drivers/mfd/atc260x-core.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Core support for ATC260x PMICs
   4  *
   5  * Copyright (C) 2019 Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
   6  * Copyright (C) 2020 Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
   7  */
   8
   9 #include <linux/interrupt.h>
  10 #include <linux/mfd/atc260x/core.h>
  11 #include <linux/mfd/core.h>
  12 #include <linux/module.h>
  13 #include <linux/of.h>
  14 #include <linux/of_device.h>
  15 #include <linux/regmap.h>
  16
  17 #define ATC260X_CHIP_REV_MAX    31
  18
  19 struct atc260x_init_regs {
  20         unsigned int cmu_devrst;
  21         unsigned int cmu_devrst_ints;
  22         unsigned int ints_msk;
  23         unsigned int pad_en;
  24         unsigned int pad_en_extirq;
  25 };
  26
  27 static void regmap_lock_mutex(void *__mutex)
  28 {
  29         struct mutex *mutex = __mutex;
  30
  31         /*
  32          * Using regmap within an atomic context (e.g. accessing a PMIC when
  33          * powering system down) is normally allowed only if the regmap type
  34          * is MMIO and the regcache type is either REGCACHE_NONE or
  35          * REGCACHE_FLAT. For slow buses like I2C and SPI, the regmap is
  36          * internally protected by a mutex which is acquired non-atomically.
  37          *
  38          * Let's improve this by using a customized locking scheme inspired
  39          * from I2C atomic transfer. See i2c_in_atomic_xfer_mode() for a
  40          * starting point.
  41          */
  42         if (system_state > SYSTEM_RUNNING && irqs_disabled())
  43                 mutex_trylock(mutex);
  44         else
  45                 mutex_lock(mutex);
  46 }
  47
  48 static void regmap_unlock_mutex(void *__mutex)
  49 {
  50         struct mutex *mutex = __mutex;
  51
  52         mutex_unlock(mutex);
  53 }
  54
  55 static const struct regmap_config atc2603c_regmap_config = {
  56         .reg_bits = 8,
  57         .val_bits = 16,
  58         .max_register = ATC2603C_SADDR,
  59         .cache_type = REGCACHE_NONE,
  60 };
  61
  62 static const struct regmap_config atc2609a_regmap_config = {
  63         .reg_bits = 8,
  64         .val_bits = 16,
  65         .max_register = ATC2609A_SADDR,
  66         .cache_type = REGCACHE_NONE,
  67 };
  68
  69 static const struct regmap_irq atc2603c_regmap_irqs[] = {
  70         REGMAP_IRQ_REG(ATC2603C_IRQ_AUDIO,      0, ATC2603C_INTS_MSK_AUDIO),
  71         REGMAP_IRQ_REG(ATC2603C_IRQ_OV,         0, ATC2603C_INTS_MSK_OV),
  72         REGMAP_IRQ_REG(ATC2603C_IRQ_OC,         0, ATC2603C_INTS_MSK_OC),
  73         REGMAP_IRQ_REG(ATC2603C_IRQ_OT,         0, ATC2603C_INTS_MSK_OT),
  74         REGMAP_IRQ_REG(ATC2603C_IRQ_UV,         0, ATC2603C_INTS_MSK_UV),
  75         REGMAP_IRQ_REG(ATC2603C_IRQ_ALARM,      0, ATC2603C_INTS_MSK_ALARM),
  76         REGMAP_IRQ_REG(ATC2603C_IRQ_ONOFF,      0, ATC2603C_INTS_MSK_ONOFF),
  77         REGMAP_IRQ_REG(ATC2603C_IRQ_SGPIO,      0, ATC2603C_INTS_MSK_SGPIO),
  78         REGMAP_IRQ_REG(ATC2603C_IRQ_IR,         0, ATC2603C_INTS_MSK_IR),
