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cd7bed00 MW |
1 | /* |
2 | * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs | |
3 | * Copyright (C) 2013, Intel Corporation | |
4 | * | |
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. | |
8 | */ | |
9 | ||
10 | #ifndef SPI_PXA2XX_H | |
11 | #define SPI_PXA2XX_H | |
12 | ||
5928808e MW |
13 | #include <linux/atomic.h> |
14 | #include <linux/dmaengine.h> | |
cd7bed00 MW |
15 | #include <linux/errno.h> |
16 | #include <linux/io.h> | |
17 | #include <linux/interrupt.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/pxa2xx_ssp.h> | |
5928808e MW |
20 | #include <linux/scatterlist.h> |
21 | #include <linux/sizes.h> | |
cd7bed00 MW |
22 | #include <linux/spi/spi.h> |
23 | #include <linux/spi/pxa2xx_spi.h> | |
24 | ||
25 | struct driver_data { | |
26 | /* Driver model hookup */ | |
27 | struct platform_device *pdev; | |
28 | ||
29 | /* SSP Info */ | |
30 | struct ssp_device *ssp; | |
31 | ||
32 | /* SPI framework hookup */ | |
33 | enum pxa_ssp_type ssp_type; | |
34 | struct spi_master *master; | |
35 | ||
36 | /* PXA hookup */ | |
37 | struct pxa2xx_spi_master *master_info; | |
38 | ||
39 | /* PXA private DMA setup stuff */ | |
40 | int rx_channel; | |
41 | int tx_channel; | |
42 | u32 *null_dma_buf; | |
43 | ||
44 | /* SSP register addresses */ | |
45 | void __iomem *ioaddr; | |
46 | u32 ssdr_physical; | |
47 | ||
48 | /* SSP masks*/ | |
49 | u32 dma_cr1; | |
50 | u32 int_cr1; | |
51 | u32 clear_sr; | |
52 | u32 mask_sr; | |
53 | ||
54 | /* Maximun clock rate */ | |
55 | unsigned long max_clk_rate; | |
56 | ||
57 | /* Message Transfer pump */ | |
58 | struct tasklet_struct pump_transfers; | |
59 | ||
5928808e MW |
60 | /* DMA engine support */ |
61 | struct dma_chan *rx_chan; | |
62 | struct dma_chan *tx_chan; | |
63 | struct sg_table rx_sgt; | |
64 | struct sg_table tx_sgt; | |
65 | int rx_nents; | |
66 | int tx_nents; | |
67 | void *dummy; | |
68 | atomic_t dma_running; | |
69 | ||
cd7bed00 MW |
70 | /* Current message transfer state info */ |
71 | struct spi_message *cur_msg; | |
72 | struct spi_transfer *cur_transfer; | |
73 | struct chip_data *cur_chip; | |
74 | size_t len; | |
75 | void *tx; | |
76 | void *tx_end; | |
77 | void *rx; | |
78 | void *rx_end; | |
79 | int dma_mapped; | |
80 | dma_addr_t rx_dma; | |
81 | dma_addr_t tx_dma; | |
82 | size_t rx_map_len; | |
83 | size_t tx_map_len; | |
84 | u8 n_bytes; | |
85 | int (*write)(struct driver_data *drv_data); | |
86 | int (*read)(struct driver_data *drv_data); | |
87 | irqreturn_t (*transfer_handler)(struct driver_data *drv_data); | |
88 | void (*cs_control)(u32 command); | |
89 | }; | |
90 | ||
91 | struct chip_data { | |
92 | u32 cr0; | |
93 | u32 cr1; | |
94 | u32 psp; | |
95 | u32 timeout; | |
96 | u8 n_bytes; | |
97 | u32 dma_burst_size; | |
98 | u32 threshold; | |
99 | u32 dma_threshold; | |
100 | u8 enable_dma; | |
101 | u8 bits_per_word; | |
102 | u32 speed_hz; | |
103 | union { | |
104 | int gpio_cs; | |
105 | unsigned int frm; | |
106 | }; | |
107 | int gpio_cs_inverted; | |
108 | int (*write)(struct driver_data *drv_data); | |
109 | int (*read)(struct driver_data *drv_data); | |
110 | void (*cs_control)(u32 command); | |
111 | }; | |
112 | ||
113 | #define DEFINE_SSP_REG(reg, off) \ | |
114 | static inline u32 read_##reg(void const __iomem *p) \ | |
115 | { return __raw_readl(p + (off)); } \ | |
116 | \ | |
117 | static inline void write_##reg(u32 v, void __iomem *p) \ | |
118 | { __raw_writel(v, p + (off)); } | |
119 | ||
120 | DEFINE_SSP_REG(SSCR0, 0x00) | |
121 | DEFINE_SSP_REG(SSCR1, 0x04) | |
122 | DEFINE_SSP_REG(SSSR, 0x08) | |
123 | DEFINE_SSP_REG(SSITR, 0x0c) | |
124 | DEFINE_SSP_REG(SSDR, 0x10) | |
