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Release 4.11 drivers/scsi/wd719x.c

Directory: drivers/scsi
/*
 * Driver for Western Digital WD7193, WD7197 and WD7296 SCSI cards
 * Copyright 2013 Ondrej Zary
 *
 * Original driver by
 * Aaron Dewell <dewell@woods.net>
 * Gaerti <Juergen.Gaertner@mbox.si.uni-hannover.de>
 *
 * HW documentation available in book:
 *
 * SPIDER Command Protocol
 * by Chandru M. Sippy
 * SCSI Storage Products (MCP)
 * Western Digital Corporation
 * 09-15-95
 *
 * http://web.archive.org/web/20070717175254/http://sun1.rrzn.uni-hannover.de/gaertner.juergen/wd719x/Linux/Docu/Spider/
 */

/*
 * Driver workflow:
 * 1. SCSI command is transformed to SCB (Spider Control Block) by the
 *    queuecommand function.
 * 2. The address of the SCB is stored in a list to be able to access it, if
 *    something goes wrong.
 * 3. The address of the SCB is written to the Controller, which loads the SCB
 *    via BM-DMA and processes it.
 * 4. After it has finished, it generates an interrupt, and sets registers.
 *
 * flaws:
 *  - abort/reset functions
 *
 * ToDo:
 *  - tagged queueing
 */

#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/firmware.h>
#include <linux/eeprom_93cx6.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include "wd719x.h"

/* low-level register access */



static inline u8 wd719x_readb(struct wd719x *wd, u8 reg)
{
	return ioread8(wd->base + reg);
}


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static inline u32 wd719x_readl(struct wd719x *wd, u8 reg)
{
	return ioread32(wd->base + reg);
}


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static inline void wd719x_writeb(struct wd719x *wd, u8 reg, u8 val)
{
	iowrite8(val, wd->base + reg);
}


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static inline void wd719x_writew(struct wd719x *wd, u8 reg, u16 val)
{
	iowrite16(val, wd->base + reg);
}


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static inline void wd719x_writel(struct wd719x *wd, u8 reg, u32 val)
{
	iowrite32(val, wd->base + reg);
}


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/* wait until the command register is ready */



static inline int wd719x_wait_ready(struct wd719x *wd)
{
	int i = 0;

	do {
		if (wd719x_readb(wd, WD719X_AMR_COMMAND) == WD719X_CMD_READY)
			return 0;
		udelay(1);
	} while (i++ < WD719X_WAIT_FOR_CMD_READY);

	dev_err(&wd->pdev->dev, "command register is not ready: 0x%02x\n",
		wd719x_readb(wd, WD719X_AMR_COMMAND));

	return -ETIMEDOUT;
}


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/* poll interrupt status register until command finishes */



static inline int wd719x_wait_done(struct wd719x *wd, int timeout)
{
	u8 status;

	while (timeout > 0) {
		status = wd719x_readb(wd, WD719X_AMR_INT_STATUS);
		if (status)
			break;
		timeout--;
		udelay(1);
	}

	if (timeout <= 0) {
		dev_err(&wd->pdev->dev, "direct command timed out\n");
		return -ETIMEDOUT;
	}

	if (status != WD719X_INT_NOERRORS) {
		dev_err(&wd->pdev->dev, "direct command failed, status 0x%02x, SUE 0x%02x\n",
			status, wd719x_readb(wd, WD719X_AMR_SCB_ERROR));
		return -EIO;
	}

	return 0;
}


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static int wd719x_direct_cmd(struct wd719x *wd, u8 opcode, u8 dev, u8 lun,
			     u8 tag, dma_addr_t data, int timeout)
{
	int ret = 0;

	/* clear interrupt status register (allow command register to clear) */
	wd719x_writeb(wd, WD719X_AMR_INT_STATUS, WD719X_INT_NONE);

	/* Wait for the Command register to become free */
	if (wd719x_wait_ready(wd))
		return -ETIMEDOUT;

