Canyonlands SATA harddisk driver

This patch adds a SATA harddisk driver for the canyonlands.
This patch is kernel driver's porting.
This patch corresponded to not cmd_scsi but cmd_sata.
This patch divided an unused member with ifndef __U_BOOT__ in the structure.

[environment variable, boot script]
setenv bootargs root=/dev/sda7 rw
setenv bootargs ${bootargs} console=ttyS0,115200
ext2load sata 0:2 0x400000 /canyonlands/uImage
ext2load sata 0:2 0x800000 /canyonlands/canyonlands.dtb
fdt addr 0x800000 0x4000
bootm 0x400000 - 0x800000

If you drive SATA-2 disk on Canyonlands, you must change parts from
PI2PCIE212 to PI2PCIE2212 on U25. We confirmed to boot by using
following disks:

1.Vendor: Fujitsu	 Type: MHW2040BS
2.Vendor: Fujitsu	 Type: MHW2060BK
3.Vendor: HAGIWARA SYS-COM:HFD25S-032GT
4.Vendor: WesternDigital Type: WD3200BJKT (CONFIG_LBA48 required)
5.Vendor: WesternDigital Type: WD3200BEVT (CONFIG_LBA48 required)
6.Vendor: Hitachi	 Type: HTS543232L9A300 (CONFIG_LBA48 required)
7.Vendor: Seagate	 Type: ST31000333AS (CONFIG_LBA48 required)
8.Vendor: Transcend	 Type: TS32GSSD25S-M
9.Vendor: MTRON		 Type: MSD-SATA1525-016

Signed-off-by: Kazuaki Ichinohe <kazuichi at fsi.co.jp>

3 files changed, 2588 insertions, 0 deletions

diff --git a/drivers/block/Makefile b/drivers/block/Makefile
index eccefc1..3f6ad5c 100644
--- a/drivers/block/Makefile
+++ b/drivers/block/Makefile
@@ -31,6 +31,7 @@ COBJS-$(CONFIG_FSL_SATA) += fsl_sata.o
 COBJS-$(CONFIG_IDE_SIL680) += sil680.o
 COBJS-$(CONFIG_LIBATA) += libata.o
 COBJS-$(CONFIG_PATA_BFIN) += pata_bfin.o
+COBJS-$(CONFIG_SATA_DWC) += sata_dwc.o
 COBJS-$(CONFIG_SATA_SIL3114) += sata_sil3114.o
 COBJS-$(CONFIG_SCSI_AHCI) += ahci.o
 COBJS-$(CONFIG_SCSI_SYM53C8XX) += sym53c8xx.o
diff --git a/drivers/block/sata_dwc.c b/drivers/block/sata_dwc.c
new file mode 100644
index 0000000..b2b3804
--- /dev/null
+++ b/drivers/block/sata_dwc.c
@@ -0,0 +1,2110 @@
+/*
+ * sata_dwc.c
+ *
+ * Synopsys DesignWare Cores (DWC) SATA host driver
+ *
+ * Author: Mark Miesfeld <mmiesfeld@amcc.com>
+ *
+ * Ported from 2.6.19.2 to 2.6.25/26 by Stefan Roese <sr@denx.de>
+ * Copyright 2008 DENX Software Engineering
+ *
+ * Based on versions provided by AMCC and Synopsys which are:
+ *          Copyright 2006 Applied Micro Circuits Corporation
+ *          COPYRIGHT (C) 2005  SYNOPSYS, INC.  ALL RIGHTS RESERVED
+ *
+ * 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.
+ *
+ */
+/*
+ * SATA support based on the chip canyonlands.
+ *
+ * 04-17-2009
+ *		The local version of this driver for the canyonlands board
+ *		does not use interrupts but polls the chip instead.
+ */
+
+#include <common.h>
+#include <command.h>
+#include <pci.h>
+#include <asm/processor.h>
+#include <asm/errno.h>
+#include <asm/io.h>
+#include <malloc.h>
+#include <ata.h>
+#include <linux/ctype.h>
+
+#include "sata_dwc.h"
+
+#define DMA_NUM_CHANS			1
+#define DMA_NUM_CHAN_REGS		8
+
+#define AHB_DMA_BRST_DFLT		16
+
+struct dmareg {
+	u32 low;
+	u32 high;
+};
+
+struct dma_chan_regs {
+	struct dmareg sar;
+	struct dmareg dar;
+	struct dmareg llp;
+	struct dmareg ctl;
+	struct dmareg sstat;
+	struct dmareg dstat;
+	struct dmareg sstatar;
+	struct dmareg dstatar;
+	struct dmareg cfg;
+	struct dmareg sgr;
+	struct dmareg dsr;
+};
+
+struct dma_interrupt_regs {
+	struct dmareg tfr;
+	struct dmareg block;
+	struct dmareg srctran;
+	struct dmareg dsttran;
+	struct dmareg error;
+};
+
+struct ahb_dma_regs {
+	struct dma_chan_regs	chan_regs[DMA_NUM_CHAN_REGS];
+	struct dma_interrupt_regs	interrupt_raw;
+	struct dma_interrupt_regs	interrupt_status;
+	struct dma_interrupt_regs	interrupt_mask;
+	struct dma_interrupt_regs	interrupt_clear;
+	struct dmareg			statusInt;
+	struct dmareg			rq_srcreg;
+	struct dmareg			rq_dstreg;
+	struct dmareg			rq_sgl_srcreg;
+	struct dmareg			rq_sgl_dstreg;
+	struct dmareg			rq_lst_srcreg;
+	struct dmareg			rq_lst_dstreg;
+	struct dmareg			dma_cfg;
+	struct dmareg			dma_chan_en;
+	struct dmareg			dma_id;
+	struct dmareg			dma_test;
+	struct dmareg			res1;
+	struct dmareg			res2;
+	/* DMA Comp Params
+	 * Param 6 = dma_param[0], Param 5 = dma_param[1],
+	 * Param 4 = dma_param[2] ...
+	 */
+	struct dmareg			dma_params[6];
+};
+
+#define DMA_EN			0x00000001
+#define DMA_DI			0x00000000
+#define DMA_CHANNEL(ch)		(0x00000001 << (ch))
+#define DMA_ENABLE_CHAN(ch)	((0x00000001 << (ch)) |	\
+				((0x000000001 << (ch)) << 8))
+#define DMA_DISABLE_CHAN(ch)	(0x00000000 | 	\
+				((0x000000001 << (ch)) << 8))
+
+#define SATA_DWC_MAX_PORTS	1
+#define SATA_DWC_SCR_OFFSET	0x24
+#define SATA_DWC_REG_OFFSET	0x64
+
+struct sata_dwc_regs {
+	u32 fptagr;
+	u32 fpbor;
+	u32 fptcr;
+	u32 dmacr;
+	u32 dbtsr;
+	u32 intpr;
+	u32 intmr;
+	u32 errmr;
+	u32 llcr;
+	u32 phycr;
+	u32 physr;
+	u32 rxbistpd;
+	u32 rxbistpd1;
+	u32 rxbistpd2;
+	u32 txbistpd;
+	u32 txbistpd1;
+	u32 txbistpd2;
+	u32 bistcr;
+	u32 bistfctr;
+	u32 bistsr;
+	u32 bistdecr;
+	u32 res[15];
+	u32 testr;
+	u32 versionr;
+	u32 idr;
+	u32 unimpl[192];
+	u32 dmadr[256];
+};
+
+#define SATA_DWC_TXFIFO_DEPTH		0x01FF
+#define SATA_DWC_RXFIFO_DEPTH		0x01FF
+
+#define SATA_DWC_DBTSR_MWR(size)	((size / 4) & SATA_DWC_TXFIFO_DEPTH)
+#define SATA_DWC_DBTSR_MRD(size)	(((size / 4) &	\
+					SATA_DWC_RXFIFO_DEPTH) << 16)
+#define SATA_DWC_INTPR_DMAT		0x00000001
+#define SATA_DWC_INTPR_NEWFP		0x00000002
+#define SATA_DWC_INTPR_PMABRT		0x00000004
+#define SATA_DWC_INTPR_ERR		0x00000008
+#define SATA_DWC_INTPR_NEWBIST		0x00000010
+#define SATA_DWC_INTPR_IPF		0x10000000
+#define SATA_DWC_INTMR_DMATM		0x00000001
+#define SATA_DWC_INTMR_NEWFPM		0x00000002
+#define SATA_DWC_INTMR_PMABRTM		0x00000004
+#define SATA_DWC_INTMR_ERRM		0x00000008
+#define SATA_DWC_INTMR_NEWBISTM		0x00000010
+
+#define SATA_DWC_DMACR_TMOD_TXCHEN	0x00000004
+#define SATA_DWC_DMACR_TXRXCH_CLEAR	SATA_DWC_DMACR_TMOD_TXCHEN
+
+#define SATA_DWC_QCMD_MAX	32
+
+#define SATA_DWC_SERROR_ERR_BITS	0x0FFF0F03
+
+#define HSDEVP_FROM_AP(ap)	(struct sata_dwc_device_port*)	\
+				(ap)->private_data
+
+struct sata_dwc_device {
+	struct device		*dev;
+	struct ata_probe_ent	*pe;
+	struct ata_host		*host;
+	u8			*reg_base;
+	struct sata_dwc_regs	*sata_dwc_regs;
+	int			irq_dma;
+};
+
+struct sata_dwc_device_port {
+	struct sata_dwc_device	*hsdev;
+	int			cmd_issued[SATA_DWC_QCMD_MAX];
+	u32			dma_chan[SATA_DWC_QCMD_MAX];
+	int			dma_pending[SATA_DWC_QCMD_MAX];
+};
+
+enum {
+	SATA_DWC_CMD_ISSUED_NOT		= 0,
+	SATA_DWC_CMD_ISSUED_PEND	= 1,
+	SATA_DWC_CMD_ISSUED_EXEC	= 2,
+	SATA_DWC_CMD_ISSUED_NODATA	= 3,
+
+	SATA_DWC_DMA_PENDING_NONE	= 0,
+	SATA_DWC_DMA_PENDING_TX		= 1,
+	SATA_DWC_DMA_PENDING_RX		= 2,
+};
+
+#define msleep(a)	udelay(a * 1000)
+#define ssleep(a)	msleep(a * 1000)
+
+static int ata_probe_timeout = (ATA_TMOUT_INTERNAL / 100);
+
+enum sata_dev_state {
+	SATA_INIT = 0,
+	SATA_READY = 1,
+	SATA_NODEVICE = 2,
+	SATA_ERROR = 3,
+};
+enum sata_dev_state dev_state = SATA_INIT;
+
+static struct ahb_dma_regs		*sata_dma_regs = 0;
+static struct ata_host			*phost;
+static struct ata_port			ap;
+static struct ata_port			*pap = &ap;
+static struct ata_device		ata_device;
+static struct sata_dwc_device_port	dwc_devp;
+
+static void	*scr_addr_sstatus;
+static u32	temp_n_block = 0;
+
+static unsigned ata_exec_internal(struct ata_device *dev,
+			struct ata_taskfile *tf, const u8 *cdb,
+			int dma_dir, unsigned int buflen,
+			unsigned long timeout);
+static unsigned int ata_dev_set_feature(struct ata_device *dev,
+			u8 enable,u8 feature);
+static unsigned int ata_dev_init_params(struct ata_device *dev,
+			u16 heads, u16 sectors);
+static u8 ata_irq_on(struct ata_port *ap);
+static struct ata_queued_cmd *__ata_qc_from_tag(struct ata_port *ap,
+			unsigned int tag);
+static int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
+			u8 status, int in_wq);
+static void ata_tf_to_host(struct ata_port *ap,
+			const struct ata_taskfile *tf);
+static void ata_exec_command(struct ata_port *ap,
+			const struct ata_taskfile *tf);
+static unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc);
+static u8 ata_check_altstatus(struct ata_port *ap);
+static u8 ata_check_status(struct ata_port *ap);
+static void ata_dev_select(struct ata_port *ap, unsigned int device,
+			unsigned int wait, unsigned int can_sleep);
+static void ata_qc_issue(struct ata_queued_cmd *qc);
+static void ata_tf_load(struct ata_port *ap,
+			const struct ata_taskfile *tf);
+static int ata_dev_read_sectors(unsigned char* pdata,
+			unsigned long datalen, u32 block, u32 n_block);
+static int ata_dev_write_sectors(unsigned char* pdata,
+			unsigned long datalen , u32 block, u32 n_block);
+static void ata_std_dev_select(struct ata_port *ap, unsigned int device);
