2 * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
3 * Copyright (C) 2013, Intel Corporation
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
16 #include <linux/bitops.h>
17 #include <linux/init.h>
18 #include <linux/module.h>
19 #include <linux/device.h>
20 #include <linux/ioport.h>
21 #include <linux/errno.h>
22 #include <linux/err.h>
23 #include <linux/interrupt.h>
24 #include <linux/kernel.h>
25 #include <linux/pci.h>
26 #include <linux/platform_device.h>
27 #include <linux/spi/pxa2xx_spi.h>
28 #include <linux/spi/spi.h>
29 #include <linux/delay.h>
30 #include <linux/gpio.h>
31 #include <linux/slab.h>
32 #include <linux/clk.h>
33 #include <linux/pm_runtime.h>
34 #include <linux/acpi.h>
36 #include "spi-pxa2xx.h"
38 MODULE_AUTHOR("Stephen Street");
39 MODULE_DESCRIPTION("PXA2xx SSP SPI Controller");
40 MODULE_LICENSE("GPL");
41 MODULE_ALIAS("platform:pxa2xx-spi");
43 #define TIMOUT_DFLT 1000
46 * for testing SSCR1 changes that require SSP restart, basically
47 * everything except the service and interrupt enables, the pxa270 developer
48 * manual says only SSCR1_SCFR, SSCR1_SPH, SSCR1_SPO need to be in this
49 * list, but the PXA255 dev man says all bits without really meaning the
50 * service and interrupt enables
52 #define SSCR1_CHANGE_MASK (SSCR1_TTELP | SSCR1_TTE | SSCR1_SCFR \
53 | SSCR1_ECRA | SSCR1_ECRB | SSCR1_SCLKDIR \
54 | SSCR1_SFRMDIR | SSCR1_RWOT | SSCR1_TRAIL \
55 | SSCR1_IFS | SSCR1_STRF | SSCR1_EFWR \
56 | SSCR1_RFT | SSCR1_TFT | SSCR1_MWDS \
57 | SSCR1_SPH | SSCR1_SPO | SSCR1_LBM)
59 #define QUARK_X1000_SSCR1_CHANGE_MASK (QUARK_X1000_SSCR1_STRF \
60 | QUARK_X1000_SSCR1_EFWR \
61 | QUARK_X1000_SSCR1_RFT \
62 | QUARK_X1000_SSCR1_TFT \
63 | SSCR1_SPH | SSCR1_SPO | SSCR1_LBM)
65 #define LPSS_GENERAL_REG_RXTO_HOLDOFF_DISABLE BIT(24)
66 #define LPSS_CS_CONTROL_SW_MODE BIT(0)
67 #define LPSS_CS_CONTROL_CS_HIGH BIT(1)
68 #define LPSS_CS_CONTROL_CS_SEL_SHIFT 8
69 #define LPSS_CS_CONTROL_CS_SEL_MASK (3 << LPSS_CS_CONTROL_CS_SEL_SHIFT)
70 #define LPSS_CAPS_CS_EN_SHIFT 9
71 #define LPSS_CAPS_CS_EN_MASK (0xf << LPSS_CAPS_CS_EN_SHIFT)
74 /* LPSS offset from drv_data->ioaddr */
76 /* Register offsets from drv_data->lpss_base or -1 */
87 /* Keep these sorted with enum pxa_ssp_type */
88 static const struct lpss_config lpss_platforms[] = {
94 .reg_capabilities = -1,
96 .tx_threshold_lo = 160,
97 .tx_threshold_hi = 224,
104 .reg_capabilities = -1,
106 .tx_threshold_lo = 160,
107 .tx_threshold_hi = 224,
114 .reg_capabilities = 0xfc,
116 .tx_threshold_lo = 32,
117 .tx_threshold_hi = 56,
121 static inline const struct lpss_config
122 *lpss_get_config(const struct driver_data *drv_data)
124 return &lpss_platforms[drv_data->ssp_type - LPSS_LPT_SSP];
127 static bool is_lpss_ssp(const struct driver_data *drv_data)
129 switch (drv_data->ssp_type) {
139 static bool is_quark_x1000_ssp(const struct driver_data *drv_data)
141 return drv_data->ssp_type == QUARK_X1000_SSP;
144 static u32 pxa2xx_spi_get_ssrc1_change_mask(const struct driver_data *drv_data)
146 switch (drv_data->ssp_type) {
147 case QUARK_X1000_SSP:
148 return QUARK_X1000_SSCR1_CHANGE_MASK;
150 return SSCR1_CHANGE_MASK;
155 pxa2xx_spi_get_rx_default_thre(const struct driver_data *drv_data)
157 switch (drv_data->ssp_type) {
158 case QUARK_X1000_SSP:
159 return RX_THRESH_QUARK_X1000_DFLT;
161 return RX_THRESH_DFLT;
165 static bool pxa2xx_spi_txfifo_full(const struct driver_data *drv_data)
169 switch (drv_data->ssp_type) {
170 case QUARK_X1000_SSP:
171 mask = QUARK_X1000_SSSR_TFL_MASK;
174 mask = SSSR_TFL_MASK;
178 return (pxa2xx_spi_read(drv_data, SSSR) & mask) == mask;
181 static void pxa2xx_spi_clear_rx_thre(const struct driver_data *drv_data,
186 switch (drv_data->ssp_type) {
187 case QUARK_X1000_SSP:
188 mask = QUARK_X1000_SSCR1_RFT;
197 static void pxa2xx_spi_set_rx_thre(const struct driver_data *drv_data,
198 u32 *sccr1_reg, u32 threshold)
200 switch (drv_data->ssp_type) {
201 case QUARK_X1000_SSP:
202 *sccr1_reg |= QUARK_X1000_SSCR1_RxTresh(threshold);
205 *sccr1_reg |= SSCR1_RxTresh(threshold);
210 static u32 pxa2xx_configure_sscr0(const struct driver_data *drv_data,
211 u32 clk_div, u8 bits)
213 switch (drv_data->ssp_type) {
214 case QUARK_X1000_SSP:
216 | QUARK_X1000_SSCR0_Motorola
217 | QUARK_X1000_SSCR0_DataSize(bits > 32 ? 8 : bits)
222 | SSCR0_DataSize(bits > 16 ? bits - 16 : bits)
224 | (bits > 16 ? SSCR0_EDSS : 0);
229 * Read and write LPSS SSP private registers. Caller must first check that
230 * is_lpss_ssp() returns true before these can be called.
