arch/arm/mach-omap2/sram.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   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) 2009-2012 Texas Instruments
  10  * Added OMAP4/5 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/io.h>
  17
  18 #include <asm/fncpy.h>
  19 #include <asm/tlb.h>
  20 #include <asm/cacheflush.h>
  21
  22 #include <asm/mach/map.h>
  23
  24 #include "soc.h"
  25 #include "iomap.h"
  26 #include "prm2xxx_3xxx.h"
  27 #include "sdrc.h"
  28 #include "sram.h"
  29
  30 #define OMAP2_SRAM_PUB_PA       (OMAP2_SRAM_PA + 0xf800)
  31 #define OMAP3_SRAM_PUB_PA       (OMAP3_SRAM_PA + 0x8000)
  32
  33 #define SRAM_BOOTLOADER_SZ      0x00
  34
  35 #define OMAP24XX_VA_REQINFOPERM0        OMAP2_L3_IO_ADDRESS(0x68005048)
  36 #define OMAP24XX_VA_READPERM0           OMAP2_L3_IO_ADDRESS(0x68005050)
  37 #define OMAP24XX_VA_WRITEPERM0          OMAP2_L3_IO_ADDRESS(0x68005058)
  38
  39 #define OMAP34XX_VA_REQINFOPERM0        OMAP2_L3_IO_ADDRESS(0x68012848)
  40 #define OMAP34XX_VA_READPERM0           OMAP2_L3_IO_ADDRESS(0x68012850)
  41 #define OMAP34XX_VA_WRITEPERM0          OMAP2_L3_IO_ADDRESS(0x68012858)
  42 #define OMAP34XX_VA_ADDR_MATCH2         OMAP2_L3_IO_ADDRESS(0x68012880)
  43 #define OMAP34XX_VA_SMS_RG_ATT0         OMAP2_L3_IO_ADDRESS(0x6C000048)
  44
  45 #define GP_DEVICE               0x300
  46
  47 #define ROUND_DOWN(value,boundary)      ((value) & (~((boundary)-1)))
  48
  49 static unsigned long omap_sram_start;
  50 static unsigned long omap_sram_skip;
  51 static unsigned long omap_sram_size;
  52
  53 /*
  54  * Depending on the target RAMFS firewall setup, the public usable amount of
  55  * SRAM varies.  The default accessible size for all device types is 2k. A GP
  56  * device allows ARM11 but not other initiators for full size. This
  57  * functionality seems ok until some nice security API happens.
  58  */
  59 static int is_sram_locked(void)
  60 {
  61         if (OMAP2_DEVICE_TYPE_GP == omap_type()) {
  62                 /* RAMFW: R/W access to all initiators for all qualifier sets */
  63                 if (cpu_is_omap242x()) {
  64                         writel_relaxed(0xFF, OMAP24XX_VA_REQINFOPERM0); /* all q-vects */
  65                         writel_relaxed(0xCFDE, OMAP24XX_VA_READPERM0);  /* all i-read */
  66                         writel_relaxed(0xCFDE, OMAP24XX_VA_WRITEPERM0); /* all i-write */
  67                 }
  68                 if (cpu_is_omap34xx()) {
  69                         writel_relaxed(0xFFFF, OMAP34XX_VA_REQINFOPERM0); /* all q-vects */
  70                         writel_relaxed(0xFFFF, OMAP34XX_VA_READPERM0);  /* all i-read */
  71                         writel_relaxed(0xFFFF, OMAP34XX_VA_WRITEPERM0); /* all i-write */
  72                         writel_relaxed(0x0, OMAP34XX_VA_ADDR_MATCH2);
  73                         writel_relaxed(0xFFFFFFFF, OMAP34XX_VA_SMS_RG_ATT0);
  74                 }
  75                 return 0;
  76         } else
  77                 return 1; /* assume locked with no PPA or security driver */
  78 }
  79
  80 /*
  81  * The amount of SRAM depends on the core type.
  82  * Note that we cannot try to test for SRAM here because writes
  83  * to secure SRAM will hang the system. Also the SRAM is not
  84  * yet mapped at this point.
