Release 4.11 drivers/scsi/eata_pio.c

/************************************************************
 *                                                          *
 *               Linux EATA SCSI PIO driver                 *
 *                                                          *
 *  based on the CAM document CAM/89-004 rev. 2.0c,         *
 *  DPT's driver kit, some internal documents and source,   *
 *  and several other Linux scsi drivers and kernel docs.   *
 *                                                          *
 *  The driver currently:                                   *
 *      -supports all EATA-PIO boards                       *
 *      -only supports DASD devices                         *
 *                                                          *
 *  (c)1993-96 Michael Neuffer, Alfred Arnold               *
 *             neuffer@goofy.zdv.uni-mainz.de               *
 *             a.arnold@kfa-juelich.de                      * 
 *                                                          *
 *  Updated 2002 by Alan Cox <alan@lxorguk.ukuu.org.uk> for *
 *   Linux 2.5.x and the newer locking and error handling   *
 *                                                          *
 *  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 kernel; if not, write to *
 *  the Free Software Foundation, Inc., 675 Mass Ave,       *
 *  Cambridge, MA 02139, USA.                               *
 *                                                          *
 *  For the avoidance of doubt the "preferred form" of this *
 *  code is one which is in an open non patent encumbered   *
 *  format. Where cryptographic key signing forms part of   *
 *  the process of creating an executable the information   *
 *  including keys needed to generate an equivalently       *
 *  functional executable are deemed to be part of the      *
 *  source code are deemed to be part of the source code.   *
 *                                                          *
 ************************************************************
 *  last change: 2002/11/02               OS: Linux 2.5.45  *
 ************************************************************/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/interrupt.h>
#include <linux/blkdev.h>
#include <linux/spinlock.h>
#include <linux/delay.h>

#include <asm/io.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>

#include "eata_generic.h"
#include "eata_pio.h"



static unsigned int ISAbases[MAXISA] =	{
	 0x1F0, 0x170, 0x330, 0x230
};


static unsigned int ISAirqs[MAXISA] = {
	14, 12, 15, 11
};


static unsigned char EISAbases[] = { 
	1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1 
};


static unsigned int registered_HBAs;

static struct Scsi_Host *last_HBA;

static struct Scsi_Host *first_HBA;

static unsigned char reg_IRQ[16];

static unsigned char reg_IRQL[16];

static unsigned long int_counter;

static unsigned long queue_counter;


static struct scsi_host_template driver_template;



static int eata_pio_show_info(struct seq_file *m, struct Scsi_Host *shost)
{
	seq_printf(m, "EATA (Extended Attachment) PIO driver version: "
		   "%d.%d%s\n",VER_MAJOR, VER_MINOR, VER_SUB);
	seq_printf(m, "queued commands:     %10ld\n"
		   "processed interrupts:%10ld\n", queue_counter, int_counter);
	seq_printf(m, "\nscsi%-2d: HBA %.10s\n",
		   shost->host_no, SD(shost)->name);
	seq_printf(m, "Firmware revision: v%s\n",
		   SD(shost)->revision);
	seq_puts(m, "IO: PIO\n");
	seq_printf(m, "Base IO : %#.4x\n", (u32) shost->base);
	seq_printf(m, "Host Bus: %s\n",
		   (SD(shost)->bustype == 'P')?"PCI ":
		   (SD(shost)->bustype == 'E')?"EISA":"ISA ");
	return 0;
}

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1
0.75%
1
25.00%
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133
100.00%
4
100.00%



static int eata_pio_release(struct Scsi_Host *sh)
{
	hostdata *hd = SD(sh);
	if (sh->irq && reg_IRQ[sh->irq] == 1)
		free_irq(sh->irq, NULL);
	else
		reg_IRQ[sh->irq]--;
	if (SD(sh)->channel == 0) {
		if (sh->io_port && sh->n_io_port)
			release_region(sh->io_port, sh->n_io_port);
	}
	/* At this point the PCI reference can go */
	if (hd->pdev)
		pci_dev_put(hd->pdev);
	return 1;
}

