arch/arm/plat-omap/common.c

   1 /*
   2  * linux/arch/arm/plat-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/module.h>
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/delay.h>
  14 #include <linux/pm.h>
  15 #include <linux/console.h>
  16 #include <linux/serial.h>
  17 #include <linux/tty.h>
  18 #include <linux/serial_8250.h>
  19 #include <linux/serial_reg.h>
  20 #include <linux/clk.h>
  21 #include <linux/io.h>
  22
  23 #include <mach/hardware.h>
  24 #include <asm/system.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/mach/map.h>
  27 #include <asm/setup.h>
  28
  29 #include <mach/common.h>
  30 #include <mach/board.h>
  31 #include <mach/control.h>
  32 #include <mach/mux.h>
  33 #include <mach/fpga.h>
  34
  35 #include <mach/clock.h>
  36
  37 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
  38 # include "../mach-omap2/sdrc.h"
  39 #endif
  40
  41 #define NO_LENGTH_CHECK 0xffffffff
  42
  43 unsigned char omap_bootloader_tag[512];
  44 int omap_bootloader_tag_len;
  45
  46 struct omap_board_config_kernel *omap_board_config;
  47 int omap_board_config_size;
  48
  49 static const void *get_config(u16 tag, size_t len, int skip, size_t *len_out)
  50 {
  51         struct omap_board_config_kernel *kinfo = NULL;
  52         int i;
  53
  54 #ifdef CONFIG_OMAP_BOOT_TAG
  55         struct omap_board_config_entry *info = NULL;
  56
  57         if (omap_bootloader_tag_len > 4)
  58                 info = (struct omap_board_config_entry *) omap_bootloader_tag;
  59         while (info != NULL) {
  60                 u8 *next;
  61
  62                 if (info->tag == tag) {
  63                         if (skip == 0)
  64                                 break;
  65                         skip--;
  66                 }
  67
  68                 if ((info->len & 0x03) != 0) {
  69                         /* We bail out to avoid an alignment fault */
  70                         printk(KERN_ERR "OMAP peripheral config: Length (%d) not word-aligned (tag %04x)\n",
  71                                info->len, info->tag);
  72                         return NULL;
  73                 }
  74                 next = (u8 *) info + sizeof(*info) + info->len;
  75                 if (next >= omap_bootloader_tag + omap_bootloader_tag_len)
  76                         info = NULL;
  77                 else
  78                         info = (struct omap_board_config_entry *) next;
  79         }
  80         if (info != NULL) {
  81                 /* Check the length as a lame attempt to check for
  82                  * binary inconsistency. */
  83                 if (len != NO_LENGTH_CHECK) {
  84                         /* Word-align len */
  85                         if (len & 0x03)
  86                                 len = (len + 3) & ~0x03;
  87                         if (info->len != len) {
  88                                 printk(KERN_ERR "OMAP peripheral config: Length mismatch with tag %x (want %d, got %d)\n",
  89                                        tag, len, info->len);
  90                                 return NULL;
  91                         }
  92                 }
  93                 if (len_out != NULL)
  94                         *len_out = info->len;
  95                 return info->data;
  96         }
  97 #endif
  98         /* Try to find the config from the board-specific structures
  99          * in the kernel. */
 100         for (i = 0; i < omap_board_config_size; i++) {
 101                 if (omap_board_config[i].tag == tag) {
 102                         if (skip == 0) {
 103                                 kinfo = &omap_board_config[i];
