618 lines
15 KiB
C
618 lines
15 KiB
C
/*----------------------------------------------------------------*/
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/*
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Qlogic linux driver - work in progress. No Warranty express or implied.
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Use at your own risk. Support Tort Reform so you won't have to read all
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these silly disclaimers.
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Copyright 1994, Tom Zerucha.
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tz@execpc.com
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Additional Code, and much appreciated help by
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Michael A. Griffith
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grif@cs.ucr.edu
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Thanks to Eric Youngdale and Dave Hinds for loadable module and PCMCIA
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help respectively, and for suffering through my foolishness during the
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debugging process.
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Reference Qlogic FAS408 Technical Manual, 53408-510-00A, May 10, 1994
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(you can reference it, but it is incomplete and inaccurate in places)
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Version 0.46 1/30/97 - kernel 1.2.0+
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Functions as standalone, loadable, and PCMCIA driver, the latter from
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Dave Hinds' PCMCIA package.
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Cleaned up 26/10/2002 by Alan Cox <alan@lxorguk.ukuu.org.uk> as part of the 2.5
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SCSI driver cleanup and audit. This driver still needs work on the
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following
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- Non terminating hardware waits
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- Some layering violations with its pcmcia stub
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Redistributable under terms of the GNU General Public License
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For the avoidance of doubt the "preferred form" of this code is one which
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is in an open non patent encumbered format. Where cryptographic key signing
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forms part of the process of creating an executable the information
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including keys needed to generate an equivalently functional executable
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are deemed to be part of the source code.
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*/
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#include <linux/module.h>
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#include <linux/blkdev.h> /* to get disk capacity */
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/proc_fs.h>
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#include <linux/unistd.h>
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#include <linux/spinlock.h>
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#include <linux/stat.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/dma.h>
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#include "scsi.h"
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#include <scsi/scsi_host.h>
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#include "qlogicfas408.h"
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/*----------------------------------------------------------------*/
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static int qlcfg5 = (XTALFREQ << 5); /* 15625/512 */
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static int qlcfg6 = SYNCXFRPD;
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static int qlcfg7 = SYNCOFFST;
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static int qlcfg8 = (SLOWCABLE << 7) | (QL_ENABLE_PARITY << 4);
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static int qlcfg9 = ((XTALFREQ + 4) / 5);
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static int qlcfgc = (FASTCLK << 3) | (FASTSCSI << 4);
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/*----------------------------------------------------------------*/
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/*----------------------------------------------------------------*/
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/* local functions */
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/*----------------------------------------------------------------*/
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/* error recovery - reset everything */
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static void ql_zap(struct qlogicfas408_priv *priv)
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{
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int x;
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int qbase = priv->qbase;
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int int_type = priv->int_type;
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x = inb(qbase + 0xd);
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REG0;
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outb(3, qbase + 3); /* reset SCSI */
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outb(2, qbase + 3); /* reset chip */
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if (x & 0x80)
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REG1;
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}
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/*
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* Do a pseudo-dma tranfer
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*/
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static int ql_pdma(struct qlogicfas408_priv *priv, int phase, char *request, int reqlen)
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{
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int j;
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int qbase = priv->qbase;
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j = 0;
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if (phase & 1) { /* in */
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#if QL_TURBO_PDMA
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rtrc(4)
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/* empty fifo in large chunks */
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if (reqlen >= 128 && (inb(qbase + 8) & 2)) { /* full */
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insl(qbase + 4, request, 32);
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reqlen -= 128;
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request += 128;
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}
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while (reqlen >= 84 && !(j & 0xc0)) /* 2/3 */
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if ((j = inb(qbase + 8)) & 4)
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{
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insl(qbase + 4, request, 21);
