blob: 0fa25e2e80fe556cbde8b1e01843f452129dfaea [file] [log] [blame]
Ben Dooks1fc75472006-05-20 15:00:17 -07001/* 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
Ben Dooks1fc75472006-05-20 15:00:17 -070014#include <linux/kernel.h>
15#include <linux/init.h>
16#include <linux/delay.h>
17#include <linux/spinlock.h>
Ben Dooks6d3a25f2006-12-22 01:11:45 -080018#include <linux/workqueue.h>
Ben Dooks1fc75472006-05-20 15:00:17 -070019#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>
Arnaud Patard (Rtpe2a5d2f2006-12-29 16:49:10 -080026#include <asm/hardware.h>
Ben Dooks1fc75472006-05-20 15:00:17 -070027
28struct s3c2410_spigpio {
29 struct spi_bitbang bitbang;
30
31 struct s3c2410_spigpio_info *info;
32 struct platform_device *dev;
33};
34
35static inline struct s3c2410_spigpio *spidev_to_sg(struct spi_device *spi)
36{
37 return spi->controller_data;
38}
39
40static 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
46static 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
52static 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
64static 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
70static 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
Harald Welted23c6c22007-02-20 13:58:19 -080076static u32 s3c2410_spigpio_txrx_mode2(struct spi_device *spi,
77 unsigned nsecs, u32 word, u8 bits)
78{
79 return bitbang_txrx_be_cpha0(spi, nsecs, 1, word, bits);
80}
81
82static u32 s3c2410_spigpio_txrx_mode3(struct spi_device *spi,
83 unsigned nsecs, u32 word, u8 bits)
84{
85 return bitbang_txrx_be_cpha1(spi, nsecs, 1, word, bits);
86}
87
88
Ben Dooks1fc75472006-05-20 15:00:17 -070089static void s3c2410_spigpio_chipselect(struct spi_device *dev, int value)
90{
91 struct s3c2410_spigpio *sg = spidev_to_sg(dev);
92
93 if (sg->info && sg->info->chip_select)
94 (sg->info->chip_select)(sg->info, value);
95}
96
97static int s3c2410_spigpio_probe(struct platform_device *dev)
98{
99 struct spi_master *master;
100 struct s3c2410_spigpio *sp;
101 int ret;
102 int i;
103
104 master = spi_alloc_master(&dev->dev, sizeof(struct s3c2410_spigpio));
105 if (master == NULL) {
106 dev_err(&dev->dev, "failed to allocate spi master\n");
107 ret = -ENOMEM;
108 goto err;
109 }
110
111 sp = spi_master_get_devdata(master);
112
113 platform_set_drvdata(dev, sp);
114
115 /* copy in the plkatform data */
116 sp->info = dev->dev.platform_data;
117
118 /* setup spi bitbang adaptor */
119 sp->bitbang.master = spi_master_get(master);
120 sp->bitbang.chipselect = s3c2410_spigpio_chipselect;
121
122 sp->bitbang.txrx_word[SPI_MODE_0] = s3c2410_spigpio_txrx_mode0;
123 sp->bitbang.txrx_word[SPI_MODE_1] = s3c2410_spigpio_txrx_mode1;
Harald Welted23c6c22007-02-20 13:58:19 -0800124 sp->bitbang.txrx_word[SPI_MODE_2] = s3c2410_spigpio_txrx_mode2;
125 sp->bitbang.txrx_word[SPI_MODE_3] = s3c2410_spigpio_txrx_mode3;
Ben Dooks1fc75472006-05-20 15:00:17 -0700126
127 /* set state of spi pins */
128 s3c2410_gpio_setpin(sp->info->pin_clk, 0);
129 s3c2410_gpio_setpin(sp->info->pin_mosi, 0);
130
131 s3c2410_gpio_cfgpin(sp->info->pin_clk, S3C2410_GPIO_OUTPUT);
132 s3c2410_gpio_cfgpin(sp->info->pin_mosi, S3C2410_GPIO_OUTPUT);
133 s3c2410_gpio_cfgpin(sp->info->pin_miso, S3C2410_GPIO_INPUT);
134
135 ret = spi_bitbang_start(&sp->bitbang);
136 if (ret)
137 goto err_no_bitbang;
138
139 /* register the chips to go with the board */
140
141 for (i = 0; i < sp->info->board_size; i++) {
142 dev_info(&dev->dev, "registering %p: %s\n",
143 &sp->info->board_info[i],
144 sp->info->board_info[i].modalias);
145
146 sp->info->board_info[i].controller_data = sp;
147 spi_new_device(master, sp->info->board_info + i);
148 }
149
150 return 0;
151
152 err_no_bitbang:
153 spi_master_put(sp->bitbang.master);
154 err:
155 return ret;
156
157}
158
159static int s3c2410_spigpio_remove(struct platform_device *dev)
160{
161 struct s3c2410_spigpio *sp = platform_get_drvdata(dev);
162
163 spi_bitbang_stop(&sp->bitbang);
164 spi_master_put(sp->bitbang.master);
165
166 return 0;
167}
168
169/* all gpio should be held over suspend/resume, so we should
170 * not need to deal with this
171*/
172
173#define s3c2410_spigpio_suspend NULL
174#define s3c2410_spigpio_resume NULL
175
176
177static struct platform_driver s3c2410_spigpio_drv = {
178 .probe = s3c2410_spigpio_probe,
179 .remove = s3c2410_spigpio_remove,
180 .suspend = s3c2410_spigpio_suspend,
181 .resume = s3c2410_spigpio_resume,
182 .driver = {
David Brownellfc3ba952007-08-30 23:56:24 -0700183 .name = "spi_s3c24xx_gpio",
Ben Dooks1fc75472006-05-20 15:00:17 -0700184 .owner = THIS_MODULE,
185 },
186};
187
188static int __init s3c2410_spigpio_init(void)
189{
190 return platform_driver_register(&s3c2410_spigpio_drv);
191}
192
193static void __exit s3c2410_spigpio_exit(void)
194{
195 platform_driver_unregister(&s3c2410_spigpio_drv);
196}
197
198module_init(s3c2410_spigpio_init);
199module_exit(s3c2410_spigpio_exit);
200
201MODULE_DESCRIPTION("S3C24XX SPI Driver");
202MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
203MODULE_LICENSE("GPL");