[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 <hskinnemoen@atmel.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Dave McCracken <dmccr@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 118 insertions, 0 deletions

diff --git a/arch/avr32/mach-at32ap/pio.c b/arch/avr32/mach-at32ap/pio.c
new file mode 100644
index 000000000000..d3aabfca8598
--- /dev/null
+++ b/arch/avr32/mach-at32ap/pio.c
@@ -0,0 +1,118 @@
+/*
+ * Atmel PIO2 Port Multiplexer support
+ *
+ * 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.
+ */
+
+#include <linux/clk.h>
+#include <linux/debugfs.h>
+#include <linux/fs.h>
+#include <linux/platform_device.h>
+
+#include <asm/io.h>
+
+#include <asm/arch/portmux.h>
+
+#include "pio.h"
+
+#define MAX_NR_PIO_DEVICES              8
+
+struct pio_device {
+        void __iomem *regs;
+        const struct platform_device *pdev;
+        struct clk *clk;
+        u32 alloc_mask;
+        char name[32];
+};
+
+static struct pio_device pio_dev[MAX_NR_PIO_DEVICES];
+
+void portmux_set_func(unsigned int portmux_id, unsigned int pin_id,
+                      unsigned int function_id)
+{
+        struct pio_device *pio;
+        u32 mask = 1 << pin_id;
+
+        BUG_ON(portmux_id >= MAX_NR_PIO_DEVICES);
+
+        pio = &pio_dev[portmux_id];
+
+        if (function_id)
+                pio_writel(pio, BSR, mask);
+        else
+                pio_writel(pio, ASR, mask);
+        pio_writel(pio, PDR, mask);
+}
+
+static int __init pio_probe(struct platform_device *pdev)
+{
+        struct pio_device *pio = NULL;
+
+        BUG_ON(pdev->id >= MAX_NR_PIO_DEVICES);
+        pio = &pio_dev[pdev->id];
+        BUG_ON(!pio->regs);
+
+        /* TODO: Interrupts */
+
+        platform_set_drvdata(pdev, pio);
+
+        printk(KERN_INFO "%s: Atmel Port Multiplexer at 0x%p (irq %d)\n",
+               pio->name, pio->regs, platform_get_irq(pdev, 0));
+
+        return 0;
+}
+
+static struct platform_driver pio_driver = {
+        .probe          = pio_probe,
+        .driver         = {
+                .name           = "pio",
+        },
+};
+
+static int __init pio_init(void)
+{
+        return platform_driver_register(&pio_driver);
+}
+subsys_initcall(pio_init);
+
+void __init at32_init_pio(struct platform_device *pdev)
+{
+        struct resource *regs;
+        struct pio_device *pio;
+
+        if (pdev->id > MAX_NR_PIO_DEVICES) {
+                dev_err(&pdev->dev, "only %d PIO devices supported\n",
+                        MAX_NR_PIO_DEVICES);
+                return;
+        }
+
+        pio = &pio_dev[pdev->id];
+        snprintf(pio->name, sizeof(pio->name), "pio%d", pdev->id);
+
+        regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!regs) {
+                dev_err(&pdev->dev, "no mmio resource defined\n");
+                return;
+        }
+
+        pio->clk = clk_get(&pdev->dev, "mck");
+        if (IS_ERR(pio->clk))
+                /*
+                 * This is a fatal error, but if we continue we might
+                 * be so lucky that we manage to initialize the
+                 * console and display this message...
+                 */
+                dev_err(&pdev->dev, "no mck clock defined\n");
+        else
+                clk_enable(pio->clk);
+
+        pio->pdev = pdev;
+        pio->regs = ioremap(regs->start, regs->end - regs->start + 1);
+
+        pio_writel(pio, ODR, ~0UL);
+        pio_writel(pio, PER, ~0UL);
+}