232 static u32 __lpss_ssp_read_priv(struct driver_data *drv_data, unsigned offset)
234 WARN_ON(!drv_data->lpss_base);
235 return readl(drv_data->lpss_base + offset);
238 static void __lpss_ssp_write_priv(struct driver_data *drv_data,
239 unsigned offset, u32 value)
241 WARN_ON(!drv_data->lpss_base);
242 writel(value, drv_data->lpss_base + offset);
246 * lpss_ssp_setup - perform LPSS SSP specific setup
247 * @drv_data: pointer to the driver private data
249 * Perform LPSS SSP specific setup. This function must be called first if
250 * one is going to use LPSS SSP private registers.
252 static void lpss_ssp_setup(struct driver_data *drv_data)
254 const struct lpss_config *config;
257 config = lpss_get_config(drv_data);
258 drv_data->lpss_base = drv_data->ioaddr + config->offset;
260 /* Enable software chip select control */
261 value = __lpss_ssp_read_priv(drv_data, config->reg_cs_ctrl);
262 value &= ~(LPSS_CS_CONTROL_SW_MODE | LPSS_CS_CONTROL_CS_HIGH);
263 value |= LPSS_CS_CONTROL_SW_MODE | LPSS_CS_CONTROL_CS_HIGH;
264 __lpss_ssp_write_priv(drv_data, config->reg_cs_ctrl, value);
266 /* Enable multiblock DMA transfers */
267 if (drv_data->master_info->enable_dma) {
268 __lpss_ssp_write_priv(drv_data, config->reg_ssp, 1);
270 if (config->reg_general >= 0) {
271 value = __lpss_ssp_read_priv(drv_data,
272 config->reg_general);
273 value |= LPSS_GENERAL_REG_RXTO_HOLDOFF_DISABLE;
274 __lpss_ssp_write_priv(drv_data,
275 config->reg_general, value);
280 static void lpss_ssp_cs_control(struct driver_data *drv_data, bool enable)
282 const struct lpss_config *config;
285 config = lpss_get_config(drv_data);
287 value = __lpss_ssp_read_priv(drv_data, config->reg_cs_ctrl);
289 cs = drv_data->cur_msg->spi->chip_select;
290 cs <<= LPSS_CS_CONTROL_CS_SEL_SHIFT;
291 if (cs != (value & LPSS_CS_CONTROL_CS_SEL_MASK)) {
293 * When switching another chip select output active
294 * the output must be selected first and wait 2 ssp_clk
295 * cycles before changing state to active. Otherwise
296 * a short glitch will occur on the previous chip
297 * select since output select is latched but state
300 value &= ~LPSS_CS_CONTROL_CS_SEL_MASK;
302 __lpss_ssp_write_priv(drv_data,
303 config->reg_cs_ctrl, value);
305 (drv_data->master->max_speed_hz / 2));
307 value &= ~LPSS_CS_CONTROL_CS_HIGH;
309 value |= LPSS_CS_CONTROL_CS_HIGH;
311 __lpss_ssp_write_priv(drv_data, config->reg_cs_ctrl, value);
314 static void cs_assert(struct driver_data *drv_data)
316 struct chip_data *chip = drv_data->cur_chip;
318 if (drv_data->ssp_type == CE4100_SSP) {
319 pxa2xx_spi_write(drv_data, SSSR, drv_data->cur_chip->frm);
323 if (chip->cs_control) {
324 chip->cs_control(PXA2XX_CS_ASSERT);
328 if (gpio_is_valid(chip->gpio_cs)) {
329 gpio_set_value(chip->gpio_cs, chip->gpio_cs_inverted);
333 if (is_lpss_ssp(drv_data))
334 lpss_ssp_cs_control(drv_data, true);
337 static void cs_deassert(struct driver_data *drv_data)
339 struct chip_data *chip = drv_data->cur_chip;
341 if (drv_data->ssp_type == CE4100_SSP)
344 if (chip->cs_control) {
345 chip->cs_control(PXA2XX_CS_DEASSERT);
349 if (gpio_is_valid(chip->gpio_cs)) {
350 gpio_set_value(chip->gpio_cs, !chip->gpio_cs_inverted);
354 if (is_lpss_ssp(drv_data))
355 lpss_ssp_cs_control(drv_data, false);
358 int pxa2xx_spi_flush(struct driver_data *drv_data)
360 unsigned long limit = loops_per_jiffy << 1;
363 while (pxa2xx_spi_read(drv_data, SSSR) & SSSR_RNE)
364 pxa2xx_spi_read(drv_data, SSDR);
365 } while ((pxa2xx_spi_read(drv_data, SSSR) & SSSR_BSY) && --limit);
366 write_SSSR_CS(drv_data, SSSR_ROR);
371 static int null_writer(struct driver_data *drv_data)
373 u8 n_bytes = drv_data->n_bytes;
375 if (pxa2xx_spi_txfifo_full(drv_data)
376 || (drv_data->tx == drv_data->tx_end))
379 pxa2xx_spi_write(drv_data, SSDR, 0);
380 drv_data->tx += n_bytes;
385 static int null_reader(struct driver_data *drv_data)
387 u8 n_bytes = drv_data->n_bytes;
389 while ((pxa2xx_spi_read(drv_data, SSSR) & SSSR_RNE)
390 && (drv_data->rx < drv_data->rx_end)) {
391 pxa2xx_spi_read(drv_data, SSDR);
392 drv_data->rx += n_bytes;
395 return drv_data->rx == drv_data->rx_end;
398 static int u8_writer(struct driver_data *drv_data)
400 if (pxa2xx_spi_txfifo_full(drv_data)
401 || (drv_data->tx == drv_data->tx_end))
404 pxa2xx_spi_write(drv_data, SSDR, *(u8 *)(drv_data->tx));
410 static int u8_reader(struct driver_data *drv_data)
412 while ((pxa2xx_spi_read(drv_data, SSSR) & SSSR_RNE)
413 && (drv_data->rx < drv_data->rx_end)) {
414 *(u8 *)(drv_data->rx) = pxa2xx_spi_read(drv_data, SSDR);
418 return drv_data->rx == drv_data->rx_end;
421 static int u16_writer(struct driver_data *drv_data)
423 if (pxa2xx_spi_txfifo_full(drv_data)
424 || (drv_data->tx == drv_data->tx_end))
427 pxa2xx_spi_write(drv_data, SSDR, *(u16 *)(drv_data->tx));
433 static int u16_reader(struct driver_data *drv_data)
435 while ((pxa2xx_spi_read(drv_data, SSSR) & SSSR_RNE)
436 && (drv_data->rx < drv_data->rx_end)) {
437 *(u16 *)(drv_data->rx) = pxa2xx_spi_read(drv_data, SSDR);
441 return drv_data->rx == drv_data->rx_end;
444 static int u32_writer(struct driver_data *drv_data)
446 if (pxa2xx_spi_txfifo_full(drv_data)
447 || (drv_data->tx == drv_data->tx_end))
450 pxa2xx_spi_write(drv_data, SSDR, *(u32 *)(drv_data->tx));
456 static int u32_reader(struct driver_data *drv_data)
458 while ((pxa2xx_spi_read(drv_data, SSSR) & SSSR_RNE)
459 && (drv_data->rx < drv_data->rx_end)) {
460 *(u32 *)(drv_data->rx) = pxa2xx_spi_read(drv_data, SSDR);
464 return drv_data->rx == drv_data->rx_end;
467 void *pxa2xx_spi_next_transfer(struct driver_data *drv_data)
469 struct spi_message *msg = drv_data->cur_msg;
470 struct spi_transfer *trans = drv_data->cur_transfer;
472 /* Move to next transfer */
473 if (trans->transfer_list.next != &msg->transfers) {
474 drv_data->cur_transfer =
475 list_entry(trans->transfer_list.next,
478 return RUNNING_STATE;
483 /* caller already set message->status; dma and pio irqs are blocked */
484 static void giveback(struct driver_data *drv_data)
486 struct spi_transfer* last_transfer;
487 struct spi_message *msg;
489 msg = drv_data->cur_msg;
490 drv_data->cur_msg = NULL;
491 drv_data->cur_transfer = NULL;
493 last_transfer = list_last_entry(&msg->transfers, struct spi_transfer,
496 /* Delay if requested before any change in chip select */
497 if (last_transfer->delay_usecs)
498 udelay(last_transfer->delay_usecs);
500 /* Drop chip select UNLESS cs_change is true or we are returning
501 * a message with an error, or next message is for another chip
503 if (!last_transfer->cs_change)
504 cs_deassert(drv_data);
506 struct spi_message *next_msg;
508 /* Holding of cs was hinted, but we need to make sure
509 * the next message is for the same chip. Don't waste
510 * time with the following tests unless this was hinted.
