s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 22 | #include <linux/slab.h> |
s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 23 | #include <linux/of_gpio.h> |
| 24 | #include <linux/io.h> |
| 25 | #include <linux/of_platform.h> |
| 26 | |
| 27 | #include <asm/gpio.h> |
| 28 | #include <asm/mpc52xx.h> |
| 29 | #include <sysdev/fsl_soc.h> |
| 30 | |
| 31 | static DEFINE_SPINLOCK(gpio_lock); |
| 32 | |
| 33 | struct mpc52xx_gpiochip { |
| 34 | struct of_mm_gpio_chip mmchip; |
| 35 | unsigned int shadow_dvo; |
| 36 | unsigned int shadow_gpioe; |
| 37 | unsigned int shadow_ddr; |
| 38 | }; |
| 39 | |
| 40 | /* |
| 41 | * GPIO LIB API implementation for wakeup GPIOs. |
| 42 | * |
| 43 | * There's a maximum of 8 wakeup GPIOs. Which of these are available |
| 44 | * for use depends on your board setup. |
| 45 | * |
| 46 | * 0 -> GPIO_WKUP_7 |
| 47 | * 1 -> GPIO_WKUP_6 |
| 48 | * 2 -> PSC6_1 |
| 49 | * 3 -> PSC6_0 |
| 50 | * 4 -> ETH_17 |
| 51 | * 5 -> PSC3_9 |
| 52 | * 6 -> PSC2_4 |
| 53 | * 7 -> PSC1_4 |
| 54 | * |
| 55 | */ |
| 56 | static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio) |
| 57 | { |
| 58 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); |
| 59 | struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; |
| 60 | unsigned int ret; |
| 61 | |
| 62 | ret = (in_8(®s->wkup_ival) >> (7 - gpio)) & 1; |
| 63 | |
| 64 | pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret); |
| 65 | |
| 66 | return ret; |
| 67 | } |
| 68 | |
| 69 | static inline void |
| 70 | __mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) |
| 71 | { |
| 72 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); |
| 73 | struct mpc52xx_gpiochip *chip = container_of(mm_gc, |
| 74 | struct mpc52xx_gpiochip, mmchip); |
| 75 | struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; |
| 76 | |
| 77 | if (val) |
| 78 | chip->shadow_dvo |= 1 << (7 - gpio); |
| 79 | else |
| 80 | chip->shadow_dvo &= ~(1 << (7 - gpio)); |
| 81 | |
| 82 | out_8(®s->wkup_dvo, chip->shadow_dvo); |
| 83 | } |
| 84 | |
| 85 | static void |
| 86 | mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) |
| 87 | { |
| 88 | unsigned long flags; |
| 89 | |
| 90 | spin_lock_irqsave(&gpio_lock, flags); |
| 91 | |
| 92 | __mpc52xx_wkup_gpio_set(gc, gpio, val); |
| 93 | |
| 94 | spin_unlock_irqrestore(&gpio_lock, flags); |
| 95 | |
| 96 | pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); |
| 97 | } |
| 98 | |
| 99 | static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio) |
| 100 | { |
| 101 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); |
| 102 | struct mpc52xx_gpiochip *chip = container_of(mm_gc, |
| 103 | struct mpc52xx_gpiochip, mmchip); |
Al Viro | 9307245 | 2008-06-02 10:59:02 +0100 | [diff] [blame] | 104 | struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; |
s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 105 | unsigned long flags; |
| 106 | |
| 107 | spin_lock_irqsave(&gpio_lock, flags); |
| 108 | |
| 109 | /* set the direction */ |
| 110 | chip->shadow_ddr &= ~(1 << (7 - gpio)); |
| 111 | out_8(®s->wkup_ddr, chip->shadow_ddr); |
| 112 | |
| 113 | /* and enable the pin */ |
| 114 | chip->shadow_gpioe |= 1 << (7 - gpio); |
| 115 | out_8(®s->wkup_gpioe, chip->shadow_gpioe); |
| 116 | |
| 117 | spin_unlock_irqrestore(&gpio_lock, flags); |
| 118 | |
| 119 | return 0; |
| 120 | } |
| 121 | |
| 122 | static int |
| 123 | mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) |
| 124 | { |
| 125 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); |
Al Viro | 9307245 | 2008-06-02 10:59:02 +0100 | [diff] [blame] | 126 | struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; |
