firewire: fw-ohci: PPC PMac platform code

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>

1 files changed, 49 insertions, 0 deletions

diff --git a/drivers/firewire/fw-ohci.c b/drivers/firewire/fw-ohci.c
index f9440a760da..182be8672df 100644
--- a/drivers/firewire/fw-ohci.c
+++ b/drivers/firewire/fw-ohci.c
@@ -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);