Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm

[pandora-kernel.git] / arch / sparc / kernel / sun4m_irq.c

diff --git a/arch/sparc/kernel/sun4m_irq.c b/arch/sparc/kernel/sun4m_irq.c
index a654c16..b92d6d2 100644 (file)
--- a/arch/sparc/kernel/sun4m_irq.c
+++ b/arch/sparc/kernel/sun4m_irq.c
@@ -38,11 +38,85 @@
 #include <asm/sbus.h>
 #include <asm/cacheflush.h>
 
+#include "irq.h"
+
+/* On the sun4m, just like the timers, we have both per-cpu and master
+ * interrupt registers.
+ */
+
+/* These registers are used for sending/receiving irqs from/to
+ * different cpu's.
+ */
+struct sun4m_intreg_percpu {
+       unsigned int tbt;        /* Interrupts still pending for this cpu. */
+
+       /* These next two registers are WRITE-ONLY and are only
+        * "on bit" sensitive, "off bits" written have NO affect.
+        */
+       unsigned int clear;  /* Clear this cpus irqs here. */
+       unsigned int set;    /* Set this cpus irqs here. */
+       unsigned char space[PAGE_SIZE - 12];
+};
+
+/*
+ * djhr
+ * Actually the clear and set fields in this struct are misleading..
+ * according to the SLAVIO manual (and the same applies for the SEC)
+ * the clear field clears bits in the mask which will ENABLE that IRQ
+ * the set field sets bits in the mask to DISABLE the IRQ.
+ *
+ * Also the undirected_xx address in the SLAVIO is defined as
+ * RESERVED and write only..
+ *
+ * DAVEM_NOTE: The SLAVIO only specifies behavior on uniprocessor
+ *             sun4m machines, for MP the layout makes more sense.
+ */
+struct sun4m_intregs {
+       struct sun4m_intreg_percpu cpu_intregs[SUN4M_NCPUS];
+       unsigned int tbt;                /* IRQ's that are still pending. */
+       unsigned int irqs;               /* Master IRQ bits. */
+
+       /* Again, like the above, two these registers are WRITE-ONLY. */
+       unsigned int clear;              /* Clear master IRQ's by setting bits here. */
+       unsigned int set;                /* Set master IRQ's by setting bits here. */
+
+       /* This register is both READ and WRITE. */
+       unsigned int undirected_target;  /* Which cpu gets undirected irqs. */
+};
+
 static unsigned long dummy;
 
 struct sun4m_intregs *sun4m_interrupts;
 unsigned long *irq_rcvreg = &dummy;
 
+/* Dave Redman (djhr@tadpole.co.uk)
+ * The sun4m interrupt registers.
+ */
+#define SUN4M_INT_ENABLE       0x80000000
+#define SUN4M_INT_E14          0x00000080
+#define SUN4M_INT_E10          0x00080000
+
+#define SUN4M_HARD_INT(x)      (0x000000001 << (x))
+#define SUN4M_SOFT_INT(x)      (0x000010000 << (x))
+
+#define        SUN4M_INT_MASKALL       0x80000000        /* mask all interrupts */
+#define        SUN4M_INT_MODULE_ERR    0x40000000        /* module error */
+#define        SUN4M_INT_M2S_WRITE     0x20000000        /* write buffer error */
+#define        SUN4M_INT_ECC           0x10000000        /* ecc memory error */
+#define        SUN4M_INT_FLOPPY        0x00400000        /* floppy disk */
+#define        SUN4M_INT_MODULE        0x00200000        /* module interrupt */
+#define        SUN4M_INT_VIDEO         0x00100000        /* onboard video */
+#define        SUN4M_INT_REALTIME      0x00080000        /* system timer */
+#define        SUN4M_INT_SCSI          0x00040000        /* onboard scsi */
+#define        SUN4M_INT_AUDIO         0x00020000        /* audio/isdn */
+#define        SUN4M_INT_ETHERNET      0x00010000        /* onboard ethernet */
+#define        SUN4M_INT_SERIAL        0x00008000        /* serial ports */
+#define        SUN4M_INT_KBDMS         0x00004000        /* keyboard/mouse */
+#define        SUN4M_INT_SBUSBITS      0x00003F80        /* sbus int bits */
+
+#define SUN4M_INT_SBUS(x)      (1 << (x+7))
+#define SUN4M_INT_VME(x)       (1 << (x))
+
 /* These tables only apply for interrupts greater than 15..
  * 
  * any intr value below 0x10 is considered to be a soft-int
@@ -299,7 +373,7 @@ static void __init sun4m_init_timers(irq_handler_t counter_fn)
                struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
 
                /* For SMP we use the level 14 ticker, however the bootup code
-                * has copied the firmwares level 14 vector into boot cpu's
+                * has copied the firmware's level 14 vector into the boot cpu's
                 * trap table, we must fix this now or we get squashed.
                 */
                local_irq_save(flags);