Re: [RFC] AI support (3/14 ssb irqflag mips core op)

[George Kashperko <george@znau.edu.ua>]

From: George Kashperko <george@znau.edu.ua>

SB- and AI-style buses read irq flags from different locations.
SB-ones read them from TPSFLAG whereas AI-ones from core oob register.
In order to support both SB- and AI-style buses transparently
irq flag accessor is implemented as ssb mips core op.
Signed-off-by: George Kashperko <george@znau.edu.ua>
---
 drivers/ssb/driver_mipscore.c       |    6 ++++++
 include/linux/ssb/ssb_driver_mips.h |    3 +++
 2 files changed, 9 insertions(+)
--- linux-wireless-testing.orig/drivers/ssb/driver_mipscore.c	2011-02-08 00:22:45.000000000 +0200
+++ linux-wireless-testing/drivers/ssb/driver_mipscore.c	2011-02-17 14:05:27.000000000 +0200
@@ -49,6 +49,11 @@ static const u32 ipsflag_irq_shift[] = {
 
 static inline u32 ssb_irqflag(struct ssb_device *dev)
 {
+	return dev->bus->mipscore.irqflag(dev);
+}
+
+static u32 ssb_irqflag_sb(struct ssb_device *dev)
+{
 	u32 tpsflag = ssb_read32(dev, SSB_TPSFLAG);
 	if (tpsflag)
 		return ssb_read32(dev, SSB_TPSFLAG) & SSB_TPSFLAG_BPFLAG;
@@ -241,6 +246,7 @@ void ssb_mipscore_init(struct ssb_mipsco
 	ssb_dprintk(KERN_INFO PFX "Initializing MIPS core...\n");
 
 	bus = mcore->dev->bus;
+	bus->mipscore.irqflag = ssb_irqflag_sb;
 	hz = ssb_clockspeed(bus);
 	if (!hz)
 		hz = 100000000;
--- linux-wireless-testing.orig/include/linux/ssb/ssb_driver_mips.h	2011-02-08 00:22:50.000000000 +0200
+++ linux-wireless-testing/include/linux/ssb/ssb_driver_mips.h	2011-02-17 14:05:27.000000000 +0200
@@ -23,6 +23,9 @@ struct ssb_mipscore {
 	u8 flash_buswidth;
 	u32 flash_window;
 	u32 flash_window_size;
+
+	/* mips core implementation-specific irq flag helper */
+	u32 (*irqflag)(struct ssb_device *dev);
 };
 
 extern void ssb_mipscore_init(struct ssb_mipscore *mcore);