--- /dev/null
+/* -*- 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/slab.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 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 = kzalloc(sizeof(*hostdata), GFP_KERNEL);
+ if (!hostdata) {
+ printk(KERN_ERR "NCR D700: SIOP%d: Failed to allocate host"
+ "data, detatching\n", siop);
+ return -ENOMEM;
+ }
+
+ 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 = ioport_map(region, 64);
+ hostdata->differential = (((1<<siop) & differential) != 0);
+ hostdata->clock = NCR_D700_CLOCK_MHZ;
+ hostdata->burst_length = 8;
+
+ /* 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;
+ host->base = region;
+ scsi_scan_host(host);
+
+ return 0;
+
+ detect_failed:
+ release_region(region, 64);
+ region_failed:
+ kfree(hostdata);
+
+ return ret;
+}
+
+static irqreturn_t
+NCR_D700_intr(int irq, void *data)
+{
+ 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]) == 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 = kzalloc(sizeof(*p), GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+
+ p->dev = dev;
+ snprintf(p->name, sizeof(p->name), "D700(%s)", dev_name(dev));
+ if (request_irq(irq, NCR_D700_intr, IRQF_SHARED, 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, irq, slot,
+ 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);
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