arch/arm/plat-omap/common.c

   1 /*
   2  * linux/arch/arm/plat-omap/common.c
   3  *
   4  * Code common to all OMAP machines.
   5  * The file is created by Tony Lindgren <tony@atomide.com>
   6  *
   7  * Copyright (C) 2009 Texas Instruments
   8  * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/delay.h>
  18 #include <linux/console.h>
  19 #include <linux/serial.h>
  20 #include <linux/tty.h>
  21 #include <linux/serial_8250.h>
  22 #include <linux/serial_reg.h>
  23 #include <linux/clk.h>
  24 #include <linux/io.h>
  25
  26 #include <mach/hardware.h>
  27 #include <asm/system.h>
  28 #include <asm/pgtable.h>
  29 #include <asm/mach/map.h>
  30 #include <asm/setup.h>
  31
  32 #include <mach/common.h>
  33 #include <mach/board.h>
  34 #include <mach/control.h>
  35 #include <mach/mux.h>
  36 #include <mach/fpga.h>
  37
  38 #include <mach/clock.h>
  39
  40 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
  41 # include "../mach-omap2/sdrc.h"
  42 #endif
  43
  44 #define NO_LENGTH_CHECK 0xffffffff
  45
  46 unsigned char omap_bootloader_tag[512];
  47 int omap_bootloader_tag_len;
  48
  49 struct omap_board_config_kernel *omap_board_config;
  50 int omap_board_config_size;
  51
  52 static const void *get_config(u16 tag, size_t len, int skip, size_t *len_out)
  53 {
  54         struct omap_board_config_kernel *kinfo = NULL;
  55         int i;
  56
  57         /* Try to find the config from the board-specific structures
  58          * in the kernel. */
  59         for (i = 0; i < omap_board_config_size; i++) {
  60                 if (omap_board_config[i].tag == tag) {
  61                         if (skip == 0) {
  62                                 kinfo = &omap_board_config[i];
  63                                 break;
  64                         } else {
  65                                 skip--;
  66                         }
  67                 }
  68         }
  69         if (kinfo == NULL)
  70                 return NULL;
  71         return kinfo->data;
  72 }
  73
  74 const void *__omap_get_config(u16 tag, size_t len, int nr)
  75 {
  76         return get_config(tag, len, nr, NULL);
  77 }
  78 EXPORT_SYMBOL(__omap_get_config);
  79
  80 const void *omap_get_var_config(u16 tag, size_t *len)
  81 {
  82         return get_config(tag, NO_LENGTH_CHECK, 0, len);
  83 }
  84 EXPORT_SYMBOL(omap_get_var_config);
  85
  86 /*
  87  * 32KHz clocksource ... always available, on pretty most chips except
  88  * OMAP 730 and 1510.  Other timers could be used as clocksources, with
  89  * higher resolution in free-running counter modes (e.g. 12 MHz xtal),
  90  * but systems won't necessarily want to spend resources that way.
  91  */
  92
  93 #define OMAP16XX_TIMER_32K_SYNCHRONIZED         0xfffbc410
  94
  95 #if !(defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP15XX))
  96
  97 #include <linux/clocksource.h>
  98
  99 #ifdef CONFIG_ARCH_OMAP16XX
 100 static cycle_t omap16xx_32k_read(struct clocksource *cs)
 101 {
 102         return omap_readl(OMAP16XX_TIMER_32K_SYNCHRONIZED);
 103 }
 104 #else
 105 #define omap16xx_32k_read       NULL
 106 #endif
 107
 108 #ifdef CONFIG_ARCH_OMAP2420
 109 static cycle_t omap2420_32k_read(struct clocksource *cs)
 110 {
 111         return omap_readl(OMAP2420_32KSYNCT_BASE + 0x10);
 112 }
 113 #else
 114 #define omap2420_32k_read       NULL
 115 #endif
 116
 117 #ifdef CONFIG_ARCH_OMAP2430
 118 static cycle_t omap2430_32k_read(struct clocksource *cs)
 119 {
 120         return omap_readl(OMAP2430_32KSYNCT_BASE + 0x10);
 121 }
 122 #else
 123 #define omap2430_32k_read       NULL
 124 #endif
 125
 126 #ifdef CONFIG_ARCH_OMAP34XX
 127 static cycle_t omap34xx_32k_read(struct clocksource *cs)
 128 {
 129         return omap_readl(OMAP3430_32KSYNCT_BASE + 0x10);
 130 }
 131 #else
 132 #define omap34xx_32k_read       NULL
 133 #endif
 134
 135 #ifdef CONFIG_ARCH_OMAP4
 136 static cycle_t omap44xx_32k_read(struct clocksource *cs)
 137 {
 138         return omap_readl(OMAP4430_32KSYNCT_BASE + 0x10);
 139 }
 140 #else
 141 #define omap44xx_32k_read       NULL
 142 #endif
 143
 144 /*
 145  * Kernel assumes that sched_clock can be called early but may not have
 146  * things ready yet.
 147  */
 148 static cycle_t omap_32k_read_dummy(struct clocksource *cs)
 149 {
 150         return 0;
 151 }
 152
 153 static struct clocksource clocksource_32k = {
 154         .name           = "32k_counter",
 155         .rating         = 250,
 156         .read           = omap_32k_read_dummy,
 157         .mask           = CLOCKSOURCE_MASK(32),
 158         .shift          = 10,
 159         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 160 };
 161
 162 /*
 163  * Returns current time from boot in nsecs. It's OK for this to wrap
 164  * around for now, as it's just a relative time stamp.
