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546 lines
14 KiB
C
546 lines
14 KiB
C
/*
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* linux/drivers/acorn/scsi/cumana_2.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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* Changelog:
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* 30-08-1997 RMK 0.0.0 Created, READONLY version.
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* 22-01-1998 RMK 0.0.1 Updated to 2.1.80.
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* 15-04-1998 RMK 0.0.1 Only do PIO if FAS216 will allow it.
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* 02-05-1998 RMK 0.0.2 Updated & added DMA support.
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* 27-06-1998 RMK Changed asm/delay.h to linux/delay.h
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* 18-08-1998 RMK 0.0.3 Fixed synchronous transfer depth.
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* 02-04-2000 RMK 0.0.4 Updated for new 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/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 CUMANASCSI2_STATUS (0x0000)
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#define STATUS_INT (1 << 0)
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#define STATUS_DRQ (1 << 1)
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#define STATUS_LATCHED (1 << 3)
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#define CUMANASCSI2_ALATCH (0x0014)
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#define ALATCH_ENA_INT (3)
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#define ALATCH_DIS_INT (2)
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#define ALATCH_ENA_TERM (5)
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#define ALATCH_DIS_TERM (4)
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#define ALATCH_ENA_BIT32 (11)
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#define ALATCH_DIS_BIT32 (10)
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#define ALATCH_ENA_DMA (13)
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#define ALATCH_DIS_DMA (12)
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#define ALATCH_DMA_OUT (15)
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#define ALATCH_DMA_IN (14)
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#define CUMANASCSI2_PSEUDODMA (0x0200)
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#define CUMANASCSI2_FAS216_OFFSET (0x0300)
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#define CUMANASCSI2_FAS216_SHIFT 2
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/*
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* Version
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*/
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#define VERSION "1.00 (13/11/2002 2.5.47)"
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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 cumanascsi2_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 terms; /* Terminator state */
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struct scatterlist sg[NR_SG]; /* Scatter DMA list */
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};
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#define CSTATUS_IRQ (1 << 0)
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#define CSTATUS_DRQ (1 << 1)
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/* Prototype: void cumanascsi_2_irqenable(ec, irqnr)
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* Purpose : Enable interrupts on Cumana SCSI 2 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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cumanascsi_2_irqenable(struct expansion_card *ec, int irqnr)
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{
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struct cumanascsi2_info *info = ec->irq_data;
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writeb(ALATCH_ENA_INT, info->base + CUMANASCSI2_ALATCH);
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}
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/* Prototype: void cumanascsi_2_irqdisable(ec, irqnr)
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* Purpose : Disable interrupts on Cumana SCSI 2 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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cumanascsi_2_irqdisable(struct expansion_card *ec, int irqnr)
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{
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struct cumanascsi2_info *info = ec->irq_data;
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writeb(ALATCH_DIS_INT, info->base + CUMANASCSI2_ALATCH);
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}
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static const expansioncard_ops_t cumanascsi_2_ops = {
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.irqenable = cumanascsi_2_irqenable,
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.irqdisable = cumanascsi_2_irqdisable,
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};
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/* Prototype: void cumanascsi_2_terminator_ctl(host, on_off)
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* Purpose : Turn the Cumana SCSI 2 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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cumanascsi_2_terminator_ctl(struct Scsi_Host *host, int on_off)
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{
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struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
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if (on_off) {
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info->terms = 1;
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writeb(ALATCH_ENA_TERM, info->base + CUMANASCSI2_ALATCH);
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} else {
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info->terms = 0;
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writeb(ALATCH_DIS_TERM, info->base + CUMANASCSI2_ALATCH);
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}
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}
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/* Prototype: void cumanascsi_2_intr(irq, *dev_id, *regs)
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* Purpose : handle interrupts from Cumana SCSI 2 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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cumanascsi_2_intr(int irq, void *dev_id)
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{
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struct cumanascsi2_info *info = dev_id;
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return fas216_intr(&info->info);
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}
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/* Prototype: fasdmatype_t cumanascsi_2_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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cumanascsi_2_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 cumanascsi2_info *info = (struct cumanascsi2_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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writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);
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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, alatch_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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alatch_dir = ALATCH_DMA_OUT;
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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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alatch_dir = ALATCH_DMA_IN;
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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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writeb(alatch_dir, info->base + CUMANASCSI2_ALATCH);
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set_dma_mode(dmach, dma_dir);
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enable_dma(dmach);
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writeb(ALATCH_ENA_DMA, info->base + CUMANASCSI2_ALATCH);
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writeb(ALATCH_DIS_BIT32, info->base + CUMANASCSI2_ALATCH);
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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 pseudo DMA
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*/
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return fasdma_pio;
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}
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/*
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* Prototype: void cumanascsi_2_dma_pseudo(host, SCpnt, direction, transfer)
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* Purpose : handles pseudo DMA
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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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* transfer - minimum number of bytes we expect to transfer
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*/
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static void
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cumanascsi_2_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
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fasdmadir_t direction, int transfer)
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{
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struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
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unsigned int length;
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unsigned char *addr;
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length = SCp->this_residual;
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addr = SCp->ptr;
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if (direction == DMA_OUT)
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#if 0
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while (length > 1) {
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unsigned long word;
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unsigned int status = readb(info->base + CUMANASCSI2_STATUS);
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if (status & STATUS_INT)
