Add AHCI support to u-boot

Add AHCI support in u-boot, enable the sata disk controllers which
following the AHCI protocol.

Signed-off-by:Jason Jin<jason.jin@freescale.com>

2 files changed, 707 insertions, 1 deletions

diff --git a/drivers/Makefile b/drivers/Makefile
index e6176ed..98c4ef9 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -44,7 +44,7 @@ OBJS	= 3c589.o 5701rls.o ali512x.o \
 	  serial.o serial_max3100.o \
 	  serial_pl010.o serial_pl011.o serial_xuartlite.o \
 	  sl811_usb.o sm501.o smc91111.o smiLynxEM.o \
-	  status_led.o sym53c8xx.o \
+	  status_led.o sym53c8xx.o ahci.o \
 	  ti_pci1410a.o tigon3.o tsec.o \
 	  usbdcore.o usbdcore_ep0.o usbdcore_omap1510.o usbtty.o \
 	  videomodes.o w83c553f.o \
diff --git a/drivers/ahci.c b/drivers/ahci.c
new file mode 100644
index 0000000..828498d
--- /dev/null
+++ b/drivers/ahci.c
@@ -0,0 +1,706 @@
+/*
+ * Copyright (C) Freescale Semiconductor, Inc. 2006. All rights reserved.
+ * Author: Jason Jin<Jason.jin@freescale.com>
+ *         Zhang Wei<wei.zhang@freescale.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 on libata and ahci drvier in kernel
+ *
+ */
+#include <common.h>
+
+#ifdef CONFIG_SCSI_AHCI
+
+#include <command.h>
+#include <pci.h>
+#include <asm/processor.h>
+#include <asm/errno.h>
+#include <asm/io.h>
+#include <malloc.h>
+#include <scsi.h>
+#include <ata.h>
+#include <linux/ctype.h>
+#include <ahci.h>
+
+struct ahci_probe_ent *probe_ent = NULL;
+hd_driveid_t *ataid[AHCI_MAX_PORTS];
+
+#define writel_with_flush(a,b)	do{writel(a,b);readl(b);}while(0)
+
+static inline u32 ahci_port_base(u32 base, u32 port)
+{
+	return base + 0x100 + (port * 0x80);
+}
+
+
+static void ahci_setup_port(struct ahci_ioports *port, unsigned long base,
+			    unsigned int port_idx)
+{
+	base = ahci_port_base(base, port_idx);
+
+	port->cmd_addr	= base;
+	port->scr_addr	= base + PORT_SCR;
+}
+
+
+#define msleep(a) udelay(a * 1000)
+#define ssleep(a) msleep(a * 1000)
+static int waiting_for_cmd_completed(volatile u8 *offset, int timeout_msec, u32 sign)
+{
+	int i;
+	u32 status;
+	for(i = 0; ((status = readl(offset)) & sign) && i < timeout_msec; i++)
+		msleep(1);
+
+	return (i < timeout_msec)? 0 : -1;
+}
+
+
+static int ahci_host_init(struct ahci_probe_ent *probe_ent)
+{
+	pci_dev_t pdev = probe_ent->dev;
+	volatile u8 *mmio = (volatile u8 *)probe_ent->mmio_base;
+	u32 tmp, cap_save;
+	u16 tmp16;
+	int i, j;
+	volatile u8* port_mmio;
+	unsigned short vendor;
+
+	cap_save = readl(mmio + HOST_CAP);
+	cap_save &= ( (1<<28) | (1<<17) );
+	cap_save |= (1 << 27);
+
+	/* global controller reset */
+	tmp = readl(mmio + HOST_CTL);
+	if ((tmp & HOST_RESET) == 0)
+		writel_with_flush(tmp | HOST_RESET, mmio + HOST_CTL);
+
+	/* reset must complete within 1 second, or
+	 * the hardware should be considered fried.
