ide-probe.c 43 KB

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  1. /*
  2. * Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
  3. * Copyright (C) 2005, 2007 Bartlomiej Zolnierkiewicz
  4. */
  5. /*
  6. * Mostly written by Mark Lord <mlord@pobox.com>
  7. * and Gadi Oxman <gadio@netvision.net.il>
  8. * and Andre Hedrick <andre@linux-ide.org>
  9. *
  10. * See linux/MAINTAINERS for address of current maintainer.
  11. *
  12. * This is the IDE probe module, as evolved from hd.c and ide.c.
  13. *
  14. * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
  15. * by Andrea Arcangeli
  16. */
  17. #include <linux/module.h>
  18. #include <linux/types.h>
  19. #include <linux/string.h>
  20. #include <linux/kernel.h>
  21. #include <linux/timer.h>
  22. #include <linux/mm.h>
  23. #include <linux/interrupt.h>
  24. #include <linux/major.h>
  25. #include <linux/errno.h>
  26. #include <linux/genhd.h>
  27. #include <linux/slab.h>
  28. #include <linux/delay.h>
  29. #include <linux/ide.h>
  30. #include <linux/spinlock.h>
  31. #include <linux/kmod.h>
  32. #include <linux/pci.h>
  33. #include <linux/scatterlist.h>
  34. #include <asm/byteorder.h>
  35. #include <asm/irq.h>
  36. #include <asm/uaccess.h>
  37. #include <asm/io.h>
  38. /**
  39. * generic_id - add a generic drive id
  40. * @drive: drive to make an ID block for
  41. *
  42. * Add a fake id field to the drive we are passed. This allows
  43. * use to skip a ton of NULL checks (which people always miss)
  44. * and make drive properties unconditional outside of this file
  45. */
  46. static void generic_id(ide_drive_t *drive)
  47. {
  48. u16 *id = drive->id;
  49. id[ATA_ID_CUR_CYLS] = id[ATA_ID_CYLS] = drive->cyl;
  50. id[ATA_ID_CUR_HEADS] = id[ATA_ID_HEADS] = drive->head;
  51. id[ATA_ID_CUR_SECTORS] = id[ATA_ID_SECTORS] = drive->sect;
  52. }
  53. static void ide_disk_init_chs(ide_drive_t *drive)
  54. {
  55. u16 *id = drive->id;
  56. /* Extract geometry if we did not already have one for the drive */
  57. if (!drive->cyl || !drive->head || !drive->sect) {
  58. drive->cyl = drive->bios_cyl = id[ATA_ID_CYLS];
  59. drive->head = drive->bios_head = id[ATA_ID_HEADS];
  60. drive->sect = drive->bios_sect = id[ATA_ID_SECTORS];
  61. }
  62. /* Handle logical geometry translation by the drive */
  63. if (ata_id_current_chs_valid(id)) {
  64. drive->cyl = id[ATA_ID_CUR_CYLS];
  65. drive->head = id[ATA_ID_CUR_HEADS];
  66. drive->sect = id[ATA_ID_CUR_SECTORS];
  67. }
  68. /* Use physical geometry if what we have still makes no sense */
  69. if (drive->head > 16 && id[ATA_ID_HEADS] && id[ATA_ID_HEADS] <= 16) {
  70. drive->cyl = id[ATA_ID_CYLS];
  71. drive->head = id[ATA_ID_HEADS];
  72. drive->sect = id[ATA_ID_SECTORS];
  73. }
  74. }
  75. static void ide_disk_init_mult_count(ide_drive_t *drive)
  76. {
  77. u16 *id = drive->id;
  78. u8 max_multsect = id[ATA_ID_MAX_MULTSECT] & 0xff;
  79. if (max_multsect) {
  80. #ifdef CONFIG_IDEDISK_MULTI_MODE
  81. if ((max_multsect / 2) > 1)
  82. id[ATA_ID_MULTSECT] = max_multsect | 0x100;
  83. else
  84. id[ATA_ID_MULTSECT] &= ~0x1ff;
  85. drive->mult_req = id[ATA_ID_MULTSECT] & 0xff;
  86. #endif
  87. if ((id[ATA_ID_MULTSECT] & 0x100) &&
  88. (id[ATA_ID_MULTSECT] & 0xff))
  89. drive->special.b.set_multmode = 1;
  90. }
  91. }
  92. /**
  93. * do_identify - identify a drive
  94. * @drive: drive to identify
  95. * @cmd: command used
  96. *
  97. * Called when we have issued a drive identify command to
  98. * read and parse the results. This function is run with
  99. * interrupts disabled.
  100. */
  101. static inline void do_identify (ide_drive_t *drive, u8 cmd)
  102. {
  103. ide_hwif_t *hwif = HWIF(drive);
  104. u16 *id = drive->id;
  105. char *m = (char *)&id[ATA_ID_PROD];
  106. int bswap = 1;
  107. /* read 512 bytes of id info */
  108. hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
  109. drive->id_read = 1;
  110. local_irq_enable();
  111. #ifdef DEBUG
  112. printk(KERN_INFO "%s: dumping identify data\n", drive->name);
  113. ide_dump_identify((u8 *)id);
  114. #endif
  115. ide_fix_driveid(id);
  116. /*
  117. * WIN_IDENTIFY returns little-endian info,
  118. * WIN_PIDENTIFY *usually* returns little-endian info.
  119. */
  120. if (cmd == WIN_PIDENTIFY) {
  121. if ((m[0] == 'N' && m[1] == 'E') || /* NEC */
  122. (m[0] == 'F' && m[1] == 'X') || /* Mitsumi */
  123. (m[0] == 'P' && m[1] == 'i')) /* Pioneer */
  124. /* Vertos drives may still be weird */
  125. bswap ^= 1;
  126. }
  127. ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
  128. ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
  129. ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
  130. /* we depend on this a lot! */
  131. m[ATA_ID_PROD_LEN - 1] = '\0';
  132. if (strstr(m, "E X A B Y T E N E S T"))
  133. goto err_misc;
  134. printk(KERN_INFO "%s: %s, ", drive->name, m);
  135. drive->present = 1;
  136. drive->dead = 0;
  137. /*
  138. * Check for an ATAPI device
  139. */
  140. if (cmd == WIN_PIDENTIFY) {
  141. u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;
  142. printk(KERN_CONT "ATAPI ");
  143. switch (type) {
  144. case ide_floppy:
  145. if (!strstr(m, "CD-ROM")) {
  146. if (!strstr(m, "oppy") &&
  147. !strstr(m, "poyp") &&
  148. !strstr(m, "ZIP"))
  149. printk(KERN_CONT "cdrom or floppy?, assuming ");
  150. if (drive->media != ide_cdrom) {
  151. printk(KERN_CONT "FLOPPY");
  152. drive->removable = 1;
  153. break;
  154. }
  155. }
  156. /* Early cdrom models used zero */
  157. type = ide_cdrom;
  158. case ide_cdrom:
  159. drive->removable = 1;
  160. #ifdef CONFIG_PPC
  161. /* kludge for Apple PowerBook internal zip */
  162. if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
  163. printk(KERN_CONT "FLOPPY");
  164. type = ide_floppy;
  165. break;
  166. }
  167. #endif
  168. printk(KERN_CONT "CD/DVD-ROM");
  169. break;
  170. case ide_tape:
  171. printk(KERN_CONT "TAPE");
  172. break;
  173. case ide_optical:
  174. printk(KERN_CONT "OPTICAL");
  175. drive->removable = 1;
  176. break;
  177. default:
  178. printk(KERN_CONT "UNKNOWN (type %d)", type);
  179. break;
  180. }
  181. printk(KERN_CONT " drive\n");
  182. drive->media = type;
  183. /* an ATAPI device ignores DRDY */
  184. drive->ready_stat = 0;
  185. return;
  186. }
  187. /*
  188. * Not an ATAPI device: looks like a "regular" hard disk
  189. */
  190. /*
  191. * 0x848a = CompactFlash device
  192. * These are *not* removable in Linux definition of the term
  193. */
  194. if (id[ATA_ID_CONFIG] != 0x848a && (id[ATA_ID_CONFIG] & (1 << 7)))
  195. drive->removable = 1;
  196. drive->media = ide_disk;
  197. printk(KERN_CONT "%s DISK drive\n",
  198. (id[ATA_ID_CONFIG] == 0x848a) ? "CFA" : "ATA");
  199. return;
  200. err_misc:
  201. kfree(id);
  202. drive->present = 0;
  203. return;
  204. }
  205. /**
  206. * actual_try_to_identify - send ata/atapi identify
  207. * @drive: drive to identify
  208. * @cmd: command to use
  209. *
  210. * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
  211. * and waits for a response. It also monitors irqs while this is
  212. * happening, in hope of automatically determining which one is
  213. * being used by the interface.
