Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 637 insertions, 0 deletions

diff --git a/drivers/scsi/qlogicfas408.c b/drivers/scsi/qlogicfas408.c
new file mode 100644
index 00000000000..5b6ce0a88f0
--- /dev/null
+++ b/drivers/scsi/qlogicfas408.c
@@ -0,0 +1,637 @@
+/*----------------------------------------------------------------*/
+/*
+   Qlogic linux driver - work in progress. No Warranty express or implied.
+   Use at your own risk.  Support Tort Reform so you won't have to read all
+   these silly disclaimers.
+
+   Copyright 1994, Tom Zerucha.   
+   tz@execpc.com
+   
+   Additional Code, and much appreciated help by
+   Michael A. Griffith
+   grif@cs.ucr.edu
+
+   Thanks to Eric Youngdale and Dave Hinds for loadable module and PCMCIA
+   help respectively, and for suffering through my foolishness during the
+   debugging process.
+
+   Reference Qlogic FAS408 Technical Manual, 53408-510-00A, May 10, 1994
+   (you can reference it, but it is incomplete and inaccurate in places)
+
+   Version 0.46 1/30/97 - kernel 1.2.0+
+
+   Functions as standalone, loadable, and PCMCIA driver, the latter from
+   Dave Hinds' PCMCIA package.
+   
+   Cleaned up 26/10/2002 by Alan Cox <alan@redhat.com> as part of the 2.5
+   SCSI driver cleanup and audit. This driver still needs work on the
+   following
+   	-	Non terminating hardware waits
+   	-	Some layering violations with its pcmcia stub
+
+   Redistributable under terms of the GNU General Public License
+
+   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.
+
+*/
+
+#include <linux/module.h>
+#include <linux/blkdev.h>		/* to get disk capacity */
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/proc_fs.h>
+#include <linux/unistd.h>
+#include <linux/spinlock.h>
+#include <linux/stat.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/dma.h>
+
+#include "scsi.h"
+#include <scsi/scsi_host.h>
+#include "qlogicfas408.h"
+
+/*----------------------------------------------------------------*/
+static int qlcfg5 = (XTALFREQ << 5);	/* 15625/512 */
+static int qlcfg6 = SYNCXFRPD;
+static int qlcfg7 = SYNCOFFST;
+static int qlcfg8 = (SLOWCABLE << 7) | (QL_ENABLE_PARITY << 4);
+static int qlcfg9 = ((XTALFREQ + 4) / 5);
+static int qlcfgc = (FASTCLK << 3) | (FASTSCSI << 4);
+
+/*----------------------------------------------------------------*/
+
+/*----------------------------------------------------------------*/
+/* local functions */
+/*----------------------------------------------------------------*/
+
+/* error recovery - reset everything */
+
+static void ql_zap(struct qlogicfas408_priv *priv)
+{
+	int x;
+	int qbase = priv->qbase;
+	int int_type = priv->int_type;
+
+	x = inb(qbase + 0xd);
+	REG0;
+	outb(3, qbase + 3);	/* reset SCSI */
+	outb(2, qbase + 3);	/* reset chip */
+	if (x & 0x80)
+		REG1;
+}
+
+/*
+ *	Do a pseudo-dma tranfer
+ */
+ 
+static int ql_pdma(struct qlogicfas408_priv *priv, int phase, char *request, int reqlen)
+{
+	int j;
+	int qbase = priv->qbase;
+	j = 0;
+	if (phase & 1) {	/* in */
+#if QL_TURBO_PDMA
+		rtrc(4)
+		/* empty fifo in large chunks */
+		if (reqlen >= 128 && (inb(qbase + 8) & 2)) {	/* full */
+			insl(qbase + 4, request, 32);
+			reqlen -= 128;
+			request += 128;
+		}
+		while (reqlen >= 84 && !(j & 0xc0))	/* 2/3 */
+			if ((j = inb(qbase + 8)) & 4) 
+			{
+				insl(qbase + 4, request, 21);
+				reqlen -= 84;
+				request += 84;
+			}
+		if (reqlen >= 44 && (inb(qbase + 8) & 8)) {	/* 1/3 */
+			insl(qbase + 4, request, 11);
