ide-pmac.c

at91rm9200处理器ide接口驱动程序源代码

			/* UltraDMA modes. */
			drive->using_dma = pmac_ide_udma_enable(drive, idx,
				pmac_ide[idx].kind == controller_kl_ata4_80);
		}
		if (!drive->using_dma && (id->dma_mword & 0x0007)) {
			/* Normal MultiWord DMA modes. */
			drive->using_dma = pmac_ide_mdma_enable(drive, idx);
		}
		OUT_BYTE(0, IDE_CONTROL_REG);
		/* Apply settings to controller */
		pmac_ide_selectproc(drive);
	}
	return 0;
}

static int __pmac
pmac_ide_dmaproc(ide_dma_action_t func, ide_drive_t *drive)
{
	int ix, dstat;
	volatile struct dbdma_regs *dma;
	byte unit = (drive->select.b.unit & 0x01);
	byte ata4;
	int reading = 0;

	/* 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;
	ata4 = (pmac_ide[ix].kind == controller_kl_ata4 ||
		pmac_ide[ix].kind == controller_kl_ata4_80);
	
	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:
		reading = 1;
	case ide_dma_write:
		SELECT_READ_WRITE(HWIF(drive),drive,func);
		if (!pmac_ide_build_dmatable(drive, ix, !reading))
			return 1;
		/* Apple adds 60ns to wrDataSetup on reads */
		if (ata4 && (pmac_ide[ix].timings[unit] & TR_66_UDMA_EN)) {
			out_le32((unsigned *)(IDE_DATA_REG + IDE_TIMING_CONFIG + _IO_BASE),
				pmac_ide[ix].timings[unit] + 
				(reading ? 0x00800000UL : 0));
			(void)in_le32((unsigned *)(IDE_DATA_REG + IDE_TIMING_CONFIG + _IO_BASE));
		}
		drive->waiting_for_dma = 1;
		if (drive->media != ide_disk)
			return 0;
		ide_set_handler(drive, &ide_dma_intr, WAIT_CMD, NULL);
		if ((HWGROUP(drive)->rq->cmd == IDE_DRIVE_TASKFILE) &&
		    (drive->addressing == 1)) {
			ide_task_t *args = HWGROUP(drive)->rq->special;
			OUT_BYTE(args->tfRegister[IDE_COMMAND_OFFSET], IDE_COMMAND_REG);
		} else if (drive->addressing) {
			OUT_BYTE(reading ? WIN_READDMA_EXT : WIN_WRITEDMA_EXT, IDE_COMMAND_REG);
		} else {
			OUT_BYTE(reading ? WIN_READDMA : WIN_WRITEDMA, IDE_COMMAND_REG);
		}
	case ide_dma_begin:
		out_le32(&dma->control, (RUN << 16) | RUN);
		/* Make sure it gets to the controller right now */
		(void)in_le32(&dma->control);
		break;
	case ide_dma_end: /* returns 1 on error, 0 otherwise */
		drive->waiting_for_dma = 0;
		dstat = in_le32(&dma->status);
		out_le32(&dma->control, ((RUN|WAKE|DEAD) << 16));
		pmac_ide_destroy_dmatable(drive, ix);
		/* verify good dma status */
		return (dstat & (RUN|DEAD|ACTIVE)) != RUN;
	case ide_dma_test_irq: /* returns 1 if dma irq issued, 0 otherwise */
		/* We have to things to deal with here:
		 * 
		 * - The dbdma won't stop if the command was started
		 * but completed with an error without transfering all
		 * datas. This happens when bad blocks are met during
		 * a multi-block transfer.
		 * 
		 * - The dbdma fifo hasn't yet finished flushing to
		 * to system memory when the disk interrupt occurs.
		 * 
		 * The trick here is to increment drive->waiting_for_dma,
		 * and return as if no interrupt occured. If the counter
		 * reach a certain timeout value, we then return 1. If
		 * we really got the interrupt, it will happen right away
		 * again.
		 * Apple's solution here may be more elegant. They issue
		 * a DMA channel interrupt (a separate irq line) via a DBDMA
		 * NOP command just before the STOP, and wait for both the
		 * disk and DBDMA interrupts to have completed.
		 */
		 
		/* If ACTIVE is cleared, the STOP command have passed and
		 * transfer is complete.
		 */
		if (!(in_le32(&dma->status) & ACTIVE))
			return 1;
		if (!drive->waiting_for_dma)
			printk(KERN_WARNING "ide%d, ide_dma_test_irq \
				called while not waiting\n", ix);

		/* If dbdma didn't execute the STOP command yet, the
		 * active bit is still set */
		drive->waiting_for_dma++;
		if (drive->waiting_for_dma >= DMA_WAIT_TIMEOUT) {
			printk(KERN_WARNING "ide%d, timeout waiting \
				for dbdma command stop\n", ix);
			return 1;
		}
		udelay(1);
		return 0;

