Add driver for S-ATA-controller on Intel processors with South

Bridge, ICH-5, ICH-6 and ICH-7. 

Implementation:

1. Code is divided in to two files. All functions, which are
   controller specific are kept in "drivers/ata_piix.c" file and
   functions, which are not controller specific, are kept in
   "common/cmd_sata.c" file.

2. Reading and Writing from the S-ATA drive is done using PIO method.

3. Driver can be configured for 48-bit addressing by defining macro
   CONFIG_LBA48, if this macro is not defined driver uses the 28-bit
   addressing.

4. S-ATA read function is hooked to the File system, commands like
   ext2ls and ext2load file can be used. This has been tested.

5. U-Boot command "SATA_init" is added, which initializes the S-ATA
   controller and identifies the S-ATA drives connected to it.

6. U-Boot command "sata" is added, which is used to read/write, print
   partition table and get info about the drives present. This I have
   implemented in same way as "ide" command is implemented in U-Boot.

7. This driver is for S-ATA in native mode.

8. This driver does not support the Native command queuing and
   Hot-plugging.

Signed-off-by: Mushtaq Khan <mushtaq_k@procsys.com>

7 files changed, 1106 insertions, 3 deletions

diff --git a/common/Makefile b/common/Makefile
index 5dfd3a8..1e4ce31 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -38,8 +38,8 @@ COBJS	= main.o ACEX1K.o altera.o bedbug.o circbuf.o cmd_autoscript.o \
 	  cmd_mem.o cmd_mii.o cmd_misc.o cmd_mmc.o \
 	  cmd_nand.o cmd_net.o cmd_nvedit.o \
 	  cmd_pci.o cmd_pcmcia.o cmd_portio.o \
-	  cmd_reginfo.o cmd_reiser.o cmd_scsi.o cmd_spi.o cmd_universe.o \
-	  cmd_usb.o cmd_vfd.o \
+	  cmd_reginfo.o cmd_reiser.o cmd_sata.o cmd_scsi.o cmd_spi.o \
+	  cmd_universe.o cmd_usb.o cmd_vfd.o \
 	  command.o console.o cyclon2.o devices.o dlmalloc.o docecc.o \
 	  environment.o env_common.o \
 	  env_nand.o env_dataflash.o env_flash.o env_eeprom.o \
diff --git a/common/cmd_sata.c b/common/cmd_sata.c
new file mode 100644
index 0000000..1c71b64
--- /dev/null
+++ b/common/cmd_sata.c
@@ -0,0 +1,710 @@
+/*
+  * Copyright (C) Procsys. All rights reserved.
+  * Author: Mushtaq Khan <mushtaq_k@procsys.com>
+                        <mushtaqk_921@yahoo.co.in>
+  *
+  *
+  * 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
+  *
+  * with the reference to libata in kernel 2.4.32
+  *
+*/
+
+/*File contains SATA read-write and other utility functions.*/
+#include <common.h>
+#include <asm/io.h>
+#include <pci.h>
+#include <command.h>
+#include <config.h>
+#include <ide.h>
+#include <ata.h>
+
+#ifdef CFG_SATA_SUPPORTED
+/*For debug prints set macro DEBUG_SATA to 1 */
+#define DEBUG_SATA 0
+/*Macro for SATA library specific declarations */
+#define SATA_DECL
+#include <sata.h>
+#undef SATA_DECL
+
+static u8 __inline__
+sata_inb (unsigned long ioaddr)
+{
+	return inb (ioaddr);
+}
+
+static void __inline__
+sata_outb (unsigned char val, unsigned long ioaddr)
+{
+	outb (val, ioaddr);
+}
+
+static void
+output_data (struct sata_ioports *ioaddr, ulong * sect_buf, int words)
+{
+	outsw (ioaddr->data_addr, sect_buf, words << 1);
+}
+
+static int
+input_data (struct sata_ioports *ioaddr, ulong * sect_buf, int words)
+{
+	insw (ioaddr->data_addr, sect_buf, words << 1);
+	return 0;
+}
+
+static void
+sata_cpy (unsigned char *dst, unsigned char *src, unsigned int len)
+{
+	unsigned char *end, *last;
+
+	last = dst;
+	end = src + len - 1;
+
+	/* reserve space for '\0' */
+	if (len < 2)
+		goto OUT;
+
+	/* skip leading white space */
+	while ((*src) && (src < end) && (*src == ' '))
+		++src;
+
+	/* copy string, omitting trailing white space */
+	while ((*src) && (src < end)) {
+		*dst++ = *src;
+		if (*src++ != ' ')
+			last = dst;
+	}
+      OUT:
+	*last = '\0';
+}
+
+int
+sata_bus_softreset (int num)
+{
+	u8 dev = 0, status = 0, i;
+
+	port[num].dev_mask = 0;
+
+	for (i = 0; i < CFG_SATA_DEVS_PER_BUS; i++) {
+		if (!(sata_devchk (&port[num].ioaddr, i))) {
