arch/arm/mach-omap2/sram.c

   1 /*
   2  *
   3  * OMAP SRAM detection and management
   4  *
   5  * Copyright (C) 2005 Nokia Corporation
   6  * Written by Tony Lindgren <tony@atomide.com>
   7  *
   8  * Copyright (C) 2009-2012 Texas Instruments
   9  * Added OMAP4/5 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/init.h>
  19 #include <linux/io.h>
  20
  21 #include <asm/fncpy.h>
  22 #include <asm/tlb.h>
  23 #include <asm/cacheflush.h>
  24
  25 #include <asm/mach/map.h>
  26
  27 #include "soc.h"
  28 #include "iomap.h"
  29 #include "prm2xxx_3xxx.h"
  30 #include "sdrc.h"
  31 #include "sram.h"
  32
  33 #define OMAP2_SRAM_PUB_PA       (OMAP2_SRAM_PA + 0xf800)
  34 #define OMAP3_SRAM_PUB_PA       (OMAP3_SRAM_PA + 0x8000)
  35 #ifdef CONFIG_OMAP4_ERRATA_I688
  36 #define OMAP4_SRAM_PUB_PA       OMAP4_SRAM_PA
  37 #else
  38 #define OMAP4_SRAM_PUB_PA       (OMAP4_SRAM_PA + 0x4000)
  39 #endif
  40 #define OMAP5_SRAM_PA           0x40300000
  41
  42 #define SRAM_BOOTLOADER_SZ      0x00
  43
  44 #define OMAP24XX_VA_REQINFOPERM0        OMAP2_L3_IO_ADDRESS(0x68005048)
  45 #define OMAP24XX_VA_READPERM0           OMAP2_L3_IO_ADDRESS(0x68005050)
  46 #define OMAP24XX_VA_WRITEPERM0          OMAP2_L3_IO_ADDRESS(0x68005058)
  47
  48 #define OMAP34XX_VA_REQINFOPERM0        OMAP2_L3_IO_ADDRESS(0x68012848)
  49 #define OMAP34XX_VA_READPERM0           OMAP2_L3_IO_ADDRESS(0x68012850)
  50 #define OMAP34XX_VA_WRITEPERM0          OMAP2_L3_IO_ADDRESS(0x68012858)
  51 #define OMAP34XX_VA_ADDR_MATCH2         OMAP2_L3_IO_ADDRESS(0x68012880)
  52 #define OMAP34XX_VA_SMS_RG_ATT0         OMAP2_L3_IO_ADDRESS(0x6C000048)
  53
  54 #define GP_DEVICE               0x300
  55
  56 #define ROUND_DOWN(value,boundary)      ((value) & (~((boundary)-1)))
  57
  58 static unsigned long omap_sram_start;
  59 static unsigned long omap_sram_skip;
  60 static unsigned long omap_sram_size;
  61
  62 /*
  63  * Depending on the target RAMFS firewall setup, the public usable amount of
  64  * SRAM varies.  The default accessible size for all device types is 2k. A GP
  65  * device allows ARM11 but not other initiators for full size. This
  66  * functionality seems ok until some nice security API happens.
  67  */
  68 static int is_sram_locked(void)
  69 {
  70         if (OMAP2_DEVICE_TYPE_GP == omap_type()) {
  71                 /* RAMFW: R/W access to all initiators for all qualifier sets */
  72                 if (cpu_is_omap242x()) {
  73                         __raw_writel(0xFF, OMAP24XX_VA_REQINFOPERM0); /* all q-vects */
  74                         __raw_writel(0xCFDE, OMAP24XX_VA_READPERM0);  /* all i-read */
  75                         __raw_writel(0xCFDE, OMAP24XX_VA_WRITEPERM0); /* all i-write */
  76                 }
  77                 if (cpu_is_omap34xx()) {
  78                         __raw_writel(0xFFFF, OMAP34XX_VA_REQINFOPERM0); /* all q-vects */
  79                         __raw_writel(0xFFFF, OMAP34XX_VA_READPERM0);  /* all i-read */
  80                         __raw_writel(0xFFFF, OMAP34XX_VA_WRITEPERM0); /* all i-write */
  81                         __raw_writel(0x0, OMAP34XX_VA_ADDR_MATCH2);
  82                         __raw_writel(0xFFFFFFFF, OMAP34XX_VA_SMS_RG_ATT0);
  83                 }
  84                 return 0;
  85         } else
  86                 return 1; /* assume locked with no PPA or security driver */
  87 }
  88
  89 /*
  90  * The amount of SRAM depends on the core type.
