ide-pmac.c

em85xx的大硬盘修正代码包

	}
#ifdef IDE_PMAC_DEBUG
	printk(KERN_INFO "ide_pmac: Set MDMA timing for mode %d, reg: 0x%08x\n",
		feature & 0xf, *timings);
#endif
	drive->current_speed = feature;	
	return 1;
}

/* Calculate Ultra DMA timings */
static int
pmac_ide_udma_enable(ide_drive_t *drive, int idx)
{
	byte bits = drive->id->dma_ultra & 0x1f;
	byte feature = udma_bits_to_command(bits);
	int cycleTime, accessTime;
	int rdyToPauseTicks, cycleTicks;
	u32 *timings;
	int ret;

	/* Set feature on drive */
    	printk(KERN_INFO "%s: Enabling Ultra DMA %d\n", drive->name, feature & 0xf);
	ret = pmac_ide_do_setfeature(drive, feature);
	if (ret) {
		printk(KERN_WARNING "%s: Failed !\n", drive->name);
		return 0;
	}

	if (!drive->init_speed)
		drive->init_speed = feature;

	/* which drive is it ? */
	if (drive->select.all & 0x10)
		timings = &pmac_ide[idx].timings[1];
	else
		timings = &pmac_ide[idx].timings[0];

	cycleTime = udma_timings[feature & 0xf].cycleTime;
	accessTime = udma_timings[feature & 0xf].accessTime;

	rdyToPauseTicks = SYSCLK_TICKS_UDMA(accessTime * 1000);
	cycleTicks = SYSCLK_TICKS_UDMA(cycleTime * 1000);

	*timings = ((*timings) & 0xe00fffff) |
			((cycleTicks << 1) | (rdyToPauseTicks << 5) | 1) << 20;

	drive->current_speed = feature;	
	return 1;
}

static int
pmac_ide_check_dma(ide_drive_t *drive)
{
	int ata4, udma, idx;
	struct hd_driveid *id = drive->id;
	int enable = 1;

	drive->using_dma = 0;
	
	idx = pmac_ide_find(drive);
	if (idx < 0)
		return 0;
		
	if (drive->media == ide_floppy)
		enable = 0;
	if (((id->capability & 1) == 0) && !check_drive_lists(drive, GOOD_DMA_DRIVE))
		enable = 0;
	if (check_drive_lists(drive, BAD_DMA_DRIVE))
		enable = 0;

	udma = 0;
	ata4 = (pmac_ide[idx].kind == controller_kl_ata4);
			
	if(enable) {
		if (ata4 && (drive->media == ide_disk) &&
		    (id->field_valid & 0x0004) && (id->dma_ultra & 0x17)) {
			/* UltraDMA modes. */
			drive->using_dma = pmac_ide_udma_enable(drive, idx);
		}
		if (!drive->using_dma && (id->dma_mword & 0x0007)) {
			/* Normal MultiWord DMA modes. */
			drive->using_dma = pmac_ide_mdma_enable(drive, idx);
		}
		/* Without this, strange things will happen on Keylargo-based
		 * machines
		 */
		OUT_BYTE(0, IDE_CONTROL_REG);
		/* Apply settings to controller */
		pmac_ide_selectproc(drive);
	}
	return 0;
}

int pmac_ide_dmaproc(ide_dma_action_t func, ide_drive_t *drive)
{
	int ix, dstat, i;
	volatile struct dbdma_regs *dma;

	/* Can we stuff a pointer to our intf structure in config_data
	 * or select_data in hwif ?
	 */
	ix = pmac_ide_find(drive);
	if (ix < 0)
		return 0;		
	dma = pmac_ide[ix].dma_regs;

	switch (func) {
	case ide_dma_off:
		printk(KERN_INFO "%s: DMA disabled\n", drive->name);
	case ide_dma_off_quietly:
		drive->using_dma = 0;
		break;
	case ide_dma_on:
	case ide_dma_check:
		pmac_ide_check_dma(drive);
		break;
	case ide_dma_read:
	case ide_dma_write:
		if (!pmac_ide_build_dmatable(drive, ix, func==ide_dma_write))
			return 1;
		drive->waiting_for_dma = 1;
		if (drive->media != ide_disk)
			return 0;
		ide_set_handler(drive, &ide_dma_intr, WAIT_CMD, NULL);
		OUT_BYTE(func==ide_dma_write? WIN_WRITEDMA: WIN_READDMA,
			 IDE_COMMAND_REG);
	case ide_dma_begin:
		out_le32(&dma->control, (RUN << 16) | RUN);
		break;
	case ide_dma_end:
		drive->waiting_for_dma = 0;
		dstat = in_le32(&dma->status);
		out_le32(&dma->control, ((RUN|WAKE|DEAD) << 16));
		/* verify good dma status */
		return (dstat & (RUN|DEAD|ACTIVE)) != RUN;
	case ide_dma_test_irq:
		if ((in_le32(&dma->status) & (RUN|ACTIVE)) == RUN)
			return 1;
		/* That's a bit ugly and dangerous, but works in our case
		 * to workaround a problem with the channel status staying
		 * active if the drive returns an error
		 */
		if (IDE_CONTROL_REG) {
			byte stat;
			stat = GET_ALTSTAT();
			if (stat & ERR_STAT)
				return 1;
		}
		/* In some edge cases, some datas may still be in the dbdma
		 * engine fifo, we wait a bit for dbdma to complete
		 */
		while ((in_le32(&dma->status) & (RUN|ACTIVE)) != RUN) {
			if (++i > 100)
				return 0;
			udelay(1);
		}
		return 1;

