2014-12-15 Stefan Wallentowitz <stefan.wallentowitz@tum.de>

        * or1k/Makefile.in: Add libor1k
        * or1k/README: New file
        * or1k/caches-asm.S: New file
        * or1k/exceptions-asm.S: New file
        * or1k/exceptions.c: New file
        * or1k/impure.c: New file
        * or1k/include/or1k-nop.h: New file
        * or1k/include/or1k-support.h: New file
        * or1k/interrupts-asm.S: New file
        * or1k/interrupts.c: New file
        * or1k/mmu-asm.S: New file
        * or1k/or1k-internals.h: New file
        * or1k/or1k_uart.c: New file
        * or1k/or1k_uart.h: New file
        * or1k/outbyte.S: New file
        * or1k/sbrk.c: New file
        * or1k/sync-asm.S: New file
        * or1k/syscalls.c: New file
        * or1k/timer.c: New file
        * or1k/util.c: New file

1 files changed, 186 insertions, 0 deletions

diff --git a/libgloss/or1k/timer.c b/libgloss/or1k/timer.c
new file mode 100644
index 000000000..27a24a1c1
--- /dev/null
+++ b/libgloss/or1k/timer.c
@@ -0,0 +1,186 @@
+/* timer.c -- tick timer functions for OpenRISC 1000.
+ *
+ * Copyright (c) 2011, 2014 Authors
+ *
+ * Contributor Julius Baxter <juliusbaxter@gmail.com>
+ * Contributor Stefan Wallentowitz <stefan.wallentowitz@tum.de>
+ *
+ * The authors hereby grant permission to use, copy, modify, distribute,
+ * and license this software and its documentation for any purpose, provided
+ * that existing copyright notices are retained in all copies and that this
+ * notice is included verbatim in any distributions. No written agreement,
+ * license, or royalty fee is required for any of the authorized uses.
+ * Modifications to this software may be copyrighted by their authors
+ * and need not follow the licensing terms described here, provided that
+ * the new terms are clearly indicated on the first page of each file where
+ * they apply.
+ */
+
+#include "include/or1k-support.h"
+#include "include/or1k-sprs.h"
+
+#include "or1k-internals.h"
+#include "board.h"
+
+/* --------------------------------------------------------------------------*/
+/*!Tick timer interrupt handler
+
+   Increment timer ticks counter, reload TTMR
+                                                                             */
+/* --------------------------------------------------------------------------*/
+void
+_or1k_timer_interrupt_handler(void)
+{
+	OR1K_REENT.or1k_timer_ticks++;
+	uint32_t ttmr = or1k_mfspr(OR1K_SPR_TICK_TTMR_ADDR);
+	ttmr = OR1K_SPR_TICK_TTMR_IE_SET(ttmr, 1);
+	ttmr = OR1K_SPR_TICK_TTMR_MODE_SET(ttmr, OR1K_SPR_TICK_TTMR_MODE_RESTART);
+	ttmr = OR1K_SPR_TICK_TTMR_IE_SET(ttmr, 1);
+	or1k_mtspr(OR1K_SPR_TICK_TTMR_ADDR, ttmr);
+}
+
+/* --------------------------------------------------------------------------*/
+/*!Enable tick timer
+
+   Install handler, calculate TTMR period, reset tick counter
+
+   @param[in] hz     Rate at which to trigger timer ticks                    */
+/* --------------------------------------------------------------------------*/
+int
+or1k_timer_init(unsigned int hz)
+{
+	uint32_t upr = or1k_mfspr(OR1K_SPR_SYS_UPR_ADDR);
+	if (OR1K_SPR_SYS_UPR_TTP_GET(upr) == 0) {
+		return -1;
+	}
+
+	/* Set this, for easy access when reloading */
+	uint32_t period = (_or1k_board_clk_freq/hz) & OR1K_SPR_TICK_TTMR_TP_MASK;
+	OR1K_REENT.or1k_timer_period = period;
+	or1k_mtspr(OR1K_SPR_TICK_TTMR_ADDR, period);
+
+	/* Reset timer tick counter */
+	OR1K_REENT.or1k_timer_ticks = 0;
+
+	/* Install handler */
+	or1k_exception_handler_add(0x5, _or1k_timer_interrupt_handler);
