- interrupts : should contain eSPI interrupt, the device has one interrupt.
- fsl,espi-num-chipselects : the number of the chipselect signals.
+Optional properties:
+- fsl,csbef: chip select assertion time in bits before frame starts
+- fsl,csaft: chip select negation time in bits after frame ends
+
Example:
spi@110000 {
#address-cells = <1>;
interrupts = <53 0x2>;
interrupt-parent = <&mpic>;
fsl,espi-num-chipselects = <4>;
+ fsl,csbef = <1>;
+ fsl,csaft = <1>;
};
chip select active high
- spi-3wire - (optional) Empty property indicating device requires
3-wire mode.
+- spi-lsb-first - (optional) Empty property indicating device requires
+ LSB first mode.
- spi-tx-bus-width - (optional) The bus width(number of data wires) that
used for MOSI. Defaults to 1 if not present.
- spi-rx-bus-width - (optional) The bus width(number of data wires) that
--- /dev/null
+Cadence SPI controller Device Tree Bindings
+-------------------------------------------
+
+Required properties:
+- compatible : Should be "cdns,spi-r1p6" or "xlnx,zynq-spi-r1p6".
+- reg : Physical base address and size of SPI registers map.
+- interrupts : Property with a value describing the interrupt
+ number.
+- interrupt-parent : Must be core interrupt controller
+- clock-names : List of input clock names - "ref_clk", "pclk"
+ (See clock bindings for details).
+- clocks : Clock phandles (see clock bindings for details).
+
+Optional properties:
+- num-cs : Number of chip selects used.
+ If a decoder is used, this will be the number of
+ chip selects after the decoder.
+- is-decoded-cs : Flag to indicate whether decoder is used or not.
+
+Example:
+
+ spi@e0007000 {
+ compatible = "xlnx,zynq-spi-r1p6";
+ clock-names = "ref_clk", "pclk";
+ clocks = <&clkc 26>, <&clkc 35>;
+ interrupt-parent = <&intc>;
+ interrupts = <0 49 4>;
+ num-cs = <4>;
+ is-decoded-cs = <0>;
+ reg = <0xe0007000 0x1000>;
+ } ;
--- /dev/null
+Synopsys DesignWare SPI master
+
+Required properties:
+- compatible: should be "snps,designware-spi"
+- #address-cells: see spi-bus.txt
+- #size-cells: see spi-bus.txt
+- reg: address and length of the spi master registers
+- interrupts: should contain one interrupt
+- clocks: spi clock phandle
+- num-cs: see spi-bus.txt
+
+Optional properties:
+- cs-gpios: see spi-bus.txt
+
+Example:
+
+spi: spi@4020a000 {
+ compatible = "snps,designware-spi";
+ interrupts = <11 1>;
+ reg = <0x4020a000 0x1000>;
+ clocks = <&pclk>;
+ num-cs = <2>;
+ cs-gpios = <&banka 0 0>;
+};
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/platform_data/pinctrl-adi2.h>
-#include <asm/bfin_spi3.h>
+#include <linux/spi/adi_spi3.h>
#include <asm/dma.h>
#include <asm/gpio.h>
#include <asm/nand.h>
.type = "w25q32",
};
-static struct bfin_spi3_chip spi_flash_chip_info = {
+static struct adi_spi3_chip spi_flash_chip_info = {
.enable_dma = true, /* use dma transfer with this chip*/
};
#endif
#if IS_ENABLED(CONFIG_SPI_SPIDEV)
-static struct bfin_spi3_chip spidev_chip_info = {
+static struct adi_spi3_chip spidev_chip_info = {
.enable_dma = true,
};
#endif
},
#endif
};
-#if IS_ENABLED(CONFIG_SPI_BFIN_V3)
+#if IS_ENABLED(CONFIG_SPI_ADI_V3)
/* SPI (0) */
static struct resource bfin_spi0_resource[] = {
{
};
/* SPI controller data */
-static struct bfin_spi3_master bf60x_spi_master_info0 = {
+static struct adi_spi3_master bf60x_spi_master_info0 = {
.num_chipselect = MAX_CTRL_CS + MAX_BLACKFIN_GPIOS,
.pin_req = {P_SPI0_SCK, P_SPI0_MISO, P_SPI0_MOSI, 0},
};
static struct platform_device bf60x_spi_master0 = {
- .name = "bfin-spi3",
+ .name = "adi-spi3",
.id = 0, /* Bus number */
.num_resources = ARRAY_SIZE(bfin_spi0_resource),
.resource = bfin_spi0_resource,
},
};
-static struct bfin_spi3_master bf60x_spi_master_info1 = {
+static struct adi_spi3_master bf60x_spi_master_info1 = {
.num_chipselect = MAX_CTRL_CS + MAX_BLACKFIN_GPIOS,
.pin_req = {P_SPI1_SCK, P_SPI1_MISO, P_SPI1_MOSI, 0},
};
static struct platform_device bf60x_spi_master1 = {
- .name = "bfin-spi3",
+ .name = "adi-spi3",
.id = 1, /* Bus number */
.num_resources = ARRAY_SIZE(bfin_spi1_resource),
.resource = bfin_spi1_resource,
&bfin_sdh_device,
#endif
-#if IS_ENABLED(CONFIG_SPI_BFIN_V3)
+#if IS_ENABLED(CONFIG_SPI_ADI_V3)
&bf60x_spi_master0,
&bf60x_spi_master1,
#endif
PIN_MAP_MUX_GROUP_DEFAULT("bfin_sir.1", "pinctrl-adi2.0", NULL, "uart1"),
PIN_MAP_MUX_GROUP_DEFAULT("bfin-sdh.0", "pinctrl-adi2.0", NULL, "rsi0"),
PIN_MAP_MUX_GROUP_DEFAULT("stmmaceth.0", "pinctrl-adi2.0", NULL, "eth0"),
- PIN_MAP_MUX_GROUP_DEFAULT("bfin-spi3.0", "pinctrl-adi2.0", NULL, "spi0"),
- PIN_MAP_MUX_GROUP_DEFAULT("bfin-spi3.1", "pinctrl-adi2.0", NULL, "spi1"),
+ PIN_MAP_MUX_GROUP_DEFAULT("adi-spi3.0", "pinctrl-adi2.0", NULL, "spi0"),
+ PIN_MAP_MUX_GROUP_DEFAULT("adi-spi3.1", "pinctrl-adi2.0", NULL, "spi1"),
PIN_MAP_MUX_GROUP_DEFAULT("i2c-bfin-twi.0", "pinctrl-adi2.0", NULL, "twi0"),
PIN_MAP_MUX_GROUP_DEFAULT("i2c-bfin-twi.1", "pinctrl-adi2.0", NULL, "twi1"),
PIN_MAP_MUX_GROUP_DEFAULT("bfin-rotary", "pinctrl-adi2.0", NULL, "rotary"),
.ops = &dummy_clk_ops,
};
+static struct clk spiclk = {
+ .name = "spi",
+ .parent = &sclk1,
+ .ops = &dummy_clk_ops,
+};
+
static struct clk_lookup bf609_clks[] = {
CLK(sys_clkin, NULL, "SYS_CLKIN"),
CLK(pll_clk, NULL, "PLLCLK"),
CLK(dclk, NULL, "DCLK"),
CLK(oclk, NULL, "OCLK"),
CLK(ethclk, NULL, "stmmaceth"),
+ CLK(spiclk, NULL, "spi"),
};
int __init clk_init(void)
help
This is the SPI controller master driver for Blackfin 5xx processor.
-config SPI_BFIN_V3
- tristate "SPI controller v3 for Blackfin"
+config SPI_ADI_V3
+ tristate "SPI controller v3 for ADI"
depends on BF60x
help
This is the SPI controller v3 master driver
inexpensive battery powered microcontroller evaluation board.
This same cable can be used to flash new firmware.
+config SPI_CADENCE
+ tristate "Cadence SPI controller"
+ depends on ARM
+ help
+ This selects the Cadence SPI controller master driver
+ used by Xilinx Zynq.
+
config SPI_CLPS711X
tristate "CLPS711X host SPI controller"
depends on ARCH_CLPS711X || COMPILE_TEST
config SPI_TOPCLIFF_PCH
tristate "Intel EG20T PCH/LAPIS Semicon IOH(ML7213/ML7223/ML7831) SPI"
- depends on PCI
+ depends on PCI && (X86_32 || COMPILE_TEST)
help
SPI driver for the Topcliff PCH (Platform Controller Hub) SPI bus
used in some x86 embedded processors.
obj-$(CONFIG_SPI_BCM63XX) += spi-bcm63xx.o
obj-$(CONFIG_SPI_BCM63XX_HSSPI) += spi-bcm63xx-hsspi.o
obj-$(CONFIG_SPI_BFIN5XX) += spi-bfin5xx.o
-obj-$(CONFIG_SPI_BFIN_V3) += spi-bfin-v3.o
+obj-$(CONFIG_SPI_ADI_V3) += spi-adi-v3.o
obj-$(CONFIG_SPI_BFIN_SPORT) += spi-bfin-sport.o
obj-$(CONFIG_SPI_BITBANG) += spi-bitbang.o
obj-$(CONFIG_SPI_BUTTERFLY) += spi-butterfly.o
+obj-$(CONFIG_SPI_CADENCE) += spi-cadence.o
obj-$(CONFIG_SPI_CLPS711X) += spi-clps711x.o
obj-$(CONFIG_SPI_COLDFIRE_QSPI) += spi-coldfire-qspi.o
obj-$(CONFIG_SPI_DAVINCI) += spi-davinci.o
/*
* Analog Devices SPI3 controller driver
*
- * Copyright (c) 2013 Analog Devices Inc.
+ * Copyright (c) 2014 Analog Devices Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* GNU General Public License for more details.
*/
+#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
+#include <linux/spi/adi_spi3.h>
#include <linux/types.h>
-#include <asm/bfin_spi3.h>
-#include <asm/cacheflush.h>
#include <asm/dma.h>
#include <asm/portmux.h>
-enum bfin_spi_state {
+enum adi_spi_state {
START_STATE,
RUNNING_STATE,
DONE_STATE,
ERROR_STATE
};
-struct bfin_spi_master;
+struct adi_spi_master;
-struct bfin_spi_transfer_ops {
- void (*write) (struct bfin_spi_master *);
- void (*read) (struct bfin_spi_master *);
- void (*duplex) (struct bfin_spi_master *);
+struct adi_spi_transfer_ops {
+ void (*write) (struct adi_spi_master *);
+ void (*read) (struct adi_spi_master *);
+ void (*duplex) (struct adi_spi_master *);
};
/* runtime info for spi master */
-struct bfin_spi_master {
+struct adi_spi_master {
/* SPI framework hookup */
struct spi_master *master;
/* Regs base of SPI controller */
- struct bfin_spi_regs __iomem *regs;
+ struct adi_spi_regs __iomem *regs;
/* Pin request list */
u16 *pin_req;
/* Current message transfer state info */
struct spi_message *cur_msg;
struct spi_transfer *cur_transfer;
- struct bfin_spi_device *cur_chip;
+ struct adi_spi_device *cur_chip;
unsigned transfer_len;
/* transfer buffer */
u32 ssel;
unsigned long sclk;
- enum bfin_spi_state state;
+ enum adi_spi_state state;
- const struct bfin_spi_transfer_ops *ops;
+ const struct adi_spi_transfer_ops *ops;
};
-struct bfin_spi_device {
+struct adi_spi_device {
u32 control;
u32 clock;
u32 ssel;
u32 cs_gpio;
u32 tx_dummy_val; /* tx value for rx only transfer */
bool enable_dma;
- const struct bfin_spi_transfer_ops *ops;
+ const struct adi_spi_transfer_ops *ops;
};
-static void bfin_spi_enable(struct bfin_spi_master *drv_data)
+static void adi_spi_enable(struct adi_spi_master *drv_data)
{
- bfin_write_or(&drv_data->regs->control, SPI_CTL_EN);
+ u32 ctl;
+
+ ctl = ioread32(&drv_data->regs->control);
+ ctl |= SPI_CTL_EN;
+ iowrite32(ctl, &drv_data->regs->control);
}
-static void bfin_spi_disable(struct bfin_spi_master *drv_data)
+static void adi_spi_disable(struct adi_spi_master *drv_data)
{
- bfin_write_and(&drv_data->regs->control, ~SPI_CTL_EN);
+ u32 ctl;
+
+ ctl = ioread32(&drv_data->regs->control);
+ ctl &= ~SPI_CTL_EN;
+ iowrite32(ctl, &drv_data->regs->control);
}
/* Caculate the SPI_CLOCK register value based on input HZ */
return spi_clock;
}
-static int bfin_spi_flush(struct bfin_spi_master *drv_data)
+static int adi_spi_flush(struct adi_spi_master *drv_data)
{
unsigned long limit = loops_per_jiffy << 1;
/* wait for stop and clear stat */
- while (!(bfin_read(&drv_data->regs->status) & SPI_STAT_SPIF) && --limit)
+ while (!(ioread32(&drv_data->regs->status) & SPI_STAT_SPIF) && --limit)
cpu_relax();
- bfin_write(&drv_data->regs->status, 0xFFFFFFFF);
+ iowrite32(0xFFFFFFFF, &drv_data->regs->status);
return limit;
}
/* Chip select operation functions for cs_change flag */
-static void bfin_spi_cs_active(struct bfin_spi_master *drv_data, struct bfin_spi_device *chip)
+static void adi_spi_cs_active(struct adi_spi_master *drv_data, struct adi_spi_device *chip)
{
- if (likely(chip->cs < MAX_CTRL_CS))
- bfin_write_and(&drv_data->regs->ssel, ~chip->ssel);
- else
+ if (likely(chip->cs < MAX_CTRL_CS)) {
+ u32 reg;
+ reg = ioread32(&drv_data->regs->ssel);
+ reg &= ~chip->ssel;
+ iowrite32(reg, &drv_data->regs->ssel);
+ } else {
gpio_set_value(chip->cs_gpio, 0);
+ }
}
-static void bfin_spi_cs_deactive(struct bfin_spi_master *drv_data,
- struct bfin_spi_device *chip)
+static void adi_spi_cs_deactive(struct adi_spi_master *drv_data,
+ struct adi_spi_device *chip)
{
- if (likely(chip->cs < MAX_CTRL_CS))
- bfin_write_or(&drv_data->regs->ssel, chip->ssel);
- else
+ if (likely(chip->cs < MAX_CTRL_CS)) {
+ u32 reg;
+ reg = ioread32(&drv_data->regs->ssel);
+ reg |= chip->ssel;
+ iowrite32(reg, &drv_data->regs->ssel);
+ } else {
gpio_set_value(chip->cs_gpio, 1);
+ }
/* Move delay here for consistency */
if (chip->cs_chg_udelay)
}
/* enable or disable the pin muxed by GPIO and SPI CS to work as SPI CS */
-static inline void bfin_spi_cs_enable(struct bfin_spi_master *drv_data,
- struct bfin_spi_device *chip)
+static inline void adi_spi_cs_enable(struct adi_spi_master *drv_data,
+ struct adi_spi_device *chip)
{
- if (chip->cs < MAX_CTRL_CS)
- bfin_write_or(&drv_data->regs->ssel, chip->ssel >> 8);
+ if (chip->cs < MAX_CTRL_CS) {
+ u32 reg;
+ reg = ioread32(&drv_data->regs->ssel);
+ reg |= chip->ssel >> 8;
+ iowrite32(reg, &drv_data->regs->ssel);
+ }
}
-static inline void bfin_spi_cs_disable(struct bfin_spi_master *drv_data,
- struct bfin_spi_device *chip)
+static inline void adi_spi_cs_disable(struct adi_spi_master *drv_data,
+ struct adi_spi_device *chip)
{
- if (chip->cs < MAX_CTRL_CS)
- bfin_write_and(&drv_data->regs->ssel, ~(chip->ssel >> 8));
+ if (chip->cs < MAX_CTRL_CS) {
+ u32 reg;
+ reg = ioread32(&drv_data->regs->ssel);
+ reg &= ~(chip->ssel >> 8);
+ iowrite32(reg, &drv_data->regs->ssel);
+ }
}
/* stop controller and re-config current chip*/
-static void bfin_spi_restore_state(struct bfin_spi_master *drv_data)
+static void adi_spi_restore_state(struct adi_spi_master *drv_data)
{
- struct bfin_spi_device *chip = drv_data->cur_chip;
+ struct adi_spi_device *chip = drv_data->cur_chip;
/* Clear status and disable clock */
- bfin_write(&drv_data->regs->status, 0xFFFFFFFF);
- bfin_write(&drv_data->regs->rx_control, 0x0);
- bfin_write(&drv_data->regs->tx_control, 0x0);
- bfin_spi_disable(drv_data);
-
- SSYNC();
+ iowrite32(0xFFFFFFFF, &drv_data->regs->status);
+ iowrite32(0x0, &drv_data->regs->rx_control);
+ iowrite32(0x0, &drv_data->regs->tx_control);
+ adi_spi_disable(drv_data);
/* Load the registers */
- bfin_write(&drv_data->regs->control, chip->control);
- bfin_write(&drv_data->regs->clock, chip->clock);
+ iowrite32(chip->control, &drv_data->regs->control);
+ iowrite32(chip->clock, &drv_data->regs->clock);
- bfin_spi_enable(drv_data);
+ adi_spi_enable(drv_data);
drv_data->tx_num = drv_data->rx_num = 0;
/* we always choose tx transfer initiate */
- bfin_write(&drv_data->regs->rx_control, SPI_RXCTL_REN);
- bfin_write(&drv_data->regs->tx_control,
- SPI_TXCTL_TEN | SPI_TXCTL_TTI);
- bfin_spi_cs_active(drv_data, chip);
+ iowrite32(SPI_RXCTL_REN, &drv_data->regs->rx_control);
+ iowrite32(SPI_TXCTL_TEN | SPI_TXCTL_TTI, &drv_data->regs->tx_control);
+ adi_spi_cs_active(drv_data, chip);
}
/* discard invalid rx data and empty rfifo */
-static inline void dummy_read(struct bfin_spi_master *drv_data)
+static inline void dummy_read(struct adi_spi_master *drv_data)
{
- while (!(bfin_read(&drv_data->regs->status) & SPI_STAT_RFE))
- bfin_read(&drv_data->regs->rfifo);
+ while (!(ioread32(&drv_data->regs->status) & SPI_STAT_RFE))
+ ioread32(&drv_data->regs->rfifo);
}
-static void bfin_spi_u8_write(struct bfin_spi_master *drv_data)
+static void adi_spi_u8_write(struct adi_spi_master *drv_data)
{
dummy_read(drv_data);
while (drv_data->tx < drv_data->tx_end) {
- bfin_write(&drv_data->regs->tfifo, (*(u8 *)(drv_data->tx++)));
- while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE)
+ iowrite32(*(u8 *)(drv_data->tx++), &drv_data->regs->tfifo);
+ while (ioread32(&drv_data->regs->status) & SPI_STAT_RFE)
cpu_relax();
- bfin_read(&drv_data->regs->rfifo);
+ ioread32(&drv_data->regs->rfifo);
}
}