 104                                 break;
 105                         } else {
 106                                 skip--;
 107                         }
 108                 }
 109         }
 110         if (kinfo == NULL)
 111                 return NULL;
 112         return kinfo->data;
 113 }
 114
 115 const void *__omap_get_config(u16 tag, size_t len, int nr)
 116 {
 117         return get_config(tag, len, nr, NULL);
 118 }
 119 EXPORT_SYMBOL(__omap_get_config);
 120
 121 const void *omap_get_var_config(u16 tag, size_t *len)
 122 {
 123         return get_config(tag, NO_LENGTH_CHECK, 0, len);
 124 }
 125 EXPORT_SYMBOL(omap_get_var_config);
 126
 127 static int __init omap_add_serial_console(void)
 128 {
 129         const struct omap_serial_console_config *con_info;
 130         const struct omap_uart_config *uart_info;
 131         static char speed[11], *opt = NULL;
 132         int line, i, uart_idx;
 133
 134         uart_info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config);
 135         con_info = omap_get_config(OMAP_TAG_SERIAL_CONSOLE,
 136                                         struct omap_serial_console_config);
 137         if (uart_info == NULL || con_info == NULL)
 138                 return 0;
 139
 140         if (con_info->console_uart == 0)
 141                 return 0;
 142
 143         if (con_info->console_speed) {
 144                 snprintf(speed, sizeof(speed), "%u", con_info->console_speed);
 145                 opt = speed;
 146         }
 147
 148         uart_idx = con_info->console_uart - 1;
 149         if (uart_idx >= OMAP_MAX_NR_PORTS) {
 150                 printk(KERN_INFO "Console: external UART#%d. "
 151                         "Not adding it as console this time.\n",
 152                         uart_idx + 1);
 153                 return 0;
 154         }
 155         if (!(uart_info->enabled_uarts & (1 << uart_idx))) {
 156                 printk(KERN_ERR "Console: Selected UART#%d is "
 157                         "not enabled for this platform\n",
 158                         uart_idx + 1);
 159                 return -1;
 160         }
 161         line = 0;
 162         for (i = 0; i < uart_idx; i++) {
 163                 if (uart_info->enabled_uarts & (1 << i))
 164                         line++;
 165         }
 166         return add_preferred_console("ttyS", line, opt);
 167 }
 168 console_initcall(omap_add_serial_console);
 169
 170
 171 /*
 172  * 32KHz clocksource ... always available, on pretty most chips except
 173  * OMAP 730 and 1510.  Other timers could be used as clocksources, with
 174  * higher resolution in free-running counter modes (e.g. 12 MHz xtal),
 175  * but systems won't necessarily want to spend resources that way.
 176  */
 177
 178 #if defined(CONFIG_ARCH_OMAP16XX)
 179 #define TIMER_32K_SYNCHRONIZED          0xfffbc410
 180 #elif defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX)
 181 #define TIMER_32K_SYNCHRONIZED          (OMAP2_32KSYNCT_BASE + 0x10)
 182 #endif
 183
 184 #ifdef  TIMER_32K_SYNCHRONIZED
 185
 186 #include <linux/clocksource.h>
 187
 188 static cycle_t omap_32k_read(void)
 189 {
 190         return omap_readl(TIMER_32K_SYNCHRONIZED);
 191 }
 192
 193 static struct clocksource clocksource_32k = {
 194         .name           = "32k_counter",
 195         .rating         = 250,
 196         .read           = omap_32k_read,
 197         .mask           = CLOCKSOURCE_MASK(32),
 198         .shift          = 10,
 199         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 200 };
 201
 202 /*
 203  * Returns current time from boot in nsecs. It's OK for this to wrap
 204  * around for now, as it's just a relative time stamp.
