Hello.
Bartlomiej Zolnierkiewicz wrote:
* Convert cmd64x, hpt366 and pdc202xx_old host drivers to use
pci_resource_start(hwif->pci_dev, 4) instead of hwif->dma_master.
Before using pci_resource_start(), the code should check
pci_resource_len() to ensure it is the appropriate size.
It would be very wise to ensure that pci_resource_flags()&IORESOURCE_IO
is true, too.
Sure but since the old code hasn't been doing these checks (old code
just did pci_resource_start() -> hwif->dma_base -> hwif->dma_master)
this is a separate issue from what the patch tries to achieve.
Nonetheless this is duplicating an existing bug $N times... not ideal :)
The existing bug is that the methods converted to use pci_resource_start()
may be set in hwif instance and used even if the BAR4 is invalid. Therefore
the above patch is correct and it isn't duplicating the existing bug. :)
However I agree that all these pci_resource_start()s could be a bit confusing
so here is 'take 2'.
Yeah, they are. Actually, I was thinking about such patch ~1.5 years ago
*but* using a different approach -- namely, hwif->extra_base.
[PATCH] ide: remove ->dma_master field from ide_hwif_t (take 2)
* Convert cmd64x, hpt366 and pdc202xx_old host drivers to use
pci_resource_start(hwif->pci_dev, 4) instead of hwif->dma_master.
* Remove no longer needed ->dma_master field from ide_hwif_t.
v2:
* Use the more readable 'hwif->dma_base - (hwif->channel * 8)' instead of
pci_resource_start(hwif->pci_dev, 4).
s/readable/clumsy/? ;-)
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx>
Index: b/drivers/ide/ide-dma.c
===================================================================
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -1006,11 +1006,6 @@ void ide_setup_dma(ide_hwif_t *hwif, uns
hwif->dma_base = base;
- if (hwif->mate)
- hwif->dma_master = hwif->channel ? hwif->mate->dma_base : base;
- else
- hwif->dma_master = base;
-
if (!(hwif->dma_command))
hwif->dma_command = hwif->dma_base;
if (!(hwif->dma_vendor1))
Ugh, these extra parens... :-)
[...]
Index: b/drivers/ide/pci/cmd64x.c
===================================================================
--- a/drivers/ide/pci/cmd64x.c
+++ b/drivers/ide/pci/cmd64x.c
@@ -333,13 +333,14 @@ static void cmd64x_set_dma_mode(ide_driv
static int cmd648_ide_dma_end (ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
+ unsigned long addr = hwif->dma_base - (hwif->channel * 8) + 0x01;
Dunno... pci_resource_start() looked better to my taste. Except I'd
probably called the variable 'base' and wouldn't + 0x01 right away.
int err = __ide_dma_end(drive);
u8 irq_mask = hwif->channel ? MRDMODE_INTR_CH1 :
MRDMODE_INTR_CH0;
- u8 mrdmode = inb(hwif->dma_master + 0x01);
+ u8 mrdmode = inb(addr);
/* clear the interrupt bit */
- outb(mrdmode | irq_mask, hwif->dma_master + 0x01);
+ outb(mrdmode | irq_mask, addr);
return err;
}
@@ -364,10 +365,11 @@ static int cmd64x_ide_dma_end (ide_drive
static int cmd648_ide_dma_test_irq (ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
+ unsigned long addr = hwif->dma_base - (hwif->channel * 8) + 0x01;
Same comment here...
