drivers/mfd/hi655x-pmic.c

   1 /*
   2  * Device driver for MFD hi655x PMIC
   3  *
   4  * Copyright (c) 2016 Hisilicon.
   5  *
   6  * Authors:
   7  * Chen Feng <puck.chen@hisilicon.com>
   8  * Fei  Wang <w.f@huawei.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/gpio.h>
  16 #include <linux/io.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/init.h>
  19 #include <linux/mfd/core.h>
  20 #include <linux/mfd/hi655x-pmic.h>
  21 #include <linux/module.h>
  22 #include <linux/of_gpio.h>
  23 #include <linux/of_platform.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/regmap.h>
  26
  27 static const struct regmap_irq hi655x_irqs[] = {
  28         { .reg_offset = 0, .mask = OTMP_D1R_INT_MASK },
  29         { .reg_offset = 0, .mask = VSYS_2P5_R_INT_MASK },
  30         { .reg_offset = 0, .mask = VSYS_UV_D3R_INT_MASK },
  31         { .reg_offset = 0, .mask = VSYS_6P0_D200UR_INT_MASK },
  32         { .reg_offset = 0, .mask = PWRON_D4SR_INT_MASK },
  33         { .reg_offset = 0, .mask = PWRON_D20F_INT_MASK },
  34         { .reg_offset = 0, .mask = PWRON_D20R_INT_MASK },
  35         { .reg_offset = 0, .mask = RESERVE_INT_MASK },
  36 };
  37
  38 static const struct regmap_irq_chip hi655x_irq_chip = {
  39         .name = "hi655x-pmic",
  40         .irqs = hi655x_irqs,
  41         .num_regs = 1,
  42         .num_irqs = ARRAY_SIZE(hi655x_irqs),
  43         .status_base = HI655X_IRQ_STAT_BASE,
  44         .ack_base = HI655X_IRQ_STAT_BASE,
  45         .mask_base = HI655X_IRQ_MASK_BASE,
  46 };
  47
  48 static struct regmap_config hi655x_regmap_config = {
  49         .reg_bits = 32,
  50         .reg_stride = HI655X_STRIDE,
  51         .val_bits = 8,
  52         .max_register = HI655X_BUS_ADDR(0xFFF),
  53 };
  54
  55 static struct resource pwrkey_resources[] = {
  56         {
  57                 .name   = "down",
  58                 .start  = PWRON_D20R_INT,
  59                 .end    = PWRON_D20R_INT,
  60                 .flags  = IORESOURCE_IRQ,
  61         }, {
  62                 .name   = "up",
  63                 .start  = PWRON_D20F_INT,
  64                 .end    = PWRON_D20F_INT,
  65                 .flags  = IORESOURCE_IRQ,
  66         }, {
  67                 .name   = "hold 4s",
  68                 .start  = PWRON_D4SR_INT,
  69                 .end    = PWRON_D4SR_INT,
  70                 .flags  = IORESOURCE_IRQ,
  71         },
  72 };
  73
  74 static const struct mfd_cell hi655x_pmic_devs[] = {
  75         {
  76                 .name           = "hi65xx-powerkey",
  77                 .num_resources  = ARRAY_SIZE(pwrkey_resources),
  78                 .resources      = &pwrkey_resources[0],
  79         },
  80         {       .name           = "hi655x-regulator", },
  81 };
  82
  83 static void hi655x_local_irq_clear(struct regmap *map)
  84 {
  85         int i;
  86
  87         regmap_write(map, HI655X_ANA_IRQM_BASE, HI655X_IRQ_CLR);
  88         for (i = 0; i < HI655X_IRQ_ARRAY; i++) {
  89                 regmap_write(map, HI655X_IRQ_STAT_BASE + i * HI655X_STRIDE,
  90                              HI655X_IRQ_CLR);
  91         }
  92 }
  93
  94 static int hi655x_pmic_probe(struct platform_device *pdev)
  95 {
  96         int ret;
  97         struct hi655x_pmic *pmic;
  98         struct device *dev = &pdev->dev;
  99         struct device_node *np = dev->of_node;
