drivers/mfd/qcom-pm8008.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2021, The Linux Foundation. All rights reserved.
   4  */
   5
   6 #include <linux/bitops.h>
   7 #include <linux/gpio/consumer.h>
   8 #include <linux/i2c.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/ioport.h>
  11 #include <linux/irq.h>
  12 #include <linux/irqdomain.h>
  13 #include <linux/mfd/core.h>
  14 #include <linux/module.h>
  15 #include <linux/of.h>
  16 #include <linux/of_platform.h>
  17 #include <linux/pinctrl/consumer.h>
  18 #include <linux/regmap.h>
  19 #include <linux/slab.h>
  20
  21 #define I2C_INTR_STATUS_BASE            0x0550
  22 #define INT_RT_STS_OFFSET               0x10
  23 #define INT_SET_TYPE_OFFSET             0x11
  24 #define INT_POL_HIGH_OFFSET             0x12
  25 #define INT_POL_LOW_OFFSET              0x13
  26 #define INT_LATCHED_CLR_OFFSET          0x14
  27 #define INT_EN_SET_OFFSET               0x15
  28 #define INT_EN_CLR_OFFSET               0x16
  29 #define INT_LATCHED_STS_OFFSET          0x18
  30
  31 enum {
  32         PM8008_MISC,
  33         PM8008_TEMP_ALARM,
  34         PM8008_GPIO1,
  35         PM8008_GPIO2,
  36         PM8008_NUM_PERIPHS,
  37 };
  38
  39 #define PM8008_PERIPH_0_BASE    0x900
  40 #define PM8008_PERIPH_1_BASE    0x2400
  41 #define PM8008_PERIPH_2_BASE    0xc000
  42 #define PM8008_PERIPH_3_BASE    0xc100
  43
  44 #define PM8008_TEMP_ALARM_ADDR  PM8008_PERIPH_1_BASE
  45 #define PM8008_GPIO1_ADDR       PM8008_PERIPH_2_BASE
  46 #define PM8008_GPIO2_ADDR       PM8008_PERIPH_3_BASE
  47
  48 /* PM8008 IRQ numbers */
  49 #define PM8008_IRQ_MISC_UVLO    0
  50 #define PM8008_IRQ_MISC_OVLO    1
  51 #define PM8008_IRQ_MISC_OTST2   2
  52 #define PM8008_IRQ_MISC_OTST3   3
  53 #define PM8008_IRQ_MISC_LDO_OCP 4
  54 #define PM8008_IRQ_TEMP_ALARM   5
  55 #define PM8008_IRQ_GPIO1        6
  56 #define PM8008_IRQ_GPIO2        7
  57
  58 enum {
  59         SET_TYPE_INDEX,
  60         POLARITY_HI_INDEX,
  61         POLARITY_LO_INDEX,
  62 };
  63
  64 static const unsigned int pm8008_config_regs[] = {
  65         INT_SET_TYPE_OFFSET,
  66         INT_POL_HIGH_OFFSET,
  67         INT_POL_LOW_OFFSET,
  68 };
  69
  70 #define _IRQ(_irq, _off, _mask, _types)                 \
  71         [_irq] = {                                      \
  72                 .reg_offset = (_off),                   \
  73                 .mask = (_mask),                        \
  74                 .type = {                               \
  75                         .type_reg_offset = (_off),      \
  76                         .types_supported = (_types),    \
  77                 },                                      \
  78         }
  79
  80 static const struct regmap_irq pm8008_irqs[] = {
  81         _IRQ(PM8008_IRQ_MISC_UVLO,    PM8008_MISC,      BIT(0), IRQ_TYPE_EDGE_RISING),
  82         _IRQ(PM8008_IRQ_MISC_OVLO,    PM8008_MISC,      BIT(1), IRQ_TYPE_EDGE_RISING),
  83         _IRQ(PM8008_IRQ_MISC_OTST2,   PM8008_MISC,      BIT(2), IRQ_TYPE_EDGE_RISING),
  84         _IRQ(PM8008_IRQ_MISC_OTST3,   PM8008_MISC,      BIT(3), IRQ_TYPE_EDGE_RISING),
  85         _IRQ(PM8008_IRQ_MISC_LDO_OCP, PM8008_MISC,      BIT(4), IRQ_TYPE_EDGE_RISING),
  86         _IRQ(PM8008_IRQ_TEMP_ALARM,   PM8008_TEMP_ALARM,BIT(0), IRQ_TYPE_SENSE_MASK),
  87         _IRQ(PM8008_IRQ_GPIO1,        PM8008_GPIO1,     BIT(0), IRQ_TYPE_SENSE_MASK),
  88         _IRQ(PM8008_IRQ_GPIO2,        PM8008_GPIO2,     BIT(0), IRQ_TYPE_SENSE_MASK),
  89 };
  90
  91 static const unsigned int pm8008_periph_base[] = {
