drivers/scsi/scsi.c - filogic/uboot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2001
  * Denis Peter, MPL AG Switzerland
  */

 #define LOG_CATEGORY	UCLASS_SCSI

 #include <blk.h>
 #include <bootdev.h>
 #include <bootstage.h>
 #include <dm.h>
 #include <env.h>
 #include <libata.h>
 #include <log.h>
 #include <memalign.h>
 #include <part.h>
 #include <pci.h>
 #include <scsi.h>
 #include <dm/device-internal.h>
 #include <dm/uclass-internal.h>

 static struct scsi_cmd tempccb;	/* temporary scsi command buffer */

 DEFINE_CACHE_ALIGN_BUFFER(u8, tempbuff, 512);	/* temporary data buffer */

 /* almost the maximum amount of the scsi_ext command.. */
 #define SCSI_MAX_BLK 0xFFFF
 #define SCSI_LBA48_READ	0xFFFFFFF

 static void scsi_print_error(struct scsi_cmd *pccb)
 {
 	/* Dummy function that could print an error for debugging */
 }

 #ifdef CONFIG_SYS_64BIT_LBA
 void scsi_setup_read16(struct scsi_cmd *pccb, lbaint_t start,
 		       unsigned long blocks)
 {
 	pccb->cmd[0] = SCSI_READ16;
 	pccb->cmd[1] = pccb->lun << 5;
 	pccb->cmd[2] = (unsigned char)(start >> 56) & 0xff;
 	pccb->cmd[3] = (unsigned char)(start >> 48) & 0xff;
 	pccb->cmd[4] = (unsigned char)(start >> 40) & 0xff;
 	pccb->cmd[5] = (unsigned char)(start >> 32) & 0xff;
 	pccb->cmd[6] = (unsigned char)(start >> 24) & 0xff;
 	pccb->cmd[7] = (unsigned char)(start >> 16) & 0xff;
 	pccb->cmd[8] = (unsigned char)(start >> 8) & 0xff;
 	pccb->cmd[9] = (unsigned char)start & 0xff;
 	pccb->cmd[10] = 0;
 	pccb->cmd[11] = (unsigned char)(blocks >> 24) & 0xff;
 	pccb->cmd[12] = (unsigned char)(blocks >> 16) & 0xff;
 	pccb->cmd[13] = (unsigned char)(blocks >> 8) & 0xff;
 	pccb->cmd[14] = (unsigned char)blocks & 0xff;
 	pccb->cmd[15] = 0;
 	pccb->cmdlen = 16;
 	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
 	debug("scsi_setup_read16: cmd: %02X %02X startblk %02X%02X%02X%02X%02X%02X%02X%02X blccnt %02X%02X%02X%02X\n",
 	      pccb->cmd[0], pccb->cmd[1],
 	      pccb->cmd[2], pccb->cmd[3], pccb->cmd[4], pccb->cmd[5],
 	      pccb->cmd[6], pccb->cmd[7], pccb->cmd[8], pccb->cmd[9],
 	      pccb->cmd[11], pccb->cmd[12], pccb->cmd[13], pccb->cmd[14]);
 }
 #endif

 static void scsi_setup_inquiry(struct scsi_cmd *pccb)
 {
 	pccb->cmd[0] = SCSI_INQUIRY;
 	pccb->cmd[1] = pccb->lun << 5;
 	pccb->cmd[2] = 0;
 	pccb->cmd[3] = 0;
 	if (pccb->datalen > 255)
 		pccb->cmd[4] = 255;
 	else
 		pccb->cmd[4] = (unsigned char)pccb->datalen;
 	pccb->cmd[5] = 0;
 	pccb->cmdlen = 6;
 	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
 }

 static void scsi_setup_read_ext(struct scsi_cmd *pccb, lbaint_t start,
 				unsigned short blocks)
 {
 	pccb->cmd[0] = SCSI_READ10;
 	pccb->cmd[1] = pccb->lun << 5;
 	pccb->cmd[2] = (unsigned char)(start >> 24) & 0xff;
 	pccb->cmd[3] = (unsigned char)(start >> 16) & 0xff;
 	pccb->cmd[4] = (unsigned char)(start >> 8) & 0xff;
 	pccb->cmd[5] = (unsigned char)start & 0xff;
 	pccb->cmd[6] = 0;
 	pccb->cmd[7] = (unsigned char)(blocks >> 8) & 0xff;
 	pccb->cmd[8] = (unsigned char)blocks & 0xff;
 	pccb->cmd[6] = 0;
 	pccb->cmdlen = 10;
 	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
 	debug("scsi_setup_read_ext: cmd: %02X %02X startblk %02X%02X%02X%02X blccnt %02X%02X\n",
 	      pccb->cmd[0], pccb->cmd[1],
 	      pccb->cmd[2], pccb->cmd[3], pccb->cmd[4], pccb->cmd[5],
 	      pccb->cmd[7], pccb->cmd[8]);
 }

 static void scsi_setup_write_ext(struct scsi_cmd *pccb, lbaint_t start,
 				 unsigned short blocks)
 {
 	pccb->cmd[0] = SCSI_WRITE10;
 	pccb->cmd[1] = pccb->lun << 5;
 	pccb->cmd[2] = (unsigned char)(start >> 24) & 0xff;
 	pccb->cmd[3] = (unsigned char)(start >> 16) & 0xff;
 	pccb->cmd[4] = (unsigned char)(start >> 8) & 0xff;
 	pccb->cmd[5] = (unsigned char)start & 0xff;
 	pccb->cmd[6] = 0;
 	pccb->cmd[7] = ((unsigned char)(blocks >> 8)) & 0xff;
 	pccb->cmd[8] = (unsigned char)blocks & 0xff;
 	pccb->cmd[9] = 0;
 	pccb->cmdlen = 10;
 	pccb->msgout[0] = SCSI_IDENTIFY;  /* NOT USED */
 	debug("%s: cmd: %02X %02X startblk %02X%02X%02X%02X blccnt %02X%02X\n",
 	      __func__,
 	      pccb->cmd[0], pccb->cmd[1],
 	      pccb->cmd[2], pccb->cmd[3], pccb->cmd[4], pccb->cmd[5],
 	      pccb->cmd[7], pccb->cmd[8]);
 }

