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annotate src/ata.c @ 87:178d5a95e6de

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implementing ata read
author John Tsiombikas <nuclear@member.fsf.org>
date Wed, 07 Dec 2011 17:10:37 +0200
parents 379332fc1667
children a398bf73fe93
rev   line source
nuclear@78 1 #include <stdio.h>
nuclear@78 2 #include <stdlib.h>
nuclear@78 3 #include <string.h>
nuclear@83 4 #include <ctype.h>
nuclear@78 5 #include <inttypes.h>
nuclear@78 6 #include <assert.h>
nuclear@78 7 #include "ata.h"
nuclear@78 8 #include "intr.h"
nuclear@78 9 #include "asmops.h"
nuclear@87 10 #include "sched.h"
nuclear@86 11 #include "mutex.h"
nuclear@78 12
nuclear@78 13 /* registers */
nuclear@78 14 #define REG_DATA 0 /* R/W */
nuclear@78 15 #define REG_ERROR 1 /* R */
nuclear@78 16 #define REG_FEATURES 1 /* W */
nuclear@78 17 #define REG_COUNT 2 /* R/W */
nuclear@78 18 #define REG_LBA0 3 /* R/W */
nuclear@78 19 #define REG_LBA1 4 /* R/W */
nuclear@78 20 #define REG_LBA2 5 /* R/W */
nuclear@78 21 #define REG_DEVICE 6 /* R/W */
nuclear@78 22 #define REG_CMD 7 /* W */
nuclear@78 23 #define REG_STATUS 7 /* R */
nuclear@78 24
nuclear@78 25 #define REG_CTL 518
nuclear@78 26 #define REG_ALTSTAT 518
nuclear@78 27
nuclear@78 28 /* status bit fields */
nuclear@78 29 #define ST_ERR (1 << 0)
nuclear@78 30 #define ST_DRQ (1 << 3)
nuclear@78 31 #define ST_DRDY (1 << 6)
nuclear@78 32 #define ST_BSY (1 << 7)
nuclear@78 33
nuclear@78 34 /* device select bit in control register */
nuclear@78 35 #define DEV_SEL(x) (((x) & 1) << 4)
nuclear@86 36 #define DEV_LBA (1 << 6)
nuclear@78 37
nuclear@78 38 /* ATA commands */
nuclear@78 39 #define CMD_IDENTIFY 0xec
nuclear@86 40 #define CMD_READ 0x20
nuclear@86 41 #define CMD_READ48 0x24
nuclear@86 42 #define CMD_WRITE 0x30
nuclear@86 43 #define CMD_WRITE48 0x34
nuclear@78 44
nuclear@78 45
nuclear@78 46 struct device {
nuclear@78 47 int id; /* id of the device on its ATA interface (0 master, 1 slave) */
nuclear@78 48 int iface; /* ATA interface for this device (0 or 1) */
nuclear@78 49 int port_base; /* interface I/O port base */
nuclear@78 50
nuclear@78 51 uint32_t nsect_lba;
nuclear@78 52 uint64_t nsect_lba48;
nuclear@78 53 };
nuclear@78 54
nuclear@78 55
nuclear@78 56 static int identify(struct device *dev, int iface, int id);
nuclear@78 57 static void select_dev(struct device *dev);
nuclear@78 58 static int wait_busy(struct device *dev);
nuclear@78 59 static int wait_drq(struct device *dev);
nuclear@78 60 static void read_data(struct device *dev, void *buf);
nuclear@78 61 static inline uint8_t read_reg8(struct device *dev, int reg);
nuclear@78 62 static inline uint16_t read_reg16(struct device *dev, int reg);
nuclear@78 63 static inline void write_reg8(struct device *dev, int reg, uint8_t val);
nuclear@78 64 static inline void write_reg16(struct device *dev, int reg, uint16_t val);
nuclear@78 65 static void ata_intr(int inum);
nuclear@80 66 static void *atastr(void *res, void *src, int n);
nuclear@78 67 static char *size_str(uint64_t nsect, char *buf);
nuclear@87 68 static void print_error(int devid, int wr, uint32_t high, uint32_t low, unsigned char err);
nuclear@78 69
nuclear@78 70 /* last drive selected on each bus */
nuclear@78 71 static int drvsel[2] = {-1, -1};
nuclear@78 72
nuclear@78 73 /* 4 possible devices: 2 ATA interfaces with 2 devices each.
