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 
41 static struct bgpio_pdata vexpress_sysreg_sys_led_pdata = {
42 	.label = "sys_led",
43 	.base = -1,
44 	.ngpio = 8,
45 };
46 
47 static struct bgpio_pdata vexpress_sysreg_sys_mci_pdata = {
48 	.label = "sys_mci",
49 	.base = -1,
50 	.ngpio = 2,
51 };
52 
53 static struct bgpio_pdata vexpress_sysreg_sys_flash_pdata = {
54 	.label = "sys_flash",
55 	.base = -1,
56 	.ngpio = 1,
57 };
58 
59 static 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 
vexpress_sysreg_probe(struct platform_device * pdev)96 static 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 
128 static const struct of_device_id vexpress_sysreg_match[] = {
129 	{ .compatible = "arm,vexpress-sysreg", },
130 	{},
131 };
132 MODULE_DEVICE_TABLE(of, vexpress_sysreg_match);
133 
134 static 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 
142 module_platform_driver(vexpress_sysreg_driver);
143 MODULE_LICENSE("GPL v2");
144