/*
 * Copyright (C) 2008 Freescale Semiconductor, Inc.
 *		Dave Liu <daveliu@freescale.com>
 *
 * 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
 */

#include <common.h>
#include <command.h>
#include <asm/io.h>
#include <malloc.h>
#include <libata.h>
#include <fis.h>
#include "fsl_sata.h"

extern block_dev_desc_t sata_dev_desc[CFG_SATA_MAX_DEVICE];

#ifndef CFG_SATA1_FLAGS
	#define CFG_SATA1_FLAGS	FLAGS_DMA
#endif
#ifndef CFG_SATA2_FLAGS
	#define CFG_SATA2_FLAGS	FLAGS_DMA
#endif

static struct fsl_sata_info fsl_sata_info[] = {
#ifdef CONFIG_SATA1
	{CFG_SATA1, CFG_SATA1_FLAGS},
#else
	{0, 0},
#endif
#ifdef CONFIG_SATA2
	{CFG_SATA2, CFG_SATA2_FLAGS},
#else
	{0, 0},
#endif
};

static inline void mdelay(unsigned long msec)
{
	unsigned long i;
	for (i = 0; i < msec; i++)
		udelay(1000);
}

static inline void sdelay(unsigned long sec)
{
	unsigned long i;
	for (i = 0; i < sec; i++)
		mdelay(1000);
}

void dprint_buffer(unsigned char *buf, int len)
{
	int i, j;

	i = 0;
	j = 0;
	printf("\n\r");

	for (i = 0; i < len; i++) {
		printf("%02x ", *buf++);
		j++;
		if (j == 16) {
			printf("\n\r");
			j = 0;
		}
	}
	printf("\n\r");
}

static void fsl_sata_dump_sfis(struct sfis *s)
{
	printf("Status FIS dump:\n\r");
	printf("fis_type:		%02x\n\r", s->fis_type);
	printf("pm_port_i:		%02x\n\r", s->pm_port_i);
	printf("status:			%02x\n\r", s->status);
	printf("error:			%02x\n\r", s->error);
	printf("lba_low:		%02x\n\r", s->lba_low);
	printf("lba_mid:		%02x\n\r", s->lba_mid);
	printf("lba_high:		%02x\n\r", s->lba_high);
	printf("device:			%02x\n\r", s->device);
	printf("lba_low_exp:		%02x\n\r", s->lba_low_exp);
	printf("lba_mid_exp:		%02x\n\r", s->lba_mid_exp);
	printf("lba_high_exp:		%02x\n\r", s->lba_high_exp);
	printf("res1:			%02x\n\r", s->res1);
	printf("sector_count:		%02x\n\r", s->sector_count);
	printf("sector_count_exp:	%02x\n\r", s->sector_count_exp);
}

static int ata_wait_register(volatile unsigned *addr, u32 mask,
			 u32 val, u32 timeout_msec)
{
	int i;
	u32 temp;

	for (i = 0; (((temp = in_le32(addr)) & mask) != val)
			 && i < timeout_msec; i++)
		mdelay(1);
	return (i < timeout_msec) ? 0 : -1;
}

int init_sata(int dev)
{
	u32 length, align;
	cmd_hdr_tbl_t *cmd_hdr;
	u32 cda;
	u32 val32;
	fsl_sata_reg_t *reg;
	u32 sig;
	int i;
	fsl_sata_t *sata;

	if (dev < 0 || dev > (CFG_SATA_MAX_DEVICE - 1)) {
		printf("the sata index %d is out of ranges\n\r", dev);
		return -1;
	}

	/* Allocate SATA device driver struct */
	sata = (fsl_sata_t *)malloc(sizeof(fsl_sata_t));
	if (!sata) {
		printf("alloc the sata device struct failed\n\r");
		return -1;
	}
	/* Zero all of the device driver struct */
	memset((void *)sata, 0, sizeof(fsl_sata_t));

	/* Save the private struct to block device struct */
	sata_dev_desc[dev].priv = (void *)sata;

	sprintf(sata->name, "SATA%d", dev);

	/* Set the controller register base address to device struct */
	reg = (fsl_sata_reg_t *)(fsl_sata_info[dev].sata_reg_base);
	sata->reg_base = reg;

