arch/arm/plat-omap/sram.c

   1 /*
   2  * linux/arch/arm/plat-omap/sram.c
   3  *
   4  * OMAP SRAM detection and management
   5  *
   6  * Copyright (C) 2005 Nokia Corporation
   7  * Written by Tony Lindgren <tony@atomide.com>
   8  *
   9  * Copyright (C) 2009 Texas Instruments
  10  * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  */
  16 #undef DEBUG
  17
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/io.h>
  22
  23 #include <asm/tlb.h>
  24 #include <asm/cacheflush.h>
  25
  26 #include <asm/mach/map.h>
  27
  28 #include <plat/sram.h>
  29 #include <plat/board.h>
  30 #include <plat/cpu.h>
  31 #include <plat/vram.h>
  32
  33 #include <plat/control.h>
  34
  35 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
  36 # include "../mach-omap2/prm.h"
  37 # include "../mach-omap2/cm.h"
  38 # include "../mach-omap2/sdrc.h"
  39 #endif
  40
  41 #define OMAP1_SRAM_PA           0x20000000
  42 #define OMAP1_SRAM_VA           VMALLOC_END
  43 #define OMAP2_SRAM_PA           0x40200000
  44 #define OMAP2_SRAM_PUB_PA       0x4020f800
  45 #define OMAP2_SRAM_VA           0xfe400000
  46 #define OMAP2_SRAM_PUB_VA       (OMAP2_SRAM_VA + 0x800)
  47 #define OMAP3_SRAM_PA           0x40200000
  48 #define OMAP3_SRAM_VA           0xfe400000
  49 #define OMAP3_SRAM_PUB_PA       0x40208000
  50 #define OMAP3_SRAM_PUB_VA       (OMAP3_SRAM_VA + 0x8000)
  51 #define OMAP4_SRAM_PA           0x40300000
  52 #define OMAP4_SRAM_VA           0xfe400000
  53 #define OMAP4_SRAM_PUB_PA       (OMAP4_SRAM_PA + 0x4000)
  54 #define OMAP4_SRAM_PUB_VA       (OMAP4_SRAM_VA + 0x4000)
  55
  56 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
  57 #define SRAM_BOOTLOADER_SZ      0x00
  58 #else
  59 #define SRAM_BOOTLOADER_SZ      0x80
  60 #endif
  61
  62 #define OMAP24XX_VA_REQINFOPERM0        OMAP2_L3_IO_ADDRESS(0x68005048)
  63 #define OMAP24XX_VA_READPERM0           OMAP2_L3_IO_ADDRESS(0x68005050)
  64 #define OMAP24XX_VA_WRITEPERM0          OMAP2_L3_IO_ADDRESS(0x68005058)
  65
  66 #define OMAP34XX_VA_REQINFOPERM0        OMAP2_L3_IO_ADDRESS(0x68012848)
  67 #define OMAP34XX_VA_READPERM0           OMAP2_L3_IO_ADDRESS(0x68012850)
  68 #define OMAP34XX_VA_WRITEPERM0          OMAP2_L3_IO_ADDRESS(0x68012858)
  69 #define OMAP34XX_VA_ADDR_MATCH2         OMAP2_L3_IO_ADDRESS(0x68012880)
  70 #define OMAP34XX_VA_SMS_RG_ATT0         OMAP2_L3_IO_ADDRESS(0x6C000048)
  71 #define OMAP34XX_VA_CONTROL_STAT        OMAP2_L4_IO_ADDRESS(0x480022F0)
  72
  73 #define GP_DEVICE               0x300
  74
  75 #define ROUND_DOWN(value,boundary)      ((value) & (~((boundary)-1)))
  76
  77 static unsigned long omap_sram_start;
  78 static unsigned long omap_sram_base;
  79 static unsigned long omap_sram_size;
  80 static unsigned long omap_sram_ceil;
  81
  82 extern unsigned long omapfb_reserve_sram(unsigned long sram_pstart,
  83                                          unsigned long sram_vstart,
  84                                          unsigned long sram_size,
  85                                          unsigned long pstart_avail,
  86                                          unsigned long size_avail);
  87
  88 /*
  89  * Depending on the target RAMFS firewall setup, the public usable amount of
  90  * SRAM varies.  The default accessible size for all device types is 2k. A GP
  91  * device allows ARM11 but not other initiators for full size. This
  92  * functionality seems ok until some nice security API happens.