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reqlen -= 84;
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request += 84;
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}
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if (reqlen >= 44 && (inb(qbase + 8) & 8)) { /* 1/3 */
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insl(qbase + 4, request, 11);
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reqlen -= 44;
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request += 44;
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}
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#endif
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/* until both empty and int (or until reclen is 0) */
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rtrc(7)
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j = 0;
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while (reqlen && !((j & 0x10) && (j & 0xc0)))
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{
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/* while bytes to receive and not empty */
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j &= 0xc0;
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while (reqlen && !((j = inb(qbase + 8)) & 0x10))
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{
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*request++ = inb(qbase + 4);
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reqlen--;
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}
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if (j & 0x10)
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j = inb(qbase + 8);
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}
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} else { /* out */
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#if QL_TURBO_PDMA
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rtrc(4)
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if (reqlen >= 128 && inb(qbase + 8) & 0x10) { /* empty */
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outsl(qbase + 4, request, 32);
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reqlen -= 128;
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request += 128;
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}
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while (reqlen >= 84 && !(j & 0xc0)) /* 1/3 */
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if (!((j = inb(qbase + 8)) & 8)) {
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outsl(qbase + 4, request, 21);
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reqlen -= 84;
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request += 84;
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}
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if (reqlen >= 40 && !(inb(qbase + 8) & 4)) { /* 2/3 */
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outsl(qbase + 4, request, 10);
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reqlen -= 40;
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request += 40;
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}
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#endif
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/* until full and int (or until reclen is 0) */
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rtrc(7)
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j = 0;
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while (reqlen && !((j & 2) && (j & 0xc0))) {
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/* while bytes to send and not full */
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while (reqlen && !((j = inb(qbase + 8)) & 2))
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{
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outb(*request++, qbase + 4);
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reqlen--;
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}
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if (j & 2)
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j = inb(qbase + 8);
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}
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}
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/* maybe return reqlen */
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return inb(qbase + 8) & 0xc0;
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}
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/*
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* Wait for interrupt flag (polled - not real hardware interrupt)
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*/
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static int ql_wai(struct qlogicfas408_priv *priv)
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{
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int k;
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int qbase = priv->qbase;
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unsigned long i;
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k = 0;
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i = jiffies + WATCHDOG;
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while (time_before(jiffies, i) && !priv->qabort &&
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!((k = inb(qbase + 4)) & 0xe0)) {
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barrier();
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cpu_relax();
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}
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if (time_after_eq(jiffies, i))
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return (DID_TIME_OUT);
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if (priv->qabort)
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return (priv->qabort == 1 ? DID_ABORT : DID_RESET);
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if (k & 0x60)
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ql_zap(priv);
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if (k & 0x20)
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return (DID_PARITY);
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if (k & 0x40)
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return (DID_ERROR);
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return 0;
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}
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/*
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* Initiate scsi command - queueing handler
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* caller must hold host lock
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*/
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static void ql_icmd(struct scsi_cmnd *cmd)
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{
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struct qlogicfas408_priv *priv = get_priv_by_cmd(cmd);
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int qbase = priv->qbase;
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int int_type = priv->int_type;
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unsigned int i;
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priv->qabort = 0;
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REG0;
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/* clearing of interrupts and the fifo is needed */
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inb(qbase + 5); /* clear interrupts */
