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  * 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 #include <linux/io.h>
  19
  20 #include <asm/tlb.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 #include <mach/cpu.h>
  28
  29 #include <mach/control.h>
  30
  31 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
  32 # include "../mach-omap2/prm.h"
  33 # include "../mach-omap2/cm.h"
  34 # include "../mach-omap2/sdrc.h"
  35 #endif
  36
  37 #define OMAP1_SRAM_PA           0x20000000
  38 #define OMAP1_SRAM_VA           VMALLOC_END
  39 #define OMAP2_SRAM_PA           0x40200000
  40 #define OMAP2_SRAM_PUB_PA       0x4020f800
  41 #define OMAP2_SRAM_VA           VMALLOC_END
  42 #define OMAP2_SRAM_PUB_VA       (VMALLOC_END + 0x800)
  43 #define OMAP3_SRAM_PA           0x40200000
  44 #define OMAP3_SRAM_VA           0xd7000000
  45 #define OMAP3_SRAM_PUB_PA       0x40208000
  46 #define OMAP3_SRAM_PUB_VA       0xd7008000
  47
  48 #if defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX)
  49 #define SRAM_BOOTLOADER_SZ      0x00
  50 #else
  51 #define SRAM_BOOTLOADER_SZ      0x80
  52 #endif
  53
  54 #define OMAP24XX_VA_REQINFOPERM0        IO_ADDRESS(0x68005048)
  55 #define OMAP24XX_VA_READPERM0           IO_ADDRESS(0x68005050)
  56 #define OMAP24XX_VA_WRITEPERM0          IO_ADDRESS(0x68005058)
  57
  58 #define OMAP34XX_VA_REQINFOPERM0        IO_ADDRESS(0x68012848)
  59 #define OMAP34XX_VA_READPERM0           IO_ADDRESS(0x68012850)
  60 #define OMAP34XX_VA_WRITEPERM0          IO_ADDRESS(0x68012858)
  61 #define OMAP34XX_VA_ADDR_MATCH2         IO_ADDRESS(0x68012880)
  62 #define OMAP34XX_VA_SMS_RG_ATT0         IO_ADDRESS(0x6C000048)
  63 #define OMAP34XX_VA_CONTROL_STAT        IO_ADDRESS(0x480022F0)
  64
  65 #define GP_DEVICE               0x300
  66
  67 #define ROUND_DOWN(value,boundary)      ((value) & (~((boundary)-1)))
  68
  69 static unsigned long omap_sram_start;
  70 static unsigned long omap_sram_base;
  71 static unsigned long omap_sram_size;
  72 static unsigned long omap_sram_ceil;
  73
  74 extern unsigned long omapfb_reserve_sram(unsigned long sram_pstart,
  75                                          unsigned long sram_vstart,
  76                                          unsigned long sram_size,
  77                                          unsigned long pstart_avail,
  78                                          unsigned long size_avail);
  79
  80 /*
  81  * Depending on the target RAMFS firewall setup, the public usable amount of
  82  * SRAM varies.  The default accessible size for all device types is 2k. A GP
  83  * device allows ARM11 but not other initiators for full size. This
  84  * functionality seems ok until some nice security API happens.
  85  */
  86 static int is_sram_locked(void)
  87 {
  88         int type = 0;
  89
  90         if (cpu_is_omap242x())
  91                 type = omap_rev() & OMAP2_DEVICETYPE_MASK;
  92
  93         if (type == GP_DEVICE) {
  94                 /* RAMFW: R/W access to all initiators for all qualifier sets */
  95                 if (cpu_is_omap242x()) {
  96                         __raw_writel(0xFF, OMAP24XX_VA_REQINFOPERM0); /* all q-vects */
  97                         __raw_writel(0xCFDE, OMAP24XX_VA_READPERM0);  /* all i-read */
  98                         __raw_writel(0xCFDE, OMAP24XX_VA_WRITEPERM0); /* all i-write */
  99                 }
 100                 if (cpu_is_omap34xx()) {
 101                         __raw_writel(0xFFFF, OMAP34XX_VA_REQINFOPERM0); /* all q-vects */
 102                         __raw_writel(0xFFFF, OMAP34XX_VA_READPERM0);  /* all i-read */
 103                         __raw_writel(0xFFFF, OMAP34XX_VA_WRITEPERM0); /* all i-write */
 104                         __raw_writel(0x0, OMAP34XX_VA_ADDR_MATCH2);
 105                         __raw_writel(0xFFFFFFFF, OMAP34XX_VA_SMS_RG_ATT0);
 106                 }
 107                 return 0;
 108         } else
 109                 return 1; /* assume locked with no PPA or security driver */
 110 }
 111
 112 /*
 113  * The amount of SRAM depends on the core type.
