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/pm.h>
  19 #include <linux/console.h>
  20 #include <linux/serial.h>
  21 #include <linux/tty.h>
  22 #include <linux/serial_8250.h>
  23 #include <linux/serial_reg.h>
  24 #include <linux/clk.h>
  25 #include <linux/io.h>
  26
  27 #include <mach/hardware.h>
  28 #include <asm/system.h>
  29 #include <asm/pgtable.h>
  30 #include <asm/mach/map.h>
  31 #include <asm/setup.h>
  32
  33 #include <mach/common.h>
  34 #include <mach/board.h>
  35 #include <mach/control.h>
  36 #include <mach/mux.h>
  37 #include <mach/fpga.h>
  38
  39 #include <mach/clock.h>
  40
  41 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
  42 # include "../mach-omap2/sdrc.h"
  43 #endif
  44
  45 #define NO_LENGTH_CHECK 0xffffffff
  46
  47 unsigned char omap_bootloader_tag[512];
  48 int omap_bootloader_tag_len;
  49
  50 struct omap_board_config_kernel *omap_board_config;
  51 int omap_board_config_size;
  52
  53 static const void *get_config(u16 tag, size_t len, int skip, size_t *len_out)
  54 {
  55         struct omap_board_config_kernel *kinfo = NULL;
  56         int i;
  57
  58 #ifdef CONFIG_OMAP_BOOT_TAG
  59         struct omap_board_config_entry *info = NULL;
  60
  61         if (omap_bootloader_tag_len > 4)
  62                 info = (struct omap_board_config_entry *) omap_bootloader_tag;
  63         while (info != NULL) {
  64                 u8 *next;
  65
  66                 if (info->tag == tag) {
  67                         if (skip == 0)
  68                                 break;
  69                         skip--;
  70                 }
  71
  72                 if ((info->len & 0x03) != 0) {
  73                         /* We bail out to avoid an alignment fault */
  74                         printk(KERN_ERR "OMAP peripheral config: Length (%d) not word-aligned (tag %04x)\n",
  75                                info->len, info->tag);
  76                         return NULL;
  77                 }
  78                 next = (u8 *) info + sizeof(*info) + info->len;
  79                 if (next >= omap_bootloader_tag + omap_bootloader_tag_len)
  80                         info = NULL;
  81                 else
  82                         info = (struct omap_board_config_entry *) next;
  83         }
  84         if (info != NULL) {
  85                 /* Check the length as a lame attempt to check for
  86                  * binary inconsistency. */
  87                 if (len != NO_LENGTH_CHECK) {
  88                         /* Word-align len */
  89                         if (len & 0x03)
  90                                 len = (len + 3) & ~0x03;
  91                         if (info->len != len) {
  92                                 printk(KERN_ERR "OMAP peripheral config: Length mismatch with tag %x (want %d, got %d)\n",
  93                                        tag, len, info->len);
  94                                 return NULL;
  95                         }
  96                 }
  97                 if (len_out != NULL)
  98                         *len_out = info->len;
  99                 return info->data;
 100         }
 101 #endif
 102         /* Try to find the config from the board-specific structures
 103          * in the kernel. */
 104         for (i = 0; i < omap_board_config_size; i++) {
 105                 if (omap_board_config[i].tag == tag) {
 106                         if (skip == 0) {
 107                                 kinfo = &omap_board_config[i];
 108                                 break;
 109                         } else {
 110                                 skip--;
 111                         }
 112                 }
 113         }
 114         if (kinfo == NULL)
 115                 return NULL;
 116         return kinfo->data;
 117 }
 118
 119 const void *__omap_get_config(u16 tag, size_t len, int nr)
 120 {
 121         return get_config(tag, len, nr, NULL);
 122 }
 123 EXPORT_SYMBOL(__omap_get_config);
 124
 125 const void *omap_get_var_config(u16 tag, size_t *len)
 126 {
 127         return get_config(tag, NO_LENGTH_CHECK, 0, len);
 128 }
 129 EXPORT_SYMBOL(omap_get_var_config);
 130
 131 static int __init omap_add_serial_console(void)
 132 {
 133         const struct omap_serial_console_config *con_info;
 134         const struct omap_uart_config *uart_info;
 135         static char speed[11], *opt = NULL;
 136         int line, i, uart_idx;
 137
 138         uart_info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config);
 139         con_info = omap_get_config(OMAP_TAG_SERIAL_CONSOLE,
 140                                         struct omap_serial_console_config);
 141         if (uart_info == NULL || con_info == NULL)
 142                 return 0;
 143
 144         if (con_info->console_uart == 0)
 145                 return 0;
 146
 147         if (con_info->console_speed) {
 148                 snprintf(speed, sizeof(speed), "%u", con_info->console_speed);
 149                 opt = speed;
 150         }
 151
 152         uart_idx = con_info->console_uart - 1;
 153         if (uart_idx >= OMAP_MAX_NR_PORTS) {
 154                 printk(KERN_INFO "Console: external UART#%d. "
 155                         "Not adding it as console this time.\n",
 156                         uart_idx + 1);
 157                 return 0;
 158         }
 159         if (!(uart_info->enabled_uarts & (1 << uart_idx))) {
 160                 printk(KERN_ERR "Console: Selected UART#%d is "
 161                         "not enabled for this platform\n",
 162                         uart_idx + 1);
 163                 return -1;
 164         }
 165         line = 0;
 166         for (i = 0; i < uart_idx; i++) {
 167                 if (uart_info->enabled_uarts & (1 << i))
 168                         line++;
 169         }
 170         return add_preferred_console("ttyS", line, opt);
 171 }
 172 console_initcall(omap_add_serial_console);
 173
 174
 175 /*
 176  * 32KHz clocksource ... always available, on pretty most chips except
 177  * OMAP 730 and 1510.  Other timers could be used as clocksources, with
 178  * higher resolution in free-running counter modes (e.g. 12 MHz xtal),
 179  * but systems won't necessarily want to spend resources that way.
