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-rw-r--r--arch/arm/mach-rpc/irq.c226
1 files changed, 226 insertions, 0 deletions
diff --git a/arch/arm/mach-rpc/irq.c b/arch/arm/mach-rpc/irq.c
new file mode 100644
index 0000000000..dc29384b6e
--- /dev/null
+++ b/arch/arm/mach-rpc/irq.c
@@ -0,0 +1,226 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/io.h>
+
+#include <asm/mach/irq.h>
+#include <asm/hardware/iomd.h>
+#include <asm/irq.h>
+#include <asm/fiq.h>
+
+// These are offsets from the stat register for each IRQ bank
+#define STAT 0x00
+#define REQ 0x04
+#define CLR 0x04
+#define MASK 0x08
+
+static const u8 irq_prio_h[256] = {
+ 0, 8, 9, 8,10,10,10,10,11,11,11,11,10,10,10,10,
+ 12, 8, 9, 8,10,10,10,10,11,11,11,11,10,10,10,10,
+ 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
+ 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
+ 14,14,14,14,10,10,10,10,11,11,11,11,10,10,10,10,
+ 14,14,14,14,10,10,10,10,11,11,11,11,10,10,10,10,
+ 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
+ 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
+ 15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10,
+ 15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10,
+ 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
+ 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
+ 15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10,
+ 15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10,
+ 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
+ 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
+};
+
+static const u8 irq_prio_d[256] = {
+ 0,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 20,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 22,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 22,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 23,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 23,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 22,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 22,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+};
+
+static const u8 irq_prio_l[256] = {
+ 0, 0, 1, 0, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
+ 4, 0, 1, 0, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
+ 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+ 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+ 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3,
+ 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3,
+ 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+ 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+};
+
+static int iomd_get_irq_nr(void)
+{
+ int irq;
+ u8 reg;
+
+ /* get highest priority first */
+ reg = readb(IOC_BASE + IOMD_IRQREQB);
+ irq = irq_prio_h[reg];
+ if (irq)
+ return irq;
+
+ /* get DMA */
+ reg = readb(IOC_BASE + IOMD_DMAREQ);
+ irq = irq_prio_d[reg];
+ if (irq)
+ return irq;
+
+ /* get low priority */
+ reg = readb(IOC_BASE + IOMD_IRQREQA);
+ irq = irq_prio_l[reg];
+ if (irq)
+ return irq;
+ return 0;
+}
+
+static void iomd_handle_irq(struct pt_regs *regs)
+{
+ int irq;
+
+ do {
+ irq = iomd_get_irq_nr();
+ if (irq)
+ generic_handle_irq(irq);
+ } while (irq);
+}
+
+static void __iomem *iomd_get_base(struct irq_data *d)
+{
+ void *cd = irq_data_get_irq_chip_data(d);
+
+ return (void __iomem *)(unsigned long)cd;
+}
+
+static void iomd_set_base_mask(unsigned int irq, void __iomem *base, u32 mask)
+{
+ struct irq_data *d = irq_get_irq_data(irq);
+
+ d->mask = mask;
+ irq_set_chip_data(irq, (void *)(unsigned long)base);
+}
+
+static void iomd_irq_mask_ack(struct irq_data *d)
+{
+ void __iomem *base = iomd_get_base(d);
+ unsigned int val, mask = d->mask;
+
+ val = readb(base + MASK);
+ writeb(val & ~mask, base + MASK);
+ writeb(mask, base + CLR);
+}
+
+static void iomd_irq_mask(struct irq_data *d)
+{
+ void __iomem *base = iomd_get_base(d);
+ unsigned int val, mask = d->mask;
+
+ val = readb(base + MASK);
+ writeb(val & ~mask, base + MASK);
+}
+
+static void iomd_irq_unmask(struct irq_data *d)
+{
+ void __iomem *base = iomd_get_base(d);
+ unsigned int val, mask = d->mask;
+
+ val = readb(base + MASK);
+ writeb(val | mask, base + MASK);
+}
+
+static struct irq_chip iomd_chip_clr = {
+ .irq_mask_ack = iomd_irq_mask_ack,
+ .irq_mask = iomd_irq_mask,
+ .irq_unmask = iomd_irq_unmask,
+};
+
+static struct irq_chip iomd_chip_noclr = {
+ .irq_mask = iomd_irq_mask,
+ .irq_unmask = iomd_irq_unmask,
+};
+
+extern unsigned char rpc_default_fiq_start, rpc_default_fiq_end;
+
+void __init rpc_init_irq(void)
+{
+ unsigned int irq, clr, set;
+
+ iomd_writeb(0, IOMD_IRQMASKA);
+ iomd_writeb(0, IOMD_IRQMASKB);
+ iomd_writeb(0, IOMD_FIQMASK);
+ iomd_writeb(0, IOMD_DMAMASK);
+
+ set_fiq_handler(&rpc_default_fiq_start,
+ &rpc_default_fiq_end - &rpc_default_fiq_start);
+
+ set_handle_irq(iomd_handle_irq);
+
+ for (irq = 0; irq < NR_IRQS; irq++) {
+ clr = IRQ_NOREQUEST;
+ set = 0;
+
+ if (irq <= 6 || (irq >= 9 && irq <= 15))
+ clr |= IRQ_NOPROBE;
+
+ if (irq == 21 || (irq >= 16 && irq <= 19) ||
+ irq == IRQ_KEYBOARDTX)
+ set |= IRQ_NOAUTOEN;
+
+ switch (irq) {
+ case 0 ... 7:
+ irq_set_chip_and_handler(irq, &iomd_chip_clr,
+ handle_level_irq);
+ irq_modify_status(irq, clr, set);
+ iomd_set_base_mask(irq, IOMD_BASE + IOMD_IRQSTATA,
+ BIT(irq));
+ break;
+
+ case 8 ... 15:
+ irq_set_chip_and_handler(irq, &iomd_chip_noclr,
+ handle_level_irq);
+ irq_modify_status(irq, clr, set);
+ iomd_set_base_mask(irq, IOMD_BASE + IOMD_IRQSTATB,
+ BIT(irq - 8));
+ break;
+
+ case 16 ... 21:
+ irq_set_chip_and_handler(irq, &iomd_chip_noclr,
+ handle_level_irq);
+ irq_modify_status(irq, clr, set);
+ iomd_set_base_mask(irq, IOMD_BASE + IOMD_DMASTAT,
+ BIT(irq - 16));
+ break;
+
+ case 64 ... 71:
+ irq_set_chip(irq, &iomd_chip_noclr);
+ irq_modify_status(irq, clr, set);
+ iomd_set_base_mask(irq, IOMD_BASE + IOMD_FIQSTAT,
+ BIT(irq - 64));
+ break;
+ }
+ }
+
+ init_FIQ(FIQ_START);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-17 22:35:11 +0000