sh: intc - add single bitmap register support

This patch adds single bitmap register support to intc. The current
code only handles 16 and 32 bit registers where a set bit means
interrupt enabled, but this is easy to extend in the future.

The INTC_IRQ() macro is also added to provide a way to hook in
interrupt controllers for FPGAs in boards or companion chips.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 62 insertions, 11 deletions

diff --git a/arch/sh/kernel/cpu/irq/intc.c b/arch/sh/kernel/cpu/irq/intc.c
index 9345a7130e9e..a25f70dd6ad7 100644
--- a/arch/sh/kernel/cpu/irq/intc.c
+++ b/arch/sh/kernel/cpu/irq/intc.c
@@ -87,40 +87,71 @@ static void enable_prio_32(struct intc_desc *desc, unsigned int data)
         ctrl_outl(set_prio_field(desc, ctrl_inl(addr), prio, data), addr);
 }
 
-static void disable_mask_8(struct intc_desc *desc, unsigned int data)
+static void write_set_reg_8(struct intc_desc *desc, unsigned int data)
 {
         ctrl_outb(1 << _INTC_BIT(data),
                   _INTC_PTR(desc, mask_regs, data)->set_reg);
 }
 
-static void enable_mask_8(struct intc_desc *desc, unsigned int data)
+static void write_clr_reg_8(struct intc_desc *desc, unsigned int data)
 {
         ctrl_outb(1 << _INTC_BIT(data),
                   _INTC_PTR(desc, mask_regs, data)->clr_reg);
 }
 
-static void disable_mask_32(struct intc_desc *desc, unsigned int data)
+static void write_set_reg_32(struct intc_desc *desc, unsigned int data)
 {
         ctrl_outl(1 << _INTC_BIT(data),
                   _INTC_PTR(desc, mask_regs, data)->set_reg);
 }
 
-static void enable_mask_32(struct intc_desc *desc, unsigned int data)
+static void write_clr_reg_32(struct intc_desc *desc, unsigned int data)
 {
         ctrl_outl(1 << _INTC_BIT(data),
                   _INTC_PTR(desc, mask_regs, data)->clr_reg);
 }
 
+static void or_set_reg_16(struct intc_desc *desc, unsigned int data)
+{
+        unsigned long addr = _INTC_PTR(desc, mask_regs, data)->set_reg;
+
+        ctrl_outw(ctrl_inw(addr) | 1 << _INTC_BIT(data), addr);
+}
+
+static void and_set_reg_16(struct intc_desc *desc, unsigned int data)
+{
+        unsigned long addr = _INTC_PTR(desc, mask_regs, data)->set_reg;
+
+        ctrl_outw(ctrl_inw(addr) & ~(1 << _INTC_BIT(data)), addr);
+}
+
+static void or_set_reg_32(struct intc_desc *desc, unsigned int data)
+{
+        unsigned long addr = _INTC_PTR(desc, mask_regs, data)->set_reg;
+
+        ctrl_outl(ctrl_inl(addr) | 1 << _INTC_BIT(data), addr);
+}
+
+static void and_set_reg_32(struct intc_desc *desc, unsigned int data)
+{
+        unsigned long addr = _INTC_PTR(desc, mask_regs, data)->set_reg;
+
+        ctrl_outl(ctrl_inl(addr) & ~(1 << _INTC_BIT(data)), addr);
+}
+
 enum {  REG_FN_ERROR=0,
-        REG_FN_MASK_8, REG_FN_MASK_32,
+        REG_FN_DUAL_8, REG_FN_DUAL_32,
+        REG_FN_ENA_16, REG_FN_ENA_32,
         REG_FN_PRIO_16, REG_FN_PRIO_32 };
 
 static struct {
         void (*enable)(struct intc_desc *, unsigned int);
         void (*disable)(struct intc_desc *, unsigned int);
 } intc_reg_fns[] = {
-        [REG_FN_MASK_8] = { enable_mask_8, disable_mask_8 },
-        [REG_FN_MASK_32] = { enable_mask_32, disable_mask_32 },
+        [REG_FN_DUAL_8] = { write_clr_reg_8, write_set_reg_8 },
+        [REG_FN_DUAL_32] = { write_clr_reg_32, write_set_reg_32 },
+        [REG_FN_ENA_16] = { or_set_reg_16, and_set_reg_16 },
+        [REG_FN_ENA_32] = { or_set_reg_32, and_set_reg_32 },
         [REG_FN_PRIO_16] = { enable_prio_16, disable_prio_16 },
         [REG_FN_PRIO_32] = { enable_prio_32, disable_prio_32 },
 };
@@ -218,13 +249,13 @@ static int intc_set_sense(unsigned int irq, unsigned int type)
         return -EINVAL;
 }
 
-static unsigned int __init intc_find_mask_handler(unsigned int width)
+static unsigned int __init intc_find_dual_handler(unsigned int width)
 {
         switch (width) {
         case 8:
-                return REG_FN_MASK_8;
+                return REG_FN_DUAL_8;
         case 32:
-                return REG_FN_MASK_32;
+                return REG_FN_DUAL_32;
         }
 
         BUG();
@@ -244,6 +275,19 @@ static unsigned int __init intc_find_prio_handler(unsigned int width)
         return REG_FN_ERROR;
 }
 
+static unsigned int __init intc_find_ena_handler(unsigned int width)
+{
+        switch (width) {
+        case 16:
+                return REG_FN_ENA_16;
+        case 32:
+                return REG_FN_ENA_32;
+        }
+
+        BUG();
+        return REG_FN_ERROR;
+}
+
 static intc_enum __init intc_grp_id(struct intc_desc *desc, intc_enum enum_id)
 {
         struct intc_group *g = desc->groups;
@@ -301,7 +345,14 @@ static unsigned int __init intc_mask_data(struct intc_desc *desc,
                         if (mr->enum_ids[j] != enum_id)
                                 continue;
 
-                        fn = intc_find_mask_handler(mr->reg_width);
+                        switch (mr->clr_reg) {
+                        case 1: /* 1 = enabled interrupt - "enable" register */
+                                fn = intc_find_ena_handler(mr->reg_width);
+                                break;
+                        default:
+                                fn = intc_find_dual_handler(mr->reg_width);
+                        }
+
                         if (fn == REG_FN_ERROR)
                                 return 0;