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
  22 #include <asm/hardware.h>
  23 #include <asm/system.h>
  24 #include <asm/pgtable.h>
  25 #include <asm/mach/map.h>
  26 #include <asm/io.h>
  27 #include <asm/setup.h>
  28
  29 #include <asm/arch/board.h>
  30 #include <asm/arch/control.h>
  31 #include <asm/arch/mux.h>
  32 #include <asm/arch/fpga.h>
  33
  34 #include <asm/arch/clock.h>
  35
  36 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
  37 # include "../mach-omap2/sdrc.h"
  38 #endif
  39
  40 #define NO_LENGTH_CHECK 0xffffffff
  41
  42 unsigned char omap_bootloader_tag[512];
  43 int omap_bootloader_tag_len;
  44
  45 struct omap_board_config_kernel *omap_board_config;
  46 int omap_board_config_size;
  47
  48 static const void *get_config(u16 tag, size_t len, int skip, size_t *len_out)
  49 {
  50         struct omap_board_config_kernel *kinfo = NULL;
  51         int i;
  52
  53 #ifdef CONFIG_OMAP_BOOT_TAG
  54         struct omap_board_config_entry *info = NULL;
  55
  56         if (omap_bootloader_tag_len > 4)
  57                 info = (struct omap_board_config_entry *) omap_bootloader_tag;
  58         while (info != NULL) {
  59                 u8 *next;
  60
  61                 if (info->tag == tag) {
  62                         if (skip == 0)
  63                                 break;
  64                         skip--;
  65                 }
  66
  67                 if ((info->len & 0x03) != 0) {
  68                         /* We bail out to avoid an alignment fault */
  69                         printk(KERN_ERR "OMAP peripheral config: Length (%d) not word-aligned (tag %04x)\n",
  70                                info->len, info->tag);
  71                         return NULL;
  72                 }
  73                 next = (u8 *) info + sizeof(*info) + info->len;
  74                 if (next >= omap_bootloader_tag + omap_bootloader_tag_len)
  75                         info = NULL;
  76                 else
  77                         info = (struct omap_board_config_entry *) next;
  78         }
  79         if (info != NULL) {
  80                 /* Check the length as a lame attempt to check for
  81                  * binary inconsistency. */
  82                 if (len != NO_LENGTH_CHECK) {
  83                         /* Word-align len */
  84                         if (len & 0x03)
  85                                 len = (len + 3) & ~0x03;
  86                         if (info->len != len) {
  87                                 printk(KERN_ERR "OMAP peripheral config: Length mismatch with tag %x (want %d, got %d)\n",
  88                                        tag, len, info->len);
  89                                 return NULL;
  90                         }
  91                 }
  92                 if (len_out != NULL)
  93                         *len_out = info->len;
  94                 return info->data;
  95         }
  96 #endif
  97         /* Try to find the config from the board-specific structures
  98          * in the kernel. */
  99         for (i = 0; i < omap_board_config_size; i++) {
 100                 if (omap_board_config[i].tag == tag) {
 101                         if (skip == 0) {
 102                                 kinfo = &omap_board_config[i];
 103                                 break;
 104                         } else {
 105                                 skip--;
 106                         }
 107                 }
 108         }
 109         if (kinfo == NULL)
 110                 return NULL;
 111         return kinfo->data;
 112 }
 113
 114 const void *__omap_get_config(u16 tag, size_t len, int nr)
 115 {
 116         return get_config(tag, len, nr, NULL);
 117 }
 118 EXPORT_SYMBOL(__omap_get_config);
 119
 120 const void *omap_get_var_config(u16 tag, size_t *len)
 121 {
 122         return get_config(tag, NO_LENGTH_CHECK, 0, len);
 123 }
 124 EXPORT_SYMBOL(omap_get_var_config);
 125
 126 static int __init omap_add_serial_console(void)
 127 {
 128         const struct omap_serial_console_config *con_info;
 129         const struct omap_uart_config *uart_info;
 130         static char speed[11], *opt = NULL;
 131         int line, i, uart_idx;
 132
 133         uart_info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config);
 134         con_info = omap_get_config(OMAP_TAG_SERIAL_CONSOLE,
 135                                         struct omap_serial_console_config);
 136         if (uart_info == NULL || con_info == NULL)
 137                 return 0;
 138
 139         if (con_info->console_uart == 0)
 140                 return 0;
 141
 142         if (con_info->console_speed) {
 143                 snprintf(speed, sizeof(speed), "%u", con_info->console_speed);
 144                 opt = speed;
 145         }
 146
 147         uart_idx = con_info->console_uart - 1;
 148         if (uart_idx >= OMAP_MAX_NR_PORTS) {
 149                 printk(KERN_INFO "Console: external UART#%d. "
 150                         "Not adding it as console this time.\n",
 151                         uart_idx + 1);
 152                 return 0;
 153         }
 154         if (!(uart_info->enabled_uarts & (1 << uart_idx))) {
 155                 printk(KERN_ERR "Console: Selected UART#%d is "
 156                         "not enabled for this platform\n",
 157                         uart_idx + 1);
 158                 return -1;
 159         }
 160         line = 0;
 161         for (i = 0; i < uart_idx; i++) {
 162                 if (uart_info->enabled_uarts & (1 << i))
 163                         line++;
 164         }
 165         return add_preferred_console("ttyS", line, opt);
 166 }
 167 console_initcall(omap_add_serial_console);
 168
 169
 170 /*
 171  * 32KHz clocksource ... always available, on pretty most chips except
 172  * OMAP 730 and 1510.  Other timers could be used as clocksources, with
 173  * higher resolution in free-running counter modes (e.g. 12 MHz xtal),
 174  * but systems won't necessarily want to spend resources that way.
