/*
   * Copyright (C) Freescale Semiconductor, Inc. 2006.
   * Author: Jason Jin<Jason.jin@freescale.com>
   *         Zhang Wei<wei.zhang@freescale.com>
   *
   * SPDX-License-Identifier:	GPL-2.0+
   *
   * with the reference on libata and ahci drvier in kernel
   */
  #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 <scsi.h>
  #include <libata.h>
  #include <linux/ctype.h>
  #include <ahci.h>
  
  static int ata_io_flush(u8 port);
  
  struct ahci_probe_ent *probe_ent = NULL;
  u16 *ataid[AHCI_MAX_PORTS];
  
  #define writel_with_flush(a,b)	do { writel(a,b); readl(b); } while (0)
  
  /*
   * Some controllers limit number of blocks they can read/write at once.
   * Contemporary SSD devices work much faster if the read/write size is aligned
   * to a power of 2.  Let's set default to 128 and allowing to be overwritten if
   * needed.
   */
  #ifndef MAX_SATA_BLOCKS_READ_WRITE
  #define MAX_SATA_BLOCKS_READ_WRITE	0x80
  #endif
  
  /* Maximum timeouts for each event */
  #define WAIT_MS_SPINUP	20000
  #define WAIT_MS_DATAIO	5000
  #define WAIT_MS_FLUSH	5000
  #define WAIT_MS_LINKUP	200
  
  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)
  
  static void ahci_dcache_flush_range(unsigned begin, unsigned len)
  {
  	const unsigned long start = begin;
  	const unsigned long end = start + len;
  
  	debug("%s: flush dcache: [%#lx, %#lx)
  ", __func__, start, end);
  	flush_dcache_range(start, end);
  }
  
  /*
   * SATA controller DMAs to physical RAM.  Ensure data from the
   * controller is invalidated from dcache; next access comes from
   * physical RAM.
   */
  static void ahci_dcache_invalidate_range(unsigned begin, unsigned len)
  {
  	const unsigned long start = begin;
  	const unsigned long end = start + len;
  
  	debug("%s: invalidate dcache: [%#lx, %#lx)
  ", __func__, start, end);
  	invalidate_dcache_range(start, end);
  }
  
  /*
   * Ensure data for SATA controller is flushed out of dcache and
   * written to physical memory.
   */
  static void ahci_dcache_flush_sata_cmd(struct ahci_ioports *pp)
  {
  	ahci_dcache_flush_range((unsigned long)pp->cmd_slot,
  				AHCI_PORT_PRIV_DMA_SZ);
  }
  
  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;
  }
  
  int __weak ahci_link_up(struct ahci_probe_ent *probe_ent, u8 port)
  {
  	u32 tmp;
  	int j = 0;
  	u8 *port_mmio = (u8 *)probe_ent->port[port].port_mmio;
  
  	/*
  	 * Bring up SATA link.
  	 * SATA link bringup time is usually less than 1 ms; only very
  	 * rarely has it taken between 1-2 ms. Never seen it above 2 ms.
  	 */
  	while (j < WAIT_MS_LINKUP) {
  		tmp = readl(port_mmio + PORT_SCR_STAT);
  		tmp &= PORT_SCR_STAT_DET_MASK;
  		if (tmp == PORT_SCR_STAT_DET_PHYRDY)
  			return 0;
  		udelay(1000);
  		j++;
  	}
  	return 1;
  }
  
  #ifdef CONFIG_SUNXI_AHCI
  /* The sunxi AHCI controller requires this undocumented setup */
  static void sunxi_dma_init(volatile u8 *port_mmio)
  {
  	clrsetbits_le32(port_mmio + PORT_P0DMACR, 0x0000ff00, 0x00004400);
  }
  #endif
  
  int ahci_reset(u32 base)
  {
  	int i = 1000;
  	u32 host_ctl_reg = base + HOST_CTL;
  	u32 tmp = readl(host_ctl_reg); /* global controller reset */
  
  	if ((tmp & HOST_RESET) == 0)
  		writel_with_flush(tmp | HOST_RESET, host_ctl_reg);
  
