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>

21 files changed, 1033 insertions, 0 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index dbfdf87f993..5686f4074dd 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -275,6 +275,12 @@ config ARCH_EP93XX
 	help
 	  This enables support for the Cirrus EP93xx series of CPUs.
 
+config ARCH_GEMINI
+	bool "Cortina Systems Gemini"
+	select CPU_FA526
+	help
+	  Support for the Cortina Systems Gemini family SoCs
+
 config ARCH_FOOTBRIDGE
 	bool "FootBridge"
 	select CPU_SA110
@@ -598,6 +604,8 @@ source "arch/arm/mach-ep93xx/Kconfig"
 
 source "arch/arm/mach-footbridge/Kconfig"
 
+source "arch/arm/mach-gemini/Kconfig"
+
 source "arch/arm/mach-integrator/Kconfig"
 
 source "arch/arm/mach-iop32x/Kconfig"
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index d29f9260fb1..56e13bf2202 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -108,6 +108,7 @@ endif
  machine-$(CONFIG_ARCH_PXA)	   := pxa
  machine-$(CONFIG_ARCH_L7200)	   := l7200
  machine-$(CONFIG_ARCH_INTEGRATOR) := integrator
+ machine-$(CONFIG_ARCH_GEMINI)     := gemini
  textofs-$(CONFIG_ARCH_CLPS711X)   := 0x00028000
  machine-$(CONFIG_ARCH_CLPS711X)   := clps711x
  machine-$(CONFIG_ARCH_IOP32X)	   := iop32x
diff --git a/arch/arm/mach-gemini/Kconfig b/arch/arm/mach-gemini/Kconfig
new file mode 100644
index 00000000000..3aff39abb18
--- /dev/null
+++ b/arch/arm/mach-gemini/Kconfig
@@ -0,0 +1,12 @@
+if ARCH_GEMINI
+
+menu "Cortina Systems Gemini Implementations"
+
+endmenu
+
+config GEMINI_MEM_SWAP
+	bool "Gemini memory is swapped"
+	help
+	  Say Y here if Gemini memory is swapped by bootloader.
+
+endif
diff --git a/arch/arm/mach-gemini/Makefile b/arch/arm/mach-gemini/Makefile
new file mode 100644
index 00000000000..133e2050685
--- /dev/null
+++ b/arch/arm/mach-gemini/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the linux kernel.
+#
+
+# Object file lists.
+
+obj-y			:= irq.o mm.o time.o devices.o
diff --git a/arch/arm/mach-gemini/Makefile.boot b/arch/arm/mach-gemini/Makefile.boot
new file mode 100644
index 00000000000..22a52c228d9
--- /dev/null
+++ b/arch/arm/mach-gemini/Makefile.boot
@@ -0,0 +1,9 @@
+ifeq ($(CONFIG_GEMINI_MEM_SWAP),y)
+   zreladdr-y	:= 0x00008000
+params_phys-y	:= 0x00000100
+initrd_phys-y	:= 0x00800000
+else
+   zreladdr-y	:= 0x10008000
+params_phys-y	:= 0x10000100
+initrd_phys-y	:= 0x10800000
+endif
diff --git a/arch/arm/mach-gemini/common.h b/arch/arm/mach-gemini/common.h
new file mode 100644
index 00000000000..9c1afa1c580
--- /dev/null
+++ b/arch/arm/mach-gemini/common.h
@@ -0,0 +1,27 @@
+/*
+ * Common Gemini architecture functions
+ *
+ * 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.
+ */
+
+#ifndef __GEMINI_COMMON_H__
+#define __GEMINI_COMMON_H__
+
+struct mtd_partition;
+
+extern void gemini_map_io(void);
+extern void gemini_init_irq(void);
+extern void gemini_timer_init(void);
+
+/* Common platform devices registration functions */
+extern int platform_register_uart(void);
+extern int platform_register_pflash(unsigned int size,
+				    struct mtd_partition *parts,
+				    unsigned int nr_parts);
+
+#endif /* __GEMINI_COMMON_H__ */
diff --git a/arch/arm/mach-gemini/devices.c b/arch/arm/mach-gemini/devices.c
new file mode 100644
index 00000000000..6b525253d02
--- /dev/null
+++ b/arch/arm/mach-gemini/devices.c
@@ -0,0 +1,92 @@
+/*
+ * Common devices definition for Gemini
+ *
+ * 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 version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/serial_8250.h>
+#include <linux/mtd/physmap.h>
+
+#include <mach/irqs.h>
+#include <mach/hardware.h>
+#include <mach/global_reg.h>
+
+static struct plat_serial8250_port serial_platform_data[] = {
+	{
+		.membase	= (void *)IO_ADDRESS(GEMINI_UART_BASE),
+		.mapbase	= GEMINI_UART_BASE,
+		.irq		= IRQ_UART,
+		.uartclk	= UART_CLK,
