/*
* Copyright (C) 1997-1998 Mark Lord <mlord@pobox.com>
* Copyright (C) 1998 Eddie C. Dost <ecd@skynet.be>
* Copyright (C) 1999-2000 Andre Hedrick <andre@linux-ide.org>
* Copyright (C) 2004 Grant Grundler <grundler at parisc-linux.org>
*
* Inspired by an earlier effort from David S. Miller <davem@redhat.com>
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/hdreg.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/ide.h>
#include <linux/init.h>
#include <asm/io.h>
#ifdef CONFIG_SUPERIO
/* SUPERIO 87560 is a PoS chip that NatSem denies exists.
* Unfortunately, it's built-in on all Astro-based PA-RISC workstations
* which use the integrated NS87514 cell for CD-ROM support.
* i.e we have to support for CD-ROM installs.
* See drivers/parisc/superio.c for more gory details.
*/
#include <asm/superio.h>
static unsigned long superio_ide_status[2];
static unsigned long superio_ide_select[2];
static unsigned long superio_ide_dma_status[2];
#define SUPERIO_IDE_MAX_RETRIES 25
/* Because of a defect in Super I/O, all reads of the PCI DMA status
* registers, IDE status register and the IDE select register need to be
* retried
*/
static u8 superio_ide_inb (unsigned long port)
{
if (port == superio_ide_status[0] ||
port == superio_ide_status[1] ||
port == superio_ide_select[0] ||
port == superio_ide_select[1] ||
port == superio_ide_dma_status[0] ||
port == superio_ide_dma_status[1]) {
u8 tmp;
int retries = SUPERIO_IDE_MAX_RETRIES;
/* printk(" [ reading port 0x%x with retry ] ", port); */
do {
tmp = inb(port);
if (tmp == 0)
udelay(50);
} while (tmp == 0 && retries-- > 0);
return tmp;
}
return inb(port);
}
static void __devinit superio_ide_init_iops (struct hwif_s *hwif)
{
struct pci_dev *pdev = to_pci_dev(hwif->dev);
u32 base, dmabase;
u8 port = hwif->channel, tmp;
base = pci_resource_start(pdev, port * 2) & ~3;
dmabase = pci_resource_start(pdev, 4) & ~3;
superio_ide_status[port] = base + IDE_STATUS_OFFSET;
superio_ide_select[port] = base + IDE_SELECT_OFFSET;
superio_ide_dma_status[port] = dmabase + (!port ? 2 : 0xa);
/* Clear error/interrupt, enable dma */
tmp = superio_ide_inb(superio_ide_dma_status[port]);
outb(tmp | 0x66, superio_ide_dma_status[port]);
/* We need to override inb to workaround a SuperIO errata */
hwif->INB = superio_ide_inb;
}
static void __devinit init_iops_ns87415(ide_hwif_t *hwif)
{
struct pci_dev *dev = to_pci_dev(hwif->dev);
if (PCI_SLOT(dev->devfn) == 0xE)
/* Built-in - assume it's under superio. */
superio_ide_init_iops(hwif);
}
#endif
static unsigned int ns87415_count = 0, ns87415_control[MAX_HWIFS] = { 0 };
/*
* This routine either enables/disables (according to drive->present)
* the IRQ associated with the port (HWIF(drive)),
* and selects either PIO or DMA handshaking for the next I/O operation.
*/
static void ns87415_prepare_drive (ide_drive_t *drive, unsigned int use_dma)
{
ide_hwif_t *hwif = HWIF(drive);
struct pci_dev *dev = to_pci_dev(hwif->dev);
unsigned int bit, other, new, *old = (unsigned int *) hwif->select_data;
unsigned long flags;
local_irq_save(flags);
new = *old;
/* Adjust IRQ enable bit */
bit = 1 << (8 + hwif->channel);
new = drive->present ? (new & ~bit) : (new | bit);
/* Select PIO or DMA, DMA may only be selected for one drive/channel. */
bit = 1 << (20 + drive->select.b.unit + (hwif->channel << 1));
other = 1 << (20 + (1 - drive->select.b.unit) + (hwif->channel << 1));
new = use_dma ? ((new & ~other) | bit) : (new & ~bit);
if (new != *old) {
unsigned char stat;
/*
* Don't change DMA engine settings while Write Buffers
* are busy.
*/
(void) pci_read_config_byte(dev, 0x43, &stat);
while (stat & 0x03) {
udelay(1);
(void) pci_read_config_byte(dev, 0x43, &stat);
}
*old = new;
(void) pci_write_config_dword(dev, 0x40, new);
/*
* And let things settle...
