mediabay.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 857 行 · 第 1/2 页

			if ((what == media_bays[i].content_id) && media_bays[i].state == mb_up)
				return 0;
			media_bays[i].cd_index = -1;
			return -EINVAL;
		}
#endif /* CONFIG_BLK_DEV_IDE */
	return -ENODEV;
}
EXPORT_SYMBOL(check_media_bay);

int __pmac check_media_bay_by_base(unsigned long base, int what)
{
#ifdef CONFIG_BLK_DEV_IDE
	int	i;

	for (i=0; i<media_bay_count; i++)
		if (media_bays[i].mdev && base == media_bays[i].cd_base) {
			if ((what == media_bays[i].content_id) && media_bays[i].state == mb_up)
				return 0;
			media_bays[i].cd_index = -1;
			return -EINVAL;
		} 
#endif
	
	return -ENODEV;
}

int __pmac media_bay_set_ide_infos(struct device_node* which_bay, unsigned long base,
	int irq, int index)
{
#ifdef CONFIG_BLK_DEV_IDE
	int	i;

	for (i=0; i<media_bay_count; i++) {
		struct media_bay_info* bay = &media_bays[i];

		if (bay->mdev && which_bay == bay->mdev->ofdev.node) {
			int timeout = 5000;
			
			down(&bay->lock);

 			bay->cd_base	= base;
			bay->cd_irq	= irq;

			if ((MB_CD != bay->content_id) || bay->state != mb_up) {
				up(&bay->lock);
				return 0;
			}
			printk(KERN_DEBUG "Registered ide%d for media bay %d\n", index, i);
			do {
				if (MB_IDE_READY(i)) {
					bay->cd_index	= index;
					up(&bay->lock);
					return 0;
				}
				mdelay(1);
			} while(--timeout);
			printk(KERN_DEBUG "Timeount waiting IDE in bay %d\n", i);
			up(&bay->lock);
			return -ENODEV;
		}
	}
#endif /* CONFIG_BLK_DEV_IDE */
	
	return -ENODEV;
}

static void __pmac media_bay_step(int i)
{
	struct media_bay_info* bay = &media_bays[i];

	/* We don't poll when powering down */
	if (bay->state != mb_powering_down)
	    poll_media_bay(bay);

	/* If timer expired or polling IDE busy, run state machine */
	if ((bay->state != mb_ide_waiting) && (bay->timer != 0)) {
		bay->timer -= MS_TO_HZ(MB_POLL_DELAY);
		if (bay->timer > 0)
			return;
		bay->timer = 0;
	}

	switch(bay->state) {
	case mb_powering_up:
	    	if (bay->ops->setup_bus(bay, bay->last_value) < 0) {
			MBDBG("mediabay%d: device not supported (kind:%d)\n", i, bay->content_id);
	    		set_mb_power(bay, 0);
	    		break;
	    	}
	    	bay->timer = MS_TO_HZ(MB_RESET_DELAY);
	    	bay->state = mb_enabling_bay;
		MBDBG("mediabay%d: enabling (kind:%d)\n", i, bay->content_id);
		break;
	case mb_enabling_bay:
		bay->ops->un_reset(bay);
	    	bay->timer = MS_TO_HZ(MB_SETUP_DELAY);
	    	bay->state = mb_resetting;
		MBDBG("mediabay%d: waiting reset (kind:%d)\n", i, bay->content_id);
	    	break;
	    
	case mb_resetting:
		if (bay->content_id != MB_CD) {
			MBDBG("mediabay%d: bay is up (kind:%d)\n", i, bay->content_id);
			bay->state = mb_up;
			break;
	    	}
#ifdef CONFIG_BLK_DEV_IDE
		MBDBG("mediabay%d: waiting IDE reset (kind:%d)\n", i, bay->content_id);
		bay->ops->un_reset_ide(bay);
	    	bay->timer = MS_TO_HZ(MB_IDE_WAIT);
	    	bay->state = mb_ide_resetting;
#else
		printk(KERN_DEBUG "media-bay %d is ide (not compiled in kernel)\n", i);
		set_mb_power(bay, 0);
#endif /* CONFIG_BLK_DEV_IDE */
	    	break;
	    