  214. *
  215. * Returns: 0 device was identified
  216. * 1 device timed-out (no response to identify request)
  217. * 2 device aborted the command (refused to identify itself)
  218. */
  219. static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
  220. {
  221. ide_hwif_t *hwif = HWIF(drive);
  222. struct ide_io_ports *io_ports = &hwif->io_ports;
  223. const struct ide_tp_ops *tp_ops = hwif->tp_ops;
  224. int use_altstatus = 0, rc;
  225. unsigned long timeout;
  226. u8 s = 0, a = 0;
  227. /* take a deep breath */
  228. msleep(50);
  229. if (io_ports->ctl_addr) {
  230. a = tp_ops->read_altstatus(hwif);
  231. s = tp_ops->read_status(hwif);
  232. if ((a ^ s) & ~INDEX_STAT)
  233. /* ancient Seagate drives, broken interfaces */
  234. printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
  235. "instead of ALTSTATUS(0x%02x)\n",
  236. drive->name, s, a);
  237. else
  238. /* use non-intrusive polling */
  239. use_altstatus = 1;
  240. }
  241. /* set features register for atapi
  242. * identify command to be sure of reply
  243. */
  244. if (cmd == WIN_PIDENTIFY) {
  245. ide_task_t task;
  246. memset(&task, 0, sizeof(task));
  247. /* disable DMA & overlap */
  248. task.tf_flags = IDE_TFLAG_OUT_FEATURE;
  249. tp_ops->tf_load(drive, &task);
  250. }
  251. /* ask drive for ID */
  252. tp_ops->exec_command(hwif, cmd);
  253. timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
  254. timeout += jiffies;
  255. do {
  256. if (time_after(jiffies, timeout)) {
  257. /* drive timed-out */
  258. return 1;
  259. }
  260. /* give drive a breather */
  261. msleep(50);
  262. s = use_altstatus ? tp_ops->read_altstatus(hwif)
  263. : tp_ops->read_status(hwif);
  264. } while (s & BUSY_STAT);
  265. /* wait for IRQ and DRQ_STAT */
  266. msleep(50);
  267. s = tp_ops->read_status(hwif);
  268. if (OK_STAT(s, DRQ_STAT, BAD_R_STAT)) {
  269. unsigned long flags;
  270. /* local CPU only; some systems need this */
  271. local_irq_save(flags);
  272. /* drive returned ID */
  273. do_identify(drive, cmd);
  274. /* drive responded with ID */
  275. rc = 0;
  276. /* clear drive IRQ */
  277. (void)tp_ops->read_status(hwif);
  278. local_irq_restore(flags);
  279. } else {
  280. /* drive refused ID */
  281. rc = 2;
  282. }
  283. return rc;
  284. }
  285. /**
  286. * try_to_identify - try to identify a drive
  287. * @drive: drive to probe
  288. * @cmd: command to use
  289. *
  290. * Issue the identify command and then do IRQ probing to
  291. * complete the identification when needed by finding the
  292. * IRQ the drive is attached to
  293. */
  294. static int try_to_identify (ide_drive_t *drive, u8 cmd)
  295. {
  296. ide_hwif_t *hwif = HWIF(drive);
  297. const struct ide_tp_ops *tp_ops = hwif->tp_ops;
  298. int retval;
  299. int autoprobe = 0;
  300. unsigned long cookie = 0;
  301. /*
  302. * Disable device irq unless we need to
  303. * probe for it. Otherwise we'll get spurious
  304. * interrupts during the identify-phase that
  305. * the irq handler isn't expecting.
  306. */
  307. if (hwif->io_ports.ctl_addr) {
  308. if (!hwif->irq) {
  309. autoprobe = 1;
  310. cookie = probe_irq_on();
  311. }
  312. tp_ops->set_irq(hwif, autoprobe);
  313. }
  314. retval = actual_try_to_identify(drive, cmd);
  315. if (autoprobe) {
  316. int irq;
  317. tp_ops->set_irq(hwif, 0);
  318. /* clear drive IRQ */
  319. (void)tp_ops->read_status(hwif);
  320. udelay(5);
  321. irq = probe_irq_off(cookie);
  322. if (!hwif->irq) {
  323. if (irq > 0) {
  324. hwif->irq = irq;
  325. } else {
  326. /* Mmmm.. multiple IRQs..
  327. * don't know which was ours
  328. */
  329. printk(KERN_ERR "%s: IRQ probe failed (0x%lx)\n",
  330. drive->name, cookie);
  331. }
  332. }
  333. }
  334. return retval;
  335. }
  336. static int ide_busy_sleep(ide_hwif_t *hwif)
  337. {
  338. unsigned long timeout = jiffies + WAIT_WORSTCASE;
  339. u8 stat;
  340. do {
  341. msleep(50);
  342. stat = hwif->tp_ops->read_status(hwif);
  343. if ((stat & BUSY_STAT) == 0)
  344. return 0;
  345. } while (time_before(jiffies, timeout));
  346. return 1;
  347. }
  348. static u8 ide_read_device(ide_drive_t *drive)
  349. {
  350. ide_task_t task;
  351. memset(&task, 0, sizeof(task));
  352. task.tf_flags = IDE_TFLAG_IN_DEVICE;
  353. drive->hwif->tp_ops->tf_read(drive, &task);
  354. return task.tf.device;
  355. }
  356. /**
  357. * do_probe - probe an IDE device
  358. * @drive: drive to probe
  359. * @cmd: command to use
  360. *
  361. * do_probe() has the difficult job of finding a drive if it exists,
  362. * without getting hung up if it doesn't exist, without trampling on
  363. * ethernet cards, and without leaving any IRQs dangling to haunt us later.
  364. *
  365. * If a drive is "known" to exist (from CMOS or kernel parameters),
  366. * but does not respond right away, the probe will "hang in there"
  367. * for the maximum wait time (about 30 seconds), otherwise it will
  368. * exit much more quickly.
