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_master *master;
37 struct pxa2xx_spi_master *master_info;
39 /* SSP register addresses */
49 /* Maximun clock rate */
50 unsigned long max_clk_rate;
52 /* Message Transfer pump */
53 struct tasklet_struct pump_transfers;
55 /* DMA engine support */
56 struct dma_chan *rx_chan;
57 struct dma_chan *tx_chan;
58 struct sg_table rx_sgt;
59 struct sg_table tx_sgt;
65 /* Current message transfer state info */
66 struct spi_message *cur_msg;
67 struct spi_transfer *cur_transfer;
68 struct chip_data *cur_chip;
80 int (*write)(struct driver_data *drv_data);
81 int (*read)(struct driver_data *drv_data);
82 irqreturn_t (*transfer_handler)(struct driver_data *drv_data);
83 void (*cs_control)(u32 command);
85 void __iomem *lpss_base;
97 u16 lpss_rx_threshold;
98 u16 lpss_tx_threshold;
106 int gpio_cs_inverted;
107 int (*write)(struct driver_data *drv_data);
108 int (*read)(struct driver_data *drv_data);
109 void (*cs_control)(u32 command);
112 static inline u32 pxa2xx_spi_read(const struct driver_data *drv_data,
115 return __raw_readl(drv_data->ioaddr + reg);
118 static inline void pxa2xx_spi_write(const struct driver_data *drv_data,
119 unsigned reg, u32 val)
121 __raw_writel(val, drv_data->ioaddr + reg);
124 #define START_STATE ((void *)0)
125 #define RUNNING_STATE ((void *)1)
126 #define DONE_STATE ((void *)2)
127 #define ERROR_STATE ((void *)-1)
129 #define IS_DMA_ALIGNED(x) IS_ALIGNED((unsigned long)(x), DMA_ALIGNMENT)
130 #define DMA_ALIGNMENT 8
132 static inline int pxa25x_ssp_comp(struct driver_data *drv_data)
134 switch (drv_data->ssp_type) {
137 case QUARK_X1000_SSP:
144 static inline void write_SSSR_CS(struct driver_data *drv_data, u32 val)
146 if (drv_data->ssp_type == CE4100_SSP ||
147 drv_data->ssp_type == QUARK_X1000_SSP)
148 val |= pxa2xx_spi_read(drv_data, SSSR) & SSSR_ALT_FRM_MASK;
150 pxa2xx_spi_write(drv_data, SSSR, val);
153 extern int pxa2xx_spi_flush(struct driver_data *drv_data);
154 extern void *pxa2xx_spi_next_transfer(struct driver_data *drv_data);
157 * Select the right DMA implementation.
159 #if defined(CONFIG_SPI_PXA2XX_DMA)
160 #define SPI_PXA2XX_USE_DMA 1
161 #define MAX_DMA_LEN SZ_64K
162 #define DEFAULT_DMA_CR1 (SSCR1_TSRE | SSCR1_RSRE | SSCR1_TRAIL)
164 #undef SPI_PXA2XX_USE_DMA
165 #define MAX_DMA_LEN 0
166 #define DEFAULT_DMA_CR1 0
169 #ifdef SPI_PXA2XX_USE_DMA
170 extern bool pxa2xx_spi_dma_is_possible(size_t len);
171 extern int pxa2xx_spi_map_dma_buffers(struct driver_data *drv_data);
172 extern irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data);
173 extern int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, u32 dma_burst);
174 extern void pxa2xx_spi_dma_start(struct driver_data *drv_data);
175 extern int pxa2xx_spi_dma_setup(struct driver_data *drv_data);
176 extern void pxa2xx_spi_dma_release(struct driver_data *drv_data);
177 extern void pxa2xx_spi_dma_resume(struct driver_data *drv_data);
178 extern int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip,
179 struct spi_device *spi,
184 static inline bool pxa2xx_spi_dma_is_possible(size_t len) { return false; }
185 static inline int pxa2xx_spi_map_dma_buffers(struct driver_data *drv_data)
189 #define pxa2xx_spi_dma_transfer NULL
190 static inline void pxa2xx_spi_dma_prepare(struct driver_data *drv_data,
192 static inline void pxa2xx_spi_dma_start(struct driver_data *drv_data) {}
193 static inline int pxa2xx_spi_dma_setup(struct driver_data *drv_data)
197 static inline void pxa2xx_spi_dma_release(struct driver_data *drv_data) {}
198 static inline void pxa2xx_spi_dma_resume(struct driver_data *drv_data) {}
199 static inline int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip,
200 struct spi_device *spi,
209 #endif /* SPI_PXA2XX_H */