  	/*
  	 * reset must complete within 1 second, or
  	 * the hardware should be considered fried.
  	 */
  	do {
  		udelay(1000);
  		tmp = readl(host_ctl_reg);
  		i--;
  	} while ((i > 0) && (tmp & HOST_RESET));
  
  	if (i == 0) {
  		printf("controller reset failed (0x%x)
  ", tmp);
  		return -1;
  	}
  
  	return 0;
  }
  
  static int ahci_host_init(struct ahci_probe_ent *probe_ent)
  {
  #ifndef CONFIG_SCSI_AHCI_PLAT
  	pci_dev_t pdev = probe_ent->dev;
  	u16 tmp16;
  	unsigned short vendor;
  #endif
  	volatile u8 *mmio = (volatile u8 *)probe_ent->mmio_base;
  	u32 tmp, cap_save, cmd;
  	int i, j, ret;
  	volatile u8 *port_mmio;
  	u32 port_map;
  
  	debug("ahci_host_init: start
  ");
  
  	cap_save = readl(mmio + HOST_CAP);
  	cap_save &= ((1 << 28) | (1 << 17));
  	cap_save |= (1 << 27);  /* Staggered Spin-up. Not needed. */
  
  	ret = ahci_reset(probe_ent->mmio_base);
  	if (ret)
  		return ret;
  
  	writel_with_flush(HOST_AHCI_EN, mmio + HOST_CTL);
  	writel(cap_save, mmio + HOST_CAP);
  	writel_with_flush(0xf, mmio + HOST_PORTS_IMPL);
  
  #ifndef CONFIG_SCSI_AHCI_PLAT
  	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);
  	}
  #endif
  	probe_ent->cap = readl(mmio + HOST_CAP);
  	probe_ent->port_map = readl(mmio + HOST_PORTS_IMPL);
  	port_map = probe_ent->port_map;
  	probe_ent->n_ports = (probe_ent->cap & 0x1f) + 1;
  
  	debug("cap 0x%x  port_map 0x%x  n_ports %d
  ",
  	      probe_ent->cap, probe_ent->port_map, probe_ent->n_ports);
  
  	if (probe_ent->n_ports > CONFIG_SYS_SCSI_MAX_SCSI_ID)
  		probe_ent->n_ports = CONFIG_SYS_SCSI_MAX_SCSI_ID;
  
  	for (i = 0; i < probe_ent->n_ports; i++) {
  		if (!(port_map & (1 << i)))
  			continue;
  		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)) {
  			debug("Port %d is active. Deactivating.
  ", i);
  			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);
  		}
  
  #ifdef CONFIG_SUNXI_AHCI
  		sunxi_dma_init(port_mmio);
  #endif
  
  		/* Add the spinup command to whatever mode bits may
  		 * already be on in the command register.
  		 */
  		cmd = readl(port_mmio + PORT_CMD);
  		cmd |= PORT_CMD_SPIN_UP;
  		writel_with_flush(cmd, port_mmio + PORT_CMD);
  
  		/* Bring up SATA link. */
  		ret = ahci_link_up(probe_ent, i);
  		if (ret) {
  			printf("SATA link %d timeout.
  ", i);
  			continue;
  		} else {
  			debug("SATA link ok.
  ");
  		}
  
  		/* Clear error status */
  		tmp = readl(port_mmio + PORT_SCR_ERR);
  		if (tmp)
  			writel(tmp, port_mmio + PORT_SCR_ERR);
  
  		debug("Spinning up device on SATA port %d... ", i);
  
  		j = 0;
  		while (j < WAIT_MS_SPINUP) {
  			tmp = readl(port_mmio + PORT_TFDATA);
  			if (!(tmp & (ATA_BUSY | ATA_DRQ)))
  				break;
  			udelay(1000);
  			tmp = readl(port_mmio + PORT_SCR_STAT);
  			tmp &= PORT_SCR_STAT_DET_MASK;
  			if (tmp == PORT_SCR_STAT_DET_PHYRDY)
  				break;
  			j++;
  		}
  