  93  */
  94 static int is_sram_locked(void)
  95 {
  96         int type = 0;
  97
  98         if (cpu_is_omap44xx())
  99                 /* Not yet supported */
 100                 return 0;
 101
 102         if (cpu_is_omap242x())
 103                 type = omap_rev() & OMAP2_DEVICETYPE_MASK;
 104
 105         if (type == GP_DEVICE) {
 106                 /* RAMFW: R/W access to all initiators for all qualifier sets */
 107                 if (cpu_is_omap242x()) {
 108                         __raw_writel(0xFF, OMAP24XX_VA_REQINFOPERM0); /* all q-vects */
 109                         __raw_writel(0xCFDE, OMAP24XX_VA_READPERM0);  /* all i-read */
 110                         __raw_writel(0xCFDE, OMAP24XX_VA_WRITEPERM0); /* all i-write */
 111                 }
 112                 if (cpu_is_omap34xx()) {
 113                         __raw_writel(0xFFFF, OMAP34XX_VA_REQINFOPERM0); /* all q-vects */
 114                         __raw_writel(0xFFFF, OMAP34XX_VA_READPERM0);  /* all i-read */
 115                         __raw_writel(0xFFFF, OMAP34XX_VA_WRITEPERM0); /* all i-write */
 116                         __raw_writel(0x0, OMAP34XX_VA_ADDR_MATCH2);
 117                         __raw_writel(0xFFFFFFFF, OMAP34XX_VA_SMS_RG_ATT0);
 118                 }
 119                 return 0;
 120         } else
 121                 return 1; /* assume locked with no PPA or security driver */
 122 }
 123
 124 /*
 125  * The amount of SRAM depends on the core type.
 126  * Note that we cannot try to test for SRAM here because writes
 127  * to secure SRAM will hang the system. Also the SRAM is not
 128  * yet mapped at this point.
 129  */
 130 void __init omap_detect_sram(void)
 131 {
 132         unsigned long reserved;
 133
 134         if (cpu_class_is_omap2()) {
 135                 if (is_sram_locked()) {
 136                         if (cpu_is_omap34xx()) {
 137                                 omap_sram_base = OMAP3_SRAM_PUB_VA;
 138                                 omap_sram_start = OMAP3_SRAM_PUB_PA;
 139                                 if ((omap_type() == OMAP2_DEVICE_TYPE_EMU) ||
 140                                     (omap_type() == OMAP2_DEVICE_TYPE_SEC)) {
 141                                         omap_sram_size = 0x7000; /* 28K */
 142                                 } else {
 143                                         omap_sram_size = 0x8000; /* 32K */
 144                                 }
 145                         } else if (cpu_is_omap44xx()) {
 146                                 omap_sram_base = OMAP4_SRAM_PUB_VA;
 147                                 omap_sram_start = OMAP4_SRAM_PUB_PA;
 148                                 omap_sram_size = 0xa000; /* 40K */
 149                         } else {
 150                                 omap_sram_base = OMAP2_SRAM_PUB_VA;
 151                                 omap_sram_start = OMAP2_SRAM_PUB_PA;
 152                                 omap_sram_size = 0x800; /* 2K */
 153                         }
 154                 } else {
 155                         if (cpu_is_omap34xx()) {
 156                                 omap_sram_base = OMAP3_SRAM_VA;
 157                                 omap_sram_start = OMAP3_SRAM_PA;
 158                                 omap_sram_size = 0x10000; /* 64K */
 159                         } else if (cpu_is_omap44xx()) {
 160                                 omap_sram_base = OMAP4_SRAM_VA;
 161                                 omap_sram_start = OMAP4_SRAM_PA;
 162                                 omap_sram_size = 0xe000; /* 56K */
 163                         } else {
 164                                 omap_sram_base = OMAP2_SRAM_VA;
 165                                 omap_sram_start = OMAP2_SRAM_PA;
 166                                 if (cpu_is_omap242x())
