pata_bf54x.c

linux 内核源代码

 *
 *	Note: Original code is ata_std_softreset().
 */

static int bfin_std_softreset(struct ata_link *link, unsigned int *classes,
		unsigned long deadline)
{
	struct ata_port *ap = link->ap;
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
	unsigned int devmask = 0, err_mask;
	u8 err;

	if (ata_link_offline(link)) {
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

	/* determine if device 0/1 are present */
	if (bfin_devchk(ap, 0))
		devmask |= (1 << 0);
	if (slave_possible && bfin_devchk(ap, 1))
		devmask |= (1 << 1);

	/* select device 0 again */
	bfin_std_dev_select(ap, 0);

	/* issue bus reset */
	err_mask = bfin_bus_softreset(ap, devmask);
	if (err_mask) {
		ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n",
				err_mask);
		return -EIO;
	}

	/* determine by signature whether we have ATA or ATAPI devices */
	classes[0] = ata_dev_try_classify(&ap->link.device[0],
				devmask & (1 << 0), &err);
	if (slave_possible && err != 0x81)
		classes[1] = ata_dev_try_classify(&ap->link.device[1],
					devmask & (1 << 1), &err);

 out:
	return 0;
}

/**
 *	bfin_bmdma_status - Read IDE DMA status
 *	@ap: Port associated with this ATA transaction.
 */

static unsigned char bfin_bmdma_status(struct ata_port *ap)
{
	unsigned char host_stat = 0;
	void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
	unsigned short int_status = ATAPI_GET_INT_STATUS(base);

	if (ATAPI_GET_STATUS(base) & (MULTI_XFER_ON|ULTRA_XFER_ON)) {
		host_stat |= ATA_DMA_ACTIVE;
	}
	if (int_status & (MULTI_DONE_INT|UDMAIN_DONE_INT|UDMAOUT_DONE_INT)) {
		host_stat |= ATA_DMA_INTR;
	}
	if (int_status & (MULTI_TERM_INT|UDMAIN_TERM_INT|UDMAOUT_TERM_INT)) {
		host_stat |= ATA_DMA_ERR;
	}

	return host_stat;
}

/**
 *	bfin_data_xfer - Transfer data by PIO
 *	@adev: device for this I/O
 *	@buf: data buffer
 *	@buflen: buffer length
 *	@write_data: read/write
 *
 *	Note: Original code is ata_data_xfer().
 */

static void bfin_data_xfer(struct ata_device *adev, unsigned char *buf,
			   unsigned int buflen, int write_data)
{
	struct ata_port *ap = adev->link->ap;
	unsigned int words = buflen >> 1;
	unsigned short *buf16 = (u16 *) buf;
	void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;

	/* Transfer multiple of 2 bytes */
	if (write_data) {
		write_atapi_data(base, words, buf16);
	} else {
		read_atapi_data(base, words, buf16);
	}

	/* Transfer trailing 1 byte, if any. */
	if (unlikely(buflen & 0x01)) {
		unsigned short align_buf[1] = { 0 };
		unsigned char *trailing_buf = buf + buflen - 1;

		if (write_data) {
			memcpy(align_buf, trailing_buf, 1);
			write_atapi_data(base, 1, align_buf);
		} else {
			read_atapi_data(base, 1, align_buf);
			memcpy(trailing_buf, align_buf, 1);
		}
	}
}

/**
 *	bfin_irq_clear - Clear ATAPI interrupt.
 *	@ap: Port associated with this ATA transaction.
 *
 *	Note: Original code is ata_bmdma_irq_clear().
 */

static void bfin_irq_clear(struct ata_port *ap)
{
	void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;

	pr_debug("in atapi irq clear\n");

	ATAPI_SET_INT_STATUS(base, ATAPI_GET_INT_STATUS(base)|ATAPI_DEV_INT
		| MULTI_DONE_INT | UDMAIN_DONE_INT | UDMAOUT_DONE_INT
		| MULTI_TERM_INT | UDMAIN_TERM_INT | UDMAOUT_TERM_INT);
}

