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 = &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
vexpress_sysreg_probe(struct platform_device * pdev)88 static 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
120 static const struct of_device_id vexpress_sysreg_match[] = {
121 { .compatible = "arm,vexpress-sysreg", },
122 {},
123 };
124 MODULE_DEVICE_TABLE(of, vexpress_sysreg_match);
125
126 static 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
134 module_platform_driver(vexpress_sysreg_driver);
135 MODULE_DESCRIPTION("Versatile Express system registers driver");
136 MODULE_LICENSE("GPL v2");
137