nios2: Split timer code into timer.c

Move the timer code from interrupts.c into timer.c . Eliminate the
installation of timer interrupt handler, which is no longer used.

Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>

arch/nios2/cpu/Makefile

@@ -7,5 +7,5 @@
 
 extra-y	= start.o
 obj-y	= exceptions.o
-obj-y	+= cpu.o interrupts.o sysid.o traps.o
+obj-y	+= cpu.o interrupts.o sysid.o timer.o traps.o
 obj-y	+= fdt.o

arch/nios2/cpu/interrupts.c

@@ -14,36 +14,8 @@
 #include <asm/ptrace.h>
 #include <common.h>
 #include <command.h>
-#include <watchdog.h>
-#ifdef CONFIG_STATUS_LED
-#include <status_led.h>
-#endif
-
-struct nios_timer {
-	u32	status;		/* Timer status reg */
-	u32	control;	/* Timer control reg */
-	u32	periodl;	/* Timeout period low */
-	u32	periodh;	/* Timeout period high */
-	u32	snapl;		/* Snapshot low */
-	u32	snaph;		/* Snapshot high */
-};
-
-/* status register */
-#define NIOS_TIMER_TO		(1 << 0)	/* Timeout */
-#define NIOS_TIMER_RUN		(1 << 1)	/* Timer running */
-
-/* control register */
-#define NIOS_TIMER_ITO		(1 << 0)	/* Timeout int ena */
-#define NIOS_TIMER_CONT		(1 << 1)	/* Continuous mode */
-#define NIOS_TIMER_START	(1 << 2)	/* Start timer */
-#define NIOS_TIMER_STOP		(1 << 3)	/* Stop timer */
-
-#if defined(CONFIG_SYS_TIMER_BASE) && !defined(CONFIG_SYS_TIMER_IRQ)
-#error CONFIG_SYS_TIMER_IRQ not defined (see documentation)
-#endif
-
-/****************************************************************************/
 
+/*************************************************************************/
 struct	irq_action {
 	interrupt_handler_t *handler;
 	void *arg;
@@ -52,60 +24,6 @@ struct	irq_action {
 
 static struct irq_action vecs[32];
 
-/*************************************************************************/
-static volatile ulong timestamp;
-
-/*
- * The board must handle this interrupt if a timer is not
- * provided.
- */
-void tmr_isr (void *arg)
-{
-	struct nios_timer *tmr = (struct nios_timer *)arg;
-	/* Interrupt is cleared by writing anything to the
-	 * status register.
-	 */
-	writel (0, &tmr->status);
-	timestamp += CONFIG_SYS_NIOS_TMRMS;
-#ifdef CONFIG_STATUS_LED
-	status_led_tick(timestamp);
-#endif
-}
-
-unsigned long notrace timer_read_counter(void)
-{
-	struct nios_timer *tmr = (struct nios_timer *)CONFIG_SYS_TIMER_BASE;
-	u32 val;
-
-	/* Trigger update */
-	writel(0x0, &tmr->snapl);
-
-	/* Read timer value */
-	val = readl(&tmr->snapl) & 0xffff;
-	val |= (readl(&tmr->snaph) & 0xffff) << 16;
-
-	return ~val;
-}
-
-int timer_init(void)
-{
-	struct nios_timer *tmr = (struct nios_timer *)CONFIG_SYS_TIMER_BASE;
-
-	writel (0, &tmr->status);
-	writel (0, &tmr->control);
-	writel (NIOS_TIMER_STOP, &tmr->control);
-
-	writel (0xffff, &tmr->periodl);
-	writel (0xffff, &tmr->periodh);
-
-	writel (NIOS_TIMER_CONT | NIOS_TIMER_START, &tmr->control);
-	/* FIXME */
-	irq_install_handler(CONFIG_SYS_TIMER_IRQ, tmr_isr, (void *)tmr);
-
-	return 0;
-}
-
-/*************************************************************************/
 int disable_interrupts (void)
 {
 	int val = rdctl (CTL_STATUS);

arch/nios2/cpu/timer.c

@@ -0,0 +1,65 @@
+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/nios2.h>
+#include <asm/types.h>
+#include <asm/io.h>
+
+struct nios_timer {
+	u32	status;		/* Timer status reg */
+	u32	control;	/* Timer control reg */
+	u32	periodl;	/* Timeout period low */
+	u32	periodh;	/* Timeout period high */
+	u32	snapl;		/* Snapshot low */
+	u32	snaph;		/* Snapshot high */
+};
+
+/* status register */
+#define NIOS_TIMER_TO		(1 << 0)	/* Timeout */
+#define NIOS_TIMER_RUN		(1 << 1)	/* Timer running */
+
+/* control register */
+#define NIOS_TIMER_ITO		(1 << 0)	/* Timeout interrupt enable */
+#define NIOS_TIMER_CONT		(1 << 1)	/* Continuous mode */
+#define NIOS_TIMER_START	(1 << 2)	/* Start timer */
+#define NIOS_TIMER_STOP		(1 << 3)	/* Stop timer */
+
+/*************************************************************************/
+unsigned long notrace timer_read_counter(void)
+{
+	struct nios_timer *tmr = (struct nios_timer *)CONFIG_SYS_TIMER_BASE;
+	u32 val;
+
+	/* Trigger update */
+	writel(0x0, &tmr->snapl);
+
+	/* Read timer value */
+	val = readl(&tmr->snapl) & 0xffff;
+	val |= (readl(&tmr->snaph) & 0xffff) << 16;
+
+	return ~val;
+}
+
+int timer_init(void)
+{
+	struct nios_timer *tmr = (struct nios_timer *)CONFIG_SYS_TIMER_BASE;
+
+	writel(0, &tmr->status);
+	writel(0, &tmr->control);
+	writel(NIOS_TIMER_STOP, &tmr->control);
+
+	writel(0xffff, &tmr->periodl);
+	writel(0xffff, &tmr->periodh);
+
+	writel(NIOS_TIMER_CONT | NIOS_TIMER_START, &tmr->control);
+
+	return 0;
+}

include/configs/nios2-generic.h

@@ -40,7 +40,6 @@
  * TIMER
  */
 #define CONFIG_SYS_TIMER_RATE		CONFIG_SYS_TIMER_FREQ
-#define CONFIG_SYS_NIOS_TMRMS		10	/* FIXME: Desired period (msec)*/
 
 /*
  * STATUS LED
@@ -59,7 +58,7 @@
 
 #define STATUS_LED_BIT			0	/* Bit-0 on GPIO */
 #define STATUS_LED_STATE		1	/* Blinking */
-#define STATUS_LED_PERIOD	(500 / CONFIG_SYS_NIOS_TMRMS) /* 500 msec */
+#define STATUS_LED_PERIOD	(CONFIG_SYS_HZ / 2)	/* 500 msec */
 
 /*
  * BOOTP options