	/* make sure we get NO interrupts */
	dev |= WD719X_DISABLE_INT;
	wd719x_writeb(wd, WD719X_AMR_CMD_PARAM, dev);
	wd719x_writeb(wd, WD719X_AMR_CMD_PARAM_2, lun);
	wd719x_writeb(wd, WD719X_AMR_CMD_PARAM_3, tag);
	if (data)
		wd719x_writel(wd, WD719X_AMR_SCB_IN, data);

	/* clear interrupt status register again */
	wd719x_writeb(wd, WD719X_AMR_INT_STATUS, WD719X_INT_NONE);

	/* Now, write the command */
	wd719x_writeb(wd, WD719X_AMR_COMMAND, opcode);

	if (timeout)	/* wait for the command to complete */
		ret = wd719x_wait_done(wd, timeout);

	/* clear interrupt status register (clean up) */
	if (opcode != WD719X_CMD_READ_FIRMVER)
		wd719x_writeb(wd, WD719X_AMR_INT_STATUS, WD719X_INT_NONE);

	return ret;
}


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static void wd719x_destroy(struct wd719x *wd)
{
	struct wd719x_scb *scb;

	/* stop the RISC */
	if (wd719x_direct_cmd(wd, WD719X_CMD_SLEEP, 0, 0, 0, 0,
			      WD719X_WAIT_FOR_RISC))
		dev_warn(&wd->pdev->dev, "RISC sleep command failed\n");
	/* disable RISC */
	wd719x_writeb(wd, WD719X_PCI_MODE_SELECT, 0);

	/* free all SCBs */
	list_for_each_entry(scb, &wd->active_scbs, list)
		pci_free_consistent(wd->pdev, sizeof(struct wd719x_scb), scb,
				    scb->phys);
	list_for_each_entry(scb, &wd->free_scbs, list)
		pci_free_consistent(wd->pdev, sizeof(struct wd719x_scb), scb,
				    scb->phys);
	/* free internal buffers */
	pci_free_consistent(wd->pdev, wd->fw_size, wd->fw_virt, wd->fw_phys);
	wd->fw_virt = NULL;
	pci_free_consistent(wd->pdev, WD719X_HASH_TABLE_SIZE, wd->hash_virt,
			    wd->hash_phys);
	wd->hash_virt = NULL;
	pci_free_consistent(wd->pdev, sizeof(struct wd719x_host_param),
			    wd->params, wd->params_phys);
	wd->params = NULL;
	free_irq(wd->pdev->irq, wd);
}


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/* finish a SCSI command, mark SCB (if any) as free, unmap buffers */



static void wd719x_finish_cmd(struct scsi_cmnd *cmd, int result)
{
	struct wd719x *wd = shost_priv(cmd->device->host);
	struct wd719x_scb *scb = (struct wd719x_scb *) cmd->host_scribble;

	if (scb) {
		list_move(&scb->list, &wd->free_scbs);
		dma_unmap_single(&wd->pdev->dev, cmd->SCp.dma_handle,
				 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
		scsi_dma_unmap(cmd);
	}
	cmd->result = result << 16;
	cmd->scsi_done(cmd);
}


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/* Build a SCB and send it to the card */



static int wd719x_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
{
	int i, count_sg;
	unsigned long flags;
	struct wd719x_scb *scb;
	struct wd719x *wd = shost_priv(sh);
	dma_addr_t phys;

	cmd->host_scribble = NULL;

