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/clocksource.h>
  22 #include <linux/io.h>
  23 #include <linux/irqchip.h>
  24 #include <linux/pm.h>
  25
  26 #include <asm/mach-types.h>
  27 #include <asm/mach/arch.h>
  28 #include <asm/mach/time.h>
  29 #include <asm/mach/map.h>
  30
  31 #include <linux/of.h>
  32 #include <linux/of_address.h>
  33 #include <linux/of_irq.h>
  34 #include <linux/of_platform.h>
  35
  36 #include "common.h"
  37
  38 #define LEGACY_GPIO_BASE        0xD8110000
  39 #define LEGACY_PMC_BASE         0xD8130000
  40
  41 /* Registers in GPIO Controller */
  42 #define VT8500_GPIO_MUX_REG     0x200
  43
  44 /* Registers in Power Management Controller */
  45 #define VT8500_HCR_REG          0x12
  46 #define VT8500_PMSR_REG         0x60
  47
  48 static void __iomem *pmc_base;
  49
  50 void vt8500_restart(char mode, const char *cmd)
  51 {
  52         if (pmc_base)
  53                 writel(1, pmc_base + VT8500_PMSR_REG);
  54 }
  55
  56 static struct map_desc vt8500_io_desc[] __initdata = {
  57         /* SoC MMIO registers */
  58         [0] = {
  59                 .virtual        = 0xf8000000,
  60                 .pfn            = __phys_to_pfn(0xd8000000),
  61                 .length         = 0x00390000, /* max of all chip variants */
  62                 .type           = MT_DEVICE
  63         },
  64 };
  65
  66 void __init vt8500_map_io(void)
  67 {
  68         iotable_init(vt8500_io_desc, ARRAY_SIZE(vt8500_io_desc));
  69 }
  70
  71 static void vt8500_power_off(void)
  72 {
  73         local_irq_disable();
  74         writew(5, pmc_base + VT8500_HCR_REG);
  75         asm("mcr%? p15, 0, %0, c7, c0, 4" : : "r" (0));
  76 }
  77
  78 void __init vt8500_init(void)
  79 {
  80         struct device_node *np;
  81 #if defined(CONFIG_FB_VT8500) || defined(CONFIG_FB_WM8505)
  82         struct device_node *fb;
  83         void __iomem *gpio_base;
  84 #endif
  85
  86 #ifdef CONFIG_FB_VT8500
  87         fb = of_find_compatible_node(NULL, NULL, "via,vt8500-fb");
  88         if (fb) {
  89                 np = of_find_compatible_node(NULL, NULL, "via,vt8500-gpio");
  90                 if (np) {
  91                         gpio_base = of_iomap(np, 0);
  92
  93                         if (!gpio_base)
  94                                 pr_err("%s: of_iomap(gpio_mux) failed\n",
  95                                                                 __func__);
  96
  97                         of_node_put(np);
  98                 } else {
  99                         gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000);
 100                         if (!gpio_base)
 101                                 pr_err("%s: ioremap(legacy_gpio_mux) failed\n",
 102                                                                 __func__);
 103                 }
 104                 if (gpio_base) {
 105                         writel(readl(gpio_base + VT8500_GPIO_MUX_REG) | 1,
 106                                 gpio_base + VT8500_GPIO_MUX_REG);
 107                         iounmap(gpio_base);
 108                 } else
 109                         pr_err("%s: Could not remap GPIO mux\n", __func__);
 110
 111                 of_node_put(fb);
 112         }
 113 #endif
 114
 115 #ifdef CONFIG_FB_WM8505
 116         fb = of_find_compatible_node(NULL, NULL, "wm,wm8505-fb");
 117         if (fb) {
 118                 np = of_find_compatible_node(NULL, NULL, "wm,wm8505-gpio");
 119                 if (!np)
 120                         np = of_find_compatible_node(NULL, NULL,
 121                                                         "wm,wm8650-gpio");
 122                 if (np) {
 123                         gpio_base = of_iomap(np, 0);
 124
 125                         if (!gpio_base)
 126                                 pr_err("%s: of_iomap(gpio_mux) failed\n",
 127                                                                 __func__);
 128
 129                         of_node_put(np);
 130                 } else {
 131                         gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000);
 132                         if (!gpio_base)
 133                                 pr_err("%s: ioremap(legacy_gpio_mux) failed\n",
 134                                                                 __func__);
 135                 }
 136                 if (gpio_base) {
 137                         writel(readl(gpio_base + VT8500_GPIO_MUX_REG) |
 138                                 0x80000000, gpio_base + VT8500_GPIO_MUX_REG);
 139                         iounmap(gpio_base);
 140                 } else
 141                         pr_err("%s: Could not remap GPIO mux\n", __func__);
 142
 143                 of_node_put(fb);
 144         }
 145 #endif
 146
 147         np = of_find_compatible_node(NULL, NULL, "via,vt8500-pmc");
 148         if (np) {
 149                 pmc_base = of_iomap(np, 0);
 150
 151                 if (!pmc_base)
 152                         pr_err("%s:of_iomap(pmc) failed\n", __func__);
 153
 154                 of_node_put(np);
 155         } else {
 156                 pmc_base = ioremap(LEGACY_PMC_BASE, 0x1000);
 157                 if (!pmc_base)
 158                         pr_err("%s:ioremap(power_off) failed\n", __func__);
 159         }
 160         if (pmc_base)
 161                 pm_power_off = &vt8500_power_off;
 162         else
 163                 pr_err("%s: PMC Hibernation register could not be remapped, not enabling power off!\n", __func__);
 164
 165         vtwm_clk_init(pmc_base);
 166
 167         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 168 }
 169
 170 static const char * const vt8500_dt_compat[] = {
 171         "via,vt8500",
 172         "wm,wm8650",
 173         "wm,wm8505",
 174         "wm,wm8750",
 175         "wm,wm8850",
 176         NULL
 177 };
 178
 179 DT_MACHINE_START(WMT_DT, "VIA/Wondermedia SoC (Device Tree Support)")
 180         .dt_compat      = vt8500_dt_compat,
 181         .map_io         = vt8500_map_io,
 182         .init_irq       = irqchip_init,
 183         .init_machine   = vt8500_init,
 184         .init_time      = clocksource_of_init,
 185         .restart        = vt8500_restart,
 186 MACHINE_END
 187