Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
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linux
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/gpio/generic.h>
9#include <linux/err.h>
10#include <linux/io.h>
11#include <linux/mfd/core.h>
12#include <linux/module.h>
13#include <linux/of_platform.h>
14#include <linux/platform_device.h>
15#include <linux/property.h>
16#include <linux/slab.h>
17#include <linux/stat.h>
18
19#define SYS_ID 0x000
20#define SYS_SW 0x004
21#define SYS_LED 0x008
22#define SYS_100HZ 0x024
23#define SYS_FLAGSSET 0x030
24#define SYS_FLAGSCLR 0x034
25#define SYS_NVFLAGS 0x038
26#define SYS_NVFLAGSSET 0x038
27#define SYS_NVFLAGSCLR 0x03c
28#define SYS_MCI 0x048
29#define SYS_FLASH 0x04c
30#define SYS_CFGSW 0x058
31#define SYS_24MHZ 0x05c
32#define SYS_MISC 0x060
33#define SYS_DMA 0x064
34#define SYS_PROCID0 0x084
35#define SYS_PROCID1 0x088
36#define SYS_CFGDATA 0x0a0
37#define SYS_CFGCTRL 0x0a4
38#define SYS_CFGSTAT 0x0a8
39
40/* The sysreg block is just a random collection of various functions... */
41
42static const struct property_entry vexpress_sysreg_sys_led_props[] = {
43 PROPERTY_ENTRY_STRING("label", "sys_led"),
44 PROPERTY_ENTRY_U32("ngpios", 8),
45 { }
46};
47
48static const struct software_node vexpress_sysreg_sys_led_swnode = {
49 .properties = vexpress_sysreg_sys_led_props,
50};
51
52static const struct property_entry vexpress_sysreg_sys_mci_props[] = {
53 PROPERTY_ENTRY_STRING("label", "sys_mci"),
54 PROPERTY_ENTRY_U32("ngpios", 2),
55 { }
56};
57
58static const struct software_node vexpress_sysreg_sys_mci_swnode = {
59 .properties = vexpress_sysreg_sys_mci_props,
60};
61
62static const struct property_entry vexpress_sysreg_sys_flash_props[] = {
63 PROPERTY_ENTRY_STRING("label", "sys_flash"),
64 PROPERTY_ENTRY_U32("ngpios", 1),
65 { }
66};
67
68static const struct software_node vexpress_sysreg_sys_flash_swnode = {
69 .properties = vexpress_sysreg_sys_flash_props,
70};
71
72static struct mfd_cell vexpress_sysreg_cells[] = {
73 {
74 .name = "basic-mmio-gpio",
75 .of_compatible = "arm,vexpress-sysreg,sys_led",
76 .num_resources = 1,
77 .resources = &DEFINE_RES_MEM_NAMED(SYS_LED, 0x4, "dat"),
78 .swnode = &vexpress_sysreg_sys_led_swnode,
79 }, {
80 .name = "basic-mmio-gpio",
81 .of_compatible = "arm,vexpress-sysreg,sys_mci",
82 .num_resources = 1,
83 .resources = &DEFINE_RES_MEM_NAMED(SYS_MCI, 0x4, "dat"),
84 .swnode = &vexpress_sysreg_sys_mci_swnode,
85 }, {
86 .name = "basic-mmio-gpio",
87 .of_compatible = "arm,vexpress-sysreg,sys_flash",
88 .num_resources = 1,
89 .resources = &DEFINE_RES_MEM_NAMED(SYS_FLASH, 0x4, "dat"),
90 .swnode = &vexpress_sysreg_sys_flash_swnode,
91 }, {
92 .name = "vexpress-syscfg",
93 .num_resources = 1,
94 .resources = &DEFINE_RES_MEM(SYS_MISC, 0x4c),
95 }
96};
97
98static int vexpress_sysreg_probe(struct platform_device *pdev)
99{
100 struct gpio_generic_chip *mmc_gpio_chip;
101 struct gpio_generic_chip_config config;
102 struct resource *mem;
103 void __iomem *base;
104 int ret;
105
106 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
107 if (!mem)
108 return -EINVAL;
109
110 base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
111 if (!base)
112 return -ENOMEM;
113
114 /*
115 * Duplicated SYS_MCI pseudo-GPIO controller for compatibility with
116 * older trees using sysreg node for MMC control lines.
117 */
118 mmc_gpio_chip = devm_kzalloc(&pdev->dev, sizeof(*mmc_gpio_chip),
119 GFP_KERNEL);
120 if (!mmc_gpio_chip)
121 return -ENOMEM;
122
123 config = (struct gpio_generic_chip_config) {
124 .dev = &pdev->dev,
125 .sz = 4,
126 .dat = base + SYS_MCI,
127 };
128
129 ret = gpio_generic_chip_init(mmc_gpio_chip, &config);
130 if (ret)
131 return ret;
132
133 mmc_gpio_chip->gc.ngpio = 2;
134
135 ret = devm_gpiochip_add_data(&pdev->dev, &mmc_gpio_chip->gc, NULL);
136 if (ret)
137 return ret;
138
139 return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO,
140 vexpress_sysreg_cells,
141 ARRAY_SIZE(vexpress_sysreg_cells), mem, 0, NULL);
142}
143
144static const struct of_device_id vexpress_sysreg_match[] = {
145 { .compatible = "arm,vexpress-sysreg", },
146 {},
147};
148MODULE_DEVICE_TABLE(of, vexpress_sysreg_match);
149
150static struct platform_driver vexpress_sysreg_driver = {
151 .driver = {
152 .name = "vexpress-sysreg",
153 .of_match_table = vexpress_sysreg_match,
154 },
155 .probe = vexpress_sysreg_probe,
156};
157
158module_platform_driver(vexpress_sysreg_driver);
159MODULE_DESCRIPTION("Versatile Express system registers driver");
160MODULE_LICENSE("GPL v2");