drivers/ata/pata_atp867x.c - kernel/msm-4.9 - Gitiles

 /*
  * pata_atp867x.c - ARTOP 867X 64bit 4-channel UDMA133 ATA controller driver
  *
  *	(C) 2009 Google Inc. John(Jung-Ik) Lee <jilee@google.com>
  *
  * Per Atp867 data sheet rev 1.2, Acard.
  * Based in part on early ide code from
  *	2003-2004 by Eric Uhrhane, Google, Inc.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  *
  *
  * TODO:
  *   1. RAID features [comparison, XOR, striping, mirroring, etc.]
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/init.h>
 #include <linux/blkdev.h>
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <scsi/scsi_host.h>
 #include <linux/libata.h>

 #define	DRV_NAME	"pata_atp867x"
 #define	DRV_VERSION	"0.7.5"

 /*
  * IO Registers
  * Note that all runtime hot priv ports are cached in ap private_data
  */

 enum {
 	ATP867X_IO_CHANNEL_OFFSET	= 0x10,

 	/*
 	 * IO Register Bitfields
 	 */

 	ATP867X_IO_PIOSPD_ACTIVE_SHIFT	= 4,
 	ATP867X_IO_PIOSPD_RECOVER_SHIFT	= 0,

 	ATP867X_IO_DMAMODE_MSTR_SHIFT	= 0,
 	ATP867X_IO_DMAMODE_MSTR_MASK	= 0x07,
 	ATP867X_IO_DMAMODE_SLAVE_SHIFT	= 4,
 	ATP867X_IO_DMAMODE_SLAVE_MASK	= 0x70,

 	ATP867X_IO_DMAMODE_UDMA_6	= 0x07,
 	ATP867X_IO_DMAMODE_UDMA_5	= 0x06,
 	ATP867X_IO_DMAMODE_UDMA_4	= 0x05,
 	ATP867X_IO_DMAMODE_UDMA_3	= 0x04,
 	ATP867X_IO_DMAMODE_UDMA_2	= 0x03,
 	ATP867X_IO_DMAMODE_UDMA_1	= 0x02,
 	ATP867X_IO_DMAMODE_UDMA_0	= 0x01,
 	ATP867X_IO_DMAMODE_DISABLE	= 0x00,

 	ATP867X_IO_SYS_INFO_66MHZ	= 0x04,
 	ATP867X_IO_SYS_INFO_SLOW_UDMA5	= 0x02,
 	ATP867X_IO_SYS_MASK_RESERVED	= (~0xf1),

 	ATP867X_IO_PORTSPD_VAL		= 0x1143,
 	ATP867X_PREREAD_VAL		= 0x0200,

 	ATP867X_NUM_PORTS		= 4,
 	ATP867X_BAR_IOBASE		= 0,
 	ATP867X_BAR_ROMBASE		= 6,
 };

 #define ATP867X_IOBASE(ap)		((ap)->host->iomap[0])
 #define ATP867X_SYS_INFO(ap)		(0x3F + ATP867X_IOBASE(ap))

 #define ATP867X_IO_PORTBASE(ap, port)	(0x00 + ATP867X_IOBASE(ap) + \
 					(port) * ATP867X_IO_CHANNEL_OFFSET)
 #define ATP867X_IO_DMABASE(ap, port)	(0x40 + \
 					ATP867X_IO_PORTBASE((ap), (port)))

 #define ATP867X_IO_STATUS(ap, port)	(0x07 + \
 					ATP867X_IO_PORTBASE((ap), (port)))
 #define ATP867X_IO_ALTSTATUS(ap, port)	(0x0E + \
 					ATP867X_IO_PORTBASE((ap), (port)))

 /*
  * hot priv ports
  */
 #define ATP867X_IO_MSTRPIOSPD(ap, port)	(0x08 + \
 					ATP867X_IO_DMABASE((ap), (port)))
 #define ATP867X_IO_SLAVPIOSPD(ap, port)	(0x09 + \
 					ATP867X_IO_DMABASE((ap), (port)))
 #define ATP867X_IO_8BPIOSPD(ap, port)	(0x0A + \
 					ATP867X_IO_DMABASE((ap), (port)))
 #define ATP867X_IO_DMAMODE(ap, port)	(0x0B + \
 					ATP867X_IO_DMABASE((ap), (port)))

 #define ATP867X_IO_PORTSPD(ap, port)	(0x4A + \
 					ATP867X_IO_PORTBASE((ap), (port)))
 #define ATP867X_IO_PREREAD(ap, port)	(0x4C + \
 					ATP867X_IO_PORTBASE((ap), (port)))

 struct atp867x_priv {
 	void __iomem *dma_mode;
 	void __iomem *mstr_piospd;
 	void __iomem *slave_piospd;
 	void __iomem *eightb_piospd;
 	int		pci66mhz;
 };

 static void atp867x_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 {
 	struct pci_dev *pdev	= to_pci_dev(ap->host->dev);
 	struct atp867x_priv *dp = ap->private_data;
 	u8 speed = adev->dma_mode;
 	u8 b;
 	u8 mode = speed - XFER_UDMA_0 + 1;