  92         PM8008_PERIPH_0_BASE,
  93         PM8008_PERIPH_1_BASE,
  94         PM8008_PERIPH_2_BASE,
  95         PM8008_PERIPH_3_BASE,
  96 };
  97
  98 static unsigned int pm8008_get_irq_reg(struct regmap_irq_chip_data *data,
  99                                        unsigned int base, int index)
 100 {
 101         /* Simple linear addressing for the main status register */
 102         if (base == I2C_INTR_STATUS_BASE)
 103                 return base + index;
 104
 105         return pm8008_periph_base[index] + base;
 106 }
 107
 108 static int pm8008_set_type_config(unsigned int **buf, unsigned int type,
 109                                   const struct regmap_irq *irq_data, int idx,
 110                                   void *irq_drv_data)
 111 {
 112         switch (type) {
 113         case IRQ_TYPE_EDGE_FALLING:
 114         case IRQ_TYPE_LEVEL_LOW:
 115                 buf[POLARITY_HI_INDEX][idx] &= ~irq_data->mask;
 116                 buf[POLARITY_LO_INDEX][idx] |= irq_data->mask;
 117                 break;
 118
 119         case IRQ_TYPE_EDGE_RISING:
 120         case IRQ_TYPE_LEVEL_HIGH:
 121                 buf[POLARITY_HI_INDEX][idx] |= irq_data->mask;
 122                 buf[POLARITY_LO_INDEX][idx] &= ~irq_data->mask;
 123                 break;
 124
 125         case IRQ_TYPE_EDGE_BOTH:
 126                 buf[POLARITY_HI_INDEX][idx] |= irq_data->mask;
 127                 buf[POLARITY_LO_INDEX][idx] |= irq_data->mask;
 128                 break;
 129
 130         default:
 131                 return -EINVAL;
 132         }
 133
 134         if (type & IRQ_TYPE_EDGE_BOTH)
 135                 buf[SET_TYPE_INDEX][idx] |= irq_data->mask;
 136         else
 137                 buf[SET_TYPE_INDEX][idx] &= ~irq_data->mask;
 138
 139         return 0;
 140 }
 141
 142 static const struct regmap_irq_chip pm8008_irq_chip = {
 143         .name                   = "pm8008",
 144         .main_status            = I2C_INTR_STATUS_BASE,
 145         .num_main_regs          = 1,
 146         .irqs                   = pm8008_irqs,
 147         .num_irqs               = ARRAY_SIZE(pm8008_irqs),
 148         .num_regs               = PM8008_NUM_PERIPHS,
 149         .status_base            = INT_LATCHED_STS_OFFSET,
 150         .mask_base              = INT_EN_CLR_OFFSET,
 151         .unmask_base            = INT_EN_SET_OFFSET,
 152         .mask_unmask_non_inverted = true,
 153         .ack_base               = INT_LATCHED_CLR_OFFSET,
 154         .config_base            = pm8008_config_regs,
 155         .num_config_bases       = ARRAY_SIZE(pm8008_config_regs),
 156         .num_config_regs        = PM8008_NUM_PERIPHS,
 157         .set_type_config        = pm8008_set_type_config,
 158         .get_irq_reg            = pm8008_get_irq_reg,
 159 };
 160
 161 static const struct regmap_config qcom_mfd_regmap_cfg = {
 162         .name           = "primary",
 163         .reg_bits       = 16,
 164         .val_bits       = 8,
 165         .max_register   = 0xffff,
 166 };
 167
 168 static const struct regmap_config pm8008_regmap_cfg_2 = {
 169         .name           = "secondary",
 170         .reg_bits       = 16,
 171         .val_bits       = 8,
 172         .max_register   = 0xffff,
 173 };
 174
 175 static const struct resource pm8008_temp_res[] = {
 176         DEFINE_RES_MEM(PM8008_TEMP_ALARM_ADDR, 0x100),
 177         DEFINE_RES_IRQ(PM8008_IRQ_TEMP_ALARM),
 178 };
 179
 180 static const struct mfd_cell pm8008_cells[] = {
 181         MFD_CELL_NAME("pm8008-regulator"),