-static void bfin_spi_u8_read(struct bfin_spi_master *drv_data)
+static void adi_spi_u8_read(struct adi_spi_master *drv_data)
{
u32 tx_val = drv_data->cur_chip->tx_dummy_val;
dummy_read(drv_data);
while (drv_data->rx < drv_data->rx_end) {
- bfin_write(&drv_data->regs->tfifo, tx_val);
- while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE)
+ iowrite32(tx_val, &drv_data->regs->tfifo);
+ while (ioread32(&drv_data->regs->status) & SPI_STAT_RFE)
cpu_relax();
- *(u8 *)(drv_data->rx++) = bfin_read(&drv_data->regs->rfifo);
+ *(u8 *)(drv_data->rx++) = ioread32(&drv_data->regs->rfifo);
}
}
-static void bfin_spi_u8_duplex(struct bfin_spi_master *drv_data)
+static void adi_spi_u8_duplex(struct adi_spi_master *drv_data)
{
dummy_read(drv_data);
while (drv_data->rx < drv_data->rx_end) {
- bfin_write(&drv_data->regs->tfifo, (*(u8 *)(drv_data->tx++)));
- while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE)
+ iowrite32(*(u8 *)(drv_data->tx++), &drv_data->regs->tfifo);
+ while (ioread32(&drv_data->regs->status) & SPI_STAT_RFE)
cpu_relax();
- *(u8 *)(drv_data->rx++) = bfin_read(&drv_data->regs->rfifo);
+ *(u8 *)(drv_data->rx++) = ioread32(&drv_data->regs->rfifo);
}
}
-static const struct bfin_spi_transfer_ops bfin_bfin_spi_transfer_ops_u8 = {
- .write = bfin_spi_u8_write,
- .read = bfin_spi_u8_read,
- .duplex = bfin_spi_u8_duplex,
+static const struct adi_spi_transfer_ops adi_spi_transfer_ops_u8 = {
+ .write = adi_spi_u8_write,
+ .read = adi_spi_u8_read,
+ .duplex = adi_spi_u8_duplex,
};
-static void bfin_spi_u16_write(struct bfin_spi_master *drv_data)
+static void adi_spi_u16_write(struct adi_spi_master *drv_data)
{
dummy_read(drv_data);
while (drv_data->tx < drv_data->tx_end) {
- bfin_write(&drv_data->regs->tfifo, (*(u16 *)drv_data->tx));
+ iowrite32(*(u16 *)drv_data->tx, &drv_data->regs->tfifo);
drv_data->tx += 2;
- while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE)
+ while (ioread32(&drv_data->regs->status) & SPI_STAT_RFE)
cpu_relax();
- bfin_read(&drv_data->regs->rfifo);
+ ioread32(&drv_data->regs->rfifo);
}
}
-static void bfin_spi_u16_read(struct bfin_spi_master *drv_data)
+static void adi_spi_u16_read(struct adi_spi_master *drv_data)
{
u32 tx_val = drv_data->cur_chip->tx_dummy_val;
dummy_read(drv_data);
while (drv_data->rx < drv_data->rx_end) {
- bfin_write(&drv_data->regs->tfifo, tx_val);
- while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE)
+ iowrite32(tx_val, &drv_data->regs->tfifo);
+ while (ioread32(&drv_data->regs->status) & SPI_STAT_RFE)
cpu_relax();
- *(u16 *)drv_data->rx = bfin_read(&drv_data->regs->rfifo);
+ *(u16 *)drv_data->rx = ioread32(&drv_data->regs->rfifo);
drv_data->rx += 2;
}
}
-static void bfin_spi_u16_duplex(struct bfin_spi_master *drv_data)
+static void adi_spi_u16_duplex(struct adi_spi_master *drv_data)
{
dummy_read(drv_data);
while (drv_data->rx < drv_data->rx_end) {
- bfin_write(&drv_data->regs->tfifo, (*(u16 *)drv_data->tx));
+ iowrite32(*(u16 *)drv_data->tx, &drv_data->regs->tfifo);
drv_data->tx += 2;
- while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE)
+ while (ioread32(&drv_data->regs->status) & SPI_STAT_RFE)
cpu_relax();
- *(u16 *)drv_data->rx = bfin_read(&drv_data->regs->rfifo);
+ *(u16 *)drv_data->rx = ioread32(&drv_data->regs->rfifo);
drv_data->rx += 2;
}
}
-static const struct bfin_spi_transfer_ops bfin_bfin_spi_transfer_ops_u16 = {
- .write = bfin_spi_u16_write,
- .read = bfin_spi_u16_read,
- .duplex = bfin_spi_u16_duplex,
+static const struct adi_spi_transfer_ops adi_spi_transfer_ops_u16 = {
+ .write = adi_spi_u16_write,
+ .read = adi_spi_u16_read,
+ .duplex = adi_spi_u16_duplex,
};
-static void bfin_spi_u32_write(struct bfin_spi_master *drv_data)
+static void adi_spi_u32_write(struct adi_spi_master *drv_data)
{
dummy_read(drv_data);
while (drv_data->tx < drv_data->tx_end) {
- bfin_write(&drv_data->regs->tfifo, (*(u32 *)drv_data->tx));
+ iowrite32(*(u32 *)drv_data->tx, &drv_data->regs->tfifo);
drv_data->tx += 4;
- while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE)
+ while (ioread32(&drv_data->regs->status) & SPI_STAT_RFE)
cpu_relax();
- bfin_read(&drv_data->regs->rfifo);
+ ioread32(&drv_data->regs->rfifo);
}
}
-static void bfin_spi_u32_read(struct bfin_spi_master *drv_data)
+static void adi_spi_u32_read(struct adi_spi_master *drv_data)
{
u32 tx_val = drv_data->cur_chip->tx_dummy_val;
dummy_read(drv_data);
while (drv_data->rx < drv_data->rx_end) {
- bfin_write(&drv_data->regs->tfifo, tx_val);
- while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE)
+ iowrite32(tx_val, &drv_data->regs->tfifo);
+ while (ioread32(&drv_data->regs->status) & SPI_STAT_RFE)
cpu_relax();
- *(u32 *)drv_data->rx = bfin_read(&drv_data->regs->rfifo);
+ *(u32 *)drv_data->rx = ioread32(&drv_data->regs->rfifo);
drv_data->rx += 4;
}
}
-static void bfin_spi_u32_duplex(struct bfin_spi_master *drv_data)
+static void adi_spi_u32_duplex(struct adi_spi_master *drv_data)
{
dummy_read(drv_data);
while (drv_data->rx < drv_data->rx_end) {
- bfin_write(&drv_data->regs->tfifo, (*(u32 *)drv_data->tx));
+ iowrite32(*(u32 *)drv_data->tx, &drv_data->regs->tfifo);
drv_data->tx += 4;
- while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE)
+ while (ioread32(&drv_data->regs->status) & SPI_STAT_RFE)
cpu_relax();
- *(u32 *)drv_data->rx = bfin_read(&drv_data->regs->rfifo);
+ *(u32 *)drv_data->rx = ioread32(&drv_data->regs->rfifo);
drv_data->rx += 4;
}
}
-static const struct bfin_spi_transfer_ops bfin_bfin_spi_transfer_ops_u32 = {
- .write = bfin_spi_u32_write,
- .read = bfin_spi_u32_read,
- .duplex = bfin_spi_u32_duplex,
+static const struct adi_spi_transfer_ops adi_spi_transfer_ops_u32 = {
+ .write = adi_spi_u32_write,
+ .read = adi_spi_u32_read,
+ .duplex = adi_spi_u32_duplex,
};
/* test if there is more transfer to be done */
-static void bfin_spi_next_transfer(struct bfin_spi_master *drv)
+static void adi_spi_next_transfer(struct adi_spi_master *drv)
{
struct spi_message *msg = drv->cur_msg;
struct spi_transfer *t = drv->cur_transfer;
}
}
-static void bfin_spi_giveback(struct bfin_spi_master *drv_data)
+static void adi_spi_giveback(struct adi_spi_master *drv_data)
{
- struct bfin_spi_device *chip = drv_data->cur_chip;
+ struct adi_spi_device *chip = drv_data->cur_chip;
- bfin_spi_cs_deactive(drv_data, chip);
+ adi_spi_cs_deactive(drv_data, chip);
spi_finalize_current_message(drv_data->master);
}
-static int bfin_spi_setup_transfer(struct bfin_spi_master *drv)
+static int adi_spi_setup_transfer(struct adi_spi_master *drv)
{
struct spi_transfer *t = drv->cur_transfer;
u32 cr, cr_width;
switch (t->bits_per_word) {
case 8:
cr_width = SPI_CTL_SIZE08;
- drv->ops = &bfin_bfin_spi_transfer_ops_u8;
+ drv->ops = &adi_spi_transfer_ops_u8;
break;
case 16:
cr_width = SPI_CTL_SIZE16;
- drv->ops = &bfin_bfin_spi_transfer_ops_u16;
+ drv->ops = &adi_spi_transfer_ops_u16;
break;
case 32:
cr_width = SPI_CTL_SIZE32;
- drv->ops = &bfin_bfin_spi_transfer_ops_u32;
+ drv->ops = &adi_spi_transfer_ops_u32;
break;
default:
return -EINVAL;
}
- cr = bfin_read(&drv->regs->control) & ~SPI_CTL_SIZE;
+ cr = ioread32(&drv->regs->control) & ~SPI_CTL_SIZE;
cr |= cr_width;
- bfin_write(&drv->regs->control, cr);
+ iowrite32(cr, &drv->regs->control);
/* speed setup */
- bfin_write(&drv->regs->clock,
- hz_to_spi_clock(drv->sclk, t->speed_hz));
+ iowrite32(hz_to_spi_clock(drv->sclk, t->speed_hz), &drv->regs->clock);
return 0;
}
-static int bfin_spi_dma_xfer(struct bfin_spi_master *drv_data)
+static int adi_spi_dma_xfer(struct adi_spi_master *drv_data)
{
struct spi_transfer *t = drv_data->cur_transfer;
struct spi_message *msg = drv_data->cur_msg;
- struct bfin_spi_device *chip = drv_data->cur_chip;
+ struct adi_spi_device *chip = drv_data->cur_chip;
u32 dma_config;
unsigned long word_count, word_size;
void *tx_buf, *rx_buf;
set_dma_config(drv_data->rx_dma, dma_config | WNR);
enable_dma(drv_data->tx_dma);
enable_dma(drv_data->rx_dma);
- SSYNC();
- bfin_write(&drv_data->regs->rx_control, SPI_RXCTL_REN | SPI_RXCTL_RDR_NE);
- SSYNC();
- bfin_write(&drv_data->regs->tx_control,
- SPI_TXCTL_TEN | SPI_TXCTL_TTI | SPI_TXCTL_TDR_NF);
+ iowrite32(SPI_RXCTL_REN | SPI_RXCTL_RDR_NE,
+ &drv_data->regs->rx_control);
+ iowrite32(SPI_TXCTL_TEN | SPI_TXCTL_TTI | SPI_TXCTL_TDR_NF,
+ &drv_data->regs->tx_control);
return 0;
}
-static int bfin_spi_pio_xfer(struct bfin_spi_master *drv_data)
+static int adi_spi_pio_xfer(struct adi_spi_master *drv_data)
{
struct spi_message *msg = drv_data->cur_msg;
return -EIO;
}
- if (!bfin_spi_flush(drv_data))
+ if (!adi_spi_flush(drv_data))
return -EIO;
msg->actual_length += drv_data->transfer_len;
tasklet_schedule(&drv_data->pump_transfers);
return 0;
}
-static void bfin_spi_pump_transfers(unsigned long data)
+static void adi_spi_pump_transfers(unsigned long data)
{
- struct bfin_spi_master *drv_data = (struct bfin_spi_master *)data;
+ struct adi_spi_master *drv_data = (struct adi_spi_master *)data;
struct spi_message *msg = NULL;
struct spi_transfer *t = NULL;
- struct bfin_spi_device *chip = NULL;
+ struct adi_spi_device *chip = NULL;
int ret;
/* Get current state information */
/* Handle for abort */
if (drv_data->state == ERROR_STATE) {
msg->status = -EIO;
- bfin_spi_giveback(drv_data);
+ adi_spi_giveback(drv_data);
return;
}
if (t->delay_usecs)
udelay(t->delay_usecs);
if (t->cs_change)
- bfin_spi_cs_deactive(drv_data, chip);
- bfin_spi_next_transfer(drv_data);
+ adi_spi_cs_deactive(drv_data, chip);
+ adi_spi_next_transfer(drv_data);
t = drv_data->cur_transfer;
}
/* Handle end of message */
if (drv_data->state == DONE_STATE) {
msg->status = 0;
- bfin_spi_giveback(drv_data);
+ adi_spi_giveback(drv_data);
return;
}
return;
}
- ret = bfin_spi_setup_transfer(drv_data);
+ ret = adi_spi_setup_transfer(drv_data);
if (ret) {
msg->status = ret;
- bfin_spi_giveback(drv_data);
+ adi_spi_giveback(drv_data);
}
- bfin_write(&drv_data->regs->status, 0xFFFFFFFF);
- bfin_spi_cs_active(drv_data, chip);
+ iowrite32(0xFFFFFFFF, &drv_data->regs->status);
+ adi_spi_cs_active(drv_data, chip);
drv_data->state = RUNNING_STATE;
if (chip->enable_dma)
- ret = bfin_spi_dma_xfer(drv_data);
+ ret = adi_spi_dma_xfer(drv_data);
else
- ret = bfin_spi_pio_xfer(drv_data);
+ ret = adi_spi_pio_xfer(drv_data);
if (ret) {
msg->status = ret;
- bfin_spi_giveback(drv_data);
+ adi_spi_giveback(drv_data);
}
}
-static int bfin_spi_transfer_one_message(struct spi_master *master,
+static int adi_spi_transfer_one_message(struct spi_master *master,
struct spi_message *m)
{
- struct bfin_spi_master *drv_data = spi_master_get_devdata(master);
+ struct adi_spi_master *drv_data = spi_master_get_devdata(master);
drv_data->cur_msg = m;
drv_data->cur_chip = spi_get_ctldata(drv_data->cur_msg->spi);
- bfin_spi_restore_state(drv_data);
+ adi_spi_restore_state(drv_data);
drv_data->state = START_STATE;
drv_data->cur_transfer = list_entry(drv_data->cur_msg->transfers.next,
P_SPI2_SSEL6, P_SPI2_SSEL7},
};
-static int bfin_spi_setup(struct spi_device *spi)
+static int adi_spi_setup(struct spi_device *spi)
{
- struct bfin_spi_master *drv_data = spi_master_get_devdata(spi->master);
- struct bfin_spi_device *chip = spi_get_ctldata(spi);
- u32 bfin_ctl_reg = SPI_CTL_ODM | SPI_CTL_PSSE;
+ struct adi_spi_master *drv_data = spi_master_get_devdata(spi->master);
+ struct adi_spi_device *chip = spi_get_ctldata(spi);
+ u32 ctl_reg = SPI_CTL_ODM | SPI_CTL_PSSE;
int ret = -EINVAL;
if (!chip) {
- struct bfin_spi3_chip *chip_info = spi->controller_data;
+ struct adi_spi3_chip *chip_info = spi->controller_data;
chip = kzalloc(sizeof(*chip), GFP_KERNEL);
if (!chip) {
return -ENOMEM;
}
if (chip_info) {
- if (chip_info->control & ~bfin_ctl_reg) {
+ if (chip_info->control & ~ctl_reg) {
dev_err(&spi->dev,
"do not set bits that the SPI framework manages\n");
goto error;
chip->enable_dma = chip_info->enable_dma;
}
chip->cs = spi->chip_select;
+
if (chip->cs < MAX_CTRL_CS) {
chip->ssel = (1 << chip->cs) << 8;
ret = peripheral_request(ssel[spi->master->bus_num]
}
/* force a default base state */
- chip->control &= bfin_ctl_reg;
+ chip->control &= ctl_reg;
if (spi->mode & SPI_CPOL)
chip->control |= SPI_CTL_CPOL;
chip->clock = hz_to_spi_clock(drv_data->sclk, spi->max_speed_hz);
- bfin_spi_cs_enable(drv_data, chip);
- bfin_spi_cs_deactive(drv_data, chip);
+ adi_spi_cs_enable(drv_data, chip);
+ adi_spi_cs_deactive(drv_data, chip);
return 0;
error:
return ret;
}
-static void bfin_spi_cleanup(struct spi_device *spi)
+static void adi_spi_cleanup(struct spi_device *spi)
{
- struct bfin_spi_device *chip = spi_get_ctldata(spi);
- struct bfin_spi_master *drv_data = spi_master_get_devdata(spi->master);
+ struct adi_spi_device *chip = spi_get_ctldata(spi);
+ struct adi_spi_master *drv_data = spi_master_get_devdata(spi->master);
if (!chip)
return;
if (chip->cs < MAX_CTRL_CS) {
peripheral_free(ssel[spi->master->bus_num]
[chip->cs-1]);
- bfin_spi_cs_disable(drv_data, chip);
+ adi_spi_cs_disable(drv_data, chip);
} else {
gpio_free(chip->cs_gpio);
}
spi_set_ctldata(spi, NULL);
}
-static irqreturn_t bfin_spi_tx_dma_isr(int irq, void *dev_id)
+static irqreturn_t adi_spi_tx_dma_isr(int irq, void *dev_id)
{
- struct bfin_spi_master *drv_data = dev_id;
+ struct adi_spi_master *drv_data = dev_id;
u32 dma_stat = get_dma_curr_irqstat(drv_data->tx_dma);
+ u32 tx_ctl;
clear_dma_irqstat(drv_data->tx_dma);
if (dma_stat & DMA_DONE) {
if (drv_data->tx)
drv_data->state = ERROR_STATE;
}
- bfin_write_and(&drv_data->regs->tx_control, ~SPI_TXCTL_TDR_NF);
+ tx_ctl = ioread32(&drv_data->regs->tx_control);
+ tx_ctl &= ~SPI_TXCTL_TDR_NF;
+ iowrite32(tx_ctl, &drv_data->regs->tx_control);
return IRQ_HANDLED;
}
-static irqreturn_t bfin_spi_rx_dma_isr(int irq, void *dev_id)
+static irqreturn_t adi_spi_rx_dma_isr(int irq, void *dev_id)
{
- struct bfin_spi_master *drv_data = dev_id;
+ struct adi_spi_master *drv_data = dev_id;
struct spi_message *msg = drv_data->cur_msg;
u32 dma_stat = get_dma_curr_irqstat(drv_data->rx_dma);
dev_err(&drv_data->master->dev,
"spi rx dma error: %d\n", dma_stat);
}
- bfin_write(&drv_data->regs->tx_control, 0);
- bfin_write(&drv_data->regs->rx_control, 0);
+ iowrite32(0, &drv_data->regs->tx_control);
+ iowrite32(0, &drv_data->regs->rx_control);
if (drv_data->rx_num != drv_data->tx_num)
dev_dbg(&drv_data->master->dev,
"dma interrupt missing: tx=%d,rx=%d\n",
return IRQ_HANDLED;
}
-static int bfin_spi_probe(struct platform_device *pdev)