+			reqlen -= 44;
+			request += 44;
+		}
+#endif
+		/* until both empty and int (or until reclen is 0) */
+		rtrc(7)
+		j = 0;
+		while (reqlen && !((j & 0x10) && (j & 0xc0))) 
+		{
+			/* while bytes to receive and not empty */
+			j &= 0xc0;
+			while (reqlen && !((j = inb(qbase + 8)) & 0x10)) 
+			{
+				*request++ = inb(qbase + 4);
+				reqlen--;
+			}
+			if (j & 0x10)
+				j = inb(qbase + 8);
+
+		}
+	} else {		/* out */
+#if QL_TURBO_PDMA
+		rtrc(4)
+		    if (reqlen >= 128 && inb(qbase + 8) & 0x10) {	/* empty */
+			outsl(qbase + 4, request, 32);
+			reqlen -= 128;
+			request += 128;
+		}
+		while (reqlen >= 84 && !(j & 0xc0))	/* 1/3 */
+			if (!((j = inb(qbase + 8)) & 8)) {
+				outsl(qbase + 4, request, 21);
+				reqlen -= 84;
+				request += 84;
+			}
+		if (reqlen >= 40 && !(inb(qbase + 8) & 4)) {	/* 2/3 */
+			outsl(qbase + 4, request, 10);
+			reqlen -= 40;
+			request += 40;
+		}
+#endif
+		/* until full and int (or until reclen is 0) */
+		rtrc(7)
+		    j = 0;
+		while (reqlen && !((j & 2) && (j & 0xc0))) {
+			/* while bytes to send and not full */
+			while (reqlen && !((j = inb(qbase + 8)) & 2)) 
+			{
+				outb(*request++, qbase + 4);
+				reqlen--;
+			}
+			if (j & 2)
+				j = inb(qbase + 8);
+		}
+	}
+	/* maybe return reqlen */
+	return inb(qbase + 8) & 0xc0;
+}
+
+/*
+ *	Wait for interrupt flag (polled - not real hardware interrupt) 
+ */
+
+static int ql_wai(struct qlogicfas408_priv *priv)
+{
+	int k;
+	int qbase = priv->qbase;
+	unsigned long i;
+
+	k = 0;
+	i = jiffies + WATCHDOG;
+	while (time_before(jiffies, i) && !priv->qabort &&
+					!((k = inb(qbase + 4)) & 0xe0)) {
+		barrier();
+		cpu_relax();
+	}
+	if (time_after_eq(jiffies, i))
+		return (DID_TIME_OUT);
+	if (priv->qabort)
+		return (priv->qabort == 1 ? DID_ABORT : DID_RESET);
+	if (k & 0x60)
+		ql_zap(priv);
+	if (k & 0x20)
+		return (DID_PARITY);
+	if (k & 0x40)
+		return (DID_ERROR);
+	return 0;
+}
+
+/*
+ *	Initiate scsi command - queueing handler 
+ *	caller must hold host lock
+ */
+
+static void ql_icmd(Scsi_Cmnd * cmd)
+{
+	struct qlogicfas408_priv *priv = get_priv_by_cmd(cmd);
+	int 	qbase = priv->qbase;
+	int	int_type = priv->int_type;
+	unsigned int i;
+
+	priv->qabort = 0;
+
+	REG0;
+	/* clearing of interrupts and the fifo is needed */
+
+	inb(qbase + 5);		/* clear interrupts */
+	if (inb(qbase + 5))	/* if still interrupting */
+		outb(2, qbase + 3);	/* reset chip */
+	else if (inb(qbase + 7) & 0x1f)
+		outb(1, qbase + 3);	/* clear fifo */
+	while (inb(qbase + 5));	/* clear ints */
+	REG1;
+	outb(1, qbase + 8);	/* set for PIO pseudo DMA */
+	outb(0, qbase + 0xb);	/* disable ints */
+	inb(qbase + 8);		/* clear int bits */
+	REG0;
+	outb(0x40, qbase + 0xb);	/* enable features */
+
+	/* configurables */
+	outb(qlcfgc, qbase + 0xc);
+	/* config: no reset interrupt, (initiator) bus id */
+	outb(0x40 | qlcfg8 | priv->qinitid, qbase + 8);
+	outb(qlcfg7, qbase + 7);
+	outb(qlcfg6, qbase + 6);
+	 /**/ outb(qlcfg5, qbase + 5);	/* select timer */
+	outb(qlcfg9 & 7, qbase + 9);	/* prescaler */
+/*	outb(0x99, qbase + 5);	*/
+	outb(cmd->device->id, qbase + 4);
+
+	for (i = 0; i < cmd->cmd_len; i++)
+		outb(cmd->cmnd[i], qbase + 2);
+
+	priv->qlcmd = cmd;
+	outb(0x41, qbase + 3);	/* select and send command */
+}
+
+/*
+ *	Process scsi command - usually after interrupt 
+ */
+
+static unsigned int ql_pcmd(Scsi_Cmnd * cmd)
+{
+	unsigned int i, j;
+	unsigned long k;
+	unsigned int result;	/* ultimate return result */