  		tmp = readl(port_mmio + PORT_SCR_STAT) & PORT_SCR_STAT_DET_MASK;
  		if (tmp == PORT_SCR_STAT_DET_COMINIT) {
  			debug("SATA link %d down (COMINIT received), retrying...
  ", i);
  			i--;
  			continue;
  		}
  
  		printf("Target spinup took %d ms.
  ", j);
  		if (j == WAIT_MS_SPINUP)
  			debug("timeout.
  ");
  		else
  			debug("ok.
  ");
  
  		tmp = readl(port_mmio + PORT_SCR_ERR);
  		debug("PORT_SCR_ERR 0x%x
  ", 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
  ", 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("SATA port %d status: 0x%x
  ", i, tmp);
  		if ((tmp & PORT_SCR_STAT_DET_MASK) == PORT_SCR_STAT_DET_PHYRDY)
  			probe_ent->link_port_map |= (0x01 << i);
  	}
  
  	tmp = readl(mmio + HOST_CTL);
  	debug("HOST_CTL 0x%x
  ", tmp);
  	writel(tmp | HOST_IRQ_EN, mmio + HOST_CTL);
  	tmp = readl(mmio + HOST_CTL);
  	debug("HOST_CTL 0x%x
  ", tmp);
  #ifndef CONFIG_SCSI_AHCI_PLAT
  	pci_read_config_word(pdev, PCI_COMMAND, &tmp16);
  	tmp |= PCI_COMMAND_MASTER;
  	pci_write_config_word(pdev, PCI_COMMAND, tmp16);
  #endif
  	return 0;
  }
  
  
  static void ahci_print_info(struct ahci_probe_ent *probe_ent)
  {
  #ifndef CONFIG_SCSI_AHCI_PLAT
  	pci_dev_t pdev = probe_ent->dev;
  	u16 cc;
  #endif
  	volatile u8 *mmio = (volatile u8 *)probe_ent->mmio_base;
  	u32 vers, cap, cap2, impl, speed;
  	const char *speed_s;
  	const char *scc_s;
  
  	vers = readl(mmio + HOST_VERSION);
  	cap = probe_ent->cap;
  	cap2 = readl(mmio + HOST_CAP2);
  	impl = probe_ent->port_map;
  
  	speed = (cap >> 20) & 0xf;
  	if (speed == 1)
  		speed_s = "1.5";
  	else if (speed == 2)
  		speed_s = "3";
  	else if (speed == 3)
  		speed_s = "6";
  	else
  		speed_s = "?";
  
  #ifdef CONFIG_SCSI_AHCI_PLAT
  	scc_s = "SATA";
  #else
  	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";
  #endif
  	printf("AHCI %02x%02x.%02x%02x "
  	       "%u slots %u ports %s Gbps 0x%x impl %s mode
  ",
  	       (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%s"
  	       "%s%s%s%s%s%s
  ",
  	       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 << 16) ? "fbss " : "",
  	       cap & (1 << 15) ? "pio " : "",
  	       cap & (1 << 14) ? "slum " : "",
  	       cap & (1 << 13) ? "part " : "",
  	       cap & (1 << 7) ? "ccc " : "",
  	       cap & (1 << 6) ? "ems " : "",
  	       cap & (1 << 5) ? "sxs " : "",
  	       cap2 & (1 << 2) ? "apst " : "",
  	       cap2 & (1 << 1) ? "nvmp " : "",
  	       cap2 & (1 << 0) ? "boh " : "");
  }
  
  #ifndef CONFIG_SCSI_AHCI_PLAT
  static int ahci_init_one(pci_dev_t pdev)
  {
  	u16 vendor;
  	int rc;
  
  	probe_ent = malloc(sizeof(struct ahci_probe_ent));
  	if (!probe_ent) {
  		printf("%s: No memory for probe_ent
  ", __func__);
  		return -ENOMEM;
  	}
  
  	memset(probe_ent, 0, sizeof(struct ahci_probe_ent));
  	probe_ent->dev = pdev;
  
  	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 */
  
  	pci_read_config_dword(pdev, PCI_BASE_ADDRESS_5, &probe_ent->mmio_base);
  	debug("ahci mmio_base=0x%08x
  ", probe_ent->mmio_base);
  
