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* Support for IDE interfaces on PowerMacs.
* These IDE interfaces are memory-mapped and have a DBDMA channel
* for doing DMA.
*
* Copyright (C) 1998 Paul Mackerras.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Some code taken from drivers/block/ide-dma.c:
*
* Copyright (c) 1995-1998 Mark Lord
*
*/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <asm/prom.h>
#include <asm/io.h>
#include <asm/dbdma.h>
#include <asm/ide.h>
#include <asm/mediabay.h>
#include <asm/feature.h>
#ifdef CONFIG_PMAC_PBOOK
#include <asm/adb.h>
#include <asm/pmu.h>
#include <asm/irq.h>
#endif
#include "ide.h"
#include "ide_modes.h"
ide_ioreg_t pmac_ide_regbase[MAX_HWIFS];
int pmac_ide_irq[MAX_HWIFS];
int pmac_ide_count;
struct device_node *pmac_ide_node[MAX_HWIFS];
#ifdef CONFIG_BLK_DEV_IDEDMA_PMAC
#define MAX_DCMDS 256 /* allow up to 256 DBDMA commands per xfer */
static void pmac_ide_setup_dma(struct device_node *np, ide_hwif_t *hwif);
static int pmac_ide_dmaproc(ide_dma_action_t func, ide_drive_t *drive);
static int pmac_ide_build_dmatable(ide_drive_t *drive, int wr);
#endif /* CONFIG_BLK_DEV_IDEDMA_PMAC */
#ifdef CONFIG_PMAC_PBOOK
static int idepmac_notify(struct pmu_sleep_notifier *self, int when);
struct pmu_sleep_notifier idepmac_sleep_notifier = {
idepmac_notify, SLEEP_LEVEL_BLOCK,
};
#endif /* CONFIG_PMAC_PBOOK */
/*
* N.B. this can't be an initfunc, because the media-bay task can
* call ide_[un]register at any time.
*/
void
pmac_ide_init_hwif_ports(ide_ioreg_t *p, ide_ioreg_t base, int *irq)
{
int i, ix;
*p = 0;
if (base == 0)
return;
for (ix = 0; ix < MAX_HWIFS; ++ix)
if (base == pmac_ide_regbase[ix])
break;
if (ix >= MAX_HWIFS) {
/* Probably a PCI interface... */
for (i = 0; i < 8; ++i)
*p++ = base + i;
/* XXX is this right? */
*p = 0;
if (irq != 0)
*irq = 0;
return;
}
/* we check only for -EINVAL meaning that we have found a matching
bay but with the wrong device type */
i = check_media_bay_by_base(base, MB_CD);
if (i == -EINVAL)
return;
for (i = 0; i < 8; ++i)
*p++ = base + i * 0x10;
*p = base + 0x160;
if (irq != NULL)
*irq = pmac_ide_irq[ix];
}
void pmac_ide_tuneproc(ide_drive_t *drive, byte pio)
{
ide_pio_data_t d;
if (_machine != _MACH_Pmac)
return;
pio = ide_get_best_pio_mode(drive, pio, 4, &d);
switch (pio) {
case 4:
out_le32((unsigned *)(IDE_DATA_REG + 0x200 + _IO_BASE), 0x211025);
break;
default:
out_le32((unsigned *)(IDE_DATA_REG + 0x200 + _IO_BASE), 0x2f8526);
break;
}
}
__initfunc(void
pmac_ide_probe(void))
{
struct device_node *np;
int i;
struct device_node *atas;
struct device_node *p, **pp, *removables, **rp;
unsigned long base;
int irq;
ide_hwif_t *hwif;
if (_machine != _MACH_Pmac)
return;
pp = &atas;
rp = &removables;
p = find_devices("ATA");
if (p == NULL)
p = find_devices("IDE");
if (p == NULL)
p = find_type_devices("ide");
if (p == NULL)
p = find_type_devices("ata");
/* Move removable devices such as the media-bay CDROM
on the PB3400 to the end of the list. */
for (; p != NULL; p = p->next) {
if (p->parent && p->parent->type
&& strcasecmp(p->parent->type, "media-bay") == 0) {
*rp = p;
rp = &p->next;
} else {
*pp = p;
pp = &p->next;
}
}
*rp = NULL;
*pp = removables;
for (i = 0, np = atas; i < MAX_HWIFS && np != NULL; np = np->next) {
struct device_node *tp;
/*
* If this node is not under a mac-io or dbdma node,
* leave it to the generic PCI driver.
*/
for (tp = np->parent; tp != 0; tp = tp->parent)
if (tp->type && (strcmp(tp->type, "mac-io") == 0
|| strcmp(tp->type, "dbdma") == 0))
break;
if (tp == 0)
continue;
if (np->n_addrs == 0) {
printk(KERN_WARNING "ide: no address for device %s\n",
np->full_name);
continue;
}
/*
* If this slot is taken (e.g. by ide-pci.c) try the next one.
