1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
|
/*
* Copyright (C) 2007 Openmoko, Inc.
* Author: Harald Welte <laforge@openmoko.org>
*
* Smedia Glamo GPIO based SPI driver
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This driver currently only implements a minimum subset of the hardware
* features, esp. those features that are required to drive the jbt6k74
* LCM controller asic in the TD028TTEC1 LCM.
*
*/
#define DEBUG
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>
#include <linux/spi/spi.h>
#include <linux/spi/spi_bitbang.h>
#include <linux/spi/glamo.h>
#include <linux/glamofb.h>
#include <mach/hardware.h>
#include "glamo-core.h"
#include "glamo-regs.h"
struct glamo_spigpio {
struct spi_bitbang bitbang;
struct spi_master *master;
struct glamo_spigpio_info *info;
struct glamo_core *glamo;
};
static inline struct glamo_spigpio *to_sg(struct spi_device *spi)
{
return dev_get_drvdata(&spi->master->dev);
}
static inline void setsck(struct spi_device *dev, int on)
{
struct glamo_spigpio *sg = to_sg(dev);
glamo_gpio_setpin(sg->glamo, sg->info->pin_clk, on ? 1 : 0);
}
static inline void setmosi(struct spi_device *dev, int on)
{
struct glamo_spigpio *sg = to_sg(dev);
glamo_gpio_setpin(sg->glamo, sg->info->pin_mosi, on ? 1 : 0);
}
static inline u32 getmiso(struct spi_device *dev)
{
struct glamo_spigpio *sg = to_sg(dev);
if (sg->info->pin_miso)
return glamo_gpio_getpin(sg->glamo, sg->info->pin_miso) ? 1 : 0;
else
return 0;
}
#define spidelay(x) ndelay(x)
#define EXPAND_BITBANG_TXRX
#include <linux/spi/spi_bitbang.h>
static u32 glamo_spigpio_txrx_mode0(struct spi_device *spi,
unsigned nsecs, u32 word, u8 bits)
{
return bitbang_txrx_be_cpha0(spi, nsecs, 0, word, bits);
}
static u32 glamo_spigpio_txrx_mode1(struct spi_device *spi,
unsigned nsecs, u32 word, u8 bits)
{
return bitbang_txrx_be_cpha1(spi, nsecs, 0, word, bits);
}
static u32 glamo_spigpio_txrx_mode2(struct spi_device *spi,
unsigned nsecs, u32 word, u8 bits)
{
return bitbang_txrx_be_cpha0(spi, nsecs, 1, word, bits);
}
static u32 glamo_spigpio_txrx_mode3(struct spi_device *spi,
unsigned nsecs, u32 word, u8 bits)
{
return bitbang_txrx_be_cpha1(spi, nsecs, 1, word, bits);
}
#if 0
static int glamo_spigpio_setupxfer(struct spi_device *spi,
struct spi_transfer *t)
{
struct glamo_spi *gs = to_sg(spi);
unsigned int bpw;
bpw = t ? t->bits_per_word : spi->bits_per_word;
if (bpw != 9 && bpw != 8) {
dev_err(&spi->dev, "invalid bits-per-word (%d)\n", bpw);
return -EINVAL;
}
return 0;
}
#endif
static void glamo_spigpio_chipsel(struct spi_device *spi, int value)
{
struct glamo_spigpio *gs = to_sg(spi);
#if 0
dev_dbg(&spi->dev, "chipsel %d: spi=%p, gs=%p, info=%p, handle=%p\n",
value, spi, gs, gs->info, gs->info->glamo);
#endif
glamo_gpio_setpin(gs->glamo, gs->info->pin_cs, value ? 0 : 1);
}
static int glamo_spigpio_probe(struct platform_device *pdev)
{
struct spi_master *master;
struct glamo_spigpio *sp;
int ret;
master = spi_alloc_master(&pdev->dev, sizeof(struct glamo_spigpio));
if (master == NULL) {
dev_err(&pdev->dev, "failed to allocate spi master\n");
ret = -ENOMEM;
goto err;
}
sp = spi_master_get_devdata(master);
platform_set_drvdata(pdev, sp);
sp->info = pdev->dev.platform_data;