  369. *
  370. * Returns: 0 device was identified
  371. * 1 device timed-out (no response to identify request)
  372. * 2 device aborted the command (refused to identify itself)
  373. * 3 bad status from device (possible for ATAPI drives)
  374. * 4 probe was not attempted because failure was obvious
  375. */
  376. static int do_probe (ide_drive_t *drive, u8 cmd)
  377. {
  378. ide_hwif_t *hwif = HWIF(drive);
  379. const struct ide_tp_ops *tp_ops = hwif->tp_ops;
  380. int rc;
  381. u8 stat;
  382. if (drive->present) {
  383. /* avoid waiting for inappropriate probes */
  384. if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
  385. return 4;
  386. }
  387. #ifdef DEBUG
  388. printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
  389. drive->name, drive->present, drive->media,
  390. (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
  391. #endif
  392. /* needed for some systems
  393. * (e.g. crw9624 as drive0 with disk as slave)
  394. */
  395. msleep(50);
  396. SELECT_DRIVE(drive);
  397. msleep(50);
  398. if (ide_read_device(drive) != drive->select.all && !drive->present) {
  399. if (drive->select.b.unit != 0) {
  400. /* exit with drive0 selected */
  401. SELECT_DRIVE(&hwif->drives[0]);
  402. /* allow BUSY_STAT to assert & clear */
  403. msleep(50);
  404. }
  405. /* no i/f present: mmm.. this should be a 4 -ml */
  406. return 3;
  407. }
  408. stat = tp_ops->read_status(hwif);
  409. if (OK_STAT(stat, READY_STAT, BUSY_STAT) ||
  410. drive->present || cmd == WIN_PIDENTIFY) {
  411. /* send cmd and wait */
  412. if ((rc = try_to_identify(drive, cmd))) {
  413. /* failed: try again */
  414. rc = try_to_identify(drive,cmd);
  415. }
  416. stat = tp_ops->read_status(hwif);
  417. if (stat == (BUSY_STAT | READY_STAT))
  418. return 4;
  419. if (rc == 1 && cmd == WIN_PIDENTIFY) {
  420. printk(KERN_ERR "%s: no response (status = 0x%02x), "
  421. "resetting drive\n", drive->name, stat);
  422. msleep(50);
  423. SELECT_DRIVE(drive);
  424. msleep(50);
  425. tp_ops->exec_command(hwif, WIN_SRST);
  426. (void)ide_busy_sleep(hwif);
  427. rc = try_to_identify(drive, cmd);
  428. }
  429. /* ensure drive IRQ is clear */
  430. stat = tp_ops->read_status(hwif);
  431. if (rc == 1)
  432. printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
  433. drive->name, stat);
  434. } else {
  435. /* not present or maybe ATAPI */
  436. rc = 3;
  437. }
  438. if (drive->select.b.unit != 0) {
  439. /* exit with drive0 selected */
  440. SELECT_DRIVE(&hwif->drives[0]);
  441. msleep(50);
  442. /* ensure drive irq is clear */
  443. (void)tp_ops->read_status(hwif);
  444. }
  445. return rc;
  446. }
  447. /*
  448. *
  449. */
  450. static void enable_nest (ide_drive_t *drive)
  451. {
  452. ide_hwif_t *hwif = HWIF(drive);
  453. const struct ide_tp_ops *tp_ops = hwif->tp_ops;
  454. u8 stat;
  455. printk(KERN_INFO "%s: enabling %s -- ",
  456. hwif->name, (char *)&drive->id[ATA_ID_PROD]);
  457. SELECT_DRIVE(drive);
  458. msleep(50);
  459. tp_ops->exec_command(hwif, EXABYTE_ENABLE_NEST);
  460. if (ide_busy_sleep(hwif)) {
  461. printk(KERN_CONT "failed (timeout)\n");
  462. return;
  463. }
  464. msleep(50);
  465. stat = tp_ops->read_status(hwif);
  466. if (!OK_STAT(stat, 0, BAD_STAT))
  467. printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
  468. else
  469. printk(KERN_CONT "success\n");
  470. /* if !(success||timed-out) */
  471. if (do_probe(drive, WIN_IDENTIFY) >= 2) {
  472. /* look for ATAPI device */
  473. (void) do_probe(drive, WIN_PIDENTIFY);
  474. }
  475. }
  476. /**
  477. * probe_for_drives - upper level drive probe
  478. * @drive: drive to probe for
  479. *
  480. * probe_for_drive() tests for existence of a given drive using do_probe()
  481. * and presents things to the user as needed.
  482. *
  483. * Returns: 0 no device was found
  484. * 1 device was found (note: drive->present might
  485. * still be 0)
  486. */
  487. static inline u8 probe_for_drive (ide_drive_t *drive)
  488. {
  489. char *m;
  490. /*
  491. * In order to keep things simple we have an id
  492. * block for all drives at all times. If the device
  493. * is pre ATA or refuses ATA/ATAPI identify we
  494. * will add faked data to this.
  495. *
  496. * Also note that 0 everywhere means "can't do X"
  497. */
  498. drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
  499. drive->id_read = 0;
  500. if(drive->id == NULL)
  501. {
  502. printk(KERN_ERR "ide: out of memory for id data.\n");
  503. return 0;
  504. }
  505. m = (char *)&drive->id[ATA_ID_PROD];
  506. strcpy(m, "UNKNOWN");
  507. /* skip probing? */
  508. if (!drive->noprobe)
  509. {
  510. /* if !(success||timed-out) */
  511. if (do_probe(drive, WIN_IDENTIFY) >= 2) {
  512. /* look for ATAPI device */
  513. (void) do_probe(drive, WIN_PIDENTIFY);
  514. }
  515. if (!drive->present)
  516. /* drive not found */
  517. return 0;
  518. if (strstr(m, "E X A B Y T E N E S T"))
  519. enable_nest(drive);
  520. /* identification failed? */
  521. if (!drive->id_read) {
  522. if (drive->media == ide_disk) {
  523. printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
  524. drive->name, drive->cyl,
  525. drive->head, drive->sect);
  526. } else if (drive->media == ide_cdrom) {
  527. printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
  528. } else {
  529. /* nuke it */
  530. printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
  531. drive->present = 0;
  532. }
  533. }
  534. /* drive was found */
  535. }
  536. if(!drive->present)
  537. return 0;
  538. /* The drive wasn't being helpful. Add generic info only */
  539. if (drive->id_read == 0) {
  540. generic_id(drive);
  541. return 1;
  542. }
  543. if (drive->media == ide_disk) {
  544. ide_disk_init_chs(drive);
  545. ide_disk_init_mult_count(drive);
  546. }
  547. return drive->present;
  548. }
  549. static void hwif_release_dev(struct device *dev)
  550. {
  551. ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
  552. complete(&hwif->gendev_rel_comp);
  553. }
  554. static int ide_register_port(ide_hwif_t *hwif)
  555. {
  556. int ret;
  557. /* register with global device tree */
  558. strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
  559. hwif->gendev.driver_data = hwif;
  560. if (hwif->gendev.parent == NULL) {
  561. if (hwif->dev)
  562. hwif->gendev.parent = hwif->dev;
  563. else
  564. /* Would like to do = &device_legacy */
  565. hwif->gendev.parent = NULL;
  566. }
  567. hwif->gendev.release = hwif_release_dev;
  568. ret = device_register(&hwif->gendev);
  569. if (ret < 0) {
  570. printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
  571. __func__, ret);
  572. goto out;
  573. }
  574. hwif->portdev = device_create_drvdata(ide_port_class, &hwif->gendev,
  575. MKDEV(0, 0), hwif, hwif->name);
  576. if (IS_ERR(hwif->portdev)) {
  577. ret = PTR_ERR(hwif->portdev);
  578. device_unregister(&hwif->gendev);
  579. }
  580. out:
  581. return ret;
  582. }
  583. /**
  584. * ide_port_wait_ready - wait for port to become ready
  585. * @hwif: IDE port
  586. *
  587. * This is needed on some PPCs and a bunch of BIOS-less embedded
  588. * platforms. Typical cases are:
  589. *
  590. * - The firmware hard reset the disk before booting the kernel,
  591. * the drive is still doing it's poweron-reset sequence, that
  592. * can take up to 30 seconds.
