arch/arm/mach-vt8500/vt8500.c

   1 /*
   2  *  arch/arm/mach-vt8500/vt8500.c
   3  *
   4  *  Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <linux/io.h>
  22 #include <linux/pm.h>
  23 #include <linux/reboot.h>
  24
  25 #include <asm/mach-types.h>
  26 #include <asm/mach/arch.h>
  27 #include <asm/mach/time.h>
  28 #include <asm/mach/map.h>
  29
  30 #include <linux/of.h>
  31 #include <linux/of_address.h>
  32 #include <linux/of_irq.h>
  33 #include <linux/of_platform.h>
  34
  35 #define LEGACY_GPIO_BASE        0xD8110000
  36 #define LEGACY_PMC_BASE         0xD8130000
  37
  38 /* Registers in GPIO Controller */
  39 #define VT8500_GPIO_MUX_REG     0x200
  40
  41 /* Registers in Power Management Controller */
  42 #define VT8500_HCR_REG          0x12
  43 #define VT8500_PMSR_REG         0x60
  44
  45 static void __iomem *pmc_base;
  46
  47 void vt8500_restart(enum reboot_mode mode, const char *cmd)
  48 {
  49         if (pmc_base)
  50                 writel(1, pmc_base + VT8500_PMSR_REG);
  51 }
  52
  53 static struct map_desc vt8500_io_desc[] __initdata = {
  54         /* SoC MMIO registers */
  55         [0] = {
  56                 .virtual        = 0xf8000000,
  57                 .pfn            = __phys_to_pfn(0xd8000000),
  58                 .length         = 0x00390000, /* max of all chip variants */
  59                 .type           = MT_DEVICE
  60         },
  61 };
  62
  63 void __init vt8500_map_io(void)
  64 {
  65         iotable_init(vt8500_io_desc, ARRAY_SIZE(vt8500_io_desc));
  66 }
  67
  68 static void vt8500_power_off(void)
  69 {
  70         local_irq_disable();
  71         writew(5, pmc_base + VT8500_HCR_REG);
  72         asm("mcr%? p15, 0, %0, c7, c0, 4" : : "r" (0));
  73 }
  74
  75 void __init vt8500_init(void)
  76 {
  77         struct device_node *np;
  78 #if defined(CONFIG_FB_VT8500) || defined(CONFIG_FB_WM8505)
  79         struct device_node *fb;
  80         void __iomem *gpio_base;
  81 #endif
  82
  83 #ifdef CONFIG_FB_VT8500
  84         fb = of_find_compatible_node(NULL, NULL, "via,vt8500-fb");
  85         if (fb) {
  86                 np = of_find_compatible_node(NULL, NULL, "via,vt8500-gpio");
  87                 if (np) {
  88                         gpio_base = of_iomap(np, 0);
  89
  90                         if (!gpio_base)
  91                                 pr_err("%s: of_iomap(gpio_mux) failed\n",
  92                                                                 __func__);
  93
  94                         of_node_put(np);
  95                 } else {
  96                         gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000);
  97                         if (!gpio_base)
  98                                 pr_err("%s: ioremap(legacy_gpio_mux) failed\n",
  99                                                                 __func__);
 100                 }
 101                 if (gpio_base) {
 102                         writel(readl(gpio_base + VT8500_GPIO_MUX_REG) | 1,
 103                                 gpio_base + VT8500_GPIO_MUX_REG);
 104                         iounmap(gpio_base);
 105                 } else
 106                         pr_err("%s: Could not remap GPIO mux\n", __func__);
 107
 108                 of_node_put(fb);
 109         }
 110 #endif
 111
 112 #ifdef CONFIG_FB_WM8505
 113         fb = of_find_compatible_node(NULL, NULL, "wm,wm8505-fb");
 114         if (fb) {
 115                 np = of_find_compatible_node(NULL, NULL, "wm,wm8505-gpio");
 116                 if (!np)
 117                         np = of_find_compatible_node(NULL, NULL,
 118                                                         "wm,wm8650-gpio");
 119                 if (np) {
 120                         gpio_base = of_iomap(np, 0);
 121
 122                         if (!gpio_base)
 123                                 pr_err("%s: of_iomap(gpio_mux) failed\n",
 124                                                                 __func__);
 125
 126                         of_node_put(np);
 127                 } else {
 128                         gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000);
 129                         if (!gpio_base)
 130                                 pr_err("%s: ioremap(legacy_gpio_mux) failed\n",
 131                                                                 __func__);
 132                 }
 133                 if (gpio_base) {
 134                         writel(readl(gpio_base + VT8500_GPIO_MUX_REG) |
 135                                 0x80000000, gpio_base + VT8500_GPIO_MUX_REG);
 136                         iounmap(gpio_base);
 137                 } else
 138                         pr_err("%s: Could not remap GPIO mux\n", __func__);
 139
 140                 of_node_put(fb);
 141         }
 142 #endif
 143
 144         np = of_find_compatible_node(NULL, NULL, "via,vt8500-pmc");
 145         if (np) {
 146                 pmc_base = of_iomap(np, 0);
 147
 148                 if (!pmc_base)
 149                         pr_err("%s:of_iomap(pmc) failed\n", __func__);
 150
 151                 of_node_put(np);
 152         } else {
 153                 pmc_base = ioremap(LEGACY_PMC_BASE, 0x1000);
 154                 if (!pmc_base)
 155                         pr_err("%s:ioremap(power_off) failed\n", __func__);
 156         }
 157         if (pmc_base)
 158                 pm_power_off = &vt8500_power_off;
 159         else
 160                 pr_err("%s: PMC Hibernation register could not be remapped, not enabling power off!\n", __func__);
 161
 162         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 163 }
 164
 165 static const char * const vt8500_dt_compat[] = {
 166         "via,vt8500",
 167         "wm,wm8650",
 168         "wm,wm8505",
 169         "wm,wm8750",
 170         "wm,wm8850",
 171         NULL
 172 };
 173
 174 DT_MACHINE_START(WMT_DT, "VIA/Wondermedia SoC (Device Tree Support)")
 175         .dt_compat      = vt8500_dt_compat,
 176         .map_io         = vt8500_map_io,
 177         .init_machine   = vt8500_init,
 178         .restart        = vt8500_restart,
 179 MACHINE_END
 180