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/config.h>
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18
  19 #include <asm/tlb.h>
  20 #include <asm/io.h>
  21 #include <asm/cacheflush.h>
  22
  23 #include <asm/mach/map.h>
  24
  25 #include <asm/arch/sram.h>
  26 #include <asm/arch/board.h>
  27
  28 #define OMAP1_SRAM_PA           0x20000000
  29 #define OMAP1_SRAM_VA           0xd0000000
  30 #define OMAP2_SRAM_PA           0x40200000
  31 #define OMAP2_SRAM_PUB_PA       0x4020f800
  32 #define OMAP2_SRAM_VA           0xd0000000
  33 #define OMAP2_SRAM_PUB_VA       0xd0000800
  34
  35 #if defined(CONFIG_ARCH_OMAP24XX)
  36 #define SRAM_BOOTLOADER_SZ      0x00
  37 #else
  38 #define SRAM_BOOTLOADER_SZ      0x80
  39 #endif
  40
  41 #define VA_REQINFOPERM0         IO_ADDRESS(0x68005048)
  42 #define VA_READPERM0            IO_ADDRESS(0x68005050)
  43 #define VA_WRITEPERM0           IO_ADDRESS(0x68005058)
  44 #define VA_CONTROL_STAT         IO_ADDRESS(0x480002F8)
  45 #define GP_DEVICE               0x300
  46 #define TYPE_MASK               0x700
  47
  48 #define ROUND_DOWN(value,boundary)      ((value) & (~((boundary)-1)))
  49
  50 static unsigned long omap_sram_base;
  51 static unsigned long omap_sram_size;
  52 static unsigned long omap_sram_ceil;
  53
  54 unsigned long omap_fb_sram_start;
  55 unsigned long omap_fb_sram_size;
  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 void get_fb_sram_conf(unsigned long start_avail, unsigned size_avail,
  82                       unsigned long *start, unsigned long *size)
  83 {
  84         const struct omap_fbmem_config *fbmem_conf;
  85
  86         fbmem_conf = omap_get_config(OMAP_TAG_FBMEM, struct omap_fbmem_config);
  87         if (fbmem_conf != NULL) {
  88                 *start = fbmem_conf->fb_sram_start;
  89                 *size = fbmem_conf->fb_sram_size;
  90         } else {
  91                 *size = 0;
  92                 *start = 0;
  93         }
  94
  95         if (*size && (
  96             *start < start_avail ||
  97             *start + *size > start_avail + size_avail)) {
  98                 printk(KERN_ERR "invalid FB SRAM configuration\n");
  99                 *start = start_avail;
 100                 *size = size_avail;
 101         }
 102
 103         if (*size)
 104                 pr_info("Reserving %lu bytes SRAM for frame buffer\n", *size);
 105 }
 106
 107 /*
 108  * The amount of SRAM depends on the core type.
 109  * Note that we cannot try to test for SRAM here because writes
 110  * to secure SRAM will hang the system. Also the SRAM is not
 111  * yet mapped at this point.
 112  */
 113 void __init omap_detect_sram(void)
 114 {
 115         unsigned long sram_start;
 116
 117         if (cpu_is_omap24xx()) {
 118                 if (is_sram_locked()) {
 119                         omap_sram_base = OMAP2_SRAM_PUB_VA;
 120                         sram_start = OMAP2_SRAM_PUB_PA;
 121                         omap_sram_size = 0x800; /* 2K */
 122                 } else {
 123                         omap_sram_base = OMAP2_SRAM_VA;
 124                         sram_start = OMAP2_SRAM_PA;
 125                         if (cpu_is_omap242x())
 126                                 omap_sram_size = 0xa0000; /* 640K */
 127                         else if (cpu_is_omap243x())
 128                                 omap_sram_size = 0x10000; /* 64K */
 129                 }
 130         } else {
 131                 omap_sram_base = OMAP1_SRAM_VA;
 132                 sram_start = OMAP1_SRAM_PA;
 133
 134                 if (cpu_is_omap730())
 135                         omap_sram_size = 0x32000;       /* 200K */
 136                 else if (cpu_is_omap15xx())
 137                         omap_sram_size = 0x30000;       /* 192K */
 138                 else if (cpu_is_omap1610() || cpu_is_omap1621() ||
 139                      cpu_is_omap1710())
 140                         omap_sram_size = 0x4000;        /* 16K */
 141                 else if (cpu_is_omap1611())
 142                         omap_sram_size = 0x3e800;       /* 250K */
 143                 else {
 144                         printk(KERN_ERR "Could not detect SRAM size\n");
 145                         omap_sram_size = 0x4000;
 146                 }
 147         }
 148         get_fb_sram_conf(sram_start + SRAM_BOOTLOADER_SZ,
 149                          omap_sram_size - SRAM_BOOTLOADER_SZ,
 150                          &omap_fb_sram_start, &omap_fb_sram_size);
 151         if (omap_fb_sram_size)
 152                 omap_sram_size -= sram_start + omap_sram_size -
 153                                   omap_fb_sram_start;
 154         omap_sram_ceil = omap_sram_base + omap_sram_size;
 155 }
 156
 157 static struct map_desc omap_sram_io_desc[] __initdata = {
 158         {       /* .length gets filled in at runtime */
 159                 .virtual        = OMAP1_SRAM_VA,
 160                 .pfn            = __phys_to_pfn(OMAP1_SRAM_PA),
 161                 .type           = MT_DEVICE
 162         }
 163 };
 164
 165 /*
 166  * In order to use last 2kB of SRAM on 1611b, we must round the size
 167  * up to multiple of PAGE_SIZE. We cannot use ioremap for SRAM, as
 168  * clock init needs SRAM early.
