| /* -*- 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/interrupt.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 __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; |
| } |
| |
| /* 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 = kmalloc(sizeof(*hostdata), GFP_KERNEL); |
| if (!hostdata) { |
| printk(KERN_ERR "NCR D700: SIOP%d: Failed to allocate host" |
| "data, detatching\n", siop); |
| return -ENOMEM; |
| } |
| memset(hostdata, 0, sizeof(*hostdata)); |
| |
| 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 = region; |
| hostdata->differential = (((1<<siop) & differential) != 0); |
| hostdata->clock = NCR_D700_CLOCK_MHZ; |
| |
| NCR_700_set_io_mapped(hostdata); |
| |
| /* 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; |
| scsi_scan_host(host); |
| |
| return 0; |
| |
| detect_failed: |
| release_region(host->base, 64); |
| region_failed: |
| kfree(hostdata); |
| |
| return ret; |
| } |
| |
| static int |
| NCR_D700_intr(int irq, void *data, struct pt_regs *regs) |
| { |
| 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], regs) == 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 = kmalloc(sizeof(*p), GFP_KERNEL); |
| if (!p) |
| return -ENOMEM; |
| memset(p, '\0', sizeof(*p)); |
| p->dev = dev; |
| snprintf(p->name, sizeof(p->name), "D700(%s)", dev->bus_id); |
| if (request_irq(irq, NCR_D700_intr, SA_SHIRQ, 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, slot, irq, |
| 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); |