patch-2.4.10 linux/drivers/scsi/NCR_D700.c

• Lines: 327
• Date: Sun Sep 9 11:58:36 2001
• Orig file: v2.4.9/linux/drivers/scsi/NCR_D700.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.9/linux/drivers/scsi/NCR_D700.c linux/drivers/scsi/NCR_D700.c
@@ -0,0 +1,326 @@
+/* -*- mode: c; c-basic-offset: 8 -*- */
+
+/* NCR Dual 700 MCA SCSI Driver
+ *
+ * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
+**-----------------------------------------------------------------------------
+**  
+**  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 program; if not, write to the Free Software
+**  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+**
+**-----------------------------------------------------------------------------
+ */
+
+/* Notes:
+ *
+ * Most of the work is done in the chip specific module, 53c700.o
+ *
+ * TODO List:
+ *
+ * 1. Extract the SCSI ID from the voyager CMOS table (necessary to
+ *    support multi-host environments.
+ *
+ * */
+
+
+/* CHANGELOG 
+ *
+ * Version 2.1
+ *
+ * Modularise the driver into a Board piece (this file) and a chip
+ * piece 53c700.[ch] and 53c700.scr, added module options.  You can
+ * now specify the scsi id by the parameters
+ *
+ * NCR_D700=slot:<n> [siop:<n>] id:<n> ....
+ *
+ * They need to be comma separated if compiled into the kernel
+ *
+ * Version 2.0
+ *
+ * Initial implementation of TCQ (Tag Command Queueing).  TCQ is full
+ * featured and uses the clock algorithm to keep track of outstanding
+ * tags and guard against individual tag starvation.  Also fixed a bug
+ * in all of the 1.x versions where the D700_data_residue() function
+ * was returning results off by 32 bytes (and thus causing the same 32
+ * bytes to be written twice corrupting the data block).  It turns out
+ * the 53c700 only has a 6 bit DBC and DFIFO registers not 7 bit ones
+ * like the 53c710 (The 710 is the only data manual still available,
+ * which I'd been using to program the 700).
+ *
+ * Version 1.2
+ *
+ * Much improved message handling engine
+ *
+ * Version 1.1
+ *
+ * Add code to handle selection reasonably correctly.  By the time we
+ * get the selection interrupt, we've already responded, but drop off the
+ * bus and hope the selector will go away.
+ *
+ * Version 1.0:
+ *
+ *   Initial release.  Fully functional except for procfs and tag
+ * command queueing.  Has only been tested on cards with 53c700-66
+ * chips and only single ended. Features are
+ *
+ * 1. Synchronous data transfers to offset 8 (limit of 700-66) and
+ *    100ns (10MHz) limit of SCSI-2
+ *
+ * 2. Disconnection and reselection
+ *
+ * Testing:
+ * 
+ *  I've only really tested this with the 700-66 chip, but have done
+ * soak tests in multi-device environments to verify that
+ * disconnections and reselections are being processed correctly.
+ * */
+
+#define NCR_D700_VERSION "2.1"
+
+#include <linux/config.h>
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/spinlock.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/proc_fs.h>
+#include <linux/init.h>
+#include <linux/mca.h>
+#include <asm/dma.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/byteorder.h>
+#include <linux/blk.h>
+#include <linux/module.h>
+
+
+#include "scsi.h"
+#include "hosts.h"
+#include "constants.h"
+
+#include "53c700.h"
+#include "NCR_D700.h"
+
+#ifndef CONFIG_MCA
+#error "NCR_D700 driver only compiles for MCA"
+#endif
+
+#ifdef NCR_D700_DEBUG
+#define STATIC
+#else
+#define STATIC static
+#endif
+
+char *NCR_D700;			/* command line from insmod */
+
+MODULE_AUTHOR("James Bottomley");
+MODULE_DESCRIPTION("NCR Dual700 SCSI Driver");
+MODULE_LICENSE("GPL");
+MODULE_PARM(NCR_D700, "s");
+
+static __u8 __initdata id_array[2*(MCA_MAX_SLOT_NR + 1)] =
+	{ [0 ... 2*(MCA_MAX_SLOT_NR + 1)-1] = 7 };
+
+#ifdef MODULE
+#define ARG_SEP ' '
+#else
+#define ARG_SEP ','
+#endif
+
+static int __init
+param_setup(char *string)
+{
+	char *pos = string, *next;
+	int slot = -1, siop = -1;
+
+	while(pos != NULL && (next = strchr(pos, ':')) != NULL) {
+		int val = (int)simple_strtoul(++next, NULL, 0);
+
+		if(!strncmp(pos, "slot:", 5))
+			slot = val;
+		else if(!strncmp(pos, "siop:", 5))
+			siop = val;
+		else if(!strncmp(pos, "id:", 3)) {
+			if(slot == -1) {
+				printk(KERN_WARNING "NCR D700: Must specify slot for id parameter\n");
+			} else if(slot > MCA_MAX_SLOT_NR) {