+			PRINTF ("dev_chk failed for dev#%d\n", i);
+		} else {
+			port[num].dev_mask |= (1 << i);
+			PRINTF ("dev_chk passed for dev#%d\n", i);
+		}
+	}
+
+	if (!(port[num].dev_mask)) {
+		printf ("no devices on port%d\n", num);
+		return 1;
+	}
+
+	dev_select (&port[num].ioaddr, dev);
+
+	port[num].ctl_reg = 0x08;	/*Default value of control reg */
+	sata_outb (port[num].ctl_reg, port[num].ioaddr.ctl_addr);
+	udelay (10);
+	sata_outb (port[num].ctl_reg | ATA_SRST, port[num].ioaddr.ctl_addr);
+	udelay (10);
+	sata_outb (port[num].ctl_reg, port[num].ioaddr.ctl_addr);
+
+	/* spec mandates ">= 2ms" before checking status.
+	 * We wait 150ms, because that was the magic delay used for
+	 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
+	 * between when the ATA command register is written, and then
+	 * status is checked.  Because waiting for "a while" before
+	 * checking status is fine, post SRST, we perform this magic
+	 * delay here as well.
+	 */
+	msleep (150);
+	status = sata_busy_wait (&port[num].ioaddr, ATA_BUSY, 300);
+	while ((status & ATA_BUSY)) {
+		msleep (100);
+		status = sata_busy_wait (&port[num].ioaddr, ATA_BUSY, 3);
+	}
+
+	if (status & ATA_BUSY)
+		printf ("ata%u is slow to respond,plz be patient\n", port);
+
+	while ((status & ATA_BUSY)) {
+		msleep (100);
+		status = sata_chk_status (&port[num].ioaddr);
+	}
+
+	if (status & ATA_BUSY) {
+		printf ("ata%u failed to respond : ", port);
+		printf ("bus reset failed\n");
+		return 1;
+	}
+	return 0;
+}
+
+void
+sata_identify (int num, int dev)
+{
+	u8 cmd = 0, status = 0, devno = num * CFG_SATA_DEVS_PER_BUS + dev;
+	u16 iobuf[ATA_SECT_SIZE];
+	u64 n_sectors = 0;
+	u8 mask = 0;
+
+	memset (iobuf, 0, sizeof (iobuf));
+	hd_driveid_t *iop = (hd_driveid_t *) iobuf;
+
+	if (dev == 0)
+		mask = 0x01;
+	else
+		mask = 0x02;
+
+	if (!(port[num].dev_mask & mask)) {
+		printf ("dev%d is not present on port#%d\n", dev, num);
+		return;
+	}
+
+	printf ("port=%d dev=%d\n", num, dev);
+
+	dev_select (&port[num].ioaddr, dev);
+
+	status = 0;
+	cmd = ATA_CMD_IDENT;	/*Device Identify Command */
+	sata_outb (cmd, port[num].ioaddr.command_addr);
+	sata_inb (port[num].ioaddr.altstatus_addr);
+	udelay (10);
+
+	status = sata_busy_wait (&port[num].ioaddr, ATA_BUSY, 1000);
+	if (status & ATA_ERR) {
+		printf ("\ndevice not responding\n");
+		port[num].dev_mask &= ~mask;
+		return;
+	}
+
+	input_data (&port[num].ioaddr, (ulong *) iobuf, ATA_SECTORWORDS);
+
+	PRINTF ("\nata%u: dev %u cfg 49:%04x 82:%04x 83:%04x 84:%04x85:%04x"
+		"86:%04x" "87:%04x 88:%04x\n", num, dev, iobuf[49],
+		iobuf[82], iobuf[83], iobuf[84], iobuf[85], iobuf[86],
+		iobuf[87], iobuf[88]);
+
+	/* we require LBA and DMA support (bits 8 & 9 of word 49) */
+	if (!ata_id_has_dma (iobuf) || !ata_id_has_lba (iobuf)) {
+		PRINTF ("ata%u: no dma/lba\n", num);
+	}
+	ata_dump_id (iobuf);
+
+	if (ata_id_has_lba48 (iobuf)) {
+		n_sectors = ata_id_u64 (iobuf, 100);
+	} else {
+		n_sectors = ata_id_u32 (iobuf, 60);
+	}
+	PRINTF ("no. of sectors %u\n", ata_id_u64 (iobuf, 100));
+	PRINTF ("no. of sectors %u\n", ata_id_u32 (iobuf, 60));
+
+	if (n_sectors == 0) {
+		port[num].dev_mask &= ~mask;
+		return;
+	}
+
+	sata_cpy (sata_dev_desc[devno].revision, iop->fw_rev,
+		  sizeof (sata_dev_desc[devno].revision));
+	sata_cpy (sata_dev_desc[devno].vendor, iop->model,
+		  sizeof (sata_dev_desc[devno].vendor));
+	sata_cpy (sata_dev_desc[devno].product, iop->serial_no,
+		  sizeof (sata_dev_desc[devno].product));
+	strswab (sata_dev_desc[devno].revision);
+	strswab (sata_dev_desc[devno].vendor);
+
+	if ((iop->config & 0x0080) == 0x0080) {
+		sata_dev_desc[devno].removable = 1;
+	} else {
+		sata_dev_desc[devno].removable = 0;
+	}
+
+	sata_dev_desc[devno].lba = iop->lba_capacity;
+	PRINTF ("lba=0x%x", sata_dev_desc[devno].lba);
+
+#ifdef CONFIG_LBA48
+	if (iop->command_set_2 & 0x0400) {
+		sata_dev_desc[devno].lba48 = 1;
+		lba = (unsigned long long) iop->lba48_capacity[0] |
+		    ((unsigned long long) iop->lba48_capacity[1] << 16) |