 114  * Note that we cannot try to test for SRAM here because writes
 115  * to secure SRAM will hang the system. Also the SRAM is not
 116  * yet mapped at this point.
 117  */
 118 void __init omap_detect_sram(void)
 119 {
 120         unsigned long reserved;
 121
 122         if (cpu_class_is_omap2()) {
 123                 if (is_sram_locked()) {
 124                         if (cpu_is_omap34xx()) {
 125                                 omap_sram_base = OMAP3_SRAM_PUB_VA;
 126                                 omap_sram_start = OMAP3_SRAM_PUB_PA;
 127                                 omap_sram_size = 0x8000; /* 32K */
 128                         } else {
 129                                 omap_sram_base = OMAP2_SRAM_PUB_VA;
 130                                 omap_sram_start = OMAP2_SRAM_PUB_PA;
 131                                 omap_sram_size = 0x800; /* 2K */
 132                         }
 133                 } else {
 134                         if (cpu_is_omap34xx()) {
 135                                 omap_sram_base = OMAP3_SRAM_VA;
 136                                 omap_sram_start = OMAP3_SRAM_PA;
 137                                 omap_sram_size = 0x10000; /* 64K */
 138                         } else {
 139                                 omap_sram_base = OMAP2_SRAM_VA;
 140                                 omap_sram_start = OMAP2_SRAM_PA;
 141                                 if (cpu_is_omap242x())
 142                                         omap_sram_size = 0xa0000; /* 640K */
 143                                 else if (cpu_is_omap243x())
 144                                         omap_sram_size = 0x10000; /* 64K */
 145                         }
 146                 }
 147         } else {
 148                 omap_sram_base = OMAP1_SRAM_VA;
 149                 omap_sram_start = OMAP1_SRAM_PA;
 150
 151                 if (cpu_is_omap7xx())
 152                         omap_sram_size = 0x32000;       /* 200K */
 153                 else if (cpu_is_omap15xx())
 154                         omap_sram_size = 0x30000;       /* 192K */
 155                 else if (cpu_is_omap1610() || cpu_is_omap1621() ||
 156                      cpu_is_omap1710())
 157                         omap_sram_size = 0x4000;        /* 16K */
 158                 else if (cpu_is_omap1611())
 159                         omap_sram_size = 0x3e800;       /* 250K */
 160                 else {
 161                         printk(KERN_ERR "Could not detect SRAM size\n");
 162                         omap_sram_size = 0x4000;
 163                 }
 164         }
 165         reserved = omapfb_reserve_sram(omap_sram_start, omap_sram_base,
 166                                        omap_sram_size,
 167                                        omap_sram_start + SRAM_BOOTLOADER_SZ,
 168                                        omap_sram_size - SRAM_BOOTLOADER_SZ);
 169         omap_sram_size -= reserved;
 170         omap_sram_ceil = omap_sram_base + omap_sram_size;
 171 }
 172
 173 static struct map_desc omap_sram_io_desc[] __initdata = {
 174         {       /* .length gets filled in at runtime */
 175                 .virtual        = OMAP1_SRAM_VA,
 176                 .pfn            = __phys_to_pfn(OMAP1_SRAM_PA),
 177                 .type           = MT_MEMORY
 178         }
 179 };
 180
 181 /*
 182  * Note that we cannot use ioremap for SRAM, as clock init needs SRAM early.