  	/* 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;
  }
  #endif
  
  #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!
  ");
  		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;
  }
  
  
  #ifdef CONFIG_AHCI_SETFEATURES_XFER
  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, sizeof(fis));
  	fis[0] = 0x27;
  	fis[1] = 1 << 7;
  	fis[2] = ATA_CMD_SET_FEATURES;
  	fis[3] = SETFEATURES_XFER;
  	fis[12] = __ilog2(probe_ent->udma_mask + 1) + 0x40 - 0x01;
  
  	memcpy((unsigned char *)pp->cmd_tbl, fis, sizeof(fis));
  	ahci_fill_cmd_slot(pp, cmd_fis_len);
  	ahci_dcache_flush_sata_cmd(pp);
  	writel(1, port_mmio + PORT_CMD_ISSUE);
  	readl(port_mmio + PORT_CMD_ISSUE);
  
  	if (waiting_for_cmd_completed(port_mmio + PORT_CMD_ISSUE,
  				WAIT_MS_DATAIO, 0x1)) {
  		printf("set feature error on port %d!
  ", port);
  	}
  }
  #endif
  
  static int wait_spinup(volatile u8 *port_mmio)
  {
  	ulong start;
  	u32 tf_data;
  
  	start = get_timer(0);
  	do {
  		tf_data = readl(port_mmio + PORT_TFDATA);
  		if (!(tf_data & ATA_BUSY))
  			return 0;
  	} while (get_timer(start) < WAIT_MS_SPINUP);
  
  	return -ETIMEDOUT;
  }
  
  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
  ", port);
  	port_status = readl(port_mmio + PORT_SCR_STAT);
  	debug("Port %d status: %x
  ", port, port_status);
  	if ((port_status & 0xf) != 0x03) {
  		printf("No Link on this port!
  ");
  		return -1;
  	}
  
  	mem = (u32) malloc(AHCI_PORT_PRIV_DMA_SZ + 2048);
  	if (!mem) {
  		free(pp);
  		printf("%s: No mem for table!
  ", __func__);
  		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 *)(uintptr_t)virt_to_phys((void *)mem);
  	debug("cmd_slot = 0x%x
  ", (unsigned)pp->cmd_slot);
  	mem += (AHCI_CMD_SLOT_SZ + 224);
  
  	/*
  	 * Second item: Received-FIS area
  	 */
  	pp->rx_fis = virt_to_phys((void *)mem);
  	mem += AHCI_RX_FIS_SZ;
  
  	/*
  	 * Third item: data area for storing a single command
  	 * and its scatter-gather table
  	 */
  	pp->cmd_tbl = virt_to_phys((void *)mem);
  	debug("cmd_tbl_dma = 0x%x
  ", pp->cmd_tbl);
  
  	mem += AHCI_CMD_TBL_HDR;
  	pp->cmd_tbl_sg =
  			(struct ahci_sg *)(uintptr_t)virt_to_phys((void *)mem);
  
  	writel_with_flush((u32) pp->cmd_slot, port_mmio + PORT_LST_ADDR);
  
  	writel_with_flush(pp->rx_fis, port_mmio + PORT_FIS_ADDR);
  
  #ifdef CONFIG_SUNXI_AHCI
  	sunxi_dma_init(port_mmio);
  #endif
  
  	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
  ", port);
  
  	/*
  	 * Make sure interface is not busy based on error and status
  	 * information from task file data register before proceeding
  	 */
  	return wait_spinup(port_mmio);
  }
  
  
  static int ahci_device_data_io(u8 port, u8 *fis, int fis_len, u8 *buf,
  				int buf_len, u8 is_write)
  {
  