  593. *
  594. * - The firmware does nothing (or no firmware), the device is
  595. * still in POST state (same as above actually).
  596. *
  597. * - Some CD/DVD/Writer combo drives tend to drive the bus during
  598. * their reset sequence even when they are non-selected slave
  599. * devices, thus preventing discovery of the main HD.
  600. *
  601. * Doing this wait-for-non-busy should not harm any existing
  602. * configuration and fix some issues like the above.
  603. *
  604. * BenH.
  605. *
  606. * Returns 0 on success, error code (< 0) otherwise.
  607. */
  608. static int ide_port_wait_ready(ide_hwif_t *hwif)
  609. {
  610. int unit, rc;
  611. printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
  612. /* Let HW settle down a bit from whatever init state we
  613. * come from */
  614. mdelay(2);
  615. /* Wait for BSY bit to go away, spec timeout is 30 seconds,
  616. * I know of at least one disk who takes 31 seconds, I use 35
  617. * here to be safe
  618. */
  619. rc = ide_wait_not_busy(hwif, 35000);
  620. if (rc)
  621. return rc;
  622. /* Now make sure both master & slave are ready */
  623. for (unit = 0; unit < MAX_DRIVES; unit++) {
  624. ide_drive_t *drive = &hwif->drives[unit];
  625. /* Ignore disks that we will not probe for later. */
  626. if (!drive->noprobe || drive->present) {
  627. SELECT_DRIVE(drive);
  628. hwif->tp_ops->set_irq(hwif, 1);
  629. mdelay(2);
  630. rc = ide_wait_not_busy(hwif, 35000);
  631. if (rc)
  632. goto out;
  633. } else
  634. printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
  635. drive->name);
  636. }
  637. out:
  638. /* Exit function with master reselected (let's be sane) */
  639. if (unit)
  640. SELECT_DRIVE(&hwif->drives[0]);
  641. return rc;
  642. }
  643. /**
  644. * ide_undecoded_slave - look for bad CF adapters
  645. * @dev1: slave device
  646. *
  647. * Analyse the drives on the interface and attempt to decide if we
  648. * have the same drive viewed twice. This occurs with crap CF adapters
  649. * and PCMCIA sometimes.
  650. */
  651. void ide_undecoded_slave(ide_drive_t *dev1)
  652. {
  653. ide_drive_t *dev0 = &dev1->hwif->drives[0];
  654. if ((dev1->dn & 1) == 0 || dev0->present == 0)
  655. return;
  656. /* If the models don't match they are not the same product */
  657. if (strcmp((char *)&dev0->id[ATA_ID_PROD],
  658. (char *)&dev1->id[ATA_ID_PROD]))
  659. return;
  660. /* Serial numbers do not match */
  661. if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
  662. (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
  663. return;
  664. /* No serial number, thankfully very rare for CF */
  665. if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
  666. return;
  667. /* Appears to be an IDE flash adapter with decode bugs */
  668. printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
  669. dev1->present = 0;
  670. }
  671. EXPORT_SYMBOL_GPL(ide_undecoded_slave);
  672. static int ide_probe_port(ide_hwif_t *hwif)
  673. {
  674. unsigned long flags;
  675. unsigned int irqd;
  676. int unit, rc = -ENODEV;
  677. BUG_ON(hwif->present);
  678. if (hwif->drives[0].noprobe && hwif->drives[1].noprobe)
  679. return -EACCES;
  680. /*
  681. * We must always disable IRQ, as probe_for_drive will assert IRQ, but
  682. * we'll install our IRQ driver much later...
  683. */
  684. irqd = hwif->irq;
  685. if (irqd)
  686. disable_irq(hwif->irq);
  687. local_irq_set(flags);
  688. if (ide_port_wait_ready(hwif) == -EBUSY)
  689. printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
  690. /*
  691. * Second drive should only exist if first drive was found,
  692. * but a lot of cdrom drives are configured as single slaves.
  693. */
  694. for (unit = 0; unit < MAX_DRIVES; ++unit) {
  695. ide_drive_t *drive = &hwif->drives[unit];
  696. drive->dn = (hwif->channel ? 2 : 0) + unit;
  697. (void) probe_for_drive(drive);
  698. if (drive->present)
  699. rc = 0;
  700. }
  701. local_irq_restore(flags);
  702. /*
  703. * Use cached IRQ number. It might be (and is...) changed by probe
  704. * code above
  705. */
  706. if (irqd)
  707. enable_irq(irqd);
  708. return rc;
  709. }
  710. static void ide_port_tune_devices(ide_hwif_t *hwif)
  711. {
  712. const struct ide_port_ops *port_ops = hwif->port_ops;
  713. int unit;
  714. for (unit = 0; unit < MAX_DRIVES; unit++) {
  715. ide_drive_t *drive = &hwif->drives[unit];
  716. if (drive->present && port_ops && port_ops->quirkproc)
  717. port_ops->quirkproc(drive);
  718. }
  719. for (unit = 0; unit < MAX_DRIVES; ++unit) {
  720. ide_drive_t *drive = &hwif->drives[unit];
  721. if (drive->present) {
  722. ide_set_max_pio(drive);
  723. drive->nice1 = 1;
  724. if (hwif->dma_ops)
  725. ide_set_dma(drive);
  726. }
  727. }
  728. for (unit = 0; unit < MAX_DRIVES; ++unit) {
  729. ide_drive_t *drive = &hwif->drives[unit];
  730. if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
  731. drive->no_io_32bit = 1;
  732. else
  733. drive->no_io_32bit = drive->id[ATA_ID_DWORD_IO] ? 1 : 0;
  734. }
  735. }
  736. #if MAX_HWIFS > 1
  737. /*
  738. * save_match() is used to simplify logic in init_irq() below.
  739. *
  740. * A loophole here is that we may not know about a particular
  741. * hwif's irq until after that hwif is actually probed/initialized..
  742. * This could be a problem for the case where an hwif is on a
  743. * dual interface that requires serialization (eg. cmd640) and another
  744. * hwif using one of the same irqs is initialized beforehand.
  745. *
  746. * This routine detects and reports such situations, but does not fix them.
  747. */
  748. static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
  749. {
  750. ide_hwif_t *m = *match;
  751. if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
  752. if (!new->hwgroup)
  753. return;
  754. printk(KERN_WARNING "%s: potential IRQ problem with %s and %s\n",
  755. hwif->name, new->name, m->name);
  756. }
  757. if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
  758. *match = new;
  759. }
  760. #endif /* MAX_HWIFS > 1 */
  761. /*
  762. * init request queue
  763. */
  764. static int ide_init_queue(ide_drive_t *drive)
  765. {
  766. struct request_queue *q;
  767. ide_hwif_t *hwif = HWIF(drive);
  768. int max_sectors = 256;
  769. int max_sg_entries = PRD_ENTRIES;
  770. /*
  771. * Our default set up assumes the normal IDE case,
  772. * that is 64K segmenting, standard PRD setup
  773. * and LBA28. Some drivers then impose their own
  774. * limits and LBA48 we could raise it but as yet
  775. * do not.