 	/*
 	 * Doc 6.6.9: decrease the udma mode value by 1 for safer UDMA speed
 	 * on 66MHz bus
 	 *   rev-A: UDMA_1~4 (5, 6 no change)
 	 *   rev-B: all UDMA modes
 	 *   UDMA_0 stays not to disable UDMA
 	 */
 	if (dp->pci66mhz && mode > ATP867X_IO_DMAMODE_UDMA_0  &&
 	   (pdev->device == PCI_DEVICE_ID_ARTOP_ATP867B ||
 	    mode < ATP867X_IO_DMAMODE_UDMA_5))
 		mode--;

 	b = ioread8(dp->dma_mode);
 	if (adev->devno & 1) {
 		b = (b & ~ATP867X_IO_DMAMODE_SLAVE_MASK) |
 			(mode << ATP867X_IO_DMAMODE_SLAVE_SHIFT);
 	} else {
 		b = (b & ~ATP867X_IO_DMAMODE_MSTR_MASK) |
 			(mode << ATP867X_IO_DMAMODE_MSTR_SHIFT);
 	}
 	iowrite8(b, dp->dma_mode);
 }

 static int atp867x_get_active_clocks_shifted(struct ata_port *ap,
 	unsigned int clk)
 {
 	struct atp867x_priv *dp = ap->private_data;
 	unsigned char clocks = clk;

 	switch (clocks) {
 	case 0:
 		clocks = 1;
 		break;
 	case 1 ... 7:
 		break;
 	case 9 ... 12:
 		clocks = 7;
 		break;
 	default:
 		printk(KERN_WARNING "ATP867X: active %dclk is invalid. "
 			"Using default 8clk.\n", clk);
 	case 8:	/* default 8 clk */
 		clocks = 0;
 		goto active_clock_shift_done;
 	}

 	/*
 	 * Doc 6.6.9: increase the clock value by 1 for safer PIO speed
 	 * on 66MHz bus
 	 */
 	if (dp->pci66mhz && clocks < 7)
 		clocks++;

 active_clock_shift_done:
 	return clocks << ATP867X_IO_PIOSPD_ACTIVE_SHIFT;
 }

 static int atp867x_get_recover_clocks_shifted(unsigned int clk)
 {
 	unsigned char clocks = clk;

 	switch (clocks) {
 	case 0:
 		clocks = 1;
 		break;
 	case 1 ... 11:
 		break;
 	case 13: case 14:
 		--clocks;	/* by the spec */
 		break;
 	case 15:
 		break;
 	default:
 		printk(KERN_WARNING "ATP867X: recover %dclk is invalid. "
 			"Using default 12clk.\n", clk);
 	case 12:	/* default 12 clk */
 		clocks = 0;
 		break;
 	}

 	return clocks << ATP867X_IO_PIOSPD_RECOVER_SHIFT;
 }

 static void atp867x_set_piomode(struct ata_port *ap, struct ata_device *adev)
 {
 	struct ata_device *peer = ata_dev_pair(adev);
 	struct atp867x_priv *dp = ap->private_data;
 	u8 speed = adev->pio_mode;
 	struct ata_timing t, p;
 	int T, UT;
 	u8 b;

 	T = 1000000000 / 33333;
 	UT = T / 4;

 	ata_timing_compute(adev, speed, &t, T, UT);
 	if (peer && peer->pio_mode) {
 		ata_timing_compute(peer, peer->pio_mode, &p, T, UT);
 		ata_timing_merge(&p, &t, &t, ATA_TIMING_8BIT);
 	}

 	b = ioread8(dp->dma_mode);
 	if (adev->devno & 1)
 		b = (b & ~ATP867X_IO_DMAMODE_SLAVE_MASK);
 	else
 		b = (b & ~ATP867X_IO_DMAMODE_MSTR_MASK);
 	iowrite8(b, dp->dma_mode);

 	b = atp867x_get_active_clocks_shifted(ap, t.active) |
 		atp867x_get_recover_clocks_shifted(t.recover);

 	if (adev->devno & 1)
 		iowrite8(b, dp->slave_piospd);
 	else
 		iowrite8(b, dp->mstr_piospd);

 	/*
 	 * use the same value for comand timing as for PIO timimg
 	 */
 	iowrite8(b, dp->eightb_piospd);
 }

 static int atp867x_cable_override(struct pci_dev *pdev)
 {
 	if (pdev->subsystem_vendor == PCI_VENDOR_ID_ARTOP &&
 		(pdev->subsystem_device == PCI_DEVICE_ID_ARTOP_ATP867A ||
 		 pdev->subsystem_device == PCI_DEVICE_ID_ARTOP_ATP867B)) {
 		return 1;
 	}
 	return 0;
 }

 static int atp867x_cable_detect(struct ata_port *ap)
 {
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);

 	if (atp867x_cable_override(pdev))
 		return ATA_CBL_PATA40_SHORT;

 	return ATA_CBL_PATA_UNK;
 }

 static struct scsi_host_template atp867x_sht = {
 	ATA_BMDMA_SHT(DRV_NAME),
 };

 static struct ata_port_operations atp867x_ops = {
 	.inherits		= &ata_bmdma_port_ops,
 	.cable_detect		= atp867x_cable_detect,
 	.set_piomode		= atp867x_set_piomode,
 	.set_dmamode		= atp867x_set_dmamode,
 };


