linux/arch/arm/plat-omap/dmtimer.c
Tero Kristo 856f191451 omap: DMTIMER: Ack pending interrupt always when stopping a timer
The kernel timer queue is being run currently from a GP timer running in a one
shot mode, which works in a way that when it expires, it will also stop.
Usually during this situation, the interrupt handler will ack the interrupt,
load a new value to the timer and start it again. During suspend, the
situation is slightly different, as we disable interrupts just before
timekeeping is suspended, which leaves a small window where the timer can
expire before it is stopped, and will leave the interrupt flag pending.
This pending interrupt will prevent ARM sleep entry, thus now we ack it always
when we are attempting to stop a timer.

Signed-off-by: Tero Kristo <tero.kristo@nokia.com>
Acked-by: Kevin Hilman <khilman@deeprootsystems.com>
[tony@atomide.com: removed the ifdef to make the patch cover omap1 also]
Signed-off-by: Tony Lindgren <tony@atomide.com>
2010-06-10 15:37:41 +03:00

794 lines
22 KiB
C

/*
* linux/arch/arm/plat-omap/dmtimer.c
*
* OMAP Dual-Mode Timers
*
* Copyright (C) 2005 Nokia Corporation
* OMAP2 support by Juha Yrjola
* API improvements and OMAP2 clock framework support by Timo Teras
*
* Copyright (C) 2009 Texas Instruments
* Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.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 <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/module.h>
#include <mach/hardware.h>
#include <plat/dmtimer.h>
#include <mach/irqs.h>
/* register offsets */
#define _OMAP_TIMER_ID_OFFSET 0x00
#define _OMAP_TIMER_OCP_CFG_OFFSET 0x10
#define _OMAP_TIMER_SYS_STAT_OFFSET 0x14
#define _OMAP_TIMER_STAT_OFFSET 0x18
#define _OMAP_TIMER_INT_EN_OFFSET 0x1c
#define _OMAP_TIMER_WAKEUP_EN_OFFSET 0x20
#define _OMAP_TIMER_CTRL_OFFSET 0x24
#define OMAP_TIMER_CTRL_GPOCFG (1 << 14)
#define OMAP_TIMER_CTRL_CAPTMODE (1 << 13)
#define OMAP_TIMER_CTRL_PT (1 << 12)
#define OMAP_TIMER_CTRL_TCM_LOWTOHIGH (0x1 << 8)
#define OMAP_TIMER_CTRL_TCM_HIGHTOLOW (0x2 << 8)
#define OMAP_TIMER_CTRL_TCM_BOTHEDGES (0x3 << 8)
#define OMAP_TIMER_CTRL_SCPWM (1 << 7)
#define OMAP_TIMER_CTRL_CE (1 << 6) /* compare enable */
#define OMAP_TIMER_CTRL_PRE (1 << 5) /* prescaler enable */
#define OMAP_TIMER_CTRL_PTV_SHIFT 2 /* prescaler value shift */
#define OMAP_TIMER_CTRL_POSTED (1 << 2)
#define OMAP_TIMER_CTRL_AR (1 << 1) /* auto-reload enable */
#define OMAP_TIMER_CTRL_ST (1 << 0) /* start timer */
#define _OMAP_TIMER_COUNTER_OFFSET 0x28
#define _OMAP_TIMER_LOAD_OFFSET 0x2c
#define _OMAP_TIMER_TRIGGER_OFFSET 0x30
#define _OMAP_TIMER_WRITE_PEND_OFFSET 0x34