  91  * Note that we cannot try to test for SRAM here because writes
  92  * to secure SRAM will hang the system. Also the SRAM is not
  93  * yet mapped at this point.
  94  */
  95 static void __init omap_detect_sram(void)
  96 {
  97         omap_sram_skip = SRAM_BOOTLOADER_SZ;
  98         if (is_sram_locked()) {
  99                 if (cpu_is_omap34xx()) {
 100                         omap_sram_start = OMAP3_SRAM_PUB_PA;
 101                         if ((omap_type() == OMAP2_DEVICE_TYPE_EMU) ||
 102                             (omap_type() == OMAP2_DEVICE_TYPE_SEC)) {
 103                                 omap_sram_size = 0x7000; /* 28K */
 104                                 omap_sram_skip += SZ_16K;
 105                         } else {
 106                                 omap_sram_size = 0x8000; /* 32K */
 107                         }
 108                 } else if (cpu_is_omap44xx()) {
 109                         omap_sram_start = OMAP4_SRAM_PUB_PA;
 110                         omap_sram_size = 0xa000; /* 40K */
 111                 } else if (soc_is_omap54xx()) {
 112                         omap_sram_start = OMAP5_SRAM_PA;
 113                         omap_sram_size = SZ_128K; /* 128KB */
 114                 } else {
 115                         omap_sram_start = OMAP2_SRAM_PUB_PA;
 116                         omap_sram_size = 0x800; /* 2K */
 117                 }
 118         } else {
 119                 if (soc_is_am33xx()) {
 120                         omap_sram_start = AM33XX_SRAM_PA;
 121                         omap_sram_size = 0x10000; /* 64K */
 122                 } else if (cpu_is_omap34xx()) {
 123                         omap_sram_start = OMAP3_SRAM_PA;
 124                         omap_sram_size = 0x10000; /* 64K */
 125                 } else if (cpu_is_omap44xx()) {
 126                         omap_sram_start = OMAP4_SRAM_PA;
 127                         omap_sram_size = 0xe000; /* 56K */
 128                 } else if (soc_is_omap54xx()) {
 129                         omap_sram_start = OMAP5_SRAM_PA;
 130                         omap_sram_size = SZ_128K; /* 128KB */
 131                 } else {
 132                         omap_sram_start = OMAP2_SRAM_PA;
 133                         if (cpu_is_omap242x())
 134                                 omap_sram_size = 0xa0000; /* 640K */
 135                         else if (cpu_is_omap243x())
 136                                 omap_sram_size = 0x10000; /* 64K */
 137                 }
 138         }
 139 }
 140
 141 /*
 142  * Note that we cannot use ioremap for SRAM, as clock init needs SRAM early.
 143  */
 144 static void __init omap2_map_sram(void)
 145 {
 146         int cached = 1;
 147
 148 #ifdef CONFIG_OMAP4_ERRATA_I688
 149         if (cpu_is_omap44xx()) {
 150                 omap_sram_start += PAGE_SIZE;
 151                 omap_sram_size -= SZ_16K;
 152         }
 153 #endif
 154         if (cpu_is_omap34xx()) {
 155                 /*
 156                  * SRAM must be marked as non-cached on OMAP3 since the
 157                  * CORE DPLL M2 divider change code (in SRAM) runs with the
 158                  * SDRAM controller disabled, and if it is marked cached,
 159                  * the ARM may attempt to write cache lines back to SDRAM
 160                  * which will cause the system to hang.
