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_base;
  50 static unsigned long omap_sram_size;
  51 static unsigned long omap_sram_ceil;
  52
  53 unsigned long omap_fb_sram_start;
  54 unsigned long omap_fb_sram_size;
  55
  56 /* Depending on the target RAMFS firewall setup, the public usable amount of
  57  * SRAM varies.  The default accessable size for all device types is 2k. A GP
  58  * device allows ARM11 but not other initators for full size. This
  59  * functionality seems ok until some nice security API happens.
  60  */
  61 static int is_sram_locked(void)
  62 {
  63         int type = 0;
  64
  65         if (cpu_is_omap242x())
  66                 type = __raw_readl(VA_CONTROL_STAT) & TYPE_MASK;
  67
  68         if (type == GP_DEVICE) {
  69                 /* RAMFW: R/W access to all initators for all qualifier sets */
  70                 if (cpu_is_omap242x()) {
  71                         __raw_writel(0xFF, VA_REQINFOPERM0); /* all q-vects */
  72                         __raw_writel(0xCFDE, VA_READPERM0);  /* all i-read */
  73                         __raw_writel(0xCFDE, VA_WRITEPERM0); /* all i-write */
  74                 }
  75                 return 0;
  76         } else
  77                 return 1; /* assume locked with no PPA or security driver */
  78 }
  79
  80 void get_fb_sram_conf(unsigned long start_avail, unsigned size_avail,
  81                       unsigned long *start, unsigned long *size)
  82 {
  83         const struct omap_fbmem_config *fbmem_conf;
  84
  85         fbmem_conf = omap_get_config(OMAP_TAG_FBMEM, struct omap_fbmem_config);
  86         if (fbmem_conf != NULL) {
  87                 *start = fbmem_conf->fb_sram_start;
  88                 *size = fbmem_conf->fb_sram_size;
  89         } else {
  90                 *size = 0;
  91                 *start = 0;
  92         }
  93
  94         if (*size && (
  95             *start < start_avail ||
  96             *start + *size > start_avail + size_avail)) {
  97                 printk(KERN_ERR "invalid FB SRAM configuration\n");
  98                 *start = start_avail;
  99                 *size = size_avail;
 100         }
 101
 102         if (*size)
 103                 pr_info("Reserving %lu bytes SRAM for frame buffer\n", *size);
 104 }
 105
 106 /*
 107  * The amount of SRAM depends on the core type.
 108  * Note that we cannot try to test for SRAM here because writes
 109  * to secure SRAM will hang the system. Also the SRAM is not
 110  * yet mapped at this point.
 111  */
 112 void __init omap_detect_sram(void)
 113 {
 114         unsigned long sram_start;
 115
 116         if (cpu_is_omap24xx()) {
 117                 if (is_sram_locked()) {
 118                         omap_sram_base = OMAP2_SRAM_PUB_VA;
 119                         sram_start = OMAP2_SRAM_PUB_PA;
 120                         omap_sram_size = 0x800; /* 2K */
 121                 } else {
 122                         omap_sram_base = OMAP2_SRAM_VA;
 123                         sram_start = OMAP2_SRAM_PA;
 124                         if (cpu_is_omap242x())
 125                                 omap_sram_size = 0xa0000; /* 640K */
 126                         else if (cpu_is_omap243x())
 127                                 omap_sram_size = 0x10000; /* 64K */
 128                 }
 129         } else {
 130                 omap_sram_base = OMAP1_SRAM_VA;
 131                 sram_start = OMAP1_SRAM_PA;
 132
 133                 if (cpu_is_omap730())
 134                         omap_sram_size = 0x32000;       /* 200K */
 135                 else if (cpu_is_omap15xx())
 136                         omap_sram_size = 0x30000;       /* 192K */
 137                 else if (cpu_is_omap1610() || cpu_is_omap1621() ||
 138                      cpu_is_omap1710())
 139                         omap_sram_size = 0x4000;        /* 16K */
 140                 else if (cpu_is_omap1611())
 141                         omap_sram_size = 0x3e800;       /* 250K */
 142                 else {
 143                         printk(KERN_ERR "Could not detect SRAM size\n");
 144                         omap_sram_size = 0x4000;
 145                 }
 146         }
 147         get_fb_sram_conf(sram_start + SRAM_BOOTLOADER_SZ,
 148                          omap_sram_size - SRAM_BOOTLOADER_SZ,
 149                          &omap_fb_sram_start, &omap_fb_sram_size);
 150         if (omap_fb_sram_size)
 151                 omap_sram_size -= sram_start + omap_sram_size -
 152                                   omap_fb_sram_start;
 153         omap_sram_ceil = omap_sram_base + omap_sram_size;
 154 }
 155
 156 static struct map_desc omap_sram_io_desc[] __initdata = {
 157         {       /* .length gets filled in at runtime */
 158                 .virtual        = OMAP1_SRAM_VA,
 159                 .pfn            = __phys_to_pfn(OMAP1_SRAM_PA),
 160                 .type           = MT_DEVICE
 161         }
 162 };
 163
 164 /*
 165  * In order to use last 2kB of SRAM on 1611b, we must round the size
 166  * up to multiple of PAGE_SIZE. We cannot use ioremap for SRAM, as
 167  * clock init needs SRAM early.