	/* get a free SCB - either from existing ones or allocate a new one */
	spin_lock_irqsave(wd->sh->host_lock, flags);
	scb = list_first_entry_or_null(&wd->free_scbs, struct wd719x_scb, list);
	if (scb) {
		list_del(&scb->list);
		phys = scb->phys;
	} else {
		spin_unlock_irqrestore(wd->sh->host_lock, flags);
		scb = pci_alloc_consistent(wd->pdev, sizeof(struct wd719x_scb),
					   &phys);
		spin_lock_irqsave(wd->sh->host_lock, flags);
		if (!scb) {
			dev_err(&wd->pdev->dev, "unable to allocate SCB\n");
			wd719x_finish_cmd(cmd, DID_ERROR);
			spin_unlock_irqrestore(wd->sh->host_lock, flags);
			return 0;
		}
	}
	memset(scb, 0, sizeof(struct wd719x_scb));
	list_add(&scb->list, &wd->active_scbs);

	scb->phys = phys;
	scb->cmd = cmd;
	cmd->host_scribble = (char *) scb;

	scb->CDB_tag = 0;	/* Tagged queueing not supported yet */
	scb->devid = cmd->device->id;
	scb->lun = cmd->device->lun;

	/* copy the command */
	memcpy(scb->CDB, cmd->cmnd, cmd->cmd_len);

	/* map sense buffer */
	scb->sense_buf_length = SCSI_SENSE_BUFFERSIZE;
	cmd->SCp.dma_handle = dma_map_single(&wd->pdev->dev, cmd->sense_buffer,
			SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
	scb->sense_buf = cpu_to_le32(cmd->SCp.dma_handle);

	/* request autosense */
	scb->SCB_options |= WD719X_SCB_FLAGS_AUTO_REQUEST_SENSE;

	/* check direction */
	if (cmd->sc_data_direction == DMA_TO_DEVICE)
		scb->SCB_options |= WD719X_SCB_FLAGS_CHECK_DIRECTION
				 |  WD719X_SCB_FLAGS_PCI_TO_SCSI;
	else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
		scb->SCB_options |= WD719X_SCB_FLAGS_CHECK_DIRECTION;

	/* Scather/gather */
	count_sg = scsi_dma_map(cmd);
	if (count_sg < 0) {
		wd719x_finish_cmd(cmd, DID_ERROR);
		spin_unlock_irqrestore(wd->sh->host_lock, flags);
		return 0;
	}
	BUG_ON(count_sg > WD719X_SG);

	if (count_sg) {
		struct scatterlist *sg;

		scb->data_length = cpu_to_le32(count_sg *
					       sizeof(struct wd719x_sglist));
		scb->data_p = cpu_to_le32(scb->phys +
					  offsetof(struct wd719x_scb, sg_list));

		scsi_for_each_sg(cmd, sg, count_sg, i) {
			scb->sg_list[i].ptr = cpu_to_le32(sg_dma_address(sg));
			scb->sg_list[i].length = cpu_to_le32(sg_dma_len(sg));
		}
		scb->SCB_options |= WD719X_SCB_FLAGS_DO_SCATTER_GATHER;
	} else { /* zero length */
		scb->data_length = 0;
		scb->data_p = 0;
	}

	/* check if the Command register is free */
	if (wd719x_readb(wd, WD719X_AMR_COMMAND) != WD719X_CMD_READY) {
		spin_unlock_irqrestore(wd->sh->host_lock, flags);
		return SCSI_MLQUEUE_HOST_BUSY;
	}

	/* write pointer to the AMR */
	wd719x_writel(wd, WD719X_AMR_SCB_IN, scb->phys);
	/* send SCB opcode */
	wd719x_writeb(wd, WD719X_AMR_COMMAND, WD719X_CMD_PROCESS_SCB);

	spin_unlock_irqrestore(wd->sh->host_lock, flags);

	return 0;
}


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static int wd719x_chip_init(struct wd719x *wd)
{
	int i, ret;
	u32 risc_init[3];
	const struct firmware *fw_wcs, *fw_risc;
	const char fwname_wcs[] = "wd719x-wcs.bin";
	const char fwname_risc[] = "wd719x-risc.bin";

	memset(wd->hash_virt, 0, WD719X_HASH_TABLE_SIZE);

