static int sh_tmu_enable(struct sh_tmu_priv *p)
{
int ret;
/* enable clock */
ret = clk_enable(p->clk);
if (ret) {
dev_err(&p->pdev->dev, "cannot enable clock\n");
return ret;
}
/* make sure channel is disabled */
sh_tmu_start_stop_ch(p, 0);
/* maximum timeout */
sh_tmu_write(p, TCOR, 0xffffffff);
sh_tmu_write(p, TCNT, 0xffffffff);
/* configure channel to parent clock / 4, irq off */
p->rate = clk_get_rate(p->clk) / 4;
sh_tmu_write(p, TCR, 0x0000);
/* enable channel */
sh_tmu_start_stop_ch(p, 1);
return 0;
}
static int __sh_tmu_enable(struct sh_tmu_channel *ch)
{
int ret;
/* enable clock */
ret = clk_enable(ch->tmu->clk);
if (ret) {
dev_err(&ch->tmu->pdev->dev, "ch%u: cannot enable clock\n",
ch->index);
return ret;
}
/* make sure channel is disabled */
sh_tmu_start_stop_ch(ch, 0);
/* maximum timeout */
sh_tmu_write(ch, TCOR, 0xffffffff);
sh_tmu_write(ch, TCNT, 0xffffffff);
/* configure channel to parent clock / 4, irq off */
ch->rate = clk_get_rate(ch->tmu->clk) / 4;
sh_tmu_write(ch, TCR, TCR_TPSC_CLK4);
/* enable channel */
sh_tmu_start_stop_ch(ch, 1);
return 0;
}
static int sh_tmu_enable(struct sh_tmu_priv *p)
{
struct sh_timer_config *cfg = p->pdev->dev.platform_data;
int ret;
/* enable clock */
ret = clk_enable(p->clk);
if (ret) {
pr_err("sh_tmu: cannot enable clock \"%s\"\n", cfg->clk);
return ret;
}
/* make sure channel is disabled */
sh_tmu_start_stop_ch(p, 0);
/* maximum timeout */
sh_tmu_write(p, TCOR, 0xffffffff);
sh_tmu_write(p, TCNT, 0xffffffff);
/* configure channel to parent clock / 4, irq off */
p->rate = clk_get_rate(p->clk) / 4;
sh_tmu_write(p, TCR, 0x0000);
/* enable channel */
sh_tmu_start_stop_ch(p, 1);
return 0;
}
/* A Channel not used as clock source or for clock event (e.g. TMU2)
* can be used as generic timer and registered by another device. */
struct sh_timer_callb *sh_timer_register(void *handler, void *data)
{
struct sh_tmu_priv *p = NULL;
int ret, i;
/* As first element, look at the channel 2 because usually not
* used. */
char *c[] = { "sh_tmu.2", "sh_tmu.1", "sh_tmu.0" };
for (i = 0; i < ARRAY_SIZE(c); i++) {
struct device *dev = bus_find_device_by_name(&platform_bus_type,
NULL, c[i]);
if (dev) {
struct sh_timer_config *cfg = dev->platform_data;
if (!cfg->clockevent_rating &&
!cfg->clocksource_rating) {
p = dev_get_drvdata(dev);
break;
}
}
}
/* Check if the channel has been not already registered as timer. */
if ((p == NULL) || (p->tm.fnc != NULL))
return NULL;
if (handler == NULL) {
pr_err("sh_tmu: invalid handler\n");
return NULL;
}
p->tm.fnc = kmalloc(sizeof(struct sh_timer_callb *),
GFP_KERNEL);
if (p->tm.fnc == NULL)
return NULL;
/* Prepare the new handler */
p->irqaction.handler = sh_timer_interrupt;
p->tm.priv_handler = handler;
p->tm.data = data;
ret = setup_irq(p->irqaction.irq, &p->irqaction);
if (ret) {
pr_err("sh_tmu: failed to request irq %d\n", p->irqaction.irq);
return NULL;
}
/* Channel is stopped and irq off */
sh_timer_stop(p);
sh_tmu_write(p, TCOR, 0xffffffff);
sh_tmu_write(p, TCNT, 0xffffffff);
p->rate = clk_get_rate(p->clk) / 4;
p->tm.fnc->tmu_priv = p; /* hook to invoke the timer callbacks */
p->tm.fnc->timer_start = sh_timer_start;
p->tm.fnc->timer_stop = sh_timer_stop;
p->tm.fnc->set_rate = sh_timer_set_rate;
