The IDE core looks at the wrong bit when checking if the secondary channel is
enabled on PCI0646 -- CFR bit 8 is read-ahead disable, bit 3 is the correct one.
Starting with PCI0646U chip, the primary channel can also be enbled/disabled --
so, add 'enablebits' initializers to each 'ide_pci_device_t' structure, handling
the original PCI0646 via adding the init_setup() method and clearing the 'reg'
field there if necessary...
Signed-off-by: Sergei Shtylyov <sshtylyov@xxxxxxxxxxxxx>
---
Warning: compile-tested only, use on your own risk! ;-)
drivers/ide/pci/cmd64x.c | 39 ++++++++++++++++++++++++++++++++++++---
1 files changed, 36 insertions(+), 3 deletions(-)
Index: linux-2.6/drivers/ide/pci/cmd64x.c
===================================================================
--- linux-2.6.orig/drivers/ide/pci/cmd64x.c
+++ linux-2.6/drivers/ide/pci/cmd64x.c
@@ -1,6 +1,6 @@
/* $Id: cmd64x.c,v 1.21 2000/01/30 23:23:16
*
- * linux/drivers/ide/pci/cmd64x.c Version 1.44 Feb 13, 2007
+ * linux/drivers/ide/pci/cmd64x.c Version 1.45 Feb 14, 2007
*
* cmd64x.c: Enable interrupts at initialization time on Ultra/PCI machines.
* Note, this driver is not used at all on other systems because
@@ -705,42 +705,75 @@ static void __devinit init_hwif_cmd64x(i
hwif->drives[1].autodma = hwif->autodma;
}
+static int __devinit init_setup_cmd64x(struct pci_dev *dev, ide_pci_device_t *d)
+{
+ return ide_setup_pci_device(dev, d);
+}
+
+static int __devinit init_setup_cmd646(struct pci_dev *dev, ide_pci_device_t *d)
+{
+ u8 rev = 0;
+
+ /*
+ * The original PCI0646 didn't have the primary channel enable bit,
+ * it appeared starting with PCI0646U (i.e. revision ID 3).
+ */
+ pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
+ if (rev < 3)
+ d->enablebits[0].reg = 0;
+
+ return ide_setup_pci_device(dev, d);
+}
+
static ide_pci_device_t cmd64x_chipsets[] __devinitdata = {
{ /* 0 */
.name = "CMD643",
+ .init_setup = init_setup_cmd64x,
.init_chipset = init_chipset_cmd64x,
.init_hwif = init_hwif_cmd64x,
.channels = 2,
.autodma = AUTODMA,
+ .enablebits = {{0x00,0x00,0x00}, {0x51,0x08,0x08}},
.bootable = ON_BOARD,
},{ /* 1 */
.name = "CMD646",
+ .init_setup = init_setup_cmd646,
.init_chipset = init_chipset_cmd64x,
.init_hwif = init_hwif_cmd64x,
.channels = 2,
.autodma = AUTODMA,
- .enablebits = {{0x00,0x00,0x00}, {0x51,0x80,0x80}},
+ .enablebits = {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
.bootable = ON_BOARD,
},{ /* 2 */
.name = "CMD648",
+ .init_setup = init_setup_cmd64x,
.init_chipset = init_chipset_cmd64x,
.init_hwif = init_hwif_cmd64x,
.channels = 2,
.autodma = AUTODMA,
+ .enablebits = {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
.bootable = ON_BOARD,
},{ /* 3 */
.name = "CMD649",
+ .init_setup = init_setup_cmd64x,
.init_chipset = init_chipset_cmd64x,
.init_hwif = init_hwif_cmd64x,
.channels = 2,
.autodma = AUTODMA,
+ .enablebits = {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
.bootable = ON_BOARD,
}
};
+/*
+ * We may have to modify enablebits for PCI0646, so we'd better pass
+ * a local copy of the ide_pci_device_t structure down the call chain...
+ */
static int __devinit cmd64x_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
- return ide_setup_pci_device(dev, &cmd64x_chipsets[id->driver_data]);
+ ide_pci_device_t d = cmd64x_chipsets[id->driver_data];
+
+ return d.init_setup(dev, &d);
}
static struct pci_device_id cmd64x_pci_tbl[] = {
-
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