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 mfd_cell hi655x_pmic_devs[] = {
  28         { .name = "hi655x-regulator", },
  29 };
  30
  31 static const struct regmap_irq hi655x_irqs[] = {
  32         { .reg_offset = 0, .mask = OTMP_D1R_INT_MASK },
  33         { .reg_offset = 0, .mask = VSYS_2P5_R_INT_MASK },
  34         { .reg_offset = 0, .mask = VSYS_UV_D3R_INT_MASK },
  35         { .reg_offset = 0, .mask = VSYS_6P0_D200UR_INT_MASK },
  36         { .reg_offset = 0, .mask = PWRON_D4SR_INT_MASK },
  37         { .reg_offset = 0, .mask = PWRON_D20F_INT_MASK },
  38         { .reg_offset = 0, .mask = PWRON_D20R_INT_MASK },
  39         { .reg_offset = 0, .mask = RESERVE_INT_MASK },
  40 };
  41
  42 static const struct regmap_irq_chip hi655x_irq_chip = {
  43         .name = "hi655x-pmic",
  44         .irqs = hi655x_irqs,
  45         .num_regs = 1,
  46         .num_irqs = ARRAY_SIZE(hi655x_irqs),
  47         .status_base = HI655X_IRQ_STAT_BASE,
  48         .ack_base = HI655X_IRQ_STAT_BASE,
  49         .mask_base = HI655X_IRQ_MASK_BASE,
  50 };
  51
  52 static struct regmap_config hi655x_regmap_config = {
  53         .reg_bits = 32,
  54         .reg_stride = HI655X_STRIDE,
  55         .val_bits = 8,
  56         .max_register = HI655X_BUS_ADDR(0xFFF),
  57 };
  58
  59 static void hi655x_local_irq_clear(struct regmap *map)
  60 {
  61         int i;
  62
  63         regmap_write(map, HI655X_ANA_IRQM_BASE, HI655X_IRQ_CLR);
  64         for (i = 0; i < HI655X_IRQ_ARRAY; i++) {
  65                 regmap_write(map, HI655X_IRQ_STAT_BASE + i * HI655X_STRIDE,
  66                              HI655X_IRQ_CLR);
  67         }
  68 }
  69
  70 static int hi655x_pmic_probe(struct platform_device *pdev)
  71 {
  72         int ret;
  73         struct hi655x_pmic *pmic;
  74         struct device *dev = &pdev->dev;
  75         struct device_node *np = dev->of_node;
  76         void __iomem *base;
  77
  78         pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
  79         if (!pmic)
  80                 return -ENOMEM;
  81         pmic->dev = dev;
  82
  83         pmic->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  84         if (!pmic->res)
  85                 return -ENOENT;
  86
  87         base = devm_ioremap_resource(dev, pmic->res);
  88         if (!base)
  89                 return -ENOMEM;
  90
  91         pmic->regmap = devm_regmap_init_mmio_clk(dev, NULL, base,
  92                                                  &hi655x_regmap_config);
  93
  94         regmap_read(pmic->regmap, HI655X_BUS_ADDR(HI655X_VER_REG), &pmic->ver);
  95         if ((pmic->ver < PMU_VER_START) || (pmic->ver > PMU_VER_END)) {
  96                 dev_warn(dev, "PMU version %d unsupported\n", pmic->ver);
  97                 return -EINVAL;
  98         }
  99
 100         hi655x_local_irq_clear(pmic->regmap);
 101
 102         pmic->gpio = of_get_named_gpio(np, "pmic-gpios", 0);
 103         if (!gpio_is_valid(pmic->gpio)) {
 104                 dev_err(dev, "Failed to get the pmic-gpios\n");
 105                 return -ENODEV;
 106         }
 107
 108         ret = devm_gpio_request_one(dev, pmic->gpio, GPIOF_IN,
 109                                     "hi655x_pmic_irq");
 110         if (ret < 0) {
 111                 dev_err(dev, "Failed to request gpio %d  ret = %d\n",
 112                         pmic->gpio, ret);
 113                 return ret;
 114         }
 115
 116         ret = regmap_add_irq_chip(pmic->regmap, gpio_to_irq(pmic->gpio),
 117                                   IRQF_TRIGGER_LOW | IRQF_NO_SUSPEND, 0,
 118                                   &hi655x_irq_chip, &pmic->irq_data);
 119         if (ret) {
 120                 dev_err(dev, "Failed to obtain 'hi655x_pmic_irq' %d\n", ret);
 121                 return ret;
 122         }
 123
 124         platform_set_drvdata(pdev, pmic);
 125
 126         ret = mfd_add_devices(dev, PLATFORM_DEVID_AUTO, hi655x_pmic_devs,
 127                               ARRAY_SIZE(hi655x_pmic_devs), NULL, 0, NULL);
 128         if (ret) {
 129                 dev_err(dev, "Failed to register device %d\n", ret);
 130                 regmap_del_irq_chip(gpio_to_irq(pmic->gpio), pmic->irq_data);
 131                 return ret;
 132         }
 133
 134         return 0;
 135 }
 136
 137 static int hi655x_pmic_remove(struct platform_device *pdev)
 138 {
 139         struct hi655x_pmic *pmic = platform_get_drvdata(pdev);
 140
 141         regmap_del_irq_chip(gpio_to_irq(pmic->gpio), pmic->irq_data);
 142         mfd_remove_devices(&pdev->dev);
 143         return 0;
 144 }
 145
 146 static const struct of_device_id hi655x_pmic_match[] = {
 147         { .compatible = "hisilicon,hi655x-pmic", },
 148         {},
 149 };
 150
 151 static struct platform_driver hi655x_pmic_driver = {
 152         .driver = {
 153                 .name = "hi655x-pmic",
 154                 .of_match_table = of_match_ptr(hi655x_pmic_match),
 155         },
 156         .probe  = hi655x_pmic_probe,
 157         .remove = hi655x_pmic_remove,
 158 };
 159 module_platform_driver(hi655x_pmic_driver);
 160
 161 MODULE_AUTHOR("Chen Feng <puck.chen@hisilicon.com>");
 162 MODULE_DESCRIPTION("Hisilicon hi655x PMIC driver");
 163 MODULE_LICENSE("GPL v2");