 183  */
 184 void __init omap_map_sram(void)
 185 {
 186         unsigned long base;
 187
 188         if (omap_sram_size == 0)
 189                 return;
 190
 191         if (cpu_is_omap24xx()) {
 192                 omap_sram_io_desc[0].virtual = OMAP2_SRAM_VA;
 193
 194                 base = OMAP2_SRAM_PA;
 195                 base = ROUND_DOWN(base, PAGE_SIZE);
 196                 omap_sram_io_desc[0].pfn = __phys_to_pfn(base);
 197         }
 198
 199         if (cpu_is_omap34xx()) {
 200                 omap_sram_io_desc[0].virtual = OMAP3_SRAM_VA;
 201                 base = OMAP3_SRAM_PA;
 202                 base = ROUND_DOWN(base, PAGE_SIZE);
 203                 omap_sram_io_desc[0].pfn = __phys_to_pfn(base);
 204         }
 205
 206         omap_sram_io_desc[0].length = 1024 * 1024;      /* Use section desc */
 207         iotable_init(omap_sram_io_desc, ARRAY_SIZE(omap_sram_io_desc));
 208
 209         printk(KERN_INFO "SRAM: Mapped pa 0x%08lx to va 0x%08lx size: 0x%lx\n",
 210         __pfn_to_phys(omap_sram_io_desc[0].pfn),
 211         omap_sram_io_desc[0].virtual,
 212                omap_sram_io_desc[0].length);
 213
 214         /*
 215          * Normally devicemaps_init() would flush caches and tlb after
 216          * mdesc->map_io(), but since we're called from map_io(), we
 217          * must do it here.
 218          */
 219         local_flush_tlb_all();
 220         flush_cache_all();
 221
 222         /*
 223          * Looks like we need to preserve some bootloader code at the
 224          * beginning of SRAM for jumping to flash for reboot to work...
 225          */
 226         memset((void *)omap_sram_base + SRAM_BOOTLOADER_SZ, 0,
 227                omap_sram_size - SRAM_BOOTLOADER_SZ);
 228 }
 229
 230 void * omap_sram_push(void * start, unsigned long size)
 231 {
 232         if (size > (omap_sram_ceil - (omap_sram_base + SRAM_BOOTLOADER_SZ))) {
 233                 printk(KERN_ERR "Not enough space in SRAM\n");
 234                 return NULL;
 235         }
 236
 237         omap_sram_ceil -= size;
 238         omap_sram_ceil = ROUND_DOWN(omap_sram_ceil, sizeof(void *));
 239         memcpy((void *)omap_sram_ceil, start, size);
 240         flush_icache_range((unsigned long)start, (unsigned long)(start + size));
 241
 242         return (void *)omap_sram_ceil;
 243 }
 244
 245 static void omap_sram_error(void)
 246 {
 247         panic("Uninitialized SRAM function\n");
 248 }
 249
 250 #ifdef CONFIG_ARCH_OMAP1
 251
 252 static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl);
 253
 254 void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl)
 255 {
 256         if (!_omap_sram_reprogram_clock)
 257                 omap_sram_error();
 258
 259         _omap_sram_reprogram_clock(dpllctl, ckctl);
 260 }
 261
 262 int __init omap1_sram_init(void)
 263 {
 264         _omap_sram_reprogram_clock =
 265                         omap_sram_push(omap1_sram_reprogram_clock,
 266                                         omap1_sram_reprogram_clock_sz);
 267
 268         return 0;
 269 }
 270
 271 #else
 272 #define omap1_sram_init()       do {} while (0)
 273 #endif
 274
 275 #if defined(CONFIG_ARCH_OMAP2)
 276
 277 static void (*_omap2_sram_ddr_init)(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
 278                               u32 base_cs, u32 force_unlock);
 279
 280 void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
 281                    u32 base_cs, u32 force_unlock)
 282 {
 283         if (!_omap2_sram_ddr_init)
 284                 omap_sram_error();
 285
 286         _omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl,
 287                              base_cs, force_unlock);
 288 }
 289
 290 static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val,
 291                                           u32 mem_type);
 292
 293 void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type)
 294 {