  	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 %s: for port %d
  ", __func__, port);
  
  	if (port > probe_ent->n_ports) {
  		printf("Invalid port number %d
  ", port);
  		return -1;
  	}
  
  	port_status = readl(port_mmio + PORT_SCR_STAT);
  	if ((port_status & 0xf) != 0x03) {
  		debug("No Link on port %d!
  ", 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) | (is_write << 6);
  	ahci_fill_cmd_slot(pp, opts);
  
  	ahci_dcache_flush_sata_cmd(pp);
  	ahci_dcache_flush_range((unsigned)buf, (unsigned)buf_len);
  
  	writel_with_flush(1, port_mmio + PORT_CMD_ISSUE);
  
  	if (waiting_for_cmd_completed(port_mmio + PORT_CMD_ISSUE,
  				WAIT_MS_DATAIO, 0x1)) {
  		printf("timeout exit!
  ");
  		return -1;
  	}
  
  	ahci_dcache_invalidate_range((unsigned)buf, (unsigned)buf_len);
  	debug("%s: %d byte transferred.
  ", __func__, 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] = swab16(src[i]);
  	return (char *)target;
  }
  
  /*
   * SCSI INQUIRY command operation.
   */
  static int ata_scsiop_inquiry(ccb *pccb)
  {
  	static const u8 hdr[] = {
  		0,
  		0,
  		0x5,		/* claim SPC-3 version compatibility */
  		2,
  		95 - 4,
  	};
  	u8 fis[20];
  	u16 *idbuf;
  	ALLOC_CACHE_ALIGN_BUFFER(u16, tmpid, ATA_ID_WORDS);
  	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, sizeof(fis));
  	/* Construct the FIS */
  	fis[0] = 0x27;		/* Host to device FIS. */
  	fis[1] = 1 << 7;	/* Command FIS. */
  	fis[2] = ATA_CMD_ID_ATA; /* Command byte. */
  
  	/* Read id from sata */
  	port = pccb->target;
  
  	if (ahci_device_data_io(port, (u8 *) &fis, sizeof(fis), (u8 *)tmpid,
  				ATA_ID_WORDS * 2, 0)) {
  		debug("scsi_ahci: SCSI inquiry command failure.
  ");
  		return -EIO;
  	}
  
  	if (!ataid[port]) {
  		ataid[port] = malloc(ATA_ID_WORDS * 2);
  		if (!ataid[port]) {
  			printf("%s: No memory for ataid[port]
  ", __func__);
  			return -ENOMEM;
  		}
  	}
  
  	idbuf = ataid[port];
  
  	memcpy(idbuf, tmpid, ATA_ID_WORDS * 2);
  	ata_swap_buf_le16(idbuf, ATA_ID_WORDS);
  
  	memcpy(&pccb->pdata[8], "ATA     ", 8);
  	ata_id_strcpy((u16 *)&pccb->pdata[16], &idbuf[ATA_ID_PROD], 16);
  	ata_id_strcpy((u16 *)&pccb->pdata[32], &idbuf[ATA_ID_FW_REV], 4);
  
  #ifdef DEBUG
  	ata_dump_id(idbuf);
  #endif
  	return 0;
  }
  
  
  /*
   * SCSI READ10/WRITE10 command operation.
   */
  static int ata_scsiop_read_write(ccb *pccb, u8 is_write)
  {
  	u32 lba = 0;
  	u16 blocks = 0;
  	u8 fis[20];
  	u8 *user_buffer = pccb->pdata;
  	u32 user_buffer_size = pccb->datalen;
  
  	/* Retrieve the base LBA number from the ccb structure. */
  	memcpy(&lba, pccb->cmd + 2, sizeof(lba));
  	lba = be32_to_cpu(lba);
  
  	/*
  	 * And the number of blocks.
  	 *
  	 * 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...
  	 */
  	blocks = (((u16)pccb->cmd[7]) << 8) | ((u16) pccb->cmd[8]);
  
  	debug("scsi_ahci: %s %d blocks starting from lba 0x%x
  ",
  	      is_write ?  "write" : "read", (unsigned)lba, blocks);
  
  	/* Preset the FIS */
  	memset(fis, 0, sizeof(fis));
  	fis[0] = 0x27;		 /* Host to device FIS. */
  	fis[1] = 1 << 7;	 /* Command FIS. */
  	/* Command byte (read/write). */
  	fis[2] = is_write ? ATA_CMD_WRITE_EXT : ATA_CMD_READ_EXT;
  
  	while (blocks) {
  		u16 now_blocks; /* number of blocks per iteration */
  		u32 transfer_size; /* number of bytes per iteration */
  
  		now_blocks = min((u16)MAX_SATA_BLOCKS_READ_WRITE, blocks);
  
  		transfer_size = ATA_SECT_SIZE * now_blocks;
  		if (transfer_size > user_buffer_size) {
  			printf("scsi_ahci: Error: buffer too small.
  ");
  			return -EIO;
  		}
  