		/* Let's implement tose just in case someone wants them */
	case ide_dma_bad_drive:
	case ide_dma_good_drive:
		return check_drive_lists(drive, (func == ide_dma_good_drive));
	case ide_dma_verbose:
		return report_drive_dmaing(drive);
	case ide_dma_retune:
	case ide_dma_lostirq:
	case ide_dma_timeout:
		printk(KERN_WARNING "ide_pmac_dmaproc: chipset supported %s func only: %d\n", ide_dmafunc_verbose(func),  func);
		return 1;
	default:
		printk(KERN_WARNING "ide_pmac_dmaproc: unsupported %s func: %d\n", ide_dmafunc_verbose(func), func);
		return 1;
	}
	return 0;
}
#endif /* CONFIG_BLK_DEV_IDEDMA_PMAC */

#ifdef CONFIG_PMAC_PBOOK
static void idepmac_sleep_device(ide_drive_t *drive, int i, unsigned base)
{
	int j;
	
	/* FIXME: We only handle the master IDE disk, we shoud
	 *        try to fix CD-ROMs here
	 */
	switch (drive->media) {
	case ide_disk:
		/* Spin down the drive */
		outb(0xa0, base+0x60);
		outb(0x0, base+0x30);
		outb(0x0, base+0x20);
		outb(0x0, base+0x40);
		outb(0x0, base+0x50);
		outb(0xe0, base+0x70);
		outb(0x2, base+0x160);   
		for (j = 0; j < 10; j++) {
			int status;
			mdelay(100);
			status = inb(base+0x70);
			if (!(status & BUSY_STAT) && (status & DRQ_STAT))
				break;
		}
		break;
	case ide_cdrom:
		// todo
		break;
	case ide_floppy:
		// todo
		break;
	}
}

static void idepmac_wake_device(ide_drive_t *drive, int used_dma)
 {
	/* We force the IDE subdriver to check for a media change
	 * This must be done first or we may lost the condition
	 *
	 * Problem: This can schedule. I moved the block device
	 * wakeup almost late by priority because of that.
	 */
	if (DRIVER(drive) && DRIVER(drive)->media_change)
		DRIVER(drive)->media_change(drive);

	/* We kick the VFS too (see fix in ide.c revalidate) */
	check_disk_change(MKDEV(HWIF(drive)->major, (drive->select.b.unit) << PARTN_BITS));
	
#ifdef CONFIG_BLK_DEV_IDEDMA_PMAC
	/* We re-enable DMA on the drive if it was active. */
	/* This doesn't work with the CD-ROM in the media-bay, probably
	 * because of a pending unit attention. The problem if that if I
	 * clear the error, the filesystem dies.
	 */
	if (used_dma && !ide_spin_wait_hwgroup(drive)) {
		/* Lock HW group */
		HWGROUP(drive)->busy = 1;
		pmac_ide_check_dma(drive);
		HWGROUP(drive)->busy = 0;
		spin_unlock_irq(&io_request_lock);
	}
#endif /* CONFIG_BLK_DEV_IDEDMA_PMAC */
}

static void idepmac_sleep_interface(int i, unsigned base, int mediabay)
{
	struct device_node* np = pmac_ide[i].node;

	/* We clear the timings */
	pmac_ide[i].timings[0] = 0;
	pmac_ide[i].timings[1] = 0;
	
	/* The media bay will handle itself just fine */
	if (mediabay)
		return;
	
