From 5f97f7f9400de47ae837170bb274e90ad3934386 Mon Sep 17 00:00:00 2001 From: Haavard Skinnemoen Date: Mon, 25 Sep 2006 23:32:13 -0700 Subject: [PATCH] avr32 architecture This adds support for the Atmel AVR32 architecture as well as the AT32AP7000 CPU and the AT32STK1000 development board. AVR32 is a new high-performance 32-bit RISC microprocessor core, designed for cost-sensitive embedded applications, with particular emphasis on low power consumption and high code density. The AVR32 architecture is not binary compatible with earlier 8-bit AVR architectures. The AVR32 architecture, including the instruction set, is described by the AVR32 Architecture Manual, available from http://www.atmel.com/dyn/resources/prod_documents/doc32000.pdf The Atmel AT32AP7000 is the first CPU implementing the AVR32 architecture. It features a 7-stage pipeline, 16KB instruction and data caches and a full Memory Management Unit. It also comes with a large set of integrated peripherals, many of which are shared with the AT91 ARM-based controllers from Atmel. Full data sheet is available from http://www.atmel.com/dyn/resources/prod_documents/doc32003.pdf while the CPU core implementation including caches and MMU is documented by the AVR32 AP Technical Reference, available from http://www.atmel.com/dyn/resources/prod_documents/doc32001.pdf Information about the AT32STK1000 development board can be found at http://www.atmel.com/dyn/products/tools_card.asp?tool_id=3918 including a BSP CD image with an earlier version of this patch, development tools (binaries and source/patches) and a root filesystem image suitable for booting from SD card. Alternatively, there's a preliminary "getting started" guide available at http://avr32linux.org/twiki/bin/view/Main/GettingStarted which provides links to the sources and patches you will need in order to set up a cross-compiling environment for avr32-linux. This patch, as well as the other patches included with the BSP and the toolchain patches, is actively supported by Atmel Corporation. [dmccr@us.ibm.com: Fix more pxx_page macro locations] [bunk@stusta.de: fix `make defconfig'] Signed-off-by: Haavard Skinnemoen Signed-off-by: Adrian Bunk Signed-off-by: Dave McCracken Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-avr32/timex.h | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 include/asm-avr32/timex.h (limited to 'include/asm-avr32/timex.h') diff --git a/include/asm-avr32/timex.h b/include/asm-avr32/timex.h new file mode 100644 index 000000000000..5e44ecb3ce0c --- /dev/null +++ b/include/asm-avr32/timex.h @@ -0,0 +1,40 @@ +/* + * Copyright (C) 2004-2006 Atmel Corporation + * + * 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. + */ +#ifndef __ASM_AVR32_TIMEX_H +#define __ASM_AVR32_TIMEX_H + +/* + * This is the frequency of the timer used for Linux's timer interrupt. + * The value should be defined as accurate as possible or under certain + * circumstances Linux timekeeping might become inaccurate or fail. + * + * For many system the exact clockrate of the timer isn't known but due to + * the way this value is used we can get away with a wrong value as long + * as this value is: + * + * - a multiple of HZ + * - a divisor of the actual rate + * + * 500000 is a good such cheat value. + * + * The obscure number 1193182 is the same as used by the original i8254 + * time in legacy PC hardware; the chip is never found in AVR32 systems. + */ +#define CLOCK_TICK_RATE 500000 /* Underlying HZ */ + +typedef unsigned long cycles_t; + +static inline cycles_t get_cycles (void) +{ + return 0; +} + +extern int read_current_timer(unsigned long *timer_value); +#define ARCH_HAS_READ_CURRENT_TIMER 1 + +#endif /* __ASM_AVR32_TIMEX_H */ -- cgit v1.2.2