  776. */
  777. q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
  778. if (!q)
  779. return 1;
  780. q->queuedata = drive;
  781. blk_queue_segment_boundary(q, 0xffff);
  782. if (hwif->rqsize < max_sectors)
  783. max_sectors = hwif->rqsize;
  784. blk_queue_max_sectors(q, max_sectors);
  785. #ifdef CONFIG_PCI
  786. /* When we have an IOMMU, we may have a problem where pci_map_sg()
  787. * creates segments that don't completely match our boundary
  788. * requirements and thus need to be broken up again. Because it
  789. * doesn't align properly either, we may actually have to break up
  790. * to more segments than what was we got in the first place, a max
  791. * worst case is twice as many.
  792. * This will be fixed once we teach pci_map_sg() about our boundary
  793. * requirements, hopefully soon. *FIXME*
  794. */
  795. if (!PCI_DMA_BUS_IS_PHYS)
  796. max_sg_entries >>= 1;
  797. #endif /* CONFIG_PCI */
  798. blk_queue_max_hw_segments(q, max_sg_entries);
  799. blk_queue_max_phys_segments(q, max_sg_entries);
  800. /* assign drive queue */
  801. drive->queue = q;
  802. /* needs drive->queue to be set */
  803. ide_toggle_bounce(drive, 1);
  804. return 0;
  805. }
  806. static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
  807. {
  808. ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
  809. spin_lock_irq(&ide_lock);
  810. if (!hwgroup->drive) {
  811. /* first drive for hwgroup. */
  812. drive->next = drive;
  813. hwgroup->drive = drive;
  814. hwgroup->hwif = HWIF(hwgroup->drive);
  815. } else {
  816. drive->next = hwgroup->drive->next;
  817. hwgroup->drive->next = drive;
  818. }
  819. spin_unlock_irq(&ide_lock);
  820. }
  821. /*
  822. * For any present drive:
  823. * - allocate the block device queue
  824. * - link drive into the hwgroup
  825. */
  826. static void ide_port_setup_devices(ide_hwif_t *hwif)
  827. {
  828. int i;
  829. mutex_lock(&ide_cfg_mtx);
  830. for (i = 0; i < MAX_DRIVES; i++) {
  831. ide_drive_t *drive = &hwif->drives[i];
  832. if (!drive->present)
  833. continue;
  834. if (ide_init_queue(drive)) {
  835. printk(KERN_ERR "ide: failed to init %s\n",
  836. drive->name);
  837. continue;
  838. }
  839. ide_add_drive_to_hwgroup(drive);
  840. }
  841. mutex_unlock(&ide_cfg_mtx);
  842. }
  843. static ide_hwif_t *ide_ports[MAX_HWIFS];
  844. void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
  845. {
  846. ide_hwgroup_t *hwgroup = hwif->hwgroup;
  847. ide_ports[hwif->index] = NULL;
  848. spin_lock_irq(&ide_lock);
  849. /*
  850. * Remove us from the hwgroup, and free
  851. * the hwgroup if we were the only member
  852. */
  853. if (hwif->next == hwif) {
  854. BUG_ON(hwgroup->hwif != hwif);
  855. kfree(hwgroup);
  856. } else {
  857. /* There is another interface in hwgroup.
  858. * Unlink us, and set hwgroup->drive and ->hwif to
  859. * something sane.
  860. */
  861. ide_hwif_t *g = hwgroup->hwif;
  862. while (g->next != hwif)
  863. g = g->next;
  864. g->next = hwif->next;
  865. if (hwgroup->hwif == hwif) {
  866. /* Chose a random hwif for hwgroup->hwif.
  867. * It's guaranteed that there are no drives
  868. * left in the hwgroup.
  869. */
  870. BUG_ON(hwgroup->drive != NULL);
  871. hwgroup->hwif = g;
  872. }
  873. BUG_ON(hwgroup->hwif == hwif);
  874. }
  875. spin_unlock_irq(&ide_lock);
  876. }
  877. /*
  878. * This routine sets up the irq for an ide interface, and creates a new
  879. * hwgroup for the irq/hwif if none was previously assigned.
  880. *
  881. * Much of the code is for correctly detecting/handling irq sharing
  882. * and irq serialization situations. This is somewhat complex because
  883. * it handles static as well as dynamic (PCMCIA) IDE interfaces.
  884. */
  885. static int init_irq (ide_hwif_t *hwif)
  886. {
  887. struct ide_io_ports *io_ports = &hwif->io_ports;
  888. unsigned int index;
  889. ide_hwgroup_t *hwgroup;
  890. ide_hwif_t *match = NULL;
  891. BUG_ON(in_interrupt());
  892. BUG_ON(irqs_disabled());
  893. BUG_ON(hwif == NULL);
  894. mutex_lock(&ide_cfg_mtx);
  895. hwif->hwgroup = NULL;
  896. #if MAX_HWIFS > 1
  897. /*
  898. * Group up with any other hwifs that share our irq(s).
  899. */
  900. for (index = 0; index < MAX_HWIFS; index++) {
  901. ide_hwif_t *h = ide_ports[index];
  902. if (h && h->hwgroup) { /* scan only initialized ports */
  903. if (hwif->irq == h->irq) {
  904. hwif->sharing_irq = h->sharing_irq = 1;
  905. if (hwif->chipset != ide_pci ||
  906. h->chipset != ide_pci) {
  907. save_match(hwif, h, &match);
  908. }
  909. }
  910. if (hwif->serialized) {
  911. if (hwif->mate && hwif->mate->irq == h->irq)
  912. save_match(hwif, h, &match);
  913. }
  914. if (h->serialized) {
  915. if (h->mate && hwif->irq == h->mate->irq)
  916. save_match(hwif, h, &match);
  917. }
  918. }
  919. }
  920. #endif /* MAX_HWIFS > 1 */
  921. /*
  922. * If we are still without a hwgroup, then form a new one
  923. */
  924. if (match) {
  925. hwgroup = match->hwgroup;
  926. hwif->hwgroup = hwgroup;
  927. /*
  928. * Link us into the hwgroup.
  929. * This must be done early, do ensure that unexpected_intr
  930. * can find the hwif and prevent irq storms.
  931. * No drives are attached to the new hwif, choose_drive
  932. * can't do anything stupid (yet).
  933. * Add ourself as the 2nd entry to the hwgroup->hwif
  934. * linked list, the first entry is the hwif that owns
  935. * hwgroup->handler - do not change that.