+	 */
+	ssleep(1);
+
+	tmp = readl(mmio + HOST_CTL);
+	if (tmp & HOST_RESET) {
+		debug("controller reset failed (0x%x)\n", tmp);
+		return -1;
+	}
+
+	writel_with_flush(HOST_AHCI_EN, mmio + HOST_CTL);
+	writel(cap_save, mmio + HOST_CAP);
+	writel_with_flush(0xf, mmio + HOST_PORTS_IMPL);
+
+	pci_read_config_word(pdev, PCI_VENDOR_ID, &vendor);
+
+	if (vendor == PCI_VENDOR_ID_INTEL) {
+		u16 tmp16;
+		pci_read_config_word(pdev, 0x92, &tmp16);
+		tmp16 |= 0xf;
+		pci_write_config_word(pdev, 0x92, tmp16);
+	}
+
+	probe_ent->cap = readl(mmio + HOST_CAP);
+	probe_ent->port_map = readl(mmio + HOST_PORTS_IMPL);
+	probe_ent->n_ports = (probe_ent->cap & 0x1f) + 1;
+
+	debug("cap 0x%x  port_map 0x%x  n_ports %d\n",
+		probe_ent->cap, probe_ent->port_map, probe_ent->n_ports);
+
+	for (i = 0; i < probe_ent->n_ports; i++) {
+		probe_ent->port[i].port_mmio = ahci_port_base((u32)mmio, i);
+		port_mmio = (u8 *)probe_ent->port[i].port_mmio;
+		ahci_setup_port(&probe_ent->port[i],
+				(unsigned long) mmio, i);
+
+		/* make sure port is not active */
+		tmp = readl(port_mmio + PORT_CMD);
+		if (tmp & (PORT_CMD_LIST_ON | PORT_CMD_FIS_ON |
+			   PORT_CMD_FIS_RX | PORT_CMD_START)) {
+			tmp &= ~(PORT_CMD_LIST_ON | PORT_CMD_FIS_ON |
+				 PORT_CMD_FIS_RX | PORT_CMD_START);
+			writel_with_flush(tmp, port_mmio + PORT_CMD);
+
+			/* spec says 500 msecs for each bit, so
+			 * this is slightly incorrect.
+			 */
+			msleep(500);
+		}
+
+		writel(PORT_CMD_SPIN_UP, port_mmio + PORT_CMD);
+
+		j = 0;
+		while (j < 100) {
+			msleep(10);
+			tmp = readl(port_mmio + PORT_SCR_STAT);
+			if ((tmp & 0xf) == 0x3)
+				break;
+			j++;
+		}
+
+		tmp = readl(port_mmio + PORT_SCR_ERR);
+		debug("PORT_SCR_ERR 0x%x\n", tmp);
+		writel(tmp, port_mmio + PORT_SCR_ERR);
+
+		/* ack any pending irq events for this port */
+		tmp = readl(port_mmio + PORT_IRQ_STAT);
+		debug("PORT_IRQ_STAT 0x%x\n", tmp);
+		if (tmp)
+			writel(tmp, port_mmio + PORT_IRQ_STAT);
+
+		writel(1 << i, mmio + HOST_IRQ_STAT);
+
+		/* set irq mask (enables interrupts) */
+		writel(DEF_PORT_IRQ, port_mmio + PORT_IRQ_MASK);
+
+		/*register linkup ports*/
+		tmp = readl(port_mmio + PORT_SCR_STAT);
+		debug("Port %d status: 0x%x\n",i,tmp);
+		if((tmp & 0xf) == 0x03)
+			probe_ent->link_port_map |= (0x01<< i);
+	}
+
+	tmp = readl(mmio + HOST_CTL);
+	debug("HOST_CTL 0x%x\n", tmp);
+	writel(tmp | HOST_IRQ_EN, mmio + HOST_CTL);
+	tmp = readl(mmio + HOST_CTL);
+	debug("HOST_CTL 0x%x\n", tmp);
+
+	pci_read_config_word(pdev, PCI_COMMAND, &tmp16);
+	tmp |= PCI_COMMAND_MASTER;
+	pci_write_config_word(pdev, PCI_COMMAND, tmp16);
+
+	return 0;
+}
+
+
+static void ahci_print_info(struct ahci_probe_ent *probe_ent)
+{
+	pci_dev_t pdev = probe_ent->dev;
+	volatile u8* mmio = (volatile u8 *)probe_ent->mmio_base;
+	u32 vers, cap, impl, speed;
+	const char *speed_s;
+	u16 cc;
+	const char *scc_s;
+
+	vers = readl(mmio + HOST_VERSION);
+	cap = probe_ent->cap;
+	impl = probe_ent->port_map;