512 * We cannot postpone this until pump_messages, because
513 * after calling msg->complete (below) the driver that
514 * sent the current message could be unloaded, which
515 * could invalidate the cs_control() callback...
518 /* get a pointer to the next message, if any */
519 next_msg = spi_get_next_queued_message(drv_data->master);
521 /* see if the next and current messages point
524 if (next_msg && next_msg->spi != msg->spi)
526 if (!next_msg || msg->state == ERROR_STATE)
527 cs_deassert(drv_data);
530 drv_data->cur_chip = NULL;
531 spi_finalize_current_message(drv_data->master);
534 static void reset_sccr1(struct driver_data *drv_data)
536 struct chip_data *chip = drv_data->cur_chip;
539 sccr1_reg = pxa2xx_spi_read(drv_data, SSCR1) & ~drv_data->int_cr1;
540 sccr1_reg &= ~SSCR1_RFT;
541 sccr1_reg |= chip->threshold;
542 pxa2xx_spi_write(drv_data, SSCR1, sccr1_reg);
545 static void int_error_stop(struct driver_data *drv_data, const char* msg)
547 /* Stop and reset SSP */
548 write_SSSR_CS(drv_data, drv_data->clear_sr);
549 reset_sccr1(drv_data);
550 if (!pxa25x_ssp_comp(drv_data))
551 pxa2xx_spi_write(drv_data, SSTO, 0);
552 pxa2xx_spi_flush(drv_data);
553 pxa2xx_spi_write(drv_data, SSCR0,
554 pxa2xx_spi_read(drv_data, SSCR0) & ~SSCR0_SSE);
556 dev_err(&drv_data->pdev->dev, "%s\n", msg);
558 drv_data->cur_msg->state = ERROR_STATE;
559 tasklet_schedule(&drv_data->pump_transfers);
562 static void int_transfer_complete(struct driver_data *drv_data)
565 write_SSSR_CS(drv_data, drv_data->clear_sr);
566 reset_sccr1(drv_data);
567 if (!pxa25x_ssp_comp(drv_data))
568 pxa2xx_spi_write(drv_data, SSTO, 0);
570 /* Update total byte transferred return count actual bytes read */
571 drv_data->cur_msg->actual_length += drv_data->len -
572 (drv_data->rx_end - drv_data->rx);
574 /* Transfer delays and chip select release are
575 * handled in pump_transfers or giveback
578 /* Move to next transfer */
579 drv_data->cur_msg->state = pxa2xx_spi_next_transfer(drv_data);
581 /* Schedule transfer tasklet */
582 tasklet_schedule(&drv_data->pump_transfers);
585 static irqreturn_t interrupt_transfer(struct driver_data *drv_data)
587 u32 irq_mask = (pxa2xx_spi_read(drv_data, SSCR1) & SSCR1_TIE) ?
588 drv_data->mask_sr : drv_data->mask_sr & ~SSSR_TFS;
590 u32 irq_status = pxa2xx_spi_read(drv_data, SSSR) & irq_mask;
592 if (irq_status & SSSR_ROR) {
593 int_error_stop(drv_data, "interrupt_transfer: fifo overrun");
597 if (irq_status & SSSR_TINT) {
598 pxa2xx_spi_write(drv_data, SSSR, SSSR_TINT);
599 if (drv_data->read(drv_data)) {
600 int_transfer_complete(drv_data);
605 /* Drain rx fifo, Fill tx fifo and prevent overruns */
607 if (drv_data->read(drv_data)) {
608 int_transfer_complete(drv_data);
611 } while (drv_data->write(drv_data));
613 if (drv_data->read(drv_data)) {
614 int_transfer_complete(drv_data);
618 if (drv_data->tx == drv_data->tx_end) {
622 sccr1_reg = pxa2xx_spi_read(drv_data, SSCR1);
623 sccr1_reg &= ~SSCR1_TIE;
626 * PXA25x_SSP has no timeout, set up rx threshould for the
627 * remaining RX bytes.
629 if (pxa25x_ssp_comp(drv_data)) {
632 pxa2xx_spi_clear_rx_thre(drv_data, &sccr1_reg);
634 bytes_left = drv_data->rx_end - drv_data->rx;
635 switch (drv_data->n_bytes) {
642 rx_thre = pxa2xx_spi_get_rx_default_thre(drv_data);
643 if (rx_thre > bytes_left)
644 rx_thre = bytes_left;
646 pxa2xx_spi_set_rx_thre(drv_data, &sccr1_reg, rx_thre);
648 pxa2xx_spi_write(drv_data, SSCR1, sccr1_reg);
651 /* We did something */
655 static irqreturn_t ssp_int(int irq, void *dev_id)
657 struct driver_data *drv_data = dev_id;
659 u32 mask = drv_data->mask_sr;
663 * The IRQ might be shared with other peripherals so we must first
664 * check that are we RPM suspended or not. If we are we assume that
665 * the IRQ was not for us (we shouldn't be RPM suspended when the
666 * interrupt is enabled).