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1
0.96%
1
20.00%
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104
100.00%
5
100.00%



static void IncStat(struct scsi_pointer *SCp, unsigned int Increment)
{
	SCp->ptr += Increment;
	if ((SCp->this_residual -= Increment) == 0) {
		if ((--SCp->buffers_residual) == 0)
			SCp->Status = 0;
		else {
			SCp->buffer++;
			SCp->ptr = sg_virt(SCp->buffer);
			SCp->this_residual = SCp->buffer->length;
		}
	}
}

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Linus Torvalds (pre-git)
72
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1
16.67%
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5
6.17%
3
50.00%
Christoph Hellwig
3
3.70%
1
16.67%
Jens Axboe
1
1.23%
1
16.67%
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81
100.00%
6
100.00%

static irqreturn_t eata_pio_int_handler(int irq, void *dev_id);



static irqreturn_t do_eata_pio_int_handler(int irq, void *dev_id)
{
	unsigned long flags;
	struct Scsi_Host *dev = dev_id;
	irqreturn_t ret;

	spin_lock_irqsave(dev->host_lock, flags);
	ret = eata_pio_int_handler(irq, dev_id);
	spin_unlock_irqrestore(dev->host_lock, flags);
	return ret;
}

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Linus Torvalds (pre-git)
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7
12.28%
2
40.00%
Andrew Morton
3
5.26%
1
20.00%
Total
57
100.00%
5
100.00%



static irqreturn_t eata_pio_int_handler(int irq, void *dev_id)
{
	unsigned int eata_stat = 0xfffff;
	struct scsi_cmnd *cmd;
	hostdata *hd;
	struct eata_ccb *cp;
	unsigned long base;
	unsigned int x, z;
	struct Scsi_Host *sh;
	unsigned short zwickel = 0;
	unsigned char stat, odd;
	irqreturn_t ret = IRQ_NONE;

	for (x = 1, sh = first_HBA; x <= registered_HBAs; x++, sh = SD(sh)->prev) 
	{
		if (sh->irq != irq)
			continue;
		if (inb(sh->base + HA_RSTATUS) & HA_SBUSY)
			continue;

		int_counter++;
		ret = IRQ_HANDLED;

		hd = SD(sh);

		cp = &hd->ccb[0];
		cmd = cp->cmd;
		base = cmd->device->host->base;

		do {
			stat = inb(base + HA_RSTATUS);
			if (stat & HA_SDRQ) {
				if (cp->DataIn) {
					z = 256;
					odd = 0;
					while ((cmd->SCp.Status) && ((z > 0) || (odd))) {
						if (odd) {
							*(cmd->SCp.ptr) = zwickel >> 8;
							IncStat(&cmd->SCp, 1);
							odd = 0;
						}
						x = min_t(unsigned int, z, cmd->SCp.this_residual / 2);
						insw(base + HA_RDATA, cmd->SCp.ptr, x);
						z -= x;
						IncStat(&cmd->SCp, 2 * x);
						if ((z > 0) && (cmd->SCp.this_residual == 1)) {
							zwickel = inw(base + HA_RDATA);
							*(cmd->SCp.ptr) = zwickel & 0xff;
							IncStat(&cmd->SCp, 1);
							z--;
							odd = 1;
						}
					}
					while (z > 0) {
						zwickel = inw(base + HA_RDATA);
						z--;
					}
				} else {	/* cp->DataOut */

