641 lines
16 KiB
C
641 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/drivers/acorn/scsi/eesox.c
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*
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* Copyright (C) 1997-2005 Russell King
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*
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* This driver is based on experimentation. Hence, it may have made
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* assumptions about the particular card that I have available, and
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* may not be reliable!
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*
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* Changelog:
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* 01-10-1997 RMK Created, READONLY version
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* 15-02-1998 RMK READ/WRITE version
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* added DMA support and hardware definitions
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* 14-03-1998 RMK Updated DMA support
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* Added terminator control
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* 15-04-1998 RMK Only do PIO if FAS216 will allow it.
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* 27-06-1998 RMK Changed asm/delay.h to linux/delay.h
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* 02-04-2000 RMK 0.0.3 Fixed NO_IRQ/NO_DMA problem, updated for new
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* error handling code.
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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/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/io.h>
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#include <asm/dma.h>
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#include <asm/ecard.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 EESOX_FAS216_OFFSET 0x3000
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#define EESOX_FAS216_SHIFT 5
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#define EESOX_DMASTAT 0x2800
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#define EESOX_STAT_INTR 0x01
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#define EESOX_STAT_DMA 0x02
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#define EESOX_CONTROL 0x2800
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#define EESOX_INTR_ENABLE 0x04
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#define EESOX_TERM_ENABLE 0x02
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#define EESOX_RESET 0x01
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#define EESOX_DMADATA 0x3800
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#define VERSION "1.10 (17/01/2003 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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*/
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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 eesoxscsi_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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void __iomem *ctl_port;
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unsigned int control;
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struct scatterlist sg[NR_SG]; /* Scatter DMA list */
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};
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/* Prototype: void eesoxscsi_irqenable(ec, irqnr)
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* Purpose : Enable interrupts on EESOX 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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eesoxscsi_irqenable(struct expansion_card *ec, int irqnr)
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{
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struct eesoxscsi_info *info = (struct eesoxscsi_info *)ec->irq_data;
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info->control |= EESOX_INTR_ENABLE;
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writeb(info->control, info->ctl_port);
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}
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/* Prototype: void eesoxscsi_irqdisable(ec, irqnr)
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* Purpose : Disable interrupts on EESOX 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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eesoxscsi_irqdisable(struct expansion_card *ec, int irqnr)
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{
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struct eesoxscsi_info *info = (struct eesoxscsi_info *)ec->irq_data;
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info->control &= ~EESOX_INTR_ENABLE;
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writeb(info->control, info->ctl_port);
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}
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static const expansioncard_ops_t eesoxscsi_ops = {
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.irqenable = eesoxscsi_irqenable,
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.irqdisable = eesoxscsi_irqdisable,
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};
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/* Prototype: void eesoxscsi_terminator_ctl(*host, on_off)
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* Purpose : Turn the EESOX 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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eesoxscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
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{
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struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
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unsigned long flags;
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spin_lock_irqsave(host->host_lock, flags);
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if (on_off)
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info->control |= EESOX_TERM_ENABLE;
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else
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info->control &= ~EESOX_TERM_ENABLE;
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writeb(info->control, info->ctl_port);
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spin_unlock_irqrestore(host->host_lock, flags);
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}
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/* Prototype: void eesoxscsi_intr(irq, *dev_id, *regs)
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* Purpose : handle interrupts from EESOX 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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*/
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static irqreturn_t
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eesoxscsi_intr(int irq, void *dev_id)
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{
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struct eesoxscsi_info *info = dev_id;
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return fas216_intr(&info->info);
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}
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/* Prototype: fasdmatype_t eesoxscsi_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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eesoxscsi_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 eesoxscsi_info *info = (struct eesoxscsi_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 (dmach != NO_DMA &&
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(min_type == fasdma_real_all || SCp->this_residual >= 512)) {
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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, map_dir);
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disable_dma(dmach);
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set_dma_sg(dmach, info->sg, bufs);
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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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* We don't do DMA, we only do slow PIO
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*
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* Some day, we will do Pseudo DMA
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*/
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return fasdma_pseudo;
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}
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static void eesoxscsi_buffer_in(void *buf, int length, void __iomem *base)
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{
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const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET;
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const void __iomem *reg_dmastat = base + EESOX_DMASTAT;
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const void __iomem *reg_dmadata = base + EESOX_DMADATA;
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register const unsigned long mask = 0xffff;
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do {
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unsigned int status;
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/*
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* Interrupt request?
