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 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