					odd = 0;
					z = 256;
					while ((cmd->SCp.Status) && ((z > 0) || (odd))) {
						if (odd) {
							zwickel += *(cmd->SCp.ptr) << 8;
							IncStat(&cmd->SCp, 1);
							outw(zwickel, base + HA_RDATA);
							z--;
							odd = 0;
						}
						x = min_t(unsigned int, z, cmd->SCp.this_residual / 2);
						outsw(base + HA_RDATA, cmd->SCp.ptr, x);
						z -= x;
						IncStat(&cmd->SCp, 2 * x);
						if ((z > 0) && (cmd->SCp.this_residual == 1)) {
							zwickel = *(cmd->SCp.ptr);
							zwickel &= 0xff;
							IncStat(&cmd->SCp, 1);
							odd = 1;
						}
					}
					while (z > 0 || odd) {
						outw(zwickel, base + HA_RDATA);
						z--;
						odd = 0;
					}
				}
			}
		}
		while ((stat & HA_SDRQ) || ((stat & HA_SMORE) && hd->moresupport));

		/* terminate handler if HBA goes busy again, i.e. transfers
                 * more data */

		if (stat & HA_SBUSY)
			break;

		/* OK, this is quite stupid, but I haven't found any correct
                 * way to get HBA&SCSI status so far */

		if (!(inb(base + HA_RSTATUS) & HA_SERROR)) {
			cmd->result = (DID_OK << 16);
			hd->devflags |= (1 << cp->cp_id);
		} else if (hd->devflags & (1 << cp->cp_id))
			cmd->result = (DID_OK << 16) + 0x02;
		else
			cmd->result = (DID_NO_CONNECT << 16);

		if (cp->status == LOCKED) {
			cp->status = FREE;
			eata_stat = inb(base + HA_RSTATUS);
			printk(KERN_CRIT "eata_pio: int_handler, freeing locked " "queueslot\n");
			return ret;
		}
#if DBG_INTR2
		if (stat != 0x50)
			printk(KERN_DEBUG "stat: %#.2x, result: %#.8x\n", stat, cmd->result);
#endif

		cp->status = FREE;	/* now we can release the slot  */

		cmd->scsi_done(cmd);
	}

	return ret;
}

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27.27%
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9
1.20%
1
9.09%
Linus Torvalds
8
1.07%
2
18.18%
Luben Tuikov
2
0.27%
1
9.09%
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751
100.00%
11
100.00%



static inline unsigned int eata_pio_send_command(unsigned long base, unsigned char command)
{
	unsigned int loop = 50;

	while (inb(base + HA_RSTATUS) & HA_SBUSY)
		if (--loop == 0)
			return 1;

	/* Enable interrupts for HBA.  It is not the best way to do it at this
         * place, but I hope that it doesn't interfere with the IDE driver 
         * initialization this way */

	outb(HA_CTRL_8HEADS, base + HA_CTRLREG);

	outb(command, base + HA_WCOMMAND);
	return 0;
}

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2
3.08%
1
20.00%
Total
65
100.00%
5
100.00%



static int eata_pio_queue_lck(struct scsi_cmnd *cmd,
		void (*done)(struct scsi_cmnd *))
{
	unsigned int x, y;
	unsigned long base;

	hostdata *hd;
	struct Scsi_Host *sh;
	struct eata_ccb *cp;

	queue_counter++;

	hd = HD(cmd);
	sh = cmd->device->host;
	base = sh->base;

	/* use only slot 0, as 2001 can handle only one cmd at a time */

	y = x = 0;

	if (hd->ccb[y].status != FREE) {

		DBG(DBG_QUEUE, printk(KERN_EMERG "can_queue %d, x %d, y %d\n", sh->can_queue, x, y));
#if DEBUG_EATA
		panic(KERN_EMERG "eata_pio: run out of queue slots cmdno:%ld " "intrno: %ld\n", queue_counter, int_counter);
#else
		panic(KERN_EMERG "eata_pio: run out of queue slots....\n");
#endif
	}

	cp = &hd->ccb[y];

	memset(cp, 0, sizeof(struct eata_ccb));

	cp->status = USED;	/* claim free slot */

	DBG(DBG_QUEUE, scmd_printk(KERN_DEBUG, cmd,
		"eata_pio_queue 0x%p, y %d\n", cmd, y));