	/* Allocate the command header table, 4 bytes aligned */
	length = sizeof(struct cmd_hdr_tbl);
	align = SATA_HC_CMD_HDR_TBL_ALIGN;
	sata->cmd_hdr_tbl_offset = (void *)malloc(length + align);
	if (!sata) {
		printf("alloc the command header failed\n\r");
		return -1;
	}

	cmd_hdr = (cmd_hdr_tbl_t *)(((u32)sata->cmd_hdr_tbl_offset + align)
						& ~(align - 1));
	sata->cmd_hdr = cmd_hdr;

	/* Zero all of the command header table */
	memset((void *)sata->cmd_hdr_tbl_offset, 0, length + align);

	/* Allocate command descriptor for all command */
	length = sizeof(struct cmd_desc) * SATA_HC_MAX_CMD;
	align = SATA_HC_CMD_DESC_ALIGN;
	sata->cmd_desc_offset = (void *)malloc(length + align);
	if (!sata->cmd_desc_offset) {
		printf("alloc the command descriptor failed\n\r");
		return -1;
	}
	sata->cmd_desc = (cmd_desc_t *)(((u32)sata->cmd_desc_offset + align)
						& ~(align - 1));
	/* Zero all of command descriptor */
	memset((void *)sata->cmd_desc_offset, 0, length + align);

	/* Link the command descriptor to command header */
	for (i = 0; i < SATA_HC_MAX_CMD; i++) {
		cda = ((u32)sata->cmd_desc + SATA_HC_CMD_DESC_SIZE * i)
					 & ~(CMD_HDR_CDA_ALIGN - 1);
		cmd_hdr->cmd_slot[i].cda = cpu_to_le32(cda);
	}

	/* To have safe state, force the controller offline */
	val32 = in_le32(&reg->hcontrol);
	val32 &= ~HCONTROL_ONOFF;
	val32 |= HCONTROL_FORCE_OFFLINE;
	out_le32(&reg->hcontrol, val32);

	/* Wait the controller offline */
	ata_wait_register(&reg->hstatus, HSTATUS_ONOFF, 0, 1000);

	/* Set the command header base address to CHBA register to tell DMA */
	out_le32(&reg->chba, (u32)cmd_hdr & ~0x3);

	/* Snoop for the command header */
	val32 = in_le32(&reg->hcontrol);
	val32 |= HCONTROL_HDR_SNOOP;
	out_le32(&reg->hcontrol, val32);

	/* Disable all of interrupts */
	val32 = in_le32(&reg->hcontrol);
	val32 &= ~HCONTROL_INT_EN_ALL;
	out_le32(&reg->hcontrol, val32);

	/* Clear all of interrupts */
	val32 = in_le32(&reg->hstatus);
	out_le32(&reg->hstatus, val32);

	/* Set the ICC, no interrupt coalescing */
	out_le32(&reg->icc, 0x01000000);

	/* No PM attatched, the SATA device direct connect */
	out_le32(&reg->cqpmp, 0);

	/* Clear SError register */
	val32 = in_le32(&reg->serror);
	out_le32(&reg->serror, val32);

	/* Clear CER register */
	val32 = in_le32(&reg->cer);
	out_le32(&reg->cer, val32);

	/* Clear DER register */
	val32 = in_le32(&reg->der);
	out_le32(&reg->der, val32);

	/* No device detection or initialization action requested */
	out_le32(&reg->scontrol, 0x00000300);

	/* Configure the transport layer, default value */
	out_le32(&reg->transcfg, 0x08000016);

	/* Configure the link layer, default value */
	out_le32(&reg->linkcfg, 0x0000ff34);

	/* Bring the controller online */
	val32 = in_le32(&reg->hcontrol);
	val32 |= HCONTROL_ONOFF;
	out_le32(&reg->hcontrol, val32);

	mdelay(100);

	/* print sata device name */
	if (!dev)
		printf("%s ", sata->name);
	else
		printf("       %s ", sata->name);

	/* Check PHYRDY */
	val32 = in_le32(&reg->hstatus);
	if (val32 & HSTATUS_PHY_RDY) {
		sata->link = 1;
	} else {
		sata->link = 0;
		printf("(No RDY)\n\r");
		return -1;
	}

	if (val32 & HSTATUS_SIGNATURE) {
		sig = in_le32(&reg->sig);
		debug("Signature updated, the sig =%08x\n\r", sig);
		sata->ata_device_type = ata_dev_classify(sig);
	}