  79         REGMAP_IRQ_REG(ATC2603C_IRQ_REMCON,     0, ATC2603C_INTS_MSK_REMCON),
  80         REGMAP_IRQ_REG(ATC2603C_IRQ_POWER_IN,   0, ATC2603C_INTS_MSK_POWERIN),
  81 };
  82
  83 static const struct regmap_irq atc2609a_regmap_irqs[] = {
  84         REGMAP_IRQ_REG(ATC2609A_IRQ_AUDIO,      0, ATC2609A_INTS_MSK_AUDIO),
  85         REGMAP_IRQ_REG(ATC2609A_IRQ_OV,         0, ATC2609A_INTS_MSK_OV),
  86         REGMAP_IRQ_REG(ATC2609A_IRQ_OC,         0, ATC2609A_INTS_MSK_OC),
  87         REGMAP_IRQ_REG(ATC2609A_IRQ_OT,         0, ATC2609A_INTS_MSK_OT),
  88         REGMAP_IRQ_REG(ATC2609A_IRQ_UV,         0, ATC2609A_INTS_MSK_UV),
  89         REGMAP_IRQ_REG(ATC2609A_IRQ_ALARM,      0, ATC2609A_INTS_MSK_ALARM),
  90         REGMAP_IRQ_REG(ATC2609A_IRQ_ONOFF,      0, ATC2609A_INTS_MSK_ONOFF),
  91         REGMAP_IRQ_REG(ATC2609A_IRQ_WKUP,       0, ATC2609A_INTS_MSK_WKUP),
  92         REGMAP_IRQ_REG(ATC2609A_IRQ_IR,         0, ATC2609A_INTS_MSK_IR),
  93         REGMAP_IRQ_REG(ATC2609A_IRQ_REMCON,     0, ATC2609A_INTS_MSK_REMCON),
  94         REGMAP_IRQ_REG(ATC2609A_IRQ_POWER_IN,   0, ATC2609A_INTS_MSK_POWERIN),
  95 };
  96
  97 static const struct regmap_irq_chip atc2603c_regmap_irq_chip = {
  98         .name = "atc2603c",
  99         .irqs = atc2603c_regmap_irqs,
 100         .num_irqs = ARRAY_SIZE(atc2603c_regmap_irqs),
 101         .num_regs = 1,
 102         .status_base = ATC2603C_INTS_PD,
 103         .unmask_base = ATC2603C_INTS_MSK,
 104 };
 105
 106 static const struct regmap_irq_chip atc2609a_regmap_irq_chip = {
 107         .name = "atc2609a",
 108         .irqs = atc2609a_regmap_irqs,
 109         .num_irqs = ARRAY_SIZE(atc2609a_regmap_irqs),
 110         .num_regs = 1,
 111         .status_base = ATC2609A_INTS_PD,
 112         .unmask_base = ATC2609A_INTS_MSK,
 113 };
 114
 115 static const struct resource atc2603c_onkey_resources[] = {
 116         DEFINE_RES_IRQ(ATC2603C_IRQ_ONOFF),
 117 };
 118
 119 static const struct resource atc2609a_onkey_resources[] = {
 120         DEFINE_RES_IRQ(ATC2609A_IRQ_ONOFF),
 121 };
 122
 123 static const struct mfd_cell atc2603c_mfd_cells[] = {
 124         { .name = "atc260x-regulator" },
 125         { .name = "atc260x-pwrc" },
 126         {
 127                 .name = "atc260x-onkey",
 128                 .num_resources = ARRAY_SIZE(atc2603c_onkey_resources),
 129                 .resources = atc2603c_onkey_resources,
 130         },
 131 };
 132
 133 static const struct mfd_cell atc2609a_mfd_cells[] = {
 134         { .name = "atc260x-regulator" },
 135         { .name = "atc260x-pwrc" },
 136         {
 137                 .name = "atc260x-onkey",
 138                 .num_resources = ARRAY_SIZE(atc2609a_onkey_resources),
 139                 .resources = atc2609a_onkey_resources,
 140         },
 141 };
 142
 143 static const struct atc260x_init_regs atc2603c_init_regs = {
 144         .cmu_devrst = ATC2603C_CMU_DEVRST,
 145         .cmu_devrst_ints = ATC2603C_CMU_DEVRST_INTS,
 146         .ints_msk = ATC2603C_INTS_MSK,
 147         .pad_en = ATC2603C_PAD_EN,
 148         .pad_en_extirq = ATC2603C_PAD_EN_EXTIRQ,
 149 };
 150