 static ulong scsi_read(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
 		       void *buffer)
 {
 	struct blk_desc *block_dev = dev_get_uclass_plat(dev);
 	struct udevice *bdev = dev->parent;
 	struct scsi_plat *uc_plat = dev_get_uclass_plat(bdev);
 	lbaint_t start, blks, max_blks;
 	uintptr_t buf_addr;
 	unsigned short smallblks = 0;
 	struct scsi_cmd *pccb = (struct scsi_cmd *)&tempccb;

 	/* Setup device */
 	pccb->target = block_dev->target;
 	pccb->lun = block_dev->lun;
 	buf_addr = (unsigned long)buffer;
 	start = blknr;
 	blks = blkcnt;
 	if (uc_plat->max_bytes_per_req)
 		max_blks = uc_plat->max_bytes_per_req / block_dev->blksz;
 	else
 		max_blks = SCSI_MAX_BLK;

 	debug("\nscsi_read: dev %d startblk " LBAF
 	      ", blccnt " LBAF " buffer %lx\n",
 	      block_dev->devnum, start, blks, (unsigned long)buffer);
 	do {
 		pccb->pdata = (unsigned char *)buf_addr;
 		pccb->dma_dir = DMA_FROM_DEVICE;
 #ifdef CONFIG_SYS_64BIT_LBA
 		if (start > SCSI_LBA48_READ) {
 			unsigned long blocks;
 			blocks = min_t(lbaint_t, blks, max_blks);
 			pccb->datalen = block_dev->blksz * blocks;
 			scsi_setup_read16(pccb, start, blocks);
 			start += blocks;
 			blks -= blocks;
 		} else
 #endif
 		if (blks > max_blks) {
 			pccb->datalen = block_dev->blksz * max_blks;
 			smallblks = max_blks;
 			scsi_setup_read_ext(pccb, start, smallblks);
 			start += max_blks;
 			blks -= max_blks;
 		} else {
 			pccb->datalen = block_dev->blksz * blks;
 			smallblks = (unsigned short)blks;
 			scsi_setup_read_ext(pccb, start, smallblks);
 			start += blks;
 			blks = 0;
 		}
 		debug("scsi_read_ext: startblk " LBAF
 		      ", blccnt %x buffer %lX\n",
 		      start, smallblks, buf_addr);
 		if (scsi_exec(bdev, pccb)) {
 			scsi_print_error(pccb);
 			blkcnt -= blks;
 			break;
 		}
 		buf_addr += pccb->datalen;
 	} while (blks != 0);
 	debug("scsi_read_ext: end startblk " LBAF
 	      ", blccnt %x buffer %lX\n", start, smallblks, buf_addr);
 	return blkcnt;
 }

 /*******************************************************************************
  * scsi_write
  */

 static ulong scsi_write(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
 			const void *buffer)
 {
 	struct blk_desc *block_dev = dev_get_uclass_plat(dev);
 	struct udevice *bdev = dev->parent;
 	struct scsi_plat *uc_plat = dev_get_uclass_plat(bdev);
 	lbaint_t start, blks, max_blks;
 	uintptr_t buf_addr;
 	unsigned short smallblks;
 	struct scsi_cmd *pccb = (struct scsi_cmd *)&tempccb;

 	/* Setup device */
 	pccb->target = block_dev->target;
 	pccb->lun = block_dev->lun;
 	buf_addr = (unsigned long)buffer;
 	start = blknr;
 	blks = blkcnt;
 	if (uc_plat->max_bytes_per_req)
 		max_blks = uc_plat->max_bytes_per_req / block_dev->blksz;
 	else
 		max_blks = SCSI_MAX_BLK;

 	debug("\n%s: dev %d startblk " LBAF ", blccnt " LBAF " buffer %lx\n",
 	      __func__, block_dev->devnum, start, blks, (unsigned long)buffer);
 	do {
 		pccb->pdata = (unsigned char *)buf_addr;
 		pccb->dma_dir = DMA_TO_DEVICE;
 		if (blks > max_blks) {
 			pccb->datalen = block_dev->blksz * max_blks;
 			smallblks = max_blks;
 			scsi_setup_write_ext(pccb, start, smallblks);
 			start += max_blks;
 			blks -= max_blks;
 		} else {
 			pccb->datalen = block_dev->blksz * blks;
 			smallblks = (unsigned short)blks;
 			scsi_setup_write_ext(pccb, start, smallblks);
 			start += blks;
 			blks = 0;
 		}
 		debug("%s: startblk " LBAF ", blccnt %x buffer %lx\n",
 		      __func__, start, smallblks, buf_addr);
 		if (scsi_exec(bdev, pccb)) {
 			scsi_print_error(pccb);
 			blkcnt -= blks;
 			break;
 		}
 		buf_addr += pccb->datalen;
 	} while (blks != 0);
 	debug("%s: end startblk " LBAF ", blccnt %x buffer %lX\n",
 	      __func__, start, smallblks, buf_addr);
 	return blkcnt;
 }