	/* Disable and reset the bus */
	feature_set(np, FEATURE_IDE0_reset);
	feature_clear(np, FEATURE_IDE0_enable);
	switch(pmac_ide[i].aapl_bus_id) {
	    case 0:
		feature_set(np, FEATURE_IDE0_reset);
		feature_clear(np, FEATURE_IDE0_enable);
		break;
	    case 1:
		feature_set(np, FEATURE_IDE1_reset);
		feature_clear(np, FEATURE_IDE1_enable);
		break;
	    case 2:
		feature_set(np, FEATURE_IDE2_reset);
		break;
	}
}

static void idepmac_wake_interface(int i, unsigned long base, int mediabay)
{
	struct device_node* np = pmac_ide[i].node;

	if (!mediabay) {
		/* Revive IDE disk and controller */
		switch(pmac_ide[i].aapl_bus_id) {
		    case 0:
			feature_set(np, FEATURE_IDE0_reset);
			feature_set(np, FEATURE_IOBUS_enable);
			mdelay(10);
	 		feature_set(np, FEATURE_IDE0_enable);
			mdelay(10);
			feature_clear(np, FEATURE_IDE0_reset);
			break;
		    case 1:
			feature_set(np, FEATURE_IDE1_reset);
			feature_set(np, FEATURE_IOBUS_enable);
			mdelay(10);
	 		feature_set(np, FEATURE_IDE1_enable);
			mdelay(10);
			feature_clear(np, FEATURE_IDE1_reset);
			break;
		    case 2:
		    	/* This one exists only for KL, I don't know
			   about any enable bit */
			feature_set(np, FEATURE_IDE2_reset);
			mdelay(10);
			feature_clear(np, FEATURE_IDE2_reset);
			break;
		}
	}
	
	/* Reset timings */
	pmac_ide_selectproc(&ide_hwifs[i].drives[0]);
	mdelay(10);
}

/* Note: We support only master drives for now. This will have to be
 * improved if we want to handle sleep on the iMacDV where the CD-ROM
 * is a slave
 */
static int idepmac_notify_sleep(struct pmu_sleep_notifier *self, int when)
{
	int i, ret;
	unsigned long base;
	unsigned long flags;
	int big_delay;

	switch (when) {
	case PBOOK_SLEEP_REQUEST:
		break;
	case PBOOK_SLEEP_REJECT:
		break;
	case PBOOK_SLEEP_NOW:
		for (i = 0; i < pmac_ide_count; ++i) {
			ide_hwif_t *hwif;
			ide_drive_t *drive;
			int unlock = 0;

			if ((base = pmac_ide[i].regbase) == 0)
				continue;	

			hwif = &ide_hwifs[i];
			drive = &hwif->drives[0];
			
			if (drive->present) {
				/* Wait for HW group to complete operations */
				if (ide_spin_wait_hwgroup(drive)) {
					// What can we do here ? Wake drive we had already
					// put to sleep and return an error ?
				} else {
					unlock = 1;
					/* Lock HW group */
					HWGROUP(drive)->busy = 1;

					/* Stop the device */
					idepmac_sleep_device(drive, i, base);
				
				}
			}
			/* Disable irq during sleep */
			disable_irq(pmac_ide[i].irq);
			if (unlock)
				spin_unlock_irq(&io_request_lock);
			
			/* Check if this is a media bay with an IDE device or not
			 * a media bay.
			 */
			ret = check_media_bay_by_base(base, MB_CD);
			if ((ret == 0) || (ret == -ENODEV))
				idepmac_sleep_interface(i, base, (ret == 0));
		}
		break;
	case PBOOK_WAKE:
		big_delay = 0;
		for (i = 0; i < pmac_ide_count; ++i) {

			if ((base = pmac_ide[i].regbase) == 0)
				continue;
				
			/* Check if this is a media bay with an IDE device or not
			 * a media bay
			 */
			ret = check_media_bay_by_base(base, MB_CD);
			if ((ret == 0) || (ret == -ENODEV)) {
				idepmac_wake_interface(i, base, (ret == 0));				
				big_delay = 1;
			}

		}
		/* Let hardware get up to speed */
		if (big_delay)
			mdelay(IDE_WAKEUP_DELAY_MS);
	
		for (i = 0; i < pmac_ide_count; ++i) {
			ide_hwif_t *hwif;
			ide_drive_t *drive;			
			int j, used_dma;
			
			if ((base = pmac_ide[i].regbase) == 0)
				continue;
				
			hwif = &ide_hwifs[i];
			drive = &hwif->drives[0];

			/* Wait for the drive to come up and set it's DMA */
			if (drive->present) {
				/* Wait up to 20 seconds */
				for (j = 0; j < 200; j++) {
					int status;
					mdelay(100);
					status = inb(base + 0x70);
					if (!(status & BUSY_STAT))
						break;
				}
			}
			
			/* We don't have re-configured DMA yet */
			used_dma = drive->using_dma;
			drive->using_dma = 0;

			/* We resume processing on the HW group */
			spin_lock_irqsave(&io_request_lock, flags);
			enable_irq(pmac_ide[i].irq);
			if (drive->present)
				HWGROUP(drive)->busy = 0;
			spin_unlock_irqrestore(&io_request_lock, flags);
			
			/* Wake the device
			 * We could handle the slave here
			 */
			if (drive->present)
				idepmac_wake_device(drive, used_dma);
		}
		break;
	}
	return PBOOK_SLEEP_OK;
}
#endif /* CONFIG_PMAC_PBOOK */