ARM: Add Gemini architecture v3

Adds support for Cortina Systems Gemini family CPUs:
http://www.cortina-systems.com/products/category/18

v3:
- fixed __io(a) to be defined as __typesafe_io(a)

v2:
- #include <asm/io.h> -> <linux/io.h>
- remove asm/system.h include
- revorked mm.c to use named initializers
- removed "empty" dma.h
- updated copyrights

Signed-off-by: Paulius Zaleckas <paulius.zaleckas@teltonika.lt>

1 files changed, 89 insertions, 0 deletions

diff --git a/arch/arm/mach-gemini/time.c b/arch/arm/mach-gemini/time.c
new file mode 100644
index 00000000000..21dc5a89d1c
--- /dev/null
+++ b/arch/arm/mach-gemini/time.c
@@ -0,0 +1,89 @@
+/*
+ *  Copyright (C) 2001-2006 Storlink, Corp.
+ *  Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <mach/hardware.h>
+#include <mach/global_reg.h>
+#include <asm/mach/time.h>
+
+/*
+ * Register definitions for the timers
+ */
+#define TIMER_COUNT(BASE_ADDR)		(BASE_ADDR  + 0x00)
+#define TIMER_LOAD(BASE_ADDR)		(BASE_ADDR  + 0x04)
+#define TIMER_MATCH1(BASE_ADDR)		(BASE_ADDR  + 0x08)
+#define TIMER_MATCH2(BASE_ADDR)		(BASE_ADDR  + 0x0C)
+#define TIMER_CR(BASE_ADDR)		(BASE_ADDR  + 0x30)
+
+#define TIMER_1_CR_ENABLE		(1 << 0)
+#define TIMER_1_CR_CLOCK		(1 << 1)
+#define TIMER_1_CR_INT			(1 << 2)
+#define TIMER_2_CR_ENABLE		(1 << 3)
+#define TIMER_2_CR_CLOCK		(1 << 4)
+#define TIMER_2_CR_INT			(1 << 5)
+#define TIMER_3_CR_ENABLE		(1 << 6)
+#define TIMER_3_CR_CLOCK		(1 << 7)
+#define TIMER_3_CR_INT			(1 << 8)
+
+/*
+ * IRQ handler for the timer
+ */
+static irqreturn_t gemini_timer_interrupt(int irq, void *dev_id)
+{
+	timer_tick();
+
+	return IRQ_HANDLED;
+}
+
+static struct irqaction gemini_timer_irq = {
+	.name		= "Gemini Timer Tick",
+	.flags		= IRQF_DISABLED | IRQF_TIMER,
+	.handler	= gemini_timer_interrupt,
+};
+
+/*
+ * Set up timer interrupt, and return the current time in seconds.
+ */
+void __init gemini_timer_init(void)
+{
+	unsigned int tick_rate, reg_v;
+
+	reg_v = __raw_readl(IO_ADDRESS(GEMINI_GLOBAL_BASE + GLOBAL_STATUS));
+	tick_rate = REG_TO_AHB_SPEED(reg_v) * 1000000;
+
+	printk(KERN_INFO "Bus: %dMHz", tick_rate / 1000000);
+
+	tick_rate /= 6;		/* APB bus run AHB*(1/6) */
+
+	switch(reg_v & CPU_AHB_RATIO_MASK) {
+	case CPU_AHB_1_1:
+		printk(KERN_CONT "(1/1)\n");
+		break;
+	case CPU_AHB_3_2:
+		printk(KERN_CONT "(3/2)\n");
+		break;
+	case CPU_AHB_24_13:
+		printk(KERN_CONT "(24/13)\n");
+		break;
+	case CPU_AHB_2_1:
+		printk(KERN_CONT "(2/1)\n");
+		break;
+	}
+
+	/*
+	 * Make irqs happen for the system timer
+	 */
+	setup_irq(IRQ_TIMER2, &gemini_timer_irq);
+	/* Start the timer */
+	__raw_writel(tick_rate / HZ, TIMER_COUNT(IO_ADDRESS(GEMINI_TIMER2_BASE)));
+	__raw_writel(tick_rate / HZ, TIMER_LOAD(IO_ADDRESS(GEMINI_TIMER2_BASE)));
+	__raw_writel(TIMER_2_CR_ENABLE | TIMER_2_CR_INT, TIMER_CR(IO_ADDRESS(GEMINI_TIMER_BASE)));
+}