+	OR1K_REENT.or1k_timer_mode = OR1K_SPR_TICK_TTMR_MODE_RESTART;
+
+	/* Reset counter register */
+	or1k_mtspr(OR1K_SPR_TICK_TTCR_ADDR, 0);
+
+	return 0;
+}
+
+void
+or1k_timer_set_period(uint32_t hz)
+{
+	uint32_t period = (_or1k_board_clk_freq/hz) & OR1K_SPR_TICK_TTMR_TP_MASK;
+	uint32_t ttmr = or1k_mfspr(OR1K_SPR_TICK_TTMR_ADDR);
+	ttmr = OR1K_SPR_TICK_TTMR_TP_SET(ttmr, period);
+	or1k_mtspr(OR1K_SPR_TICK_TTMR_ADDR, ttmr);
+	OR1K_REENT.or1k_timer_period = period;
+}
+
+void
+or1k_timer_set_handler(void (*handler)(void))
+{
+	or1k_exception_handler_add(0x5, handler);
+}
+
+void
+or1k_timer_set_mode(uint32_t mode)
+{
+	// Store mode in variable
+	OR1K_REENT.or1k_timer_mode = mode;
+
+	uint32_t ttmr = or1k_mfspr(OR1K_SPR_TICK_TTMR_ADDR);
+	// If the timer is currently running, we also change the mode
+	if (OR1K_SPR_TICK_TTMR_MODE_GET(ttmr) != 0) {
+		ttmr = OR1K_SPR_TICK_TTMR_MODE_SET(ttmr, mode);
+		or1k_mtspr(OR1K_SPR_TICK_TTMR_ADDR, ttmr);
+	}
+}
+
+/* --------------------------------------------------------------------------*/
+/*!Enable tick timer
+
+   Enable timer interrupt, install handler, load TTMR
+                                                                             */
+/* --------------------------------------------------------------------------*/
+void
+or1k_timer_enable(void)
+{
+	uint32_t ttmr = or1k_mfspr(OR1K_SPR_TICK_TTMR_ADDR);
+	ttmr = OR1K_SPR_TICK_TTMR_IE_SET(ttmr, 1);
+	ttmr = OR1K_SPR_TICK_TTMR_MODE_SET(ttmr, OR1K_REENT.or1k_timer_mode);
+	or1k_mtspr(OR1K_SPR_TICK_TTMR_ADDR, ttmr);
+
+	uint32_t sr = or1k_mfspr(OR1K_SPR_SYS_SR_ADDR);
+	sr = OR1K_SPR_SYS_SR_TEE_SET(sr, 1);
+	or1k_mtspr(OR1K_SPR_SYS_SR_ADDR, sr);
+}
+
+/* --------------------------------------------------------------------------*/
+/*!Disable tick timer
+
+   Disable timer interrupt in SR
+                                                                             */
+/* --------------------------------------------------------------------------*/
+uint32_t
+or1k_timer_disable(void)
+{
+	uint32_t oldsr = or1k_mfspr(OR1K_SPR_SYS_SR_ADDR);
+	uint32_t sr = OR1K_SPR_SYS_SR_TEE_SET(oldsr, 0);
+	or1k_mtspr(OR1K_SPR_SYS_SR_ADDR, sr);
+	return OR1K_SPR_SYS_SR_TEE_GET(oldsr);
+}
+
+void
+or1k_timer_restore(uint32_t sr_tee)
+{
+	uint32_t sr = or1k_mfspr(OR1K_SPR_SYS_SR_ADDR);
+	sr = OR1K_SPR_SYS_SR_TEE_SET(sr, 1);
+	or1k_mtspr(OR1K_SPR_SYS_SR_ADDR, sr);
+}
+
+void
+or1k_timer_pause(void)
+{
+	uint32_t ttmr = or1k_mfspr(OR1K_SPR_TICK_TTMR_ADDR);
+	ttmr = OR1K_SPR_TICK_TTMR_MODE_SET(ttmr, OR1K_SPR_TICK_TTMR_MODE_DISABLE);
+	or1k_mtspr(OR1K_SPR_TICK_TTMR_ADDR, ttmr);
+}
+
+void
+or1k_timer_reset(void)
+{
+	uint32_t ttmr = or1k_mfspr(OR1K_SPR_TICK_TTMR_ADDR);
+	ttmr = OR1K_SPR_TICK_TTMR_IP_SET(ttmr, 0);
+	or1k_mtspr(OR1K_SPR_TICK_TTMR_ADDR, ttmr);
+	or1k_mtspr(OR1K_SPR_TICK_TTCR_ADDR, 0);
+}
+
+/* --------------------------------------------------------------------------*/
+/*!Get tick timer
+
+   Return value of tick timer
+                                                                             */
+/* --------------------------------------------------------------------------*/
+unsigned long
+or1k_timer_get_ticks(void)
+{
+	return OR1K_REENT.or1k_timer_ticks;
+}
+
+/* --------------------------------------------------------------------------*/
+/*!Reset tick timer
+
+   Clear value of tick timer
+                                                                             */
+/* --------------------------------------------------------------------------*/
+void
+or1k_timer_reset_ticks(void)
+{
+	OR1K_REENT.or1k_timer_ticks = 0;
+}