--- /dev/null
+the current ssb irq setup (in ssb_mipscore_init) have some problem :
+it configure some device on some irq without checking that the irq is not taken by an other device.
+
+For example in my case PCI host is on irq 0 and IPSEC on irq 3.
+The current code :
+- store in dev->irq that IPSEC irq is 3+2
+- do a set_irq 0->3 on PCI host
+
+But now IPSEC irq is not routed anymore to the mips code and dev->irq is wrong. This cause problem described in [1].
+
+This patch try to solve the problem by making set_irq configure the device we want to take the irq on the shared irq0.
+The previous example become :
+- store in dev->irq that IPSEC irq is 3+2
+- do a set_irq 0->3 on PCI host :
+ - irq 3 is already taken by IPSEC. do a set_irq 3->0 on IPSEC
+
+
+I also added some code to print the irq configuration before and after irq setup to allow easier debugging. And I add extra checking in ssb_mips_irq to report device without irq or device with not routed irq.
+
+
+[1] http://www.danm.de/files/src/bcm5365p/REPORTED_DEVICES
+
+Signed-off-by: Matthieu CASTET <castet.matthieu@free.fr>
+Index: linux-2.6/drivers/ssb/driver_mipscore.c
+===================================================================
+--- linux-2.6.orig/drivers/ssb/driver_mipscore.c 2009-05-25 19:47:26.000000000 +0200
++++ linux-2.6/drivers/ssb/driver_mipscore.c 2009-05-25 19:47:42.000000000 +0200
+@@ -49,29 +49,54 @@
+
+ static inline u32 ssb_irqflag(struct ssb_device *dev)
+ {
+- return ssb_read32(dev, SSB_TPSFLAG) & SSB_TPSFLAG_BPFLAG;
++ u32 tpsflag = ssb_read32(dev, SSB_TPSFLAG);
++ if (tpsflag)
++ return ssb_read32(dev, SSB_TPSFLAG) & SSB_TPSFLAG_BPFLAG;
++ else
++ /* not irq supported */
++ return 0x3f;
++}
++
++static struct ssb_device *find_device(struct ssb_device *rdev, int irqflag)
++{
++ struct ssb_bus *bus = rdev->bus;
++ int i;
++ for (i = 0; i < bus->nr_devices; i++) {
++ struct ssb_device *dev;
++ dev = &(bus->devices[i]);
++ if (ssb_irqflag(dev) == irqflag)
++ return dev;
++ }
++ return NULL;
+ }
+
+ /* Get the MIPS IRQ assignment for a specified device.
+ * If unassigned, 0 is returned.
++ * If disabled, 5 is returned.
++ * If not supported, 6 is returned.
+ */
+ unsigned int ssb_mips_irq(struct ssb_device *dev)
+ {
+ struct ssb_bus *bus = dev->bus;
++ struct ssb_device *mdev = bus->mipscore.dev;
+ u32 irqflag;
+ u32 ipsflag;
+ u32 tmp;
+ unsigned int irq;
+
+ irqflag = ssb_irqflag(dev);
++ if (irqflag == 0x3f)
++ return 6;
+ ipsflag = ssb_read32(bus->mipscore.dev, SSB_IPSFLAG);
+ for (irq = 1; irq <= 4; irq++) {
+ tmp = ((ipsflag & ipsflag_irq_mask[irq]) >> ipsflag_irq_shift[irq]);
+ if (tmp == irqflag)
+ break;
+ }
+- if (irq == 5)
+- irq = 0;
++ if (irq == 5) {
++ if ((1 << irqflag) & ssb_read32(mdev, SSB_INTVEC))
++ irq = 0;
++ }
+
+ return irq;
+ }
+@@ -97,25 +122,56 @@
+ struct ssb_device *mdev = bus->mipscore.dev;