*/
while (i < MAX_HWIFS
&& ide_hwifs[i].io_ports[IDE_DATA_OFFSET] != 0)
++i;
if (i >= MAX_HWIFS)
break;
base = (unsigned long) ioremap(np->addrs[0].address, 0x200) - _IO_BASE;
/* XXX This is bogus. Should be fixed in the registry by checking
the kind of host interrupt controller, a bit like gatwick
fixes in irq.c
*/
if (np->n_intrs == 0) {
printk("ide: no intrs for device %s, using 13\n",
np->full_name);
irq = 13;
} else {
irq = np->intrs[0].line;
}
pmac_ide_regbase[i] = base;
pmac_ide_irq[i] = irq;
pmac_ide_node[i] = np;
if (np->parent && np->parent->name
&& strcasecmp(np->parent->name, "media-bay") == 0) {
media_bay_set_ide_infos(np->parent,base,irq,i);
} else
feature_set(np, FEATURE_IDE_enable);
hwif = &ide_hwifs[i];
pmac_ide_init_hwif_ports(hwif->io_ports, base, &hwif->irq);
hwif->chipset = ide_generic;
hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
hwif->tuneproc = pmac_ide_tuneproc;
#ifdef CONFIG_BLK_DEV_IDEDMA_PMAC
if (np->n_addrs >= 2) {
/* has a DBDMA controller channel */
pmac_ide_setup_dma(np, hwif);
}
#endif /* CONFIG_BLK_DEV_IDEDMA_PMAC */
++i;
}
pmac_ide_count = i;
#ifdef CONFIG_PMAC_PBOOK
pmu_register_sleep_notifier(&idepmac_sleep_notifier);
#endif /* CONFIG_PMAC_PBOOK */
}
#ifdef CONFIG_BLK_DEV_IDEDMA_PMAC
__initfunc(static void
pmac_ide_setup_dma(struct device_node *np, ide_hwif_t *hwif))
{
hwif->dma_base = (unsigned long) ioremap(np->addrs[1].address, 0x200);
/*
* Allocate space for the DBDMA commands.
* The +2 is +1 for the stop command and +1 to allow for
* aligning the start address to a multiple of 16 bytes.
*/
hwif->dmatable = (unsigned long *)
kmalloc((MAX_DCMDS + 2) * sizeof(struct dbdma_cmd), GFP_KERNEL);
if (hwif->dmatable == 0) {
printk(KERN_ERR "%s: unable to allocate DMA command list\n",
hwif->name);
return;
}
hwif->dmaproc = &pmac_ide_dmaproc;
#ifdef CONFIG_PMAC_IDEDMA_AUTO
hwif->autodma = 1;
#endif
}
/*
* pmac_ide_build_dmatable builds the DBDMA command list
* for a transfer and sets the DBDMA channel to point to it.
*/
static int
pmac_ide_build_dmatable(ide_drive_t *drive, int wr)
{
ide_hwif_t *hwif = HWIF(drive);
struct dbdma_cmd *table, *tstart;
int count = 0;
struct request *rq = HWGROUP(drive)->rq;
struct buffer_head *bh = rq->bh;
unsigned int size, addr;
volatile struct dbdma_regs *dma
= (volatile struct dbdma_regs *) hwif->dma_base;
table = tstart = (struct dbdma_cmd *) DBDMA_ALIGN(hwif->dmatable);
out_le32(&dma->control, (RUN|PAUSE|FLUSH|WAKE|DEAD) << 16);
do {
/*
* Determine addr and size of next buffer area. We assume that
* individual virtual buffers are always composed linearly in
* physical memory. For example, we assume that any 8kB buffer
* is always composed of two adjacent physical 4kB pages rather
* than two possibly non-adjacent physical 4kB pages.
*/
if (bh == NULL) { /* paging requests have (rq->bh == NULL) */
addr = virt_to_bus(rq->buffer);
size = rq->nr_sectors << 9;
} else {
/* group sequential buffers into one large buffer */
addr = virt_to_bus(bh->b_data);
size = bh->b_size;
while ((bh = bh->b_reqnext) != NULL) {
if ((addr + size) != virt_to_bus(bh->b_data))
break;
size += bh->b_size;
}
}
/*
* Fill in the next DBDMA command block.
* Note that one DBDMA command can transfer
* at most 65535 bytes.