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*/
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status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT));
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if (status & STAT_INT)
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break;
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/*
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* DMA request active?
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*/
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status = readb(reg_dmastat);
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if (!(status & EESOX_STAT_DMA))
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continue;
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/*
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* Get number of bytes in FIFO
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*/
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status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF;
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if (status > 16)
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status = 16;
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if (status > length)
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status = length;
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/*
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* Align buffer.
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*/
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if (((u32)buf) & 2 && status >= 2) {
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*(u16 *)buf = readl(reg_dmadata);
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buf += 2;
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status -= 2;
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length -= 2;
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}
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if (status >= 8) {
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unsigned long l1, l2;
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l1 = readl(reg_dmadata) & mask;
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l1 |= readl(reg_dmadata) << 16;
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l2 = readl(reg_dmadata) & mask;
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l2 |= readl(reg_dmadata) << 16;
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*(u32 *)buf = l1;
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buf += 4;
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*(u32 *)buf = l2;
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buf += 4;
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length -= 8;
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continue;
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}
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if (status >= 4) {
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unsigned long l1;
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l1 = readl(reg_dmadata) & mask;
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l1 |= readl(reg_dmadata) << 16;
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*(u32 *)buf = l1;
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buf += 4;
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length -= 4;
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continue;
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}
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if (status >= 2) {
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*(u16 *)buf = readl(reg_dmadata);
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buf += 2;
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length -= 2;
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}
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} while (length);
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}
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static void eesoxscsi_buffer_out(void *buf, int length, void __iomem *base)
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{
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const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET;
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const void __iomem *reg_dmastat = base + EESOX_DMASTAT;
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void __iomem *reg_dmadata = base + EESOX_DMADATA;
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do {
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unsigned int status;
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/*
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* Interrupt request?
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*/
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status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT));
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if (status & STAT_INT)
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break;
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/*
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* DMA request active?
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*/
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status = readb(reg_dmastat);
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if (!(status & EESOX_STAT_DMA))
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continue;
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/*
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* Get number of bytes in FIFO
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*/
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status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF;
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if (status > 16)
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status = 16;
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status = 16 - status;
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if (status > length)
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status = length;
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status &= ~1;
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/*
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* Align buffer.
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*/
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if (((u32)buf) & 2 && status >= 2) {
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writel(*(u16 *)buf << 16, reg_dmadata);
