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 version 2 as
7 * published by the Free Software Foundation.
13 #include <linux/atomic.h>
14 #include <linux/dmaengine.h>
15 #include <linux/errno.h>
17 #include <linux/interrupt.h>
18 #include <linux/platform_device.h>
19 #include <linux/pxa2xx_ssp.h>
20 #include <linux/scatterlist.h>
21 #include <linux/sizes.h>
22 #include <linux/spi/spi.h>
23 #include <linux/spi/pxa2xx_spi.h>
26 /* Driver model hookup */
27 struct platform_device *pdev;
30 struct ssp_device *ssp;
32 /* SPI framework hookup */
33 enum pxa_ssp_type ssp_type;
34 struct spi_controller *master;
37 struct pxa2xx_spi_master *master_info;
39 /* SSP register addresses */
41 phys_addr_t ssdr_physical;
49 /* DMA engine support */
52 /* Current transfer state info */
58 int (*write)(struct driver_data *drv_data);
59 int (*read)(struct driver_data *drv_data);
60 irqreturn_t (*transfer_handler)(struct driver_data *drv_data);
61 void (*cs_control)(u32 command);
63 void __iomem *lpss_base;
65 /* GPIOs for chip selects */
66 struct gpio_desc **cs_gpiods;
68 /* Optional slave FIFO ready signal */
69 struct gpio_desc *gpiod_ready;
80 u16 lpss_rx_threshold;
81 u16 lpss_tx_threshold;
84 struct gpio_desc *gpiod_cs;
88 int (*write)(struct driver_data *drv_data);
89 int (*read)(struct driver_data *drv_data);
90 void (*cs_control)(u32 command);
93 static inline u32 pxa2xx_spi_read(const struct driver_data *drv_data,
96 return __raw_readl(drv_data->ioaddr + reg);
99 static inline void pxa2xx_spi_write(const struct driver_data *drv_data,
100 unsigned reg, u32 val)
102 __raw_writel(val, drv_data->ioaddr + reg);
105 #define DMA_ALIGNMENT 8
107 static inline int pxa25x_ssp_comp(struct driver_data *drv_data)
109 switch (drv_data->ssp_type) {
112 case QUARK_X1000_SSP:
119 static inline void write_SSSR_CS(struct driver_data *drv_data, u32 val)
121 if (drv_data->ssp_type == CE4100_SSP ||
122 drv_data->ssp_type == QUARK_X1000_SSP)
123 val |= pxa2xx_spi_read(drv_data, SSSR) & SSSR_ALT_FRM_MASK;
125 pxa2xx_spi_write(drv_data, SSSR, val);
128 extern int pxa2xx_spi_flush(struct driver_data *drv_data);
130 #define MAX_DMA_LEN SZ_64K
131 #define DEFAULT_DMA_CR1 (SSCR1_TSRE | SSCR1_RSRE | SSCR1_TRAIL)
133 extern irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data);
134 extern int pxa2xx_spi_dma_prepare(struct driver_data *drv_data,
135 struct spi_transfer *xfer);
136 extern void pxa2xx_spi_dma_start(struct driver_data *drv_data);
137 extern void pxa2xx_spi_dma_stop(struct driver_data *drv_data);
138 extern int pxa2xx_spi_dma_setup(struct driver_data *drv_data);
139 extern void pxa2xx_spi_dma_release(struct driver_data *drv_data);
140 extern int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip,
141 struct spi_device *spi,
146 #endif /* SPI_PXA2XX_H */