+static void ata_qc_complete(struct ata_queued_cmd *qc);
+static void __ata_qc_complete(struct ata_queued_cmd *qc);
+static void fill_result_tf(struct ata_queued_cmd *qc);
+static void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
+static void ata_mmio_data_xfer(struct ata_device *dev,
+			unsigned char *buf,
+			unsigned int buflen,int do_write);
+static void ata_pio_task(struct ata_port *arg_ap);
+static void __ata_port_freeze(struct ata_port *ap);
+static int ata_port_freeze(struct ata_port *ap);
+static void ata_qc_free(struct ata_queued_cmd *qc);
+static void ata_pio_sectors(struct ata_queued_cmd *qc);
+static void ata_pio_sector(struct ata_queued_cmd *qc);
+static void ata_pio_queue_task(struct ata_port *ap,
+			void *data,unsigned long delay);
+static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq);
+static int sata_dwc_softreset(struct ata_port *ap);
+static int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
+		unsigned int flags, u16 *id);
+static int check_sata_dev_state(void);
+
+extern block_dev_desc_t sata_dev_desc[CONFIG_SYS_SATA_MAX_DEVICE];
+
+static const struct ata_port_info sata_dwc_port_info[] = {
+	{
+		.flags		= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+				ATA_FLAG_MMIO | ATA_FLAG_PIO_POLLING |
+				ATA_FLAG_SRST | ATA_FLAG_NCQ,
+		.pio_mask	= 0x1f,
+		.mwdma_mask	= 0x07,
+		.udma_mask	= 0x7f,
+	},
+};
+
+int init_sata(int dev)
+{
+	struct sata_dwc_device hsdev;
+	struct ata_host host;
+	struct ata_port_info pi = sata_dwc_port_info[0];
+	struct ata_link *link;
+	struct sata_dwc_device_port hsdevp = dwc_devp;
+	u8 *base = 0;
+	u8 *sata_dma_regs_addr = 0;
+	u8 status;
+	unsigned long base_addr = 0;
+	int chan = 0;
+	int rc;
+	int i;
+
+	phost = &host;
+
+	base = (u8*)SATA_BASE_ADDR;
+
+	hsdev.sata_dwc_regs = (void *__iomem)(base + SATA_DWC_REG_OFFSET);
+
+	host.n_ports = SATA_DWC_MAX_PORTS;
+
+	for (i = 0; i < SATA_DWC_MAX_PORTS; i++) {
+		ap.pflags |= ATA_PFLAG_INITIALIZING;
+		ap.flags = ATA_FLAG_DISABLED;
+		ap.print_id = -1;
+		ap.ctl = ATA_DEVCTL_OBS;
+		ap.host = &host;
+		ap.last_ctl = 0xFF;
+
+		link = &ap.link;
+		link->ap = &ap;
+		link->pmp = 0;
+		link->active_tag = ATA_TAG_POISON;
+		link->hw_sata_spd_limit = 0;
+
+		ap.port_no = i;
+		host.ports[i] = &ap;
+	}
+
+	ap.pio_mask = pi.pio_mask;
+	ap.mwdma_mask = pi.mwdma_mask;
+	ap.udma_mask = pi.udma_mask;
+	ap.flags |= pi.flags;
+	ap.link.flags |= pi.link_flags;
+
+	host.ports[0]->ioaddr.cmd_addr = base;
+	host.ports[0]->ioaddr.scr_addr = base + SATA_DWC_SCR_OFFSET;
+	scr_addr_sstatus = base + SATA_DWC_SCR_OFFSET;
+
+	base_addr = (unsigned long)base;
+
+	host.ports[0]->ioaddr.cmd_addr = (void *)base_addr + 0x00;
+	host.ports[0]->ioaddr.data_addr = (void *)base_addr + 0x00;
+
+	host.ports[0]->ioaddr.error_addr = (void *)base_addr + 0x04;
+	host.ports[0]->ioaddr.feature_addr = (void *)base_addr + 0x04;
+
+	host.ports[0]->ioaddr.nsect_addr = (void *)base_addr + 0x08;
+
+	host.ports[0]->ioaddr.lbal_addr = (void *)base_addr + 0x0c;
+	host.ports[0]->ioaddr.lbam_addr = (void *)base_addr + 0x10;
+	host.ports[0]->ioaddr.lbah_addr = (void *)base_addr + 0x14;
+
+	host.ports[0]->ioaddr.device_addr = (void *)base_addr + 0x18;
+	host.ports[0]->ioaddr.command_addr = (void *)base_addr + 0x1c;
+	host.ports[0]->ioaddr.status_addr = (void *)base_addr + 0x1c;
+
+	host.ports[0]->ioaddr.altstatus_addr = (void *)base_addr + 0x20;
+	host.ports[0]->ioaddr.ctl_addr = (void *)base_addr + 0x20;
+
+	sata_dma_regs_addr = (u8*)SATA_DMA_REG_ADDR;
+	sata_dma_regs = (void *__iomem)sata_dma_regs_addr;
+
+	status = ata_check_altstatus(&ap);
+
+	if (status == 0x7f) {
+		printf("Hard Disk not found.\n");
+		dev_state = SATA_NODEVICE;
+		rc = FALSE;
+		return rc;
+	}
+
+	printf("Waiting for device...");
+	i = 0;
+	while (1) {
+		udelay(10000);
+
+		status = ata_check_altstatus(&ap);
+
+		if ((status & ATA_BUSY) == 0) {
+			printf("\n");
+			break;
+		}
+
+		i++;
+		if (i > (ATA_RESET_TIME * 100)) {
+			printf("** TimeOUT **\n");
+
+			dev_state = SATA_NODEVICE;
+			rc = FALSE;
+			return rc;
+		}
+		if ((i >= 100) && ((i % 100) == 0))
+			printf(".");
+	}
+
+	rc = sata_dwc_softreset(&ap);
+
+	if (rc) {
+		printf("sata_dwc : error. soft reset failed\n");
+		return rc;
+	}
+
+	for (chan = 0; chan < DMA_NUM_CHANS; chan++) {
+		out_le32(&(sata_dma_regs->interrupt_mask.error.low),
+				DMA_DISABLE_CHAN(chan));
+
+		out_le32(&(sata_dma_regs->interrupt_mask.tfr.low),
+				DMA_DISABLE_CHAN(chan));
+	}
+
+	out_le32(&(sata_dma_regs->dma_cfg.low), DMA_DI);
+
+	out_le32(&hsdev.sata_dwc_regs->intmr,
+		SATA_DWC_INTMR_ERRM |
+		SATA_DWC_INTMR_PMABRTM);
+
+	/* Unmask the error bits that should trigger
+	 * an error interrupt by setting the error mask register.
+	 */
+	out_le32(&hsdev.sata_dwc_regs->errmr, SATA_DWC_SERROR_ERR_BITS);
+
+	hsdev.host = ap.host;
+	memset(&hsdevp, 0, sizeof(hsdevp));
+	hsdevp.hsdev = &hsdev;
+
+	for (i = 0; i < SATA_DWC_QCMD_MAX; i++)
+		hsdevp.cmd_issued[i] = SATA_DWC_CMD_ISSUED_NOT;
+
+	out_le32((void __iomem *)scr_addr_sstatus + 4,
+		in_le32((void __iomem *)scr_addr_sstatus + 4));
+
+	rc = 0;
+	return rc;
+}
+
+static u8 ata_check_altstatus(struct ata_port *ap)
+{
+	u8 val = 0;
+	val = readb(ap->ioaddr.altstatus_addr);
+	return val;
+}
+
+static int sata_dwc_softreset(struct ata_port *ap)
+{
+	u8 nsect,lbal = 0;
+	u8 tmp = 0;
+	u32 serror = 0;
+	u8 status = 0;
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+
+	serror = in_le32((void *)ap->ioaddr.scr_addr + (SCR_ERROR * 4));
+
+	writeb(0x55, ioaddr->nsect_addr);
+	writeb(0xaa, ioaddr->lbal_addr);
+	writeb(0xaa, ioaddr->nsect_addr);
+	writeb(0x55, ioaddr->lbal_addr);
+	writeb(0x55, ioaddr->nsect_addr);
+	writeb(0xaa, ioaddr->lbal_addr);
+
+	nsect = readb(ioaddr->nsect_addr);
+	lbal = readb(ioaddr->lbal_addr);
+
+	if ((nsect == 0x55) && (lbal == 0xaa)) {
+		printf("Device found\n");
+	} else {
+		printf("No device found\n");
+		dev_state = SATA_NODEVICE;
+		return FALSE;
+	}
+
+	tmp = ATA_DEVICE_OBS;
+	writeb(tmp, ioaddr->device_addr);
+	writeb(ap->ctl, ioaddr->ctl_addr);
+
+	udelay(200);
+
+	writeb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
+
+	udelay(200);
+	writeb(ap->ctl, ioaddr->ctl_addr);
+
+	msleep(150);
+	status = ata_check_status(ap);
+
+	msleep(50);
+	ata_check_status(ap);
+
+	while (1) {
+		u8 status = ata_check_status(ap);
+
+		if (!(status & ATA_BUSY))
+			break;
+
+		printf("Hard Disk status is BUSY.\n");
+		msleep(50);
+	}
+
+	tmp = ATA_DEVICE_OBS;
+	writeb(tmp, ioaddr->device_addr);
+
+	nsect = readb(ioaddr->nsect_addr);
+	lbal = readb(ioaddr->lbal_addr);
+
+	return 0;
+}
+
+static u8 ata_check_status(struct ata_port *ap)
+{
+	u8 val = 0;
+	val = readb(ap->ioaddr.status_addr);
+	return val;
+}
+
+static int ata_id_has_hipm(const u16 *id)
+{
+	u16 val = id[76];
+
+	if (val == 0 || val == 0xffff)
+		return -1;
+
+	return val & (1 << 9);
+}
+
+static int ata_id_has_dipm(const u16 *id)
+{
+	u16 val = id[78];
+
+	if (val == 0 || val == 0xffff)
+		return -1;
+
+	return val & (1 << 3);
+}
+
+int scan_sata(int dev)
+{
+	int i;
+	int rc;
+	u8 status;
+	const u16 *id;
+	struct ata_device *ata_dev = &ata_device;
+	unsigned long pio_mask, mwdma_mask, udma_mask;
+	unsigned long xfer_mask;
+	char revbuf[7];
+	u16 iobuf[ATA_SECTOR_WORDS];
+
+	memset(iobuf, 0, sizeof(iobuf));
+
+	if (dev_state == SATA_NODEVICE)
+		return 1;
+
+	printf("Waiting for device...");
+	i = 0;
+	while (1) {
+		udelay(10000);
+
+		status = ata_check_altstatus(&ap);
+
+		if ((status & ATA_BUSY) == 0) {
+			printf("\n");
+			break;
+		}
+
+		i++;
+		if (i > (ATA_RESET_TIME * 100)) {
+			printf("** TimeOUT **\n");
+
+			dev_state = SATA_NODEVICE;
+			return 1;
+		}
+		if ((i >= 100) && ((i % 100) == 0))
+			printf(".");
+	}
+
+	udelay(1000);
+
+	rc = ata_dev_read_id(ata_dev, &ata_dev->class,
+			ATA_READID_POSTRESET,ata_dev->id);
+	if (rc) {
+		printf("sata_dwc : error. failed sata scan\n");
+		return 1;
+	}
+
+	/* SATA drives indicate we have a bridge. We don't know which
+	 * end of the link the bridge is which is a problem
+	 */
+	if (ata_id_is_sata(ata_dev->id))
+		ap.cbl = ATA_CBL_SATA;
+
+	id = ata_dev->id;
+
+	ata_dev->flags &= ~ATA_DFLAG_CFG_MASK;
+	ata_dev->max_sectors = 0;
+	ata_dev->cdb_len = 0;
+	ata_dev->n_sectors = 0;
+	ata_dev->cylinders = 0;
+	ata_dev->heads = 0;
+	ata_dev->sectors = 0;
+
+	if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
+		pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
+		pio_mask <<= 3;
+		pio_mask |= 0x7;
+	} else {
+		/* If word 64 isn't valid then Word 51 high byte holds
+		 * the PIO timing number for the maximum. Turn it into
+		 * a mask.