 205  */
 206 unsigned long long sched_clock(void)
 207 {
 208         unsigned long long ret;
 209
 210         ret = (unsigned long long)omap_32k_read();
 211         ret = (ret * clocksource_32k.mult_orig) >> clocksource_32k.shift;
 212         return ret;
 213 }
 214
 215 static int __init omap_init_clocksource_32k(void)
 216 {
 217         static char err[] __initdata = KERN_ERR
 218                         "%s: can't register clocksource!\n";
 219
 220         if (cpu_is_omap16xx() || cpu_class_is_omap2()) {
 221                 struct clk *sync_32k_ick;
 222
 223                 sync_32k_ick = clk_get(NULL, "omap_32ksync_ick");
 224                 if (sync_32k_ick)
 225                         clk_enable(sync_32k_ick);
 226
 227                 clocksource_32k.mult = clocksource_hz2mult(32768,
 228                                             clocksource_32k.shift);
 229
 230                 if (clocksource_register(&clocksource_32k))
 231                         printk(err, clocksource_32k.name);
 232         }
 233         return 0;
 234 }
 235 arch_initcall(omap_init_clocksource_32k);
 236
 237 #endif  /* TIMER_32K_SYNCHRONIZED */
 238
 239 /* Global address base setup code */
 240
 241 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
 242
 243 static struct omap_globals *omap2_globals;
 244
 245 static void __init __omap2_set_globals(void)
 246 {
 247         omap2_set_globals_tap(omap2_globals);
 248         omap2_set_globals_sdrc(omap2_globals);
 249         omap2_set_globals_control(omap2_globals);
 250         omap2_set_globals_prcm(omap2_globals);
 251 }
 252
 253 #endif
 254
 255 #if defined(CONFIG_ARCH_OMAP2420)
 256
 257 static struct omap_globals omap242x_globals = {
 258         .class  = OMAP242X_CLASS,
 259         .tap    = OMAP2_IO_ADDRESS(0x48014000),
 260         .sdrc   = OMAP2_IO_ADDRESS(OMAP2420_SDRC_BASE),
 261         .sms    = OMAP2_IO_ADDRESS(OMAP2420_SMS_BASE),
 262         .ctrl   = OMAP2_IO_ADDRESS(OMAP2420_CTRL_BASE),
 263         .prm    = OMAP2_IO_ADDRESS(OMAP2420_PRM_BASE),
 264         .cm     = OMAP2_IO_ADDRESS(OMAP2420_CM_BASE),
 265 };
 266
 267 void __init omap2_set_globals_242x(void)
 268 {
 269         omap2_globals = &omap242x_globals;
 270         __omap2_set_globals();
 271 }
 272 #endif
 273
 274 #if defined(CONFIG_ARCH_OMAP2430)
 275
 276 static struct omap_globals omap243x_globals = {
 277         .class  = OMAP243X_CLASS,
 278         .tap    = OMAP2_IO_ADDRESS(0x4900a000),
 279         .sdrc   = OMAP2_IO_ADDRESS(OMAP243X_SDRC_BASE),
 280         .sms    = OMAP2_IO_ADDRESS(OMAP243X_SMS_BASE),
 281         .ctrl   = OMAP2_IO_ADDRESS(OMAP243X_CTRL_BASE),
 282         .prm    = OMAP2_IO_ADDRESS(OMAP2430_PRM_BASE),
 283         .cm     = OMAP2_IO_ADDRESS(OMAP2430_CM_BASE),
 284 };
 285
 286 void __init omap2_set_globals_243x(void)
 287 {
 288         omap2_globals = &omap243x_globals;
 289         __omap2_set_globals();
 290 }
 291 #endif
 292
 293 #if defined(CONFIG_ARCH_OMAP3430)
 294
 295 static struct omap_globals omap343x_globals = {
 296         .class  = OMAP343X_CLASS,
 297         .tap    = OMAP2_IO_ADDRESS(0x4830A000),
 298         .sdrc   = OMAP2_IO_ADDRESS(OMAP343X_SDRC_BASE),
 299         .sms    = OMAP2_IO_ADDRESS(OMAP343X_SMS_BASE),
 300         .ctrl   = OMAP2_IO_ADDRESS(OMAP343X_CTRL_BASE),
 301         .prm    = OMAP2_IO_ADDRESS(OMAP3430_PRM_BASE),
 302         .cm     = OMAP2_IO_ADDRESS(OMAP3430_CM_BASE),
 303 };
 304
 305 void __init omap2_set_globals_343x(void)
 306 {
 307         omap2_globals = &omap343x_globals;
 308         __omap2_set_globals();
 309 }
 310 #endif
 311