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/*
* cmd64x.c: Enable interrupts at initialization time on Ultra/PCI machines.
* Due to massive hardware bugs, UltraDMA is only supported
* on the 646U2 and not on the 646U.
*
* Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
* Copyright (C) 1998 David S. Miller (davem@redhat.com)
*
* Copyright (C) 1999-2002 Andre Hedrick <andre@linux-ide.org>
* Copyright (C) 2007-2010 Bartlomiej Zolnierkiewicz
* Copyright (C) 2007,2009 MontaVista Software, Inc. <source@mvista.com>
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/ide.h>
#include <linux/init.h>
#include <asm/io.h>
#define DRV_NAME "cmd64x"
/*
* CMD64x specific registers definition.
*/
#define CFR 0x50
#define CFR_INTR_CH0 0x04
#define CMDTIM 0x52
#define ARTTIM0 0x53
#define DRWTIM0 0x54
#define ARTTIM1 0x55
#define DRWTIM1 0x56
#define ARTTIM23 0x57
#define ARTTIM23_DIS_RA2 0x04
#define ARTTIM23_DIS_RA3 0x08
#define ARTTIM23_INTR_CH1 0x10
#define DRWTIM2 0x58
#define BRST 0x59
#define DRWTIM3 0x5b
#define BMIDECR0 0x70
#define MRDMODE 0x71
#define MRDMODE_INTR_CH0 0x04
#define MRDMODE_INTR_CH1 0x08
#define UDIDETCR0 0x73
#define DTPR0 0x74
#define BMIDECR1 0x78
#define BMIDECSR 0x79
#define UDIDETCR1 0x7B
#define DTPR1 0x7C
static void cmd64x_program_timings(ide_drive_t *drive, u8 mode)
{
ide_hwif_t *hwif = drive->hwif;
struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
int bus_speed = ide_pci_clk ? ide_pci_clk : 33;
const unsigned long T = 1000000 / bus_speed;
static const u8 recovery_values[] =
{15, 15, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 0};
static const u8 setup_values[] = {0x40, 0x40, 0x40, 0x80, 0, 0xc0};
static const u8 arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23};
static const u8 drwtim_regs[4] = {DRWTIM0, DRWTIM1, DRWTIM2, DRWTIM3};
struct ide_timing t;
u8 arttim = 0;
ide_timing_compute(drive, mode, &t, T, 0);
/*
* In case we've got too long recovery phase, try to lengthen
* the active phase
*/
if (t.recover > 16) {
t.active += t.recover - 16;
t.recover = 16;
}
if (t.active > 16) /* shouldn't actually happen... */
t.active = 16;
/*
* Convert values to internal chipset representation
*/
t.recover = recovery_values[t.recover];
t.active &= 0x0f;
/* Program the active/recovery counts into the DRWTIM register */
pci_write_config_byte(dev, drwtim_regs[drive->dn],
(t.active << 4) | t.recover);
/*
* The primary channel has individual address setup timing registers
* for each drive and the hardware selects the slowest timing itself.
* The secondary channel has one common register and we have to select
* the slowest address setup timing ourselves.
*/
if (hwif->channel) {
ide_drive_t *pair = ide_get_pair_dev(drive);
if (pair) {
struct ide_timing tp;
ide_timing_compute(pair, pair->pio_mode, &tp, T, 0);
ide_timing_merge(&t, &tp, &t, IDE_TIMING_SETUP);
if (pair->dma_mode) {
ide_timing_compute(pair, pair->dma_mode,
&tp, T, 0);
ide_timing_merge(&tp, &t, &t, IDE_TIMING_SETUP);
}
}
}
if (t.setup > 5) /* shouldn't actually happen... */
t.setup = 5;
/*
* Program the address setup clocks into the ARTTIM registers.
* Avoid clearing the secondary channel's interrupt bit.