+static int adi_spi_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
- struct bfin_spi3_master *info = dev_get_platdata(dev);
+ struct adi_spi3_master *info = dev_get_platdata(dev);
struct spi_master *master;
- struct bfin_spi_master *drv_data;
+ struct adi_spi_master *drv_data;
struct resource *mem, *res;
unsigned int tx_dma, rx_dma;
- unsigned long sclk;
+ struct clk *sclk;
int ret;
if (!info) {
return -ENODEV;
}
- sclk = get_sclk1();
- if (!sclk) {
- dev_err(dev, "can not get sclk1\n");
- return -ENXIO;
+ sclk = devm_clk_get(dev, "spi");
+ if (IS_ERR(sclk)) {
+ dev_err(dev, "can not get spi clock\n");
+ return PTR_ERR(sclk);
}
res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
master->bus_num = pdev->id;
master->num_chipselect = info->num_chipselect;
- master->cleanup = bfin_spi_cleanup;
- master->setup = bfin_spi_setup;
- master->transfer_one_message = bfin_spi_transfer_one_message;
+ master->cleanup = adi_spi_cleanup;
+ master->setup = adi_spi_setup;
+ master->transfer_one_message = adi_spi_transfer_one_message;
master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(16) |
SPI_BPW_MASK(8);
drv_data->tx_dma = tx_dma;
drv_data->rx_dma = rx_dma;
drv_data->pin_req = info->pin_req;
- drv_data->sclk = sclk;
+ drv_data->sclk = clk_get_rate(sclk);
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
drv_data->regs = devm_ioremap_resource(dev, mem);
dev_err(dev, "can not request SPI TX DMA channel\n");
goto err_put_master;
}
- set_dma_callback(tx_dma, bfin_spi_tx_dma_isr, drv_data);
+ set_dma_callback(tx_dma, adi_spi_tx_dma_isr, drv_data);
ret = request_dma(rx_dma, "SPI_RX_DMA");
if (ret) {
dev_err(dev, "can not request SPI RX DMA channel\n");
goto err_free_tx_dma;
}
- set_dma_callback(drv_data->rx_dma, bfin_spi_rx_dma_isr, drv_data);
+ set_dma_callback(drv_data->rx_dma, adi_spi_rx_dma_isr, drv_data);
/* request CLK, MOSI and MISO */
- ret = peripheral_request_list(drv_data->pin_req, "bfin-spi3");
+ ret = peripheral_request_list(drv_data->pin_req, "adi-spi3");
if (ret < 0) {
dev_err(dev, "can not request spi pins\n");
goto err_free_rx_dma;
}
- bfin_write(&drv_data->regs->control, SPI_CTL_MSTR | SPI_CTL_CPHA);
- bfin_write(&drv_data->regs->ssel, 0x0000FE00);
- bfin_write(&drv_data->regs->delay, 0x0);
+ iowrite32(SPI_CTL_MSTR | SPI_CTL_CPHA, &drv_data->regs->control);
+ iowrite32(0x0000FE00, &drv_data->regs->ssel);
+ iowrite32(0x0, &drv_data->regs->delay);
tasklet_init(&drv_data->pump_transfers,
- bfin_spi_pump_transfers, (unsigned long)drv_data);
+ adi_spi_pump_transfers, (unsigned long)drv_data);
/* register with the SPI framework */
ret = devm_spi_register_master(dev, master);
if (ret) {
return ret;
}
-static int bfin_spi_remove(struct platform_device *pdev)
+static int adi_spi_remove(struct platform_device *pdev)
{
struct spi_master *master = platform_get_drvdata(pdev);
- struct bfin_spi_master *drv_data = spi_master_get_devdata(master);
-
- bfin_spi_disable(drv_data);
+ struct adi_spi_master *drv_data = spi_master_get_devdata(master);
+ adi_spi_disable(drv_data);
peripheral_free_list(drv_data->pin_req);
free_dma(drv_data->rx_dma);
free_dma(drv_data->tx_dma);
-
return 0;
}
#ifdef CONFIG_PM
-static int bfin_spi_suspend(struct device *dev)
+static int adi_spi_suspend(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
- struct bfin_spi_master *drv_data = spi_master_get_devdata(master);
+ struct adi_spi_master *drv_data = spi_master_get_devdata(master);
spi_master_suspend(master);
- drv_data->control = bfin_read(&drv_data->regs->control);
- drv_data->ssel = bfin_read(&drv_data->regs->ssel);
+ drv_data->control = ioread32(&drv_data->regs->control);
+ drv_data->ssel = ioread32(&drv_data->regs->ssel);
- bfin_write(&drv_data->regs->control, SPI_CTL_MSTR | SPI_CTL_CPHA);
- bfin_write(&drv_data->regs->ssel, 0x0000FE00);
+ iowrite32(SPI_CTL_MSTR | SPI_CTL_CPHA, &drv_data->regs->control);
+ iowrite32(0x0000FE00, &drv_data->regs->ssel);
dma_disable_irq(drv_data->rx_dma);
dma_disable_irq(drv_data->tx_dma);
return 0;
}
-static int bfin_spi_resume(struct device *dev)
+static int adi_spi_resume(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
- struct bfin_spi_master *drv_data = spi_master_get_devdata(master);
+ struct adi_spi_master *drv_data = spi_master_get_devdata(master);
int ret = 0;
/* bootrom may modify spi and dma status when resume in spi boot mode */
dma_enable_irq(drv_data->rx_dma);
dma_enable_irq(drv_data->tx_dma);
- bfin_write(&drv_data->regs->control, drv_data->control);
- bfin_write(&drv_data->regs->ssel, drv_data->ssel);
+ iowrite32(drv_data->control, &drv_data->regs->control);
+ iowrite32(drv_data->ssel, &drv_data->regs->ssel);
ret = spi_master_resume(master);
if (ret) {
return ret;
}
#endif
-static const struct dev_pm_ops bfin_spi_pm_ops = {
- SET_SYSTEM_SLEEP_PM_OPS(bfin_spi_suspend, bfin_spi_resume)
+static const struct dev_pm_ops adi_spi_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(adi_spi_suspend, adi_spi_resume)
};
-MODULE_ALIAS("platform:bfin-spi3");
-static struct platform_driver bfin_spi_driver = {
+MODULE_ALIAS("platform:adi-spi3");
+static struct platform_driver adi_spi_driver = {
.driver = {
- .name = "bfin-spi3",
+ .name = "adi-spi3",
.owner = THIS_MODULE,
- .pm = &bfin_spi_pm_ops,
+ .pm = &adi_spi_pm_ops,
},
- .remove = bfin_spi_remove,
+ .remove = adi_spi_remove,
};
-module_platform_driver_probe(bfin_spi_driver, bfin_spi_probe);
+module_platform_driver_probe(adi_spi_driver, adi_spi_probe);
MODULE_DESCRIPTION("Analog Devices SPI3 controller driver");
MODULE_AUTHOR("Scott Jiang <Scott.Jiang.Linux@gmail.com>");
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
-#include <linux/workqueue.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/spi/spi.h>
struct platform_device *pdev;
struct spi_transfer *current_transfer;
- unsigned long current_remaining_bytes;
+ int current_remaining_bytes;
int done_status;
struct completion xfer_completion;
spi_readl(as, RDR);
}
if (xfer->bits_per_word > 8) {
- as->current_remaining_bytes -= 2;
- if (as->current_remaining_bytes < 0)
+ if (as->current_remaining_bytes > 2)
+ as->current_remaining_bytes -= 2;
+ else
as->current_remaining_bytes = 0;
} else {
as->current_remaining_bytes--;
atmel_spi_next_xfer_pio(master, xfer);
} else {
as->current_remaining_bytes -= len;
+ if (as->current_remaining_bytes < 0)
+ as->current_remaining_bytes = 0;
}
} else {
atmel_spi_next_xfer_pio(master, xfer);
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/spi/spi.h>
-#include <linux/workqueue.h>
#include <linux/mutex.h>
#define HSSPI_GLOBAL_CTRL_REG 0x0
#include <linux/spi/spi.h>
#include <linux/completion.h>
#include <linux/err.h>
-#include <linux/workqueue.h>
#include <linux/pm_runtime.h>
#include <bcm63xx_dev_spi.h>
--- /dev/null
+/*
+ * Cadence SPI controller driver (master mode only)
+ *
+ * Copyright (C) 2008 - 2014 Xilinx, Inc.
+ *
+ * based on Blackfin On-Chip SPI Driver (spi_bfin5xx.c)
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License version 2 as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/spi/spi.h>
+
+/* Name of this driver */
+#define CDNS_SPI_NAME "cdns-spi"
+
+/* Register offset definitions */
+#define CDNS_SPI_CR_OFFSET 0x00 /* Configuration Register, RW */
+#define CDNS_SPI_ISR_OFFSET 0x04 /* Interrupt Status Register, RO */
+#define CDNS_SPI_IER_OFFSET 0x08 /* Interrupt Enable Register, WO */
+#define CDNS_SPI_IDR_OFFSET 0x0c /* Interrupt Disable Register, WO */
+#define CDNS_SPI_IMR_OFFSET 0x10 /* Interrupt Enabled Mask Register, RO */
+#define CDNS_SPI_ER_OFFSET 0x14 /* Enable/Disable Register, RW */
+#define CDNS_SPI_DR_OFFSET 0x18 /* Delay Register, RW */
+#define CDNS_SPI_TXD_OFFSET 0x1C /* Data Transmit Register, WO */
+#define CDNS_SPI_RXD_OFFSET 0x20 /* Data Receive Register, RO */
+#define CDNS_SPI_SICR_OFFSET 0x24 /* Slave Idle Count Register, RW */
+#define CDNS_SPI_THLD_OFFSET 0x28 /* Transmit FIFO Watermark Register,RW */
+
+/*
+ * SPI Configuration Register bit Masks
+ *
+ * This register contains various control bits that affect the operation
+ * of the SPI controller
+ */
+#define CDNS_SPI_CR_MANSTRT_MASK 0x00010000 /* Manual TX Start */
+#define CDNS_SPI_CR_CPHA_MASK 0x00000004 /* Clock Phase Control */
+#define CDNS_SPI_CR_CPOL_MASK 0x00000002 /* Clock Polarity Control */
+#define CDNS_SPI_CR_SSCTRL_MASK 0x00003C00 /* Slave Select Mask */
+#define CDNS_SPI_CR_BAUD_DIV_MASK 0x00000038 /* Baud Rate Divisor Mask */
+#define CDNS_SPI_CR_MSTREN_MASK 0x00000001 /* Master Enable Mask */
+#define CDNS_SPI_CR_MANSTRTEN_MASK 0x00008000 /* Manual TX Enable Mask */
+#define CDNS_SPI_CR_SSFORCE_MASK 0x00004000 /* Manual SS Enable Mask */
+#define CDNS_SPI_CR_BAUD_DIV_4_MASK 0x00000008 /* Default Baud Div Mask */
+#define CDNS_SPI_CR_DEFAULT_MASK (CDNS_SPI_CR_MSTREN_MASK | \
+ CDNS_SPI_CR_SSCTRL_MASK | \
+ CDNS_SPI_CR_SSFORCE_MASK | \
+ CDNS_SPI_CR_BAUD_DIV_4_MASK)
+
+/*
+ * SPI Configuration Register - Baud rate and slave select
+ *
+ * These are the values used in the calculation of baud rate divisor and
+ * setting the slave select.
+ */
+
+#define CDNS_SPI_BAUD_DIV_MAX 7 /* Baud rate divisor maximum */
+#define CDNS_SPI_BAUD_DIV_MIN 1 /* Baud rate divisor minimum */
+#define CDNS_SPI_BAUD_DIV_SHIFT 3 /* Baud rate divisor shift in CR */
+#define CDNS_SPI_SS_SHIFT 10 /* Slave Select field shift in CR */
+#define CDNS_SPI_SS0 0x1 /* Slave Select zero */
+
+/*
+ * SPI Interrupt Registers bit Masks
+ *
+ * All the four interrupt registers (Status/Mask/Enable/Disable) have the same
+ * bit definitions.
+ */
+#define CDNS_SPI_IXR_TXOW_MASK 0x00000004 /* SPI TX FIFO Overwater */
+#define CDNS_SPI_IXR_MODF_MASK 0x00000002 /* SPI Mode Fault */
+#define CDNS_SPI_IXR_RXNEMTY_MASK 0x00000010 /* SPI RX FIFO Not Empty */
+#define CDNS_SPI_IXR_DEFAULT_MASK (CDNS_SPI_IXR_TXOW_MASK | \
+ CDNS_SPI_IXR_MODF_MASK)
+#define CDNS_SPI_IXR_TXFULL_MASK 0x00000008 /* SPI TX Full */
+#define CDNS_SPI_IXR_ALL_MASK 0x0000007F /* SPI all interrupts */
+
+/*
+ * SPI Enable Register bit Masks
+ *
+ * This register is used to enable or disable the SPI controller
+ */
+#define CDNS_SPI_ER_ENABLE_MASK 0x00000001 /* SPI Enable Bit Mask */
+#define CDNS_SPI_ER_DISABLE_MASK 0x0 /* SPI Disable Bit Mask */
+
+/* SPI FIFO depth in bytes */
+#define CDNS_SPI_FIFO_DEPTH 128
+
+/* Default number of chip select lines */
+#define CDNS_SPI_DEFAULT_NUM_CS 4
+
+/**
+ * struct cdns_spi - This definition defines spi driver instance
+ * @regs: Virtual address of the SPI controller registers
+ * @ref_clk: Pointer to the peripheral clock
+ * @pclk: Pointer to the APB clock
+ * @speed_hz: Current SPI bus clock speed in Hz
+ * @txbuf: Pointer to the TX buffer
+ * @rxbuf: Pointer to the RX buffer
+ * @tx_bytes: Number of bytes left to transfer
+ * @rx_bytes: Number of bytes requested
+ * @dev_busy: Device busy flag
+ * @is_decoded_cs: Flag for decoder property set or not
+ */
+struct cdns_spi {
+ void __iomem *regs;
+ struct clk *ref_clk;
+ struct clk *pclk;
+ u32 speed_hz;
+ const u8 *txbuf;
+ u8 *rxbuf;
+ int tx_bytes;
+ int rx_bytes;
+ u8 dev_busy;
+ u32 is_decoded_cs;
+};
+
+/* Macros for the SPI controller read/write */
+static inline u32 cdns_spi_read(struct cdns_spi *xspi, u32 offset)
+{
+ return readl_relaxed(xspi->regs + offset);
+}
+
+static inline void cdns_spi_write(struct cdns_spi *xspi, u32 offset, u32 val)
+{
+ writel_relaxed(val, xspi->regs + offset);
+}
+
+/**
+ * cdns_spi_init_hw - Initialize the hardware and configure the SPI controller
+ * @xspi: Pointer to the cdns_spi structure
+ *
+ * On reset the SPI controller is configured to be in master mode, baud rate
+ * divisor is set to 4, threshold value for TX FIFO not full interrupt is set
+ * to 1 and size of the word to be transferred as 8 bit.
+ * This function initializes the SPI controller to disable and clear all the
+ * interrupts, enable manual slave select and manual start, deselect all the
+ * chip select lines, and enable the SPI controller.
+ */
+static void cdns_spi_init_hw(struct cdns_spi *xspi)
+{
+ cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
+ CDNS_SPI_ER_DISABLE_MASK);
+ cdns_spi_write(xspi, CDNS_SPI_IDR_OFFSET,
+ CDNS_SPI_IXR_ALL_MASK);
+
+ /* Clear the RX FIFO */
+ while (cdns_spi_read(xspi, CDNS_SPI_ISR_OFFSET) &
+ CDNS_SPI_IXR_RXNEMTY_MASK)
+ cdns_spi_read(xspi, CDNS_SPI_RXD_OFFSET);
+
+ cdns_spi_write(xspi, CDNS_SPI_ISR_OFFSET,
+ CDNS_SPI_IXR_ALL_MASK);
+ cdns_spi_write(xspi, CDNS_SPI_CR_OFFSET,
+ CDNS_SPI_CR_DEFAULT_MASK);
+ cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
+ CDNS_SPI_ER_ENABLE_MASK);
+}
+
+/**
+ * cdns_spi_chipselect - Select or deselect the chip select line
+ * @spi: Pointer to the spi_device structure
+ * @is_on: Select(0) or deselect (1) the chip select line
+ */
+static void cdns_spi_chipselect(struct spi_device *spi, bool is_high)
+{
+ struct cdns_spi *xspi = spi_master_get_devdata(spi->master);
+ u32 ctrl_reg;
+
+ ctrl_reg = cdns_spi_read(xspi, CDNS_SPI_CR_OFFSET);
+
+ if (is_high) {
+ /* Deselect the slave */
+ ctrl_reg |= CDNS_SPI_CR_SSCTRL_MASK;
+ } else {
+ /* Select the slave */
+ ctrl_reg &= ~CDNS_SPI_CR_SSCTRL_MASK;
+ if (!(xspi->is_decoded_cs))
+ ctrl_reg |= ((~(CDNS_SPI_SS0 << spi->chip_select)) <<
+ CDNS_SPI_SS_SHIFT) &
+ CDNS_SPI_CR_SSCTRL_MASK;
+ else
+ ctrl_reg |= (spi->chip_select << CDNS_SPI_SS_SHIFT) &
+ CDNS_SPI_CR_SSCTRL_MASK;
+ }
+
+ cdns_spi_write(xspi, CDNS_SPI_CR_OFFSET, ctrl_reg);
+}
+
+/**
+ * cdns_spi_config_clock_mode - Sets clock polarity and phase
+ * @spi: Pointer to the spi_device structure
+ *
+ * Sets the requested clock polarity and phase.
+ */
+static void cdns_spi_config_clock_mode(struct spi_device *spi)
+{
+ struct cdns_spi *xspi = spi_master_get_devdata(spi->master);
+ u32 ctrl_reg;
+
+ ctrl_reg = cdns_spi_read(xspi, CDNS_SPI_CR_OFFSET);
+
+ /* Set the SPI clock phase and clock polarity */
+ ctrl_reg &= ~(CDNS_SPI_CR_CPHA_MASK | CDNS_SPI_CR_CPOL_MASK);
+ if (spi->mode & SPI_CPHA)
+ ctrl_reg |= CDNS_SPI_CR_CPHA_MASK;
+ if (spi->mode & SPI_CPOL)
+ ctrl_reg |= CDNS_SPI_CR_CPOL_MASK;
+
+ cdns_spi_write(xspi, CDNS_SPI_CR_OFFSET, ctrl_reg);
+}
+
+/**
+ * cdns_spi_config_clock_freq - Sets clock frequency
+ * @spi: Pointer to the spi_device structure
+ * @transfer: Pointer to the spi_transfer structure which provides
+ * information about next transfer setup parameters
+ *
+ * Sets the requested clock frequency.
