drivers/gpio/gpio-crystalcove.c

   1 /*
   2  * gpio-crystalcove.c - Intel Crystal Cove GPIO Driver
   3  *
   4  * Copyright (C) 2012, 2014 Intel Corporation. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License version
   8  * 2 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  * Author: Yang, Bin <bin.yang@intel.com>
  16  */
  17
  18 #include <linux/interrupt.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/gpio.h>
  21 #include <linux/seq_file.h>
  22 #include <linux/bitops.h>
  23 #include <linux/regmap.h>
  24 #include <linux/mfd/intel_soc_pmic.h>
  25
  26 #define CRYSTALCOVE_GPIO_NUM    16
  27 #define CRYSTALCOVE_VGPIO_NUM   95
  28
  29 #define UPDATE_IRQ_TYPE         BIT(0)
  30 #define UPDATE_IRQ_MASK         BIT(1)
  31
  32 #define GPIO0IRQ                0x0b
  33 #define GPIO1IRQ                0x0c
  34 #define MGPIO0IRQS0             0x19
  35 #define MGPIO1IRQS0             0x1a
  36 #define MGPIO0IRQSX             0x1b
  37 #define MGPIO1IRQSX             0x1c
  38 #define GPIO0P0CTLO             0x2b
  39 #define GPIO0P0CTLI             0x33
  40 #define GPIO1P0CTLO             0x3b
  41 #define GPIO1P0CTLI             0x43
  42 #define GPIOPANELCTL            0x52
  43
  44 #define CTLI_INTCNT_DIS         (0)
  45 #define CTLI_INTCNT_NE          (1 << 1)
  46 #define CTLI_INTCNT_PE          (2 << 1)
  47 #define CTLI_INTCNT_BE          (3 << 1)
  48
  49 #define CTLO_DIR_IN             (0)
  50 #define CTLO_DIR_OUT            (1 << 5)
  51
  52 #define CTLO_DRV_CMOS           (0)
  53 #define CTLO_DRV_OD             (1 << 4)
  54
  55 #define CTLO_DRV_REN            (1 << 3)
  56
  57 #define CTLO_RVAL_2KDW          (0)
  58 #define CTLO_RVAL_2KUP          (1 << 1)
  59 #define CTLO_RVAL_50KDW         (2 << 1)
  60 #define CTLO_RVAL_50KUP         (3 << 1)
  61
  62 #define CTLO_INPUT_SET  (CTLO_DRV_CMOS | CTLO_DRV_REN | CTLO_RVAL_2KUP)
  63 #define CTLO_OUTPUT_SET (CTLO_DIR_OUT | CTLO_INPUT_SET)
  64
  65 enum ctrl_register {
  66         CTRL_IN,
  67         CTRL_OUT,
  68 };
  69
  70 /**
  71  * struct crystalcove_gpio - Crystal Cove GPIO controller
  72  * @buslock: for bus lock/sync and unlock.
  73  * @chip: the abstract gpio_chip structure.
  74  * @regmap: the regmap from the parent device.
  75  * @update: pending IRQ setting update, to be written to the chip upon unlock.
  76  * @intcnt_value: the Interrupt Detect value to be written.
  77  * @set_irq_mask: true if the IRQ mask needs to be set, false to clear.
