1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * MPC52xx gpio driver 4 * 5 * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix 6 */ 7 8 #include <linux/of.h> 9 #include <linux/kernel.h> 10 #include <linux/slab.h> 11 #include <linux/gpio/legacy-of-mm-gpiochip.h> 12 #include <linux/io.h> 13 #include <linux/platform_device.h> 14 #include <linux/module.h> 15 16 #include <asm/mpc52xx.h> 17 #include <sysdev/fsl_soc.h> 18 19 static DEFINE_SPINLOCK(gpio_lock); 20 21 struct mpc52xx_gpiochip { 22 struct of_mm_gpio_chip mmchip; 23 unsigned int shadow_dvo; 24 unsigned int shadow_gpioe; 25 unsigned int shadow_ddr; 26 }; 27 28 /* 29 * GPIO LIB API implementation for wakeup GPIOs. 30 * 31 * There's a maximum of 8 wakeup GPIOs. Which of these are available 32 * for use depends on your board setup. 33 * 34 * 0 -> GPIO_WKUP_7 35 * 1 -> GPIO_WKUP_6 36 * 2 -> PSC6_1 37 * 3 -> PSC6_0 38 * 4 -> ETH_17 39 * 5 -> PSC3_9 40 * 6 -> PSC2_4 41 * 7 -> PSC1_4 42 * 43 */ 44 static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio) 45 { 46 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 47 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; 48 unsigned int ret; 49 50 ret = (in_8(®s->wkup_ival) >> (7 - gpio)) & 1; 51 52 pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret); 53 54 return ret; 55 } 56 57 static inline void 58 __mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) 59 { 60 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 61 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); 62 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; 63 64 if (val) 65 chip->shadow_dvo |= 1 << (7 - gpio); 66 else 67 chip->shadow_dvo &= ~(1 << (7 - gpio)); 68 69 out_8(®s->wkup_dvo, chip->shadow_dvo); 70 } 71 72 static void 73 mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) 74 { 75 unsigned long flags; 76 77 spin_lock_irqsave(&gpio_lock, flags); 78 79 __mpc52xx_wkup_gpio_set(gc, gpio, val); 80 81 spin_unlock_irqrestore(&gpio_lock, flags); 82 83 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); 84 } 85 86 static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio) 87 { 88 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 89 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); 90 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; 91 unsigned long flags; 92 93 spin_lock_irqsave(&gpio_lock, flags); 94 95 /* set the direction */ 96 chip->shadow_ddr &= ~(1 << (7 - gpio)); 97 out_8(®s->wkup_ddr, chip->shadow_ddr); 98 99 /* and enable the pin */ 100 chip->shadow_gpioe |= 1 << (7 - gpio); 101 out_8(®s->wkup_gpioe, chip->shadow_gpioe); 102 103 spin_unlock_irqrestore(&gpio_lock, flags); 104 105 return 0; 106 } 107 108 static int 109 mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) 110 { 111 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 112 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; 113 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); 114 unsigned long flags; 115 116 spin_lock_irqsave(&gpio_lock, flags); 117 118 __mpc52xx_wkup_gpio_set(gc, gpio, val); 119 120 /* Then set direction */ 121 chip->shadow_ddr |= 1 << (7 - gpio); 122 out_8(®s->wkup_ddr, chip->shadow_ddr); 123 124 /* Finally enable the pin */ 125 chip->shadow_gpioe |= 1 << (7 - gpio); 126 out_8(®s->wkup_gpioe, chip->shadow_gpioe); 127 128 spin_unlock_irqrestore(&gpio_lock, flags); 129 130 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); 131 132 return 0; 133 } 134 135 static int mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev) 136 { 137 struct mpc52xx_gpiochip *chip; 138 struct mpc52xx_gpio_wkup __iomem *regs; 139 struct gpio_chip *gc; 140 int ret; 141 142 chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL); 143 if (!chip) 144 return -ENOMEM; 145 146 platform_set_drvdata(ofdev, chip); 147 148 gc = &chip->mmchip.gc; 149 150 gc->ngpio = 8; 151 gc->direction_input = mpc52xx_wkup_gpio_dir_in; 152 gc->direction_output = mpc52xx_wkup_gpio_dir_out; 153 gc->get = mpc52xx_wkup_gpio_get; 154 gc->set = mpc52xx_wkup_gpio_set; 155 156 ret = of_mm_gpiochip_add_data(ofdev->dev.of_node, &chip->mmchip, chip); 157 if (ret) 158 return ret; 159 160 regs = chip->mmchip.regs; 161 chip->shadow_gpioe = in_8(®s->wkup_gpioe); 162 chip->shadow_ddr = in_8(®s->wkup_ddr); 163 chip->shadow_dvo = in_8(®s->wkup_dvo); 164 165 return 0; 166 } 167 168 static void mpc52xx_gpiochip_remove(struct platform_device *ofdev) 169 { 170 struct mpc52xx_gpiochip *chip = platform_get_drvdata(ofdev); 171 172 of_mm_gpiochip_remove(&chip->mmchip); 173 } 174 175 static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = { 176 { .compatible = "fsl,mpc5200-gpio-wkup", }, 177 {} 178 }; 179 180 static struct platform_driver mpc52xx_wkup_gpiochip_driver = { 181 .driver = { 182 .name = "mpc5200-gpio-wkup", 183 .of_match_table = mpc52xx_wkup_gpiochip_match, 184 }, 185 .probe = mpc52xx_wkup_gpiochip_probe, 186 .remove_new = mpc52xx_gpiochip_remove, 187 }; 188 189 /* 190 * GPIO LIB API implementation for simple GPIOs 191 * 192 * There's a maximum of 32 simple GPIOs. Which of these are available 193 * for use depends on your board setup. 