 182         MFD_CELL_RES("qpnp-temp-alarm", pm8008_temp_res),
 183         MFD_CELL_NAME("pm8008-gpio"),
 184 };
 185
 186 static void devm_irq_domain_fwnode_release(void *data)
 187 {
 188         struct fwnode_handle *fwnode = data;
 189
 190         irq_domain_free_fwnode(fwnode);
 191 }
 192
 193 static int pm8008_probe(struct i2c_client *client)
 194 {
 195         struct regmap_irq_chip_data *irq_data;
 196         struct device *dev = &client->dev;
 197         struct regmap *regmap, *regmap2;
 198         struct fwnode_handle *fwnode;
 199         struct i2c_client *dummy;
 200         struct gpio_desc *reset;
 201         char *name;
 202         int ret;
 203
 204         dummy = devm_i2c_new_dummy_device(dev, client->adapter, client->addr + 1);
 205         if (IS_ERR(dummy)) {
 206                 ret = PTR_ERR(dummy);
 207                 dev_err(dev, "failed to claim second address: %d\n", ret);
 208                 return ret;
 209         }
 210
 211         regmap2 = devm_regmap_init_i2c(dummy, &qcom_mfd_regmap_cfg);
 212         if (IS_ERR(regmap2))
 213                 return PTR_ERR(regmap2);
 214
 215         ret = regmap_attach_dev(dev, regmap2, &pm8008_regmap_cfg_2);
 216         if (ret)
 217                 return ret;
 218
 219         /* Default regmap must be attached last. */
 220         regmap = devm_regmap_init_i2c(client, &qcom_mfd_regmap_cfg);
 221         if (IS_ERR(regmap))
 222                 return PTR_ERR(regmap);
 223
 224         reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
 225         if (IS_ERR(reset))
 226                 return PTR_ERR(reset);
 227
 228         /*
 229          * The PMIC does not appear to require a post-reset delay, but wait
 230          * for a millisecond for now anyway.
 231          */
 232         usleep_range(1000, 2000);
 233
 234         name = devm_kasprintf(dev, GFP_KERNEL, "%pOF-internal", dev->of_node);
 235         if (!name)
 236                 return -ENOMEM;
 237
 238         name = strreplace(name, '/', ':');
 239
 240         fwnode = irq_domain_alloc_named_fwnode(name);
 241         if (!fwnode)
 242                 return -ENOMEM;
 243
 244         ret = devm_add_action_or_reset(dev, devm_irq_domain_fwnode_release, fwnode);
 245         if (ret)
 246                 return ret;
 247
 248         ret = devm_regmap_add_irq_chip_fwnode(dev, fwnode, regmap, client->irq,
 249                                 IRQF_SHARED, 0, &pm8008_irq_chip, &irq_data);
 250         if (ret) {
 251                 dev_err(dev, "failed to add IRQ chip: %d\n", ret);
 252                 return ret;
 253         }
 254
 255         /* Needed by GPIO driver. */
 256         dev_set_drvdata(dev, regmap_irq_get_domain(irq_data));
 257
 258         return devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, pm8008_cells,
 259                                 ARRAY_SIZE(pm8008_cells), NULL, 0,
 260                                 regmap_irq_get_domain(irq_data));
 261 }
 262
 263 static const struct of_device_id pm8008_match[] = {
 264         { .compatible = "qcom,pm8008", },
 265         { },
 266 };
 267 MODULE_DEVICE_TABLE(of, pm8008_match);
 268
 269 static struct i2c_driver pm8008_mfd_driver = {
 270         .driver = {
 271                 .name = "pm8008",
 272                 .of_match_table = pm8008_match,
 273         },
 274         .probe = pm8008_probe,
 275 };
 276 module_i2c_driver(pm8008_mfd_driver);
 277
 278 MODULE_DESCRIPTION("QCOM PM8008 Power Management IC driver");
 279 MODULE_LICENSE("GPL v2");