+		    ((unsigned long long) iop->lba48_capacity[2] << 32) |
+		    ((unsigned long long) iop->lba48_capacity[3] << 48);
+	} else {
+		sata_dev_desc[devno].lba48 = 0;
+	}
+#endif
+
+	/* assuming HD */
+	sata_dev_desc[devno].type = DEV_TYPE_HARDDISK;
+	sata_dev_desc[devno].blksz = ATA_BLOCKSIZE;
+	sata_dev_desc[devno].lun = 0;	/* just to fill something in... */
+}
+
+void
+set_Feature_cmd (int num, int dev)
+{
+	u8 mask = 0x00, status = 0;
+
+	if (dev == 0)
+		mask = 0x01;
+	else
+		mask = 0x02;
+
+	if (!(port[num].dev_mask & mask)) {
+		PRINTF ("dev%d is not present on port#%d\n", dev, num);
+		return;
+	}
+
+	dev_select (&port[num].ioaddr, dev);
+
+	sata_outb (SETFEATURES_XFER, port[num].ioaddr.feature_addr);
+	sata_outb (XFER_PIO_4, port[num].ioaddr.nsect_addr);
+	sata_outb (0, port[num].ioaddr.lbal_addr);
+	sata_outb (0, port[num].ioaddr.lbam_addr);
+	sata_outb (0, port[num].ioaddr.lbah_addr);
+
+	sata_outb (ATA_DEVICE_OBS, port[num].ioaddr.device_addr);
+	sata_outb (ATA_CMD_SETF, port[num].ioaddr.command_addr);
+
+	udelay (50);
+	msleep (150);
+
+	status = sata_busy_wait (&port[num].ioaddr, ATA_BUSY, 5000);
+	if ((status & (ATA_STAT_BUSY | ATA_STAT_ERR))) {
+		printf ("Error  : status 0x%02x\n", status);
+		port[num].dev_mask &= ~mask;
+	}
+}
+
+void
+sata_port (struct sata_ioports *ioport)
+{
+	ioport->data_addr = ioport->cmd_addr + ATA_REG_DATA;
+	ioport->error_addr = ioport->cmd_addr + ATA_REG_ERR;
+	ioport->feature_addr = ioport->cmd_addr + ATA_REG_FEATURE;
+	ioport->nsect_addr = ioport->cmd_addr + ATA_REG_NSECT;
+	ioport->lbal_addr = ioport->cmd_addr + ATA_REG_LBAL;
+	ioport->lbam_addr = ioport->cmd_addr + ATA_REG_LBAM;
+	ioport->lbah_addr = ioport->cmd_addr + ATA_REG_LBAH;
+	ioport->device_addr = ioport->cmd_addr + ATA_REG_DEVICE;
+	ioport->status_addr = ioport->cmd_addr + ATA_REG_STATUS;
+	ioport->command_addr = ioport->cmd_addr + ATA_REG_CMD;
+}
+
+int
+sata_devchk (struct sata_ioports *ioaddr, int dev)
+{
+	u8 nsect, lbal;
+
+	dev_select (ioaddr, dev);
+
+	sata_outb (0x55, ioaddr->nsect_addr);
+	sata_outb (0xaa, ioaddr->lbal_addr);
+
+	sata_outb (0xaa, ioaddr->nsect_addr);
+	sata_outb (0x55, ioaddr->lbal_addr);
+
+	sata_outb (0x55, ioaddr->nsect_addr);
+	sata_outb (0xaa, ioaddr->lbal_addr);
+
+	nsect = sata_inb (ioaddr->nsect_addr);
+	lbal = sata_inb (ioaddr->lbal_addr);
+
+	if ((nsect == 0x55) && (lbal == 0xaa))
+		return 1;	/* we found a device */
+	else
+		return 0;	/* nothing found */
+}
+
+void
+dev_select (struct sata_ioports *ioaddr, int dev)
+{
+	u8 tmp = 0;
+
+	if (dev == 0)
+		tmp = ATA_DEVICE_OBS;
+	else
+		tmp = ATA_DEVICE_OBS | ATA_DEV1;
+
+	sata_outb (tmp, ioaddr->device_addr);
+	sata_inb (ioaddr->altstatus_addr);
+	udelay (5);
+}
+
+u8
+sata_busy_wait (struct sata_ioports *ioaddr, int bits, unsigned int max)
+{
+	u8 status;
+
+	do {
+		udelay (1000);
+		status = sata_chk_status (ioaddr);
+		max--;
+	} while ((status & bits) && (max > 0));
+
+	return status;
+}
+
+u8
+sata_chk_status (struct sata_ioports * ioaddr)
+{
+	return sata_inb (ioaddr->status_addr);
+}
+
+void
+msleep (int count)
+{
+	int i;
+
+	for (i = 0; i < count; i++)
+		udelay (1000);
+}
+
+ulong
+sata_read (int device, lbaint_t blknr, ulong blkcnt, ulong * buffer)
+{
+	ulong n = 0;
+	u8 dev = 0, num = 0, mask = 0, status = 0;
+
+#ifdef CONFIG_LBA48
+	unsigned char lba48 = 0;
+
+	if (blknr & 0x0000fffff0000000) {
+		if (!sata_dev_desc[devno].lba48) {
+			printf ("Drive doesn't support 48-bit addressing\n");
+			return 0;
+		}
+		/* more than 28 bits used, use 48bit mode */
+		lba48 = 1;
+	}
+#endif
+	/*Port Number */
+	num = device / CFG_SATA_DEVS_PER_BUS;
+	/*dev on the port */
+	if (device >= CFG_SATA_DEVS_PER_BUS)
+		dev = device - CFG_SATA_DEVS_PER_BUS;
+	else
+		dev = device;
+
+	if (dev == 0)
+		mask = 0x01;
+	else
+		mask = 0x02;
+
+	if (!(port[num].dev_mask & mask)) {
+		printf ("dev%d is not present on port#%d\n", dev, num);
+		return 0;
+	}
+
+	/* Select device */
+	dev_select (&port[num].ioaddr, dev);
+