	/* Check the speed */
	val32 = in_le32(&reg->sstatus);
	if ((val32 & SSTATUS_SPD_MASK) == SSTATUS_SPD_GEN1)
		printf("(1.5 Gbps)\n\r");
	else if ((val32 & SSTATUS_SPD_MASK) == SSTATUS_SPD_GEN2)
		printf("(3 Gbps)\n\r");

	return 0;
}

/* Hardware reset, like Power-on and COMRESET */
void fsl_sata_hardware_reset(u32 reg_base)
{
	fsl_sata_reg_t *reg = (fsl_sata_reg_t *)reg_base;
	u32 scontrol;

	/* Disable the SATA interface and put PHY offline */
	scontrol = in_le32(&reg->scontrol);
	scontrol = (scontrol & 0x0f0) | 0x304;
	out_le32(&reg->scontrol, scontrol);

	/* No speed strict */
	scontrol = in_le32(&reg->scontrol);
	scontrol = scontrol & ~0x0f0;
	out_le32(&reg->scontrol, scontrol);

	/* Issue PHY wake/reset, Hardware_reset_asserted */
	scontrol = in_le32(&reg->scontrol);
	scontrol = (scontrol & 0x0f0) | 0x301;
	out_le32(&reg->scontrol, scontrol);

	mdelay(100);

	/* Resume PHY, COMRESET negated, the device initialize hardware
	 * and execute diagnostics, send good status-signature to host,
	 * which is D2H register FIS, and then the device enter idle state.
	 */
	scontrol = in_le32(&reg->scontrol);
	scontrol = (scontrol & 0x0f0) | 0x300;
	out_le32(&reg->scontrol, scontrol);

	mdelay(100);
	return;
}

static void fsl_sata_dump_regs(fsl_sata_reg_t *reg)
{
	printf("\n\rSATA:           %08x\n\r", (u32)reg);
	printf("CQR:            %08x\n\r", in_le32(&reg->cqr));
	printf("CAR:            %08x\n\r", in_le32(&reg->car));
	printf("CCR:            %08x\n\r", in_le32(&reg->ccr));
	printf("CER:            %08x\n\r", in_le32(&reg->cer));
	printf("CQR:            %08x\n\r", in_le32(&reg->cqr));
	printf("DER:            %08x\n\r", in_le32(&reg->der));
	printf("CHBA:           %08x\n\r", in_le32(&reg->chba));
	printf("HStatus:        %08x\n\r", in_le32(&reg->hstatus));
	printf("HControl:       %08x\n\r", in_le32(&reg->hcontrol));
	printf("CQPMP:          %08x\n\r", in_le32(&reg->cqpmp));
	printf("SIG:            %08x\n\r", in_le32(&reg->sig));
	printf("ICC:            %08x\n\r", in_le32(&reg->icc));
	printf("SStatus:        %08x\n\r", in_le32(&reg->sstatus));
	printf("SError:         %08x\n\r", in_le32(&reg->serror));
	printf("SControl:       %08x\n\r", in_le32(&reg->scontrol));
	printf("SNotification:  %08x\n\r", in_le32(&reg->snotification));
	printf("TransCfg:       %08x\n\r", in_le32(&reg->transcfg));
	printf("TransStatus:    %08x\n\r", in_le32(&reg->transstatus));
	printf("LinkCfg:        %08x\n\r", in_le32(&reg->linkcfg));
	printf("LinkCfg1:       %08x\n\r", in_le32(&reg->linkcfg1));
	printf("LinkCfg2:       %08x\n\r", in_le32(&reg->linkcfg2));
	printf("LinkStatus:     %08x\n\r", in_le32(&reg->linkstatus));
	printf("LinkStatus1:    %08x\n\r", in_le32(&reg->linkstatus1));
	printf("PhyCtrlCfg:     %08x\n\r", in_le32(&reg->phyctrlcfg));
	printf("SYSPR:          %08x\n\r", in_be32(&reg->syspr));
}

static int fsl_ata_exec_ata_cmd(struct fsl_sata *sata, struct cfis *cfis,
				int is_ncq, int tag, u8 *buffer, u32 len)
{
	cmd_hdr_entry_t *cmd_hdr;
	cmd_desc_t *cmd_desc;
	sata_fis_h2d_t *h2d;
	prd_entry_t *prde;
	u32 ext_c_ddc;
	u32 prde_count;
	u32 val32;
	u32 ttl;
	fsl_sata_reg_t *reg = sata->reg_base;
	int i;

