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   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  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #undef DEBUG
  14
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18
  19 #include <asm/tlb.h>
  20 #include <asm/io.h>
  21 #include <asm/cacheflush.h>
  22
  23 #include <asm/mach/map.h>
  24
  25 #include <mach/sram.h>
  26 #include <mach/board.h>
  27
  28 #include <mach/control.h>
  29
  30 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
  31 # include "../mach-omap2/prm.h"
  32 # include "../mach-omap2/cm.h"
  33 # include "../mach-omap2/sdrc.h"
  34 #endif
  35
  36 #define OMAP1_SRAM_PA           0x20000000
  37 #define OMAP1_SRAM_VA           VMALLOC_END
  38 #define OMAP2_SRAM_PA           0x40200000
  39 #define OMAP2_SRAM_PUB_PA       0x4020f800
  40 #define OMAP2_SRAM_VA           VMALLOC_END
  41 #define OMAP2_SRAM_PUB_VA       (VMALLOC_END + 0x800)
  42 #define OMAP3_SRAM_PA           0x40200000
  43 #define OMAP3_SRAM_VA           0xd7000000
  44 #define OMAP3_SRAM_PUB_PA       0x40208000
  45 #define OMAP3_SRAM_PUB_VA       0xd7008000
  46
  47 #if defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX)
  48 #define SRAM_BOOTLOADER_SZ      0x00
  49 #else
  50 #define SRAM_BOOTLOADER_SZ      0x80
  51 #endif
  52
  53 #define OMAP24XX_VA_REQINFOPERM0        IO_ADDRESS(0x68005048)
  54 #define OMAP24XX_VA_READPERM0           IO_ADDRESS(0x68005050)
  55 #define OMAP24XX_VA_WRITEPERM0          IO_ADDRESS(0x68005058)
  56
  57 #define OMAP34XX_VA_REQINFOPERM0        IO_ADDRESS(0x68012848)
  58 #define OMAP34XX_VA_READPERM0           IO_ADDRESS(0x68012850)
  59 #define OMAP34XX_VA_WRITEPERM0          IO_ADDRESS(0x68012858)
  60 #define OMAP34XX_VA_ADDR_MATCH2         IO_ADDRESS(0x68012880)
  61 #define OMAP34XX_VA_SMS_RG_ATT0         IO_ADDRESS(0x6C000048)
  62 #define OMAP34XX_VA_CONTROL_STAT        IO_ADDRESS(0x480022F0)
  63
  64 #define GP_DEVICE               0x300
  65
  66 #define ROUND_DOWN(value,boundary)      ((value) & (~((boundary)-1)))
  67
  68 static unsigned long omap_sram_start;
  69 static unsigned long omap_sram_base;
  70 static unsigned long omap_sram_size;
  71 static unsigned long omap_sram_ceil;
  72
  73 extern unsigned long omapfb_reserve_sram(unsigned long sram_pstart,
  74                                          unsigned long sram_vstart,
  75                                          unsigned long sram_size,
  76                                          unsigned long pstart_avail,
  77                                          unsigned long size_avail);
  78
  79 /*
  80  * Depending on the target RAMFS firewall setup, the public usable amount of
  81  * SRAM varies.  The default accessible size for all device types is 2k. A GP
  82  * device allows ARM11 but not other initiators for full size. This
  83  * functionality seems ok until some nice security API happens.
  84  */
  85 static int is_sram_locked(void)
  86 {
  87         int type = 0;
  88
  89         if (cpu_is_omap242x())
  90                 type = system_rev & OMAP2_DEVICETYPE_MASK;
  91
  92         if (type == GP_DEVICE) {
  93                 /* RAMFW: R/W access to all initiators for all qualifier sets */
  94                 if (cpu_is_omap242x()) {
  95                         __raw_writel(0xFF, OMAP24XX_VA_REQINFOPERM0); /* all q-vects */
  96                         __raw_writel(0xCFDE, OMAP24XX_VA_READPERM0);  /* all i-read */
  97                         __raw_writel(0xCFDE, OMAP24XX_VA_WRITEPERM0); /* all i-write */
  98                 }
  99                 if (cpu_is_omap34xx()) {
 100                         __raw_writel(0xFFFF, OMAP34XX_VA_REQINFOPERM0); /* all q-vects */
 101                         __raw_writel(0xFFFF, OMAP34XX_VA_READPERM0);  /* all i-read */
 102                         __raw_writel(0xFFFF, OMAP34XX_VA_WRITEPERM0); /* all i-write */
 103                         __raw_writel(0x0, OMAP34XX_VA_ADDR_MATCH2);
 104                         __raw_writel(0xFFFFFFFF, OMAP34XX_VA_SMS_RG_ATT0);
 105                 }
 106                 return 0;
 107         } else
 108                 return 1; /* assume locked with no PPA or security driver */
 109 }
 110
 111 /*
 112  * The amount of SRAM depends on the core type.
