target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-spi-gpio.c

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