668 if (pm_runtime_suspended(&drv_data->pdev->dev))
672 * If the device is not yet in RPM suspended state and we get an
673 * interrupt that is meant for another device, check if status bits
674 * are all set to one. That means that the device is already
677 status = pxa2xx_spi_read(drv_data, SSSR);
681 sccr1_reg = pxa2xx_spi_read(drv_data, SSCR1);
683 /* Ignore possible writes if we don't need to write */
684 if (!(sccr1_reg & SSCR1_TIE))
687 if (!(status & mask))
690 if (!drv_data->cur_msg) {
692 pxa2xx_spi_write(drv_data, SSCR0,
693 pxa2xx_spi_read(drv_data, SSCR0)
695 pxa2xx_spi_write(drv_data, SSCR1,
696 pxa2xx_spi_read(drv_data, SSCR1)
697 & ~drv_data->int_cr1);
698 if (!pxa25x_ssp_comp(drv_data))
699 pxa2xx_spi_write(drv_data, SSTO, 0);
700 write_SSSR_CS(drv_data, drv_data->clear_sr);
702 dev_err(&drv_data->pdev->dev,
703 "bad message state in interrupt handler\n");
709 return drv_data->transfer_handler(drv_data);
713 * The Quark SPI has an additional 24 bit register (DDS_CLK_RATE) to multiply
714 * input frequency by fractions of 2^24. It also has a divider by 5.
716 * There are formulas to get baud rate value for given input frequency and
717 * divider parameters, such as DDS_CLK_RATE and SCR:
721 * Fssp = Fsys * DDS_CLK_RATE / 2^24 (1)
722 * Baud rate = Fsclk = Fssp / (2 * (SCR + 1)) (2)
724 * DDS_CLK_RATE either 2^n or 2^n / 5.
725 * SCR is in range 0 .. 255
727 * Divisor = 5^i * 2^j * 2 * k
728 * i = [0, 1] i = 1 iff j = 0 or j > 3
729 * j = [0, 23] j = 0 iff i = 1
731 * Special case: j = 0, i = 1: Divisor = 2 / 5
733 * Accordingly to the specification the recommended values for DDS_CLK_RATE
735 * Case 1: 2^n, n = [0, 23]
736 * Case 2: 2^24 * 2 / 5 (0x666666)
737 * Case 3: less than or equal to 2^24 / 5 / 16 (0x33333)
739 * In all cases the lowest possible value is better.
741 * The function calculates parameters for all cases and chooses the one closest
742 * to the asked baud rate.
744 static unsigned int quark_x1000_get_clk_div(int rate, u32 *dds)
746 unsigned long xtal = 200000000;
747 unsigned long fref = xtal / 2; /* mandatory division by 2,
750 unsigned long fref1 = fref / 2; /* case 1 */
751 unsigned long fref2 = fref * 2 / 5; /* case 2 */
753 unsigned long q, q1, q2;
759 /* Set initial value for DDS_CLK_RATE */
760 mul = (1 << 24) >> 1;
762 /* Calculate initial quot */
763 q1 = DIV_ROUND_UP(fref1, rate);
765 /* Scale q1 if it's too big */
767 /* Scale q1 to range [1, 512] */
768 scale = fls_long(q1 - 1);
774 /* Round the result if we have a remainder */
778 /* Decrease DDS_CLK_RATE as much as we can without loss in precision */
783 /* Get the remainder */
784 r1 = abs(fref1 / (1 << (24 - fls_long(mul))) / q1 - rate);
788 q2 = DIV_ROUND_UP(fref2, rate);
789 r2 = abs(fref2 / q2 - rate);
792 * Choose the best between two: less remainder we have the better. We
793 * can't go case 2 if q2 is greater than 256 since SCR register can
794 * hold only values 0 .. 255.
796 if (r2 >= r1 || q2 > 256) {
797 /* case 1 is better */
801 /* case 2 is better */
804 mul = (1 << 24) * 2 / 5;
807 /* Check case 3 only if the divisor is big enough */
808 if (fref / rate >= 80) {
812 /* Calculate initial quot */
813 q1 = DIV_ROUND_UP(fref, rate);
816 /* Get the remainder */
817 fssp = (u64)fref * m;
818 do_div(fssp, 1 << 24);
819 r1 = abs(fssp - rate);
821 /* Choose this one if it suits better */
823 /* case 3 is better */
833 static unsigned int ssp_get_clk_div(struct driver_data *drv_data, int rate)
835 unsigned long ssp_clk = drv_data->master->max_speed_hz;
836 const struct ssp_device *ssp = drv_data->ssp;
838 rate = min_t(int, ssp_clk, rate);
840 if (ssp->type == PXA25x_SSP || ssp->type == CE4100_SSP)
841 return (ssp_clk / (2 * rate) - 1) & 0xff;
843 return (ssp_clk / rate - 1) & 0xfff;
846 static unsigned int pxa2xx_ssp_get_clk_div(struct driver_data *drv_data,
849 struct chip_data *chip = drv_data->cur_chip;
850 unsigned int clk_div;
852 switch (drv_data->ssp_type) {
853 case QUARK_X1000_SSP:
854 clk_div = quark_x1000_get_clk_div(rate, &chip->dds_rate);
857 clk_div = ssp_get_clk_div(drv_data, rate);
863 static void pump_transfers(unsigned long data)
865 struct driver_data *drv_data = (struct driver_data *)data;
866 struct spi_message *message = NULL;
867 struct spi_transfer *transfer = NULL;
868 struct spi_transfer *previous = NULL;
869 struct chip_data *chip = NULL;
875 u32 dma_thresh = drv_data->cur_chip->dma_threshold;
876 u32 dma_burst = drv_data->cur_chip->dma_burst_size;
877 u32 change_mask = pxa2xx_spi_get_ssrc1_change_mask(drv_data);
879 /* Get current state information */
880 message = drv_data->cur_msg;
881 transfer = drv_data->cur_transfer;
882 chip = drv_data->cur_chip;
884 /* Handle for abort */
885 if (message->state == ERROR_STATE) {
886 message->status = -EIO;
891 /* Handle end of message */
892 if (message->state == DONE_STATE) {
898 /* Delay if requested at end of transfer before CS change */
899 if (message->state == RUNNING_STATE) {
900 previous = list_entry(transfer->transfer_list.prev,
903 if (previous->delay_usecs)
904 udelay(previous->delay_usecs);
906 /* Drop chip select only if cs_change is requested */
907 if (previous->cs_change)
908 cs_deassert(drv_data);
911 /* Check if we can DMA this transfer */
912 if (!pxa2xx_spi_dma_is_possible(transfer->len) && chip->enable_dma) {
914 /* reject already-mapped transfers; PIO won't always work */
915 if (message->is_dma_mapped
916 || transfer->rx_dma || transfer->tx_dma) {
917 dev_err(&drv_data->pdev->dev,
918 "pump_transfers: mapped transfer length of "
919 "%u is greater than %d\n",
920 transfer->len, MAX_DMA_LEN);
921 message->status = -EINVAL;
926 /* warn ... we force this to PIO mode */
927 dev_warn_ratelimited(&message->spi->dev,
928 "pump_transfers: DMA disabled for transfer length %ld "
930 (long)drv_data->len, MAX_DMA_LEN);
933 /* Setup the transfer state based on the type of transfer */
934 if (pxa2xx_spi_flush(drv_data) == 0) {
935 dev_err(&drv_data->pdev->dev, "pump_transfers: flush failed\n");
936 message->status = -EIO;
940 drv_data->n_bytes = chip->n_bytes;
941 drv_data->tx = (void *)transfer->tx_buf;
942 drv_data->tx_end = drv_data->tx + transfer->len;
943 drv_data->rx = transfer->rx_buf;
944 drv_data->rx_end = drv_data->rx + transfer->len;
945 drv_data->rx_dma = transfer->rx_dma;
946 drv_data->tx_dma = transfer->tx_dma;
947 drv_data->len = transfer->len;
948 drv_data->write = drv_data->tx ? chip->write : null_writer;
949 drv_data->read = drv_data->rx ? chip->read : null_reader;
951 /* Change speed and bit per word on a per transfer */
952 bits = transfer->bits_per_word;
953 speed = transfer->speed_hz;
955 clk_div = pxa2xx_ssp_get_clk_div(drv_data, speed);
958 drv_data->n_bytes = 1;
959 drv_data->read = drv_data->read != null_reader ?