 113  * Note that we cannot try to test for SRAM here because writes
 114  * to secure SRAM will hang the system. Also the SRAM is not
 115  * yet mapped at this point.
 116  */
 117 void __init omap_detect_sram(void)
 118 {
 119         unsigned long reserved;
 120
 121         if (cpu_class_is_omap2()) {
 122                 if (is_sram_locked()) {
 123                         if (cpu_is_omap34xx()) {
 124                                 omap_sram_base = OMAP3_SRAM_PUB_VA;
 125                                 omap_sram_start = OMAP3_SRAM_PUB_PA;
 126                                 omap_sram_size = 0x8000; /* 32K */
 127                         } else {
 128                                 omap_sram_base = OMAP2_SRAM_PUB_VA;
 129                                 omap_sram_start = OMAP2_SRAM_PUB_PA;
 130                                 omap_sram_size = 0x800; /* 2K */
 131                         }
 132                 } else {
 133                         if (cpu_is_omap34xx()) {
 134                                 omap_sram_base = OMAP3_SRAM_VA;
 135                                 omap_sram_start = OMAP3_SRAM_PA;
 136                                 omap_sram_size = 0x10000; /* 64K */
 137                         } else {
 138                                 omap_sram_base = OMAP2_SRAM_VA;
 139                                 omap_sram_start = OMAP2_SRAM_PA;
 140                                 if (cpu_is_omap242x())
 141                                         omap_sram_size = 0xa0000; /* 640K */
 142                                 else if (cpu_is_omap243x())
 143                                         omap_sram_size = 0x10000; /* 64K */
 144                         }
 145                 }
 146         } else {
 147                 omap_sram_base = OMAP1_SRAM_VA;
 148                 omap_sram_start = OMAP1_SRAM_PA;
 149
 150                 if (cpu_is_omap730())
 151                         omap_sram_size = 0x32000;       /* 200K */
 152                 else if (cpu_is_omap15xx())
 153                         omap_sram_size = 0x30000;       /* 192K */
 154                 else if (cpu_is_omap1610() || cpu_is_omap1621() ||
 155                      cpu_is_omap1710())
 156                         omap_sram_size = 0x4000;        /* 16K */
 157                 else if (cpu_is_omap1611())
 158                         omap_sram_size = 0x3e800;       /* 250K */
 159                 else {
 160                         printk(KERN_ERR "Could not detect SRAM size\n");
 161                         omap_sram_size = 0x4000;
 162                 }
 163         }
 164         reserved = omapfb_reserve_sram(omap_sram_start, omap_sram_base,
 165                                        omap_sram_size,
 166                                        omap_sram_start + SRAM_BOOTLOADER_SZ,
 167                                        omap_sram_size - SRAM_BOOTLOADER_SZ);
 168         omap_sram_size -= reserved;
 169         omap_sram_ceil = omap_sram_base + omap_sram_size;
 170 }
 171
 172 static struct map_desc omap_sram_io_desc[] __initdata = {
 173         {       /* .length gets filled in at runtime */
 174                 .virtual        = OMAP1_SRAM_VA,
 175                 .pfn            = __phys_to_pfn(OMAP1_SRAM_PA),
 176                 .type           = MT_MEMORY
 177         }
 178 };
 179
 180 /*
 181  * Note that we cannot use ioremap for SRAM, as clock init needs SRAM early.
