472 lines
12 KiB
C
472 lines
12 KiB
C
/*
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* linux/drivers/acorn/scsi/powertec.c
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*
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* Copyright (C) 1997-2005 Russell King
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/blkdev.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/ioport.h>
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#include <linux/sched.h>
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#include <linux/proc_fs.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/dma-mapping.h>
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#include <asm/dma.h>
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#include <asm/ecard.h>
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#include <asm/io.h>
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#include <asm/pgtable.h>
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#include "../scsi.h"
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#include <scsi/scsi_host.h>
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#include "fas216.h"
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#include "scsi.h"
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#include <scsi/scsicam.h>
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#define POWERTEC_FAS216_OFFSET 0x3000
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#define POWERTEC_FAS216_SHIFT 6
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#define POWERTEC_INTR_STATUS 0x2000
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#define POWERTEC_INTR_BIT 0x80
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#define POWERTEC_RESET_CONTROL 0x1018
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#define POWERTEC_RESET_BIT 1
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#define POWERTEC_TERM_CONTROL 0x2018
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#define POWERTEC_TERM_ENABLE 1
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#define POWERTEC_INTR_CONTROL 0x101c
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#define POWERTEC_INTR_ENABLE 1
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#define POWERTEC_INTR_DISABLE 0
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#define VERSION "1.10 (19/01/2003 2.5.59)"
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/*
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* Use term=0,1,0,0,0 to turn terminators on/off.
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* One entry per slot.
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*/
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static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
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#define NR_SG 256
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struct powertec_info {
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FAS216_Info info;
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struct expansion_card *ec;
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void __iomem *base;
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unsigned int term_ctl;
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struct scatterlist sg[NR_SG];
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};
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/* Prototype: void powertecscsi_irqenable(ec, irqnr)
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* Purpose : Enable interrupts on Powertec SCSI card
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* Params : ec - expansion card structure
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* : irqnr - interrupt number
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*/
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static void
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powertecscsi_irqenable(struct expansion_card *ec, int irqnr)
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{
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struct powertec_info *info = ec->irq_data;
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writeb(POWERTEC_INTR_ENABLE, info->base + POWERTEC_INTR_CONTROL);
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}
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/* Prototype: void powertecscsi_irqdisable(ec, irqnr)
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* Purpose : Disable interrupts on Powertec SCSI card
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* Params : ec - expansion card structure
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* : irqnr - interrupt number
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*/
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static void
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powertecscsi_irqdisable(struct expansion_card *ec, int irqnr)
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{
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struct powertec_info *info = ec->irq_data;
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writeb(POWERTEC_INTR_DISABLE, info->base + POWERTEC_INTR_CONTROL);
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}
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static const expansioncard_ops_t powertecscsi_ops = {
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.irqenable = powertecscsi_irqenable,
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.irqdisable = powertecscsi_irqdisable,
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};
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/* Prototype: void powertecscsi_terminator_ctl(host, on_off)
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* Purpose : Turn the Powertec SCSI terminators on or off
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* Params : host - card to turn on/off
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* : on_off - !0 to turn on, 0 to turn off
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*/
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static void
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powertecscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
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{
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struct powertec_info *info = (struct powertec_info *)host->hostdata;
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info->term_ctl = on_off ? POWERTEC_TERM_ENABLE : 0;
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writeb(info->term_ctl, info->base + POWERTEC_TERM_CONTROL);
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}
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/* Prototype: void powertecscsi_intr(irq, *dev_id, *regs)
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* Purpose : handle interrupts from Powertec SCSI card
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* Params : irq - interrupt number
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* dev_id - user-defined (Scsi_Host structure)
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* regs - processor registers at interrupt
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*/
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static irqreturn_t
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powertecscsi_intr(int irq, void *dev_id, struct pt_regs *regs)
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{
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struct powertec_info *info = dev_id;
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return fas216_intr(&info->info);
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}
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/* Prototype: fasdmatype_t powertecscsi_dma_setup(host, SCpnt, direction, min_type)
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* Purpose : initialises DMA/PIO
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* Params : host - host
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* SCpnt - command
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* direction - DMA on to/off of card
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* min_type - minimum DMA support that we must have for this transfer
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* Returns : type of transfer to be performed
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*/
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static fasdmatype_t
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powertecscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
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fasdmadir_t direction, fasdmatype_t min_type)
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{
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struct powertec_info *info = (struct powertec_info *)host->hostdata;
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struct device *dev = scsi_get_device(host);
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int dmach = info->info.scsi.dma;
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if (info->info.ifcfg.capabilities & FASCAP_DMA &&
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min_type == fasdma_real_all) {
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int bufs, map_dir, dma_dir;
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bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
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if (direction == DMA_OUT)
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map_dir = DMA_TO_DEVICE,
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dma_dir = DMA_MODE_WRITE;
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else
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map_dir = DMA_FROM_DEVICE,
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dma_dir = DMA_MODE_READ;
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dma_map_sg(dev, info->sg, bufs + 1, map_dir);
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disable_dma(dmach);
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set_dma_sg(dmach, info->sg, bufs + 1);
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set_dma_mode(dmach, dma_dir);
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enable_dma(dmach);
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return fasdma_real_all;
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}
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/*
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* If we're not doing DMA,
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* we'll do slow PIO
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*/
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return fasdma_pio;
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}
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/* Prototype: int powertecscsi_dma_stop(host, SCpnt)
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* Purpose : stops DMA/PIO
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* Params : host - host
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* SCpnt - command
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*/
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static void
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powertecscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
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{
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struct powertec_info *info = (struct powertec_info *)host->hostdata;
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if (info->info.scsi.dma != NO_DMA)
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disable_dma(info->info.scsi.dma);
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}
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/* Prototype: const char *powertecscsi_info(struct Scsi_Host * host)
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* Purpose : returns a descriptive string about this interface,
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* Params : host - driver host structure to return info for.
