drivers/mfd/vexpress-sysreg.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License version 2 as
   4  * published by the Free Software Foundation.
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9  * GNU General Public License for more details.
  10  *
  11  * Copyright (C) 2012 ARM Limited
  12  */
  13
  14 #include <linux/basic_mmio_gpio.h>
  15 #include <linux/err.h>
  16 #include <linux/io.h>
  17 #include <linux/mfd/core.h>
  18 #include <linux/of_address.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/platform_data/syscon.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/slab.h>
  23 #include <linux/stat.h>
  24 #include <linux/vexpress.h>
  25
  26 #define SYS_ID                  0x000
  27 #define SYS_SW                  0x004
  28 #define SYS_LED                 0x008
  29 #define SYS_100HZ               0x024
  30 #define SYS_FLAGSSET            0x030
  31 #define SYS_FLAGSCLR            0x034
  32 #define SYS_NVFLAGS             0x038
  33 #define SYS_NVFLAGSSET          0x038
  34 #define SYS_NVFLAGSCLR          0x03c
  35 #define SYS_MCI                 0x048
  36 #define SYS_FLASH               0x04c
  37 #define SYS_CFGSW               0x058
  38 #define SYS_24MHZ               0x05c
  39 #define SYS_MISC                0x060
  40 #define SYS_DMA                 0x064
  41 #define SYS_PROCID0             0x084
  42 #define SYS_PROCID1             0x088
  43 #define SYS_CFGDATA             0x0a0
  44 #define SYS_CFGCTRL             0x0a4
  45 #define SYS_CFGSTAT             0x0a8
  46
  47 #define SYS_HBI_MASK            0xfff
  48 #define SYS_PROCIDx_HBI_SHIFT   0
  49
  50 #define SYS_MCI_CARDIN          (1 << 0)
  51 #define SYS_MCI_WPROT           (1 << 1)
  52
  53 #define SYS_MISC_MASTERSITE     (1 << 14)
  54
  55
  56 static void __iomem *__vexpress_sysreg_base;
  57
  58 static void __iomem *vexpress_sysreg_base(void)
  59 {
  60         if (!__vexpress_sysreg_base) {
  61                 struct device_node *node = of_find_compatible_node(NULL, NULL,
  62                                 "arm,vexpress-sysreg");
  63
  64                 __vexpress_sysreg_base = of_iomap(node, 0);
  65         }
  66
  67         WARN_ON(!__vexpress_sysreg_base);
  68
  69         return __vexpress_sysreg_base;
  70 }
  71
  72
  73 static int vexpress_sysreg_get_master(void)
  74 {
  75         if (readl(vexpress_sysreg_base() + SYS_MISC) & SYS_MISC_MASTERSITE)
  76                 return VEXPRESS_SITE_DB2;
  77
  78         return VEXPRESS_SITE_DB1;
  79 }
  80
  81 void vexpress_flags_set(u32 data)
  82 {
  83         writel(~0, vexpress_sysreg_base() + SYS_FLAGSCLR);
  84         writel(data, vexpress_sysreg_base() + SYS_FLAGSSET);
  85 }
  86
  87 unsigned int vexpress_get_mci_cardin(struct device *dev)
  88 {
  89         return readl(vexpress_sysreg_base() + SYS_MCI) & SYS_MCI_CARDIN;
  90 }
  91
  92 u32 vexpress_get_procid(int site)
  93 {
  94         if (site == VEXPRESS_SITE_MASTER)
  95                 site = vexpress_sysreg_get_master();
  96
  97         return readl(vexpress_sysreg_base() + (site == VEXPRESS_SITE_DB1 ?
  98                         SYS_PROCID0 : SYS_PROCID1));
  99 }
 100
 101 void __iomem *vexpress_get_24mhz_clock_base(void)
 102 {
 103         return vexpress_sysreg_base() + SYS_24MHZ;
 104 }
 105
 106
 107 void __init vexpress_sysreg_early_init(void __iomem *base)
 108 {
 109         __vexpress_sysreg_base = base;
 110
 111         vexpress_config_set_master(vexpress_sysreg_get_master());
 112 }
 113
 114
 115 /* The sysreg block is just a random collection of various functions... */
 116
 117 static struct syscon_platform_data vexpress_sysreg_sys_id_pdata = {
 118         .label = "sys_id",
 119 };
 120
 121 static struct bgpio_pdata vexpress_sysreg_sys_led_pdata = {
 122         .label = "sys_led",
 123         .base = -1,
 124         .ngpio = 8,
 125 };
 126
 127 static struct bgpio_pdata vexpress_sysreg_sys_mci_pdata = {
 128         .label = "sys_mci",
 129         .base = -1,
 130         .ngpio = 2,
 131 };
 132
 133 static struct bgpio_pdata vexpress_sysreg_sys_flash_pdata = {
 134         .label = "sys_flash",
 135         .base = -1,
 136         .ngpio = 1,
 137 };
 138
 139 static struct syscon_platform_data vexpress_sysreg_sys_misc_pdata = {
 140         .label = "sys_misc",
 141 };
 142
 143 static struct syscon_platform_data vexpress_sysreg_sys_procid_pdata = {
 144         .label = "sys_procid",
 145 };
 146
 147 static struct mfd_cell vexpress_sysreg_cells[] = {
 148         {
 149                 .name = "syscon",
 150                 .num_resources = 1,
 151                 .resources = (struct resource []) {
 152                         DEFINE_RES_MEM(SYS_ID, 0x4),
 153                 },
 154                 .platform_data = &vexpress_sysreg_sys_id_pdata,
 155                 .pdata_size = sizeof(vexpress_sysreg_sys_id_pdata),
 156         }, {
 157                 .name = "basic-mmio-gpio",
 158                 .of_compatible = "arm,vexpress-sysreg,sys_led",
 159                 .num_resources = 1,