+		.regshift	= 2,
+		.iotype		= UPIO_MEM,
+		.type		= PORT_16550A,
+		.flags		= UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_FIXED_TYPE,
+	},
+	{},
+};
+
+static struct platform_device serial_device = {
+	.name	= "serial8250",
+	.id	= PLAT8250_DEV_PLATFORM,
+	.dev	= {
+		.platform_data = serial_platform_data,
+	},
+};
+
+int platform_register_uart(void)
+{
+	return platform_device_register(&serial_device);
+}
+
+static struct resource flash_resource = {
+	.start	= GEMINI_FLASH_BASE,
+	.flags	= IORESOURCE_MEM,
+};
+
+static struct physmap_flash_data pflash_platform_data = {};
+
+static struct platform_device pflash_device = {
+	.name	= "physmap-flash",
+	.id	= 0,
+	.dev 	= {
+		.platform_data = &pflash_platform_data,
+	},
+	.resource = &flash_resource,
+	.num_resources = 1,
+};
+
+int platform_register_pflash(unsigned int size, struct mtd_partition *parts,
+			     unsigned int nr_parts)
+{
+	unsigned int reg;
+
+	reg = __raw_readl(IO_ADDRESS(GEMINI_GLOBAL_BASE) + GLOBAL_STATUS);
+
+	if ((reg & FLASH_TYPE_MASK) != FLASH_TYPE_PARALLEL)
+		return -ENXIO;
+
+	if (reg & FLASH_WIDTH_16BIT)
+		pflash_platform_data.width = 2;
+	else
+		pflash_platform_data.width = 1;
+
+	/* enable parallel flash pins and disable others */
+	reg = __raw_readl(IO_ADDRESS(GEMINI_GLOBAL_BASE) + GLOBAL_MISC_CTRL);
+	reg &= ~PFLASH_PADS_DISABLE;
+	reg |= SFLASH_PADS_DISABLE | NAND_PADS_DISABLE;
+	__raw_writel(reg, IO_ADDRESS(GEMINI_GLOBAL_BASE) + GLOBAL_MISC_CTRL);
+
+	flash_resource.end = flash_resource.start + size - 1;
+
+	pflash_platform_data.parts = parts;
+	pflash_platform_data.nr_parts = nr_parts;
+
+	return platform_device_register(&pflash_device);
+}
diff --git a/arch/arm/mach-gemini/include/mach/debug-macro.S b/arch/arm/mach-gemini/include/mach/debug-macro.S
new file mode 100644
index 00000000000..d04a6eaeae1
--- /dev/null
+++ b/arch/arm/mach-gemini/include/mach/debug-macro.S
@@ -0,0 +1,23 @@
+/*
+ * Debugging macro include header
+ *
+ *  Copyright (C) 1994-1999 Russell King
+ *  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 version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <mach/hardware.h>
+
+	.macro	addruart,rx
+	mrc	p15, 0, \rx, c1, c0
+	tst	\rx, #1					@ MMU enabled?
+	ldreq	\rx, =GEMINI_UART_BASE			@ physical
+	ldrne	\rx, =IO_ADDRESS(GEMINI_UART_BASE)	@ virtual
+	.endm
+
+#define UART_SHIFT	2
+#define FLOW_CONTROL
+#include <asm/hardware/debug-8250.S>
diff --git a/arch/arm/mach-gemini/include/mach/entry-macro.S b/arch/arm/mach-gemini/include/mach/entry-macro.S
new file mode 100644
index 00000000000..1624f91a2b8
--- /dev/null
+++ b/arch/arm/mach-gemini/include/mach/entry-macro.S
@@ -0,0 +1,39 @@
+/*
+ * Low-level IRQ helper macros for Gemini platform.
+ *
+ *  Copyright (C) 2001-2006 Storlink, Corp.
+ *  Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
+ *
+ * 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 <mach/hardware.h>
+
+#define IRQ_STATUS	0x14
+
+	.macro  disable_fiq
+	.endm
+
+	.macro  get_irqnr_preamble, base, tmp
+	.endm
+
+	.macro  arch_ret_to_user, tmp1, tmp2
+	.endm
+
+	.macro  get_irqnr_and_base, irqnr, irqstat, base, tmp
+	ldr     \irqstat, =IO_ADDRESS(GEMINI_INTERRUPT_BASE + IRQ_STATUS)
+	ldr     \irqnr, [\irqstat]
+	cmp     \irqnr, #0
+	beq     2313f
+	mov     \tmp, \irqnr
+	mov     \irqnr, #0
+2312:
+	tst     \tmp, #1
+	bne     2313f
+	add     \irqnr, \irqnr, #1
+	mov     \tmp, \tmp, lsr #1
+	cmp     \irqnr, #31
+	bcc     2312b
+2313:
+	.endm
diff --git a/arch/arm/mach-gemini/include/mach/global_reg.h b/arch/arm/mach-gemini/include/mach/global_reg.h
new file mode 100644
index 00000000000..de7ff7e849f
--- /dev/null
+++ b/arch/arm/mach-gemini/include/mach/global_reg.h
@@ -0,0 +1,278 @@
+/*
+ *  This file contains the hardware definitions for Gemini.
+ *
+ *  Copyright (C) 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.