	/* Check xfer length */
	if (len > SATA_HC_MAX_XFER_LEN) {
		printf("max transfer length is 64MB\n\r");
		return 0;
	}

	/* Setup the command descriptor */
	cmd_desc = sata->cmd_desc + tag;

	/* Get the pointer cfis of command descriptor */
	h2d = (sata_fis_h2d_t *)cmd_desc->cfis;

	/* Zero the cfis of command descriptor */
	memset((void *)h2d, 0, SATA_HC_CMD_DESC_CFIS_SIZE);

	/* Copy the cfis from user to command descriptor */
	h2d->fis_type = cfis->fis_type;
	h2d->pm_port_c = cfis->pm_port_c;
	h2d->command = cfis->command;

	h2d->features = cfis->features;
	h2d->features_exp = cfis->features_exp;

	h2d->lba_low = cfis->lba_low;
	h2d->lba_mid = cfis->lba_mid;
	h2d->lba_high = cfis->lba_high;
	h2d->lba_low_exp = cfis->lba_low_exp;
	h2d->lba_mid_exp = cfis->lba_mid_exp;
	h2d->lba_high_exp = cfis->lba_high_exp;

	if (!is_ncq) {
		h2d->sector_count = cfis->sector_count;
		h2d->sector_count_exp = cfis->sector_count_exp;
	} else { /* NCQ */
		h2d->sector_count = (u8)(tag << 3);
	}

	h2d->device = cfis->device;
	h2d->control = cfis->control;

	/* Setup the PRD table */
	prde = (prd_entry_t *)cmd_desc->prdt;
	memset((void *)prde, 0, sizeof(struct prdt));

	prde_count = 0;
	ttl = len;
	for (i = 0; i < SATA_HC_MAX_PRD_DIRECT; i++) {
		if (!len)
			break;
		prde->dba = cpu_to_le32((u32)buffer & ~0x3);
		debug("dba = %08x\n\r", (u32)buffer);

		if (len < PRD_ENTRY_MAX_XFER_SZ) {
			ext_c_ddc = PRD_ENTRY_DATA_SNOOP | len;
			debug("ext_c_ddc1 = %08x, len = %08x\n\r", ext_c_ddc, len);
			prde->ext_c_ddc = cpu_to_le32(ext_c_ddc);
			prde_count++;
			prde++;
			break;
		} else {
			ext_c_ddc = PRD_ENTRY_DATA_SNOOP; /* 4M bytes */
			debug("ext_c_ddc2 = %08x, len = %08x\n\r", ext_c_ddc, len);
			prde->ext_c_ddc = cpu_to_le32(ext_c_ddc);
			buffer += PRD_ENTRY_MAX_XFER_SZ;
			len -= PRD_ENTRY_MAX_XFER_SZ;
			prde_count++;
			prde++;
		}
	}

	/* Setup the command slot of cmd hdr */
	cmd_hdr = (cmd_hdr_entry_t *)&sata->cmd_hdr->cmd_slot[tag];

	cmd_hdr->cda = cpu_to_le32((u32)cmd_desc & ~0x3);

	val32 = prde_count << CMD_HDR_PRD_ENTRY_SHIFT;
	val32 |= sizeof(sata_fis_h2d_t);
	cmd_hdr->prde_fis_len = cpu_to_le32(val32);

	cmd_hdr->ttl = cpu_to_le32(ttl);

	if (!is_ncq) {
		val32 = CMD_HDR_ATTR_RES | CMD_HDR_ATTR_SNOOP;
	} else {
		val32 = CMD_HDR_ATTR_RES | CMD_HDR_ATTR_SNOOP | CMD_HDR_ATTR_FPDMA;
	}

	tag &= CMD_HDR_ATTR_TAG;
	val32 |= tag;

	debug("attribute = %08x\n\r", val32);
	cmd_hdr->attribute = cpu_to_le32(val32);

	/* Make sure cmd desc and cmd slot valid before commmand issue */
	sync();

	/* PMP*/
	val32 = (u32)(h2d->pm_port_c & 0x0f);
	out_le32(&reg->cqpmp, val32);