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if (inb(qbase + 5)) /* if still interrupting */
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outb(2, qbase + 3); /* reset chip */
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else if (inb(qbase + 7) & 0x1f)
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outb(1, qbase + 3); /* clear fifo */
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while (inb(qbase + 5)); /* clear ints */
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REG1;
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outb(1, qbase + 8); /* set for PIO pseudo DMA */
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outb(0, qbase + 0xb); /* disable ints */
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inb(qbase + 8); /* clear int bits */
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REG0;
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outb(0x40, qbase + 0xb); /* enable features */
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/* configurables */
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outb(qlcfgc, qbase + 0xc);
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/* config: no reset interrupt, (initiator) bus id */
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outb(0x40 | qlcfg8 | priv->qinitid, qbase + 8);
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outb(qlcfg7, qbase + 7);
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outb(qlcfg6, qbase + 6);
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outb(qlcfg5, qbase + 5); /* select timer */
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outb(qlcfg9 & 7, qbase + 9); /* prescaler */
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/* outb(0x99, qbase + 5); */
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outb(scmd_id(cmd), qbase + 4);
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for (i = 0; i < cmd->cmd_len; i++)
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outb(cmd->cmnd[i], qbase + 2);
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priv->qlcmd = cmd;
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outb(0x41, qbase + 3); /* select and send command */
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}
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/*
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* Process scsi command - usually after interrupt
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*/
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static unsigned int ql_pcmd(struct scsi_cmnd *cmd)
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{
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unsigned int i, j;
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unsigned long k;
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unsigned int result; /* ultimate return result */
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unsigned int status; /* scsi returned status */
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unsigned int message; /* scsi returned message */
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unsigned int phase; /* recorded scsi phase */
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unsigned int reqlen; /* total length of transfer */
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char *buf;
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struct qlogicfas408_priv *priv = get_priv_by_cmd(cmd);
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int qbase = priv->qbase;
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int int_type = priv->int_type;
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rtrc(1)
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j = inb(qbase + 6);
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i = inb(qbase + 5);
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if (i == 0x20) {
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return (DID_NO_CONNECT << 16);
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}
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i |= inb(qbase + 5); /* the 0x10 bit can be set after the 0x08 */
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if (i != 0x18) {
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printk(KERN_ERR "Ql:Bad Interrupt status:%02x\n", i);
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ql_zap(priv);
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return (DID_BAD_INTR << 16);
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}
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j &= 7; /* j = inb( qbase + 7 ) >> 5; */
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/* correct status is supposed to be step 4 */
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/* it sometimes returns step 3 but with 0 bytes left to send */
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/* We can try stuffing the FIFO with the max each time, but we will get a
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sequence of 3 if any bytes are left (but we do flush the FIFO anyway */
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if (j != 3 && j != 4) {
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printk(KERN_ERR "Ql:Bad sequence for command %d, int %02X, cmdleft = %d\n",
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j, i, inb(qbase + 7) & 0x1f);
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ql_zap(priv);
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return (DID_ERROR << 16);
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}
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result = DID_OK;
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if (inb(qbase + 7) & 0x1f) /* if some bytes in fifo */
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outb(1, qbase + 3); /* clear fifo */
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/* note that request_bufflen is the total xfer size when sg is used */
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reqlen = scsi_bufflen(cmd);
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/* note that it won't work if transfers > 16M are requested */
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if (reqlen && !((phase = inb(qbase + 4)) & 6)) { /* data phase */
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struct scatterlist *sg;
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rtrc(2)
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outb(reqlen, qbase); /* low-mid xfer cnt */
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outb(reqlen >> 8, qbase + 1); /* low-mid xfer cnt */
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outb(reqlen >> 16, qbase + 0xe); /* high xfer cnt */
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outb(0x90, qbase + 3); /* command do xfer */
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/* PIO pseudo DMA to buffer or sglist */
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REG1;
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scsi_for_each_sg(cmd, sg, scsi_sg_count(cmd), i) {
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if (priv->qabort) {
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REG0;
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return ((priv->qabort == 1 ?
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DID_ABORT : DID_RESET) << 16);
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}
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buf = sg_virt(sg);