	/* WCS (sequencer) firmware */
	ret = request_firmware(&fw_wcs, fwname_wcs, &wd->pdev->dev);
	if (ret) {
		dev_err(&wd->pdev->dev, "Unable to load firmware %s: %d\n",
			fwname_wcs, ret);
		return ret;
	}
	/* RISC firmware */
	ret = request_firmware(&fw_risc, fwname_risc, &wd->pdev->dev);
	if (ret) {
		dev_err(&wd->pdev->dev, "Unable to load firmware %s: %d\n",
			fwname_risc, ret);
		release_firmware(fw_wcs);
		return ret;
	}
	wd->fw_size = ALIGN(fw_wcs->size, 4) + fw_risc->size;

	if (!wd->fw_virt)
		wd->fw_virt = pci_alloc_consistent(wd->pdev, wd->fw_size,
						   &wd->fw_phys);
	if (!wd->fw_virt) {
		ret = -ENOMEM;
		goto wd719x_init_end;
	}

	/* make a fresh copy of WCS and RISC code */
	memcpy(wd->fw_virt, fw_wcs->data, fw_wcs->size);
	memcpy(wd->fw_virt + ALIGN(fw_wcs->size, 4), fw_risc->data,
		fw_risc->size);

	/* Reset the Spider Chip and adapter itself */
	wd719x_writeb(wd, WD719X_PCI_PORT_RESET, WD719X_PCI_RESET);
	udelay(WD719X_WAIT_FOR_RISC);
	/* Clear PIO mode bits set by BIOS */
	wd719x_writeb(wd, WD719X_AMR_CMD_PARAM, 0);
	/* ensure RISC is not running */
	wd719x_writeb(wd, WD719X_PCI_MODE_SELECT, 0);
	/* ensure command port is ready */
	wd719x_writeb(wd, WD719X_AMR_COMMAND, 0);
	if (wd719x_wait_ready(wd)) {
		ret = -ETIMEDOUT;
		goto wd719x_init_end;
	}

	/* Transfer the first 2K words of RISC code to kick start the uP */
	risc_init[0] = wd->fw_phys;				/* WCS FW */
	risc_init[1] = wd->fw_phys + ALIGN(fw_wcs->size, 4);	/* RISC FW */
	risc_init[2] = wd->hash_phys;				/* hash table */

	/* clear DMA status */
	wd719x_writeb(wd, WD719X_PCI_CHANNEL2_3STATUS, 0);

	/* address to read firmware from */
	wd719x_writel(wd, WD719X_PCI_EXTERNAL_ADDR, risc_init[1]);
	/* base address to write firmware to (on card) */
	wd719x_writew(wd, WD719X_PCI_INTERNAL_ADDR, WD719X_PRAM_BASE_ADDR);
	/* size: first 2K words */
	wd719x_writew(wd, WD719X_PCI_DMA_TRANSFER_SIZE, 2048 * 2);
	/* start DMA */
	wd719x_writeb(wd, WD719X_PCI_CHANNEL2_3CMD, WD719X_START_CHANNEL2_3DMA);

	/* wait for DMA to complete */
	i = WD719X_WAIT_FOR_RISC;
	while (i-- > 0) {
		u8 status = wd719x_readb(wd, WD719X_PCI_CHANNEL2_3STATUS);
		if (status == WD719X_START_CHANNEL2_3DONE)
			break;
		if (status == WD719X_START_CHANNEL2_3ABORT) {
			dev_warn(&wd->pdev->dev, "RISC bootstrap failed: DMA aborted\n");
			ret = -EIO;
			goto wd719x_init_end;
		}
		udelay(1);
	}
	if (i < 1) {
		dev_warn(&wd->pdev->dev, "RISC bootstrap failed: DMA timeout\n");
		ret = -ETIMEDOUT;
		goto wd719x_init_end;
	}