 169  */
 170 void __init omap_map_sram(void)
 171 {
 172         unsigned long base;
 173
 174         if (omap_sram_size == 0)
 175                 return;
 176
 177         if (cpu_is_omap24xx()) {
 178                 omap_sram_io_desc[0].virtual = OMAP2_SRAM_VA;
 179
 180                 if (is_sram_locked())
 181                         base = OMAP2_SRAM_PUB_PA;
 182                 else
 183                         base = OMAP2_SRAM_PA;
 184                 base = ROUND_DOWN(base, PAGE_SIZE);
 185                 omap_sram_io_desc[0].pfn = __phys_to_pfn(base);
 186         }
 187
 188         omap_sram_io_desc[0].length = (omap_sram_size + PAGE_SIZE-1)/PAGE_SIZE;
 189         omap_sram_io_desc[0].length *= PAGE_SIZE;
 190         iotable_init(omap_sram_io_desc, ARRAY_SIZE(omap_sram_io_desc));
 191
 192         printk(KERN_INFO "SRAM: Mapped pa 0x%08lx to va 0x%08lx size: 0x%lx\n",
 193         __pfn_to_phys(omap_sram_io_desc[0].pfn),
 194         omap_sram_io_desc[0].virtual,
 195                omap_sram_io_desc[0].length);
 196
 197         /*
 198          * Normally devicemaps_init() would flush caches and tlb after
 199          * mdesc->map_io(), but since we're called from map_io(), we
 200          * must do it here.
 201          */
 202         local_flush_tlb_all();
 203         flush_cache_all();
 204
 205         /*
 206          * Looks like we need to preserve some bootloader code at the
 207          * beginning of SRAM for jumping to flash for reboot to work...
 208          */
 209         memset((void *)omap_sram_base + SRAM_BOOTLOADER_SZ, 0,
 210                omap_sram_size - SRAM_BOOTLOADER_SZ);
 211 }
 212
 213 void * omap_sram_push(void * start, unsigned long size)
 214 {
 215         if (size > (omap_sram_ceil - (omap_sram_base + SRAM_BOOTLOADER_SZ))) {
 216                 printk(KERN_ERR "Not enough space in SRAM\n");
 217                 return NULL;
 218         }
 219
 220         omap_sram_ceil -= size;
 221         omap_sram_ceil = ROUND_DOWN(omap_sram_ceil, sizeof(void *));
 222         memcpy((void *)omap_sram_ceil, start, size);
 223
 224         return (void *)omap_sram_ceil;
 225 }
 226
 227 static void omap_sram_error(void)
 228 {
 229         panic("Uninitialized SRAM function\n");
 230 }
 231
 232 #ifdef CONFIG_ARCH_OMAP1
 233
 234 static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl);
 235
 236 void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl)
 237 {
 238         if (!_omap_sram_reprogram_clock)
 239                 omap_sram_error();
 240
 241         return _omap_sram_reprogram_clock(dpllctl, ckctl);
 242 }
 243
 244 int __init omap1_sram_init(void)
 245 {
 246         _omap_sram_reprogram_clock = omap_sram_push(sram_reprogram_clock,
 247                                                     sram_reprogram_clock_sz);
 248
 249         return 0;
 250 }
 251
 252 #else
 253 #define omap1_sram_init()       do {} while (0)
 254 #endif
 255
 256 #ifdef CONFIG_ARCH_OMAP2
 257
 258 static void (*_omap2_sram_ddr_init)(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
 259                               u32 base_cs, u32 force_unlock);
 260
 261 void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
 262                    u32 base_cs, u32 force_unlock)
 263 {
 264         if (!_omap2_sram_ddr_init)
 265                 omap_sram_error();
 266
 267         return _omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl,
 268                                     base_cs, force_unlock);
 269 }
 270
 271 static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val,
 272                                           u32 mem_type);
 273
 274 void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type)
 275 {
 276         if (!_omap2_sram_reprogram_sdrc)
 277                 omap_sram_error();
 278
 279         return _omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type);
 280 }
 281
 282 static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);
 283
 284 u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass)
 285 {
 286         if (!_omap2_set_prcm)
 287                 omap_sram_error();
 288
 289         return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass);
 290 }
 291
 292 int __init omap2_sram_init(void)
 293 {
 294         _omap2_sram_ddr_init = omap_sram_push(sram_ddr_init, sram_ddr_init_sz);
 295
 296         _omap2_sram_reprogram_sdrc = omap_sram_push(sram_reprogram_sdrc,
 297                                                     sram_reprogram_sdrc_sz);
 298         _omap2_set_prcm = omap_sram_push(sram_set_prcm, sram_set_prcm_sz);
 299
 300         return 0;
 301 }
 302 #else
 303 #define omap2_sram_init()       do {} while (0)
 304 #endif
 305
 306 int __init omap_sram_init(void)
 307 {
 308         omap_detect_sram();
 309         omap_map_sram();
 310
 311         if (!cpu_is_omap24xx())
 312                 omap1_sram_init();
 313         else
 314                 omap2_sram_init();
 315
 316         return 0;
 317 }