Michael,
Here is a patch to have drivers/ide use polling
for all operations, in addition to IRQs.
Patch is against 2.6.21, but should apply and work equally well
on earlier kernels (including 2.6.14).
This quick hack is *not* for general kernel inclusion.
It works for me. I tested it using a CF card in a PC-CARD adapter.
Signed-off-by: Mark Lord <mlord@xxxxxxxxx>
--- 2.6.21/drivers/ide/ide-probe.c 2007-04-11 00:18:51.000000000 -0400
+++ new/drivers/ide/ide-probe.c 2007-04-12 09:26:14.000000000 -0400
@@ -1014,6 +1014,27 @@
* but anything else has led to problems on some machines. We re-enable
* interrupts as much as we can safely do in most places.
*/
+struct timer_list polling_timer;
+static void ide_polling (unsigned long data)
+{
+ ide_hwgroup_t *hwgroup = (void *)data;
+ ide_hwif_t *hwif;
+ int irq = 0;
+
+ if (hwgroup) {
+ hwif = hwgroup->hwif;
+ if (hwif)
+ irq = hwif->irq;
+ }
+
+ ide_intr(irq, hwgroup);
+ init_timer(&polling_timer);
+ polling_timer.expires = jiffies + 1;
+ polling_timer.function = &ide_polling;
+ polling_timer.data = (unsigned long) hwgroup;
+ add_timer(&polling_timer);
+}
+
static int init_irq (ide_hwif_t *hwif)
{
unsigned int index;
@@ -1110,9 +1131,12 @@
if (hwif->io_ports[IDE_CONTROL_OFFSET])
/* clear nIEN */
hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
-
+#if 0
if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
goto out_unlink;
+#else
+ ide_polling((unsigned long)hwgroup);
+#endif
}
/*
@@ -1156,6 +1180,7 @@
printk("\n");
up(&ide_cfg_sem);
return 0;
+#if 0
out_unlink:
spin_lock_irq(&ide_lock);
if (hwif->next == hwif) {
@@ -1176,6 +1201,7 @@
BUG_ON(hwgroup->hwif == hwif);
}
spin_unlock_irq(&ide_lock);
+#endif
out_up:
up(&ide_cfg_sem);
return 1;
--- 2.6.21/drivers/ide/ide.c 2007-04-11 00:18:51.000000000 -0400
+++ new/drivers/ide/ide.c 2007-04-12 09:31:59.000000000 -0400
@@ -569,6 +569,8 @@
* This is raving bonkers.
*/
+extern struct timer_list polling_timer;
+
void ide_unregister(unsigned int index)
{
ide_drive_t *drive;
@@ -612,7 +614,11 @@
g = g->next;
} while (g != hwgroup->hwif);
if (irq_count == 1)
+#if 0
free_irq(hwif->irq, hwgroup);
+#else
+ del_timer(&polling_timer);
+#endif
spin_lock_irq(&ide_lock);
/*
-
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