if (!sp->info) {
dev_err(&pdev->dev, "can't operate without platform data\n");
ret = -EIO;
goto err_no_pdev;
}
master->num_chipselect = 1;
master->bus_num = 2; /* FIXME: use dynamic number */
sp->master = spi_master_get(master);
sp->glamo = sp->info->glamo;
sp->bitbang.master = sp->master;
sp->bitbang.chipselect = glamo_spigpio_chipsel;
sp->bitbang.txrx_word[SPI_MODE_0] = glamo_spigpio_txrx_mode0;
sp->bitbang.txrx_word[SPI_MODE_1] = glamo_spigpio_txrx_mode1;
sp->bitbang.txrx_word[SPI_MODE_2] = glamo_spigpio_txrx_mode2;
sp->bitbang.txrx_word[SPI_MODE_3] = glamo_spigpio_txrx_mode3;
/* set state of spi pins */
glamo_gpio_setpin(sp->glamo, sp->info->pin_clk, 0);
glamo_gpio_setpin(sp->glamo, sp->info->pin_mosi, 0);
glamo_gpio_setpin(sp->glamo, sp->info->pin_cs, 1);
glamo_gpio_cfgpin(sp->glamo, sp->info->pin_clk);
glamo_gpio_cfgpin(sp->glamo, sp->info->pin_mosi);
glamo_gpio_cfgpin(sp->glamo, sp->info->pin_cs);
if (sp->info->pin_miso)
glamo_gpio_cfgpin(sp->glamo, sp->info->pin_miso);
/* bring the LCM panel out of reset if it isn't already */
glamo_gpio_setpin(sp->glamo, GLAMO_GPIO4, 1);
glamo_gpio_cfgpin(sp->glamo, GLAMO_GPIO4_OUTPUT);
msleep(90);
#if 0
sp->dev = &pdev->dev;
sp->bitbang.setup_transfer = glamo_spi_setupxfer;
sp->bitbang.txrx_bufs = glamo_spi_txrx;
sp->bitbang.master->setup = glamo_spi_setup;
#endif
dev_set_drvdata(&sp->master->dev, sp);
ret = spi_bitbang_start(&sp->bitbang);
if (ret)
goto err_no_bitbang;
return 0;
err_no_bitbang:
platform_set_drvdata(pdev, NULL);
err_no_pdev:
spi_master_put(sp->bitbang.master);
err:
return ret;
}
static int glamo_spigpio_remove(struct platform_device *pdev)
{
struct glamo_spigpio *sp = platform_get_drvdata(pdev);
spi_bitbang_stop(&sp->bitbang);
spi_master_put(sp->bitbang.master);
return 0;
}
/*#define glamo_spigpio_suspend NULL
#define glamo_spigpio_resume NULL
*/
#ifdef CONFIG_PM
static int glamo_spigpio_suspend(struct platform_device *pdev, pm_message_t state)
{
return 0;
}
static int glamo_spigpio_resume(struct platform_device *pdev)
{
struct glamo_spigpio *sp = platform_get_drvdata(pdev);
if (!sp)
return 0;
/* set state of spi pins */
glamo_gpio_setpin(sp->glamo, sp->info->pin_clk, 0);
glamo_gpio_setpin(sp->glamo, sp->info->pin_mosi, 0);
glamo_gpio_setpin(sp->glamo, sp->info->pin_cs, 1);
glamo_gpio_cfgpin(sp->glamo, sp->info->pin_clk);
glamo_gpio_cfgpin(sp->glamo, sp->info->pin_mosi);
glamo_gpio_cfgpin(sp->glamo, sp->info->pin_cs);
if (sp->info->pin_miso)
glamo_gpio_cfgpin(sp->glamo, sp->info->pin_miso);
return 0;
}
#endif
static struct platform_driver glamo_spi_drv = {
.probe = glamo_spigpio_probe,
.remove = glamo_spigpio_remove,
#ifdef CONFIG_PM
.suspend_late = glamo_spigpio_suspend,
.resume_early = glamo_spigpio_resume,
#endif
.driver = {
.name = "glamo-spi-gpio",
.owner = THIS_MODULE,
},
};
static int __init glamo_spi_init(void)
{
return platform_driver_register(&glamo_spi_drv);
}
static void __exit glamo_spi_exit(void)
{
platform_driver_unregister(&glamo_spi_drv);
}
module_init(glamo_spi_init);
module_exit(glamo_spi_exit);
MODULE_DESCRIPTION("Smedia Glamo 336x/337x LCM serial command SPI Driver");
MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>")
MODULE_LICENSE("GPL");
|