 #ifdef	ATP867X_DEBUG
 static void atp867x_check_res(struct pci_dev *pdev)
 {
 	int i;
 	unsigned long start, len;

 	/* Check the PCI resources for this channel are enabled */
 	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 		start = pci_resource_start(pdev, i);
 		len   = pci_resource_len(pdev, i);
 		printk(KERN_DEBUG "ATP867X: resource start:len=%lx:%lx\n",
 			start, len);
 	}
 }

 static void atp867x_check_ports(struct ata_port *ap, int port)
 {
 	struct ata_ioports *ioaddr = &ap->ioaddr;
 	struct atp867x_priv *dp = ap->private_data;

 	printk(KERN_DEBUG "ATP867X: port[%d] addresses\n"
 		"  cmd_addr	=0x%llx, 0x%llx\n"
 		"  ctl_addr	=0x%llx, 0x%llx\n"
 		"  bmdma_addr	=0x%llx, 0x%llx\n"
 		"  data_addr	=0x%llx\n"
 		"  error_addr	=0x%llx\n"
 		"  feature_addr	=0x%llx\n"
 		"  nsect_addr	=0x%llx\n"
 		"  lbal_addr	=0x%llx\n"
 		"  lbam_addr	=0x%llx\n"
 		"  lbah_addr	=0x%llx\n"
 		"  device_addr	=0x%llx\n"
 		"  status_addr	=0x%llx\n"
 		"  command_addr	=0x%llx\n"
 		"  dp->dma_mode	=0x%llx\n"
 		"  dp->mstr_piospd	=0x%llx\n"
 		"  dp->slave_piospd	=0x%llx\n"
 		"  dp->eightb_piospd	=0x%llx\n"
 		"  dp->pci66mhz		=0x%lx\n",
 		port,
 		(unsigned long long)ioaddr->cmd_addr,
 		(unsigned long long)ATP867X_IO_PORTBASE(ap, port),
 		(unsigned long long)ioaddr->ctl_addr,
 		(unsigned long long)ATP867X_IO_ALTSTATUS(ap, port),
 		(unsigned long long)ioaddr->bmdma_addr,
 		(unsigned long long)ATP867X_IO_DMABASE(ap, port),
 		(unsigned long long)ioaddr->data_addr,
 		(unsigned long long)ioaddr->error_addr,
 		(unsigned long long)ioaddr->feature_addr,
 		(unsigned long long)ioaddr->nsect_addr,
 		(unsigned long long)ioaddr->lbal_addr,
 		(unsigned long long)ioaddr->lbam_addr,
 		(unsigned long long)ioaddr->lbah_addr,
 		(unsigned long long)ioaddr->device_addr,
 		(unsigned long long)ioaddr->status_addr,
 		(unsigned long long)ioaddr->command_addr,
 		(unsigned long long)dp->dma_mode,
 		(unsigned long long)dp->mstr_piospd,
 		(unsigned long long)dp->slave_piospd,
 		(unsigned long long)dp->eightb_piospd,
 		(unsigned long)dp->pci66mhz);
 }
 #endif

 static int atp867x_set_priv(struct ata_port *ap)
 {
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	struct atp867x_priv *dp;
 	int port = ap->port_no;

 	dp = ap->private_data =
 		devm_kzalloc(&pdev->dev, sizeof(*dp), GFP_KERNEL);
 	if (dp == NULL)
 		return -ENOMEM;

 	dp->dma_mode	 = ATP867X_IO_DMAMODE(ap, port);
 	dp->mstr_piospd	 = ATP867X_IO_MSTRPIOSPD(ap, port);
 	dp->slave_piospd = ATP867X_IO_SLAVPIOSPD(ap, port);
 	dp->eightb_piospd = ATP867X_IO_8BPIOSPD(ap, port);

 	dp->pci66mhz =
 		ioread8(ATP867X_SYS_INFO(ap)) & ATP867X_IO_SYS_INFO_66MHZ;

 	return 0;
 }

 static void atp867x_fixup(struct ata_host *host)
 {
 	struct pci_dev *pdev = to_pci_dev(host->dev);
 	struct ata_port *ap = host->ports[0];
 	int i;
 	u8 v;

 	/*
 	 * Broken BIOS might not set latency high enough
 	 */
 	pci_read_config_byte(pdev, PCI_LATENCY_TIMER, &v);
 	if (v < 0x80) {
 		v = 0x80;
 		pci_write_config_byte(pdev, PCI_LATENCY_TIMER, v);
 		printk(KERN_DEBUG "ATP867X: set latency timer of device %s"
 			" to %d\n", pci_name(pdev), v);
 	}

 	/*
 	 * init 8bit io ports speed(0aaarrrr) to 43h and
 	 * init udma modes of master/slave to 0/0(11h)
 	 */
 	for (i = 0; i < ATP867X_NUM_PORTS; i++)
 		iowrite16(ATP867X_IO_PORTSPD_VAL, ATP867X_IO_PORTSPD(ap, i));

 	/*
 	 * init PreREAD counts
 	 */
 	for (i = 0; i < ATP867X_NUM_PORTS; i++)
 		iowrite16(ATP867X_PREREAD_VAL, ATP867X_IO_PREREAD(ap, i));

 	v = ioread8(ATP867X_IOBASE(ap) + 0x28);
 	v &= 0xcf;	/* Enable INTA#: bit4=0 means enable */
 	v |= 0xc0;	/* Enable PCI burst, MRM & not immediate interrupts */
 	iowrite8(v, ATP867X_IOBASE(ap) + 0x28);