+ */
+#ifndef __MACH_GLOBAL_REG_H
+#define __MACH_GLOBAL_REG_H
+
+/* Global Word ID Register*/
+#define GLOBAL_ID			0x00
+
+#define CHIP_ID(reg)			((reg) >> 8)
+#define CHIP_REVISION(reg)		((reg) & 0xFF)
+
+/* Global Status Register */
+#define GLOBAL_STATUS			0x04
+
+#define CPU_BIG_ENDIAN			(1 << 31)
+#define PLL_OSC_30M			(1 << 30)	/* else 60MHz */
+
+#define OPERATION_MODE_MASK		(0xF << 26)
+#define OPM_IDDQ			(0xF << 26)
+#define OPM_NAND			(0xE << 26)
+#define OPM_RING			(0xD << 26)
+#define OPM_DIRECT_BOOT			(0xC << 26)
+#define OPM_USB1_PHY_TEST		(0xB << 26)
+#define OPM_USB0_PHY_TEST		(0xA << 26)
+#define OPM_SATA1_PHY_TEST		(0x9 << 26)
+#define OPM_SATA0_PHY_TEST		(0x8 << 26)
+#define OPM_ICE_ARM			(0x7 << 26)
+#define OPM_ICE_FARADAY			(0x6 << 26)
+#define OPM_PLL_BYPASS			(0x5 << 26)
+#define OPM_DEBUG			(0x4 << 26)
+#define OPM_BURN_IN			(0x3 << 26)
+#define OPM_MBIST			(0x2 << 26)
+#define OPM_SCAN			(0x1 << 26)
+#define OPM_REAL			(0x0 << 26)
+
+#define FLASH_TYPE_MASK			(0x3 << 24)
+#define FLASH_TYPE_NAND_2K		(0x3 << 24)
+#define FLASH_TYPE_NAND_512		(0x2 << 24)
+#define FLASH_TYPE_PARALLEL		(0x1 << 24)
+#define FLASH_TYPE_SERIAL		(0x0 << 24)
+/* if parallel */
+#define FLASH_WIDTH_16BIT		(1 << 23)	/* else 8 bit */
+/* if serial */
+#define FLASH_ATMEL			(1 << 23)	/* else STM */
+
+#define FLASH_SIZE_MASK			(0x3 << 21)
+#define NAND_256M			(0x3 << 21)	/* and more */
+#define NAND_128M			(0x2 << 21)
+#define NAND_64M			(0x1 << 21)
+#define NAND_32M			(0x0 << 21)
+#define ATMEL_16M			(0x3 << 21)	/* and more */
+#define ATMEL_8M			(0x2 << 21)
+#define ATMEL_4M_2M			(0x1 << 21)
+#define ATMEL_1M			(0x0 << 21)	/* and less */
+#define STM_32M				(1 << 22)	/* and more */
+#define STM_16M				(0 << 22)	/* and less */
+
+#define FLASH_PARALLEL_HIGH_PIN_CNT	(1 << 20)	/* else low pin cnt */
+
+#define CPU_AHB_RATIO_MASK		(0x3 << 18)
+#define CPU_AHB_1_1			(0x0 << 18)
+#define CPU_AHB_3_2			(0x1 << 18)
+#define CPU_AHB_24_13			(0x2 << 18)
+#define CPU_AHB_2_1			(0x3 << 18)
+
+#define REG_TO_AHB_SPEED(reg)		((((reg) >> 15) & 0x7) * 10 + 130)
+#define AHB_SPEED_TO_REG(x)		((((x - 130)) / 10) << 15)
+
+/* it is posible to override some settings, use >> OVERRIDE_xxxx_SHIFT */
+#define OVERRIDE_FLASH_TYPE_SHIFT	16
+#define OVERRIDE_FLASH_WIDTH_SHIFT	16
+#define OVERRIDE_FLASH_SIZE_SHIFT	16
+#define OVERRIDE_CPU_AHB_RATIO_SHIFT	15
+#define OVERRIDE_AHB_SPEED_SHIFT	15
+
+/* Global PLL Control Register */
+#define GLOBAL_PLL_CTRL			0x08
+
+#define PLL_BYPASS			(1 << 31)
+#define PLL_POWER_DOWN			(1 << 8)
+#define PLL_CONTROL_Q			(0x1F << 0)
+
+/* Global Soft Reset Control Register */
+#define GLOBAL_RESET			0x0C
+
+#define RESET_GLOBAL			(1 << 31)
+#define RESET_CPU1			(1 << 30)
+#define RESET_TVE			(1 << 28)
+#define RESET_SATA1			(1 << 27)
+#define RESET_SATA0			(1 << 26)
+#define RESET_CIR			(1 << 25)
+#define RESET_EXT_DEV			(1 << 24)
+#define RESET_WD			(1 << 23)
+#define RESET_GPIO2			(1 << 22)
+#define RESET_GPIO1			(1 << 21)
+#define RESET_GPIO0			(1 << 20)
+#define RESET_SSP			(1 << 19)
+#define RESET_UART			(1 << 18)
+#define RESET_TIMER			(1 << 17)
+#define RESET_RTC			(1 << 16)
+#define RESET_INT1			(1 << 15)
+#define RESET_INT0			(1 << 14)
+#define RESET_LCD			(1 << 13)
+#define RESET_LPC			(1 << 12)
+#define RESET_APB			(1 << 11)
+#define RESET_DMA			(1 << 10)
+#define RESET_USB1			(1 << 9)