	cmd->scsi_done = (void *) done;

	if (cmd->sc_data_direction == DMA_TO_DEVICE)
		cp->DataOut = 1;	/* Output mode */
	else
		cp->DataIn = 0;	/* Input mode  */

	cp->Interpret = (cmd->device->id == hd->hostid);
	cp->cp_datalen = cpu_to_be32(scsi_bufflen(cmd));
	cp->Auto_Req_Sen = 0;
	cp->cp_reqDMA = 0;
	cp->reqlen = 0;

	cp->cp_id = cmd->device->id;
	cp->cp_lun = cmd->device->lun;
	cp->cp_dispri = 0;
	cp->cp_identify = 1;
	memcpy(cp->cp_cdb, cmd->cmnd, COMMAND_SIZE(*cmd->cmnd));

	cp->cp_statDMA = 0;

	cp->cp_viraddr = cp;
	cp->cmd = cmd;
	cmd->host_scribble = (char *) &hd->ccb[y];

	if (!scsi_bufflen(cmd)) {
		cmd->SCp.buffers_residual = 1;
		cmd->SCp.ptr = NULL;
		cmd->SCp.this_residual = 0;
		cmd->SCp.buffer = NULL;
	} else {
		cmd->SCp.buffer = scsi_sglist(cmd);
		cmd->SCp.buffers_residual = scsi_sg_count(cmd);
		cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
		cmd->SCp.this_residual = cmd->SCp.buffer->length;
	}
	cmd->SCp.Status = (cmd->SCp.this_residual != 0);	/* TRUE as long as bytes 
                                                                 * are to transfer */

	if (eata_pio_send_command(base, EATA_CMD_PIO_SEND_CP)) {
		cmd->result = DID_BUS_BUSY << 16;
		scmd_printk(KERN_NOTICE, cmd,
			"eata_pio_queue pid 0x%p, HBA busy, "
			"returning DID_BUS_BUSY, done.\n", cmd);
		done(cmd);
		cp->status = FREE;
		return 0;
	}
	/* FIXME: timeout */
	while (!(inb(base + HA_RSTATUS) & HA_SDRQ))
		cpu_relax();
	outsw(base + HA_RDATA, cp, hd->cplen);
	outb(EATA_CMD_PIO_TRUNC, base + HA_WCOMMAND);
	for (x = 0; x < hd->cppadlen; x++)
		outw(0, base + HA_RDATA);

	DBG(DBG_QUEUE, scmd_printk(KERN_DEBUG, cmd,
		"Queued base %#.4lx cmd: 0x%p "
		"slot %d irq %d\n", sh->base, cmd, y, sh->irq));

	return 0;
}

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15
2.50%
1
7.14%
Christoph Hellwig
13
2.17%
2
14.29%
Luben Tuikov
10
1.67%
2
14.29%
Jeff Garzik
10
1.67%
2
14.29%
Jens Axboe
1
0.17%
1
7.14%
Total
599
100.00%
14
100.00%

static DEF_SCSI_QCMD(eata_pio_queue)


static int eata_pio_abort(struct scsi_cmnd *cmd)
{
	unsigned int loop = 100;

	DBG(DBG_ABNORM, scmd_printk(KERN_WARNING, cmd,
		"eata_pio_abort called pid: 0x%p\n", cmd));

	while (inb(cmd->device->host->base + HA_RAUXSTAT) & HA_ABUSY)
		if (--loop == 0) {
			printk(KERN_WARNING "eata_pio: abort, timeout error.\n");
			return FAILED;
		}
	if (CD(cmd)->status == FREE) {
		DBG(DBG_ABNORM, printk(KERN_WARNING "Returning: SCSI_ABORT_NOT_RUNNING\n"));
		return FAILED;
	}
	if (CD(cmd)->status == USED) {
		DBG(DBG_ABNORM, printk(KERN_WARNING "Returning: SCSI_ABORT_BUSY\n"));
		/* We want to sleep a bit more here */
		return FAILED;		/* SNOOZE */
	}
	if (CD(cmd)->status == RESET) {
		printk(KERN_WARNING "eata_pio: abort, command reset error.\n");
		return FAILED;
	}
	if (CD(cmd)->status == LOCKED) {
		DBG(DBG_ABNORM, printk(KERN_WARNING "eata_pio: abort, queue slot " "locked.\n"));
		return FAILED;
	}
	panic("eata_pio: abort: invalid slot status\n");

