1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Device driver for MFD hi655x PMIC
  4 *
  5 * Copyright (c) 2016 HiSilicon Ltd.
  6 *
  7 * Authors:
  8 * Chen Feng <puck.chen@hisilicon.com>
  9 * Fei  Wang <w.f@huawei.com>
 10 */
 11
 12#include <linux/io.h>
 13#include <linux/interrupt.h>
 14#include <linux/init.h>
 15#include <linux/mfd/core.h>
 16#include <linux/mfd/hi655x-pmic.h>
 17#include <linux/module.h>
 18#include <linux/gpio/consumer.h>
 19#include <linux/mod_devicetable.h>
 20#include <linux/platform_device.h>
 21#include <linux/regmap.h>
 22
 23static const struct regmap_irq hi655x_irqs[] = {
 24	{ .reg_offset = 0, .mask = OTMP_D1R_INT_MASK },
 25	{ .reg_offset = 0, .mask = VSYS_2P5_R_INT_MASK },
 26	{ .reg_offset = 0, .mask = VSYS_UV_D3R_INT_MASK },
 27	{ .reg_offset = 0, .mask = VSYS_6P0_D200UR_INT_MASK },
 28	{ .reg_offset = 0, .mask = PWRON_D4SR_INT_MASK },
 29	{ .reg_offset = 0, .mask = PWRON_D20F_INT_MASK },
 30	{ .reg_offset = 0, .mask = PWRON_D20R_INT_MASK },
 31	{ .reg_offset = 0, .mask = RESERVE_INT_MASK },
 32};
 33
 34static const struct regmap_irq_chip hi655x_irq_chip = {
 35	.name = "hi655x-pmic",
 36	.irqs = hi655x_irqs,
 37	.num_regs = 1,
 38	.num_irqs = ARRAY_SIZE(hi655x_irqs),
 39	.status_base = HI655X_IRQ_STAT_BASE,
 40	.ack_base = HI655X_IRQ_STAT_BASE,
 41	.mask_base = HI655X_IRQ_MASK_BASE,
 42};
 43
 44static struct regmap_config hi655x_regmap_config = {
 45	.reg_bits = 32,
 46	.reg_stride = HI655X_STRIDE,
 47	.val_bits = 8,
 48	.max_register = HI655X_BUS_ADDR(0x400) - HI655X_STRIDE,
 49};
 50
 51static const struct resource pwrkey_resources[] = {
 52	{
 53		.name	= "down",
 54		.start	= PWRON_D20R_INT,
 55		.end	= PWRON_D20R_INT,
 56		.flags	= IORESOURCE_IRQ,
 57	}, {
 58		.name	= "up",
 59		.start	= PWRON_D20F_INT,
 60		.end	= PWRON_D20F_INT,
 61		.flags	= IORESOURCE_IRQ,
 62	}, {
 63		.name	= "hold 4s",
 64		.start	= PWRON_D4SR_INT,
 65		.end	= PWRON_D4SR_INT,
 66		.flags	= IORESOURCE_IRQ,
 67	},
 68};
 69
 70static const struct mfd_cell hi655x_pmic_devs[] = {
 71	{
 72		.name		= "hi65xx-powerkey",
 73		.num_resources	= ARRAY_SIZE(pwrkey_resources),
 74		.resources	= &pwrkey_resources[0],
 75	},
 76	{	.name		= "hi655x-regulator",	},
 77	{	.name		= "hi655x-clk",		},
 78};
 79
 80static void hi655x_local_irq_clear(struct regmap *map)
 81{
 82	int i;
 83
 84	regmap_write(map, HI655X_ANA_IRQM_BASE, HI655X_IRQ_CLR);
 85	for (i = 0; i < HI655X_IRQ_ARRAY; i++) {
 86		regmap_write(map, HI655X_IRQ_STAT_BASE + i * HI655X_STRIDE,
 87			     HI655X_IRQ_CLR);
 88	}
 89}
 90
 91static int hi655x_pmic_probe(struct platform_device *pdev)
 92{
 93	int ret;
 94	struct hi655x_pmic *pmic;
 95	struct device *dev = &pdev->dev;
 96	void __iomem *base;
 97
 98	pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
 99	if (!pmic)
100		return -ENOMEM;
101	pmic->dev = dev;
102
103	base = devm_platform_ioremap_resource(pdev, 0);
104	if (IS_ERR(base))
105		return PTR_ERR(base);
106
107	pmic->regmap = devm_regmap_init_mmio_clk(dev, NULL, base,
108						 &hi655x_regmap_config);
109	if (IS_ERR(pmic->regmap))
110		return PTR_ERR(pmic->regmap);
111
112	regmap_read(pmic->regmap, HI655X_BUS_ADDR(HI655X_VER_REG), &pmic->ver);
113	if ((pmic->ver < PMU_VER_START) || (pmic->ver > PMU_VER_END)) {
114		dev_warn(dev, "PMU version %d unsupported\n", pmic->ver);
115		return -EINVAL;
116	}
117
118	hi655x_local_irq_clear(pmic->regmap);
119
120	pmic->gpio = devm_gpiod_get_optional(dev, "pmic", GPIOD_IN);
121	if (IS_ERR(pmic->gpio))
122		return dev_err_probe(dev, PTR_ERR(pmic->gpio),
123				"Failed to request hi655x pmic-gpio");
124
125	ret = regmap_add_irq_chip(pmic->regmap, gpiod_to_irq(pmic->gpio),
126				  IRQF_TRIGGER_LOW | IRQF_NO_SUSPEND, 0,
127				  &hi655x_irq_chip, &pmic->irq_data);
128	if (ret) {
129		dev_err(dev, "Failed to obtain 'hi655x_pmic_irq' %d\n", ret);
130		return ret;
131	}
132
133	platform_set_drvdata(pdev, pmic);
134
135	ret = mfd_add_devices(dev, PLATFORM_DEVID_AUTO, hi655x_pmic_devs,
136			      ARRAY_SIZE(hi655x_pmic_devs), NULL, 0,
137			      regmap_irq_get_domain(pmic->irq_data));
138	if (ret) {
139		dev_err(dev, "Failed to register device %d\n", ret);
140		regmap_del_irq_chip(gpiod_to_irq(pmic->gpio), pmic->irq_data);
141		return ret;
142	}
143
144	return 0;
145}
146
147static void hi655x_pmic_remove(struct platform_device *pdev)
148{
149	struct hi655x_pmic *pmic = platform_get_drvdata(pdev);
150
151	regmap_del_irq_chip(gpiod_to_irq(pmic->gpio), pmic->irq_data);
152	mfd_remove_devices(&pdev->dev);
153}
154
155static const struct of_device_id hi655x_pmic_match[] = {
156	{ .compatible = "hisilicon,hi655x-pmic", },
157	{},
158};
159MODULE_DEVICE_TABLE(of, hi655x_pmic_match);
160
161static struct platform_driver hi655x_pmic_driver = {
162	.driver	= {
163		.name =	"hi655x-pmic",
164		.of_match_table = hi655x_pmic_match,
165	},
166	.probe  = hi655x_pmic_probe,
167	.remove_new = hi655x_pmic_remove,
168};
169module_platform_driver(hi655x_pmic_driver);
170
171MODULE_AUTHOR("Chen Feng <puck.chen@hisilicon.com>");
172MODULE_DESCRIPTION("Hisilicon hi655x PMIC driver");
173MODULE_LICENSE("GPL v2");