 #if IS_ENABLED(CONFIG_BOUNCE_BUFFER)
 static int scsi_buffer_aligned(struct udevice *dev, struct bounce_buffer *state)
 {
 	struct scsi_ops *ops = scsi_get_ops(dev->parent);

 	if (ops->buffer_aligned)
 		return ops->buffer_aligned(dev->parent, state);

 	return 1;
 }
 #endif	/* CONFIG_BOUNCE_BUFFER */

 /* copy src to dest, skipping leading and trailing blanks
  * and null terminate the string
  */
 static void scsi_ident_cpy(unsigned char *dest, unsigned char *src,
 			   unsigned int len)
 {
 	int start, end;

 	start = 0;
 	while (start < len) {
 		if (src[start] != ' ')
 			break;
 		start++;
 	}
 	end = len-1;
 	while (end > start) {
 		if (src[end] != ' ')
 			break;
 		end--;
 	}
 	for (; start <= end; start++)
 		*dest ++= src[start];
 	*dest = '\0';
 }

 static int scsi_read_capacity(struct udevice *dev, struct scsi_cmd *pccb,
 			      lbaint_t *capacity, unsigned long *blksz)
 {
 	*capacity = 0;

 	memset(pccb->cmd, '\0', sizeof(pccb->cmd));
 	pccb->cmd[0] = SCSI_RD_CAPAC10;
 	pccb->cmd[1] = pccb->lun << 5;
 	pccb->cmdlen = 10;
 	pccb->dma_dir = DMA_FROM_DEVICE;
 	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */

 	pccb->datalen = 8;
 	if (scsi_exec(dev, pccb))
 		return 1;

 	*capacity = ((lbaint_t)pccb->pdata[0] << 24) |
 		    ((lbaint_t)pccb->pdata[1] << 16) |
 		    ((lbaint_t)pccb->pdata[2] << 8)  |
 		    ((lbaint_t)pccb->pdata[3]);

 	if (*capacity != 0xffffffff) {
 		/* Read capacity (10) was sufficient for this drive. */
 		*blksz = ((unsigned long)pccb->pdata[4] << 24) |
 			 ((unsigned long)pccb->pdata[5] << 16) |
 			 ((unsigned long)pccb->pdata[6] << 8)  |
 			 ((unsigned long)pccb->pdata[7]);
 		return 0;
 	}

 	/* Read capacity (10) was insufficient. Use read capacity (16). */
 	memset(pccb->cmd, '\0', sizeof(pccb->cmd));
 	pccb->cmd[0] = SCSI_RD_CAPAC16;
 	pccb->cmd[1] = 0x10;
 	pccb->cmdlen = 16;
 	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */

 	pccb->datalen = 16;
 	pccb->dma_dir = DMA_FROM_DEVICE;
 	if (scsi_exec(dev, pccb))
 		return 1;

 	*capacity = ((uint64_t)pccb->pdata[0] << 56) |
 		    ((uint64_t)pccb->pdata[1] << 48) |
 		    ((uint64_t)pccb->pdata[2] << 40) |
 		    ((uint64_t)pccb->pdata[3] << 32) |
 		    ((uint64_t)pccb->pdata[4] << 24) |
 		    ((uint64_t)pccb->pdata[5] << 16) |
 		    ((uint64_t)pccb->pdata[6] << 8)  |
 		    ((uint64_t)pccb->pdata[7]);

 	*blksz = ((uint64_t)pccb->pdata[8]  << 56) |
 		 ((uint64_t)pccb->pdata[9]  << 48) |
 		 ((uint64_t)pccb->pdata[10] << 40) |
 		 ((uint64_t)pccb->pdata[11] << 32) |
 		 ((uint64_t)pccb->pdata[12] << 24) |
 		 ((uint64_t)pccb->pdata[13] << 16) |
 		 ((uint64_t)pccb->pdata[14] << 8)  |
 		 ((uint64_t)pccb->pdata[15]);

 	return 0;
 }

 /*
  * Some setup (fill-in) routines
  */
 static void scsi_setup_test_unit_ready(struct scsi_cmd *pccb)
 {
 	pccb->cmd[0] = SCSI_TST_U_RDY;
 	pccb->cmd[1] = pccb->lun << 5;
 	pccb->cmd[2] = 0;
 	pccb->cmd[3] = 0;
 	pccb->cmd[4] = 0;
 	pccb->cmd[5] = 0;
 	pccb->cmdlen = 6;
 	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
 }

 /**
  * scsi_init_dev_desc_priv - initialize only SCSI specific blk_desc properties
  *
  * @dev_desc: Block device description pointer
  */
 static void scsi_init_dev_desc_priv(struct blk_desc *dev_desc)
 {
 	memset(dev_desc, 0, sizeof(struct blk_desc));
 	dev_desc->target = 0xff;
 	dev_desc->lun = 0xff;
 	dev_desc->log2blksz =
 		LOG2_INVALID(typeof(dev_desc->log2blksz));
 	dev_desc->type = DEV_TYPE_UNKNOWN;
 #if IS_ENABLED(CONFIG_BOUNCE_BUFFER)
 	dev_desc->bb = true;
 #endif	/* CONFIG_BOUNCE_BUFFER */
 }

 /**
  * scsi_detect_dev - Detect scsi device
  *
  * @target: target id
  * @lun: target lun
  * @dev_desc: block device description
  *
  * The scsi_detect_dev detects and fills a dev_desc structure when the device is
  * detected.
  *
  * Return: 0 on success, error value otherwise
  */
 static int scsi_detect_dev(struct udevice *dev, int target, int lun,
 			   struct blk_desc *dev_desc)
 {
 	unsigned char perq, modi;
 	lbaint_t capacity;
 	unsigned long blksz;
 	struct scsi_cmd *pccb = (struct scsi_cmd *)&tempccb;
 	int count, err;