 167                                         omap_sram_size = 0xa0000; /* 640K */
 168                                 else if (cpu_is_omap243x())
 169                                         omap_sram_size = 0x10000; /* 64K */
 170                         }
 171                 }
 172         } else {
 173                 omap_sram_base = OMAP1_SRAM_VA;
 174                 omap_sram_start = OMAP1_SRAM_PA;
 175
 176                 if (cpu_is_omap7xx())
 177                         omap_sram_size = 0x32000;       /* 200K */
 178                 else if (cpu_is_omap15xx())
 179                         omap_sram_size = 0x30000;       /* 192K */
 180                 else if (cpu_is_omap1610() || cpu_is_omap1621() ||
 181                      cpu_is_omap1710())
 182                         omap_sram_size = 0x4000;        /* 16K */
 183                 else if (cpu_is_omap1611())
 184                         omap_sram_size = 0x3e800;       /* 250K */
 185                 else {
 186                         printk(KERN_ERR "Could not detect SRAM size\n");
 187                         omap_sram_size = 0x4000;
 188                 }
 189         }
 190         reserved = omapfb_reserve_sram(omap_sram_start, omap_sram_base,
 191                                        omap_sram_size,
 192                                        omap_sram_start + SRAM_BOOTLOADER_SZ,
 193                                        omap_sram_size - SRAM_BOOTLOADER_SZ);
 194         omap_sram_size -= reserved;
 195
 196         reserved = omap_vram_reserve_sram(omap_sram_start, omap_sram_base,
 197                         omap_sram_size,
 198                         omap_sram_start + SRAM_BOOTLOADER_SZ,
 199                         omap_sram_size - SRAM_BOOTLOADER_SZ);
 200         omap_sram_size -= reserved;
 201
 202         omap_sram_ceil = omap_sram_base + omap_sram_size;
 203 }
 204
 205 static struct map_desc omap_sram_io_desc[] __initdata = {
 206         {       /* .length gets filled in at runtime */
 207                 .virtual        = OMAP1_SRAM_VA,
 208                 .pfn            = __phys_to_pfn(OMAP1_SRAM_PA),
 209                 .type           = MT_MEMORY
 210         }
 211 };
 212
 213 /*
 214  * Note that we cannot use ioremap for SRAM, as clock init needs SRAM early.
 215  */
 216 void __init omap_map_sram(void)
 217 {
 218         unsigned long base;
 219
 220         if (omap_sram_size == 0)
 221                 return;
 222
 223         if (cpu_is_omap34xx()) {
 224                 /*
 225                  * SRAM must be marked as non-cached on OMAP3 since the
 226                  * CORE DPLL M2 divider change code (in SRAM) runs with the
 227                  * SDRAM controller disabled, and if it is marked cached,
 228                  * the ARM may attempt to write cache lines back to SDRAM
 229                  * which will cause the system to hang.
 230                  */
 231                 omap_sram_io_desc[0].type = MT_MEMORY_NONCACHED;
 232         }
 233
 234         omap_sram_io_desc[0].virtual = omap_sram_base;
 235         base = omap_sram_start;
 236         base = ROUND_DOWN(base, PAGE_SIZE);
 237         omap_sram_io_desc[0].pfn = __phys_to_pfn(base);
 238         omap_sram_io_desc[0].length = ROUND_DOWN(omap_sram_size, PAGE_SIZE);
 239         iotable_init(omap_sram_io_desc, ARRAY_SIZE(omap_sram_io_desc));
 240
 241         printk(KERN_INFO "SRAM: Mapped pa 0x%08lx to va 0x%08lx size: 0x%lx\n",
 242         __pfn_to_phys(omap_sram_io_desc[0].pfn),
 243         omap_sram_io_desc[0].virtual,
 244                omap_sram_io_desc[0].length);
 245
 246         /*
 247          * Normally devicemaps_init() would flush caches and tlb after
 248          * mdesc->map_io(), but since we're called from map_io(), we
 249          * must do it here.
