linux/drivers/gpio/gpio-mpc5200.c
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   1/*
   2 * MPC52xx gpio driver
   3 *
   4 * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2
   8 * as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, write to the Free Software
  17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18 */
  19
  20#include <linux/of.h>
  21#include <linux/kernel.h>
  22#include <linux/slab.h>
  23#include <linux/of_gpio.h>
  24#include <linux/io.h>
  25#include <linux/of_platform.h>
  26#include <linux/module.h>
  27
  28#include <asm/gpio.h>
  29#include <asm/mpc52xx.h>
  30#include <sysdev/fsl_soc.h>
  31
  32static DEFINE_SPINLOCK(gpio_lock);
  33
  34struct mpc52xx_gpiochip {
  35        struct of_mm_gpio_chip mmchip;
  36        unsigned int shadow_dvo;
  37        unsigned int shadow_gpioe;
  38        unsigned int shadow_ddr;
  39};
  40
  41/*
  42 * GPIO LIB API implementation for wakeup GPIOs.
  43 *
  44 * There's a maximum of 8 wakeup GPIOs. Which of these are available
  45 * for use depends on your board setup.
  46 *
  47 * 0 -> GPIO_WKUP_7
  48 * 1 -> GPIO_WKUP_6
  49 * 2 -> PSC6_1
  50 * 3 -> PSC6_0
  51 * 4 -> ETH_17
  52 * 5 -> PSC3_9
  53 * 6 -> PSC2_4
  54 * 7 -> PSC1_4
  55 *
  56 */
  57static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio)
  58{
  59        struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
  60        struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
  61        unsigned int ret;
  62
  63        ret = (in_8(&regs->wkup_ival) >> (7 - gpio)) & 1;
  64
  65        pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret);
  66
  67        return ret;
  68}
  69
  70static inline void
  71__mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
  72{
  73        struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
  74        struct mpc52xx_gpiochip *chip = container_of(mm_gc,
  75                        struct mpc52xx_gpiochip, mmchip);
  76        struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
  77
  78        if (val)
  79                chip->shadow_dvo |= 1 << (7 - gpio);
  80        else
  81                chip->shadow_dvo &= ~(1 << (7 - gpio));
  82
  83        out_8(&regs->wkup_dvo, chip->shadow_dvo);
  84}
  85
  86static void
  87mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
  88{
  89        unsigned long flags;
  90
  91        spin_lock_irqsave(&gpio_lock, flags);
  92
  93        __mpc52xx_wkup_gpio_set(gc, gpio, val);
  94
  95        spin_unlock_irqrestore(&gpio_lock, flags);
  96
  97        pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
  98}
  99
 100static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
 101{
 102        struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 103        struct mpc52xx_gpiochip *chip = container_of(mm_gc,
 104                        struct mpc52xx_gpiochip, mmchip);
 105        struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
 106        unsigned long flags;
 107
 108        spin_lock_irqsave(&gpio_lock, flags);
 109
 110        /* set the direction */
 111        chip->shadow_ddr &= ~(1 << (7 - gpio));
 112        out_8(&regs->wkup_ddr, chip->shadow_ddr);
 113
 114        /* and enable the pin */
 115        chip->shadow_gpioe |= 1 << (7 - gpio);
 116        out_8(&regs->wkup_gpioe, chip->shadow_gpioe);
 117
 118        spin_unlock_irqrestore(&gpio_lock, flags);
 119
 120        return 0;
 121}
 122
 123static int
 124mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 125{
 126        struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 127        struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
 128        struct mpc52xx_gpiochip *chip = container_of(mm_gc,
 129                        struct mpc52xx_gpiochip, mmchip);
 130        unsigned long flags;
 131
 132        spin_lock_irqsave(&gpio_lock, flags);
 133
 134        __mpc52xx_wkup_gpio_set(gc, gpio, val);
 135
 136        /* Then set direction */
 137        chip->shadow_ddr |= 1 << (7 - gpio);
 138        out_8(&regs->wkup_ddr, chip->shadow_ddr);
