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
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17
  18 #include <asm/tlb.h>
  19 #include <asm/io.h>
  20 #include <asm/cacheflush.h>
  21
  22 #include <asm/mach/map.h>
  23
  24 #include <asm/arch/sram.h>
  25 #include <asm/arch/board.h>
  26
  27 #define OMAP1_SRAM_PA           0x20000000
  28 #define OMAP1_SRAM_VA           0xd0000000
  29 #define OMAP2_SRAM_PA           0x40200000
  30 #define OMAP2_SRAM_PUB_PA       0x4020f800
  31 #define OMAP2_SRAM_VA           0xd0000000
  32 #define OMAP2_SRAM_PUB_VA       0xd0000800
  33
  34 #if defined(CONFIG_ARCH_OMAP24XX)
  35 #define SRAM_BOOTLOADER_SZ      0x00
  36 #else
  37 #define SRAM_BOOTLOADER_SZ      0x80
  38 #endif
  39
  40 #define VA_REQINFOPERM0         IO_ADDRESS(0x68005048)
  41 #define VA_READPERM0            IO_ADDRESS(0x68005050)
  42 #define VA_WRITEPERM0           IO_ADDRESS(0x68005058)
  43 #define VA_CONTROL_STAT         IO_ADDRESS(0x480002F8)
  44 #define GP_DEVICE               0x300
  45 #define TYPE_MASK               0x700
  46
  47 #define ROUND_DOWN(value,boundary)      ((value) & (~((boundary)-1)))
  48
  49 static unsigned long omap_sram_start;
  50 static unsigned long omap_sram_base;
  51 static unsigned long omap_sram_size;
  52 static unsigned long omap_sram_ceil;
  53
  54 extern unsigned long omapfb_reserve_sram(unsigned long sram_pstart,
  55                                          unsigned long sram_vstart,
  56                                          unsigned long sram_size,
  57                                          unsigned long pstart_avail,
  58                                          unsigned long size_avail);
  59
  60 /*
  61  * Depending on the target RAMFS firewall setup, the public usable amount of
  62  * SRAM varies.  The default accessible size for all device types is 2k. A GP
  63  * device allows ARM11 but not other initiators for full size. This
  64  * functionality seems ok until some nice security API happens.
  65  */
  66 static int is_sram_locked(void)
  67 {
  68         int type = 0;
  69
  70         if (cpu_is_omap242x())
  71                 type = __raw_readl(VA_CONTROL_STAT) & TYPE_MASK;
  72
  73         if (type == GP_DEVICE) {
  74                 /* RAMFW: R/W access to all initiators for all qualifier sets */
  75                 if (cpu_is_omap242x()) {
  76                         __raw_writel(0xFF, VA_REQINFOPERM0); /* all q-vects */
  77                         __raw_writel(0xCFDE, VA_READPERM0);  /* all i-read */
  78                         __raw_writel(0xCFDE, VA_WRITEPERM0); /* all i-write */
  79                 }
  80                 return 0;
  81         } else
  82                 return 1; /* assume locked with no PPA or security driver */
  83 }
  84
  85 /*
  86  * The amount of SRAM depends on the core type.
  87  * Note that we cannot try to test for SRAM here because writes
  88  * to secure SRAM will hang the system. Also the SRAM is not
  89  * yet mapped at this point.
  90  */
  91 void __init omap_detect_sram(void)
  92 {
  93         unsigned long reserved;
  94
  95         if (cpu_is_omap24xx()) {
  96                 if (is_sram_locked()) {
  97                         omap_sram_base = OMAP2_SRAM_PUB_VA;
  98                         omap_sram_start = OMAP2_SRAM_PUB_PA;
  99                         omap_sram_size = 0x800; /* 2K */
 100                 } else {
 101                         omap_sram_base = OMAP2_SRAM_VA;
 102                         omap_sram_start = OMAP2_SRAM_PA;
 103                         if (cpu_is_omap242x())
 104                                 omap_sram_size = 0xa0000; /* 640K */
 105                         else if (cpu_is_omap243x())
 106                                 omap_sram_size = 0x10000; /* 64K */
 107                 }
 108         } else {
 109                 omap_sram_base = OMAP1_SRAM_VA;
 110                 omap_sram_start = OMAP1_SRAM_PA;
 111
 112                 if (cpu_is_omap730())
 113                         omap_sram_size = 0x32000;       /* 200K */
 114                 else if (cpu_is_omap15xx())
 115                         omap_sram_size = 0x30000;       /* 192K */
 116                 else if (cpu_is_omap1610() || cpu_is_omap1621() ||
 117                      cpu_is_omap1710())
 118                         omap_sram_size = 0x4000;        /* 16K */
 119                 else if (cpu_is_omap1611())
 120                         omap_sram_size = 0x3e800;       /* 250K */
 121                 else {
 122                         printk(KERN_ERR "Could not detect SRAM size\n");
 123                         omap_sram_size = 0x4000;
 124                 }
 125         }
 126         reserved = omapfb_reserve_sram(omap_sram_start, omap_sram_base,
 127                                        omap_sram_size,
 128                                        omap_sram_start + SRAM_BOOTLOADER_SZ,
 129                                        omap_sram_size - SRAM_BOOTLOADER_SZ);
 130         omap_sram_size -= reserved;
 131         omap_sram_ceil = omap_sram_base + omap_sram_size;
 132 }
 133
 134 static struct map_desc omap_sram_io_desc[] __initdata = {
 135         {       /* .length gets filled in at runtime */
 136                 .virtual        = OMAP1_SRAM_VA,
 137                 .pfn            = __phys_to_pfn(OMAP1_SRAM_PA),
 138                 .type           = MT_MEMORY
 139         }
 140 };
 141
 142 /*
 143  * Note that we cannot use ioremap for SRAM, as clock init needs SRAM early.
