[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, 327 insertions, 0 deletions

diff --git a/arch/avr32/kernel/cpu.c b/arch/avr32/kernel/cpu.c
new file mode 100644
index 000000000000..342452ba2049
--- /dev/null
+++ b/arch/avr32/kernel/cpu.c
@@ -0,0 +1,327 @@
+/*
+ * Copyright (C) 2005-2006 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/init.h>
+#include <linux/sysdev.h>
+#include <linux/seq_file.h>
+#include <linux/cpu.h>
+#include <linux/percpu.h>
+#include <linux/param.h>
+#include <linux/errno.h>
+
+#include <asm/setup.h>
+#include <asm/sysreg.h>
+
+static DEFINE_PER_CPU(struct cpu, cpu_devices);
+
+#ifdef CONFIG_PERFORMANCE_COUNTERS
+
+/*
+ * XXX: If/when a SMP-capable implementation of AVR32 will ever be
+ * made, we must make sure that the code executes on the correct CPU.
+ */
+static ssize_t show_pc0event(struct sys_device *dev, char *buf)
+{
+        unsigned long pccr;
+
+        pccr = sysreg_read(PCCR);
+        return sprintf(buf, "0x%lx\n", (pccr >> 12) & 0x3f);
+}
+static ssize_t store_pc0event(struct sys_device *dev, const char *buf,
+                              size_t count)
+{
+        unsigned long val;
+        char *endp;
+
+        val = simple_strtoul(buf, &endp, 0);
+        if (endp == buf || val > 0x3f)
+                return -EINVAL;
+        val = (val << 12) | (sysreg_read(PCCR) & 0xfffc0fff);
+        sysreg_write(PCCR, val);
+        return count;
+}
+static ssize_t show_pc0count(struct sys_device *dev, char *buf)
+{
+        unsigned long pcnt0;
+
+        pcnt0 = sysreg_read(PCNT0);
+        return sprintf(buf, "%lu\n", pcnt0);
+}
+static ssize_t store_pc0count(struct sys_device *dev, const char *buf,
+                              size_t count)
+{
+        unsigned long val;
+        char *endp;
+
+        val = simple_strtoul(buf, &endp, 0);
+        if (endp == buf)
+                return -EINVAL;
+        sysreg_write(PCNT0, val);
+
+        return count;
+}
+
+static ssize_t show_pc1event(struct sys_device *dev, char *buf)
+{
+        unsigned long pccr;
+
+        pccr = sysreg_read(PCCR);
+        return sprintf(buf, "0x%lx\n", (pccr >> 18) & 0x3f);
+}
+static ssize_t store_pc1event(struct sys_device *dev, const char *buf,
+                              size_t count)
+{
+        unsigned long val;
+        char *endp;
+
+        val = simple_strtoul(buf, &endp, 0);
+        if (endp == buf || val > 0x3f)
+                return -EINVAL;
+        val = (val << 18) | (sysreg_read(PCCR) & 0xff03ffff);
+        sysreg_write(PCCR, val);
+        return count;
+}
+static ssize_t show_pc1count(struct sys_device *dev, char *buf)
+{
+        unsigned long pcnt1;
+
+        pcnt1 = sysreg_read(PCNT1);
+        return sprintf(buf, "%lu\n", pcnt1);
+}
+static ssize_t store_pc1count(struct sys_device *dev, const char *buf,
+                              size_t count)
+{
+        unsigned long val;
+        char *endp;
+
+        val = simple_strtoul(buf, &endp, 0);
+        if (endp == buf)
+                return -EINVAL;
+        sysreg_write(PCNT1, val);
+
+        return count;
+}
+
+static ssize_t show_pccycles(struct sys_device *dev, char *buf)
+{
+        unsigned long pccnt;
+
+        pccnt = sysreg_read(PCCNT);
+        return sprintf(buf, "%lu\n", pccnt);
+}
+static ssize_t store_pccycles(struct sys_device *dev, const char *buf,
+                              size_t count)