#ifdef CONFIG_BLK_DEV_IDE
	case mb_ide_resetting:
	    	bay->timer = MS_TO_HZ(MB_IDE_TIMEOUT);
	    	bay->state = mb_ide_waiting;
		MBDBG("mediabay%d: waiting IDE ready (kind:%d)\n", i, bay->content_id);
	    	break;
	    
	case mb_ide_waiting:
		if (bay->cd_base == 0) {
			bay->timer = 0;
			bay->state = mb_up;
			MBDBG("mediabay%d: up before IDE init\n", i);
			break;
		} else if (MB_IDE_READY(i)) {
			bay->timer = 0;
			bay->state = mb_up;
			if (bay->cd_index < 0) {
				hw_regs_t hw;

				printk("mediabay %d, registering IDE...\n", i);
				pmu_suspend();
				ide_init_hwif_ports(&hw, (unsigned long) bay->cd_base, (unsigned long) 0, NULL);
				hw.irq = bay->cd_irq;
				hw.chipset = ide_pmac;
				bay->cd_index = ide_register_hw(&hw, NULL);
				pmu_resume();
			}
			if (bay->cd_index == -1) {
				/* We eventually do a retry */
				bay->cd_retry++;
				printk("IDE register error\n");
				set_mb_power(bay, 0);
			} else {
				printk(KERN_DEBUG "media-bay %d is ide%d\n", i, bay->cd_index);
				MBDBG("mediabay %d IDE ready\n", i);
			}
			break;
	    	} else if (bay->timer > 0)
			bay->timer -= MS_TO_HZ(MB_POLL_DELAY);
	    	if (bay->timer <= 0) {
			printk("\nIDE Timeout in bay %d !, IDE state is: 0x%02x\n",
			       i, readb(bay->cd_base + 0x70));
			MBDBG("mediabay%d: nIDE Timeout !\n", i);
			set_mb_power(bay, 0);
			bay->timer = 0;
	    	}
		break;
#endif /* CONFIG_BLK_DEV_IDE */

	case mb_powering_down:
	    	bay->state = mb_empty;
#ifdef CONFIG_BLK_DEV_IDE
    	        if (bay->cd_index >= 0) {
			printk(KERN_DEBUG "Unregistering mb %d ide, index:%d\n", i,
			       bay->cd_index);
			ide_unregister(bay->cd_index);
			bay->cd_index = -1;
		}
	    	if (bay->cd_retry) {
			if (bay->cd_retry > MAX_CD_RETRIES) {
				/* Should add an error sound (sort of beep in dmasound) */
				printk("\nmedia-bay %d, IDE device badly inserted or unrecognised\n", i);
			} else {
				/* Force a new power down/up sequence */
				bay->content_id = MB_NO;
			}
	    	}
#endif /* CONFIG_BLK_DEV_IDE */    
		MBDBG("mediabay%d: end of power down\n", i);
	    	break;
	}
}

/*
 * This procedure runs as a kernel thread to poll the media bay
 * once each tick and register and unregister the IDE interface
 * with the IDE driver.  It needs to be a thread because
 * ide_register can't be called from interrupt context.
 */
static int __pmac media_bay_task(void *x)
{
	int	i;

	strcpy(current->comm, "media-bay");
#ifdef MB_IGNORE_SIGNALS
	sigfillset(&current->blocked);
#endif

	for (;;) {
		for (i = 0; i < media_bay_count; ++i) {
			down(&media_bays[i].lock);
			if (!media_bays[i].sleeping)
				media_bay_step(i);
			up(&media_bays[i].lock);
		}

		current->state = TASK_INTERRUPTIBLE;
		schedule_timeout(MS_TO_HZ(MB_POLL_DELAY));
		if (signal_pending(current))
			return 0;
	}
}

static int __devinit media_bay_attach(struct macio_dev *mdev, const struct of_match *match)
{
	struct media_bay_info* bay;
	volatile u32 *regbase;
	struct device_node *ofnode;
	int i;

	ofnode = mdev->ofdev.node;

	if (macio_resource_count(mdev) < 1)
		return -ENODEV;
	if (macio_request_resources(mdev, "media-bay"))
		return -EBUSY;
	/* Media bay registers are located at the beginning of the
         * mac-io chip, we get the parent address for now (hrm...)
         */
	regbase = (volatile u32 *)ioremap(ofnode->parent->addrs[0].address, 0x100);
	if (regbase == NULL) {
		macio_release_resources(mdev);
		return -ENOMEM;
	}
	
	i = media_bay_count++;
	bay = &media_bays[i];
	bay->mdev = mdev;
	bay->base = regbase;
	bay->index = i;
	bay->ops = match->data;
	bay->sleeping = 0;
	init_MUTEX(&bay->lock);

	/* Init HW probing */
	if (bay->ops->init)
		bay->ops->init(bay);

	printk(KERN_INFO "mediabay%d: Registered %s media-bay\n", i, bay->ops->name);

	/* Force an immediate detect */
	set_mb_power(bay, 0);
	msleep(MB_POWER_DELAY);
	bay->content_id = MB_NO;
	bay->last_value = bay->ops->content(bay);
	bay->value_count = MS_TO_HZ(MB_STABLE_DELAY);
	bay->state = mb_empty;
	do {
		msleep(MB_POLL_DELAY);
		media_bay_step(i);
	} while((bay->state != mb_empty) &&
		(bay->state != mb_up));

	/* Mark us ready by filling our mdev data */
	macio_set_drvdata(mdev, bay);

	/* Startup kernel thread */
	if (i == 0)
		kernel_thread(media_bay_task, NULL, CLONE_KERNEL);

	return 0;

