drivers/mfd/vexpress-sysreg.c

   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
  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");