		/* 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 */

static void __pmac
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(drive->select.all, base+0x60);
		(void)inb(base+0x60);
		udelay(100);
		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;
	}
}

#ifdef CONFIG_PMAC_PBOOK
static void __pmac
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;
		if (!list_empty(&drive->queue.queue_head))
			ide_do_request(HWGROUP(drive), 0);
		spin_unlock_irq(&io_request_lock);
	}
#endif /* CONFIG_BLK_DEV_IDEDMA_PMAC */
}

static void __pmac
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 the bus */
	ppc_md.feature_call(PMAC_FTR_IDE_ENABLE, np, pmac_ide[i].aapl_bus_id, 0);
}

static void __pmac
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 */
		ppc_md.feature_call(PMAC_FTR_IDE_RESET, np, pmac_ide[i].aapl_bus_id, 1);
		ppc_md.feature_call(PMAC_FTR_IDE_ENABLE, np, pmac_ide[i].aapl_bus_id, 1);
		mdelay(10);
		ppc_md.feature_call(PMAC_FTR_IDE_RESET, np, pmac_ide[i].aapl_bus_id, 0);
	}
}

static void
idepmac_sleep_drive(ide_drive_t *drive, int idx, unsigned long base)
{
	int unlock = 0;

	/* 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, idx, base);
	}
	if (unlock)
		spin_unlock_irq(&io_request_lock);
}

static void
idepmac_wake_drive(ide_drive_t *drive, unsigned long base)
{
	unsigned long flags;
	int j;
	
	/* Reset timings */
	pmac_ide_selectproc(drive);
	mdelay(10);
	
	/* Wait up to 20 seconds for the drive to be ready */
	for (j = 0; j < 200; j++) {
		int status;
		mdelay(100);
		outb(drive->select.all, base + 0x60);
		if (inb(base + 0x60) != drive->select.all)
			continue;
		status = inb(base + 0x70);
		if (!(status & BUSY_STAT))
			break;
	}

	/* We resume processing on the HW group */
	spin_lock_irqsave(&io_request_lock, flags);
	HWGROUP(drive)->busy = 0;
	if (!list_empty(&drive->queue.queue_head))
		ide_do_request(HWGROUP(drive), 0);
	spin_unlock_irqrestore(&io_request_lock, flags);			
}

/* 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 __pmac
idepmac_notify_sleep(struct pmu_sleep_notifier *self, int when)
{
	int i, ret;
	unsigned long base;
	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;
			int dn;

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

			hwif = &ide_hwifs[i];
			for (dn=0; dn<MAX_DRIVES; dn++) {
				if (!hwif->drives[dn].present)
					continue;
				idepmac_sleep_drive(&hwif->drives[dn], i, base);
			}
			/* Disable irq during sleep */
			disable_irq(pmac_ide[i].irq);
			
			/* 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;
				
			/* Make sure we have sane timings */		
			sanitize_timings(i);

			/* 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;
			int used_dma, dn;
			int irq_on = 0;
			
			if ((base = pmac_ide[i].regbase) == 0)
				continue;
				
			hwif = &ide_hwifs[i];
			for (dn=0; dn<MAX_DRIVES; dn++) {
				ide_drive_t *drive = &hwif->drives[dn];
				if (!drive->present)
					continue;
				/* We don't have re-configured DMA yet */
				used_dma = drive->using_dma;
				drive->using_dma = 0;
				idepmac_wake_drive(drive, base);
				if (!irq_on) {
					enable_irq(pmac_ide[i].irq);
					irq_on = 1;
				}
				idepmac_wake_device(drive, used_dma);
			}
			if (!irq_on)
				enable_irq(pmac_ide[i].irq);
		}
		break;
	}
	return PBOOK_SLEEP_OK;
}
#endif /* CONFIG_PMAC_PBOOK */

static int __pmac
pmac_ide_notify_reboot(struct notifier_block *this, unsigned long code, void *x)
{
	int i, gotone;
	unsigned long base;

	if (code != SYS_HALT && code != SYS_POWER_OFF)
		return 0;

	gotone = 0;
	for (i = 0; i < pmac_ide_count; ++i) {
		ide_hwif_t *hwif;
		ide_drive_t *drive;
		int unlock = 0;
		int dn;

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

		hwif = &ide_hwifs[i];
		for (dn=0; dn<MAX_DRIVES; dn++) {
			drive = &hwif->drives[dn];
			if (drive->present) {
				gotone = 1;
				/* 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);
				}
			}
			if (unlock)
				spin_unlock_irq(&io_request_lock);
		}
	}
	if (gotone)
		mdelay(1000);
		
	return NOTIFY_DONE;
}