powertec.c
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上传日期:2013-04-10
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文件大小:14k
- /*
- * linux/drivers/acorn/scsi/powertec.c
- *
- * Copyright (C) 1997-2000 Russell King
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This driver is based on experimentation. Hence, it may have made
- * assumptions about the particular card that I have available, and
- * may not be reliable!
- *
- * Changelog:
- * 01-10-1997 RMK Created, READONLY version.
- * 15-02-1998 RMK Added DMA support and hardware definitions.
- * 15-04-1998 RMK Only do PIO if FAS216 will allow it.
- * 02-05-1998 RMK Moved DMA sg list into per-interface structure.
- * 27-06-1998 RMK Changed asm/delay.h to linux/delay.h
- * 02-04-2000 RMK Updated for new error handling code.
- */
- #include <linux/module.h>
- #include <linux/blk.h>
- #include <linux/kernel.h>
- #include <linux/string.h>
- #include <linux/ioport.h>
- #include <linux/sched.h>
- #include <linux/proc_fs.h>
- #include <linux/unistd.h>
- #include <linux/stat.h>
- #include <linux/delay.h>
- #include <linux/pci.h>
- #include <linux/init.h>
- #include <asm/dma.h>
- #include <asm/ecard.h>
- #include <asm/io.h>
- #include <asm/irq.h>
- #include <asm/pgtable.h>
- #include "../../scsi/sd.h"
- #include "../../scsi/hosts.h"
- #include "fas216.h"
- #include <scsi/scsicam.h>
- /* Configuration */
- #define POWERTEC_XTALFREQ 40
- #define POWERTEC_ASYNC_PERIOD 200
- #define POWERTEC_SYNC_DEPTH 7
- /*
- * List of devices that the driver will recognise
- */
- #define POWERTECSCSI_LIST { MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI }
- #define POWERTEC_FAS216_OFFSET 0xc00
- #define POWERTEC_FAS216_SHIFT 4
- #define POWERTEC_INTR_STATUS 0x800
- #define POWERTEC_INTR_BIT 0x80
- #define POWERTEC_RESET_CONTROL 0x406
- #define POWERTEC_RESET_BIT 1
- #define POWERTEC_TERM_CONTROL 0x806
- #define POWERTEC_TERM_ENABLE 1
- #define POWERTEC_INTR_CONTROL 0x407
- #define POWERTEC_INTR_ENABLE 1
- #define POWERTEC_INTR_DISABLE 0
- /*
- * Version
- */
- #define VER_MAJOR 0
- #define VER_MINOR 0
- #define VER_PATCH 5
- static struct expansion_card *ecs[MAX_ECARDS];
- /*
- * Use term=0,1,0,0,0 to turn terminators on/off
- */
- static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
- #define NR_SG 256
- typedef struct {
- FAS216_Info info;
- struct {
- unsigned int term_port;
- unsigned int terms;
- } control;
- /* other info... */
- struct scatterlist sg[NR_SG]; /* Scatter DMA list */
- } PowerTecScsi_Info;
- /* Prototype: void powertecscsi_irqenable(ec, irqnr)
- * Purpose : Enable interrupts on Powertec SCSI card
- * Params : ec - expansion card structure
- * : irqnr - interrupt number
- */
- static void
- powertecscsi_irqenable(struct expansion_card *ec, int irqnr)
- {
- unsigned int port = (unsigned int)ec->irq_data;
- outb(POWERTEC_INTR_ENABLE, port);
- }
- /* Prototype: void powertecscsi_irqdisable(ec, irqnr)
- * Purpose : Disable interrupts on Powertec SCSI card
- * Params : ec - expansion card structure
- * : irqnr - interrupt number
- */
- static void
