/*
* linux/arch/arm/plat-omap/dmtimer.c
*
* OMAP Dual-Mode Timers
*
* Copyright (C) 2005 Nokia Corporation
* Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/init.h>
#include <asm/arch/hardware.h>
#include <asm/arch/dmtimer.h>
#include <asm/io.h>
#include <asm/arch/irqs.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#define OMAP_TIMER_COUNT 8
#define OMAP_TIMER_ID_REG 0x00
#define OMAP_TIMER_OCP_CFG_REG 0x10
#define OMAP_TIMER_SYS_STAT_REG 0x14
#define OMAP_TIMER_STAT_REG 0x18
#define OMAP_TIMER_INT_EN_REG 0x1c
#define OMAP_TIMER_WAKEUP_EN_REG 0x20
#define OMAP_TIMER_CTRL_REG 0x24
#define OMAP_TIMER_COUNTER_REG 0x28
#define OMAP_TIMER_LOAD_REG 0x2c
#define OMAP_TIMER_TRIGGER_REG 0x30
#define OMAP_TIMER_WRITE_PEND_REG 0x34
#define OMAP_TIMER_MATCH_REG 0x38
#define OMAP_TIMER_CAPTURE_REG 0x3c
#define OMAP_TIMER_IF_CTRL_REG 0x40
static struct dmtimer_info_struct {
struct list_head unused_timers;
struct list_head reserved_timers;
} dm_timer_info;
static struct omap_dm_timer dm_timers[] = {
{ .base=0xfffb1400, .irq=INT_1610_GPTIMER1 },
{ .base=0xfffb1c00, .irq=INT_1610_GPTIMER2 },
{ .base=0xfffb2400, .irq=INT_1610_GPTIMER3 },
{ .base=0xfffb2c00, .irq=INT_1610_GPTIMER4 },
{ .base=0xfffb3400, .irq=INT_1610_GPTIMER5 },
{ .base=0xfffb3c00, .irq=INT_1610_GPTIMER6 },
{ .base=0xfffb4400, .irq=INT_1610_GPTIMER7 },
{ .base=0xfffb4c00, .irq=INT_1610_GPTIMER8 },
{ .base=0x0 },
};
static spinlock_t dm_timer_lock;
inline void omap_dm_timer_write_reg(struct omap_dm_timer *timer, int reg, u32 value)
{
omap_writel(value, timer->base + reg);
while (omap_dm_timer_read_reg(timer, OMAP_TIMER_WRITE_PEND_REG))
;
}
u32 omap_dm_timer_read_reg(struct omap_dm_timer *timer, int reg)
{
return omap_readl(timer->base + reg);
}
int omap_dm_timers_active(void)
{
struct omap_dm_timer *timer;
for (timer = &dm_timers[0]; timer->base; ++timer)
if (omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG) &
OMAP_TIMER_CTRL_ST)
return 1;
return 0;
}
void omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
{
int n = (timer - dm_timers) << 1;
u32 l;
l = omap_readl(MOD_CONF_CTRL_1) & ~(0x03 << n);
l |= source << n;
omap_writel(l, MOD_CONF_CTRL_1);
}
static void omap_dm_timer_reset(struct omap_dm_timer *timer)
{
/* Reset and set posted mode */
omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, 0x06);
omap_dm_timer_write_reg(timer, OMAP_TIMER_OCP_CFG_REG, 0x02);
omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_ARMXOR);
}
struct omap_dm_timer * omap_dm_timer_request(void)
{
struct omap_dm_timer *timer = NULL;
unsigned long flags;
spin_lock_irqsave(&dm_timer_lock, flags);
if (!list_empty(&dm_timer_info.unused_timers)) {
timer = (struct omap_dm_timer *)
dm_timer_info.unused_timers.next;
list_move_tail((struct list_head *)timer,
&dm_timer_info.reserved_timers);
}
spin_unlock_irqrestore(&dm_timer_lock, flags);
return timer;
}
void omap_dm_timer_free(struct omap_dm_timer *timer)
{
unsigned long flags;
omap_dm_timer_reset(timer);
spin_lock_irqsave(&dm_timer_lock, flags);
list_move_tail((struct list_head *)timer, &dm_timer_info.unused_timers);
spin_unlock_irqrestore(&dm_timer_lock, flags);
}
void omap_dm_timer_set_int_enable(struct omap_dm_timer *timer,
unsigned int value)
{
omap_dm_timer_write_reg(timer, OMAP_TIMER_INT_EN_REG, value);
}
unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer)
{
return omap_dm_timer_read_reg(timer, OMAP_TIMER_STAT_REG);
}
void omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value)
{
omap_dm_timer_write_reg(timer, OMAP_TIMER_STAT_REG, value);
}
void omap_dm_timer_enable_autoreload(struct omap_dm_timer *timer)
{
u32 l;
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
l |= OMAP_TIMER_CTRL_AR;
omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
}
void omap_dm_timer_trigger(struct omap_dm_timer *timer)
{
omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 1);
}
void omap_dm_timer_set_trigger(struct omap_dm_timer *timer, unsigned int value)
{
u32 l;
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
l |= value & 0x3;
omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
}
void omap_dm_timer_start(struct omap_dm_timer *timer)
{
u32 l;
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
l |= OMAP_TIMER_CTRL_ST;
omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
}
void omap_dm_timer_stop(struct omap_dm_timer *timer)
{
u32 l;
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
l &= ~0x1;
omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
}
unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer)
{
return omap_dm_timer_read_reg(timer, OMAP_TIMER_COUNTER_REG);
}
void omap_dm_timer_reset_counter(struct omap_dm_timer *timer)
{
omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, 0);
}
void omap_dm_timer_set_load(struct omap_dm_timer *timer, unsigned int load)
{
omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
}
void omap_dm_timer_set_match(struct omap_dm_timer *timer, unsigned int match)
{
omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, match);
}
void omap_dm_timer_enable_compare(struct omap_dm_timer *timer)
{
u32 l;
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
l |= OMAP_TIMER_CTRL_CE;
omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
}
static inline void __dm_timer_init(void)
{
struct omap_dm_timer *timer;
spin_lock_init(&dm_timer_lock);
INIT_LIST_HEAD(&dm_timer_info.unused_timers);
INIT_LIST_HEAD(&dm_timer_info.reserved_timers);
timer = &dm_timers[0];
while (timer->base) {
list_add_tail((struct list_head *)timer, &dm_timer_info.unused_timers);
omap_dm_timer_reset(timer);
timer++;
}
}
static int __init omap_dm_timer_init(void)
{
if (cpu_is_omap16xx())
__dm_timer_init();
return 0;
}
arch_initcall(omap_dm_timer_init);