 160                 .resources = (struct resource []) {
 161                         DEFINE_RES_MEM_NAMED(SYS_LED, 0x4, "dat"),
 162                 },
 163                 .platform_data = &vexpress_sysreg_sys_led_pdata,
 164                 .pdata_size = sizeof(vexpress_sysreg_sys_led_pdata),
 165         }, {
 166                 .name = "basic-mmio-gpio",
 167                 .of_compatible = "arm,vexpress-sysreg,sys_mci",
 168                 .num_resources = 1,
 169                 .resources = (struct resource []) {
 170                         DEFINE_RES_MEM_NAMED(SYS_MCI, 0x4, "dat"),
 171                 },
 172                 .platform_data = &vexpress_sysreg_sys_mci_pdata,
 173                 .pdata_size = sizeof(vexpress_sysreg_sys_mci_pdata),
 174         }, {
 175                 .name = "basic-mmio-gpio",
 176                 .of_compatible = "arm,vexpress-sysreg,sys_flash",
 177                 .num_resources = 1,
 178                 .resources = (struct resource []) {
 179                         DEFINE_RES_MEM_NAMED(SYS_FLASH, 0x4, "dat"),
 180                 },
 181                 .platform_data = &vexpress_sysreg_sys_flash_pdata,
 182                 .pdata_size = sizeof(vexpress_sysreg_sys_flash_pdata),
 183         }, {
 184                 .name = "syscon",
 185                 .num_resources = 1,
 186                 .resources = (struct resource []) {
 187                         DEFINE_RES_MEM(SYS_MISC, 0x4),
 188                 },
 189                 .platform_data = &vexpress_sysreg_sys_misc_pdata,
 190                 .pdata_size = sizeof(vexpress_sysreg_sys_misc_pdata),
 191         }, {
 192                 .name = "syscon",
 193                 .num_resources = 1,
 194                 .resources = (struct resource []) {
 195                         DEFINE_RES_MEM(SYS_PROCID0, 0x8),
 196                 },
 197                 .platform_data = &vexpress_sysreg_sys_procid_pdata,
 198                 .pdata_size = sizeof(vexpress_sysreg_sys_procid_pdata),
 199         }, {
 200                 .name = "vexpress-syscfg",
 201                 .num_resources = 1,
 202                 .resources = (struct resource []) {
 203                         DEFINE_RES_MEM(SYS_CFGDATA, 0xc),
 204                 },
 205         }
 206 };
 207
 208 static int vexpress_sysreg_probe(struct platform_device *pdev)
 209 {
 210         struct resource *mem;
 211         void __iomem *base;
 212         struct bgpio_chip *mmc_gpio_chip;
 213         u32 dt_hbi;
 214
 215         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 216         if (!mem)
 217                 return -EINVAL;
 218
 219         base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
 220         if (!base)
 221                 return -ENOMEM;
 222
 223         vexpress_config_set_master(vexpress_sysreg_get_master());
 224
 225         /* Confirm board type against DT property, if available */
 226         if (of_property_read_u32(of_allnodes, "arm,hbi", &dt_hbi) == 0) {
 227                 u32 id = vexpress_get_procid(VEXPRESS_SITE_MASTER);
 228                 u32 hbi = (id >> SYS_PROCIDx_HBI_SHIFT) & SYS_HBI_MASK;
 229
 230                 if (WARN_ON(dt_hbi != hbi))
 231                         dev_warn(&pdev->dev, "DT HBI (%x) is not matching hardware (%x)!\n",
 232                                         dt_hbi, hbi);
 233         }
 234
 235         /*
 236          * Duplicated SYS_MCI pseudo-GPIO controller for compatibility with
 237          * older trees using sysreg node for MMC control lines.
 238          */
 239         mmc_gpio_chip = devm_kzalloc(&pdev->dev, sizeof(*mmc_gpio_chip),
 240                         GFP_KERNEL);
 241         if (!mmc_gpio_chip)
 242                 return -ENOMEM;
 243         bgpio_init(mmc_gpio_chip, &pdev->dev, 0x4, base + SYS_MCI,
 244                         NULL, NULL, NULL, NULL, 0);
 245         mmc_gpio_chip->gc.ngpio = 2;
 246         gpiochip_add(&mmc_gpio_chip->gc);
 247
 248         return mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO,
 249                         vexpress_sysreg_cells,
 250                         ARRAY_SIZE(vexpress_sysreg_cells), mem, 0, NULL);
 251 }
 252
 253 static const struct of_device_id vexpress_sysreg_match[] = {
 254         { .compatible = "arm,vexpress-sysreg", },
 255         {},
 256 };
 257
 258 static struct platform_driver vexpress_sysreg_driver = {
 259         .driver = {
 260                 .name = "vexpress-sysreg",
 261                 .of_match_table = vexpress_sysreg_match,
 262         },
 263         .probe = vexpress_sysreg_probe,
 264 };
 265
 266 static int __init vexpress_sysreg_init(void)
 267 {
 268         struct device_node *node;
 269
 270         /* Need the sysreg early, before any other device... */
 271         for_each_matching_node(node, vexpress_sysreg_match)
 272                 of_platform_device_create(node, NULL, NULL);
 273
 274         return platform_driver_register(&vexpress_sysreg_driver);
 275 }
 276 core_initcall(vexpress_sysreg_init);