arch/mips/ar7/gpio.c

   1 /*
   2  * Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
   3  * Copyright (C) 2007 Eugene Konev <ejka@openwrt.org>
   4  * Copyright (C) 2009-2010 Florian Fainelli <florian@openwrt.org>
   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 as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/gpio.h>
  23
  24 #include <asm/mach-ar7/gpio.h>
  25
  26 struct ar7_gpio_chip {
  27         void __iomem            *regs;
  28         struct gpio_chip        chip;
  29 };
  30
  31 static int ar7_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
  32 {
  33         struct ar7_gpio_chip *gpch =
  34                                 container_of(chip, struct ar7_gpio_chip, chip);
  35         void __iomem *gpio_in = gpch->regs + AR7_GPIO_INPUT;
  36
  37         return readl(gpio_in) & (1 << gpio);
  38 }
  39
  40 static int titan_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
  41 {
  42         struct ar7_gpio_chip *gpch =
  43                                 container_of(chip, struct ar7_gpio_chip, chip);
  44         void __iomem *gpio_in0 = gpch->regs + TITAN_GPIO_INPUT_0;
  45         void __iomem *gpio_in1 = gpch->regs + TITAN_GPIO_INPUT_1;
  46
  47         return readl(gpio >> 5 ? gpio_in1 : gpio_in0) & (1 << (gpio & 0x1f));
  48 }
  49
  50 static void ar7_gpio_set_value(struct gpio_chip *chip,
  51                                 unsigned gpio, int value)
  52 {
  53         struct ar7_gpio_chip *gpch =
  54                                 container_of(chip, struct ar7_gpio_chip, chip);
  55         void __iomem *gpio_out = gpch->regs + AR7_GPIO_OUTPUT;
  56         unsigned tmp;
  57
  58         tmp = readl(gpio_out) & ~(1 << gpio);
  59         if (value)
  60                 tmp |= 1 << gpio;
  61         writel(tmp, gpio_out);
  62 }
  63
  64 static void titan_gpio_set_value(struct gpio_chip *chip,
  65                                 unsigned gpio, int value)
  66 {
  67         struct ar7_gpio_chip *gpch =
  68                                 container_of(chip, struct ar7_gpio_chip, chip);
  69         void __iomem *gpio_out0 = gpch->regs + TITAN_GPIO_OUTPUT_0;
  70         void __iomem *gpio_out1 = gpch->regs + TITAN_GPIO_OUTPUT_1;
  71         unsigned tmp;
  72
  73         tmp = readl(gpio >> 5 ? gpio_out1 : gpio_out0) & ~(1 << (gpio & 0x1f));
  74         if (value)
  75                 tmp |= 1 << (gpio & 0x1f);
  76         writel(tmp, gpio >> 5 ? gpio_out1 : gpio_out0);
  77 }
  78
  79 static int ar7_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
  80 {
  81         struct ar7_gpio_chip *gpch =
  82                                 container_of(chip, struct ar7_gpio_chip, chip);
  83         void __iomem *gpio_dir = gpch->regs + AR7_GPIO_DIR;
  84
  85         writel(readl(gpio_dir) | (1 << gpio), gpio_dir);
  86
  87         return 0;
  88 }
  89
  90 static int titan_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
  91 {
  92         struct ar7_gpio_chip *gpch =
  93                                 container_of(chip, struct ar7_gpio_chip, chip);
  94         void __iomem *gpio_dir0 = gpch->regs + TITAN_GPIO_DIR_0;
  95         void __iomem *gpio_dir1 = gpch->regs + TITAN_GPIO_DIR_1;
  96
  97         if (gpio >= TITAN_GPIO_MAX)
  98                 return -EINVAL;
  99
 100         writel(readl(gpio >> 5 ? gpio_dir1 : gpio_dir0) | (1 << (gpio & 0x1f)),
 101                         gpio >> 5 ? gpio_dir1 : gpio_dir0);
 102         return 0;
 103 }
 104
 105 static int ar7_gpio_direction_output(struct gpio_chip *chip,
 106                                         unsigned gpio, int value)
 107 {
 108         struct ar7_gpio_chip *gpch =
 109                                 container_of(chip, struct ar7_gpio_chip, chip);
 110         void __iomem *gpio_dir = gpch->regs + AR7_GPIO_DIR;
 111
 112         ar7_gpio_set_value(chip, gpio, value);