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if (ql_pdma(priv, phase, buf, sg->length))
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break;
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}
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REG0;
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rtrc(2)
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/*
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* Wait for irq (split into second state of irq handler
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* if this can take time)
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*/
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if ((k = ql_wai(priv)))
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return (k << 16);
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k = inb(qbase + 5); /* should be 0x10, bus service */
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}
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/*
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* Enter Status (and Message In) Phase
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*/
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k = jiffies + WATCHDOG;
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while (time_before(jiffies, k) && !priv->qabort &&
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!(inb(qbase + 4) & 6))
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cpu_relax(); /* wait for status phase */
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if (time_after_eq(jiffies, k)) {
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ql_zap(priv);
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return (DID_TIME_OUT << 16);
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}
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/* FIXME: timeout ?? */
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while (inb(qbase + 5))
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cpu_relax(); /* clear pending ints */
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if (priv->qabort)
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return ((priv->qabort == 1 ? DID_ABORT : DID_RESET) << 16);
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outb(0x11, qbase + 3); /* get status and message */
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if ((k = ql_wai(priv)))
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return (k << 16);
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i = inb(qbase + 5); /* get chip irq stat */
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j = inb(qbase + 7) & 0x1f; /* and bytes rec'd */
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status = inb(qbase + 2);
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message = inb(qbase + 2);
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/*
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* Should get function complete int if Status and message, else
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* bus serv if only status
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*/
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if (!((i == 8 && j == 2) || (i == 0x10 && j == 1))) {
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printk(KERN_ERR "Ql:Error during status phase, int=%02X, %d bytes recd\n", i, j);
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result = DID_ERROR;
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}
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outb(0x12, qbase + 3); /* done, disconnect */
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rtrc(1)
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if ((k = ql_wai(priv)))
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return (k << 16);
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/*
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* Should get bus service interrupt and disconnect interrupt
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*/
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i = inb(qbase + 5); /* should be bus service */
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while (!priv->qabort && ((i & 0x20) != 0x20)) {
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barrier();
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cpu_relax();
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i |= inb(qbase + 5);
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}
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rtrc(0)
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if (priv->qabort)
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return ((priv->qabort == 1 ? DID_ABORT : DID_RESET) << 16);
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return (result << 16) | (message << 8) | (status & STATUS_MASK);
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}
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/*
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* Interrupt handler
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*/
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static void ql_ihandl(void *dev_id)
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{
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struct scsi_cmnd *icmd;
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struct Scsi_Host *host = dev_id;
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struct qlogicfas408_priv *priv = get_priv_by_host(host);
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int qbase = priv->qbase;
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REG0;
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if (!(inb(qbase + 4) & 0x80)) /* false alarm? */
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return;
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if (priv->qlcmd == NULL) { /* no command to process? */
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int i;
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i = 16;
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while (i-- && inb(qbase + 5)); /* maybe also ql_zap() */
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return;
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}
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icmd = priv->qlcmd;
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icmd->result = ql_pcmd(icmd);
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priv->qlcmd = NULL;
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/*
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* If result is CHECK CONDITION done calls qcommand to request
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* sense
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*/
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(icmd->scsi_done) (icmd);
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}
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irqreturn_t qlogicfas408_ihandl(int irq, void *dev_id)
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{
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unsigned long flags;
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struct Scsi_Host *host = dev_id;
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spin_lock_irqsave(host->host_lock, flags);
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ql_ihandl(dev_id);
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spin_unlock_irqrestore(host->host_lock, flags);
