libata: add new driver pdc_adma for PDC ADMA ATA cards

3 files changed, 749 insertions, 3 deletions

diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index be96cb78e3b5..e2845b442776 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -489,11 +489,11 @@ config SCSI_SATA_NV
 
 	  If unsure, say N.
 
-config SCSI_SATA_PROMISE
-	tristate "Promise SATA TX2/TX4 support"
+config SCSI_PDC_ADMA
+	tristate "Pacific Digital ADMA support"
 	depends on SCSI_SATA && PCI
 	help
-	  This option enables support for Promise Serial ATA TX2/TX4.
+	  This option enables support for Pacific Digital ADMA controllers
 
 	  If unsure, say N.
 
@@ -505,6 +505,14 @@ config SCSI_SATA_QSTOR
 
 	  If unsure, say N.
 
+config SCSI_SATA_PROMISE
+	tristate "Promise SATA TX2/TX4 support"
+	depends on SCSI_SATA && PCI
+	help
+	  This option enables support for Promise Serial ATA TX2/TX4.
+
+	  If unsure, say N.
+
 config SCSI_SATA_SX4
 	tristate "Promise SATA SX4 support"
 	depends on SCSI_SATA && PCI && EXPERIMENTAL
diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index e2e3d8671930..2d4439826c08 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -138,6 +138,7 @@ obj-$(CONFIG_SCSI_SATA_SX4)	+= libata.o sata_sx4.o
 obj-$(CONFIG_SCSI_SATA_NV)	+= libata.o sata_nv.o
 obj-$(CONFIG_SCSI_SATA_ULI)	+= libata.o sata_uli.o
 obj-$(CONFIG_SCSI_SATA_MV)	+= libata.o sata_mv.o
+obj-$(CONFIG_SCSI_PDC_ADMA)	+= libata.o pdc_adma.o
 
 obj-$(CONFIG_ARM)		+= arm/
 
diff --git a/drivers/scsi/pdc_adma.c b/drivers/scsi/pdc_adma.c
new file mode 100644
index 000000000000..ce006a5b4533
--- /dev/null
+++ b/drivers/scsi/pdc_adma.c
@@ -0,0 +1,737 @@
+/*
+ *  pdc_adma.c - Pacific Digital Corporation ADMA
+ *
+ *  Maintained by:  Mark Lord <mlord@pobox.com>
+ *
+ *  Copyright 2005 Mark Lord
+ *
+ *  The contents of this file are subject to the Open
+ *  Software License version 1.1 that can be found at
+ *  http://www.opensource.org/licenses/osl-1.1.txt and is included herein
+ *  by reference.
+ *
+ *  Alternatively, the contents of this file may be used under the terms
+ *  of the GNU General Public License version 2 (the "GPL") as distributed
+ *  in the kernel source COPYING file, in which case the provisions of
+ *  the GPL are applicable instead of the above.  If you wish to allow
+ *  the use of your version of this file only under the terms of the
+ *  GPL and not to allow others to use your version of this file under
+ *  the OSL, indicate your decision by deleting the provisions above and
+ *  replace them with the notice and other provisions required by the GPL.
+ *  If you do not delete the provisions above, a recipient may use your
+ *  version of this file under either the OSL or the GPL.
+ *
+ *  Supports ATA disks in single-packet ADMA mode.
+ *  Uses PIO for everything else.
+ *
+ *  TODO:  Use ADMA transfers for ATAPI devices, when possible.
+ *  This requires careful attention to a number of quirks of the chip.