s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 127 | struct mpc52xx_gpiochip *chip = container_of(mm_gc, |
| 128 | struct mpc52xx_gpiochip, mmchip); |
| 129 | unsigned long flags; |
| 130 | |
| 131 | spin_lock_irqsave(&gpio_lock, flags); |
| 132 | |
| 133 | __mpc52xx_wkup_gpio_set(gc, gpio, val); |
| 134 | |
| 135 | /* Then set direction */ |
| 136 | chip->shadow_ddr |= 1 << (7 - gpio); |
| 137 | out_8(®s->wkup_ddr, chip->shadow_ddr); |
| 138 | |
| 139 | /* Finally enable the pin */ |
| 140 | chip->shadow_gpioe |= 1 << (7 - gpio); |
| 141 | out_8(®s->wkup_gpioe, chip->shadow_gpioe); |
| 142 | |
| 143 | spin_unlock_irqrestore(&gpio_lock, flags); |
| 144 | |
| 145 | pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); |
| 146 | |
| 147 | return 0; |
| 148 | } |
| 149 | |
Grant Likely | 0000612 | 2011-02-22 19:59:54 -0700 | [diff] [blame^] | 150 | static int __devinit mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev) |
s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 151 | { |
| 152 | struct mpc52xx_gpiochip *chip; |
Al Viro | 9307245 | 2008-06-02 10:59:02 +0100 | [diff] [blame] | 153 | struct mpc52xx_gpio_wkup __iomem *regs; |
Anton Vorontsov | a19e3da | 2010-06-08 07:48:16 -0600 | [diff] [blame] | 154 | struct gpio_chip *gc; |
s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 155 | int ret; |
| 156 | |
| 157 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); |
| 158 | if (!chip) |
| 159 | return -ENOMEM; |
| 160 | |
Anton Vorontsov | a19e3da | 2010-06-08 07:48:16 -0600 | [diff] [blame] | 161 | gc = &chip->mmchip.gc; |
s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 162 | |
Anton Vorontsov | a19e3da | 2010-06-08 07:48:16 -0600 | [diff] [blame] | 163 | gc->ngpio = 8; |
| 164 | gc->direction_input = mpc52xx_wkup_gpio_dir_in; |
| 165 | gc->direction_output = mpc52xx_wkup_gpio_dir_out; |
| 166 | gc->get = mpc52xx_wkup_gpio_get; |
| 167 | gc->set = mpc52xx_wkup_gpio_set; |
s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 168 | |
Grant Likely | 61c7a08 | 2010-04-13 16:12:29 -0700 | [diff] [blame] | 169 | ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip); |
s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 170 | if (ret) |
| 171 | return ret; |
| 172 | |
| 173 | regs = chip->mmchip.regs; |
| 174 | chip->shadow_gpioe = in_8(®s->wkup_gpioe); |
| 175 | chip->shadow_ddr = in_8(®s->wkup_ddr); |
| 176 | chip->shadow_dvo = in_8(®s->wkup_dvo); |
| 177 | |
| 178 | return 0; |
| 179 | } |
| 180 | |
Grant Likely | a454dc5 | 2010-07-22 15:52:34 -0600 | [diff] [blame] | 181 | static int mpc52xx_gpiochip_remove(struct platform_device *ofdev) |
s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 182 | { |
| 183 | return -EBUSY; |
| 184 | } |
| 185 | |
| 186 | static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = { |
| 187 | { |
| 188 | .compatible = "fsl,mpc5200-gpio-wkup", |
| 189 | }, |
| 190 | {} |
| 191 | }; |
| 192 | |
Grant Likely | 0000612 | 2011-02-22 19:59:54 -0700 | [diff] [blame^] | 193 | static struct platform_driver mpc52xx_wkup_gpiochip_driver = { |
Grant Likely | 4018294 | 2010-04-13 16:13:02 -0700 | [diff] [blame] | 194 | .driver = { |
| 195 | .name = "gpio_wkup", |
| 196 | .owner = THIS_MODULE, |
| 197 | .of_match_table = mpc52xx_wkup_gpiochip_match, |
| 198 | }, |
s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 199 | .probe = mpc52xx_wkup_gpiochip_probe, |
| 200 | .remove = mpc52xx_gpiochip_remove, |
| 201 | }; |
| 202 | |
| 203 | /* |
| 204 | * GPIO LIB API implementation for simple GPIOs |
| 205 | * |
| 206 | * There's a maximum of 32 simple GPIOs. Which of these are available |
| 207 | * for use depends on your board setup. |