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buf += 2;
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status -= 2;
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length -= 2;
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}
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if (status >= 8) {
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unsigned long l1, l2;
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l1 = *(u32 *)buf;
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buf += 4;
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l2 = *(u32 *)buf;
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buf += 4;
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writel(l1 << 16, reg_dmadata);
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writel(l1, reg_dmadata);
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writel(l2 << 16, reg_dmadata);
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writel(l2, reg_dmadata);
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length -= 8;
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continue;
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}
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if (status >= 4) {
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unsigned long l1;
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l1 = *(u32 *)buf;
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buf += 4;
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writel(l1 << 16, reg_dmadata);
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writel(l1, reg_dmadata);
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length -= 4;
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continue;
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}
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if (status >= 2) {
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writel(*(u16 *)buf << 16, reg_dmadata);
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buf += 2;
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length -= 2;
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}
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} while (length);
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}
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static void
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eesoxscsi_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
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fasdmadir_t dir, int transfer_size)
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{
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struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
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if (dir == DMA_IN) {
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eesoxscsi_buffer_in(SCp->ptr, SCp->this_residual, info->base);
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} else {
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eesoxscsi_buffer_out(SCp->ptr, SCp->this_residual, info->base);
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}
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}
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/* Prototype: int eesoxscsi_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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eesoxscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
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{
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struct eesoxscsi_info *info = (struct eesoxscsi_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 *eesoxscsi_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 *eesoxscsi_info(struct Scsi_Host *host)
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{
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struct eesoxscsi_info *info = (struct eesoxscsi_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->control & EESOX_TERM_ENABLE ? "n" : "ff");
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return string;
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}
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/* Prototype: int eesoxscsi_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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eesoxscsi_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 >= 9 && strncmp(buffer, "EESOXSCSI", 9) == 0) {
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buffer += 9;
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length -= 9;
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if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
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if (buffer[5] == '1')
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eesoxscsi_terminator_ctl(host, 1);
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else if (buffer[5] == '0')
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eesoxscsi_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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static int eesoxscsi_show_info(struct seq_file *m, struct Scsi_Host *host)
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{
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struct eesoxscsi_info *info;
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info = (struct eesoxscsi_info *)host->hostdata;
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seq_printf(m, "EESOX SCSI driver v%s\n", VERSION);
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fas216_print_host(&info->info, m);
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seq_printf(m, "Term : o%s\n",
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info->control & EESOX_TERM_ENABLE ? "n" : "ff");
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fas216_print_stats(&info->info, m);
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fas216_print_devices(&info->info, m);
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return 0;
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}
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static ssize_t eesoxscsi_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 eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
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return sprintf(buf, "%d\n", info->control & EESOX_TERM_ENABLE ? 1 : 0);
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}
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static ssize_t eesoxscsi_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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struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