+{
+        unsigned long val;
+        char *endp;
+
+        val = simple_strtoul(buf, &endp, 0);
+        if (endp == buf)
+                return -EINVAL;
+        sysreg_write(PCCNT, val);
+
+        return count;
+}
+
+static ssize_t show_pcenable(struct sys_device *dev, char *buf)
+{
+        unsigned long pccr;
+
+        pccr = sysreg_read(PCCR);
+        return sprintf(buf, "%c\n", (pccr & 1)?'1':'0');
+}
+static ssize_t store_pcenable(struct sys_device *dev, const char *buf,
+                              size_t count)
+{
+        unsigned long pccr, val;
+        char *endp;
+
+        val = simple_strtoul(buf, &endp, 0);
+        if (endp == buf)
+                return -EINVAL;
+        if (val)
+                val = 1;
+
+        pccr = sysreg_read(PCCR);
+        pccr = (pccr & ~1UL) | val;
+        sysreg_write(PCCR, pccr);
+
+        return count;
+}
+
+static SYSDEV_ATTR(pc0event, 0600, show_pc0event, store_pc0event);
+static SYSDEV_ATTR(pc0count, 0600, show_pc0count, store_pc0count);
+static SYSDEV_ATTR(pc1event, 0600, show_pc1event, store_pc1event);
+static SYSDEV_ATTR(pc1count, 0600, show_pc1count, store_pc1count);
+static SYSDEV_ATTR(pccycles, 0600, show_pccycles, store_pccycles);
+static SYSDEV_ATTR(pcenable, 0600, show_pcenable, store_pcenable);
+
+#endif /* CONFIG_PERFORMANCE_COUNTERS */
+
+static int __init topology_init(void)
+{
+        int cpu;
+
+        for_each_possible_cpu(cpu) {
+                struct cpu *c = &per_cpu(cpu_devices, cpu);
+
+                register_cpu(c, cpu);
+
+#ifdef CONFIG_PERFORMANCE_COUNTERS
+                sysdev_create_file(&c->sysdev, &attr_pc0event);
+                sysdev_create_file(&c->sysdev, &attr_pc0count);
+                sysdev_create_file(&c->sysdev, &attr_pc1event);
+                sysdev_create_file(&c->sysdev, &attr_pc1count);
+                sysdev_create_file(&c->sysdev, &attr_pccycles);
+                sysdev_create_file(&c->sysdev, &attr_pcenable);
+#endif
+        }
+
+        return 0;
+}
+
+subsys_initcall(topology_init);
+
+static const char *cpu_names[] = {
+        "Morgan",
+        "AP7000",
+};
+#define NR_CPU_NAMES ARRAY_SIZE(cpu_names)
+
+static const char *arch_names[] = {
+        "AVR32A",
+        "AVR32B",
+};
+#define NR_ARCH_NAMES ARRAY_SIZE(arch_names)
+
+static const char *mmu_types[] = {
+        "No MMU",
+        "ITLB and DTLB",
+        "Shared TLB",
+        "MPU"
+};
+
+void __init setup_processor(void)
+{
+        unsigned long config0, config1;
+        unsigned cpu_id, cpu_rev, arch_id, arch_rev, mmu_type;
+        unsigned tmp;
+
+        config0 = sysreg_read(CONFIG0); /* 0x0000013e; */
+        config1 = sysreg_read(CONFIG1); /* 0x01f689a2; */
+        cpu_id = config0 >> 24;
+        cpu_rev = (config0 >> 16) & 0xff;
+        arch_id = (config0 >> 13) & 0x07;
+        arch_rev = (config0 >> 10) & 0x07;
+        mmu_type = (config0 >> 7) & 0x03;
+
+        boot_cpu_data.arch_type = arch_id;
+        boot_cpu_data.cpu_type = cpu_id;
+        boot_cpu_data.arch_revision = arch_rev;
+        boot_cpu_data.cpu_revision = cpu_rev;
+        boot_cpu_data.tlb_config = mmu_type;
+
+        tmp = (config1 >> 13) & 0x07;
+        if (tmp) {
+                boot_cpu_data.icache.ways = 1 << ((config1 >> 10) & 0x07);
+                boot_cpu_data.icache.sets = 1 << ((config1 >> 16) & 0x0f);