 100         void __iomem *base;
 101
 102         pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
 103         if (!pmic)
 104                 return -ENOMEM;
 105         pmic->dev = dev;
 106
 107         pmic->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 108         base = devm_ioremap_resource(dev, pmic->res);
 109         if (IS_ERR(base))
 110                 return PTR_ERR(base);
 111
 112         pmic->regmap = devm_regmap_init_mmio_clk(dev, NULL, base,
 113                                                  &hi655x_regmap_config);
 114
 115         regmap_read(pmic->regmap, HI655X_BUS_ADDR(HI655X_VER_REG), &pmic->ver);
 116         if ((pmic->ver < PMU_VER_START) || (pmic->ver > PMU_VER_END)) {
 117                 dev_warn(dev, "PMU version %d unsupported\n", pmic->ver);
 118                 return -EINVAL;
 119         }
 120
 121         hi655x_local_irq_clear(pmic->regmap);
 122
 123         pmic->gpio = of_get_named_gpio(np, "pmic-gpios", 0);
 124         if (!gpio_is_valid(pmic->gpio)) {
 125                 dev_err(dev, "Failed to get the pmic-gpios\n");
 126                 return -ENODEV;
 127         }
 128
 129         ret = devm_gpio_request_one(dev, pmic->gpio, GPIOF_IN,
 130                                     "hi655x_pmic_irq");
 131         if (ret < 0) {
 132                 dev_err(dev, "Failed to request gpio %d  ret = %d\n",
 133                         pmic->gpio, ret);
 134                 return ret;
 135         }
 136
 137         ret = regmap_add_irq_chip(pmic->regmap, gpio_to_irq(pmic->gpio),
 138                                   IRQF_TRIGGER_LOW | IRQF_NO_SUSPEND, 0,
 139                                   &hi655x_irq_chip, &pmic->irq_data);
 140         if (ret) {
 141                 dev_err(dev, "Failed to obtain 'hi655x_pmic_irq' %d\n", ret);
 142                 return ret;
 143         }
 144
 145         platform_set_drvdata(pdev, pmic);
 146
 147         ret = mfd_add_devices(dev, PLATFORM_DEVID_AUTO, hi655x_pmic_devs,
 148                               ARRAY_SIZE(hi655x_pmic_devs), NULL, 0,
 149                               regmap_irq_get_domain(pmic->irq_data));
 150         if (ret) {
 151                 dev_err(dev, "Failed to register device %d\n", ret);
 152                 regmap_del_irq_chip(gpio_to_irq(pmic->gpio), pmic->irq_data);
 153                 return ret;
 154         }
 155
 156         return 0;
 157 }
 158
 159 static int hi655x_pmic_remove(struct platform_device *pdev)
 160 {
 161         struct hi655x_pmic *pmic = platform_get_drvdata(pdev);
 162
 163         regmap_del_irq_chip(gpio_to_irq(pmic->gpio), pmic->irq_data);
 164         mfd_remove_devices(&pdev->dev);
 165         return 0;
 166 }
 167
 168 static const struct of_device_id hi655x_pmic_match[] = {
 169         { .compatible = "hisilicon,hi655x-pmic", },
 170         {},
 171 };
 172
 173 static struct platform_driver hi655x_pmic_driver = {
 174         .driver = {
 175                 .name = "hi655x-pmic",
 176                 .of_match_table = of_match_ptr(hi655x_pmic_match),
 177         },
 178         .probe  = hi655x_pmic_probe,
 179         .remove = hi655x_pmic_remove,
 180 };
 181 module_platform_driver(hi655x_pmic_driver);
 182
 183 MODULE_AUTHOR("Chen Feng <puck.chen@hisilicon.com>");
 184 MODULE_DESCRIPTION("Hisilicon hi655x PMIC driver");
 185 MODULE_LICENSE("GPL v2");