[PATCH] m68knommu: create common timer code for 68x328 processor varients

Create common timer code for all 68x328 processor varients.

Signed-off-by: Greg Ungerer <gerg@uclinux.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 106 insertions, 0 deletions

diff --git a/arch/m68knommu/platform/68328/timers.c b/arch/m68knommu/platform/68328/timers.c
new file mode 100644
index 000000000000..68c2cd6b0030
--- /dev/null
+++ b/arch/m68knommu/platform/68328/timers.c
@@ -0,0 +1,106 @@
+/***************************************************************************/
+
+/*
+ *  linux/arch/m68knommu/platform/68328/timers.c
+ *
+ *  Copyright (C) 1993 Hamish Macdonald
+ *  Copyright (C) 1999 D. Jeff Dionne
+ *  Copyright (C) 2001 Georges Menie, Ken Desmet
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+/***************************************************************************/
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <asm/setup.h>
+#include <asm/system.h>
+#include <asm/pgtable.h>
+#include <asm/irq.h>
+#include <asm/machdep.h>
+#include <asm/MC68VZ328.h>
+
+/***************************************************************************/
+
+#if defined(CONFIG_DRAGEN2)
+/* with a 33.16 MHz clock, this will give usec resolution to the time functions */
+#define CLOCK_SOURCE    TCTL_CLKSOURCE_SYSCLK
+#define CLOCK_PRE       7
+#define TICKS_PER_JIFFY 41450
+
+#elif defined(CONFIG_XCOPILOT_BUGS)
+/*
+ * The only thing I know is that CLK32 is not available on Xcopilot
+ * I have little idea about what frequency SYSCLK has on Xcopilot.
+ * The values for prescaler and compare registers were simply
+ * taken from the original source
+ */
+#define CLOCK_SOURCE    TCTL_CLKSOURCE_SYSCLK
+#define CLOCK_PRE       2
+#define TICKS_PER_JIFFY 0xd7e4
+
+#else
+/* default to using the 32Khz clock */
+#define CLOCK_SOURCE    TCTL_CLKSOURCE_32KHZ
+#define CLOCK_PRE       31
+#define TICKS_PER_JIFFY 10
+#endif
+
+/***************************************************************************/
+
+void m68328_timer_init(irqreturn_t (*timer_routine) (int, void *, struct pt_regs *))
+{
+        /* disable timer 1 */
+        TCTL = 0;
+
+        /* set ISR */
+        if (request_irq(TMR_IRQ_NUM, timer_routine, IRQ_FLG_LOCK, "timer", NULL)) 
+                panic("Unable to attach timer interrupt\n");
+
+        /* Restart mode, Enable int, Set clock source */
+        TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE;
+        TPRER = CLOCK_PRE;
+        TCMP = TICKS_PER_JIFFY;
+
+        /* Enable timer 1 */
+        TCTL |= TCTL_TEN;
+}
+
+/***************************************************************************/
+
+void m68328_timer_tick(void)
+{
+        /* Reset Timer1 */
+        TSTAT &= 0;
+}
+/***************************************************************************/
+
+unsigned long m68328_timer_gettimeoffset(void)
+{
+        unsigned long ticks = TCN, offset = 0;
+
+        /* check for pending interrupt */
+        if (ticks < (TICKS_PER_JIFFY >> 1) && (ISR & (1 << TMR_IRQ_NUM)))
+                offset = 1000000 / HZ;
+        ticks = (ticks * 1000000 / HZ) / TICKS_PER_JIFFY;
+        return ticks + offset;
+}
+
+/***************************************************************************/
+
+void m68328_timer_gettod(int *year, int *mon, int *day, int *hour, int *min, int *sec)
+{
+        long now = RTCTIME;
+
+        *year = *mon = *day = 1;
+        *hour = (now >> 24) % 24;
+        *min = (now >> 16) % 60;
+        *sec = now % 60;
+}
+
+/***************************************************************************/