+ *
+ */
+
+#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/interrupt.h>
+#include <linux/sched.h>
+#include "scsi.h"
+#include <scsi/scsi_host.h>
+#include <asm/io.h>
+#include <linux/libata.h>
+
+#define DRV_NAME	"pdc_adma"
+#define DRV_VERSION	"0.01"
+
+/* macro to calculate base address for ATA regs */
+#define ADMA_ATA_REGS(base,port_no)	((base) + ((port_no) * 0x40))
+
+/* macro to calculate base address for ADMA regs */
+#define ADMA_REGS(base,port_no)	((base) + 0x80 + ((port_no) * 0x20))
+
+enum {
+	ADMA_PORTS		= 2,
+	ADMA_CPB_BYTES		= 40,
+	ADMA_PRD_BYTES		= LIBATA_MAX_PRD * 16,
+	ADMA_PKT_BYTES		= ADMA_CPB_BYTES + ADMA_PRD_BYTES,
+
+	ADMA_DMA_BOUNDARY	= 0xffffffff,
+
+	/* global register offsets */
+	ADMA_MODE_LOCK		= 0x00c7,
+
+	/* per-channel register offsets */
+	ADMA_CONTROL		= 0x0000, /* ADMA control */
+	ADMA_STATUS		= 0x0002, /* ADMA status */
+	ADMA_CPB_COUNT		= 0x0004, /* CPB count */
+	ADMA_CPB_CURRENT	= 0x000c, /* current CPB address */
+	ADMA_CPB_NEXT		= 0x000c, /* next CPB address */
+	ADMA_CPB_LOOKUP		= 0x0010, /* CPB lookup table */
+	ADMA_FIFO_IN		= 0x0014, /* input FIFO threshold */
+	ADMA_FIFO_OUT		= 0x0016, /* output FIFO threshold */
+
+	/* ADMA_CONTROL register bits */
+	aNIEN			= (1 << 8), /* irq mask: 1==masked */
+	aGO			= (1 << 7), /* packet trigger ("Go!") */
+	aRSTADM			= (1 << 5), /* ADMA logic reset */
+	aAUTEN			= (1 << 3), /* packet trigger ("Go!") */
+	aRSTA			= (1 << 2), /* ATA hard reset */
+	aPIOMD4			= 0x0003,   /* PIO mode 4 */
+
+	/* ADMA_STATUS register bits */
+	aPSD			= (1 << 6),
+	aUIRQ			= (1 << 4),
+	aPERR			= (1 << 0),
+
+	/* CPB bits */
+	cDONE			= (1 << 0),
+	cVLD			= (1 << 0),
+	cDAT			= (1 << 2),
+	cIEN			= (1 << 3),
+
+	/* PRD bits */
+	pORD			= (1 << 4),
+	pDIRO			= (1 << 5),
+	pEND			= (1 << 7),
+
+	/* ATA register flags */
+	rIGN			= (1 << 5),
+	rEND			= (1 << 7),
+
+	/* ATA register addresses */
+	ADMA_REGS_CONTROL	= 0x0e,
+	ADMA_REGS_SECTOR_COUNT	= 0x12,
+	ADMA_REGS_LBA_LOW	= 0x13,
+	ADMA_REGS_LBA_MID	= 0x14,
+	ADMA_REGS_LBA_HIGH	= 0x15,
+	ADMA_REGS_DEVICE	= 0x16,
+	ADMA_REGS_COMMAND	= 0x17,
+
+	/* PCI device IDs */
+	board_1841_idx		= 0,	/* ADMA 2-port controller */
+};
+
+typedef enum { adma_state_idle, adma_state_pkt, adma_state_mmio } adma_state_t;
+
+struct adma_port_priv {
+	u8			*pkt;
+	dma_addr_t		pkt_dma;
+	adma_state_t		state;
+};
+
+static int adma_ata_init_one (struct pci_dev *pdev,
+				const struct pci_device_id *ent);
+static irqreturn_t adma_intr (int irq, void *dev_instance,
+				struct pt_regs *regs);
+static int adma_port_start(struct ata_port *ap);
+static void adma_host_stop(struct ata_host_set *host_set);
+static void adma_port_stop(struct ata_port *ap);
+static void adma_phy_reset(struct ata_port *ap);
+static void adma_qc_prep(struct ata_queued_cmd *qc);
+static int adma_qc_issue(struct ata_queued_cmd *qc);
+static int adma_check_atapi_dma(struct ata_queued_cmd *qc);
+static void adma_bmdma_stop(struct ata_queued_cmd *qc);
+static u8 adma_bmdma_status(struct ata_port *ap);
