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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; | |
51eea52d | 34 | struct spi_controller *controller; |
cd7bed00 MW |
35 | |
36 | /* PXA hookup */ | |
51eea52d | 37 | struct pxa2xx_spi_controller *controller_info; |
cd7bed00 | 38 | |
cd7bed00 MW |
39 | /* SSP register addresses */ |
40 | void __iomem *ioaddr; | |
7956fadd | 41 | phys_addr_t ssdr_physical; |
cd7bed00 MW |
42 | |
43 | /* SSP masks*/ | |
44 | u32 dma_cr1; | |
45 | u32 int_cr1; | |
46 | u32 clear_sr; | |
47 | u32 mask_sr; | |
48 | ||
5928808e | 49 | /* DMA engine support */ |
5928808e MW |
50 | atomic_t dma_running; |
51 | ||
d5898e19 | 52 | /* Current transfer state info */ |
cd7bed00 MW |
53 | void *tx; |
54 | void *tx_end; | |
55 | void *rx; | |
56 | void *rx_end; | |
cd7bed00 MW |
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); | |
a0d2642e MW |
62 | |
63 | void __iomem *lpss_base; | |
99f499cd MW |
64 | |
65 | /* GPIOs for chip selects */ | |
66 | struct gpio_desc **cs_gpiods; | |
77d33897 LR |
67 | |
68 | /* Optional slave FIFO ready signal */ | |
69 | struct gpio_desc *gpiod_ready; | |
cd7bed00 MW |
70 | }; |
71 | ||
72 | struct chip_data { | |
cd7bed00 | 73 | u32 cr1; |
e5262d05 | 74 | u32 dds_rate; |
cd7bed00 MW |
75 | u32 timeout; |
76 | u8 n_bytes; | |
77 | u32 dma_burst_size; | |
78 | u32 threshold; | |
79 | u32 dma_threshold; | |
a0d2642e MW |
80 | u16 lpss_rx_threshold; |
81 | u16 lpss_tx_threshold; | |
cd7bed00 | 82 | u8 enable_dma; |
cd7bed00 | 83 | union { |
c18d925f | 84 | struct gpio_desc *gpiod_cs; |
cd7bed00 MW |
85 | unsigned int frm; |
86 | }; | |
87 | int gpio_cs_inverted; | |
88 | int (*write)(struct driver_data *drv_data); | |
89 | int (*read)(struct driver_data *drv_data); | |
90 | void (*cs_control)(u32 command); | |
91 | }; | |
92 | ||
c039dd27 JN |
93 | static inline u32 pxa2xx_spi_read(const struct driver_data *drv_data, |
94 | unsigned reg) | |
95 | { | |
96 | return __raw_readl(drv_data->ioaddr + reg); | |
97 | } | |
98 | ||
99 | static inline void pxa2xx_spi_write(const struct driver_data *drv_data, | |
100 | unsigned reg, u32 val) | |
101 | { | |
102 | __raw_writel(val, drv_data->ioaddr + reg); | |
103 | } | |
cd7bed00 | 104 | |
cd7bed00 MW |
105 | #define DMA_ALIGNMENT 8 |
106 | ||
107 | static inline int pxa25x_ssp_comp(struct driver_data *drv_data) | |
108 | { | |
e5262d05 WC |
109 | switch (drv_data->ssp_type) { |
110 | case PXA25x_SSP: | |
111 | case CE4100_SSP: | |
112 | case QUARK_X1000_SSP: | |
cd7bed00 | 113 | return 1; |
e5262d05 WC |
114 | default: |
115 | return 0; | |
116 | } | |
cd7bed00 MW |
117 | } |
118 | ||
119 | static inline void write_SSSR_CS(struct driver_data *drv_data, u32 val) | |
120 | { | |
e5262d05 WC |
121 | if (drv_data->ssp_type == CE4100_SSP || |
122 | drv_data->ssp_type == QUARK_X1000_SSP) | |
c039dd27 | 123 | val |= pxa2xx_spi_read(drv_data, SSSR) & SSSR_ALT_FRM_MASK; |
cd7bed00 | 124 | |
c039dd27 | 125 | pxa2xx_spi_write(drv_data, SSSR, val); |
cd7bed00 MW |
126 | } |
127 | ||
128 | extern int pxa2xx_spi_flush(struct driver_data *drv_data); | |
cd7bed00 | 129 | |
5928808e MW |
130 | #define MAX_DMA_LEN SZ_64K |
131 | #define DEFAULT_DMA_CR1 (SSCR1_TSRE | SSCR1_RSRE | SSCR1_TRAIL) | |
5928808e | 132 | |
cd7bed00 | 133 | extern irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data); |
d5898e19 JN |
134 | extern int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, |
135 | struct spi_transfer *xfer); | |
cd7bed00 | 136 | extern void pxa2xx_spi_dma_start(struct driver_data *drv_data); |
d5898e19 | 137 | extern void pxa2xx_spi_dma_stop(struct driver_data *drv_data); |
cd7bed00 MW |
138 | extern int pxa2xx_spi_dma_setup(struct driver_data *drv_data); |
139 | extern void pxa2xx_spi_dma_release(struct driver_data *drv_data); | |
cd7bed00 MW |
140 | extern int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip, |
141 | struct spi_device *spi, | |
142 | u8 bits_per_word, | |
143 | u32 *burst_code, | |
144 | u32 *threshold); | |
cd7bed00 MW |
145 | |
146 | #endif /* SPI_PXA2XX_H */ |