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firewire: fw-ohci: PPC PMac platform code

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Copied from ohci1394.c.  This code is necessary to prevent machine check
exceptions when reloading or resuming the driver.

Tested on a 1st generation PowerBook G4 Titanium, which also needs the
pci_probe() hunk.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

I was able to reproduce the system exception on resume with a 3rd-gen
Titanium PowerBook G4 667, and this patch does let the system resume
successfully now.

Not quite clear if there was possibly an updated version coming using
pci_enable_device() instead of the pair of pmac_call_feature() calls,
but either way, this is a definite must-have, at least for older ppc
macs -- my Aluminum PowerBook G4/1.67 suspends and resumes without this
patch just fine.

Signed-off-by: Jarod Wilson <jwilson@redhat.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Stefan Richter 2008-03-01 02:42:56 +01:00
parent efbf390a2d
commit ea8d006b91
1 changed files with 49 additions and 0 deletions
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49
drivers/firewire/fw-ohci.c
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@ -33,6 +33,10 @@
#include <asm/page.h>
#include <asm/system.h>
#ifdef CONFIG_PPC_PMAC
#include <asm/pmac_feature.h>
#endif
#include "fw-ohci.h"
#include "fw-transaction.h"
@ -2048,6 +2052,18 @@ pci_probe(struct pci_dev *dev, const struct pci_device_id *ent)
int err;
size_t size;
#ifdef CONFIG_PPC_PMAC
/* Necessary on some machines if fw-ohci was loaded/ unloaded before */
if (machine_is(powermac)) {
struct device_node *ofn = pci_device_to_OF_node(dev);
if (ofn) {
pmac_call_feature(PMAC_FTR_1394_CABLE_POWER, ofn, 0, 1);
pmac_call_feature(PMAC_FTR_1394_ENABLE, ofn, 0, 1);
}
}
#endif /* CONFIG_PPC_PMAC */
ohci = kzalloc(sizeof(*ohci), GFP_KERNEL);
if (ohci == NULL) {
fw_error("Could not malloc fw_ohci data.\n");
@ -2182,6 +2198,19 @@ static void pci_remove(struct pci_dev *dev)
pci_disable_device(dev);
fw_card_put(&ohci->card);
#ifdef CONFIG_PPC_PMAC
/* On UniNorth, power down the cable and turn off the chip clock
* to save power on laptops */
if (machine_is(powermac)) {
struct device_node *ofn = pci_device_to_OF_node(dev);
if (ofn) {
pmac_call_feature(PMAC_FTR_1394_ENABLE, ofn, 0, 0);
pmac_call_feature(PMAC_FTR_1394_CABLE_POWER, ofn, 0, 0);
}
}
#endif /* CONFIG_PPC_PMAC */
fw_notify("Removed fw-ohci device.\n");
}
@ -2202,6 +2231,16 @@ static int pci_suspend(struct pci_dev *pdev, pm_message_t state)
if (err)
fw_error("pci_set_power_state failed with %d\n", err);
/* PowerMac suspend code comes last */
#ifdef CONFIG_PPC_PMAC
if (machine_is(powermac)) {
struct device_node *ofn = pci_device_to_OF_node(pdev);
if (ofn)
pmac_call_feature(PMAC_FTR_1394_ENABLE, ofn, 0, 0);
}
#endif /* CONFIG_PPC_PMAC */
return 0;
}
@ -2210,6 +2249,16 @@ static int pci_resume(struct pci_dev *pdev)
struct fw_ohci *ohci = pci_get_drvdata(pdev);
int err;
/* PowerMac resume code comes first */
#ifdef CONFIG_PPC_PMAC
if (machine_is(powermac)) {
struct device_node *ofn = pci_device_to_OF_node(pdev);
if (ofn)
pmac_call_feature(PMAC_FTR_1394_ENABLE, ofn, 0, 1);
}
#endif /* CONFIG_PPC_PMAC */
pci_set_power_state(pdev, PCI_D0);
pci_restore_state(pdev);
err = pci_enable_device(pdev);