 175  */
 176
 177 #if defined(CONFIG_ARCH_OMAP16XX)
 178 #define TIMER_32K_SYNCHRONIZED          0xfffbc410
 179 #elif defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX)
 180 #define TIMER_32K_SYNCHRONIZED          (OMAP2_32KSYNCT_BASE + 0x10)
 181 #endif
 182
 183 #ifdef  TIMER_32K_SYNCHRONIZED
 184
 185 #include <linux/clocksource.h>
 186
 187 static cycle_t omap_32k_read(void)
 188 {
 189         return omap_readl(TIMER_32K_SYNCHRONIZED);
 190 }
 191
 192 static struct clocksource clocksource_32k = {
 193         .name           = "32k_counter",
 194         .rating         = 250,
 195         .read           = omap_32k_read,
 196         .mask           = CLOCKSOURCE_MASK(32),
 197         .shift          = 10,
 198         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 199 };
 200
 201 /*
 202  * Rounds down to nearest nsec.
 203  */
 204 unsigned long long omap_32k_ticks_to_nsecs(unsigned long ticks_32k)
 205 {
 206         return cyc2ns(&clocksource_32k, ticks_32k);
 207 }
 208
 209 /*
 210  * Returns current time from boot in nsecs. It's OK for this to wrap
 211  * around for now, as it's just a relative time stamp.
 212  */
 213 unsigned long long sched_clock(void)
 214 {
 215         return omap_32k_ticks_to_nsecs(omap_32k_read());
 216 }
 217
 218 static int __init omap_init_clocksource_32k(void)
 219 {
 220         static char err[] __initdata = KERN_ERR
 221                         "%s: can't register clocksource!\n";
 222
 223         if (cpu_is_omap16xx() || cpu_class_is_omap2()) {
 224                 struct clk *sync_32k_ick;
 225
 226                 sync_32k_ick = clk_get(NULL, "omap_32ksync_ick");
 227                 if (sync_32k_ick)
 228                         clk_enable(sync_32k_ick);
 229
 230                 clocksource_32k.mult = clocksource_hz2mult(32768,
 231                                             clocksource_32k.shift);
 232
 233                 if (clocksource_register(&clocksource_32k))
 234                         printk(err, clocksource_32k.name);
 235         }
 236         return 0;
 237 }
 238 arch_initcall(omap_init_clocksource_32k);
 239
 240 #endif  /* TIMER_32K_SYNCHRONIZED */
 241
 242 /* Global address base setup code */
 243
 244 #if defined(CONFIG_ARCH_OMAP2420)
 245 void __init omap2_set_globals_242x(void)
 246 {
 247         omap2_sdrc_base = OMAP2420_SDRC_BASE;
 248         omap2_sms_base = OMAP2420_SMS_BASE;
 249         omap_ctrl_base_set(OMAP2420_CTRL_BASE);
 250 }
 251 #endif
 252
 253 #if defined(CONFIG_ARCH_OMAP2430)
 254 void __init omap2_set_globals_243x(void)
 255 {
 256         omap2_sdrc_base = OMAP243X_SDRC_BASE;
 257         omap2_sms_base = OMAP243X_SMS_BASE;
 258         omap_ctrl_base_set(OMAP243X_CTRL_BASE);
 259 }
 260 #endif
 261
 262 #if defined(CONFIG_ARCH_OMAP3430)
 263 void __init omap2_set_globals_343x(void)
 264 {
 265         omap2_sdrc_base = OMAP343X_SDRC_BASE;
 266         omap2_sms_base = OMAP343X_SMS_BASE;
 267         omap_ctrl_base_set(OMAP343X_CTRL_BASE);
 268 }
 269 #endif
 270