+
+	speed = (cap >> 20) & 0xf;
+	if (speed == 1)
+		speed_s = "1.5";
+	else if (speed == 2)
+		speed_s = "3";
+	else
+		speed_s = "?";
+
+	pci_read_config_word(pdev, 0x0a, &cc);
+	if (cc == 0x0101)
+		scc_s = "IDE";
+	else if (cc == 0x0106)
+		scc_s = "SATA";
+	else if (cc == 0x0104)
+		scc_s = "RAID";
+	else
+		scc_s = "unknown";
+
+	printf(	"AHCI %02x%02x.%02x%02x "
+		"%u slots %u ports %s Gbps 0x%x impl %s mode\n"
+	       	,
+
+	       	(vers >> 24) & 0xff,
+	       	(vers >> 16) & 0xff,
+	       	(vers >> 8) & 0xff,
+	       	vers & 0xff,
+
+		((cap >> 8) & 0x1f) + 1,
+		(cap & 0x1f) + 1,
+		speed_s,
+		impl,
+		scc_s);
+
+	printf("flags: "
+	       	"%s%s%s%s%s%s"
+	       	"%s%s%s%s%s%s%s\n"
+	       	,
+
+		cap & (1 << 31) ? "64bit " : "",
+		cap & (1 << 30) ? "ncq " : "",
+		cap & (1 << 28) ? "ilck " : "",
+		cap & (1 << 27) ? "stag " : "",
+		cap & (1 << 26) ? "pm " : "",
+		cap & (1 << 25) ? "led " : "",
+
+		cap & (1 << 24) ? "clo " : "",
+		cap & (1 << 19) ? "nz " : "",
+		cap & (1 << 18) ? "only " : "",
+		cap & (1 << 17) ? "pmp " : "",
+		cap & (1 << 15) ? "pio " : "",
+		cap & (1 << 14) ? "slum " : "",
+		cap & (1 << 13) ? "part " : ""
+		);
+}
+
+
+static int ahci_init_one (pci_dev_t pdev)
+{
+	u32 iobase, vendor;
+	int rc;
+
+	memset((void *)ataid, 0,  sizeof(hd_driveid_t *) * AHCI_MAX_PORTS);
+
+	probe_ent = malloc(sizeof(probe_ent));
+	memset(probe_ent, 0, sizeof(probe_ent));
+	probe_ent->dev = pdev;
+
+	pci_read_config_dword(pdev, AHCI_PCI_BAR, &iobase);
+	iobase &= ~0xf;
+
+	probe_ent->host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY
+				  | ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA
+				  | ATA_FLAG_NO_ATAPI;
+	probe_ent->pio_mask	= 0x1f;
+	probe_ent->udma_mask	= 0x7f; /*Fixme,assume to support UDMA6*/
+
+	probe_ent->mmio_base	= iobase;
+
+	/* Take from kernel:
+	 * JMicron-specific fixup:
+	 * make sure we're in AHCI mode
+	 */
+	pci_read_config_word(pdev, PCI_VENDOR_ID, &vendor);
+	if(vendor ==  0x197b)
+		pci_write_config_byte(pdev, 0x41, 0xa1);
+
+	/* initialize adapter */
+	rc = ahci_host_init(probe_ent);
+	if (rc)
+		goto err_out;
+
+	ahci_print_info(probe_ent);
+
+	return 0;
+
+err_out:
+	return rc;
+}
+
+
+#define MAX_DATA_BYTE_COUNT  (4*1024*1024)
+static int ahci_fill_sg(u8 port, unsigned char *buf, int buf_len)
+{
+
+	struct ahci_ioports *pp = &(probe_ent->port[port]);
+	struct ahci_sg *ahci_sg = pp->cmd_tbl_sg;
+	u32 sg_count;
+	int i;
+
+	sg_count = ((buf_len - 1) / MAX_DATA_BYTE_COUNT) + 1;
+	if(sg_count > AHCI_MAX_SG){
+		printf("Error:Too much sg!\n");
+		return -1;
+	}
+
+	for(i = 0;i < sg_count; i++)
+	{
+		ahci_sg->addr = cpu_to_le32((u32)buf + i * MAX_DATA_BYTE_COUNT);
+		ahci_sg->addr_hi = 0;
+		ahci_sg->flags_size = cpu_to_le32( 0x3fffff &
+				(buf_len < MAX_DATA_BYTE_COUNT
+				? (buf_len - 1)
+				: (MAX_DATA_BYTE_COUNT - 1)));
+		ahci_sg++;
+		buf_len -= MAX_DATA_BYTE_COUNT;
+	}
+
+	return sg_count;
+}
+
+
