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/slab.h> 15 #include <linux/stat.h> 16 17 #define SYS_ID 0x000 18 #define SYS_SW 0x004 19 #define SYS_LED 0x008 20 #define SYS_100HZ 0x024 21 #define SYS_FLAGSSET 0x030 22 #define SYS_FLAGSCLR 0x034 23 #define SYS_NVFLAGS 0x038 24 #define SYS_NVFLAGSSET 0x038 25 #define SYS_NVFLAGSCLR 0x03c 26 #define SYS_MCI 0x048 27 #define SYS_FLASH 0x04c 28 #define SYS_CFGSW 0x058 29 #define SYS_24MHZ 0x05c 30 #define SYS_MISC 0x060 31 #define SYS_DMA 0x064 32 #define SYS_PROCID0 0x084 33 #define SYS_PROCID1 0x088 34 #define SYS_CFGDATA 0x0a0 35 #define SYS_CFGCTRL 0x0a4 36 #define SYS_CFGSTAT 0x0a8 37 38 /* The sysreg block is just a random collection of various functions... */ 39 40 static struct bgpio_pdata vexpress_sysreg_sys_led_pdata = { 41 .label = "sys_led", 42 .base = -1, 43 .ngpio = 8, 44 }; 45 46 static struct bgpio_pdata vexpress_sysreg_sys_mci_pdata = { 47 .label = "sys_mci", 48 .base = -1, 49 .ngpio = 2, 50 }; 51 52 static struct bgpio_pdata vexpress_sysreg_sys_flash_pdata = { 53 .label = "sys_flash", 54 .base = -1, 55 .ngpio = 1, 56 }; 57 58 static struct mfd_cell vexpress_sysreg_cells[] = { 59 { 60 .name = "basic-mmio-gpio", 61 .of_compatible = "arm,vexpress-sysreg,sys_led", 62 .num_resources = 1, 63 .resources = &DEFINE_RES_MEM_NAMED(SYS_LED, 0x4, "dat"), 64 .platform_data = &vexpress_sysreg_sys_led_pdata, 65 .pdata_size = sizeof(vexpress_sysreg_sys_led_pdata), 66 }, { 67 .name = "basic-mmio-gpio", 68 .of_compatible = "arm,vexpress-sysreg,sys_mci", 69 .num_resources = 1, 70 .resources = &DEFINE_RES_MEM_NAMED(SYS_MCI, 0x4, "dat"), 71 .platform_data = &vexpress_sysreg_sys_mci_pdata, 72 .pdata_size = sizeof(vexpress_sysreg_sys_mci_pdata), 73 }, { 74 .name = "basic-mmio-gpio", 75 .of_compatible = "arm,vexpress-sysreg,sys_flash", 76 .num_resources = 1, 77 .resources = &DEFINE_RES_MEM_NAMED(SYS_FLASH, 0x4, "dat"), 78 .platform_data = &vexpress_sysreg_sys_flash_pdata, 79 .pdata_size = sizeof(vexpress_sysreg_sys_flash_pdata), 80 }, { 81 .name = "vexpress-syscfg", 82 .num_resources = 1, 83 .resources = &DEFINE_RES_MEM(SYS_MISC, 0x4c), 84 } 85 }; 86 87 static int vexpress_sysreg_probe(struct platform_device *pdev) 88 { 89 struct resource *mem; 90 void __iomem *base; 91 struct gpio_chip *mmc_gpio_chip; 92 93 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 94 if (!mem) 95 return -EINVAL; 96 97 base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem)); 98 if (!base) 99 return -ENOMEM; 100 101 /* 102 * Duplicated SYS_MCI pseudo-GPIO controller for compatibility with 103 * older trees using sysreg node for MMC control lines. 104 */ 105 mmc_gpio_chip = devm_kzalloc(&pdev->dev, sizeof(*mmc_gpio_chip), 106 GFP_KERNEL); 107 if (!mmc_gpio_chip) 108 return -ENOMEM; 109 bgpio_init(mmc_gpio_chip, &pdev->dev, 0x4, base + SYS_MCI, 110 NULL, NULL, NULL, NULL, 0); 111 mmc_gpio_chip->ngpio = 2; 112 devm_gpiochip_add_data(&pdev->dev, mmc_gpio_chip, NULL); 113 114 return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO, 115 vexpress_sysreg_cells, 116 ARRAY_SIZE(vexpress_sysreg_cells), mem, 0, NULL); 117 } 118 119 static const struct of_device_id vexpress_sysreg_match[] = { 120 { .compatible = "arm,vexpress-sysreg", }, 121 {}, 122 }; 123 MODULE_DEVICE_TABLE(of, vexpress_sysreg_match); 124 125 static struct platform_driver vexpress_sysreg_driver = { 126 .driver = { 127 .name = "vexpress-sysreg", 128 .of_match_table = vexpress_sysreg_match, 129 }, 130 .probe = vexpress_sysreg_probe, 131 }; 132 133 module_platform_driver(vexpress_sysreg_driver); 134 MODULE_DESCRIPTION("Versatile Express system registers driver"); 135 MODULE_LICENSE("GPL v2"); 136