 180  */
 181
 182 #define OMAP16XX_TIMER_32K_SYNCHRONIZED         0xfffbc410
 183
 184 #if !(defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP15XX))
 185
 186 #include <linux/clocksource.h>
 187
 188 #ifdef CONFIG_ARCH_OMAP16XX
 189 static cycle_t omap16xx_32k_read(struct clocksource *cs)
 190 {
 191         return omap_readl(OMAP16XX_TIMER_32K_SYNCHRONIZED);
 192 }
 193 #else
 194 #define omap16xx_32k_read       NULL
 195 #endif
 196
 197 #ifdef CONFIG_ARCH_OMAP2420
 198 static cycle_t omap2420_32k_read(struct clocksource *cs)
 199 {
 200         return omap_readl(OMAP2420_32KSYNCT_BASE + 0x10);
 201 }
 202 #else
 203 #define omap2420_32k_read       NULL
 204 #endif
 205
 206 #ifdef CONFIG_ARCH_OMAP2430
 207 static cycle_t omap2430_32k_read(struct clocksource *cs)
 208 {
 209         return omap_readl(OMAP2430_32KSYNCT_BASE + 0x10);
 210 }
 211 #else
 212 #define omap2430_32k_read       NULL
 213 #endif
 214
 215 #ifdef CONFIG_ARCH_OMAP34XX
 216 static cycle_t omap34xx_32k_read(struct clocksource *cs)
 217 {
 218         return omap_readl(OMAP3430_32KSYNCT_BASE + 0x10);
 219 }
 220 #else
 221 #define omap34xx_32k_read       NULL
 222 #endif
 223
 224 #ifdef CONFIG_ARCH_OMAP4
 225 static cycle_t omap44xx_32k_read(struct clocksource *cs)
 226 {
 227         return omap_readl(OMAP4430_32KSYNCT_BASE + 0x10);
 228 }
 229 #else
 230 #define omap44xx_32k_read       NULL
 231 #endif
 232
 233 /*
 234  * Kernel assumes that sched_clock can be called early but may not have
 235  * things ready yet.
 236  */
 237 static cycle_t omap_32k_read_dummy(struct clocksource *cs)
 238 {
 239         return 0;
 240 }
 241
 242 static struct clocksource clocksource_32k = {
 243         .name           = "32k_counter",
 244         .rating         = 250,
 245         .read           = omap_32k_read_dummy,
 246         .mask           = CLOCKSOURCE_MASK(32),
 247         .shift          = 10,
 248         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 249 };
 250
 251 /*
 252  * Returns current time from boot in nsecs. It's OK for this to wrap
 253  * around for now, as it's just a relative time stamp.