#define WP_NONE 0 /* no write pending bit */
#define WP_TCLR (1 << 0)
#define WP_TCRR (1 << 1)
#define WP_TLDR (1 << 2)
#define WP_TTGR (1 << 3)
#define WP_TMAR (1 << 4)
#define WP_TPIR (1 << 5)
#define WP_TNIR (1 << 6)
#define WP_TCVR (1 << 7)
#define WP_TOCR (1 << 8)
#define WP_TOWR (1 << 9)
#define _OMAP_TIMER_MATCH_OFFSET 0x38
#define _OMAP_TIMER_CAPTURE_OFFSET 0x3c
#define _OMAP_TIMER_IF_CTRL_OFFSET 0x40
#define _OMAP_TIMER_CAPTURE2_OFFSET 0x44 /* TCAR2, 34xx only */
#define _OMAP_TIMER_TICK_POS_OFFSET 0x48 /* TPIR, 34xx only */
#define _OMAP_TIMER_TICK_NEG_OFFSET 0x4c /* TNIR, 34xx only */
#define _OMAP_TIMER_TICK_COUNT_OFFSET 0x50 /* TCVR, 34xx only */
#define _OMAP_TIMER_TICK_INT_MASK_SET_OFFSET 0x54 /* TOCR, 34xx only */
#define _OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET 0x58 /* TOWR, 34xx only */
/* register offsets with the write pending bit encoded */
#define WPSHIFT 16
#define OMAP_TIMER_ID_REG (_OMAP_TIMER_ID_OFFSET \
| (WP_NONE << WPSHIFT))
#define OMAP_TIMER_OCP_CFG_REG (_OMAP_TIMER_OCP_CFG_OFFSET \
| (WP_NONE << WPSHIFT))
#define OMAP_TIMER_SYS_STAT_REG (_OMAP_TIMER_SYS_STAT_OFFSET \
| (WP_NONE << WPSHIFT))
#define OMAP_TIMER_STAT_REG (_OMAP_TIMER_STAT_OFFSET \
| (WP_NONE << WPSHIFT))
#define OMAP_TIMER_INT_EN_REG (_OMAP_TIMER_INT_EN_OFFSET \
| (WP_NONE << WPSHIFT))
#define OMAP_TIMER_WAKEUP_EN_REG (_OMAP_TIMER_WAKEUP_EN_OFFSET \
| (WP_NONE << WPSHIFT))
#define OMAP_TIMER_CTRL_REG (_OMAP_TIMER_CTRL_OFFSET \
| (WP_TCLR << WPSHIFT))
#define OMAP_TIMER_COUNTER_REG (_OMAP_TIMER_COUNTER_OFFSET \
| (WP_TCRR << WPSHIFT))
#define OMAP_TIMER_LOAD_REG (_OMAP_TIMER_LOAD_OFFSET \
| (WP_TLDR << WPSHIFT))
#define OMAP_TIMER_TRIGGER_REG (_OMAP_TIMER_TRIGGER_OFFSET \
| (WP_TTGR << WPSHIFT))
#define OMAP_TIMER_WRITE_PEND_REG (_OMAP_TIMER_WRITE_PEND_OFFSET \
| (WP_NONE << WPSHIFT))
#define OMAP_TIMER_MATCH_REG (_OMAP_TIMER_MATCH_OFFSET \
| (WP_TMAR << WPSHIFT))
#define OMAP_TIMER_CAPTURE_REG (_OMAP_TIMER_CAPTURE_OFFSET \
| (WP_NONE << WPSHIFT))
#define OMAP_TIMER_IF_CTRL_REG (_OMAP_TIMER_IF_CTRL_OFFSET \
| (WP_NONE << WPSHIFT))
#define OMAP_TIMER_CAPTURE2_REG (_OMAP_TIMER_CAPTURE2_OFFSET \
| (WP_NONE << WPSHIFT))
#define OMAP_TIMER_TICK_POS_REG (_OMAP_TIMER_TICK_POS_OFFSET \
| (WP_TPIR << WPSHIFT))
#define OMAP_TIMER_TICK_NEG_REG (_OMAP_TIMER_TICK_NEG_OFFSET \
| (WP_TNIR << WPSHIFT))
#define OMAP_TIMER_TICK_COUNT_REG (_OMAP_TIMER_TICK_COUNT_OFFSET \
| (WP_TCVR << WPSHIFT))
#define OMAP_TIMER_TICK_INT_MASK_SET_REG \
(_OMAP_TIMER_TICK_INT_MASK_SET_OFFSET | (WP_TOCR << WPSHIFT))
#define OMAP_TIMER_TICK_INT_MASK_COUNT_REG \