nuclear@78 74 * this will never change unless we start querying the PCI config space
nuclear@78 75 * for additional drives (in which case this whole init code must be
nuclear@78 76 * rewritten anyway), but I like it spelt out like this.
nuclear@78 77 */
nuclear@78 78 #define MAX_IFACES 2
nuclear@78 79 #define MAX_DEV (MAX_IFACES * 2)
nuclear@86 80 static struct device devices[MAX_DEV];
nuclear@86 81
nuclear@86 82 static int use_irq;
nuclear@86 83
nuclear@86 84 /* This serves as a sync point for I/O. While the mutex is held,
nuclear@86 85 * some process is doing I/O and all the others must wait.
nuclear@86 86 */
nuclear@86 87 static mutex_t pending;
nuclear@78 88
nuclear@78 89
nuclear@78 90 void init_ata(void)
nuclear@78 91 {
nuclear@78 92 int i;
nuclear@78 93
nuclear@78 94 interrupt(IRQ_TO_INTR(15), ata_intr);
nuclear@78 95
nuclear@78 96 for(i=0; i<MAX_DEV; i++) {
nuclear@78 97 int iface = i / MAX_IFACES;
nuclear@78 98 int id = i % MAX_IFACES;
nuclear@78 99
nuclear@86 100 if(identify(devices + i, iface, id) == -1) {
nuclear@86 101 devices[i].id = -1;
nuclear@78 102 }
nuclear@78 103 }
nuclear@86 104
nuclear@86 105 /* init code done, from now on use the irq sleep/wakeup mechanism */
nuclear@86 106 use_irq = 1;
nuclear@86 107 }
nuclear@86 108
nuclear@86 109 int ata_read_pio(int devno, uint64_t sect, void *buf)
nuclear@86 110 {
nuclear@86 111 int cmd, st, res = -1;
nuclear@87 112 uint32_t sect_low, sect_high;
nuclear@87 113 struct device *dev = devices + devno;
nuclear@86 114
nuclear@86 115 if(dev->id == -1) {
nuclear@86 116 return -1;
nuclear@86 117 }
nuclear@86 118
nuclear@86 119 if(use_irq) {
nuclear@86 120 /* wait for the interface to become available */
nuclear@86 121 mutex_lock(&pending);
nuclear@86 122 }
nuclear@86 123
nuclear@86 124 select_dev(dev);
nuclear@86 125
nuclear@86 126 /* LBA48 requires the high-order bits first */
nuclear@86 127 if(sect >= dev->nsect_lba) {
nuclear@87 128 sect_high = (uint32_t)(sect >> 24);
nuclear@86 129 sect_low = (uint32_t)sect & 0xffffff;
nuclear@86 130
nuclear@86 131 if(sect >= dev->nsect_lba48) {
nuclear@86 132 goto end;
nuclear@86 133 }
nuclear@86 134 cmd = CMD_READ48;
nuclear@86 135
nuclear@86 136 write_reg8(dev, REG_COUNT, 0);
nuclear@86 137 write_reg8(dev, REG_LBA0, sect_high & 0xff);
nuclear@86 138 write_reg8(dev, REG_LBA1, (sect_high >> 8) & 0xff);
nuclear@86 139 write_reg8(dev, REG_LBA2, (sect_high >> 16) & 0xff);
nuclear@86 140 } else {
nuclear@86 141 cmd = CMD_READ;
nuclear@87 142 sect_high = 0;
nuclear@87 143 sect_low = (uint32_t)sect & 0xfffffff;
nuclear@86 144 }
nuclear@86 145
nuclear@86 146 write_reg8(dev, REG_COUNT, 1);
nuclear@86 147 write_reg8(dev, REG_LBA0, sect_low & 0xff);
nuclear@86 148 write_reg8(dev, REG_LBA1, (sect_low >> 8) & 0xff);