  		/* LBA48 SATA command but only use 32bit address range within
  		 * that. The next smaller command range (28bit) is too small.
  		 */
  		fis[4] = (lba >> 0) & 0xff;
  		fis[5] = (lba >> 8) & 0xff;
  		fis[6] = (lba >> 16) & 0xff;
  		fis[7] = 1 << 6; /* device reg: set LBA mode */
  		fis[8] = ((lba >> 24) & 0xff);
  		fis[3] = 0xe0; /* features */
  
  		/* Block (sector) count */
  		fis[12] = (now_blocks >> 0) & 0xff;
  		fis[13] = (now_blocks >> 8) & 0xff;
  
  		/* Read/Write from ahci */
  		if (ahci_device_data_io(pccb->target, (u8 *) &fis, sizeof(fis),
  					user_buffer, transfer_size,
  					is_write)) {
  			debug("scsi_ahci: SCSI %s10 command failure.
  ",
  			      is_write ? "WRITE" : "READ");
  			return -EIO;
  		}
  
  		/* If this transaction is a write, do a following flush.
  		 * Writes in u-boot are so rare, and the logic to know when is
  		 * the last write and do a flush only there is sufficiently
  		 * difficult. Just do a flush after every write. This incurs,
  		 * usually, one extra flush when the rare writes do happen.
  		 */
  		if (is_write) {
  			if (-EIO == ata_io_flush(pccb->target))
  				return -EIO;
  		}
  		user_buffer += transfer_size;
  		user_buffer_size -= transfer_size;
  		blocks -= now_blocks;
  		lba += now_blocks;
  	}
  
  	return 0;
  }
  
  
  /*
   * SCSI READ CAPACITY10 command operation.
   */
  static int ata_scsiop_read_capacity10(ccb *pccb)
  {
  	u32 cap;
  	u64 cap64;
  	u32 block_size;
  
  	if (!ataid[pccb->target]) {
  		printf("scsi_ahci: SCSI READ CAPACITY10 command failure. "
  		       "\tNo ATA info!
  "
  		       "\tPlease run SCSI commmand INQUIRY firstly!
  ");
  		return -EPERM;
  	}
  
  	cap64 = ata_id_n_sectors(ataid[pccb->target]);
  	if (cap64 > 0x100000000ULL)
  		cap64 = 0xffffffff;
  
  	cap = cpu_to_be32(cap64);
  	memcpy(pccb->pdata, &cap, sizeof(cap));
  
  	block_size = cpu_to_be32((u32)512);
  	memcpy(&pccb->pdata[4], &block_size, 4);
  
  	return 0;
  }
  
  
  /*
   * SCSI READ CAPACITY16 command operation.
   */
  static int ata_scsiop_read_capacity16(ccb *pccb)
  {
  	u64 cap;
  	u64 block_size;
  
  	if (!ataid[pccb->target]) {
  		printf("scsi_ahci: SCSI READ CAPACITY16 command failure. "
  		       "\tNo ATA info!
  "
  		       "\tPlease run SCSI commmand INQUIRY firstly!
  ");
  		return -EPERM;
  	}
  
  	cap = ata_id_n_sectors(ataid[pccb->target]);
  	cap = cpu_to_be64(cap);
  	memcpy(pccb->pdata, &cap, sizeof(cap));
  
  	block_size = cpu_to_be64((u64)512);
  	memcpy(&pccb->pdata[8], &block_size, 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_read_write(pccb, 0);
  		break;
  	case SCSI_WRITE10:
  		ret = ata_scsiop_read_write(pccb, 1);
  		break;
  	case SCSI_RD_CAPAC10:
  		ret = ata_scsiop_read_capacity10(pccb);
  		break;
  	case SCSI_RD_CAPAC16:
  		ret = ata_scsiop_read_capacity16(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
  ", pccb->cmd[0]);
  		return false;
  	}
  
  	if (ret) {
  		debug("SCSI command 0x%02x ret errno %d
  ", pccb->cmd[0], ret);
  		return false;
  	}
  	return true;
  
