summaryrefslogtreecommitdiffstats
path: root/arch/arm/plat-samsung
diff options
context:
space:
mode:
authorBen Dooks <ben-linux@fluff.org>2010-01-06 11:18:44 +0900
committerBen Dooks <ben-linux@fluff.org>2010-01-15 17:10:14 +0900
commit51022cf6591ae2945960d034788bdeffa28cde13 (patch)
tree30f85bb15cdd66384018c31cb42c4ba986a68da4 /arch/arm/plat-samsung
parent7162ba03729e0a47aaab44448ce2453f07a9664d (diff)
ARM: SAMSUNG: Move IRQ UART handling for newer devices to plat-samsung
Move the handling for the UART interrupts out of the s3c64xx specific code and into plat-samsung so that it can be used by all implementations that need it. Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Diffstat (limited to 'arch/arm/plat-samsung')
-rw-r--r--arch/arm/plat-samsung/Kconfig5
-rw-r--r--arch/arm/plat-samsung/Makefile1
-rw-r--r--arch/arm/plat-samsung/include/plat/irq-uart.h20
-rw-r--r--arch/arm/plat-samsung/irq-uart.c143
4 files changed, 169 insertions, 0 deletions
diff --git a/arch/arm/plat-samsung/Kconfig b/arch/arm/plat-samsung/Kconfig
index cedecd87d89..900b463fc19 100644
--- a/arch/arm/plat-samsung/Kconfig
+++ b/arch/arm/plat-samsung/Kconfig
@@ -26,6 +26,11 @@ config SAMSUNG_IRQ_VIC_TIMER
help
Internal configuration to build the VIC timer interrupt code.
+config SAMSUNG_IRQ_UART
+ bool
+ help
+ Internal configuration to build the IRQ UART demux code.
+
# options for gpio configuration support
config S3C_GPIO_CFG_S3C24XX
diff --git a/arch/arm/plat-samsung/Makefile b/arch/arm/plat-samsung/Makefile
index aa048c7337d..aeb7e12d1f6 100644
--- a/arch/arm/plat-samsung/Makefile
+++ b/arch/arm/plat-samsung/Makefile
@@ -17,6 +17,7 @@ obj-y += gpio-config.o
obj-$(CONFIG_SAMSUNG_CLKSRC) += clock-clksrc.o
+obj-$(CONFIG_SAMSUNG_IRQ_UART) += irq-uart.o
obj-$(CONFIG_SAMSUNG_IRQ_VIC_TIMER) += irq-vic-timer.o
# devices
diff --git a/arch/arm/plat-samsung/include/plat/irq-uart.h b/arch/arm/plat-samsung/include/plat/irq-uart.h
new file mode 100644
index 00000000000..a9331e49bea
--- /dev/null
+++ b/arch/arm/plat-samsung/include/plat/irq-uart.h
@@ -0,0 +1,20 @@
+/* arch/arm/plat-samsung/include/plat/irq-uart.h
+ *
+ * Copyright (c) 2010 Simtec Electronics
+ * Ben Dooks <ben@simtec.co.uk>
+ *
+ * Header file for Samsung SoC UART IRQ demux for S3C64XX and later
+ *
+ * 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.
+*/
+
+struct s3c_uart_irq {
+ void __iomem *regs;
+ unsigned int base_irq;
+ unsigned int parent_irq;
+};
+
+extern void s3c_init_uart_irqs(struct s3c_uart_irq *irq, unsigned int nr_irqs);
+
diff --git a/arch/arm/plat-samsung/irq-uart.c b/arch/arm/plat-samsung/irq-uart.c
new file mode 100644
index 00000000000..4f8c102674a
--- /dev/null
+++ b/arch/arm/plat-samsung/irq-uart.c
@@ -0,0 +1,143 @@
+/* arch/arm/plat-samsung/irq-uart.c
+ * originally part of arch/arm/plat-s3c64xx/irq.c
+ *
+ * Copyright 2008 Openmoko, Inc.
+ * Copyright 2008 Simtec Electronics
+ * Ben Dooks <ben@simtec.co.uk>
+ * http://armlinux.simtec.co.uk/
+ *
+ * Samsung- UART Interrupt handling
+ *
+ * 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/interrupt.h>
+#include <linux/serial_core.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+
+#include <mach/map.h>
+#include <plat/irq-uart.h>
+#include <plat/regs-serial.h>
+#include <plat/cpu.h>
+
+/* Note, we make use of the fact that the parent IRQs, IRQ_UART[0..3]
+ * are consecutive when looking up the interrupt in the demux routines.