+                boot_cpu_data.icache.linesz = 1 << (tmp + 1);
+        }
+        tmp = (config1 >> 3) & 0x07;
+        if (tmp) {
+                boot_cpu_data.dcache.ways = 1 << (config1 & 0x07);
+                boot_cpu_data.dcache.sets = 1 << ((config1 >> 6) & 0x0f);
+                boot_cpu_data.dcache.linesz = 1 << (tmp + 1);
+        }
+
+        if ((cpu_id >= NR_CPU_NAMES) || (arch_id >= NR_ARCH_NAMES)) {
+                printk ("Unknown CPU configuration (ID %02x, arch %02x), "
+                        "continuing anyway...\n",
+                        cpu_id, arch_id);
+                return;
+        }
+
+        printk ("CPU: %s [%02x] revision %d (%s revision %d)\n",
+                cpu_names[cpu_id], cpu_id, cpu_rev,
+                arch_names[arch_id], arch_rev);
+        printk ("CPU: MMU configuration: %s\n", mmu_types[mmu_type]);
+        printk ("CPU: features:");
+        if (config0 & (1 << 6))
+                printk(" fpu");
+        if (config0 & (1 << 5))
+                printk(" java");
+        if (config0 & (1 << 4))
+                printk(" perfctr");
+        if (config0 & (1 << 3))
+                printk(" ocd");
+        printk("\n");
+}
+
+#ifdef CONFIG_PROC_FS
+static int c_show(struct seq_file *m, void *v)
+{
+        unsigned int icache_size, dcache_size;
+        unsigned int cpu = smp_processor_id();
+
+        icache_size = boot_cpu_data.icache.ways *
+                boot_cpu_data.icache.sets *
+                boot_cpu_data.icache.linesz;
+        dcache_size = boot_cpu_data.dcache.ways *
+                boot_cpu_data.dcache.sets *
+                boot_cpu_data.dcache.linesz;
+
+        seq_printf(m, "processor\t: %d\n", cpu);
+
+        if (boot_cpu_data.arch_type < NR_ARCH_NAMES)
+                seq_printf(m, "cpu family\t: %s revision %d\n",
+                           arch_names[boot_cpu_data.arch_type],
+                           boot_cpu_data.arch_revision);
+        if (boot_cpu_data.cpu_type < NR_CPU_NAMES)
+                seq_printf(m, "cpu type\t: %s revision %d\n",
+                           cpu_names[boot_cpu_data.cpu_type],
+                           boot_cpu_data.cpu_revision);
+
+        seq_printf(m, "i-cache\t\t: %dK (%u ways x %u sets x %u)\n",
+                   icache_size >> 10,
+                   boot_cpu_data.icache.ways,
+                   boot_cpu_data.icache.sets,
+                   boot_cpu_data.icache.linesz);
+        seq_printf(m, "d-cache\t\t: %dK (%u ways x %u sets x %u)\n",
+                   dcache_size >> 10,
+                   boot_cpu_data.dcache.ways,
+                   boot_cpu_data.dcache.sets,
+                   boot_cpu_data.dcache.linesz);
+        seq_printf(m, "bogomips\t: %lu.%02lu\n",
+                   boot_cpu_data.loops_per_jiffy / (500000/HZ),
+                   (boot_cpu_data.loops_per_jiffy / (5000/HZ)) % 100);
+
+        return 0;
+}
+
+static void *c_start(struct seq_file *m, loff_t *pos)
+{
+        return *pos < 1 ? (void *)1 : NULL;
+}
+
+static void *c_next(struct seq_file *m, void *v, loff_t *pos)
+{
+        ++*pos;
+        return NULL;
+}
+
+static void c_stop(struct seq_file *m, void *v)
+{
+
+}
+
+struct seq_operations cpuinfo_op = {
+        .start  = c_start,
+        .next   = c_next,
+        .stop   = c_stop,
+        .show   = c_show
+};
+#endif /* CONFIG_PROC_FS */