 250          */
 251         local_flush_tlb_all();
 252         flush_cache_all();
 253
 254         /*
 255          * Looks like we need to preserve some bootloader code at the
 256          * beginning of SRAM for jumping to flash for reboot to work...
 257          */
 258         memset((void *)omap_sram_base + SRAM_BOOTLOADER_SZ, 0,
 259                omap_sram_size - SRAM_BOOTLOADER_SZ);
 260 }
 261
 262 void * omap_sram_push(void * start, unsigned long size)
 263 {
 264         if (size > (omap_sram_ceil - (omap_sram_base + SRAM_BOOTLOADER_SZ))) {
 265                 printk(KERN_ERR "Not enough space in SRAM\n");
 266                 return NULL;
 267         }
 268
 269         omap_sram_ceil -= size;
 270         omap_sram_ceil = ROUND_DOWN(omap_sram_ceil, sizeof(void *));
 271         memcpy((void *)omap_sram_ceil, start, size);
 272         flush_icache_range((unsigned long)omap_sram_ceil,
 273                 (unsigned long)(omap_sram_ceil + size));
 274
 275         return (void *)omap_sram_ceil;
 276 }
 277
 278 #ifdef CONFIG_ARCH_OMAP1
 279
 280 static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl);
 281
 282 void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl)
 283 {
 284         BUG_ON(!_omap_sram_reprogram_clock);
 285         _omap_sram_reprogram_clock(dpllctl, ckctl);
 286 }
 287
 288 int __init omap1_sram_init(void)
 289 {
 290         _omap_sram_reprogram_clock =
 291                         omap_sram_push(omap1_sram_reprogram_clock,
 292                                         omap1_sram_reprogram_clock_sz);
 293
 294         return 0;
 295 }
 296
 297 #else
 298 #define omap1_sram_init()       do {} while (0)
 299 #endif
 300
 301 #if defined(CONFIG_ARCH_OMAP2)
 302
 303 static void (*_omap2_sram_ddr_init)(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
 304                               u32 base_cs, u32 force_unlock);
 305
 306 void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
 307                    u32 base_cs, u32 force_unlock)
 308 {
 309         BUG_ON(!_omap2_sram_ddr_init);
 310         _omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl,
 311                              base_cs, force_unlock);
 312 }
 313
 314 static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val,
 315                                           u32 mem_type);
 316
 317 void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type)
 318 {
 319         BUG_ON(!_omap2_sram_reprogram_sdrc);
 320         _omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type);
 321 }
 322
 323 static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);
 324
 325 u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass)
 326 {
 327         BUG_ON(!_omap2_set_prcm);
 328         return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass);
 329 }
 330 #endif
 331
 332 #ifdef CONFIG_ARCH_OMAP2420
 333 int __init omap242x_sram_init(void)
 334 {
 335         _omap2_sram_ddr_init = omap_sram_push(omap242x_sram_ddr_init,
 336                                         omap242x_sram_ddr_init_sz);
 337
 338         _omap2_sram_reprogram_sdrc = omap_sram_push(omap242x_sram_reprogram_sdrc,
 339                                             omap242x_sram_reprogram_sdrc_sz);
 340
 341         _omap2_set_prcm = omap_sram_push(omap242x_sram_set_prcm,
 342                                          omap242x_sram_set_prcm_sz);
 343
 344         return 0;
 345 }
 346 #else
 347 static inline int omap242x_sram_init(void)
 348 {
 349         return 0;
 350 }
 351 #endif
 352
 353 #ifdef CONFIG_ARCH_OMAP2430
