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1fc7547d BD |
1 | /* linux/drivers/spi/spi_s3c24xx_gpio.c |
2 | * | |
3 | * Copyright (c) 2006 Ben Dooks | |
4 | * Copyright (c) 2006 Simtec Electronics | |
5 | * | |
6 | * S3C24XX GPIO based SPI driver | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/config.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/spinlock.h> | |
19 | #include <linux/platform_device.h> | |
20 | ||
21 | #include <linux/spi/spi.h> | |
22 | #include <linux/spi/spi_bitbang.h> | |
23 | ||
24 | #include <asm/arch/regs-gpio.h> | |
25 | #include <asm/arch/spi-gpio.h> | |
26 | #include <asm/arch/hardware.h> | |
27 | ||
28 | struct s3c2410_spigpio { | |
29 | struct spi_bitbang bitbang; | |
30 | ||
31 | struct s3c2410_spigpio_info *info; | |
32 | struct platform_device *dev; | |
33 | }; | |
34 | ||
35 | static inline struct s3c2410_spigpio *spidev_to_sg(struct spi_device *spi) | |
36 | { | |
37 | return spi->controller_data; | |
38 | } | |
39 | ||
40 | static inline void setsck(struct spi_device *dev, int on) | |
41 | { | |
42 | struct s3c2410_spigpio *sg = spidev_to_sg(dev); | |
43 | s3c2410_gpio_setpin(sg->info->pin_clk, on ? 1 : 0); | |
44 | } | |
45 | ||
46 | static inline void setmosi(struct spi_device *dev, int on) | |
47 | { | |
48 | struct s3c2410_spigpio *sg = spidev_to_sg(dev); | |
49 | s3c2410_gpio_setpin(sg->info->pin_mosi, on ? 1 : 0); | |
50 | } | |
51 | ||
52 | static inline u32 getmiso(struct spi_device *dev) | |
53 | { | |
54 | struct s3c2410_spigpio *sg = spidev_to_sg(dev); | |
55 | return s3c2410_gpio_getpin(sg->info->pin_miso) ? 1 : 0; | |
56 | } | |
57 | ||
58 | #define spidelay(x) ndelay(x) | |
59 | ||
60 | #define EXPAND_BITBANG_TXRX | |
61 | #include <linux/spi/spi_bitbang.h> | |
62 | ||
63 | ||
64 | static u32 s3c2410_spigpio_txrx_mode0(struct spi_device *spi, | |
65 | unsigned nsecs, u32 word, u8 bits) | |
66 | { | |
67 | return bitbang_txrx_be_cpha0(spi, nsecs, 0, word, bits); | |
68 | } | |
69 | ||
70 | static u32 s3c2410_spigpio_txrx_mode1(struct spi_device *spi, | |
71 | unsigned nsecs, u32 word, u8 bits) | |
72 | { | |
73 | return bitbang_txrx_be_cpha1(spi, nsecs, 0, word, bits); | |
74 | } | |
75 | ||
76 | static void s3c2410_spigpio_chipselect(struct spi_device *dev, int value) | |
77 | { | |
78 | struct s3c2410_spigpio *sg = spidev_to_sg(dev); | |
79 | ||
80 | if (sg->info && sg->info->chip_select) | |
81 | (sg->info->chip_select)(sg->info, value); | |
82 | } | |
83 | ||
84 | static int s3c2410_spigpio_probe(struct platform_device *dev) | |
85 | { | |
86 | struct spi_master *master; | |
87 | struct s3c2410_spigpio *sp; | |
88 | int ret; | |
89 | int i; | |
90 | ||
91 | master = spi_alloc_master(&dev->dev, sizeof(struct s3c2410_spigpio)); | |
92 | if (master == NULL) { | |
93 | dev_err(&dev->dev, "failed to allocate spi master\n"); | |
94 | ret = -ENOMEM; | |
95 | goto err; | |
96 | } | |
97 | ||
98 | sp = spi_master_get_devdata(master); | |
99 | ||