+#define RESET_USB0			(1 << 8)
+#define RESET_PCI			(1 << 7)
+#define RESET_GMAC1			(1 << 6)
+#define RESET_GMAC0			(1 << 5)
+#define RESET_SECURITY			(1 << 4)
+#define RESET_RAID			(1 << 3)
+#define RESET_IDE			(1 << 2)
+#define RESET_FLASH			(1 << 1)
+#define RESET_DRAM			(1 << 0)
+
+/* Global IO Pad Driving Capability Control Register */
+#define GLOBAL_IO_DRIVING_CTRL		0x10
+
+#define DRIVING_CURRENT_MASK		0x3
+
+/* here 00-4mA, 01-8mA, 10-12mA, 11-16mA */
+#define GPIO1_PADS_31_28_SHIFT		28
+#define GPIO0_PADS_31_16_SHIFT		26
+#define GPIO0_PADS_15_0_SHIFT		24
+#define PCI_AND_EXT_RESET_PADS_SHIFT	22
+#define IDE_PADS_SHIFT			20
+#define GMAC1_PADS_SHIFT		18
+#define GMAC0_PADS_SHIFT		16
+/* DRAM is not in mA and poorly documented */
+#define DRAM_CLOCK_PADS_SHIFT		8
+#define DRAM_DATA_PADS_SHIFT		4
+#define DRAM_CONTROL_PADS_SHIFT		0
+
+/* Global IO Pad Slew Rate Control Register */
+#define GLOBAL_IO_SLEW_RATE_CTRL	0x14
+
+#define GPIO1_PADS_31_28_SLOW		(1 << 10)
+#define GPIO0_PADS_31_16_SLOW		(1 << 9)
+#define GPIO0_PADS_15_0_SLOW		(1 << 8)
+#define PCI_PADS_SLOW			(1 << 7)
+#define IDE_PADS_SLOW			(1 << 6)
+#define GMAC1_PADS_SLOW			(1 << 5)
+#define GMAC0_PADS_SLOW			(1 << 4)
+#define DRAM_CLOCK_PADS_SLOW		(1 << 1)
+#define DRAM_IO_PADS_SLOW		(1 << 0)
+
+/*
+ * General skew control defines
+ * 16 steps, each step is around 0.2ns
+ */
+#define SKEW_MASK			0xF
+
+/* Global IDE PAD Skew Control Register */
+#define GLOBAL_IDE_SKEW_CTRL		0x18
+
+#define IDE1_HOST_STROBE_DELAY_SHIFT	28
+#define IDE1_DEVICE_STROBE_DELAY_SHIFT	24
+#define IDE1_OUTPUT_IO_SKEW_SHIFT	20
+#define IDE1_INPUT_IO_SKEW_SHIFT	16
+#define IDE0_HOST_STROBE_DELAY_SHIFT	12
+#define IDE0_DEVICE_STROBE_DELAY_SHIFT	8
+#define IDE0_OUTPUT_IO_SKEW_SHIFT	4
+#define IDE0_INPUT_IO_SKEW_SHIFT	0
+
+/* Global GMAC Control Pad Skew Control Register */
+#define GLOBAL_GMAC_CTRL_SKEW_CTRL	0x1C
+
+#define GMAC1_TXC_SKEW_SHIFT		28
+#define GMAC1_TXEN_SKEW_SHIFT		24
+#define GMAC1_RXC_SKEW_SHIFT		20
+#define GMAC1_RXDV_SKEW_SHIFT		16
+#define GMAC0_TXC_SKEW_SHIFT		12
+#define GMAC0_TXEN_SKEW_SHIFT		8
+#define GMAC0_RXC_SKEW_SHIFT		4
+#define GMAC0_RXDV_SKEW_SHIFT		0
+
+/* Global GMAC0 Data PAD Skew Control Register */
+#define GLOBAL_GMAC0_DATA_SKEW_CTRL	0x20
+/* Global GMAC1 Data PAD Skew Control Register */
+#define GLOBAL_GMAC1_DATA_SKEW_CTRL	0x24
+
+#define GMAC_TXD_SKEW_SHIFT(x)		(((x) * 4) + 16)
+#define GMAC_RXD_SKEW_SHIFT(x)		((x) * 4)
+
+/* CPU has two AHB busses. */
+
+/* Global Arbitration0 Control Register */
+#define GLOBAL_ARBITRATION0_CTRL	0x28
+
+#define BOOT_CONTROLLER_HIGH_PRIO	(1 << 3)
+#define DMA_BUS1_HIGH_PRIO		(1 << 2)
+#define CPU0_HIGH_PRIO			(1 << 0)
+
+/* Global Arbitration1 Control Register */
+#define GLOBAL_ARBITRATION1_CTRL	0x2C
+
+#define TVE_HIGH_PRIO			(1 << 9)
+#define PCI_HIGH_PRIO			(1 << 8)
+#define USB1_HIGH_PRIO			(1 << 7)
+#define USB0_HIGH_PRIO			(1 << 6)
+#define GMAC1_HIGH_PRIO			(1 << 5)
+#define GMAC0_HIGH_PRIO			(1 << 4)
+#define SECURITY_HIGH_PRIO		(1 << 3)
+#define RAID_HIGH_PRIO			(1 << 2)
+#define IDE_HIGH_PRIO			(1 << 1)
+#define DMA_BUS2_HIGH_PRIO		(1 << 0)
+
+/* Common bits for both arbitration registers */
+#define BURST_LENGTH_SHIFT		16
+#define BURST_LENGTH_MASK		(0x3F << 16)
+
+/* Miscellaneous Control Register */
+#define GLOBAL_MISC_CTRL		0x30
+
+#define MEMORY_SPACE_SWAP		(1 << 31)