(_OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET | (WP_TOWR << WPSHIFT))
struct omap_dm_timer {
unsigned long phys_base;
int irq;
#ifdef CONFIG_ARCH_OMAP2PLUS
struct clk *iclk, *fclk;
#endif
void __iomem *io_base;
unsigned reserved:1;
unsigned enabled:1;
unsigned posted:1;
};
static int dm_timer_count;
#ifdef CONFIG_ARCH_OMAP1
static struct omap_dm_timer omap1_dm_timers[] = {
{ .phys_base = 0xfffb1400, .irq = INT_1610_GPTIMER1 },
{ .phys_base = 0xfffb1c00, .irq = INT_1610_GPTIMER2 },
{ .phys_base = 0xfffb2400, .irq = INT_1610_GPTIMER3 },
{ .phys_base = 0xfffb2c00, .irq = INT_1610_GPTIMER4 },
{ .phys_base = 0xfffb3400, .irq = INT_1610_GPTIMER5 },
{ .phys_base = 0xfffb3c00, .irq = INT_1610_GPTIMER6 },
{ .phys_base = 0xfffb7400, .irq = INT_1610_GPTIMER7 },
{ .phys_base = 0xfffbd400, .irq = INT_1610_GPTIMER8 },
};
static const int omap1_dm_timer_count = ARRAY_SIZE(omap1_dm_timers);
#else
#define omap1_dm_timers NULL
#define omap1_dm_timer_count 0
#endif /* CONFIG_ARCH_OMAP1 */
#ifdef CONFIG_ARCH_OMAP2
static struct omap_dm_timer omap2_dm_timers[] = {
{ .phys_base = 0x48028000, .irq = INT_24XX_GPTIMER1 },
{ .phys_base = 0x4802a000, .irq = INT_24XX_GPTIMER2 },
{ .phys_base = 0x48078000, .irq = INT_24XX_GPTIMER3 },
{ .phys_base = 0x4807a000, .irq = INT_24XX_GPTIMER4 },
{ .phys_base = 0x4807c000, .irq = INT_24XX_GPTIMER5 },
{ .phys_base = 0x4807e000, .irq = INT_24XX_GPTIMER6 },
{ .phys_base = 0x48080000, .irq = INT_24XX_GPTIMER7 },
{ .phys_base = 0x48082000, .irq = INT_24XX_GPTIMER8 },
{ .phys_base = 0x48084000, .irq = INT_24XX_GPTIMER9 },
{ .phys_base = 0x48086000, .irq = INT_24XX_GPTIMER10 },
{ .phys_base = 0x48088000, .irq = INT_24XX_GPTIMER11 },
{ .phys_base = 0x4808a000, .irq = INT_24XX_GPTIMER12 },
};
static const char *omap2_dm_source_names[] __initdata = {
"sys_ck",
"func_32k_ck",
"alt_ck",
NULL
};
static struct clk *omap2_dm_source_clocks[3];
static const int omap2_dm_timer_count = ARRAY_SIZE(omap2_dm_timers);
#else
#define omap2_dm_timers NULL
#define omap2_dm_timer_count 0
#define omap2_dm_source_names NULL
#define omap2_dm_source_clocks NULL
#endif /* CONFIG_ARCH_OMAP2 */
#ifdef CONFIG_ARCH_OMAP3
static struct omap_dm_timer omap3_dm_timers[] = {
{ .phys_base = 0x48318000, .irq = INT_24XX_GPTIMER1 },
{ .phys_base = 0x49032000, .irq = INT_24XX_GPTIMER2 },
{ .phys_base = 0x49034000, .irq = INT_24XX_GPTIMER3 },
{ .phys_base = 0x49036000, .irq = INT_24XX_GPTIMER4 },
{ .phys_base = 0x49038000, .irq = INT_24XX_GPTIMER5 },
{ .phys_base = 0x4903A000, .irq = INT_24XX_GPTIMER6 },
{ .phys_base = 0x4903C000, .irq = INT_24XX_GPTIMER7 },
{ .phys_base = 0x4903E000, .irq = INT_24XX_GPTIMER8 },