+static void ahci_fill_cmd_slot(struct ahci_ioports *pp, u32 opts)
+{
+	pp->cmd_slot->opts = cpu_to_le32(opts);
+	pp->cmd_slot->status = 0;
+	pp->cmd_slot->tbl_addr = cpu_to_le32(pp->cmd_tbl & 0xffffffff);
+	pp->cmd_slot->tbl_addr_hi = 0;
+}
+
+
+static void ahci_set_feature(u8 port)
+{
+
+	struct ahci_ioports *pp = &(probe_ent->port[port]);
+	volatile u8* port_mmio = (volatile u8 *)pp->port_mmio;
+	u32 cmd_fis_len = 5; /* five dwords */
+	u8 fis[20];
+
+	/*set feature*/
+	memset(fis,0,20);
+	fis[0] = 0x27;
+	fis[1] = 1 << 7;
+	fis[2] = ATA_CMD_SETF;
+	fis[3] = SETFEATURES_XFER;
+	fis[12] = __ilog2(probe_ent->udma_mask + 1) + 0x40 - 0x01;
+
+	memcpy((unsigned char *)pp->cmd_tbl,fis,20);
+	ahci_fill_cmd_slot(pp, cmd_fis_len);
+	writel(1, port_mmio + PORT_CMD_ISSUE);
+	readl(port_mmio + PORT_CMD_ISSUE);
+
+	if(waiting_for_cmd_completed(port_mmio + PORT_CMD_ISSUE, 150, 0x1)) {
+		printf("set feature error!\n");
+	}
+}
+
+
+static int ahci_port_start(u8 port)
+{
+
+	struct ahci_ioports *pp = &(probe_ent->port[port]);
+	volatile u8* port_mmio = (volatile u8 *)pp->port_mmio;
+	u32 port_status;
+	u32 mem;
+
+	debug("Enter start port: %d\n",port);
+	port_status = readl(port_mmio + PORT_SCR_STAT);
+	debug("Port %d status: %x\n",port,port_status);
+	if((port_status & 0xf) != 0x03){
+		printf("No Link on this port!\n");
+		return -1;
+	}
+
+	mem = (u32)malloc(AHCI_PORT_PRIV_DMA_SZ + 2048);
+	if (!mem) {
+		free(pp);
+		printf("No mem for table!\n");
+		return -ENOMEM;
+	}
+
+	mem = (mem + 0x800) & (~0x7ff); /* Aligned to 2048-bytes */
+
+	memset((u8 *)mem, 0, AHCI_PORT_PRIV_DMA_SZ);
+	/*
+	 * First item in chunk of DMA memory: 32-slot command table,
+	 * 32 bytes each in size
+	 */
+	pp->cmd_slot = (struct ahci_cmd_hdr *)mem;
+	debug("cmd_slot = 0x%x\n",pp->cmd_slot);
+
+	mem += (AHCI_CMD_SLOT_SZ + 224);
+	/*
+	 * Second item: Received-FIS area
+	 */
+	pp->rx_fis = mem;
+
+	mem += AHCI_RX_FIS_SZ;
+	/*
+	 * Third item: data area for storing a single command
+	 * and its scatter-gather table
+	 */
+	pp->cmd_tbl = mem;
+	debug("cmd_tbl_dma = 0x%x\n",pp->cmd_tbl);
+
+	mem += AHCI_CMD_TBL_HDR;
+	pp->cmd_tbl_sg = (struct ahci_sg *)mem;
+
+	writel_with_flush((u32)pp->cmd_slot, port_mmio + PORT_LST_ADDR);
+
+	writel_with_flush(pp->rx_fis, port_mmio + PORT_FIS_ADDR);
+
+	writel_with_flush(PORT_CMD_ICC_ACTIVE | PORT_CMD_FIS_RX |
+	       PORT_CMD_POWER_ON | PORT_CMD_SPIN_UP |
+	       PORT_CMD_START, port_mmio + PORT_CMD);
+
+	debug("Exit start port %d\n",port);
+
+	return 0;
+}
+
+
+static int get_ahci_device_data(u8 port, u8 *fis, int fis_len, u8 *buf, int buf_len)
+{
+
+	struct ahci_ioports *pp =  &(probe_ent->port[port]);
+	volatile u8* port_mmio = (volatile u8 *)pp->port_mmio;
+	u32 opts;
+	u32 port_status;
+	int sg_count;
+
+	debug("Enter get_ahci_device_data: for port %d\n",port);
+
+	if(port > probe_ent->n_ports){
+		printf("Invaild port number %d\n", port);
+		return -1;
+	}
+
+	port_status = readl(port_mmio + PORT_SCR_STAT);