  936. */
  937. spin_lock_irq(&ide_lock);
  938. hwif->next = hwgroup->hwif->next;
  939. hwgroup->hwif->next = hwif;
  940. BUG_ON(hwif->next == hwif);
  941. spin_unlock_irq(&ide_lock);
  942. } else {
  943. hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
  944. hwif_to_node(hwif));
  945. if (hwgroup == NULL)
  946. goto out_up;
  947. hwif->hwgroup = hwgroup;
  948. hwgroup->hwif = hwif->next = hwif;
  949. init_timer(&hwgroup->timer);
  950. hwgroup->timer.function = &ide_timer_expiry;
  951. hwgroup->timer.data = (unsigned long) hwgroup;
  952. }
  953. ide_ports[hwif->index] = hwif;
  954. /*
  955. * Allocate the irq, if not already obtained for another hwif
  956. */
  957. if (!match || match->irq != hwif->irq) {
  958. int sa = 0;
  959. #if defined(__mc68000__)
  960. sa = IRQF_SHARED;
  961. #endif /* __mc68000__ */
  962. if (IDE_CHIPSET_IS_PCI(hwif->chipset))
  963. sa = IRQF_SHARED;
  964. if (io_ports->ctl_addr)
  965. hwif->tp_ops->set_irq(hwif, 1);
  966. if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
  967. goto out_unlink;
  968. }
  969. if (!hwif->rqsize) {
  970. if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
  971. (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
  972. hwif->rqsize = 256;
  973. else
  974. hwif->rqsize = 65536;
  975. }
  976. #if !defined(__mc68000__)
  977. printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
  978. io_ports->data_addr, io_ports->status_addr,
  979. io_ports->ctl_addr, hwif->irq);
  980. #else
  981. printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
  982. io_ports->data_addr, hwif->irq);
  983. #endif /* __mc68000__ */
  984. if (match)
  985. printk(KERN_CONT " (%sed with %s)",
  986. hwif->sharing_irq ? "shar" : "serializ", match->name);
  987. printk(KERN_CONT "\n");
  988. mutex_unlock(&ide_cfg_mtx);
  989. return 0;
  990. out_unlink:
  991. ide_remove_port_from_hwgroup(hwif);
  992. out_up:
  993. mutex_unlock(&ide_cfg_mtx);
  994. return 1;
  995. }
  996. static int ata_lock(dev_t dev, void *data)
  997. {
  998. /* FIXME: we want to pin hwif down */
  999. return 0;
  1000. }
  1001. static struct kobject *ata_probe(dev_t dev, int *part, void *data)
  1002. {
  1003. ide_hwif_t *hwif = data;
  1004. int unit = *part >> PARTN_BITS;
  1005. ide_drive_t *drive = &hwif->drives[unit];
  1006. if (!drive->present)
  1007. return NULL;
  1008. if (drive->media == ide_disk)
  1009. request_module("ide-disk");
  1010. if (drive->scsi)
  1011. request_module("ide-scsi");
  1012. if (drive->media == ide_cdrom || drive->media == ide_optical)
  1013. request_module("ide-cd");
  1014. if (drive->media == ide_tape)
  1015. request_module("ide-tape");
  1016. if (drive->media == ide_floppy)
  1017. request_module("ide-floppy");
  1018. return NULL;
  1019. }
  1020. static struct kobject *exact_match(dev_t dev, int *part, void *data)
  1021. {
  1022. struct gendisk *p = data;
  1023. *part &= (1 << PARTN_BITS) - 1;
  1024. return &disk_to_dev(p)->kobj;
  1025. }
  1026. static int exact_lock(dev_t dev, void *data)
  1027. {
  1028. struct gendisk *p = data;
  1029. if (!get_disk(p))
  1030. return -1;
  1031. return 0;
  1032. }
  1033. void ide_register_region(struct gendisk *disk)
  1034. {
  1035. blk_register_region(MKDEV(disk->major, disk->first_minor),
  1036. disk->minors, NULL, exact_match, exact_lock, disk);
  1037. }
  1038. EXPORT_SYMBOL_GPL(ide_register_region);
  1039. void ide_unregister_region(struct gendisk *disk)
  1040. {
  1041. blk_unregister_region(MKDEV(disk->major, disk->first_minor),
  1042. disk->minors);
  1043. }
  1044. EXPORT_SYMBOL_GPL(ide_unregister_region);
  1045. void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
  1046. {
  1047. ide_hwif_t *hwif = drive->hwif;
  1048. unsigned int unit = (drive->select.all >> 4) & 1;
  1049. disk->major = hwif->major;
  1050. disk->first_minor = unit << PARTN_BITS;
  1051. sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
  1052. disk->queue = drive->queue;
  1053. }
  1054. EXPORT_SYMBOL_GPL(ide_init_disk);
  1055. static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
  1056. {
  1057. ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
  1058. if (drive == drive->next) {
  1059. /* special case: last drive from hwgroup. */
  1060. BUG_ON(hwgroup->drive != drive);
  1061. hwgroup->drive = NULL;
  1062. } else {
  1063. ide_drive_t *walk;
  1064. walk = hwgroup->drive;
  1065. while (walk->next != drive)
  1066. walk = walk->next;
  1067. walk->next = drive->next;
  1068. if (hwgroup->drive == drive) {
  1069. hwgroup->drive = drive->next;
  1070. hwgroup->hwif = hwgroup->drive->hwif;
  1071. }
  1072. }
  1073. BUG_ON(hwgroup->drive == drive);
  1074. }
  1075. static void drive_release_dev (struct device *dev)
  1076. {
  1077. ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
  1078. ide_proc_unregister_device(drive);
  1079. spin_lock_irq(&ide_lock);
  1080. ide_remove_drive_from_hwgroup(drive);
  1081. kfree(drive->id);
  1082. drive->id = NULL;
  1083. drive->present = 0;
  1084. /* Messed up locking ... */
  1085. spin_unlock_irq(&ide_lock);
  1086. blk_cleanup_queue(drive->queue);
  1087. spin_lock_irq(&ide_lock);
  1088. drive->queue = NULL;
  1089. spin_unlock_irq(&ide_lock);
  1090. complete(&drive->gendev_rel_comp);
  1091. }
  1092. static int hwif_init(ide_hwif_t *hwif)
  1093. {
  1094. int old_irq;
  1095. if (!hwif->irq) {
  1096. hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
  1097. if (!hwif->irq) {
  1098. printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
  1099. return 0;
  1100. }
  1101. }
  1102. if (register_blkdev(hwif->major, hwif->name))
  1103. return 0;
  1104. if (!hwif->sg_max_nents)
  1105. hwif->sg_max_nents = PRD_ENTRIES;
  1106. hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
  1107. GFP_KERNEL);
  1108. if (!hwif->sg_table) {
  1109. printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
  1110. goto out;
  1111. }
  1112. sg_init_table(hwif->sg_table, hwif->sg_max_nents);
  1113. if (init_irq(hwif) == 0)
  1114. goto done;
  1115. old_irq = hwif->irq;
  1116. /*
  1117. * It failed to initialise. Find the default IRQ for
  1118. * this port and try that.