 	pccb->target = target;
 	pccb->lun = lun;
 	pccb->pdata = tempbuff;
 	pccb->datalen = 512;
 	pccb->dma_dir = DMA_FROM_DEVICE;
 	scsi_setup_inquiry(pccb);
 	if (scsi_exec(dev, pccb)) {
 		if (pccb->contr_stat == SCSI_SEL_TIME_OUT) {
 			/*
 			  * selection timeout => assuming no
 			  * device present
 			  */
 			debug("Selection timeout ID %d\n",
 			      pccb->target);
 			return -ETIMEDOUT;
 		}
 		scsi_print_error(pccb);
 		return -ENODEV;
 	}
 	perq = tempbuff[0];
 	modi = tempbuff[1];
 	if ((perq & 0x1f) == 0x1f)
 		return -ENODEV; /* skip unknown devices */
 	if ((modi & 0x80) == 0x80) /* drive is removable */
 		dev_desc->removable = true;
 	/* get info for this device */
 	scsi_ident_cpy((unsigned char *)dev_desc->vendor,
 		       &tempbuff[8], 8);
 	scsi_ident_cpy((unsigned char *)dev_desc->product,
 		       &tempbuff[16], 16);
 	scsi_ident_cpy((unsigned char *)dev_desc->revision,
 		       &tempbuff[32], 4);
 	dev_desc->target = pccb->target;
 	dev_desc->lun = pccb->lun;

 	for (count = 0; count < 3; count++) {
 		pccb->datalen = 0;
 		pccb->dma_dir = DMA_NONE;
 		scsi_setup_test_unit_ready(pccb);
 		err = scsi_exec(dev, pccb);
 		if (!err)
 			break;
 	}
 	if (err) {
 		if (dev_desc->removable) {
 			dev_desc->type = perq;
 			goto removable;
 		}
 		scsi_print_error(pccb);
 		return -EINVAL;
 	}
 	if (scsi_read_capacity(dev, pccb, &capacity, &blksz)) {
 		scsi_print_error(pccb);
 		return -EINVAL;
 	}
 	dev_desc->lba = capacity;
 	dev_desc->blksz = blksz;
 	dev_desc->log2blksz = LOG2(dev_desc->blksz);
 	dev_desc->type = perq;
 removable:
 	return 0;
 }

 /*
  * (re)-scan the scsi bus and reports scsi device info
  * to the user if mode = 1
  */
 static int do_scsi_scan_one(struct udevice *dev, int id, int lun, bool verbose)
 {
 	int ret;
 	struct udevice *bdev;
 	struct blk_desc bd;
 	struct blk_desc *bdesc;
 	char str[10], *name;

 	/*
 	 * detect the scsi driver to get information about its geometry (block
 	 * size, number of blocks) and other parameters (ids, type, ...)
 	 */
 	scsi_init_dev_desc_priv(&bd);
 	if (scsi_detect_dev(dev, id, lun, &bd))
 		return -ENODEV;

 	/*
 	* Create only one block device and do detection
 	* to make sure that there won't be a lot of
 	* block devices created
 	*/
 	snprintf(str, sizeof(str), "id%dlun%d", id, lun);
 	name = strdup(str);
 	if (!name)
 		return log_msg_ret("nam", -ENOMEM);
 	ret = blk_create_devicef(dev, "scsi_blk", name, UCLASS_SCSI, -1,
 				 bd.blksz, bd.lba, &bdev);
 	if (ret) {
 		debug("Can't create device\n");
 		return ret;
 	}
 	device_set_name_alloced(bdev);

 	bdesc = dev_get_uclass_plat(bdev);
 	bdesc->target = id;
 	bdesc->lun = lun;
 	bdesc->removable = bd.removable;
 	bdesc->type = bd.type;
 	bdesc->bb = bd.bb;
 	memcpy(&bdesc->vendor, &bd.vendor, sizeof(bd.vendor));
 	memcpy(&bdesc->product, &bd.product, sizeof(bd.product));
 	memcpy(&bdesc->revision, &bd.revision,	sizeof(bd.revision));
 	if (IS_ENABLED(CONFIG_SYS_BIG_ENDIAN)) {
 		ata_swap_buf_le16((u16 *)&bdesc->vendor, sizeof(bd.vendor) / 2);
 		ata_swap_buf_le16((u16 *)&bdesc->product, sizeof(bd.product) / 2);
 		ata_swap_buf_le16((u16 *)&bdesc->revision, sizeof(bd.revision) / 2);
 	}

 	ret = blk_probe_or_unbind(bdev);
 	if (ret < 0)
 		/* TODO: undo create */
 		return log_msg_ret("pro", ret);

 	ret = bootdev_setup_for_sibling_blk(bdev, "scsi_bootdev");
 	if (ret)
 		return log_msg_ret("bd", ret);

 	if (verbose) {
 		printf("  Device %d: ", bdesc->devnum);
 		dev_print(bdesc);
 	}
 	return 0;
 }

 int scsi_scan_dev(struct udevice *dev, bool verbose)
 {
 	struct scsi_plat *uc_plat; /* scsi controller plat */
 	int ret;
 	int i;
 	int lun;

 	/* probe SCSI controller driver */
 	ret = device_probe(dev);
 	if (ret)
 		return ret;

 	/* Get controller plat */
 	uc_plat = dev_get_uclass_plat(dev);

 	for (i = 0; i < uc_plat->max_id; i++)
 		for (lun = 0; lun < uc_plat->max_lun; lun++)
 			do_scsi_scan_one(dev, i, lun, verbose);

 	return 0;
 }

 int scsi_scan(bool verbose)
 {
 	struct uclass *uc;
 	struct udevice *dev; /* SCSI controller */
 	int ret;

 	if (verbose)
 		printf("scanning bus for devices...\n");

 	ret = uclass_get(UCLASS_SCSI, &uc);
 	if (ret)
 		return ret;