 139
 140        /* Finally enable the pin */
 141        chip->shadow_gpioe |= 1 << (7 - gpio);
 142        out_8(&regs->wkup_gpioe, chip->shadow_gpioe);
 143
 144        spin_unlock_irqrestore(&gpio_lock, flags);
 145
 146        pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
 147
 148        return 0;
 149}
 150
 151static int mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev)
 152{
 153        struct mpc52xx_gpiochip *chip;
 154        struct mpc52xx_gpio_wkup __iomem *regs;
 155        struct gpio_chip *gc;
 156        int ret;
 157
 158        chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 159        if (!chip)
 160                return -ENOMEM;
 161
 162        gc = &chip->mmchip.gc;
 163
 164        gc->ngpio            = 8;
 165        gc->direction_input  = mpc52xx_wkup_gpio_dir_in;
 166        gc->direction_output = mpc52xx_wkup_gpio_dir_out;
 167        gc->get              = mpc52xx_wkup_gpio_get;
 168        gc->set              = mpc52xx_wkup_gpio_set;
 169
 170        ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
 171        if (ret)
 172                return ret;
 173
 174        regs = chip->mmchip.regs;
 175        chip->shadow_gpioe = in_8(&regs->wkup_gpioe);
 176        chip->shadow_ddr = in_8(&regs->wkup_ddr);
 177        chip->shadow_dvo = in_8(&regs->wkup_dvo);
 178
 179        return 0;
 180}
 181
 182static int mpc52xx_gpiochip_remove(struct platform_device *ofdev)
 183{
 184        return -EBUSY;
 185}
 186
 187static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
 188        { .compatible = "fsl,mpc5200-gpio-wkup", },
 189        {}
 190};
 191
 192static struct platform_driver mpc52xx_wkup_gpiochip_driver = {
 193        .driver = {
 194                .name = "mpc5200-gpio-wkup",
 195                .owner = THIS_MODULE,
 196                .of_match_table = mpc52xx_wkup_gpiochip_match,
 197        },
 198        .probe = mpc52xx_wkup_gpiochip_probe,
 199        .remove = mpc52xx_gpiochip_remove,
 200};
 201
 202/*
 203 * GPIO LIB API implementation for simple GPIOs
 204 *
 205 * There's a maximum of 32 simple GPIOs. Which of these are available
 206 * for use depends on your board setup.
 207 * The numbering reflects the bit numbering in the port registers:
 208 *
 209 *  0..1  > reserved
 210 *  2..3  > IRDA
 211 *  4..7  > ETHR
 212 *  8..11 > reserved
 213 * 12..15 > USB
 214 * 16..17 > reserved
 215 * 18..23 > PSC3
 216 * 24..27 > PSC2
 217 * 28..31 > PSC1
 218 */
 219static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio)
 220{
 221        struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 222        struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
 223        unsigned int ret;
 224
 225        ret = (in_be32(&regs->simple_ival) >> (31 - gpio)) & 1;
 226
 227        return ret;
 228}
 229
 230static inline void
 231__mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 232{
 233        struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 234        struct mpc52xx_gpiochip *chip = container_of(mm_gc,
 235                        struct mpc52xx_gpiochip, mmchip);
 236        struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
 237
 238        if (val)
 239                chip->shadow_dvo |= 1 << (31 - gpio);
 240        else
 241                chip->shadow_dvo &= ~(1 << (31 - gpio));
 242        out_be32(&regs->simple_dvo, chip->shadow_dvo);
 243}
 244
 245static void
 246mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 247{
 248        unsigned long flags;
 249
 250        spin_lock_irqsave(&gpio_lock, flags);
 251
 252        __mpc52xx_simple_gpio_set(gc, gpio, val);
 253
 254        spin_unlock_irqrestore(&gpio_lock, flags);
 255
 256        pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
 257}
 258
 259static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
 260{
 261        struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 262        struct mpc52xx_gpiochip *chip = container_of(mm_gc,
 263                        struct mpc52xx_gpiochip, mmchip);