/**
 *	bfin_irq_on - Enable interrupts on a port.
 *	@ap: Port on which interrupts are enabled.
 *
 *	Note: Original code is ata_irq_on().
 */

static unsigned char bfin_irq_on(struct ata_port *ap)
{
	void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
	u8 tmp;

	pr_debug("in atapi irq on\n");
	ap->ctl &= ~ATA_NIEN;
	ap->last_ctl = ap->ctl;

	write_atapi_register(base, ATA_REG_CTRL, ap->ctl);
	tmp = ata_wait_idle(ap);

	bfin_irq_clear(ap);

	return tmp;
}

/**
 *	bfin_bmdma_freeze - Freeze DMA controller port
 *	@ap: port to freeze
 *
 *	Note: Original code is ata_bmdma_freeze().
 */

static void bfin_bmdma_freeze(struct ata_port *ap)
{
	void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;

	pr_debug("in atapi dma freeze\n");
	ap->ctl |= ATA_NIEN;
	ap->last_ctl = ap->ctl;

	write_atapi_register(base, ATA_REG_CTRL, ap->ctl);

	/* Under certain circumstances, some controllers raise IRQ on
	 * ATA_NIEN manipulation.  Also, many controllers fail to mask
	 * previously pending IRQ on ATA_NIEN assertion.  Clear it.
	 */
	ata_chk_status(ap);

	bfin_irq_clear(ap);
}

/**
 *	bfin_bmdma_thaw - Thaw DMA controller port
 *	@ap: port to thaw
 *
 *	Note: Original code is ata_bmdma_thaw().
 */

void bfin_bmdma_thaw(struct ata_port *ap)
{
	bfin_check_status(ap);
	bfin_irq_clear(ap);
	bfin_irq_on(ap);
}

/**
 *	bfin_std_postreset - standard postreset callback
 *	@ap: the target ata_port
 *	@classes: classes of attached devices
 *
 *	Note: Original code is ata_std_postreset().
 */

static void bfin_std_postreset(struct ata_link *link, unsigned int *classes)
{
	struct ata_port *ap = link->ap;
	void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;

	/* re-enable interrupts */
	bfin_irq_on(ap);

	/* is double-select really necessary? */
	if (classes[0] != ATA_DEV_NONE)
		bfin_std_dev_select(ap, 1);
	if (classes[1] != ATA_DEV_NONE)
		bfin_std_dev_select(ap, 0);

	/* bail out if no device is present */
	if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
		return;
	}

	/* set up device control */
	write_atapi_register(base, ATA_REG_CTRL, ap->ctl);
}

/**
 *	bfin_error_handler - Stock error handler for DMA controller
 *	@ap: port to handle error for
 */

static void bfin_error_handler(struct ata_port *ap)
{
	ata_bmdma_drive_eh(ap, ata_std_prereset, bfin_std_softreset, NULL,
			   bfin_std_postreset);
}

static void bfin_port_stop(struct ata_port *ap)
{
	pr_debug("in atapi port stop\n");
	if (ap->udma_mask != 0 || ap->mwdma_mask != 0) {
		free_dma(CH_ATAPI_RX);
		free_dma(CH_ATAPI_TX);
	}
}

static int bfin_port_start(struct ata_port *ap)
{
	pr_debug("in atapi port start\n");
	if (!(ap->udma_mask || ap->mwdma_mask))
		return 0;

	if (request_dma(CH_ATAPI_RX, "BFIN ATAPI RX DMA") >= 0) {
		if (request_dma(CH_ATAPI_TX,
			"BFIN ATAPI TX DMA") >= 0)
			return 0;

		free_dma(CH_ATAPI_RX);
	}

	ap->udma_mask = 0;
	ap->mwdma_mask = 0;
	dev_err(ap->dev, "Unable to request ATAPI DMA!"
		" Continue in PIO mode.\n");