+static void adma_irq_clear(struct ata_port *ap);
+static void adma_eng_timeout(struct ata_port *ap);
+
+static Scsi_Host_Template adma_ata_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
+	.queuecommand		= ata_scsi_queuecmd,
+	.eh_strategy_handler	= ata_scsi_error,
+	.can_queue		= ATA_DEF_QUEUE,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= LIBATA_MAX_PRD,
+	.max_sectors		= ATA_MAX_SECTORS,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.emulated		= ATA_SHT_EMULATED,
+	.use_clustering		= ENABLE_CLUSTERING,
+	.proc_name		= DRV_NAME,
+	.dma_boundary		= ADMA_DMA_BOUNDARY,
+	.slave_configure	= ata_scsi_slave_config,
+	.bios_param		= ata_std_bios_param,
+};
+
+static struct ata_port_operations adma_ata_ops = {
+	.port_disable		= ata_port_disable,
+	.tf_load		= ata_tf_load,
+	.tf_read		= ata_tf_read,
+	.check_status		= ata_check_status,
+	.check_atapi_dma	= adma_check_atapi_dma,
+	.exec_command		= ata_exec_command,
+	.dev_select		= ata_std_dev_select,
+	.phy_reset		= adma_phy_reset,
+	.qc_prep		= adma_qc_prep,
+	.qc_issue		= adma_qc_issue,
+	.eng_timeout		= adma_eng_timeout,
+	.irq_handler		= adma_intr,
+	.irq_clear		= adma_irq_clear,
+	.port_start		= adma_port_start,
+	.port_stop		= adma_port_stop,
+	.host_stop		= adma_host_stop,
+	.bmdma_stop		= adma_bmdma_stop,
+	.bmdma_status		= adma_bmdma_status,
+};
+
+static struct ata_port_info adma_port_info[] = {
+	/* board_1841_idx */
+	{
+		.sht		= &adma_ata_sht,
+		.host_flags	= ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST |
+				  ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO,
+		.pio_mask	= 0x10, /* pio4 */
+		.udma_mask	= 0x1f, /* udma0-4 */
+		.port_ops	= &adma_ata_ops,
+	},
+};
+
+static struct pci_device_id adma_ata_pci_tbl[] = {
+	{ PCI_VENDOR_ID_PDC, 0x1841, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_1841_idx },
+
+	{ }	/* terminate list */
+};
+
+static struct pci_driver adma_ata_pci_driver = {
+	.name			= DRV_NAME,
+	.id_table		= adma_ata_pci_tbl,
+	.probe			= adma_ata_init_one,
+	.remove			= ata_pci_remove_one,
+};
+
+static int adma_check_atapi_dma(struct ata_queued_cmd *qc)
+{
+	return 1;	/* ATAPI DMA not yet supported */
+}
+
+static void adma_bmdma_stop(struct ata_queued_cmd *qc)
+{
+	/* nothing */
+}
+
+static u8 adma_bmdma_status(struct ata_port *ap)
+{
+	return 0;
+}
+
+static void adma_irq_clear(struct ata_port *ap)
+{
+	/* nothing */
+}
+
+static void adma_reset_engine(void __iomem *chan)
+{
+	/* reset ADMA to idle state */
+	writew(aPIOMD4 | aNIEN | aRSTADM, chan + ADMA_CONTROL);
+	udelay(2);
+	writew(aPIOMD4, chan + ADMA_CONTROL);
+	udelay(2);
+}
+
+static void adma_reinit_engine(struct ata_port *ap)
+{
+	struct adma_port_priv *pp = ap->private_data;
+	void __iomem *mmio_base = ap->host_set->mmio_base;
+	void __iomem *chan = ADMA_REGS(mmio_base, ap->port_no);
+
+	/* mask/clear ATA interrupts */
+	writeb(ATA_NIEN, (void __iomem *)ap->ioaddr.ctl_addr);
+	ata_check_status(ap);
+
+	/* reset the ADMA engine */
+	adma_reset_engine(chan);
+
+	/* set in-FIFO threshold to 0x100 */
