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| Source at commit 30c683effd7ab362d1517950700c96cfa09e45e8 created 11 years 17 days ago. By Werner Almesberger, tornado/fw/sim/p: pass arguments to "alg"; label graphs; better separate "up" | |
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| 1 | /* |
| 2 | * fw/mmc.c - MMC card access |
| 3 | * |
| 4 | * Written 2012 by Werner Almesberger |
| 5 | * Copyright 2012 Werner Almesberger |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | /* |
| 14 | * Heavily influenced by the MMC driver in the Mass Storage for V-USB project |
| 15 | * by "lleeloo": |
| 16 | * http://we.easyelectronics.ru/AVR/usb-fleshka-na-atmega8-i-v-usb-ot-idei-k-gotovomu-ustroystvu.html |
| 17 | */ |
| 18 | |
| 19 | #include <stdbool.h> |
| 20 | #include <stdint.h> |
| 21 | |
| 22 | #include "delay.h" |
| 23 | #include "mmc-hw.h" |
| 24 | #include "mmc.h" |
| 25 | |
| 26 | |
| 27 | #ifdef AVR |
| 28 | |
| 29 | #define DEBUG(fmt, ...) |
| 30 | |
| 31 | #else /* AVR */ |
| 32 | |
| 33 | #include <stdio.h> |
| 34 | |
| 35 | #define DEBUG(fmt, ...) fprintf(stderr, fmt "\n", __VA_ARGS__) |
| 36 | |
| 37 | #endif /* !AVR */ |
| 38 | |
| 39 | |
| 40 | /* Command indices */ |
| 41 | |
| 42 | enum { |
| 43 | MMC_GO_IDLE_STATE = 0, |
| 44 | MMC_SEND_OP_COND = 1, |
| 45 | MMC_SET_BLOCKLEN = 16, |
| 46 | MMC_READ_SINGLE_BLOCK = 17, |
| 47 | MMC_WRITE_BLOCK = 24, |
| 48 | }; |
| 49 | |
| 50 | |
| 51 | /* Start block tokens */ |
| 52 | |
| 53 | enum { |
| 54 | MMC_START_SINGLE_BLOCK = 0xfe, |
| 55 | }; |
| 56 | |
| 57 | |
| 58 | static void mmc_begin(void) |
| 59 | { |
| 60 | mmc_select(); |
| 61 | } |
| 62 | |
| 63 | |
| 64 | static void mmc_end(void) |
| 65 | { |
| 66 | mmc_send(0xff); |
| 67 | mmc_send(0xff); |
| 68 | mmc_deselect(); |
| 69 | mmc_send(0xff); |
| 70 | } |
| 71 | |
| 72 | static void mmc_command(uint8_t cmd, uint32_t arg) |
| 73 | { |
| 74 | mmc_send(0x40 | cmd); /* start (0)+transmission(1)+cmd */ |
| 75 | mmc_send(arg >> 24); |
| 76 | mmc_send(arg >> 16); |
| 77 | mmc_send(arg >> 8); |
| 78 | mmc_send(arg); |
| 79 | mmc_send(0x95); /* crc7+end(1) */ |
| 80 | } |
| 81 | |
| 82 | |
| 83 | static uint8_t mmc_r1(void) |
| 84 | { |
| 85 | uint8_t v, tries = 0xff; |
| 86 | |
| 87 | do v = mmc_recv(); |
| 88 | while ((v & 0x80) && --tries); |
| 89 | return v; |
| 90 | } |
| 91 | |
| 92 | |
| 93 | static bool mmc_wait(void) |
| 94 | { |
| 95 | uint8_t v, tries = 0xff; |
| 96 | |
| 97 | do { |
| 98 | v = mmc_recv(); |
| 99 | if (v == MMC_START_SINGLE_BLOCK) |
| 100 | return 1; |
| 101 | _delay_ms(1); |
| 102 | } |
| 103 | while (--tries); |
| 104 | return 0; |
| 105 | } |
| 106 | |
| 107 | |
| 108 | bool mmc_begin_read(uint32_t addr) |
| 109 | { |
