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ARM: integrator/versatile: consolidate FPGA IRQ handling code
Consolidate the FPGA IRQ handling code. Integrator/AP and Versatile have one FPGA-based IRQ handler each. Integrator/CP has three. Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Russell King
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Feb 19, 2011
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,5 +1,6 @@ | ||
| obj-y := clock.o | ||
| obj-$(CONFIG_PLAT_VERSATILE_CLCD) += clcd.o | ||
| obj-$(CONFIG_PLAT_VERSATILE_FPGA_IRQ) += fpga-irq.o | ||
| obj-$(CONFIG_PLAT_VERSATILE_LEDS) += leds.o | ||
| obj-$(CONFIG_PLAT_VERSATILE_SCHED_CLOCK) += sched-clock.o | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| /* | ||
| * Support for Versatile FPGA-based IRQ controllers | ||
| */ | ||
| #include <linux/irq.h> | ||
| #include <linux/io.h> | ||
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| #include <asm/mach/irq.h> | ||
| #include <plat/fpga-irq.h> | ||
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| #define IRQ_STATUS 0x00 | ||
| #define IRQ_RAW_STATUS 0x04 | ||
| #define IRQ_ENABLE_SET 0x08 | ||
| #define IRQ_ENABLE_CLEAR 0x0c | ||
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| static void fpga_irq_mask(struct irq_data *d) | ||
| { | ||
| struct fpga_irq_data *f = irq_data_get_irq_chip_data(d); | ||
| u32 mask = 1 << (d->irq - f->irq_start); | ||
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| writel(mask, f->base + IRQ_ENABLE_CLEAR); | ||
| } | ||
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| static void fpga_irq_unmask(struct irq_data *d) | ||
| { | ||
| struct fpga_irq_data *f = irq_data_get_irq_chip_data(d); | ||
| u32 mask = 1 << (d->irq - f->irq_start); | ||
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| writel(mask, f->base + IRQ_ENABLE_SET); | ||
| } | ||
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| static void fpga_irq_handle(unsigned int irq, struct irq_desc *desc) | ||
| { | ||
| struct fpga_irq_data *f = get_irq_desc_data(desc); | ||
| u32 status = readl(f->base + IRQ_STATUS); | ||
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| if (status == 0) { | ||
| do_bad_IRQ(irq, desc); | ||
| return; | ||
| } | ||
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| do { | ||
| irq = ffs(status) - 1; | ||
| status &= ~(1 << irq); | ||
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| generic_handle_irq(irq + f->irq_start); | ||
| } while (status); | ||
| } | ||
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| void __init fpga_irq_init(int parent_irq, u32 valid, struct fpga_irq_data *f) | ||
| { | ||
| unsigned int i; | ||
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| f->chip.irq_ack = fpga_irq_mask; | ||
| f->chip.irq_mask = fpga_irq_mask; | ||
| f->chip.irq_unmask = fpga_irq_unmask; | ||
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| if (parent_irq != -1) { | ||
| set_irq_data(parent_irq, f); | ||
| set_irq_chained_handler(parent_irq, fpga_irq_handle); | ||
| } | ||
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| for (i = 0; i < 32; i++) { | ||
| if (valid & (1 << i)) { | ||
| unsigned int irq = f->irq_start + i; | ||
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| set_irq_chip_data(irq, f); | ||
| set_irq_chip(irq, &f->chip); | ||
| set_irq_handler(irq, handle_level_irq); | ||
| set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,12 @@ | ||
| #ifndef PLAT_FPGA_IRQ_H | ||
| #define PLAT_FPGA_IRQ_H | ||
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| struct fpga_irq_data { | ||
| void __iomem *base; | ||
| unsigned int irq_start; | ||
| struct irq_chip chip; | ||
| }; | ||
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| void fpga_irq_init(int, u32, struct fpga_irq_data *); | ||
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| #endif |