- powertecscsi_irqdisable(struct expansion_card *ec, int irqnr)
- {
- unsigned int port = (unsigned int)ec->irq_data;
- outb(POWERTEC_INTR_DISABLE, port);
- }
- static const expansioncard_ops_t powertecscsi_ops = {
- powertecscsi_irqenable,
- powertecscsi_irqdisable,
- NULL,
- NULL,
- NULL,
- NULL
- };
- /* Prototype: void powertecscsi_terminator_ctl(host, on_off)
- * Purpose : Turn the Powertec SCSI terminators on or off
- * Params : host - card to turn on/off
- * : on_off - !0 to turn on, 0 to turn off
- */
- static void
- powertecscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
- {
- PowerTecScsi_Info *info = (PowerTecScsi_Info *)host->hostdata;
- if (on_off)
- info->control.terms = POWERTEC_TERM_ENABLE;
- else
- info->control.terms = 0;
- outb(info->control.terms, info->control.term_port);
- }
- /* Prototype: void powertecscsi_intr(irq, *dev_id, *regs)
- * Purpose : handle interrupts from Powertec SCSI card
- * Params : irq - interrupt number
- * dev_id - user-defined (Scsi_Host structure)
- * regs - processor registers at interrupt
- */
- static void
- powertecscsi_intr(int irq, void *dev_id, struct pt_regs *regs)
- {
- struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
- fas216_intr(host);
- }
- /* Prototype: fasdmatype_t powertecscsi_dma_setup(host, SCpnt, direction, min_type)
- * Purpose : initialises DMA/PIO
- * Params : host - host
- * SCpnt - command
- * direction - DMA on to/off of card
- * min_type - minimum DMA support that we must have for this transfer
- * Returns : type of transfer to be performed
- */
- static fasdmatype_t
- powertecscsi_dma_setup(struct Scsi_Host *host, Scsi_Pointer *SCp,
- fasdmadir_t direction, fasdmatype_t min_type)
- {
- PowerTecScsi_Info *info = (PowerTecScsi_Info *)host->hostdata;
- int dmach = host->dma_channel;
- if (dmach != NO_DMA &&
- (min_type == fasdma_real_all || SCp->this_residual >= 512)) {
- int bufs = SCp->buffers_residual;
- int pci_dir, dma_dir;
- if (bufs)
- memcpy(info->sg + 1, SCp->buffer + 1,
- sizeof(struct scatterlist) * bufs);
- info->sg[0].address = SCp->ptr;
- info->sg[0].page = NULL;
- info->sg[0].length = SCp->this_residual;
- if (direction == DMA_OUT)
- pci_dir = PCI_DMA_TODEVICE,
- dma_dir = DMA_MODE_WRITE;
- else
- pci_dir = PCI_DMA_FROMDEVICE,
- dma_dir = DMA_MODE_READ;
- pci_map_sg(NULL, info->sg, bufs + 1, pci_dir);
- disable_dma(dmach);
- set_dma_sg(dmach, info->sg, bufs + 1);
- set_dma_mode(dmach, dma_dir);
- enable_dma(dmach);
- return fasdma_real_all;
- }
- /*
- * If we're not doing DMA,
- * we'll do slow PIO
- */
- return fasdma_pio;
- }
- /* Prototype: int powertecscsi_dma_stop(host, SCpnt)
- * Purpose : stops DMA/PIO
- * Params : host - host
- * SCpnt - command
- */
- static void
- powertecscsi_dma_stop(struct Scsi_Host *host, Scsi_Pointer *SCp)
- {
- if (host->dma_channel != NO_DMA)
- disable_dma(host->dma_channel);
- }
- /* Prototype: int powertecscsi_detect(Scsi_Host_Template * tpnt)
- * Purpose : initialises PowerTec SCSI driver
- * Params : tpnt - template for this SCSI adapter
- * Returns : >0 if host found, 0 otherwise.