+#define USB1_PLUG_MINIB			(1 << 30) /* else plug is mini-A */
+#define USB0_PLUG_MINIB			(1 << 29)
+#define GMAC_GMII			(1 << 28)
+#define GMAC_1_ENABLE			(1 << 27)
+/* TODO: define ATA/SATA bits */
+#define USB1_VBUS_ON			(1 << 23)
+#define USB0_VBUS_ON			(1 << 22)
+#define APB_CLKOUT_ENABLE		(1 << 21)
+#define TVC_CLKOUT_ENABLE		(1 << 20)
+#define EXT_CLKIN_ENABLE		(1 << 19)
+#define PCI_66MHZ			(1 << 18) /* else 33 MHz */
+#define PCI_CLKOUT_ENABLE		(1 << 17)
+#define LPC_CLKOUT_ENABLE		(1 << 16)
+#define USB1_WAKEUP_ON			(1 << 15)
+#define USB0_WAKEUP_ON			(1 << 14)
+/* TODO: define PCI idle detect bits */
+#define TVC_PADS_ENABLE			(1 << 9)
+#define SSP_PADS_ENABLE			(1 << 8)
+#define LCD_PADS_ENABLE			(1 << 7)
+#define LPC_PADS_ENABLE			(1 << 6)
+#define PCI_PADS_ENABLE			(1 << 5)
+#define IDE_PADS_ENABLE			(1 << 4)
+#define DRAM_PADS_POWER_DOWN		(1 << 3)
+#define NAND_PADS_DISABLE		(1 << 2)
+#define PFLASH_PADS_DISABLE		(1 << 1)
+#define SFLASH_PADS_DISABLE		(1 << 0)
+
+/* Global Clock Control Register */
+#define GLOBAL_CLOCK_CTRL		0x34
+
+#define POWER_STATE_G0			(1 << 31)
+#define POWER_STATE_S1			(1 << 30) /* else it is S3/S4 state */
+#define SECURITY_APB_AHB		(1 << 29)
+/* else Security APB clk will be 0.75xAHB */
+/* TODO: TVC clock divider */
+#define PCI_CLKRUN_ENABLE		(1 << 16)
+#define BOOT_CLK_DISABLE		(1 << 13)
+#define TVC_CLK_DISABLE			(1 << 12)
+#define FLASH_CLK_DISABLE		(1 << 11)
+#define DDR_CLK_DISABLE			(1 << 10)
+#define PCI_CLK_DISABLE			(1 << 9)
+#define IDE_CLK_DISABLE			(1 << 8)
+#define USB1_CLK_DISABLE		(1 << 7)
+#define USB0_CLK_DISABLE		(1 << 6)
+#define SATA1_CLK_DISABLE		(1 << 5)
+#define SATA0_CLK_DISABLE		(1 << 4)
+#define GMAC1_CLK_DISABLE		(1 << 3)
+#define GMAC0_CLK_DISABLE		(1 << 2)
+#define SECURITY_CLK_DISABLE		(1 << 1)
+
+/* TODO: other registers definitions if needed */
+
+#endif /* __MACH_GLOBAL_REG_H */
diff --git a/arch/arm/mach-gemini/include/mach/hardware.h b/arch/arm/mach-gemini/include/mach/hardware.h
new file mode 100644
index 00000000000..de6752674c0
--- /dev/null
+++ b/arch/arm/mach-gemini/include/mach/hardware.h
@@ -0,0 +1,75 @@
+/*
+ *  This file contains the hardware definitions for Gemini.
+ *
+ *  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.
+ */
+#ifndef __MACH_HARDWARE_H
+#define __MACH_HARDWARE_H
+
+/*
+ * Memory Map definitions
+ */
+/* FIXME: Does it really swap SRAM like this? */
+#ifdef CONFIG_GEMINI_MEM_SWAP
+# define GEMINI_DRAM_BASE	0x00000000
+# define GEMINI_SRAM_BASE	0x20000000
+#else
+# define GEMINI_SRAM_BASE	0x00000000
+# define GEMINI_DRAM_BASE	0x10000000
+#endif
+#define GEMINI_FLASH_BASE	0x30000000
+#define GEMINI_GLOBAL_BASE	0x40000000
+#define GEMINI_WAQTCHDOG_BASE	0x41000000
+#define GEMINI_UART_BASE	0x42000000
+#define GEMINI_TIMER_BASE	0x43000000
+#define GEMINI_LCD_BASE		0x44000000
+#define GEMINI_RTC_BASE		0x45000000
+#define GEMINI_SATA_BASE	0x46000000
+#define GEMINI_LPC_HOST_BASE	0x47000000
+#define GEMINI_LPC_IO_BASE	0x47800000
+#define GEMINI_INTERRUPT_BASE	0x48000000
+/* TODO: Different interrupt controlers when SMP
+ * #define GEMINI_INTERRUPT0_BASE	0x48000000
+ * #define GEMINI_INTERRUPT1_BASE	0x49000000
+ */
+#define GEMINI_SSP_CTRL_BASE	0x4A000000
+#define GEMINI_POWER_CTRL_BASE	0x4B000000
+#define GEMINI_CIR_BASE		0x4C000000
+#define GEMINI_GPIO_BASE(x)	(0x4D000000 + (x) * 0x1000000)