	/* Wait no active */
	if (ata_wait_register(&reg->car, (1 << tag), 0, 10000))
		printf("Wait no active time out\n\r");

	/* Issue command */
	if (!(in_le32(&reg->cqr) & (1 << tag))) {
		val32 = 1 << tag;
		out_le32(&reg->cqr, val32);
	}

	/* Wait command completed for 10s */
	if (ata_wait_register(&reg->ccr, (1 << tag), (1 << tag), 10000)) {
		if (!is_ncq)
			printf("Non-NCQ command time out\n\r");
		else
			printf("NCQ command time out\n\r");
	}

	val32 = in_le32(&reg->cer);

	if (val32) {
		u32 der;
		fsl_sata_dump_sfis((struct sfis *)cmd_desc->sfis);
		printf("CE at device\n\r");
		fsl_sata_dump_regs(reg);
		der = in_le32(&reg->der);
		out_le32(&reg->cer, val32);
		out_le32(&reg->der, der);
	}

	/* Clear complete flags */
	val32 = in_le32(&reg->ccr);
	out_le32(&reg->ccr, val32);

	return len;
}

static int fsl_ata_exec_reset_cmd(struct fsl_sata *sata, struct cfis *cfis,
				 int tag, u8 *buffer, u32 len)
{
	return 0;
}

static int fsl_sata_exec_cmd(struct fsl_sata *sata, struct cfis *cfis,
		 enum cmd_type command_type, int tag, u8 *buffer, u32 len)
{
	int rc;

	if (tag > SATA_HC_MAX_CMD || tag < 0) {
		printf("tag is out of range, tag=\n\r", tag);
		return -1;
	}

	switch (command_type) {
	case CMD_ATA:
		rc = fsl_ata_exec_ata_cmd(sata, cfis, 0, tag, buffer, len);
		return rc;
	case CMD_RESET:
		rc = fsl_ata_exec_reset_cmd(sata, cfis, tag, buffer, len);
		return rc;
	case CMD_NCQ:
		rc = fsl_ata_exec_ata_cmd(sata, cfis, 1, tag, buffer, len);
		return rc;
	case CMD_ATAPI:
	case CMD_VENDOR_BIST:
	case CMD_BIST:
		printf("not support now\n\r");
		return -1;
	default:
		break;
	}

	return -1;
}

static void fsl_sata_identify(int dev, u16 *id)
{
	fsl_sata_t *sata = (fsl_sata_t *)sata_dev_desc[dev].priv;
	struct sata_fis_h2d h2d;
	struct cfis *cfis;

	cfis = (struct cfis *)&h2d;
	memset((void *)cfis, 0, sizeof(struct cfis));

	cfis->fis_type = SATA_FIS_TYPE_REGISTER_H2D;
	cfis->pm_port_c = 0x80; /* is command */
	cfis->command = ATA_CMD_ID_ATA;

	fsl_sata_exec_cmd(sata, cfis, CMD_ATA, 0, (u8 *)id, ATA_ID_WORDS * 2);
	ata_swap_buf_le16(id, ATA_ID_WORDS);
}

static void fsl_sata_xfer_mode(int dev, u16 *id)
{
	fsl_sata_t *sata = (fsl_sata_t *)sata_dev_desc[dev].priv;

	sata->pio = id[ATA_ID_PIO_MODES];
	sata->mwdma = id[ATA_ID_MWDMA_MODES];
	sata->udma = id[ATA_ID_UDMA_MODES];
	debug("pio %04x, mwdma %04x, udma %04x\n\r", sata->pio, sata->mwdma, sata->udma);
}

static void fsl_sata_set_features(int dev)
{
	fsl_sata_t *sata = (fsl_sata_t *)sata_dev_desc[dev].priv;
	struct sata_fis_h2d h2d;
	struct cfis *cfis;
	u8 udma_cap;

	cfis = (struct cfis *)&h2d;
	memset((void *)cfis, 0, sizeof(struct cfis));

	cfis->fis_type = SATA_FIS_TYPE_REGISTER_H2D;
	cfis->pm_port_c = 0x80; /* is command */
	cfis->command = ATA_CMD_SET_FEATURES;
	cfis->features = SETFEATURES_XFER;