+	writew(0x100, chan + ADMA_FIFO_IN);
+
+	/* set CPB pointer */
+	writel((u32)pp->pkt_dma, chan + ADMA_CPB_NEXT);
+
+	/* set out-FIFO threshold to 0x100 */
+	writew(0x100, chan + ADMA_FIFO_OUT);
+
+	/* set CPB count */
+	writew(1, chan + ADMA_CPB_COUNT);
+
+	/* read/discard ADMA status */
+	readb(chan + ADMA_STATUS);
+}
+
+static inline void adma_enter_reg_mode(struct ata_port *ap)
+{
+	void __iomem *chan = ADMA_REGS(ap->host_set->mmio_base, ap->port_no);
+
+	writew(aPIOMD4, chan + ADMA_CONTROL);
+	readb(chan + ADMA_STATUS);	/* flush */
+}
+
+static void adma_phy_reset(struct ata_port *ap)
+{
+	struct adma_port_priv *pp = ap->private_data;
+
+	pp->state = adma_state_idle;
+	adma_reinit_engine(ap);
+	ata_port_probe(ap);
+	ata_bus_reset(ap);
+}
+
+static void adma_eng_timeout(struct ata_port *ap)
+{
+	struct adma_port_priv *pp = ap->private_data;
+
+	if (pp->state != adma_state_idle) /* healthy paranoia */
+		pp->state = adma_state_mmio;
+	adma_reinit_engine(ap);
+	ata_eng_timeout(ap);
+}
+
+static int adma_fill_sg(struct ata_queued_cmd *qc)
+{
+	struct scatterlist *sg = qc->sg;
+	struct ata_port *ap = qc->ap;
+	struct adma_port_priv *pp = ap->private_data;
+	u8  *buf = pp->pkt;
+	int nelem, i = (2 + buf[3]) * 8;
+	u8 pFLAGS = pORD | ((qc->tf.flags & ATA_TFLAG_WRITE) ? pDIRO : 0);
+
+	for (nelem = 0; nelem < qc->n_elem; nelem++,sg++) {
+		u32 addr;
+		u32 len;
+
+		addr = (u32)sg_dma_address(sg);
+		*(__le32 *)(buf + i) = cpu_to_le32(addr);
+		i += 4;
+
+		len = sg_dma_len(sg) >> 3;
+		*(__le32 *)(buf + i) = cpu_to_le32(len);
+		i += 4;
+
+		if ((nelem + 1) == qc->n_elem)
+			pFLAGS |= pEND;
+		buf[i++] = pFLAGS;
+		buf[i++] = qc->dev->dma_mode & 0xf;
+		buf[i++] = 0;	/* pPKLW */
+		buf[i++] = 0;	/* reserved */
+
+		*(__le32 *)(buf + i)
+			= (pFLAGS & pEND) ? 0 : cpu_to_le32(pp->pkt_dma + i + 4);
+		i += 4;
+
+		VPRINTK("PRD[%u] = (0x%lX, 0x%X)\n", nelem,
+					(unsigned long)addr, len);
+	}
+	return i;
+}
+
+static void adma_qc_prep(struct ata_queued_cmd *qc)
+{
+	struct adma_port_priv *pp = qc->ap->private_data;
+	u8  *buf = pp->pkt;
+	u32 pkt_dma = (u32)pp->pkt_dma;
+	int i = 0;
+
+	VPRINTK("ENTER\n");
+
+	adma_enter_reg_mode(qc->ap);
+	if (qc->tf.protocol != ATA_PROT_DMA) {
+		ata_qc_prep(qc);
+		return;
+	}
+
+	buf[i++] = 0;	/* Response flags */
+	buf[i++] = 0;	/* reserved */
+	buf[i++] = cVLD | cDAT | cIEN;
+	i++;		/* cLEN, gets filled in below */
+
+	*(__le32 *)(buf+i) = cpu_to_le32(pkt_dma);	/* cNCPB */
+	i += 4;		/* cNCPB */
+	i += 4;		/* cPRD, gets filled in below */
+
+	buf[i++] = 0;	/* reserved */
+	buf[i++] = 0;	/* reserved */
+	buf[i++] = 0;	/* reserved */
+	buf[i++] = 0;	/* reserved */
+
+	/* ATA registers; must be a multiple of 4 */
+	buf[i++] = qc->tf.device;
+	buf[i++] = ADMA_REGS_DEVICE;
+	if ((qc->tf.flags & ATA_TFLAG_LBA48)) {
+		buf[i++] = qc->tf.hob_nsect;
+		buf[i++] = ADMA_REGS_SECTOR_COUNT;
+		buf[i++] = qc->tf.hob_lbal;
+		buf[i++] = ADMA_REGS_LBA_LOW;
+		buf[i++] = qc->tf.hob_lbam;
+		buf[i++] = ADMA_REGS_LBA_MID;
+		buf[i++] = qc->tf.hob_lbah;