 168  */
 169 void __init omap_map_sram(void)
 170 {
 171         unsigned long base;
 172
 173         if (omap_sram_size == 0)
 174                 return;
 175
 176         if (cpu_is_omap24xx()) {
 177                 omap_sram_io_desc[0].virtual = OMAP2_SRAM_VA;
 178
 179                 if (is_sram_locked())
 180                         base = OMAP2_SRAM_PUB_PA;
 181                 else
 182                         base = OMAP2_SRAM_PA;
 183                 base = ROUND_DOWN(base, PAGE_SIZE);
 184                 omap_sram_io_desc[0].pfn = __phys_to_pfn(base);
 185         }
 186
 187         omap_sram_io_desc[0].length = (omap_sram_size + PAGE_SIZE-1)/PAGE_SIZE;
 188         omap_sram_io_desc[0].length *= PAGE_SIZE;
 189         iotable_init(omap_sram_io_desc, ARRAY_SIZE(omap_sram_io_desc));
 190
 191         printk(KERN_INFO "SRAM: Mapped pa 0x%08lx to va 0x%08lx size: 0x%lx\n",
 192         __pfn_to_phys(omap_sram_io_desc[0].pfn),
 193         omap_sram_io_desc[0].virtual,
 194                omap_sram_io_desc[0].length);
 195
 196         /*
 197          * Normally devicemaps_init() would flush caches and tlb after
 198          * mdesc->map_io(), but since we're called from map_io(), we
 199          * must do it here.
 200          */
 201         local_flush_tlb_all();
 202         flush_cache_all();
 203
 204         /*
 205          * Looks like we need to preserve some bootloader code at the
 206          * beginning of SRAM for jumping to flash for reboot to work...
 207          */
 208         memset((void *)omap_sram_base + SRAM_BOOTLOADER_SZ, 0,
 209                omap_sram_size - SRAM_BOOTLOADER_SZ);
 210 }
 211
 212 void * omap_sram_push(void * start, unsigned long size)
 213 {
 214         if (size > (omap_sram_ceil - (omap_sram_base + SRAM_BOOTLOADER_SZ))) {
 215                 printk(KERN_ERR "Not enough space in SRAM\n");
 216                 return NULL;
 217         }
 218
 219         omap_sram_ceil -= size;
 220         omap_sram_ceil = ROUND_DOWN(omap_sram_ceil, sizeof(void *));
 221         memcpy((void *)omap_sram_ceil, start, size);
 222
 223         return (void *)omap_sram_ceil;
 224 }
 225
 226 static void omap_sram_error(void)
 227 {
 228         panic("Uninitialized SRAM function\n");
 229 }
 230
 231 #ifdef CONFIG_ARCH_OMAP1
 232
 233 static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl);
 234
 235 void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl)
 236 {
 237         if (!_omap_sram_reprogram_clock)
 238                 omap_sram_error();
 239
 240         return _omap_sram_reprogram_clock(dpllctl, ckctl);
 241 }
 242
 243 int __init omap1_sram_init(void)
 244 {
 245         _omap_sram_reprogram_clock = omap_sram_push(sram_reprogram_clock,
 246                                                     sram_reprogram_clock_sz);
 247
 248         return 0;
 249 }
 250
 251 #else
 252 #define omap1_sram_init()       do {} while (0)
 253 #endif
 254
 255 #ifdef CONFIG_ARCH_OMAP2
 256
 257 static void (*_omap2_sram_ddr_init)(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
 258                               u32 base_cs, u32 force_unlock);
 259
 260 void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
 261                    u32 base_cs, u32 force_unlock)
 262 {
 263         if (!_omap2_sram_ddr_init)
 264                 omap_sram_error();
 265
 266         return _omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl,
 267                                     base_cs, force_unlock);
 268 }
 269
 270 static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val,
 271                                           u32 mem_type);
 272
 273 void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type)
 274 {
 275         if (!_omap2_sram_reprogram_sdrc)
 276                 omap_sram_error();
 277
 278         return _omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type);
 279 }
 280
 281 static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);
 282
 283 u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass)
 284 {
 285         if (!_omap2_set_prcm)
 286                 omap_sram_error();
 287
 288         return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass);
 289 }
 290
 291 int __init omap2_sram_init(void)
 292 {
 293         _omap2_sram_ddr_init = omap_sram_push(sram_ddr_init, sram_ddr_init_sz);
 294
 295         _omap2_sram_reprogram_sdrc = omap_sram_push(sram_reprogram_sdrc,
 296                                                     sram_reprogram_sdrc_sz);
 297         _omap2_set_prcm = omap_sram_push(sram_set_prcm, sram_set_prcm_sz);
 298
 299         return 0;
 300 }
 301 #else
 302 #define omap2_sram_init()       do {} while (0)
 303 #endif
 304
 305 int __init omap_sram_init(void)
 306 {
 307         omap_detect_sram();
 308         omap_map_sram();
 309
 310         if (!cpu_is_omap24xx())
 311                 omap1_sram_init();
 312         else
 313                 omap2_sram_init();
 314
 315         return 0;
 316 }