	/* First check the device capablity */
	udma_cap = (u8)(sata->udma & 0xff);
	debug("udma_cap %02x\n\r", udma_cap);

	if (udma_cap == ATA_UDMA6)
		cfis->sector_count = XFER_UDMA_6;
	if (udma_cap == ATA_UDMA5)
		cfis->sector_count = XFER_UDMA_5;
	if (udma_cap == ATA_UDMA4)
		cfis->sector_count = XFER_UDMA_4;
	if (udma_cap == ATA_UDMA3)
		cfis->sector_count = XFER_UDMA_3;

	fsl_sata_exec_cmd(sata, cfis, CMD_ATA, 0, NULL, 0);
}

static u32 fsl_sata_rw_cmd(int dev, u32 start, u32 blkcnt, u8 *buffer, int is_write)
{
	fsl_sata_t *sata = (fsl_sata_t *)sata_dev_desc[dev].priv;
	struct sata_fis_h2d h2d;
	struct cfis *cfis;
	u32 block;

	block = start;
	cfis = (struct cfis *)&h2d;

	memset((void *)cfis, 0, sizeof(struct cfis));

	cfis->fis_type = SATA_FIS_TYPE_REGISTER_H2D;
	cfis->pm_port_c = 0x80; /* is command */
	cfis->command = (is_write) ? ATA_CMD_WRITE_DMA : ATA_CMD_READ_DMA;
	cfis->device = ATA_LBA;

	cfis->device |= (block >> 24) & 0xf;
	cfis->lba_high = (block >> 16) & 0xff;
	cfis->lba_mid = (block >> 8) & 0xff;
	cfis->lba_low = block & 0xff;
	cfis->sector_count = (u8)(blkcnt & 0xff);

	fsl_sata_exec_cmd(sata, cfis, CMD_ATA, 0, buffer, ATA_SECT_SIZE * blkcnt);
	return blkcnt;
}

void fsl_sata_flush_cache(int dev)
{
	fsl_sata_t *sata = (fsl_sata_t *)sata_dev_desc[dev].priv;
	struct sata_fis_h2d h2d;
	struct cfis *cfis;

	cfis = (struct cfis *)&h2d;

	memset((void *)cfis, 0, sizeof(struct cfis));

	cfis->fis_type = SATA_FIS_TYPE_REGISTER_H2D;
	cfis->pm_port_c = 0x80; /* is command */
	cfis->command = ATA_CMD_FLUSH_CACHE;

	fsl_sata_exec_cmd(sata, cfis, CMD_ATA, 0, NULL, 0);
}

static u32 fsl_sata_rw_cmd_ext(int dev, u32 start, u32 blkcnt, u8 *buffer, int is_write)
{
	fsl_sata_t *sata = (fsl_sata_t *)sata_dev_desc[dev].priv;
	struct sata_fis_h2d h2d;
	struct cfis *cfis;
	u64 block;

	block = (u64)start;
	cfis = (struct cfis *)&h2d;

	memset((void *)cfis, 0, sizeof(struct cfis));

	cfis->fis_type = SATA_FIS_TYPE_REGISTER_H2D;
	cfis->pm_port_c = 0x80; /* is command */

	cfis->command = (is_write) ? ATA_CMD_WRITE_DMA_EXT
				 : ATA_CMD_READ_DMA_EXT;

	cfis->lba_high_exp = (block >> 40) & 0xff;
	cfis->lba_mid_exp = (block >> 32) & 0xff;
	cfis->lba_low_exp = (block >> 24) & 0xff;
	cfis->lba_high = (block >> 16) & 0xff;
	cfis->lba_mid = (block >> 8) & 0xff;
	cfis->lba_low = block & 0xff;
	cfis->device = ATA_LBA;
	cfis->sector_count_exp = (blkcnt >> 8) & 0xff;
	cfis->sector_count = blkcnt & 0xff;

	fsl_sata_exec_cmd(sata, cfis, CMD_ATA, 0, buffer, ATA_SECT_SIZE * blkcnt);
	return blkcnt;
}

u32 fsl_sata_rw_ncq_cmd(int dev, u32 start, u32 blkcnt, u8 *buffer, int is_write)
{
	fsl_sata_t *sata = (fsl_sata_t *)sata_dev_desc[dev].priv;
	struct sata_fis_h2d h2d;
	struct cfis *cfis;
	int ncq_channel;
	u64 block;