{ .phys_base = 0x49040000, .irq = INT_24XX_GPTIMER9 },
{ .phys_base = 0x48086000, .irq = INT_24XX_GPTIMER10 },
{ .phys_base = 0x48088000, .irq = INT_24XX_GPTIMER11 },
{ .phys_base = 0x48304000, .irq = INT_34XX_GPT12_IRQ },
};
static const char *omap3_dm_source_names[] __initdata = {
"sys_ck",
"omap_32k_fck",
NULL
};
static struct clk *omap3_dm_source_clocks[2];
static const int omap3_dm_timer_count = ARRAY_SIZE(omap3_dm_timers);
#else
#define omap3_dm_timers NULL
#define omap3_dm_timer_count 0
#define omap3_dm_source_names NULL
#define omap3_dm_source_clocks NULL
#endif /* CONFIG_ARCH_OMAP3 */
#ifdef CONFIG_ARCH_OMAP4
static struct omap_dm_timer omap4_dm_timers[] = {
{ .phys_base = 0x4a318000, .irq = OMAP44XX_IRQ_GPT1 },
{ .phys_base = 0x48032000, .irq = OMAP44XX_IRQ_GPT2 },
{ .phys_base = 0x48034000, .irq = OMAP44XX_IRQ_GPT3 },
{ .phys_base = 0x48036000, .irq = OMAP44XX_IRQ_GPT4 },
{ .phys_base = 0x40138000, .irq = OMAP44XX_IRQ_GPT5 },
{ .phys_base = 0x4013a000, .irq = OMAP44XX_IRQ_GPT6 },
{ .phys_base = 0x4013a000, .irq = OMAP44XX_IRQ_GPT7 },
{ .phys_base = 0x4013e000, .irq = OMAP44XX_IRQ_GPT8 },
{ .phys_base = 0x4803e000, .irq = OMAP44XX_IRQ_GPT9 },
{ .phys_base = 0x48086000, .irq = OMAP44XX_IRQ_GPT10 },
{ .phys_base = 0x48088000, .irq = OMAP44XX_IRQ_GPT11 },
{ .phys_base = 0x4a320000, .irq = OMAP44XX_IRQ_GPT12 },
};
static const char *omap4_dm_source_names[] __initdata = {
"sys_clkin_ck",
"sys_32k_ck",
NULL
};
static struct clk *omap4_dm_source_clocks[2];
static const int omap4_dm_timer_count = ARRAY_SIZE(omap4_dm_timers);
#else
#define omap4_dm_timers NULL
#define omap4_dm_timer_count 0
#define omap4_dm_source_names NULL
#define omap4_dm_source_clocks NULL
#endif /* CONFIG_ARCH_OMAP4 */
static struct omap_dm_timer *dm_timers;
static const char **dm_source_names;
static struct clk **dm_source_clocks;
static spinlock_t dm_timer_lock;
/*
* Reads timer registers in posted and non-posted mode. The posted mode bit
* is encoded in reg. Note that in posted mode write pending bit must be
* checked. Otherwise a read of a non completed write will produce an error.
*/
static inline u32 omap_dm_timer_read_reg(struct omap_dm_timer *timer, u32 reg)
{
if (timer->posted)
while (readl(timer->io_base + (OMAP_TIMER_WRITE_PEND_REG & 0xff))
& (reg >> WPSHIFT))
cpu_relax();
return readl(timer->io_base + (reg & 0xff));
}
/*
* Writes timer registers in posted and non-posted mode. The posted mode bit
* is encoded in reg. Note that in posted mode the write pending bit must be
* checked. Otherwise a write on a register which has a pending write will be
* lost.