+		buf[i++] = ADMA_REGS_LBA_HIGH;
+	}
+	buf[i++] = qc->tf.nsect;
+	buf[i++] = ADMA_REGS_SECTOR_COUNT;
+	buf[i++] = qc->tf.lbal;
+	buf[i++] = ADMA_REGS_LBA_LOW;
+	buf[i++] = qc->tf.lbam;
+	buf[i++] = ADMA_REGS_LBA_MID;
+	buf[i++] = qc->tf.lbah;
+	buf[i++] = ADMA_REGS_LBA_HIGH;
+	buf[i++] = 0;
+	buf[i++] = ADMA_REGS_CONTROL;
+	buf[i++] = rIGN;
+	buf[i++] = 0;
+	buf[i++] = qc->tf.command;
+	buf[i++] = ADMA_REGS_COMMAND | rEND;
+
+	buf[3] = (i >> 3) - 2;				/* cLEN */
+	*(__le32 *)(buf+8) = cpu_to_le32(pkt_dma + i);	/* cPRD */
+
+	i = adma_fill_sg(qc);
+	wmb();	/* flush PRDs and pkt to memory */
+#if 0
+	/* dump out CPB + PRDs for debug */
+	{
+		int j, len = 0;
+		static char obuf[2048];
+		for (j = 0; j < i; ++j) {
+			len += sprintf(obuf+len, "%02x ", buf[j]);
+			if ((j & 7) == 7) {
+				printk("%s\n", obuf);
+				len = 0;
+			}
+		}
+		if (len)
+			printk("%s\n", obuf);
+	}
+#endif
+}
+
+static inline void adma_packet_start(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	void __iomem *chan = ADMA_REGS(ap->host_set->mmio_base, ap->port_no);
+
+	VPRINTK("ENTER, ap %p\n", ap);
+
+	/* fire up the ADMA engine */
+	writew(aPIOMD4 | aGO | aAUTEN, chan + ADMA_CONTROL);
+}
+
+static int adma_qc_issue(struct ata_queued_cmd *qc)
+{
+	struct adma_port_priv *pp = qc->ap->private_data;
+
+	switch (qc->tf.protocol) {
+	case ATA_PROT_DMA:
+		pp->state = adma_state_pkt;
+		adma_packet_start(qc);
+		return 0;
+
+	case ATA_PROT_ATAPI_DMA:
+		BUG();
+		break;
+
+	default:
+		break;
+	}
+
+	pp->state = adma_state_mmio;
+	return ata_qc_issue_prot(qc);
+}
+
+static inline unsigned int adma_intr_pkt(struct ata_host_set *host_set)
+{
+	unsigned int handled = 0, port_no;
+	u8 __iomem *mmio_base = host_set->mmio_base;
+
+	for (port_no = 0; port_no < host_set->n_ports; ++port_no) {
+		struct ata_port *ap = host_set->ports[port_no];
+		struct adma_port_priv *pp;
+		struct ata_queued_cmd *qc;
+		void __iomem *chan = ADMA_REGS(mmio_base, port_no);
+		u8 drv_stat, status = readb(chan + ADMA_STATUS);
+
+		if (status == 0)
+			continue;
+		handled = 1;
+		adma_enter_reg_mode(ap);
+		if ((ap->flags & ATA_FLAG_PORT_DISABLED))
+			continue;
+		pp = ap->private_data;
+		if (!pp || pp->state != adma_state_pkt)
+			continue;
+		qc = ata_qc_from_tag(ap, ap->active_tag);
+		drv_stat = 0;
+		if ((status & (aPERR | aPSD | aUIRQ)))
+			drv_stat = ATA_ERR;
+		else if (pp->pkt[0] != cDONE)
+			drv_stat = ATA_ERR;
+		ata_qc_complete(qc, drv_stat);
+	}
+	return handled;
+}
+
+static inline unsigned int adma_intr_mmio(struct ata_host_set *host_set)
+{
+	unsigned int handled = 0, port_no;
+
+	for (port_no = 0; port_no < host_set->n_ports; ++port_no) {
+		struct ata_port *ap;
+		ap = host_set->ports[port_no];
+		if (ap && (!(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR)))) {
+			struct ata_queued_cmd *qc;
+			struct adma_port_priv *pp = ap->private_data;
+			if (!pp || pp->state != adma_state_mmio)
+				continue;
+			qc = ata_qc_from_tag(ap, ap->active_tag);
+			if (qc && (!(qc->tf.ctl & ATA_NIEN))) {
+