	if (sata_dev_desc[dev].lba48 != 1) {
		printf("execute FPDMA command on non-LBA48 hard disk\n\r");
		return -1;
	}

	block = (u64)start;
	cfis = (struct cfis *)&h2d;

	memset((void *)cfis, 0, sizeof(struct cfis));

	cfis->fis_type = SATA_FIS_TYPE_REGISTER_H2D;
	cfis->pm_port_c = 0x80; /* is command */

	cfis->command = (is_write) ? ATA_CMD_WRITE_FPDMA_QUEUED
				 : ATA_CMD_READ_FPDMA_QUEUED;

	cfis->lba_high_exp = (block >> 40) & 0xff;
	cfis->lba_mid_exp = (block >> 32) & 0xff;
	cfis->lba_low_exp = (block >> 24) & 0xff;
	cfis->lba_high = (block >> 16) & 0xff;
	cfis->lba_mid = (block >> 8) & 0xff;
	cfis->lba_low = block & 0xff;

	cfis->device = ATA_LBA;
	cfis->features_exp = (blkcnt >> 8) & 0xff;
	cfis->features = blkcnt & 0xff;

	if (sata->queue_depth >= SATA_HC_MAX_CMD)
		ncq_channel = SATA_HC_MAX_CMD - 1;
	else
		ncq_channel = sata->queue_depth - 1;

	/* Use the latest queue */
	fsl_sata_exec_cmd(sata, cfis, CMD_NCQ, ncq_channel, buffer, ATA_SECT_SIZE * blkcnt);
	return blkcnt;
}

void fsl_sata_flush_cache_ext(int dev)
{
	fsl_sata_t *sata = (fsl_sata_t *)sata_dev_desc[dev].priv;
	struct sata_fis_h2d h2d;
	struct cfis *cfis;

	cfis = (struct cfis *)&h2d;

	memset((void *)cfis, 0, sizeof(struct cfis));

	cfis->fis_type = SATA_FIS_TYPE_REGISTER_H2D;
	cfis->pm_port_c = 0x80; /* is command */
	cfis->command = ATA_CMD_FLUSH_CACHE_EXT;

	fsl_sata_exec_cmd(sata, cfis, CMD_ATA, 0, NULL, 0);
}

/* Software reset, set SRST of the Device Control register */
void fsl_sata_software_reset(int dev)
{
	return;
}

static void fsl_sata_init_wcache(int dev, u16 *id)
{
	fsl_sata_t *sata = (fsl_sata_t *)sata_dev_desc[dev].priv;

	if (ata_id_has_wcache(id) && ata_id_wcache_enabled(id))
		sata->wcache = 1;
	if (ata_id_has_flush(id))
		sata->flush = 1;
	if (ata_id_has_flush_ext(id))
		sata->flush_ext = 1;
}

static int fsl_sata_get_wcache(int dev)
{
	fsl_sata_t *sata = (fsl_sata_t *)sata_dev_desc[dev].priv;
	return sata->wcache;
}

static int fsl_sata_get_flush(int dev)
{
	fsl_sata_t *sata = (fsl_sata_t *)sata_dev_desc[dev].priv;
	return sata->flush;
}

static int fsl_sata_get_flush_ext(int dev)
{
	fsl_sata_t *sata = (fsl_sata_t *)sata_dev_desc[dev].priv;
	return sata->flush_ext;
}

u32 ata_low_level_rw_lba48(int dev, u32 blknr, u32 blkcnt, void *buffer, int is_write)
{
	u32 start, blks;
	u8 *addr;
	int max_blks;

	start = blknr;
	blks = blkcnt;
	addr = (u8 *)buffer;

	max_blks = ATA_MAX_SECTORS_LBA48;
	do {
		if (blks > max_blks) {
			if (fsl_sata_info[dev].flags != FLAGS_FPDMA)
				fsl_sata_rw_cmd_ext(dev, start, max_blks, addr, is_write);
			else
				fsl_sata_rw_ncq_cmd(dev, start, max_blks, addr, is_write);
			start += max_blks;
			blks -= max_blks;
			addr += ATA_SECT_SIZE * max_blks;
		} else {
			if (fsl_sata_info[dev].flags != FLAGS_FPDMA)
				fsl_sata_rw_cmd_ext(dev, start, blks, addr, is_write);
			else
				fsl_sata_rw_ncq_cmd(dev, start, blks, addr, is_write);
			start += blks;
			blks = 0;
			addr += ATA_SECT_SIZE * blks;
		}
	} while (blks != 0);