*/
static void omap_dm_timer_write_reg(struct omap_dm_timer *timer, u32 reg,
u32 value)
{
if (timer->posted)
while (readl(timer->io_base + (OMAP_TIMER_WRITE_PEND_REG & 0xff))
& (reg >> WPSHIFT))
cpu_relax();
writel(value, timer->io_base + (reg & 0xff));
}
static void omap_dm_timer_wait_for_reset(struct omap_dm_timer *timer)
{
int c;
c = 0;
while (!(omap_dm_timer_read_reg(timer, OMAP_TIMER_SYS_STAT_REG) & 1)) {
c++;
if (c > 100000) {
printk(KERN_ERR "Timer failed to reset\n");
return;
}
}
}
static void omap_dm_timer_reset(struct omap_dm_timer *timer)
{
u32 l;
if (!cpu_class_is_omap2() || timer != &dm_timers[0]) {
omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, 0x06);
omap_dm_timer_wait_for_reset(timer);
}
omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_32_KHZ);
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_OCP_CFG_REG);
l |= 0x02 << 3; /* Set to smart-idle mode */
l |= 0x2 << 8; /* Set clock activity to perserve f-clock on idle */
/*
* Enable wake-up on OMAP2 CPUs.
*/
if (cpu_class_is_omap2())
l |= 1 << 2;
omap_dm_timer_write_reg(timer, OMAP_TIMER_OCP_CFG_REG, l);
/* Match hardware reset default of posted mode */
omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG,
OMAP_TIMER_CTRL_POSTED);
timer->posted = 1;
}
static void omap_dm_timer_prepare(struct omap_dm_timer *timer)
{
omap_dm_timer_enable(timer);
omap_dm_timer_reset(timer);
}
struct omap_dm_timer *omap_dm_timer_request(void)
{
struct omap_dm_timer *timer = NULL;
unsigned long flags;
int i;
spin_lock_irqsave(&dm_timer_lock, flags);
for (i = 0; i < dm_timer_count; i++) {
if (dm_timers[i].reserved)
continue;
timer = &dm_timers[i];
timer->reserved = 1;
break;
}
spin_unlock_irqrestore(&dm_timer_lock, flags);
if (timer != NULL)
omap_dm_timer_prepare(timer);
return timer;
}
EXPORT_SYMBOL_GPL(omap_dm_timer_request);
struct omap_dm_timer *omap_dm_timer_request_specific(int id)
{
struct omap_dm_timer *timer;
unsigned long flags;
spin_lock_irqsave(&dm_timer_lock, flags);
if (id <= 0 || id > dm_timer_count || dm_timers[id-1].reserved) {
spin_unlock_irqrestore(&dm_timer_lock, flags);
printk("BUG: warning at %s:%d/%s(): unable to get timer %d\n",
__FILE__, __LINE__, __func__, id);
dump_stack();
return NULL;
}
timer = &dm_timers[id-1];
timer->reserved = 1;
spin_unlock_irqrestore(&dm_timer_lock, flags);
omap_dm_timer_prepare(timer);
return timer;
}
EXPORT_SYMBOL_GPL(omap_dm_timer_request_specific);
void omap_dm_timer_free(struct omap_dm_timer *timer)
{
omap_dm_timer_enable(timer);
omap_dm_timer_reset(timer);
omap_dm_timer_disable(timer);
WARN_ON(!timer->reserved);
timer->reserved = 0;
}
EXPORT_SYMBOL_GPL(omap_dm_timer_free);
void omap_dm_timer_enable(struct omap_dm_timer *timer)
{
if (timer->enabled)
return;
#ifdef CONFIG_ARCH_OMAP2PLUS
if (cpu_class_is_omap2()) {
clk_enable(timer->fclk);
clk_enable(timer->iclk);
}
#endif
timer->enabled = 1;
}
EXPORT_SYMBOL_GPL(omap_dm_timer_enable);
void omap_dm_timer_disable(struct omap_dm_timer *timer)
{
if (!timer->enabled)
return;
#ifdef CONFIG_ARCH_OMAP2PLUS
if (cpu_class_is_omap2()) {
clk_disable(timer->iclk);
clk_disable(timer->fclk);
}
#endif
timer->enabled = 0;
}
EXPORT_SYMBOL_GPL(omap_dm_timer_disable);
int omap_dm_timer_get_irq(struct omap_dm_timer *timer)
{
return timer->irq;
}
EXPORT_SYMBOL_GPL(omap_dm_timer_get_irq);
#if defined(CONFIG_ARCH_OMAP1)
/**
* omap_dm_timer_modify_idlect_mask - Check if any running timers use ARMXOR
* @inputmask: current value of idlect mask
*/
__u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
{
int i;
/* If ARMXOR cannot be idled this function call is unnecessary */
