406 lines
10 KiB
C
406 lines
10 KiB
C
/* -*- mode: c; c-basic-offset: 8 -*- */
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/* NCR Dual 700 MCA SCSI Driver
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*
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* Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
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**-----------------------------------------------------------------------------
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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**
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**-----------------------------------------------------------------------------
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*/
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/* Notes:
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*
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* Most of the work is done in the chip specific module, 53c700.o
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*
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* TODO List:
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*
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* 1. Extract the SCSI ID from the voyager CMOS table (necessary to
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* support multi-host environments.
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*
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* */
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/* CHANGELOG
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*
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* Version 2.2
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*
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* Added mca_set_adapter_name().
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*
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* Version 2.1
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*
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* Modularise the driver into a Board piece (this file) and a chip
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* piece 53c700.[ch] and 53c700.scr, added module options. You can
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* now specify the scsi id by the parameters
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*
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* NCR_D700=slot:<n> [siop:<n>] id:<n> ....
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*
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* They need to be comma separated if compiled into the kernel
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*
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* Version 2.0
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*
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* Initial implementation of TCQ (Tag Command Queueing). TCQ is full
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* featured and uses the clock algorithm to keep track of outstanding
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* tags and guard against individual tag starvation. Also fixed a bug
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* in all of the 1.x versions where the D700_data_residue() function
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* was returning results off by 32 bytes (and thus causing the same 32
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* bytes to be written twice corrupting the data block). It turns out
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* the 53c700 only has a 6 bit DBC and DFIFO registers not 7 bit ones
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* like the 53c710 (The 710 is the only data manual still available,
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* which I'd been using to program the 700).
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*
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* Version 1.2
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*
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* Much improved message handling engine
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*
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* Version 1.1
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*
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* Add code to handle selection reasonably correctly. By the time we
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* get the selection interrupt, we've already responded, but drop off the
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* bus and hope the selector will go away.
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*
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* Version 1.0:
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*
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* Initial release. Fully functional except for procfs and tag
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* command queueing. Has only been tested on cards with 53c700-66
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* chips and only single ended. Features are
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*
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* 1. Synchronous data transfers to offset 8 (limit of 700-66) and
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* 100ns (10MHz) limit of SCSI-2
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*
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* 2. Disconnection and reselection
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*
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* Testing:
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*
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* I've only really tested this with the 700-66 chip, but have done
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* soak tests in multi-device environments to verify that
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* disconnections and reselections are being processed correctly.
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* */
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#define NCR_D700_VERSION "2.2"
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#include <linux/blkdev.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mca.h>
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#include <linux/slab.h>
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#include <asm/io.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_transport.h>
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#include <scsi/scsi_transport_spi.h>
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#include "53c700.h"
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#include "NCR_D700.h"
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static char *NCR_D700; /* command line from insmod */
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MODULE_AUTHOR("James Bottomley");
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MODULE_DESCRIPTION("NCR Dual700 SCSI Driver");
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MODULE_LICENSE("GPL");
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module_param(NCR_D700, charp, 0);
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static __u8 id_array[2*(MCA_MAX_SLOT_NR + 1)] =
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{ [0 ... 2*(MCA_MAX_SLOT_NR + 1)-1] = 7 };
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#ifdef MODULE
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#define ARG_SEP ' '
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#else
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#define ARG_SEP ','
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#endif
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static int __init
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param_setup(char *string)
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{
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char *pos = string, *next;
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int slot = -1, siop = -1;
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while(pos != NULL && (next = strchr(pos, ':')) != NULL) {
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int val = (int)simple_strtoul(++next, NULL, 0);
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if(!strncmp(pos, "slot:", 5))
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slot = val;
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else if(!strncmp(pos, "siop:", 5))
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siop = val;
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else if(!strncmp(pos, "id:", 3)) {
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if(slot == -1) {
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printk(KERN_WARNING "NCR D700: Must specify slot for id parameter\n");