- */
- int
- powertecscsi_detect(Scsi_Host_Template *tpnt)
- {
- static const card_ids powertecscsi_cids[] =
- { POWERTECSCSI_LIST, { 0xffff, 0xffff} };
- int count = 0;
- struct Scsi_Host *host;
-
- tpnt->proc_name = "powertec";
- memset(ecs, 0, sizeof (ecs));
- ecard_startfind();
- while (1) {
- PowerTecScsi_Info *info;
- ecs[count] = ecard_find(0, powertecscsi_cids);
- if (!ecs[count])
- break;
- ecard_claim(ecs[count]);
- host = scsi_register(tpnt, sizeof (PowerTecScsi_Info));
- if (!host) {
- ecard_release(ecs[count]);
- break;
- }
- host->io_port = ecard_address(ecs[count], ECARD_IOC, ECARD_FAST);
- host->irq = ecs[count]->irq;
- host->dma_channel = ecs[count]->dma;
- info = (PowerTecScsi_Info *)host->hostdata;
- if (host->dma_channel != NO_DMA)
- set_dma_speed(host->dma_channel, 180);
- info->control.term_port = host->io_port + POWERTEC_TERM_CONTROL;
- info->control.terms = term[count] ? POWERTEC_TERM_ENABLE : 0;
- powertecscsi_terminator_ctl(host, info->control.terms);
- info->info.scsi.io_port =
- host->io_port + POWERTEC_FAS216_OFFSET;
- info->info.scsi.io_shift= POWERTEC_FAS216_SHIFT;
- info->info.scsi.irq = host->irq;
- info->info.ifcfg.clockrate = POWERTEC_XTALFREQ;
- info->info.ifcfg.select_timeout = 255;
- info->info.ifcfg.asyncperiod = POWERTEC_ASYNC_PERIOD;
- info->info.ifcfg.sync_max_depth = POWERTEC_SYNC_DEPTH;
- info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
- info->info.ifcfg.disconnect_ok = 1;
- info->info.ifcfg.wide_max_size = 0;
- info->info.dma.setup = powertecscsi_dma_setup;
- info->info.dma.pseudo = NULL;
- info->info.dma.stop = powertecscsi_dma_stop;
- ecs[count]->irqaddr = (unsigned char *)
- ioaddr(host->io_port + POWERTEC_INTR_STATUS);
- ecs[count]->irqmask = POWERTEC_INTR_BIT;
- ecs[count]->irq_data = (void *)
- (host->io_port + POWERTEC_INTR_CONTROL);
- ecs[count]->ops = (expansioncard_ops_t *)&powertecscsi_ops;
- request_region(host->io_port + POWERTEC_FAS216_OFFSET,
- 16 << POWERTEC_FAS216_SHIFT, "powertec2-fas");
- if (host->irq != NO_IRQ &&
- request_irq(host->irq, powertecscsi_intr,
- SA_INTERRUPT, "powertec", host)) {
- printk("scsi%d: IRQ%d not free, interrupts disabledn",
- host->host_no, host->irq);
- host->irq = NO_IRQ;
- info->info.scsi.irq = NO_IRQ;
- }
- if (host->dma_channel != NO_DMA &&
- request_dma(host->dma_channel, "powertec")) {
- printk("scsi%d: DMA%d not free, DMA disabledn",
- host->host_no, host->dma_channel);
- host->dma_channel = NO_DMA;
- }
- fas216_init(host);
- ++count;
- }
- return count;
- }
- /* Prototype: int powertecscsi_release(struct Scsi_Host * host)
- * Purpose : releases all resources used by this adapter
- * Params : host - driver host structure to return info for.
- */
- int powertecscsi_release(struct Scsi_Host *host)
- {
- int i;
- fas216_release(host);
- if (host->irq != NO_IRQ)
- free_irq(host->irq, host);
- if (host->dma_channel != NO_DMA)
- free_dma(host->dma_channel);
- release_region(host->io_port + POWERTEC_FAS216_OFFSET,
- 16 << POWERTEC_FAS216_SHIFT);
- for (i = 0; i < MAX_ECARDS; i++)
- if (ecs[i] &&
- host->io_port == ecard_address(ecs[i], ECARD_IOC, ECARD_FAST))
- ecard_release(ecs[i]);
- return 0;
- }
- /* Prototype: const char *powertecscsi_info(struct Scsi_Host * host)
- * Purpose : returns a descriptive string about this interface,
- * Params : host - driver host structure to return info for.
- * Returns : pointer to a static buffer containing null terminated string.
