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Sourcecode: linux-2.6 version File versions

sram.c

/*
 * linux/arch/arm/plat-omap/sram.c
 *
 * OMAP SRAM detection and management
 *
 * Copyright (C) 2005 Nokia Corporation
 * Written by Tony Lindgren <tony@atomide.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>

#include <asm/tlb.h>
#include <asm/io.h>
#include <asm/cacheflush.h>

#include <asm/mach/map.h>

#include <asm/arch/sram.h>
#include <asm/arch/board.h>

#define OMAP1_SRAM_PA         0x20000000
#define OMAP1_SRAM_VA         0xd0000000
#define OMAP2_SRAM_PA         0x40200000
#define OMAP2_SRAM_PUB_PA     0x4020f800
#define OMAP2_SRAM_VA         0xd0000000
#define OMAP2_SRAM_PUB_VA     0xd0000800

#if defined(CONFIG_ARCH_OMAP24XX)
#define SRAM_BOOTLOADER_SZ    0x00
#else
#define SRAM_BOOTLOADER_SZ    0x80
#endif

#define VA_REQINFOPERM0       IO_ADDRESS(0x68005048)
#define VA_READPERM0          IO_ADDRESS(0x68005050)
#define VA_WRITEPERM0         IO_ADDRESS(0x68005058)
#define VA_CONTROL_STAT       IO_ADDRESS(0x480002F8)
#define GP_DEVICE       0x300
#define TYPE_MASK       0x700

#define ROUND_DOWN(value,boundary)  ((value) & (~((boundary)-1)))

static unsigned long omap_sram_base;
static unsigned long omap_sram_size;
static unsigned long omap_sram_ceil;

unsigned long omap_fb_sram_start;
unsigned long omap_fb_sram_size;

/* Depending on the target RAMFS firewall setup, the public usable amount of
 * SRAM varies.  The default accessable size for all device types is 2k. A GP
 * device allows ARM11 but not other initators for full size. This
 * functionality seems ok until some nice security API happens.
 */
static int is_sram_locked(void)
{
      int type = 0;

      if (cpu_is_omap242x())
            type = __raw_readl(VA_CONTROL_STAT) & TYPE_MASK;

      if (type == GP_DEVICE) {
            /* RAMFW: R/W access to all initators for all qualifier sets */
            if (cpu_is_omap242x()) {
                  __raw_writel(0xFF, VA_REQINFOPERM0); /* all q-vects */
                  __raw_writel(0xCFDE, VA_READPERM0);  /* all i-read */
                  __raw_writel(0xCFDE, VA_WRITEPERM0); /* all i-write */
            }
            return 0;
      } else
            return 1; /* assume locked with no PPA or security driver */
}

void get_fb_sram_conf(unsigned long start_avail, unsigned size_avail,
                  unsigned long *start, unsigned long *size)
{
      const struct omap_fbmem_config *fbmem_conf;

      fbmem_conf = omap_get_config(OMAP_TAG_FBMEM, struct omap_fbmem_config);
      if (fbmem_conf != NULL) {
            *start = fbmem_conf->fb_sram_start;
            *size = fbmem_conf->fb_sram_size;
      } else {
            *size = 0;
            *start = 0;
      }

      if (*size && (
          *start < start_avail ||
          *start + *size > start_avail + size_avail)) {
            printk(KERN_ERR "invalid FB SRAM configuration\n");
            *start = start_avail;
            *size = size_avail;
      }

      if (*size)
            pr_info("Reserving %lu bytes SRAM for frame buffer\n", *size);
}

/*
 * The amount of SRAM depends on the core type.
 * Note that we cannot try to test for SRAM here because writes
 * to secure SRAM will hang the system. Also the SRAM is not
 * yet mapped at this point.
 */
void __init omap_detect_sram(void)
{
      unsigned long sram_start;

      if (cpu_is_omap24xx()) {
            if (is_sram_locked()) {
                  omap_sram_base = OMAP2_SRAM_PUB_VA;
                  sram_start = OMAP2_SRAM_PUB_PA;
                  omap_sram_size = 0x800; /* 2K */
            } else {
                  omap_sram_base = OMAP2_SRAM_VA;
                  sram_start = OMAP2_SRAM_PA;
                  if (cpu_is_omap242x())
                        omap_sram_size = 0xa0000; /* 640K */
                  else if (cpu_is_omap243x())
                        omap_sram_size = 0x10000; /* 64K */
            }
      } else {
            omap_sram_base = OMAP1_SRAM_VA;
            sram_start = OMAP1_SRAM_PA;

