firewire: fw-ohci: Apple UniNorth 1st generation support

Mostly copied from ohci1394.c.  Necessary for some older Macs, e.g.
PowerBook G3 Pismo and early PowerBook G4 Titanium.

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

1 files changed, 21 insertions, 8 deletions

diff --git a/drivers/firewire/fw-ohci.c b/drivers/firewire/fw-ohci.c
index 182be8672dfd..eaa213e21592 100644
--- a/drivers/firewire/fw-ohci.c
+++ b/drivers/firewire/fw-ohci.c
@@ -179,6 +179,7 @@ struct fw_ohci {
         int generation;
         int request_generation;
         u32 bus_seconds;
+        bool old_uninorth;
 
         /*
          * Spinlock for accessing fw_ohci data.  Never call out of
@@ -315,15 +316,22 @@ static int ar_context_add_page(struct ar_context *ctx)
         return 0;
 }
 
+#if defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32)
+#define cond_le32_to_cpu(v) \
+        (ohci->old_uninorth ? (__force __u32)(v) : le32_to_cpu(v))
+#else
+#define cond_le32_to_cpu(v) le32_to_cpu(v)
+#endif
+
 static __le32 *handle_ar_packet(struct ar_context *ctx, __le32 *buffer)
 {
         struct fw_ohci *ohci = ctx->ohci;
         struct fw_packet p;
         u32 status, length, tcode;
 
-        p.header[0] = le32_to_cpu(buffer[0]);
-        p.header[1] = le32_to_cpu(buffer[1]);
-        p.header[2] = le32_to_cpu(buffer[2]);
+        p.header[0] = cond_le32_to_cpu(buffer[0]);
+        p.header[1] = cond_le32_to_cpu(buffer[1]);
+        p.header[2] = cond_le32_to_cpu(buffer[2]);
 
         tcode = (p.header[0] >> 4) & 0x0f;
         switch (tcode) {
@@ -335,7 +343,7 @@ static __le32 *handle_ar_packet(struct ar_context *ctx, __le32 *buffer)
                 break;
 
         case TCODE_READ_BLOCK_REQUEST :
-                p.header[3] = le32_to_cpu(buffer[3]);
+                p.header[3] = cond_le32_to_cpu(buffer[3]);
                 p.header_length = 16;
                 p.payload_length = 0;
                 break;
@@ -344,7 +352,7 @@ static __le32 *handle_ar_packet(struct ar_context *ctx, __le32 *buffer)
         case TCODE_READ_BLOCK_RESPONSE:
         case TCODE_LOCK_REQUEST:
         case TCODE_LOCK_RESPONSE:
-                p.header[3] = le32_to_cpu(buffer[3]);
+                p.header[3] = cond_le32_to_cpu(buffer[3]);
                 p.header_length = 16;
                 p.payload_length = p.header[3] >> 16;
                 break;
@@ -361,7 +369,7 @@ static __le32 *handle_ar_packet(struct ar_context *ctx, __le32 *buffer)
 
         /* FIXME: What to do about evt_* errors? */
         length = (p.header_length + p.payload_length + 3) / 4;
-        status = le32_to_cpu(buffer[length]);
+        status = cond_le32_to_cpu(buffer[length]);
 
         p.ack        = ((status >> 16) & 0x1f) - 16;
         p.speed      = (status >> 21) & 0x7;
@@ -1026,13 +1034,14 @@ static void bus_reset_tasklet(unsigned long data)
          */
 
         self_id_count = (reg_read(ohci, OHCI1394_SelfIDCount) >> 3) & 0x3ff;
-        generation = (le32_to_cpu(ohci->self_id_cpu[0]) >> 16) & 0xff;
+        generation = (cond_le32_to_cpu(ohci->self_id_cpu[0]) >> 16) & 0xff;
         rmb();
 
         for (i = 1, j = 0; j < self_id_count; i += 2, j++) {
                 if (ohci->self_id_cpu[i] != ~ohci->self_id_cpu[i + 1])
                         fw_error("inconsistent self IDs\n");
-                ohci->self_id_buffer[j] = le32_to_cpu(ohci->self_id_cpu[i]);
+                ohci->self_id_buffer[j] =
+                                cond_le32_to_cpu(ohci->self_id_cpu[i]);
         }
         rmb();
 
@@ -2082,6 +2091,10 @@ pci_probe(struct pci_dev *dev, const struct pci_device_id *ent)
         pci_write_config_dword(dev, OHCI1394_PCI_HCI_Control, 0);
         pci_set_drvdata(dev, ohci);
 
+#if defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32)
+        ohci->old_uninorth = dev->vendor == PCI_VENDOR_ID_APPLE &&
+                             dev->device == PCI_DEVICE_ID_APPLE_UNI_N_FW;
+#endif
         spin_lock_init(&ohci->lock);
 
         tasklet_init(&ohci->bus_reset_tasklet,