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goto end;
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if (!(status & STATUS_DRQ))
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continue;
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word = *addr | *(addr + 1) << 8;
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writew(word, info->base + CUMANASCSI2_PSEUDODMA);
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addr += 2;
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length -= 2;
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}
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#else
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printk ("PSEUDO_OUT???\n");
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#endif
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else {
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if (transfer && (transfer & 255)) {
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while (length >= 256) {
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unsigned int status = readb(info->base + CUMANASCSI2_STATUS);
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if (status & STATUS_INT)
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return;
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if (!(status & STATUS_DRQ))
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continue;
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readsw(info->base + CUMANASCSI2_PSEUDODMA,
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addr, 256 >> 1);
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addr += 256;
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length -= 256;
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}
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}
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while (length > 0) {
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unsigned long word;
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unsigned int status = readb(info->base + CUMANASCSI2_STATUS);
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if (status & STATUS_INT)
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return;
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if (!(status & STATUS_DRQ))
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continue;
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word = readw(info->base + CUMANASCSI2_PSEUDODMA);
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*addr++ = word;
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if (--length > 0) {
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*addr++ = word >> 8;
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length --;
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}
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}
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}
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}
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/* Prototype: int cumanascsi_2_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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cumanascsi_2_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
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{
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struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
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if (info->info.scsi.dma != NO_DMA) {
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writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);
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disable_dma(info->info.scsi.dma);
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}
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}
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/* Prototype: const char *cumanascsi_2_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 *cumanascsi_2_info(struct Scsi_Host *host)
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{
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struct cumanascsi2_info *info = (struct cumanascsi2_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->terms ? "n" : "ff");
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return string;
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}
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/* Prototype: int cumanascsi_2_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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cumanascsi_2_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 >= 11 && strncmp(buffer, "CUMANASCSI2", 11) == 0) {
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buffer += 11;
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length -= 11;
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if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
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if (buffer[5] == '1')
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cumanascsi_2_terminator_ctl(host, 1);
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else if (buffer[5] == '0')
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cumanascsi_2_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 cumanascsi_2_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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* host_no - host number to return information for
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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 cumanascsi_2_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 cumanascsi2_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 cumanascsi_2_set_proc_info(host, buffer, length);
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info = (struct cumanascsi2_info *)host->hostdata;
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p += sprintf(p, "Cumana SCSI II 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->terms ? "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 struct scsi_host_template cumanascsi2_template = {
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.module = THIS_MODULE,
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.proc_info = cumanascsi_2_proc_info,
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.name = "Cumana SCSI II",
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.info = cumanascsi_2_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 = SCSI_MAX_SG_CHAIN_SEGMENTS,
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.dma_boundary = IOMD_DMA_BOUNDARY,
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.cmd_per_lun = 1,
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.use_clustering = DISABLE_CLUSTERING,
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.proc_name = "cumanascsi2",
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};
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static int __devinit
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cumanascsi2_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 cumanascsi2_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_MEMC, 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(&cumanascsi2_template,
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sizeof(struct cumanascsi2_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);
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info = (struct cumanascsi2_info *)host->hostdata;
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info->ec = ec;
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info->base = base;
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cumanascsi_2_terminator_ctl(host, term[ec->slot_no]);
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info->info.scsi.io_base = base + CUMANASCSI2_FAS216_OFFSET;
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info->info.scsi.io_shift = CUMANASCSI2_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 = FASCAP_PSEUDODMA;
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info->info.dma.setup = cumanascsi_2_dma_setup;
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info->info.dma.pseudo = cumanascsi_2_dma_pseudo;
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info->info.dma.stop = cumanascsi_2_dma_stop;
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ec->irqaddr = info->base + CUMANASCSI2_STATUS;
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ec->irqmask = STATUS_INT;
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ecard_setirq(ec, &cumanascsi_2_ops, info);
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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, cumanascsi_2_intr,
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IRQF_DISABLED, "cumanascsi2", 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, "cumanascsi2")) {
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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)
|
|
free_dma(info->info.scsi.dma);
|
|
free_irq(ec->irq, host);
|
|
|
|
out_release:
|
|
fas216_release(host);
|
|
|
|
out_free:
|
|
scsi_host_put(host);
|
|
|
|
out_region:
|
|
ecard_release_resources(ec);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void __devexit cumanascsi2_remove(struct expansion_card *ec)
|
|
{
|
|
struct Scsi_Host *host = ecard_get_drvdata(ec);
|
|
struct cumanascsi2_info *info = (struct cumanascsi2_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);
|
|
|
|
fas216_release(host);
|
|
scsi_host_put(host);
|
|
ecard_release_resources(ec);
|
|
}
|
|
|
|
static const struct ecard_id cumanascsi2_cids[] = {
|
|
{ MANU_CUMANA, PROD_CUMANA_SCSI_2 },
|
|
{ 0xffff, 0xffff },
|
|
};
|
|
|
|
static struct ecard_driver cumanascsi2_driver = {
|
|
.probe = cumanascsi2_probe,
|
|
.remove = __devexit_p(cumanascsi2_remove),
|
|
.id_table = cumanascsi2_cids,
|
|
.drv = {
|
|
.name = "cumanascsi2",
|
|
},
|
|
};
|
|
|
|
static int __init cumanascsi2_init(void)
|
|
{
|
|
return ecard_register_driver(&cumanascsi2_driver);
|
|
}
|
|
|
|
static void __exit cumanascsi2_exit(void)
|
|
{
|
|
ecard_remove_driver(&cumanascsi2_driver);
|
|
}
|
|
|
|
module_init(cumanascsi2_init);
|
|
module_exit(cumanascsi2_exit);
|
|
|
|
MODULE_AUTHOR("Russell King");
|
|
MODULE_DESCRIPTION("Cumana SCSI-2 driver for Acorn machines");
|
|
module_param_array(term, int, NULL, 0);
|
|
MODULE_PARM_DESC(term, "SCSI bus termination");
|
|
MODULE_LICENSE("GPL");
|