 113         writel(readl(gpio_dir) & ~(1 << gpio), gpio_dir);
 114
 115         return 0;
 116 }
 117
 118 static int titan_gpio_direction_output(struct gpio_chip *chip,
 119                                         unsigned gpio, int value)
 120 {
 121         struct ar7_gpio_chip *gpch =
 122                                 container_of(chip, struct ar7_gpio_chip, chip);
 123         void __iomem *gpio_dir0 = gpch->regs + TITAN_GPIO_DIR_0;
 124         void __iomem *gpio_dir1 = gpch->regs + TITAN_GPIO_DIR_1;
 125
 126         if (gpio >= TITAN_GPIO_MAX)
 127                 return -EINVAL;
 128
 129         titan_gpio_set_value(chip, gpio, value);
 130         writel(readl(gpio >> 5 ? gpio_dir1 : gpio_dir0) & ~(1 <<
 131                 (gpio & 0x1f)), gpio >> 5 ? gpio_dir1 : gpio_dir0);
 132
 133         return 0;
 134 }
 135
 136 static struct ar7_gpio_chip ar7_gpio_chip = {
 137         .chip = {
 138                 .label                  = "ar7-gpio",
 139                 .direction_input        = ar7_gpio_direction_input,
 140                 .direction_output       = ar7_gpio_direction_output,
 141                 .set                    = ar7_gpio_set_value,
 142                 .get                    = ar7_gpio_get_value,
 143                 .base                   = 0,
 144                 .ngpio                  = AR7_GPIO_MAX,
 145         }
 146 };
 147
 148 static struct ar7_gpio_chip titan_gpio_chip = {
 149         .chip = {
 150                 .label                  = "titan-gpio",
 151                 .direction_input        = titan_gpio_direction_input,
 152                 .direction_output       = titan_gpio_direction_output,
 153                 .set                    = titan_gpio_set_value,
 154                 .get                    = titan_gpio_get_value,
 155                 .base                   = 0,
 156                 .ngpio                  = TITAN_GPIO_MAX,
 157         }
 158 };
 159
 160 static inline int ar7_gpio_enable_ar7(unsigned gpio)
 161 {
 162         void __iomem *gpio_en = ar7_gpio_chip.regs + AR7_GPIO_ENABLE;
 163
 164         writel(readl(gpio_en) | (1 << gpio), gpio_en);
 165
 166         return 0;
 167 }
 168
 169 static inline int ar7_gpio_enable_titan(unsigned gpio)
 170 {
 171         void __iomem *gpio_en0 = titan_gpio_chip.regs  + TITAN_GPIO_ENBL_0;
 172         void __iomem *gpio_en1 = titan_gpio_chip.regs  + TITAN_GPIO_ENBL_1;
 173
 174         writel(readl(gpio >> 5 ? gpio_en1 : gpio_en0) | (1 << (gpio & 0x1f)),
 175                 gpio >> 5 ? gpio_en1 : gpio_en0);
 176
 177         return 0;
 178 }
 179
 180 int ar7_gpio_enable(unsigned gpio)
 181 {
 182         return ar7_is_titan() ? ar7_gpio_enable_titan(gpio) :
 183                                 ar7_gpio_enable_ar7(gpio);
 184 }
 185 EXPORT_SYMBOL(ar7_gpio_enable);
 186
 187 static inline int ar7_gpio_disable_ar7(unsigned gpio)
 188 {
 189         void __iomem *gpio_en = ar7_gpio_chip.regs + AR7_GPIO_ENABLE;
 190
 191         writel(readl(gpio_en) & ~(1 << gpio), gpio_en);
 192
 193         return 0;
 194 }
 195
 196 static inline int ar7_gpio_disable_titan(unsigned gpio)
 197 {
 198         void __iomem *gpio_en0 = titan_gpio_chip.regs + TITAN_GPIO_ENBL_0;
 199         void __iomem *gpio_en1 = titan_gpio_chip.regs + TITAN_GPIO_ENBL_1;
 200
 201         writel(readl(gpio >> 5 ? gpio_en1 : gpio_en0) & ~(1 << (gpio & 0x1f)),
 202                         gpio >> 5 ? gpio_en1 : gpio_en0);
 203
 204         return 0;
 205 }
 206
 207 int ar7_gpio_disable(unsigned gpio)
 208 {
 209         return ar7_is_titan() ? ar7_gpio_disable_titan(gpio) :
 210                                 ar7_gpio_disable_ar7(gpio);
 211 }
 212 EXPORT_SYMBOL(ar7_gpio_disable);
 213
 214 struct titan_gpio_cfg {
 215         u32 reg;
 216         u32 shift;
 217         u32 func;
