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 <plat/common.h>
  33 #include <plat/board.h>
  34 #include <plat/control.h>
  35 #include <plat/mux.h>
  36 #include <plat/fpga.h>
  37 #include <plat/serial.h>
  38
  39 #include <plat/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 struct omap_board_config_kernel *omap_board_config;
  48 int omap_board_config_size;
  49
  50 static const void *get_config(u16 tag, size_t len, int skip, size_t *len_out)
  51 {
  52         struct omap_board_config_kernel *kinfo = NULL;
  53         int i;
  54
  55         /* Try to find the config from the board-specific structures
  56          * in the kernel. */
  57         for (i = 0; i < omap_board_config_size; i++) {
  58                 if (omap_board_config[i].tag == tag) {
  59                         if (skip == 0) {
  60                                 kinfo = &omap_board_config[i];
  61                                 break;
  62                         } else {
  63                                 skip--;
  64                         }
  65                 }
  66         }
  67         if (kinfo == NULL)
  68                 return NULL;
  69         return kinfo->data;
  70 }
  71
  72 const void *__omap_get_config(u16 tag, size_t len, int nr)
  73 {
  74         return get_config(tag, len, nr, NULL);
  75 }
  76 EXPORT_SYMBOL(__omap_get_config);
  77
  78 const void *omap_get_var_config(u16 tag, size_t *len)
  79 {
  80         return get_config(tag, NO_LENGTH_CHECK, 0, len);
  81 }
  82 EXPORT_SYMBOL(omap_get_var_config);
  83
  84 /*
  85  * 32KHz clocksource ... always available, on pretty most chips except
  86  * OMAP 730 and 1510.  Other timers could be used as clocksources, with
  87  * higher resolution in free-running counter modes (e.g. 12 MHz xtal),
  88  * but systems won't necessarily want to spend resources that way.
  89  */
  90
  91 #define OMAP16XX_TIMER_32K_SYNCHRONIZED         0xfffbc410
  92
  93 #if !(defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP15XX))
  94
  95 #include <linux/clocksource.h>
  96
  97 /*
  98  * offset_32k holds the init time counter value. It is then subtracted
  99  * from every counter read to achieve a counter that counts time from the
 100  * kernel boot (needed for sched_clock()).
 101  */
 102 static u32 offset_32k __read_mostly;
 103
 104 #ifdef CONFIG_ARCH_OMAP16XX
 105 static cycle_t omap16xx_32k_read(struct clocksource *cs)
 106 {
 107         return omap_readl(OMAP16XX_TIMER_32K_SYNCHRONIZED) - offset_32k;
 108 }
 109 #else
 110 #define omap16xx_32k_read       NULL
 111 #endif
 112
 113 #ifdef CONFIG_ARCH_OMAP2420
 114 static cycle_t omap2420_32k_read(struct clocksource *cs)
 115 {
 116         return omap_readl(OMAP2420_32KSYNCT_BASE + 0x10) - offset_32k;
 117 }
 118 #else
 119 #define omap2420_32k_read       NULL
 120 #endif
 121
 122 #ifdef CONFIG_ARCH_OMAP2430
 123 static cycle_t omap2430_32k_read(struct clocksource *cs)
 124 {
 125         return omap_readl(OMAP2430_32KSYNCT_BASE + 0x10) - offset_32k;
 126 }
 127 #else
 128 #define omap2430_32k_read       NULL
 129 #endif
 130
 131 #ifdef CONFIG_ARCH_OMAP3
 132 static cycle_t omap34xx_32k_read(struct clocksource *cs)
 133 {
 134         return omap_readl(OMAP3430_32KSYNCT_BASE + 0x10) - offset_32k;
 135 }
 136 #else
 137 #define omap34xx_32k_read       NULL
 138 #endif
 139
 140 #ifdef CONFIG_ARCH_OMAP4
 141 static cycle_t omap44xx_32k_read(struct clocksource *cs)
 142 {
 143         return omap_readl(OMAP4430_32KSYNCT_BASE + 0x10) - offset_32k;
 144 }
 145 #else
 146 #define omap44xx_32k_read       NULL
 147 #endif
 148
 149 /*
 150  * Kernel assumes that sched_clock can be called early but may not have
 151  * things ready yet.
