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-rw-r--r--arch/arm/mach-mmp/irq-mmp2.c154
1 files changed, 154 insertions, 0 deletions
diff --git a/arch/arm/mach-mmp/irq-mmp2.c b/arch/arm/mach-mmp/irq-mmp2.c
new file mode 100644
index 0000000..cb18221
--- /dev/null
+++ b/arch/arm/mach-mmp/irq-mmp2.c
@@ -0,0 +1,154 @@
+/*
+ * linux/arch/arm/mach-mmp/irq-mmp2.c
+ *
+ * Generic IRQ handling, GPIO IRQ demultiplexing, etc.
+ *
+ * Author: Haojian Zhuang <haojian.zhuang@marvell.com>
+ * Copyright: Marvell International Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+
+#include <mach/regs-icu.h>
+
+#include "common.h"
+
+static void icu_mask_irq(unsigned int irq)
+{
+ uint32_t r = __raw_readl(ICU_INT_CONF(irq));
+
+ r &= ~ICU_INT_ROUTE_PJ4_IRQ;
+ __raw_writel(r, ICU_INT_CONF(irq));
+}
+
+static void icu_unmask_irq(unsigned int irq)
+{
+ uint32_t r = __raw_readl(ICU_INT_CONF(irq));
+
+ r |= ICU_INT_ROUTE_PJ4_IRQ;
+ __raw_writel(r, ICU_INT_CONF(irq));
+}
+
+static struct irq_chip icu_irq_chip = {
+ .name = "icu_irq",
+ .mask = icu_mask_irq,
+ .mask_ack = icu_mask_irq,
+ .unmask = icu_unmask_irq,
+};
+
+static void pmic_irq_ack(unsigned int irq)
+{
+ if (irq == IRQ_MMP2_PMIC)
+ mmp2_clear_pmic_int();
+}
+
+#define SECOND_IRQ_MASK(_name_, irq_base, prefix) \
+static void _name_##_mask_irq(unsigned int irq) \
+{ \
+ uint32_t r; \
+ r = __raw_readl(prefix##_MASK) | (1 << (irq - irq_base)); \
+ __raw_writel(r, prefix##_MASK); \
+}
+
+#define SECOND_IRQ_UNMASK(_name_, irq_base, prefix) \
+static void _name_##_unmask_irq(unsigned int irq) \
+{ \
+ uint32_t r; \
+ r = __raw_readl(prefix##_MASK) & ~(1 << (irq - irq_base)); \
+ __raw_writel(r, prefix##_MASK); \
+}
+
+#define SECOND_IRQ_DEMUX(_name_, irq_base, prefix) \
+static void _name_##_irq_demux(unsigned int irq, struct irq_desc *desc) \
+{ \
+ unsigned long status, mask, n; \
+ mask = __raw_readl(prefix##_MASK); \
+ while (1) { \
+ status = __raw_readl(prefix##_STATUS) & ~mask; \
+ if (status == 0) \
+ break; \
+ n = find_first_bit(&status, BITS_PER_LONG); \
+ while (n < BITS_PER_LONG) { \
+ generic_handle_irq(irq_base + n); \
+ n = find_next_bit(&status, BITS_PER_LONG, n+1); \
+ } \
+ } \
+}
+
+#define SECOND_IRQ_CHIP(_name_, irq_base, prefix) \
+SECOND_IRQ_MASK(_name_, irq_base, prefix) \
+SECOND_IRQ_UNMASK(_name_, irq_base, prefix) \
+SECOND_IRQ_DEMUX(_name_, irq_base, prefix) \
+static struct irq_chip _name_##_irq_chip = { \
+ .name = #_name_, \
+ .mask = _name_##_mask_irq, \
+ .unmask = _name_##_unmask_irq, \
+}
+
+SECOND_IRQ_CHIP(pmic, IRQ_MMP2_PMIC_BASE, MMP2_ICU_INT4);
+SECOND_IRQ_CHIP(rtc, IRQ_MMP2_RTC_BASE, MMP2_ICU_INT5);
+SECOND_IRQ_CHIP(twsi, IRQ_MMP2_TWSI_BASE, MMP2_ICU_INT17);
+SECOND_IRQ_CHIP(misc, IRQ_MMP2_MISC_BASE, MMP2_ICU_INT35);
+SECOND_IRQ_CHIP(ssp, IRQ_MMP2_SSP_BASE, MMP2_ICU_INT51);
+
+static void init_mux_irq(struct irq_chip *chip, int start, int num)
+{
+ int irq;
+
+ for (irq = start; num > 0; irq++, num--) {
+ /* mask and clear the IRQ */
+ chip->mask(irq);
+ if (chip->ack)
+ chip->ack(irq);
+
+ set_irq_chip(irq, chip);
+ set_irq_flags(irq, IRQF_VALID);
+ set_irq_handler(irq, handle_level_irq);
+ }
+}
+
+void __init mmp2_init_icu(void)
+{
+ int irq;
+
+ for (irq = 0; irq < IRQ_MMP2_MUX_BASE; irq++) {
+ icu_mask_irq(irq);
+ set_irq_chip(irq, &icu_irq_chip);
+ set_irq_flags(irq, IRQF_VALID);
+
+ switch (irq) {
+ case IRQ_MMP2_PMIC_MUX:
+ case IRQ_MMP2_RTC_MUX:
+ case IRQ_MMP2_TWSI_MUX:
+ case IRQ_MMP2_MISC_MUX:
+ case IRQ_MMP2_SSP_MUX:
+ break;
+ default:
+ set_irq_handler(irq, handle_level_irq);
+ break;
+ }
+ }
+
+ /* NOTE: IRQ_MMP2_PMIC requires the PMIC MFPR register
+ * to be written to clear the interrupt
+ */
+ pmic_irq_chip.ack = pmic_irq_ack;
+
+ init_mux_irq(&pmic_irq_chip, IRQ_MMP2_PMIC_BASE, 2);
+ init_mux_irq(&rtc_irq_chip, IRQ_MMP2_RTC_BASE, 2);
+ init_mux_irq(&twsi_irq_chip, IRQ_MMP2_TWSI_BASE, 5);
+ init_mux_irq(&misc_irq_chip, IRQ_MMP2_MISC_BASE, 15);
+ init_mux_irq(&ssp_irq_chip, IRQ_MMP2_SSP_BASE, 2);
+
+ set_irq_chained_handler(IRQ_MMP2_PMIC_MUX, pmic_irq_demux);
+ set_irq_chained_handler(IRQ_MMP2_RTC_MUX, rtc_irq_demux);
+ set_irq_chained_handler(IRQ_MMP2_TWSI_MUX, twsi_irq_demux);
+ set_irq_chained_handler(IRQ_MMP2_MISC_MUX, misc_irq_demux);
+ set_irq_chained_handler(IRQ_MMP2_SSP_MUX, ssp_irq_demux);
+}
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