+	status = sata_busy_wait (&port[num].ioaddr, ATA_BUSY, 500);
+	if (status & ATA_BUSY) {
+		printf ("ata%u failed to respond\n", port[num].port_no);
+		return n;
+	}
+	while (blkcnt-- > 0) {
+		status = sata_busy_wait (&port[num].ioaddr, ATA_BUSY, 500);
+		if (status & ATA_BUSY) {
+			printf ("ata%u failed to respond\n", 0);
+			return n;
+		}
+#ifdef CONFIG_LBA48
+		if (lba48) {
+			/* write high bits */
+			sata_outb (0, port[num].ioaddr.nsect_addr);
+			sata_outb ((blknr >> 24) & 0xFF,
+				   port[num].ioaddr.lbal_addr);
+			sata_outb ((blknr >> 32) & 0xFF,
+				   port[num].ioaddr.lbam_addr);
+			sata_outb ((blknr >> 40) & 0xFF,
+				   port[num].ioaddr.lbah_addr);
+		}
+#endif
+		sata_outb (1, port[num].ioaddr.nsect_addr);
+		sata_outb (((blknr) >> 0) & 0xFF,
+			   port[num].ioaddr.lbal_addr);
+		sata_outb ((blknr >> 8) & 0xFF, port[num].ioaddr.lbam_addr);
+		sata_outb ((blknr >> 16) & 0xFF, port[num].ioaddr.lbah_addr);
+
+#ifdef CONFIG_LBA48
+		if (lba48) {
+			sata_outb (ATA_LBA, port[num].ioaddr.device_addr);
+			sata_outb (ATA_CMD_READ_EXT,
+				   port[num].ioaddr.command_addr);
+		} else
+#endif
+		{
+			sata_outb (ATA_LBA | ((blknr >> 24) & 0xF),
+				   port[num].ioaddr.device_addr);
+			sata_outb (ATA_CMD_READ,
+				   port[num].ioaddr.command_addr);
+		}
+
+		msleep (50);
+		/*may take up to 4 sec */
+		status = sata_busy_wait (&port[num].ioaddr, ATA_BUSY, 4000);
+
+		if ((status & (ATA_STAT_DRQ | ATA_STAT_BUSY | ATA_STAT_ERR))
+		    != ATA_STAT_DRQ) {
+			u8 err = 0;
+
+			printf ("Error no DRQ dev %d blk %ld: sts 0x%02x\n",
+				device, (ulong) blknr, status);
+			err = sata_inb (port[num].ioaddr.error_addr);
+			printf ("Error reg = 0x%x\n", err);
+			return (n);
+		}
+		input_data (&port[num].ioaddr, buffer, ATA_SECTORWORDS);
+		sata_inb (port[num].ioaddr.altstatus_addr);
+		udelay (50);
+
+		++n;
+		++blknr;
+		buffer += ATA_SECTORWORDS;
+	}
+	return n;
+}
+
+ulong
+sata_write (int device, lbaint_t blknr, ulong blkcnt, ulong * buffer)
+{
+	ulong n = 0;
+	unsigned char status = 0, num = 0, dev = 0, mask = 0;
+
+#ifdef CONFIG_LBA48
+	unsigned char lba48 = 0;
+
+	if (blknr & 0x0000fffff0000000) {
+		if (!sata_dev_desc[devno].lba48) {
+			printf ("Drive doesn't support 48-bit addressing\n");
+			return 0;
+		}
+		/* more than 28 bits used, use 48bit mode */
+		lba48 = 1;
+	}
+#endif
+	/*Port Number */
+	num = device / CFG_SATA_DEVS_PER_BUS;
+	/*dev on the Port */
+	if (device >= CFG_SATA_DEVS_PER_BUS)
+		dev = device - CFG_SATA_DEVS_PER_BUS;
+	else
+		dev = device;
+
+	if (dev == 0)
+		mask = 0x01;
+	else
+		mask = 0x02;
+
+	/* Select device */
+	dev_select (&port[num].ioaddr, dev);
+
+	status = sata_busy_wait (&port[num].ioaddr, ATA_BUSY, 500);
+	if (status & ATA_BUSY) {
+		printf ("ata%u failed to respond\n", port[num].port_no);
+		return n;
+	}
+
+	while (blkcnt-- > 0) {
+		status = sata_busy_wait (&port[num].ioaddr, ATA_BUSY, 500);
+		if (status & ATA_BUSY) {
+			printf ("ata%u failed to respond\n",
+				port[num].port_no);
+			return n;
+		}
+#ifdef CONFIG_LBA48
+		if (lba48) {
+			/* write high bits */
+			sata_outb (0, port[num].ioaddr.nsect_addr);
+			sata_outb ((blknr >> 24) & 0xFF,
+				   port[num].ioaddr.lbal_addr);
+			sata_outb ((blknr >> 32) & 0xFF,
+				   port[num].ioaddr.lbam_addr);
+			sata_outb ((blknr >> 40) & 0xFF,
+				   port[num].ioaddr.lbah_addr);
+		}
+#endif
+		sata_outb (1, port[num].ioaddr.nsect_addr);
+		sata_outb ((blknr >> 0) & 0xFF, port[num].ioaddr.lbal_addr);
+		sata_outb ((blknr >> 8) & 0xFF, port[num].ioaddr.lbam_addr);
+		sata_outb ((blknr >> 16) & 0xFF, port[num].ioaddr.lbah_addr);
+#ifdef CONFIG_LBA48
+		if (lba48) {
+			sata_outb (ATA_LBA, port[num].ioaddr.device_addr);
+			sata_outb (ATA_CMD_WRITE_EXT,
+				   port[num].ioaddr.command_addr);
+		} else
+#endif
+		{
+			sata_outb (ATA_LBA | ((blknr >> 24) & 0xF),
+				   port[num].ioaddr.device_addr);
+			sata_outb (ATA_CMD_WRITE,
+				   port[num].ioaddr.command_addr);
+		}
+
+		msleep (50);
+		/*may take up to 4 sec */