  1119. */
  1120. hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
  1121. if (!hwif->irq) {
  1122. printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
  1123. hwif->name, old_irq);
  1124. goto out;
  1125. }
  1126. if (init_irq(hwif)) {
  1127. printk(KERN_ERR "%s: probed IRQ %d and default IRQ %d failed\n",
  1128. hwif->name, old_irq, hwif->irq);
  1129. goto out;
  1130. }
  1131. printk(KERN_WARNING "%s: probed IRQ %d failed, using default\n",
  1132. hwif->name, hwif->irq);
  1133. done:
  1134. blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
  1135. THIS_MODULE, ata_probe, ata_lock, hwif);
  1136. return 1;
  1137. out:
  1138. unregister_blkdev(hwif->major, hwif->name);
  1139. return 0;
  1140. }
  1141. static void hwif_register_devices(ide_hwif_t *hwif)
  1142. {
  1143. unsigned int i;
  1144. for (i = 0; i < MAX_DRIVES; i++) {
  1145. ide_drive_t *drive = &hwif->drives[i];
  1146. struct device *dev = &drive->gendev;
  1147. int ret;
  1148. if (!drive->present)
  1149. continue;
  1150. ide_add_generic_settings(drive);
  1151. snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
  1152. dev->parent = &hwif->gendev;
  1153. dev->bus = &ide_bus_type;
  1154. dev->driver_data = drive;
  1155. dev->release = drive_release_dev;
  1156. ret = device_register(dev);
  1157. if (ret < 0)
  1158. printk(KERN_WARNING "IDE: %s: device_register error: "
  1159. "%d\n", __func__, ret);
  1160. }
  1161. }
  1162. static void ide_port_init_devices(ide_hwif_t *hwif)
  1163. {
  1164. const struct ide_port_ops *port_ops = hwif->port_ops;
  1165. int i;
  1166. for (i = 0; i < MAX_DRIVES; i++) {
  1167. ide_drive_t *drive = &hwif->drives[i];
  1168. if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
  1169. drive->io_32bit = 1;
  1170. if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
  1171. drive->unmask = 1;
  1172. if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
  1173. drive->no_unmask = 1;
  1174. if (port_ops && port_ops->init_dev)
  1175. port_ops->init_dev(drive);
  1176. }
  1177. }
  1178. static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
  1179. const struct ide_port_info *d)
  1180. {
  1181. hwif->channel = port;
  1182. if (d->chipset)
  1183. hwif->chipset = d->chipset;
  1184. if (d->init_iops)
  1185. d->init_iops(hwif);
  1186. if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
  1187. (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
  1188. hwif->irq = port ? 15 : 14;
  1189. /* ->host_flags may be set by ->init_iops (or even earlier...) */
  1190. hwif->host_flags |= d->host_flags;
  1191. hwif->pio_mask = d->pio_mask;
  1192. if (d->tp_ops)
  1193. hwif->tp_ops = d->tp_ops;
  1194. /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
  1195. if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
  1196. hwif->port_ops = d->port_ops;
  1197. hwif->swdma_mask = d->swdma_mask;
  1198. hwif->mwdma_mask = d->mwdma_mask;
  1199. hwif->ultra_mask = d->udma_mask;
  1200. if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
  1201. int rc;
  1202. if (d->init_dma)
  1203. rc = d->init_dma(hwif, d);
  1204. else
  1205. rc = ide_hwif_setup_dma(hwif, d);
  1206. if (rc < 0) {
  1207. printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
  1208. hwif->dma_base = 0;
  1209. hwif->swdma_mask = 0;
  1210. hwif->mwdma_mask = 0;
  1211. hwif->ultra_mask = 0;
  1212. } else if (d->dma_ops)
  1213. hwif->dma_ops = d->dma_ops;
  1214. }
  1215. if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
  1216. ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
  1217. if (hwif->mate)
  1218. hwif->mate->serialized = hwif->serialized = 1;
  1219. }
  1220. if (d->host_flags & IDE_HFLAG_RQSIZE_256)
  1221. hwif->rqsize = 256;
  1222. /* call chipset specific routine for each enabled port */
  1223. if (d->init_hwif)
  1224. d->init_hwif(hwif);
  1225. }
  1226. static void ide_port_cable_detect(ide_hwif_t *hwif)
  1227. {
  1228. const struct ide_port_ops *port_ops = hwif->port_ops;
  1229. if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
  1230. if (hwif->cbl != ATA_CBL_PATA40_SHORT)
  1231. hwif->cbl = port_ops->cable_detect(hwif);
  1232. }
  1233. }
  1234. static ssize_t store_delete_devices(struct device *portdev,
  1235. struct device_attribute *attr,
  1236. const char *buf, size_t n)
  1237. {
  1238. ide_hwif_t *hwif = dev_get_drvdata(portdev);
  1239. if (strncmp(buf, "1", n))
  1240. return -EINVAL;
  1241. ide_port_unregister_devices(hwif);
  1242. return n;
  1243. };
  1244. static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
  1245. static ssize_t store_scan(struct device *portdev,
  1246. struct device_attribute *attr,
  1247. const char *buf, size_t n)
  1248. {
  1249. ide_hwif_t *hwif = dev_get_drvdata(portdev);
  1250. if (strncmp(buf, "1", n))
  1251. return -EINVAL;
  1252. ide_port_unregister_devices(hwif);
  1253. ide_port_scan(hwif);
  1254. return n;
  1255. };
  1256. static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
  1257. static struct device_attribute *ide_port_attrs[] = {
  1258. &dev_attr_delete_devices,
  1259. &dev_attr_scan,
  1260. NULL
  1261. };
  1262. static int ide_sysfs_register_port(ide_hwif_t *hwif)
  1263. {
  1264. int i, uninitialized_var(rc);
  1265. for (i = 0; ide_port_attrs[i]; i++) {
  1266. rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
  1267. if (rc)
  1268. break;
  1269. }
  1270. return rc;
  1271. }
  1272. static unsigned int ide_indexes;
  1273. /**
  1274. * ide_find_port_slot - find free port slot
  1275. * @d: IDE port info
  1276. *
  1277. * Return the new port slot index or -ENOENT if we are out of free slots.
  1278. */
  1279. static int ide_find_port_slot(const struct ide_port_info *d)
  1280. {
  1281. int idx = -ENOENT;
  1282. u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
  1283. u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
  1284. /*
  1285. * Claim an unassigned slot.
  1286. *
  1287. * Give preference to claiming other slots before claiming ide0/ide1,
  1288. * just in case there's another interface yet-to-be-scanned
  1289. * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
  1290. *
  1291. * Unless there is a bootable card that does not use the standard
  1292. * ports 0x1f0/0x170 (the ide0/ide1 defaults).