	return 0;
}

static struct scsi_host_template bfin_sht = {
	.module			= THIS_MODULE,
	.name			= DRV_NAME,
	.ioctl			= ata_scsi_ioctl,
	.queuecommand		= ata_scsi_queuecmd,
	.can_queue		= ATA_DEF_QUEUE,
	.this_id		= ATA_SHT_THIS_ID,
	.sg_tablesize		= SG_NONE,
	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
	.emulated		= ATA_SHT_EMULATED,
	.use_clustering		= ATA_SHT_USE_CLUSTERING,
	.proc_name		= DRV_NAME,
	.dma_boundary		= ATA_DMA_BOUNDARY,
	.slave_configure	= ata_scsi_slave_config,
	.slave_destroy		= ata_scsi_slave_destroy,
	.bios_param		= ata_std_bios_param,
#ifdef CONFIG_PM
	.resume			= ata_scsi_device_resume,
	.suspend		= ata_scsi_device_suspend,
#endif
};

static const struct ata_port_operations bfin_pata_ops = {
	.set_piomode		= bfin_set_piomode,
	.set_dmamode		= bfin_set_dmamode,

	.tf_load		= bfin_tf_load,
	.tf_read		= bfin_tf_read,
	.exec_command		= bfin_exec_command,
	.check_status		= bfin_check_status,
	.check_altstatus	= bfin_check_altstatus,
	.dev_select		= bfin_std_dev_select,

	.bmdma_setup		= bfin_bmdma_setup,
	.bmdma_start		= bfin_bmdma_start,
	.bmdma_stop		= bfin_bmdma_stop,
	.bmdma_status		= bfin_bmdma_status,
	.data_xfer		= bfin_data_xfer,

	.qc_prep		= ata_noop_qc_prep,
	.qc_issue		= ata_qc_issue_prot,

	.freeze			= bfin_bmdma_freeze,
	.thaw			= bfin_bmdma_thaw,
	.error_handler		= bfin_error_handler,
	.post_internal_cmd	= bfin_bmdma_stop,

	.irq_handler		= ata_interrupt,
	.irq_clear		= bfin_irq_clear,
	.irq_on			= bfin_irq_on,

	.port_start		= bfin_port_start,
	.port_stop		= bfin_port_stop,
};

static struct ata_port_info bfin_port_info[] = {
	{
		.sht		= &bfin_sht,
		.flags		= ATA_FLAG_SLAVE_POSS
				| ATA_FLAG_MMIO
				| ATA_FLAG_NO_LEGACY,
		.pio_mask	= 0x1f,	/* pio0-4 */
		.mwdma_mask	= 0,
		.udma_mask	= 0,
		.port_ops	= &bfin_pata_ops,
	},
};

/**
 *	bfin_reset_controller - initialize BF54x ATAPI controller.
 */

static int bfin_reset_controller(struct ata_host *host)
{
	void __iomem *base = (void __iomem *)host->ports[0]->ioaddr.ctl_addr;
	int count;
	unsigned short status;

	/* Disable all ATAPI interrupts */
	ATAPI_SET_INT_MASK(base, 0);
	SSYNC();

	/* Assert the RESET signal 25us*/
	ATAPI_SET_CONTROL(base, ATAPI_GET_CONTROL(base) | DEV_RST);
	udelay(30);

	/* Negate the RESET signal for 2ms*/
	ATAPI_SET_CONTROL(base, ATAPI_GET_CONTROL(base) & ~DEV_RST);
	msleep(2);

	/* Wait on Busy flag to clear */
	count = 10000000;
	do {
		status = read_atapi_register(base, ATA_REG_STATUS);
	} while (count-- && (status & ATA_BUSY));

	/* Enable only ATAPI Device interrupt */
	ATAPI_SET_INT_MASK(base, 1);
	SSYNC();

	return (!count);
}

/**
 *	atapi_io_port - define atapi peripheral port pins.
 */
static unsigned short atapi_io_port[] = {
	P_ATAPI_RESET,
	P_ATAPI_DIOR,
	P_ATAPI_DIOW,
	P_ATAPI_CS0,
	P_ATAPI_CS1,
	P_ATAPI_DMACK,
	P_ATAPI_DMARQ,
	P_ATAPI_INTRQ,
	P_ATAPI_IORDY,
	0
};