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return IRQ_HANDLED;
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}
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/*
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* Queued command
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*/
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static int qlogicfas408_queuecommand_lck(struct scsi_cmnd *cmd,
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void (*done) (struct scsi_cmnd *))
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{
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struct qlogicfas408_priv *priv = get_priv_by_cmd(cmd);
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if (scmd_id(cmd) == priv->qinitid) {
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cmd->result = DID_BAD_TARGET << 16;
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done(cmd);
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return 0;
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}
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cmd->scsi_done = done;
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/* wait for the last command's interrupt to finish */
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while (priv->qlcmd != NULL) {
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barrier();
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cpu_relax();
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}
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ql_icmd(cmd);
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return 0;
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}
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DEF_SCSI_QCMD(qlogicfas408_queuecommand)
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/*
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* Return bios parameters
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*/
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int qlogicfas408_biosparam(struct scsi_device *disk, struct block_device *dev,
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sector_t capacity, int ip[])
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{
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/* This should mimic the DOS Qlogic driver's behavior exactly */
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ip[0] = 0x40;
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ip[1] = 0x20;
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ip[2] = (unsigned long) capacity / (ip[0] * ip[1]);
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if (ip[2] > 1024) {
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ip[0] = 0xff;
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ip[1] = 0x3f;
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ip[2] = (unsigned long) capacity / (ip[0] * ip[1]);
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#if 0
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if (ip[2] > 1023)
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ip[2] = 1023;
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#endif
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}
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return 0;
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}
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/*
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* Abort a command in progress
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*/
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int qlogicfas408_abort(struct scsi_cmnd *cmd)
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{
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struct qlogicfas408_priv *priv = get_priv_by_cmd(cmd);
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priv->qabort = 1;
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ql_zap(priv);
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return SUCCESS;
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}
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/*
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* Reset SCSI bus
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* FIXME: This function is invoked with cmd = NULL directly by
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* the PCMCIA qlogic_stub code. This wants fixing
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*/
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int qlogicfas408_host_reset(struct scsi_cmnd *cmd)
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{
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struct qlogicfas408_priv *priv = get_priv_by_cmd(cmd);
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unsigned long flags;
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priv->qabort = 2;
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spin_lock_irqsave(cmd->device->host->host_lock, flags);
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ql_zap(priv);
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spin_unlock_irqrestore(cmd->device->host->host_lock, flags);
|
|
|
|
return SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* Return info string
|
|
*/
|
|
|
|
const char *qlogicfas408_info(struct Scsi_Host *host)
|
|
{
|
|
struct qlogicfas408_priv *priv = get_priv_by_host(host);
|
|
return priv->qinfo;
|
|
}
|
|
|
|
/*
|
|
* Get type of chip
|
|
*/
|
|
|
|
int qlogicfas408_get_chip_type(int qbase, int int_type)
|
|
{
|
|
REG1;
|
|
return inb(qbase + 0xe) & 0xf8;
|
|
}
|
|
|
|
/*
|
|
* Perform initialization tasks
|
|
*/
|
|
|
|
void qlogicfas408_setup(int qbase, int id, int int_type)
|
|
{
|
|
outb(1, qbase + 8); /* set for PIO pseudo DMA */
|
|
REG0;
|
|
outb(0x40 | qlcfg8 | id, qbase + 8); /* (ini) bus id, disable scsi rst */
|
|
outb(qlcfg5, qbase + 5); /* select timer */
|
|
outb(qlcfg9, qbase + 9); /* prescaler */
|
|
|
|
#if QL_RESET_AT_START
|
|
outb(3, qbase + 3);
|
|
|
|
REG1;
|
|
/* FIXME: timeout */
|
|
while (inb(qbase + 0xf) & 4)
|
|
cpu_relax();
|
|
|
|
REG0;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Checks if this is a QLogic FAS 408
|
|
*/
|
|
|
|
int qlogicfas408_detect(int qbase, int int_type)
|
|
{
|
|
REG1;
|
|
return (((inb(qbase + 0xe) ^ inb(qbase + 0xe)) == 7) &&
|
|
((inb(qbase + 0xe) ^ inb(qbase + 0xe)) == 7));
|
|
}
|
|
|
|
/*
|
|
* Disable interrupts
|
|
*/
|
|
|
|
void qlogicfas408_disable_ints(struct qlogicfas408_priv *priv)
|
|
{
|
|
int qbase = priv->qbase;
|
|
int int_type = priv->int_type;
|
|
|
|
REG1;
|
|
outb(0, qbase + 0xb); /* disable ints */
|
|
}
|
|
|
|
/*
|
|
* Init and exit functions
|
|
*/
|
|
|
|
static int __init qlogicfas408_init(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void __exit qlogicfas408_exit(void)
|
|
{
|
|
|
|
}
|
|
|
|
MODULE_AUTHOR("Tom Zerucha, Michael Griffith");
|
|
MODULE_DESCRIPTION("Driver for the Qlogic FAS SCSI controllers");
|
|
MODULE_LICENSE("GPL");
|
|
module_init(qlogicfas408_init);
|
|
module_exit(qlogicfas408_exit);
|
|
|
|
EXPORT_SYMBOL(qlogicfas408_info);
|
|
EXPORT_SYMBOL(qlogicfas408_queuecommand);
|
|
EXPORT_SYMBOL(qlogicfas408_abort);
|
|
EXPORT_SYMBOL(qlogicfas408_host_reset);
|
|
EXPORT_SYMBOL(qlogicfas408_biosparam);
|
|
EXPORT_SYMBOL(qlogicfas408_ihandl);
|
|
EXPORT_SYMBOL(qlogicfas408_get_chip_type);
|
|
EXPORT_SYMBOL(qlogicfas408_setup);
|
|
EXPORT_SYMBOL(qlogicfas408_detect);
|
|
EXPORT_SYMBOL(qlogicfas408_disable_ints);
|
|
|