c7b87f3d50
Rather than having every driver fiddle about setting its private IRQ operations and data, provide a helper function to contain this functionality in one place. Arrange to remove the driver-private IRQ operations and data when the device is removed from the driver, and remove the driver private code to do this. This fixes potential problems caused by drivers forgetting to remove these hooks. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
554 lines
14 KiB
C
554 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 && strcmp(buffer, "CUMANASCSI2") == 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 = SG_ALL,
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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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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_MEMC);
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reslen = ecard_resource_len(ec, ECARD_RES_MEMC);
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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(&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_unmap;
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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;
|
|
}
|
|
}
|
|
|
|
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_release:
|
|
fas216_release(host);
|
|
|
|
out_free:
|
|
scsi_host_put(host);
|
|
|
|
out_unmap:
|
|
iounmap(base);
|
|
|
|
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);
|
|
|
|
iounmap(info->base);
|
|
|
|
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");
|