 295         if (!_omap2_sram_reprogram_sdrc)
 296                 omap_sram_error();
 297
 298         _omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type);
 299 }
 300
 301 static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);
 302
 303 u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass)
 304 {
 305         if (!_omap2_set_prcm)
 306                 omap_sram_error();
 307
 308         return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass);
 309 }
 310 #endif
 311
 312 #ifdef CONFIG_ARCH_OMAP2420
 313 int __init omap242x_sram_init(void)
 314 {
 315         _omap2_sram_ddr_init = omap_sram_push(omap242x_sram_ddr_init,
 316                                         omap242x_sram_ddr_init_sz);
 317
 318         _omap2_sram_reprogram_sdrc = omap_sram_push(omap242x_sram_reprogram_sdrc,
 319                                             omap242x_sram_reprogram_sdrc_sz);
 320
 321         _omap2_set_prcm = omap_sram_push(omap242x_sram_set_prcm,
 322                                          omap242x_sram_set_prcm_sz);
 323
 324         return 0;
 325 }
 326 #else
 327 static inline int omap242x_sram_init(void)
 328 {
 329         return 0;
 330 }
 331 #endif
 332
 333 #ifdef CONFIG_ARCH_OMAP2430
 334 int __init omap243x_sram_init(void)
 335 {
 336         _omap2_sram_ddr_init = omap_sram_push(omap243x_sram_ddr_init,
 337                                         omap243x_sram_ddr_init_sz);
 338
 339         _omap2_sram_reprogram_sdrc = omap_sram_push(omap243x_sram_reprogram_sdrc,
 340                                             omap243x_sram_reprogram_sdrc_sz);
 341
 342         _omap2_set_prcm = omap_sram_push(omap243x_sram_set_prcm,
 343                                          omap243x_sram_set_prcm_sz);
 344
 345         return 0;
 346 }
 347 #else
 348 static inline int omap243x_sram_init(void)
 349 {
 350         return 0;
 351 }
 352 #endif
 353
 354 #ifdef CONFIG_ARCH_OMAP3
 355
 356 static u32 (*_omap3_sram_configure_core_dpll)(u32 sdrc_rfr_ctrl,
 357                                               u32 sdrc_actim_ctrla,
 358                                               u32 sdrc_actim_ctrlb,
 359                                               u32 m2);
 360 u32 omap3_configure_core_dpll(u32 sdrc_rfr_ctrl, u32 sdrc_actim_ctrla,
 361                               u32 sdrc_actim_ctrlb, u32 m2)
 362 {
 363         if (!_omap3_sram_configure_core_dpll)
 364                 omap_sram_error();
 365
 366         return _omap3_sram_configure_core_dpll(sdrc_rfr_ctrl,
 367                                                sdrc_actim_ctrla,
 368                                                sdrc_actim_ctrlb, m2);
 369 }
 370
 371 /* REVISIT: Should this be same as omap34xx_sram_init() after off-idle? */
 372 void restore_sram_functions(void)
 373 {
 374         omap_sram_ceil = omap_sram_base + omap_sram_size;
 375
 376         _omap3_sram_configure_core_dpll =
 377                 omap_sram_push(omap3_sram_configure_core_dpll,
 378                                omap3_sram_configure_core_dpll_sz);
 379 }
 380
 381 int __init omap34xx_sram_init(void)
 382 {
 383         _omap3_sram_configure_core_dpll =
 384                 omap_sram_push(omap3_sram_configure_core_dpll,
 385                                omap3_sram_configure_core_dpll_sz);
 386
 387         return 0;
 388 }
 389 #else
 390 static inline int omap34xx_sram_init(void)
 391 {
 392         return 0;
 393 }
 394 #endif
 395
 396 int __init omap_sram_init(void)
 397 {
 398         omap_detect_sram();
 399         omap_map_sram();
 400
 401         if (!(cpu_class_is_omap2()))
 402                 omap1_sram_init();
 403         else if (cpu_is_omap242x())
 404                 omap242x_sram_init();
 405         else if (cpu_is_omap2430())
 406                 omap243x_sram_init();
 407         else if (cpu_is_omap34xx())
 408                 omap34xx_sram_init();
 409
 410         return 0;
 411 }