}

static 
int eata_pio_host_reset(struct scsi_cmnd *cmd)
{
	unsigned int x, limit = 0;
	unsigned char success = 0;
	struct scsi_cmnd *sp;
	struct Scsi_Host *host = cmd->device->host;

	DBG(DBG_ABNORM, scmd_printk(KERN_WARNING, cmd,
		"eata_pio_reset called\n"));

	spin_lock_irq(host->host_lock);

	if (HD(cmd)->state == RESET) {
		printk(KERN_WARNING "eata_pio_reset: exit, already in reset.\n");
		spin_unlock_irq(host->host_lock);
		return FAILED;
	}

	/* force all slots to be free */

	for (x = 0; x < cmd->device->host->can_queue; x++) {

		if (HD(cmd)->ccb[x].status == FREE)
			continue;

		sp = HD(cmd)->ccb[x].cmd;
		HD(cmd)->ccb[x].status = RESET;
		printk(KERN_WARNING "eata_pio_reset: slot %d in reset.\n", x);

		if (sp == NULL)
			panic("eata_pio_reset: slot %d, sp==NULL.\n", x);
	}

	/* hard reset the HBA  */
	outb(EATA_CMD_RESET, cmd->device->host->base + HA_WCOMMAND);

	DBG(DBG_ABNORM, printk(KERN_WARNING "eata_pio_reset: board reset done.\n"));
	HD(cmd)->state = RESET;

	spin_unlock_irq(host->host_lock);
	msleep(3000);
	spin_lock_irq(host->host_lock);

	DBG(DBG_ABNORM, printk(KERN_WARNING "eata_pio_reset: interrupts disabled, " "loops %d.\n", limit));

	for (x = 0; x < cmd->device->host->can_queue; x++) {

		/* Skip slots already set free by interrupt */
		if (HD(cmd)->ccb[x].status != RESET)
			continue;

		sp = HD(cmd)->ccb[x].cmd;
		sp->result = DID_RESET << 16;

		/* This mailbox is terminated */
		printk(KERN_WARNING "eata_pio_reset: reset ccb %d.\n", x);
		HD(cmd)->ccb[x].status = FREE;

		sp->scsi_done(sp);
	}

	HD(cmd)->state = 0;

	spin_unlock_irq(host->host_lock);

	if (success) {		/* hmmm... */
		DBG(DBG_ABNORM, printk(KERN_WARNING "eata_pio_reset: exit, success.\n"));
		return SUCCESS;
	} else {
		DBG(DBG_ABNORM, printk(KERN_WARNING "eata_pio_reset: exit, wakeup.\n"));
		return FAILED;
	}
}

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Linus Torvalds (pre-git)
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33
8.40%
3
20.00%
Jeff Garzik
23
5.85%
3
20.00%
Christoph Hellwig
8
2.04%
2
13.33%
Luben Tuikov
8
2.04%
1
6.67%
Nishanth Aravamudan
2
0.51%
1
6.67%
Total
393
100.00%
15
100.00%



static char *get_pio_board_data(unsigned long base, unsigned int irq, unsigned int id, unsigned long cplen, unsigned short cppadlen)
{
	struct eata_ccb cp;
	static char buff[256];
	int z;

	memset(&cp, 0, sizeof(struct eata_ccb));
	memset(buff, 0, sizeof(buff));

