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 Index: linux-2.6.28.2/include/linux/spi/spi_gpio_old.h
  10 ===================================================================
  11 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
  12 +++ linux-2.6.28.2/include/linux/spi/spi_gpio_old.h     2009-02-10 17:14:33.000000000 +0100
  13 @@ -0,0 +1,73 @@
  14 +/*
  15 + * spi_gpio interface to platform code
  16 + *
  17 + * Copyright (c) 2008 Piotr Skamruk
  18 + * Copyright (c) 2008 Michael Buesch
  19 + *
  20 + * This program is free software; you can redistribute it and/or modify
  21 + * it under the terms of the GNU General Public License version 2 as
  22 + * published by the Free Software Foundation.
  23 + */
  24 +#ifndef _LINUX_SPI_SPI_GPIO
  25 +#define _LINUX_SPI_SPI_GPIO
  26 +
  27 +#include <linux/types.h>
  28 +#include <linux/spi/spi.h>
  29 +
  30 +
  31 +/**
  32 + * struct spi_gpio_platform_data - Data definitions for a SPI-GPIO device.
  33 + *
  34 + * This structure holds information about a GPIO-based SPI device.
  35 + *
  36 + * @pin_clk: The GPIO pin number of the CLOCK pin.
  37 + *
  38 + * @pin_miso: The GPIO pin number of the MISO pin.
  39 + *
  40 + * @pin_mosi: The GPIO pin number of the MOSI pin.
  41 + *
  42 + * @pin_cs: The GPIO pin number of the CHIPSELECT pin.
  43 + *
  44 + * @cs_activelow: If true, the chip is selected when the CS line is low.
  45 + *
  46 + * @no_spi_delay: If true, no delay is done in the lowlevel bitbanging.
  47 + *                Note that doing no delay is not standards compliant,
  48 + *                but it might be needed to speed up transfers on some
  49 + *                slow embedded machines.
  50 + *
  51 + * @boardinfo_setup: This callback is called after the
  52 + *                   SPI master device was registered, but before the
  53 + *                   device is registered.
  54 + * @boardinfo_setup_data: Data argument passed to boardinfo_setup().
  55 + */
  56 +struct spi_gpio_platform_data {
  57 +       unsigned int pin_clk;
  58 +       unsigned int pin_miso;
  59 +       unsigned int pin_mosi;
  60 +       unsigned int pin_cs;
  61 +       bool cs_activelow;
  62 +       bool no_spi_delay;
  63 +       int (*boardinfo_setup)(struct spi_board_info *bi,
  64 +                              struct spi_master *master,
  65 +                              void *data);
  66 +       void *boardinfo_setup_data;
  67 +};
  68 +
  69 +/**
  70 + * SPI_GPIO_PLATDEV_NAME - The platform device name string.
  71 + *
  72 + * The name string that has to be used for platform_device_alloc
  73 + * when allocating a spi-gpio device.
  74 + */
  75 +#define SPI_GPIO_PLATDEV_NAME  "spi-gpio"
  76 +
  77 +/**
  78 + * spi_gpio_next_id - Get another platform device ID number.
  79 + *
  80 + * This returns the next platform device ID number that has to be used
  81 + * for platform_device_alloc. The ID is opaque and should not be used for
  82 + * anything else.
  83 + */
  84 +int spi_gpio_next_id(void);
  85 +
  86 +#endif /* _LINUX_SPI_SPI_GPIO */
  87 Index: linux-2.6.28.2/drivers/spi/spi_gpio_old.c
  88 ===================================================================
  89 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
  90 +++ linux-2.6.28.2/drivers/spi/spi_gpio_old.c   2009-02-10 17:15:01.000000000 +0100
  91 @@ -0,0 +1,251 @@
  92 +/*
  93 + * Bitbanging SPI bus driver using GPIO API
  94 + *
  95 + * Copyright (c) 2008 Piotr Skamruk
  96 + * Copyright (c) 2008 Michael Buesch
  97 + *
  98 + * based on spi_s3c2410_gpio.c
  99 + *   Copyright (c) 2006 Ben Dooks
 100 + *   Copyright (c) 2006 Simtec Electronics
 101 + * and on i2c-gpio.c
 102 + *   Copyright (C) 2007 Atmel Corporation
 103 + *
 104 + * This program is free software; you can redistribute it and/or modify
 105 + * it under the terms of the GNU General Public License version 2 as
 106 + * published by the Free Software Foundation.