  78  */
  79 struct crystalcove_gpio {
  80         struct mutex buslock; /* irq_bus_lock */
  81         struct gpio_chip chip;
  82         struct regmap *regmap;
  83         int update;
  84         int intcnt_value;
  85         bool set_irq_mask;
  86 };
  87
  88 static inline struct crystalcove_gpio *to_cg(struct gpio_chip *gc)
  89 {
  90         return container_of(gc, struct crystalcove_gpio, chip);
  91 }
  92
  93 static inline int to_reg(int gpio, enum ctrl_register reg_type)
  94 {
  95         int reg;
  96
  97         if (gpio == 94) {
  98                 return GPIOPANELCTL;
  99         }
 100
 101         if (reg_type == CTRL_IN) {
 102                 if (gpio < 8)
 103                         reg = GPIO0P0CTLI;
 104                 else
 105                         reg = GPIO1P0CTLI;
 106         } else {
 107                 if (gpio < 8)
 108                         reg = GPIO0P0CTLO;
 109                 else
 110                         reg = GPIO1P0CTLO;
 111         }
 112
 113         return reg + gpio % 8;
 114 }
 115
 116 static void crystalcove_update_irq_mask(struct crystalcove_gpio *cg,
 117                                         int gpio)
 118 {
 119         u8 mirqs0 = gpio < 8 ? MGPIO0IRQS0 : MGPIO1IRQS0;
 120         int mask = BIT(gpio % 8);
 121
 122         if (cg->set_irq_mask)
 123                 regmap_update_bits(cg->regmap, mirqs0, mask, mask);
 124         else
 125                 regmap_update_bits(cg->regmap, mirqs0, mask, 0);
 126 }
 127
 128 static void crystalcove_update_irq_ctrl(struct crystalcove_gpio *cg, int gpio)
 129 {
 130         int reg = to_reg(gpio, CTRL_IN);
 131
 132         regmap_update_bits(cg->regmap, reg, CTLI_INTCNT_BE, cg->intcnt_value);
 133 }
 134
 135 static int crystalcove_gpio_dir_in(struct gpio_chip *chip, unsigned gpio)
 136 {
 137         struct crystalcove_gpio *cg = to_cg(chip);
 138
 139         if (gpio > CRYSTALCOVE_VGPIO_NUM)
 140                 return 0;
 141
 142         return regmap_write(cg->regmap, to_reg(gpio, CTRL_OUT),
 143                             CTLO_INPUT_SET);
 144 }
 145
 146 static int crystalcove_gpio_dir_out(struct gpio_chip *chip, unsigned gpio,
 147                                     int value)
 148 {
 149         struct crystalcove_gpio *cg = to_cg(chip);
 150
 151         if (gpio > CRYSTALCOVE_VGPIO_NUM)
 152                 return 0;
 153
 154         return regmap_write(cg->regmap, to_reg(gpio, CTRL_OUT),
 155                             CTLO_OUTPUT_SET | value);
 156 }
 157
 158 static int crystalcove_gpio_get(struct gpio_chip *chip, unsigned gpio)
 159 {
 160         struct crystalcove_gpio *cg = to_cg(chip);
 161         int ret;
 162         unsigned int val;
 163
 164         if (gpio > CRYSTALCOVE_VGPIO_NUM)
 165                 return 0;
 166
 167         ret = regmap_read(cg->regmap, to_reg(gpio, CTRL_IN), &val);
 168         if (ret)
 169                 return ret;
 170
 171         return val & 0x1;
 172 }
 173
 174 static void crystalcove_gpio_set(struct gpio_chip *chip,
 175                                  unsigned gpio, int value)
 176 {
 177         struct crystalcove_gpio *cg = to_cg(chip);
 178
 179         if (gpio > CRYSTALCOVE_VGPIO_NUM)
 180                 return;
 181
 182         if (value)
 183                 regmap_update_bits(cg->regmap, to_reg(gpio, CTRL_OUT), 1, 1);
 184         else
 185                 regmap_update_bits(cg->regmap, to_reg(gpio, CTRL_OUT), 1, 0);
 186 }
 187
 188 static int crystalcove_irq_type(struct irq_data *data, unsigned type)
 189 {
 190         struct crystalcove_gpio *cg = to_cg(irq_data_get_irq_chip_data(data));
 191
 192         switch (type) {
 193         case IRQ_TYPE_NONE:
 194                 cg->intcnt_value = CTLI_INTCNT_DIS;