+		 */
+		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
+		if (mode < 5) {
+			pio_mask = (2 << mode) - 1;
+		} else {
+			pio_mask = 1;
+		}
+	}
+
+	mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
+
+	if (ata_id_is_cfa(id)) {
+		int pio = id[163] & 0x7;
+		int dma = (id[163] >> 3) & 7;
+
+		if (pio)
+			pio_mask |= (1 << 5);
+		if (pio > 1)
+			pio_mask |= (1 << 6);
+		if (dma)
+			mwdma_mask |= (1 << 3);
+		if (dma > 1)
+			mwdma_mask |= (1 << 4);
+	}
+
+	udma_mask = 0;
+	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
+		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
+
+	xfer_mask = ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
+		((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
+		((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
+
+	if (ata_dev->class == ATA_DEV_ATA) {
+		if (ata_id_is_cfa(id)) {
+			if (id[162] & 1)
+				printf("supports DRM functions and may "
+					"not be fully accessable.\n");
+			sprintf(revbuf, "%s", "CFA");
+		} else {
+			if (ata_id_has_tpm(id))
+				printf("supports DRM functions and may "
+						"not be fully accessable.\n");
+		}
+
+		ata_dev->n_sectors = ata_id_n_sectors((u16*)id);
+
+		if (ata_dev->id[59] & 0x100)
+			ata_dev->multi_count = ata_dev->id[59] & 0xff;
+
+		if (ata_id_has_lba(id)) {
+			const char *lba_desc;
+			char ncq_desc[20];
+
+			lba_desc = "LBA";
+			ata_dev->flags |= ATA_DFLAG_LBA;
+			if (ata_id_has_lba48(id)) {
+				ata_dev->flags |= ATA_DFLAG_LBA48;
+				lba_desc = "LBA48";
+
+				if (ata_dev->n_sectors >= (1UL << 28) &&
+					ata_id_has_flush_ext(id))
+					ata_dev->flags |= ATA_DFLAG_FLUSH_EXT;
+			}
+			if (!ata_id_has_ncq(ata_dev->id))
+				ncq_desc[0] = '\0';
+
+			if (ata_dev->horkage & ATA_HORKAGE_NONCQ)
+				sprintf(ncq_desc, "%s", "NCQ (not used)");
+
+			if (ap.flags & ATA_FLAG_NCQ)
+				ata_dev->flags |= ATA_DFLAG_NCQ;
+		}
+		ata_dev->cdb_len = 16;
+	}
+	ata_dev->max_sectors = ATA_MAX_SECTORS;
+	if (ata_dev->flags & ATA_DFLAG_LBA48)
+		ata_dev->max_sectors = ATA_MAX_SECTORS_LBA48;
+
+	if (!(ata_dev->horkage & ATA_HORKAGE_IPM)) {
+		if (ata_id_has_hipm(ata_dev->id))
+			ata_dev->flags |= ATA_DFLAG_HIPM;
+		if (ata_id_has_dipm(ata_dev->id))
+			ata_dev->flags |= ATA_DFLAG_DIPM;
+	}
+
+	if ((ap.cbl == ATA_CBL_SATA) && (!ata_id_is_sata(ata_dev->id))) {
+		ata_dev->udma_mask &= ATA_UDMA5;
+		ata_dev->max_sectors = ATA_MAX_SECTORS;
+	}
+
+	if (ata_dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
+		printf("Drive reports diagnostics failure."
+				"This may indicate a drive\n");
+		printf("fault or invalid emulation."
+				"Contact drive vendor for information.\n");
+	}
+
+	rc = check_sata_dev_state();
+
+	ata_id_c_string(ata_dev->id,
+			(unsigned char *)sata_dev_desc[dev].revision,
+			 ATA_ID_FW_REV, sizeof(sata_dev_desc[dev].revision));
+	ata_id_c_string(ata_dev->id,
+			(unsigned char *)sata_dev_desc[dev].vendor,
+			 ATA_ID_PROD, sizeof(sata_dev_desc[dev].vendor));
+	ata_id_c_string(ata_dev->id,
+			(unsigned char *)sata_dev_desc[dev].product,
+			 ATA_ID_SERNO, sizeof(sata_dev_desc[dev].product));
+
+	sata_dev_desc[dev].lba = (u32) ata_dev->n_sectors;
+
+#ifdef CONFIG_LBA48
+	if (ata_dev->id[83] & (1 << 10)) {
+		sata_dev_desc[dev].lba48 = 1;
+	} else {
+		sata_dev_desc[dev].lba48 = 0;
+	}
+#endif
+
+	return 0;
+}
+
+static u8 ata_busy_wait(struct ata_port *ap,
+		unsigned int bits,unsigned int max)
+{
+	u8 status;
+
+	do {
+		udelay(10);
+		status = ata_check_status(ap);
+		max--;
+	} while (status != 0xff && (status & bits) && (max > 0));
+
+	return status;
+}
+
+static int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
+		unsigned int flags, u16 *id)
+{
+	struct ata_port *ap = pap;
+	unsigned int class = *p_class;
+	struct ata_taskfile tf;
+	unsigned int err_mask = 0;
+	const char *reason;
+	int may_fallback = 1, tried_spinup = 0;
+	u8 status;
+	int rc;
+
+	status = ata_busy_wait(ap, ATA_BUSY, 30000);
+	if (status & ATA_BUSY) {
+		printf("BSY = 0 check. timeout.\n");
+		rc = FALSE;
+		return rc;
+	}
+
+	ata_dev_select(ap, dev->devno, 1, 1);
+
+retry:
+	memset(&tf, 0, sizeof(tf));
+	ap->print_id = 1;
+	ap->flags &= ~ATA_FLAG_DISABLED;
+	tf.ctl = ap->ctl;
+	tf.device = ATA_DEVICE_OBS;
+	tf.command = ATA_CMD_ID_ATA;
+	tf.protocol = ATA_PROT_PIO;
+
+	/* Some devices choke if TF registers contain garbage.  Make
+	 * sure those are properly initialized.
+	 */
+	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+
+	/* Device presence detection is unreliable on some
+	 * controllers.  Always poll IDENTIFY if available.
+	 */
+	tf.flags |= ATA_TFLAG_POLLING;
+
+	temp_n_block = 1;
+
+	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
+					sizeof(id[0]) * ATA_ID_WORDS, 0);
+
+	if (err_mask) {
+		if (err_mask & AC_ERR_NODEV_HINT) {
+			printf("NODEV after polling detection\n");
+			return -ENOENT;
+		}
+
+		if ((err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
+			/* Device or controller might have reported
+			 * the wrong device class.  Give a shot at the
+			 * other IDENTIFY if the current one is
+			 * aborted by the device.
+			 */
+			if (may_fallback) {
+				may_fallback = 0;
+
+				if (class == ATA_DEV_ATA) {
+					class = ATA_DEV_ATAPI;
+				} else {
+					class = ATA_DEV_ATA;
+				}
+				goto retry;
+			}
+			/* Control reaches here iff the device aborted
+			 * both flavors of IDENTIFYs which happens
+			 * sometimes with phantom devices.
+			 */
+			printf("both IDENTIFYs aborted, assuming NODEV\n");
+			return -ENOENT;
+		}
+		rc = -EIO;
+		reason = "I/O error";
+		goto err_out;
+	}
+
+	/* Falling back doesn't make sense if ID data was read
+	 * successfully at least once.
+	 */
+	may_fallback = 0;
+
+	unsigned int id_cnt;
+
+	for (id_cnt = 0; id_cnt < ATA_ID_WORDS; id_cnt++)
+		id[id_cnt] = le16_to_cpu(id[id_cnt]);
+
+
+	rc = -EINVAL;
+	reason = "device reports invalid type";
+
+	if (class == ATA_DEV_ATA) {
+		if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
+			goto err_out;
+	} else {
+		if (ata_id_is_ata(id))
+			goto err_out;
+	}
+	if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
+		tried_spinup = 1;
+		/*
+		 * Drive powered-up in standby mode, and requires a specific
+		 * SET_FEATURES spin-up subcommand before it will accept
+		 * anything other than the original IDENTIFY command.
+		 */
+		err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
+		if (err_mask && id[2] != 0x738c) {
+			rc = -EIO;
+			reason = "SPINUP failed";
+			goto err_out;
+		}
+		/*
+		 * If the drive initially returned incomplete IDENTIFY info,
+		 * we now must reissue the IDENTIFY command.
+		 */
+		if (id[2] == 0x37c8)
+			goto retry;
+	}
+
+	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
+		/*
+		 * The exact sequence expected by certain pre-ATA4 drives is:
+		 * SRST RESET
+		 * IDENTIFY (optional in early ATA)
+		 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
+		 * anything else..
+		 * Some drives were very specific about that exact sequence.
+		 *
+		 * Note that ATA4 says lba is mandatory so the second check
+		 * shoud never trigger.
+		 */
+		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
+			err_mask = ata_dev_init_params(dev, id[3], id[6]);
+			if (err_mask) {
+				rc = -EIO;
+				reason = "INIT_DEV_PARAMS failed";
+				goto err_out;
+			}
+
+			/* current CHS translation info (id[53-58]) might be
+			 * changed. reread the identify device info.
