LXR uboot/common/cmd

   1/*
   2 * U-boot - bootldr.c
   3 *
   4 * Copyright (c) 2005-2008 Analog Devices Inc.
   5 *
   6 * See file CREDITS for list of people who contributed to this
   7 * project.
   8 *
   9 * Licensed under the GPL-2 or later.
  10 */
  11
  12#include <config.h>
  13#include <common.h>
  14#include <command.h>
  15
  16#include <asm/blackfin.h>
  17#include <asm/mach-common/bits/bootrom.h>
  18
  19/* Simple sanity check on the specified address to make sure it contains
  20 * an LDR image of some sort.
  21 */
  22static bool ldr_valid_signature(uint8_t *data)
  23{
  24#if defined(__ADSPBF561__)
  25
  26        /* BF56x has a 4 byte global header */
  27        if (data[3] == (GFLAG_56X_SIGN_MAGIC << (GFLAG_56X_SIGN_SHIFT - 24)))
  28                return true;
  29
  30#elif defined(__ADSPBF531__) || defined(__ADSPBF532__) || defined(__ADSPBF533__) || \
  31      defined(__ADSPBF534__) || defined(__ADSPBF536__) || defined(__ADSPBF537__) || \
  32      defined(__ADSPBF538__) || defined(__ADSPBF539__)
  33
  34        /* all the BF53x should start at this address mask */
  35        uint32_t addr;
  36        memmove(&addr, data, sizeof(addr));
  37        if ((addr & 0xFF0FFF0F) == 0xFF000000)
  38                return true;
  39#else
  40
  41        /* everything newer has a magic byte */
  42        uint32_t count;
  43        memmove(&count, data + 8, sizeof(count));
  44        if (data[3] == 0xAD && count == 0)
  45                return true;
  46
  47#endif
  48
  49        return false;
  50}
  51
  52/* If the Blackfin is new enough, the Blackfin on-chip ROM supports loading
  53 * LDRs from random memory addresses.  So whenever possible, use that.  In
  54 * the older cases (BF53x/BF561), parse the LDR format ourselves.
  55 */
  56static void ldr_load(uint8_t *base_addr)
  57{
  58#if defined(__ADSPBF531__) || defined(__ADSPBF532__) || defined(__ADSPBF533__) || \
  59  /*defined(__ADSPBF534__) || defined(__ADSPBF536__) || defined(__ADSPBF537__) ||*/\
  60    defined(__ADSPBF538__) || defined(__ADSPBF539__) || defined(__ADSPBF561__)
  61
  62        uint32_t addr;
  63        uint32_t count;
  64        uint16_t flags;
  65
  66        /* the bf56x has a 4 byte global header ... but it is useless to
  67         * us when booting an LDR from a memory address, so skip it
  68         */
  69# ifdef __ADSPBF561__
  70        base_addr += 4;
  71# endif
  72
  73        memmove(&flags, base_addr + 8, sizeof(flags));
  74        bfin_write_EVT1(flags & BFLAG_53X_RESVECT ? 0xFFA00000 : 0xFFA08000);
  75
  76        do {
  77                /* block header may not be aligned */
  78                memmove(&addr, base_addr, sizeof(addr));
  79                memmove(&count, base_addr+4, sizeof(count));
  80                memmove(&flags, base_addr+8, sizeof(flags));
  81                base_addr += sizeof(addr) + sizeof(count) + sizeof(flags);
  82
  83                printf("loading to 0x%08x (%#x bytes) flags: 0x%04x\n",
  84                        addr, count, flags);
  85
  86                if (!(flags & BFLAG_53X_IGNORE)) {
  87                        if (flags & BFLAG_53X_ZEROFILL)
  88                                memset((void *)addr, 0x00, count);
  89                        else
  90                                memcpy((void *)addr, base_addr, count);
  91
  92                        if (flags & BFLAG_53X_INIT) {
  93                                void (*init)(void) = (void *)addr;
  94                                init();
  95                        }
  96                }
  97
  98                if (!(flags & BFLAG_53X_ZEROFILL))
  99                        base_addr += count;
 100        } while (!(flags & BFLAG_53X_FINAL));
 101
 102#endif
 103}
 104
 105/* For BF537, we use the _BOOTROM_BOOT_DXE_FLASH funky ROM function.
 106 * For all other BF53x/BF56x, we just call the entry point.
 107 * For everything else (newer), we use _BOOTROM_MEMBOOT ROM function.
 108 */
 109static void ldr_exec(void *addr)
 110{
 111#if defined(__ADSPBF534__) || defined(__ADSPBF536__) || defined(__ADSPBF537__)
 112
 113        /* restore EVT1 to reset value as this is what the bootrom uses as
 114         * the default entry point when booting the final block of LDRs
 115         */
 116        bfin_write_EVT1(L1_INST_SRAM);
 117        __asm__("call (%0);" : : "a"(_BOOTROM_MEMBOOT), "q7"(addr) : "RETS", "memory");
 118
 119#elif defined(__ADSPBF531__) || defined(__ADSPBF532__) || defined(__ADSPBF533__) || \
 120      defined(__ADSPBF538__) || defined(__ADSPBF539__) || defined(__ADSPBF561__)
 121
 122        void (*ldr_entry)(void) = (void *)bfin_read_EVT1();
 123        ldr_entry();
 124
 125#else
 126
 127        int32_t (*BOOTROM_MEM)(void *, int32_t, int32_t, void *) = (void *)_BOOTROM_MEMBOOT;
 128        BOOTROM_MEM(addr, 0, 0, NULL);
 129
 130#endif
 131}
 132
 133/*
 134 * the bootldr command loads an address, checks to see if there
 135 *   is a Boot stream that the on-chip BOOTROM can understand,
 136 *   and loads it via the BOOTROM Callback. It is possible
 137 *   to also add booting from SPI, or TWI, but this function does
 138 *   not currently support that.
 139 */
 140int do_bootldr(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 141{
 142        void *addr;
 143
 144        /* Get the address */
 145        if (argc < 2)
 146                addr = (void *)load_addr;
 147        else
 148                addr = (void *)simple_strtoul(argv[1], NULL, 16);
 149
 150        /* Check if it is a LDR file */
 151        if (ldr_valid_signature(addr)) {
 152                printf("## Booting ldr image at 0x%p ...\n", addr);
 153                ldr_load(addr);
 154
 155                icache_disable();
 156                dcache_disable();
 157
 158                ldr_exec(addr);
 159        } else
 160                printf("## No ldr image at address 0x%p\n", addr);
 161
 162        return 0;
 163}
 164
 165U_BOOT_CMD(
 166        bootldr, 2, 0, do_bootldr,
 167        "boot ldr image from memory",
 168        "[addr]\n"
 169        ""
 170);
 171