+				/* check main status, clearing INTRQ */
+				u8 status = ata_chk_status(ap);
+				if ((status & ATA_BUSY))
+					continue;
+				DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
+					ap->id, qc->tf.protocol, status);
+		
+				/* complete taskfile transaction */
+				pp->state = adma_state_idle;
+				ata_qc_complete(qc, status);
+				handled = 1;
+			}
+		}
+	}
+	return handled;
+}
+
+static irqreturn_t adma_intr(int irq, void *dev_instance, struct pt_regs *regs)
+{
+	struct ata_host_set *host_set = dev_instance;
+	unsigned int handled = 0;
+
+	VPRINTK("ENTER\n");
+
+	spin_lock(&host_set->lock);
+	handled  = adma_intr_pkt(host_set) | adma_intr_mmio(host_set);
+	spin_unlock(&host_set->lock);
+
+	VPRINTK("EXIT\n");
+
+	return IRQ_RETVAL(handled);
+}
+
+static void adma_ata_setup_port(struct ata_ioports *port, unsigned long base)
+{
+	port->cmd_addr		=
+	port->data_addr		= base + 0x000;
+	port->error_addr	=
+	port->feature_addr	= base + 0x004;
+	port->nsect_addr	= base + 0x008;
+	port->lbal_addr		= base + 0x00c;
+	port->lbam_addr		= base + 0x010;
+	port->lbah_addr		= base + 0x014;
+	port->device_addr	= base + 0x018;
+	port->status_addr	=
+	port->command_addr	= base + 0x01c;
+	port->altstatus_addr	=
+	port->ctl_addr		= base + 0x038;
+}
+
+static int adma_port_start(struct ata_port *ap)
+{
+	struct device *dev = ap->host_set->dev;
+	struct adma_port_priv *pp;
+	int rc;
+
+	rc = ata_port_start(ap);
+	if (rc)
+		return rc;
+	adma_enter_reg_mode(ap);
+	rc = -ENOMEM;
+	pp = kcalloc(1, sizeof(*pp), GFP_KERNEL);
+	if (!pp)
+		goto err_out;
+	pp->pkt = dma_alloc_coherent(dev, ADMA_PKT_BYTES, &pp->pkt_dma,
+								GFP_KERNEL);
+	if (!pp->pkt)
+		goto err_out_kfree;
+	/* paranoia? */
+	if ((pp->pkt_dma & 7) != 0) {
+		printk("bad alignment for pp->pkt_dma: %08x\n",
+						(u32)pp->pkt_dma);
+		goto err_out_kfree2;
+	}
+	memset(pp->pkt, 0, ADMA_PKT_BYTES);
+	ap->private_data = pp;
+	adma_reinit_engine(ap);
+	return 0;
+
+err_out_kfree2:
+	kfree(pp);
+err_out_kfree:
+	kfree(pp);
+err_out:
+	ata_port_stop(ap);
+	return rc;
+}
+
+static void adma_port_stop(struct ata_port *ap)
+{
+	struct device *dev = ap->host_set->dev;
+	struct adma_port_priv *pp = ap->private_data;
+
+	adma_reset_engine(ADMA_REGS(ap->host_set->mmio_base, ap->port_no));
+	if (pp != NULL) {
+		ap->private_data = NULL;
+		if (pp->pkt != NULL)
+			dma_free_coherent(dev, ADMA_PKT_BYTES,
+					pp->pkt, pp->pkt_dma);
+		kfree(pp);
+	}
+	ata_port_stop(ap);
+}
+
+static void adma_host_stop(struct ata_host_set *host_set)
+{
+	unsigned int port_no;
+
+	for (port_no = 0; port_no < ADMA_PORTS; ++port_no)
+		adma_reset_engine(ADMA_REGS(host_set->mmio_base, port_no));
+
+	ata_pci_host_stop(host_set);
+}
+
+static void adma_host_init(unsigned int chip_id,
+				struct ata_probe_ent *probe_ent)
+{
+	unsigned int port_no;
+	void __iomem *mmio_base = probe_ent->mmio_base;
+
+	/* enable/lock aGO operation */
+	writeb(7, mmio_base + ADMA_MODE_LOCK);
+
+	/* reset the ADMA logic */
+	for (port_no = 0; port_no < ADMA_PORTS; ++port_no)
