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
  24 #include <asm/mach-types.h>
  25 #include <asm/mach/arch.h>
  26 #include <asm/mach/time.h>
  27 #include <asm/mach/map.h>
  28
  29 #include <linux/of.h>
  30 #include <linux/of_address.h>
  31 #include <linux/of_irq.h>
  32 #include <linux/of_platform.h>
  33
  34 #include "common.h"
  35
  36 #define LEGACY_GPIO_BASE        0xD8110000
  37 #define LEGACY_PMC_BASE         0xD8130000
  38
  39 /* Registers in GPIO Controller */
  40 #define VT8500_GPIO_MUX_REG     0x200
  41
  42 /* Registers in Power Management Controller */
  43 #define VT8500_HCR_REG          0x12
  44 #define VT8500_PMSR_REG         0x60
  45
  46 static void __iomem *pmc_base;
  47
  48 void vt8500_restart(char mode, const char *cmd)
  49 {
  50         if (pmc_base)
  51                 writel(1, pmc_base + VT8500_PMSR_REG);
  52 }
  53
  54 static struct map_desc vt8500_io_desc[] __initdata = {
  55         /* SoC MMIO registers */
  56         [0] = {
  57                 .virtual        = 0xf8000000,
  58                 .pfn            = __phys_to_pfn(0xd8000000),
  59                 .length         = 0x00390000, /* max of all chip variants */
  60                 .type           = MT_DEVICE
  61         },
  62 };
  63
  64 void __init vt8500_map_io(void)
  65 {
  66         iotable_init(vt8500_io_desc, ARRAY_SIZE(vt8500_io_desc));
  67 }
  68
  69 static void vt8500_power_off(void)
  70 {
  71         local_irq_disable();
  72         writew(5, pmc_base + VT8500_HCR_REG);
  73         asm("mcr%? p15, 0, %0, c7, c0, 4" : : "r" (0));
  74 }
  75
  76 void __init vt8500_init(void)
  77 {
  78         struct device_node *np;
  79 #if defined(CONFIG_FB_VT8500) || defined(CONFIG_FB_WM8505)
  80         struct device_node *fb;
  81         void __iomem *gpio_base;
  82 #endif
  83
  84 #ifdef CONFIG_FB_VT8500
  85         fb = of_find_compatible_node(NULL, NULL, "via,vt8500-fb");
  86         if (fb) {
  87                 np = of_find_compatible_node(NULL, NULL, "via,vt8500-gpio");
  88                 if (np) {
  89                         gpio_base = of_iomap(np, 0);
  90
  91                         if (!gpio_base)
  92                                 pr_err("%s: of_iomap(gpio_mux) failed\n",
  93                                                                 __func__);
  94
  95                         of_node_put(np);
  96                 } else {
  97                         gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000);
  98                         if (!gpio_base)
  99                                 pr_err("%s: ioremap(legacy_gpio_mux) failed\n",
 100                                                                 __func__);
 101                 }
 102                 if (gpio_base) {
 103                         writel(readl(gpio_base + VT8500_GPIO_MUX_REG) | 1,
 104                                 gpio_base + VT8500_GPIO_MUX_REG);
 105                         iounmap(gpio_base);
 106                 } else
 107                         pr_err("%s: Could not remap GPIO mux\n", __func__);
 108
 109                 of_node_put(fb);
 110         }
 111 #endif
 112
 113 #ifdef CONFIG_FB_WM8505
 114         fb = of_find_compatible_node(NULL, NULL, "wm,wm8505-fb");
 115         if (fb) {
 116                 np = of_find_compatible_node(NULL, NULL, "wm,wm8505-gpio");
 117                 if (!np)
 118                         np = of_find_compatible_node(NULL, NULL,
 119                                                         "wm,wm8650-gpio");
 120                 if (np) {
 121                         gpio_base = of_iomap(np, 0);
 122
 123                         if (!gpio_base)
 124                                 pr_err("%s: of_iomap(gpio_mux) failed\n",
 125                                                                 __func__);
 126
 127                         of_node_put(np);
 128                 } else {
 129                         gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000);
 130                         if (!gpio_base)
 131                                 pr_err("%s: ioremap(legacy_gpio_mux) failed\n",
 132                                                                 __func__);
 133                 }
 134                 if (gpio_base) {
 135                         writel(readl(gpio_base + VT8500_GPIO_MUX_REG) |
 136                                 0x80000000, gpio_base + VT8500_GPIO_MUX_REG);
 137                         iounmap(gpio_base);
 138                 } else
 139                         pr_err("%s: Could not remap GPIO mux\n", __func__);
 140
 141                 of_node_put(fb);
 142         }
 143 #endif
 144
 145         np = of_find_compatible_node(NULL, NULL, "via,vt8500-pmc");
 146         if (np) {
 147                 pmc_base = of_iomap(np, 0);
 148
 149                 if (!pmc_base)
 150                         pr_err("%s:of_iomap(pmc) failed\n", __func__);
 151
 152                 of_node_put(np);
 153         } else {
 154                 pmc_base = ioremap(LEGACY_PMC_BASE, 0x1000);
 155                 if (!pmc_base)
 156                         pr_err("%s:ioremap(power_off) failed\n", __func__);
 157         }
 158         if (pmc_base)
 159                 pm_power_off = &vt8500_power_off;
 160         else
 161                 pr_err("%s: PMC Hibernation register could not be remapped, not enabling power off!\n", __func__);
 162
 163         vtwm_clk_init(pmc_base);
 164
 165         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 166 }
 167
 168 static const struct of_device_id vt8500_irq_match[] __initconst = {
 169         { .compatible = "via,vt8500-intc", .data = vt8500_irq_init, },
 170         { /* sentinel */ },
 171 };
 172
 173 static void __init vt8500_init_irq(void)
 174 {
 175         of_irq_init(vt8500_irq_match);
 176 };
 177
 178 static struct sys_timer vt8500_timer = {
 179         .init = vt8500_timer_init,
 180 };
 181
 182 static const char * const vt8500_dt_compat[] = {
 183         "via,vt8500",
 184         "wm,wm8650",
 185         "wm,wm8505",
 186 };
 187
 188 DT_MACHINE_START(WMT_DT, "VIA/Wondermedia SoC (Device Tree Support)")
 189         .dt_compat      = vt8500_dt_compat,
 190         .map_io         = vt8500_map_io,
 191         .init_irq       = vt8500_init_irq,
 192         .timer          = &vt8500_timer,
 193         .init_machine   = vt8500_init,
 194         .restart        = vt8500_restart,
 195         .handle_irq     = vt8500_handle_irq,
 196 MACHINE_END
 197