 144  */
 145 void __init omap_map_sram(void)
 146 {
 147         unsigned long base;
 148
 149         if (omap_sram_size == 0)
 150                 return;
 151
 152         if (cpu_is_omap24xx()) {
 153                 omap_sram_io_desc[0].virtual = OMAP2_SRAM_VA;
 154
 155                 base = OMAP2_SRAM_PA;
 156                 base = ROUND_DOWN(base, PAGE_SIZE);
 157                 omap_sram_io_desc[0].pfn = __phys_to_pfn(base);
 158         }
 159
 160         omap_sram_io_desc[0].length = 1024 * 1024;      /* Use section desc */
 161         iotable_init(omap_sram_io_desc, ARRAY_SIZE(omap_sram_io_desc));
 162
 163         printk(KERN_INFO "SRAM: Mapped pa 0x%08lx to va 0x%08lx size: 0x%lx\n",
 164         __pfn_to_phys(omap_sram_io_desc[0].pfn),
 165         omap_sram_io_desc[0].virtual,
 166                omap_sram_io_desc[0].length);
 167
 168         /*
 169          * Normally devicemaps_init() would flush caches and tlb after
 170          * mdesc->map_io(), but since we're called from map_io(), we
 171          * must do it here.
 172          */
 173         local_flush_tlb_all();
 174         flush_cache_all();
 175
 176         /*
 177          * Looks like we need to preserve some bootloader code at the
 178          * beginning of SRAM for jumping to flash for reboot to work...
 179          */
 180         memset((void *)omap_sram_base + SRAM_BOOTLOADER_SZ, 0,
 181                omap_sram_size - SRAM_BOOTLOADER_SZ);
 182 }
 183
 184 void * omap_sram_push(void * start, unsigned long size)
 185 {
 186         if (size > (omap_sram_ceil - (omap_sram_base + SRAM_BOOTLOADER_SZ))) {
 187                 printk(KERN_ERR "Not enough space in SRAM\n");
 188                 return NULL;
 189         }
 190
 191         omap_sram_ceil -= size;
 192         omap_sram_ceil = ROUND_DOWN(omap_sram_ceil, sizeof(void *));
 193         memcpy((void *)omap_sram_ceil, start, size);
 194
 195         return (void *)omap_sram_ceil;
 196 }
 197
 198 static void omap_sram_error(void)
 199 {
 200         panic("Uninitialized SRAM function\n");
 201 }
 202
 203 #ifdef CONFIG_ARCH_OMAP1
 204
 205 static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl);
 206
 207 void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl)
 208 {
 209         if (!_omap_sram_reprogram_clock)
 210                 omap_sram_error();
 211
 212         return _omap_sram_reprogram_clock(dpllctl, ckctl);
 213 }
 214
 215 int __init omap1_sram_init(void)
 216 {
 217         _omap_sram_reprogram_clock = omap_sram_push(sram_reprogram_clock,
 218                                                     sram_reprogram_clock_sz);
 219
 220         return 0;
 221 }
 222
 223 #else
 224 #define omap1_sram_init()       do {} while (0)
 225 #endif
 226
 227 #ifdef CONFIG_ARCH_OMAP2
 228
 229 static void (*_omap2_sram_ddr_init)(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
 230                               u32 base_cs, u32 force_unlock);
 231
 232 void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
 233                    u32 base_cs, u32 force_unlock)
 234 {
 235         if (!_omap2_sram_ddr_init)
 236                 omap_sram_error();
 237
 238         return _omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl,
 239                                     base_cs, force_unlock);
 240 }
 241
 242 static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val,
 243                                           u32 mem_type);
 244
 245 void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type)
 246 {
 247         if (!_omap2_sram_reprogram_sdrc)
 248                 omap_sram_error();
 249
 250         return _omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type);
 251 }
 252
 253 static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);
 254
 255 u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass)
 256 {
 257         if (!_omap2_set_prcm)
 258                 omap_sram_error();
 259
 260         return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass);
 261 }
 262
 263 int __init omap2_sram_init(void)
 264 {
 265         _omap2_sram_ddr_init = omap_sram_push(sram_ddr_init, sram_ddr_init_sz);
 266
 267         _omap2_sram_reprogram_sdrc = omap_sram_push(sram_reprogram_sdrc,
 268                                                     sram_reprogram_sdrc_sz);
 269         _omap2_set_prcm = omap_sram_push(sram_set_prcm, sram_set_prcm_sz);
 270
 271         return 0;
 272 }
 273 #else
 274 #define omap2_sram_init()       do {} while (0)
 275 #endif
 276
 277 int __init omap_sram_init(void)
 278 {
 279         omap_detect_sram();
 280         omap_map_sram();
 281
 282         if (!cpu_is_omap24xx())
 283                 omap1_sram_init();
 284         else
 285                 omap2_sram_init();
 286
 287         return 0;
 288 }