960 u8_reader : null_reader;
961 drv_data->write = drv_data->write != null_writer ?
962 u8_writer : null_writer;
963 } else if (bits <= 16) {
964 drv_data->n_bytes = 2;
965 drv_data->read = drv_data->read != null_reader ?
966 u16_reader : null_reader;
967 drv_data->write = drv_data->write != null_writer ?
968 u16_writer : null_writer;
969 } else if (bits <= 32) {
970 drv_data->n_bytes = 4;
971 drv_data->read = drv_data->read != null_reader ?
972 u32_reader : null_reader;
973 drv_data->write = drv_data->write != null_writer ?
974 u32_writer : null_writer;
977 * if bits/word is changed in dma mode, then must check the
978 * thresholds and burst also
980 if (chip->enable_dma) {
981 if (pxa2xx_spi_set_dma_burst_and_threshold(chip,
985 dev_warn_ratelimited(&message->spi->dev,
986 "pump_transfers: DMA burst size reduced to match bits_per_word\n");
989 /* NOTE: PXA25x_SSP _could_ use external clocking ... */
990 cr0 = pxa2xx_configure_sscr0(drv_data, clk_div, bits);
991 if (!pxa25x_ssp_comp(drv_data))
992 dev_dbg(&message->spi->dev, "%u Hz actual, %s\n",
993 drv_data->master->max_speed_hz
994 / (1 + ((cr0 & SSCR0_SCR(0xfff)) >> 8)),
995 chip->enable_dma ? "DMA" : "PIO");
997 dev_dbg(&message->spi->dev, "%u Hz actual, %s\n",
998 drv_data->master->max_speed_hz / 2
999 / (1 + ((cr0 & SSCR0_SCR(0x0ff)) >> 8)),
1000 chip->enable_dma ? "DMA" : "PIO");
1002 message->state = RUNNING_STATE;
1004 drv_data->dma_mapped = 0;
1005 if (pxa2xx_spi_dma_is_possible(drv_data->len))
1006 drv_data->dma_mapped = pxa2xx_spi_map_dma_buffers(drv_data);
1007 if (drv_data->dma_mapped) {
1009 /* Ensure we have the correct interrupt handler */
1010 drv_data->transfer_handler = pxa2xx_spi_dma_transfer;
1012 pxa2xx_spi_dma_prepare(drv_data, dma_burst);
1014 /* Clear status and start DMA engine */
1015 cr1 = chip->cr1 | dma_thresh | drv_data->dma_cr1;
1016 pxa2xx_spi_write(drv_data, SSSR, drv_data->clear_sr);
1018 pxa2xx_spi_dma_start(drv_data);
1020 /* Ensure we have the correct interrupt handler */
1021 drv_data->transfer_handler = interrupt_transfer;
1024 cr1 = chip->cr1 | chip->threshold | drv_data->int_cr1;
1025 write_SSSR_CS(drv_data, drv_data->clear_sr);
1028 if (is_lpss_ssp(drv_data)) {
1029 if ((pxa2xx_spi_read(drv_data, SSIRF) & 0xff)
1030 != chip->lpss_rx_threshold)
1031 pxa2xx_spi_write(drv_data, SSIRF,
1032 chip->lpss_rx_threshold);
1033 if ((pxa2xx_spi_read(drv_data, SSITF) & 0xffff)
1034 != chip->lpss_tx_threshold)
1035 pxa2xx_spi_write(drv_data, SSITF,
1036 chip->lpss_tx_threshold);
1039 if (is_quark_x1000_ssp(drv_data) &&
1040 (pxa2xx_spi_read(drv_data, DDS_RATE) != chip->dds_rate))
1041 pxa2xx_spi_write(drv_data, DDS_RATE, chip->dds_rate);
1043 /* see if we need to reload the config registers */
1044 if ((pxa2xx_spi_read(drv_data, SSCR0) != cr0)
1045 || (pxa2xx_spi_read(drv_data, SSCR1) & change_mask)
1046 != (cr1 & change_mask)) {
1047 /* stop the SSP, and update the other bits */
1048 pxa2xx_spi_write(drv_data, SSCR0, cr0 & ~SSCR0_SSE);
1049 if (!pxa25x_ssp_comp(drv_data))
1050 pxa2xx_spi_write(drv_data, SSTO, chip->timeout);
1051 /* first set CR1 without interrupt and service enables */
1052 pxa2xx_spi_write(drv_data, SSCR1, cr1 & change_mask);
1053 /* restart the SSP */
1054 pxa2xx_spi_write(drv_data, SSCR0, cr0);
1057 if (!pxa25x_ssp_comp(drv_data))
1058 pxa2xx_spi_write(drv_data, SSTO, chip->timeout);
1061 cs_assert(drv_data);
1063 /* after chip select, release the data by enabling service
1064 * requests and interrupts, without changing any mode bits */
1065 pxa2xx_spi_write(drv_data, SSCR1, cr1);
1068 static int pxa2xx_spi_transfer_one_message(struct spi_master *master,
1069 struct spi_message *msg)
1071 struct driver_data *drv_data = spi_master_get_devdata(master);
1073 drv_data->cur_msg = msg;
1074 /* Initial message state*/
1075 drv_data->cur_msg->state = START_STATE;
1076 drv_data->cur_transfer = list_entry(drv_data->cur_msg->transfers.next,
1077 struct spi_transfer,
1080 /* prepare to setup the SSP, in pump_transfers, using the per
1081 * chip configuration */
1082 drv_data->cur_chip = spi_get_ctldata(drv_data->cur_msg->spi);
1084 /* Mark as busy and launch transfers */
1085 tasklet_schedule(&drv_data->pump_transfers);
1089 static int pxa2xx_spi_unprepare_transfer(struct spi_master *master)
1091 struct driver_data *drv_data = spi_master_get_devdata(master);
1093 /* Disable the SSP now */
1094 pxa2xx_spi_write(drv_data, SSCR0,
1095 pxa2xx_spi_read(drv_data, SSCR0) & ~SSCR0_SSE);
1100 static int setup_cs(struct spi_device *spi, struct chip_data *chip,
1101 struct pxa2xx_spi_chip *chip_info)
1105 if (chip == NULL || chip_info == NULL)
1108 /* NOTE: setup() can be called multiple times, possibly with
1109 * different chip_info, release previously requested GPIO
1111 if (gpio_is_valid(chip->gpio_cs))
1112 gpio_free(chip->gpio_cs);