 165  */
 166 unsigned long long sched_clock(void)
 167 {
 168         return clocksource_cyc2ns(clocksource_32k.read(&clocksource_32k),
 169                                   clocksource_32k.mult, clocksource_32k.shift);
 170 }
 171
 172 static int __init omap_init_clocksource_32k(void)
 173 {
 174         static char err[] __initdata = KERN_ERR
 175                         "%s: can't register clocksource!\n";
 176
 177         if (cpu_is_omap16xx() || cpu_class_is_omap2()) {
 178                 struct clk *sync_32k_ick;
 179
 180                 if (cpu_is_omap16xx())
 181                         clocksource_32k.read = omap16xx_32k_read;
 182                 else if (cpu_is_omap2420())
 183                         clocksource_32k.read = omap2420_32k_read;
 184                 else if (cpu_is_omap2430())
 185                         clocksource_32k.read = omap2430_32k_read;
 186                 else if (cpu_is_omap34xx())
 187                         clocksource_32k.read = omap34xx_32k_read;
 188                 else if (cpu_is_omap44xx())
 189                         clocksource_32k.read = omap44xx_32k_read;
 190                 else
 191                         return -ENODEV;
 192
 193                 sync_32k_ick = clk_get(NULL, "omap_32ksync_ick");
 194                 if (sync_32k_ick)
 195                         clk_enable(sync_32k_ick);
 196
 197                 clocksource_32k.mult = clocksource_hz2mult(32768,
 198                                             clocksource_32k.shift);
 199
 200                 if (clocksource_register(&clocksource_32k))
 201                         printk(err, clocksource_32k.name);
 202         }
 203         return 0;
 204 }
 205 arch_initcall(omap_init_clocksource_32k);
 206
 207 #endif  /* !(defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP15XX)) */
 208
 209 /* Global address base setup code */
 210
 211 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
 212
 213 static void __init __omap2_set_globals(struct omap_globals *omap2_globals)
 214 {
 215         omap2_set_globals_tap(omap2_globals);
 216         omap2_set_globals_sdrc(omap2_globals);
 217         omap2_set_globals_control(omap2_globals);
 218         omap2_set_globals_prcm(omap2_globals);
 219 }
 220
 221 #endif
 222
 223 #if defined(CONFIG_ARCH_OMAP2420)
 224
 225 static struct omap_globals omap242x_globals = {
 226         .class  = OMAP242X_CLASS,
 227         .tap    = OMAP2_IO_ADDRESS(0x48014000),
 228         .sdrc   = OMAP2_IO_ADDRESS(OMAP2420_SDRC_BASE),
 229         .sms    = OMAP2_IO_ADDRESS(OMAP2420_SMS_BASE),
 230         .ctrl   = OMAP2_IO_ADDRESS(OMAP2420_CTRL_BASE),
 231         .prm    = OMAP2_IO_ADDRESS(OMAP2420_PRM_BASE),
 232         .cm     = OMAP2_IO_ADDRESS(OMAP2420_CM_BASE),
 233 };
 234
 235 void __init omap2_set_globals_242x(void)
 236 {
 237         __omap2_set_globals(&omap242x_globals);
 238 }
 239 #endif
 240
 241 #if defined(CONFIG_ARCH_OMAP2430)
 242
 243 static struct omap_globals omap243x_globals = {
 244         .class  = OMAP243X_CLASS,
 245         .tap    = OMAP2_IO_ADDRESS(0x4900a000),
 246         .sdrc   = OMAP2_IO_ADDRESS(OMAP243X_SDRC_BASE),
 247         .sms    = OMAP2_IO_ADDRESS(OMAP243X_SMS_BASE),
 248         .ctrl   = OMAP2_IO_ADDRESS(OMAP243X_CTRL_BASE),
 249         .prm    = OMAP2_IO_ADDRESS(OMAP2430_PRM_BASE),
 250         .cm     = OMAP2_IO_ADDRESS(OMAP2430_CM_BASE),
 251 };
 252
 253 void __init omap2_set_globals_243x(void)
 254 {
 255         __omap2_set_globals(&omap243x_globals);
 256 }
 257 #endif
 258
 259 #if defined(CONFIG_ARCH_OMAP3430)
 260
 261 static struct omap_globals omap343x_globals = {
 262         .class  = OMAP343X_CLASS,
 263         .tap    = OMAP2_IO_ADDRESS(0x4830A000),
 264         .sdrc   = OMAP2_IO_ADDRESS(OMAP343X_SDRC_BASE),
 265         .sms    = OMAP2_IO_ADDRESS(OMAP343X_SMS_BASE),
 266         .ctrl   = OMAP2_IO_ADDRESS(OMAP343X_CTRL_BASE),
 267         .prm    = OMAP2_IO_ADDRESS(OMAP3430_PRM_BASE),
 268         .cm     = OMAP2_IO_ADDRESS(OMAP3430_CM_BASE),
 269 };
 270
 271 void __init omap2_set_globals_343x(void)
 272 {
 273         __omap2_set_globals(&omap343x_globals);
 274 }
 275 #endif
 276
 277 #if defined(CONFIG_ARCH_OMAP4)
 278 static struct omap_globals omap4_globals = {
 279         .class  = OMAP443X_CLASS,
 280         .tap    = OMAP2_IO_ADDRESS(0x4830a000),
 281         .ctrl   = OMAP2_IO_ADDRESS(OMAP443X_CTRL_BASE),
 282         .prm    = OMAP2_IO_ADDRESS(OMAP4430_PRM_BASE),
 283         .cm     = OMAP2_IO_ADDRESS(OMAP4430_CM_BASE),
 284 };
 285
 286 void __init omap2_set_globals_443x(void)
 287 {
 288         omap2_set_globals_tap(&omap4_globals);
 289         omap2_set_globals_control(&omap4_globals);
 290 }
 291 #endif
 292