[POWERPC] Support for "weird" MPICs and fixup mpc7448_hpc2

This adds a new hardware information table for mpic. This enables
the mpic code to deal with mpic controllers with different register
layouts and hardware behaviours.

This introduces CONFIG_MPIC_WEIRD.  For boards with non standard mpic
controllers, select CONFIG_MPIC_WEIRD and add its hardware information
in the mpic_infos[] array.

TSI108/109 PIC takes the first index of weird hardware information
table.  :)  The table can be extended. The Tsi108/109 PIC looks like
standard OpenPIC but, in fact, is different in register mapping and
behavior.

The patch does not affect the behavior of standard mpic.  If
CONFIG_MPIC_WEIRD is not defined, the code is essentially identical to
the current code.

[benh@kernel.crashing.org:
This patch is a slightly cleaned up version of Zang Roy's support for
the TSI108 MPIC variant. It also fixes up MPC7448_hpc2 to use the new
version of the type macros and changes the way MPIC is selected in
Kconfig to better match what is done for other system devices.
]

Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 125 insertions, 0 deletions

diff --git a/include/asm-powerpc/mpic.h b/include/asm-powerpc/mpic.h
index eb241c99c457..a9f9604b9eff 100644
--- a/include/asm-powerpc/mpic.h
+++ b/include/asm-powerpc/mpic.h
@@ -41,6 +41,7 @@
 #define MPIC_GREG_IPI_VECTOR_PRI_1      0x000b0
 #define MPIC_GREG_IPI_VECTOR_PRI_2      0x000c0
 #define MPIC_GREG_IPI_VECTOR_PRI_3      0x000d0
+#define MPIC_GREG_IPI_STRIDE            0x10
 #define MPIC_GREG_SPURIOUS              0x000e0
 #define MPIC_GREG_TIMER_FREQ            0x000f0
 
@@ -68,6 +69,7 @@
 #define MPIC_CPU_IPI_DISPATCH_1         0x00050
 #define MPIC_CPU_IPI_DISPATCH_2         0x00060
 #define MPIC_CPU_IPI_DISPATCH_3         0x00070
+#define MPIC_CPU_IPI_DISPATCH_STRIDE    0x00010
 #define MPIC_CPU_CURRENT_TASK_PRI       0x00080
 #define         MPIC_CPU_TASKPRI_MASK                   0x0000000f
 #define MPIC_CPU_WHOAMI                 0x00090
@@ -114,6 +116,103 @@
 #define MPIC_VEC_TIMER_1        248
 #define MPIC_VEC_TIMER_0        247
 