1114 /* If (*cs_control) is provided, ignore GPIO chip select */
1115 if (chip_info->cs_control) {
1116 chip->cs_control = chip_info->cs_control;
1120 if (gpio_is_valid(chip_info->gpio_cs)) {
1121 err = gpio_request(chip_info->gpio_cs, "SPI_CS");
1123 dev_err(&spi->dev, "failed to request chip select GPIO%d\n",
1124 chip_info->gpio_cs);
1128 chip->gpio_cs = chip_info->gpio_cs;
1129 chip->gpio_cs_inverted = spi->mode & SPI_CS_HIGH;
1131 err = gpio_direction_output(chip->gpio_cs,
1132 !chip->gpio_cs_inverted);
1138 static int setup(struct spi_device *spi)
1140 struct pxa2xx_spi_chip *chip_info = NULL;
1141 struct chip_data *chip;
1142 const struct lpss_config *config;
1143 struct driver_data *drv_data = spi_master_get_devdata(spi->master);
1144 uint tx_thres, tx_hi_thres, rx_thres;
1146 switch (drv_data->ssp_type) {
1147 case QUARK_X1000_SSP:
1148 tx_thres = TX_THRESH_QUARK_X1000_DFLT;
1150 rx_thres = RX_THRESH_QUARK_X1000_DFLT;
1155 config = lpss_get_config(drv_data);
1156 tx_thres = config->tx_threshold_lo;
1157 tx_hi_thres = config->tx_threshold_hi;
1158 rx_thres = config->rx_threshold;
1161 tx_thres = TX_THRESH_DFLT;
1163 rx_thres = RX_THRESH_DFLT;
1167 /* Only alloc on first setup */
1168 chip = spi_get_ctldata(spi);
1170 chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL);
1174 if (drv_data->ssp_type == CE4100_SSP) {
1175 if (spi->chip_select > 4) {
1177 "failed setup: cs number must not be > 4.\n");
1182 chip->frm = spi->chip_select;
1185 chip->enable_dma = 0;
1186 chip->timeout = TIMOUT_DFLT;
1189 /* protocol drivers may change the chip settings, so...
1190 * if chip_info exists, use it */
1191 chip_info = spi->controller_data;
1193 /* chip_info isn't always needed */
1196 if (chip_info->timeout)
1197 chip->timeout = chip_info->timeout;
1198 if (chip_info->tx_threshold)
1199 tx_thres = chip_info->tx_threshold;
1200 if (chip_info->tx_hi_threshold)
1201 tx_hi_thres = chip_info->tx_hi_threshold;
1202 if (chip_info->rx_threshold)
1203 rx_thres = chip_info->rx_threshold;
1204 chip->enable_dma = drv_data->master_info->enable_dma;
1205 chip->dma_threshold = 0;
1206 if (chip_info->enable_loopback)
1207 chip->cr1 = SSCR1_LBM;
1208 } else if (ACPI_HANDLE(&spi->dev)) {
1210 * Slave devices enumerated from ACPI namespace don't
1211 * usually have chip_info but we still might want to use
1214 chip->enable_dma = drv_data->master_info->enable_dma;
1217 chip->lpss_rx_threshold = SSIRF_RxThresh(rx_thres);
1218 chip->lpss_tx_threshold = SSITF_TxLoThresh(tx_thres)
1219 | SSITF_TxHiThresh(tx_hi_thres);
1221 /* set dma burst and threshold outside of chip_info path so that if
1222 * chip_info goes away after setting chip->enable_dma, the
1223 * burst and threshold can still respond to changes in bits_per_word */
1224 if (chip->enable_dma) {
1225 /* set up legal burst and threshold for dma */
1226 if (pxa2xx_spi_set_dma_burst_and_threshold(chip, spi,
1228 &chip->dma_burst_size,
1229 &chip->dma_threshold)) {
1231 "in setup: DMA burst size reduced to match bits_per_word\n");
1235 switch (drv_data->ssp_type) {
1236 case QUARK_X1000_SSP:
1237 chip->threshold = (QUARK_X1000_SSCR1_RxTresh(rx_thres)
1238 & QUARK_X1000_SSCR1_RFT)
1239 | (QUARK_X1000_SSCR1_TxTresh(tx_thres)
1240 & QUARK_X1000_SSCR1_TFT);
1243 chip->threshold = (SSCR1_RxTresh(rx_thres) & SSCR1_RFT) |
1244 (SSCR1_TxTresh(tx_thres) & SSCR1_TFT);
1248 chip->cr1 &= ~(SSCR1_SPO | SSCR1_SPH);
1249 chip->cr1 |= (((spi->mode & SPI_CPHA) != 0) ? SSCR1_SPH : 0)
1250 | (((spi->mode & SPI_CPOL) != 0) ? SSCR1_SPO : 0);
1252 if (spi->mode & SPI_LOOP)
1253 chip->cr1 |= SSCR1_LBM;
1255 if (spi->bits_per_word <= 8) {
1257 chip->read = u8_reader;
1258 chip->write = u8_writer;
1259 } else if (spi->bits_per_word <= 16) {
1261 chip->read = u16_reader;
1262 chip->write = u16_writer;
1263 } else if (spi->bits_per_word <= 32) {
1265 chip->read = u32_reader;
1266 chip->write = u32_writer;
1269 spi_set_ctldata(spi, chip);
1271 if (drv_data->ssp_type == CE4100_SSP)
1274 return setup_cs(spi, chip, chip_info);
1277 static void cleanup(struct spi_device *spi)
1279 struct chip_data *chip = spi_get_ctldata(spi);
1280 struct driver_data *drv_data = spi_master_get_devdata(spi->master);
1285 if (drv_data->ssp_type != CE4100_SSP && gpio_is_valid(chip->gpio_cs))
1286 gpio_free(chip->gpio_cs);
1293 static const struct acpi_device_id pxa2xx_spi_acpi_match[] = {
1294 { "INT33C0", LPSS_LPT_SSP },
1295 { "INT33C1", LPSS_LPT_SSP },
1296 { "INT3430", LPSS_LPT_SSP },
1297 { "INT3431", LPSS_LPT_SSP },
1298 { "80860F0E", LPSS_BYT_SSP },
1299 { "8086228E", LPSS_BYT_SSP },
1302 MODULE_DEVICE_TABLE(acpi, pxa2xx_spi_acpi_match);
1305 * PCI IDs of compound devices that integrate both host controller and private
1306 * integrated DMA engine. Please note these are not used in module
1307 * autoloading and probing in this module but matching the LPSS SSP type.