  1293. */
  1294. mutex_lock(&ide_cfg_mtx);
  1295. if (MAX_HWIFS == 1) {
  1296. if (ide_indexes == 0 && i == 0)
  1297. idx = 1;
  1298. } else {
  1299. if (bootable) {
  1300. if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
  1301. idx = ffz(ide_indexes | i);
  1302. } else {
  1303. if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
  1304. idx = ffz(ide_indexes | 3);
  1305. else if ((ide_indexes & 3) != 3)
  1306. idx = ffz(ide_indexes);
  1307. }
  1308. }
  1309. if (idx >= 0)
  1310. ide_indexes |= (1 << idx);
  1311. mutex_unlock(&ide_cfg_mtx);
  1312. return idx;
  1313. }
  1314. static void ide_free_port_slot(int idx)
  1315. {
  1316. mutex_lock(&ide_cfg_mtx);
  1317. ide_indexes &= ~(1 << idx);
  1318. mutex_unlock(&ide_cfg_mtx);
  1319. }
  1320. struct ide_host *ide_host_alloc_all(const struct ide_port_info *d,
  1321. hw_regs_t **hws)
  1322. {
  1323. struct ide_host *host;
  1324. int i;
  1325. host = kzalloc(sizeof(*host), GFP_KERNEL);
  1326. if (host == NULL)
  1327. return NULL;
  1328. for (i = 0; i < MAX_HWIFS; i++) {
  1329. ide_hwif_t *hwif;
  1330. int idx;
  1331. if (hws[i] == NULL)
  1332. continue;
  1333. hwif = kzalloc(sizeof(*hwif), GFP_KERNEL);
  1334. if (hwif == NULL)
  1335. continue;
  1336. idx = ide_find_port_slot(d);
  1337. if (idx < 0) {
  1338. printk(KERN_ERR "%s: no free slot for interface\n",
  1339. d ? d->name : "ide");
  1340. kfree(hwif);
  1341. continue;
  1342. }
  1343. ide_init_port_data(hwif, idx);
  1344. hwif->host = host;
  1345. host->ports[i] = hwif;
  1346. host->n_ports++;
  1347. }
  1348. if (host->n_ports == 0) {
  1349. kfree(host);
  1350. return NULL;
  1351. }
  1352. if (hws[0])
  1353. host->dev[0] = hws[0]->dev;
  1354. if (d)
  1355. host->host_flags = d->host_flags;
  1356. return host;
  1357. }
  1358. EXPORT_SYMBOL_GPL(ide_host_alloc_all);
  1359. struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
  1360. {
  1361. hw_regs_t *hws_all[MAX_HWIFS];
  1362. int i;
  1363. for (i = 0; i < MAX_HWIFS; i++)
  1364. hws_all[i] = (i < 4) ? hws[i] : NULL;
  1365. return ide_host_alloc_all(d, hws_all);
  1366. }
  1367. EXPORT_SYMBOL_GPL(ide_host_alloc);
  1368. int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
  1369. hw_regs_t **hws)
  1370. {
  1371. ide_hwif_t *hwif, *mate = NULL;
  1372. int i, j = 0;
  1373. for (i = 0; i < MAX_HWIFS; i++) {
  1374. hwif = host->ports[i];
  1375. if (hwif == NULL) {
  1376. mate = NULL;
  1377. continue;
  1378. }
  1379. ide_init_port_hw(hwif, hws[i]);
  1380. ide_port_apply_params(hwif);
  1381. if (d == NULL) {
  1382. mate = NULL;
  1383. continue;
  1384. }
  1385. if ((i & 1) && mate) {
  1386. hwif->mate = mate;
  1387. mate->mate = hwif;
  1388. }
  1389. mate = (i & 1) ? NULL : hwif;
  1390. ide_init_port(hwif, i & 1, d);
  1391. ide_port_cable_detect(hwif);
  1392. ide_port_init_devices(hwif);
  1393. }
  1394. for (i = 0; i < MAX_HWIFS; i++) {
  1395. hwif = host->ports[i];
  1396. if (hwif == NULL)
  1397. continue;
  1398. if (ide_probe_port(hwif) == 0)
  1399. hwif->present = 1;
  1400. if (hwif->chipset != ide_4drives || !hwif->mate ||
  1401. !hwif->mate->present)
  1402. ide_register_port(hwif);
  1403. if (hwif->present)
  1404. ide_port_tune_devices(hwif);
  1405. }
  1406. for (i = 0; i < MAX_HWIFS; i++) {
  1407. hwif = host->ports[i];
  1408. if (hwif == NULL)
  1409. continue;
  1410. if (hwif_init(hwif) == 0) {
  1411. printk(KERN_INFO "%s: failed to initialize IDE "
  1412. "interface\n", hwif->name);
  1413. hwif->present = 0;
  1414. continue;
  1415. }
  1416. j++;
  1417. if (hwif->present)
  1418. ide_port_setup_devices(hwif);
  1419. ide_acpi_init(hwif);
  1420. if (hwif->present)
  1421. ide_acpi_port_init_devices(hwif);
  1422. }
  1423. for (i = 0; i < MAX_HWIFS; i++) {
  1424. hwif = host->ports[i];
  1425. if (hwif == NULL)
  1426. continue;
  1427. if (hwif->chipset == ide_unknown)
  1428. hwif->chipset = ide_generic;
  1429. if (hwif->present)
  1430. hwif_register_devices(hwif);
  1431. }
  1432. for (i = 0; i < MAX_HWIFS; i++) {
  1433. hwif = host->ports[i];
  1434. if (hwif == NULL)
  1435. continue;
  1436. ide_sysfs_register_port(hwif);
  1437. ide_proc_register_port(hwif);
  1438. if (hwif->present)
  1439. ide_proc_port_register_devices(hwif);
  1440. }
  1441. return j ? 0 : -1;
  1442. }
  1443. EXPORT_SYMBOL_GPL(ide_host_register);
  1444. int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
  1445. struct ide_host **hostp)
  1446. {
  1447. struct ide_host *host;
  1448. int rc;
  1449. host = ide_host_alloc(d, hws);
  1450. if (host == NULL)
  1451. return -ENOMEM;
  1452. rc = ide_host_register(host, d, hws);
  1453. if (rc) {
  1454. ide_host_free(host);
  1455. return rc;
  1456. }
  1457. if (hostp)
  1458. *hostp = host;
  1459. return 0;
  1460. }
  1461. EXPORT_SYMBOL_GPL(ide_host_add);
  1462. void ide_host_free(struct ide_host *host)
  1463. {
  1464. ide_hwif_t *hwif;
  1465. int i;
  1466. for (i = 0; i < MAX_HWIFS; i++) {
  1467. hwif = host->ports[i];
  1468. if (hwif == NULL)
  1469. continue;
  1470. ide_free_port_slot(hwif->index);
  1471. kfree(hwif);
  1472. }
  1473. kfree(host);
  1474. }
  1475. EXPORT_SYMBOL_GPL(ide_host_free);
  1476. void ide_host_remove(struct ide_host *host)
  1477. {
  1478. int i;
  1479. for (i = 0; i < MAX_HWIFS; i++) {
  1480. if (host->ports[i])
  1481. ide_unregister(host->ports[i]);
  1482. }
  1483. ide_host_free(host);
  1484. }
  1485. EXPORT_SYMBOL_GPL(ide_host_remove);
  1486. void ide_port_scan(ide_hwif_t *hwif)
  1487. {
  1488. ide_port_apply_params(hwif);
  1489. ide_port_cable_detect(hwif);
  1490. ide_port_init_devices(hwif);
  1491. if (ide_probe_port(hwif) < 0)
  1492. return;
  1493. hwif->present = 1;
  1494. ide_port_tune_devices(hwif);
  1495. ide_acpi_port_init_devices(hwif);
  1496. ide_port_setup_devices(hwif);
  1497. hwif_register_devices(hwif);
  1498. ide_proc_port_register_devices(hwif);
  1499. }
  1500. EXPORT_SYMBOL_GPL(ide_port_scan);
  1501. static void ide_legacy_init_one(hw_regs_t **hws, hw_regs_t *hw,
  1502. u8 port_no, const struct ide_port_info *d,
  1503. unsigned long config)
  1504. {
  1505. unsigned long base, ctl;
  1506. int irq;
  1507. if (port_no == 0) {
  1508. base = 0x1f0;
  1509. ctl = 0x3f6;
  1510. irq = 14;
  1511. } else {
  1512. base = 0x170;
  1513. ctl = 0x376;
  1514. irq = 15;
  1515. }
  1516. if (!request_region(base, 8, d->name)) {
  1517. printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
  1518. d->name, base, base + 7);
  1519. return;
  1520. }
  1521. if (!request_region(ctl, 1, d->name)) {
  1522. printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
  1523. d->name, ctl);
  1524. release_region(base, 8);
  1525. return;
  1526. }
  1527. ide_std_init_ports(hw, base, ctl);
  1528. hw->irq = irq;
  1529. hw->chipset = d->chipset;
  1530. hw->config = config;
  1531. hws[port_no] = hw;
  1532. }
  1533. int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
  1534. {
  1535. hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
  1536. memset(&hw, 0, sizeof(hw));
  1537. if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
  1538. ide_legacy_init_one(hws, &hw[0], 0, d, config);
  1539. ide_legacy_init_one(hws, &hw[1], 1, d, config);
  1540. if (hws[0] == NULL && hws[1] == NULL &&
  1541. (d->host_flags & IDE_HFLAG_SINGLE))
  1542. return -ENOENT;
  1543. return ide_host_add(d, hws, NULL);
  1544. }
  1545. EXPORT_SYMBOL_GPL(ide_legacy_device_add);