 152  */
 153 static cycle_t omap_32k_read_dummy(struct clocksource *cs)
 154 {
 155         return 0;
 156 }
 157
 158 static struct clocksource clocksource_32k = {
 159         .name           = "32k_counter",
 160         .rating         = 250,
 161         .read           = omap_32k_read_dummy,
 162         .mask           = CLOCKSOURCE_MASK(32),
 163         .shift          = 10,
 164         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 165 };
 166
 167 /*
 168  * Returns current time from boot in nsecs. It's OK for this to wrap
 169  * around for now, as it's just a relative time stamp.
 170  */
 171 unsigned long long sched_clock(void)
 172 {
 173         return clocksource_cyc2ns(clocksource_32k.read(&clocksource_32k),
 174                                   clocksource_32k.mult, clocksource_32k.shift);
 175 }
 176
 177 /**
 178  * read_persistent_clock -  Return time from a persistent clock.
 179  *
 180  * Reads the time from a source which isn't disabled during PM, the
 181  * 32k sync timer.  Convert the cycles elapsed since last read into
 182  * nsecs and adds to a monotonically increasing timespec.
 183  */
 184 static struct timespec persistent_ts;
 185 static cycles_t cycles, last_cycles;
 186 void read_persistent_clock(struct timespec *ts)
 187 {
 188         unsigned long long nsecs;
 189         cycles_t delta;
 190         struct timespec *tsp = &persistent_ts;
 191
 192         last_cycles = cycles;
 193         cycles = clocksource_32k.read(&clocksource_32k);
 194         delta = cycles - last_cycles;
 195
 196         nsecs = clocksource_cyc2ns(delta,
 197                                    clocksource_32k.mult, clocksource_32k.shift);
 198
 199         timespec_add_ns(tsp, nsecs);
 200         *ts = *tsp;
 201 }
 202
 203 static int __init omap_init_clocksource_32k(void)
 204 {
 205         static char err[] __initdata = KERN_ERR
 206                         "%s: can't register clocksource!\n";
 207
 208         if (cpu_is_omap16xx() || cpu_class_is_omap2()) {
 209                 struct clk *sync_32k_ick;
 210
 211                 if (cpu_is_omap16xx())
 212                         clocksource_32k.read = omap16xx_32k_read;
 213                 else if (cpu_is_omap2420())
 214                         clocksource_32k.read = omap2420_32k_read;
 215                 else if (cpu_is_omap2430())
 216                         clocksource_32k.read = omap2430_32k_read;
 217                 else if (cpu_is_omap34xx())
 218                         clocksource_32k.read = omap34xx_32k_read;
 219                 else if (cpu_is_omap44xx())
 220                         clocksource_32k.read = omap44xx_32k_read;
 221                 else
 222                         return -ENODEV;
 223
 224                 sync_32k_ick = clk_get(NULL, "omap_32ksync_ick");
 225                 if (sync_32k_ick)
 226                         clk_enable(sync_32k_ick);
 227
 228                 clocksource_32k.mult = clocksource_hz2mult(32768,
 229                                             clocksource_32k.shift);
 230
 231                 offset_32k = clocksource_32k.read(&clocksource_32k);
 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  /* !(defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP15XX)) */
 241
 242 /* Global address base setup code */
 243
 244 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
 245
 246 static void __init __omap2_set_globals(struct omap_globals *omap2_globals)