 	/*
 	 * Turn off the over clocked udma5 mode, only for Rev-B
 	 */
 	v = ioread8(ATP867X_SYS_INFO(ap));
 	v &= ATP867X_IO_SYS_MASK_RESERVED;
 	if (pdev->device == PCI_DEVICE_ID_ARTOP_ATP867B)
 		v |= ATP867X_IO_SYS_INFO_SLOW_UDMA5;
 	iowrite8(v, ATP867X_SYS_INFO(ap));
 }

 static int atp867x_ata_pci_sff_init_host(struct ata_host *host)
 {
 	struct device *gdev = host->dev;
 	struct pci_dev *pdev = to_pci_dev(gdev);
 	unsigned int mask = 0;
 	int i, rc;

 	/*
 	 * do not map rombase
 	 */
 	rc = pcim_iomap_regions(pdev, 1 << ATP867X_BAR_IOBASE, DRV_NAME);
 	if (rc == -EBUSY)
 		pcim_pin_device(pdev);
 	if (rc)
 		return rc;
 	host->iomap = pcim_iomap_table(pdev);

 #ifdef	ATP867X_DEBUG
 	atp867x_check_res(pdev);

 	for (i = 0; i < PCI_ROM_RESOURCE; i++)
 		printk(KERN_DEBUG "ATP867X: iomap[%d]=0x%llx\n", i,
 			(unsigned long long)(host->iomap[i]));
 #endif

 	/*
 	 * request, iomap BARs and init port addresses accordingly
 	 */
 	for (i = 0; i < host->n_ports; i++) {
 		struct ata_port *ap = host->ports[i];
 		struct ata_ioports *ioaddr = &ap->ioaddr;

 		ioaddr->cmd_addr = ATP867X_IO_PORTBASE(ap, i);
 		ioaddr->ctl_addr = ioaddr->altstatus_addr
 				 = ATP867X_IO_ALTSTATUS(ap, i);
 		ioaddr->bmdma_addr = ATP867X_IO_DMABASE(ap, i);

 		ata_sff_std_ports(ioaddr);
 		rc = atp867x_set_priv(ap);
 		if (rc)
 			return rc;

 #ifdef	ATP867X_DEBUG
 		atp867x_check_ports(ap, i);
 #endif
 		ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx",
 			(unsigned long)ioaddr->cmd_addr,
 			(unsigned long)ioaddr->ctl_addr);
 		ata_port_desc(ap, "bmdma 0x%lx",
 			(unsigned long)ioaddr->bmdma_addr);

 		mask |= 1 << i;
 	}

 	if (!mask) {
 		dev_printk(KERN_ERR, gdev, "no available native port\n");
 		return -ENODEV;
 	}

 	atp867x_fixup(host);

 	rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
 	if (rc)
 		return rc;

 	rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
 	return rc;
 }

 static int atp867x_init_one(struct pci_dev *pdev,
 	const struct pci_device_id *id)
 {
 	static int printed_version;
 	static const struct ata_port_info info_867x = {
 		.flags		= ATA_FLAG_SLAVE_POSS,
 		.pio_mask	= ATA_PIO4,
 		.udma_mask 	= ATA_UDMA6,
 		.port_ops	= &atp867x_ops,
 	};

 	struct ata_host *host;
 	const struct ata_port_info *ppi[] = { &info_867x, NULL };
 	int rc;

 	if (!printed_version++)
 		dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");

 	rc = pcim_enable_device(pdev);
 	if (rc)
 		return rc;

 	printk(KERN_INFO "ATP867X: ATP867 ATA UDMA133 controller (rev %02X)",
 		pdev->device);

 	host = ata_host_alloc_pinfo(&pdev->dev, ppi, ATP867X_NUM_PORTS);
 	if (!host) {
 		dev_printk(KERN_ERR, &pdev->dev,
 			"failed to allocate ATA host\n");
 		rc = -ENOMEM;
 		goto err_out;
 	}

 	rc = atp867x_ata_pci_sff_init_host(host);
 	if (rc) {
 		dev_printk(KERN_ERR, &pdev->dev, "failed to init host\n");
 		goto err_out;
 	}

 	pci_set_master(pdev);

 	rc = ata_host_activate(host, pdev->irq, ata_sff_interrupt,
 				IRQF_SHARED, &atp867x_sht);
 	if (rc)
 		dev_printk(KERN_ERR, &pdev->dev, "failed to activate host\n");

 err_out:
 	return rc;
 }

 static struct pci_device_id atp867x_pci_tbl[] = {
 	{ PCI_VDEVICE(ARTOP, PCI_DEVICE_ID_ARTOP_ATP867A),	0 },
 	{ PCI_VDEVICE(ARTOP, PCI_DEVICE_ID_ARTOP_ATP867B),	0 },
 	{ },
 };

 static struct pci_driver atp867x_driver = {
 	.name 		= DRV_NAME,
 	.id_table 	= atp867x_pci_tbl,
 	.probe 		= atp867x_init_one,
 	.remove		= ata_pci_remove_one,
 };

 static int __init atp867x_init(void)
 {
 	return pci_register_driver(&atp867x_driver);
 }

 static void __exit atp867x_exit(void)
 {
 	pci_unregister_driver(&atp867x_driver);
 }