 151 static const struct atc260x_init_regs atc2609a_init_regs = {
 152         .cmu_devrst = ATC2609A_CMU_DEVRST,
 153         .cmu_devrst_ints = ATC2609A_CMU_DEVRST_INTS,
 154         .ints_msk = ATC2609A_INTS_MSK,
 155         .pad_en = ATC2609A_PAD_EN,
 156         .pad_en_extirq = ATC2609A_PAD_EN_EXTIRQ,
 157 };
 158
 159 static void atc260x_cmu_reset(struct atc260x *atc260x)
 160 {
 161         const struct atc260x_init_regs *regs = atc260x->init_regs;
 162
 163         /* Assert reset */
 164         regmap_update_bits(atc260x->regmap, regs->cmu_devrst,
 165                            regs->cmu_devrst_ints, ~regs->cmu_devrst_ints);
 166
 167         /* De-assert reset */
 168         regmap_update_bits(atc260x->regmap, regs->cmu_devrst,
 169                            regs->cmu_devrst_ints, regs->cmu_devrst_ints);
 170 }
 171
 172 static void atc260x_dev_init(struct atc260x *atc260x)
 173 {
 174         const struct atc260x_init_regs *regs = atc260x->init_regs;
 175
 176         /* Initialize interrupt block */
 177         atc260x_cmu_reset(atc260x);
 178
 179         /* Disable all interrupt sources */
 180         regmap_write(atc260x->regmap, regs->ints_msk, 0);
 181
 182         /* Enable EXTIRQ pad */
 183         regmap_update_bits(atc260x->regmap, regs->pad_en,
 184                            regs->pad_en_extirq, regs->pad_en_extirq);
 185 }
 186
 187 /**
 188  * atc260x_match_device(): Setup ATC260x variant related fields
 189  *
 190  * @atc260x: ATC260x device to setup (.dev field must be set)
 191  * @regmap_cfg: regmap config associated with this ATC260x device
 192  *
 193  * This lets the ATC260x core configure the MFD cells and register maps
 194  * for later use.
 195  */
 196 int atc260x_match_device(struct atc260x *atc260x, struct regmap_config *regmap_cfg)
 197 {
 198         struct device *dev = atc260x->dev;
 199         const void *of_data;
 200
 201         of_data = of_device_get_match_data(dev);
 202         if (!of_data)
 203                 return -ENODEV;
 204
 205         atc260x->ic_type = (unsigned long)of_data;
 206
 207         switch (atc260x->ic_type) {
 208         case ATC2603C:
 209                 *regmap_cfg = atc2603c_regmap_config;
 210                 atc260x->regmap_irq_chip = &atc2603c_regmap_irq_chip;
 211                 atc260x->cells = atc2603c_mfd_cells;
 212                 atc260x->nr_cells = ARRAY_SIZE(atc2603c_mfd_cells);
 213                 atc260x->type_name = "atc2603c";
 214                 atc260x->rev_reg = ATC2603C_CHIP_VER;
 215                 atc260x->init_regs = &atc2603c_init_regs;
 216                 break;
 217         case ATC2609A:
 218                 *regmap_cfg = atc2609a_regmap_config;
 219                 atc260x->regmap_irq_chip = &atc2609a_regmap_irq_chip;
 220                 atc260x->cells = atc2609a_mfd_cells;
 221                 atc260x->nr_cells = ARRAY_SIZE(atc2609a_mfd_cells);
 222                 atc260x->type_name = "atc2609a";
 223                 atc260x->rev_reg = ATC2609A_CHIP_VER;
 224                 atc260x->init_regs = &atc2609a_init_regs;
 225                 break;
 226         default:
 227                 dev_err(dev, "Unsupported ATC260x device type: %u\n",
 228                         atc260x->ic_type);
 229                 return -EINVAL;
 230         }
 231
 232         atc260x->regmap_mutex = devm_kzalloc(dev, sizeof(*atc260x->regmap_mutex),
 233                                              GFP_KERNEL);
 234         if (!atc260x->regmap_mutex)
 235                 return -ENOMEM;
 236
 237         mutex_init(atc260x->regmap_mutex);
 238
 239         regmap_cfg->lock = regmap_lock_mutex,
 240         regmap_cfg->unlock = regmap_unlock_mutex,
 241         regmap_cfg->lock_arg = atc260x->regmap_mutex;
 242
 243         return 0;
 244 }
 245 EXPORT_SYMBOL_GPL(atc260x_match_device);
 246
 247 /**
 248  * atc260x_device_probe(): Probe a configured ATC260x device
 249  *
 250  * @atc260x: ATC260x device to probe (must be configured)
 251  *
 252  * This function lets the ATC260x core register the ATC260x MFD devices
 253  * and IRQCHIP. The ATC260x device passed in must be fully configured
 254  * with atc260x_match_device, its IRQ set, and regmap created.
 255  */
 256 int atc260x_device_probe(struct atc260x *atc260x)
 257 {
 258         struct device *dev = atc260x->dev;
 259         unsigned int chip_rev;
 260         int ret;
 261
 262         if (!atc260x->irq) {
 263                 dev_err(dev, "No interrupt support\n");
 264                 return -EINVAL;
 265         }
 266
 267         /* Initialize the hardware */
 268         atc260x_dev_init(atc260x);
 269
 270         ret = regmap_read(atc260x->regmap, atc260x->rev_reg, &chip_rev);
 271         if (ret) {
 272                 dev_err(dev, "Failed to get chip revision\n");
 273                 return ret;
 274         }
 275
 276         if (chip_rev > ATC260X_CHIP_REV_MAX) {
 277                 dev_err(dev, "Unknown chip revision: %u\n", chip_rev);
 278                 return -EINVAL;
 279         }
 280
 281         atc260x->ic_ver = __ffs(chip_rev + 1U);
 282
 283         dev_info(dev, "Detected chip type %s rev.%c\n",
 284                  atc260x->type_name, 'A' + atc260x->ic_ver);
 285
 286         ret = devm_regmap_add_irq_chip(dev, atc260x->regmap, atc260x->irq, IRQF_ONESHOT,
 287                                        -1, atc260x->regmap_irq_chip, &atc260x->irq_data);
 288         if (ret) {
 289                 dev_err(dev, "Failed to add IRQ chip: %d\n", ret);
 290                 return ret;
 291         }
 292
 293         ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
 294                                    atc260x->cells, atc260x->nr_cells, NULL, 0,
 295                                    regmap_irq_get_domain(atc260x->irq_data));
 296         if (ret) {
 297                 dev_err(dev, "Failed to add child devices: %d\n", ret);
 298                 regmap_del_irq_chip(atc260x->irq, atc260x->irq_data);
 299         }
 300
 301         return ret;
 302 }
 303 EXPORT_SYMBOL_GPL(atc260x_device_probe);
 304
 305 MODULE_DESCRIPTION("ATC260x PMICs Core support");
 306 MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
 307 MODULE_AUTHOR("Cristian Ciocaltea <cristian.ciocaltea@gmail.com>");
 308 MODULE_LICENSE("GPL");