+	if((port_status & 0xf) != 0x03){
+		debug("No Link on port %d!\n",port);
+		return -1;
+	}
+
+	memcpy((unsigned char *)pp->cmd_tbl, fis, fis_len);
+
+	sg_count = ahci_fill_sg(port,buf,buf_len);
+	opts = (fis_len >> 2) | (sg_count << 16) ;
+	ahci_fill_cmd_slot(pp, opts);
+
+	writel_with_flush(1, port_mmio + PORT_CMD_ISSUE);
+
+	if (waiting_for_cmd_completed(port_mmio + PORT_CMD_ISSUE, 150, 0x1)) {
+		printf("timeout exit!\n");
+		return -1;
+	}
+	debug("get_ahci_device_data: %d byte transferred.\n",
+			pp->cmd_slot->status);
+
+	return 0;
+}
+
+
+static char *ata_id_strcpy(u16 *target, u16 *src, int len)
+{
+	int i;
+	for(i = 0; i < len / 2; i++)
+		target[i] = le16_to_cpu(src[i]);
+	return (char *)target;
+}
+
+
+static void dump_ataid(hd_driveid_t *ataid)
+{
+	debug("(49)ataid->capability = 0x%x\n", ataid->capability);
+	debug("(53)ataid->field_valid =0x%x\n", ataid->field_valid);
+	debug("(63)ataid->dma_mword = 0x%x\n", ataid->dma_mword);
+	debug("(64)ataid->eide_pio_modes = 0x%x\n", ataid->eide_pio_modes);
+	debug("(75)ataid->queue_depth = 0x%x\n", ataid->queue_depth);
+	debug("(80)ataid->major_rev_num = 0x%x\n", ataid->major_rev_num);
+	debug("(81)ataid->minor_rev_num = 0x%x\n", ataid->minor_rev_num);
+	debug("(82)ataid->command_set_1 = 0x%x\n", ataid->command_set_1);
+	debug("(83)ataid->command_set_2 = 0x%x\n", ataid->command_set_2);
+	debug("(84)ataid->cfsse = 0x%x\n", ataid->cfsse);
+	debug("(85)ataid->cfs_enable_1 = 0x%x\n", ataid->cfs_enable_1);
+	debug("(86)ataid->cfs_enable_2 = 0x%x\n", ataid->cfs_enable_2);
+	debug("(87)ataid->csf_default = 0x%x\n", ataid->csf_default);
+	debug("(88)ataid->dma_ultra = 0x%x\n", ataid->dma_ultra);
+	debug("(93)ataid->hw_config = 0x%x\n", ataid->hw_config);
+}
+
+/*
+ * SCSI INQUIRY command operation.
+ */
+static int ata_scsiop_inquiry(ccb *pccb)
+{
+	u8 hdr[] = {
+		0,
+		0,
+		0x5,	/* claim SPC-3 version compatibility */
+		2,
+		95 - 4,
+	};
+	u8 fis[20];
+	u8 *tmpid;
+	u8 port;
+
+	/* Clean ccb data buffer */
+	memset(pccb->pdata, 0, pccb->datalen);
+
+	memcpy(pccb->pdata, hdr, sizeof(hdr));
+
+	if(pccb->datalen <= 35)
+		return 0;
+
+	memset(fis, 0, 20);
+	/* Construct the FIS */
+	fis[0] = 0x27;			/* Host to device FIS. */
+	fis[1] = 1 << 7;		/* Command FIS. */
+	fis[2] = ATA_CMD_IDENT;		/* Command byte. */
+
+	/* Read id from sata */
+	port = pccb->target;
+	if(!(tmpid = malloc(sizeof(hd_driveid_t))))
+		return -ENOMEM;
+
+	if(get_ahci_device_data(port, (u8 *)&fis, 20,
+			tmpid, sizeof(hd_driveid_t))){
+		debug("scsi_ahci: SCSI inquiry command failure.\n");
+		return -EIO;
+	}
+
+	if(ataid[port])
+		free(ataid[port]);
+	ataid[port] = (hd_driveid_t *)tmpid;
+
+	memcpy(&pccb->pdata[8], "ATA     ", 8);
+	ata_id_strcpy((u16 *)&pccb->pdata[16], (u16 *)ataid[port]->model, 16);
+	ata_id_strcpy((u16 *)&pccb->pdata[32], (u16 *)ataid[port]->fw_rev, 4);
+
+	dump_ataid(ataid[port]);
+	return 0;
+}
+
+
+/*
+ * SCSI READ10 command operation.