+		status = sata_busy_wait (&port[num].ioaddr, ATA_BUSY, 4000);
+		if ((status & (ATA_STAT_DRQ | ATA_STAT_BUSY | ATA_STAT_ERR))
+		    != ATA_STAT_DRQ) {
+			printf ("Error no DRQ dev %d blk %ld: sts 0x%02x\n",
+				device, (ulong) blknr, status);
+			return (n);
+		}
+
+		output_data (&port[num].ioaddr, buffer, ATA_SECTORWORDS);
+		sata_inb (port[num].ioaddr.altstatus_addr);
+		udelay (50);
+
+		++n;
+		++blknr;
+		buffer += ATA_SECTORWORDS;
+	}
+	return n;
+}
+
+block_dev_desc_t *sata_get_dev (int dev);
+
+block_dev_desc_t *
+sata_get_dev (int dev)
+{
+	return ((block_dev_desc_t *) & sata_dev_desc[dev]);
+}
+
+int
+do_sata (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+{
+
+	switch (argc) {
+	case 0:
+	case 1:
+		printf ("Usage:\n%s\n", cmdtp->usage);
+		return 1;
+	case 2:
+		if (strncmp (argv[1], "init", 4) == 0) {
+			int rcode = 0;
+
+			rcode = init_sata ();
+			if (rcode)
+				printf ("Sata initialization Failed\n");
+			return rcode;
+		} else if (strncmp (argv[1], "inf", 3) == 0) {
+			int i;
+
+			putc ('\n');
+			for (i = 0; i < CFG_SATA_MAXDEVICES; ++i) {
+				/*List only known devices */
+				if (sata_dev_desc[i].type ==
+				    DEV_TYPE_UNKNOWN)
+					continue;
+				printf ("sata dev %d: ", i);
+				dev_print (&sata_dev_desc[i]);
+			}
+			return 0;
+		}
+		printf ("Usage:\n%s\n", cmdtp->usage);
+		return 1;
+	case 3:
+		if (strcmp (argv[1], "dev") == 0) {
+			int dev = (int) simple_strtoul (argv[2], NULL, 10);
+
+			if (dev >= CFG_SATA_MAXDEVICES) {
+				printf ("\nSata dev %d not available\n",
+					dev);
+				return 1;
+			}
+			printf ("\nSATA dev %d: ", dev);
+			dev_print (&sata_dev_desc[dev]);
+			if (sata_dev_desc[dev].type == DEV_TYPE_UNKNOWN)
+				return 1;
+			curr_dev = dev;
+			return 0;
+		} else if (strcmp (argv[1], "part") == 0) {
+			int dev = (int) simple_strtoul (argv[2], NULL, 10);
+
+			if (dev >= CFG_SATA_MAXDEVICES) {
+				printf ("\nSata dev %d not available\n",
+					dev);
+				return 1;
+			}
+			PRINTF ("\nSATA dev %d: ", dev);
+			if (sata_dev_desc[dev].part_type !=
+			    PART_TYPE_UNKNOWN) {
+				print_part (&sata_dev_desc[dev]);
+			} else {
+				printf ("\nSata dev %d partition type "
+					"unknown\n", dev);
+				return 1;
+			}
+			return 0;
+		}
+		printf ("Usage:\n%s\n", cmdtp->usage);
+		return 1;
+	default:
+		if (argc < 5) {
+			printf ("Usage:\n%s\n", cmdtp->usage);
+			return 1;
+		}
+		if (strcmp (argv[1], "read") == 0) {
+			ulong addr = simple_strtoul (argv[2], NULL, 16);
+			ulong cnt = simple_strtoul (argv[4], NULL, 16);
+			ulong n;
+			lbaint_t blk = simple_strtoul (argv[3], NULL, 16);
+
+			memset ((int *) addr, 0, cnt * 512);
+			printf ("\nSATA read: dev %d blk # %ld,"
+				"count %ld ... ", curr_dev, blk, cnt);
+			n = sata_read (curr_dev, blk, cnt, (ulong *) addr);
+			/* flush cache after read */
+			flush_cache (addr, cnt * 512);
+			printf ("%ld blocks read: %s\n", n,
+				(n == cnt) ? "OK" : "ERR");
+			if (n == cnt)
+				return 1;
+			else
+				return 0;
+		} else if (strcmp (argv[1], "write") == 0) {
+			ulong addr = simple_strtoul (argv[2], NULL, 16);
+			ulong cnt = simple_strtoul (argv[4], NULL, 16);
+			ulong n;
+			lbaint_t blk = simple_strtoul (argv[3], NULL, 16);
+
+			printf ("\nSata write: dev %d blk # %ld,"
+				"count %ld ... ", curr_dev, blk, cnt);
+			n = sata_write (curr_dev, blk, cnt, (ulong *) addr);
+			printf ("%ld blocks written: %s\n", n,
+				(n == cnt) ? "OK" : "ERR");
+			if (n == cnt)
+				return 1;
+			else
+				return 0;
+		} else {
+			printf ("Usage:\n%s\n", cmdtp->usage);
+			return 1;
+		}
+	}			/*End OF SWITCH */
+}
+
+U_BOOT_CMD (sata, 5, 1, do_sata,
+	    "sata init\n"
+	    "sata info\n"
+	    "sata part device\n"
+	    "sata dev device\n"
+	    "sata read  addr blk# cnt\n"
+	    "sata write  addr blk# cnt\n", "cmd for init,rw and dev-info\n");
+
+#endif
diff --git a/drivers/Makefile b/drivers/Makefile
index d68cba6..8ad530f 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -27,7 +27,7 @@ include $(TOPDIR)/config.mk
 
