cregit-Linux how code gets into the kernel

Release 4.11 drivers/scsi/NCR_D700.c

Directory: drivers/scsi
/* -*- 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; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds220100.00%1100.00%
Total220100.00%1100.00%

/* 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; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig11347.88%19.09%
James Bottomley9439.83%654.55%
Linus Torvalds2611.02%19.09%
Yoann Padioleau10.42%19.09%
Adrian Bunk10.42%19.09%
Mark Haverkamp10.42%19.09%
Total236100.00%11100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
James Bottomley7798.72%150.00%
Zhenwen Xu11.28%150.00%
Total78100.00%2100.00%

/* 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; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig22442.67%18.33%
Linus Torvalds15329.14%18.33%
James Bottomley14327.24%758.33%
Kay Sievers30.57%18.33%
Thomas Gleixner10.19%18.33%
Mariusz Kozlowski10.19%18.33%
Total525100.00%12100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds3768.52%150.00%
Christoph Hellwig1731.48%150.00%
Total54100.00%2100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig5294.55%150.00%
Linus Torvalds35.45%150.00%
Total55100.00%2100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
James Bottomley2686.67%150.00%
Christoph Hellwig413.33%150.00%
Total30100.00%2100.00%


static void __exit NCR_D700_exit(void) { mca_unregister_driver(&NCR_D700_driver); }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig1493.33%150.00%
Linus Torvalds16.67%150.00%
Total15100.00%2100.00%

module_init(NCR_D700_init); module_exit(NCR_D700_exit); __setup("NCR_D700=", param_setup);

Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds53736.81%13.85%
Christoph Hellwig48833.45%27.69%
James Bottomley40727.90%1142.31%
Arnaldo Carvalho de Melo80.55%13.85%
Andrew Morton40.27%13.85%
Adrian Bunk30.21%27.69%
Tejun Heo30.21%13.85%
Kay Sievers30.21%13.85%
Yoann Padioleau10.07%13.85%
Arjan van de Ven10.07%13.85%
Mark Haverkamp10.07%13.85%
Thomas Gleixner10.07%13.85%
Mariusz Kozlowski10.07%13.85%
Zhenwen Xu10.07%13.85%
Total1459100.00%26100.00%
Directory: drivers/scsi
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