            if (cpu_is_omap730())
                  omap_sram_size = 0x32000;     /* 200K */
            else if (cpu_is_omap15xx())
                  omap_sram_size = 0x30000;     /* 192K */
            else if (cpu_is_omap1610() || cpu_is_omap1621() ||
                 cpu_is_omap1710())
                  omap_sram_size = 0x4000;      /* 16K */
            else if (cpu_is_omap1611())
                  omap_sram_size = 0x3e800;     /* 250K */
            else {
                  printk(KERN_ERR "Could not detect SRAM size\n");
                  omap_sram_size = 0x4000;
            }
      }
      get_fb_sram_conf(sram_start + SRAM_BOOTLOADER_SZ,
                   omap_sram_size - SRAM_BOOTLOADER_SZ,
                   &omap_fb_sram_start, &omap_fb_sram_size);
      if (omap_fb_sram_size)
            omap_sram_size -= sram_start + omap_sram_size -
                          omap_fb_sram_start;
      omap_sram_ceil = omap_sram_base + omap_sram_size;
}

static struct map_desc omap_sram_io_desc[] __initdata = {
      {     /* .length gets filled in at runtime */
            .virtual    = OMAP1_SRAM_VA,
            .pfn        = __phys_to_pfn(OMAP1_SRAM_PA),
            .type       = MT_MEMORY
      }
};

/*
 * Note that we cannot use ioremap for SRAM, as clock init needs SRAM early.
 */
void __init omap_map_sram(void)
{
      unsigned long base;

      if (omap_sram_size == 0)
            return;

      if (cpu_is_omap24xx()) {
            omap_sram_io_desc[0].virtual = OMAP2_SRAM_VA;

            if (is_sram_locked())
                  base = OMAP2_SRAM_PUB_PA;
            else
                  base = OMAP2_SRAM_PA;
            base = ROUND_DOWN(base, PAGE_SIZE);
            omap_sram_io_desc[0].pfn = __phys_to_pfn(base);
      }

      omap_sram_io_desc[0].length = 1024 * 1024;      /* Use section desc */
      iotable_init(omap_sram_io_desc, ARRAY_SIZE(omap_sram_io_desc));

      printk(KERN_INFO "SRAM: Mapped pa 0x%08lx to va 0x%08lx size: 0x%lx\n",
      __pfn_to_phys(omap_sram_io_desc[0].pfn),
      omap_sram_io_desc[0].virtual,
             omap_sram_io_desc[0].length);

      /*
       * Normally devicemaps_init() would flush caches and tlb after
       * mdesc->map_io(), but since we're called from map_io(), we
       * must do it here.
       */
      local_flush_tlb_all();
      flush_cache_all();

      /*
       * Looks like we need to preserve some bootloader code at the
       * beginning of SRAM for jumping to flash for reboot to work...
       */
      memset((void *)omap_sram_base + SRAM_BOOTLOADER_SZ, 0,
             omap_sram_size - SRAM_BOOTLOADER_SZ);
}

void * omap_sram_push(void * start, unsigned long size)
{
      if (size > (omap_sram_ceil - (omap_sram_base + SRAM_BOOTLOADER_SZ))) {
            printk(KERN_ERR "Not enough space in SRAM\n");
            return NULL;
      }

      omap_sram_ceil -= size;
      omap_sram_ceil = ROUND_DOWN(omap_sram_ceil, sizeof(void *));
      memcpy((void *)omap_sram_ceil, start, size);

      return (void *)omap_sram_ceil;
}

static void omap_sram_error(void)
{
      panic("Uninitialized SRAM function\n");
}

#ifdef CONFIG_ARCH_OMAP1

static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl);

void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl)
{
      if (!_omap_sram_reprogram_clock)
            omap_sram_error();

      return _omap_sram_reprogram_clock(dpllctl, ckctl);
}

int __init omap1_sram_init(void)
{
      _omap_sram_reprogram_clock = omap_sram_push(sram_reprogram_clock,
                                        sram_reprogram_clock_sz);

      return 0;
}

#else
#define omap1_sram_init()     do {} while (0)
#endif

#ifdef CONFIG_ARCH_OMAP2

static void (*_omap2_sram_ddr_init)(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
                        u32 base_cs, u32 force_unlock);

void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
               u32 base_cs, u32 force_unlock)
{
      if (!_omap2_sram_ddr_init)
            omap_sram_error();

      return _omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl,
                            base_cs, force_unlock);
}

static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val,
                                u32 mem_type);

void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type)
{
      if (!_omap2_sram_reprogram_sdrc)
            omap_sram_error();

      return _omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type);
}

static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);

u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass)
{
      if (!_omap2_set_prcm)
            omap_sram_error();

      return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass);
}

int __init omap2_sram_init(void)
{
      _omap2_sram_ddr_init = omap_sram_push(sram_ddr_init, sram_ddr_init_sz);

      _omap2_sram_reprogram_sdrc = omap_sram_push(sram_reprogram_sdrc,
                                        sram_reprogram_sdrc_sz);
      _omap2_set_prcm = omap_sram_push(sram_set_prcm, sram_set_prcm_sz);

      return 0;
}
#else
#define omap2_sram_init()     do {} while (0)
#endif

int __init omap_sram_init(void)
{
      omap_detect_sram();
      omap_map_sram();

      if (!cpu_is_omap24xx())
            omap1_sram_init();
      else
            omap2_sram_init();

      return 0;
}

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