| 110 | uint8_t res; |
| 111 | |
| 112 | mmc_begin(); |
| 113 | mmc_command(MMC_READ_SINGLE_BLOCK, addr); |
| 114 | res = mmc_r1(); |
| 115 | DEBUG("mmc_begin_read: r1 = 0x%02x", res); |
| 116 | if (res) { |
| 117 | mmc_end(); |
| 118 | return 0; |
| 119 | } else { |
| 120 | return mmc_wait(); |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | |
| 125 | uint8_t mmc_read(void) |
| 126 | { |
| 127 | return mmc_recv(); |
| 128 | } |
| 129 | |
| 130 | |
| 131 | bool mmc_end_read(void) |
| 132 | { |
| 133 | mmc_end(); |
| 134 | return 1; |
| 135 | } |
| 136 | |
| 137 | |
| 138 | bool mmc_begin_write(uint32_t addr) |
| 139 | { |
| 140 | uint8_t res; |
| 141 | |
| 142 | mmc_begin(); |
| 143 | mmc_command(MMC_WRITE_BLOCK, addr); |
| 144 | res = mmc_r1(); |
| 145 | DEBUG("mmc_begin_write: r1 = 0x%02x", res); |
| 146 | if (res) { |
| 147 | mmc_end(); |
| 148 | return 0; |
| 149 | } else { |
| 150 | mmc_send(0xff); |
| 151 | mmc_send(0xff); |
| 152 | mmc_send(MMC_START_SINGLE_BLOCK); |
| 153 | return 1; |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | |
| 158 | void mmc_write(uint8_t data) |
| 159 | { |
| 160 | mmc_send(data); |
| 161 | } |
| 162 | |
| 163 | |
| 164 | bool mmc_end_write(void) |
| 165 | { |
| 166 | mmc_send(0xff); |
| 167 | mmc_send(0xff); |
| 168 | mmc_recv(); |
| 169 | while (!mmc_recv()); |
| 170 | mmc_end(); |
| 171 | return 1; |
| 172 | } |
| 173 | |
| 174 | |
| 175 | void mmc_off(void) |
| 176 | { |
| 177 | mmc_deactivate(); |
| 178 | } |
| 179 | |
| 180 | |
| 181 | static void send_clock(void) |
| 182 | { |
| 183 | uint8_t i; |
| 184 | |
| 185 | for (i = 0; i != 10; i++) |
| 186 | mmc_send(0xff); |
| 187 | } |
| 188 | |
| 189 | |
| 190 | bool mmc_init(void) |
| 191 | { |
| 192 | uint16_t tries = 0xff; |
| 193 | uint8_t res; |
| 194 | |
| 195 | mmc_activate(); |
| 196 | send_clock(); |
| 197 | mmc_begin(); |
| 198 | |
| 199 | do { |
| 200 | mmc_command(MMC_GO_IDLE_STATE, 0); |
| 201 | if (mmc_r1() == 0x01) /* in idle state */ |
| 202 | break; |
| 203 | } |
| 204 | while (--tries); |
| 205 | mmc_end(); |
| 206 | if (!tries) |
| 207 | return 0; |
| 208 | |
| 209 | send_clock(); |
| 210 | |
| 211 | tries = 0x7ff; |
| 212 | do { |
| 213 | mmc_select(); |
| 214 | mmc_command(MMC_SEND_OP_COND, 0); |
| 215 | res = mmc_r1(); |
| 216 | mmc_deselect(); |
| 217 | send_clock(); |
| 218 | } |
| 219 | while (res && --tries); |
| 220 | |
| 221 | mmc_end(); |
| 222 | |
| 223 | if (res) { |
| 224 | mmc_deactivate(); |
| 225 | return 0; |
| 226 | } |
| 227 | |
| 228 | mmc_begin(); |
| 229 | mmc_command(MMC_SET_BLOCKLEN, MMC_BLOCK); |
| 230 | mmc_r1(); |
| 231 | mmc_end(); |
| 232 | |
| 233 | return 1; |
| 234 | } |
| 235 | |
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