Linux-2.6.12-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, 406 insertions, 0 deletions

diff --git a/drivers/scsi/NCR_D700.c b/drivers/scsi/NCR_D700.c
new file mode 100644
index 00000000000..507751941f1
--- /dev/null
+++ b/drivers/scsi/NCR_D700.c
@@ -0,0 +1,406 @@
+/* -*- 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 2.2
+ *
+ * Added mca_set_adapter_name().
+ *
+ * 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 "2.2"
+
+#include <linux/blkdev.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mca.h>
+#include <linux/interrupt.h>
+#include <asm/io.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_transport.h>
+#include <scsi/scsi_transport_spi.h>
+
+#include "53c700.h"
+#include "NCR_D700.h"
+
+static char *NCR_D700;		/* command line from insmod */
+
+MODULE_AUTHOR("James Bottomley");
+MODULE_DESCRIPTION("NCR Dual700 SCSI Driver");
+MODULE_LICENSE("GPL");
+module_param(NCR_D700, charp, 0);
+
+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;
+}
+
+/* Host template.  The 53c700 routine NCR_700_detect will
+ * fill in all of the missing routines */
+static struct scsi_host_template NCR_D700_driver_template = {
+	.module			= THIS_MODULE,
+	.name			= "NCR Dual 700 MCA",
+	.proc_name		= "NCR_D700",
+	.this_id		= 7,
+};
+
+/* We needs this helper because we have two hosts per struct device */
+struct NCR_D700_private {
+	struct device		*dev;
+	struct Scsi_Host	*hosts[2];
+	char			name[30];
+	char			pad;
+};
+
+static int 
+NCR_D700_probe_one(struct NCR_D700_private *p, int siop, int irq,
+		   int slot, u32 region, int differential)
+{
+	struct NCR_700_Host_Parameters *hostdata;
+	struct Scsi_Host *host;
+	int ret;
+
+	hostdata = kmalloc(sizeof(*hostdata), GFP_KERNEL);
+	if (!hostdata) {
+		printk(KERN_ERR "NCR D700: SIOP%d: Failed to allocate host"
+		       "data, detatching\n", siop);
+		return -ENOMEM;
+	}
+	memset(hostdata, 0, sizeof(*hostdata));
+
+	if (!request_region(region, 64, "NCR_D700")) {
+		printk(KERN_ERR "NCR D700: Failed to reserve IO region 0x%x\n",
+				region);
+		ret = -ENODEV;
+		goto region_failed;
+	}
+		
+	/* Fill in the three required pieces of hostdata */
+	hostdata->base = region;
+	hostdata->differential = (((1<<siop) & differential) != 0);
+	hostdata->clock = NCR_D700_CLOCK_MHZ;
+
+	NCR_700_set_io_mapped(hostdata);
+
+	/* and register the siop */
+	host = NCR_700_detect(&NCR_D700_driver_template, hostdata, p->dev);
+	if (!host) {
+		ret = -ENOMEM;
+		goto detect_failed;
+	}
+
+	p->hosts[siop] = host;
+	/* FIXME: read this from SUS */
+	host->this_id = id_array[slot * 2 + siop];
+	host->irq = irq;
+	scsi_scan_host(host);
+
+	return 0;
+
+ detect_failed:
+	release_region(host->base, 64);
+ region_failed:
+	kfree(hostdata);
+
+	return ret;
+}
+
+static int
+NCR_D700_intr(int irq, void *data, struct pt_regs *regs)
+{
+	struct NCR_D700_private *p = (struct NCR_D700_private *)data;
+	int i, found = 0;
+
+	for (i = 0; i < 2; i++)
+		if (p->hosts[i] &&
+		    NCR_700_intr(irq, p->hosts[i], regs) == IRQ_HANDLED)
+			found++;
+
+	return found ? IRQ_HANDLED : IRQ_NONE;
+}
+
+/* Detect a D700 card.  Note, because of the setup --- 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