	/* firmware is loaded, now initialize and wake up the RISC */
	/* write RISC initialization long words to Spider */
	wd719x_writel(wd, WD719X_AMR_SCB_IN, risc_init[0]);
	wd719x_writel(wd, WD719X_AMR_SCB_IN + 4, risc_init[1]);
	wd719x_writel(wd, WD719X_AMR_SCB_IN + 8, risc_init[2]);

	/* disable interrupts during initialization of RISC */
	wd719x_writeb(wd, WD719X_AMR_CMD_PARAM, WD719X_DISABLE_INT);

	/* issue INITIALIZE RISC comand */
	wd719x_writeb(wd, WD719X_AMR_COMMAND, WD719X_CMD_INIT_RISC);
	/* enable advanced mode (wake up RISC) */
	wd719x_writeb(wd, WD719X_PCI_MODE_SELECT, WD719X_ENABLE_ADVANCE_MODE);
	udelay(WD719X_WAIT_FOR_RISC);

	ret = wd719x_wait_done(wd, WD719X_WAIT_FOR_RISC);
	/* clear interrupt status register */
	wd719x_writeb(wd, WD719X_AMR_INT_STATUS, WD719X_INT_NONE);
	if (ret) {
		dev_warn(&wd->pdev->dev, "Unable to initialize RISC\n");
		goto wd719x_init_end;
	}
	/* RISC is up and running */

	/* Read FW version from RISC */
	ret = wd719x_direct_cmd(wd, WD719X_CMD_READ_FIRMVER, 0, 0, 0, 0,
				WD719X_WAIT_FOR_RISC);
	if (ret) {
		dev_warn(&wd->pdev->dev, "Unable to read firmware version\n");
		goto wd719x_init_end;
	}
	dev_info(&wd->pdev->dev, "RISC initialized with firmware version %.2x.%.2x\n",
			wd719x_readb(wd, WD719X_AMR_SCB_OUT + 1),
			wd719x_readb(wd, WD719X_AMR_SCB_OUT));

	/* RESET SCSI bus */
	ret = wd719x_direct_cmd(wd, WD719X_CMD_BUSRESET, 0, 0, 0, 0,
				WD719X_WAIT_FOR_SCSI_RESET);
	if (ret) {
		dev_warn(&wd->pdev->dev, "SCSI bus reset failed\n");
		goto wd719x_init_end;
	}

	/* use HostParameter structure to set Spider's Host Parameter Block */
	ret = wd719x_direct_cmd(wd, WD719X_CMD_SET_PARAM, 0,
				sizeof(struct wd719x_host_param), 0,
				wd->params_phys, WD719X_WAIT_FOR_RISC);
	if (ret) {
		dev_warn(&wd->pdev->dev, "Failed to set HOST PARAMETERS\n");
		goto wd719x_init_end;
	}

	/* initiate SCAM (does nothing if disabled in BIOS) */
	/* bug?: we should pass a mask of static IDs which we don't have */
	ret = wd719x_direct_cmd(wd, WD719X_CMD_INIT_SCAM, 0, 0, 0, 0,
				WD719X_WAIT_FOR_SCSI_RESET);
	if (ret) {
		dev_warn(&wd->pdev->dev, "SCAM initialization failed\n");
		goto wd719x_init_end;
	}

	/* clear AMR_BIOS_SHARE_INT register */
	wd719x_writeb(wd, WD719X_AMR_BIOS_SHARE_INT, 0);

wd719x_init_end:
	release_firmware(fw_wcs);
	release_firmware(fw_risc);

	return ret;
}


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static int wd719x_abort(struct scsi_cmnd *cmd)
{
	int action, result;
	unsigned long flags;
	struct wd719x_scb *scb = (struct wd719x_scb *)cmd->host_scribble;
	struct wd719x *wd = shost_priv(cmd->device->host);

	dev_info(&wd->pdev->dev, "abort command, tag: %x\n", cmd->tag);

	action = /*cmd->tag ? WD719X_CMD_ABORT_TAG : */WD719X_CMD_ABORT;

