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 42 static 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 48 static const struct software_node vexpress_sysreg_sys_led_swnode = { 49 .properties = vexpress_sysreg_sys_led_props, 50 }; 51 52 static 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 58 static const struct software_node vexpress_sysreg_sys_mci_swnode = { 59 .properties = vexpress_sysreg_sys_mci_props, 60 }; 61 62 static 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 68 static const struct software_node vexpress_sysreg_sys_flash_swnode = { 69 .properties = vexpress_sysreg_sys_flash_props, 70 }; 71 72 static 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 98 static 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 } 143 144 static const struct of_device_id vexpress_sysreg_match[] = { 145 { .compatible = "arm,vexpress-sysreg", }, 146 {}, 147 }; 148 MODULE_DEVICE_TABLE(of, vexpress_sysreg_match); 149 150 static 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 }; 157 158 module_platform_driver(vexpress_sysreg_driver); 159 MODULE_DESCRIPTION("Versatile Express system registers driver"); 160 MODULE_LICENSE("GPL v2"); 161