 182  */
 183 void __init omap_map_sram(void)
 184 {
 185         unsigned long base;
 186
 187         if (omap_sram_size == 0)
 188                 return;
 189
 190         if (cpu_is_omap24xx()) {
 191                 omap_sram_io_desc[0].virtual = OMAP2_SRAM_VA;
 192
 193                 base = OMAP2_SRAM_PA;
 194                 base = ROUND_DOWN(base, PAGE_SIZE);
 195                 omap_sram_io_desc[0].pfn = __phys_to_pfn(base);
 196         }
 197
 198         if (cpu_is_omap34xx()) {
 199                 omap_sram_io_desc[0].virtual = OMAP3_SRAM_VA;
 200                 base = OMAP3_SRAM_PA;
 201                 base = ROUND_DOWN(base, PAGE_SIZE);
 202                 omap_sram_io_desc[0].pfn = __phys_to_pfn(base);
 203         }
 204
 205         omap_sram_io_desc[0].length = 1024 * 1024;      /* Use section desc */
 206         iotable_init(omap_sram_io_desc, ARRAY_SIZE(omap_sram_io_desc));
 207
 208         printk(KERN_INFO "SRAM: Mapped pa 0x%08lx to va 0x%08lx size: 0x%lx\n",
 209         __pfn_to_phys(omap_sram_io_desc[0].pfn),
 210         omap_sram_io_desc[0].virtual,
 211                omap_sram_io_desc[0].length);
 212
 213         /*
 214          * Normally devicemaps_init() would flush caches and tlb after
 215          * mdesc->map_io(), but since we're called from map_io(), we
 216          * must do it here.
 217          */
 218         local_flush_tlb_all();
 219         flush_cache_all();
 220
 221         /*
 222          * Looks like we need to preserve some bootloader code at the
 223          * beginning of SRAM for jumping to flash for reboot to work...
 224          */
 225         memset((void *)omap_sram_base + SRAM_BOOTLOADER_SZ, 0,
 226                omap_sram_size - SRAM_BOOTLOADER_SZ);
 227 }
 228
 229 void * omap_sram_push(void * start, unsigned long size)
 230 {
 231         if (size > (omap_sram_ceil - (omap_sram_base + SRAM_BOOTLOADER_SZ))) {
 232                 printk(KERN_ERR "Not enough space in SRAM\n");
 233                 return NULL;
 234         }
 235
 236         omap_sram_ceil -= size;
 237         omap_sram_ceil = ROUND_DOWN(omap_sram_ceil, sizeof(void *));
 238         memcpy((void *)omap_sram_ceil, start, size);
 239         flush_icache_range((unsigned long)start, (unsigned long)(start + size));
 240
 241         return (void *)omap_sram_ceil;
 242 }
 243
 244 static void omap_sram_error(void)
 245 {
 246         panic("Uninitialized SRAM function\n");
 247 }
 248
 249 #ifdef CONFIG_ARCH_OMAP1
 250
 251 static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl);
 252
 253 void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl)
 254 {
 255         if (!_omap_sram_reprogram_clock)
 256                 omap_sram_error();
 257
 258         return _omap_sram_reprogram_clock(dpllctl, ckctl);
 259 }
 260
 261 int __init omap1_sram_init(void)
 262 {
 263         _omap_sram_reprogram_clock =
 264                         omap_sram_push(omap1_sram_reprogram_clock,
 265                                         omap1_sram_reprogram_clock_sz);
 266
 267         return 0;
 268 }
 269
 270 #else
 271 #define omap1_sram_init()       do {} while (0)
 272 #endif
 273
 274 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
 275
 276 static void (*_omap2_sram_ddr_init)(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
 277                               u32 base_cs, u32 force_unlock);
 278
 279 void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
 280                    u32 base_cs, u32 force_unlock)
 281 {
 282         if (!_omap2_sram_ddr_init)
 283                 omap_sram_error();
 284
 285         return _omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl,
 286                                     base_cs, force_unlock);
 287 }
 288
 289 static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val,
 290                                           u32 mem_type);
 291
 292 void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type)
 293 {
 294         if (!_omap2_sram_reprogram_sdrc)
 295                 omap_sram_error();
 296
 297         return _omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type);
 298 }
 299
 300 static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);
 301
 302 u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass)
 303 {
 304         if (!_omap2_set_prcm)