+			 */
+			flags &= ~ATA_READID_POSTRESET;
+			goto retry;
+		}
+	}
+
+	*p_class = class;
+	return 0;
+
+err_out:
+	return rc;
+}
+
+static u8 ata_wait_idle(struct ata_port *ap)
+{
+	u8 status = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
+	return status;
+}
+
+static void ata_dev_select(struct ata_port *ap, unsigned int device,
+		unsigned int wait, unsigned int can_sleep)
+{
+	if (wait)
+		ata_wait_idle(ap);
+
+	ata_std_dev_select(ap, device);
+
+	if (wait)
+		ata_wait_idle(ap);
+}
+
+static void ata_std_dev_select(struct ata_port *ap, unsigned int device)
+{
+	u8 tmp;
+
+	if (device == 0) {
+		tmp = ATA_DEVICE_OBS;
+	} else {
+		tmp = ATA_DEVICE_OBS | ATA_DEV1;
+	}
+
+	writeb(tmp, ap->ioaddr.device_addr);
+
+	readb(ap->ioaddr.altstatus_addr);
+
+	udelay(1);
+}
+
+static int waiting_for_reg_state(volatile u8 *offset,
+				int timeout_msec,
+				u32 sign)
+{
+	int i;
+	u32 status;
+
+	for (i = 0; i < timeout_msec; i++) {
+		status = readl(offset);
+		if ((status & sign) != 0)
+			break;
+		msleep(1);
+	}
+
+	return (i < timeout_msec) ? 0 : -1;
+}
+
+static void ata_qc_reinit(struct ata_queued_cmd *qc)
+{
+	qc->dma_dir = DMA_NONE;
+	qc->flags = 0;
+	qc->nbytes = qc->extrabytes = qc->curbytes = 0;
+	qc->n_elem = 0;
+	qc->err_mask = 0;
+	qc->sect_size = ATA_SECT_SIZE;
+	qc->nbytes = ATA_SECT_SIZE * temp_n_block;
+
+	memset(&qc->tf, 0, sizeof(qc->tf));
+	qc->tf.ctl = 0;
+	qc->tf.device = ATA_DEVICE_OBS;
+
+	qc->result_tf.command = ATA_DRDY;
+	qc->result_tf.feature = 0;
+}
+
+struct ata_queued_cmd *__ata_qc_from_tag(struct ata_port *ap,
+					unsigned int tag)
+{
+	if (tag < ATA_MAX_QUEUE)
+		return &ap->qcmd[tag];
+	return NULL;
+}
+
+static void __ata_port_freeze(struct ata_port *ap)
+{
+	printf("set port freeze.\n");
+	ap->pflags |= ATA_PFLAG_FROZEN;
+}
+
+static int ata_port_freeze(struct ata_port *ap)
+{
+	__ata_port_freeze(ap);
+	return 0;
+}
+
+unsigned ata_exec_internal(struct ata_device *dev,
+			struct ata_taskfile *tf, const u8 *cdb,
+			int dma_dir, unsigned int buflen,
+			unsigned long timeout)
+{
+	struct ata_link *link = dev->link;
+	struct ata_port *ap = pap;
+	struct ata_queued_cmd *qc;
+	unsigned int tag, preempted_tag;
+	u32 preempted_sactive, preempted_qc_active;
+	int preempted_nr_active_links;
+	unsigned int err_mask;
+	int rc = 0;
+	u8 status;
+
+	status = ata_busy_wait(ap, ATA_BUSY, 300000);
+	if (status & ATA_BUSY) {
+		printf("BSY = 0 check. timeout.\n");
+		rc = FALSE;
+		return rc;
+	}
+
+	if (ap->pflags & ATA_PFLAG_FROZEN)
+		return AC_ERR_SYSTEM;
+
+	tag = ATA_TAG_INTERNAL;
+
+	if (test_and_set_bit(tag, &ap->qc_allocated)) {
+		rc = FALSE;
+		return rc;
+	}
+
+	qc = __ata_qc_from_tag(ap, tag);
+	qc->tag = tag;
+	qc->ap = ap;
+	qc->dev = dev;
+
+	ata_qc_reinit(qc);
+
+	preempted_tag = link->active_tag;
+	preempted_sactive = link->sactive;
+	preempted_qc_active = ap->qc_active;
+	preempted_nr_active_links = ap->nr_active_links;
+	link->active_tag = ATA_TAG_POISON;
+	link->sactive = 0;
+	ap->qc_active = 0;
+	ap->nr_active_links = 0;
+
+	qc->tf = *tf;
+	if (cdb)
+		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
+	qc->flags |= ATA_QCFLAG_RESULT_TF;
+	qc->dma_dir = dma_dir;
+	qc->private_data = 0;
+
+	ata_qc_issue(qc);
+
+	if (!timeout)
+		timeout = ata_probe_timeout * 1000 / HZ;
+
+	status = ata_busy_wait(ap, ATA_BUSY, 30000);
+	if (status & ATA_BUSY) {
+		printf("BSY = 0 check. timeout.\n");
+		printf("altstatus = 0x%x.\n", status);
+		qc->err_mask |= AC_ERR_OTHER;
+		return qc->err_mask;
+	}
+
+	if (waiting_for_reg_state(ap->ioaddr.altstatus_addr, 1000, 0x8)) {
+		u8 status = 0;
+		u8 errorStatus = 0;
+
+		status = readb(ap->ioaddr.altstatus_addr);
+		if ((status & 0x01) != 0) {
+			errorStatus = readb(ap->ioaddr.feature_addr);
+			if (errorStatus == 0x04 &&
+				qc->tf.command == ATA_CMD_PIO_READ_EXT){
+				printf("Hard Disk doesn't support LBA48\n");
+				dev_state = SATA_ERROR;
+				qc->err_mask |= AC_ERR_OTHER;
+				return qc->err_mask;
+			}
+		}
+		qc->err_mask |= AC_ERR_OTHER;
+		return qc->err_mask;
+	}
+
+	status = ata_busy_wait(ap, ATA_BUSY, 10);
+	if (status & ATA_BUSY) {
+		printf("BSY = 0 check. timeout.\n");
+		qc->err_mask |= AC_ERR_OTHER;
+		return qc->err_mask;
+	}
+
+	ata_pio_task(ap);
+
+	if (!rc) {
+		if (qc->flags & ATA_QCFLAG_ACTIVE) {
+			qc->err_mask |= AC_ERR_TIMEOUT;
+			ata_port_freeze(ap);
+		}
+	}
+
+	if (qc->flags & ATA_QCFLAG_FAILED) {
+		if (qc->result_tf.command & (ATA_ERR | ATA_DF))
+			qc->err_mask |= AC_ERR_DEV;
+
+		if (!qc->err_mask)
+			qc->err_mask |= AC_ERR_OTHER;
+
+		if (qc->err_mask & ~AC_ERR_OTHER)
+			qc->err_mask &= ~AC_ERR_OTHER;
+	}
+
+	*tf = qc->result_tf;
+	err_mask = qc->err_mask;
+	ata_qc_free(qc);
+	link->active_tag = preempted_tag;
+	link->sactive = preempted_sactive;
+	ap->qc_active = preempted_qc_active;
+	ap->nr_active_links = preempted_nr_active_links;
+
+	if (ap->flags & ATA_FLAG_DISABLED) {
+		err_mask |= AC_ERR_SYSTEM;
+		ap->flags &= ~ATA_FLAG_DISABLED;
+	}
+
+	return err_mask;
+}
+
+static void ata_qc_issue(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct ata_link *link = qc->dev->link;
+	u8 prot = qc->tf.protocol;
+
+	if (ata_is_ncq(prot)) {
+		if (!link->sactive)
+			ap->nr_active_links++;
+		link->sactive |= 1 << qc->tag;
+	} else {
+		ap->nr_active_links++;
+		link->active_tag = qc->tag;
+	}
+
+	qc->flags |= ATA_QCFLAG_ACTIVE;
+	ap->qc_active |= 1 << qc->tag;
+
+	if (qc->dev->flags & ATA_DFLAG_SLEEPING) {
+		msleep(1);
+		return;
+	}
+
+	qc->err_mask |= ata_qc_issue_prot(qc);
+	if (qc->err_mask)
+		goto err;
+
+	return;
+err:
+	ata_qc_complete(qc);
+}
+
+static unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+
+	if (ap->flags & ATA_FLAG_PIO_POLLING) {
+		switch (qc->tf.protocol) {
+		case ATA_PROT_PIO:
+		case ATA_PROT_NODATA:
+		case ATAPI_PROT_PIO:
+		case ATAPI_PROT_NODATA:
+			qc->tf.flags |= ATA_TFLAG_POLLING;
+			break;
+		default:
+			break;
+		}
+	}
+
+	ata_dev_select(ap, qc->dev->devno, 1, 0);
+
+	switch (qc->tf.protocol) {
+	case ATA_PROT_PIO:
+		if (qc->tf.flags & ATA_TFLAG_POLLING)
+			qc->tf.ctl |= ATA_NIEN;
+
+		ata_tf_to_host(ap, &qc->tf);
+
+		ap->hsm_task_state = HSM_ST;
+
+		if (qc->tf.flags & ATA_TFLAG_POLLING)
+			ata_pio_queue_task(ap, qc, 0);
+
+		break;
+
+	default:
+		return AC_ERR_SYSTEM;
+	}
+
+	return 0;
+}
+
+static void ata_tf_to_host(struct ata_port *ap,
+			const struct ata_taskfile *tf)
+{
+	ata_tf_load(ap, tf);
+	ata_exec_command(ap, tf);
+}
+
+static void ata_tf_load(struct ata_port *ap,
+			const struct ata_taskfile *tf)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+	unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
+
+	if (tf->ctl != ap->last_ctl) {
+		if (ioaddr->ctl_addr)
+			writeb(tf->ctl, ioaddr->ctl_addr);
+		ap->last_ctl = tf->ctl;
+		ata_wait_idle(ap);
+	}
+
+	if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
+		writeb(tf->hob_feature, ioaddr->feature_addr);
+		writeb(tf->hob_nsect, ioaddr->nsect_addr);
+		writeb(tf->hob_lbal, ioaddr->lbal_addr);
+		writeb(tf->hob_lbam, ioaddr->lbam_addr);
+		writeb(tf->hob_lbah, ioaddr->lbah_addr);
+	}
+
+	if (is_addr) {
+		writeb(tf->feature, ioaddr->feature_addr);
+		writeb(tf->nsect, ioaddr->nsect_addr);
+		writeb(tf->lbal, ioaddr->lbal_addr);
+		writeb(tf->lbam, ioaddr->lbam_addr);
+		writeb(tf->lbah, ioaddr->lbah_addr);
+	}
+
+	if (tf->flags & ATA_TFLAG_DEVICE)
+		writeb(tf->device, ioaddr->device_addr);
+
+	ata_wait_idle(ap);
+}
+
+static void ata_exec_command(struct ata_port *ap,
+			const struct ata_taskfile *tf)
+{
+	writeb(tf->command, ap->ioaddr.command_addr);
+
+	readb(ap->ioaddr.altstatus_addr);
+
+	udelay(1);
+}
+
+static void ata_pio_queue_task(struct ata_port *ap,
+			void *data,unsigned long delay)
+{
+	ap->port_task_data = data;
+}
+
+static unsigned int ac_err_mask(u8 status)
+{
+	if (status & (ATA_BUSY | ATA_DRQ))
+		return AC_ERR_HSM;
+	if (status & (ATA_ERR | ATA_DF))
+		return AC_ERR_DEV;
+	return 0;
+}
+
+static unsigned int __ac_err_mask(u8 status)
+{
+	unsigned int mask = ac_err_mask(status);
+	if (mask == 0)
+		return AC_ERR_OTHER;
+	return mask;
+}
+
+static void ata_pio_task(struct ata_port *arg_ap)
+{
+	struct ata_port *ap = arg_ap;
+	struct ata_queued_cmd *qc = ap->port_task_data;
+	u8 status;
+	int poll_next;
+
+fsm_start:
+	/*
+	 * This is purely heuristic.  This is a fast path.