+ u32 irqflag = ssb_irqflag(dev);
+
++ BUG_ON(oldirq == 6);
++
+ dev->irq = irq + 2;
+
+- ssb_dprintk(KERN_INFO PFX
+- "set_irq: core 0x%04x, irq %d => %d\n",
+- dev->id.coreid, oldirq, irq);
+ /* clear the old irq */
+ if (oldirq == 0)
+ ssb_write32(mdev, SSB_INTVEC, (~(1 << irqflag) & ssb_read32(mdev, SSB_INTVEC)));
+- else
++ else if (oldirq != 5)
+ clear_irq(bus, oldirq);
+
+ /* assign the new one */
+ if (irq == 0) {
+ ssb_write32(mdev, SSB_INTVEC, ((1 << irqflag) | ssb_read32(mdev, SSB_INTVEC)));
+ } else {
++ u32 ipsflag = ssb_read32(mdev, SSB_IPSFLAG);
++ if ((ipsflag & ipsflag_irq_mask[irq]) != ipsflag_irq_mask[irq]) {
++ u32 oldipsflag = (ipsflag & ipsflag_irq_mask[irq]) >> ipsflag_irq_shift[irq];
++ struct ssb_device *olddev = find_device(dev, oldipsflag);
++ if (olddev)
++ set_irq(olddev, 0);
++ }
+ irqflag <<= ipsflag_irq_shift[irq];
+- irqflag |= (ssb_read32(mdev, SSB_IPSFLAG) & ~ipsflag_irq_mask[irq]);
++ irqflag |= (ipsflag & ~ipsflag_irq_mask[irq]);
+ ssb_write32(mdev, SSB_IPSFLAG, irqflag);
+ }
++ ssb_dprintk(KERN_INFO PFX
++ "set_irq: core 0x%04x, irq %d => %d\n",
++ dev->id.coreid, oldirq+2, irq+2);
++}
++
++static void print_irq(struct ssb_device *dev, unsigned int irq)
++{
++ int i;
++ static const char *irq_name[] = {"2(S)", "3", "4", "5", "6", "D", "I"};
++ ssb_dprintk(KERN_INFO PFX
++ "core 0x%04x, irq :", dev->id.coreid);
++ for (i = 0; i <= 6; i++) {
++ ssb_dprintk(" %s%s", irq_name[i], i==irq?"*":" ");
++ }
++ ssb_dprintk("\n");
++}
++
++static void dump_irq(struct ssb_bus *bus)
++{
++ int i;
++ for (i = 0; i < bus->nr_devices; i++) {
++ struct ssb_device *dev;
++ dev = &(bus->devices[i]);
++ print_irq(dev, ssb_mips_irq(dev));
++ }
+ }
+
+ static void ssb_mips_serial_init(struct ssb_mipscore *mcore)
+@@ -195,18 +251,26 @@
+ else if (bus->chipco.dev)
+ ssb_chipco_timing_init(&bus->chipco, ns);
+
++ dump_irq(bus);
+ /* Assign IRQs to all cores on the bus, start with irq line 2, because serial usually takes 1 */
+ for (irq = 2, i = 0; i < bus->nr_devices; i++) {
++ int mips_irq;
+ dev = &(bus->devices[i]);
+- dev->irq = ssb_mips_irq(dev) + 2;
++ mips_irq = ssb_mips_irq(dev);
++ if (mips_irq > 4)
++ dev->irq = 0;
++ else
++ dev->irq = mips_irq + 2;
++ if (dev->irq > 5)
++ continue;
+ switch (dev->id.coreid) {
+ case SSB_DEV_USB11_HOST:
+ /* shouldn't need a separate irq line for non-4710, most of them have a proper
+ * external usb controller on the pci */
+ if ((bus->chip_id == 0x4710) && (irq <= 4)) {
+ set_irq(dev, irq++);
+- break;
+ }
++ break;
+ /* fallthrough */
+ case SSB_DEV_PCI:
+ case SSB_DEV_ETHERNET:
+@@ -220,6 +284,8 @@
+ }
+ }
+ }
++ ssb_dprintk(KERN_INFO PFX "after irq reconfiguration\n");
++ dump_irq(bus);
+
+ ssb_mips_serial_init(mcore);
+ ssb_mips_flash_detect(mcore);
projects / openwrt / staging / lynxis.git / commitdiff