+ */
+static int ata_scsiop_read10(ccb *pccb)
+{
+	u64 lba = 0;
+	u32 len = 0;
+	u8 fis[20];
+
+	lba = (((u64)pccb->cmd[2]) << 24) | (((u64)pccb->cmd[3]) << 16)
+		| (((u64)pccb->cmd[4]) << 8) | ((u64)pccb->cmd[5]);
+	len = (((u32)pccb->cmd[7]) << 8) | ((u32)pccb->cmd[8]);
+
+	/* For 10-byte and 16-byte SCSI R/W commands, transfer
+	 * length 0 means transfer 0 block of data.
+	 * However, for ATA R/W commands, sector count 0 means
+	 * 256 or 65536 sectors, not 0 sectors as in SCSI.
+	 *
+	 * WARNING: one or two older ATA drives treat 0 as 0...
+	 */
+	if(!len) return 0;
+	memset(fis, 0, 20);
+
+	/* Construct the FIS */
+	fis[0] = 0x27;			/* Host to device FIS. */
+	fis[1] = 1 << 7;		/* Command FIS. */
+	fis[2] = ATA_CMD_RD_DMA;	/* Command byte. */
+
+	/* LBA address, only support LBA28 in this driver*/
+	fis[4] = pccb->cmd[5];
+	fis[5] = pccb->cmd[4];
+	fis[6] = pccb->cmd[3];
+	fis[7] = (pccb->cmd[2] & 0x0f) | 0xe0;
+
+	/* Sector Count */
+	fis[12] = pccb->cmd[8];
+	fis[13] = pccb->cmd[7];
+
+	/* Read from ahci */
+	if(get_ahci_device_data(pccb->target, (u8*)&fis, 20,
+				pccb->pdata, pccb->datalen)){
+		debug("scsi_ahci: SCSI READ10 command failure.\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+
+/*
+ * SCSI READ CAPACITY10 command operation.
+ */
+static int ata_scsiop_read_capacity10(ccb *pccb)
+{
+	u8 buf[8];
+
+	if(!ataid[pccb->target]) {
+		printf("scsi_ahci: SCSI READ CAPACITY10 command failure. "
+			"\tNo ATA info!\n"
+			"\tPlease run SCSI commmand INQUIRY firstly!\n");
+		return -EPERM;
+	}
+
+	memset(buf, 0, 8);
+
+	*(u32 *)buf = le32_to_cpu(ataid[pccb->target]->lba_capacity);
+
+	buf[6] = 512 >> 8;
+	buf[7] = 512 & 0xff;
+
+	memcpy(pccb->pdata, buf, 8);
+
+	return 0;
+}
+
+
+/*
+ * SCSI TEST UNIT READY command operation.
+ */
+static int ata_scsiop_test_unit_ready(ccb *pccb)
+{
+	return (ataid[pccb->target]) ? 0 : -EPERM;
+}
+
+int scsi_exec(ccb *pccb)
+{
+	int ret;
+
+	switch(pccb->cmd[0]) {
+	case SCSI_READ10:
+		ret = ata_scsiop_read10(pccb);
+		break;
+	case SCSI_RD_CAPAC:
+		ret = ata_scsiop_read_capacity10(pccb);
+		break;
+	case SCSI_TST_U_RDY:
+		ret = ata_scsiop_test_unit_ready(pccb);
+		break;
+	case SCSI_INQUIRY:
+		ret = ata_scsiop_inquiry(pccb);
+		break;
+	default:
+		printf("Unsupport SCSI command 0x%02x\n", pccb->cmd[0]);
+		return FALSE;
+	}
+
+	if(ret) {
+		debug("SCSI command 0x%02x ret errno %d\n", pccb->cmd[0],ret);
+		return FALSE;
+	}
+	return TRUE;
+
+}
+
+
+void scsi_low_level_init(int busdevfunc)
+{
+	int i;
+	u32 linkmap;
+
+	ahci_init_one(busdevfunc);
+
+	linkmap = probe_ent->link_port_map;
+
+	for(i = 0; i < CFG_SCSI_MAX_SCSI_ID; i++){
+		if( ((linkmap >> i) & 0x01) ){
+			if(ahci_port_start((u8)i)){
+				printf("Can not start port %d\n",i);
+				continue;
+			}
+			ahci_set_feature((u8)i);
+		}
+	}
+}
+
+
+void scsi_bus_reset(void)
+{
+/*Not implement*/
+}
+
+
+void scsi_print_error(ccb *pccb)
+{
+/*The ahci error info can be read in the ahci driver*/
+}
+#endif