+		adma_reset_engine(ADMA_REGS(mmio_base, port_no));
+}
+
+static int adma_set_dma_masks(struct pci_dev *pdev, void __iomem *mmio_base)
+{
+	int rc;
+
+	rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
+	if (rc) {
+		printk(KERN_ERR DRV_NAME
+			"(%s): 32-bit DMA enable failed\n",
+			pci_name(pdev));
+		return rc;
+	}
+	rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
+	if (rc) {
+		printk(KERN_ERR DRV_NAME
+			"(%s): 32-bit consistent DMA enable failed\n",
+			pci_name(pdev));
+		return rc;
+	}
+	return 0;
+}
+
+static int adma_ata_init_one(struct pci_dev *pdev,
+				const struct pci_device_id *ent)
+{
+	static int printed_version;
+	struct ata_probe_ent *probe_ent = NULL;
+	void __iomem *mmio_base;
+	unsigned int board_idx = (unsigned int) ent->driver_data;
+	int rc, port_no;
+
+	if (!printed_version++)
+		printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
+
+	rc = pci_enable_device(pdev);
+	if (rc)
+		return rc;
+
+	rc = pci_request_regions(pdev, DRV_NAME);
+	if (rc)
+		goto err_out;
+
+	if ((pci_resource_flags(pdev, 4) & IORESOURCE_MEM) == 0) {
+		rc = -ENODEV;
+		goto err_out_regions;
+	}
+
+	mmio_base = pci_iomap(pdev, 4, 0);
+	if (mmio_base == NULL) {
+		rc = -ENOMEM;
+		goto err_out_regions;
+	}
+
+	rc = adma_set_dma_masks(pdev, mmio_base);
+	if (rc)
+		goto err_out_iounmap;
+
+	probe_ent = kcalloc(1, sizeof(*probe_ent), GFP_KERNEL);
+	if (probe_ent == NULL) {
+		rc = -ENOMEM;
+		goto err_out_iounmap;
+	}
+
+	probe_ent->dev = pci_dev_to_dev(pdev);
+	INIT_LIST_HEAD(&probe_ent->node);
+
+	probe_ent->sht		= adma_port_info[board_idx].sht;
+	probe_ent->host_flags	= adma_port_info[board_idx].host_flags;
+	probe_ent->pio_mask	= adma_port_info[board_idx].pio_mask;
+	probe_ent->mwdma_mask	= adma_port_info[board_idx].mwdma_mask;
+	probe_ent->udma_mask	= adma_port_info[board_idx].udma_mask;
+	probe_ent->port_ops	= adma_port_info[board_idx].port_ops;
+
+	probe_ent->irq		= pdev->irq;
+	probe_ent->irq_flags	= SA_SHIRQ;
+	probe_ent->mmio_base	= mmio_base;
+	probe_ent->n_ports	= ADMA_PORTS;
+
+	for (port_no = 0; port_no < probe_ent->n_ports; ++port_no) {
+		adma_ata_setup_port(&probe_ent->port[port_no],
+			ADMA_ATA_REGS((unsigned long)mmio_base, port_no));
+	}
+
+	pci_set_master(pdev);
+
+	/* initialize adapter */
+	adma_host_init(board_idx, probe_ent);
+
+	rc = ata_device_add(probe_ent);
+	kfree(probe_ent);
+	if (rc != ADMA_PORTS)
+		goto err_out_iounmap;
+	return 0;
+
+err_out_iounmap:
+	pci_iounmap(pdev, mmio_base);
+err_out_regions:
+	pci_release_regions(pdev);
+err_out:
+	pci_disable_device(pdev);
+	return rc;
+}
+
+static int __init adma_ata_init(void)
+{
+	return pci_module_init(&adma_ata_pci_driver);
+}
+
+static void __exit adma_ata_exit(void)
+{
+	pci_unregister_driver(&adma_ata_pci_driver);
+}
+
+MODULE_AUTHOR("Mark Lord");
+MODULE_DESCRIPTION("Pacific Digital Corporation ADMA low-level driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, adma_ata_pci_tbl);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(adma_ata_init);
+module_exit(adma_ata_exit);