 305                 omap_sram_error();
 306
 307         return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass);
 308 }
 309 #endif
 310
 311 #ifdef CONFIG_ARCH_OMAP2420
 312 int __init omap242x_sram_init(void)
 313 {
 314         _omap2_sram_ddr_init = omap_sram_push(omap242x_sram_ddr_init,
 315                                         omap242x_sram_ddr_init_sz);
 316
 317         _omap2_sram_reprogram_sdrc = omap_sram_push(omap242x_sram_reprogram_sdrc,
 318                                             omap242x_sram_reprogram_sdrc_sz);
 319
 320         _omap2_set_prcm = omap_sram_push(omap242x_sram_set_prcm,
 321                                          omap242x_sram_set_prcm_sz);
 322
 323         return 0;
 324 }
 325 #else
 326 static inline int omap242x_sram_init(void)
 327 {
 328         return 0;
 329 }
 330 #endif
 331
 332 #ifdef CONFIG_ARCH_OMAP2430
 333 int __init omap243x_sram_init(void)
 334 {
 335         _omap2_sram_ddr_init = omap_sram_push(omap243x_sram_ddr_init,
 336                                         omap243x_sram_ddr_init_sz);
 337
 338         _omap2_sram_reprogram_sdrc = omap_sram_push(omap243x_sram_reprogram_sdrc,
 339                                             omap243x_sram_reprogram_sdrc_sz);
 340
 341         _omap2_set_prcm = omap_sram_push(omap243x_sram_set_prcm,
 342                                          omap243x_sram_set_prcm_sz);
 343
 344         return 0;
 345 }
 346 #else
 347 static inline int omap243x_sram_init(void)
 348 {
 349         return 0;
 350 }
 351 #endif
 352
 353 #ifdef CONFIG_ARCH_OMAP3
 354
 355 static u32 (*_omap2_sram_reprogram_gpmc)(u32 perf_level);
 356 u32 omap2_sram_reprogram_gpmc(u32 perf_level)
 357 {
 358         if (!_omap2_sram_reprogram_gpmc)
 359                 omap_sram_error();
 360
 361         return _omap2_sram_reprogram_gpmc(perf_level);
 362 }
 363
 364 static u32 (*_omap2_sram_configure_core_dpll)(u32 m, u32 n,
 365                                                 u32 freqsel, u32 m2);
 366 u32 omap2_sram_configure_core_dpll(u32 m, u32 n, u32 freqsel, u32 m2)
 367 {
 368         if (!_omap2_sram_configure_core_dpll)
 369                 omap_sram_error();
 370
 371         return _omap2_sram_configure_core_dpll(m, n, freqsel, m2);
 372 }
 373
 374 /* REVISIT: Should this be same as omap34xx_sram_init() after off-idle? */
 375 void restore_sram_functions(void)
 376 {
 377         omap_sram_ceil = omap_sram_base + omap_sram_size;
 378
 379         _omap2_sram_reprogram_gpmc = omap_sram_push(omap34xx_sram_reprogram_gpmc,
 380                 omap34xx_sram_reprogram_gpmc_sz);
 381
 382         _omap2_sram_configure_core_dpll =
 383                         omap_sram_push(omap34xx_sram_configure_core_dpll,
 384                                         omap34xx_sram_configure_core_dpll_sz);
 385 }
 386
 387 int __init omap34xx_sram_init(void)
 388 {
 389         _omap2_sram_ddr_init = omap_sram_push(omap34xx_sram_ddr_init,
 390                                         omap34xx_sram_ddr_init_sz);
 391
 392         _omap2_sram_reprogram_sdrc = omap_sram_push(omap34xx_sram_reprogram_sdrc,
 393                                         omap34xx_sram_reprogram_sdrc_sz);
 394
 395         _omap2_set_prcm = omap_sram_push(omap34xx_sram_set_prcm,
 396                                         omap34xx_sram_set_prcm_sz);
 397
 398         _omap2_sram_reprogram_gpmc = omap_sram_push(omap34xx_sram_reprogram_gpmc,
 399                                         omap34xx_sram_reprogram_gpmc_sz);
 400
 401         _omap2_sram_configure_core_dpll =
 402                                 omap_sram_push(omap34xx_sram_configure_core_dpll,
 403                                         omap34xx_sram_configure_core_dpll_sz);
 404
 405         return 0;
 406 }
 407 #else
 408 static inline int omap34xx_sram_init(void)
 409 {
 410         return 0;
 411 }
 412 #endif
 413
 414 int __init omap_sram_init(void)
 415 {
 416         omap_detect_sram();
 417         omap_map_sram();
 418
 419         if (!(cpu_class_is_omap2()))
 420                 omap1_sram_init();
 421         else if (cpu_is_omap242x())
 422                 omap242x_sram_init();
 423         else if (cpu_is_omap2430())
 424                 omap243x_sram_init();
 425         else if (cpu_is_omap34xx())
 426                 omap34xx_sram_init();
 427
 428         return 0;
 429 }