	return blkcnt;
}

u32 ata_low_level_rw_lba28(int dev, u32 blknr, u32 blkcnt, void *buffer, int is_write)
{
	u32 start, blks;
	u8 *addr;
	int max_blks;

	start = blknr;
	blks = blkcnt;
	addr = (u8 *)buffer;

	max_blks = ATA_MAX_SECTORS;
	do {
		if (blks > max_blks) {
			fsl_sata_rw_cmd(dev, start, max_blks, addr, is_write);
			start += max_blks;
			blks -= max_blks;
			addr += ATA_SECT_SIZE * max_blks;
		} else {
			fsl_sata_rw_cmd(dev, start, blks, addr, is_write);
			start += blks;
			blks = 0;
			addr += ATA_SECT_SIZE * blks;
		}
	} while (blks != 0);

	return blkcnt;
}

/*
 * SATA interface between low level driver and command layer
 */
ulong sata_read(int dev, u32 blknr, u32 blkcnt, void *buffer)
{
	u32 rc;

	if (sata_dev_desc[dev].lba48)
		rc = ata_low_level_rw_lba48(dev, blknr, blkcnt, buffer, READ_CMD);
	else
		rc = ata_low_level_rw_lba28(dev, blknr, blkcnt, buffer, READ_CMD);
	return rc;
}

ulong sata_write(int dev, u32 blknr, u32 blkcnt, void *buffer)
{
	u32 rc;

	if (sata_dev_desc[dev].lba48) {
		rc = ata_low_level_rw_lba48(dev, blknr, blkcnt, buffer, WRITE_CMD);
		if (fsl_sata_get_wcache(dev) && fsl_sata_get_flush_ext(dev))
			fsl_sata_flush_cache_ext(dev);
	} else {
		rc = ata_low_level_rw_lba28(dev, blknr, blkcnt, buffer, WRITE_CMD);
		if (fsl_sata_get_wcache(dev) && fsl_sata_get_flush(dev))
			fsl_sata_flush_cache(dev);
	}
	return rc;
}

int scan_sata(int dev)
{
	fsl_sata_t *sata = (fsl_sata_t *)sata_dev_desc[dev].priv;
	unsigned char serial[ATA_ID_SERNO_LEN + 1];
	unsigned char firmware[ATA_ID_FW_REV_LEN + 1];
	unsigned char product[ATA_ID_PROD_LEN + 1];
	u16 *id;
	u64 n_sectors;

	/* if no detected link */
	if (!sata->link)
		return -1;

	id = (u16 *)malloc(ATA_ID_WORDS * 2);
	if (!id) {
		printf("id malloc failed\n\r");
		return -1;
	}

	/* Identify device to get information */
	fsl_sata_identify(dev, id);

	/* Serial number */
	ata_id_c_string(id, serial, ATA_ID_SERNO, sizeof(serial));
	memcpy(sata_dev_desc[dev].product, serial, sizeof(serial));

	/* Firmware version */
	ata_id_c_string(id, firmware, ATA_ID_FW_REV, sizeof(firmware));
	memcpy(sata_dev_desc[dev].revision, firmware, sizeof(firmware));

	/* Product model */
	ata_id_c_string(id, product, ATA_ID_PROD, sizeof(product));
	memcpy(sata_dev_desc[dev].vendor, product, sizeof(product));

	/* Totoal sectors */
	n_sectors = ata_id_n_sectors(id);
	sata_dev_desc[dev].lba = (u32)n_sectors;

	/* Check if support LBA48 */
	if (ata_id_has_lba48(id)) {
		sata_dev_desc[dev].lba48 = 1;
		debug("Device support LBA48\n\r");
	}

	/* Get the NCQ queue depth from device */
	sata->queue_depth = ata_id_queue_depth(id);

	/* Get the xfer mode from device */
	fsl_sata_xfer_mode(dev, id);

	/* Get the write cache status from device */
	fsl_sata_init_wcache(dev, id);

	/* Set the xfer mode to highest speed */
	fsl_sata_set_features(dev);
#ifdef DEBUG
	fsl_sata_identify(dev, id);
	ata_dump_id(id);
#endif
	free((void *)id);
	return 0;
}