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_device.h> 14 #include <linux/property.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 const struct property_entry vexpress_sysreg_sys_led_props[] = { 42 PROPERTY_ENTRY_STRING("label", "sys_led"), 43 PROPERTY_ENTRY_U32("ngpios", 8), 44 { } 45 }; 46 47 static const struct software_node vexpress_sysreg_sys_led_swnode = { 48 .properties = vexpress_sysreg_sys_led_props, 49 }; 50 51 static const struct property_entry vexpress_sysreg_sys_mci_props[] = { 52 PROPERTY_ENTRY_STRING("label", "sys_mci"), 53 PROPERTY_ENTRY_U32("ngpios", 2), 54 { } 55 }; 56 57 static const struct software_node vexpress_sysreg_sys_mci_swnode = { 58 .properties = vexpress_sysreg_sys_mci_props, 59 }; 60 61 static const struct property_entry vexpress_sysreg_sys_flash_props[] = { 62 PROPERTY_ENTRY_STRING("label", "sys_flash"), 63 PROPERTY_ENTRY_U32("ngpios", 1), 64 { } 65 }; 66 67 static const struct software_node vexpress_sysreg_sys_flash_swnode = { 68 .properties = vexpress_sysreg_sys_flash_props, 69 }; 70 71 static struct mfd_cell vexpress_sysreg_cells[] = { 72 { 73 .name = "basic-mmio-gpio", 74 .of_compatible = "arm,vexpress-sysreg,sys_led", 75 .num_resources = 1, 76 .resources = &DEFINE_RES_MEM_NAMED(SYS_LED, 0x4, "dat"), 77 .swnode = &vexpress_sysreg_sys_led_swnode, 78 }, { 79 .name = "basic-mmio-gpio", 80 .of_compatible = "arm,vexpress-sysreg,sys_mci", 81 .num_resources = 1, 82 .resources = &DEFINE_RES_MEM_NAMED(SYS_MCI, 0x4, "dat"), 83 .swnode = &vexpress_sysreg_sys_mci_swnode, 84 }, { 85 .name = "basic-mmio-gpio", 86 .of_compatible = "arm,vexpress-sysreg,sys_flash", 87 .num_resources = 1, 88 .resources = &DEFINE_RES_MEM_NAMED(SYS_FLASH, 0x4, "dat"), 89 .swnode = &vexpress_sysreg_sys_flash_swnode, 90 }, { 91 .name = "vexpress-syscfg", 92 .num_resources = 1, 93 .resources = &DEFINE_RES_MEM(SYS_MISC, 0x4c), 94 } 95 }; 96 97 static int vexpress_sysreg_probe(struct platform_device *pdev) 98 { 99 struct resource *mem; 100 void __iomem *base; 101 struct gpio_chip *mmc_gpio_chip; 102 103 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 104 if (!mem) 105 return -EINVAL; 106 107 base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem)); 108 if (!base) 109 return -ENOMEM; 110 111 /* 112 * Duplicated SYS_MCI pseudo-GPIO controller for compatibility with 113 * older trees using sysreg node for MMC control lines. 114 */ 115 mmc_gpio_chip = devm_kzalloc(&pdev->dev, sizeof(*mmc_gpio_chip), 116 GFP_KERNEL); 117 if (!mmc_gpio_chip) 118 return -ENOMEM; 119 bgpio_init(mmc_gpio_chip, &pdev->dev, 0x4, base + SYS_MCI, 120 NULL, NULL, NULL, NULL, 0); 121 mmc_gpio_chip->ngpio = 2; 122 devm_gpiochip_add_data(&pdev->dev, mmc_gpio_chip, NULL); 123 124 return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO, 125 vexpress_sysreg_cells, 126 ARRAY_SIZE(vexpress_sysreg_cells), mem, 0, NULL); 127 } 128 129 static const struct of_device_id vexpress_sysreg_match[] = { 130 { .compatible = "arm,vexpress-sysreg", }, 131 {}, 132 }; 133 MODULE_DEVICE_TABLE(of, vexpress_sysreg_match); 134 135 static struct platform_driver vexpress_sysreg_driver = { 136 .driver = { 137 .name = "vexpress-sysreg", 138 .of_match_table = vexpress_sysreg_match, 139 }, 140 .probe = vexpress_sysreg_probe, 141 }; 142 143 module_platform_driver(vexpress_sysreg_driver); 144 MODULE_DESCRIPTION("Versatile Express system registers driver"); 145 MODULE_LICENSE("GPL v2"); 146