 254  */
 255 unsigned long long sched_clock(void)
 256 {
 257         unsigned long long ret;
 258
 259         ret = (unsigned long long)clocksource_32k.read(&clocksource_32k);
 260         ret = (ret * clocksource_32k.mult_orig) >> clocksource_32k.shift;
 261         return ret;
 262 }
 263
 264 static int __init omap_init_clocksource_32k(void)
 265 {
 266         static char err[] __initdata = KERN_ERR
 267                         "%s: can't register clocksource!\n";
 268
 269         if (cpu_is_omap16xx() || cpu_class_is_omap2()) {
 270                 struct clk *sync_32k_ick;
 271
 272                 if (cpu_is_omap16xx())
 273                         clocksource_32k.read = omap16xx_32k_read;
 274                 else if (cpu_is_omap2420())
 275                         clocksource_32k.read = omap2420_32k_read;
 276                 else if (cpu_is_omap2430())
 277                         clocksource_32k.read = omap2430_32k_read;
 278                 else if (cpu_is_omap34xx())
 279                         clocksource_32k.read = omap34xx_32k_read;
 280                 else if (cpu_is_omap44xx())
 281                         clocksource_32k.read = omap44xx_32k_read;
 282                 else
 283                         return -ENODEV;
 284
 285                 sync_32k_ick = clk_get(NULL, "omap_32ksync_ick");
 286                 if (sync_32k_ick)
 287                         clk_enable(sync_32k_ick);
 288
 289                 clocksource_32k.mult = clocksource_hz2mult(32768,
 290                                             clocksource_32k.shift);
 291
 292                 if (clocksource_register(&clocksource_32k))
 293                         printk(err, clocksource_32k.name);
 294         }
 295         return 0;
 296 }
 297 arch_initcall(omap_init_clocksource_32k);
 298
 299 #endif  /* !(defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP15XX)) */
 300
 301 /* Global address base setup code */
 302
 303 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
 304
 305 static void __init __omap2_set_globals(struct omap_globals *omap2_globals)
 306 {
 307         omap2_set_globals_tap(omap2_globals);
 308         omap2_set_globals_sdrc(omap2_globals);
 309         omap2_set_globals_control(omap2_globals);
 310         omap2_set_globals_prcm(omap2_globals);
 311 }
 312
 313 #endif
 314
 315 #if defined(CONFIG_ARCH_OMAP2420)
 316
 317 static struct omap_globals omap242x_globals = {
 318         .class  = OMAP242X_CLASS,
 319         .tap    = OMAP2_IO_ADDRESS(0x48014000),
 320         .sdrc   = OMAP2_IO_ADDRESS(OMAP2420_SDRC_BASE),
 321         .sms    = OMAP2_IO_ADDRESS(OMAP2420_SMS_BASE),
 322         .ctrl   = OMAP2_IO_ADDRESS(OMAP2420_CTRL_BASE),
 323         .prm    = OMAP2_IO_ADDRESS(OMAP2420_PRM_BASE),
 324         .cm     = OMAP2_IO_ADDRESS(OMAP2420_CM_BASE),
 325 };
 326
 327 void __init omap2_set_globals_242x(void)
 328 {
 329         __omap2_set_globals(&omap242x_globals);
 330 }
 331 #endif
 332
 333 #if defined(CONFIG_ARCH_OMAP2430)
 334
 335 static struct omap_globals omap243x_globals = {
 336         .class  = OMAP243X_CLASS,
 337         .tap    = OMAP2_IO_ADDRESS(0x4900a000),
 338         .sdrc   = OMAP2_IO_ADDRESS(OMAP243X_SDRC_BASE),
 339         .sms    = OMAP2_IO_ADDRESS(OMAP243X_SMS_BASE),
 340         .ctrl   = OMAP2_IO_ADDRESS(OMAP243X_CTRL_BASE),
 341         .prm    = OMAP2_IO_ADDRESS(OMAP2430_PRM_BASE),
 342         .cm     = OMAP2_IO_ADDRESS(OMAP2430_CM_BASE),
 343 };
 344
 345 void __init omap2_set_globals_243x(void)
 346 {
 347         __omap2_set_globals(&omap243x_globals);
 348 }
 349 #endif
 350
 351 #if defined(CONFIG_ARCH_OMAP3430)
 352
 353 static struct omap_globals omap343x_globals = {
 354         .class  = OMAP343X_CLASS,
 355         .tap    = OMAP2_IO_ADDRESS(0x4830A000),
 356         .sdrc   = OMAP2_IO_ADDRESS(OMAP343X_SDRC_BASE),
 357         .sms    = OMAP2_IO_ADDRESS(OMAP343X_SMS_BASE),
 358         .ctrl   = OMAP2_IO_ADDRESS(OMAP343X_CTRL_BASE),
 359         .prm    = OMAP2_IO_ADDRESS(OMAP3430_PRM_BASE),
 360         .cm     = OMAP2_IO_ADDRESS(OMAP3430_CM_BASE),
 361 };
 362
 363 void __init omap2_set_globals_343x(void)
 364 {
 365         __omap2_set_globals(&omap343x_globals);
 366 }
 367 #endif
 368
 369 #if defined(CONFIG_ARCH_OMAP4)
 370 static struct omap_globals omap4_globals = {
 371         .class  = OMAP443X_CLASS,
 372         .tap    = OMAP2_IO_ADDRESS(0x4830a000),
 373         .ctrl   = OMAP2_IO_ADDRESS(OMAP443X_CTRL_BASE),
 374         .prm    = OMAP2_IO_ADDRESS(OMAP4430_PRM_BASE),
 375         .cm     = OMAP2_IO_ADDRESS(OMAP4430_CM_BASE),
 376 };
 377
 378 void __init omap2_set_globals_443x(void)
 379 {
 380         omap2_set_globals_tap(&omap4_globals);
 381         omap2_set_globals_control(&omap4_globals);
 382 }
 383 #endif
 384