+	unsigned int status;	/* scsi returned status */
+	unsigned int message;	/* scsi returned message */
+	unsigned int phase;	/* recorded scsi phase */
+	unsigned int reqlen;	/* total length of transfer */
+	struct scatterlist *sglist;	/* scatter-gather list pointer */
+	unsigned int sgcount;	/* sg counter */
+	char *buf;
+	struct qlogicfas408_priv *priv = get_priv_by_cmd(cmd);
+	int qbase = priv->qbase;
+	int int_type = priv->int_type;
+
+	rtrc(1)
+	j = inb(qbase + 6);
+	i = inb(qbase + 5);
+	if (i == 0x20) {
+		return (DID_NO_CONNECT << 16);
+	}
+	i |= inb(qbase + 5);	/* the 0x10 bit can be set after the 0x08 */
+	if (i != 0x18) {
+		printk(KERN_ERR "Ql:Bad Interrupt status:%02x\n", i);
+		ql_zap(priv);
+		return (DID_BAD_INTR << 16);
+	}
+	j &= 7;			/* j = inb( qbase + 7 ) >> 5; */
+
+	/* correct status is supposed to be step 4 */
+	/* it sometimes returns step 3 but with 0 bytes left to send */
+	/* We can try stuffing the FIFO with the max each time, but we will get a
+	   sequence of 3 if any bytes are left (but we do flush the FIFO anyway */
+
+	if (j != 3 && j != 4) {
+		printk(KERN_ERR "Ql:Bad sequence for command %d, int %02X, cmdleft = %d\n",
+		     j, i, inb(qbase + 7) & 0x1f);
+		ql_zap(priv);
+		return (DID_ERROR << 16);
+	}
+	result = DID_OK;
+	if (inb(qbase + 7) & 0x1f)	/* if some bytes in fifo */
+		outb(1, qbase + 3);	/* clear fifo */
+	/* note that request_bufflen is the total xfer size when sg is used */
+	reqlen = cmd->request_bufflen;
+	/* note that it won't work if transfers > 16M are requested */
+	if (reqlen && !((phase = inb(qbase + 4)) & 6)) {	/* data phase */
+		rtrc(2)
+		outb(reqlen, qbase);	/* low-mid xfer cnt */
+		outb(reqlen >> 8, qbase + 1);	/* low-mid xfer cnt */
+		outb(reqlen >> 16, qbase + 0xe);	/* high xfer cnt */
+		outb(0x90, qbase + 3);	/* command do xfer */
+		/* PIO pseudo DMA to buffer or sglist */
+		REG1;
+		if (!cmd->use_sg)
+			ql_pdma(priv, phase, cmd->request_buffer,
+				cmd->request_bufflen);
+		else {
+			sgcount = cmd->use_sg;
+			sglist = cmd->request_buffer;
+			while (sgcount--) {
+				if (priv->qabort) {
+					REG0;
+					return ((priv->qabort == 1 ?
+						DID_ABORT : DID_RESET) << 16);
+				}
+				buf = page_address(sglist->page) + sglist->offset;
+				if (ql_pdma(priv, phase, buf, sglist->length))
+					break;
+				sglist++;
+			}
+		}
+		REG0;
+		rtrc(2)
+		/*
+		 *	Wait for irq (split into second state of irq handler
+		 *	if this can take time) 
+		 */
+		if ((k = ql_wai(priv)))
+			return (k << 16);
+		k = inb(qbase + 5);	/* should be 0x10, bus service */
+	}
+
+	/*
+	 *	Enter Status (and Message In) Phase 
+	 */
+	 
+	k = jiffies + WATCHDOG;
+
+	while (time_before(jiffies, k) && !priv->qabort &&
+						!(inb(qbase + 4) & 6))
+		cpu_relax();	/* wait for status phase */
+
+	if (time_after_eq(jiffies, k)) {
+		ql_zap(priv);
+		return (DID_TIME_OUT << 16);
+	}
+
+	/* FIXME: timeout ?? */
+	while (inb(qbase + 5))
+		cpu_relax();	/* clear pending ints */
+
+	if (priv->qabort)
+		return ((priv->qabort == 1 ? DID_ABORT : DID_RESET) << 16);
+
+	outb(0x11, qbase + 3);	/* get status and message */
+	if ((k = ql_wai(priv)))
+		return (k << 16);
+	i = inb(qbase + 5);	/* get chip irq stat */
+	j = inb(qbase + 7) & 0x1f;	/* and bytes rec'd */
+	status = inb(qbase + 2);
+	message = inb(qbase + 2);
+
+	/*
+	 *	Should get function complete int if Status and message, else 
+	 *	bus serv if only status 
+	 */
+	if (!((i == 8 && j == 2) || (i == 0x10 && j == 1))) {
