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>

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"

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

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

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

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

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__ */

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);
+}

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>

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