125 | DEFINE_SSP_REG(SSTO, 0x28) | |
126 | DEFINE_SSP_REG(SSPSP, 0x2c) | |
127 | ||
128 | #define START_STATE ((void *)0) | |
129 | #define RUNNING_STATE ((void *)1) | |
130 | #define DONE_STATE ((void *)2) | |
131 | #define ERROR_STATE ((void *)-1) | |
132 | ||
cd7bed00 MW |
133 | #define IS_DMA_ALIGNED(x) IS_ALIGNED((unsigned long)(x), DMA_ALIGNMENT) |
134 | #define DMA_ALIGNMENT 8 | |
135 | ||
136 | static inline int pxa25x_ssp_comp(struct driver_data *drv_data) | |
137 | { | |
138 | if (drv_data->ssp_type == PXA25x_SSP) | |
139 | return 1; | |
140 | if (drv_data->ssp_type == CE4100_SSP) | |
141 | return 1; | |
142 | return 0; | |
143 | } | |
144 | ||
145 | static inline void write_SSSR_CS(struct driver_data *drv_data, u32 val) | |
146 | { | |
147 | void __iomem *reg = drv_data->ioaddr; | |
148 | ||
149 | if (drv_data->ssp_type == CE4100_SSP) | |
150 | val |= read_SSSR(reg) & SSSR_ALT_FRM_MASK; | |
151 | ||
152 | write_SSSR(val, reg); | |
153 | } | |
154 | ||
155 | extern int pxa2xx_spi_flush(struct driver_data *drv_data); | |
156 | extern void *pxa2xx_spi_next_transfer(struct driver_data *drv_data); | |
157 | ||
5928808e MW |
158 | /* |
159 | * Select the right DMA implementation. | |
160 | */ | |
cd7bed00 | 161 | #if defined(CONFIG_SPI_PXA2XX_PXADMA) |
5928808e MW |
162 | #define SPI_PXA2XX_USE_DMA 1 |
163 | #define MAX_DMA_LEN 8191 | |
164 | #define DEFAULT_DMA_CR1 (SSCR1_TSRE | SSCR1_RSRE | SSCR1_TINTE) | |
165 | #elif defined(CONFIG_SPI_PXA2XX_DMA) | |
166 | #define SPI_PXA2XX_USE_DMA 1 | |
167 | #define MAX_DMA_LEN SZ_64K | |
168 | #define DEFAULT_DMA_CR1 (SSCR1_TSRE | SSCR1_RSRE | SSCR1_TRAIL) | |
169 | #else | |
170 | #undef SPI_PXA2XX_USE_DMA | |
171 | #define MAX_DMA_LEN 0 | |
172 | #define DEFAULT_DMA_CR1 0 | |
173 | #endif | |
174 | ||
175 | #ifdef SPI_PXA2XX_USE_DMA | |
cd7bed00 MW |
176 | extern bool pxa2xx_spi_dma_is_possible(size_t len); |
177 | extern int pxa2xx_spi_map_dma_buffers(struct driver_data *drv_data); | |
178 | extern irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data); | |
179 | extern int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, u32 dma_burst); | |
180 | extern void pxa2xx_spi_dma_start(struct driver_data *drv_data); | |
181 | extern int pxa2xx_spi_dma_setup(struct driver_data *drv_data); | |
182 | extern void pxa2xx_spi_dma_release(struct driver_data *drv_data); | |
183 | extern void pxa2xx_spi_dma_resume(struct driver_data *drv_data); | |
184 | extern int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip, | |
185 | struct spi_device *spi, | |
186 | u8 bits_per_word, | |
187 | u32 *burst_code, | |
188 | u32 *threshold); | |
189 | #else | |
190 | static inline bool pxa2xx_spi_dma_is_possible(size_t len) { return false; } | |
191 | static inline int pxa2xx_spi_map_dma_buffers(struct driver_data *drv_data) | |
192 | { | |
193 | return 0; | |
194 | } | |
195 | #define pxa2xx_spi_dma_transfer NULL | |
196 | static inline void pxa2xx_spi_dma_prepare(struct driver_data *drv_data, | |
197 | u32 dma_burst) {} | |
198 | static inline void pxa2xx_spi_dma_start(struct driver_data *drv_data) {} | |
199 | static inline int pxa2xx_spi_dma_setup(struct driver_data *drv_data) | |
200 | { | |
201 | return 0; | |
202 | } | |
203 | static inline void pxa2xx_spi_dma_release(struct driver_data *drv_data) {} | |
204 | static inline void pxa2xx_spi_dma_resume(struct driver_data *drv_data) {} | |
205 | static inline int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip, | |
206 | struct spi_device *spi, | |
207 | u8 bits_per_word, | |
208 | u32 *burst_code, | |
209 | u32 *threshold) | |
210 | { | |
211 | return -ENODEV; | |
212 | } | |
213 | #endif | |
214 | ||
215 | #endif /* SPI_PXA2XX_H */ |