+	 * Sometimes when we enter, BSY will be cleared in
+	 * a chk-status or two.  If not, the drive is probably seeking
+	 * or something.  Snooze for a couple msecs, then
+	 * chk-status again.  If still busy, queue delayed work.
+	 */
+	status = ata_busy_wait(ap, ATA_BUSY, 5);
+	if (status & ATA_BUSY) {
+		msleep(2);
+		status = ata_busy_wait(ap, ATA_BUSY, 10);
+		if (status & ATA_BUSY) {
+			ata_pio_queue_task(ap, qc, ATA_SHORT_PAUSE);
+			return;
+		}
+	}
+
+	poll_next = ata_hsm_move(ap, qc, status, 1);
+
+	/* another command or interrupt handler
+	 * may be running at this point.
+	 */
+	if (poll_next)
+		goto fsm_start;
+}
+
+static int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
+			u8 status, int in_wq)
+{
+	int poll_next;
+
+fsm_start:
+	switch (ap->hsm_task_state) {
+	case HSM_ST_FIRST:
+		poll_next = (qc->tf.flags & ATA_TFLAG_POLLING);
+
+		if ((status & ATA_DRQ) == 0) {
+			if (status & (ATA_ERR | ATA_DF)) {
+				qc->err_mask |= AC_ERR_DEV;
+			} else {
+				qc->err_mask |= AC_ERR_HSM;
+			}
+			ap->hsm_task_state = HSM_ST_ERR;
+			goto fsm_start;
+		}
+
+		/* Device should not ask for data transfer (DRQ=1)
+		 * when it finds something wrong.
+		 * We ignore DRQ here and stop the HSM by
+		 * changing hsm_task_state to HSM_ST_ERR and
+		 * let the EH abort the command or reset the device.
+		 */
+		if (status & (ATA_ERR | ATA_DF)) {
+			if (!(qc->dev->horkage & ATA_HORKAGE_STUCK_ERR)) {
+				printf("DRQ=1 with device error, "
+					"dev_stat 0x%X\n", status);
+				qc->err_mask |= AC_ERR_HSM;
+				ap->hsm_task_state = HSM_ST_ERR;
+				goto fsm_start;
+			}
+		}
+
+		if (qc->tf.protocol == ATA_PROT_PIO) {
+			/* PIO data out protocol.
+			 * send first data block.
+			 */
+			/* ata_pio_sectors() might change the state
+			 * to HSM_ST_LAST. so, the state is changed here
+			 * before ata_pio_sectors().
+			 */
+			ap->hsm_task_state = HSM_ST;
+			ata_pio_sectors(qc);
+		} else {
+			printf("protocol is not ATA_PROT_PIO \n");
+		}
+		break;
+
+	case HSM_ST:
+		if ((status & ATA_DRQ) == 0) {
+			if (status & (ATA_ERR | ATA_DF)) {
+				qc->err_mask |= AC_ERR_DEV;
+			} else {
+				/* HSM violation. Let EH handle this.
+				 * Phantom devices also trigger this
+				 * condition.  Mark hint.
+				 */
+				qc->err_mask |= AC_ERR_HSM | AC_ERR_NODEV_HINT;
+			}
+
+			ap->hsm_task_state = HSM_ST_ERR;
+			goto fsm_start;
+		}
+		/* For PIO reads, some devices may ask for
+		 * data transfer (DRQ=1) alone with ERR=1.
+		 * We respect DRQ here and transfer one
+		 * block of junk data before changing the
+		 * hsm_task_state to HSM_ST_ERR.
+		 *
+		 * For PIO writes, ERR=1 DRQ=1 doesn't make
+		 * sense since the data block has been
+		 * transferred to the device.
+		 */
+		if (status & (ATA_ERR | ATA_DF)) {
+			qc->err_mask |= AC_ERR_DEV;
+
+			if (!(qc->tf.flags & ATA_TFLAG_WRITE)) {
+				ata_pio_sectors(qc);
+				status = ata_wait_idle(ap);
+			}
+
+			if (status & (ATA_BUSY | ATA_DRQ))
+				qc->err_mask |= AC_ERR_HSM;
+
+			/* ata_pio_sectors() might change the
+			 * state to HSM_ST_LAST. so, the state
+			 * is changed after ata_pio_sectors().
+			 */
+			ap->hsm_task_state = HSM_ST_ERR;
+			goto fsm_start;
+		}
+
+		ata_pio_sectors(qc);
+		if (ap->hsm_task_state == HSM_ST_LAST &&
+			(!(qc->tf.flags & ATA_TFLAG_WRITE))) {
+			status = ata_wait_idle(ap);
+			goto fsm_start;
+		}
+
+		poll_next = 1;
+		break;
+
+	case HSM_ST_LAST:
+		if (!ata_ok(status)) {
+			qc->err_mask |= __ac_err_mask(status);
+			ap->hsm_task_state = HSM_ST_ERR;
+			goto fsm_start;
+		}
+
+		ap->hsm_task_state = HSM_ST_IDLE;
+
+		ata_hsm_qc_complete(qc, in_wq);
+
+		poll_next = 0;
+		break;
+
+	case HSM_ST_ERR:
+		/* make sure qc->err_mask is available to
+		 * know what's wrong and recover
+		 */
+		ap->hsm_task_state = HSM_ST_IDLE;
+
+		ata_hsm_qc_complete(qc, in_wq);
+
+		poll_next = 0;
+		break;
+	default:
+		poll_next = 0;
+	}
+
+	return poll_next;
+}
+
+static void ata_pio_sectors(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap;
+	ap = pap;
+	qc->pdata = ap->pdata;
+
+	ata_pio_sector(qc);
+
+	readb(qc->ap->ioaddr.altstatus_addr);
+	udelay(1);
+}
+
+static void ata_pio_sector(struct ata_queued_cmd *qc)
+{
+	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
+	struct ata_port *ap = qc->ap;
+	unsigned int offset;
+	unsigned char *buf;
+	char temp_data_buf[512];
+
+	if (qc->curbytes == qc->nbytes - qc->sect_size)
+		ap->hsm_task_state = HSM_ST_LAST;
+
+	offset = qc->curbytes;
+
+	switch (qc->tf.command) {
+	case ATA_CMD_ID_ATA:
+		buf = (unsigned char *)&ata_device.id[0];
+		break;
+	case ATA_CMD_PIO_READ_EXT:
+	case ATA_CMD_PIO_READ:
+	case ATA_CMD_PIO_WRITE_EXT:
+	case ATA_CMD_PIO_WRITE:
+		buf = qc->pdata + offset;
+		break;
+	default:
+		buf = (unsigned char *)&temp_data_buf[0];
+	}
+
+	ata_mmio_data_xfer(qc->dev, buf, qc->sect_size, do_write);
+
+	qc->curbytes += qc->sect_size;
+
+}
+
+static void ata_mmio_data_xfer(struct ata_device *dev, unsigned char *buf,
+				unsigned int buflen, int do_write)
+{
+	struct ata_port *ap = pap;
+	void __iomem *data_addr = ap->ioaddr.data_addr;
+	unsigned int words = buflen >> 1;
+	u16 *buf16 = (u16 *)buf;
+	unsigned int i = 0;
+
+	udelay(100);
+	if (do_write) {
+		for (i = 0; i < words; i++)
+			writew(le16_to_cpu(buf16[i]), data_addr);
+	} else {
+		for (i = 0; i < words; i++)
+			buf16[i] = cpu_to_le16(readw(data_addr));
+	}
+
+	if (buflen & 0x01) {
+		__le16 align_buf[1] = { 0 };
+		unsigned char *trailing_buf = buf + buflen - 1;
+
+		if (do_write) {
+			memcpy(align_buf, trailing_buf, 1);
+			writew(le16_to_cpu(align_buf[0]), data_addr);
+		} else {
+			align_buf[0] = cpu_to_le16(readw(data_addr));
+			memcpy(trailing_buf, align_buf, 1);
+		}
+	}
+}
+
+static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq)
+{
+	struct ata_port *ap = qc->ap;
+
+	if (in_wq) {
+		/* EH might have kicked in while host lock is
+		 * released.
+		 */
+		qc = &ap->qcmd[qc->tag];
+		if (qc) {
+			if (!(qc->err_mask & AC_ERR_HSM)) {
+				ata_irq_on(ap);
+				ata_qc_complete(qc);
+			} else {
+				ata_port_freeze(ap);
+			}
+		}
+	} else {
+		if (!(qc->err_mask & AC_ERR_HSM)) {
+			ata_qc_complete(qc);
+		} else {
+			ata_port_freeze(ap);
+		}
+	}
+}
+
+static u8 ata_irq_on(struct ata_port *ap)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+	u8 tmp;
+
+	ap->ctl &= ~ATA_NIEN;
+	ap->last_ctl = ap->ctl;
+
+	if (ioaddr->ctl_addr)
+		writeb(ap->ctl, ioaddr->ctl_addr);
+
+	tmp = ata_wait_idle(ap);
+
+	return tmp;
+}
+
+static unsigned int ata_tag_internal(unsigned int tag)
+{
+	return tag == ATA_MAX_QUEUE - 1;
+}
+
+static void ata_qc_complete(struct ata_queued_cmd *qc)
+{
+	struct ata_device *dev = qc->dev;
+	if (qc->err_mask)
+		qc->flags |= ATA_QCFLAG_FAILED;
+
+	if (qc->flags & ATA_QCFLAG_FAILED) {
+		if (!ata_tag_internal(qc->tag)) {
+			fill_result_tf(qc);
+			return;
+		}
+	}
+	if (qc->flags & ATA_QCFLAG_RESULT_TF)
+		fill_result_tf(qc);
+
+	/* Some commands need post-processing after successful
+	 * completion.