| 208 | * The numbering reflects the bit numbering in the port registers: |
| 209 | * |
| 210 | * 0..1 > reserved |
| 211 | * 2..3 > IRDA |
| 212 | * 4..7 > ETHR |
| 213 | * 8..11 > reserved |
| 214 | * 12..15 > USB |
| 215 | * 16..17 > reserved |
| 216 | * 18..23 > PSC3 |
| 217 | * 24..27 > PSC2 |
| 218 | * 28..31 > PSC1 |
| 219 | */ |
| 220 | static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio) |
| 221 | { |
| 222 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); |
| 223 | struct mpc52xx_gpio __iomem *regs = mm_gc->regs; |
| 224 | unsigned int ret; |
| 225 | |
| 226 | ret = (in_be32(®s->simple_ival) >> (31 - gpio)) & 1; |
| 227 | |
| 228 | return ret; |
| 229 | } |
| 230 | |
| 231 | static inline void |
| 232 | __mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) |
| 233 | { |
| 234 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); |
| 235 | struct mpc52xx_gpiochip *chip = container_of(mm_gc, |
| 236 | struct mpc52xx_gpiochip, mmchip); |
| 237 | struct mpc52xx_gpio __iomem *regs = mm_gc->regs; |
| 238 | |
| 239 | if (val) |
| 240 | chip->shadow_dvo |= 1 << (31 - gpio); |
| 241 | else |
| 242 | chip->shadow_dvo &= ~(1 << (31 - gpio)); |
| 243 | out_be32(®s->simple_dvo, chip->shadow_dvo); |
| 244 | } |
| 245 | |
| 246 | static void |
| 247 | mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) |
| 248 | { |
| 249 | unsigned long flags; |
| 250 | |
| 251 | spin_lock_irqsave(&gpio_lock, flags); |
| 252 | |
| 253 | __mpc52xx_simple_gpio_set(gc, gpio, val); |
| 254 | |
| 255 | spin_unlock_irqrestore(&gpio_lock, flags); |
| 256 | |
| 257 | pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); |
| 258 | } |
| 259 | |
| 260 | static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio) |
| 261 | { |
| 262 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); |
| 263 | struct mpc52xx_gpiochip *chip = container_of(mm_gc, |
| 264 | struct mpc52xx_gpiochip, mmchip); |
Al Viro | 9307245 | 2008-06-02 10:59:02 +0100 | [diff] [blame] | 265 | struct mpc52xx_gpio __iomem *regs = mm_gc->regs; |
s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 266 | unsigned long flags; |
| 267 | |
| 268 | spin_lock_irqsave(&gpio_lock, flags); |
| 269 | |
| 270 | /* set the direction */ |
| 271 | chip->shadow_ddr &= ~(1 << (31 - gpio)); |
| 272 | out_be32(®s->simple_ddr, chip->shadow_ddr); |
| 273 | |
| 274 | /* and enable the pin */ |
| 275 | chip->shadow_gpioe |= 1 << (31 - gpio); |
| 276 | out_be32(®s->simple_gpioe, chip->shadow_gpioe); |
| 277 | |
| 278 | spin_unlock_irqrestore(&gpio_lock, flags); |
| 279 | |
| 280 | return 0; |
| 281 | } |
| 282 | |
| 283 | static int |
| 284 | mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) |
| 285 | { |
| 286 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); |
| 287 | struct mpc52xx_gpiochip *chip = container_of(mm_gc, |
| 288 | struct mpc52xx_gpiochip, mmchip); |
Al Viro | 9307245 | 2008-06-02 10:59:02 +0100 | [diff] [blame] | 289 | struct mpc52xx_gpio __iomem *regs = mm_gc->regs; |
s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 290 | unsigned long flags; |
| 291 | |
| 292 | spin_lock_irqsave(&gpio_lock, flags); |
| 293 | |
| 294 | /* First set initial value */ |
| 295 | __mpc52xx_simple_gpio_set(gc, gpio, val); |
| 296 | |
| 297 | /* Then set direction */ |
| 298 | chip->shadow_ddr |= 1 << (31 - gpio); |
| 299 | out_be32(®s->simple_ddr, chip->shadow_ddr); |
| 300 | |
| 301 | /* Finally enable the pin */ |
| 302 | chip->shadow_gpioe |= 1 << (31 - gpio); |
| 303 | out_be32(®s->simple_gpioe, chip->shadow_gpioe); |
| 304 | |
| 305 | spin_unlock_irqrestore(&gpio_lock, flags); |
| 306 | |
| 307 | pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); |
| 308 | |