 	/* remove all children of the SCSI devices */
 	uclass_foreach_dev(dev, uc) {
 		log_debug("unbind %s\n", dev->name);
 		ret = device_chld_remove(dev, NULL, DM_REMOVE_NORMAL);
 		if (!ret)
 			ret = device_chld_unbind(dev, NULL);
 		if (ret) {
 			if (verbose)
 				printf("unable to unbind devices (%dE)\n", ret);
 			return log_msg_ret("unb", ret);
 		}
 	}

 	uclass_foreach_dev(dev, uc) {
 		ret = scsi_scan_dev(dev, verbose);
 		if (ret)
 			return ret;
 	}

 	return 0;
 }

 static const struct blk_ops scsi_blk_ops = {
 	.read	= scsi_read,
 	.write	= scsi_write,
 #if IS_ENABLED(CONFIG_BOUNCE_BUFFER)
 	.buffer_aligned	= scsi_buffer_aligned,
 #endif	/* CONFIG_BOUNCE_BUFFER */
 };

 U_BOOT_DRIVER(scsi_blk) = {
 	.name		= "scsi_blk",
 	.id		= UCLASS_BLK,
 	.ops		= &scsi_blk_ops,
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* (C) Copyright 2001
	* Denis Peter, MPL AG Switzerland
	*/

	#define LOG_CATEGORY UCLASS_SCSI

	#include <blk.h>
	#include <bootdev.h>
	#include <bootstage.h>
	#include <dm.h>
	#include <env.h>
	#include <libata.h>
	#include <log.h>
	#include <memalign.h>
	#include <part.h>
	#include <pci.h>
	#include <scsi.h>
	#include <dm/device-internal.h>
	#include <dm/uclass-internal.h>

	static struct scsi_cmd tempccb; /* temporary scsi command buffer */

	DEFINE_CACHE_ALIGN_BUFFER(u8, tempbuff, 512); /* temporary data buffer */

	/* almost the maximum amount of the scsi_ext command.. */
	#define SCSI_MAX_BLK 0xFFFF
	#define SCSI_LBA48_READ 0xFFFFFFF

	static void scsi_print_error(struct scsi_cmd *pccb)
	{
	/* Dummy function that could print an error for debugging */
	}

	#ifdef CONFIG_SYS_64BIT_LBA
	void scsi_setup_read16(struct scsi_cmd *pccb, lbaint_t start,
	unsigned long blocks)
	{
	pccb->cmd[0] = SCSI_READ16;
	pccb->cmd[1] = pccb->lun << 5;
	pccb->cmd[2] = (unsigned char)(start >> 56) & 0xff;
	pccb->cmd[3] = (unsigned char)(start >> 48) & 0xff;
	pccb->cmd[4] = (unsigned char)(start >> 40) & 0xff;
	pccb->cmd[5] = (unsigned char)(start >> 32) & 0xff;
	pccb->cmd[6] = (unsigned char)(start >> 24) & 0xff;
	pccb->cmd[7] = (unsigned char)(start >> 16) & 0xff;
	pccb->cmd[8] = (unsigned char)(start >> 8) & 0xff;
	pccb->cmd[9] = (unsigned char)start & 0xff;
	pccb->cmd[10] = 0;
	pccb->cmd[11] = (unsigned char)(blocks >> 24) & 0xff;
	pccb->cmd[12] = (unsigned char)(blocks >> 16) & 0xff;
	pccb->cmd[13] = (unsigned char)(blocks >> 8) & 0xff;
	pccb->cmd[14] = (unsigned char)blocks & 0xff;
	pccb->cmd[15] = 0;
	pccb->cmdlen = 16;
	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
	debug("scsi_setup_read16: cmd: %02X %02X startblk %02X%02X%02X%02X%02X%02X%02X%02X blccnt %02X%02X%02X%02X\n",
	pccb->cmd[0], pccb->cmd[1],
	pccb->cmd[2], pccb->cmd[3], pccb->cmd[4], pccb->cmd[5],
	pccb->cmd[6], pccb->cmd[7], pccb->cmd[8], pccb->cmd[9],
	pccb->cmd[11], pccb->cmd[12], pccb->cmd[13], pccb->cmd[14]);
	}
	#endif

	static void scsi_setup_inquiry(struct scsi_cmd *pccb)
	{
	pccb->cmd[0] = SCSI_INQUIRY;
	pccb->cmd[1] = pccb->lun << 5;
	pccb->cmd[2] = 0;
	pccb->cmd[3] = 0;
	if (pccb->datalen > 255)
	pccb->cmd[4] = 255;
	else
	pccb->cmd[4] = (unsigned char)pccb->datalen;
	pccb->cmd[5] = 0;
	pccb->cmdlen = 6;
	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
	}

	static void scsi_setup_read_ext(struct scsi_cmd *pccb, lbaint_t start,
	unsigned short blocks)
	{
	pccb->cmd[0] = SCSI_READ10;
	pccb->cmd[1] = pccb->lun << 5;
	pccb->cmd[2] = (unsigned char)(start >> 24) & 0xff;
	pccb->cmd[3] = (unsigned char)(start >> 16) & 0xff;
	pccb->cmd[4] = (unsigned char)(start >> 8) & 0xff;
	pccb->cmd[5] = (unsigned char)start & 0xff;
	pccb->cmd[6] = 0;
	pccb->cmd[7] = (unsigned char)(blocks >> 8) & 0xff;
	pccb->cmd[8] = (unsigned char)blocks & 0xff;
	pccb->cmd[6] = 0;
	pccb->cmdlen = 10;
	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
	debug("scsi_setup_read_ext: cmd: %02X %02X startblk %02X%02X%02X%02X blccnt %02X%02X\n",
	pccb->cmd[0], pccb->cmd[1],
	pccb->cmd[2], pccb->cmd[3], pccb->cmd[4], pccb->cmd[5],
	pccb->cmd[7], pccb->cmd[8]);
	}

