1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 *
  4 * Copyright (C) 2012 ARM Limited
  5 */
  6
  7#include <linux/gpio/driver.h>
  8#include <linux/err.h>
  9#include <linux/io.h>
 10#include <linux/mfd/core.h>
 11#include <linux/module.h>
 12#include <linux/of_platform.h>
 13#include <linux/platform_data/syscon.h>
 14#include <linux/platform_device.h>
 15#include <linux/slab.h>
 16#include <linux/stat.h>
 17
 18#define SYS_ID			0x000
 19#define SYS_SW			0x004
 20#define SYS_LED			0x008
 21#define SYS_100HZ		0x024
 22#define SYS_FLAGSSET		0x030
 23#define SYS_FLAGSCLR		0x034
 24#define SYS_NVFLAGS		0x038
 25#define SYS_NVFLAGSSET		0x038
 26#define SYS_NVFLAGSCLR		0x03c
 27#define SYS_MCI			0x048
 28#define SYS_FLASH		0x04c
 29#define SYS_CFGSW		0x058
 30#define SYS_24MHZ		0x05c
 31#define SYS_MISC		0x060
 32#define SYS_DMA			0x064
 33#define SYS_PROCID0		0x084
 34#define SYS_PROCID1		0x088
 35#define SYS_CFGDATA		0x0a0
 36#define SYS_CFGCTRL		0x0a4
 37#define SYS_CFGSTAT		0x0a8
 38
 39/* The sysreg block is just a random collection of various functions... */
 40
 41static struct bgpio_pdata vexpress_sysreg_sys_led_pdata = {
 42	.label = "sys_led",
 43	.base = -1,
 44	.ngpio = 8,
 45};
 46
 47static struct bgpio_pdata vexpress_sysreg_sys_mci_pdata = {
 48	.label = "sys_mci",
 49	.base = -1,
 50	.ngpio = 2,
 51};
 52
 53static struct bgpio_pdata vexpress_sysreg_sys_flash_pdata = {
 54	.label = "sys_flash",
 55	.base = -1,
 56	.ngpio = 1,
 57};
 58
 59static struct mfd_cell vexpress_sysreg_cells[] = {
 60	{
 61		.name = "basic-mmio-gpio",
 62		.of_compatible = "arm,vexpress-sysreg,sys_led",
 63		.num_resources = 1,
 64		.resources = (struct resource []) {
 65			DEFINE_RES_MEM_NAMED(SYS_LED, 0x4, "dat"),
 66		},
 67		.platform_data = &vexpress_sysreg_sys_led_pdata,
 68		.pdata_size = sizeof(vexpress_sysreg_sys_led_pdata),
 69	}, {
 70		.name = "basic-mmio-gpio",
 71		.of_compatible = "arm,vexpress-sysreg,sys_mci",
 72		.num_resources = 1,
 73		.resources = (struct resource []) {
 74			DEFINE_RES_MEM_NAMED(SYS_MCI, 0x4, "dat"),
 75		},
 76		.platform_data = &vexpress_sysreg_sys_mci_pdata,
 77		.pdata_size = sizeof(vexpress_sysreg_sys_mci_pdata),
 78	}, {
 79		.name = "basic-mmio-gpio",
 80		.of_compatible = "arm,vexpress-sysreg,sys_flash",
 81		.num_resources = 1,
 82		.resources = (struct resource []) {
 83			DEFINE_RES_MEM_NAMED(SYS_FLASH, 0x4, "dat"),
 84		},
 85		.platform_data = &vexpress_sysreg_sys_flash_pdata,
 86		.pdata_size = sizeof(vexpress_sysreg_sys_flash_pdata),
 87	}, {
 88		.name = "vexpress-syscfg",
 89		.num_resources = 1,
 90		.resources = (struct resource []) {
 91			DEFINE_RES_MEM(SYS_MISC, 0x4c),
 92		},
 93	}
 94};
 95
 96static int vexpress_sysreg_probe(struct platform_device *pdev)
 97{
 98	struct resource *mem;
 99	void __iomem *base;
100	struct gpio_chip *mmc_gpio_chip;
101
102	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
103	if (!mem)
104		return -EINVAL;
105
106	base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
107	if (!base)
108		return -ENOMEM;
109
110	/*
111	 * Duplicated SYS_MCI pseudo-GPIO controller for compatibility with
112	 * older trees using sysreg node for MMC control lines.
113	 */
114	mmc_gpio_chip = devm_kzalloc(&pdev->dev, sizeof(*mmc_gpio_chip),
115			GFP_KERNEL);
116	if (!mmc_gpio_chip)
117		return -ENOMEM;
118	bgpio_init(mmc_gpio_chip, &pdev->dev, 0x4, base + SYS_MCI,
119			NULL, NULL, NULL, NULL, 0);
120	mmc_gpio_chip->ngpio = 2;
121	devm_gpiochip_add_data(&pdev->dev, mmc_gpio_chip, NULL);
122
123	return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO,
124			vexpress_sysreg_cells,
125			ARRAY_SIZE(vexpress_sysreg_cells), mem, 0, NULL);
126}
127
128static const struct of_device_id vexpress_sysreg_match[] = {
129	{ .compatible = "arm,vexpress-sysreg", },
130	{},
131};
132MODULE_DEVICE_TABLE(of, vexpress_sysreg_match);
133
134static struct platform_driver vexpress_sysreg_driver = {
135	.driver = {
136		.name = "vexpress-sysreg",
137		.of_match_table = vexpress_sysreg_match,
138	},
139	.probe = vexpress_sysreg_probe,
140};
141
142module_platform_driver(vexpress_sysreg_driver);
143MODULE_LICENSE("GPL v2");