target/linux/generic-2.6/patches-2.6.28/921-gpio_spi_driver.patch

   1 THIS CODE IS DEPRECATED.
   2
   3 Please use the new mainline SPI-GPIO driver, as of 2.6.29.
   4
   5 --mb
   6
   7
   8
   9 --- /dev/null
  10 +++ b/include/linux/spi/spi_gpio_old.h
  11 @@ -0,0 +1,73 @@
  12 +/*
  13 + * spi_gpio interface to platform code
  14 + *
  15 + * Copyright (c) 2008 Piotr Skamruk
  16 + * Copyright (c) 2008 Michael Buesch
  17 + *
  18 + * This program is free software; you can redistribute it and/or modify
  19 + * it under the terms of the GNU General Public License version 2 as
  20 + * published by the Free Software Foundation.
  21 + */
  22 +#ifndef _LINUX_SPI_SPI_GPIO
  23 +#define _LINUX_SPI_SPI_GPIO
  24 +
  25 +#include <linux/types.h>
  26 +#include <linux/spi/spi.h>
  27 +
  28 +
  29 +/**
  30 + * struct spi_gpio_platform_data - Data definitions for a SPI-GPIO device.
  31 + *
  32 + * This structure holds information about a GPIO-based SPI device.
  33 + *
  34 + * @pin_clk: The GPIO pin number of the CLOCK pin.
  35 + *
  36 + * @pin_miso: The GPIO pin number of the MISO pin.
  37 + *
  38 + * @pin_mosi: The GPIO pin number of the MOSI pin.
  39 + *
  40 + * @pin_cs: The GPIO pin number of the CHIPSELECT pin.
  41 + *
  42 + * @cs_activelow: If true, the chip is selected when the CS line is low.
  43 + *
  44 + * @no_spi_delay: If true, no delay is done in the lowlevel bitbanging.
  45 + *                Note that doing no delay is not standards compliant,
  46 + *                but it might be needed to speed up transfers on some
  47 + *                slow embedded machines.
  48 + *
  49 + * @boardinfo_setup: This callback is called after the
  50 + *                   SPI master device was registered, but before the
  51 + *                   device is registered.
  52 + * @boardinfo_setup_data: Data argument passed to boardinfo_setup().
  53 + */
  54 +struct spi_gpio_platform_data {
  55 +       unsigned int pin_clk;
  56 +       unsigned int pin_miso;
  57 +       unsigned int pin_mosi;
  58 +       unsigned int pin_cs;
  59 +       bool cs_activelow;
  60 +       bool no_spi_delay;
  61 +       int (*boardinfo_setup)(struct spi_board_info *bi,
  62 +                              struct spi_master *master,
  63 +                              void *data);
  64 +       void *boardinfo_setup_data;
  65 +};
  66 +
  67 +/**
  68 + * SPI_GPIO_PLATDEV_NAME - The platform device name string.
  69 + *
  70 + * The name string that has to be used for platform_device_alloc
  71 + * when allocating a spi-gpio device.
  72 + */
  73 +#define SPI_GPIO_PLATDEV_NAME  "spi-gpio"
  74 +
  75 +/**
  76 + * spi_gpio_next_id - Get another platform device ID number.
  77 + *
  78 + * This returns the next platform device ID number that has to be used
  79 + * for platform_device_alloc. The ID is opaque and should not be used for
  80 + * anything else.
  81 + */
  82 +int spi_gpio_next_id(void);
  83 +
  84 +#endif /* _LINUX_SPI_SPI_GPIO */
  85 --- /dev/null
  86 +++ b/drivers/spi/spi_gpio_old.c
  87 @@ -0,0 +1,251 @@
  88 +/*
  89 + * Bitbanging SPI bus driver using GPIO API
  90 + *
  91 + * Copyright (c) 2008 Piotr Skamruk
  92 + * Copyright (c) 2008 Michael Buesch
  93 + *
  94 + * based on spi_s3c2410_gpio.c
  95 + *   Copyright (c) 2006 Ben Dooks
  96 + *   Copyright (c) 2006 Simtec Electronics
  97 + * and on i2c-gpio.c
  98 + *   Copyright (C) 2007 Atmel Corporation
  99 + *
 100 + * This program is free software; you can redistribute it and/or modify
 101 + * it under the terms of the GNU General Public License version 2 as
 102 + * published by the Free Software Foundation.