 218 };
 219
 220 static const struct titan_gpio_cfg titan_gpio_table[] = {
 221         /* reg, start bit, mux value */
 222         {4, 24, 1},
 223         {4, 26, 1},
 224         {4, 28, 1},
 225         {4, 30, 1},
 226         {5, 6, 1},
 227         {5, 8, 1},
 228         {5, 10, 1},
 229         {5, 12, 1},
 230         {7, 14, 3},
 231         {7, 16, 3},
 232         {7, 18, 3},
 233         {7, 20, 3},
 234         {7, 22, 3},
 235         {7, 26, 3},
 236         {7, 28, 3},
 237         {7, 30, 3},
 238         {8, 0, 3},
 239         {8, 2, 3},
 240         {8, 4, 3},
 241         {8, 10, 3},
 242         {8, 14, 3},
 243         {8, 16, 3},
 244         {8, 18, 3},
 245         {8, 20, 3},
 246         {9, 8, 3},
 247         {9, 10, 3},
 248         {9, 12, 3},
 249         {9, 14, 3},
 250         {9, 18, 3},
 251         {9, 20, 3},
 252         {9, 24, 3},
 253         {9, 26, 3},
 254         {9, 28, 3},
 255         {9, 30, 3},
 256         {10, 0, 3},
 257         {10, 2, 3},
 258         {10, 8, 3},
 259         {10, 10, 3},
 260         {10, 12, 3},
 261         {10, 14, 3},
 262         {13, 12, 3},
 263         {13, 14, 3},
 264         {13, 16, 3},
 265         {13, 18, 3},
 266         {13, 24, 3},
 267         {13, 26, 3},
 268         {13, 28, 3},
 269         {13, 30, 3},
 270         {14, 2, 3},
 271         {14, 6, 3},
 272         {14, 8, 3},
 273         {14, 12, 3}
 274 };
 275
 276 static int titan_gpio_pinsel(unsigned gpio)
 277 {
 278         struct titan_gpio_cfg gpio_cfg;
 279         u32 mux_status, pin_sel_reg, tmp;
 280         void __iomem *pin_sel = (void __iomem *)KSEG1ADDR(AR7_REGS_PINSEL);
 281
 282         if (gpio >= ARRAY_SIZE(titan_gpio_table))
 283                 return -EINVAL;
 284
 285         gpio_cfg = titan_gpio_table[gpio];
 286         pin_sel_reg = gpio_cfg.reg - 1;
 287
 288         mux_status = (readl(pin_sel + pin_sel_reg) >> gpio_cfg.shift) & 0x3;
 289
 290         /* Check the mux status */
 291         if (!((mux_status == 0) || (mux_status == gpio_cfg.func)))
 292                 return 0;
 293
 294         /* Set the pin sel value */
 295         tmp = readl(pin_sel + pin_sel_reg);
 296         tmp |= ((gpio_cfg.func & 0x3) << gpio_cfg.shift);
 297         writel(tmp, pin_sel + pin_sel_reg);
 298
 299         return 0;
 300 }
 301
 302 /* Perform minimal Titan GPIO configuration */
 303 static void titan_gpio_init(void)
 304 {
 305         unsigned i;
 306
 307         for (i = 44; i < 48; i++) {
 308                 titan_gpio_pinsel(i);
 309                 ar7_gpio_enable_titan(i);
 310                 titan_gpio_direction_input(&titan_gpio_chip.chip, i);
 311         }
 312 }
 313
 314 int __init ar7_gpio_init(void)
 315 {
 316         int ret;
 317         struct ar7_gpio_chip *gpch;
 318         unsigned size;
 319
 320         if (!ar7_is_titan()) {
 321                 gpch = &ar7_gpio_chip;
 322                 size = 0x10;
 323         } else {
 324                 gpch = &titan_gpio_chip;
 325                 size = 0x1f;
 326         }
 327
 328         gpch->regs = ioremap_nocache(AR7_REGS_GPIO, size);
 329         if (!gpch->regs) {
 330                 printk(KERN_ERR "%s: failed to ioremap regs\n",
 331                                         gpch->chip.label);
 332                 return -ENOMEM;
 333         }
 334
 335         ret = gpiochip_add(&gpch->chip);
 336         if (ret) {
 337                 printk(KERN_ERR "%s: failed to add gpiochip\n",
 338                                         gpch->chip.label);
 339                 return ret;
 340         }
 341         printk(KERN_INFO "%s: registered %d GPIOs\n",
 342                                 gpch->chip.label, gpch->chip.ngpio);
 343
 344         if (ar7_is_titan())
 345                 titan_gpio_init();
 346
 347         return ret;
 348 }