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unsigned long flags;
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if (len > 1) {
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spin_lock_irqsave(host->host_lock, flags);
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if (buf[0] != '0') {
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info->control |= EESOX_TERM_ENABLE;
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} else {
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info->control &= ~EESOX_TERM_ENABLE;
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}
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writeb(info->control, info->ctl_port);
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spin_unlock_irqrestore(host->host_lock, flags);
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}
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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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eesoxscsi_show_term, eesoxscsi_store_term);
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static struct scsi_host_template eesox_template = {
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.module = THIS_MODULE,
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.show_info = eesoxscsi_show_info,
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.write_info = eesoxscsi_set_proc_info,
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.name = "EESOX SCSI",
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.info = eesoxscsi_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 = 1,
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.this_id = 7,
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.sg_tablesize = SG_MAX_SEGMENTS,
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.dma_boundary = IOMD_DMA_BOUNDARY,
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.proc_name = "eesox",
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};
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static int eesoxscsi_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 eesoxscsi_info *info;
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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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base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
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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(&eesox_template,
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sizeof(struct eesoxscsi_info));
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if (!host) {
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ret = -ENOMEM;
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goto out_region;
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}
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|
ecard_set_drvdata(ec, host);
|
|
|
|
info = (struct eesoxscsi_info *)host->hostdata;
|
|
info->ec = ec;
|
|
info->base = base;
|
|
info->ctl_port = base + EESOX_CONTROL;
|
|
info->control = term[ec->slot_no] ? EESOX_TERM_ENABLE : 0;
|
|
writeb(info->control, info->ctl_port);
|
|
|
|
info->info.scsi.io_base = base + EESOX_FAS216_OFFSET;
|
|
info->info.scsi.io_shift = EESOX_FAS216_SHIFT;
|
|
info->info.scsi.irq = ec->irq;
|
|
info->info.scsi.dma = ec->dma;
|
|
info->info.ifcfg.clockrate = 40; /* MHz */
|
|
info->info.ifcfg.select_timeout = 255;
|
|
info->info.ifcfg.asyncperiod = 200; /* ns */
|
|
info->info.ifcfg.sync_max_depth = 7;
|
|
info->info.ifcfg.cntl3 = CNTL3_FASTSCSI | CNTL3_FASTCLK;
|
|
info->info.ifcfg.disconnect_ok = 1;
|
|
info->info.ifcfg.wide_max_size = 0;
|
|
info->info.ifcfg.capabilities = FASCAP_PSEUDODMA;
|
|
info->info.dma.setup = eesoxscsi_dma_setup;
|
|
info->info.dma.pseudo = eesoxscsi_dma_pseudo;
|
|
info->info.dma.stop = eesoxscsi_dma_stop;
|
|
|
|
ec->irqaddr = base + EESOX_DMASTAT;
|
|
ec->irqmask = EESOX_STAT_INTR;
|
|
|
|
ecard_setirq(ec, &eesoxscsi_ops, info);
|
|
|
|
device_create_file(&ec->dev, &dev_attr_bus_term);
|
|
|
|
ret = fas216_init(host);
|
|
if (ret)
|
|
goto out_free;
|
|
|
|
ret = request_irq(ec->irq, eesoxscsi_intr, 0, "eesoxscsi", info);
|
|
if (ret) {
|
|
printk("scsi%d: IRQ%d not free: %d\n",
|
|
host->host_no, ec->irq, ret);
|
|
goto out_remove;
|
|
}
|
|
|
|
if (info->info.scsi.dma != NO_DMA) {
|
|
if (request_dma(info->info.scsi.dma, "eesox")) {
|
|
printk("scsi%d: DMA%d not free, DMA disabled\n",
|
|
host->host_no, info->info.scsi.dma);
|
|
info->info.scsi.dma = NO_DMA;
|
|
} else {
|
|
set_dma_speed(info->info.scsi.dma, 180);
|
|
info->info.ifcfg.capabilities |= FASCAP_DMA;
|
|
info->info.ifcfg.cntl3 |= CNTL3_BS8;
|
|
}
|
|
}
|
|
|
|
ret = fas216_add(host, &ec->dev);
|
|
if (ret == 0)
|
|
goto out;
|
|
|
|
if (info->info.scsi.dma != NO_DMA)
|
|
free_dma(info->info.scsi.dma);
|
|
free_irq(ec->irq, host);
|
|
|
|
out_remove:
|
|
fas216_remove(host);
|
|
|
|
out_free:
|
|
device_remove_file(&ec->dev, &dev_attr_bus_term);
|
|
scsi_host_put(host);
|
|
|
|
out_region:
|
|
ecard_release_resources(ec);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void eesoxscsi_remove(struct expansion_card *ec)
|
|
{
|
|
struct Scsi_Host *host = ecard_get_drvdata(ec);
|
|
struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
|
|
|
|
ecard_set_drvdata(ec, NULL);
|
|
fas216_remove(host);
|
|
|
|
if (info->info.scsi.dma != NO_DMA)
|
|
free_dma(info->info.scsi.dma);
|
|
free_irq(ec->irq, info);
|
|
|
|
device_remove_file(&ec->dev, &dev_attr_bus_term);
|
|
|
|
fas216_release(host);
|
|
scsi_host_put(host);
|
|
ecard_release_resources(ec);
|
|
}
|
|
|
|
static const struct ecard_id eesoxscsi_cids[] = {
|
|
{ MANU_EESOX, PROD_EESOX_SCSI2 },
|
|
{ 0xffff, 0xffff },
|
|
};
|
|
|
|
static struct ecard_driver eesoxscsi_driver = {
|
|
.probe = eesoxscsi_probe,
|
|
.remove = eesoxscsi_remove,
|
|
.id_table = eesoxscsi_cids,
|
|
.drv = {
|
|
.name = "eesoxscsi",
|
|
},
|
|
};
|
|
|
|
static int __init eesox_init(void)
|
|
{
|
|
return ecard_register_driver(&eesoxscsi_driver);
|
|
}
|
|
|
|
static void __exit eesox_exit(void)
|
|
{
|
|
ecard_remove_driver(&eesoxscsi_driver);
|
|
}
|
|
|
|
module_init(eesox_init);
|
|
module_exit(eesox_exit);
|
|
|
|
MODULE_AUTHOR("Russell King");
|
|
MODULE_DESCRIPTION("EESOX 'Fast' SCSI driver for Acorn machines");
|
|
module_param_array(term, int, NULL, 0);
|
|
MODULE_PARM_DESC(term, "SCSI bus termination");
|
|
MODULE_LICENSE("GPL");
|