	spin_lock_irqsave(wd->sh->host_lock, flags);
	result = wd719x_direct_cmd(wd, action, cmd->device->id,
				   cmd->device->lun, cmd->tag, scb->phys, 0);
	spin_unlock_irqrestore(wd->sh->host_lock, flags);
	if (result)
		return FAILED;

	return SUCCESS;
}


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static int wd719x_reset(struct scsi_cmnd *cmd, u8 opcode, u8 device)
{
	int result;
	unsigned long flags;
	struct wd719x *wd = shost_priv(cmd->device->host);

	dev_info(&wd->pdev->dev, "%s reset requested\n",
		 (opcode == WD719X_CMD_BUSRESET) ? "bus" : "device");

	spin_lock_irqsave(wd->sh->host_lock, flags);
	result = wd719x_direct_cmd(wd, opcode, device, 0, 0, 0,
				   WD719X_WAIT_FOR_SCSI_RESET);
	spin_unlock_irqrestore(wd->sh->host_lock, flags);
	if (result)
		return FAILED;

	return SUCCESS;
}


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static int wd719x_dev_reset(struct scsi_cmnd *cmd)
{
	return wd719x_reset(cmd, WD719X_CMD_RESET, cmd->device->id);
}


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static int wd719x_bus_reset(struct scsi_cmnd *cmd)
{
	return wd719x_reset(cmd, WD719X_CMD_BUSRESET, 0);
}


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static int wd719x_host_reset(struct scsi_cmnd *cmd)
{
	struct wd719x *wd = shost_priv(cmd->device->host);
	struct wd719x_scb *scb, *tmp;
	unsigned long flags;
	int result;

	dev_info(&wd->pdev->dev, "host reset requested\n");
	spin_lock_irqsave(wd->sh->host_lock, flags);
	/* Try to reinit the RISC */
	if (wd719x_chip_init(wd) == 0)
		result = SUCCESS;
	else
		result = FAILED;

	/* flush all SCBs */
	list_for_each_entry_safe(scb, tmp, &wd->active_scbs, list) {
		struct scsi_cmnd *tmp_cmd = scb->cmd;
		wd719x_finish_cmd(tmp_cmd, result);
	}
	spin_unlock_irqrestore(wd->sh->host_lock, flags);

	return result;
}


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static int wd719x_biosparam(struct scsi_device *sdev, struct block_device *bdev,
			    sector_t capacity, int geom[])
{
	if (capacity >= 0x200000) {
		geom[0] = 255;	/* heads */
		geom[1] = 63;	/* sectors */
	} else {
		geom[0] = 64;	/* heads */
		geom[1] = 32;	/* sectors */
	}
	geom[2] = sector_div(capacity, geom[0] * geom[1]);	/* cylinders */

	return 0;
}


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/* process a SCB-completion interrupt */



static inline void wd719x_interrupt_SCB(struct wd719x *wd,
					union wd719x_regs regs,
					struct wd719x_scb *scb)
{
	struct scsi_cmnd *cmd;
	int result;

	/* now have to find result from card */
	switch (regs.bytes.SUE) {
	case WD719X_SUE_NOERRORS:
		result = DID_OK;
		break;
	case WD719X_SUE_REJECTED:
		dev_err(&wd->pdev->dev, "command rejected\n");
		result = DID_ERROR;
		break;
	case WD719X_SUE_SCBQFULL:
		dev_err(&wd->pdev->dev, "SCB queue is full\n");
		result = DID_ERROR;
		break;
	case WD719X_SUE_TERM:
		dev_dbg(&wd->pdev->dev, "SCB terminated by direct command\n");
		result = DID_ABORT;	/* or DID_RESET? */
		break;
	case WD719X_SUE_CHAN1ABORT:
	case WD719X_SUE_CHAN23ABORT:
		result = DID_ABORT;
		dev_err(&wd->pdev->dev, "DMA abort\n");