 161                  */
 162                 cached = 0;
 163         }
 164
 165         omap_map_sram(omap_sram_start, omap_sram_size,
 166                         omap_sram_skip, cached);
 167 }
 168
 169 static void (*_omap2_sram_ddr_init)(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
 170                               u32 base_cs, u32 force_unlock);
 171
 172 void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
 173                    u32 base_cs, u32 force_unlock)
 174 {
 175         BUG_ON(!_omap2_sram_ddr_init);
 176         _omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl,
 177                              base_cs, force_unlock);
 178 }
 179
 180 static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val,
 181                                           u32 mem_type);
 182
 183 void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type)
 184 {
 185         BUG_ON(!_omap2_sram_reprogram_sdrc);
 186         _omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type);
 187 }
 188
 189 static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);
 190
 191 u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass)
 192 {
 193         BUG_ON(!_omap2_set_prcm);
 194         return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass);
 195 }
 196
 197 #ifdef CONFIG_SOC_OMAP2420
 198 static int __init omap242x_sram_init(void)
 199 {
 200         _omap2_sram_ddr_init = omap_sram_push(omap242x_sram_ddr_init,
 201                                         omap242x_sram_ddr_init_sz);
 202
 203         _omap2_sram_reprogram_sdrc = omap_sram_push(omap242x_sram_reprogram_sdrc,
 204                                             omap242x_sram_reprogram_sdrc_sz);
 205
 206         _omap2_set_prcm = omap_sram_push(omap242x_sram_set_prcm,
 207                                          omap242x_sram_set_prcm_sz);
 208
 209         return 0;
 210 }
 211 #else
 212 static inline int omap242x_sram_init(void)
 213 {
 214         return 0;
 215 }
 216 #endif
 217
 218 #ifdef CONFIG_SOC_OMAP2430
 219 static int __init omap243x_sram_init(void)
 220 {
 221         _omap2_sram_ddr_init = omap_sram_push(omap243x_sram_ddr_init,
 222                                         omap243x_sram_ddr_init_sz);
 223
 224         _omap2_sram_reprogram_sdrc = omap_sram_push(omap243x_sram_reprogram_sdrc,
 225                                             omap243x_sram_reprogram_sdrc_sz);
 226
 227         _omap2_set_prcm = omap_sram_push(omap243x_sram_set_prcm,
 228                                          omap243x_sram_set_prcm_sz);
 229
 230         return 0;
 231 }
 232 #else
 233 static inline int omap243x_sram_init(void)
 234 {
 235         return 0;
 236 }
 237 #endif
 238
 239 #ifdef CONFIG_ARCH_OMAP3
 240
 241 static u32 (*_omap3_sram_configure_core_dpll)(
 242                         u32 m2, u32 unlock_dll, u32 f, u32 inc,
 243                         u32 sdrc_rfr_ctrl_0, u32 sdrc_actim_ctrl_a_0,
 244                         u32 sdrc_actim_ctrl_b_0, u32 sdrc_mr_0,
 245                         u32 sdrc_rfr_ctrl_1, u32 sdrc_actim_ctrl_a_1,
 246                         u32 sdrc_actim_ctrl_b_1, u32 sdrc_mr_1);
 247
 248 u32 omap3_configure_core_dpll(u32 m2, u32 unlock_dll, u32 f, u32 inc,
 249                         u32 sdrc_rfr_ctrl_0, u32 sdrc_actim_ctrl_a_0,
 250                         u32 sdrc_actim_ctrl_b_0, u32 sdrc_mr_0,
 251                         u32 sdrc_rfr_ctrl_1, u32 sdrc_actim_ctrl_a_1,
 252                         u32 sdrc_actim_ctrl_b_1, u32 sdrc_mr_1)
 253 {
 254         BUG_ON(!_omap3_sram_configure_core_dpll);
 255         return _omap3_sram_configure_core_dpll(
 256                         m2, unlock_dll, f, inc,
 257                         sdrc_rfr_ctrl_0, sdrc_actim_ctrl_a_0,
 258                         sdrc_actim_ctrl_b_0, sdrc_mr_0,
 259                         sdrc_rfr_ctrl_1, sdrc_actim_ctrl_a_1,
 260                         sdrc_actim_ctrl_b_1, sdrc_mr_1);
 261 }
 262
 263 void omap3_sram_restore_context(void)
 264 {
 265         omap_sram_reset();
 266
 267         _omap3_sram_configure_core_dpll =
 268                 omap_sram_push(omap3_sram_configure_core_dpll,
 269                                omap3_sram_configure_core_dpll_sz);
 270         omap_push_sram_idle();
 271 }
 272
 273 static inline int omap34xx_sram_init(void)
 274 {
 275         omap3_sram_restore_context();
 276         return 0;
 277 }
 278 #else
 279 static inline int omap34xx_sram_init(void)
 280 {
 281         return 0;
 282 }
 283 #endif /* CONFIG_ARCH_OMAP3 */
 284
 285 static inline int am33xx_sram_init(void)
 286 {
 287         return 0;
 288 }
 289
 290 int __init omap_sram_init(void)
 291 {
 292         omap_detect_sram();
 293         omap2_map_sram();
 294
 295         if (cpu_is_omap242x())
 296                 omap242x_sram_init();
 297         else if (cpu_is_omap2430())
 298                 omap243x_sram_init();
 299         else if (soc_is_am33xx())
 300                 am33xx_sram_init();
 301         else if (cpu_is_omap34xx())
 302                 omap34xx_sram_init();
 303
 304         return 0;
 305 }