	static void scsi_setup_write_ext(struct scsi_cmd *pccb, lbaint_t start,
	unsigned short blocks)
	{
	pccb->cmd[0] = SCSI_WRITE10;
	pccb->cmd[1] = pccb->lun << 5;
	pccb->cmd[2] = (unsigned char)(start >> 24) & 0xff;
	pccb->cmd[3] = (unsigned char)(start >> 16) & 0xff;
	pccb->cmd[4] = (unsigned char)(start >> 8) & 0xff;
	pccb->cmd[5] = (unsigned char)start & 0xff;
	pccb->cmd[6] = 0;
	pccb->cmd[7] = ((unsigned char)(blocks >> 8)) & 0xff;
	pccb->cmd[8] = (unsigned char)blocks & 0xff;
	pccb->cmd[9] = 0;
	pccb->cmdlen = 10;
	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
	debug("%s: cmd: %02X %02X startblk %02X%02X%02X%02X blccnt %02X%02X\n",
	__func__,
	pccb->cmd[0], pccb->cmd[1],
	pccb->cmd[2], pccb->cmd[3], pccb->cmd[4], pccb->cmd[5],
	pccb->cmd[7], pccb->cmd[8]);
	}

	static ulong scsi_read(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
	void *buffer)
	{
	struct blk_desc *block_dev = dev_get_uclass_plat(dev);
	struct udevice *bdev = dev->parent;
	struct scsi_plat *uc_plat = dev_get_uclass_plat(bdev);
	lbaint_t start, blks, max_blks;
	uintptr_t buf_addr;
	unsigned short smallblks = 0;
	struct scsi_cmd pccb = (struct scsi_cmd )&tempccb;

	/* Setup device */
	pccb->target = block_dev->target;
	pccb->lun = block_dev->lun;
	buf_addr = (unsigned long)buffer;
	start = blknr;
	blks = blkcnt;
	if (uc_plat->max_bytes_per_req)
	max_blks = uc_plat->max_bytes_per_req / block_dev->blksz;
	else
	max_blks = SCSI_MAX_BLK;

	debug("\nscsi_read: dev %d startblk " LBAF
	", blccnt " LBAF " buffer %lx\n",
	block_dev->devnum, start, blks, (unsigned long)buffer);
	do {
	pccb->pdata = (unsigned char *)buf_addr;
	pccb->dma_dir = DMA_FROM_DEVICE;
	#ifdef CONFIG_SYS_64BIT_LBA
	if (start > SCSI_LBA48_READ) {
	unsigned long blocks;
	blocks = min_t(lbaint_t, blks, max_blks);
	pccb->datalen = block_dev->blksz * blocks;
	scsi_setup_read16(pccb, start, blocks);
	start += blocks;
	blks -= blocks;
	} else
	#endif
	if (blks > max_blks) {
	pccb->datalen = block_dev->blksz * max_blks;
	smallblks = max_blks;
	scsi_setup_read_ext(pccb, start, smallblks);
	start += max_blks;
	blks -= max_blks;
	} else {
	pccb->datalen = block_dev->blksz * blks;
	smallblks = (unsigned short)blks;
	scsi_setup_read_ext(pccb, start, smallblks);
	start += blks;
	blks = 0;
	}
	debug("scsi_read_ext: startblk " LBAF
	", blccnt %x buffer %lX\n",
	start, smallblks, buf_addr);
	if (scsi_exec(bdev, pccb)) {
	scsi_print_error(pccb);
	blkcnt -= blks;
	break;
	}
	buf_addr += pccb->datalen;
	} while (blks != 0);
	debug("scsi_read_ext: end startblk " LBAF
	", blccnt %x buffer %lX\n", start, smallblks, buf_addr);
	return blkcnt;
	}

	/*******************************************************************************
	* scsi_write
	*/

	static ulong scsi_write(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
	const void *buffer)
	{
	struct blk_desc *block_dev = dev_get_uclass_plat(dev);
	struct udevice *bdev = dev->parent;
	struct scsi_plat *uc_plat = dev_get_uclass_plat(bdev);
	lbaint_t start, blks, max_blks;
	uintptr_t buf_addr;
	unsigned short smallblks;
	struct scsi_cmd pccb = (struct scsi_cmd )&tempccb;

	/* Setup device */
	pccb->target = block_dev->target;
	pccb->lun = block_dev->lun;
	buf_addr = (unsigned long)buffer;
	start = blknr;
	blks = blkcnt;
	if (uc_plat->max_bytes_per_req)
	max_blks = uc_plat->max_bytes_per_req / block_dev->blksz;
	else
	max_blks = SCSI_MAX_BLK;

	debug("\n%s: dev %d startblk " LBAF ", blccnt " LBAF " buffer %lx\n",
	__func__, block_dev->devnum, start, blks, (unsigned long)buffer);
	do {
	pccb->pdata = (unsigned char *)buf_addr;
	pccb->dma_dir = DMA_TO_DEVICE;
	if (blks > max_blks) {
	pccb->datalen = block_dev->blksz * max_blks;
	smallblks = max_blks;
	scsi_setup_write_ext(pccb, start, smallblks);
	start += max_blks;
	blks -= max_blks;
	} else {
	pccb->datalen = block_dev->blksz * blks;
	smallblks = (unsigned short)blks;
	scsi_setup_write_ext(pccb, start, smallblks);
	start += blks;
	blks = 0;
	}
	debug("%s: startblk " LBAF ", blccnt %x buffer %lx\n",
	__func__, start, smallblks, buf_addr);
	if (scsi_exec(bdev, pccb)) {
	scsi_print_error(pccb);
	blkcnt -= blks;
	break;
	}
	buf_addr += pccb->datalen;
	} while (blks != 0);
	debug("%s: end startblk " LBAF ", blccnt %x buffer %lX\n",
	__func__, start, smallblks, buf_addr);
	return blkcnt;
	}