if (!(inputmask & (1 << 1)))
return inputmask;
/* If any active timer is using ARMXOR return modified mask */
for (i = 0; i < dm_timer_count; i++) {
u32 l;
l = omap_dm_timer_read_reg(&dm_timers[i], OMAP_TIMER_CTRL_REG);
if (l & OMAP_TIMER_CTRL_ST) {
if (((omap_readl(MOD_CONF_CTRL_1) >> (i * 2)) & 0x03) == 0)
inputmask &= ~(1 << 1);
else
inputmask &= ~(1 << 2);
}
}
return inputmask;
}
EXPORT_SYMBOL_GPL(omap_dm_timer_modify_idlect_mask);
#else
struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer)
{
return timer->fclk;
}
EXPORT_SYMBOL_GPL(omap_dm_timer_get_fclk);
__u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
{
BUG();
return 0;
}
EXPORT_SYMBOL_GPL(omap_dm_timer_modify_idlect_mask);
#endif
void omap_dm_timer_trigger(struct omap_dm_timer *timer)
{
omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
}
EXPORT_SYMBOL_GPL(omap_dm_timer_trigger);
void omap_dm_timer_start(struct omap_dm_timer *timer)
{
u32 l;
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
if (!(l & OMAP_TIMER_CTRL_ST)) {
l |= OMAP_TIMER_CTRL_ST;
omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
}
}
EXPORT_SYMBOL_GPL(omap_dm_timer_start);
void omap_dm_timer_stop(struct omap_dm_timer *timer)
{
u32 l;
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
if (l & OMAP_TIMER_CTRL_ST) {
l &= ~0x1;
omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
#ifdef CONFIG_ARCH_OMAP2PLUS
/* Readback to make sure write has completed */
omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
/*
* Wait for functional clock period x 3.5 to make sure that
* timer is stopped
*/
udelay(3500000 / clk_get_rate(timer->fclk) + 1);
#endif
}
/* Ack possibly pending interrupt */
omap_dm_timer_write_reg(timer, OMAP_TIMER_STAT_REG,
OMAP_TIMER_INT_OVERFLOW);
}
EXPORT_SYMBOL_GPL(omap_dm_timer_stop);
#ifdef CONFIG_ARCH_OMAP1
int 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);
return 0;
}
EXPORT_SYMBOL_GPL(omap_dm_timer_set_source);
#else
int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
{
int ret = -EINVAL;
if (source < 0 || source >= 3)
return -EINVAL;
clk_disable(timer->fclk);
ret = clk_set_parent(timer->fclk, dm_source_clocks[source]);
clk_enable(timer->fclk);
/*
* When the functional clock disappears, too quick writes seem
* to cause an abort. XXX Is this still necessary?
*/
__delay(150000);
return ret;
}
EXPORT_SYMBOL_GPL(omap_dm_timer_set_source);
#endif
void omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload,
unsigned int load)
{
u32 l;
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
if (autoreload)
l |= OMAP_TIMER_CTRL_AR;
else
l &= ~OMAP_TIMER_CTRL_AR;
omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
}
EXPORT_SYMBOL_GPL(omap_dm_timer_set_load);
/* Optimized set_load which removes costly spin wait in timer_start */
void omap_dm_timer_set_load_start(struct omap_dm_timer *timer, int autoreload,
unsigned int load)
{
u32 l;
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
if (autoreload) {
l |= OMAP_TIMER_CTRL_AR;
omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
} else {
l &= ~OMAP_TIMER_CTRL_AR;
}
l |= OMAP_TIMER_CTRL_ST;
omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, load);
omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
}
EXPORT_SYMBOL_GPL(omap_dm_timer_set_load_start);
void omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable,
unsigned int match)
{
u32 l;
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
if (enable)
l |= OMAP_TIMER_CTRL_CE;
else
l &= ~OMAP_TIMER_CTRL_CE;
omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, match);
