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 },
  33         { .reg_offset = 0, .mask = VSYS_2P5_R_INT },
  34         { .reg_offset = 0, .mask = VSYS_UV_D3R_INT },
  35         { .reg_offset = 0, .mask = VSYS_6P0_D200UR_INT },
  36         { .reg_offset = 0, .mask = PWRON_D4SR_INT },
  37         { .reg_offset = 0, .mask = PWRON_D20F_INT },
  38         { .reg_offset = 0, .mask = PWRON_D20R_INT },
  39         { .reg_offset = 0, .mask = RESERVE_INT },
  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         .mask_base = HI655X_IRQ_MASK_BASE,
  49 };
  50
  51 static struct regmap_config hi655x_regmap_config = {
  52         .reg_bits = 32,
  53         .reg_stride = HI655X_STRIDE,
  54         .val_bits = 8,
  55         .max_register = HI655X_BUS_ADDR(0xFFF),
  56 };
  57
  58 static void hi655x_local_irq_clear(struct regmap *map)
  59 {
  60         int i;
  61
  62         regmap_write(map, HI655X_ANA_IRQM_BASE, HI655X_IRQ_CLR);
  63         for (i = 0; i < HI655X_IRQ_ARRAY; i++) {
  64                 regmap_write(map, HI655X_IRQ_STAT_BASE + i * HI655X_STRIDE,
  65                              HI655X_IRQ_CLR);
  66         }
  67 }
  68
  69 static int hi655x_pmic_probe(struct platform_device *pdev)
  70 {
  71         int ret;
  72         struct hi655x_pmic *pmic;
  73         struct device *dev = &pdev->dev;
  74         struct device_node *np = dev->of_node;
  75         void __iomem *base;
  76
  77         pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
  78         if (!pmic)
  79                 return -ENOMEM;
  80         pmic->dev = dev;
  81
  82         pmic->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  83         if (!pmic->res)
  84                 return -ENOENT;
  85
  86         base = devm_ioremap_resource(dev, pmic->res);
  87         if (!base)
  88                 return -ENOMEM;
  89
  90         pmic->regmap = devm_regmap_init_mmio_clk(dev, NULL, base,
  91                                                  &hi655x_regmap_config);
  92
  93         regmap_read(pmic->regmap, HI655X_BUS_ADDR(HI655X_VER_REG), &pmic->ver);
  94         if ((pmic->ver < PMU_VER_START) || (pmic->ver > PMU_VER_END)) {
  95                 dev_warn(dev, "PMU version %d unsupported\n", pmic->ver);
  96                 return -EINVAL;
  97         }
  98
  99         hi655x_local_irq_clear(pmic->regmap);
 100
 101         pmic->gpio = of_get_named_gpio(np, "pmic-gpios", 0);
 102         if (!gpio_is_valid(pmic->gpio)) {
 103                 dev_err(dev, "Failed to get the pmic-gpios\n");
 104                 return -ENODEV;
 105         }
 106
 107         ret = devm_gpio_request_one(dev, pmic->gpio, GPIOF_IN,
 108                                     "hi655x_pmic_irq");
 109         if (ret < 0) {
 110                 dev_err(dev, "Failed to request gpio %d  ret = %d\n",
 111                         pmic->gpio, ret);
 112                 return ret;
 113         }
 114
 115         ret = regmap_add_irq_chip(pmic->regmap, gpio_to_irq(pmic->gpio),
 116                                   IRQF_TRIGGER_LOW | IRQF_NO_SUSPEND, 0,
 117                                   &hi655x_irq_chip, &pmic->irq_data);
 118         if (ret) {
 119                 dev_err(dev, "Failed to obtain 'hi655x_pmic_irq' %d\n", ret);
 120                 return ret;
 121         }
 122
 123         platform_set_drvdata(pdev, pmic);
 124
 125         ret = mfd_add_devices(dev, PLATFORM_DEVID_AUTO, hi655x_pmic_devs,
 126                               ARRAY_SIZE(hi655x_pmic_devs), NULL, 0, NULL);
 127         if (ret) {
 128                 dev_err(dev, "Failed to register device %d\n", ret);
 129                 regmap_del_irq_chip(gpio_to_irq(pmic->gpio), pmic->irq_data);
 130                 return ret;
 131         }
 132
 133         return 0;
 134 }
 135
 136 static int hi655x_pmic_remove(struct platform_device *pdev)
 137 {
 138         struct hi655x_pmic *pmic = platform_get_drvdata(pdev);
 139
 140         regmap_del_irq_chip(gpio_to_irq(pmic->gpio), pmic->irq_data);
 141         mfd_remove_devices(&pdev->dev);
 142         return 0;
 143 }
 144
 145 static const struct of_device_id hi655x_pmic_match[] = {
 146         { .compatible = "hisilicon,hi655x-pmic", },
 147         {},
 148 };
 149
 150 static struct platform_driver hi655x_pmic_driver = {
 151         .driver = {
 152                 .name = "hi655x-pmic",
 153                 .of_match_table = of_match_ptr(hi655x_pmic_match),
 154         },
 155         .probe  = hi655x_pmic_probe,
 156         .remove = hi655x_pmic_remove,
 157 };
 158 module_platform_driver(hi655x_pmic_driver);
 159
 160 MODULE_AUTHOR("Chen Feng <puck.chen@hisilicon.com>");
 161 MODULE_DESCRIPTION("Hisilicon hi655x PMIC driver");
 162 MODULE_LICENSE("GPL v2");