err.no Git - linux-2.6/blob - 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 int     omap_fb_sram_plane = -1;
  55 int     omap_fb_sram_valid;
  56
  57 /* Depending on the target RAMFS firewall setup, the public usable amount of
  58  * SRAM varies.  The default accessable size for all device types is 2k. A GP
  59  * device allows ARM11 but not other initators for full size. This
  60  * functionality seems ok until some nice security API happens.
  61  */
  62 static int is_sram_locked(void)
  63 {
  64         int type = 0;
  65
  66         if (cpu_is_omap242x())
  67                 type = __raw_readl(VA_CONTROL_STAT) & TYPE_MASK;
  68
  69         if (type == GP_DEVICE) {
  70                 /* RAMFW: R/W access to all initators for all qualifier sets */
  71                 if (cpu_is_omap242x()) {
  72                         __raw_writel(0xFF, VA_REQINFOPERM0); /* all q-vects */
  73                         __raw_writel(0xCFDE, VA_READPERM0);  /* all i-read */
  74                         __raw_writel(0xCFDE, VA_WRITEPERM0); /* all i-write */
  75                 }
  76                 return 0;
  77         } else
  78                 return 1; /* assume locked with no PPA or security driver */
  79 }
  80
  81 static int get_fb_sram_conf(unsigned long start_avail, unsigned size_avail,
  82                               unsigned long *start, int *plane_idx)
  83 {
  84         const struct omap_fbmem_config *fbmem_conf;
  85         unsigned long size = 0;
  86         int i;
  87
  88         i = 0;
  89         *start = 0;
  90         *plane_idx = -1;
  91         while ((fbmem_conf = omap_get_nr_config(OMAP_TAG_FBMEM,
  92                                 struct omap_fbmem_config, i)) != NULL) {
  93                 u32 paddr, end;
  94
  95                 paddr = fbmem_conf->start;
  96                 end = fbmem_conf->start + fbmem_conf->size;
  97                 if (paddr > omap_sram_start &&
  98                     paddr < omap_sram_start + omap_sram_size) {
  99                         if (*plane_idx != -1 || paddr < start_avail ||
 100                             paddr == end ||
 101                             end > start_avail + size_avail) {
 102                                 printk(KERN_ERR "invalid FB SRAM configuration");
 103                                 *start = 0;
 104                                 return -1;
 105                         }
 106                         *plane_idx = i;
 107                         *start = fbmem_conf->start;
 108                         size = fbmem_conf->size;
 109                 }
 110                 i++;
 111         }
 112
 113         if (*plane_idx >= 0)
 114                 pr_info("Reserving %lu bytes SRAM frame buffer "
 115                         "for plane %d\n", size, *plane_idx);
 116
 117         return 0;
 118 }
 119
 120 /*
 121  * The amount of SRAM depends on the core type.
 122  * Note that we cannot try to test for SRAM here because writes
 123  * to secure SRAM will hang the system. Also the SRAM is not
 124  * yet mapped at this point.
 125  */
 126 void __init omap_detect_sram(void)
 127 {
 128         unsigned long fb_sram_start;
 129
 130         if (cpu_is_omap24xx()) {
 131                 if (is_sram_locked()) {
 132                         omap_sram_base = OMAP2_SRAM_PUB_VA;
 133                         omap_sram_start = OMAP2_SRAM_PUB_PA;
 134                         omap_sram_size = 0x800; /* 2K */
 135                 } else {
 136                         omap_sram_base = OMAP2_SRAM_VA;
 137                         omap_sram_start = OMAP2_SRAM_PA;
 138                         if (cpu_is_omap242x())
 139                                 omap_sram_size = 0xa0000; /* 640K */
 140                         else if (cpu_is_omap243x())
 141                                 omap_sram_size = 0x10000; /* 64K */
 142                 }
 143         } else {
 144                 omap_sram_base = OMAP1_SRAM_VA;
 145                 omap_sram_start = OMAP1_SRAM_PA;
 146
 147                 if (cpu_is_omap730())
 148                         omap_sram_size = 0x32000;       /* 200K */
 149                 else if (cpu_is_omap15xx())
 150                         omap_sram_size = 0x30000;       /* 192K */
 151                 else if (cpu_is_omap1610() || cpu_is_omap1621() ||
 152                      cpu_is_omap1710())
 153                         omap_sram_size = 0x4000;        /* 16K */
 154                 else if (cpu_is_omap1611())
 155                         omap_sram_size = 0x3e800;       /* 250K */
 156                 else {
 157                         printk(KERN_ERR "Could not detect SRAM size\n");
 158                         omap_sram_size = 0x4000;
 159                 }
 160         }
 161         if (get_fb_sram_conf(omap_sram_start + SRAM_BOOTLOADER_SZ,
 162                             omap_sram_size - SRAM_BOOTLOADER_SZ,
 163                             &fb_sram_start, &omap_fb_sram_plane) == 0)
 164                 omap_fb_sram_valid = 1;
 165         if (omap_fb_sram_valid && omap_fb_sram_plane >= 0)
 166                 omap_sram_size -= omap_sram_start + omap_sram_size -
 167                                   fb_sram_start;
 168         omap_sram_ceil = omap_sram_base + omap_sram_size;
 169 }
 170
 171 static struct map_desc omap_sram_io_desc[] __initdata = {
 172         {       /* .length gets filled in at runtime */
 173                 .virtual        = OMAP1_SRAM_VA,
 174                 .pfn            = __phys_to_pfn(OMAP1_SRAM_PA),
 175                 .type           = MT_MEMORY
 176         }
 177 };
 178
 179 /*
 180  * Note that we cannot use ioremap for SRAM, as clock init needs SRAM early.