 LIB	= $(obj)libdrivers.a
 
-COBJS	= 3c589.o 5701rls.o ali512x.o atmel_usart.o \
+COBJS	= 3c589.o 5701rls.o ali512x.o ata_piix.o atmel_usart.o \
 	  bcm570x.o bcm570x_autoneg.o cfb_console.o cfi_flash.o \
 	  cs8900.o ct69000.o dataflash.o dc2114x.o dm9000x.o \
 	  e1000.o eepro100.o \
diff --git a/drivers/ata_piix.c b/drivers/ata_piix.c
new file mode 100644
index 0000000..7e61163
--- /dev/null
+++ b/drivers/ata_piix.c
@@ -0,0 +1,216 @@
+/*
+  * Copyright (C) Procsys. All rights reserved.
+  * Author: Mushtaq Khan <mushtaq_k@procsys.com>
+                        <mushtaqk_921@yahoo.co.in>
+  *
+  * 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
+  *
+  * with the reference to ata_piix driver in kernel 2.4.32
+*/
+
+/*
+This file contains SATA controller and SATA drive initialization functions
+*/
+
+#include <common.h>
+#include <pci.h>
+#include <command.h>
+#include <config.h>
+#include <asm/byteorder.h>
+#include <ide.h>
+#include <ata.h>
+
+#ifdef CFG_ATA_PIIX		/*ata_piix driver */
+
+#define DEBUG_SATA 0		/*For debug prints set DEBUG_SATA to 1 */
+
+#define DRV_DECL		/*For file specific declarations */
+#include <sata.h>
+#undef DRV_DECL
+
+/*Macros realted to PCI*/
+#define PCI_SATA_BUS	0x00
+#define PCI_SATA_DEV	0x1f
+#define PCI_SATA_FUNC	0x02
+
+#define PCI_SATA_BASE1 0x10
+#define PCI_SATA_BASE2 0x14
+#define PCI_SATA_BASE3 0x18
+#define PCI_SATA_BASE4 0x1c
+#define PCI_SATA_BASE5 0x20
+#define PCI_PMR         0x90
+#define PCI_PI          0x09
+#define PCI_PCS         0x92
+#define PCI_DMA_CTL     0x48
+
+#define PORT_PRESENT (1<<0)
+#define PORT_ENABLED (1<<4)
+
+u32 bdf;
+u32 iobase1 = 0;		/*Primary cmd block */
+u32 iobase2 = 0;		/*Primary ctl block */
+u32 iobase3 = 0;		/*Sec cmd block */
+u32 iobase4 = 0;		/*sec ctl block */
+u32 iobase5 = 0;		/*BMDMA*/
+int
+pci_sata_init (void)
+{
+	u32 bus = PCI_SATA_BUS;
+	u32 dev = PCI_SATA_DEV;
+	u32 fun = PCI_SATA_FUNC;
+	u16 cmd = 0;
+	u8 lat = 0, pcibios_max_latency = 0xff;
+	u8 pmr;			/*Port mapping reg */
+	u8 pi;			/*Prgming Interface reg */
+
+	bdf = PCI_BDF (bus, dev, fun);
+	pci_read_config_dword (bdf, PCI_SATA_BASE1, &iobase1);
+	pci_read_config_dword (bdf, PCI_SATA_BASE2, &iobase2);
+	pci_read_config_dword (bdf, PCI_SATA_BASE3, &iobase3);
+	pci_read_config_dword (bdf, PCI_SATA_BASE4, &iobase4);
+	pci_read_config_dword (bdf, PCI_SATA_BASE5, &iobase5);
+
+	if ((iobase1 == 0xFFFFFFFF) || (iobase2 == 0xFFFFFFFF) ||
+	    (iobase3 == 0xFFFFFFFF) || (iobase4 == 0xFFFFFFFF) ||
+	    (iobase5 == 0xFFFFFFFF)) {
+		printf ("error no base addr for SATA controller\n");
+		return 1;
+	 /*ERROR*/}
+
+	iobase1 &= 0xFFFFFFFE;
+	iobase2 &= 0xFFFFFFFE;
+	iobase3 &= 0xFFFFFFFE;
+	iobase4 &= 0xFFFFFFFE;
+	iobase5 &= 0xFFFFFFFE;
+
+	/*check for mode */
+	pci_read_config_byte (bdf, PCI_PMR, &pmr);
+	if (pmr > 1) {
+		printf ("combined mode not supported\n");
+		return 1;
+	}
+
+	pci_read_config_byte (bdf, PCI_PI, &pi);
+	if ((pi & 0x05) != 0x05) {
+		printf ("Sata is in Legacy mode\n");
+		return 1;
+	} else {
+		printf ("sata is in Native mode\n");
+	}
+
+	/*MASTER CFG AND IO CFG */
+	pci_read_config_word (bdf, PCI_COMMAND, &cmd);
+	cmd |= PCI_COMMAND_MASTER | PCI_COMMAND_IO;
+	pci_write_config_word (bdf, PCI_COMMAND, cmd);
+	pci_read_config_byte (dev, PCI_LATENCY_TIMER, &lat);
+
+	if (lat < 16)
+		lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;
+	else if (lat > pcibios_max_latency)
+		lat = pcibios_max_latency;
+	pci_write_config_byte (dev, PCI_LATENCY_TIMER, lat);
+
+	return 0;
+}
+
+int
+sata_bus_probe (int port_no)
+{
+	int orig_mask, mask;
+	u16 pcs;
+
+	mask = (PORT_PRESENT << port_no);
+	pci_read_config_word (bdf, PCI_PCS, &pcs);
+	orig_mask = (int) pcs & 0xff;
+	if ((orig_mask & mask) != mask)
+		return 0;
+	else
+		return 1;
+}
+
+int
+init_sata (void)
+{
+	u8 i, rv = 0;
+
+	for (i = 0; i < CFG_SATA_MAXDEVICES; i++) {
+		sata_dev_desc[i].type = DEV_TYPE_UNKNOWN;
+		sata_dev_desc[i].if_type = IF_TYPE_IDE;
+		sata_dev_desc[i].dev = i;
+		sata_dev_desc[i].part_type = PART_TYPE_UNKNOWN;
+		sata_dev_desc[i].blksz = 0;
+		sata_dev_desc[i].lba = 0;
+		sata_dev_desc[i].block_read = sata_read;
+	}
+
+	rv = pci_sata_init ();
+	if (rv == 1) {
+		printf ("pci initialization failed\n");
+		return 1;
+	}
+
+	port[0].port_no = 0;
+	port[0].ioaddr.cmd_addr = iobase1;
+	port[0].ioaddr.altstatus_addr = port[0].ioaddr.ctl_addr =
+	    iobase2 | ATA_PCI_CTL_OFS;
+	port[0].ioaddr.bmdma_addr = iobase5;
+
+	port[1].port_no = 1;
+	port[1].ioaddr.cmd_addr = iobase3;
+	port[1].ioaddr.altstatus_addr = port[1].ioaddr.ctl_addr =
+	    iobase4 | ATA_PCI_CTL_OFS;
+	port[1].ioaddr.bmdma_addr = iobase5 + 0x8;
+
+	for (i = 0; i < CFG_SATA_MAXBUS; i++)
+		sata_port (&port[i].ioaddr);
+
+	for (i = 0; i < CFG_SATA_MAXBUS; i++) {
+		if (!(sata_bus_probe (i))) {
+			port[i].port_state = 0;
+			printf ("SATA#%d port is not present \n", i);
+		} else {
+			printf ("SATA#%d port is present\n", i);
+			if (sata_bus_softreset (i)) {
+				port[i].port_state = 0;
+			} else {
+				port[i].port_state = 1;
+			}
+		}
+	}
+
+	for (i = 0; i < CFG_SATA_MAXBUS; i++) {
+		u8 j, devno;
+
+		if (port[i].port_state == 0)
+			continue;
+		for (j = 0; j < CFG_SATA_DEVS_PER_BUS; j++) {
+			sata_identify (i, j);
+			set_Feature_cmd (i, j);
+			devno = i * CFG_SATA_DEVS_PER_BUS + j;
+			if ((sata_dev_desc[devno].lba > 0) &&
+			    (sata_dev_desc[devno].blksz > 0)) {
+				dev_print (&sata_dev_desc[devno]);
+				/* initialize partition type */
+				init_part (&sata_dev_desc[devno]);
+				if (curr_dev < 0)
+					curr_dev =
+					    i * CFG_SATA_DEVS_PER_BUS + j;
+			}
+		}
+	}
+	return 0;
+}
+#endif
diff --git a/include/ata.h b/include/ata.h
index 8584226..d36bdf6 100644
--- a/include/ata.h
+++ b/include/ata.h
@@ -83,6 +83,66 @@
 #define ATA_DEVICE(x)	((x & 1)<<4)
 #define ATA_LBA		0xE0
 