- */
- const char *powertecscsi_info(struct Scsi_Host *host)
- {
- PowerTecScsi_Info *info = (PowerTecScsi_Info *)host->hostdata;
- static char string[100], *p;
- p = string;
- p += sprintf(p, "%s ", host->hostt->name);
- p += fas216_info(&info->info, p);
- p += sprintf(p, "v%d.%d.%d terminators o%s",
- VER_MAJOR, VER_MINOR, VER_PATCH,
- info->control.terms ? "n" : "ff");
- return string;
- }
- /* Prototype: int powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
- * Purpose : Set a driver specific function
- * Params : host - host to setup
- * : buffer - buffer containing string describing operation
- * : length - length of string
- * Returns : -EINVAL, or 0
- */
- static int
- powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
- {
- int ret = length;
- if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) {
- buffer += 12;
- length -= 12;
- if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
- if (buffer[5] == '1')
- powertecscsi_terminator_ctl(host, 1);
- else if (buffer[5] == '0')
- powertecscsi_terminator_ctl(host, 0);
- else
- ret = -EINVAL;
- } else
- ret = -EINVAL;
- } else
- ret = -EINVAL;
- return ret;
- }
- /* Prototype: int powertecscsi_proc_info(char *buffer, char **start, off_t offset,
- * int length, int host_no, int inout)
- * Purpose : Return information about the driver to a user process accessing
- * the /proc filesystem.
- * Params : buffer - a buffer to write information to
- * start - a pointer into this buffer set by this routine to the start
- * of the required information.
- * offset - offset into information that we have read upto.
- * length - length of buffer
- * host_no - host number to return information for
- * inout - 0 for reading, 1 for writing.
- * Returns : length of data written to buffer.
- */
- int powertecscsi_proc_info(char *buffer, char **start, off_t offset,
- int length, int host_no, int inout)
- {
- int pos, begin;
- struct Scsi_Host *host = scsi_hostlist;
- PowerTecScsi_Info *info;
- Scsi_Device *scd;
- while (host) {
- if (host->host_no == host_no)
- break;
- host = host->next;
- }
- if (!host)
- return 0;
- if (inout == 1)
- return powertecscsi_set_proc_info(host, buffer, length);
- info = (PowerTecScsi_Info *)host->hostdata;
- begin = 0;
- pos = sprintf(buffer,
- "PowerTec SCSI driver version %d.%d.%dn",
- VER_MAJOR, VER_MINOR, VER_PATCH);
- pos += fas216_print_host(&info->info, buffer + pos);
- pos += sprintf(buffer + pos, "Term : o%sn",
- info->control.terms ? "n" : "ff");
- pos += fas216_print_stats(&info->info, buffer + pos);
- pos += sprintf(buffer+pos, "nAttached devices:n");
- for (scd = host->host_queue; scd; scd = scd->next) {
- pos += fas216_print_device(&info->info, scd, buffer + pos);
- if (pos + begin < offset) {
- begin += pos;
- pos = 0;
- }
- if (pos + begin > offset + length)
- break;
- }
- *start = buffer + (offset - begin);
- pos -= offset - begin;
- if (pos > length)
- pos = length;
- return pos;
- }
- static Scsi_Host_Template powertecscsi_template = {
- module: THIS_MODULE,
- proc_info: powertecscsi_proc_info,
- name: "PowerTec SCSI",
- detect: powertecscsi_detect,
- release: powertecscsi_release,
- info: powertecscsi_info,
- bios_param: scsicam_bios_param,
- can_queue: 1,
- this_id: 7,
- sg_tablesize: SG_ALL,
- cmd_per_lun: 1,
- use_clustering: ENABLE_CLUSTERING,
- command: fas216_command,
- queuecommand: fas216_queue_command,
- eh_host_reset_handler: fas216_eh_host_reset,
- eh_bus_reset_handler: fas216_eh_bus_reset,
- eh_device_reset_handler: fas216_eh_device_reset,
- eh_abort_handler: fas216_eh_abort,
- use_new_eh_code: 1
- };
- static int __init powertecscsi_init(void)
- {
- scsi_register_module(MODULE_SCSI_HA, &powertecscsi_template);
- if (powertecscsi_template.present)
- return 0;
- scsi_unregister_module(MODULE_SCSI_HA, &powertecscsi_template);
- return -ENODEV;
- }
- static void __exit powertecscsi_exit(void)
- {
- scsi_unregister_module(MODULE_SCSI_HA, &powertecscsi_template);
- }
- module_init(powertecscsi_init);
- module_exit(powertecscsi_exit);
- MODULE_AUTHOR("Russell King");
- MODULE_DESCRIPTION("Powertec SCSI driver");
- MODULE_PARM(term, "1-8i");
- MODULE_PARM_DESC(term, "SCSI bus termination");
- MODULE_LICENSE("GPL");
- EXPORT_NO_SYMBOLS;