 MODULE_AUTHOR("John(Jung-Ik) Lee, Google Inc.");
 MODULE_DESCRIPTION("low level driver for Artop/Acard 867x ATA controller");
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(pci, atp867x_pci_tbl);
 MODULE_VERSION(DRV_VERSION);

 module_init(atp867x_init);
 module_exit(atp867x_exit);
	/*
	* pata_atp867x.c - ARTOP 867X 64bit 4-channel UDMA133 ATA controller driver
	*
	* (C) 2009 Google Inc. John(Jung-Ik) Lee <jilee@google.com>
	*
	* Per Atp867 data sheet rev 1.2, Acard.
	* Based in part on early ide code from
	* 2003-2004 by Eric Uhrhane, Google, Inc.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*
	*
	* TODO:
	* 1. RAID features [comparison, XOR, striping, mirroring, etc.]
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/pci.h>
	#include <linux/init.h>
	#include <linux/blkdev.h>
	#include <linux/delay.h>
	#include <linux/device.h>
	#include <scsi/scsi_host.h>
	#include <linux/libata.h>

	#define DRV_NAME "pata_atp867x"
	#define DRV_VERSION "0.7.5"

	/*
	* IO Registers
	* Note that all runtime hot priv ports are cached in ap private_data
	*/

	enum {
	ATP867X_IO_CHANNEL_OFFSET = 0x10,

	/*
	* IO Register Bitfields
	*/

	ATP867X_IO_PIOSPD_ACTIVE_SHIFT = 4,
	ATP867X_IO_PIOSPD_RECOVER_SHIFT = 0,

	ATP867X_IO_DMAMODE_MSTR_SHIFT = 0,
	ATP867X_IO_DMAMODE_MSTR_MASK = 0x07,
	ATP867X_IO_DMAMODE_SLAVE_SHIFT = 4,
	ATP867X_IO_DMAMODE_SLAVE_MASK = 0x70,

	ATP867X_IO_DMAMODE_UDMA_6 = 0x07,
	ATP867X_IO_DMAMODE_UDMA_5 = 0x06,
	ATP867X_IO_DMAMODE_UDMA_4 = 0x05,
	ATP867X_IO_DMAMODE_UDMA_3 = 0x04,
	ATP867X_IO_DMAMODE_UDMA_2 = 0x03,
	ATP867X_IO_DMAMODE_UDMA_1 = 0x02,
	ATP867X_IO_DMAMODE_UDMA_0 = 0x01,
	ATP867X_IO_DMAMODE_DISABLE = 0x00,

	ATP867X_IO_SYS_INFO_66MHZ = 0x04,
	ATP867X_IO_SYS_INFO_SLOW_UDMA5 = 0x02,
	ATP867X_IO_SYS_MASK_RESERVED = (~0xf1),

	ATP867X_IO_PORTSPD_VAL = 0x1143,
	ATP867X_PREREAD_VAL = 0x0200,

	ATP867X_NUM_PORTS = 4,
	ATP867X_BAR_IOBASE = 0,
	ATP867X_BAR_ROMBASE = 6,
	};

	#define ATP867X_IOBASE(ap) ((ap)->host->iomap[0])
	#define ATP867X_SYS_INFO(ap) (0x3F + ATP867X_IOBASE(ap))

	#define ATP867X_IO_PORTBASE(ap, port) (0x00 + ATP867X_IOBASE(ap) + \
	(port) * ATP867X_IO_CHANNEL_OFFSET)
	#define ATP867X_IO_DMABASE(ap, port) (0x40 + \
	ATP867X_IO_PORTBASE((ap), (port)))

	#define ATP867X_IO_STATUS(ap, port) (0x07 + \
	ATP867X_IO_PORTBASE((ap), (port)))
	#define ATP867X_IO_ALTSTATUS(ap, port) (0x0E + \
	ATP867X_IO_PORTBASE((ap), (port)))

	/*
	* hot priv ports
	*/
	#define ATP867X_IO_MSTRPIOSPD(ap, port) (0x08 + \
	ATP867X_IO_DMABASE((ap), (port)))
	#define ATP867X_IO_SLAVPIOSPD(ap, port) (0x09 + \
	ATP867X_IO_DMABASE((ap), (port)))
	#define ATP867X_IO_8BPIOSPD(ap, port) (0x0A + \
	ATP867X_IO_DMABASE((ap), (port)))
	#define ATP867X_IO_DMAMODE(ap, port) (0x0B + \
	ATP867X_IO_DMABASE((ap), (port)))

	#define ATP867X_IO_PORTSPD(ap, port) (0x4A + \
	ATP867X_IO_PORTBASE((ap), (port)))
	#define ATP867X_IO_PREREAD(ap, port) (0x4C + \
	ATP867X_IO_PORTBASE((ap), (port)))

	struct atp867x_priv {
	void __iomem *dma_mode;
	void __iomem *mstr_piospd;
	void __iomem *slave_piospd;
	void __iomem *eightb_piospd;
	int pci66mhz;
	};

	static void atp867x_set_dmamode(struct ata_port ap, struct ata_device adev)
	{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	struct atp867x_priv *dp = ap->private_data;
	u8 speed = adev->dma_mode;
	u8 b;
	u8 mode = speed - XFER_UDMA_0 + 1;