+#define GEMINI_PCI_IO_BASE	0x50000000
+#define GEMINI_PCI_MEM_BASE	0x58000000
+#define GEMINI_TOE_BASE		0x60000000
+#define GEMINI_GMAC0_BASE	0x6000A000
+#define GEMINI_GMAC1_BASE	0x6000E000
+#define GEMINI_SECURITY_BASE	0x62000000
+#define GEMINI_IDE0_BASE	0x63000000
+#define GEMINI_IDE1_BASE	0x63400000
+#define GEMINI_RAID_BASE	0x64000000
+#define GEMINI_FLASH_CTRL_BASE	0x65000000
+#define GEMINI_DRAM_CTRL_BASE	0x66000000
+#define GEMINI_GENERAL_DMA_BASE	0x67000000
+#define GEMINI_USB0_BASE	0x68000000
+#define GEMINI_USB1_BASE	0x69000000
+#define GEMINI_BIG_ENDIAN_BASE	0x80000000
+
+#define GEMINI_TIMER1_BASE	GEMINI_TIMER_BASE
+#define GEMINI_TIMER2_BASE	(GEMINI_TIMER_BASE + 0x10)
+#define GEMINI_TIMER3_BASE	(GEMINI_TIMER_BASE + 0x20)
+
+/*
+ * UART Clock when System clk is 150MHz
+ */
+#define UART_CLK	48000000
+
+/*
+ * macro to get at IO space when running virtually
+ */
+#define IO_ADDRESS(x)	((((x) & 0xFFF00000) >> 4) | ((x) & 0x000FFFFF) | 0xF0000000)
+
+#endif
diff --git a/arch/arm/mach-gemini/include/mach/io.h b/arch/arm/mach-gemini/include/mach/io.h
new file mode 100644
index 00000000000..c548056b98b
--- /dev/null
+++ b/arch/arm/mach-gemini/include/mach/io.h
@@ -0,0 +1,18 @@
+/*
+ *  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.
+ */
+#ifndef __MACH_IO_H
+#define __MACH_IO_H
+
+#define IO_SPACE_LIMIT	0xffffffff
+
+#define __io(a)		__typesafe_io(a)
+#define __mem_pci(a)	(a)
+
+#endif /* __MACH_IO_H */
diff --git a/arch/arm/mach-gemini/include/mach/irqs.h b/arch/arm/mach-gemini/include/mach/irqs.h
new file mode 100644
index 00000000000..c7728ac458f
--- /dev/null
+++ b/arch/arm/mach-gemini/include/mach/irqs.h
@@ -0,0 +1,50 @@
+/*
+ *  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.
+ */
+
+#ifndef __MACH_IRQS_H__
+#define __MACH_IRQS_H__
+
+#define IRQ_SERIRQ1	31
+#define IRQ_SERIRQ0	30
+#define IRQ_PCID	29
+#define IRQ_PCIC	28
+#define IRQ_PCIB	27
+#define IRQ_PWR		26
+#define IRQ_CIR		25
+#define IRQ_GPIO(x)	(22 + (x))
+#define IRQ_SSP		21
+#define IRQ_LPC		20
+#define IRQ_LCD		19
+#define IRQ_UART	18
+#define IRQ_RTC		17
+#define IRQ_TIMER3	16
+#define IRQ_TIMER2	15
+#define IRQ_TIMER1	14
+#define IRQ_FLASH	12
+#define IRQ_USB1	11
+#define IRQ_USB0	10
+#define IRQ_DMA		9
+#define IRQ_PCI		8
+#define IRQ_IPSEC	7
+#define IRQ_RAID	6
+#define IRQ_IDE1	5
+#define IRQ_IDE0	4
+#define IRQ_WATCHDOG	3
+#define IRQ_GMAC1	2
+#define IRQ_GMAC0	1
+#define IRQ_IPI		0
+
+#define NORMAL_IRQ_NUM	32
+
+#define ARCH_TIMER_IRQ	IRQ_TIMER2
+
+#define NR_IRQS		NORMAL_IRQ_NUM
+
+#endif /* __MACH_IRQS_H__ */
diff --git a/arch/arm/mach-gemini/include/mach/memory.h b/arch/arm/mach-gemini/include/mach/memory.h
new file mode 100644
index 00000000000..2d14d5bf1f9
--- /dev/null
+++ b/arch/arm/mach-gemini/include/mach/memory.h
@@ -0,0 +1,19 @@
+/*
+ *  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.
+ */
+#ifndef __MACH_MEMORY_H
+#define __MACH_MEMORY_H
+
+#ifdef CONFIG_GEMINI_MEM_SWAP
+# define PHYS_OFFSET	UL(0x00000000)
+#else
+# define PHYS_OFFSET	UL(0x10000000)
+#endif
+
+#endif /* __MACH_MEMORY_H */
diff --git a/arch/arm/mach-gemini/include/mach/system.h b/arch/arm/mach-gemini/include/mach/system.h
new file mode 100644
index 00000000000..bbbd72767a0
--- /dev/null
+++ b/arch/arm/mach-gemini/include/mach/system.h
@@ -0,0 +1,37 @@
+/*
+ *  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.
