arch/arm/mach-omap/common.c

   1 /*
   2  * linux/arch/arm/mach-omap/common.c
   3  *
   4  * Code common to all OMAP machines.
   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 version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/config.h>
  11 #include <linux/module.h>
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/delay.h>
  15 #include <linux/pm.h>
  16 #include <linux/console.h>
  17
  18 #include <asm/hardware.h>
  19 #include <asm/system.h>
  20 #include <asm/pgtable.h>
  21 #include <asm/mach/map.h>
  22 #include <asm/arch/clocks.h>
  23 #include <asm/arch/board.h>
  24 #include <asm/io.h>
  25
  26 /*
  27  * ----------------------------------------------------------------------------
  28  * OMAP I/O mapping
  29  *
  30  * The machine specific code may provide the extra mapping besides the
  31  * default mapping provided here.
  32  * ----------------------------------------------------------------------------
  33  */
  34
  35 static struct map_desc omap_io_desc[] __initdata = {
  36  { IO_VIRT,             IO_PHYS,             IO_SIZE,              MT_DEVICE },
  37 };
  38
  39 #ifdef CONFIG_ARCH_OMAP730
  40 static struct map_desc omap730_io_desc[] __initdata = {
  41  { OMAP730_DSP_BASE,    OMAP730_DSP_START,    OMAP730_DSP_SIZE,    MT_DEVICE },
  42  { OMAP730_DSPREG_BASE, OMAP730_DSPREG_START, OMAP730_DSPREG_SIZE, MT_DEVICE },
  43  { OMAP730_SRAM_BASE,   OMAP730_SRAM_START,   OMAP730_SRAM_SIZE,   MT_DEVICE }
  44 };
  45 #endif
  46
  47 #ifdef CONFIG_ARCH_OMAP1510
  48 static struct map_desc omap1510_io_desc[] __initdata = {
  49  { OMAP1510_DSP_BASE,    OMAP1510_DSP_START,    OMAP1510_DSP_SIZE,    MT_DEVICE },
  50  { OMAP1510_DSPREG_BASE, OMAP1510_DSPREG_START, OMAP1510_DSPREG_SIZE, MT_DEVICE },
  51  { OMAP1510_SRAM_BASE,   OMAP1510_SRAM_START,   OMAP1510_SRAM_SIZE,   MT_DEVICE }
  52 };
  53 #endif
  54
  55 #ifdef CONFIG_ARCH_OMAP1610
  56 static struct map_desc omap1610_io_desc[] __initdata = {
  57  { OMAP1610_DSP_BASE,    OMAP1610_DSP_START,    OMAP1610_DSP_SIZE,    MT_DEVICE },
  58  { OMAP1610_DSPREG_BASE, OMAP1610_DSPREG_START, OMAP1610_DSPREG_SIZE, MT_DEVICE },
  59  { OMAP1610_SRAM_BASE,   OMAP1610_SRAM_START,   OMAP1610_SRAM_SIZE,   MT_DEVICE }
  60 };
  61 #endif
  62
  63 #ifdef CONFIG_ARCH_OMAP5912
  64 static struct map_desc omap5912_io_desc[] __initdata = {
  65  { OMAP5912_DSP_BASE,    OMAP5912_DSP_START,    OMAP5912_DSP_SIZE,    MT_DEVICE },
  66  { OMAP5912_DSPREG_BASE, OMAP5912_DSPREG_START, OMAP5912_DSPREG_SIZE, MT_DEVICE },
  67  { OMAP5912_SRAM_BASE,   OMAP5912_SRAM_START,   OMAP5912_SRAM_SIZE,   MT_DEVICE }
  68 };
  69 #endif
  70
  71 static int initialized = 0;
  72
  73 static void __init _omap_map_io(void)
  74 {
  75         initialized = 1;
  76
  77         /* We have to initialize the IO space mapping before we can run
  78          * cpu_is_omapxxx() macros. */
  79         iotable_init(omap_io_desc, ARRAY_SIZE(omap_io_desc));
  80
  81 #ifdef CONFIG_ARCH_OMAP730
  82         if (cpu_is_omap730()) {
  83                 iotable_init(omap730_io_desc, ARRAY_SIZE(omap730_io_desc));
  84         }
  85 #endif
  86 #ifdef CONFIG_ARCH_OMAP1510
  87         if (cpu_is_omap1510()) {
  88                 iotable_init(omap1510_io_desc, ARRAY_SIZE(omap1510_io_desc));
  89         }
  90 #endif
  91 #ifdef CONFIG_ARCH_OMAP1610
  92         if (cpu_is_omap1610()) {
  93                 iotable_init(omap1610_io_desc, ARRAY_SIZE(omap1610_io_desc));
  94         }
  95 #endif
  96 #ifdef CONFIG_ARCH_OMAP5912
  97         if (cpu_is_omap5912()) {
  98                 iotable_init(omap5912_io_desc, ARRAY_SIZE(omap5912_io_desc));
  99         }
 100 #endif
 101
 102         /* REVISIT: Refer to OMAP5910 Errata, Advisory SYS_1: "Timeout Abort
 103          * on a Posted Write in the TIPB Bridge".
 104          */
 105         omap_writew(0x0, MPU_PUBLIC_TIPB_CNTL_REG);
 106         omap_writew(0x0, MPU_PRIVATE_TIPB_CNTL_REG);
 107
 108         /* Must init clocks early to assure that timer interrupt works
 109          */
 110         init_ck();
 111 }
 112
 113 /*
 114  * This should only get called from board specific init
 115  */
 116 void omap_map_io(void)
 117 {
 118         if (!initialized)
 119                 _omap_map_io();
 120 }
 121
 122 extern int omap_bootloader_tag_len;
 123 extern u8 omap_bootloader_tag[];
 124
 125 const void *__omap_get_per_info(u16 tag, size_t len)
 126 {
 127         struct omap_board_info_entry *info = NULL;
 128
 129 #ifdef CONFIG_OMAP_BOOT_TAG
 130         if (omap_bootloader_tag_len > 4)
 131                 info = (struct omap_board_info_entry *) omap_bootloader_tag;
 132         while (info != NULL) {
 133                 u8 *next;
 134
 135                 if (info->tag == tag)
 136                         break;
 137
 138                 next = (u8 *) info + sizeof(*info) + info->len;
 139                 if (next >= omap_bootloader_tag + omap_bootloader_tag_len)
 140                         info = NULL;
 141                 else
 142                         info = (struct omap_board_info_entry *) next;
 143         }
 144 #endif
 145         if (info == NULL)
 146                 return NULL;
 147         if (info->len != len) {
 148                 printk(KERN_ERR "OMAP per_info: Length mismatch with tag %x (want %d, got %d)\n",
 149                        tag, len, info->len);
 150                 return NULL;
 151         }
 152
 153         return info->data;
 154 }
 155 EXPORT_SYMBOL(__omap_get_per_info);
 156
 157 static int __init omap_add_serial_console(void)
 158 {
 159         const struct omap_uart_info *info;
 160
 161         info = omap_get_per_info(OMAP_TAG_UART, struct omap_uart_info);
 162         if (info != NULL && info->console_uart) {
 163                 static char speed[11], *opt = NULL;
 164
 165                 if (info->console_speed) {
 166                         snprintf(speed, sizeof(speed), "%u", info->console_speed);
 167                         opt = speed;
 168                 }
 169                 return add_preferred_console("ttyS", info->console_uart - 1, opt);
 170         }
 171         return 0;
 172 }
 173 console_initcall(omap_add_serial_console);