1309 static const struct pci_device_id pxa2xx_spi_pci_compound_match[] = {
1311 { PCI_VDEVICE(INTEL, 0x9d29), LPSS_SPT_SSP },
1312 { PCI_VDEVICE(INTEL, 0x9d2a), LPSS_SPT_SSP },
1314 { PCI_VDEVICE(INTEL, 0xa129), LPSS_SPT_SSP },
1315 { PCI_VDEVICE(INTEL, 0xa12a), LPSS_SPT_SSP },
1319 static bool pxa2xx_spi_idma_filter(struct dma_chan *chan, void *param)
1321 struct device *dev = param;
1323 if (dev != chan->device->dev->parent)
1329 static struct pxa2xx_spi_master *
1330 pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev)
1332 struct pxa2xx_spi_master *pdata;
1333 struct acpi_device *adev;
1334 struct ssp_device *ssp;
1335 struct resource *res;
1336 const struct acpi_device_id *adev_id = NULL;
1337 const struct pci_device_id *pcidev_id = NULL;
1341 adev = ACPI_COMPANION(&pdev->dev);
1345 if (dev_is_pci(pdev->dev.parent))
1346 pcidev_id = pci_match_id(pxa2xx_spi_pci_compound_match,
1347 to_pci_dev(pdev->dev.parent));
1349 adev_id = acpi_match_device(pdev->dev.driver->acpi_match_table,
1353 type = (int)adev_id->driver_data;
1355 type = (int)pcidev_id->driver_data;
1359 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
1363 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1369 ssp->phys_base = res->start;
1370 ssp->mmio_base = devm_ioremap_resource(&pdev->dev, res);
1371 if (IS_ERR(ssp->mmio_base))
1375 pdata->tx_param = pdev->dev.parent;
1376 pdata->rx_param = pdev->dev.parent;
1377 pdata->dma_filter = pxa2xx_spi_idma_filter;
1380 ssp->clk = devm_clk_get(&pdev->dev, NULL);
1381 ssp->irq = platform_get_irq(pdev, 0);
1386 if (adev->pnp.unique_id && !kstrtouint(adev->pnp.unique_id, 0, &devid))
1387 ssp->port_id = devid;
1389 pdata->num_chipselect = 1;
1390 pdata->enable_dma = true;
1396 static inline struct pxa2xx_spi_master *
1397 pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev)
1403 static int pxa2xx_spi_probe(struct platform_device *pdev)
1405 struct device *dev = &pdev->dev;
1406 struct pxa2xx_spi_master *platform_info;
1407 struct spi_master *master;
1408 struct driver_data *drv_data;
1409 struct ssp_device *ssp;
1410 const struct lpss_config *config;
1414 platform_info = dev_get_platdata(dev);
1415 if (!platform_info) {
1416 platform_info = pxa2xx_spi_acpi_get_pdata(pdev);
1417 if (!platform_info) {
1418 dev_err(&pdev->dev, "missing platform data\n");
1423 ssp = pxa_ssp_request(pdev->id, pdev->name);
1425 ssp = &platform_info->ssp;
1427 if (!ssp->mmio_base) {
1428 dev_err(&pdev->dev, "failed to get ssp\n");
1432 master = spi_alloc_master(dev, sizeof(struct driver_data));
1434 dev_err(&pdev->dev, "cannot alloc spi_master\n");
1438 drv_data = spi_master_get_devdata(master);
1439 drv_data->master = master;
1440 drv_data->master_info = platform_info;
1441 drv_data->pdev = pdev;
1442 drv_data->ssp = ssp;
1444 master->dev.parent = &pdev->dev;
1445 master->dev.of_node = pdev->dev.of_node;
1446 /* the spi->mode bits understood by this driver: */
1447 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP;
1449 master->bus_num = ssp->port_id;
1450 master->dma_alignment = DMA_ALIGNMENT;
1451 master->cleanup = cleanup;
1452 master->setup = setup;
1453 master->transfer_one_message = pxa2xx_spi_transfer_one_message;
1454 master->unprepare_transfer_hardware = pxa2xx_spi_unprepare_transfer;
1455 master->auto_runtime_pm = true;
1457 drv_data->ssp_type = ssp->type;
1459 drv_data->ioaddr = ssp->mmio_base;
1460 drv_data->ssdr_physical = ssp->phys_base + SSDR;
1461 if (pxa25x_ssp_comp(drv_data)) {
1462 switch (drv_data->ssp_type) {
1463 case QUARK_X1000_SSP:
1464 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
1467 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16);
1471 drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE;
1472 drv_data->dma_cr1 = 0;
1473 drv_data->clear_sr = SSSR_ROR;
1474 drv_data->mask_sr = SSSR_RFS | SSSR_TFS | SSSR_ROR;
1476 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
1477 drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE | SSCR1_TINTE;
1478 drv_data->dma_cr1 = DEFAULT_DMA_CR1;
1479 drv_data->clear_sr = SSSR_ROR | SSSR_TINT;
1480 drv_data->mask_sr = SSSR_TINT | SSSR_RFS | SSSR_TFS | SSSR_ROR;
1483 status = request_irq(ssp->irq, ssp_int, IRQF_SHARED, dev_name(dev),
1486 dev_err(&pdev->dev, "cannot get IRQ %d\n", ssp->irq);
1487 goto out_error_master_alloc;
1490 /* Setup DMA if requested */
1491 if (platform_info->enable_dma) {
1492 status = pxa2xx_spi_dma_setup(drv_data);
1494 dev_dbg(dev, "no DMA channels available, using PIO\n");
1495 platform_info->enable_dma = false;
1499 /* Enable SOC clock */
1500 clk_prepare_enable(ssp->clk);
1502 master->max_speed_hz = clk_get_rate(ssp->clk);
1504 /* Load default SSP configuration */