	/*
	* Doc 6.6.9: decrease the udma mode value by 1 for safer UDMA speed
	* on 66MHz bus
	* rev-A: UDMA_1~4 (5, 6 no change)
	* rev-B: all UDMA modes
	* UDMA_0 stays not to disable UDMA
	*/
	if (dp->pci66mhz && mode > ATP867X_IO_DMAMODE_UDMA_0 &&
	(pdev->device == PCI_DEVICE_ID_ARTOP_ATP867B \|\|
	mode < ATP867X_IO_DMAMODE_UDMA_5))
	mode--;

	b = ioread8(dp->dma_mode);
	if (adev->devno & 1) {
	b = (b & ~ATP867X_IO_DMAMODE_SLAVE_MASK) \|
	(mode << ATP867X_IO_DMAMODE_SLAVE_SHIFT);
	} else {
	b = (b & ~ATP867X_IO_DMAMODE_MSTR_MASK) \|
	(mode << ATP867X_IO_DMAMODE_MSTR_SHIFT);
	}
	iowrite8(b, dp->dma_mode);
	}

	static int atp867x_get_active_clocks_shifted(struct ata_port *ap,
	unsigned int clk)
	{
	struct atp867x_priv *dp = ap->private_data;
	unsigned char clocks = clk;

	switch (clocks) {
	case 0:
	clocks = 1;
	break;
	case 1 ... 7:
	break;
	case 9 ... 12:
	clocks = 7;
	break;
	default:
	printk(KERN_WARNING "ATP867X: active %dclk is invalid. "
	"Using default 8clk.\n", clk);
	case 8: /* default 8 clk */
	clocks = 0;
	goto active_clock_shift_done;
	}

	/*
	* Doc 6.6.9: increase the clock value by 1 for safer PIO speed
	* on 66MHz bus
	*/
	if (dp->pci66mhz && clocks < 7)
	clocks++;

	active_clock_shift_done:
	return clocks << ATP867X_IO_PIOSPD_ACTIVE_SHIFT;
	}

	static int atp867x_get_recover_clocks_shifted(unsigned int clk)
	{
	unsigned char clocks = clk;

	switch (clocks) {
	case 0:
	clocks = 1;
	break;
	case 1 ... 11:
	break;
	case 13: case 14:
	--clocks; /* by the spec */
	break;
	case 15:
	break;
	default:
	printk(KERN_WARNING "ATP867X: recover %dclk is invalid. "
	"Using default 12clk.\n", clk);
	case 12: /* default 12 clk */
	clocks = 0;
	break;
	}

	return clocks << ATP867X_IO_PIOSPD_RECOVER_SHIFT;
	}

	static void atp867x_set_piomode(struct ata_port ap, struct ata_device adev)
	{
	struct ata_device *peer = ata_dev_pair(adev);
	struct atp867x_priv *dp = ap->private_data;
	u8 speed = adev->pio_mode;
	struct ata_timing t, p;
	int T, UT;
	u8 b;

	T = 1000000000 / 33333;
	UT = T / 4;

	ata_timing_compute(adev, speed, &t, T, UT);
	if (peer && peer->pio_mode) {
	ata_timing_compute(peer, peer->pio_mode, &p, T, UT);
	ata_timing_merge(&p, &t, &t, ATA_TIMING_8BIT);
	}

	b = ioread8(dp->dma_mode);
	if (adev->devno & 1)
	b = (b & ~ATP867X_IO_DMAMODE_SLAVE_MASK);
	else
	b = (b & ~ATP867X_IO_DMAMODE_MSTR_MASK);
	iowrite8(b, dp->dma_mode);

	b = atp867x_get_active_clocks_shifted(ap, t.active) \|
	atp867x_get_recover_clocks_shifted(t.recover);

	if (adev->devno & 1)
	iowrite8(b, dp->slave_piospd);
	else
	iowrite8(b, dp->mstr_piospd);

	/*
	* use the same value for comand timing as for PIO timimg
	*/
	iowrite8(b, dp->eightb_piospd);
	}

	static int atp867x_cable_override(struct pci_dev *pdev)
	{
	if (pdev->subsystem_vendor == PCI_VENDOR_ID_ARTOP &&
	(pdev->subsystem_device == PCI_DEVICE_ID_ARTOP_ATP867A \|\|
	pdev->subsystem_device == PCI_DEVICE_ID_ARTOP_ATP867B)) {
	return 1;
	}
	return 0;
	}

	static int atp867x_cable_detect(struct ata_port *ap)
	{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);

	if (atp867x_cable_override(pdev))
	return ATA_CBL_PATA40_SHORT;

	return ATA_CBL_PATA_UNK;
	}

	static struct scsi_host_template atp867x_sht = {
	ATA_BMDMA_SHT(DRV_NAME),
	};

	static struct ata_port_operations atp867x_ops = {
	.inherits = &ata_bmdma_port_ops,
	.cable_detect = atp867x_cable_detect,
	.set_piomode = atp867x_set_piomode,
	.set_dmamode = atp867x_set_dmamode,
	};


