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-rw-r--r--target/linux/pxcab/patches-2.6.30/0001-powerpc-mpic-Fix-mapping-of-DCR-based-MPIC-variants.patch107
1 files changed, 107 insertions, 0 deletions
diff --git a/target/linux/pxcab/patches-2.6.30/0001-powerpc-mpic-Fix-mapping-of-DCR-based-MPIC-variants.patch b/target/linux/pxcab/patches-2.6.30/0001-powerpc-mpic-Fix-mapping-of-DCR-based-MPIC-variants.patch
new file mode 100644
index 0000000000..c546919279
--- /dev/null
+++ b/target/linux/pxcab/patches-2.6.30/0001-powerpc-mpic-Fix-mapping-of-DCR-based-MPIC-variants.patch
@@ -0,0 +1,107 @@
+commit 5a2642f620eb6e40792822fa0eafe23046fbb55e
+Author: Benjamin Herrenschmidt <benh@kernel.crashing.org>
+Date: Mon Jun 22 16:47:59 2009 +0000
+
+ powerpc/mpic: Fix mapping of "DCR" based MPIC variants
+
+ Commit 31207dab7d2e63795eb15823947bd2f7025b08e2
+ "Fix incorrect allocation of interrupt rev-map"
+ introduced a regression crashing on boot on machines using
+ a "DCR" based MPIC, such as the Cell blades.
+
+ The reason is that the irq host data structure is initialized
+ much later as a result of that patch, causing our calls to
+ mpic_map() do be done before we have a host setup.
+
+ Unfortunately, this breaks _mpic_map_dcr() which uses the
+ mpic->irqhost to get to the device node.
+
+ This fixes it by, instead, passing the device node explicitely
+ to mpic_map().
+
+ Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
+ Acked-by: Akira Tsukamoto <akirat@rd.scei.sony.co.jp>
+
+diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
+index 9c3af50..32a2e95 100644
+--- a/arch/powerpc/sysdev/mpic.c
++++ b/arch/powerpc/sysdev/mpic.c
+@@ -279,28 +279,29 @@ static void _mpic_map_mmio(struct mpic *mpic, phys_addr_t phys_addr,
+ }
+
+ #ifdef CONFIG_PPC_DCR
+-static void _mpic_map_dcr(struct mpic *mpic, struct mpic_reg_bank *rb,
++static void _mpic_map_dcr(struct mpic *mpic, struct device_node *node,
++ struct mpic_reg_bank *rb,
+ unsigned int offset, unsigned int size)
+ {
+ const u32 *dbasep;
+
+- dbasep = of_get_property(mpic->irqhost->of_node, "dcr-reg", NULL);
++ dbasep = of_get_property(node, "dcr-reg", NULL);
+
+- rb->dhost = dcr_map(mpic->irqhost->of_node, *dbasep + offset, size);
++ rb->dhost = dcr_map(node, *dbasep + offset, size);
+ BUG_ON(!DCR_MAP_OK(rb->dhost));
+ }
+
+-static inline void mpic_map(struct mpic *mpic, phys_addr_t phys_addr,
+- struct mpic_reg_bank *rb, unsigned int offset,
+- unsigned int size)
++static inline void mpic_map(struct mpic *mpic, struct device_node *node,
++ phys_addr_t phys_addr, struct mpic_reg_bank *rb,
++ unsigned int offset, unsigned int size)
+ {
+ if (mpic->flags & MPIC_USES_DCR)
+- _mpic_map_dcr(mpic, rb, offset, size);
++ _mpic_map_dcr(mpic, node, rb, offset, size);
+ else
+ _mpic_map_mmio(mpic, phys_addr, rb, offset, size);
+ }
+ #else /* CONFIG_PPC_DCR */
+-#define mpic_map(m,p,b,o,s) _mpic_map_mmio(m,p,b,o,s)
++#define mpic_map(m,n,p,b,o,s) _mpic_map_mmio(m,p,b,o,s)
+ #endif /* !CONFIG_PPC_DCR */
+
+
+@@ -1152,8 +1153,8 @@ struct mpic * __init mpic_alloc(struct device_node *node,
+ }
+
+ /* Map the global registers */
+- mpic_map(mpic, paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);
+- mpic_map(mpic, paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
++ mpic_map(mpic, node, paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);
++ mpic_map(mpic, node, paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
+
+ /* Reset */
+ if (flags & MPIC_WANTS_RESET) {
+@@ -1194,7 +1195,7 @@ struct mpic * __init mpic_alloc(struct device_node *node,
+
+ /* Map the per-CPU registers */
+ for (i = 0; i < mpic->num_cpus; i++) {
+- mpic_map(mpic, paddr, &mpic->cpuregs[i],
++ mpic_map(mpic, node, paddr, &mpic->cpuregs[i],
+ MPIC_INFO(CPU_BASE) + i * MPIC_INFO(CPU_STRIDE),
+ 0x1000);
+ }
+@@ -1202,7 +1203,7 @@ struct mpic * __init mpic_alloc(struct device_node *node,
+ /* Initialize main ISU if none provided */
+ if (mpic->isu_size == 0) {
+ mpic->isu_size = mpic->num_sources;
+- mpic_map(mpic, paddr, &mpic->isus[0],
++ mpic_map(mpic, node, paddr, &mpic->isus[0],
+ MPIC_INFO(IRQ_BASE), MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
+ }
+ mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
+@@ -1256,8 +1257,10 @@ void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
+
+ BUG_ON(isu_num >= MPIC_MAX_ISU);
+
+- mpic_map(mpic, paddr, &mpic->isus[isu_num], 0,
++ mpic_map(mpic, mpic->irqhost->of_node,
++ paddr, &mpic->isus[isu_num], 0,
+ MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
++
+ if ((isu_first + mpic->isu_size) > mpic->num_sources)
+ mpic->num_sources = isu_first + mpic->isu_size;
+ }