+enum {
+	ATA_MAX_DEVICES = 1,	/* per bus/port */
+	ATA_MAX_PRD = 256,	/* we could make these 256/256 */
+	ATA_SECT_SIZE = 256,	/*256 words per sector */
+
+	/* bits in ATA command block registers */
+	ATA_HOB = (1 << 7),	/* LBA48 selector */
+	ATA_NIEN = (1 << 1),	/* disable-irq flag */
+	/*ATA_LBA                 = (1 << 6), *//* LBA28 selector */
+	ATA_DEV1 = (1 << 4),	/* Select Device 1 (slave) */
+	ATA_DEVICE_OBS = (1 << 7) | (1 << 5),	/* obs bits in dev reg */
+	ATA_DEVCTL_OBS = (1 << 3),	/* obsolete bit in devctl reg */
+	ATA_BUSY = (1 << 7),	/* BSY status bit */
+	ATA_DRDY = (1 << 6),	/* device ready */
+	ATA_DF = (1 << 5),	/* device fault */
+	ATA_DRQ = (1 << 3),	/* data request i/o */
+	ATA_ERR = (1 << 0),	/* have an error */
+	ATA_SRST = (1 << 2),	/* software reset */
+	ATA_ABORTED = (1 << 2),	/* command aborted */
+	/* ATA command block registers */
+	ATA_REG_DATA = 0x00,
+	ATA_REG_ERR = 0x01,
+	ATA_REG_NSECT = 0x02,
+	ATA_REG_LBAL = 0x03,
+	ATA_REG_LBAM = 0x04,
+	ATA_REG_LBAH = 0x05,
+	ATA_REG_DEVICE = 0x06,
+	ATA_REG_STATUS = 0x07,
+	ATA_PCI_CTL_OFS = 0x02,
+	/* and their aliases */
+	ATA_REG_FEATURE = ATA_REG_ERR,
+	ATA_REG_CMD = ATA_REG_STATUS,
+	ATA_REG_BYTEL = ATA_REG_LBAM,
+	ATA_REG_BYTEH = ATA_REG_LBAH,
+	ATA_REG_DEVSEL = ATA_REG_DEVICE,
+	ATA_REG_IRQ = ATA_REG_NSECT,
+
+	/* SETFEATURES stuff */
+	SETFEATURES_XFER = 0x03,
+	XFER_UDMA_7 = 0x47,
+	XFER_UDMA_6 = 0x46,
+	XFER_UDMA_5 = 0x45,
+	XFER_UDMA_4 = 0x44,
+	XFER_UDMA_3 = 0x43,
+	XFER_UDMA_2 = 0x42,
+	XFER_UDMA_1 = 0x41,
+	XFER_UDMA_0 = 0x40,
+	XFER_MW_DMA_2 = 0x22,
+	XFER_MW_DMA_1 = 0x21,
+	XFER_MW_DMA_0 = 0x20,
+	XFER_PIO_4 = 0x0C,
+	XFER_PIO_3 = 0x0B,
+	XFER_PIO_2 = 0x0A,
+	XFER_PIO_1 = 0x09,
+	XFER_PIO_0 = 0x08,
+	XFER_SW_DMA_2 = 0x12,
+	XFER_SW_DMA_1 = 0x11,
+	XFER_SW_DMA_0 = 0x10,
+	XFER_PIO_SLOW = 0x00
+};
 /*
  * ATA Commands (only mandatory commands listed here)
  */
diff --git a/include/configs/sc520_cdp.h b/include/configs/sc520_cdp.h
index d7d07a6..8b2ec07 100644
--- a/include/configs/sc520_cdp.h
+++ b/include/configs/sc520_cdp.h
@@ -182,6 +182,15 @@
 #undef  CONFIG_IDE_RESET_ROUTINE	/* no special reset function */
 
