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// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/drivers/acorn/scsi/eesox.c
*
* Copyright (C) 1997-2005 Russell King
*
* This driver is based on experimentation. Hence, it may have made
* assumptions about the particular card that I have available, and
* may not be reliable!
*
* Changelog:
* 01-10-1997 RMK Created, READONLY version
* 15-02-1998 RMK READ/WRITE version
* added DMA support and hardware definitions
* 14-03-1998 RMK Updated DMA support
* Added terminator control
* 15-04-1998 RMK Only do PIO if FAS216 will allow it.
* 27-06-1998 RMK Changed asm/delay.h to linux/delay.h
* 02-04-2000 RMK 0.0.3 Fixed NO_IRQ/NO_DMA problem, updated for new
* error handling code.
*/
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/proc_fs.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
#include <linux/pgtable.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/ecard.h>
#include "../scsi.h"
#include <scsi/scsi_host.h>
#include "fas216.h"
#include "scsi.h"
#include <scsi/scsicam.h>
#define EESOX_FAS216_OFFSET 0x3000
#define EESOX_FAS216_SHIFT 5
#define EESOX_DMASTAT 0x2800
#define EESOX_STAT_INTR 0x01
#define EESOX_STAT_DMA 0x02
#define EESOX_CONTROL 0x2800
#define EESOX_INTR_ENABLE 0x04
#define EESOX_TERM_ENABLE 0x02
#define EESOX_RESET 0x01
#define EESOX_DMADATA 0x3800
#define VERSION "1.10 (17/01/2003 2.5.59)"
/*
* Use term=0,1,0,0,0 to turn terminators on/off
*/
static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
#define NR_SG 256
struct eesoxscsi_info {
FAS216_Info info;
struct expansion_card *ec;
void __iomem *base;
void __iomem *ctl_port;
unsigned int control;
struct scatterlist sg[NR_SG]; /* Scatter DMA list */
};
/* Prototype: void eesoxscsi_irqenable(ec, irqnr)
* Purpose : Enable interrupts on EESOX SCSI card
* Params : ec - expansion card structure
* : irqnr - interrupt number
*/
static void
eesoxscsi_irqenable(struct expansion_card *ec, int irqnr)
{
struct eesoxscsi_info *info = (struct eesoxscsi_info *)ec->irq_data;
info->control |= EESOX_INTR_ENABLE;
writeb(info->control, info->ctl_port);
}
/* Prototype: void eesoxscsi_irqdisable(ec, irqnr)
* Purpose : Disable interrupts on EESOX SCSI card
* Params : ec - expansion card structure
* : irqnr - interrupt number
*/
static void
eesoxscsi_irqdisable(struct expansion_card *ec, int irqnr)
{
struct eesoxscsi_info *info = (struct eesoxscsi_info *)ec->irq_data;
info->control &= ~EESOX_INTR_ENABLE;
writeb(info->control, info->ctl_port);
}
static const expansioncard_ops_t eesoxscsi_ops = {
.irqenable = eesoxscsi_irqenable,
.irqdisable = eesoxscsi_irqdisable,
};
/* Prototype: void eesoxscsi_terminator_ctl(*host, on_off)
* Purpose : Turn the EESOX SCSI terminators on or off
* Params : host - card to turn on/off
* : on_off - !0 to turn on, 0 to turn off
*/
static void
eesoxscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
{
struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
unsigned long flags;
spin_lock_irqsave(host->host_lock, flags);
if (on_off)
info->control |= EESOX_TERM_ENABLE;
else
info->control &= ~EESOX_TERM_ENABLE;
writeb(info->control, info->ctl_port);
spin_unlock_irqrestore(host->host_lock, flags);
}
/* Prototype: void eesoxscsi_intr(irq, *dev_id, *regs)
* Purpose : handle interrupts from EESOX SCSI card
* Params : irq - interrupt number
* dev_id - user-defined (Scsi_Host structure)
*/
static irqreturn_t
eesoxscsi_intr(int irq, void *dev_id)
{
struct eesoxscsi_info *info = dev_id;
return fas216_intr(&info->info);
}
/* Prototype: fasdmatype_t eesoxscsi_dma_setup(host, SCpnt, direction, min_type)
* Purpose : initialises DMA/PIO
* Params : host - host
* SCpnt - command
* direction - DMA on to/off of card
* min_type - minimum DMA support that we must have for this transfer
* Returns : type of transfer to be performed
*/
static fasdmatype_t
eesoxscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
fasdmadir_t direction, fasdmatype_t min_type)
{
struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
struct device *dev = scsi_get_device(host);
int dmach = info->info.scsi.dma;
if (dmach != NO_DMA &&
(min_type == fasdma_real_all || SCp->this_residual >= 512)) {
int bufs, map_dir, dma_dir;
bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
if (direction == DMA_OUT) {
map_dir = DMA_TO_DEVICE;
dma_dir = DMA_MODE_WRITE;
} else {
map_dir = DMA_FROM_DEVICE;
dma_dir = DMA_MODE_READ;
}
dma_map_sg(dev, info->sg, bufs, map_dir);
disable_dma(dmach);
set_dma_sg(dmach, info->sg, bufs);
set_dma_mode(dmach, dma_dir);
enable_dma(dmach);
return fasdma_real_all;
}
/*
* We don't do DMA, we only do slow PIO
*
* Some day, we will do Pseudo DMA
*/
return fasdma_pseudo;
}
static void eesoxscsi_buffer_in(void *buf, int length, void __iomem *base)
{
const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET;
const void __iomem *reg_dmastat = base + EESOX_DMASTAT;
const void __iomem *reg_dmadata = base + EESOX_DMADATA;
register const unsigned long mask = 0xffff;
do {
unsigned int status;
/*
* Interrupt request?
*/
status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT));
if (status & STAT_INT)
break;
/*
* DMA request active?
*/
status = readb(reg_dmastat);
if (!(status & EESOX_STAT_DMA))
continue;
/*
* Get number of bytes in FIFO
*/
status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF;
if (status > 16)
status = 16;
if (status > length)
status = length;
/*
* Align buffer.
*/
if (((u32)buf) & 2 && status >= 2) {
*(u16 *)buf = readl(reg_dmadata);
buf += 2;
status -= 2;
length -= 2;
}
if (status >= 8) {
unsigned long l1, l2;
l1 = readl(reg_dmadata) & mask;
l1 |= readl(reg_dmadata) << 16;
l2 = readl(reg_dmadata) & mask;
l2 |= readl(reg_dmadata) << 16;
*(u32 *)buf = l1;
buf += 4;
*(u32 *)buf = l2;
buf += 4;
length -= 8;
continue;
}
if (status >= 4) {
unsigned long l1;
l1 = readl(reg_dmadata) & mask;
l1 |= readl(
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