diff options
Diffstat (limited to 'kernel/drivers/scsi/NCR_D700.c')
| -rw-r--r-- | kernel/drivers/scsi/NCR_D700.c | 405 |
1 files changed, 405 insertions, 0 deletions
diff --git a/kernel/drivers/scsi/NCR_D700.c b/kernel/drivers/scsi/NCR_D700.c new file mode 100644 index 000000000..b39a2409a --- /dev/null +++ b/kernel/drivers/scsi/NCR_D700.c @@ -0,0 +1,405 @@ +/* -*- 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); |