nuclear@86 149 write_reg8(dev, REG_LBA2, (sect_low >> 16) & 0xff);
nuclear@87 150 write_reg8(dev, REG_DEVICE, ((sect_low >> 24) & 0xf) | DEV_LBA | DEV_SEL(dev->id));
nuclear@86 151 /* execute */
nuclear@86 152 write_reg8(dev, REG_CMD, cmd);
nuclear@86 153
nuclear@86 154 /* wait for the data to become available */
nuclear@86 155 do {
nuclear@86 156 if(use_irq) {
nuclear@86 157 /* also sleep on the mutex if we're called from userspace */
nuclear@86 158 wait(&pending);
nuclear@86 159 }
nuclear@87 160 } while(((st = read_reg8(dev, REG_ALTSTAT)) & (ST_DRQ | ST_ERR)) == 0);
nuclear@86 161
nuclear@86 162 if(st & ST_ERR) {
nuclear@87 163 //print_error(int devid, int wr, uint32_t high, uint32_t low, unsigned char err);
nuclear@87 164 unsigned char err;
nuclear@87 165
nuclear@87 166 err = read_reg8(dev, REG_ERROR);
nuclear@87 167 print_error(devno, 0, sect_high, sect_low, err);
nuclear@86 168 goto end;
nuclear@86 169 }
nuclear@86 170
nuclear@86 171 /* read the data and we're done */
nuclear@86 172 read_data(dev, buf);
nuclear@86 173 res = 0;
nuclear@86 174 end:
nuclear@86 175 if(use_irq) {
nuclear@86 176 mutex_unlock(&pending);
nuclear@86 177 }
nuclear@86 178 return res;
nuclear@86 179 }
nuclear@86 180
nuclear@86 181 int ata_write_pio(int devno, uint64_t sect, void *buf)
nuclear@86 182 {
nuclear@87 183 if(devices[devno].id == -1) {
nuclear@86 184 return -1;
nuclear@86 185 }
nuclear@87 186 return -1;
nuclear@78 187 }
nuclear@78 188
nuclear@78 189 static int identify(struct device *dev, int iface, int id)
nuclear@78 190 {
nuclear@78 191 /* base address of the two ATA interfaces */
nuclear@78 192 static const int port_base[] = {0x1f0, 0x170};
nuclear@78 193 unsigned char st;
nuclear@78 194 uint16_t *info;
nuclear@78 195 char textbuf[42]; /* at most we need 40 chars for ident strings */
nuclear@78 196
nuclear@78 197 dev->id = id;
nuclear@78 198 dev->iface = iface;
nuclear@78 199 dev->port_base = port_base[iface];
nuclear@78 200
nuclear@78 201 /* a status of 0xff means there's no drive on the interface */
nuclear@78 202 if((st = read_reg8(dev, REG_ALTSTAT)) == 0xff) {
nuclear@78 203 return -1;
nuclear@78 204 }
nuclear@78 205
nuclear@78 206 select_dev(dev);
nuclear@78 207
nuclear@78 208 write_reg8(dev, REG_CMD, CMD_IDENTIFY);
nuclear@78 209
nuclear@78 210 if(!(st = read_reg8(dev, REG_ALTSTAT)) || (st & ST_ERR)) {
nuclear@78 211 /* does not exist */
nuclear@78 212 return -1;
nuclear@78 213 }
nuclear@78 214 if(wait_busy(dev) == -1) {
nuclear@78 215 /* got ST_ERR, not ATA */
nuclear@78 216 return -1;
nuclear@78 217 }
nuclear@78 218
nuclear@78 219 info = malloc(512);
nuclear@78 220 assert(info);
nuclear@78 221
nuclear@78 222 /* read the device information */
nuclear@78 223 read_data(dev, info);
nuclear@78 224
nuclear@78 225 /* print model and serial */