 103 + */
 104 +
 105 +#include <linux/kernel.h>
 106 +#include <linux/init.h>
 107 +#include <linux/delay.h>
 108 +#include <linux/spinlock.h>
 109 +#include <linux/workqueue.h>
 110 +#include <linux/module.h>
 111 +#include <linux/platform_device.h>
 112 +#include <linux/spi/spi.h>
 113 +#include <linux/spi/spi_bitbang.h>
 114 +#include <linux/spi/spi_gpio_old.h>
 115 +#include <linux/gpio.h>
 116 +#include <asm/atomic.h>
 117 +
 118 +
 119 +struct spi_gpio {
 120 +       struct spi_bitbang bitbang;
 121 +       struct spi_gpio_platform_data *info;
 122 +       struct platform_device *pdev;
 123 +       struct spi_board_info bi;
 124 +};
 125 +
 126 +
 127 +static inline struct spi_gpio *spidev_to_sg(struct spi_device *dev)
 128 +{
 129 +       return dev->controller_data;
 130 +}
 131 +
 132 +static inline void setsck(struct spi_device *dev, int val)
 133 +{
 134 +       struct spi_gpio *sp = spidev_to_sg(dev);
 135 +       gpio_set_value(sp->info->pin_clk, val ? 1 : 0);
 136 +}
 137 +
 138 +static inline void setmosi(struct spi_device *dev, int val)
 139 +{
 140 +       struct spi_gpio *sp = spidev_to_sg(dev);
 141 +       gpio_set_value(sp->info->pin_mosi, val ? 1 : 0);
 142 +}
 143 +
 144 +static inline u32 getmiso(struct spi_device *dev)
 145 +{
 146 +       struct spi_gpio *sp = spidev_to_sg(dev);
 147 +       return gpio_get_value(sp->info->pin_miso) ? 1 : 0;
 148 +}
 149 +
 150 +static inline void do_spidelay(struct spi_device *dev, unsigned nsecs)
 151 +{
 152 +       struct spi_gpio *sp = spidev_to_sg(dev);
 153 +
 154 +       if (!sp->info->no_spi_delay)
 155 +               ndelay(nsecs);
 156 +}
 157 +
 158 +#define spidelay(nsecs) do {                                   \
 159 +       /* Steal the spi_device pointer from our caller.        \
 160 +        * The bitbang-API should probably get fixed here... */ \
 161 +       do_spidelay(spi, nsecs);                                \
 162 +  } while (0)
 163 +
 164 +#define EXPAND_BITBANG_TXRX
 165 +#include <linux/spi/spi_bitbang.h>
 166 +
 167 +static u32 spi_gpio_txrx_mode0(struct spi_device *spi,
 168 +                              unsigned nsecs, u32 word, u8 bits)
 169 +{
 170 +       return bitbang_txrx_be_cpha0(spi, nsecs, 0, word, bits);
 171 +}
 172 +
 173 +static u32 spi_gpio_txrx_mode1(struct spi_device *spi,
 174 +                              unsigned nsecs, u32 word, u8 bits)
 175 +{
 176 +       return bitbang_txrx_be_cpha1(spi, nsecs, 0, word, bits);
 177 +}
 178 +
 179 +static u32 spi_gpio_txrx_mode2(struct spi_device *spi,
 180 +                              unsigned nsecs, u32 word, u8 bits)
 181 +{
 182 +       return bitbang_txrx_be_cpha0(spi, nsecs, 1, word, bits);
 183 +}
 184 +
 185 +static u32 spi_gpio_txrx_mode3(struct spi_device *spi,
 186 +                              unsigned nsecs, u32 word, u8 bits)
 187 +{
 188 +       return bitbang_txrx_be_cpha1(spi, nsecs, 1, word, bits);
 189 +}
 190 +
 191 +static void spi_gpio_chipselect(struct spi_device *dev, int on)
 192 +{
 193 +       struct spi_gpio *sp = spidev_to_sg(dev);
 194 +
 195 +       if (sp->info->cs_activelow)