	#ifdef ATP867X_DEBUG
	static void atp867x_check_res(struct pci_dev *pdev)
	{
	int i;
	unsigned long start, len;

	/* Check the PCI resources for this channel are enabled */
	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
	start = pci_resource_start(pdev, i);
	len = pci_resource_len(pdev, i);
	printk(KERN_DEBUG "ATP867X: resource start:len=%lx:%lx\n",
	start, len);
	}
	}

	static void atp867x_check_ports(struct ata_port *ap, int port)
	{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	struct atp867x_priv *dp = ap->private_data;

	printk(KERN_DEBUG "ATP867X: port[%d] addresses\n"
	" cmd_addr =0x%llx, 0x%llx\n"
	" ctl_addr =0x%llx, 0x%llx\n"
	" bmdma_addr =0x%llx, 0x%llx\n"
	" data_addr =0x%llx\n"
	" error_addr =0x%llx\n"
	" feature_addr =0x%llx\n"
	" nsect_addr =0x%llx\n"
	" lbal_addr =0x%llx\n"
	" lbam_addr =0x%llx\n"
	" lbah_addr =0x%llx\n"
	" device_addr =0x%llx\n"
	" status_addr =0x%llx\n"
	" command_addr =0x%llx\n"
	" dp->dma_mode =0x%llx\n"
	" dp->mstr_piospd =0x%llx\n"
	" dp->slave_piospd =0x%llx\n"
	" dp->eightb_piospd =0x%llx\n"
	" dp->pci66mhz =0x%lx\n",
	port,
	(unsigned long long)ioaddr->cmd_addr,
	(unsigned long long)ATP867X_IO_PORTBASE(ap, port),
	(unsigned long long)ioaddr->ctl_addr,
	(unsigned long long)ATP867X_IO_ALTSTATUS(ap, port),
	(unsigned long long)ioaddr->bmdma_addr,
	(unsigned long long)ATP867X_IO_DMABASE(ap, port),
	(unsigned long long)ioaddr->data_addr,
	(unsigned long long)ioaddr->error_addr,
	(unsigned long long)ioaddr->feature_addr,
	(unsigned long long)ioaddr->nsect_addr,
	(unsigned long long)ioaddr->lbal_addr,
	(unsigned long long)ioaddr->lbam_addr,
	(unsigned long long)ioaddr->lbah_addr,
	(unsigned long long)ioaddr->device_addr,
	(unsigned long long)ioaddr->status_addr,
	(unsigned long long)ioaddr->command_addr,
	(unsigned long long)dp->dma_mode,
	(unsigned long long)dp->mstr_piospd,
	(unsigned long long)dp->slave_piospd,
	(unsigned long long)dp->eightb_piospd,
	(unsigned long)dp->pci66mhz);
	}
	#endif

	static int atp867x_set_priv(struct ata_port *ap)
	{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	struct atp867x_priv *dp;
	int port = ap->port_no;

	dp = ap->private_data =
	devm_kzalloc(&pdev->dev, sizeof(*dp), GFP_KERNEL);
	if (dp == NULL)
	return -ENOMEM;

	dp->dma_mode = ATP867X_IO_DMAMODE(ap, port);
	dp->mstr_piospd = ATP867X_IO_MSTRPIOSPD(ap, port);
	dp->slave_piospd = ATP867X_IO_SLAVPIOSPD(ap, port);
	dp->eightb_piospd = ATP867X_IO_8BPIOSPD(ap, port);

	dp->pci66mhz =
	ioread8(ATP867X_SYS_INFO(ap)) & ATP867X_IO_SYS_INFO_66MHZ;

	return 0;
	}

	static void atp867x_fixup(struct ata_host *host)
	{
	struct pci_dev *pdev = to_pci_dev(host->dev);
	struct ata_port *ap = host->ports[0];
	int i;
	u8 v;

	/*
	* Broken BIOS might not set latency high enough
	*/
	pci_read_config_byte(pdev, PCI_LATENCY_TIMER, &v);
	if (v < 0x80) {
	v = 0x80;
	pci_write_config_byte(pdev, PCI_LATENCY_TIMER, v);
	printk(KERN_DEBUG "ATP867X: set latency timer of device %s"
	" to %d\n", pci_name(pdev), v);
	}

	/*
	* init 8bit io ports speed(0aaarrrr) to 43h and
	* init udma modes of master/slave to 0/0(11h)
	*/
	for (i = 0; i < ATP867X_NUM_PORTS; i++)
	iowrite16(ATP867X_IO_PORTSPD_VAL, ATP867X_IO_PORTSPD(ap, i));

	/*
	* init PreREAD counts
	*/
	for (i = 0; i < ATP867X_NUM_PORTS; i++)
	iowrite16(ATP867X_PREREAD_VAL, ATP867X_IO_PREREAD(ap, i));

	v = ioread8(ATP867X_IOBASE(ap) + 0x28);
	v &= 0xcf; /* Enable INTA#: bit4=0 means enable */
	v \|= 0xc0; /* Enable PCI burst, MRM & not immediate interrupts */
	iowrite8(v, ATP867X_IOBASE(ap) + 0x28);