+	 */
+	switch (qc->tf.command) {
+	case ATA_CMD_SET_FEATURES:
+		if (qc->tf.feature != SETFEATURES_WC_ON &&
+				qc->tf.feature != SETFEATURES_WC_OFF)
+			break;
+	case ATA_CMD_INIT_DEV_PARAMS:
+	case ATA_CMD_SET_MULTI:
+		break;
+
+	case ATA_CMD_SLEEP:
+		dev->flags |= ATA_DFLAG_SLEEPING;
+		break;
+	}
+
+	__ata_qc_complete(qc);
+}
+
+static void fill_result_tf(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+
+	qc->result_tf.flags = qc->tf.flags;
+	ata_tf_read(ap, &qc->result_tf);
+}
+
+static void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+
+	tf->command = ata_check_status(ap);
+	tf->feature = readb(ioaddr->error_addr);
+	tf->nsect = readb(ioaddr->nsect_addr);
+	tf->lbal = readb(ioaddr->lbal_addr);
+	tf->lbam = readb(ioaddr->lbam_addr);
+	tf->lbah = readb(ioaddr->lbah_addr);
+	tf->device = readb(ioaddr->device_addr);
+
+	if (tf->flags & ATA_TFLAG_LBA48) {
+		if (ioaddr->ctl_addr) {
+			writeb(tf->ctl | ATA_HOB, ioaddr->ctl_addr);
+
+			tf->hob_feature = readb(ioaddr->error_addr);
+			tf->hob_nsect = readb(ioaddr->nsect_addr);
+			tf->hob_lbal = readb(ioaddr->lbal_addr);
+			tf->hob_lbam = readb(ioaddr->lbam_addr);
+			tf->hob_lbah = readb(ioaddr->lbah_addr);
+
+			writeb(tf->ctl, ioaddr->ctl_addr);
+			ap->last_ctl = tf->ctl;
+		} else {
+			printf("sata_dwc warnning register read.\n");
+		}
+	}
+}
+
+static void __ata_qc_complete(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct ata_link *link = qc->dev->link;
+
+	link->active_tag = ATA_TAG_POISON;
+	ap->nr_active_links--;
+
+	if (qc->flags & ATA_QCFLAG_CLEAR_EXCL && ap->excl_link == link)
+		ap->excl_link = NULL;
+
+	qc->flags &= ~ATA_QCFLAG_ACTIVE;
+	ap->qc_active &= ~(1 << qc->tag);
+}
+
+static void ata_qc_free(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	unsigned int tag;
+	qc->flags = 0;
+	tag = qc->tag;
+	if (tag < ATA_MAX_QUEUE) {
+		qc->tag = ATA_TAG_POISON;
+		clear_bit(tag, &ap->qc_allocated);
+	}
+}
+
+static int check_sata_dev_state(void)
+{
+	unsigned long datalen;
+	unsigned char *pdata;
+	int ret = 0;
+	int i = 0;
+	char temp_data_buf[512];
+
+	while (1) {
+		udelay(10000);
+
+		pdata = (unsigned char*)&temp_data_buf[0];
+		datalen = 512;
+
+		ret = ata_dev_read_sectors(pdata, datalen, 0, 1);
+
+		if (ret == TRUE)
+			break;
+
+		i++;
+		if (i > (ATA_RESET_TIME * 100)) {
+			printf("** TimeOUT **\n");
+			dev_state = SATA_NODEVICE;
+			return FALSE;
+		}
+
+		if ((i >= 100) && ((i % 100) == 0))
+			printf(".");
+	}
+
+	dev_state = SATA_READY;
+
+	return TRUE;
+}
+
+static unsigned int ata_dev_set_feature(struct ata_device *dev,
+				u8 enable, u8 feature)
+{
+	struct ata_taskfile tf;
+	struct ata_port *ap;
+	ap = pap;
+	unsigned int err_mask;
+
+	memset(&tf, 0, sizeof(tf));
+	tf.ctl = ap->ctl;
+
+	tf.device = ATA_DEVICE_OBS;
+	tf.command = ATA_CMD_SET_FEATURES;
+	tf.feature = enable;
+	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+	tf.protocol = ATA_PROT_NODATA;
+	tf.nsect = feature;
+
+	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, 0, 0);
+
+	return err_mask;
+}
+
+static unsigned int ata_dev_init_params(struct ata_device *dev,
+				u16 heads, u16 sectors)
+{
+	struct ata_taskfile tf;
+	struct ata_port *ap;
+	ap = pap;
+	unsigned int err_mask;
+
+	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
+		return AC_ERR_INVALID;
+
+	memset(&tf, 0, sizeof(tf));
+	tf.ctl = ap->ctl;
+	tf.device = ATA_DEVICE_OBS;
+	tf.command = ATA_CMD_INIT_DEV_PARAMS;
+	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+	tf.protocol = ATA_PROT_NODATA;
+	tf.nsect = sectors;
+	tf.device |= (heads - 1) & 0x0f;
+
+	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, 0, 0);
+
+	if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
+		err_mask = 0;
+
+	return err_mask;
+}
+
+#if defined(CONFIG_SATA_DWC) && !defined(CONFIG_LBA48)
+#define SATA_MAX_READ_BLK 0xFF
+#else
+#define SATA_MAX_READ_BLK 0xFFFF
+#endif
+
+ulong sata_read(int device, ulong blknr, lbaint_t blkcnt, void *buffer)
+{
+	ulong start,blks, buf_addr;
+	unsigned short smallblks;
+	unsigned long datalen;
+	unsigned char *pdata;
+	device &= 0xff;
+
+	u32 block = 0;
+	u32 n_block = 0;
+
+	if (dev_state != SATA_READY)
+		return 0;
+
+	buf_addr = (unsigned long)buffer;
+	start = blknr;
+	blks = blkcnt;
+	do {
+		pdata = (unsigned char *)buf_addr;
+		if (blks > SATA_MAX_READ_BLK) {
+			datalen = sata_dev_desc[device].blksz * SATA_MAX_READ_BLK;
+			smallblks = SATA_MAX_READ_BLK;
+
+			block = (u32)start;
+			n_block = (u32)smallblks;
+
+			start += SATA_MAX_READ_BLK;
+			blks -= SATA_MAX_READ_BLK;
+		} else {
+			datalen = sata_dev_desc[device].blksz * SATA_MAX_READ_BLK;
+			datalen = sata_dev_desc[device].blksz * blks;
+			smallblks = (unsigned short)blks;
+
+			block = (u32)start;
+			n_block = (u32)smallblks;
+
+			start += blks;
+			blks = 0;
+		}
+
+		if (ata_dev_read_sectors(pdata, datalen, block, n_block) != TRUE) {
+			printf("sata_dwc : Hard disk read error.\n");
+			blkcnt -= blks;
+			break;
+		}
+		buf_addr += datalen;
+	} while (blks != 0);
+
+	return (blkcnt);
+}
+
+static int ata_dev_read_sectors(unsigned char *pdata, unsigned long datalen,
+						u32 block, u32 n_block)
+{
+	struct ata_port *ap = pap;
+	struct ata_device *dev = &ata_device;
+	struct ata_taskfile tf;
+	unsigned int class = ATA_DEV_ATA;
+	unsigned int err_mask = 0;
+	const char *reason;
+	int may_fallback = 1;
+	int rc;
+
+	if (dev_state == SATA_ERROR)
+		return FALSE;
+
+	ata_dev_select(ap, dev->devno, 1, 1);
+
+retry:
+	memset(&tf, 0, sizeof(tf));
+	tf.ctl = ap->ctl;
+	ap->print_id = 1;
+	ap->flags &= ~ATA_FLAG_DISABLED;
+
+	ap->pdata = pdata;
+
+	tf.device = ATA_DEVICE_OBS;
+
+	temp_n_block = n_block;
+
+#ifdef CONFIG_LBA48
+	tf.command = ATA_CMD_PIO_READ_EXT;
+	tf.flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
+
+	tf.hob_feature = 31;
+	tf.feature = 31;
+	tf.hob_nsect = (n_block >> 8) & 0xff;
+	tf.nsect = n_block & 0xff;
+
+	tf.hob_lbah = 0x0;
+	tf.hob_lbam = 0x0;
+	tf.hob_lbal = (block >> 24) & 0xff;
+	tf.lbah = (block >> 16) & 0xff;
+	tf.lbam = (block >> 8) & 0xff;
+	tf.lbal = block & 0xff;
+
+	tf.device = 1 << 6;
+	if (tf.flags & ATA_TFLAG_FUA)
+		tf.device |= 1 << 7;
+#else
+	tf.command = ATA_CMD_PIO_READ;
+	tf.flags |= ATA_TFLAG_LBA ;
+
+	tf.feature = 31;
+	tf.nsect = n_block & 0xff;
+
+	tf.lbah = (block >> 16) & 0xff;
+	tf.lbam = (block >> 8) & 0xff;
+	tf.lbal = block & 0xff;
+
+	tf.device = (block >> 24) & 0xf;
+
+	tf.device |= 1 << 6;
+	if (tf.flags & ATA_TFLAG_FUA)
+		tf.device |= 1 << 7;
+
+#endif
+
+	tf.protocol = ATA_PROT_PIO;
+
+	/* Some devices choke if TF registers contain garbage.  Make
+	 * sure those are properly initialized.
+	 */
+	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+	tf.flags |= ATA_TFLAG_POLLING;
+
+	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE, 0, 0);
+
+	if (err_mask) {
+		if (err_mask & AC_ERR_NODEV_HINT) {
+			printf("READ_SECTORS NODEV after polling detection\n");
+			return -ENOENT;
+		}
+
+		if ((err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
+			/* Device or controller might have reported
+			 * the wrong device class.  Give a shot at the
+			 * other IDENTIFY if the current one is
+			 * aborted by the device.
+			 */
+			if (may_fallback) {
+				may_fallback = 0;
+
+				if (class == ATA_DEV_ATA) {
+					class = ATA_DEV_ATAPI;
+				} else {
+					class = ATA_DEV_ATA;
+				}
+				goto retry;
+			}
+			/* Control reaches here iff the device aborted
+			 * both flavors of IDENTIFYs which happens
+			 * sometimes with phantom devices.
+			 */
+			printf("both IDENTIFYs aborted, assuming NODEV\n");
+			return -ENOENT;
+		}
+
+		rc = -EIO;
+		reason = "I/O error";
+		goto err_out;
+	}
+
+	/* Falling back doesn't make sense if ID data was read
+	 * successfully at least once.
+	 */
+	may_fallback = 0;
+
+	rc = -EINVAL;
+	reason = "device reports invalid type";
+
+	return TRUE;
+
+err_out:
+	printf("failed to READ SECTORS (%s, err_mask=0x%x)\n", reason, err_mask);
+	return FALSE;
+}
+
+#if defined(CONFIG_SATA_DWC) && !defined(CONFIG_LBA48)
+#define SATA_MAX_WRITE_BLK 0xFF
+#else
+#define SATA_MAX_WRITE_BLK 0xFFFF
+#endif
+
+ulong sata_write(int device, ulong blknr, lbaint_t blkcnt, void *buffer)
+{
+	ulong start,blks, buf_addr;
+	unsigned short smallblks;
+	unsigned long datalen;
+	unsigned char *pdata;
+	device &= 0xff;
+
+
+	u32 block = 0;
+	u32 n_block = 0;
+
+	if (dev_state != SATA_READY)
+		return 0;
+
+	buf_addr = (unsigned long)buffer;
+	start = blknr;
+	blks = blkcnt;
+	do {
+		pdata = (unsigned char *)buf_addr;
+		if (blks > SATA_MAX_WRITE_BLK) {
+			datalen = sata_dev_desc[device].blksz * SATA_MAX_WRITE_BLK;
+			smallblks = SATA_MAX_WRITE_BLK;
+
+			block = (u32)start;
+			n_block = (u32)smallblks;
+
+			start += SATA_MAX_WRITE_BLK;
+			blks -= SATA_MAX_WRITE_BLK;
+		} else {
+			datalen = sata_dev_desc[device].blksz * blks;
+			smallblks = (unsigned short)blks;
+
+			block = (u32)start;
+			n_block = (u32)smallblks;
+
+			start += blks;
+			blks = 0;
+		}
+
+		if (ata_dev_write_sectors(pdata, datalen, block, n_block) != TRUE) {
+			printf("sata_dwc : Hard disk read error.\n");
+			blkcnt -= blks;
+			break;
+		}
+		buf_addr += datalen;
+	} while (blks != 0);
+
+	return (blkcnt);
+}
+
+static int ata_dev_write_sectors(unsigned char* pdata, unsigned long datalen,
+						u32 block, u32 n_block)
+{
+	struct ata_port *ap = pap;
+	struct ata_device *dev = &ata_device;
+	struct ata_taskfile tf;
+	unsigned int class = ATA_DEV_ATA;
+	unsigned int err_mask = 0;
+	const char *reason;
+	int may_fallback = 1;
+	int rc;
+
+	if (dev_state == SATA_ERROR)
+		return FALSE;
+
+	ata_dev_select(ap, dev->devno, 1, 1);
+
+retry:
+	memset(&tf, 0, sizeof(tf));
+	tf.ctl = ap->ctl;
+	ap->print_id = 1;
+	ap->flags &= ~ATA_FLAG_DISABLED;
+
+	ap->pdata = pdata;
+
+	tf.device = ATA_DEVICE_OBS;
+
+	temp_n_block = n_block;
+
+
+#ifdef CONFIG_LBA48
+	tf.command = ATA_CMD_PIO_WRITE_EXT;
+	tf.flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48 | ATA_TFLAG_WRITE;
+
+	tf.hob_feature = 31;
+	tf.feature = 31;
+	tf.hob_nsect = (n_block >> 8) & 0xff;
+	tf.nsect = n_block & 0xff;
+
+	tf.hob_lbah = 0x0;
+	tf.hob_lbam = 0x0;
+	tf.hob_lbal = (block >> 24) & 0xff;
+	tf.lbah = (block >> 16) & 0xff;
+	tf.lbam = (block >> 8) & 0xff;
+	tf.lbal = block & 0xff;
+
+	tf.device = 1 << 6;
+	if (tf.flags & ATA_TFLAG_FUA)
+		tf.device |= 1 << 7;
+#else
+	tf.command = ATA_CMD_PIO_WRITE;
+	tf.flags |= ATA_TFLAG_LBA | ATA_TFLAG_WRITE;
+
+	tf.feature = 31;
+	tf.nsect = n_block & 0xff;
+
+	tf.lbah = (block >> 16) & 0xff;
+	tf.lbam = (block >> 8) & 0xff;
+	tf.lbal = block & 0xff;
+
+	tf.device = (block >> 24) & 0xf;
+
+	tf.device |= 1 << 6;
+	if (tf.flags & ATA_TFLAG_FUA)
+		tf.device |= 1 << 7;
+
+#endif
+
+	tf.protocol = ATA_PROT_PIO;
+
+	/* Some devices choke if TF registers contain garbage.  Make
+	 * sure those are properly initialized.
