ssb: Add support for 8bit register access

This adds support for 8bit wide register reads/writes.
This is needed in order to support the gigabit ethernet core.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/ssb/pci.c b/drivers/ssb/pci.c
index b434df75047..1facc7620fc 100644
--- a/drivers/ssb/pci.c
+++ b/drivers/ssb/pci.c
@@ -572,6 +572,19 @@ static inline int ssb_pci_assert_buspower(struct ssb_bus *bus)
 }
 #endif /* DEBUG */
 
+static u8 ssb_pci_read8(struct ssb_device *dev, u16 offset)
+{
+        struct ssb_bus *bus = dev->bus;
+
+        if (unlikely(ssb_pci_assert_buspower(bus)))
+                return 0xFF;
+        if (unlikely(bus->mapped_device != dev)) {
+                if (unlikely(ssb_pci_switch_core(bus, dev)))
+                        return 0xFF;
+        }
+        return ioread8(bus->mmio + offset);
+}
+
 static u16 ssb_pci_read16(struct ssb_device *dev, u16 offset)
 {
         struct ssb_bus *bus = dev->bus;
@@ -598,6 +611,19 @@ static u32 ssb_pci_read32(struct ssb_device *dev, u16 offset)
         return ioread32(bus->mmio + offset);
 }
 
+static void ssb_pci_write8(struct ssb_device *dev, u16 offset, u8 value)
+{
+        struct ssb_bus *bus = dev->bus;
+
+        if (unlikely(ssb_pci_assert_buspower(bus)))
+                return;
+        if (unlikely(bus->mapped_device != dev)) {
+                if (unlikely(ssb_pci_switch_core(bus, dev)))
+                        return;
+        }
+        iowrite8(value, bus->mmio + offset);
+}
+
 static void ssb_pci_write16(struct ssb_device *dev, u16 offset, u16 value)
 {
         struct ssb_bus *bus = dev->bus;
@@ -626,8 +652,10 @@ static void ssb_pci_write32(struct ssb_device *dev, u16 offset, u32 value)
 
 /* Not "static", as it's used in main.c */
 const struct ssb_bus_ops ssb_pci_ops = {
+        .read8          = ssb_pci_read8,
         .read16         = ssb_pci_read16,
         .read32         = ssb_pci_read32,
+        .write8         = ssb_pci_write8,
         .write16        = ssb_pci_write16,
         .write32        = ssb_pci_write32,
 };