tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
25struct 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 *controller;
35
36 /* PXA hookup */
37 struct pxa2xx_spi_controller *controller_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 /* Optional slave FIFO ready signal */
69 struct gpio_desc *gpiod_ready;
70};
71
72struct chip_data {
73 u32 cr1;
74 u32 dds_rate;
75 u32 timeout;
76 u8 n_bytes;
77 u32 dma_burst_size;
78 u32 threshold;
79 u32 dma_threshold;
80 u16 lpss_rx_threshold;
81 u16 lpss_tx_threshold;
82 u8 enable_dma;
83 union {
84 struct gpio_desc *gpiod_cs;
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
93static 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
99static 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}
104
105#define DMA_ALIGNMENT 8
106
107static inline int pxa25x_ssp_comp(struct driver_data *drv_data)
108{
109 switch (drv_data->ssp_type) {
110 case PXA25x_SSP:
111 case CE4100_SSP:
112 case QUARK_X1000_SSP:
113 return 1;
114 default:
115 return 0;
116 }
117}
118
119static inline void write_SSSR_CS(struct driver_data *drv_data, u32 val)
120{
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;
124
125 pxa2xx_spi_write(drv_data, SSSR, val);
126}
127
128extern int pxa2xx_spi_flush(struct driver_data *drv_data);
129
130#define MAX_DMA_LEN SZ_64K
131#define DEFAULT_DMA_CR1 (SSCR1_TSRE | SSCR1_RSRE | SSCR1_TRAIL)
132
133extern irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data);
134extern int pxa2xx_spi_dma_prepare(struct driver_data *drv_data,
135 struct spi_transfer *xfer);
136extern void pxa2xx_spi_dma_start(struct driver_data *drv_data);
137extern void pxa2xx_spi_dma_stop(struct driver_data *drv_data);
138extern int pxa2xx_spi_dma_setup(struct driver_data *drv_data);
139extern void pxa2xx_spi_dma_release(struct driver_data *drv_data);
140extern 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);
145
146#endif /* SPI_PXA2XX_H */