+ * Note: If the requested frequency is not an exact match with what can be
+ * obtained using the prescalar value the driver sets the clock frequency which
+ * is lower than the requested frequency (maximum lower) for the transfer. If
+ * the requested frequency is higher or lower than that is supported by the SPI
+ * controller the driver will set the highest or lowest frequency supported by
+ * controller.
+ */
+static void cdns_spi_config_clock_freq(struct spi_device *spi,
+ struct spi_transfer *transfer)
+{
+ struct cdns_spi *xspi = spi_master_get_devdata(spi->master);
+ u32 ctrl_reg, baud_rate_val;
+ unsigned long frequency;
+
+ frequency = clk_get_rate(xspi->ref_clk);
+
+ ctrl_reg = cdns_spi_read(xspi, CDNS_SPI_CR_OFFSET);
+
+ /* Set the clock frequency */
+ if (xspi->speed_hz != transfer->speed_hz) {
+ /* first valid value is 1 */
+ baud_rate_val = CDNS_SPI_BAUD_DIV_MIN;
+ while ((baud_rate_val < CDNS_SPI_BAUD_DIV_MAX) &&
+ (frequency / (2 << baud_rate_val)) > transfer->speed_hz)
+ baud_rate_val++;
+
+ ctrl_reg &= ~CDNS_SPI_CR_BAUD_DIV_MASK;
+ ctrl_reg |= baud_rate_val << CDNS_SPI_BAUD_DIV_SHIFT;
+
+ xspi->speed_hz = frequency / (2 << baud_rate_val);
+ }
+ cdns_spi_write(xspi, CDNS_SPI_CR_OFFSET, ctrl_reg);
+}
+
+/**
+ * cdns_spi_setup_transfer - Configure SPI controller for specified transfer
+ * @spi: Pointer to the spi_device structure
+ * @transfer: Pointer to the spi_transfer structure which provides
+ * information about next transfer setup parameters
+ *
+ * Sets the operational mode of SPI controller for the next SPI transfer and
+ * sets the requested clock frequency.
+ *
+ * Return: Always 0
+ */
+static int cdns_spi_setup_transfer(struct spi_device *spi,
+ struct spi_transfer *transfer)
+{
+ struct cdns_spi *xspi = spi_master_get_devdata(spi->master);
+
+ cdns_spi_config_clock_freq(spi, transfer);
+
+ dev_dbg(&spi->dev, "%s, mode %d, %u bits/w, %u clock speed\n",
+ __func__, spi->mode, spi->bits_per_word,
+ xspi->speed_hz);
+
+ return 0;
+}
+
+/**
+ * cdns_spi_fill_tx_fifo - Fills the TX FIFO with as many bytes as possible
+ * @xspi: Pointer to the cdns_spi structure
+ */
+static void cdns_spi_fill_tx_fifo(struct cdns_spi *xspi)
+{
+ unsigned long trans_cnt = 0;
+
+ while ((trans_cnt < CDNS_SPI_FIFO_DEPTH) &&
+ (xspi->tx_bytes > 0)) {
+ if (xspi->txbuf)
+ cdns_spi_write(xspi, CDNS_SPI_TXD_OFFSET,
+ *xspi->txbuf++);
+ else
+ cdns_spi_write(xspi, CDNS_SPI_TXD_OFFSET, 0);
+
+ xspi->tx_bytes--;
+ trans_cnt++;
+ }
+}
+
+/**
+ * cdns_spi_irq - Interrupt service routine of the SPI controller
+ * @irq: IRQ number
+ * @dev_id: Pointer to the xspi structure
+ *
+ * This function handles TX empty and Mode Fault interrupts only.
+ * On TX empty interrupt this function reads the received data from RX FIFO and
+ * fills the TX FIFO if there is any data remaining to be transferred.
+ * On Mode Fault interrupt this function indicates that transfer is completed,
+ * the SPI subsystem will identify the error as the remaining bytes to be
+ * transferred is non-zero.
+ *
+ * Return: IRQ_HANDLED when handled; IRQ_NONE otherwise.
+ */
+static irqreturn_t cdns_spi_irq(int irq, void *dev_id)
+{
+ struct spi_master *master = dev_id;
+ struct cdns_spi *xspi = spi_master_get_devdata(master);
+ u32 intr_status, status;
+
+ status = IRQ_NONE;
+ intr_status = cdns_spi_read(xspi, CDNS_SPI_ISR_OFFSET);
+ cdns_spi_write(xspi, CDNS_SPI_ISR_OFFSET, intr_status);
+
+ if (intr_status & CDNS_SPI_IXR_MODF_MASK) {
+ /* Indicate that transfer is completed, the SPI subsystem will
+ * identify the error as the remaining bytes to be
+ * transferred is non-zero
+ */
+ cdns_spi_write(xspi, CDNS_SPI_IDR_OFFSET,
+ CDNS_SPI_IXR_DEFAULT_MASK);
+ spi_finalize_current_transfer(master);
+ status = IRQ_HANDLED;
+ } else if (intr_status & CDNS_SPI_IXR_TXOW_MASK) {
+ unsigned long trans_cnt;
+
+ trans_cnt = xspi->rx_bytes - xspi->tx_bytes;
+
+ /* Read out the data from the RX FIFO */
+ while (trans_cnt) {
+ u8 data;
+
+ data = cdns_spi_read(xspi, CDNS_SPI_RXD_OFFSET);
+ if (xspi->rxbuf)
+ *xspi->rxbuf++ = data;
+
+ xspi->rx_bytes--;
+ trans_cnt--;
+ }
+
+ if (xspi->tx_bytes) {
+ /* There is more data to send */
+ cdns_spi_fill_tx_fifo(xspi);
+ } else {
+ /* Transfer is completed */
+ cdns_spi_write(xspi, CDNS_SPI_IDR_OFFSET,
+ CDNS_SPI_IXR_DEFAULT_MASK);
+ spi_finalize_current_transfer(master);
+ }
+ status = IRQ_HANDLED;
+ }
+
+ return status;
+}
+
+/**
+ * cdns_transfer_one - Initiates the SPI transfer
+ * @master: Pointer to spi_master structure
+ * @spi: Pointer to the spi_device structure
+ * @transfer: Pointer to the spi_transfer structure which provides
+ * information about next transfer parameters
+ *
+ * This function fills the TX FIFO, starts the SPI transfer and
+ * returns a positive transfer count so that core will wait for completion.
+ *
+ * Return: Number of bytes transferred in the last transfer
+ */
+static int cdns_transfer_one(struct spi_master *master,
+ struct spi_device *spi,
+ struct spi_transfer *transfer)
+{
+ struct cdns_spi *xspi = spi_master_get_devdata(master);
+
+ xspi->txbuf = transfer->tx_buf;
+ xspi->rxbuf = transfer->rx_buf;
+ xspi->tx_bytes = transfer->len;
+ xspi->rx_bytes = transfer->len;
+
+ cdns_spi_setup_transfer(spi, transfer);
+
+ cdns_spi_fill_tx_fifo(xspi);
+
+ cdns_spi_write(xspi, CDNS_SPI_IER_OFFSET,
+ CDNS_SPI_IXR_DEFAULT_MASK);
+ return transfer->len;
+}
+
+/**
+ * cdns_prepare_transfer_hardware - Prepares hardware for transfer.
+ * @master: Pointer to the spi_master structure which provides
+ * information about the controller.
+ *
+ * This function enables SPI master controller.
+ *
+ * Return: 0 always
+ */
+static int cdns_prepare_transfer_hardware(struct spi_master *master)
+{
+ struct cdns_spi *xspi = spi_master_get_devdata(master);
+
+ cdns_spi_config_clock_mode(master->cur_msg->spi);
+
+ cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
+ CDNS_SPI_ER_ENABLE_MASK);
+
+ return 0;
+}
+
+/**
+ * cdns_unprepare_transfer_hardware - Relaxes hardware after transfer
+ * @master: Pointer to the spi_master structure which provides
+ * information about the controller.
+ *
+ * This function disables the SPI master controller.
+ *
+ * Return: 0 always
+ */
+static int cdns_unprepare_transfer_hardware(struct spi_master *master)
+{
+ struct cdns_spi *xspi = spi_master_get_devdata(master);
+
+ cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
+ CDNS_SPI_ER_DISABLE_MASK);
+
+ return 0;
+}
+
+/**
+ * cdns_spi_probe - Probe method for the SPI driver
+ * @pdev: Pointer to the platform_device structure
+ *
+ * This function initializes the driver data structures and the hardware.
+ *
+ * Return: 0 on success and error value on error
+ */
+static int cdns_spi_probe(struct platform_device *pdev)
+{
+ int ret = 0, irq;
+ struct spi_master *master;
+ struct cdns_spi *xspi;
+ struct resource *res;
+ u32 num_cs;
+
+ master = spi_alloc_master(&pdev->dev, sizeof(*xspi));
+ if (master == NULL)
+ return -ENOMEM;
+
+ xspi = spi_master_get_devdata(master);
+ master->dev.of_node = pdev->dev.of_node;
+ platform_set_drvdata(pdev, master);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ xspi->regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(xspi->regs)) {
+ ret = PTR_ERR(xspi->regs);
+ goto remove_master;
+ }
+
+ xspi->pclk = devm_clk_get(&pdev->dev, "pclk");
+ if (IS_ERR(xspi->pclk)) {
+ dev_err(&pdev->dev, "pclk clock not found.\n");
+ ret = PTR_ERR(xspi->pclk);
+ goto remove_master;
+ }
+
+ xspi->ref_clk = devm_clk_get(&pdev->dev, "ref_clk");
+ if (IS_ERR(xspi->ref_clk)) {
+ dev_err(&pdev->dev, "ref_clk clock not found.\n");
+ ret = PTR_ERR(xspi->ref_clk);
+ goto remove_master;
+ }
+
+ ret = clk_prepare_enable(xspi->pclk);
+ if (ret) {
+ dev_err(&pdev->dev, "Unable to enable APB clock.\n");
+ goto remove_master;
+ }
+
+ ret = clk_prepare_enable(xspi->ref_clk);
+ if (ret) {
+ dev_err(&pdev->dev, "Unable to enable device clock.\n");
+ goto clk_dis_apb;
+ }
+
+ /* SPI controller initializations */
+ cdns_spi_init_hw(xspi);
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq <= 0) {
+ ret = -ENXIO;
+ dev_err(&pdev->dev, "irq number is invalid\n");
+ goto remove_master;
+ }
+
+ ret = devm_request_irq(&pdev->dev, irq, cdns_spi_irq,
+ 0, pdev->name, master);
+ if (ret != 0) {
+ ret = -ENXIO;
+ dev_err(&pdev->dev, "request_irq failed\n");
+ goto remove_master;
+ }
+
+ ret = of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs);
+
+ if (ret < 0)
+ master->num_chipselect = CDNS_SPI_DEFAULT_NUM_CS;
+ else
+ master->num_chipselect = num_cs;
+
+ ret = of_property_read_u32(pdev->dev.of_node, "is-decoded-cs",
+ &xspi->is_decoded_cs);
+
+ if (ret < 0)
+ xspi->is_decoded_cs = 0;
+
+ master->prepare_transfer_hardware = cdns_prepare_transfer_hardware;
+ master->transfer_one = cdns_transfer_one;
+ master->unprepare_transfer_hardware = cdns_unprepare_transfer_hardware;
+ master->set_cs = cdns_spi_chipselect;
+ master->mode_bits = SPI_CPOL | SPI_CPHA;
+
+ /* Set to default valid value */
+ master->max_speed_hz = clk_get_rate(xspi->ref_clk) / 4;
+ xspi->speed_hz = master->max_speed_hz;
+
+ master->bits_per_word_mask = SPI_BPW_MASK(8);
+
+ ret = spi_register_master(master);
+ if (ret) {
+ dev_err(&pdev->dev, "spi_register_master failed\n");
+ goto clk_dis_all;
+ }
+
+ return ret;
+
+clk_dis_all:
+ clk_disable_unprepare(xspi->ref_clk);
+clk_dis_apb:
+ clk_disable_unprepare(xspi->pclk);
+remove_master:
+ spi_master_put(master);
+ return ret;
+}
+
+/**
+ * cdns_spi_remove - Remove method for the SPI driver
+ * @pdev: Pointer to the platform_device structure
+ *
+ * This function is called if a device is physically removed from the system or
+ * if the driver module is being unloaded. It frees all resources allocated to
+ * the device.
+ *
+ * Return: 0 on success and error value on error
+ */
+static int cdns_spi_remove(struct platform_device *pdev)
+{
+ struct spi_master *master = platform_get_drvdata(pdev);
+ struct cdns_spi *xspi = spi_master_get_devdata(master);
+
+ cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
+ CDNS_SPI_ER_DISABLE_MASK);
+
+ clk_disable_unprepare(xspi->ref_clk);
+ clk_disable_unprepare(xspi->pclk);
+
+ spi_unregister_master(master);
+
+ return 0;
+}
+
+/**
+ * cdns_spi_suspend - Suspend method for the SPI driver
+ * @dev: Address of the platform_device structure
+ *
+ * This function disables the SPI controller and
+ * changes the driver state to "suspend"
+ *
+ * Return: Always 0
+ */
+static int __maybe_unused cdns_spi_suspend(struct device *dev)
+{
+ struct platform_device *pdev = container_of(dev,
+ struct platform_device, dev);
+ struct spi_master *master = platform_get_drvdata(pdev);
+ struct cdns_spi *xspi = spi_master_get_devdata(master);
+
+ spi_master_suspend(master);
+
+ clk_disable_unprepare(xspi->ref_clk);
+
+ clk_disable_unprepare(xspi->pclk);
+
+ return 0;
+}
+
+/**
+ * cdns_spi_resume - Resume method for the SPI driver
+ * @dev: Address of the platform_device structure
+ *
+ * This function changes the driver state to "ready"
+ *
+ * Return: 0 on success and error value on error
+ */
+static int __maybe_unused cdns_spi_resume(struct device *dev)
+{
+ struct platform_device *pdev = container_of(dev,
+ struct platform_device, dev);
+ struct spi_master *master = platform_get_drvdata(pdev);
+ struct cdns_spi *xspi = spi_master_get_devdata(master);
+ int ret = 0;
+
+ ret = clk_prepare_enable(xspi->pclk);
+ if (ret) {
+ dev_err(dev, "Cannot enable APB clock.\n");
+ return ret;
+ }
+
+ ret = clk_prepare_enable(xspi->ref_clk);
+ if (ret) {
+ dev_err(dev, "Cannot enable device clock.\n");
+ clk_disable(xspi->pclk);
+ return ret;
+ }
+ spi_master_resume(master);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(cdns_spi_dev_pm_ops, cdns_spi_suspend,
+ cdns_spi_resume);
+
+static struct of_device_id cdns_spi_of_match[] = {
+ { .compatible = "xlnx,zynq-spi-r1p6" },
+ { .compatible = "cdns,spi-r1p6" },
+ { /* end of table */ }
+};
+MODULE_DEVICE_TABLE(of, cdns_spi_of_match);
+
+/* cdns_spi_driver - This structure defines the SPI subsystem platform driver */
+static struct platform_driver cdns_spi_driver = {
+ .probe = cdns_spi_probe,
+ .remove = cdns_spi_remove,
+ .driver = {
+ .name = CDNS_SPI_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = cdns_spi_of_match,
+ .pm = &cdns_spi_dev_pm_ops,
+ },
+};
+
+module_platform_driver(cdns_spi_driver);
+
+MODULE_AUTHOR("Xilinx, Inc.");
+MODULE_DESCRIPTION("Cadence SPI driver");
+MODULE_LICENSE("GPL");
#include <linux/spi/spi.h>
#include <linux/scatterlist.h>
#include <linux/module.h>
+#include <linux/of_gpio.h>
#include "spi-dw.h"
dws->num_cs = 4;
dws->max_freq = clk_get_rate(dwsmmio->clk);
+ if (pdev->dev.of_node) {
+ int i;
+
+ for (i = 0; i < dws->num_cs; i++) {
+ int cs_gpio = of_get_named_gpio(pdev->dev.of_node,
+ "cs-gpios", i);
+
+ if (cs_gpio == -EPROBE_DEFER) {
+ ret = cs_gpio;
+ goto out;
+ }
+
+ if (gpio_is_valid(cs_gpio)) {
+ ret = devm_gpio_request(&pdev->dev, cs_gpio,
+ dev_name(&pdev->dev));
+ if (ret)
+ goto out;
+ }
+ }
+ }
+
ret = dw_spi_add_host(&pdev->dev, dws);
if (ret)
goto out;
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
+#include <linux/gpio.h>
#include "spi-dw.h"
#define DONE_STATE ((void *)2)
#define ERROR_STATE ((void *)-1)
-#define QUEUE_RUNNING 0
-#define QUEUE_STOPPED 1
-
-#define MRST_SPI_DEASSERT 0
-#define MRST_SPI_ASSERT 1
-
/* Slave spi_dev related */
struct chip_data {
u16 cr0;
static void giveback(struct dw_spi *dws)
{
struct spi_transfer *last_transfer;