nuclear@83 226 printf("ata%d: %s", (dev->iface << 1) | dev->id, atastr(textbuf, info + 27, 40));
nuclear@83 227 printf(" [s/n: %s]", atastr(textbuf, info + 10, 20));
nuclear@78 228
nuclear@78 229 dev->nsect_lba = *(uint32_t*)(info + 60);
nuclear@78 230 dev->nsect_lba48 = *(uint64_t*)(info + 100) & 0xffffffffffffull;
nuclear@78 231
nuclear@78 232 if(!dev->nsect_lba) {
nuclear@78 233 printf(" drive does not support LBA, ignoring!\n");
nuclear@78 234 free(info);
nuclear@78 235 return -1;
nuclear@78 236 }
nuclear@78 237
nuclear@78 238 if(dev->nsect_lba48) {
nuclear@78 239 size_str(dev->nsect_lba48, textbuf);
nuclear@78 240 } else {
nuclear@78 241 size_str(dev->nsect_lba, textbuf);
nuclear@78 242 }
nuclear@83 243 printf(" size: %s\n", textbuf);
nuclear@78 244
nuclear@78 245 free(info);
nuclear@78 246 return 0;
nuclear@78 247 }
nuclear@78 248
nuclear@78 249 static void select_dev(struct device *dev)
nuclear@78 250 {
nuclear@78 251 /* if this is the currently selected device, thy work is done */
nuclear@78 252 if(drvsel[dev->iface] == dev->id)
nuclear@78 253 return;
nuclear@78 254
nuclear@78 255 /* wait for BSY and DRQ to clear */
nuclear@78 256 while(read_reg8(dev, REG_ALTSTAT) & (ST_BSY | ST_DRQ));
nuclear@78 257
nuclear@78 258 /* set the correct device bit to the device register */
nuclear@78 259 write_reg8(dev, REG_DEVICE, DEV_SEL(dev->id));
nuclear@86 260
nuclear@86 261 /* wait a bit to allow the device time to respond */
nuclear@86 262 iodelay(); iodelay(); iodelay(); iodelay();
nuclear@78 263 }
nuclear@78 264
nuclear@78 265 static int wait_busy(struct device *dev)
nuclear@78 266 {
nuclear@78 267 unsigned char st;
nuclear@78 268
nuclear@78 269 do {
nuclear@78 270 st = read_reg8(dev, REG_ALTSTAT);
nuclear@78 271 } while((st & ST_BSY) && !(st & ST_ERR));
nuclear@78 272
nuclear@78 273 return st & ST_ERR ? -1 : 0;
nuclear@78 274 }
nuclear@78 275
nuclear@78 276 static int wait_drq(struct device *dev)
nuclear@78 277 {
nuclear@78 278 unsigned char st;
nuclear@78 279
nuclear@78 280 do {
nuclear@78 281 st = read_reg8(dev, REG_ALTSTAT);
nuclear@78 282 } while(!(st & (ST_DRQ | ST_ERR)));
nuclear@78 283
nuclear@78 284 return st & ST_ERR ? -1 : 0;
nuclear@78 285 }
nuclear@78 286
nuclear@78 287 static void read_data(struct device *dev, void *buf)
nuclear@78 288 {
nuclear@78 289 int i;
nuclear@78 290 uint16_t *ptr = buf;
nuclear@78 291
nuclear@78 292 /* wait for the data request from the drive */
nuclear@78 293 wait_drq(dev);
nuclear@78 294
nuclear@78 295 /* ready to transfer */
nuclear@78 296 for(i=0; i<256; i++) {
nuclear@78 297 *ptr++ = read_reg16(dev, REG_DATA);
nuclear@78 298 }
nuclear@78 299 }
nuclear@78 300
nuclear@78 301 static inline uint8_t read_reg8(struct device *dev, int reg)
nuclear@78 302 {
nuclear@78 303 uint8_t val;