	#if IS_ENABLED(CONFIG_BOUNCE_BUFFER)
	static int scsi_buffer_aligned(struct udevice dev, struct bounce_buffer state)
	{
	struct scsi_ops *ops = scsi_get_ops(dev->parent);

	if (ops->buffer_aligned)
	return ops->buffer_aligned(dev->parent, state);

	return 1;
	}
	#endif /* CONFIG_BOUNCE_BUFFER */

	/* copy src to dest, skipping leading and trailing blanks
	* and null terminate the string
	*/
	static void scsi_ident_cpy(unsigned char dest, unsigned char src,
	unsigned int len)
	{
	int start, end;

	start = 0;
	while (start < len) {
	if (src[start] != ' ')
	break;
	start++;
	}
	end = len-1;
	while (end > start) {
	if (src[end] != ' ')
	break;
	end--;
	}
	for (; start <= end; start++)
	*dest ++= src[start];
	*dest = '\0';
	}

	static int scsi_read_capacity(struct udevice dev, struct scsi_cmd pccb,
	lbaint_t capacity, unsigned long blksz)
	{
	*capacity = 0;

	memset(pccb->cmd, '\0', sizeof(pccb->cmd));
	pccb->cmd[0] = SCSI_RD_CAPAC10;
	pccb->cmd[1] = pccb->lun << 5;
	pccb->cmdlen = 10;
	pccb->dma_dir = DMA_FROM_DEVICE;
	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */

	pccb->datalen = 8;
	if (scsi_exec(dev, pccb))
	return 1;

	*capacity = ((lbaint_t)pccb->pdata[0] << 24) \|
	((lbaint_t)pccb->pdata[1] << 16) \|
	((lbaint_t)pccb->pdata[2] << 8) \|
	((lbaint_t)pccb->pdata[3]);

	if (*capacity != 0xffffffff) {
	/* Read capacity (10) was sufficient for this drive. */
	*blksz = ((unsigned long)pccb->pdata[4] << 24) \|
	((unsigned long)pccb->pdata[5] << 16) \|
	((unsigned long)pccb->pdata[6] << 8) \|
	((unsigned long)pccb->pdata[7]);
	return 0;
	}

	/* Read capacity (10) was insufficient. Use read capacity (16). */
	memset(pccb->cmd, '\0', sizeof(pccb->cmd));
	pccb->cmd[0] = SCSI_RD_CAPAC16;
	pccb->cmd[1] = 0x10;
	pccb->cmdlen = 16;
	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */

	pccb->datalen = 16;
	pccb->dma_dir = DMA_FROM_DEVICE;
	if (scsi_exec(dev, pccb))
	return 1;

	*capacity = ((uint64_t)pccb->pdata[0] << 56) \|
	((uint64_t)pccb->pdata[1] << 48) \|
	((uint64_t)pccb->pdata[2] << 40) \|
	((uint64_t)pccb->pdata[3] << 32) \|
	((uint64_t)pccb->pdata[4] << 24) \|
	((uint64_t)pccb->pdata[5] << 16) \|
	((uint64_t)pccb->pdata[6] << 8) \|
	((uint64_t)pccb->pdata[7]);

	*blksz = ((uint64_t)pccb->pdata[8] << 56) \|
	((uint64_t)pccb->pdata[9] << 48) \|
	((uint64_t)pccb->pdata[10] << 40) \|
	((uint64_t)pccb->pdata[11] << 32) \|
	((uint64_t)pccb->pdata[12] << 24) \|
	((uint64_t)pccb->pdata[13] << 16) \|
	((uint64_t)pccb->pdata[14] << 8) \|
	((uint64_t)pccb->pdata[15]);

	return 0;
	}

	/*
	* Some setup (fill-in) routines
	*/
	static void scsi_setup_test_unit_ready(struct scsi_cmd *pccb)
	{
	pccb->cmd[0] = SCSI_TST_U_RDY;
	pccb->cmd[1] = pccb->lun << 5;
	pccb->cmd[2] = 0;
	pccb->cmd[3] = 0;
	pccb->cmd[4] = 0;
	pccb->cmd[5] = 0;
	pccb->cmdlen = 6;
	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
	}

	/**
	* scsi_init_dev_desc_priv - initialize only SCSI specific blk_desc properties
	*
	* @dev_desc: Block device description pointer
	*/
	static void scsi_init_dev_desc_priv(struct blk_desc *dev_desc)
	{
	memset(dev_desc, 0, sizeof(struct blk_desc));
	dev_desc->target = 0xff;
	dev_desc->lun = 0xff;
	dev_desc->log2blksz =
	LOG2_INVALID(typeof(dev_desc->log2blksz));
	dev_desc->type = DEV_TYPE_UNKNOWN;
	#if IS_ENABLED(CONFIG_BOUNCE_BUFFER)
	dev_desc->bb = true;
	#endif /* CONFIG_BOUNCE_BUFFER */
	}

	/**
	* scsi_detect_dev - Detect scsi device
	*
	* @target: target id
	* @lun: target lun
	* @dev_desc: block device description
	*
	* The scsi_detect_dev detects and fills a dev_desc structure when the device is
	* detected.
	*
	* Return: 0 on success, error value otherwise
	*/
	static int scsi_detect_dev(struct udevice *dev, int target, int lun,
	struct blk_desc *dev_desc)
	{
	unsigned char perq, modi;
	lbaint_t capacity;
	unsigned long blksz;
	struct scsi_cmd pccb = (struct scsi_cmd )&tempccb;
	int count, err;

	pccb->target = target;
	pccb->lun = lun;
	pccb->pdata = tempbuff;
	pccb->datalen = 512;
	pccb->dma_dir = DMA_FROM_DEVICE;
	scsi_setup_inquiry(pccb);
	if (scsi_exec(dev, pccb)) {
	if (pccb->contr_stat == SCSI_SEL_TIME_OUT) {
	/*
	* selection timeout => assuming no
	* device present
	*/
	debug("Selection timeout ID %d\n",
	pccb->target);
	return -ETIMEDOUT;
	}
	scsi_print_error(pccb);
	return -ENODEV;
	}
	perq = tempbuff[0];
	modi = tempbuff[1];
	if ((perq & 0x1f) == 0x1f)
	return -ENODEV; /* skip unknown devices */
	if ((modi & 0x80) == 0x80) /* drive is removable */
	dev_desc->removable = true;
	/* get info for this device */
	scsi_ident_cpy((unsigned char *)dev_desc->vendor,
	&tempbuff[8], 8);
	scsi_ident_cpy((unsigned char *)dev_desc->product,
	&tempbuff[16], 16);
	scsi_ident_cpy((unsigned char *)dev_desc->revision,
	&tempbuff[32], 4);
	dev_desc->target = pccb->target;
	dev_desc->lun = pccb->lun;

