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
13 #include <linux/atomic.h>
14 #include <linux/dmaengine.h>
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>
20 #include <linux/scatterlist.h>
21 #include <linux/sizes.h>
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_controller *master;
35
36 /* PXA hookup */
37 struct pxa2xx_spi_master *master_info;
38
39 /* SSP register addresses */
40 void __iomem *ioaddr;
41 phys_addr_t ssdr_physical;
42
43 /* SSP masks*/
44 u32 dma_cr1;
45 u32 int_cr1;
46 u32 clear_sr;
47 u32 mask_sr;
48
49 /* DMA engine support */
50 atomic_t dma_running;
51
52 /* Current transfer state info */
53 void *tx;
54 void *tx_end;
55 void *rx;
56 void *rx_end;
57 u8 n_bytes;
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);
62
63 void __iomem *lpss_base;
64
65 /* GPIOs for chip selects */
66 struct gpio_desc **cs_gpiods;
67 };
68
69 struct chip_data {
70 u32 cr1;
71 u32 dds_rate;
72 u32 timeout;
73 u8 n_bytes;
74 u32 dma_burst_size;
75 u32 threshold;
76 u32 dma_threshold;
77 u16 lpss_rx_threshold;
78 u16 lpss_tx_threshold;
79 u8 enable_dma;
80 union {
81 struct gpio_desc *gpiod_cs;
82 unsigned int frm;
83 };
84 int gpio_cs_inverted;
85 int (*write)(struct driver_data *drv_data);
86 int (*read)(struct driver_data *drv_data);
87 void (*cs_control)(u32 command);
88 };
89
pxa2xx_spi_read(const struct driver_data * drv_data,unsigned reg)90 static inline u32 pxa2xx_spi_read(const struct driver_data *drv_data,
91 unsigned reg)
92 {
93 return __raw_readl(drv_data->ioaddr + reg);
94 }
95
pxa2xx_spi_write(const struct driver_data * drv_data,unsigned reg,u32 val)96 static inline void pxa2xx_spi_write(const struct driver_data *drv_data,
97 unsigned reg, u32 val)
98 {
99 __raw_writel(val, drv_data->ioaddr + reg);
100 }
101
102 #define DMA_ALIGNMENT 8
103
pxa25x_ssp_comp(struct driver_data * drv_data)104 static inline int pxa25x_ssp_comp(struct driver_data *drv_data)
105 {
106 switch (drv_data->ssp_type) {
107 case PXA25x_SSP:
108 case CE4100_SSP:
109 case QUARK_X1000_SSP:
110 return 1;
111 default:
112 return 0;
113 }
114 }
115
write_SSSR_CS(struct driver_data * drv_data,u32 val)116 static inline void write_SSSR_CS(struct driver_data *drv_data, u32 val)
117 {
118 if (drv_data->ssp_type == CE4100_SSP ||
119 drv_data->ssp_type == QUARK_X1000_SSP)
120 val |= pxa2xx_spi_read(drv_data, SSSR) & SSSR_ALT_FRM_MASK;
121
122 pxa2xx_spi_write(drv_data, SSSR, val);
123 }
124
125 extern int pxa2xx_spi_flush(struct driver_data *drv_data);
126
127 #define MAX_DMA_LEN SZ_64K
128 #define DEFAULT_DMA_CR1 (SSCR1_TSRE | SSCR1_RSRE | SSCR1_TRAIL)
129
130 extern irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data);
131 extern int pxa2xx_spi_dma_prepare(struct driver_data *drv_data,
132 struct spi_transfer *xfer);
133 extern void pxa2xx_spi_dma_start(struct driver_data *drv_data);
134 extern void pxa2xx_spi_dma_stop(struct driver_data *drv_data);
135 extern int pxa2xx_spi_dma_setup(struct driver_data *drv_data);
136 extern void pxa2xx_spi_dma_release(struct driver_data *drv_data);
137 extern int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip,
138 struct spi_device *spi,
139 u8 bits_per_word,
140 u32 *burst_code,
141 u32 *threshold);
142
143 #endif /* SPI_PXA2XX_H */
144