+ */
+#ifndef __MACH_SYSTEM_H
+#define __MACH_SYSTEM_H
+
+#include <linux/io.h>
+#include <mach/hardware.h>
+#include <mach/global_reg.h>
+
+static inline void arch_idle(void)
+{
+	/*
+	 * Because of broken hardware we have to enable interrupts or the CPU
+	 * will never wakeup... Acctualy it is not very good to enable
+	 * interrupts here since scheduler can miss a tick, but there is
+	 * no other way around this. Platforms that needs it for power saving
+	 * should call enable_hlt() in init code, since by default it is
+	 * disabled.
+	 */
+	local_irq_enable();
+	cpu_do_idle();
+}
+
+static inline void arch_reset(char mode)
+{
+	__raw_writel(RESET_GLOBAL | RESET_CPU1,
+		     IO_ADDRESS(GEMINI_GLOBAL_BASE) + GLOBAL_RESET);
+}
+
+#endif /* __MACH_SYSTEM_H */
diff --git a/arch/arm/mach-gemini/include/mach/timex.h b/arch/arm/mach-gemini/include/mach/timex.h
new file mode 100644
index 00000000000..dc5690ba975
--- /dev/null
+++ b/arch/arm/mach-gemini/include/mach/timex.h
@@ -0,0 +1,13 @@
+/*
+ * Gemini timex specifications
+ *
+ * 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.
+ */
+
+/* When AHB bus frequency is 150MHz */
+#define CLOCK_TICK_RATE	38000000
diff --git a/arch/arm/mach-gemini/include/mach/uncompress.h b/arch/arm/mach-gemini/include/mach/uncompress.h
new file mode 100644
index 00000000000..59c5df7e716
--- /dev/null
+++ b/arch/arm/mach-gemini/include/mach/uncompress.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
+ *
+ * Based on mach-pxa/include/mach/uncompress.h:
+ * Copyright:	(C) 2001 MontaVista Software Inc.
+ *
+ * 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.
+ */
+
+#ifndef __MACH_UNCOMPRESS_H
+#define __MACH_UNCOMPRESS_H
+
+#include <linux/serial_reg.h>
+#include <mach/hardware.h>
+
+static volatile unsigned long *UART = (unsigned long *)GEMINI_UART_BASE;
+
+/*
+ * The following code assumes the serial port has already been
+ * initialized by the bootloader.  If you didn't setup a port in
+ * your bootloader then nothing will appear (which might be desired).
+ */
+static inline void putc(char c)
+{
+	while (!(UART[UART_LSR] & UART_LSR_THRE))
+		barrier();
+	UART[UART_TX] = c;
+}
+
+#define flush() do { } while (0)
+
+/*
+ * nothing to do
+ */
+#define arch_decomp_setup()
+
+#define arch_decomp_wdog()
+
+#endif /* __MACH_UNCOMPRESS_H */
diff --git a/arch/arm/mach-gemini/include/mach/vmalloc.h b/arch/arm/mach-gemini/include/mach/vmalloc.h
new file mode 100644
index 00000000000..83e536d9436
--- /dev/null
+++ b/arch/arm/mach-gemini/include/mach/vmalloc.h
@@ -0,0 +1,10 @@
+/*
+ *  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.
+ */
+
+#define VMALLOC_END	0xF0000000
diff --git a/arch/arm/mach-gemini/irq.c b/arch/arm/mach-gemini/irq.c
new file mode 100644
index 00000000000..9e613ca8120
--- /dev/null
+++ b/arch/arm/mach-gemini/irq.c
@@ -0,0 +1,102 @@
+/*
+ *  Interrupt routines for Gemini
+ *
+ *  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/init.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/stddef.h>
+#include <linux/list.h>
+#include <linux/sched.h>
+#include <asm/irq.h>
+#include <asm/mach/irq.h>
+#include <mach/hardware.h>
+
+#define IRQ_SOURCE(base_addr)	(base_addr + 0x00)
+#define IRQ_MASK(base_addr)	(base_addr + 0x04)
+#define IRQ_CLEAR(base_addr)	(base_addr + 0x08)
+#define IRQ_TMODE(base_addr)	(base_addr + 0x0C)
+#define IRQ_TLEVEL(base_addr)	(base_addr + 0x10)
+#define IRQ_STATUS(base_addr)	(base_addr + 0x14)
+#define FIQ_SOURCE(base_addr)	(base_addr + 0x20)
+#define FIQ_MASK(base_addr)	(base_addr + 0x24)
+#define FIQ_CLEAR(base_addr)	(base_addr + 0x28)
+#define FIQ_TMODE(base_addr)	(base_addr + 0x2C)
+#define FIQ_LEVEL(base_addr)	(base_addr + 0x30)
+#define FIQ_STATUS(base_addr)	(base_addr + 0x34)
+
+static void gemini_ack_irq(unsigned int irq)
+{
+	__raw_writel(1 << irq, IRQ_CLEAR(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
+}
+
+static void gemini_mask_irq(unsigned int irq)
+{
+	unsigned int mask;
+
+	mask = __raw_readl(IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