	cp.DataIn = 1;
	cp.Interpret = 1;	/* Interpret command */

	cp.cp_datalen = cpu_to_be32(254);
	cp.cp_dataDMA = cpu_to_be32(0);

	cp.cp_id = id;
	cp.cp_lun = 0;

	cp.cp_cdb[0] = INQUIRY;
	cp.cp_cdb[1] = 0;
	cp.cp_cdb[2] = 0;
	cp.cp_cdb[3] = 0;
	cp.cp_cdb[4] = 254;
	cp.cp_cdb[5] = 0;

	if (eata_pio_send_command(base, EATA_CMD_PIO_SEND_CP))
		return NULL;

	while (!(inb(base + HA_RSTATUS) & HA_SDRQ))
		cpu_relax();

	outsw(base + HA_RDATA, &cp, cplen);
	outb(EATA_CMD_PIO_TRUNC, base + HA_WCOMMAND);
	for (z = 0; z < cppadlen; z++)
		outw(0, base + HA_RDATA);

	while (inb(base + HA_RSTATUS) & HA_SBUSY)
		cpu_relax();

	if (inb(base + HA_RSTATUS) & HA_SERROR)
		return NULL;
	else if (!(inb(base + HA_RSTATUS) & HA_SDRQ))
		return NULL;
	else {
		insw(base + HA_RDATA, &buff, 127);
		while (inb(base + HA_RSTATUS) & HA_SDRQ)
			inw(base + HA_RDATA);
		return buff;
	}
}

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60.00%
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2
0.63%
1
20.00%
Total
318
100.00%
5
100.00%



static int get_pio_conf_PIO(unsigned long base, struct get_conf *buf)
{
	unsigned long loop = HZ / 2;
	int z;
	unsigned short *p;

	if (!request_region(base, 9, "eata_pio"))
		return 0;

	memset(buf, 0, sizeof(struct get_conf));

	while (inb(base + HA_RSTATUS) & HA_SBUSY)
		if (--loop == 0)
			goto fail;

	DBG(DBG_PIO && DBG_PROBE, printk(KERN_DEBUG "Issuing PIO READ CONFIG to HBA at %#lx\n", base));
	eata_pio_send_command(base, EATA_CMD_PIO_READ_CONFIG);

	loop = 50;
	for (p = (unsigned short *) buf; (long) p <= ((long) buf + (sizeof(struct get_conf) / 2)); p++) {
		while (!(inb(base + HA_RSTATUS) & HA_SDRQ))
			if (--loop == 0)
				goto fail;

		loop = 50;
		*p = inw(base + HA_RDATA);
	}
	if (inb(base + HA_RSTATUS) & HA_SERROR) {
		DBG(DBG_PROBE, printk("eata_dma: get_conf_PIO, error during "
					"transfer for HBA at %lx\n", base));
		goto fail;
	}

	if (cpu_to_be32(EATA_SIGNATURE) != buf->signature)
		goto fail;

	DBG(DBG_PIO && DBG_PROBE, printk(KERN_NOTICE "EATA Controller found "
				"at %#4lx EATA Level: %x\n",
				base, (unsigned int) (buf->version)));

	while (inb(base + HA_RSTATUS) & HA_SDRQ)
		inw(base + HA_RDATA);

	if (!ALLOW_DMA_BOARDS) {
		for (z = 0; z < MAXISA; z++)
			if (base == ISAbases[z]) {
				buf->IRQ = ISAirqs[z];
				break;
			}
	}

	return 1;

 fail:
	release_region(base, 9);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
268
82.46%
3
37.50%
Christoph Hellwig
38
11.69%
2
25.00%
Alan Cox
17
5.23%
2
25.00%
Randy Dunlap
2
0.62%
1
12.50%
Total
325
100.00%
8
100.00%



static void print_pio_config(struct get_conf *gc)
{
	printk("Please check values: (read config data)\n");
	printk("LEN: %d ver:%d OCS:%d TAR:%d TRNXFR:%d MORES:%d\n", be32_to_cpu(gc->