 264        struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
 265        unsigned long flags;
 266
 267        spin_lock_irqsave(&gpio_lock, flags);
 268
 269        /* set the direction */
 270        chip->shadow_ddr &= ~(1 << (31 - gpio));
 271        out_be32(&regs->simple_ddr, chip->shadow_ddr);
 272
 273        /* and enable the pin */
 274        chip->shadow_gpioe |= 1 << (31 - gpio);
 275        out_be32(&regs->simple_gpioe, chip->shadow_gpioe);
 276
 277        spin_unlock_irqrestore(&gpio_lock, flags);
 278
 279        return 0;
 280}
 281
 282static int
 283mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 284{
 285        struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 286        struct mpc52xx_gpiochip *chip = container_of(mm_gc,
 287                        struct mpc52xx_gpiochip, mmchip);
 288        struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
 289        unsigned long flags;
 290
 291        spin_lock_irqsave(&gpio_lock, flags);
 292
 293        /* First set initial value */
 294        __mpc52xx_simple_gpio_set(gc, gpio, val);
 295
 296        /* Then set direction */
 297        chip->shadow_ddr |= 1 << (31 - gpio);
 298        out_be32(&regs->simple_ddr, chip->shadow_ddr);
 299
 300        /* Finally enable the pin */
 301        chip->shadow_gpioe |= 1 << (31 - gpio);
 302        out_be32(&regs->simple_gpioe, chip->shadow_gpioe);
 303
 304        spin_unlock_irqrestore(&gpio_lock, flags);
 305
 306        pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
 307
 308        return 0;
 309}
 310
 311static int mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev)
 312{
 313        struct mpc52xx_gpiochip *chip;
 314        struct gpio_chip *gc;
 315        struct mpc52xx_gpio __iomem *regs;
 316        int ret;
 317
 318        chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 319        if (!chip)
 320                return -ENOMEM;
 321
 322        gc = &chip->mmchip.gc;
 323
 324        gc->ngpio            = 32;
 325        gc->direction_input  = mpc52xx_simple_gpio_dir_in;
 326        gc->direction_output = mpc52xx_simple_gpio_dir_out;
 327        gc->get              = mpc52xx_simple_gpio_get;
 328        gc->set              = mpc52xx_simple_gpio_set;
 329
 330        ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
 331        if (ret)
 332                return ret;
 333
 334        regs = chip->mmchip.regs;
 335        chip->shadow_gpioe = in_be32(&regs->simple_gpioe);
 336        chip->shadow_ddr = in_be32(&regs->simple_ddr);
 337        chip->shadow_dvo = in_be32(&regs->simple_dvo);
 338
 339        return 0;
 340}
 341
 342static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
 343        { .compatible = "fsl,mpc5200-gpio", },
 344        {}
 345};
 346
 347static struct platform_driver mpc52xx_simple_gpiochip_driver = {
 348        .driver = {
 349                .name = "mpc5200-gpio",
 350                .owner = THIS_MODULE,
 351                .of_match_table = mpc52xx_simple_gpiochip_match,
 352        },
 353        .probe = mpc52xx_simple_gpiochip_probe,
 354        .remove = mpc52xx_gpiochip_remove,
 355};
 356
 357static int __init mpc52xx_gpio_init(void)
 358{
 359        if (platform_driver_register(&mpc52xx_wkup_gpiochip_driver))
 360                printk(KERN_ERR "Unable to register wakeup GPIO driver\n");
 361
 362        if (platform_driver_register(&mpc52xx_simple_gpiochip_driver))
 363                printk(KERN_ERR "Unable to register simple GPIO driver\n");
 364
 365        return 0;
 366}
 367
 368
 369/* Make sure we get initialised before anyone else tries to use us */
 370subsys_initcall(mpc52xx_gpio_init);
 371
 372/* No exit call at the moment as we cannot unregister of gpio chips */
 373
 374MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
 375MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
 376MODULE_LICENSE("GPL v2");
 377
 378
Hosted by Missing Link Electronics. The original LXR software by the LXR community, this experimental version by lxr@linux.no.