 181  */
 182 void __init omap_map_sram(void)
 183 {
 184         unsigned long base;
 185
 186         if (omap_sram_size == 0)
 187                 return;
 188
 189         if (cpu_is_omap24xx()) {
 190                 omap_sram_io_desc[0].virtual = OMAP2_SRAM_VA;
 191
 192                 base = OMAP2_SRAM_PA;
 193                 base = ROUND_DOWN(base, PAGE_SIZE);
 194                 omap_sram_io_desc[0].pfn = __phys_to_pfn(base);
 195         }
 196
 197         omap_sram_io_desc[0].length = 1024 * 1024;      /* Use section desc */
 198         iotable_init(omap_sram_io_desc, ARRAY_SIZE(omap_sram_io_desc));
 199
 200         printk(KERN_INFO "SRAM: Mapped pa 0x%08lx to va 0x%08lx size: 0x%lx\n",
 201         __pfn_to_phys(omap_sram_io_desc[0].pfn),
 202         omap_sram_io_desc[0].virtual,
 203                omap_sram_io_desc[0].length);
 204
 205         /*
 206          * Normally devicemaps_init() would flush caches and tlb after
 207          * mdesc->map_io(), but since we're called from map_io(), we
 208          * must do it here.
 209          */
 210         local_flush_tlb_all();
 211         flush_cache_all();
 212
 213         /*
 214          * Looks like we need to preserve some bootloader code at the
 215          * beginning of SRAM for jumping to flash for reboot to work...
 216          */
 217         memset((void *)omap_sram_base + SRAM_BOOTLOADER_SZ, 0,
 218                omap_sram_size - SRAM_BOOTLOADER_SZ);
 219 }
 220
 221 void * omap_sram_push(void * start, unsigned long size)
 222 {
 223         if (size > (omap_sram_ceil - (omap_sram_base + SRAM_BOOTLOADER_SZ))) {
 224                 printk(KERN_ERR "Not enough space in SRAM\n");
 225                 return NULL;
 226         }
 227
 228         omap_sram_ceil -= size;
 229         omap_sram_ceil = ROUND_DOWN(omap_sram_ceil, sizeof(void *));
 230         memcpy((void *)omap_sram_ceil, start, size);
 231
 232         return (void *)omap_sram_ceil;
 233 }
 234
 235 static void omap_sram_error(void)
 236 {
 237         panic("Uninitialized SRAM function\n");
 238 }
 239
 240 #ifdef CONFIG_ARCH_OMAP1
 241
 242 static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl);
 243
 244 void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl)
 245 {
 246         if (!_omap_sram_reprogram_clock)
 247                 omap_sram_error();
 248
 249         return _omap_sram_reprogram_clock(dpllctl, ckctl);
 250 }
 251
 252 int __init omap1_sram_init(void)
 253 {
 254         _omap_sram_reprogram_clock = omap_sram_push(sram_reprogram_clock,
 255                                                     sram_reprogram_clock_sz);
 256
 257         return 0;
 258 }
 259
 260 #else
 261 #define omap1_sram_init()       do {} while (0)
 262 #endif
 263
 264 #ifdef CONFIG_ARCH_OMAP2
 265
 266 static void (*_omap2_sram_ddr_init)(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
 267                               u32 base_cs, u32 force_unlock);
 268
 269 void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
 270                    u32 base_cs, u32 force_unlock)
 271 {
 272         if (!_omap2_sram_ddr_init)
 273                 omap_sram_error();
 274
 275         return _omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl,
 276                                     base_cs, force_unlock);
 277 }
 278
 279 static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val,
 280                                           u32 mem_type);
 281
 282 void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type)
 283 {
 284         if (!_omap2_sram_reprogram_sdrc)
 285                 omap_sram_error();
 286
 287         return _omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type);
 288 }
 289
 290 static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);
 291
 292 u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass)
 293 {
 294         if (!_omap2_set_prcm)
 295                 omap_sram_error();
 296
 297         return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass);
 298 }
 299
 300 int __init omap2_sram_init(void)
 301 {
 302         _omap2_sram_ddr_init = omap_sram_push(sram_ddr_init, sram_ddr_init_sz);
 303
 304         _omap2_sram_reprogram_sdrc = omap_sram_push(sram_reprogram_sdrc,
 305                                                     sram_reprogram_sdrc_sz);
 306         _omap2_set_prcm = omap_sram_push(sram_set_prcm, sram_set_prcm_sz);
 307
 308         return 0;
 309 }
 310 #else
 311 #define omap2_sram_init()       do {} while (0)
 312 #endif
 313
 314 int __init omap_sram_init(void)
 315 {
 316         omap_detect_sram();
 317         omap_map_sram();
 318
 319         if (!cpu_is_omap24xx())
 320                 omap1_sram_init();
 321         else
 322                 omap2_sram_init();
 323
 324         return 0;
 325 }