[POWERPC] Cell interrupt rework

This patch reworks the cell iic interrupt handling so that:

 - Node ID is back in the interrupt number (only one IRQ host is created
for all nodes). This allows interrupts from sources on another node to
be routed non-locally. This will allow possibly one day to fix maxcpus=1
or 2 and still get interrupts from devices on BE 1. (A bit more fixing
is needed for that) and it will allow us to implement actual affinity
control of external interrupts.

 - Added handling of the IO exceptions interrupts (badly named, but I
re-used the name initially used by STI). Those are the interrupts
exposed by IIC_ISR and IIC_IRR, such as the IOC translation exception,
performance monitor, etc... Those get their special numbers in the IRQ
number space and are internally implemented as a cascade on unit 0xe,
class 1 of each node.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 62 insertions, 35 deletions

diff --git a/arch/powerpc/platforms/cell/interrupt.h b/arch/powerpc/platforms/cell/interrupt.h
index 5560a92ec3ab..9ba1d3c17b4b 100644
--- a/arch/powerpc/platforms/cell/interrupt.h
+++ b/arch/powerpc/platforms/cell/interrupt.h
@@ -2,48 +2,76 @@
 #define ASM_CELL_PIC_H
 #ifdef __KERNEL__
 /*
- * Mapping of IIC pending bits into per-node
- * interrupt numbers.
+ * Mapping of IIC pending bits into per-node interrupt numbers.
  *
- * IRQ     FF CC SS PP   FF CC SS PP    Description
+ * Interrupt numbers are in the range 0...0x1ff where the top bit
+ * (0x100) represent the source node. Only 2 nodes are supported with
+ * the current code though it's trivial to extend that if necessary using
+ * higher level bits
  *
- * 00-3f   80 02 +0 00 - 80 02 +0 3f    South Bridge
- * 00-3f   80 02 +b 00 - 80 02 +b 3f    South Bridge
- * 41-4a   80 00 +1 ** - 80 00 +a **    SPU Class 0
- * 51-5a   80 01 +1 ** - 80 01 +a **    SPU Class 1
- * 61-6a   80 02 +1 ** - 80 02 +a **    SPU Class 2
- * 70-7f   C0 ** ** 00 - C0 ** ** 0f    IPI
+ * The bottom 8 bits are split into 2 type bits and 6 data bits that
+ * depend on the type:
  *
- *    F flags
- *    C class
- *    S source
- *    P Priority
- *    + node number
- *    * don't care
+ * 00 (0x00 | data) : normal interrupt. data is (class << 4) | source
+ * 01 (0x40 | data) : IO exception. data is the exception number as
+ *                    defined by bit numbers in IIC_SR
+ * 10 (0x80 | data) : IPI. data is the IPI number (obtained from the priority)
+ *                    and node is always 0 (IPIs are per-cpu, their source is
+ *                    not relevant)
+ * 11 (0xc0 | data) : reserved
  *
- * A node consists of a Cell Broadband Engine and an optional
- * south bridge device providing a maximum of 64 IRQs.
- * The south bridge may be connected to either IOIF0
- * or IOIF1.
- * Each SPE is represented as three IRQ lines, one per
- * interrupt class.
- * 16 IRQ numbers are reserved for inter processor
- * interruptions, although these are only used in the
- * range of the first node.
+ * In addition, interrupt number 0x80000000 is defined as always invalid
+ * (that is the node field is expected to never extend to move than 23 bits)
  *
- * This scheme needs 128 IRQ numbers per BIF node ID,
- * which means that with the total of 512 lines
- * available, we can have a maximum of four nodes.
  */
 
 enum {
-        IIC_IRQ_INVALID         = 0xff,
-        IIC_IRQ_MAX             = 0x3f,
-        IIC_IRQ_EXT_IOIF0       = 0x20,
-        IIC_IRQ_EXT_IOIF1       = 0x2b,
-        IIC_IRQ_IPI0            = 0x40,
-        IIC_NUM_IPIS            = 0x10, /* IRQs reserved for IPI */
-        IIC_SOURCE_COUNT        = 0x50,
+        IIC_IRQ_INVALID         = 0x80000000u,
+        IIC_IRQ_NODE_MASK       = 0x100,
+        IIC_IRQ_NODE_SHIFT      = 8,
+        IIC_IRQ_MAX             = 0x1ff,
+        IIC_IRQ_TYPE_MASK       = 0xc0,
+        IIC_IRQ_TYPE_NORMAL     = 0x00,
+        IIC_IRQ_TYPE_IOEXC      = 0x40,
+        IIC_IRQ_TYPE_IPI        = 0x80,
+        IIC_IRQ_CLASS_SHIFT     = 4,
+        IIC_IRQ_CLASS_0         = 0x00,
+        IIC_IRQ_CLASS_1         = 0x10,
+        IIC_IRQ_CLASS_2         = 0x20,
+        IIC_SOURCE_COUNT        = 0x200,
+
+        /* Here are defined the various source/dest units. Avoid using those
+         * definitions if you can, they are mostly here for reference
+         */
+        IIC_UNIT_SPU_0          = 0x4,
+        IIC_UNIT_SPU_1          = 0x7,
+        IIC_UNIT_SPU_2          = 0x3,
+        IIC_UNIT_SPU_3          = 0x8,
+        IIC_UNIT_SPU_4          = 0x2,
+        IIC_UNIT_SPU_5          = 0x9,
+        IIC_UNIT_SPU_6          = 0x1,
+        IIC_UNIT_SPU_7          = 0xa,
+        IIC_UNIT_IOC_0          = 0x0,
+        IIC_UNIT_IOC_1          = 0xb,
+        IIC_UNIT_THREAD_0       = 0xe, /* target only */
+        IIC_UNIT_THREAD_1       = 0xf, /* target only */
+        IIC_UNIT_IIC            = 0xe, /* source only (IO exceptions) */
+
+        /* Base numbers for the external interrupts */
+        IIC_IRQ_EXT_IOIF0       =
+                IIC_IRQ_TYPE_NORMAL | IIC_IRQ_CLASS_2 | IIC_UNIT_IOC_0,
+        IIC_IRQ_EXT_IOIF1       =
+                IIC_IRQ_TYPE_NORMAL | IIC_IRQ_CLASS_2 | IIC_UNIT_IOC_1,
+
+        /* Base numbers for the IIC_ISR interrupts */
+        IIC_IRQ_IOEX_TMI        = IIC_IRQ_TYPE_IOEXC | IIC_IRQ_CLASS_1 | 63,
+        IIC_IRQ_IOEX_PMI        = IIC_IRQ_TYPE_IOEXC | IIC_IRQ_CLASS_1 | 62,
+        IIC_IRQ_IOEX_ATI        = IIC_IRQ_TYPE_IOEXC | IIC_IRQ_CLASS_1 | 61,
+        IIC_IRQ_IOEX_MATBFI     = IIC_IRQ_TYPE_IOEXC | IIC_IRQ_CLASS_1 | 60,
+        IIC_IRQ_IOEX_ELDI       = IIC_IRQ_TYPE_IOEXC | IIC_IRQ_CLASS_1 | 59,
+
+        /* Which bits in IIC_ISR are edge sensitive */
+        IIC_ISR_EDGE_MASK       = 0x4ul,
 };
 
 extern void iic_init_IRQ(void);
@@ -52,7 +80,6 @@ extern void iic_request_IPIs(void);
 extern void iic_setup_cpu(void);
 
 extern u8 iic_get_target_id(int cpu);
-extern struct irq_host *iic_get_irq_host(int node);
 
 extern void spider_init_IRQ(void);