/**
 *	bfin_atapi_probe	-	attach a bfin atapi interface
 *	@pdev: platform device
 *
 *	Register a bfin atapi interface.
 *
 *
 *	Platform devices are expected to contain 2 resources per port:
 *
 *		- I/O Base (IORESOURCE_IO)
 *		- IRQ	   (IORESOURCE_IRQ)
 *
 */
static int __devinit bfin_atapi_probe(struct platform_device *pdev)
{
	int board_idx = 0;
	struct resource *res;
	struct ata_host *host;
	unsigned int fsclk = get_sclk();
	int udma_mode = 5;
	const struct ata_port_info *ppi[] =
		{ &bfin_port_info[board_idx], NULL };

	/*
	 * Simple resource validation ..
	 */
	if (unlikely(pdev->num_resources != 2)) {
		dev_err(&pdev->dev, "invalid number of resources\n");
		return -EINVAL;
	}

	/*
	 * Get the register base first
	 */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res == NULL)
		return -EINVAL;

	while (bfin_port_info[board_idx].udma_mask > 0 &&
			udma_fsclk[udma_mode] > fsclk) {
		udma_mode--;
		bfin_port_info[board_idx].udma_mask >>= 1;
	}

	/*
	 * Now that that's out of the way, wire up the port..
	 */
	host = ata_host_alloc_pinfo(&pdev->dev, ppi, 1);
	if (!host)
		return -ENOMEM;

	host->ports[0]->ioaddr.ctl_addr = (void *)res->start;

	if (peripheral_request_list(atapi_io_port, "atapi-io-port")) {
		dev_err(&pdev->dev, "Requesting Peripherals faild\n");
		return -EFAULT;
	}

	if (bfin_reset_controller(host)) {
		peripheral_free_list(atapi_io_port);
		dev_err(&pdev->dev, "Fail to reset ATAPI device\n");
		return -EFAULT;
	}

	if (ata_host_activate(host, platform_get_irq(pdev, 0),
		ata_interrupt, IRQF_SHARED, &bfin_sht) != 0) {
		peripheral_free_list(atapi_io_port);
		dev_err(&pdev->dev, "Fail to attach ATAPI device\n");
		return -ENODEV;
	}

	return 0;
}

/**
 *	bfin_atapi_remove	-	unplug a bfin atapi interface
 *	@pdev: platform device
 *
 *	A bfin atapi device has been unplugged. Perform the needed
 *	cleanup. Also called on module unload for any active devices.
 */
static int __devexit bfin_atapi_remove(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct ata_host *host = dev_get_drvdata(dev);

	ata_host_detach(host);

	peripheral_free_list(atapi_io_port);

	return 0;
}

#ifdef CONFIG_PM
int bfin_atapi_suspend(struct platform_device *pdev, pm_message_t state)
{
	return 0;
}

int bfin_atapi_resume(struct platform_device *pdev)
{
	return 0;
}
#endif

static struct platform_driver bfin_atapi_driver = {
	.probe			= bfin_atapi_probe,
	.remove			= __devexit_p(bfin_atapi_remove),
	.driver = {
		.name		= DRV_NAME,
		.owner		= THIS_MODULE,
#ifdef CONFIG_PM
		.suspend	= bfin_atapi_suspend,
		.resume		= bfin_atapi_resume,
#endif
	},
};

#define ATAPI_MODE_SIZE		10
static char bfin_atapi_mode[ATAPI_MODE_SIZE];

static int __init bfin_atapi_init(void)
{
	pr_info("register bfin atapi driver\n");

	switch(bfin_atapi_mode[0]) {
	case 'p':
	case 'P':
		break;
	case 'm':
	case 'M':
		bfin_port_info[0].mwdma_mask = ATA_MWDMA2;
		break;
	default:
		bfin_port_info[0].udma_mask = ATA_UDMA5;
	};

	return platform_driver_register(&bfin_atapi_driver);
}

static void __exit bfin_atapi_exit(void)
{
	platform_driver_unregister(&bfin_atapi_driver);
}

module_init(bfin_atapi_init);
module_exit(bfin_atapi_exit);
/*
 * ATAPI mode:
 * pio/PIO
 * udma/UDMA (default)
 * mwdma/MWDMA
 */
module_param_string(bfin_atapi_mode, bfin_atapi_mode, ATAPI_MODE_SIZE, 0);

MODULE_AUTHOR("Sonic Zhang <[e-mail]>");
MODULE_DESCRIPTION("PATA driver for blackfin 54x ATAPI controller");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);