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} else if(slot > MCA_MAX_SLOT_NR) {
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printk(KERN_WARNING "NCR D700: Illegal slot %d for id %d\n", slot, val);
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} else {
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if(siop != 0 && siop != 1) {
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id_array[slot*2] = val;
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id_array[slot*2 + 1] =val;
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} else {
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id_array[slot*2 + siop] = val;
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}
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}
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}
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if((pos = strchr(pos, ARG_SEP)) != NULL)
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pos++;
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}
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return 1;
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}
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/* Host template. The 53c700 routine NCR_700_detect will
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* fill in all of the missing routines */
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static struct scsi_host_template NCR_D700_driver_template = {
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.module = THIS_MODULE,
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.name = "NCR Dual 700 MCA",
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.proc_name = "NCR_D700",
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.this_id = 7,
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};
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/* We needs this helper because we have two hosts per struct device */
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struct NCR_D700_private {
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struct device *dev;
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struct Scsi_Host *hosts[2];
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char name[30];
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char pad;
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};
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static int
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NCR_D700_probe_one(struct NCR_D700_private *p, int siop, int irq,
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int slot, u32 region, int differential)
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{
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struct NCR_700_Host_Parameters *hostdata;
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struct Scsi_Host *host;
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int ret;
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hostdata = kzalloc(sizeof(*hostdata), GFP_KERNEL);
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if (!hostdata) {
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printk(KERN_ERR "NCR D700: SIOP%d: Failed to allocate host"
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"data, detatching\n", siop);
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return -ENOMEM;
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}
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if (!request_region(region, 64, "NCR_D700")) {
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printk(KERN_ERR "NCR D700: Failed to reserve IO region 0x%x\n",
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region);
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ret = -ENODEV;
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goto region_failed;
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}
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/* Fill in the three required pieces of hostdata */
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hostdata->base = ioport_map(region, 64);
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hostdata->differential = (((1<<siop) & differential) != 0);
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hostdata->clock = NCR_D700_CLOCK_MHZ;
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hostdata->burst_length = 8;
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/* and register the siop */
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host = NCR_700_detect(&NCR_D700_driver_template, hostdata, p->dev);
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if (!host) {
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ret = -ENOMEM;
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goto detect_failed;
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}
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p->hosts[siop] = host;
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/* FIXME: read this from SUS */
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host->this_id = id_array[slot * 2 + siop];
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host->irq = irq;
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host->base = region;
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scsi_scan_host(host);
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return 0;
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detect_failed:
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release_region(region, 64);
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region_failed:
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kfree(hostdata);
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return ret;
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}
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static irqreturn_t
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NCR_D700_intr(int irq, void *data)
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{
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struct NCR_D700_private *p = (struct NCR_D700_private *)data;
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int i, found = 0;
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for (i = 0; i < 2; i++)
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if (p->hosts[i] &&
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NCR_700_intr(irq, p->hosts[i]) == IRQ_HANDLED)
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found++;
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return found ? IRQ_HANDLED : IRQ_NONE;
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}
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/* Detect a D700 card. Note, because of the setup --- the chips are
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* essentially connectecd to the MCA bus independently, it is easier
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* to set them up as two separate host adapters, rather than one
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* adapter with two channels */
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static int
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NCR_D700_probe(struct device *dev)
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{
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struct NCR_D700_private *p;
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int differential;
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static int banner = 1;
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struct mca_device *mca_dev = to_mca_device(dev);
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int slot = mca_dev->slot;
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int found = 0;
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int irq, i;
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int pos3j, pos3k, pos3a, pos3b, pos4;
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__u32 base_addr, offset_addr;
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/* enable board interrupt */
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pos4 = mca_device_read_pos(mca_dev, 4);
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pos4 |= 0x4;
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mca_device_write_pos(mca_dev, 4, pos4);
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mca_device_write_pos(mca_dev, 6, 9);
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pos3j = mca_device_read_pos(mca_dev, 3);
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mca_device_write_pos(mca_dev, 6, 10);
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pos3k = mca_device_read_pos(mca_dev, 3);
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mca_device_write_pos(mca_dev, 6, 0);
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pos3a = mca_device_read_pos(mca_dev, 3);