 107 + */
 108 +
 109 +#include <linux/kernel.h>
 110 +#include <linux/init.h>
 111 +#include <linux/delay.h>
 112 +#include <linux/spinlock.h>
 113 +#include <linux/workqueue.h>
 114 +#include <linux/module.h>
 115 +#include <linux/platform_device.h>
 116 +#include <linux/spi/spi.h>
 117 +#include <linux/spi/spi_bitbang.h>
 118 +#include <linux/spi/spi_gpio_old.h>
 119 +#include <linux/gpio.h>
 120 +#include <asm/atomic.h>
 121 +
 122 +
 123 +struct spi_gpio {
 124 +       struct spi_bitbang bitbang;
 125 +       struct spi_gpio_platform_data *info;
 126 +       struct platform_device *pdev;
 127 +       struct spi_board_info bi;
 128 +};
 129 +
 130 +
 131 +static inline struct spi_gpio *spidev_to_sg(struct spi_device *dev)
 132 +{
 133 +       return dev->controller_data;
 134 +}
 135 +
 136 +static inline void setsck(struct spi_device *dev, int val)
 137 +{
 138 +       struct spi_gpio *sp = spidev_to_sg(dev);
 139 +       gpio_set_value(sp->info->pin_clk, val ? 1 : 0);
 140 +}
 141 +
 142 +static inline void setmosi(struct spi_device *dev, int val)
 143 +{
 144 +       struct spi_gpio *sp = spidev_to_sg(dev);
 145 +       gpio_set_value(sp->info->pin_mosi, val ? 1 : 0);
 146 +}
 147 +
 148 +static inline u32 getmiso(struct spi_device *dev)
 149 +{
 150 +       struct spi_gpio *sp = spidev_to_sg(dev);
 151 +       return gpio_get_value(sp->info->pin_miso) ? 1 : 0;
 152 +}
 153 +
 154 +static inline void do_spidelay(struct spi_device *dev, unsigned nsecs)
 155 +{
 156 +       struct spi_gpio *sp = spidev_to_sg(dev);
 157 +
 158 +       if (!sp->info->no_spi_delay)
 159 +               ndelay(nsecs);
 160 +}
 161 +
 162 +#define spidelay(nsecs) do {                                   \
 163 +       /* Steal the spi_device pointer from our caller.        \
 164 +        * The bitbang-API should probably get fixed here... */ \
 165 +       do_spidelay(spi, nsecs);                                \
 166 +  } while (0)
 167 +
 168 +#define EXPAND_BITBANG_TXRX
 169 +#include <linux/spi/spi_bitbang.h>
 170 +
 171 +static u32 spi_gpio_txrx_mode0(struct spi_device *spi,
 172 +                              unsigned nsecs, u32 word, u8 bits)
 173 +{
 174 +       return bitbang_txrx_be_cpha0(spi, nsecs, 0, word, bits);
 175 +}
 176 +
 177 +static u32 spi_gpio_txrx_mode1(struct spi_device *spi,
 178 +                              unsigned nsecs, u32 word, u8 bits)
 179 +{
 180 +       return bitbang_txrx_be_cpha1(spi, nsecs, 0, word, bits);
 181 +}
 182 +
 183 +static u32 spi_gpio_txrx_mode2(struct spi_device *spi,
 184 +                              unsigned nsecs, u32 word, u8 bits)
 185 +{
 186 +       return bitbang_txrx_be_cpha0(spi, nsecs, 1, word, bits);
 187 +}
 188 +
 189 +static u32 spi_gpio_txrx_mode3(struct spi_device *spi,
 190 +                              unsigned nsecs, u32 word, u8 bits)
 191 +{
 192 +       return bitbang_txrx_be_cpha1(spi, nsecs, 1, word, bits);
 193 +}
 194 +
 195 +static void spi_gpio_chipselect(struct spi_device *dev, int on)
 196 +{
 197 +       struct spi_gpio *sp = spidev_to_sg(dev);
 198 +
 199 +       if (sp->info->cs_activelow)
 200 +               on = !on;
 201 +       gpio_set_value(sp->info->pin_cs, on ? 1 : 0);
 202 +}
 203 +
 204 +static int spi_gpio_probe(struct platform_device *pdev)