- unsigned long flags;
struct spi_message *msg;
- spin_lock_irqsave(&dws->lock, flags);
msg = dws->cur_msg;
dws->cur_msg = NULL;
dws->cur_transfer = NULL;
dws->prev_chip = dws->cur_chip;
dws->cur_chip = NULL;
dws->dma_mapped = 0;
- queue_work(dws->workqueue, &dws->pump_messages);
- spin_unlock_irqrestore(&dws->lock, flags);
last_transfer = list_last_entry(&msg->transfers, struct spi_transfer,
transfer_list);
- if (!last_transfer->cs_change && dws->cs_control)
- dws->cs_control(MRST_SPI_DEASSERT);
+ if (!last_transfer->cs_change)
+ spi_chip_sel(dws, dws->cur_msg->spi, 0);
- msg->state = NULL;
- if (msg->complete)
- msg->complete(msg->context);
+ spi_finalize_current_message(dws->master);
}
static void int_error_stop(struct dw_spi *dws, const char *msg)
dw_writew(dws, DW_SPI_CTRL0, cr0);
spi_set_clk(dws, clk_div ? clk_div : chip->clk_div);
- spi_chip_sel(dws, spi->chip_select);
+ spi_chip_sel(dws, spi, 1);
/* Set the interrupt mask, for poll mode just disable all int */
spi_mask_intr(dws, 0xff);
return;
}
-static void pump_messages(struct work_struct *work)
+static int dw_spi_transfer_one_message(struct spi_master *master,
+ struct spi_message *msg)
{
- struct dw_spi *dws =
- container_of(work, struct dw_spi, pump_messages);
- unsigned long flags;
-
- /* Lock queue and check for queue work */
- spin_lock_irqsave(&dws->lock, flags);
- if (list_empty(&dws->queue) || dws->run == QUEUE_STOPPED) {
- dws->busy = 0;
- spin_unlock_irqrestore(&dws->lock, flags);
- return;
- }
-
- /* Make sure we are not already running a message */
- if (dws->cur_msg) {
- spin_unlock_irqrestore(&dws->lock, flags);
- return;
- }
-
- /* Extract head of queue */
- dws->cur_msg = list_entry(dws->queue.next, struct spi_message, queue);
- list_del_init(&dws->cur_msg->queue);
+ struct dw_spi *dws = spi_master_get_devdata(master);
+ dws->cur_msg = msg;
/* Initial message state*/
dws->cur_msg->state = START_STATE;
dws->cur_transfer = list_entry(dws->cur_msg->transfers.next,
transfer_list);
dws->cur_chip = spi_get_ctldata(dws->cur_msg->spi);
- /* Mark as busy and launch transfers */
+ /* Launch transfers */
tasklet_schedule(&dws->pump_transfers);
- dws->busy = 1;
- spin_unlock_irqrestore(&dws->lock, flags);
-}
-
-/* spi_device use this to queue in their spi_msg */
-static int dw_spi_transfer(struct spi_device *spi, struct spi_message *msg)
-{
- struct dw_spi *dws = spi_master_get_devdata(spi->master);
- unsigned long flags;
-
- spin_lock_irqsave(&dws->lock, flags);
-
- if (dws->run == QUEUE_STOPPED) {
- spin_unlock_irqrestore(&dws->lock, flags);
- return -ESHUTDOWN;
- }
-
- msg->actual_length = 0;
- msg->status = -EINPROGRESS;
- msg->state = START_STATE;
-
- list_add_tail(&msg->queue, &dws->queue);
-
- if (dws->run == QUEUE_RUNNING && !dws->busy) {
-
- if (dws->cur_transfer || dws->cur_msg)
- queue_work(dws->workqueue,
- &dws->pump_messages);
- else {
- /* If no other data transaction in air, just go */
- spin_unlock_irqrestore(&dws->lock, flags);
- pump_messages(&dws->pump_messages);
- return 0;
- }
- }
-
- spin_unlock_irqrestore(&dws->lock, flags);
return 0;
}
{
struct dw_spi_chip *chip_info = NULL;
struct chip_data *chip;
+ int ret;
/* Only alloc on first setup */
chip = spi_get_ctldata(spi);
| (spi->mode << SPI_MODE_OFFSET)
| (chip->tmode << SPI_TMOD_OFFSET);
- return 0;
-}
-
-static int init_queue(struct dw_spi *dws)
-{
- INIT_LIST_HEAD(&dws->queue);
- spin_lock_init(&dws->lock);
-
- dws->run = QUEUE_STOPPED;
- dws->busy = 0;
-
- tasklet_init(&dws->pump_transfers,
- pump_transfers, (unsigned long)dws);
-
- INIT_WORK(&dws->pump_messages, pump_messages);
- dws->workqueue = create_singlethread_workqueue(
- dev_name(dws->master->dev.parent));
- if (dws->workqueue == NULL)
- return -EBUSY;
-
- return 0;
-}
-
-static int start_queue(struct dw_spi *dws)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&dws->lock, flags);
-
- if (dws->run == QUEUE_RUNNING || dws->busy) {
- spin_unlock_irqrestore(&dws->lock, flags);
- return -EBUSY;
+ if (gpio_is_valid(spi->cs_gpio)) {
+ ret = gpio_direction_output(spi->cs_gpio,
+ !(spi->mode & SPI_CS_HIGH));
+ if (ret)
+ return ret;
}
- dws->run = QUEUE_RUNNING;
- dws->cur_msg = NULL;
- dws->cur_transfer = NULL;
- dws->cur_chip = NULL;
- dws->prev_chip = NULL;
- spin_unlock_irqrestore(&dws->lock, flags);
-
- queue_work(dws->workqueue, &dws->pump_messages);
-
- return 0;
-}
-
-static int stop_queue(struct dw_spi *dws)
-{
- unsigned long flags;
- unsigned limit = 50;
- int status = 0;
-
- spin_lock_irqsave(&dws->lock, flags);
- dws->run = QUEUE_STOPPED;
- while ((!list_empty(&dws->queue) || dws->busy) && limit--) {
- spin_unlock_irqrestore(&dws->lock, flags);
- msleep(10);
- spin_lock_irqsave(&dws->lock, flags);
- }
-
- if (!list_empty(&dws->queue) || dws->busy)
- status = -EBUSY;
- spin_unlock_irqrestore(&dws->lock, flags);
-
- return status;
-}
-
-static int destroy_queue(struct dw_spi *dws)
-{
- int status;
-
- status = stop_queue(dws);
- if (status != 0)
- return status;
- destroy_workqueue(dws->workqueue);
return 0;
}
master->bus_num = dws->bus_num;
master->num_chipselect = dws->num_cs;
master->setup = dw_spi_setup;
- master->transfer = dw_spi_transfer;
+ master->transfer_one_message = dw_spi_transfer_one_message;
master->max_speed_hz = dws->max_freq;
/* Basic HW init */
}
}
- /* Initial and start queue */
- ret = init_queue(dws);
- if (ret) {
- dev_err(&master->dev, "problem initializing queue\n");
- goto err_diable_hw;
- }
- ret = start_queue(dws);
- if (ret) {
- dev_err(&master->dev, "problem starting queue\n");
- goto err_diable_hw;
- }
+ tasklet_init(&dws->pump_transfers, pump_transfers, (unsigned long)dws);
spi_master_set_devdata(master, dws);
ret = devm_spi_register_master(dev, master);
if (ret) {
dev_err(&master->dev, "problem registering spi master\n");
- goto err_queue_alloc;
+ goto err_dma_exit;
}
mrst_spi_debugfs_init(dws);
return 0;
-err_queue_alloc:
- destroy_queue(dws);
+err_dma_exit:
if (dws->dma_ops && dws->dma_ops->dma_exit)
dws->dma_ops->dma_exit(dws);
-err_diable_hw:
spi_enable_chip(dws, 0);
err_free_master:
spi_master_put(master);
void dw_spi_remove_host(struct dw_spi *dws)
{
- int status = 0;
-
if (!dws)
return;
mrst_spi_debugfs_remove(dws);
- /* Remove the queue */
- status = destroy_queue(dws);
- if (status != 0)
- dev_err(&dws->master->dev,
- "dw_spi_remove: workqueue will not complete, message memory not freed\n");
-
if (dws->dma_ops && dws->dma_ops->dma_exit)
dws->dma_ops->dma_exit(dws);
spi_enable_chip(dws, 0);
{
int ret = 0;
- ret = stop_queue(dws);
+ ret = spi_master_suspend(dws->master);
if (ret)
return ret;
spi_enable_chip(dws, 0);
int ret;
spi_hw_init(dws);
- ret = start_queue(dws);
+ ret = spi_master_resume(dws->master);
if (ret)
dev_err(&dws->master->dev, "fail to start queue (%d)\n", ret);
return ret;
#include <linux/io.h>
#include <linux/scatterlist.h>
+#include <linux/gpio.h>
/* Register offsets */
#define DW_SPI_CTRL0 0x00
u16 bus_num;
u16 num_cs; /* supported slave numbers */
- /* Driver message queue */
- struct workqueue_struct *workqueue;
- struct work_struct pump_messages;
- spinlock_t lock;
- struct list_head queue;
- int busy;
- int run;
-
/* Message Transfer pump */
struct tasklet_struct pump_transfers;
dw_writel(dws, DW_SPI_BAUDR, div);
}
-static inline void spi_chip_sel(struct dw_spi *dws, u16 cs)
+static inline void spi_chip_sel(struct dw_spi *dws, struct spi_device *spi,
+ int active)
{
- if (cs > dws->num_cs)
- return;
+ u16 cs = spi->chip_select;
+ int gpio_val = active ? (spi->mode & SPI_CS_HIGH) :
+ !(spi->mode & SPI_CS_HIGH);
if (dws->cs_control)
- dws->cs_control(1);
+ dws->cs_control(active);
+ if (gpio_is_valid(spi->cs_gpio))
+ gpio_set_value(spi->cs_gpio, gpio_val);
- dw_writel(dws, DW_SPI_SER, 1 << cs);
+ if (active)
+ dw_writel(dws, DW_SPI_SER, 1 << cs);
}
/* Disable IRQ bits */
#include <linux/platform_device.h>
#include <linux/spi/spi.h>
#include <linux/delay.h>
-#include <linux/workqueue.h>
#include <linux/of.h>
#include <linux/of_platform.h>
return IRQ_HANDLED;
}
-static struct of_device_id fsl_dspi_dt_ids[] = {
+static const struct of_device_id fsl_dspi_dt_ids[] = {
{ .compatible = "fsl,vf610-dspi", .data = NULL, },
{ /* sentinel */ }
};
}
espi_trans->tx_buf = local_buf;
- espi_trans->rx_buf = local_buf + espi_trans->n_tx;
+ espi_trans->rx_buf = local_buf;
fsl_espi_do_trans(m, espi_trans);
espi_trans->actual_length = espi_trans->len;
espi_trans->n_rx = trans_len;
espi_trans->len = trans_len + n_tx;
espi_trans->tx_buf = local_buf;
- espi_trans->rx_buf = local_buf + n_tx;
+ espi_trans->rx_buf = local_buf;
fsl_espi_do_trans(m, espi_trans);
memcpy(rx_buf + pos, espi_trans->rx_buf + n_tx, trans_len);
return -EINVAL;
if (!cs) {
- cs = kzalloc(sizeof *cs, GFP_KERNEL);
+ cs = devm_kzalloc(&spi->dev, sizeof(*cs), GFP_KERNEL);
if (!cs)
return -ENOMEM;
spi->controller_state = cs;
struct spi_master *master;
struct mpc8xxx_spi *mpc8xxx_spi;
struct fsl_espi_reg *reg_base;
- u32 regval;
- int i, ret = 0;
+ struct device_node *nc;
+ const __be32 *prop;
+ u32 regval, csmode;
+ int i, len, ret = 0;
master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi));
if (!master) {
mpc8xxx_spi_write_reg(®_base->event, 0xffffffff);
/* Init eSPI CS mode register */
- for (i = 0; i < pdata->max_chipselect; i++)
- mpc8xxx_spi_write_reg(®_base->csmode[i], CSMODE_INIT_VAL);
+ for_each_available_child_of_node(master->dev.of_node, nc) {
+ /* get chip select */
+ prop = of_get_property(nc, "reg", &len);
+ if (!prop || len < sizeof(*prop))
+ continue;
+ i = be32_to_cpup(prop);
+ if (i < 0 || i >= pdata->max_chipselect)
+ continue;
+
+ csmode = CSMODE_INIT_VAL;
+ /* check if CSBEF is set in device tree */
+ prop = of_get_property(nc, "fsl,csbef", &len);
+ if (prop && len >= sizeof(*prop)) {
+ csmode &= ~(CSMODE_BEF(0xf));
+ csmode |= CSMODE_BEF(be32_to_cpup(prop));
+ }
+ /* check if CSAFT is set in device tree */
+ prop = of_get_property(nc, "fsl,csaft", &len);
+ if (prop && len >= sizeof(*prop)) {
+ csmode &= ~(CSMODE_AFT(0xf));
+ csmode |= CSMODE_AFT(be32_to_cpup(prop));
+ }
+ mpc8xxx_spi_write_reg(®_base->csmode[i], csmode);
+
+ dev_info(dev, "cs=%d, init_csmode=0x%x\n", i, csmode);
+ }
/* Enable SPI interface */
regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE;
return 0;
}
-void mpc8xxx_spi_cleanup(struct spi_device *spi)
-{
- kfree(spi->controller_state);
-}
-
const char *mpc8xxx_spi_strmode(unsigned int flags)
{
if (flags & SPI_QE_CPU_MODE) {
| SPI_LSB_FIRST | SPI_LOOP;
master->transfer = mpc8xxx_spi_transfer;
- master->cleanup = mpc8xxx_spi_cleanup;
master->dev.of_node = dev->of_node;
mpc8xxx_spi = spi_master_get_devdata(master);
extern int mpc8xxx_spi_bufs(struct mpc8xxx_spi *mspi,
struct spi_transfer *t, unsigned int len);
extern int mpc8xxx_spi_transfer(struct spi_device *spi, struct spi_message *m);
-extern void mpc8xxx_spi_cleanup(struct spi_device *spi);
extern const char *mpc8xxx_spi_strmode(unsigned int flags);
extern int mpc8xxx_spi_probe(struct device *dev, struct resource *mem,
unsigned int irq);
return -EINVAL;
if (!cs) {
- cs = kzalloc(sizeof *cs, GFP_KERNEL);
+ cs = devm_kzalloc(&spi->dev, sizeof(*cs), GFP_KERNEL);
if (!cs)
return -ENOMEM;
spi->controller_state = cs;
}
#ifdef CONFIG_OF
-static struct of_device_id spi_gpio_dt_ids[] = {
+static const struct of_device_id spi_gpio_dt_ids[] = {
{ .compatible = "spi-gpio" },
{}
};
#include <linux/module.h>
#include <linux/spinlock.h>
-#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
-#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/err.h>
#include <linux/clk.h>
}
pl022->dummypage = kmalloc(PAGE_SIZE, GFP_KERNEL);
- if (!pl022->dummypage) {
- dev_dbg(&pl022->adev->dev, "no DMA dummypage!\n");
+ if (!pl022->dummypage)
goto err_no_dummypage;
- }
dev_info(&pl022->adev->dev, "setup for DMA on RX %s, TX %s\n",
dma_chan_name(pl022->dma_rx_channel),
if (chip == NULL) {
chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL);
- if (!chip) {
- dev_err(&spi->dev,
- "cannot allocate controller state\n");
+ if (!chip)
return -ENOMEM;
- }
dev_dbg(&spi->dev,
"allocated memory for controller's runtime state\n");
}
}
pd = devm_kzalloc(dev, sizeof(struct pl022_ssp_controller), GFP_KERNEL);
- if (!pd) {
- dev_err(dev, "cannot allocate platform data memory\n");
+ if (!pd)
return NULL;
- }
pd->bus_id = -1;
pd->enable_dma = 1;
#include <linux/module.h>
#include <linux/spi/pxa2xx_spi.h>
-static int ce4100_spi_probe(struct pci_dev *dev,
+enum {
+ PORT_CE4100,
+ PORT_BYT,
+};
+
+struct pxa_spi_info {
+ enum pxa_ssp_type type;
+ int port_id;
+ int num_chipselect;
+ int tx_slave_id;
+ int tx_chan_id;
+ int rx_slave_id;
+ int rx_chan_id;
+};
+
+static struct pxa_spi_info spi_info_configs[] = {
+ [PORT_CE4100] = {
+ .type = PXA25x_SSP,
+ .port_id = -1,
+ .num_chipselect = -1,
+ .tx_slave_id = -1,
+ .tx_chan_id = -1,
+ .rx_slave_id = -1,
+ .rx_chan_id = -1,
+ },
+ [PORT_BYT] = {
+ .type = LPSS_SSP,
+ .port_id = 0,
+ .num_chipselect = 1,
+ .tx_slave_id = 0,
+ .tx_chan_id = 0,
+ .rx_slave_id = 1,
+ .rx_chan_id = 1,
+ },
+};
+
+static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
const struct pci_device_id *ent)
{
struct platform_device_info pi;
struct platform_device *pdev;
struct pxa2xx_spi_master spi_pdata;
struct ssp_device *ssp;
+ struct pxa_spi_info *c;
ret = pcim_enable_device(dev);
if (ret)
if (ret)
return ret;
+ c = &spi_info_configs[ent->driver_data];
+
memset(&spi_pdata, 0, sizeof(spi_pdata));
- spi_pdata.num_chipselect = dev->devfn;
+ spi_pdata.num_chipselect = (c->num_chipselect > 0) ?