1505 pxa2xx_spi_write(drv_data, SSCR0, 0);
1506 switch (drv_data->ssp_type) {
1507 case QUARK_X1000_SSP:
1508 tmp = QUARK_X1000_SSCR1_RxTresh(RX_THRESH_QUARK_X1000_DFLT)
1509 | QUARK_X1000_SSCR1_TxTresh(TX_THRESH_QUARK_X1000_DFLT);
1510 pxa2xx_spi_write(drv_data, SSCR1, tmp);
1512 /* using the Motorola SPI protocol and use 8 bit frame */
1513 pxa2xx_spi_write(drv_data, SSCR0,
1514 QUARK_X1000_SSCR0_Motorola
1515 | QUARK_X1000_SSCR0_DataSize(8));
1518 tmp = SSCR1_RxTresh(RX_THRESH_DFLT) |
1519 SSCR1_TxTresh(TX_THRESH_DFLT);
1520 pxa2xx_spi_write(drv_data, SSCR1, tmp);
1521 tmp = SSCR0_SCR(2) | SSCR0_Motorola | SSCR0_DataSize(8);
1522 pxa2xx_spi_write(drv_data, SSCR0, tmp);
1526 if (!pxa25x_ssp_comp(drv_data))
1527 pxa2xx_spi_write(drv_data, SSTO, 0);
1529 if (!is_quark_x1000_ssp(drv_data))
1530 pxa2xx_spi_write(drv_data, SSPSP, 0);
1532 if (is_lpss_ssp(drv_data))
1533 lpss_ssp_setup(drv_data);
1535 if (is_lpss_ssp(drv_data)) {
1536 lpss_ssp_setup(drv_data);
1537 config = lpss_get_config(drv_data);
1538 if (config->reg_capabilities >= 0) {
1539 tmp = __lpss_ssp_read_priv(drv_data,
1540 config->reg_capabilities);
1541 tmp &= LPSS_CAPS_CS_EN_MASK;
1542 tmp >>= LPSS_CAPS_CS_EN_SHIFT;
1543 platform_info->num_chipselect = ffz(tmp);
1546 master->num_chipselect = platform_info->num_chipselect;
1548 tasklet_init(&drv_data->pump_transfers, pump_transfers,
1549 (unsigned long)drv_data);
1551 pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
1552 pm_runtime_use_autosuspend(&pdev->dev);
1553 pm_runtime_set_active(&pdev->dev);
1554 pm_runtime_enable(&pdev->dev);
1556 /* Register with the SPI framework */
1557 platform_set_drvdata(pdev, drv_data);
1558 status = devm_spi_register_master(&pdev->dev, master);
1560 dev_err(&pdev->dev, "problem registering spi master\n");
1561 goto out_error_clock_enabled;
1566 out_error_clock_enabled:
1567 clk_disable_unprepare(ssp->clk);
1568 pxa2xx_spi_dma_release(drv_data);
1569 free_irq(ssp->irq, drv_data);
1571 out_error_master_alloc:
1572 spi_master_put(master);
1577 static int pxa2xx_spi_remove(struct platform_device *pdev)
1579 struct driver_data *drv_data = platform_get_drvdata(pdev);
1580 struct ssp_device *ssp;
1584 ssp = drv_data->ssp;
1586 pm_runtime_get_sync(&pdev->dev);
1588 /* Disable the SSP at the peripheral and SOC level */
1589 pxa2xx_spi_write(drv_data, SSCR0, 0);
1590 clk_disable_unprepare(ssp->clk);
1593 if (drv_data->master_info->enable_dma)
1594 pxa2xx_spi_dma_release(drv_data);
1596 pm_runtime_put_noidle(&pdev->dev);
1597 pm_runtime_disable(&pdev->dev);
1600 free_irq(ssp->irq, drv_data);
1608 static void pxa2xx_spi_shutdown(struct platform_device *pdev)
1612 if ((status = pxa2xx_spi_remove(pdev)) != 0)
1613 dev_err(&pdev->dev, "shutdown failed with %d\n", status);
1616 #ifdef CONFIG_PM_SLEEP
1617 static int pxa2xx_spi_suspend(struct device *dev)
1619 struct driver_data *drv_data = dev_get_drvdata(dev);
1620 struct ssp_device *ssp = drv_data->ssp;
1623 status = spi_master_suspend(drv_data->master);
1626 pxa2xx_spi_write(drv_data, SSCR0, 0);
1628 if (!pm_runtime_suspended(dev))
1629 clk_disable_unprepare(ssp->clk);
1634 static int pxa2xx_spi_resume(struct device *dev)
1636 struct driver_data *drv_data = dev_get_drvdata(dev);
1637 struct ssp_device *ssp = drv_data->ssp;
1640 /* Enable the SSP clock */
1641 if (!pm_runtime_suspended(dev))
1642 clk_prepare_enable(ssp->clk);
1644 /* Restore LPSS private register bits */
1645 if (is_lpss_ssp(drv_data))
1646 lpss_ssp_setup(drv_data);
1648 /* Start the queue running */
1649 status = spi_master_resume(drv_data->master);
1651 dev_err(dev, "problem starting queue (%d)\n", status);
1660 static int pxa2xx_spi_runtime_suspend(struct device *dev)
1662 struct driver_data *drv_data = dev_get_drvdata(dev);
1664 clk_disable_unprepare(drv_data->ssp->clk);
1668 static int pxa2xx_spi_runtime_resume(struct device *dev)
1670 struct driver_data *drv_data = dev_get_drvdata(dev);
1672 clk_prepare_enable(drv_data->ssp->clk);
1677 static const struct dev_pm_ops pxa2xx_spi_pm_ops = {
1678 SET_SYSTEM_SLEEP_PM_OPS(pxa2xx_spi_suspend, pxa2xx_spi_resume)
1679 SET_RUNTIME_PM_OPS(pxa2xx_spi_runtime_suspend,
1680 pxa2xx_spi_runtime_resume, NULL)
1683 static struct platform_driver driver = {
1685 .name = "pxa2xx-spi",
1686 .pm = &pxa2xx_spi_pm_ops,
1687 .acpi_match_table = ACPI_PTR(pxa2xx_spi_acpi_match),
1689 .probe = pxa2xx_spi_probe,
1690 .remove = pxa2xx_spi_remove,
1691 .shutdown = pxa2xx_spi_shutdown,
1694 static int __init pxa2xx_spi_init(void)
1696 return platform_driver_register(&driver);
1698 subsys_initcall(pxa2xx_spi_init);
1700 static void __exit pxa2xx_spi_exit(void)
1702 platform_driver_unregister(&driver);
1704 module_exit(pxa2xx_spi_exit);