 247 {
 248         omap2_set_globals_tap(omap2_globals);
 249         omap2_set_globals_sdrc(omap2_globals);
 250         omap2_set_globals_control(omap2_globals);
 251         omap2_set_globals_prcm(omap2_globals);
 252         omap2_set_globals_uart(omap2_globals);
 253 }
 254
 255 #endif
 256
 257 #if defined(CONFIG_ARCH_OMAP2420)
 258
 259 static struct omap_globals omap242x_globals = {
 260         .class  = OMAP242X_CLASS,
 261         .tap    = OMAP2_L4_IO_ADDRESS(0x48014000),
 262         .sdrc   = OMAP2420_SDRC_BASE,
 263         .sms    = OMAP2420_SMS_BASE,
 264         .ctrl   = OMAP2420_CTRL_BASE,
 265         .prm    = OMAP2420_PRM_BASE,
 266         .cm     = OMAP2420_CM_BASE,
 267         .uart1_phys     = OMAP2_UART1_BASE,
 268         .uart2_phys     = OMAP2_UART2_BASE,
 269         .uart3_phys     = OMAP2_UART3_BASE,
 270 };
 271
 272 void __init omap2_set_globals_242x(void)
 273 {
 274         __omap2_set_globals(&omap242x_globals);
 275 }
 276 #endif
 277
 278 #if defined(CONFIG_ARCH_OMAP2430)
 279
 280 static struct omap_globals omap243x_globals = {
 281         .class  = OMAP243X_CLASS,
 282         .tap    = OMAP2_L4_IO_ADDRESS(0x4900a000),
 283         .sdrc   = OMAP243X_SDRC_BASE,
 284         .sms    = OMAP243X_SMS_BASE,
 285         .ctrl   = OMAP243X_CTRL_BASE,
 286         .prm    = OMAP2430_PRM_BASE,
 287         .cm     = OMAP2430_CM_BASE,
 288         .uart1_phys     = OMAP2_UART1_BASE,
 289         .uart2_phys     = OMAP2_UART2_BASE,
 290         .uart3_phys     = OMAP2_UART3_BASE,
 291 };
 292
 293 void __init omap2_set_globals_243x(void)
 294 {
 295         __omap2_set_globals(&omap243x_globals);
 296 }
 297 #endif
 298
 299 #if defined(CONFIG_ARCH_OMAP3)
 300
 301 static struct omap_globals omap3_globals = {
 302         .class  = OMAP343X_CLASS,
 303         .tap    = OMAP2_L4_IO_ADDRESS(0x4830A000),
 304         .sdrc   = OMAP343X_SDRC_BASE,
 305         .sms    = OMAP343X_SMS_BASE,
 306         .ctrl   = OMAP343X_CTRL_BASE,
 307         .prm    = OMAP3430_PRM_BASE,
 308         .cm     = OMAP3430_CM_BASE,
 309         .uart1_phys     = OMAP3_UART1_BASE,
 310         .uart2_phys     = OMAP3_UART2_BASE,
 311         .uart3_phys     = OMAP3_UART3_BASE,
 312 };
 313
 314 void __init omap2_set_globals_343x(void)
 315 {
 316         __omap2_set_globals(&omap3_globals);
 317 }
 318
 319 void __init omap2_set_globals_36xx(void)
 320 {
 321         omap3_globals.uart4_phys = OMAP3_UART4_BASE;
 322
 323         __omap2_set_globals(&omap3_globals);
 324 }
 325 #endif
 326
 327 #if defined(CONFIG_ARCH_OMAP4)
 328 static struct omap_globals omap4_globals = {
 329         .class  = OMAP443X_CLASS,
 330         .tap    = OMAP2_L4_IO_ADDRESS(OMAP443X_SCM_BASE),
 331         .ctrl   = OMAP443X_CTRL_BASE,
 332         .prm    = OMAP4430_PRM_BASE,
 333         .cm     = OMAP4430_CM_BASE,
 334         .cm2    = OMAP4430_CM2_BASE,
 335         .uart1_phys     = OMAP4_UART1_BASE,
 336         .uart2_phys     = OMAP4_UART2_BASE,
 337         .uart3_phys     = OMAP4_UART3_BASE,
 338         .uart4_phys     = OMAP4_UART4_BASE,
 339 };
 340
 341 void __init omap2_set_globals_443x(void)
 342 {
 343         omap2_set_globals_tap(&omap4_globals);
 344         omap2_set_globals_control(&omap4_globals);
 345         omap2_set_globals_prcm(&omap4_globals);
 346         omap2_set_globals_uart(&omap4_globals);
 347 }
 348 #endif
 349