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
 27static 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
 38static 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
 48static 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
 55static 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
 74static 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
 83static 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
 94static 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
159static 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
168static const struct of_device_id hi655x_pmic_match[] = {
169	{ .compatible = "hisilicon,hi655x-pmic", },
170	{},
171};
172MODULE_DEVICE_TABLE(of, hi655x_pmic_match);
173
174static struct platform_driver hi655x_pmic_driver = {
175	.driver	= {
176		.name =	"hi655x-pmic",
177		.of_match_table = of_match_ptr(hi655x_pmic_match),
178	},
179	.probe  = hi655x_pmic_probe,
180	.remove = hi655x_pmic_remove,
181};
182module_platform_driver(hi655x_pmic_driver);
183
184MODULE_AUTHOR("Chen Feng <puck.chen@hisilicon.com>");
185MODULE_DESCRIPTION("Hisilicon hi655x PMIC driver");
186MODULE_LICENSE("GPL v2");