 /************************************************************
+*SATA/Native Stuff
+************************************************************/
+#define CFG_SATA_SUPPORTED      1
+#define CFG_SATA_MAXBUS         2       /*Max Sata buses supported */
+#define CFG_SATA_DEVS_PER_BUS   2      /*Max no. of devices per bus/port */
+#define CFG_SATA_MAXDEVICES     (CFG_SATA_MAXBUS* CFG_SATA_DEVS_PER_BUS)
+#define CFG_ATA_PIIX            1       /*Supports ata_piix driver */
+
+/************************************************************
  * ATAPI support (experimental)
  ************************************************************/
 #define CONFIG_ATAPI			/* enable ATAPI Support */
diff --git a/include/sata.h b/include/sata.h
new file mode 100644
index 0000000..c6fa2ab
--- /dev/null
+++ b/include/sata.h
@@ -0,0 +1,108 @@
+
+#if (DEBUG_SATA)
+#define PRINTF(fmt,args...)	printf (fmt ,##args)
+#else
+#define PRINTF(fmt,args...)
+#endif
+
+struct sata_ioports {
+	unsigned long cmd_addr;
+	unsigned long data_addr;
+	unsigned long error_addr;
+	unsigned long feature_addr;
+	unsigned long nsect_addr;
+	unsigned long lbal_addr;
+	unsigned long lbam_addr;
+	unsigned long lbah_addr;
+	unsigned long device_addr;
+	unsigned long status_addr;
+	unsigned long command_addr;
+	unsigned long altstatus_addr;
+	unsigned long ctl_addr;
+	unsigned long bmdma_addr;
+	unsigned long scr_addr;
+};
+
+struct sata_port {
+	unsigned char port_no;	/*primary-0, secondary=1 */
+	struct sata_ioports ioaddr;	/*ATA cmd/ctl/dma reg blks */
+	unsigned char ctl_reg;
+	unsigned char last_ctl;
+	unsigned char port_state;	/*1-port is present and 
+					   0-port is not available */
+	unsigned char dev_mask;
+};
+
+/***********SATA LIBRARY SPECIFIC DEFINITIONS AND DECLARATIONS**************/
+#ifdef SATA_DECL		/*SATA library specific declarations */
+#define ata_id_has_lba48(id)    ((id)[83] & (1 << 10))
+#define ata_id_has_lba(id)      ((id)[49] & (1 << 9))
+#define ata_id_has_dma(id)      ((id)[49] & (1 << 8))
+#define ata_id_u32(id,n)        \
+	(((u32) (id)[(n) + 1] << 16) | ((u32) (id)[(n)]))
+#define ata_id_u64(id,n)        \
+	(((u64) (id)[(n) + 3] << 48) | \
+	((u64) (id)[(n) + 2] << 32) | \
+	((u64) (id)[(n) + 1] << 16) | \
+	((u64) (id)[(n) + 0]) )
+#endif
+
+#ifdef SATA_DECL		/*SATA library specific declarations */
+static inline void
+ata_dump_id (u16 * id)
+{
+	PRINTF ("49==0x%04x  "
+		"53==0x%04x  "
+		"63==0x%04x  "
+		"64==0x%04x  "
+		"75==0x%04x  \n", id[49], id[53], id[63], id[64], id[75]);
+	PRINTF ("80==0x%04x  "
+		"81==0x%04x  "
+		"82==0x%04x  "
+		"83==0x%04x  "
+		"84==0x%04x  \n", id[80], id[81], id[82], id[83], id[84]);
+	PRINTF ("88==0x%04x  " "93==0x%04x\n", id[88], id[93]);
+}
+#endif
+
+#ifdef SATA_DECL		/*SATA library specific declarations */
+int sata_bus_softreset (int num);
+void sata_identify (int num, int dev);
+void sata_port (struct sata_ioports *ioport);
+void set_Feature_cmd (int num, int dev);
+int sata_devchk (struct sata_ioports *ioaddr, int dev);
+void dev_select (struct sata_ioports *ioaddr, int dev);
+u8 sata_busy_wait (struct sata_ioports *ioaddr, int bits, unsigned int max);
+u8 sata_chk_status (struct sata_ioports *ioaddr);
+ulong sata_read (int device, lbaint_t blknr, ulong blkcnt, ulong * buffer);
+ulong sata_write (int device, lbaint_t blknr, ulong blkcnt, ulong * buffer);
+void msleep (int count);
+#else
+extern int sata_bus_softreset (int num);
+extern void sata_identify (int num, int dev);
+extern void sata_port (struct sata_ioports *ioport);
+extern void set_Feature_cmd (int num, int dev);
+extern ulong sata_read (int device, lbaint_t blknr,
+			ulong blkcnt, ulong * buffer);
+extern ulong sata_write (int device, lbaint_t blknr,
+			 ulong blkcnt, ulong * buffer);
+extern void msleep (int count);
+#endif
+
+/************DRIVER SPECIFIC DEFINITIONS AND DECLARATIONS**************/
+
+#ifdef DRV_DECL			/*Driver specific declaration */
+int init_sata (void);
+#else
+extern int init_sata (void);
+#endif
+
+#ifdef DRV_DECL			/*Defines Driver Specific variables */
+struct sata_port port[CFG_SATA_MAXBUS];
+block_dev_desc_t sata_dev_desc[CFG_SATA_MAXDEVICES];
+int curr_dev = -1;
+#else
+extern struct sata_port port[CFG_SATA_MAXBUS];
+extern block_dev_desc_t sata_dev_desc[CFG_SATA_MAXDEVICES];
+extern int curr_dev;
+#endif