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Diffstat (limited to 'arch/arm/mach-s5p64x0/irq-eint.c')
-rw-r--r--arch/arm/mach-s5p64x0/irq-eint.c152
1 files changed, 152 insertions, 0 deletions
diff --git a/arch/arm/mach-s5p64x0/irq-eint.c b/arch/arm/mach-s5p64x0/irq-eint.c
new file mode 100644
index 00000000000..69ed4545112
--- /dev/null
+++ b/arch/arm/mach-s5p64x0/irq-eint.c
@@ -0,0 +1,152 @@
+/* arch/arm/mach-s5p64x0/irq-eint.c
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd
+ * http://www.samsung.com/
+ *
+ * Based on linux/arch/arm/mach-s3c64xx/irq-eint.c
+ *
+ * S5P64X0 - Interrupt handling for External Interrupts.
+ *
+ * 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/kernel.h>
+#include <linux/gpio.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+
+#include <plat/regs-irqtype.h>
+#include <plat/gpio-cfg.h>
+
+#include <mach/regs-gpio.h>
+#include <mach/regs-clock.h>
+
+#define eint_offset(irq) ((irq) - IRQ_EINT(0))
+
+static int s5p64x0_irq_eint_set_type(struct irq_data *data, unsigned int type)
+{
+ int offs = eint_offset(data->irq);
+ int shift;
+ u32 ctrl, mask;
+ u32 newvalue = 0;
+
+ if (offs > 15)
+ return -EINVAL;
+
+ switch (type) {
+ case IRQ_TYPE_NONE:
+ printk(KERN_WARNING "No edge setting!\n");
+ break;
+ case IRQ_TYPE_EDGE_RISING:
+ newvalue = S3C2410_EXTINT_RISEEDGE;
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ newvalue = S3C2410_EXTINT_FALLEDGE;
+ break;
+ case IRQ_TYPE_EDGE_BOTH:
+ newvalue = S3C2410_EXTINT_BOTHEDGE;
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ newvalue = S3C2410_EXTINT_LOWLEV;
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ newvalue = S3C2410_EXTINT_HILEV;
+ break;
+ default:
+ printk(KERN_ERR "No such irq type %d", type);
+ return -EINVAL;
+ }
+
+ shift = (offs / 2) * 4;
+ mask = 0x7 << shift;
+
+ ctrl = __raw_readl(S5P64X0_EINT0CON0) & ~mask;
+ ctrl |= newvalue << shift;
+ __raw_writel(ctrl, S5P64X0_EINT0CON0);
+
+ /* Configure the GPIO pin for 6450 or 6440 based on CPU ID */
+ if (0x50000 == (__raw_readl(S5P64X0_SYS_ID) & 0xFF000))
+ s3c_gpio_cfgpin(S5P6450_GPN(offs), S3C_GPIO_SFN(2));
+ else
+ s3c_gpio_cfgpin(S5P6440_GPN(offs), S3C_GPIO_SFN(2));
+
+ return 0;
+}
+
+/*
+ * s5p64x0_irq_demux_eint
+ *
+ * This function demuxes the IRQ from the group0 external interrupts,
+ * from IRQ_EINT(0) to IRQ_EINT(15). It is designed to be inlined into
+ * the specific handlers s5p64x0_irq_demux_eintX_Y.
+ */
+static inline void s5p64x0_irq_demux_eint(unsigned int start, unsigned int end)
+{
+ u32 status = __raw_readl(S5P64X0_EINT0PEND);
+ u32 mask = __raw_readl(S5P64X0_EINT0MASK);
+ unsigned int irq;
+
+ status &= ~mask;
+ status >>= start;
+ status &= (1 << (end - start + 1)) - 1;
+
+ for (irq = IRQ_EINT(start); irq <= IRQ_EINT(end); irq++) {
+ if (status & 1)
+ generic_handle_irq(irq);
+ status >>= 1;
+ }
+}
+
+static void s5p64x0_irq_demux_eint0_3(unsigned int irq, struct irq_desc *desc)
+{
+ s5p64x0_irq_demux_eint(0, 3);
+}
+
+static void s5p64x0_irq_demux_eint4_11(unsigned int irq, struct irq_desc *desc)
+{
+ s5p64x0_irq_demux_eint(4, 11);
+}
+
+static void s5p64x0_irq_demux_eint12_15(unsigned int irq,
+ struct irq_desc *desc)
+{
+ s5p64x0_irq_demux_eint(12, 15);
+}
+
+static int s5p64x0_alloc_gc(void)
+{
+ struct irq_chip_generic *gc;
+ struct irq_chip_type *ct;
+
+ gc = irq_alloc_generic_chip("s5p64x0-eint", 1, S5P_IRQ_EINT_BASE,
+ S5P_VA_GPIO, handle_level_irq);
+ if (!gc) {
+ printk(KERN_ERR "%s: irq_alloc_generic_chip for group 0"
+ "external interrupts failed\n", __func__);
+ return -EINVAL;
+ }
+
+ ct = gc->chip_types;
+ ct->chip.irq_ack = irq_gc_ack;
+ ct->chip.irq_mask = irq_gc_mask_set_bit;
+ ct->chip.irq_unmask = irq_gc_mask_clr_bit;
+ ct->chip.irq_set_type = s5p64x0_irq_eint_set_type;
+ ct->regs.ack = EINT0PEND_OFFSET;
+ ct->regs.mask = EINT0MASK_OFFSET;
+ irq_setup_generic_chip(gc, IRQ_MSK(16), IRQ_GC_INIT_MASK_CACHE,
+ IRQ_NOREQUEST | IRQ_NOPROBE, 0);
+ return 0;
+}
+
+static int __init s5p64x0_init_irq_eint(void)
+{
+ int ret = s5p64x0_alloc_gc();
+ irq_set_chained_handler(IRQ_EINT0_3, s5p64x0_irq_demux_eint0_3);
+ irq_set_chained_handler(IRQ_EINT4_11, s5p64x0_irq_demux_eint4_11);
+ irq_set_chained_handler(IRQ_EINT12_15, s5p64x0_irq_demux_eint12_15);
+
+ return ret;
+}
+arch_initcall(s5p64x0_init_irq_eint);