100 | platform_set_drvdata(dev, sp); | |
101 | ||
102 | /* copy in the plkatform data */ | |
103 | sp->info = dev->dev.platform_data; | |
104 | ||
105 | /* setup spi bitbang adaptor */ | |
106 | sp->bitbang.master = spi_master_get(master); | |
107 | sp->bitbang.chipselect = s3c2410_spigpio_chipselect; | |
108 | ||
109 | sp->bitbang.txrx_word[SPI_MODE_0] = s3c2410_spigpio_txrx_mode0; | |
110 | sp->bitbang.txrx_word[SPI_MODE_1] = s3c2410_spigpio_txrx_mode1; | |
111 | ||
112 | /* set state of spi pins */ | |
113 | s3c2410_gpio_setpin(sp->info->pin_clk, 0); | |
114 | s3c2410_gpio_setpin(sp->info->pin_mosi, 0); | |
115 | ||
116 | s3c2410_gpio_cfgpin(sp->info->pin_clk, S3C2410_GPIO_OUTPUT); | |
117 | s3c2410_gpio_cfgpin(sp->info->pin_mosi, S3C2410_GPIO_OUTPUT); | |
118 | s3c2410_gpio_cfgpin(sp->info->pin_miso, S3C2410_GPIO_INPUT); | |
119 | ||
120 | ret = spi_bitbang_start(&sp->bitbang); | |
121 | if (ret) | |
122 | goto err_no_bitbang; | |
123 | ||
124 | /* register the chips to go with the board */ | |
125 | ||
126 | for (i = 0; i < sp->info->board_size; i++) { | |
127 | dev_info(&dev->dev, "registering %p: %s\n", | |
128 | &sp->info->board_info[i], | |
129 | sp->info->board_info[i].modalias); | |
130 | ||
131 | sp->info->board_info[i].controller_data = sp; | |
132 | spi_new_device(master, sp->info->board_info + i); | |
133 | } | |
134 | ||
135 | return 0; | |
136 | ||
137 | err_no_bitbang: | |
138 | spi_master_put(sp->bitbang.master); | |
139 | err: | |
140 | return ret; | |
141 | ||
142 | } | |
143 | ||
144 | static int s3c2410_spigpio_remove(struct platform_device *dev) | |
145 | { | |
146 | struct s3c2410_spigpio *sp = platform_get_drvdata(dev); | |
147 | ||
148 | spi_bitbang_stop(&sp->bitbang); | |
149 | spi_master_put(sp->bitbang.master); | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | /* all gpio should be held over suspend/resume, so we should | |
155 | * not need to deal with this | |
156 | */ | |
157 | ||
158 | #define s3c2410_spigpio_suspend NULL | |
159 | #define s3c2410_spigpio_resume NULL | |
160 | ||
161 | ||
162 | static struct platform_driver s3c2410_spigpio_drv = { | |
163 | .probe = s3c2410_spigpio_probe, | |
164 | .remove = s3c2410_spigpio_remove, | |
165 | .suspend = s3c2410_spigpio_suspend, | |
166 | .resume = s3c2410_spigpio_resume, | |
167 | .driver = { | |
168 | .name = "s3c24xx-spi-gpio", | |
169 | .owner = THIS_MODULE, | |
170 | }, | |
171 | }; | |
172 | ||
173 | static int __init s3c2410_spigpio_init(void) | |
174 | { | |
175 | return platform_driver_register(&s3c2410_spigpio_drv); | |
176 | } | |
177 | ||
178 | static void __exit s3c2410_spigpio_exit(void) | |
179 | { | |
180 | platform_driver_unregister(&s3c2410_spigpio_drv); | |
181 | } | |
182 | ||
183 | module_init(s3c2410_spigpio_init); | |
184 | module_exit(s3c2410_spigpio_exit); | |
185 | ||
186 | MODULE_DESCRIPTION("S3C24XX SPI Driver"); | |
187 | MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>"); | |
188 | MODULE_LICENSE("GPL"); |