FreeCalypso > hg > freecalypso-tools

annotate target-utils/loadagent/amdflash.c @ 667:2772cf8435b4

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CHANGES: binary protocol for flash programming operations
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 07 Mar 2020 19:43:10 +0000
parents b34384991094
children
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1 /*
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2 * This module implements the AMFB and AMFW commands for programming
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3 * AMD-style flash memories. Syntax:
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4 *
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5 * AMFB <baseaddr> -- sets the base address for subsequent AMFW commands
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6 * AMFW <offset> <hexstring> -- the actual flash write operation
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7 *
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8 * The flash memory is assumed to be 16 bits wide. The hex string
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9 * argument to the AMFW command is just data, with no header, address,
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10 * length, checksum or other additions. The number of hex digits in the
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11 * string must be a multiple of 4, and the byte order is the same as
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12 * that of TI's *.m0 files: we interpret the string as consisting of
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13 * 16-bit words rather than bytes.
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14 *
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15 * The address to which each flash write is directed is the sum of the
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16 * base given to AMFB and the offset given to AMFW. The fixed offsets
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17 * of 0xAAA and 0x554 (0x555 and 0x2AA in words) prescribed for the flash
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18 * programming command sequence are also made from the base set with AMFB.
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19 */
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20
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21 #include <sys/types.h>
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22 #include "types.h"
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23
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24 static u32 base_addr;
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25
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26 void
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27 cmd_AMFB(argbulk)
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28 char *argbulk;
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29 {
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30 char *argv[2];
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31 u_long addr;
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32
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33 if (parse_args(argbulk, 1, 1, argv, 0) < 0)
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34 return;
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35 if (parse_hexarg(argv[0], 8, &addr) < 0) {
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36 printf("ERROR: argument must be a valid 32-bit hex address\n");
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37 return;
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38 }
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39 if (addr & 1) {
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40 printf("ERROR: odd address\n");
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41 return;
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42 }
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43 base_addr = addr;
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44 }
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45
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46 void
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47 cmd_AMFW(argbulk)
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48 char *argbulk;
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49 {
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50 char *argv[3], *s;
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51 u_long offset;
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52 volatile u16 *flashptr;
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53 u32 datum; /* needs to be u32 for decode_hex_digits() */
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54 int i;
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55
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56 if (parse_args(argbulk, 2, 2, argv, 0) < 0)
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57 return;
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58 if (parse_hexarg(argv[0], 8, &offset) < 0) {
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59 printf("ERROR: offset argument must a valid 32-bit hex value\n");
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60 return;
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61 }
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62 if (offset & 1) {
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63 printf("ERROR: odd offset argument\n");
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64 return;
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65 }
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66 flashptr = (volatile u16 *)(base_addr + offset);
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67 for (s = argv[1]; *s; flashptr++, s += 4) {
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68 if (decode_hex_digits(s, 4, &datum) < 0) {
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69 printf("ERROR: bad AMFW hex string argument\n");
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70 return;
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71 }
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72 if (*flashptr != 0xFFFF) {
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73 printf("ERROR: flash not blank at %08X\n",
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74 (u_long) flashptr);
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75 return;
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76 }
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77 *(volatile u16 *)(base_addr + 0xAAA) = 0xAA;
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78 *(volatile u16 *)(base_addr + 0x554) = 0x55;
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79 *(volatile u16 *)(base_addr + 0xAAA) = 0xA0;
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80 *flashptr = datum;
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81 for (i = 10000; i; i--)
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82 if (*flashptr == datum)
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83 break;
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84 if (!i) {
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85 printf("ERROR: flash write timeout at %08X\n",
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86 (u_long) flashptr);
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87 return;
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88 }
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89 }
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90 }
659
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91
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92 amdflash_binary_prog(offset, nwords, data)
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93 u32 offset;
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94 unsigned nwords;
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95 u16 *data;
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96 {
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97 volatile u16 *flashptr;
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98 int i;
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99
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100 flashptr = (volatile u16 *)(base_addr + offset);
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101 while (nwords) {
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102 if (*flashptr != 0xFFFF) {
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103 serial_out(0x15); /* NAK */
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104 printf("ERROR: flash not blank at %08X\n",
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105 (u_long) flashptr);
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106 return(-1);
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107 }
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108 *(volatile u16 *)(base_addr + 0xAAA) = 0xAA;
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109 *(volatile u16 *)(base_addr + 0x554) = 0x55;
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110 *(volatile u16 *)(base_addr + 0xAAA) = 0xA0;
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111 *flashptr = *data;
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112 for (i = 10000; i; i--)
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113 if (*flashptr == *data)
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114 break;
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115 if (!i) {
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116 serial_out(0x15); /* NAK */
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117 printf("ERROR: flash write timeout at %08X\n",
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118 (u_long) flashptr);
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119 return(-1);
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120 }
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121 flashptr++;
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122 data++;
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123 nwords--;
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124 }
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125 return(0);
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126 }
660
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127
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128 void
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129 cmd_AMFWB()
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130 {
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131 binary_flash_prog_main(amdflash_binary_prog);
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132 }