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mca_device_write_pos(mca_dev, 6, 1);
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pos3b = mca_device_read_pos(mca_dev, 3);
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base_addr = ((pos3j << 8) | pos3k) & 0xfffffff0;
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offset_addr = ((pos3a << 8) | pos3b) & 0xffffff70;
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irq = (pos4 & 0x3) + 11;
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if(irq >= 13)
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irq++;
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if(banner) {
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printk(KERN_NOTICE "NCR D700: Driver Version " NCR_D700_VERSION "\n"
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"NCR D700: Copyright (c) 2001 by James.Bottomley@HansenPartnership.com\n"
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"NCR D700:\n");
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banner = 0;
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}
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/* now do the bus related transforms */
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irq = mca_device_transform_irq(mca_dev, irq);
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base_addr = mca_device_transform_ioport(mca_dev, base_addr);
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offset_addr = mca_device_transform_ioport(mca_dev, offset_addr);
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printk(KERN_NOTICE "NCR D700: found in slot %d irq = %d I/O base = 0x%x\n", slot, irq, offset_addr);
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/*outb(BOARD_RESET, base_addr);*/
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/* clear any pending interrupts */
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(void)inb(base_addr + 0x08);
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/* get modctl, used later for setting diff bits */
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switch(differential = (inb(base_addr + 0x08) >> 6)) {
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case 0x00:
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/* only SIOP1 differential */
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differential = 0x02;
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break;
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case 0x01:
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/* Both SIOPs differential */
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differential = 0x03;
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break;
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case 0x03:
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/* No SIOPs differential */
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differential = 0x00;
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break;
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default:
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printk(KERN_ERR "D700: UNEXPECTED DIFFERENTIAL RESULT 0x%02x\n",
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differential);
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differential = 0x00;
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break;
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}
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p = kzalloc(sizeof(*p), GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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p->dev = dev;
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snprintf(p->name, sizeof(p->name), "D700(%s)", dev_name(dev));
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if (request_irq(irq, NCR_D700_intr, IRQF_SHARED, p->name, p)) {
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printk(KERN_ERR "D700: request_irq failed\n");
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kfree(p);
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return -EBUSY;
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}
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/* plumb in both 700 chips */
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for (i = 0; i < 2; i++) {
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int err;
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if ((err = NCR_D700_probe_one(p, i, irq, slot,
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offset_addr + (0x80 * i),
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differential)) != 0)
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printk("D700: SIOP%d: probe failed, error = %d\n",
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i, err);
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else
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found++;
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}
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if (!found) {
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kfree(p);
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return -ENODEV;
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}
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mca_device_set_claim(mca_dev, 1);
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mca_device_set_name(mca_dev, "NCR_D700");
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dev_set_drvdata(dev, p);
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return 0;
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}
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static void
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NCR_D700_remove_one(struct Scsi_Host *host)
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{
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scsi_remove_host(host);
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NCR_700_release(host);
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kfree((struct NCR_700_Host_Parameters *)host->hostdata[0]);
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free_irq(host->irq, host);
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release_region(host->base, 64);
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}
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static int
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NCR_D700_remove(struct device *dev)
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{
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struct NCR_D700_private *p = dev_get_drvdata(dev);
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int i;
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for (i = 0; i < 2; i++)
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NCR_D700_remove_one(p->hosts[i]);
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kfree(p);
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return 0;
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}
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static short NCR_D700_id_table[] = { NCR_D700_MCA_ID, 0 };
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static struct mca_driver NCR_D700_driver = {
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.id_table = NCR_D700_id_table,
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.driver = {
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.name = "NCR_D700",
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.bus = &mca_bus_type,
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.probe = NCR_D700_probe,
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.remove = NCR_D700_remove,
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},
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};
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static int __init NCR_D700_init(void)
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{
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#ifdef MODULE
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if (NCR_D700)
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param_setup(NCR_D700);
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#endif
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return mca_register_driver(&NCR_D700_driver);
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}
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static void __exit NCR_D700_exit(void)
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{
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mca_unregister_driver(&NCR_D700_driver);
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}
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module_init(NCR_D700_init);
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module_exit(NCR_D700_exit);
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__setup("NCR_D700=", param_setup);
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