	/*
	* Turn off the over clocked udma5 mode, only for Rev-B
	*/
	v = ioread8(ATP867X_SYS_INFO(ap));
	v &= ATP867X_IO_SYS_MASK_RESERVED;
	if (pdev->device == PCI_DEVICE_ID_ARTOP_ATP867B)
	v \|= ATP867X_IO_SYS_INFO_SLOW_UDMA5;
	iowrite8(v, ATP867X_SYS_INFO(ap));
	}

	static int atp867x_ata_pci_sff_init_host(struct ata_host *host)
	{
	struct device *gdev = host->dev;
	struct pci_dev *pdev = to_pci_dev(gdev);
	unsigned int mask = 0;
	int i, rc;

	/*
	* do not map rombase
	*/
	rc = pcim_iomap_regions(pdev, 1 << ATP867X_BAR_IOBASE, DRV_NAME);
	if (rc == -EBUSY)
	pcim_pin_device(pdev);
	if (rc)
	return rc;
	host->iomap = pcim_iomap_table(pdev);

	#ifdef ATP867X_DEBUG
	atp867x_check_res(pdev);

	for (i = 0; i < PCI_ROM_RESOURCE; i++)
	printk(KERN_DEBUG "ATP867X: iomap[%d]=0x%llx\n", i,
	(unsigned long long)(host->iomap[i]));
	#endif

	/*
	* request, iomap BARs and init port addresses accordingly
	*/
	for (i = 0; i < host->n_ports; i++) {
	struct ata_port *ap = host->ports[i];
	struct ata_ioports *ioaddr = &ap->ioaddr;

	ioaddr->cmd_addr = ATP867X_IO_PORTBASE(ap, i);
	ioaddr->ctl_addr = ioaddr->altstatus_addr
	= ATP867X_IO_ALTSTATUS(ap, i);
	ioaddr->bmdma_addr = ATP867X_IO_DMABASE(ap, i);

	ata_sff_std_ports(ioaddr);
	rc = atp867x_set_priv(ap);
	if (rc)
	return rc;

	#ifdef ATP867X_DEBUG
	atp867x_check_ports(ap, i);
	#endif
	ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx",
	(unsigned long)ioaddr->cmd_addr,
	(unsigned long)ioaddr->ctl_addr);
	ata_port_desc(ap, "bmdma 0x%lx",
	(unsigned long)ioaddr->bmdma_addr);

	mask \|= 1 << i;
	}

	if (!mask) {
	dev_printk(KERN_ERR, gdev, "no available native port\n");
	return -ENODEV;
	}

	atp867x_fixup(host);

	rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
	if (rc)
	return rc;

	rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
	return rc;
	}

	static int atp867x_init_one(struct pci_dev *pdev,
	const struct pci_device_id *id)
	{
	static int printed_version;
	static const struct ata_port_info info_867x = {
	.flags = ATA_FLAG_SLAVE_POSS,
	.pio_mask = ATA_PIO4,
	.udma_mask = ATA_UDMA6,
	.port_ops = &atp867x_ops,
	};

	struct ata_host *host;
	const struct ata_port_info *ppi[] = { &info_867x, NULL };
	int rc;

	if (!printed_version++)
	dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");

	rc = pcim_enable_device(pdev);
	if (rc)
	return rc;

	printk(KERN_INFO "ATP867X: ATP867 ATA UDMA133 controller (rev %02X)",
	pdev->device);

	host = ata_host_alloc_pinfo(&pdev->dev, ppi, ATP867X_NUM_PORTS);
	if (!host) {
	dev_printk(KERN_ERR, &pdev->dev,
	"failed to allocate ATA host\n");
	rc = -ENOMEM;
	goto err_out;
	}

	rc = atp867x_ata_pci_sff_init_host(host);
	if (rc) {
	dev_printk(KERN_ERR, &pdev->dev, "failed to init host\n");
	goto err_out;
	}

	pci_set_master(pdev);

	rc = ata_host_activate(host, pdev->irq, ata_sff_interrupt,
	IRQF_SHARED, &atp867x_sht);
	if (rc)
	dev_printk(KERN_ERR, &pdev->dev, "failed to activate host\n");

	err_out:
	return rc;
	}

	static struct pci_device_id atp867x_pci_tbl[] = {
	{ PCI_VDEVICE(ARTOP, PCI_DEVICE_ID_ARTOP_ATP867A), 0 },
	{ PCI_VDEVICE(ARTOP, PCI_DEVICE_ID_ARTOP_ATP867B), 0 },
	{ },
	};

	static struct pci_driver atp867x_driver = {
	.name = DRV_NAME,
	.id_table = atp867x_pci_tbl,
	.probe = atp867x_init_one,
	.remove = ata_pci_remove_one,
	};

	static int __init atp867x_init(void)
	{
	return pci_register_driver(&atp867x_driver);
	}

	static void __exit atp867x_exit(void)
	{
	pci_unregister_driver(&atp867x_driver);
	}

	MODULE_AUTHOR("John(Jung-Ik) Lee, Google Inc.");
	MODULE_DESCRIPTION("low level driver for Artop/Acard 867x ATA controller");
	MODULE_LICENSE("GPL");
	MODULE_DEVICE_TABLE(pci, atp867x_pci_tbl);
	MODULE_VERSION(DRV_VERSION);

	module_init(atp867x_init);
	module_exit(atp867x_exit);