 195                 break;
 196         case IRQ_TYPE_EDGE_BOTH:
 197                 cg->intcnt_value = CTLI_INTCNT_BE;
 198                 break;
 199         case IRQ_TYPE_EDGE_RISING:
 200                 cg->intcnt_value = CTLI_INTCNT_PE;
 201                 break;
 202         case IRQ_TYPE_EDGE_FALLING:
 203                 cg->intcnt_value = CTLI_INTCNT_NE;
 204                 break;
 205         default:
 206                 return -EINVAL;
 207         }
 208
 209         cg->update |= UPDATE_IRQ_TYPE;
 210
 211         return 0;
 212 }
 213
 214 static void crystalcove_bus_lock(struct irq_data *data)
 215 {
 216         struct crystalcove_gpio *cg = to_cg(irq_data_get_irq_chip_data(data));
 217
 218         mutex_lock(&cg->buslock);
 219 }
 220
 221 static void crystalcove_bus_sync_unlock(struct irq_data *data)
 222 {
 223         struct crystalcove_gpio *cg = to_cg(irq_data_get_irq_chip_data(data));
 224         int gpio = data->hwirq;
 225
 226         if (cg->update & UPDATE_IRQ_TYPE)
 227                 crystalcove_update_irq_ctrl(cg, gpio);
 228         if (cg->update & UPDATE_IRQ_MASK)
 229                 crystalcove_update_irq_mask(cg, gpio);
 230         cg->update = 0;
 231
 232         mutex_unlock(&cg->buslock);
 233 }
 234
 235 static void crystalcove_irq_unmask(struct irq_data *data)
 236 {
 237         struct crystalcove_gpio *cg = to_cg(irq_data_get_irq_chip_data(data));
 238
 239         cg->set_irq_mask = false;
 240         cg->update |= UPDATE_IRQ_MASK;
 241 }
 242
 243 static void crystalcove_irq_mask(struct irq_data *data)
 244 {
 245         struct crystalcove_gpio *cg = to_cg(irq_data_get_irq_chip_data(data));
 246
 247         cg->set_irq_mask = true;
 248         cg->update |= UPDATE_IRQ_MASK;
 249 }
 250
 251 static struct irq_chip crystalcove_irqchip = {
 252         .name                   = "Crystal Cove",
 253         .irq_mask               = crystalcove_irq_mask,
 254         .irq_unmask             = crystalcove_irq_unmask,
 255         .irq_set_type           = crystalcove_irq_type,
 256         .irq_bus_lock           = crystalcove_bus_lock,
 257         .irq_bus_sync_unlock    = crystalcove_bus_sync_unlock,
 258         .flags                  = IRQCHIP_SKIP_SET_WAKE,
 259 };
 260
 261 static irqreturn_t crystalcove_gpio_irq_handler(int irq, void *data)
 262 {
 263         struct crystalcove_gpio *cg = data;
 264         unsigned int p0, p1;
 265         int pending;
 266         int gpio;
 267         unsigned int virq;
 268
 269         if (regmap_read(cg->regmap, GPIO0IRQ, &p0) ||
 270             regmap_read(cg->regmap, GPIO1IRQ, &p1))
 271                 return IRQ_NONE;
 272
 273         regmap_write(cg->regmap, GPIO0IRQ, p0);
 274         regmap_write(cg->regmap, GPIO1IRQ, p1);
 275
 276         pending = p0 | p1 << 8;
 277
 278         for (gpio = 0; gpio < CRYSTALCOVE_GPIO_NUM; gpio++) {
 279                 if (pending & BIT(gpio)) {
 280                         virq = irq_find_mapping(cg->chip.irqdomain, gpio);
 281                         handle_nested_irq(virq);
 282                 }
 283         }
 284
 285         return IRQ_HANDLED;
 286 }
 287
 288 static void crystalcove_gpio_dbg_show(struct seq_file *s,
 289                                       struct gpio_chip *chip)
 290 {
 291         struct crystalcove_gpio *cg = to_cg(chip);
 292         int gpio, offset;
 293         unsigned int ctlo, ctli, mirqs0, mirqsx, irq;
 294
 295         for (gpio = 0; gpio < CRYSTALCOVE_GPIO_NUM; gpio++) {
 296                 regmap_read(cg->regmap, to_reg(gpio, CTRL_OUT), &ctlo);
 297                 regmap_read(cg->regmap, to_reg(gpio, CTRL_IN), &ctli);
 298                 regmap_read(cg->regmap, gpio < 8 ? MGPIO0IRQS0 : MGPIO1IRQS0,