 196 +               on = !on;
 197 +       gpio_set_value(sp->info->pin_cs, on ? 1 : 0);
 198 +}
 199 +
 200 +static int spi_gpio_probe(struct platform_device *pdev)
 201 +{
 202 +       struct spi_master *master;
 203 +       struct spi_gpio_platform_data *pdata;
 204 +       struct spi_gpio *sp;
 205 +       struct spi_device *spidev;
 206 +       int err;
 207 +
 208 +       pdata = pdev->dev.platform_data;
 209 +       if (!pdata)
 210 +               return -ENXIO;
 211 +
 212 +       err = -ENOMEM;
 213 +       master = spi_alloc_master(&pdev->dev, sizeof(struct spi_gpio));
 214 +       if (!master)
 215 +               goto err_alloc_master;
 216 +
 217 +       sp = spi_master_get_devdata(master);
 218 +       platform_set_drvdata(pdev, sp);
 219 +       sp->info = pdata;
 220 +
 221 +       err = gpio_request(pdata->pin_clk, "spi_clock");
 222 +       if (err)
 223 +               goto err_request_clk;
 224 +       err = gpio_request(pdata->pin_mosi, "spi_mosi");
 225 +       if (err)
 226 +               goto err_request_mosi;
 227 +       err = gpio_request(pdata->pin_miso, "spi_miso");
 228 +       if (err)
 229 +               goto err_request_miso;
 230 +       err = gpio_request(pdata->pin_cs, "spi_cs");
 231 +       if (err)
 232 +               goto err_request_cs;
 233 +
 234 +       sp->bitbang.master = spi_master_get(master);
 235 +       sp->bitbang.master->bus_num = -1;
 236 +       sp->bitbang.master->num_chipselect = 1;
 237 +       sp->bitbang.chipselect = spi_gpio_chipselect;
 238 +       sp->bitbang.txrx_word[SPI_MODE_0] = spi_gpio_txrx_mode0;
 239 +       sp->bitbang.txrx_word[SPI_MODE_1] = spi_gpio_txrx_mode1;
 240 +       sp->bitbang.txrx_word[SPI_MODE_2] = spi_gpio_txrx_mode2;
 241 +       sp->bitbang.txrx_word[SPI_MODE_3] = spi_gpio_txrx_mode3;
 242 +
 243 +       gpio_direction_output(pdata->pin_clk, 0);
 244 +       gpio_direction_output(pdata->pin_mosi, 0);
 245 +       gpio_direction_output(pdata->pin_cs,
 246 +                             pdata->cs_activelow ? 1 : 0);
 247 +       gpio_direction_input(pdata->pin_miso);
 248 +
 249 +       err = spi_bitbang_start(&sp->bitbang);
 250 +       if (err)
 251 +               goto err_no_bitbang;
 252 +       err = pdata->boardinfo_setup(&sp->bi, master,
 253 +                                    pdata->boardinfo_setup_data);
 254 +       if (err)
 255 +               goto err_bi_setup;
 256 +       sp->bi.controller_data = sp;
 257 +       spidev = spi_new_device(master, &sp->bi);
 258 +       if (!spidev)
 259 +               goto err_new_dev;
 260 +
 261 +       return 0;
 262 +
 263 +err_new_dev:
 264 +err_bi_setup:
 265 +       spi_bitbang_stop(&sp->bitbang);
 266 +err_no_bitbang:
 267 +       spi_master_put(sp->bitbang.master);
 268 +       gpio_free(pdata->pin_cs);
 269 +err_request_cs:
 270 +       gpio_free(pdata->pin_miso);
 271 +err_request_miso:
 272 +       gpio_free(pdata->pin_mosi);
 273 +err_request_mosi:
 274 +       gpio_free(pdata->pin_clk);
 275 +err_request_clk:
 276 +       kfree(master);
 277 +
 278 +err_alloc_master:
 279 +       return err;
 280 +}
