NCR_D700.c
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- /* -*- 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/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 parametern");
- } else if(slot > MCA_MAX_SLOT_NR) {
- printk(KERN_WARNING "NCR D700: Illegal slot %d for id %dn", 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.comn"
- "NCR D700:n");
- banner = 0;
- }
- printk(KERN_NOTICE "NCR D700: found in slot %d irq = %d I/O base = 0x%xn", 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%02xn",
- 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, detatchingn", 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%xn", 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 %dn",
- 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, detatchingn", i);
- scsi_unregister(host);
- NCR_700_release(host);
- continue;
- }
- found++;
- mca_set_adapter_name(slot, "NCR D700 SCSI Adapter (version " NCR_D700_VERSION ")");
- }
- }
- 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"