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Mike Frysinger86a20fb2008-02-16 07:40:36 -05001/*
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
Mike Frysinger29d4ea02008-10-11 22:08:42 -040019/* 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 */
Mike Frysinger31488a62010-12-26 12:34:08 -050027 if (data[3] == (GFLAG_56X_SIGN_MAGIC << (GFLAG_56X_SIGN_SHIFT - 24)))
Mike Frysinger29d4ea02008-10-11 22:08:42 -040028 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 */
Mike Frysinger29d4ea02008-10-11 22:08:42 -040056static 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
Mike Frysinger29d4ea02008-10-11 22:08:42 -040062 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));
Mike Frysinger31488a62010-12-26 12:34:08 -050074 bfin_write_EVT1(flags & BFLAG_53X_RESVECT ? 0xFFA00000 : 0xFFA08000);
Mike Frysinger29d4ea02008-10-11 22:08:42 -040075
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
Mike Frysinger31488a62010-12-26 12:34:08 -050083 printf("loading to 0x%08x (%#x bytes) flags: 0x%04x\n",
Mike Frysinger29d4ea02008-10-11 22:08:42 -040084 addr, count, flags);
85
Mike Frysinger31488a62010-12-26 12:34:08 -050086 if (!(flags & BFLAG_53X_IGNORE)) {
87 if (flags & BFLAG_53X_ZEROFILL)
Mike Frysinger29d4ea02008-10-11 22:08:42 -040088 memset((void *)addr, 0x00, count);
89 else
90 memcpy((void *)addr, base_addr, count);
91
Mike Frysinger31488a62010-12-26 12:34:08 -050092 if (flags & BFLAG_53X_INIT) {
Mike Frysinger29d4ea02008-10-11 22:08:42 -040093 void (*init)(void) = (void *)addr;
94 init();
95 }
96 }
97
Mike Frysinger31488a62010-12-26 12:34:08 -050098 if (!(flags & BFLAG_53X_ZEROFILL))
Mike Frysinger29d4ea02008-10-11 22:08:42 -040099 base_addr += count;
Mike Frysinger31488a62010-12-26 12:34:08 -0500100 } while (!(flags & BFLAG_53X_FINAL));
Mike Frysinger29d4ea02008-10-11 22:08:42 -0400101
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
Mike Frysingerfe033ad2008-10-12 06:02:55 -0400122 void (*ldr_entry)(void) = (void *)bfin_read_EVT1();
Mike Frysinger29d4ea02008-10-11 22:08:42 -0400123 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
Mike Frysinger86a20fb2008-02-16 07:40:36 -0500133/*
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 */
Wolfgang Denk54841ab2010-06-28 22:00:46 +0200140int do_bootldr(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
Mike Frysinger86a20fb2008-02-16 07:40:36 -0500141{
142 void *addr;
Mike Frysinger86a20fb2008-02-16 07:40:36 -0500143
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 */
Mike Frysinger29d4ea02008-10-11 22:08:42 -0400151 if (ldr_valid_signature(addr)) {
Mike Frysinger86a20fb2008-02-16 07:40:36 -0500152 printf("## Booting ldr image at 0x%p ...\n", addr);
Mike Frysinger29d4ea02008-10-11 22:08:42 -0400153 ldr_load(addr);
Mike Frysinger86a20fb2008-02-16 07:40:36 -0500154
155 icache_disable();
156 dcache_disable();
157
Mike Frysinger29d4ea02008-10-11 22:08:42 -0400158 ldr_exec(addr);
Mike Frysinger86a20fb2008-02-16 07:40:36 -0500159 } else
160 printf("## No ldr image at address 0x%p\n", addr);
161
162 return 0;
163}
164
Frans Meulenbroeks388a29d2010-07-31 15:01:53 +0200165U_BOOT_CMD(
166 bootldr, 2, 0, do_bootldr,
Peter Tyser2fb26042009-01-27 18:03:12 -0600167 "boot ldr image from memory",
Mike Frysinger86a20fb2008-02-16 07:40:36 -0500168 "[addr]\n"
Wolfgang Denka89c33d2009-05-24 17:06:54 +0200169 ""
170);