*/
while (size) {
unsigned int tc = (size < 0xfe00)? size: 0xfe00;
if (++count >= MAX_DCMDS) {
printk("%s: DMA table too small\n",
drive->name);
return 0; /* revert to PIO for this request */
}
st_le16(&table->command, wr? OUTPUT_MORE: INPUT_MORE);
st_le16(&table->req_count, tc);
st_le32(&table->phy_addr, addr);
table->cmd_dep = 0;
table->xfer_status = 0;
table->res_count = 0;
addr += tc;
size -= tc;
++table;
}
} while (bh != NULL);
/* convert the last command to an input/output last command */
if (count)
st_le16(&table[-1].command, wr? OUTPUT_LAST: INPUT_LAST);
else
printk(KERN_DEBUG "%s: empty DMA table?\n", drive->name);
/* add the stop command to the end of the list */
memset(table, 0, sizeof(struct dbdma_cmd));
out_le16(&table->command, DBDMA_STOP);
out_le32(&dma->cmdptr, virt_to_bus(tstart));
return 1;
}
int pmac_ide_dmaproc(ide_dma_action_t func, ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
volatile struct dbdma_regs *dma
= (volatile struct dbdma_regs *) hwif->dma_base;
int dstat;
switch (func) {
case ide_dma_on:
/* ide-floppy DMA doesn't work yet... */
drive->using_dma = drive->media != ide_floppy;
break;
case ide_dma_off:
printk(KERN_INFO "%s: DMA disabled\n", drive->name);
case ide_dma_off_quietly:
drive->using_dma = 0;
break;
case ide_dma_check:
/* ide-floppy DMA doesn't work yet... */
drive->using_dma = hwif->autodma && drive->media != ide_floppy;
break;
case ide_dma_read:
case ide_dma_write:
if (!pmac_ide_build_dmatable(drive, func==ide_dma_write))
return 1;
drive->waiting_for_dma = 1;
if (drive->media != ide_disk)
return 0;
ide_set_handler(drive, &ide_dma_intr, WAIT_CMD);
OUT_BYTE(func==ide_dma_write? WIN_WRITEDMA: WIN_READDMA,
IDE_COMMAND_REG);
case ide_dma_begin:
out_le32(&dma->control, (RUN << 16) | RUN);
break;
case ide_dma_end:
drive->waiting_for_dma = 0;
dstat = in_le32(&dma->status);
out_le32(&dma->control, ((RUN|WAKE|DEAD) << 16));
/* verify good dma status */
return (dstat & (RUN|DEAD|ACTIVE)) != RUN;
case ide_dma_test_irq:
return (in_le32(&dma->status) & (RUN|ACTIVE)) == RUN;
default:
printk(KERN_ERR "pmac_ide_dmaproc: bad func %d\n", func);
}
return 0;
}
#endif /* CONFIG_BLK_DEV_IDEDMA_PMAC */
#ifdef CONFIG_PMAC_PBOOK
static void idepmac_sleep_disk(int i, unsigned long base)
{
int j;
/* Reset to PIO 0 */
out_le32((unsigned *)(base + 0x200 + _IO_BASE), 0x2f8526);
/* FIXME: We only handle the master IDE */
if (ide_hwifs[i].drives[0].media == ide_disk) {
/* Spin down the drive */
outb(0xa0, base+0x60);
outb(0x0, base+0x30);
outb(0x0, base+0x20);
outb(0x0, base+0x40);
outb(0x0, base+0x50);
outb(0xe0, base+0x70);
outb(0x2, base+0x160);
for (j = 0; j < 10; j++) {
int status;
mdelay(100);
status = inb(base+0x70);
if (!(status & BUSY_STAT) && (status & DRQ_STAT))
break;
}
}
}
static void idepmac_wake_disk(int i, unsigned long base)
{
int j;
/* Revive IDE disk and controller */
feature_set(pmac_ide_node[i], FEATURE_IDE_enable);
mdelay(1);
feature_set(pmac_ide_node[i], FEATURE_IDE_DiskPower);
mdelay(100);
feature_set(pmac_ide_node[i], FEATURE_IDE_Reset);
mdelay(1);
/* Make sure we are still PIO0 */
out_le32((unsigned *)(base + 0x200 + _IO_BASE), 0x2f8526);
mdelay(100);
/* Wait up to 10 seconds (enough for recent drives) */
for (j = 0; j < 100; j++) {
int status;
mdelay(100);
status = inb(base + 0x70);
if (!(status & BUSY_STAT))
break;
}
}
/* Here we handle media bay devices */
static void
idepmac_wake_bay(int i, unsigned long base)
{
int timeout;
timeout = 5000;
while ((inb(base + 0x70) & BUSY_STAT) && timeout) {
mdelay(1);
--timeout;
}
}
static int idepmac_notify(struct pmu_sleep_notifier *self, int when)
{
int i, ret;
unsigned long base;
switch (when) {
case PBOOK_SLEEP_REQUEST:
break;
case PBOOK_SLEEP_REJECT:
break;
case PBOOK_SLEEP_NOW:
for (i = 0; i < pmac_ide_count; ++i) {
if ((base = pmac_ide_regbase[i]) == 0)
continue;
/* Disable irq during sleep */
disable_irq(pmac_ide_irq[i]);
/* Put the disk to sleep */
idepmac_sleep_disk(i, base);
}
break;
case PBOOK_WAKE:
for (i = 0; i < pmac_ide_count; ++i) {
if ((base = pmac_ide_regbase[i]) == 0)
continue;
/* We don't handle media bay devices this way */
ret = check_media_bay_by_base(base, MB_CD);
if (ret == -ENODEV)
idepmac_wake_disk(i, base);
else if (ret == 0)
idepmac_wake_bay(i, base);
enable_irq(pmac_ide_irq[i]);
}
break;
}
return PBOOK_SLEEP_OK;
}
#endif /* CONFIG_PMAC_PBOOK */
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