	for (count = 0; count < 3; count++) {
	pccb->datalen = 0;
	pccb->dma_dir = DMA_NONE;
	scsi_setup_test_unit_ready(pccb);
	err = scsi_exec(dev, pccb);
	if (!err)
	break;
	}
	if (err) {
	if (dev_desc->removable) {
	dev_desc->type = perq;
	goto removable;
	}
	scsi_print_error(pccb);
	return -EINVAL;
	}
	if (scsi_read_capacity(dev, pccb, &capacity, &blksz)) {
	scsi_print_error(pccb);
	return -EINVAL;
	}
	dev_desc->lba = capacity;
	dev_desc->blksz = blksz;
	dev_desc->log2blksz = LOG2(dev_desc->blksz);
	dev_desc->type = perq;
	removable:
	return 0;
	}

	/*
	* (re)-scan the scsi bus and reports scsi device info
	* to the user if mode = 1
	*/
	static int do_scsi_scan_one(struct udevice *dev, int id, int lun, bool verbose)
	{
	int ret;
	struct udevice *bdev;
	struct blk_desc bd;
	struct blk_desc *bdesc;
	char str[10], *name;

	/*
	* detect the scsi driver to get information about its geometry (block
	* size, number of blocks) and other parameters (ids, type, ...)
	*/
	scsi_init_dev_desc_priv(&bd);
	if (scsi_detect_dev(dev, id, lun, &bd))
	return -ENODEV;

	/*
	* Create only one block device and do detection
	* to make sure that there won't be a lot of
	* block devices created
	*/
	snprintf(str, sizeof(str), "id%dlun%d", id, lun);
	name = strdup(str);
	if (!name)
	return log_msg_ret("nam", -ENOMEM);
	ret = blk_create_devicef(dev, "scsi_blk", name, UCLASS_SCSI, -1,
	bd.blksz, bd.lba, &bdev);
	if (ret) {
	debug("Can't create device\n");
	return ret;
	}
	device_set_name_alloced(bdev);

	bdesc = dev_get_uclass_plat(bdev);
	bdesc->target = id;
	bdesc->lun = lun;
	bdesc->removable = bd.removable;
	bdesc->type = bd.type;
	bdesc->bb = bd.bb;
	memcpy(&bdesc->vendor, &bd.vendor, sizeof(bd.vendor));
	memcpy(&bdesc->product, &bd.product, sizeof(bd.product));
	memcpy(&bdesc->revision, &bd.revision, sizeof(bd.revision));
	if (IS_ENABLED(CONFIG_SYS_BIG_ENDIAN)) {
	ata_swap_buf_le16((u16 *)&bdesc->vendor, sizeof(bd.vendor) / 2);
	ata_swap_buf_le16((u16 *)&bdesc->product, sizeof(bd.product) / 2);
	ata_swap_buf_le16((u16 *)&bdesc->revision, sizeof(bd.revision) / 2);
	}

	ret = blk_probe_or_unbind(bdev);
	if (ret < 0)
	/* TODO: undo create */
	return log_msg_ret("pro", ret);

	ret = bootdev_setup_for_sibling_blk(bdev, "scsi_bootdev");
	if (ret)
	return log_msg_ret("bd", ret);

	if (verbose) {
	printf(" Device %d: ", bdesc->devnum);
	dev_print(bdesc);
	}
	return 0;
	}

	int scsi_scan_dev(struct udevice *dev, bool verbose)
	{
	struct scsi_plat uc_plat; / scsi controller plat */
	int ret;
	int i;
	int lun;

	/* probe SCSI controller driver */
	ret = device_probe(dev);
	if (ret)
	return ret;

	/* Get controller plat */
	uc_plat = dev_get_uclass_plat(dev);

	for (i = 0; i < uc_plat->max_id; i++)
	for (lun = 0; lun < uc_plat->max_lun; lun++)
	do_scsi_scan_one(dev, i, lun, verbose);

	return 0;
	}

	int scsi_scan(bool verbose)
	{
	struct uclass *uc;
	struct udevice dev; / SCSI controller */
	int ret;

	if (verbose)
	printf("scanning bus for devices...\n");

	ret = uclass_get(UCLASS_SCSI, &uc);
	if (ret)
	return ret;

	/* remove all children of the SCSI devices */
	uclass_foreach_dev(dev, uc) {
	log_debug("unbind %s\n", dev->name);
	ret = device_chld_remove(dev, NULL, DM_REMOVE_NORMAL);
	if (!ret)
	ret = device_chld_unbind(dev, NULL);
	if (ret) {
	if (verbose)
	printf("unable to unbind devices (%dE)\n", ret);
	return log_msg_ret("unb", ret);
	}
	}

	uclass_foreach_dev(dev, uc) {
	ret = scsi_scan_dev(dev, verbose);
	if (ret)
	return ret;
	}

	return 0;
	}

	static const struct blk_ops scsi_blk_ops = {
	.read = scsi_read,
	.write = scsi_write,
	#if IS_ENABLED(CONFIG_BOUNCE_BUFFER)
	.buffer_aligned = scsi_buffer_aligned,
	#endif /* CONFIG_BOUNCE_BUFFER */
	};

	U_BOOT_DRIVER(scsi_blk) = {
	.name = "scsi_blk",
	.id = UCLASS_BLK,
	.ops = &scsi_blk_ops,
	};