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
  34 #define LEGACY_GPIO_BASE        0xD8110000
  35 #define LEGACY_PMC_BASE         0xD8130000
  36
  37 /* Registers in GPIO Controller */
  38 #define VT8500_GPIO_MUX_REG     0x200
  39
  40 /* Registers in Power Management Controller */
  41 #define VT8500_HCR_REG          0x12
  42 #define VT8500_PMSR_REG         0x60
  43
  44 static void __iomem *pmc_base;
  45
  46 static void vt8500_restart(enum reboot_mode mode, const char *cmd)
  47 {
  48         if (pmc_base)
  49                 writel(1, pmc_base + VT8500_PMSR_REG);
  50 }
  51
  52 static struct map_desc vt8500_io_desc[] __initdata = {
  53         /* SoC MMIO registers */
  54         [0] = {
  55                 .virtual        = 0xf8000000,
  56                 .pfn            = __phys_to_pfn(0xd8000000),
  57                 .length         = 0x00390000, /* max of all chip variants */
  58                 .type           = MT_DEVICE
  59         },
  60 };
  61
  62 static void __init vt8500_map_io(void)
  63 {
  64         iotable_init(vt8500_io_desc, ARRAY_SIZE(vt8500_io_desc));
  65 }
  66
  67 static void vt8500_power_off(void)
  68 {
  69         local_irq_disable();
  70         writew(5, pmc_base + VT8500_HCR_REG);
  71         asm("mcr p15, 0, %0, c7, c0, 4" : : "r" (0));
  72 }
  73
  74 static void __init vt8500_init(void)
  75 {
  76         struct device_node *np;
  77 #if defined(CONFIG_FB_VT8500) || defined(CONFIG_FB_WM8505)
  78         struct device_node *fb;
  79         void __iomem *gpio_base;
  80 #endif
  81
  82 #ifdef CONFIG_FB_VT8500
  83         fb = of_find_compatible_node(NULL, NULL, "via,vt8500-fb");
  84         if (fb) {
  85                 np = of_find_compatible_node(NULL, NULL, "via,vt8500-gpio");
  86                 if (np) {
  87                         gpio_base = of_iomap(np, 0);
  88
  89                         if (!gpio_base)
  90                                 pr_err("%s: of_iomap(gpio_mux) failed\n",
  91                                                                 __func__);
  92
  93                         of_node_put(np);
  94                 } else {
  95                         gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000);
  96                         if (!gpio_base)
  97                                 pr_err("%s: ioremap(legacy_gpio_mux) failed\n",
  98                                                                 __func__);
  99                 }
 100                 if (gpio_base) {
 101                         writel(readl(gpio_base + VT8500_GPIO_MUX_REG) | 1,
 102                                 gpio_base + VT8500_GPIO_MUX_REG);
 103                         iounmap(gpio_base);
 104                 } else
 105                         pr_err("%s: Could not remap GPIO mux\n", __func__);
 106
 107                 of_node_put(fb);
 108         }
 109 #endif
 110
 111 #ifdef CONFIG_FB_WM8505
 112         fb = of_find_compatible_node(NULL, NULL, "wm,wm8505-fb");
 113         if (fb) {
 114                 np = of_find_compatible_node(NULL, NULL, "wm,wm8505-gpio");
 115                 if (!np)
 116                         np = of_find_compatible_node(NULL, NULL,
 117                                                         "wm,wm8650-gpio");
 118                 if (np) {
 119                         gpio_base = of_iomap(np, 0);
 120
 121                         if (!gpio_base)
 122                                 pr_err("%s: of_iomap(gpio_mux) failed\n",
 123                                                                 __func__);
 124
 125                         of_node_put(np);
 126                 } else {
 127                         gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000);
 128                         if (!gpio_base)
 129                                 pr_err("%s: ioremap(legacy_gpio_mux) failed\n",
 130                                                                 __func__);
 131                 }
 132                 if (gpio_base) {
 133                         writel(readl(gpio_base + VT8500_GPIO_MUX_REG) |
 134                                 0x80000000, gpio_base + VT8500_GPIO_MUX_REG);
 135                         iounmap(gpio_base);
 136                 } else
 137                         pr_err("%s: Could not remap GPIO mux\n", __func__);
 138
 139                 of_node_put(fb);
 140         }
 141 #endif
 142
 143         np = of_find_compatible_node(NULL, NULL, "via,vt8500-pmc");
 144         if (np) {
 145                 pmc_base = of_iomap(np, 0);
 146
 147                 if (!pmc_base)
 148                         pr_err("%s:of_iomap(pmc) failed\n", __func__);
 149
 150                 of_node_put(np);
 151         } else {
 152                 pmc_base = ioremap(LEGACY_PMC_BASE, 0x1000);
 153                 if (!pmc_base)
 154                         pr_err("%s:ioremap(power_off) failed\n", __func__);
 155         }
 156         if (pmc_base)
 157                 pm_power_off = &vt8500_power_off;
 158         else
 159                 pr_err("%s: PMC Hibernation register could not be remapped, not enabling power off!\n", __func__);
 160 }
 161
 162 static const char * const vt8500_dt_compat[] = {
 163         "via,vt8500",
 164         "wm,wm8650",
 165         "wm,wm8505",
 166         "wm,wm8750",
 167         "wm,wm8850",
 168         NULL
 169 };
 170
 171 DT_MACHINE_START(WMT_DT, "VIA/Wondermedia SoC (Device Tree Support)")
 172         .dt_compat      = vt8500_dt_compat,
 173         .map_io         = vt8500_map_io,
 174         .init_machine   = vt8500_init,
 175         .restart        = vt8500_restart,
 176 MACHINE_END
 177