+	 */
+	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+	tf.flags |= ATA_TFLAG_POLLING;
+
+	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE, 0, 0);
+
+	if (err_mask) {
+		if (err_mask & AC_ERR_NODEV_HINT) {
+			printf("READ_SECTORS NODEV after polling detection\n");
+			return -ENOENT;
+		}
+
+		if ((err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
+			/* Device or controller might have reported
+			 * the wrong device class.  Give a shot at the
+			 * other IDENTIFY if the current one is
+			 * aborted by the device.
+			 */
+			if (may_fallback) {
+				may_fallback = 0;
+
+				if (class == ATA_DEV_ATA) {
+					class = ATA_DEV_ATAPI;
+				} else {
+					class = ATA_DEV_ATA;
+				}
+				goto retry;
+			}
+			/* Control reaches here iff the device aborted
+			 * both flavors of IDENTIFYs which happens
+			 * sometimes with phantom devices.
+			 */
+			printf("both IDENTIFYs aborted, assuming NODEV\n");
+			return -ENOENT;
+		}
+
+		rc = -EIO;
+		reason = "I/O error";
+		goto err_out;
+	}
+
+	/* Falling back doesn't make sense if ID data was read
+	 * successfully at least once.
+	 */
+	may_fallback = 0;
+
+	rc = -EINVAL;
+	reason = "device reports invalid type";
+
+	return TRUE;
+
+err_out:
+	printf("failed to WRITE SECTORS (%s, err_mask=0x%x)\n", reason, err_mask);
+	return FALSE;
+}
diff --git a/drivers/block/sata_dwc.h b/drivers/block/sata_dwc.h
new file mode 100644
index 0000000..204d644
--- /dev/null
+++ b/drivers/block/sata_dwc.h
@@ -0,0 +1,477 @@
+/*
+ * sata_dwc.h
+ *
+ * Synopsys DesignWare Cores (DWC) SATA host driver
+ *
+ * Author: Mark Miesfeld <mmiesfeld@amcc.com>
+ *
+ * Ported from 2.6.19.2 to 2.6.25/26 by Stefan Roese <sr@denx.de>
+ * Copyright 2008 DENX Software Engineering
+ *
+ * Based on versions provided by AMCC and Synopsys which are:
+ *          Copyright 2006 Applied Micro Circuits Corporation
+ *          COPYRIGHT (C) 2005  SYNOPSYS, INC.  ALL RIGHTS RESERVED
+ *
+ * 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.
+ *
+ */
+/*
+ * SATA support based on the chip canyonlands.
+ *
+ * 04-17-2009
+ *		The local version of this driver for the canyonlands board
+ *		does not use interrupts but polls the chip instead.
+ */
+
+
+#ifndef _SATA_DWC_H_
+#define _SATA_DWC_H_
+
+#define __U_BOOT__
+
+#define HZ 100
+#define READ 0
+#define WRITE 1
+
+enum {
+	ATA_READID_POSTRESET	= (1 << 0),
+
+	ATA_DNXFER_PIO		= 0,
+	ATA_DNXFER_DMA		= 1,
+	ATA_DNXFER_40C		= 2,
+	ATA_DNXFER_FORCE_PIO	= 3,
+	ATA_DNXFER_FORCE_PIO0	= 4,
+
+	ATA_DNXFER_QUIET	= (1 << 31),
+};
+
+enum hsm_task_states {
+	HSM_ST_IDLE,
+	HSM_ST_FIRST,
+	HSM_ST,
+	HSM_ST_LAST,
+	HSM_ST_ERR,
+};
+
+#define	ATA_SHORT_PAUSE		((HZ >> 6) + 1)
+
+struct ata_queued_cmd {
+	struct ata_port		*ap;
+	struct ata_device	*dev;
+
+	struct ata_taskfile	tf;
+	u8			cdb[ATAPI_CDB_LEN];
+	unsigned long		flags;
+	unsigned int		tag;
+	unsigned int		n_elem;
+
+	int			dma_dir;
+	unsigned int		sect_size;
+
+	unsigned int		nbytes;
+	unsigned int		extrabytes;
+	unsigned int		curbytes;
+
+	unsigned int		err_mask;
+	struct ata_taskfile	result_tf;
+
+	void			*private_data;
+#ifndef __U_BOOT__
+	void			*lldd_task;
+#endif
+	unsigned char		*pdata;
+};
+
+typedef void (*ata_qc_cb_t) (struct ata_queued_cmd *qc);
+
+#define ATA_TAG_POISON	0xfafbfcfdU
+
+enum {
+	LIBATA_MAX_PRD		= ATA_MAX_PRD / 2,
+	LIBATA_DUMB_MAX_PRD	= ATA_MAX_PRD / 4,
+	ATA_MAX_PORTS		= 8,
+	ATA_DEF_QUEUE		= 1,
+	ATA_MAX_QUEUE		= 32,
+	ATA_TAG_INTERNAL	= ATA_MAX_QUEUE - 1,
+	ATA_MAX_BUS		= 2,
+	ATA_DEF_BUSY_WAIT	= 10000,
+
+	ATAPI_MAX_DRAIN		= 16 << 10,
+
+	ATA_SHT_EMULATED	= 1,
+	ATA_SHT_CMD_PER_LUN	= 1,
+	ATA_SHT_THIS_ID		= -1,
+	ATA_SHT_USE_CLUSTERING	= 1,
+
+	ATA_DFLAG_LBA		= (1 << 0),
+	ATA_DFLAG_LBA48		= (1 << 1),
+	ATA_DFLAG_CDB_INTR	= (1 << 2),
+	ATA_DFLAG_NCQ		= (1 << 3),
+	ATA_DFLAG_FLUSH_EXT	= (1 << 4),
+	ATA_DFLAG_ACPI_PENDING 	= (1 << 5),
+	ATA_DFLAG_ACPI_FAILED	= (1 << 6),
+	ATA_DFLAG_AN		= (1 << 7),
+	ATA_DFLAG_HIPM		= (1 << 8),
+	ATA_DFLAG_DIPM		= (1 << 9),
+	ATA_DFLAG_DMADIR	= (1 << 10),
+	ATA_DFLAG_CFG_MASK	= (1 << 12) - 1,
+
+	ATA_DFLAG_PIO		= (1 << 12),
+	ATA_DFLAG_NCQ_OFF	= (1 << 13),
+	ATA_DFLAG_SPUNDOWN	= (1 << 14),
+	ATA_DFLAG_SLEEPING	= (1 << 15),
+	ATA_DFLAG_DUBIOUS_XFER	= (1 << 16),
+	ATA_DFLAG_INIT_MASK	= (1 << 24) - 1,
+
+	ATA_DFLAG_DETACH	= (1 << 24),
+	ATA_DFLAG_DETACHED	= (1 << 25),
+
+	ATA_LFLAG_HRST_TO_RESUME	= (1 << 0),
+	ATA_LFLAG_SKIP_D2H_BSY		= (1 << 1),
+	ATA_LFLAG_NO_SRST		= (1 << 2),
+	ATA_LFLAG_ASSUME_ATA		= (1 << 3),
+	ATA_LFLAG_ASSUME_SEMB		= (1 << 4),
+	ATA_LFLAG_ASSUME_CLASS = ATA_LFLAG_ASSUME_ATA | ATA_LFLAG_ASSUME_SEMB,
+	ATA_LFLAG_NO_RETRY		= (1 << 5),
+	ATA_LFLAG_DISABLED		= (1 << 6),
+
+	ATA_FLAG_SLAVE_POSS	= (1 << 0),
+	ATA_FLAG_SATA		= (1 << 1),
+	ATA_FLAG_NO_LEGACY	= (1 << 2),
+	ATA_FLAG_MMIO		= (1 << 3),
+	ATA_FLAG_SRST		= (1 << 4),
+	ATA_FLAG_SATA_RESET	= (1 << 5),
+	ATA_FLAG_NO_ATAPI	= (1 << 6),
+	ATA_FLAG_PIO_DMA	= (1 << 7),
+	ATA_FLAG_PIO_LBA48	= (1 << 8),
+	ATA_FLAG_PIO_POLLING	= (1 << 9),
+	ATA_FLAG_NCQ		= (1 << 10),
+	ATA_FLAG_DEBUGMSG	= (1 << 13),
+	ATA_FLAG_IGN_SIMPLEX	= (1 << 15),
+	ATA_FLAG_NO_IORDY	= (1 << 16),
+	ATA_FLAG_ACPI_SATA	= (1 << 17),
+	ATA_FLAG_AN		= (1 << 18),
+	ATA_FLAG_PMP		= (1 << 19),
+	ATA_FLAG_IPM		= (1 << 20),
+
+	ATA_FLAG_DISABLED	= (1 << 23),
+
+	ATA_PFLAG_EH_PENDING		= (1 << 0),
+	ATA_PFLAG_EH_IN_PROGRESS	= (1 << 1),
+	ATA_PFLAG_FROZEN		= (1 << 2),
+	ATA_PFLAG_RECOVERED		= (1 << 3),
+	ATA_PFLAG_LOADING		= (1 << 4),
+	ATA_PFLAG_UNLOADING		= (1 << 5),
+	ATA_PFLAG_SCSI_HOTPLUG		= (1 << 6),
+	ATA_PFLAG_INITIALIZING		= (1 << 7),
+	ATA_PFLAG_RESETTING		= (1 << 8),
+	ATA_PFLAG_SUSPENDED		= (1 << 17),
+	ATA_PFLAG_PM_PENDING		= (1 << 18),
+
+	ATA_QCFLAG_ACTIVE	= (1 << 0),
+	ATA_QCFLAG_DMAMAP	= (1 << 1),
+	ATA_QCFLAG_IO		= (1 << 3),
+	ATA_QCFLAG_RESULT_TF	= (1 << 4),
+	ATA_QCFLAG_CLEAR_EXCL	= (1 << 5),
+	ATA_QCFLAG_QUIET	= (1 << 6),
+
+	ATA_QCFLAG_FAILED	= (1 << 16),
+	ATA_QCFLAG_SENSE_VALID	= (1 << 17),
+	ATA_QCFLAG_EH_SCHEDULED	= (1 << 18),
+
+	ATA_HOST_SIMPLEX	= (1 << 0),
+	ATA_HOST_STARTED	= (1 << 1),
+
+	ATA_TMOUT_BOOT			= 30 * 100,
+	ATA_TMOUT_BOOT_QUICK		= 7 * 100,
+	ATA_TMOUT_INTERNAL		= 30 * 100,
+	ATA_TMOUT_INTERNAL_QUICK	= 5 * 100,
+
+	/* FIXME: GoVault needs 2s but we can't afford that without
+	 * parallel probing.  800ms is enough for iVDR disk
+	 * HHD424020F7SV00.  Increase to 2secs when parallel probing
+	 * is in place.