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* Returns : pointer to a static buffer containing null terminated string.
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*/
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const char *powertecscsi_info(struct Scsi_Host *host)
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{
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struct powertec_info *info = (struct powertec_info *)host->hostdata;
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static char string[150];
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sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
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host->hostt->name, info->info.scsi.type, info->ec->slot_no,
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VERSION, info->term_ctl ? "n" : "ff");
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return string;
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}
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/* Prototype: int powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
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* Purpose : Set a driver specific function
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* Params : host - host to setup
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* : buffer - buffer containing string describing operation
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* : length - length of string
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* Returns : -EINVAL, or 0
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*/
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static int
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powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
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{
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int ret = length;
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if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) {
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buffer += 12;
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length -= 12;
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if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
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if (buffer[5] == '1')
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powertecscsi_terminator_ctl(host, 1);
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else if (buffer[5] == '0')
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powertecscsi_terminator_ctl(host, 0);
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else
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ret = -EINVAL;
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} else
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ret = -EINVAL;
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} else
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ret = -EINVAL;
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return ret;
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}
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/* Prototype: int powertecscsi_proc_info(char *buffer, char **start, off_t offset,
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* int length, int host_no, int inout)
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* Purpose : Return information about the driver to a user process accessing
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* the /proc filesystem.
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* Params : buffer - a buffer to write information to
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* start - a pointer into this buffer set by this routine to the start
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* of the required information.
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* offset - offset into information that we have read upto.
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* length - length of buffer
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* inout - 0 for reading, 1 for writing.
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* Returns : length of data written to buffer.
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*/
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int powertecscsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset,
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int length, int inout)
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{
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struct powertec_info *info;
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char *p = buffer;
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int pos;
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if (inout == 1)
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return powertecscsi_set_proc_info(host, buffer, length);
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info = (struct powertec_info *)host->hostdata;
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p += sprintf(p, "PowerTec SCSI driver v%s\n", VERSION);
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p += fas216_print_host(&info->info, p);
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p += sprintf(p, "Term : o%s\n",
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info->term_ctl ? "n" : "ff");
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p += fas216_print_stats(&info->info, p);
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p += fas216_print_devices(&info->info, p);
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*start = buffer + offset;
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pos = p - buffer - offset;
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if (pos > length)
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pos = length;
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return pos;
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}
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static ssize_t powertecscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct expansion_card *ec = ECARD_DEV(dev);
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struct Scsi_Host *host = ecard_get_drvdata(ec);
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struct powertec_info *info = (struct powertec_info *)host->hostdata;
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return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0);
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}
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static ssize_t
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powertecscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
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{
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struct expansion_card *ec = ECARD_DEV(dev);
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struct Scsi_Host *host = ecard_get_drvdata(ec);
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if (len > 1)
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powertecscsi_terminator_ctl(host, buf[0] != '0');
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return len;
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}
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static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,
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powertecscsi_show_term, powertecscsi_store_term);
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static struct scsi_host_template powertecscsi_template = {
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.module = THIS_MODULE,
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.proc_info = powertecscsi_proc_info,
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.name = "PowerTec SCSI",
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.info = powertecscsi_info,
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.queuecommand = fas216_queue_command,
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.eh_host_reset_handler = fas216_eh_host_reset,
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.eh_bus_reset_handler = fas216_eh_bus_reset,
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.eh_device_reset_handler = fas216_eh_device_reset,
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.eh_abort_handler = fas216_eh_abort,
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.can_queue = 8,
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.this_id = 7,
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.sg_tablesize = SG_ALL,
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.cmd_per_lun = 2,
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.use_clustering = ENABLE_CLUSTERING,
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.proc_name = "powertec",
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};
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static int __devinit
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powertecscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
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{
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struct Scsi_Host *host;
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struct powertec_info *info;
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unsigned long resbase, reslen;
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void __iomem *base;
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int ret;
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ret = ecard_request_resources(ec);
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if (ret)
