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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 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++;
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"
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