[ARM] 3466/1: [2/3] Support for Philips PNX4008 platform: chip support

Patch from Vitaly Wool

This patch adds basic chip support for PNX4008 ARM platform.
It's basically the same as the previous one, but with the rmk's
comments taken into account.

Signed-off-by: Vitaly Wool <vwool@ru.mvista.com>
Signed-off-by: Dmitry Pervushin <dpervushin@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 121 insertions, 0 deletions

diff --git a/arch/arm/mach-pnx4008/irq.c b/arch/arm/mach-pnx4008/irq.c
new file mode 100644
index 00000000000..9b0a8e084e9
--- /dev/null
+++ b/arch/arm/mach-pnx4008/irq.c
@@ -0,0 +1,121 @@
+/*
+ * arch/arm/mach-pnx4008/irq.c
+ *
+ * PNX4008 IRQ controller driver
+ *
+ * Author: Dmitry Chigirev <source@mvista.com>
+ *
+ * Based on reference code received from Philips:
+ * Copyright (C) 2003 Philips Semiconductors
+ *
+ * 2005 (c) MontaVista Software, Inc. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/device.h>
+#include <asm/hardware.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/setup.h>
+#include <asm/mach-types.h>
+#include <asm/pgtable.h>
+#include <asm/page.h>
+#include <asm/system.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/irq.h>
+#include <asm/mach/map.h>
+#include <asm/arch/irq.h>
+
+static u8 pnx4008_irq_type[NR_IRQS] = PNX4008_IRQ_TYPES;
+
+static void pnx4008_mask_irq(unsigned int irq)
+{
+	__raw_writel(__raw_readl(INTC_ER(irq)) & ~INTC_BIT(irq), INTC_ER(irq));	/* mask interrupt */
+}
+
+static void pnx4008_unmask_irq(unsigned int irq)
+{
+	__raw_writel(__raw_readl(INTC_ER(irq)) | INTC_BIT(irq), INTC_ER(irq));	/* unmask interrupt */
+}
+
+static void pnx4008_mask_ack_irq(unsigned int irq)
+{
+	__raw_writel(__raw_readl(INTC_ER(irq)) & ~INTC_BIT(irq), INTC_ER(irq));	/* mask interrupt */
+	__raw_writel(INTC_BIT(irq), INTC_SR(irq));	/* clear interrupt status */
+}
+
+static int pnx4008_set_irq_type(unsigned int irq, unsigned int type)
+{
+	switch (type) {
+	case IRQT_RISING:
+		__raw_writel(__raw_readl(INTC_ATR(irq)) | INTC_BIT(irq), INTC_ATR(irq));	/*edge sensitive */
+		__raw_writel(__raw_readl(INTC_APR(irq)) | INTC_BIT(irq), INTC_APR(irq));	/*rising edge */
+		set_irq_handler(irq, do_edge_IRQ);
+		break;
+	case IRQT_FALLING:
+		__raw_writel(__raw_readl(INTC_ATR(irq)) | INTC_BIT(irq), INTC_ATR(irq));	/*edge sensitive */
+		__raw_writel(__raw_readl(INTC_APR(irq)) & ~INTC_BIT(irq), INTC_APR(irq));	/*falling edge */
+		set_irq_handler(irq, do_edge_IRQ);
+		break;
+	case IRQT_LOW:
+		__raw_writel(__raw_readl(INTC_ATR(irq)) & ~INTC_BIT(irq), INTC_ATR(irq));	/*level sensitive */
+		__raw_writel(__raw_readl(INTC_APR(irq)) & ~INTC_BIT(irq), INTC_APR(irq));	/*low level */
+		set_irq_handler(irq, do_level_IRQ);
+		break;
+	case IRQT_HIGH:
+		__raw_writel(__raw_readl(INTC_ATR(irq)) & ~INTC_BIT(irq), INTC_ATR(irq));	/*level sensitive */
+		__raw_writel(__raw_readl(INTC_APR(irq)) | INTC_BIT(irq), INTC_APR(irq));	/* high level */
+		set_irq_handler(irq, do_level_IRQ);
+		break;
+
+	/* IRQT_BOTHEDGE is not supported */
+	default:
+		printk(KERN_ERR "PNX4008 IRQ: Unsupported irq type %d\n", type);
+		return -1;
+	}
+	return 0;
+}
+
+static struct irqchip pnx4008_irq_chip = {
+	.ack = pnx4008_mask_ack_irq,
+	.mask = pnx4008_mask_irq,
+	.unmask = pnx4008_unmask_irq,
+	.set_type = pnx4008_set_irq_type,
+};
+
+void __init pnx4008_init_irq(void)
+{
+	unsigned int i;
+
+	/* configure and enable IRQ 0,1,30,31 (cascade interrupts) mask all others */
+	pnx4008_set_irq_type(SUB1_IRQ_N, pnx4008_irq_type[SUB1_IRQ_N]);
+	pnx4008_set_irq_type(SUB2_IRQ_N, pnx4008_irq_type[SUB2_IRQ_N]);
+	pnx4008_set_irq_type(SUB1_FIQ_N, pnx4008_irq_type[SUB1_FIQ_N]);
+	pnx4008_set_irq_type(SUB2_FIQ_N, pnx4008_irq_type[SUB2_FIQ_N]);
+
+	__raw_writel((1 << SUB2_FIQ_N) | (1 << SUB1_FIQ_N) |
+			(1 << SUB2_IRQ_N) | (1 << SUB1_IRQ_N),
+		INTC_ER(MAIN_BASE_INT));
+	__raw_writel(0, INTC_ER(SIC1_BASE_INT));
+	__raw_writel(0, INTC_ER(SIC2_BASE_INT));
+
+	/* configure all other IRQ's */
+	for (i = 0; i < NR_IRQS; i++) {
+		if (i == SUB2_FIQ_N || i == SUB1_FIQ_N ||
+			i == SUB2_IRQ_N || i == SUB1_IRQ_N)
+			continue;
+		set_irq_flags(i, IRQF_VALID);
+		set_irq_chip(i, &pnx4008_irq_chip);
+		pnx4008_set_irq_type(i, pnx4008_irq_type[i]);
+	}
+}
+