+	mask &= ~(1 << irq);
+	__raw_writel(mask, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
+}
+
+static void gemini_unmask_irq(unsigned int irq)
+{
+	unsigned int mask;
+
+	mask = __raw_readl(IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
+	mask |= (1 << irq);
+	__raw_writel(mask, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
+}
+
+static struct irq_chip gemini_irq_chip = {
+	.name	= "INTC",
+	.ack	= gemini_ack_irq,
+	.mask	= gemini_mask_irq,
+	.unmask	= gemini_unmask_irq,
+};
+
+static struct resource irq_resource = {
+	.name	= "irq_handler",
+	.start	= IO_ADDRESS(GEMINI_INTERRUPT_BASE),
+	.end	= IO_ADDRESS(FIQ_STATUS(GEMINI_INTERRUPT_BASE)) + 4,
+};
+
+void __init gemini_init_irq(void)
+{
+	unsigned int i, mode = 0, level = 0;
+
+	/*
+	 * Disable arch_idle() by default since it is buggy
+	 * For more info see arch/arm/mach-gemini/include/mach/system.h
+	 */
+	disable_hlt();
+
+	request_resource(&iomem_resource, &irq_resource);
+
+	for (i = 0; i < NR_IRQS; i++) {
+		set_irq_chip(i, &gemini_irq_chip);
+		if((i >= IRQ_TIMER1 && i <= IRQ_TIMER3) || (i >= IRQ_SERIRQ0 && i <= IRQ_SERIRQ1)) {
+			set_irq_handler(i, handle_edge_irq);
+			mode |= 1 << i;
+			level |= 1 << i;
+		} else {			
+			set_irq_handler(i, handle_level_irq);
+		}
+		set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
+	}
+
+	/* Disable all interrupts */
+	__raw_writel(0, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
+	__raw_writel(0, FIQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
+
+	/* Set interrupt mode */
+	__raw_writel(mode, IRQ_TMODE(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
+	__raw_writel(level, IRQ_TLEVEL(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
+}
diff --git a/arch/arm/mach-gemini/mm.c b/arch/arm/mach-gemini/mm.c
new file mode 100644
index 00000000000..51948242ec0
--- /dev/null
+++ b/arch/arm/mach-gemini/mm.c
@@ -0,0 +1,82 @@
+/*
+ *  Static mappings for Gemini
+ *
+ *  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/mm.h>
+#include <linux/init.h>
+
+#include <asm/mach/map.h>
+
+#include <mach/hardware.h>
+
+/* Page table mapping for I/O region */
+static struct map_desc gemini_io_desc[] __initdata = {
+	{
+		.virtual	= IO_ADDRESS(GEMINI_GLOBAL_BASE),
+		.pfn		=__phys_to_pfn(GEMINI_GLOBAL_BASE),
+		.length		= SZ_512K,
+		.type 		= MT_DEVICE,
+	}, {
+		.virtual	= IO_ADDRESS(GEMINI_UART_BASE),
+		.pfn		= __phys_to_pfn(GEMINI_UART_BASE),
+		.length		= SZ_512K,
+		.type 		= MT_DEVICE,
+	}, {
+		.virtual	= IO_ADDRESS(GEMINI_TIMER_BASE),
+		.pfn		= __phys_to_pfn(GEMINI_TIMER_BASE),
+		.length		= SZ_512K,
+		.type 		= MT_DEVICE,
+	}, {
+		.virtual	= IO_ADDRESS(GEMINI_INTERRUPT_BASE),
+		.pfn		= __phys_to_pfn(GEMINI_INTERRUPT_BASE),
+		.length		= SZ_512K,
+		.type 		= MT_DEVICE,
+	}, {
+		.virtual	= IO_ADDRESS(GEMINI_POWER_CTRL_BASE),
+		.pfn		= __phys_to_pfn(GEMINI_POWER_CTRL_BASE),
+		.length		= SZ_512K,
+		.type 		= MT_DEVICE,
+	}, {
+		.virtual	= IO_ADDRESS(GEMINI_GPIO_BASE(0)),
+		.pfn		= __phys_to_pfn(GEMINI_GPIO_BASE(0)),
+		.length		= SZ_512K,
+		.type 		= MT_DEVICE,
+	}, {
+		.virtual	= IO_ADDRESS(GEMINI_GPIO_BASE(1)),
+		.pfn		= __phys_to_pfn(GEMINI_GPIO_BASE(1)),
+		.length		= SZ_512K,
+		.type 		= MT_DEVICE,
+	}, {
+		.virtual	= IO_ADDRESS(GEMINI_GPIO_BASE(2)),
+		.pfn		= __phys_to_pfn(GEMINI_GPIO_BASE(2)),
+		.length		= SZ_512K,
+		.type 		= MT_DEVICE,
+	}, {
+		.virtual	= IO_ADDRESS(GEMINI_FLASH_CTRL_BASE),
+		.pfn		= __phys_to_pfn(GEMINI_FLASH_CTRL_BASE),
+		.length		= SZ_512K,
+		.type 		= MT_DEVICE,
+	}, {
+		.virtual	= IO_ADDRESS(GEMINI_DRAM_CTRL_BASE),
+		.pfn		= __phys_to_pfn(GEMINI_DRAM_CTRL_BASE),
+		.length		= SZ_512K,
+		.type 		= MT_DEVICE,
+	}, {
+		.virtual	= IO_ADDRESS(GEMINI_GENERAL_DMA_BASE),
+		.pfn		= __phys_to_pfn(GEMINI_GENERAL_DMA_BASE),
+		.length		= SZ_512K,
+		.type 		= MT_DEVICE,
+	},
+};
+
+void __init gemini_map_io(void)
+{
+	iotable_init(gemini_io_desc, ARRAY_SIZE(gemini_io_desc));
+}
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)));
+}