  }
  
  
  void scsi_low_level_init(int busdevfunc)
  {
  	int i;
  	u32 linkmap;
  
  #ifndef CONFIG_SCSI_AHCI_PLAT
  	ahci_init_one(busdevfunc);
  #endif
  
  	linkmap = probe_ent->link_port_map;
  
  	for (i = 0; i < CONFIG_SYS_SCSI_MAX_SCSI_ID; i++) {
  		if (((linkmap >> i) & 0x01)) {
  			if (ahci_port_start((u8) i)) {
  				printf("Can not start port %d
  ", i);
  				continue;
  			}
  #ifdef CONFIG_AHCI_SETFEATURES_XFER
  			ahci_set_feature((u8) i);
  #endif
  		}
  	}
  }
  
  #ifdef CONFIG_SCSI_AHCI_PLAT
  int ahci_init(u32 base)
  {
  	int i, rc = 0;
  	u32 linkmap;
  
  	probe_ent = malloc(sizeof(struct ahci_probe_ent));
  	if (!probe_ent) {
  		printf("%s: No memory for probe_ent
  ", __func__);
  		return -ENOMEM;
  	}
  
  	memset(probe_ent, 0, sizeof(struct ahci_probe_ent));
  
  	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 = base;
  
  	/* initialize adapter */
  	rc = ahci_host_init(probe_ent);
  	if (rc)
  		goto err_out;
  
  	ahci_print_info(probe_ent);
  
  	linkmap = probe_ent->link_port_map;
  
  	for (i = 0; i < CONFIG_SYS_SCSI_MAX_SCSI_ID; i++) {
  		if (((linkmap >> i) & 0x01)) {
  			if (ahci_port_start((u8) i)) {
  				printf("Can not start port %d
  ", i);
  				continue;
  			}
  #ifdef CONFIG_AHCI_SETFEATURES_XFER
  			ahci_set_feature((u8) i);
  #endif
  		}
  	}
  err_out:
  	return rc;
  }
  
  void __weak scsi_init(void)
  {
  }
  
  #endif
  
  /*
   * In the general case of generic rotating media it makes sense to have a
   * flush capability. It probably even makes sense in the case of SSDs because
   * one cannot always know for sure what kind of internal cache/flush mechanism
   * is embodied therein. At first it was planned to invoke this after the last
   * write to disk and before rebooting. In practice, knowing, a priori, which
   * is the last write is difficult. Because writing to the disk in u-boot is
   * very rare, this flush command will be invoked after every block write.
   */
  static int ata_io_flush(u8 port)
  {
  	u8 fis[20];
  	struct ahci_ioports *pp = &(probe_ent->port[port]);
  	volatile u8 *port_mmio = (volatile u8 *)pp->port_mmio;
  	u32 cmd_fis_len = 5;	/* five dwords */
  
  	/* Preset the FIS */
  	memset(fis, 0, 20);
  	fis[0] = 0x27;		 /* Host to device FIS. */
  	fis[1] = 1 << 7;	 /* Command FIS. */
  	fis[2] = ATA_CMD_FLUSH_EXT;
  
  	memcpy((unsigned char *)pp->cmd_tbl, fis, 20);
  	ahci_fill_cmd_slot(pp, cmd_fis_len);
  	writel_with_flush(1, port_mmio + PORT_CMD_ISSUE);
  
  	if (waiting_for_cmd_completed(port_mmio + PORT_CMD_ISSUE,
  			WAIT_MS_FLUSH, 0x1)) {
  		debug("scsi_ahci: flush command timeout on port %d.
  ", port);
  		return -EIO;
  	}
  
  	return 0;
  }
  
  
  __weak void scsi_bus_reset(void)
  {
  	/*Not implement*/
  }
  
  void scsi_print_error(ccb * pccb)
  {
  	/*The ahci error info can be read in the ahci driver*/
  }