 299                             &mirqs0);
 300                 regmap_read(cg->regmap, gpio < 8 ? MGPIO0IRQSX : MGPIO1IRQSX,
 301                             &mirqsx);
 302                 regmap_read(cg->regmap, gpio < 8 ? GPIO0IRQ : GPIO1IRQ,
 303                             &irq);
 304
 305                 offset = gpio % 8;
 306                 seq_printf(s, " gpio-%-2d %s %s %s %s ctlo=%2x,%s %s %s\n",
 307                            gpio, ctlo & CTLO_DIR_OUT ? "out" : "in ",
 308                            ctli & 0x1 ? "hi" : "lo",
 309                            ctli & CTLI_INTCNT_NE ? "fall" : "    ",
 310                            ctli & CTLI_INTCNT_PE ? "rise" : "    ",
 311                            ctlo,
 312                            mirqs0 & BIT(offset) ? "s0 mask  " : "s0 unmask",
 313                            mirqsx & BIT(offset) ? "sx mask  " : "sx unmask",
 314                            irq & BIT(offset) ? "pending" : "       ");
 315         }
 316 }
 317
 318 static int crystalcove_gpio_probe(struct platform_device *pdev)
 319 {
 320         int irq = platform_get_irq(pdev, 0);
 321         struct crystalcove_gpio *cg;
 322         int retval;
 323         struct device *dev = pdev->dev.parent;
 324         struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
 325
 326         if (irq < 0)
 327                 return irq;
 328
 329         cg = devm_kzalloc(&pdev->dev, sizeof(*cg), GFP_KERNEL);
 330         if (!cg)
 331                 return -ENOMEM;
 332
 333         platform_set_drvdata(pdev, cg);
 334
 335         mutex_init(&cg->buslock);
 336         cg->chip.label = KBUILD_MODNAME;
 337         cg->chip.direction_input = crystalcove_gpio_dir_in;
 338         cg->chip.direction_output = crystalcove_gpio_dir_out;
 339         cg->chip.get = crystalcove_gpio_get;
 340         cg->chip.set = crystalcove_gpio_set;
 341         cg->chip.base = -1;
 342         cg->chip.ngpio = CRYSTALCOVE_VGPIO_NUM;
 343         cg->chip.can_sleep = true;
 344         cg->chip.dev = dev;
 345         cg->chip.dbg_show = crystalcove_gpio_dbg_show;
 346         cg->regmap = pmic->regmap;
 347
 348         retval = gpiochip_add(&cg->chip);
 349         if (retval) {
 350                 dev_warn(&pdev->dev, "add gpio chip error: %d\n", retval);
 351                 return retval;
 352         }
 353
 354         gpiochip_irqchip_add(&cg->chip, &crystalcove_irqchip, 0,
 355                              handle_simple_irq, IRQ_TYPE_NONE);
 356
 357         retval = request_threaded_irq(irq, NULL, crystalcove_gpio_irq_handler,
 358                                       IRQF_ONESHOT, KBUILD_MODNAME, cg);
 359
 360         if (retval) {
 361                 dev_warn(&pdev->dev, "request irq failed: %d\n", retval);
 362                 goto out_remove_gpio;
 363         }
 364
 365         return 0;
 366
 367 out_remove_gpio:
 368         gpiochip_remove(&cg->chip);
 369         return retval;
 370 }
 371
 372 static int crystalcove_gpio_remove(struct platform_device *pdev)
 373 {
 374         struct crystalcove_gpio *cg = platform_get_drvdata(pdev);
 375         int irq = platform_get_irq(pdev, 0);
 376
 377         gpiochip_remove(&cg->chip);
 378         if (irq >= 0)
 379                 free_irq(irq, cg);
 380         return 0;
 381 }
 382
 383 static struct platform_driver crystalcove_gpio_driver = {
 384         .probe = crystalcove_gpio_probe,
 385         .remove = crystalcove_gpio_remove,
 386         .driver = {
 387                 .name = "crystal_cove_gpio",
 388         },
 389 };
 390
 391 module_platform_driver(crystalcove_gpio_driver);
 392
 393 MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>");
 394 MODULE_DESCRIPTION("Intel Crystal Cove GPIO Driver");
 395 MODULE_LICENSE("GPL v2");