*/
(void) pci_read_config_byte (dev, arttim_regs[drive->dn], &arttim);
if (hwif->channel)
arttim &= ~ARTTIM23_INTR_CH1;
arttim &= ~0xc0;
arttim |= setup_values[t.setup];
(void) pci_write_config_byte(dev, arttim_regs[drive->dn], arttim);
}
/*
* Attempts to set drive's PIO mode.
* Special cases are 8: prefetch off, 9: prefetch on (both never worked)
*/
static void cmd64x_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
{
const u8 pio = drive->pio_mode - XFER_PIO_0;
/*
* Filter out the prefetch control values
* to prevent PIO5 from being programmed
*/
if (pio == 8 || pio == 9)
return;
cmd64x_program_timings(drive, XFER_PIO_0 + pio);
}
static void cmd64x_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
{
struct pci_dev *dev = to_pci_dev(hwif->dev);
u8 unit = drive->dn & 0x01;
u8 regU = 0, pciU = hwif->channel ? UDIDETCR1 : UDIDETCR0;
const u8 speed = drive->dma_mode;
pci_read_config_byte(dev, pciU, ®U);
regU &= ~(unit ? 0xCA : 0x35);
switch(speed) {
case XFER_UDMA_5:
regU |= unit ? 0x0A : 0x05;
break;
case XFER_UDMA_4:
regU |= unit ? 0x4A : 0x15;
break;
case XFER_UDMA_3:
regU |= unit ? 0x8A : 0x25;
break;
case XFER_UDMA_2:
regU |= unit ? 0x42 : 0x11;
break;
case XFER_UDMA_1:
regU |= unit ? 0x82 : 0x21;
break;
case XFER_UDMA_0:
regU |= unit ? 0xC2 : 0x31;
break;
case XFER_MW_DMA_2:
case XFER_MW_DMA_1:
case XFER_MW_DMA_0:
cmd64x_program_timings(drive, speed);
break;
}
pci_write_config_byte(dev, pciU, regU);
}
static void cmd648_clear_irq(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
struct pci_dev *dev = to_pci_dev(hwif->dev);
unsigned long base = pci_resource_start(dev, 4);
u8 irq_mask = hwif->channel ? MRDMODE_INTR_CH1 :
MRDMODE_INTR_CH0;
u8 mrdmode = inb(base + 1);
/* clear the interrupt bit */
outb((mrdmode & ~(MRDMODE_INTR_CH0 | MRDMODE_INTR_CH1)) | irq_mask,
base + 1);
}
static void cmd64x_clear_irq(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
struct pci_dev *dev = to_pci_dev(hwif->dev);
int irq_reg = hwif->channel ? ARTTIM23 : CFR;
u8 irq_mask = hwif->channel ? ARTTIM23_INTR_CH1 :
CFR_INTR_CH0;
u8 irq_stat = 0;
(void) pci_read_config_byte(dev, irq_reg, &irq_stat);
/* clear the interrupt bit */
(void) pci_write_config_byte(dev, irq_reg, irq_stat | irq_mask);
}
static int cmd648_test_irq(ide_hwif_t *hwif)
{
struct pci_dev *dev = to_pci_dev(hwif->dev);
unsigned long base = pci_resource_start(dev, 4);
u8 irq_mask = hwif->channel ? MRDMODE_INTR_CH1 :
MRDMODE_INTR_CH0;
u8 mrdmode = inb(base + 1);
pr_debug("%s: mrdmode: 0x%02x irq_mask: 0x%02x\n",
hwif->name, mrdmode, irq_mask);
return (mrdmode & irq_mask) ? 1 : 0;
}
static int cmd64x_test_irq(ide_hwif_t *hwif)
{
struct pci_dev *dev = to_pci_dev(hwif->dev);
int irq_reg = hwif->channel ? ARTTIM23 : CFR;
u8 irq_mask = hwif->channel ? ARTTIM23_INTR_CH1 :
CFR_INTR_CH0;
u8 irq_stat = 0;
(void) pci_read_config_byte(dev, irq_reg, &irq_stat);
pr_debug("%s: irq_stat: 0x%02x irq_mask: 0x%02x\n",
hwif->name, irq_stat, irq_mask);
return
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