+/*
+ * Tsi108 implementation of MPIC has many differences from the original one
+ */
+
+/*
+ * Global registers
+ */
+
+#define TSI108_GREG_BASE                0x00000
+#define TSI108_GREG_FEATURE_0           0x00000
+#define TSI108_GREG_GLOBAL_CONF_0       0x00004
+#define TSI108_GREG_VENDOR_ID           0x0000c
+#define TSI108_GREG_IPI_VECTOR_PRI_0    0x00204         /* Doorbell 0 */
+#define TSI108_GREG_IPI_STRIDE          0x0c
+#define TSI108_GREG_SPURIOUS            0x00010
+#define TSI108_GREG_TIMER_FREQ          0x00014
+
+/*
+ * Timer registers
+ */
+#define TSI108_TIMER_BASE               0x0030
+#define TSI108_TIMER_STRIDE             0x10
+#define TSI108_TIMER_CURRENT_CNT        0x00000
+#define TSI108_TIMER_BASE_CNT           0x00004
+#define TSI108_TIMER_VECTOR_PRI         0x00008
+#define TSI108_TIMER_DESTINATION        0x0000c
+
+/*
+ * Per-Processor registers
+ */
+#define TSI108_CPU_BASE                 0x00300
+#define TSI108_CPU_STRIDE               0x00040
+#define TSI108_CPU_IPI_DISPATCH_0       0x00200
+#define TSI108_CPU_IPI_DISPATCH_STRIDE  0x00000
+#define TSI108_CPU_CURRENT_TASK_PRI     0x00000
+#define TSI108_CPU_WHOAMI               0xffffffff
+#define TSI108_CPU_INTACK               0x00004
+#define TSI108_CPU_EOI                  0x00008
+
+/*
+ * Per-source registers
+ */
+#define TSI108_IRQ_BASE                 0x00100
+#define TSI108_IRQ_STRIDE               0x00008
+#define TSI108_IRQ_VECTOR_PRI           0x00000
+#define TSI108_VECPRI_VECTOR_MASK       0x000000ff
+#define TSI108_VECPRI_POLARITY_POSITIVE 0x01000000
+#define TSI108_VECPRI_POLARITY_NEGATIVE 0x00000000
+#define TSI108_VECPRI_SENSE_LEVEL       0x02000000
+#define TSI108_VECPRI_SENSE_EDGE        0x00000000
+#define TSI108_VECPRI_POLARITY_MASK     0x01000000
+#define TSI108_VECPRI_SENSE_MASK        0x02000000
+#define TSI108_IRQ_DESTINATION          0x00004
+
+/* weird mpic register indices and mask bits in the HW info array */
+enum {
+        MPIC_IDX_GREG_BASE = 0,
+        MPIC_IDX_GREG_FEATURE_0,
+        MPIC_IDX_GREG_GLOBAL_CONF_0,
+        MPIC_IDX_GREG_VENDOR_ID,
+        MPIC_IDX_GREG_IPI_VECTOR_PRI_0,
+        MPIC_IDX_GREG_IPI_STRIDE,
+        MPIC_IDX_GREG_SPURIOUS,
+        MPIC_IDX_GREG_TIMER_FREQ,
+
+        MPIC_IDX_TIMER_BASE,
+        MPIC_IDX_TIMER_STRIDE,
+        MPIC_IDX_TIMER_CURRENT_CNT,
+        MPIC_IDX_TIMER_BASE_CNT,
+        MPIC_IDX_TIMER_VECTOR_PRI,
+        MPIC_IDX_TIMER_DESTINATION,
+
+        MPIC_IDX_CPU_BASE,
+        MPIC_IDX_CPU_STRIDE,
+        MPIC_IDX_CPU_IPI_DISPATCH_0,
+        MPIC_IDX_CPU_IPI_DISPATCH_STRIDE,
+        MPIC_IDX_CPU_CURRENT_TASK_PRI,
+        MPIC_IDX_CPU_WHOAMI,
+        MPIC_IDX_CPU_INTACK,
+        MPIC_IDX_CPU_EOI,
+
+        MPIC_IDX_IRQ_BASE,
+        MPIC_IDX_IRQ_STRIDE,
+        MPIC_IDX_IRQ_VECTOR_PRI,
+
+        MPIC_IDX_VECPRI_VECTOR_MASK,
+        MPIC_IDX_VECPRI_POLARITY_POSITIVE,
+        MPIC_IDX_VECPRI_POLARITY_NEGATIVE,
+        MPIC_IDX_VECPRI_SENSE_LEVEL,
+        MPIC_IDX_VECPRI_SENSE_EDGE,
+        MPIC_IDX_VECPRI_POLARITY_MASK,
+        MPIC_IDX_VECPRI_SENSE_MASK,
+        MPIC_IDX_IRQ_DESTINATION,
+        MPIC_IDX_END
+};
+
+
 #ifdef CONFIG_MPIC_BROKEN_U3
 /* Fixup table entry */
 struct mpic_irq_fixup
@@ -171,15 +270,29 @@ struct mpic
         volatile u32 __iomem    *cpuregs[MPIC_MAX_CPUS];
         volatile u32 __iomem    *isus[MPIC_MAX_ISU];
 
+#ifdef CONFIG_MPIC_WEIRD
+        /* Pointer to HW info array */
+        u32                     *hw_set;
+#endif
+
         /* link */
         struct mpic             *next;
 };
 
+/*
+ * MPIC flags (passed to mpic_alloc)
+ *
+ * The top 4 bits contain an MPIC bhw id that is used to index the
+ * register offsets and some masks when CONFIG_MPIC_WEIRD is set.
+ * Note setting any ID (leaving those bits to 0) means standard MPIC
+ */
+
 /* This is the primary controller, only that one has IPIs and
  * has afinity control. A non-primary MPIC always uses CPU0
  * registers only
  */
 #define MPIC_PRIMARY                    0x00000001
+
 /* Set this for a big-endian MPIC */
 #define MPIC_BIG_ENDIAN                 0x00000002
 /* Broken U3 MPIC */
@@ -188,6 +301,18 @@ struct mpic
 #define MPIC_BROKEN_IPI                 0x00000008
 /* MPIC wants a reset */
 #define MPIC_WANTS_RESET                0x00000010
+/* Spurious vector requires EOI */
+#define MPIC_SPV_EOI                    0x00000020
+/* No passthrough disable */
+#define MPIC_NO_PTHROU_DIS              0x00000040
+
+/* MPIC HW modification ID */
+#define MPIC_REGSET_MASK                0xf0000000
+#define MPIC_REGSET(val)                (((val) & 0xf ) << 28)
+#define MPIC_GET_REGSET(flags)          (((flags) >> 28) & 0xf)
+
+#define MPIC_REGSET_STANDARD            MPIC_REGSET(0)  /* Original MPIC */
+#define MPIC_REGSET_TSI108              MPIC_REGSET(1)  /* Tsi108/109 PIC */
 
 /* Allocate the controller structure and setup the linux irq descs
  * for the range if interrupts passed in. No HW initialization is