 205 +{
 206 +       struct spi_master *master;
 207 +       struct spi_gpio_platform_data *pdata;
 208 +       struct spi_gpio *sp;
 209 +       struct spi_device *spidev;
 210 +       int err;
 211 +
 212 +       pdata = pdev->dev.platform_data;
 213 +       if (!pdata)
 214 +               return -ENXIO;
 215 +
 216 +       err = -ENOMEM;
 217 +       master = spi_alloc_master(&pdev->dev, sizeof(struct spi_gpio));
 218 +       if (!master)
 219 +               goto err_alloc_master;
 220 +
 221 +       sp = spi_master_get_devdata(master);
 222 +       platform_set_drvdata(pdev, sp);
 223 +       sp->info = pdata;
 224 +
 225 +       err = gpio_request(pdata->pin_clk, "spi_clock");
 226 +       if (err)
 227 +               goto err_request_clk;
 228 +       err = gpio_request(pdata->pin_mosi, "spi_mosi");
 229 +       if (err)
 230 +               goto err_request_mosi;
 231 +       err = gpio_request(pdata->pin_miso, "spi_miso");
 232 +       if (err)
 233 +               goto err_request_miso;
 234 +       err = gpio_request(pdata->pin_cs, "spi_cs");
 235 +       if (err)
 236 +               goto err_request_cs;
 237 +
 238 +       sp->bitbang.master = spi_master_get(master);
 239 +       sp->bitbang.master->bus_num = -1;
 240 +       sp->bitbang.master->num_chipselect = 1;
 241 +       sp->bitbang.chipselect = spi_gpio_chipselect;
 242 +       sp->bitbang.txrx_word[SPI_MODE_0] = spi_gpio_txrx_mode0;
 243 +       sp->bitbang.txrx_word[SPI_MODE_1] = spi_gpio_txrx_mode1;
 244 +       sp->bitbang.txrx_word[SPI_MODE_2] = spi_gpio_txrx_mode2;
 245 +       sp->bitbang.txrx_word[SPI_MODE_3] = spi_gpio_txrx_mode3;
 246 +
 247 +       gpio_direction_output(pdata->pin_clk, 0);
 248 +       gpio_direction_output(pdata->pin_mosi, 0);
 249 +       gpio_direction_output(pdata->pin_cs,
 250 +                             pdata->cs_activelow ? 1 : 0);
 251 +       gpio_direction_input(pdata->pin_miso);
 252 +
 253 +       err = spi_bitbang_start(&sp->bitbang);
 254 +       if (err)
 255 +               goto err_no_bitbang;
 256 +       err = pdata->boardinfo_setup(&sp->bi, master,
 257 +                                    pdata->boardinfo_setup_data);
 258 +       if (err)
 259 +               goto err_bi_setup;
 260 +       sp->bi.controller_data = sp;
 261 +       spidev = spi_new_device(master, &sp->bi);
 262 +       if (!spidev)
 263 +               goto err_new_dev;
 264 +
 265 +       return 0;
 266 +
 267 +err_new_dev:
 268 +err_bi_setup:
 269 +       spi_bitbang_stop(&sp->bitbang);
 270 +err_no_bitbang:
 271 +       spi_master_put(sp->bitbang.master);
 272 +       gpio_free(pdata->pin_cs);
 273 +err_request_cs:
 274 +       gpio_free(pdata->pin_miso);
 275 +err_request_miso:
 276 +       gpio_free(pdata->pin_mosi);
 277 +err_request_mosi:
 278 +       gpio_free(pdata->pin_clk);
 279 +err_request_clk:
 280 +       kfree(master);
 281 +
 282 +err_alloc_master:
 283 +       return err;
 284 +}
 285 +
 286 +static int __devexit spi_gpio_remove(struct platform_device *pdev)
 287 +{
 288 +       struct spi_gpio *sp;
 289 +       struct spi_gpio_platform_data *pdata;
 290 +
 291 +       pdata = pdev->dev.platform_data;
 292 +       sp = platform_get_drvdata(pdev);
 293 +
 294 +       gpio_free(pdata->pin_clk);
