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"); 163