u8 irq_mask = hwif->channel ? MRDMODE_INTR_CH1 :
MRDMODE_INTR_CH0;
u8 dma_stat = inb(hwif->dma_status);
- u8 mrdmode = inb(hwif->dma_master + 0x01);
+ u8 mrdmode = inb(addr);
#ifdef DEBUG
printk("%s: dma_stat: 0x%02x mrdmode: 0x%02x irq_mask: 0x%02x\n",
Index: b/drivers/ide/pci/hpt366.c
===================================================================
--- a/drivers/ide/pci/hpt366.c
+++ b/drivers/ide/pci/hpt366.c
@@ -845,32 +845,33 @@ static int hpt374_ide_dma_end(ide_drive_
This just asks to be:
static void hpt3xxn_set_clock(ide_hwif_t *hwif, u8 mode)
{
unsigned long base = hwif->extra_base;
u8 scr2 = inb(base + 0x5b);
if ((scr2 & 0x7f) == mode)
return;
/* Tristate the bus */
outb(0x80, base + 0x53);
outb(0x80, base + 0x57);
/* Switch clock and reset channels */
outb(mode, base + 0x5b);
outb(0xc0, base + 0x59);
/*
* Reset the state machines.
* NOTE: avoid accidentally enabling the disabled channels.
*/
outb(inb(base + 0x50) | 0x32, base + 0x50);
outb(inb(base + 0x54) | 0x32, base + 0x54);
/* Complete reset */
outb(0x00, base + 0x59);
/* Reconnect channels to bus */
outb(0x00, base + 0x53);
outb(0x00, base + 0x57);
}
Index: b/drivers/ide/pci/pdc202xx_old.c
===================================================================
--- a/drivers/ide/pci/pdc202xx_old.c
+++ b/drivers/ide/pci/pdc202xx_old.c
@@ -162,7 +162,7 @@ static u8 pdc202xx_old_cable_detect (ide
And this asks to be:
*/
static void pdc_old_enable_66MHz_clock(ide_hwif_t *hwif)
{
- unsigned long clock_reg = hwif->dma_master + 0x11;
+ unsigned long clock_reg = hwif->extra_base + 0x01;
u8 clock = inb(clock_reg);
outb(clock | (hwif->channel ? 0x08 : 0x02), clock_reg);
@@ -170,7 +170,7 @@ static void pdc_old_enable_66MHz_clock(i
static void pdc_old_disable_66MHz_clock(ide_hwif_t *hwif)
{
- unsigned long clock_reg = hwif->dma_master + 0x11;
+ unsigned long clock_reg = hwif->extra_base + 0x01;
u8 clock = inb(clock_reg);
outb(clock & ~(hwif->channel ? 0x08 : 0x02), clock_reg);
@@ -193,7 +193,7 @@ static void pdc202xx_old_ide_dma_start(i
if (drive->media != ide_disk || drive->addressing == 1) {
struct request *rq = HWGROUP(drive)->rq;
ide_hwif_t *hwif = HWIF(drive);
- unsigned long high_16 = hwif->dma_master;
+ unsigned long high_16 = hwif->extra_base;
unsigned long atapi_reg = high_16 + (hwif->channel ? 0x24 : 0x20);
u32 word_count = 0;
u8 clock = inb(high_16 + 0x11);
@@ -212,7 +212,7 @@ static int pdc202xx_old_ide_dma_end(ide_
{
if (drive->media != ide_disk || drive->addressing == 1) {
ide_hwif_t *hwif = HWIF(drive);
- unsigned long high_16 = hwif->dma_master;
+ unsigned long high_16 = hwif->extra_base;
unsigned long atapi_reg = high_16 + (hwif->channel ? 0x24 : 0x20);
u8 clock = 0;
@@ -228,7 +228,7 @@ static int pdc202xx_old_ide_dma_end(ide_
static int pdc202xx_old_ide_dma_test_irq(ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
- unsigned long high_16 = hwif->dma_master;
+ unsigned long high_16 = hwif->extra_base;
u8 dma_stat = inb(hwif->dma_status);
u8 sc1d = inb(high_16 + 0x001d);
@@ -271,7 +271,7 @@ static void pdc202xx_dma_timeout(ide_dri
static void pdc202xx_reset_host (ide_hwif_t *hwif)
{
- unsigned long high_16 = hwif->dma_master;
+ unsigned long high_16 = hwif->dma_base - (hwif->channel * 8);
unsigned long high_16 = hwif->extra_base;
u8 udma_speed_flag = inb(high_16 | 0x001f);
MBR, Sergei
-
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