+				printk(KERN_WARNING "NCR D700: Illegal slot %d for id %d\n", slot, val);
+			} else {
+				if(siop != 0 && siop != 1) {
+					id_array[slot*2] = val;
+					id_array[slot*2 + 1] =val;
+				} else {
+					id_array[slot*2 + siop] = val;
+				}
+			}
+		}
+		if((pos = strchr(pos, ARG_SEP)) != NULL)
+			pos++;
+	}
+	return 1;
+}
+
+#ifndef MODULE
+__setup("NCR_D700=", param_setup);
+#endif
+
+/* Detect a D700 card.  Note, because of the set up---the chips are
+ * essentially connectecd to the MCA bus independently, it is easier
+ * to set them up as two separate host adapters, rather than one
+ * adapter with two channels */
+STATIC int __init
+D700_detect(Scsi_Host_Template *tpnt)
+{
+	int slot = 0;
+	int found = 0;
+	int differential;
+	int banner = 1;
+
+	if(!MCA_bus)
+		return 0;
+
+#ifdef MODULE
+	if(NCR_D700)
+		param_setup(NCR_D700);
+#endif
+
+	for(slot = 0; (slot = mca_find_adapter(NCR_D700_MCA_ID, slot)) != MCA_NOTFOUND; slot++) {
+		int irq, i;
+		int pos3j, pos3k, pos3a, pos3b, pos4;
+		__u32 base_addr, offset_addr;
+		struct Scsi_Host *host = NULL;
+
+		/* enable board interrupt */
+		pos4 = mca_read_pos(slot, 4);
+		pos4 |= 0x4;
+		mca_write_pos(slot, 4, pos4);
+
+		mca_write_pos(slot, 6, 9);
+		pos3j = mca_read_pos(slot, 3);
+		mca_write_pos(slot, 6, 10);
+		pos3k = mca_read_pos(slot, 3);
+		mca_write_pos(slot, 6, 0);
+		pos3a = mca_read_pos(slot, 3);
+		mca_write_pos(slot, 6, 1);
+		pos3b = mca_read_pos(slot, 3);
+
+		base_addr = ((pos3j << 8) | pos3k) & 0xfffffff0;
+		offset_addr = ((pos3a << 8) | pos3b) & 0xffffff70;
+
+		irq = (pos4 & 0x3) + 11;
+		if(irq >= 13)
+			irq++;
+		if(banner) {
+			printk(KERN_NOTICE "NCR D700: Driver Version " NCR_D700_VERSION "\n"
+			       "NCR D700:  Copyright (c) 2001 by James.Bottomley@HansenPartnership.com\n"
+			       "NCR D700:\n");
+			banner = 0;
+		}
+		printk(KERN_NOTICE "NCR D700: found in slot %d  irq = %d  I/O base = 0x%x\n", slot, irq, offset_addr);
+
+		tpnt->proc_name = "NCR_D700";
+
+		/*outb(BOARD_RESET, base_addr);*/
+
+		/* clear any pending interrupts */
+		(void)inb(base_addr + 0x08);
+		/* get modctl, used later for setting diff bits */
+		switch(differential = (inb(base_addr + 0x08) >> 6)) {
+		case 0x00:
+			/* only SIOP1 differential */
+			differential = 0x02;
+			break;
+		case 0x01:
+			/* Both SIOPs differential */
+			differential = 0x03;
+			break;
+		case 0x03:
+			/* No SIOPs differential */
+			differential = 0x00;
+			break;
+		default:
+			printk(KERN_ERR "D700: UNEXPECTED DIFFERENTIAL RESULT 0x%02x\n",
+			       differential);
+			differential = 0x00;
+			break;
+		}
+
+		/* plumb in both 700 chips */
+		for(i=0; i<2; i++) {
+			__u32 region = offset_addr | (0x80 * i);
+			struct NCR_700_Host_Parameters *hostdata =
+				kmalloc(sizeof(struct NCR_700_Host_Parameters),
+					GFP_KERNEL);
+			if(hostdata == NULL) {
+				printk(KERN_ERR "NCR D700: Failed to allocate host data for channel %d, detatching\n", i);
+				continue;
+			}
+			memset(hostdata, 0, sizeof(struct NCR_700_Host_Parameters));
+			if(request_region(region, 64, "NCR_D700") == NULL) {
+				printk(KERN_ERR "NCR D700: Failed to reserve IO region 0x%x\n", region);
+				kfree(hostdata);
+				continue;
+			}
+
+			/* Fill in the three required pieces of hostdata */
+			hostdata->base = region;
+			hostdata->differential = (((1<<i) & differential) != 0);
+			hostdata->clock = NCR_D700_CLOCK_MHZ;
+			/* and register the chip */
+			if((host = NCR_700_detect(tpnt, hostdata)) == NULL) {
+				kfree(hostdata);
+				release_region(host->base, 64);
+				continue;
+			}
+			host->irq = irq;
+			/* FIXME: Read this from SUS */
+			host->this_id = id_array[slot * 2 + i];
+			printk(KERN_NOTICE "NCR D700: SIOP%d, SCSI id is %d\n",
+			       i, host->this_id);
+			if(request_irq(irq, NCR_700_intr, SA_SHIRQ, "NCR_D700", host)) {
+				printk(KERN_ERR "NCR D700, channel %d: irq problem, detatching\n", i);
+				scsi_unregister(host);
+				NCR_700_release(host);
+				continue;
+			}
+			found++;
+		}
+	}
+
+	return found;
+}
+
+
+STATIC int
+D700_release(struct Scsi_Host *host)
+{
+	struct D700_Host_Parameters *hostdata = 
+		(struct D700_Host_Parameters *)host->hostdata[0];
+
+	NCR_700_release(host);
+	kfree(hostdata);
+	free_irq(host->irq, host);
+	release_region(host->base, 64);
+	return 1;
+}
+
+
+static Scsi_Host_Template driver_template = NCR_D700_SCSI;
+
+#include "scsi_module.c"
+