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, 32 insertions, 0 deletions

diff --git a/drivers/ssb/pcmcia.c b/drivers/ssb/pcmcia.c
index 46816cda8b98..84b3a845a8a8 100644
--- a/drivers/ssb/pcmcia.c
+++ b/drivers/ssb/pcmcia.c
@@ -172,6 +172,22 @@ static int select_core_and_segment(struct ssb_device *dev,
         return 0;
 }
 
+static u8 ssb_pcmcia_read8(struct ssb_device *dev, u16 offset)
+{
+        struct ssb_bus *bus = dev->bus;
+        unsigned long flags;
+        int err;
+        u8 value = 0xFF;
+
+        spin_lock_irqsave(&bus->bar_lock, flags);
+        err = select_core_and_segment(dev, &offset);
+        if (likely(!err))
+                value = readb(bus->mmio + offset);
+        spin_unlock_irqrestore(&bus->bar_lock, flags);
+
+        return value;
+}
+
 static u16 ssb_pcmcia_read16(struct ssb_device *dev, u16 offset)
 {
         struct ssb_bus *bus = dev->bus;
@@ -206,6 +222,20 @@ static u32 ssb_pcmcia_read32(struct ssb_device *dev, u16 offset)
         return (lo | (hi << 16));
 }
 
+static void ssb_pcmcia_write8(struct ssb_device *dev, u16 offset, u8 value)
+{
+        struct ssb_bus *bus = dev->bus;
+        unsigned long flags;
+        int err;
+
+        spin_lock_irqsave(&bus->bar_lock, flags);
+        err = select_core_and_segment(dev, &offset);
+        if (likely(!err))
+                writeb(value, bus->mmio + offset);
+        mmiowb();
+        spin_unlock_irqrestore(&bus->bar_lock, flags);
+}
+
 static void ssb_pcmcia_write16(struct ssb_device *dev, u16 offset, u16 value)
 {
         struct ssb_bus *bus = dev->bus;
@@ -238,8 +268,10 @@ static void ssb_pcmcia_write32(struct ssb_device *dev, u16 offset, u32 value)
 
 /* Not "static", as it's used in main.c */
 const struct ssb_bus_ops ssb_pcmcia_ops = {
+        .read8          = ssb_pcmcia_read8,
         .read16         = ssb_pcmcia_read16,
         .read32         = ssb_pcmcia_read32,
+        .write8         = ssb_pcmcia_write8,
         .write16        = ssb_pcmcia_write16,
         .write32        = ssb_pcmcia_write32,
 };