nuclear@78 304 inb(val, dev->port_base + reg);
nuclear@78 305 return val;
nuclear@78 306 }
nuclear@78 307
nuclear@78 308 static inline uint16_t read_reg16(struct device *dev, int reg)
nuclear@78 309 {
nuclear@78 310 uint16_t val;
nuclear@78 311 inw(val, dev->port_base + reg);
nuclear@78 312 return val;
nuclear@78 313 }
nuclear@78 314
nuclear@78 315 static inline void write_reg8(struct device *dev, int reg, uint8_t val)
nuclear@78 316 {
nuclear@78 317 outb(val, dev->port_base + reg);
nuclear@78 318 }
nuclear@78 319
nuclear@78 320 static inline void write_reg16(struct device *dev, int reg, uint16_t val)
nuclear@78 321 {
nuclear@78 322 outw(val, dev->port_base + reg);
nuclear@78 323 }
nuclear@78 324
nuclear@78 325 static void ata_intr(int inum)
nuclear@78 326 {
nuclear@78 327 printf("ATA interrupt\n");
nuclear@78 328 }
nuclear@78 329
nuclear@80 330 static void *atastr(void *res, void *src, int n)
nuclear@80 331 {
nuclear@80 332 int i;
nuclear@80 333 uint16_t *sptr = (uint16_t*)src;
nuclear@80 334 char *dptr = res;
nuclear@80 335
nuclear@80 336 for(i=0; i<n/2; i++) {
nuclear@80 337 *dptr++ = (*sptr & 0xff00) >> 8;
nuclear@80 338 *dptr++ = *sptr++ & 0xff;
nuclear@80 339 }
nuclear@83 340
nuclear@83 341 while(isspace(*--dptr));
nuclear@83 342 *++dptr = 0;
nuclear@80 343 return res;
nuclear@80 344 }
nuclear@80 345
nuclear@78 346 static char *size_str(uint64_t nsect, char *buf)
nuclear@78 347 {
nuclear@78 348 static const char *suffix[] = {"kb", "mb", "gb", "tb", "pb", 0};
nuclear@78 349 int i;
nuclear@82 350 unsigned int rem;
nuclear@78 351
nuclear@78 352 /* start with kilobytes */
nuclear@78 353 nsect /= 2;
nuclear@78 354
nuclear@78 355 for(i=0; nsect >= 1024 && suffix[i + 1]; i++) {
nuclear@82 356 rem = nsect % 1024;
nuclear@78 357 nsect /= 1024;
nuclear@78 358 }
nuclear@82 359 sprintf(buf, "%u.%u%s", (unsigned int)nsect, 100 * rem / 1024, suffix[i]);
nuclear@78 360 return buf;
nuclear@78 361 }
nuclear@78 362
nuclear@87 363 #define ERR_NM (1 << 1)
nuclear@87 364 #define ERR_ABRT (1 << 2)
nuclear@87 365 #define ERR_MCR (1 << 3)
nuclear@87 366 #define ERR_IDNF (1 << 4)
nuclear@87 367 #define ERR_MC (1 << 5)
nuclear@87 368 #define ERR_UNC (1 << 6)
nuclear@87 369
nuclear@87 370 static void print_error(int devid, int wr, uint32_t high, uint32_t low, unsigned char err)
nuclear@87 371 {
nuclear@87 372 printf("ata%d %s %serror ", devid, wr ? "write" : "read", err & ERR_UNC ? "uncorrectable " : "");
nuclear@87 373 printf("at sector %x%x: ", high, low);
nuclear@87 374
nuclear@87 375 if(err & ERR_ABRT)
nuclear@87 376 printf("abort ");
nuclear@87 377 if(err & ERR_IDNF)
nuclear@87 378 printf("invalid address ");
nuclear@87 379 if(err & ERR_NM)
nuclear@87 380 printf("no media ");
nuclear@87 381
nuclear@87 382 printf("(%x)\n", (unsigned int)err);
nuclear@87 383 }