MIPS: Alchemy: devboards: factor out PB1200 IRQ cascade code.
Move the PB1200 IRQ cascade code out to the BCSR support code:
upcoming DB1300 support can use it too.
Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/alchemy/devboards/bcsr.c b/arch/mips/alchemy/devboards/bcsr.c
index 85b7715..3bc4fd2 100644
--- a/arch/mips/alchemy/devboards/bcsr.c
+++ b/arch/mips/alchemy/devboards/bcsr.c
@@ -7,6 +7,7 @@
* All registers are 16bits wide with 32bit spacing.
*/
+#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <asm/addrspace.h>
@@ -18,6 +19,9 @@
spinlock_t lock;
} bcsr_regs[BCSR_CNT];
+static void __iomem *bcsr_virt; /* KSEG1 addr of BCSR base */
+static int bcsr_csc_base; /* linux-irq of first cascaded irq */
+
void __init bcsr_init(unsigned long bcsr1_phys, unsigned long bcsr2_phys)
{
int i;
@@ -25,6 +29,8 @@
bcsr1_phys = KSEG1ADDR(CPHYSADDR(bcsr1_phys));
bcsr2_phys = KSEG1ADDR(CPHYSADDR(bcsr2_phys));
+ bcsr_virt = (void __iomem *)bcsr1_phys;
+
for (i = 0; i < BCSR_CNT; i++) {
if (i >= BCSR_HEXLEDS)
bcsr_regs[i].raddr = (void __iomem *)bcsr2_phys +
@@ -74,3 +80,69 @@
spin_unlock_irqrestore(&bcsr_regs[reg].lock, flags);
}
EXPORT_SYMBOL_GPL(bcsr_mod);
+
+/*
+ * DB1200/PB1200 CPLD IRQ muxer
+ */
+static void bcsr_csc_handler(unsigned int irq, struct irq_desc *d)
+{
+ unsigned short bisr = __raw_readw(bcsr_virt + BCSR_REG_INTSTAT);
+
+ for ( ; bisr; bisr &= bisr - 1)
+ generic_handle_irq(bcsr_csc_base + __ffs(bisr));
+}
+
+/* NOTE: both the enable and mask bits must be cleared, otherwise the
+ * CPLD generates tons of spurious interrupts (at least on my DB1200).
+ * -- mlau
+ */
+static void bcsr_irq_mask(unsigned int irq_nr)
+{
+ unsigned short v = 1 << (irq_nr - bcsr_csc_base);
+ __raw_writew(v, bcsr_virt + BCSR_REG_INTCLR);
+ __raw_writew(v, bcsr_virt + BCSR_REG_MASKCLR);
+ wmb();
+}
+
+static void bcsr_irq_maskack(unsigned int irq_nr)
+{
+ unsigned short v = 1 << (irq_nr - bcsr_csc_base);
+ __raw_writew(v, bcsr_virt + BCSR_REG_INTCLR);
+ __raw_writew(v, bcsr_virt + BCSR_REG_MASKCLR);
+ __raw_writew(v, bcsr_virt + BCSR_REG_INTSTAT); /* ack */
+ wmb();
+}
+
+static void bcsr_irq_unmask(unsigned int irq_nr)
+{
+ unsigned short v = 1 << (irq_nr - bcsr_csc_base);
+ __raw_writew(v, bcsr_virt + BCSR_REG_INTSET);
+ __raw_writew(v, bcsr_virt + BCSR_REG_MASKSET);
+ wmb();
+}
+
+static struct irq_chip bcsr_irq_type = {
+ .name = "CPLD",
+ .mask = bcsr_irq_mask,
+ .mask_ack = bcsr_irq_maskack,
+ .unmask = bcsr_irq_unmask,
+};
+
+void __init bcsr_init_irq(int csc_start, int csc_end, int hook_irq)
+{
+ unsigned int irq;
+
+ /* mask & disable & ack all */
+ __raw_writew(0xffff, bcsr_virt + BCSR_REG_INTCLR);
+ __raw_writew(0xffff, bcsr_virt + BCSR_REG_MASKCLR);
+ __raw_writew(0xffff, bcsr_virt + BCSR_REG_INTSTAT);
+ wmb();
+
+ bcsr_csc_base = csc_start;
+
+ for (irq = csc_start; irq <= csc_end; irq++)
+ set_irq_chip_and_handler_name(irq, &bcsr_irq_type,
+ handle_level_irq, "level");
+
+ set_irq_chained_handler(hook_irq, bcsr_csc_handler);
+}