+ c->num_chipselect : dev->devfn;
+ spi_pdata.tx_slave_id = c->tx_slave_id;
+ spi_pdata.tx_chan_id = c->tx_chan_id;
+ spi_pdata.rx_slave_id = c->rx_slave_id;
+ spi_pdata.rx_chan_id = c->rx_chan_id;
+ spi_pdata.enable_dma = c->rx_slave_id >= 0 && c->tx_slave_id >= 0;
ssp = &spi_pdata.ssp;
ssp->phys_base = pci_resource_start(dev, 0);
return -EIO;
}
ssp->irq = dev->irq;
- ssp->port_id = dev->devfn;
- ssp->type = PXA25x_SSP;
+ ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
+ ssp->type = c->type;
memset(&pi, 0, sizeof(pi));
pi.parent = &dev->dev;
return 0;
}
-static void ce4100_spi_remove(struct pci_dev *dev)
+static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
{
struct platform_device *pdev = pci_get_drvdata(dev);
platform_device_unregister(pdev);
}
-static const struct pci_device_id ce4100_spi_devices[] = {
- { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e6a) },
+static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
+ { PCI_VDEVICE(INTEL, 0x2e6a), PORT_CE4100 },
+ { PCI_VDEVICE(INTEL, 0x0f0e), PORT_BYT },
{ },
};
-MODULE_DEVICE_TABLE(pci, ce4100_spi_devices);
+MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
-static struct pci_driver ce4100_spi_driver = {
- .name = "ce4100_spi",
- .id_table = ce4100_spi_devices,
- .probe = ce4100_spi_probe,
- .remove = ce4100_spi_remove,
+static struct pci_driver pxa2xx_spi_pci_driver = {
+ .name = "pxa2xx_spi_pci",
+ .id_table = pxa2xx_spi_pci_devices,
+ .probe = pxa2xx_spi_pci_probe,
+ .remove = pxa2xx_spi_pci_remove,
};
-module_pci_driver(ce4100_spi_driver);
+module_pci_driver(pxa2xx_spi_pci_driver);
-MODULE_DESCRIPTION("CE4100 PCI-SPI glue code for PXA's driver");
+MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
#include <linux/platform_device.h>
#include <linux/spi/pxa2xx_spi.h>
#include <linux/spi/spi.h>
-#include <linux/workqueue.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/slab.h>
chip = spi_get_ctldata(spi);
if (!chip) {
chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL);
- if (!chip) {
- dev_err(&spi->dev,
- "failed setup: can't allocate chip data\n");
+ if (!chip)
return -ENOMEM;
- }
if (drv_data->ssp_type == CE4100_SSP) {
if (spi->chip_select > 4) {
return NULL;
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
- if (!pdata) {
- dev_err(&pdev->dev,
- "failed to allocate memory for platform data\n");
+ if (!pdata)
return NULL;
- }
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
tasklet_init(&drv_data->pump_transfers, pump_transfers,
(unsigned long)drv_data);
+ pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
+ pm_runtime_use_autosuspend(&pdev->dev);
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+
/* Register with the SPI framework */
platform_set_drvdata(pdev, drv_data);
status = devm_spi_register_master(&pdev->dev, master);
goto out_error_clock_enabled;
}
- pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
- pm_runtime_use_autosuspend(&pdev->dev);
- pm_runtime_set_active(&pdev->dev);
- pm_runtime_enable(&pdev->dev);
-
return status;
out_error_clock_enabled:
writel_relaxed(opflags, controller->base + QUP_OPERATIONAL);
if (!xfer) {
- dev_err_ratelimited(controller->dev, "unexpected irq %x08 %x08 %x08\n",
+ dev_err_ratelimited(controller->dev, "unexpected irq %08x %08x %08x\n",
qup_err, spi_err, opflags);
return IRQ_HANDLED;
}
n_words = xfer->len / w_size;
controller->w_size = w_size;
- if (n_words <= controller->in_fifo_sz) {
+ if (n_words <= (controller->in_fifo_sz / sizeof(u32))) {
mode = QUP_IO_M_MODE_FIFO;
writel_relaxed(n_words, controller->base + QUP_MX_READ_CNT);
writel_relaxed(n_words, controller->base + QUP_MX_WRITE_CNT);
return 0;
}
-static struct of_device_id spi_qup_dt_match[] = {
+static const struct of_device_id spi_qup_dt_match[] = {
{ .compatible = "qcom,spi-qup-v2.1.1", },
{ .compatible = "qcom,spi-qup-v2.2.1", },
{ }
#define SPBFCR_TXTRG_MASK 0x30 /* Transmit Buffer Data Triggering Number */
#define SPBFCR_RXTRG_MASK 0x07 /* Receive Buffer Data Triggering Number */
-#define DUMMY_DATA 0x00
-
struct rspi_data {
void __iomem *addr;
u32 max_speed_hz;
int rx_irq, tx_irq;
const struct spi_ops *ops;
- /* for dmaengine */
- struct dma_chan *chan_tx;
- struct dma_chan *chan_rx;
-
- unsigned dma_width_16bit:1;
unsigned dma_callbacked:1;
unsigned byte_access:1;
};
int (*transfer_one)(struct spi_master *master, struct spi_device *spi,
struct spi_transfer *xfer);
u16 mode_bits;
+ u16 flags;
+ u16 fifo_size;
};
/*
rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR);
/* Sets transfer bit rate */
- spbr = clk_get_rate(rspi->clk) / (2 * rspi->max_speed_hz) - 1;
+ spbr = DIV_ROUND_UP(clk_get_rate(rspi->clk),
+ 2 * rspi->max_speed_hz) - 1;
rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR);
/* Disable dummy transmission, set 16-bit word access, 1 frame */
rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR);
/* Sets transfer bit rate */
- spbr = clk_get_rate(rspi->clk) / (2 * rspi->max_speed_hz) - 1;
+ spbr = DIV_ROUND_UP(clk_get_rate(rspi->clk),
+ 2 * rspi->max_speed_hz) - 1;
rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR);
/* Disable dummy transmission, set byte access */
rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR);
/* Sets transfer bit rate */
- spbr = clk_get_rate(rspi->clk) / (2 * rspi->max_speed_hz);
+ spbr = DIV_ROUND_UP(clk_get_rate(rspi->clk), 2 * rspi->max_speed_hz);
rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR);
/* Disable dummy transmission, set byte access */
return 0;
}
+static inline int rspi_wait_for_tx_empty(struct rspi_data *rspi)
+{
+ return rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE);
+}
+
+static inline int rspi_wait_for_rx_full(struct rspi_data *rspi)
+{
+ return rspi_wait_for_interrupt(rspi, SPSR_SPRF, SPCR_SPRIE);
+}
+
static int rspi_data_out(struct rspi_data *rspi, u8 data)
{
- if (rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE) < 0) {
+ int error = rspi_wait_for_tx_empty(rspi);
+ if (error < 0) {
dev_err(&rspi->master->dev, "transmit timeout\n");
- return -ETIMEDOUT;
+ return error;
}
rspi_write_data(rspi, data);
return 0;
static int rspi_data_in(struct rspi_data *rspi)
{
+ int error;
u8 data;
- if (rspi_wait_for_interrupt(rspi, SPSR_SPRF, SPCR_SPRIE) < 0) {
+ error = rspi_wait_for_rx_full(rspi);
+ if (error < 0) {
dev_err(&rspi->master->dev, "receive timeout\n");
- return -ETIMEDOUT;
+ return error;
}
data = rspi_read_data(rspi);
return data;
}
-static int rspi_data_out_in(struct rspi_data *rspi, u8 data)
+static int rspi_pio_transfer(struct rspi_data *rspi, const u8 *tx, u8 *rx,
+ unsigned int n)
{
- int ret;
-
- ret = rspi_data_out(rspi, data);
- if (ret < 0)
- return ret;
+ while (n-- > 0) {
+ if (tx) {
+ int ret = rspi_data_out(rspi, *tx++);
+ if (ret < 0)
+ return ret;
+ }
+ if (rx) {
+ int ret = rspi_data_in(rspi);
+ if (ret < 0)
+ return ret;
+ *rx++ = ret;
+ }
+ }
- return rspi_data_in(rspi);
+ return 0;
}
static void rspi_dma_complete(void *arg)
wake_up_interruptible(&rspi->wait);
}
-static int rspi_dma_map_sg(struct scatterlist *sg, const void *buf,
- unsigned len, struct dma_chan *chan,
- enum dma_transfer_direction dir)
-{
- sg_init_table(sg, 1);
- sg_set_buf(sg, buf, len);
- sg_dma_len(sg) = len;
- return dma_map_sg(chan->device->dev, sg, 1, dir);
-}
-
-static void rspi_dma_unmap_sg(struct scatterlist *sg, struct dma_chan *chan,
- enum dma_transfer_direction dir)
+static int rspi_dma_transfer(struct rspi_data *rspi, struct sg_table *tx,
+ struct sg_table *rx)
{
- dma_unmap_sg(chan->device->dev, sg, 1, dir);
-}
-
-static void rspi_memory_to_8bit(void *buf, const void *data, unsigned len)
-{
- u16 *dst = buf;
- const u8 *src = data;
-
- while (len) {
- *dst++ = (u16)(*src++);
- len--;
- }
-}
-
-static void rspi_memory_from_8bit(void *buf, const void *data, unsigned len)
-{
- u8 *dst = buf;
- const u16 *src = data;
-
- while (len) {
- *dst++ = (u8)*src++;
- len--;
- }
-}
+ struct dma_async_tx_descriptor *desc_tx = NULL, *desc_rx = NULL;
+ u8 irq_mask = 0;
+ unsigned int other_irq = 0;
+ dma_cookie_t cookie;
+ int ret;
-static int rspi_send_dma(struct rspi_data *rspi, struct spi_transfer *t)
-{
- struct scatterlist sg;
- const void *buf = NULL;
- struct dma_async_tx_descriptor *desc;
- unsigned int len;
- int ret = 0;
-
- if (rspi->dma_width_16bit) {
- void *tmp;
- /*
- * If DMAC bus width is 16-bit, the driver allocates a dummy
- * buffer. And, the driver converts original data into the
- * DMAC data as the following format:
- * original data: 1st byte, 2nd byte ...
- * DMAC data: 1st byte, dummy, 2nd byte, dummy ...
- */
- len = t->len * 2;
- tmp = kmalloc(len, GFP_KERNEL);
- if (!tmp)
- return -ENOMEM;
- rspi_memory_to_8bit(tmp, t->tx_buf, t->len);
- buf = tmp;
- } else {
- len = t->len;
- buf = t->tx_buf;
- }
+ if (tx) {
+ desc_tx = dmaengine_prep_slave_sg(rspi->master->dma_tx,
+ tx->sgl, tx->nents, DMA_TO_DEVICE,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!desc_tx)
+ return -EIO;
- if (!rspi_dma_map_sg(&sg, buf, len, rspi->chan_tx, DMA_TO_DEVICE)) {
- ret = -EFAULT;
- goto end_nomap;
+ irq_mask |= SPCR_SPTIE;
}
- desc = dmaengine_prep_slave_sg(rspi->chan_tx, &sg, 1, DMA_TO_DEVICE,
- DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
- if (!desc) {
- ret = -EIO;
- goto end;
+ if (rx) {
+ desc_rx = dmaengine_prep_slave_sg(rspi->master->dma_rx,
+ rx->sgl, rx->nents, DMA_FROM_DEVICE,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!desc_rx)
+ return -EIO;
+
+ irq_mask |= SPCR_SPRIE;
}
/*
- * DMAC needs SPTIE, but if SPTIE is set, this IRQ routine will be
+ * DMAC needs SPxIE, but if SPxIE is set, the IRQ routine will be
* called. So, this driver disables the IRQ while DMA transfer.
*/
- disable_irq(rspi->tx_irq);
+ if (tx)
+ disable_irq(other_irq = rspi->tx_irq);
+ if (rx && rspi->rx_irq != other_irq)
+ disable_irq(rspi->rx_irq);
- rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | SPCR_TXMD, RSPI_SPCR);
- rspi_enable_irq(rspi, SPCR_SPTIE);
+ rspi_enable_irq(rspi, irq_mask);
rspi->dma_callbacked = 0;
- desc->callback = rspi_dma_complete;
- desc->callback_param = rspi;
- dmaengine_submit(desc);
- dma_async_issue_pending(rspi->chan_tx);
+ if (rx) {
+ desc_rx->callback = rspi_dma_complete;
+ desc_rx->callback_param = rspi;
+ cookie = dmaengine_submit(desc_rx);
+ if (dma_submit_error(cookie))
+ return cookie;
+ dma_async_issue_pending(rspi->master->dma_rx);
+ }
+ if (tx) {
+ if (rx) {
+ /* No callback */
+ desc_tx->callback = NULL;
+ } else {
+ desc_tx->callback = rspi_dma_complete;
+ desc_tx->callback_param = rspi;
+ }
+ cookie = dmaengine_submit(desc_tx);
+ if (dma_submit_error(cookie))
+ return cookie;
+ dma_async_issue_pending(rspi->master->dma_tx);
+ }
ret = wait_event_interruptible_timeout(rspi->wait,
rspi->dma_callbacked, HZ);
ret = 0;
else if (!ret)
ret = -ETIMEDOUT;
- rspi_disable_irq(rspi, SPCR_SPTIE);
- enable_irq(rspi->tx_irq);
+ rspi_disable_irq(rspi, irq_mask);
-end:
- rspi_dma_unmap_sg(&sg, rspi->chan_tx, DMA_TO_DEVICE);
-end_nomap:
- if (rspi->dma_width_16bit)
- kfree(buf);
+ if (tx)
+ enable_irq(rspi->tx_irq);
+ if (rx && rspi->rx_irq != other_irq)
+ enable_irq(rspi->rx_irq);
return ret;
}
rspi_write8(rspi, 0, QSPI_SPBFCR);
}
-static int rspi_receive_dma(struct rspi_data *rspi, struct spi_transfer *t)
+static bool __rspi_can_dma(const struct rspi_data *rspi,
+ const struct spi_transfer *xfer)
{
- struct scatterlist sg, sg_dummy;
- void *dummy = NULL, *rx_buf = NULL;
- struct dma_async_tx_descriptor *desc, *desc_dummy;
- unsigned int len;
- int ret = 0;
-
- if (rspi->dma_width_16bit) {
- /*
- * If DMAC bus width is 16-bit, the driver allocates a dummy
- * buffer. And, finally the driver converts the DMAC data into
- * actual data as the following format:
- * DMAC data: 1st byte, dummy, 2nd byte, dummy ...
- * actual data: 1st byte, 2nd byte ...
- */
- len = t->len * 2;
- rx_buf = kmalloc(len, GFP_KERNEL);
- if (!rx_buf)
- return -ENOMEM;
- } else {
- len = t->len;
- rx_buf = t->rx_buf;
- }
-
- /* prepare dummy transfer to generate SPI clocks */
- dummy = kzalloc(len, GFP_KERNEL);
- if (!dummy) {
- ret = -ENOMEM;
- goto end_nomap;
- }
- if (!rspi_dma_map_sg(&sg_dummy, dummy, len, rspi->chan_tx,
- DMA_TO_DEVICE)) {
- ret = -EFAULT;
- goto end_nomap;
- }
- desc_dummy = dmaengine_prep_slave_sg(rspi->chan_tx, &sg_dummy, 1,
- DMA_TO_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
- if (!desc_dummy) {
- ret = -EIO;
- goto end_dummy_mapped;
- }
-
- /* prepare receive transfer */
- if (!rspi_dma_map_sg(&sg, rx_buf, len, rspi->chan_rx,
- DMA_FROM_DEVICE)) {
- ret = -EFAULT;
- goto end_dummy_mapped;
-
- }
- desc = dmaengine_prep_slave_sg(rspi->chan_rx, &sg, 1, DMA_FROM_DEVICE,
- DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
- if (!desc) {
- ret = -EIO;
- goto end;
- }
-
- rspi_receive_init(rspi);
-
- /*
- * DMAC needs SPTIE, but if SPTIE is set, this IRQ routine will be
- * called. So, this driver disables the IRQ while DMA transfer.
- */
- disable_irq(rspi->tx_irq);
- if (rspi->rx_irq != rspi->tx_irq)
- disable_irq(rspi->rx_irq);
-
- rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~SPCR_TXMD, RSPI_SPCR);
- rspi_enable_irq(rspi, SPCR_SPTIE | SPCR_SPRIE);
- rspi->dma_callbacked = 0;
-
- desc->callback = rspi_dma_complete;
- desc->callback_param = rspi;
- dmaengine_submit(desc);
- dma_async_issue_pending(rspi->chan_rx);
-
- desc_dummy->callback = NULL; /* No callback */
- dmaengine_submit(desc_dummy);
- dma_async_issue_pending(rspi->chan_tx);
-
- ret = wait_event_interruptible_timeout(rspi->wait,
- rspi->dma_callbacked, HZ);
- if (ret > 0 && rspi->dma_callbacked)
- ret = 0;
- else if (!ret)
- ret = -ETIMEDOUT;
- rspi_disable_irq(rspi, SPCR_SPTIE | SPCR_SPRIE);
-
- enable_irq(rspi->tx_irq);
- if (rspi->rx_irq != rspi->tx_irq)
- enable_irq(rspi->rx_irq);
-
-end:
- rspi_dma_unmap_sg(&sg, rspi->chan_rx, DMA_FROM_DEVICE);
-end_dummy_mapped:
- rspi_dma_unmap_sg(&sg_dummy, rspi->chan_tx, DMA_TO_DEVICE);
-end_nomap:
- if (rspi->dma_width_16bit) {
- if (!ret)
- rspi_memory_from_8bit(t->rx_buf, rx_buf, t->len);
- kfree(rx_buf);
- }
- kfree(dummy);
-
- return ret;
+ return xfer->len > rspi->ops->fifo_size;
}
-static int rspi_is_dma(const struct rspi_data *rspi, struct spi_transfer *t)
+static bool rspi_can_dma(struct spi_master *master, struct spi_device *spi,
+ struct spi_transfer *xfer)
{
- if (t->tx_buf && rspi->chan_tx)
- return 1;
- /* If the module receives data by DMAC, it also needs TX DMAC */
- if (t->rx_buf && rspi->chan_tx && rspi->chan_rx)
- return 1;
+ struct rspi_data *rspi = spi_master_get_devdata(master);
- return 0;
+ return __rspi_can_dma(rspi, xfer);
}
-static int rspi_transfer_out_in(struct rspi_data *rspi,
+static int rspi_common_transfer(struct rspi_data *rspi,
struct spi_transfer *xfer)
{
- int remain = xfer->len, ret;
- const u8 *tx_buf = xfer->tx_buf;
- u8 *rx_buf = xfer->rx_buf;
- u8 spcr, data;
-
- rspi_receive_init(rspi);
-
- spcr = rspi_read8(rspi, RSPI_SPCR);
- if (rx_buf)
- spcr &= ~SPCR_TXMD;
- else
- spcr |= SPCR_TXMD;
- rspi_write8(rspi, spcr, RSPI_SPCR);
+ int ret;
- while (remain > 0) {
- data = tx_buf ? *tx_buf++ : DUMMY_DATA;
- ret = rspi_data_out(rspi, data);
- if (ret < 0)
- return ret;
- if (rx_buf) {
- ret = rspi_data_in(rspi);
- if (ret < 0)
- return ret;
- *rx_buf++ = ret;
- }
- remain--;
+ if (rspi->master->can_dma && __rspi_can_dma(rspi, xfer)) {
+ /* rx_buf can be NULL on RSPI on SH in TX-only Mode */
+ return rspi_dma_transfer(rspi, &xfer->tx_sg,
+ xfer->rx_buf ? &xfer->rx_sg : NULL);
}
+ ret = rspi_pio_transfer(rspi, xfer->tx_buf, xfer->rx_buf, xfer->len);
+ if (ret < 0)
+ return ret;
+
/* Wait for the last transmission */
- rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE);
+ rspi_wait_for_tx_empty(rspi);
return 0;
}
struct spi_transfer *xfer)
{
struct rspi_data *rspi = spi_master_get_devdata(master);
- int ret;
+ u8 spcr;
- if (!rspi_is_dma(rspi, xfer))
- return rspi_transfer_out_in(rspi, xfer);
-
- if (xfer->tx_buf) {
- ret = rspi_send_dma(rspi, xfer);
- if (ret < 0)
- return ret;
- }
- if (xfer->rx_buf)
- return rspi_receive_dma(rspi, xfer);
-
- return 0;
-}
-
-static int rspi_rz_transfer_out_in(struct rspi_data *rspi,
- struct spi_transfer *xfer)
-{
- int remain = xfer->len, ret;
- const u8 *tx_buf = xfer->tx_buf;
- u8 *rx_buf = xfer->rx_buf;
- u8 data;
-
- rspi_rz_receive_init(rspi);
-
- while (remain > 0) {
- data = tx_buf ? *tx_buf++ : DUMMY_DATA;
- ret = rspi_data_out_in(rspi, data);
- if (ret < 0)
- return ret;
- if (rx_buf)
- *rx_buf++ = ret;
- remain--;
+ spcr = rspi_read8(rspi, RSPI_SPCR);
+ if (xfer->rx_buf) {
+ rspi_receive_init(rspi);
+ spcr &= ~SPCR_TXMD;
+ } else {
+ spcr |= SPCR_TXMD;
}
+ rspi_write8(rspi, spcr, RSPI_SPCR);
- /* Wait for the last transmission */
- rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE);
-
- return 0;
+ return rspi_common_transfer(rspi, xfer);
}
static int rspi_rz_transfer_one(struct spi_master *master,
struct spi_transfer *xfer)
{
struct rspi_data *rspi = spi_master_get_devdata(master);
+ int ret;