+ */
+
+static inline void __iomem *s3c_irq_uart_base(unsigned int irq)
+{
+ struct s3c_uart_irq *uirq = get_irq_chip_data(irq);
+ return uirq->regs;
+}
+
+static inline unsigned int s3c_irq_uart_bit(unsigned int irq)
+{
+ return irq & 3;
+}
+
+static void s3c_irq_uart_mask(unsigned int irq)
+{
+ void __iomem *regs = s3c_irq_uart_base(irq);
+ unsigned int bit = s3c_irq_uart_bit(irq);
+ u32 reg;
+
+ reg = __raw_readl(regs + S3C64XX_UINTM);
+ reg |= (1 << bit);
+ __raw_writel(reg, regs + S3C64XX_UINTM);
+}
+
+static void s3c_irq_uart_maskack(unsigned int irq)
+{
+ void __iomem *regs = s3c_irq_uart_base(irq);
+ unsigned int bit = s3c_irq_uart_bit(irq);
+ u32 reg;
+
+ reg = __raw_readl(regs + S3C64XX_UINTM);
+ reg |= (1 << bit);
+ __raw_writel(reg, regs + S3C64XX_UINTM);
+ __raw_writel(1 << bit, regs + S3C64XX_UINTP);
+}
+
+static void s3c_irq_uart_unmask(unsigned int irq)
+{
+ void __iomem *regs = s3c_irq_uart_base(irq);
+ unsigned int bit = s3c_irq_uart_bit(irq);
+ u32 reg;
+
+ reg = __raw_readl(regs + S3C64XX_UINTM);
+ reg &= ~(1 << bit);
+ __raw_writel(reg, regs + S3C64XX_UINTM);
+}
+
+static void s3c_irq_uart_ack(unsigned int irq)
+{
+ void __iomem *regs = s3c_irq_uart_base(irq);
+ unsigned int bit = s3c_irq_uart_bit(irq);
+
+ __raw_writel(1 << bit, regs + S3C64XX_UINTP);
+}
+
+static void s3c_irq_demux_uart(unsigned int irq, struct irq_desc *desc)
+{
+ struct s3c_uart_irq *uirq = desc->handler_data;
+ u32 pend = __raw_readl(uirq->regs + S3C64XX_UINTP);
+ int base = uirq->base_irq;
+
+ if (pend & (1 << 0))
+ generic_handle_irq(base);
+ if (pend & (1 << 1))
+ generic_handle_irq(base + 1);
+ if (pend & (1 << 2))
+ generic_handle_irq(base + 2);
+ if (pend & (1 << 3))
+ generic_handle_irq(base + 3);
+}
+
+static struct irq_chip s3c_irq_uart = {
+ .name = "s3c-uart",
+ .mask = s3c_irq_uart_mask,
+ .unmask = s3c_irq_uart_unmask,
+ .mask_ack = s3c_irq_uart_maskack,
+ .ack = s3c_irq_uart_ack,
+};
+
+static void __init s3c_init_uart_irq(struct s3c_uart_irq *uirq)
+{
+ struct irq_desc *desc = irq_to_desc(uirq->parent_irq);
+ void __iomem *reg_base = uirq->regs;
+ unsigned int irq;
+ int offs;
+
+ /* mask all interrupts at the start. */
+ __raw_writel(0xf, reg_base + S3C64XX_UINTM);
+
+ for (offs = 0; offs < 3; offs++) {
+ irq = uirq->base_irq + offs;
+
+ set_irq_chip(irq, &s3c_irq_uart);
+ set_irq_chip_data(irq, uirq);
+ set_irq_handler(irq, handle_level_irq);
+ set_irq_flags(irq, IRQF_VALID);
+ }
+
+ desc->handler_data = uirq;
+ set_irq_chained_handler(uirq->parent_irq, s3c_irq_demux_uart);
+}
+
+/**
+ * s3c_init_uart_irqs() - initialise UART IRQs and the necessary demuxing
+ * @irq: The interrupt data for registering
+ * @nr_irqs: The number of interrupt descriptions in @irq.
+ *
+ * Register the UART interrupts specified by @irq including the demuxing
+ * routines. This supports the S3C6400 and newer style of devices.
+ */
+void __init s3c_init_uart_irqs(struct s3c_uart_irq *irq, unsigned int nr_irqs)
+{
+ for (; nr_irqs > 0; nr_irqs--, irq++)
+ s3c_init_uart_irq(irq);
+}