  85  */
  86 static void __init omap_detect_sram(void)
  87 {
  88         omap_sram_skip = SRAM_BOOTLOADER_SZ;
  89         if (is_sram_locked()) {
  90                 if (cpu_is_omap34xx()) {
  91                         omap_sram_start = OMAP3_SRAM_PUB_PA;
  92                         if ((omap_type() == OMAP2_DEVICE_TYPE_EMU) ||
  93                             (omap_type() == OMAP2_DEVICE_TYPE_SEC)) {
  94                                 omap_sram_size = 0x7000; /* 28K */
  95                                 omap_sram_skip += SZ_16K;
  96                         } else {
  97                                 omap_sram_size = 0x8000; /* 32K */
  98                         }
  99                 } else {
 100                         omap_sram_start = OMAP2_SRAM_PUB_PA;
 101                         omap_sram_size = 0x800; /* 2K */
 102                 }
 103         } else {
 104                 if (cpu_is_omap34xx()) {
 105                         omap_sram_start = OMAP3_SRAM_PA;
 106                         omap_sram_size = 0x10000; /* 64K */
 107                 } else {
 108                         omap_sram_start = OMAP2_SRAM_PA;
 109                         if (cpu_is_omap242x())
 110                                 omap_sram_size = 0xa0000; /* 640K */
 111                         else if (cpu_is_omap243x())
 112                                 omap_sram_size = 0x10000; /* 64K */
 113                 }
 114         }
 115 }
 116
 117 /*
 118  * Note that we cannot use ioremap for SRAM, as clock init needs SRAM early.
 119  */
 120 static void __init omap2_map_sram(void)
 121 {
 122         int cached = 1;
 123
 124         if (cpu_is_omap34xx()) {
 125                 /*
 126                  * SRAM must be marked as non-cached on OMAP3 since the
 127                  * CORE DPLL M2 divider change code (in SRAM) runs with the
 128                  * SDRAM controller disabled, and if it is marked cached,
 129                  * the ARM may attempt to write cache lines back to SDRAM
 130                  * which will cause the system to hang.
 131                  */
 132                 cached = 0;
 133         }
 134
 135         omap_map_sram(omap_sram_start, omap_sram_size,
 136                         omap_sram_skip, cached);
 137 }
 138
 139 static void (*_omap2_sram_ddr_init)(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
 140                               u32 base_cs, u32 force_unlock);
 141
 142 void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
 143                    u32 base_cs, u32 force_unlock)
 144 {
 145         BUG_ON(!_omap2_sram_ddr_init);
 146         _omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl,
 147                              base_cs, force_unlock);
 148 }
 149
 150 static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val,
 151                                           u32 mem_type);
 152
 153 void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type)
 154 {
 155         BUG_ON(!_omap2_sram_reprogram_sdrc);
 156         _omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type);
 157 }
 158
 159 static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);
 160
 161 u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass)
 162 {
 163         BUG_ON(!_omap2_set_prcm);
 164         return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass);
 165 }
 166
 167 #ifdef CONFIG_SOC_OMAP2420
 168 static int __init omap242x_sram_init(void)
 169 {
 170         _omap2_sram_ddr_init = omap_sram_push(omap242x_sram_ddr_init,
 171                                         omap242x_sram_ddr_init_sz);
 172
 173         _omap2_sram_reprogram_sdrc = omap_sram_push(omap242x_sram_reprogram_sdrc,
 174                                             omap242x_sram_reprogram_sdrc_sz);
 175
 176         _omap2_set_prcm = omap_sram_push(omap242x_sram_set_prcm,
 177                                          omap242x_sram_set_prcm_sz);
 178
 179         return 0;
 180 }
 181 #else
 182 static inline int omap242x_sram_init(void)
 183 {
 184         return 0;
 185 }
 186 #endif
 187
 188 #ifdef CONFIG_SOC_OMAP2430
 189 static int __init omap243x_sram_init(void)
 190 {
 191         _omap2_sram_ddr_init = omap_sram_push(omap243x_sram_ddr_init,
 192                                         omap243x_sram_ddr_init_sz);
 193
 194         _omap2_sram_reprogram_sdrc = omap_sram_push(omap243x_sram_reprogram_sdrc,
 195                                             omap243x_sram_reprogram_sdrc_sz);
 196
 197         _omap2_set_prcm = omap_sram_push(omap243x_sram_set_prcm,
 198                                          omap243x_sram_set_prcm_sz);
 199
 200         return 0;
 201 }
 202 #else
 203 static inline int omap243x_sram_init(void)
 204 {
 205         return 0;
 206 }
 207 #endif
 208
 209 #ifdef CONFIG_ARCH_OMAP3
 210
 211 void omap3_sram_restore_context(void)
 212 {
 213         omap_sram_reset();
 214
 215         omap_push_sram_idle();
 216 }
 217
 218 static inline int omap34xx_sram_init(void)
 219 {
 220         omap3_sram_restore_context();
 221         return 0;
 222 }
 223 #else
 224 static inline int omap34xx_sram_init(void)
 225 {
 226         return 0;
 227 }
 228 #endif /* CONFIG_ARCH_OMAP3 */
 229
 230 int __init omap_sram_init(void)
 231 {
 232         omap_detect_sram();
 233         omap2_map_sram();
 234
 235         if (cpu_is_omap242x())
 236                 omap242x_sram_init();
 237         else if (cpu_is_omap2430())
 238                 omap243x_sram_init();
 239         else if (cpu_is_omap34xx())
 240                 omap34xx_sram_init();
 241
 242         return 0;
 243 }