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 = &DEFINE_RES_MEM_NAMED(SYS_LED, 0x4, "dat"),
65		.platform_data = &vexpress_sysreg_sys_led_pdata,
66		.pdata_size = sizeof(vexpress_sysreg_sys_led_pdata),
67	}, {
68		.name = "basic-mmio-gpio",
69		.of_compatible = "arm,vexpress-sysreg,sys_mci",
70		.num_resources = 1,
71		.resources = &DEFINE_RES_MEM_NAMED(SYS_MCI, 0x4, "dat"),
72		.platform_data = &vexpress_sysreg_sys_mci_pdata,
73		.pdata_size = sizeof(vexpress_sysreg_sys_mci_pdata),
74	}, {
75		.name = "basic-mmio-gpio",
76		.of_compatible = "arm,vexpress-sysreg,sys_flash",
77		.num_resources = 1,
78		.resources = &DEFINE_RES_MEM_NAMED(SYS_FLASH, 0x4, "dat"),
79		.platform_data = &vexpress_sysreg_sys_flash_pdata,
80		.pdata_size = sizeof(vexpress_sysreg_sys_flash_pdata),
81	}, {
82		.name = "vexpress-syscfg",
83		.num_resources = 1,
84		.resources = &DEFINE_RES_MEM(SYS_MISC, 0x4c),
85	}
86};
87
88static int vexpress_sysreg_probe(struct platform_device *pdev)
89{
90	struct resource *mem;
91	void __iomem *base;
92	struct gpio_chip *mmc_gpio_chip;
93
94	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
95	if (!mem)
96		return -EINVAL;
97
98	base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
99	if (!base)
100		return -ENOMEM;
101
102	/*
103	 * Duplicated SYS_MCI pseudo-GPIO controller for compatibility with
104	 * older trees using sysreg node for MMC control lines.
105	 */
106	mmc_gpio_chip = devm_kzalloc(&pdev->dev, sizeof(*mmc_gpio_chip),
107			GFP_KERNEL);
108	if (!mmc_gpio_chip)
109		return -ENOMEM;
110	bgpio_init(mmc_gpio_chip, &pdev->dev, 0x4, base + SYS_MCI,
111			NULL, NULL, NULL, NULL, 0);
112	mmc_gpio_chip->ngpio = 2;
113	devm_gpiochip_add_data(&pdev->dev, mmc_gpio_chip, NULL);
114
115	return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO,
116			vexpress_sysreg_cells,
117			ARRAY_SIZE(vexpress_sysreg_cells), mem, 0, NULL);
118}
119
120static const struct of_device_id vexpress_sysreg_match[] = {
121	{ .compatible = "arm,vexpress-sysreg", },
122	{},
123};
124MODULE_DEVICE_TABLE(of, vexpress_sysreg_match);
125
126static struct platform_driver vexpress_sysreg_driver = {
127	.driver = {
128		.name = "vexpress-sysreg",
129		.of_match_table = vexpress_sysreg_match,
130	},
131	.probe = vexpress_sysreg_probe,
132};
133
134module_platform_driver(vexpress_sysreg_driver);
135MODULE_LICENSE("GPL v2");
136