+		printk(KERN_ERR "Ql:Error during status phase, int=%02X, %d bytes recd\n", i, j);
+		result = DID_ERROR;
+	}
+	outb(0x12, qbase + 3);	/* done, disconnect */
+	rtrc(1)
+	if ((k = ql_wai(priv)))
+		return (k << 16);
+
+	/*
+	 *	Should get bus service interrupt and disconnect interrupt 
+	 */
+	 
+	i = inb(qbase + 5);	/* should be bus service */
+	while (!priv->qabort && ((i & 0x20) != 0x20)) {
+		barrier();
+		cpu_relax();
+		i |= inb(qbase + 5);
+	}
+	rtrc(0)
+
+	if (priv->qabort)
+		return ((priv->qabort == 1 ? DID_ABORT : DID_RESET) << 16);
+		
+	return (result << 16) | (message << 8) | (status & STATUS_MASK);
+}
+
+/*
+ *	Interrupt handler 
+ */
+
+static void ql_ihandl(int irq, void *dev_id, struct pt_regs *regs)
+{
+	Scsi_Cmnd *icmd;
+	struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
+	struct qlogicfas408_priv *priv = get_priv_by_host(host);
+	int qbase = priv->qbase;
+	REG0;
+
+	if (!(inb(qbase + 4) & 0x80))	/* false alarm? */
+		return;
+
+	if (priv->qlcmd == NULL) {	/* no command to process? */
+		int i;
+		i = 16;
+		while (i-- && inb(qbase + 5));	/* maybe also ql_zap() */
+		return;
+	}
+	icmd = priv->qlcmd;
+	icmd->result = ql_pcmd(icmd);
+	priv->qlcmd = NULL;
+	/*
+	 *	If result is CHECK CONDITION done calls qcommand to request 
+	 *	sense 
+	 */
+	(icmd->scsi_done) (icmd);
+}
+
+irqreturn_t qlogicfas408_ihandl(int irq, void *dev_id, struct pt_regs *regs)
+{
+	unsigned long flags;
+	struct Scsi_Host *host = dev_id;
+
+	spin_lock_irqsave(host->host_lock, flags);
+	ql_ihandl(irq, dev_id, regs);
+	spin_unlock_irqrestore(host->host_lock, flags);
+	return IRQ_HANDLED;
+}
+
+/*
+ *	Queued command
+ */
+
+int qlogicfas408_queuecommand(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
+{
+	struct qlogicfas408_priv *priv = get_priv_by_cmd(cmd);
+	if (cmd->device->id == priv->qinitid) {
+		cmd->result = DID_BAD_TARGET << 16;
+		done(cmd);
+		return 0;
+	}
+
+	cmd->scsi_done = done;
+	/* wait for the last command's interrupt to finish */
+	while (priv->qlcmd != NULL) {
+		barrier();
+		cpu_relax();
+	}
+	ql_icmd(cmd);
+	return 0;
+}
+
+/* 
+ *	Return bios parameters 
+ */
+
+int qlogicfas408_biosparam(struct scsi_device * disk,
+		        struct block_device *dev,
+			sector_t capacity, int ip[])
+{
+/* This should mimic the DOS Qlogic driver's behavior exactly */
+	ip[0] = 0x40;
+	ip[1] = 0x20;
+	ip[2] = (unsigned long) capacity / (ip[0] * ip[1]);
+	if (ip[2] > 1024) {
+		ip[0] = 0xff;
+		ip[1] = 0x3f;
+		ip[2] = (unsigned long) capacity / (ip[0] * ip[1]);
+#if 0
+		if (ip[2] > 1023)
+			ip[2] = 1023;
+#endif
+	}
+	return 0;
+}
+
+/*
+ *	Abort a command in progress
+ */
+ 
+int qlogicfas408_abort(Scsi_Cmnd * cmd)
+{
+	struct qlogicfas408_priv *priv = get_priv_by_cmd(cmd);
+	priv->qabort = 1;
+	ql_zap(priv);
+	return SUCCESS;
+}
+
+/* 
+ *	Reset SCSI bus
+ *	FIXME: This function is invoked with cmd = NULL directly by
+ *	the PCMCIA qlogic_stub code. This wants fixing
+ */
+
+int qlogicfas408_bus_reset(Scsi_Cmnd * cmd)
+{
+	struct qlogicfas408_priv *priv = get_priv_by_cmd(cmd);
+	priv->qabort = 2;
+	ql_zap(priv);
+	return SUCCESS;
+}
+
+/* 
+ *	Reset SCSI host controller
+ */
+
+int qlogicfas408_host_reset(Scsi_Cmnd * cmd)
+{
+	return FAILED;
+}
+
+/* 
+ *	Reset SCSI device
+ */
+
+int qlogicfas408_device_reset(Scsi_Cmnd * cmd)
+{
+	return FAILED;
+}
+
+/*
+ *	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_bus_reset);
+EXPORT_SYMBOL(qlogicfas408_device_reset);
+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);
+