*/
udelay(10);
}
local_irq_restore(flags);
}
static void ns87415_selectproc (ide_drive_t *drive)
{
ns87415_prepare_drive (drive, drive->using_dma);
}
static int ns87415_ide_dma_end (ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
u8 dma_stat = 0, dma_cmd = 0;
drive->waiting_for_dma = 0;
dma_stat = hwif->INB(hwif->dma_status);
/* get dma command mode */
dma_cmd = hwif->INB(hwif->dma_command);
/* stop DMA */
outb(dma_cmd & ~1, hwif->dma_command);
/* from ERRATA: clear the INTR & ERROR bits */
dma_cmd = hwif->INB(hwif->dma_command);
outb(dma_cmd | 6, hwif->dma_command);
/* and free any DMA resources */
ide_destroy_dmatable(drive);
/* verify good DMA status */
return (dma_stat & 7) != 4;
}
static int ns87415_ide_dma_setup(ide_drive_t *drive)
{
/* select DMA xfer */
ns87415_prepare_drive(drive, 1);
if (!ide_dma_setup(drive))
return 0;
/* DMA failed: select PIO xfer */
ns87415_prepare_drive(drive, 0);
return 1;
}
#ifndef ide_default_irq
#define ide_default_irq(irq) 0
#endif
static void __devinit init_hwif_ns87415 (ide_hwif_t *hwif)
{
struct pci_dev *dev = to_pci_dev(hwif->dev);
unsigned int ctrl, using_inta;
u8 progif;
#ifdef __sparc_v9__
int timeout;
u8 stat;
#endif
hwif->selectproc = &ns87415_selectproc;
/*
* We cannot probe for IRQ: both ports share common IRQ on INTA.
* Also, leave IRQ masked during drive probing, to prevent infinite
* interrupts from a potentially floating INTA..
*
* IRQs get unmasked in selectproc when drive is first used.
*/
(void) pci_read_config_dword(dev, 0x40, &ctrl);
(void) pci_read_config_byte(dev, 0x09, &progif);
/* is irq in "native" mode? */
using_inta = progif & (1 << (hwif->channel << 1));
if (!using_inta)
using_inta = ctrl & (1 << (4 + hwif->channel));
if (hwif->mate) {
hwif->select_data = hwif->mate->select_data;
} else {
hwif->select_data = (unsigned long)
&ns87415_control[ns87415_count++];
ctrl |= (1 << 8) | (1 << 9); /* mask both IRQs */
if (using_inta)
ctrl &= ~(1 << 6); /* unmask INTA */
*((unsigned int *)hwif->select_data) = ctrl;
(void) pci_write_config_dword(dev, 0x40, ctrl);
/*
* Set prefetch size to 512 bytes for both ports,
* but don't turn on/off prefetching here.
*/
pci_write_config_byte(dev, 0x55, 0xee);
#ifdef __sparc_v9__
/*
* XXX: Reset the device, if we don't it will not respond to
* SELECT_DRIVE() properly during first ide_probe_port().
*/
timeout = 10000;
outb(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
udelay(10);
outb(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
do {
udelay(50);
stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
if (stat == 0xff)
break;
} while ((stat & BUSY_STAT) && --timeout);
#endif
}
if (!using_inta)
hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]);
else if (!hwif->irq && hwif->mate && hwif->mate->irq)
hwif->irq = hwif->mate->irq; /* share IRQ with mate */
if (!hwif->dma_base)
return;
outb(0x60, hwif->dma_status);
hwif->dma_setup = &ns87415_ide_dma_setup;
hwif->ide_dma_end = &ns87415_ide_dma_end;
}
static const struct ide_port_info ns87415_chipset __devinitdata = {
.name = "NS87415",
#ifdef CONFIG_SUPERIO
.init_iops = init_iops_ns87415,
#endif
.init_hwif = init_hwif_ns87415,
.host_flags = IDE_HFLAG_TRUST_BIOS_FOR_DMA |
IDE_HFLAG_NO_ATAPI_DMA,
};
static int __devinit ns87415_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
return ide_setup_pci_device(dev, &ns87415_chipset);
}
static const struct pci_device_id ns87415_pci_tbl[] = {
{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87415), 0 },
{ 0, },
};
MODULE_DEVICE_TABLE(pci, ns87415_pci_tbl);
static struct pci_driver driver = {
.name = "NS87415_IDE",
.id_table = ns87415_pci_tbl,
.probe = ns87415_init_one,
};
static int __init ns87415_ide_init(void)
{
return ide_pci_register_driver(&driver);
}
module_init(ns87415_ide_init);
MODULE_AUTHOR("Mark Lord, Eddie Dost, Andre Hedrick");
MODULE_DESCRIPTION("PCI driver module for NS87415 IDE");
MODULE_LICENSE("GPL");
