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