return p->tm.fnc;
}
static irqreturn_t sh_tmu_interrupt(int irq, void *dev_id)
{
struct sh_tmu_channel *ch = dev_id;
/* disable or acknowledge interrupt */
if (ch->ced.mode == CLOCK_EVT_MODE_ONESHOT)
sh_tmu_write(ch, TCR, TCR_TPSC_CLK4);
else
sh_tmu_write(ch, TCR, TCR_UNIE | TCR_TPSC_CLK4);
/* notify clockevent layer */
ch->ced.event_handler(&ch->ced);
return IRQ_HANDLED;
}
static irqreturn_t sh_tmu_interrupt(int irq, void *dev_id)
{
struct sh_tmu_priv *p = dev_id;
/* disable or acknowledge interrupt */
if (p->ced.mode == CLOCK_EVT_MODE_ONESHOT)
sh_tmu_write(p, TCR, 0x0000);
else
sh_tmu_write(p, TCR, 0x0020);
/* notify clockevent layer */
p->ced.event_handler(&p->ced);
return IRQ_HANDLED;
}
static void sh_timer_stop(void *priv)
{
struct sh_tmu_priv *p = priv;
sh_tmu_start_stop_ch(p, 0);
sh_tmu_write(p, TCR, 0x0000);
}
static irqreturn_t sh_timer_interrupt(int irq, void *dev_id)
{
struct sh_tmu_priv *p = dev_id;
sh_tmu_write(p, TCR, 0x0020);
p->tm.priv_handler(p->tm.data);
return IRQ_HANDLED;
}
static void __sh_tmu_disable(struct sh_tmu_channel *ch)
{
/* disable channel */
sh_tmu_start_stop_ch(ch, 0);
/* disable interrupts in TMU block */
sh_tmu_write(ch, TCR, TCR_TPSC_CLK4);
/* stop clock */
clk_disable(ch->tmu->clk);
}
static void sh_tmu_disable(struct sh_tmu_priv *p)
{
/* disable channel */
sh_tmu_start_stop_ch(p, 0);
/* disable interrupts in TMU block */
sh_tmu_write(p, TCR, 0x0000);
/* stop clock */
clk_disable(p->clk);
}
static void sh_tmu_set_next(struct sh_tmu_channel *ch, unsigned long delta,
int periodic)
{
/* stop timer */
sh_tmu_start_stop_ch(ch, 0);
/* acknowledge interrupt */
sh_tmu_read(ch, TCR);
/* enable interrupt */
sh_tmu_write(ch, TCR, TCR_UNIE | TCR_TPSC_CLK4);
/* reload delta value in case of periodic timer */
if (periodic)
sh_tmu_write(ch, TCOR, delta);
else
sh_tmu_write(ch, TCOR, 0xffffffff);
sh_tmu_write(ch, TCNT, delta);
/* start timer */
sh_tmu_start_stop_ch(ch, 1);
}
static void sh_tmu_set_next(struct sh_tmu_priv *p, unsigned long delta,
int periodic)
{
/* stop timer */
sh_tmu_start_stop_ch(p, 0);
/* acknowledge interrupt */
sh_tmu_read(p, TCR);
/* enable interrupt */
sh_tmu_write(p, TCR, 0x0020);
/* reload delta value in case of periodic timer */
if (periodic)
sh_tmu_write(p, TCOR, delta);
else
sh_tmu_write(p, TCOR, 0xffffffff);
sh_tmu_write(p, TCNT, delta);
/* start timer */
sh_tmu_start_stop_ch(p, 1);
}
static void sh_tmu_start_stop_ch(struct sh_tmu_channel *ch, int start)
{
unsigned long flags, value;
/* start stop register shared by multiple timer channels */
raw_spin_lock_irqsave(&ch->tmu->lock, flags);
value = sh_tmu_read(ch, TSTR);
if (start)
value |= 1 << ch->index;
else
value &= ~(1 << ch->index);
sh_tmu_write(ch, TSTR, value);
raw_spin_unlock_irqrestore(&ch->tmu->lock, flags);
}
static void sh_tmu_start_stop_ch(struct sh_tmu_priv *p, int start)
{
struct sh_timer_config *cfg = p->pdev->dev.platform_data;
unsigned long flags, value;
/* start stop register shared by multiple timer channels */
spin_lock_irqsave(&sh_tmu_lock, flags);
value = sh_tmu_read(p, TSTR);
if (start)
value |= 1 << cfg->timer_bit;
else
value &= ~(1 << cfg->timer_bit);
sh_tmu_write(p, TSTR, value);
spin_unlock_irqrestore(&sh_tmu_lock, flags);
}