- return rspi_rz_transfer_out_in(rspi, xfer);
+ rspi_rz_receive_init(rspi);
+
+ return rspi_common_transfer(rspi, xfer);
}
static int qspi_transfer_out_in(struct rspi_data *rspi,
struct spi_transfer *xfer)
{
- int remain = xfer->len, ret;
- const u8 *tx_buf = xfer->tx_buf;
- u8 *rx_buf = xfer->rx_buf;
- u8 data;
-
qspi_receive_init(rspi);
- while (remain > 0) {
- data = tx_buf ? *tx_buf++ : DUMMY_DATA;
- ret = rspi_data_out_in(rspi, data);
- if (ret < 0)
- return ret;
- if (rx_buf)
- *rx_buf++ = ret;
- remain--;
- }
-
- /* Wait for the last transmission */
- rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE);
-
- return 0;
+ return rspi_common_transfer(rspi, xfer);
}
static int qspi_transfer_out(struct rspi_data *rspi, struct spi_transfer *xfer)
{
- const u8 *buf = xfer->tx_buf;
- unsigned int i;
int ret;
- for (i = 0; i < xfer->len; i++) {
- ret = rspi_data_out(rspi, *buf++);
- if (ret < 0)
- return ret;
- }
+ if (rspi->master->can_dma && __rspi_can_dma(rspi, xfer))
+ return rspi_dma_transfer(rspi, &xfer->tx_sg, NULL);
+
+ ret = rspi_pio_transfer(rspi, xfer->tx_buf, NULL, xfer->len);
+ if (ret < 0)
+ return ret;
/* Wait for the last transmission */
- rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE);
+ rspi_wait_for_tx_empty(rspi);
return 0;
}
static int qspi_transfer_in(struct rspi_data *rspi, struct spi_transfer *xfer)
{
- u8 *buf = xfer->rx_buf;
- unsigned int i;
- int ret;
-
- for (i = 0; i < xfer->len; i++) {
- ret = rspi_data_in(rspi);
- if (ret < 0)
- return ret;
- *buf++ = ret;
- }
+ if (rspi->master->can_dma && __rspi_can_dma(rspi, xfer))
+ return rspi_dma_transfer(rspi, NULL, &xfer->rx_sg);
- return 0;
+ return rspi_pio_transfer(rspi, NULL, xfer->rx_buf, xfer->len);
}
static int qspi_transfer_one(struct spi_master *master, struct spi_device *spi,
if (spi->mode & SPI_LOOP) {
return qspi_transfer_out_in(rspi, xfer);
- } else if (xfer->tx_buf && xfer->tx_nbits > SPI_NBITS_SINGLE) {
+ } else if (xfer->tx_nbits > SPI_NBITS_SINGLE) {
/* Quad or Dual SPI Write */
return qspi_transfer_out(rspi, xfer);
- } else if (xfer->rx_buf && xfer->rx_nbits > SPI_NBITS_SINGLE) {
+ } else if (xfer->rx_nbits > SPI_NBITS_SINGLE) {
/* Quad or Dual SPI Read */
return qspi_transfer_in(rspi, xfer);
} else {
return 0;
}
-static int rspi_request_dma(struct rspi_data *rspi,
- struct platform_device *pdev)
+static struct dma_chan *rspi_request_dma_chan(struct device *dev,
+ enum dma_transfer_direction dir,
+ unsigned int id,
+ dma_addr_t port_addr)
{
- const struct rspi_plat_data *rspi_pd = dev_get_platdata(&pdev->dev);
- struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
dma_cap_mask_t mask;
+ struct dma_chan *chan;
struct dma_slave_config cfg;
int ret;
- if (!res || !rspi_pd)
- return 0; /* The driver assumes no error. */
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
- rspi->dma_width_16bit = rspi_pd->dma_width_16bit;
-
- /* If the module receives data by DMAC, it also needs TX DMAC */
- if (rspi_pd->dma_rx_id && rspi_pd->dma_tx_id) {
- dma_cap_zero(mask);
- dma_cap_set(DMA_SLAVE, mask);
- rspi->chan_rx = dma_request_channel(mask, shdma_chan_filter,
- (void *)rspi_pd->dma_rx_id);
- if (rspi->chan_rx) {
- cfg.slave_id = rspi_pd->dma_rx_id;
- cfg.direction = DMA_DEV_TO_MEM;
- cfg.dst_addr = 0;
- cfg.src_addr = res->start + RSPI_SPDR;
- ret = dmaengine_slave_config(rspi->chan_rx, &cfg);
- if (!ret)
- dev_info(&pdev->dev, "Use DMA when rx.\n");
- else
- return ret;
- }
+ chan = dma_request_channel(mask, shdma_chan_filter,
+ (void *)(unsigned long)id);
+ if (!chan) {
+ dev_warn(dev, "dma_request_channel failed\n");
+ return NULL;
}
- if (rspi_pd->dma_tx_id) {
- dma_cap_zero(mask);
- dma_cap_set(DMA_SLAVE, mask);
- rspi->chan_tx = dma_request_channel(mask, shdma_chan_filter,
- (void *)rspi_pd->dma_tx_id);
- if (rspi->chan_tx) {
- cfg.slave_id = rspi_pd->dma_tx_id;
- cfg.direction = DMA_MEM_TO_DEV;
- cfg.dst_addr = res->start + RSPI_SPDR;
- cfg.src_addr = 0;
- ret = dmaengine_slave_config(rspi->chan_tx, &cfg);
- if (!ret)
- dev_info(&pdev->dev, "Use DMA when tx\n");
- else
- return ret;
- }
+
+ memset(&cfg, 0, sizeof(cfg));
+ cfg.slave_id = id;
+ cfg.direction = dir;
+ if (dir == DMA_MEM_TO_DEV)
+ cfg.dst_addr = port_addr;
+ else
+ cfg.src_addr = port_addr;
+
+ ret = dmaengine_slave_config(chan, &cfg);
+ if (ret) {
+ dev_warn(dev, "dmaengine_slave_config failed %d\n", ret);
+ dma_release_channel(chan);
+ return NULL;
}
+ return chan;
+}
+
+static int rspi_request_dma(struct device *dev, struct spi_master *master,
+ const struct resource *res)
+{
+ const struct rspi_plat_data *rspi_pd = dev_get_platdata(dev);
+
+ if (!rspi_pd || !rspi_pd->dma_rx_id || !rspi_pd->dma_tx_id)
+ return 0; /* The driver assumes no error. */
+
+ master->dma_rx = rspi_request_dma_chan(dev, DMA_DEV_TO_MEM,
+ rspi_pd->dma_rx_id,
+ res->start + RSPI_SPDR);
+ if (!master->dma_rx)
+ return -ENODEV;
+
+ master->dma_tx = rspi_request_dma_chan(dev, DMA_MEM_TO_DEV,
+ rspi_pd->dma_tx_id,
+ res->start + RSPI_SPDR);
+ if (!master->dma_tx) {
+ dma_release_channel(master->dma_rx);
+ master->dma_rx = NULL;
+ return -ENODEV;
+ }
+
+ master->can_dma = rspi_can_dma;
+ dev_info(dev, "DMA available");
return 0;
}
static void rspi_release_dma(struct rspi_data *rspi)
{
- if (rspi->chan_tx)
- dma_release_channel(rspi->chan_tx);
- if (rspi->chan_rx)
- dma_release_channel(rspi->chan_rx);
+ if (rspi->master->dma_tx)
+ dma_release_channel(rspi->master->dma_tx);
+ if (rspi->master->dma_rx)
+ dma_release_channel(rspi->master->dma_rx);
}
static int rspi_remove(struct platform_device *pdev)
}
static const struct spi_ops rspi_ops = {
- .set_config_register = rspi_set_config_register,
- .transfer_one = rspi_transfer_one,
- .mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP,
+ .set_config_register = rspi_set_config_register,
+ .transfer_one = rspi_transfer_one,
+ .mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP,
+ .flags = SPI_MASTER_MUST_TX,
+ .fifo_size = 8,
};
static const struct spi_ops rspi_rz_ops = {
- .set_config_register = rspi_rz_set_config_register,
- .transfer_one = rspi_rz_transfer_one,
- .mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP,
+ .set_config_register = rspi_rz_set_config_register,
+ .transfer_one = rspi_rz_transfer_one,
+ .mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP,
+ .flags = SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX,
+ .fifo_size = 8, /* 8 for TX, 32 for RX */
};
static const struct spi_ops qspi_ops = {
- .set_config_register = qspi_set_config_register,
- .transfer_one = qspi_transfer_one,
- .mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP |
- SPI_TX_DUAL | SPI_TX_QUAD |
- SPI_RX_DUAL | SPI_RX_QUAD,
+ .set_config_register = qspi_set_config_register,
+ .transfer_one = qspi_transfer_one,
+ .mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP |
+ SPI_TX_DUAL | SPI_TX_QUAD |
+ SPI_RX_DUAL | SPI_RX_QUAD,
+ .flags = SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX,
+ .fifo_size = 32,
};
#ifdef CONFIG_OF
master->prepare_message = rspi_prepare_message;
master->unprepare_message = rspi_unprepare_message;
master->mode_bits = ops->mode_bits;
+ master->flags = ops->flags;
master->dev.of_node = pdev->dev.of_node;
ret = platform_get_irq_byname(pdev, "rx");
goto error2;
}
- ret = rspi_request_dma(rspi, pdev);
- if (ret < 0) {
- dev_err(&pdev->dev, "rspi_request_dma failed.\n");
- goto error3;
- }
+ ret = rspi_request_dma(&pdev->dev, master, res);
+ if (ret < 0)
+ dev_warn(&pdev->dev, "DMA not available, using PIO\n");
ret = devm_spi_register_master(&pdev->dev, master);
if (ret < 0) {
*/
#include <linux/spinlock.h>
-#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/errno.h>
/* allocate settings on the first call */
if (!cs) {
- cs = kzalloc(sizeof(struct s3c24xx_spi_devstate), GFP_KERNEL);
- if (!cs) {
- dev_err(&spi->dev, "no memory for controller state\n");
+ cs = devm_kzalloc(&spi->dev,
+ sizeof(struct s3c24xx_spi_devstate),
+ GFP_KERNEL);
+ if (!cs)
return -ENOMEM;
- }
cs->spcon = SPCON_DEFAULT;
cs->hz = -1;
return 0;
}
-static void s3c24xx_spi_cleanup(struct spi_device *spi)
-{
- kfree(spi->controller_state);
-}
-
static inline unsigned int hw_txbyte(struct s3c24xx_spi *hw, int count)
{
return hw->tx ? hw->tx[count] : 0;
hw->bitbang.txrx_bufs = s3c24xx_spi_txrx;
hw->master->setup = s3c24xx_spi_setup;
- hw->master->cleanup = s3c24xx_spi_cleanup;
dev_dbg(hw->dev, "bitbang at %p\n", &hw->bitbang);
#include <linux/init.h>
#include <linux/module.h>
-#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/clk.h>
cs = kzalloc(sizeof(*cs), GFP_KERNEL);
if (!cs) {
- dev_err(&spi->dev, "could not allocate memory for controller data\n");
of_node_put(data_np);
return ERR_PTR(-ENOMEM);
}
u32 temp;
sci = devm_kzalloc(dev, sizeof(*sci), GFP_KERNEL);
- if (!sci) {
- dev_err(dev, "memory allocation for spi_info failed\n");
+ if (!sci)
return ERR_PTR(-ENOMEM);
- }
if (of_property_read_u32(dev->of_node, "samsung,spi-src-clk", &temp)) {
dev_warn(dev, "spi bus clock parent not specified, using clock at index 0 as parent\n");
u32 num_cs = 1;
info = devm_kzalloc(dev, sizeof(struct sh_msiof_spi_info), GFP_KERNEL);
- if (!info) {
- dev_err(dev, "failed to allocate setup data\n");
+ if (!info)
return NULL;
- }
/* Parse the MSIOF properties */
of_property_read_u32(np, "num-cs", &num_cs);
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
-#include <linux/workqueue.h>
#include <linux/platform_device.h>
#include <linux/spi/spi.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/clk.h>
+#include <linux/completion.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/of.h>
#define SIRFSOC_SPI_TX_DONE BIT(1)
#define SIRFSOC_SPI_RX_OFLOW BIT(2)
#define SIRFSOC_SPI_TX_UFLOW BIT(3)
+#define SIRFSOC_SPI_RX_IO_DMA BIT(4)
#define SIRFSOC_SPI_RX_FIFO_FULL BIT(6)
#define SIRFSOC_SPI_TXFIFO_EMPTY BIT(7)
#define SIRFSOC_SPI_RXFIFO_THD_REACH BIT(8)
{
struct sirfsoc_spi *sspi = dev_id;
u32 spi_stat = readl(sspi->base + SIRFSOC_SPI_INT_STATUS);
-
- writel(spi_stat, sspi->base + SIRFSOC_SPI_INT_STATUS);
-
if (sspi->tx_by_cmd && (spi_stat & SIRFSOC_SPI_FRM_END)) {
complete(&sspi->tx_done);
writel(0x0, sspi->base + SIRFSOC_SPI_INT_EN);
+ writel(SIRFSOC_SPI_INT_MASK_ALL,
+ sspi->base + SIRFSOC_SPI_INT_STATUS);
return IRQ_HANDLED;
}
/* Error Conditions */
if (spi_stat & SIRFSOC_SPI_RX_OFLOW ||
spi_stat & SIRFSOC_SPI_TX_UFLOW) {
+ complete(&sspi->tx_done);
complete(&sspi->rx_done);
writel(0x0, sspi->base + SIRFSOC_SPI_INT_EN);
+ writel(SIRFSOC_SPI_INT_MASK_ALL,
+ sspi->base + SIRFSOC_SPI_INT_STATUS);
+ return IRQ_HANDLED;
}
+ if (spi_stat & SIRFSOC_SPI_TXFIFO_EMPTY)
+ complete(&sspi->tx_done);
+ while (!(readl(sspi->base + SIRFSOC_SPI_INT_STATUS) &
+ SIRFSOC_SPI_RX_IO_DMA))
+ cpu_relax();
+ complete(&sspi->rx_done);
+ writel(0x0, sspi->base + SIRFSOC_SPI_INT_EN);
+ writel(SIRFSOC_SPI_INT_MASK_ALL,
+ sspi->base + SIRFSOC_SPI_INT_STATUS);
- if (spi_stat & (SIRFSOC_SPI_FRM_END
- | SIRFSOC_SPI_RXFIFO_THD_REACH))
- while (!((readl(sspi->base + SIRFSOC_SPI_RXFIFO_STATUS)
- & SIRFSOC_SPI_FIFO_EMPTY)) &&
- sspi->left_rx_word)
- sspi->rx_word(sspi);
-
- if (spi_stat & (SIRFSOC_SPI_TXFIFO_EMPTY |
- SIRFSOC_SPI_TXFIFO_THD_REACH))
- while (!((readl(sspi->base + SIRFSOC_SPI_TXFIFO_STATUS)
- & SIRFSOC_SPI_FIFO_FULL)) &&
- sspi->left_tx_word)
- sspi->tx_word(sspi);
-
- /* Received all words */
- if ((sspi->left_rx_word == 0) && (sspi->left_tx_word == 0)) {
- complete(&sspi->rx_done);
- writel(0x0, sspi->base + SIRFSOC_SPI_INT_EN);
- }
return IRQ_HANDLED;
}
complete(dma_complete);
}
-static int spi_sirfsoc_transfer(struct spi_device *spi, struct spi_transfer *t)
+static int spi_sirfsoc_cmd_transfer(struct spi_device *spi,
+ struct spi_transfer *t)
{
struct sirfsoc_spi *sspi;
int timeout = t->len * 10;
- sspi = spi_master_get_devdata(spi->master);
+ u32 cmd;
- sspi->tx = t->tx_buf ? t->tx_buf : sspi->dummypage;
- sspi->rx = t->rx_buf ? t->rx_buf : sspi->dummypage;
- sspi->left_tx_word = sspi->left_rx_word = t->len / sspi->word_width;
- reinit_completion(&sspi->rx_done);
- reinit_completion(&sspi->tx_done);
-
- writel(SIRFSOC_SPI_INT_MASK_ALL, sspi->base + SIRFSOC_SPI_INT_STATUS);
-
- /*
- * fill tx_buf into command register and wait for its completion
- */
- if (sspi->tx_by_cmd) {
- u32 cmd;
- memcpy(&cmd, sspi->tx, t->len);
-
- if (sspi->word_width == 1 && !(spi->mode & SPI_LSB_FIRST))
- cmd = cpu_to_be32(cmd) >>
- ((SIRFSOC_MAX_CMD_BYTES - t->len) * 8);
- if (sspi->word_width == 2 && t->len == 4 &&
- (!(spi->mode & SPI_LSB_FIRST)))
- cmd = ((cmd & 0xffff) << 16) | (cmd >> 16);
-
- writel(cmd, sspi->base + SIRFSOC_SPI_CMD);
- writel(SIRFSOC_SPI_FRM_END_INT_EN,
- sspi->base + SIRFSOC_SPI_INT_EN);
- writel(SIRFSOC_SPI_CMD_TX_EN,
- sspi->base + SIRFSOC_SPI_TX_RX_EN);
+ sspi = spi_master_get_devdata(spi->master);
+ memcpy(&cmd, sspi->tx, t->len);
+ if (sspi->word_width == 1 && !(spi->mode & SPI_LSB_FIRST))
+ cmd = cpu_to_be32(cmd) >>
+ ((SIRFSOC_MAX_CMD_BYTES - t->len) * 8);
+ if (sspi->word_width == 2 && t->len == 4 &&
+ (!(spi->mode & SPI_LSB_FIRST)))
+ cmd = ((cmd & 0xffff) << 16) | (cmd >> 16);
+ writel(cmd, sspi->base + SIRFSOC_SPI_CMD);
+ writel(SIRFSOC_SPI_FRM_END_INT_EN,
+ sspi->base + SIRFSOC_SPI_INT_EN);
+ writel(SIRFSOC_SPI_CMD_TX_EN,
+ sspi->base + SIRFSOC_SPI_TX_RX_EN);
+ if (wait_for_completion_timeout(&sspi->tx_done, timeout) == 0) {
+ dev_err(&spi->dev, "cmd transfer timeout\n");
+ return 0;
+ }
- if (wait_for_completion_timeout(&sspi->tx_done, timeout) == 0) {
- dev_err(&spi->dev, "transfer timeout\n");
- return 0;
- }
+ return t->len;
+}
- return t->len;
- }
+static void spi_sirfsoc_dma_transfer(struct spi_device *spi,
+ struct spi_transfer *t)
+{
+ struct sirfsoc_spi *sspi;
+ struct dma_async_tx_descriptor *rx_desc, *tx_desc;
+ int timeout = t->len * 10;
- if (sspi->left_tx_word == 1) {
- writel(readl(sspi->base + SIRFSOC_SPI_CTRL) |
- SIRFSOC_SPI_ENA_AUTO_CLR,
- sspi->base + SIRFSOC_SPI_CTRL);
- writel(0, sspi->base + SIRFSOC_SPI_TX_DMA_IO_LEN);
- writel(0, sspi->base + SIRFSOC_SPI_RX_DMA_IO_LEN);
- } else if ((sspi->left_tx_word > 1) && (sspi->left_tx_word <
- SIRFSOC_SPI_DAT_FRM_LEN_MAX)) {
+ sspi = spi_master_get_devdata(spi->master);
+ writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + SIRFSOC_SPI_RXFIFO_OP);
+ writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + SIRFSOC_SPI_TXFIFO_OP);
+ writel(SIRFSOC_SPI_FIFO_START, sspi->base + SIRFSOC_SPI_RXFIFO_OP);
+ writel(SIRFSOC_SPI_FIFO_START, sspi->base + SIRFSOC_SPI_TXFIFO_OP);
+ writel(0, sspi->base + SIRFSOC_SPI_INT_EN);
+ writel(SIRFSOC_SPI_INT_MASK_ALL, sspi->base + SIRFSOC_SPI_INT_STATUS);
+ if (sspi->left_tx_word < SIRFSOC_SPI_DAT_FRM_LEN_MAX) {
writel(readl(sspi->base + SIRFSOC_SPI_CTRL) |
- SIRFSOC_SPI_MUL_DAT_MODE |
- SIRFSOC_SPI_ENA_AUTO_CLR,
+ SIRFSOC_SPI_ENA_AUTO_CLR | SIRFSOC_SPI_MUL_DAT_MODE,
sspi->base + SIRFSOC_SPI_CTRL);
writel(sspi->left_tx_word - 1,
sspi->base + SIRFSOC_SPI_TX_DMA_IO_LEN);
writel(0, sspi->base + SIRFSOC_SPI_TX_DMA_IO_LEN);
writel(0, sspi->base + SIRFSOC_SPI_RX_DMA_IO_LEN);
}
-
- writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + SIRFSOC_SPI_RXFIFO_OP);
- writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + SIRFSOC_SPI_TXFIFO_OP);
- writel(SIRFSOC_SPI_FIFO_START, sspi->base + SIRFSOC_SPI_RXFIFO_OP);
- writel(SIRFSOC_SPI_FIFO_START, sspi->base + SIRFSOC_SPI_TXFIFO_OP);
-
- if (IS_DMA_VALID(t)) {
- struct dma_async_tx_descriptor *rx_desc, *tx_desc;
-
- sspi->dst_start = dma_map_single(&spi->dev, sspi->rx, t->len, DMA_FROM_DEVICE);
- rx_desc = dmaengine_prep_slave_single(sspi->rx_chan,
- sspi->dst_start, t->len, DMA_DEV_TO_MEM,
- DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
- rx_desc->callback = spi_sirfsoc_dma_fini_callback;
- rx_desc->callback_param = &sspi->rx_done;
-
- sspi->src_start = dma_map_single(&spi->dev, (void *)sspi->tx, t->len, DMA_TO_DEVICE);
- tx_desc = dmaengine_prep_slave_single(sspi->tx_chan,
- sspi->src_start, t->len, DMA_MEM_TO_DEV,
- DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
- tx_desc->callback = spi_sirfsoc_dma_fini_callback;
- tx_desc->callback_param = &sspi->tx_done;
-
- dmaengine_submit(tx_desc);
- dmaengine_submit(rx_desc);
- dma_async_issue_pending(sspi->tx_chan);
- dma_async_issue_pending(sspi->rx_chan);
- } else {
- /* Send the first word to trigger the whole tx/rx process */
- sspi->tx_word(sspi);
-
- writel(SIRFSOC_SPI_RX_OFLOW_INT_EN | SIRFSOC_SPI_TX_UFLOW_INT_EN |
- SIRFSOC_SPI_RXFIFO_THD_INT_EN | SIRFSOC_SPI_TXFIFO_THD_INT_EN |
- SIRFSOC_SPI_FRM_END_INT_EN | SIRFSOC_SPI_RXFIFO_FULL_INT_EN |
- SIRFSOC_SPI_TXFIFO_EMPTY_INT_EN, sspi->base + SIRFSOC_SPI_INT_EN);
- }
-
- writel(SIRFSOC_SPI_RX_EN | SIRFSOC_SPI_TX_EN, sspi->base + SIRFSOC_SPI_TX_RX_EN);
-
- if (!IS_DMA_VALID(t)) { /* for PIO */
- if (wait_for_completion_timeout(&sspi->rx_done, timeout) == 0)
- dev_err(&spi->dev, "transfer timeout\n");
- } else if (wait_for_completion_timeout(&sspi->rx_done, timeout) == 0) {
+ sspi->dst_start = dma_map_single(&spi->dev, sspi->rx, t->len,
+ (t->tx_buf != t->rx_buf) ?
