linux 2.6.16.38 w/ vs2.0.3-rc1

[linux-2.6.git] / arch / arm / mach-omap2 / timer-gp.c

diff --git a/arch/arm/mach-omap2/timer-gp.c b/arch/arm/mach-omap2/timer-gp.c
index fe5fd6d..1d2f5ac 100644 (file)
--- a/arch/arm/mach-omap2/timer-gp.c
+++ b/arch/arm/mach-omap2/timer-gp.c
@@ -6,7 +6,6 @@
  * Copyright (C) 2005 Nokia Corporation
  * Author: Paul Mundt <paul.mundt@nokia.com>
  *         Juha Yrjölä <juha.yrjola@nokia.com>
- * OMAP Dual-mode timer framework support by Timo Teras
  *
  * Some parts based off of TI's 24xx code:
  *
@@ -23,18 +22,54 @@
 #include <linux/interrupt.h>
 #include <linux/err.h>
 #include <linux/clk.h>
-#include <linux/delay.h>
 
 #include <asm/mach/time.h>
-#include <asm/arch/dmtimer.h>
+#include <asm/delay.h>
+#include <asm/io.h>
 
-static struct omap_dm_timer *gptimer;
+#define OMAP2_GP_TIMER1_BASE   0x48028000
+#define OMAP2_GP_TIMER2_BASE   0x4802a000
+#define OMAP2_GP_TIMER3_BASE   0x48078000
+#define OMAP2_GP_TIMER4_BASE   0x4807a000
 
-static inline void omap2_gp_timer_start(unsigned long load_val)
+#define GP_TIMER_TIDR          0x00
+#define GP_TIMER_TISR          0x18
+#define GP_TIMER_TIER          0x1c
+#define GP_TIMER_TCLR          0x24
+#define GP_TIMER_TCRR          0x28
+#define GP_TIMER_TLDR          0x2c
+#define GP_TIMER_TSICR         0x40
+
+#define OS_TIMER_NR            1  /* GP timer 2 */
+
+static unsigned long timer_base[] = {
+       IO_ADDRESS(OMAP2_GP_TIMER1_BASE),
+       IO_ADDRESS(OMAP2_GP_TIMER2_BASE),
+       IO_ADDRESS(OMAP2_GP_TIMER3_BASE),
+       IO_ADDRESS(OMAP2_GP_TIMER4_BASE),
+};
+
+static inline unsigned int timer_read_reg(int nr, unsigned int reg)
+{
+       return __raw_readl(timer_base[nr] + reg);
+}
+
+static inline void timer_write_reg(int nr, unsigned int reg, unsigned int val)
+{
+       __raw_writel(val, timer_base[nr] + reg);
+}
+
+/* Note that we always enable the clock prescale divider bit */
+static inline void omap2_gp_timer_start(int nr, unsigned long load_val)
 {
-       omap_dm_timer_set_load(gptimer, 1, 0xffffffff - load_val);
-       omap_dm_timer_set_int_enable(gptimer, OMAP_TIMER_INT_OVERFLOW);
-       omap_dm_timer_start(gptimer);
+       unsigned int tmp;
+
+       tmp = 0xffffffff - load_val;
+
+       timer_write_reg(nr, GP_TIMER_TLDR, tmp);
+       timer_write_reg(nr, GP_TIMER_TCRR, tmp);
+       timer_write_reg(nr, GP_TIMER_TIER, 1 << 1);
+       timer_write_reg(nr, GP_TIMER_TCLR, (1 << 5) | (1 << 1) | 1);
 }
 
 static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id,
@@ -42,7 +77,7 @@ static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id,
 {
        write_seqlock(&xtime_lock);
 
-       omap_dm_timer_write_status(gptimer, OMAP_TIMER_INT_OVERFLOW);
+       timer_write_reg(OS_TIMER_NR, GP_TIMER_TISR, 1 << 1);
        timer_tick(regs);
 
        write_sequnlock(&xtime_lock);
@@ -52,26 +87,41 @@ static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id,
 
 static struct irqaction omap2_gp_timer_irq = {
        .name           = "gp timer",
-       .flags          = IRQF_DISABLED | IRQF_TIMER,
+       .flags          = SA_INTERRUPT,
        .handler        = omap2_gp_timer_interrupt,
 };
 
 static void __init omap2_gp_timer_init(void)
 {
-       u32 tick_period;
+       struct clk * sys_ck;
+       u32 tick_period = 120000;
+       u32 l;
 
-       omap_dm_timer_init();
-       gptimer = omap_dm_timer_request_specific(1);
-       BUG_ON(gptimer == NULL);
+       /* Reset clock and prescale value */
+       timer_write_reg(OS_TIMER_NR, GP_TIMER_TCLR, 0);
 
-       omap_dm_timer_set_source(gptimer, OMAP_TIMER_SRC_SYS_CLK);
-       tick_period = clk_get_rate(omap_dm_timer_get_fclk(gptimer)) / 100;
+       sys_ck = clk_get(NULL, "sys_ck");
+       if (IS_ERR(sys_ck))
+               printk(KERN_ERR "Could not get sys_ck\n");
+       else {
+               clk_enable(sys_ck);
+               tick_period = clk_get_rate(sys_ck) / 100;
+               clk_put(sys_ck);
+       }
+
+       tick_period /= 2;       /* Minimum prescale divider is 2 */
        tick_period -= 1;
 
-       setup_irq(omap_dm_timer_get_irq(gptimer), &omap2_gp_timer_irq);
-       omap2_gp_timer_start(tick_period);
+       l = timer_read_reg(OS_TIMER_NR, GP_TIMER_TIDR);
+       printk(KERN_INFO "OMAP2 GP timer (HW version %d.%d)\n",
+              (l >> 4) & 0x0f, l & 0x0f);
+
+       setup_irq(38, &omap2_gp_timer_irq);
+
+       omap2_gp_timer_start(OS_TIMER_NR, tick_period);
 }
 
 struct sys_timer omap_timer = {
        .init   = omap2_gp_timer_init,
 };
+