194 * The numbering reflects the bit numbering in the port registers: 195 * 196 * 0..1 > reserved 197 * 2..3 > IRDA 198 * 4..7 > ETHR 199 * 8..11 > reserved 200 * 12..15 > USB 201 * 16..17 > reserved 202 * 18..23 > PSC3 203 * 24..27 > PSC2 204 * 28..31 > PSC1 205 */ 206 static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio) 207 { 208 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 209 struct mpc52xx_gpio __iomem *regs = mm_gc->regs; 210 unsigned int ret; 211 212 ret = (in_be32(®s->simple_ival) >> (31 - gpio)) & 1; 213 214 return ret; 215 } 216 217 static inline void 218 __mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) 219 { 220 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 221 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); 222 struct mpc52xx_gpio __iomem *regs = mm_gc->regs; 223 224 if (val) 225 chip->shadow_dvo |= 1 << (31 - gpio); 226 else 227 chip->shadow_dvo &= ~(1 << (31 - gpio)); 228 out_be32(®s->simple_dvo, chip->shadow_dvo); 229 } 230 231 static void 232 mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) 233 { 234 unsigned long flags; 235 236 spin_lock_irqsave(&gpio_lock, flags); 237 238 __mpc52xx_simple_gpio_set(gc, gpio, val); 239 240 spin_unlock_irqrestore(&gpio_lock, flags); 241 242 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); 243 } 244 245 static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio) 246 { 247 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 248 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); 249 struct mpc52xx_gpio __iomem *regs = mm_gc->regs; 250 unsigned long flags; 251 252 spin_lock_irqsave(&gpio_lock, flags); 253 254 /* set the direction */ 255 chip->shadow_ddr &= ~(1 << (31 - gpio)); 256 out_be32(®s->simple_ddr, chip->shadow_ddr); 257 258 /* and enable the pin */ 259 chip->shadow_gpioe |= 1 << (31 - gpio); 260 out_be32(®s->simple_gpioe, chip->shadow_gpioe); 261 262 spin_unlock_irqrestore(&gpio_lock, flags); 263 264 return 0; 265 } 266 267 static int 268 mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) 269 { 270 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); 271 struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); 272 struct mpc52xx_gpio __iomem *regs = mm_gc->regs; 273 unsigned long flags; 274 275 spin_lock_irqsave(&gpio_lock, flags); 276 277 /* First set initial value */ 278 __mpc52xx_simple_gpio_set(gc, gpio, val); 279 280 /* Then set direction */ 281 chip->shadow_ddr |= 1 << (31 - gpio); 282 out_be32(®s->simple_ddr, chip->shadow_ddr); 283 284 /* Finally enable the pin */ 285 chip->shadow_gpioe |= 1 << (31 - gpio); 286 out_be32(®s->simple_gpioe, chip->shadow_gpioe); 287 288 spin_unlock_irqrestore(&gpio_lock, flags); 289 290 pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); 291 292 return 0; 293 } 294 295 static int mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev) 296 { 297 struct mpc52xx_gpiochip *chip; 298 struct gpio_chip *gc; 299 struct mpc52xx_gpio __iomem *regs; 300 int ret; 301 302 chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL); 303 if (!chip) 304 return -ENOMEM; 305 306 platform_set_drvdata(ofdev, chip); 307 308 gc = &chip->mmchip.gc; 309 310 gc->ngpio = 32; 311 gc->direction_input = mpc52xx_simple_gpio_dir_in; 312 gc->direction_output = mpc52xx_simple_gpio_dir_out; 313 gc->get = mpc52xx_simple_gpio_get; 314 gc->set = mpc52xx_simple_gpio_set; 315 316 ret = of_mm_gpiochip_add_data(ofdev->dev.of_node, &chip->mmchip, chip); 317 if (ret) 318 return ret; 319 320 regs = chip->mmchip.regs; 321 chip->shadow_gpioe = in_be32(®s->simple_gpioe); 322 chip->shadow_ddr = in_be32(®s->simple_ddr); 323 chip->shadow_dvo = in_be32(®s->simple_dvo); 324 325 return 0; 326 } 327 328 static const struct of_device_id mpc52xx_simple_gpiochip_match[] = { 329 { .compatible = "fsl,mpc5200-gpio", }, 330 {} 331 }; 332 333 static struct platform_driver mpc52xx_simple_gpiochip_driver = { 334 .driver = { 335 .name = "mpc5200-gpio", 336 .of_match_table = mpc52xx_simple_gpiochip_match, 337 }, 338 .probe = mpc52xx_simple_gpiochip_probe, 339 .remove_new = mpc52xx_gpiochip_remove, 340 }; 341 342 static struct platform_driver * const drivers[] = { 343 &mpc52xx_wkup_gpiochip_driver, 344 &mpc52xx_simple_gpiochip_driver, 345 }; 346 347 static int __init mpc52xx_gpio_init(void) 348 { 349 return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); 350 } 351 352 /* Make sure we get initialised before anyone else tries to use us */ 353 subsys_initcall(mpc52xx_gpio_init); 354 355 static void __exit mpc52xx_gpio_exit(void) 356 { 357 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); 358 } 359 module_exit(mpc52xx_gpio_exit); 360 361 MODULE_DESCRIPTION("Freescale MPC52xx gpio driver"); 362 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de"); 363 MODULE_LICENSE("GPL v2"); 364 365