| 309 | return 0; |
| 310 | } |
| 311 | |
Grant Likely | 0000612 | 2011-02-22 19:59:54 -0700 | [diff] [blame^] | 312 | static int __devinit mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev) |
s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 313 | { |
| 314 | struct mpc52xx_gpiochip *chip; |
Anton Vorontsov | a19e3da | 2010-06-08 07:48:16 -0600 | [diff] [blame] | 315 | struct gpio_chip *gc; |
Al Viro | 9307245 | 2008-06-02 10:59:02 +0100 | [diff] [blame] | 316 | struct mpc52xx_gpio __iomem *regs; |
s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 317 | int ret; |
| 318 | |
| 319 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); |
| 320 | if (!chip) |
| 321 | return -ENOMEM; |
| 322 | |
Anton Vorontsov | a19e3da | 2010-06-08 07:48:16 -0600 | [diff] [blame] | 323 | gc = &chip->mmchip.gc; |
s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 324 | |
Anton Vorontsov | a19e3da | 2010-06-08 07:48:16 -0600 | [diff] [blame] | 325 | gc->ngpio = 32; |
| 326 | gc->direction_input = mpc52xx_simple_gpio_dir_in; |
| 327 | gc->direction_output = mpc52xx_simple_gpio_dir_out; |
| 328 | gc->get = mpc52xx_simple_gpio_get; |
| 329 | gc->set = mpc52xx_simple_gpio_set; |
s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 330 | |
Grant Likely | 61c7a08 | 2010-04-13 16:12:29 -0700 | [diff] [blame] | 331 | ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip); |
s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 332 | if (ret) |
| 333 | return ret; |
| 334 | |
| 335 | regs = chip->mmchip.regs; |
| 336 | chip->shadow_gpioe = in_be32(®s->simple_gpioe); |
| 337 | chip->shadow_ddr = in_be32(®s->simple_ddr); |
| 338 | chip->shadow_dvo = in_be32(®s->simple_dvo); |
| 339 | |
| 340 | return 0; |
| 341 | } |
| 342 | |
| 343 | static const struct of_device_id mpc52xx_simple_gpiochip_match[] = { |
| 344 | { |
| 345 | .compatible = "fsl,mpc5200-gpio", |
| 346 | }, |
| 347 | {} |
| 348 | }; |
| 349 | |
Grant Likely | 0000612 | 2011-02-22 19:59:54 -0700 | [diff] [blame^] | 350 | static struct platform_driver mpc52xx_simple_gpiochip_driver = { |
Grant Likely | 4018294 | 2010-04-13 16:13:02 -0700 | [diff] [blame] | 351 | .driver = { |
| 352 | .name = "gpio", |
| 353 | .owner = THIS_MODULE, |
| 354 | .of_match_table = mpc52xx_simple_gpiochip_match, |
| 355 | }, |
s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 356 | .probe = mpc52xx_simple_gpiochip_probe, |
| 357 | .remove = mpc52xx_gpiochip_remove, |
| 358 | }; |
| 359 | |
s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 360 | static int __init mpc52xx_gpio_init(void) |
| 361 | { |
Grant Likely | 0000612 | 2011-02-22 19:59:54 -0700 | [diff] [blame^] | 362 | if (platform_driver_register(&mpc52xx_wkup_gpiochip_driver)) |
s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 363 | printk(KERN_ERR "Unable to register wakeup GPIO driver\n"); |
| 364 | |
Grant Likely | 0000612 | 2011-02-22 19:59:54 -0700 | [diff] [blame^] | 365 | if (platform_driver_register(&mpc52xx_simple_gpiochip_driver)) |
s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 366 | printk(KERN_ERR "Unable to register simple GPIO driver\n"); |
| 367 | |
s.hauer@pengutronix.de | 3cd2550c | 2008-04-25 20:56:04 +1000 | [diff] [blame] | 368 | return 0; |
| 369 | } |
| 370 | |
| 371 | |
| 372 | /* Make sure we get initialised before anyone else tries to use us */ |
| 373 | subsys_initcall(mpc52xx_gpio_init); |
| 374 | |
| 375 | /* No exit call at the moment as we cannot unregister of gpio chips */ |
| 376 | |
| 377 | MODULE_DESCRIPTION("Freescale MPC52xx gpio driver"); |
| 378 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de"); |
| 379 | MODULE_LICENSE("GPL v2"); |
| 380 | |