[arch][or1k] add or1k (OpenRISC 1000) architecture

This add support for the OpenRISC 1000 architecture, and
as the architecture specification defines an on-chip tick-timer
and interrupt controller, drivers for those are included in
this commit.
Support to utilize the MMU is implemented,
and it can be opted in and out with WITH_KERNEL_VM

dev/timer/or1k_ticktimer/include/dev/timer/or1k_ticktimer.h

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2015 Stefan Kristiansson
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#pragma once
+
+#include <sys/types.h>
+
+void or1k_ticktimer_init(uint32_t freq);

dev/timer/or1k_ticktimer/or1k_ticktimer.c

@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2015 Stefan Kristiansson
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include <trace.h>
+#include <err.h>
+#include <kernel/thread.h>
+#include <platform/timer.h>
+#include <platform/debug.h>
+#include <sys/types.h>
+#include <arch/or1k.h>
+
+#define LOCAL_TRACE 0
+
+static platform_timer_callback timer_cb;
+static void *timer_arg;
+
+static uint32_t timer_freq;
+
+static volatile uint64_t ticks = 0;
+
+status_t platform_set_periodic_timer(platform_timer_callback callback, void *arg, lk_time_t interval)
+{
+    LTRACEF("cb %p, arg %p, interval %ld\n", callback, arg, interval);
+
+    uint32_t ttmr = (uint64_t)timer_freq * interval / 1000;
+    LTRACEF("count 0x%x\n", ttmr);
+
+    timer_cb = callback;
+    timer_arg = arg;
+
+    /* disable timer before doing changes */
+    mtspr(OR1K_SPR_TICK_TTMR_ADDR, 0);
+    /* reset timer counter */
+    mtspr(OR1K_SPR_TICK_TTCR_ADDR, 0);
+    /* enable timer with given interval in 'restart' mode */
+    ttmr = OR1K_SPR_TICK_TTMR_MODE_SET(ttmr | OR1K_SPR_TICK_TTMR_IE_MASK,
+                                       OR1K_SPR_TICK_TTMR_MODE_RESTART);
+    mtspr(OR1K_SPR_TICK_TTMR_ADDR, ttmr);
+
+    return NO_ERROR;
+}
+
+lk_bigtime_t current_time_hires(void)
+{
+    return (lk_bigtime_t)ticks * 10000;
+}
+
+lk_time_t current_time(void)
+{
+    return (lk_time_t)ticks * 10;
+}
+
+enum handler_return platform_tick(void)
+{
+    ticks++;
+
+    /* clear pending interrupt flag */
+    mtspr(OR1K_SPR_TICK_TTMR_ADDR,
+          mfspr(OR1K_SPR_TICK_TTMR_ADDR) & ~(OR1K_SPR_TICK_TTMR_IP_MASK));
+
+    return timer_cb(timer_arg, ticks * 10);
+}
+
+void or1k_ticktimer_init(uint32_t freq)
+{
+    timer_freq = freq;
+    /* disable timer */
+    mtspr(OR1K_SPR_TICK_TTMR_ADDR, 0);
+    /* reset timer counter */
+    mtspr(OR1K_SPR_TICK_TTCR_ADDR, 0);
+    /* clear pending interrupt flag */
+    mtspr(OR1K_SPR_TICK_TTMR_ADDR,
+          mfspr(OR1K_SPR_TICK_TTMR_ADDR) & ~(OR1K_SPR_TICK_TTMR_IP_MASK));
+}

dev/timer/or1k_ticktimer/rules.mk

@@ -0,0 +1,14 @@
+LOCAL_DIR := $(GET_LOCAL_DIR)
+
+MODULE := $(LOCAL_DIR)
+
+GLOBAL_INCLUDES += \
+	$(LOCAL_DIR)/include
+
+#GLOBAL_DEFINES += \
+#	PLATFORM_HAS_DYNAMIC_TIMER=1
+
+MODULE_SRCS += \
+	$(LOCAL_DIR)/or1k_ticktimer.c
+
+include make/module.mk