 354 int __init omap243x_sram_init(void)
 355 {
 356         _omap2_sram_ddr_init = omap_sram_push(omap243x_sram_ddr_init,
 357                                         omap243x_sram_ddr_init_sz);
 358
 359         _omap2_sram_reprogram_sdrc = omap_sram_push(omap243x_sram_reprogram_sdrc,
 360                                             omap243x_sram_reprogram_sdrc_sz);
 361
 362         _omap2_set_prcm = omap_sram_push(omap243x_sram_set_prcm,
 363                                          omap243x_sram_set_prcm_sz);
 364
 365         return 0;
 366 }
 367 #else
 368 static inline int omap243x_sram_init(void)
 369 {
 370         return 0;
 371 }
 372 #endif
 373
 374 #ifdef CONFIG_ARCH_OMAP3
 375
 376 static u32 (*_omap3_sram_configure_core_dpll)(
 377                         u32 m2, u32 unlock_dll, u32 f, u32 inc,
 378                         u32 sdrc_rfr_ctrl_0, u32 sdrc_actim_ctrl_a_0,
 379                         u32 sdrc_actim_ctrl_b_0, u32 sdrc_mr_0,
 380                         u32 sdrc_rfr_ctrl_1, u32 sdrc_actim_ctrl_a_1,
 381                         u32 sdrc_actim_ctrl_b_1, u32 sdrc_mr_1);
 382
 383 u32 omap3_configure_core_dpll(u32 m2, u32 unlock_dll, u32 f, u32 inc,
 384                         u32 sdrc_rfr_ctrl_0, u32 sdrc_actim_ctrl_a_0,
 385                         u32 sdrc_actim_ctrl_b_0, u32 sdrc_mr_0,
 386                         u32 sdrc_rfr_ctrl_1, u32 sdrc_actim_ctrl_a_1,
 387                         u32 sdrc_actim_ctrl_b_1, u32 sdrc_mr_1)
 388 {
 389         BUG_ON(!_omap3_sram_configure_core_dpll);
 390         return _omap3_sram_configure_core_dpll(
 391                         m2, unlock_dll, f, inc,
 392                         sdrc_rfr_ctrl_0, sdrc_actim_ctrl_a_0,
 393                         sdrc_actim_ctrl_b_0, sdrc_mr_0,
 394                         sdrc_rfr_ctrl_1, sdrc_actim_ctrl_a_1,
 395                         sdrc_actim_ctrl_b_1, sdrc_mr_1);
 396 }
 397
 398 #ifdef CONFIG_PM
 399 void omap3_sram_restore_context(void)
 400 {
 401         omap_sram_ceil = omap_sram_base + omap_sram_size;
 402
 403         _omap3_sram_configure_core_dpll =
 404                 omap_sram_push(omap3_sram_configure_core_dpll,
 405                                omap3_sram_configure_core_dpll_sz);
 406         omap_push_sram_idle();
 407 }
 408 #endif /* CONFIG_PM */
 409
 410 int __init omap34xx_sram_init(void)
 411 {
 412         _omap3_sram_configure_core_dpll =
 413                 omap_sram_push(omap3_sram_configure_core_dpll,
 414                                omap3_sram_configure_core_dpll_sz);
 415         omap_push_sram_idle();
 416         return 0;
 417 }
 418 #else
 419 static inline int omap34xx_sram_init(void)
 420 {
 421         return 0;
 422 }
 423 #endif
 424
 425 #ifdef CONFIG_ARCH_OMAP4
 426 int __init omap44xx_sram_init(void)
 427 {
 428         printk(KERN_ERR "FIXME: %s not implemented\n", __func__);
 429
 430         return -ENODEV;
 431 }
 432 #else
 433 static inline int omap44xx_sram_init(void)
 434 {
 435         return 0;
 436 }
 437 #endif
 438
 439 int __init omap_sram_init(void)
 440 {
 441         omap_detect_sram();
 442         omap_map_sram();
 443
 444         if (!(cpu_class_is_omap2()))
 445                 omap1_sram_init();
 446         else if (cpu_is_omap242x())
 447                 omap242x_sram_init();
 448         else if (cpu_is_omap2430())
 449                 omap243x_sram_init();
 450         else if (cpu_is_omap34xx())
 451                 omap34xx_sram_init();
 452         else if (cpu_is_omap44xx())
 453                 omap44xx_sram_init();
 454
 455         return 0;
 456 }