 281 +
 282 +static int __devexit spi_gpio_remove(struct platform_device *pdev)
 283 +{
 284 +       struct spi_gpio *sp;
 285 +       struct spi_gpio_platform_data *pdata;
 286 +
 287 +       pdata = pdev->dev.platform_data;
 288 +       sp = platform_get_drvdata(pdev);
 289 +
 290 +       gpio_free(pdata->pin_clk);
 291 +       gpio_free(pdata->pin_mosi);
 292 +       gpio_free(pdata->pin_miso);
 293 +       gpio_free(pdata->pin_cs);
 294 +       spi_bitbang_stop(&sp->bitbang);
 295 +       spi_master_put(sp->bitbang.master);
 296 +
 297 +       return 0;
 298 +}
 299 +
 300 +static struct platform_driver spi_gpio_driver = {
 301 +       .driver         = {
 302 +               .name   = SPI_GPIO_PLATDEV_NAME,
 303 +               .owner  = THIS_MODULE,
 304 +       },
 305 +       .probe          = spi_gpio_probe,
 306 +       .remove         = __devexit_p(spi_gpio_remove),
 307 +};
 308 +
 309 +int spi_gpio_next_id(void)
 310 +{
 311 +       static atomic_t counter = ATOMIC_INIT(-1);
 312 +
 313 +       return atomic_inc_return(&counter);
 314 +}
 315 +EXPORT_SYMBOL(spi_gpio_next_id);
 316 +
 317 +static int __init spi_gpio_init(void)
 318 +{
 319 +       int err;
 320 +
 321 +       err = platform_driver_register(&spi_gpio_driver);
 322 +       if (err)
 323 +               printk(KERN_ERR "spi-gpio: register failed: %d\n", err);
 324 +
 325 +       return err;
 326 +}
 327 +module_init(spi_gpio_init);
 328 +
 329 +static void __exit spi_gpio_exit(void)
 330 +{
 331 +       platform_driver_unregister(&spi_gpio_driver);
 332 +}
 333 +module_exit(spi_gpio_exit);
 334 +
 335 +MODULE_AUTHOR("Piot Skamruk <piotr.skamruk at gmail.com>");
 336 +MODULE_AUTHOR("Michael Buesch");
 337 +MODULE_DESCRIPTION("Platform independent GPIO bitbanging SPI driver");
 338 +MODULE_LICENSE("GPL v2");
 339 --- a/drivers/spi/Kconfig
 340 +++ b/drivers/spi/Kconfig
 341 @@ -116,6 +116,15 @@ config SPI_GPIO
 342           GPIO operations, you should be able to leverage that for better
 343           speed with a custom version of this driver; see the source code.
 344
 345 +config SPI_GPIO_OLD
 346 +       tristate "Old GPIO API based bitbanging SPI controller (DEPRECATED)"
 347 +       depends on SPI_MASTER && GENERIC_GPIO
 348 +       select SPI_BITBANG
 349 +       help
 350 +         This code is deprecated. Please use the new mainline SPI-GPIO driver.
 351 +
 352 +         If unsure, say N.
 353 +
 354  config SPI_IMX
 355         tristate "Freescale iMX SPI controller"
 356         depends on ARCH_IMX && EXPERIMENTAL
 357 --- a/drivers/spi/Makefile
 358 +++ b/drivers/spi/Makefile
 359 @@ -17,6 +17,7 @@ obj-$(CONFIG_SPI_BITBANG)             += spi_bitban
 360  obj-$(CONFIG_SPI_AU1550)               += au1550_spi.o
 361  obj-$(CONFIG_SPI_BUTTERFLY)            += spi_butterfly.o
 362  obj-$(CONFIG_SPI_GPIO)                 += spi_gpio.o
 363 +obj-$(CONFIG_SPI_GPIO_OLD)             += spi_gpio_old.o
 364  obj-$(CONFIG_SPI_IMX)                  += spi_imx.o
 365  obj-$(CONFIG_SPI_LM70_LLP)             += spi_lm70llp.o
 366  obj-$(CONFIG_SPI_PXA2XX)               += pxa2xx_spi.o