 295 +       gpio_free(pdata->pin_mosi);
 296 +       gpio_free(pdata->pin_miso);
 297 +       gpio_free(pdata->pin_cs);
 298 +       spi_bitbang_stop(&sp->bitbang);
 299 +       spi_master_put(sp->bitbang.master);
 300 +
 301 +       return 0;
 302 +}
 303 +
 304 +static struct platform_driver spi_gpio_driver = {
 305 +       .driver         = {
 306 +               .name   = SPI_GPIO_PLATDEV_NAME,
 307 +               .owner  = THIS_MODULE,
 308 +       },
 309 +       .probe          = spi_gpio_probe,
 310 +       .remove         = __devexit_p(spi_gpio_remove),
 311 +};
 312 +
 313 +int spi_gpio_next_id(void)
 314 +{
 315 +       static atomic_t counter = ATOMIC_INIT(-1);
 316 +
 317 +       return atomic_inc_return(&counter);
 318 +}
 319 +EXPORT_SYMBOL(spi_gpio_next_id);
 320 +
 321 +static int __init spi_gpio_init(void)
 322 +{
 323 +       int err;
 324 +
 325 +       err = platform_driver_register(&spi_gpio_driver);
 326 +       if (err)
 327 +               printk(KERN_ERR "spi-gpio: register failed: %d\n", err);
 328 +
 329 +       return err;
 330 +}
 331 +module_init(spi_gpio_init);
 332 +
 333 +static void __exit spi_gpio_exit(void)
 334 +{
 335 +       platform_driver_unregister(&spi_gpio_driver);
 336 +}
 337 +module_exit(spi_gpio_exit);
 338 +
 339 +MODULE_AUTHOR("Piot Skamruk <piotr.skamruk at gmail.com>");
 340 +MODULE_AUTHOR("Michael Buesch");
 341 +MODULE_DESCRIPTION("Platform independent GPIO bitbanging SPI driver");
 342 +MODULE_LICENSE("GPL v2");
 343 Index: linux-2.6.28.2/drivers/spi/Kconfig
 344 ===================================================================
 345 --- linux-2.6.28.2.orig/drivers/spi/Kconfig     2009-02-10 17:13:57.000000000 +0100
 346 +++ linux-2.6.28.2/drivers/spi/Kconfig  2009-02-10 17:14:33.000000000 +0100
 347 @@ -100,6 +100,15 @@ config SPI_BUTTERFLY
 348           inexpensive battery powered microcontroller evaluation board.
 349           This same cable can be used to flash new firmware.
 350
 351 +config SPI_GPIO_OLD
 352 +       tristate "Old GPIO API based bitbanging SPI controller (DEPRECATED)"
 353 +       depends on SPI_MASTER && GENERIC_GPIO
 354 +       select SPI_BITBANG
 355 +       help
 356 +         This code is deprecated. Please use the new mainline SPI-GPIO driver.
 357 +
 358 +         If unsure, say N.
 359 +
 360  config SPI_IMX
 361         tristate "Freescale iMX SPI controller"
 362         depends on ARCH_IMX && EXPERIMENTAL
 363 Index: linux-2.6.28.2/drivers/spi/Makefile
 364 ===================================================================
 365 --- linux-2.6.28.2.orig/drivers/spi/Makefile    2009-02-10 17:13:57.000000000 +0100
 366 +++ linux-2.6.28.2/drivers/spi/Makefile 2009-02-10 17:14:33.000000000 +0100
 367 @@ -16,6 +16,7 @@ obj-$(CONFIG_SPI_BFIN)                        += spi_bfin5xx.
 368  obj-$(CONFIG_SPI_BITBANG)              += spi_bitbang.o
 369  obj-$(CONFIG_SPI_AU1550)               += au1550_spi.o
 370  obj-$(CONFIG_SPI_BUTTERFLY)            += spi_butterfly.o
 371 +obj-$(CONFIG_SPI_GPIO_OLD)             += spi_gpio_old.o
 372  obj-$(CONFIG_SPI_IMX)                  += spi_imx.o
 373  obj-$(CONFIG_SPI_LM70_LLP)             += spi_lm70llp.o
 374  obj-$(CONFIG_SPI_PXA2XX)               += pxa2xx_spi.o