}

static int __pmac media_bay_suspend(struct macio_dev *mdev, u32 state)
{
	struct media_bay_info	*bay = macio_get_drvdata(mdev);

	if (state != mdev->ofdev.dev.power_state && state >= 2) {
		down(&bay->lock);
		bay->sleeping = 1;
		set_mb_power(bay, 0);
		up(&bay->lock);
		msleep(MB_POLL_DELAY);
		mdev->ofdev.dev.power_state = state;
	}
	return 0;
}

static int __pmac media_bay_resume(struct macio_dev *mdev)
{
	struct media_bay_info	*bay = macio_get_drvdata(mdev);

	if (mdev->ofdev.dev.power_state != 0) {
		mdev->ofdev.dev.power_state = 0;

	       	/* We re-enable the bay using it's previous content
	       	   only if it did not change. Note those bozo timings,
	       	   they seem to help the 3400 get it right.
	       	 */
	       	/* Force MB power to 0 */
		down(&bay->lock);
	       	set_mb_power(bay, 0);
		msleep(MB_POWER_DELAY);
	       	if (bay->ops->content(bay) != bay->content_id) {
			printk("mediabay%d: content changed during sleep...\n", bay->index);
			up(&bay->lock);
	       		return 0;
		}
	       	set_mb_power(bay, 1);
	       	bay->last_value = bay->content_id;
	       	bay->value_count = MS_TO_HZ(MB_STABLE_DELAY);
	       	bay->timer = MS_TO_HZ(MB_POWER_DELAY);
#ifdef CONFIG_BLK_DEV_IDE
	       	bay->cd_retry = 0;
#endif
	       	do {
			msleep(MB_POLL_DELAY);
	       		media_bay_step(bay->index);
	       	} while((bay->state != mb_empty) &&
	       		(bay->state != mb_up));
		bay->sleeping = 0;
		up(&bay->lock);
	}
	return 0;
}


/* Definitions of "ops" structures.
 */
static struct mb_ops ohare_mb_ops __pmacdata = {
	.name		= "Ohare",
	.content	= ohare_mb_content,
	.power		= ohare_mb_power,
	.setup_bus	= ohare_mb_setup_bus,
	.un_reset	= ohare_mb_un_reset,
	.un_reset_ide	= ohare_mb_un_reset_ide,
};

static struct mb_ops heathrow_mb_ops __pmacdata = {
	.name		= "Heathrow",
	.content	= heathrow_mb_content,
	.power		= heathrow_mb_power,
	.setup_bus	= heathrow_mb_setup_bus,
	.un_reset	= heathrow_mb_un_reset,
	.un_reset_ide	= heathrow_mb_un_reset_ide,
};

static struct mb_ops keylargo_mb_ops __pmacdata = {
	.name		= "KeyLargo",
	.init		= keylargo_mb_init,
	.content	= keylargo_mb_content,
	.power		= keylargo_mb_power,
	.setup_bus	= keylargo_mb_setup_bus,
	.un_reset	= keylargo_mb_un_reset,
	.un_reset_ide	= keylargo_mb_un_reset_ide,
};

/*
 * It seems that the bit for the media-bay interrupt in the IRQ_LEVEL
 * register is always set when there is something in the media bay.
 * This causes problems for the interrupt code if we attach an interrupt
 * handler to the media-bay interrupt, because it tends to go into
 * an infinite loop calling the media bay interrupt handler.
 * Therefore we do it all by polling the media bay once each tick.
 */

static struct of_match media_bay_match[] =
{
	{
	.name		= "media-bay",
	.type		= OF_ANY_MATCH,
	.compatible	= "keylargo-media-bay",
	.data		= &keylargo_mb_ops,
	},
	{
	.name		= "media-bay",
	.type		= OF_ANY_MATCH,
	.compatible	= "heathrow-media-bay",
	.data		= &heathrow_mb_ops,
	},
	{
	.name		= "media-bay",
	.type		= OF_ANY_MATCH,
	.compatible	= "ohare-media-bay",
	.data		= &ohare_mb_ops,
	},
	{},
};

static struct macio_driver media_bay_driver =
{
	.name		= "media-bay",
	.match_table	= media_bay_match,
	.probe		= media_bay_attach,
	.suspend	= media_bay_suspend,
	.resume		= media_bay_resume
};

static int __init media_bay_init(void)
{
	int i;

	for (i=0; i<MAX_BAYS; i++) {
		memset((char *)&media_bays[i], 0, sizeof(struct media_bay_info));
		media_bays[i].content_id	= -1;
#ifdef CONFIG_BLK_DEV_IDE
		media_bays[i].cd_index		= -1;
#endif
	}
	if (_machine != _MACH_Pmac)
		return -ENODEV;

	macio_register_driver(&media_bay_driver);	

	return 0;
}

device_initcall(media_bay_init);