+ DMA_FROM_DEVICE : DMA_BIDIRECTIONAL);
+ rx_desc = dmaengine_prep_slave_single(sspi->rx_chan,
+ sspi->dst_start, t->len, DMA_DEV_TO_MEM,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ rx_desc->callback = spi_sirfsoc_dma_fini_callback;
+ rx_desc->callback_param = &sspi->rx_done;
+
+ sspi->src_start = dma_map_single(&spi->dev, (void *)sspi->tx, t->len,
+ (t->tx_buf != t->rx_buf) ?
+ DMA_TO_DEVICE : DMA_BIDIRECTIONAL);
+ tx_desc = dmaengine_prep_slave_single(sspi->tx_chan,
+ sspi->src_start, t->len, DMA_MEM_TO_DEV,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ tx_desc->callback = spi_sirfsoc_dma_fini_callback;
+ tx_desc->callback_param = &sspi->tx_done;
+
+ dmaengine_submit(tx_desc);
+ dmaengine_submit(rx_desc);
+ dma_async_issue_pending(sspi->tx_chan);
+ dma_async_issue_pending(sspi->rx_chan);
+ writel(SIRFSOC_SPI_RX_EN | SIRFSOC_SPI_TX_EN,
+ sspi->base + SIRFSOC_SPI_TX_RX_EN);
+ if (wait_for_completion_timeout(&sspi->rx_done, timeout) == 0) {
dev_err(&spi->dev, "transfer timeout\n");
dmaengine_terminate_all(sspi->rx_chan);
} else
sspi->left_rx_word = 0;
-
/*
* we only wait tx-done event if transferring by DMA. for PIO,
* we get rx data by writing tx data, so if rx is done, tx has
* done earlier
*/
- if (IS_DMA_VALID(t)) {
- if (wait_for_completion_timeout(&sspi->tx_done, timeout) == 0) {
- dev_err(&spi->dev, "transfer timeout\n");
- dmaengine_terminate_all(sspi->tx_chan);
- }
- }
-
- if (IS_DMA_VALID(t)) {
- dma_unmap_single(&spi->dev, sspi->src_start, t->len, DMA_TO_DEVICE);
- dma_unmap_single(&spi->dev, sspi->dst_start, t->len, DMA_FROM_DEVICE);
+ if (wait_for_completion_timeout(&sspi->tx_done, timeout) == 0) {
+ dev_err(&spi->dev, "transfer timeout\n");
+ dmaengine_terminate_all(sspi->tx_chan);
}
-
+ dma_unmap_single(&spi->dev, sspi->src_start, t->len, DMA_TO_DEVICE);
+ dma_unmap_single(&spi->dev, sspi->dst_start, t->len, DMA_FROM_DEVICE);
/* TX, RX FIFO stop */
writel(0, sspi->base + SIRFSOC_SPI_RXFIFO_OP);
writel(0, sspi->base + SIRFSOC_SPI_TXFIFO_OP);
- writel(0, sspi->base + SIRFSOC_SPI_TX_RX_EN);
- writel(0, sspi->base + SIRFSOC_SPI_INT_EN);
+ if (sspi->left_tx_word >= SIRFSOC_SPI_DAT_FRM_LEN_MAX)
+ writel(0, sspi->base + SIRFSOC_SPI_TX_RX_EN);
+}
+
+static void spi_sirfsoc_pio_transfer(struct spi_device *spi,
+ struct spi_transfer *t)
+{
+ struct sirfsoc_spi *sspi;
+ int timeout = t->len * 10;
+
+ sspi = spi_master_get_devdata(spi->master);
+ do {
+ writel(SIRFSOC_SPI_FIFO_RESET,
+ sspi->base + SIRFSOC_SPI_RXFIFO_OP);
+ writel(SIRFSOC_SPI_FIFO_RESET,
+ sspi->base + SIRFSOC_SPI_TXFIFO_OP);
+ writel(SIRFSOC_SPI_FIFO_START,
+ sspi->base + SIRFSOC_SPI_RXFIFO_OP);
+ writel(SIRFSOC_SPI_FIFO_START,
+ sspi->base + SIRFSOC_SPI_TXFIFO_OP);
+ writel(0, sspi->base + SIRFSOC_SPI_INT_EN);
+ writel(SIRFSOC_SPI_INT_MASK_ALL,
+ sspi->base + SIRFSOC_SPI_INT_STATUS);
+ writel(readl(sspi->base + SIRFSOC_SPI_CTRL) |
+ SIRFSOC_SPI_MUL_DAT_MODE | SIRFSOC_SPI_ENA_AUTO_CLR,
+ sspi->base + SIRFSOC_SPI_CTRL);
+ writel(min(sspi->left_tx_word, (u32)(256 / sspi->word_width))
+ - 1, sspi->base + SIRFSOC_SPI_TX_DMA_IO_LEN);
+ writel(min(sspi->left_rx_word, (u32)(256 / sspi->word_width))
+ - 1, sspi->base + SIRFSOC_SPI_RX_DMA_IO_LEN);
+ while (!((readl(sspi->base + SIRFSOC_SPI_TXFIFO_STATUS)
+ & SIRFSOC_SPI_FIFO_FULL)) && sspi->left_tx_word)
+ sspi->tx_word(sspi);
+ writel(SIRFSOC_SPI_TXFIFO_EMPTY_INT_EN |
+ SIRFSOC_SPI_TX_UFLOW_INT_EN |
+ SIRFSOC_SPI_RX_OFLOW_INT_EN,
+ sspi->base + SIRFSOC_SPI_INT_EN);
+ writel(SIRFSOC_SPI_RX_EN | SIRFSOC_SPI_TX_EN,
+ sspi->base + SIRFSOC_SPI_TX_RX_EN);
+ if (!wait_for_completion_timeout(&sspi->tx_done, timeout) ||
+ !wait_for_completion_timeout(&sspi->rx_done, timeout)) {
+ dev_err(&spi->dev, "transfer timeout\n");
+ break;
+ }
+ while (!((readl(sspi->base + SIRFSOC_SPI_RXFIFO_STATUS)
+ & SIRFSOC_SPI_FIFO_EMPTY)) && sspi->left_rx_word)
+ sspi->rx_word(sspi);
+ writel(0, sspi->base + SIRFSOC_SPI_RXFIFO_OP);
+ writel(0, sspi->base + SIRFSOC_SPI_TXFIFO_OP);
+ } while (sspi->left_tx_word != 0 || sspi->left_rx_word != 0);
+}
+
+static int spi_sirfsoc_transfer(struct spi_device *spi, struct spi_transfer *t)
+{
+ struct sirfsoc_spi *sspi;
+ sspi = spi_master_get_devdata(spi->master);
+
+ sspi->tx = t->tx_buf ? t->tx_buf : sspi->dummypage;
+ sspi->rx = t->rx_buf ? t->rx_buf : sspi->dummypage;
+ sspi->left_tx_word = sspi->left_rx_word = t->len / sspi->word_width;
+ reinit_completion(&sspi->rx_done);
+ reinit_completion(&sspi->tx_done);
+ /*
+ * in the transfer, if transfer data using command register with rx_buf
+ * null, just fill command data into command register and wait for its
+ * completion.
+ */
+ if (sspi->tx_by_cmd)
+ spi_sirfsoc_cmd_transfer(spi, t);
+ else if (IS_DMA_VALID(t))
+ spi_sirfsoc_dma_transfer(spi, t);
+ else
+ spi_sirfsoc_pio_transfer(spi, t);
return t->len - sspi->left_rx_word * sspi->word_width;
}
break;
case 12:
case 16:
- regval |= (bits_per_word == 12) ? SIRFSOC_SPI_TRAN_DAT_FORMAT_12 :
+ regval |= (bits_per_word == 12) ?
+ SIRFSOC_SPI_TRAN_DAT_FORMAT_12 :
SIRFSOC_SPI_TRAN_DAT_FORMAT_16;
sspi->rx_word = spi_sirfsoc_rx_word_u16;
sspi->tx_word = spi_sirfsoc_tx_word_u16;
regval |= SIRFSOC_SPI_CLK_IDLE_STAT;
/*
- * Data should be driven at least 1/2 cycle before the fetch edge to make
- * sure that data gets stable at the fetch edge.
+ * Data should be driven at least 1/2 cycle before the fetch edge
+ * to make sure that data gets stable at the fetch edge.
*/
if (((spi->mode & SPI_CPOL) && (spi->mode & SPI_CPHA)) ||
(!(spi->mode & SPI_CPOL) && !(spi->mode & SPI_CPHA)))
if (IS_DMA_VALID(t)) {
/* Enable DMA mode for RX, TX */
writel(0, sspi->base + SIRFSOC_SPI_TX_DMA_IO_CTRL);
- writel(SIRFSOC_SPI_RX_DMA_FLUSH, sspi->base + SIRFSOC_SPI_RX_DMA_IO_CTRL);
+ writel(SIRFSOC_SPI_RX_DMA_FLUSH,
+ sspi->base + SIRFSOC_SPI_RX_DMA_IO_CTRL);
} else {
/* Enable IO mode for RX, TX */
- writel(SIRFSOC_SPI_IO_MODE_SEL, sspi->base + SIRFSOC_SPI_TX_DMA_IO_CTRL);
- writel(SIRFSOC_SPI_IO_MODE_SEL, sspi->base + SIRFSOC_SPI_RX_DMA_IO_CTRL);
+ writel(SIRFSOC_SPI_IO_MODE_SEL,
+ sspi->base + SIRFSOC_SPI_TX_DMA_IO_CTRL);
+ writel(SIRFSOC_SPI_IO_MODE_SEL,
+ sspi->base + SIRFSOC_SPI_RX_DMA_IO_CTRL);
}
return 0;
goto err_cs;
}
- master = spi_alloc_master(&pdev->dev, sizeof(*sspi) + sizeof(int) * num_cs);
+ master = spi_alloc_master(&pdev->dev,
+ sizeof(*sspi) + sizeof(int) * num_cs);
if (!master) {
dev_err(&pdev->dev, "Unable to allocate SPI master\n");
return -ENOMEM;
.remove = spi_sirfsoc_remove,
};
module_platform_driver(spi_sirfsoc_driver);
-
MODULE_DESCRIPTION("SiRF SoC SPI master driver");
-MODULE_AUTHOR("Zhiwu Song <Zhiwu.Song@csr.com>, "
- "Barry Song <Baohua.Song@csr.com>");
+MODULE_AUTHOR("Zhiwu Song <Zhiwu.Song@csr.com>");
+MODULE_AUTHOR("Barry Song <Baohua.Song@csr.com>");
MODULE_LICENSE("GPL v2");
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
-#include <linux/workqueue.h>
#include <linux/spi/spi.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
-#include <linux/workqueue.h>
#include <linux/spi/spi.h>
return IRQ_WAKE_THREAD;
}
-static struct of_device_id tegra_spi_of_match[] = {
+static const struct of_device_id tegra_spi_of_match[] = {
{ .compatible = "nvidia,tegra114-spi", },
{}
};
return handle_cpu_based_xfer(tsd);
}
-static struct of_device_id tegra_sflash_of_match[] = {
+static const struct of_device_id tegra_sflash_of_match[] = {
{ .compatible = "nvidia,tegra20-sflash", },
{}
};
.cs_hold_time = false,
};
-static struct of_device_id tegra_slink_of_match[] = {
+static const struct of_device_id tegra_slink_of_match[] = {
{ .compatible = "nvidia,tegra30-slink", .data = &tegra30_spi_cdata, },
{ .compatible = "nvidia,tegra20-slink", .data = &tegra20_spi_cdata, },
{}
}
st = kzalloc(sizeof(struct tle62x0_state), GFP_KERNEL);
- if (st == NULL) {
- dev_err(&spi->dev, "no memory for device state\n");
+ if (st == NULL)
return -ENOMEM;
- }
st->us = spi;
st->nr_gpio = pdata->gpio_count;
struct pch_pd_dev_save *pd_dev_save;
pd_dev_save = kzalloc(sizeof(struct pch_pd_dev_save), GFP_KERNEL);
- if (!pd_dev_save) {
- dev_err(&pdev->dev, "%s Can't allocate pd_dev_sav\n", __func__);
+ if (!pd_dev_save)
return -ENOMEM;
- }
board_dat = kzalloc(sizeof(struct pch_spi_board_data), GFP_KERNEL);
if (!board_dat) {
- dev_err(&pdev->dev, "%s Can't allocate board_dat\n", __func__);
retval = -ENOMEM;
goto err_no_mem;
}
if (ret > 0) {
ret = 0;
ms = xfer->len * 8 * 1000 / xfer->speed_hz;
- ms += 10; /* some tolerance */
+ ms += ms + 100; /* some tolerance */
ms = wait_for_completion_timeout(&master->xfer_completion,
msecs_to_jiffies(ms));
spi->mode |= SPI_CS_HIGH;
if (of_find_property(nc, "spi-3wire", NULL))
spi->mode |= SPI_3WIRE;
+ if (of_find_property(nc, "spi-lsb-first", NULL))
+ spi->mode |= SPI_LSB_FIRST;
/* Device DUAL/QUAD mode */
if (!of_property_read_u32(nc, "spi-tx-bus-width", &value)) {
spi->mode |= SPI_TX_QUAD;
break;
default:
- dev_err(&master->dev,
- "spi-tx-bus-width %d not supported\n",
- value);
- spi_dev_put(spi);
- continue;
+ dev_warn(&master->dev,
+ "spi-tx-bus-width %d not supported\n",
+ value);
+ break;
}
}
spi->mode |= SPI_RX_QUAD;
break;
default:
- dev_err(&master->dev,
- "spi-rx-bus-width %d not supported\n",
- value);
- spi_dev_put(spi);
- continue;
+ dev_warn(&master->dev,
+ "spi-rx-bus-width %d not supported\n",
+ value);
+ break;
}
}
/*
* Analog Devices SPI3 controller driver
*
- * Copyright (c) 2011 Analog Devices Inc.
+ * Copyright (c) 2014 Analog Devices Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
-#ifndef _SPI_CHANNEL_H_
-#define _SPI_CHANNEL_H_
+#ifndef _ADI_SPI3_H_
+#define _ADI_SPI3_H_
#include <linux/types.h>
#define SPI_ILAT_CLR_TFI 0x00000800 /* Transmit Finish Indication */
/*
- * bfin spi3 registers layout
+ * adi spi3 registers layout
*/
-struct bfin_spi_regs {
+struct adi_spi_regs {
u32 revid;
u32 control;
u32 rx_control;
#define MAX_CTRL_CS 8 /* cs in spi controller */
/* device.platform_data for SSP controller devices */
-struct bfin_spi3_master {
+struct adi_spi3_master {
u16 num_chipselect;
u16 pin_req[7];
};
/* spi_board_info.controller_data for SPI slave devices,
* copied to spi_device.platform_data ... mostly for dma tuning
*/
-struct bfin_spi3_chip {
+struct adi_spi3_chip {
u32 control;
u16 cs_chg_udelay; /* Some devices require 16-bit delays */
u32 tx_dummy_val; /* tx value for rx only transfer */
bool enable_dma;
};
-#endif /* _SPI_CHANNEL_H_ */
+#endif /* _ADI_SPI3_H_ */
unsigned int dma_tx_id;
unsigned int dma_rx_id;
- unsigned dma_width_16bit:1; /* DMAC read/write width = 16-bit */
-
u16 num_chipselect;
};
projects / linux.git / commitdiff