}
EXPORT_SYMBOL_GPL(omap_dm_timer_set_match);
void omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on,
int toggle, int trigger)
{
u32 l;
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
l &= ~(OMAP_TIMER_CTRL_GPOCFG | OMAP_TIMER_CTRL_SCPWM |
OMAP_TIMER_CTRL_PT | (0x03 << 10));
if (def_on)
l |= OMAP_TIMER_CTRL_SCPWM;
if (toggle)
l |= OMAP_TIMER_CTRL_PT;
l |= trigger << 10;
omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
}
EXPORT_SYMBOL_GPL(omap_dm_timer_set_pwm);
void omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler)
{
u32 l;
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
l &= ~(OMAP_TIMER_CTRL_PRE | (0x07 << 2));
if (prescaler >= 0x00 && prescaler <= 0x07) {
l |= OMAP_TIMER_CTRL_PRE;
l |= prescaler << 2;
}
omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
}
EXPORT_SYMBOL_GPL(omap_dm_timer_set_prescaler);
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);
omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG, value);
}
EXPORT_SYMBOL_GPL(omap_dm_timer_set_int_enable);
unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer)
{
unsigned int l;
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_STAT_REG);
return l;
}
EXPORT_SYMBOL_GPL(omap_dm_timer_read_status);
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);
}
EXPORT_SYMBOL_GPL(omap_dm_timer_write_status);
unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer)
{
unsigned int l;
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_COUNTER_REG);
return l;
}
EXPORT_SYMBOL_GPL(omap_dm_timer_read_counter);
void omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value)
{
omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, value);
}
EXPORT_SYMBOL_GPL(omap_dm_timer_write_counter);
int omap_dm_timers_active(void)
{
int i;
for (i = 0; i < dm_timer_count; i++) {
struct omap_dm_timer *timer;
timer = &dm_timers[i];
if (!timer->enabled)
continue;
if (omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG) &
OMAP_TIMER_CTRL_ST) {
return 1;
}
}
return 0;
}
EXPORT_SYMBOL_GPL(omap_dm_timers_active);
int __init omap_dm_timer_init(void)
{
struct omap_dm_timer *timer;
int i, map_size = SZ_8K; /* Module 4KB + L4 4KB except on omap1 */
if (!(cpu_is_omap16xx() || cpu_class_is_omap2()))
return -ENODEV;
spin_lock_init(&dm_timer_lock);
if (cpu_class_is_omap1()) {
dm_timers = omap1_dm_timers;
dm_timer_count = omap1_dm_timer_count;
map_size = SZ_2K;
} else if (cpu_is_omap24xx()) {
dm_timers = omap2_dm_timers;
dm_timer_count = omap2_dm_timer_count;
dm_source_names = omap2_dm_source_names;
dm_source_clocks = omap2_dm_source_clocks;
} else if (cpu_is_omap34xx()) {
dm_timers = omap3_dm_timers;
dm_timer_count = omap3_dm_timer_count;
dm_source_names = omap3_dm_source_names;
dm_source_clocks = omap3_dm_source_clocks;
} else if (cpu_is_omap44xx()) {
dm_timers = omap4_dm_timers;
dm_timer_count = omap4_dm_timer_count;
dm_source_names = omap4_dm_source_names;
dm_source_clocks = omap4_dm_source_clocks;
}
if (cpu_class_is_omap2())
for (i = 0; dm_source_names[i] != NULL; i++)
dm_source_clocks[i] = clk_get(NULL, dm_source_names[i]);
if (cpu_is_omap243x())
dm_timers[0].phys_base = 0x49018000;
for (i = 0; i < dm_timer_count; i++) {
timer = &dm_timers[i];
/* Static mapping, never released */
timer->io_base = ioremap(timer->phys_base, map_size);
BUG_ON(!timer->io_base);
#ifdef CONFIG_ARCH_OMAP2PLUS
if (cpu_class_is_omap2()) {
char clk_name[16];
sprintf(clk_name, "gpt%d_ick", i + 1);
timer->iclk = clk_get(NULL, clk_name);
sprintf(clk_name, "gpt%d_fck", i + 1);
timer->fclk = clk_get(NULL, clk_name);
}
#endif
}
return 0;
}