ahci.c

嵌入式试验箱S3C2410的bootloader源代码

	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