+NCR_D700_probe(struct device *dev)
+{
+	struct NCR_D700_private *p;
+	int differential;
+	static int banner = 1;
+	struct mca_device *mca_dev = to_mca_device(dev);
+	int slot = mca_dev->slot;
+	int found = 0;
+	int irq, i;
+	int pos3j, pos3k, pos3a, pos3b, pos4;
+	__u32 base_addr, offset_addr;
+
+	/* enable board interrupt */
+	pos4 = mca_device_read_pos(mca_dev, 4);
+	pos4 |= 0x4;
+	mca_device_write_pos(mca_dev, 4, pos4);
+
+	mca_device_write_pos(mca_dev, 6, 9);
+	pos3j = mca_device_read_pos(mca_dev, 3);
+	mca_device_write_pos(mca_dev, 6, 10);
+	pos3k = mca_device_read_pos(mca_dev, 3);
+	mca_device_write_pos(mca_dev, 6, 0);
+	pos3a = mca_device_read_pos(mca_dev, 3);
+	mca_device_write_pos(mca_dev, 6, 1);
+	pos3b = mca_device_read_pos(mca_dev, 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;
+	}
+	/* now do the bus related transforms */
+	irq = mca_device_transform_irq(mca_dev, irq);
+	base_addr = mca_device_transform_ioport(mca_dev, base_addr);
+	offset_addr = mca_device_transform_ioport(mca_dev, offset_addr);
+
+	printk(KERN_NOTICE "NCR D700: found in slot %d  irq = %d  I/O base = 0x%x\n", slot, irq, offset_addr);
+
+	/*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;
+	}
+
+	p = kmalloc(sizeof(*p), GFP_KERNEL);
+	if (!p)
+		return -ENOMEM;
+	memset(p, '\0', sizeof(*p));
+	p->dev = dev;
+	snprintf(p->name, sizeof(p->name), "D700(%s)", dev->bus_id);
+	if (request_irq(irq, NCR_D700_intr, SA_SHIRQ, p->name, p)) {
+		printk(KERN_ERR "D700: request_irq failed\n");
+		kfree(p);
+		return -EBUSY;
+	}
+	/* plumb in both 700 chips */
+	for (i = 0; i < 2; i++) {
+		int err;
+
+		if ((err = NCR_D700_probe_one(p, i, slot, irq,
+					      offset_addr + (0x80 * i),
+					      differential)) != 0)
+			printk("D700: SIOP%d: probe failed, error = %d\n",
+			       i, err);
+		else
+			found++;
+	}
+
+	if (!found) {
+		kfree(p);
+		return -ENODEV;
+	}
+
+	mca_device_set_claim(mca_dev, 1);
+	mca_device_set_name(mca_dev, "NCR_D700");
+	dev_set_drvdata(dev, p);
+	return 0;
+}
+
+static void
+NCR_D700_remove_one(struct Scsi_Host *host)
+{
+	scsi_remove_host(host);
+	NCR_700_release(host);
+	kfree((struct NCR_700_Host_Parameters *)host->hostdata[0]);
+	free_irq(host->irq, host);
+	release_region(host->base, 64);
+}
+
+static int
+NCR_D700_remove(struct device *dev)
+{
+	struct NCR_D700_private *p = dev_get_drvdata(dev);
+	int i;
+
+	for (i = 0; i < 2; i++)
+		NCR_D700_remove_one(p->hosts[i]);
+
+	kfree(p);
+	return 0;
+}
+
+static short NCR_D700_id_table[] = { NCR_D700_MCA_ID, 0 };
+
+static struct mca_driver NCR_D700_driver = {
+	.id_table = NCR_D700_id_table,
+	.driver = {
+		.name		= "NCR_D700",
+		.bus		= &mca_bus_type,
+		.probe		= NCR_D700_probe,
+		.remove		= NCR_D700_remove,
+	},
+};
+
+static int __init NCR_D700_init(void)
+{
+#ifdef MODULE
+	if (NCR_D700)
+		param_setup(NCR_D700);
+#endif
+
+	return mca_register_driver(&NCR_D700_driver);
+}
+
+static void __exit NCR_D700_exit(void)
+{
+	mca_unregister_driver(&NCR_D700_driver);
+}
+
+module_init(NCR_D700_init);
+module_exit(NCR_D700_exit);
+
+__setup("NCR_D700=", param_setup);