+	 */
+	ATA_TMOUT_FF_WAIT	= 4 * 100 / 5,
+
+	BUS_UNKNOWN		= 0,
+	BUS_DMA			= 1,
+	BUS_IDLE		= 2,
+	BUS_NOINTR		= 3,
+	BUS_NODATA		= 4,
+	BUS_TIMER		= 5,
+	BUS_PIO			= 6,
+	BUS_EDD			= 7,
+	BUS_IDENTIFY		= 8,
+	BUS_PACKET		= 9,
+
+	PORT_UNKNOWN		= 0,
+	PORT_ENABLED		= 1,
+	PORT_DISABLED		= 2,
+
+	/* encoding various smaller bitmaps into a single
+	 * unsigned long bitmap
+	 */
+	ATA_NR_PIO_MODES	= 7,
+	ATA_NR_MWDMA_MODES	= 5,
+	ATA_NR_UDMA_MODES	= 8,
+
+	ATA_SHIFT_PIO		= 0,
+	ATA_SHIFT_MWDMA		= ATA_SHIFT_PIO + ATA_NR_PIO_MODES,
+	ATA_SHIFT_UDMA		= ATA_SHIFT_MWDMA + ATA_NR_MWDMA_MODES,
+
+	ATA_DMA_PAD_SZ		= 4,
+
+	ATA_ERING_SIZE		= 32,
+
+	ATA_DEFER_LINK		= 1,
+	ATA_DEFER_PORT		= 2,
+
+	ATA_EH_DESC_LEN		= 80,
+
+	ATA_EH_REVALIDATE	= (1 << 0),
+	ATA_EH_SOFTRESET	= (1 << 1),
+	ATA_EH_HARDRESET	= (1 << 2),
+	ATA_EH_ENABLE_LINK	= (1 << 3),
+	ATA_EH_LPM		= (1 << 4),
+
+	ATA_EH_RESET_MASK	= ATA_EH_SOFTRESET | ATA_EH_HARDRESET,
+	ATA_EH_PERDEV_MASK	= ATA_EH_REVALIDATE,
+
+	ATA_EHI_HOTPLUGGED	= (1 << 0),
+	ATA_EHI_RESUME_LINK	= (1 << 1),
+	ATA_EHI_NO_AUTOPSY	= (1 << 2),
+	ATA_EHI_QUIET		= (1 << 3),
+
+	ATA_EHI_DID_SOFTRESET	= (1 << 16),
+	ATA_EHI_DID_HARDRESET	= (1 << 17),
+	ATA_EHI_PRINTINFO	= (1 << 18),
+	ATA_EHI_SETMODE		= (1 << 19),
+	ATA_EHI_POST_SETMODE	= (1 << 20),
+
+	ATA_EHI_DID_RESET = ATA_EHI_DID_SOFTRESET | ATA_EHI_DID_HARDRESET,
+	ATA_EHI_RESET_MODIFIER_MASK = ATA_EHI_RESUME_LINK,
+
+	ATA_EH_MAX_TRIES	= 5,
+
+	ATA_PROBE_MAX_TRIES	= 3,
+	ATA_EH_DEV_TRIES	= 3,
+	ATA_EH_PMP_TRIES	= 5,
+	ATA_EH_PMP_LINK_TRIES	= 3,
+
+	SATA_PMP_SCR_TIMEOUT	= 250,
+
+	/* Horkage types. May be set by libata or controller on drives
+	(some horkage may be drive/controller pair dependant */
+
+	ATA_HORKAGE_DIAGNOSTIC	= (1 << 0),
+	ATA_HORKAGE_NODMA	= (1 << 1),
+	ATA_HORKAGE_NONCQ	= (1 << 2),
+	ATA_HORKAGE_MAX_SEC_128	= (1 << 3),
+	ATA_HORKAGE_BROKEN_HPA	= (1 << 4),
+	ATA_HORKAGE_SKIP_PM	= (1 << 5),
+	ATA_HORKAGE_HPA_SIZE	= (1 << 6),
+	ATA_HORKAGE_IPM		= (1 << 7),
+	ATA_HORKAGE_IVB		= (1 << 8),
+	ATA_HORKAGE_STUCK_ERR	= (1 << 9),
+
+	ATA_DMA_MASK_ATA	= (1 << 0),
+	ATA_DMA_MASK_ATAPI	= (1 << 1),
+	ATA_DMA_MASK_CFA	= (1 << 2),
+
+	ATAPI_READ		= 0,
+	ATAPI_WRITE		= 1,
+	ATAPI_READ_CD		= 2,
+	ATAPI_PASS_THRU		= 3,
+	ATAPI_MISC		= 4,
+};
+
+enum ata_completion_errors {
+	AC_ERR_DEV		= (1 << 0),
+	AC_ERR_HSM		= (1 << 1),
+	AC_ERR_TIMEOUT		= (1 << 2),
+	AC_ERR_MEDIA		= (1 << 3),
+	AC_ERR_ATA_BUS		= (1 << 4),
+	AC_ERR_HOST_BUS		= (1 << 5),
+	AC_ERR_SYSTEM		= (1 << 6),
+	AC_ERR_INVALID		= (1 << 7),
+	AC_ERR_OTHER		= (1 << 8),
+	AC_ERR_NODEV_HINT	= (1 << 9),
+	AC_ERR_NCQ		= (1 << 10),
+};
+
+enum ata_xfer_mask {
+	ATA_MASK_PIO	= ((1LU << ATA_NR_PIO_MODES) - 1) << ATA_SHIFT_PIO,
+	ATA_MASK_MWDMA	= ((1LU << ATA_NR_MWDMA_MODES) - 1) << ATA_SHIFT_MWDMA,
+	ATA_MASK_UDMA	= ((1LU << ATA_NR_UDMA_MODES) - 1) << ATA_SHIFT_UDMA,
+};
+
+struct ata_port_info {
+#ifndef __U_BOOT__
+	struct scsi_host_template	*sht;
+#endif
+	unsigned long			flags;
+	unsigned long			link_flags;
+	unsigned long			pio_mask;
+	unsigned long			mwdma_mask;
+	unsigned long			udma_mask;
+#ifndef __U_BOOT__
+	const struct ata_port_operations *port_ops;
+	void				*private_data;
+#endif
+};
+
+struct ata_ioports {
+	void __iomem		*cmd_addr;
+	void __iomem		*data_addr;
+	void __iomem		*error_addr;
+	void __iomem		*feature_addr;
+	void __iomem		*nsect_addr;
+	void __iomem		*lbal_addr;
+	void __iomem		*lbam_addr;
+	void __iomem		*lbah_addr;
+	void __iomem		*device_addr;
+	void __iomem		*status_addr;
+	void __iomem		*command_addr;
+	void __iomem		*altstatus_addr;
+	void __iomem		*ctl_addr;
+#ifndef __U_BOOT__
+	void __iomem		*bmdma_addr;
+#endif
+	void __iomem		*scr_addr;
+};
+
+struct ata_host {
+#ifndef __U_BOOT__
+	void __iomem * const	*iomap;
+	void			*private_data;
+	const struct ata_port_operations *ops;
+	unsigned long		flags;
+	struct ata_port		*simplex_claimed;
+#endif
+	unsigned int		n_ports;
+	struct ata_port		*ports[0];
+};
+
+#ifndef __U_BOOT__
+struct ata_port_stats {
+	unsigned long		unhandled_irq;
+	unsigned long		idle_irq;
+	unsigned long		rw_reqbuf;
+};
+#endif
+
+struct ata_device {
+	struct ata_link		*link;
+	unsigned int		devno;
+	unsigned long		flags;
+	unsigned int		horkage;
+#ifndef __U_BOOT__
+	struct scsi_device	*sdev;
+#ifdef CONFIG_ATA_ACPI
+	acpi_handle		acpi_handle;
+	union acpi_object	*gtf_cache;
+#endif
+#endif
+	u64			n_sectors;
+	unsigned int		class;
+
+	union {
+		u16		id[ATA_ID_WORDS];
+		u32		gscr[SATA_PMP_GSCR_DWORDS];
+	};
+#ifndef __U_BOOT__
+	u8			pio_mode;
+	u8			dma_mode;
+	u8			xfer_mode;
+	unsigned int		xfer_shift;
+#endif
+	unsigned int		multi_count;
+	unsigned int		max_sectors;
+	unsigned int		cdb_len;
+#ifndef __U_BOOT__
+	unsigned long		pio_mask;
+	unsigned long		mwdma_mask;
+#endif
+	unsigned long		udma_mask;
+	u16			cylinders;
+	u16			heads;
+	u16			sectors;
+#ifndef __U_BOOT__
+	int			spdn_cnt;
+#endif
+};
+
+enum dma_data_direction {
+	DMA_BIDIRECTIONAL = 0,
+	DMA_TO_DEVICE = 1,
+	DMA_FROM_DEVICE = 2,
+	DMA_NONE = 3,
+};
+
+struct ata_link {
+	struct ata_port		*ap;
+	int			pmp;
+	unsigned int		active_tag;
+	u32			sactive;
+	unsigned int		flags;
+	unsigned int		hw_sata_spd_limit;
+#ifndef __U_BOOT__
+	unsigned int		sata_spd_limit;
+	unsigned int		sata_spd;
+	struct ata_device	device[2];
+#endif
+};
+
+struct ata_port {
+	unsigned long		flags;
+	unsigned int		pflags;
+	unsigned int		print_id;
+	unsigned int		port_no;
+
+	struct ata_ioports	ioaddr;
+
+	u8			ctl;
+	u8			last_ctl;
+	unsigned int		pio_mask;
+	unsigned int		mwdma_mask;
+	unsigned int		udma_mask;
+	unsigned int		cbl;
+
+	struct ata_queued_cmd	qcmd[ATA_MAX_QUEUE];
+	unsigned long		qc_allocated;
+	unsigned int		qc_active;
+	int			nr_active_links;
+
+	struct ata_link		link;
+#ifndef __U_BOOT__
+	int			nr_pmp_links;
+	struct ata_link		*pmp_link;
+#endif
+	struct ata_link		*excl_link;
+	int			nr_pmp_links;
+#ifndef __U_BOOT__
+	struct ata_port_stats	stats;
+	struct device		*dev;
+	u32			msg_enable;
+#endif
+	struct ata_host		*host;
+	void			*port_task_data;
+
+	unsigned int		hsm_task_state;
+	void			*private_data;
+	unsigned char		*pdata;
+};
+
+#ifndef TRUE
+#define TRUE 1
+#endif
+#ifndef FALSE
+#define FALSE 0
+#endif
+
+#endif