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goto out;
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resbase = ecard_resource_start(ec, ECARD_RES_IOCFAST);
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reslen = ecard_resource_len(ec, ECARD_RES_IOCFAST);
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base = ioremap(resbase, reslen);
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if (!base) {
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ret = -ENOMEM;
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goto out_region;
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}
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host = scsi_host_alloc(&powertecscsi_template,
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sizeof (struct powertec_info));
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if (!host) {
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ret = -ENOMEM;
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goto out_unmap;
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}
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ecard_set_drvdata(ec, host);
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info = (struct powertec_info *)host->hostdata;
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info->base = base;
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powertecscsi_terminator_ctl(host, term[ec->slot_no]);
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info->info.scsi.io_base = base + POWERTEC_FAS216_OFFSET;
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info->info.scsi.io_shift = POWERTEC_FAS216_SHIFT;
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info->info.scsi.irq = ec->irq;
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info->info.scsi.dma = ec->dma;
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info->info.ifcfg.clockrate = 40; /* MHz */
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info->info.ifcfg.select_timeout = 255;
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info->info.ifcfg.asyncperiod = 200; /* ns */
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info->info.ifcfg.sync_max_depth = 7;
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info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
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info->info.ifcfg.disconnect_ok = 1;
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info->info.ifcfg.wide_max_size = 0;
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info->info.ifcfg.capabilities = 0;
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info->info.dma.setup = powertecscsi_dma_setup;
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info->info.dma.pseudo = NULL;
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info->info.dma.stop = powertecscsi_dma_stop;
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ec->irqaddr = base + POWERTEC_INTR_STATUS;
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ec->irqmask = POWERTEC_INTR_BIT;
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ec->irq_data = info;
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ec->ops = &powertecscsi_ops;
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device_create_file(&ec->dev, &dev_attr_bus_term);
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ret = fas216_init(host);
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if (ret)
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goto out_free;
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ret = request_irq(ec->irq, powertecscsi_intr,
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IRQF_DISABLED, "powertec", info);
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if (ret) {
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printk("scsi%d: IRQ%d not free: %d\n",
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host->host_no, ec->irq, ret);
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goto out_release;
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}
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if (info->info.scsi.dma != NO_DMA) {
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if (request_dma(info->info.scsi.dma, "powertec")) {
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printk("scsi%d: DMA%d not free, using PIO\n",
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host->host_no, info->info.scsi.dma);
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info->info.scsi.dma = NO_DMA;
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} else {
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set_dma_speed(info->info.scsi.dma, 180);
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info->info.ifcfg.capabilities |= FASCAP_DMA;
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}
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}
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ret = fas216_add(host, &ec->dev);
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if (ret == 0)
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goto out;
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if (info->info.scsi.dma != NO_DMA)
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free_dma(info->info.scsi.dma);
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free_irq(ec->irq, host);
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out_release:
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fas216_release(host);
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out_free:
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device_remove_file(&ec->dev, &dev_attr_bus_term);
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scsi_host_put(host);
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out_unmap:
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iounmap(base);
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out_region:
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ecard_release_resources(ec);
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out:
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return ret;
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}
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static void __devexit powertecscsi_remove(struct expansion_card *ec)
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{
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struct Scsi_Host *host = ecard_get_drvdata(ec);
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struct powertec_info *info = (struct powertec_info *)host->hostdata;
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ecard_set_drvdata(ec, NULL);
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fas216_remove(host);
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device_remove_file(&ec->dev, &dev_attr_bus_term);
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if (info->info.scsi.dma != NO_DMA)
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free_dma(info->info.scsi.dma);
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free_irq(ec->irq, info);
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iounmap(info->base);
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fas216_release(host);
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scsi_host_put(host);
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ecard_release_resources(ec);
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}
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static const struct ecard_id powertecscsi_cids[] = {
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{ MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI },
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{ 0xffff, 0xffff },
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};
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static struct ecard_driver powertecscsi_driver = {
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.probe = powertecscsi_probe,
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.remove = __devexit_p(powertecscsi_remove),
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.id_table = powertecscsi_cids,
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.drv = {
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.name = "powertecscsi",
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},
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};
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static int __init powertecscsi_init(void)
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{
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return ecard_register_driver(&powertecscsi_driver);
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}
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static void __exit powertecscsi_exit(void)
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{
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ecard_remove_driver(&powertecscsi_driver);
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}
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module_init(powertecscsi_init);
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module_exit(powertecscsi_exit);
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MODULE_AUTHOR("Russell King");
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MODULE_DESCRIPTION("Powertec SCSI driver");
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module_param_array(term, int, NULL, 0);
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MODULE_PARM_DESC(term, "SCSI bus termination");
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MODULE_LICENSE("GPL");
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