static inline struct ecap_pwm *to_ecap_pwm(const struct pwm_device *p)
{
return pwm_get_drvdata(p);
}
static int kona_pwmc_config(struct pwm_device *p, struct pwm_config *c)
{
struct kona_pwmc *ap = pwm_get_drvdata(p);
int chan = kona_get_chan(ap, p);
int ret = 0;
if (test_bit(PWM_CONFIG_POLARITY, &c->config_mask))
kona_pwmc_config_polarity(ap, chan, c);
if (test_bit(PWM_CONFIG_DUTY_TICKS, &c->config_mask))
kona_pwmc_config_duty_ticks(ap, chan, c);
if (test_bit(PWM_CONFIG_PERIOD_TICKS, &c->config_mask)) {
ret = kona_pwmc_config_period_ticks(ap, chan, c);
if (ret)
goto out;
if (!test_bit(PWM_CONFIG_DUTY_TICKS, &c->config_mask)) {
struct pwm_config d = {
.config_mask = PWM_CONFIG_DUTY_TICKS,
.duty_ticks = p->duty_ticks,
};
kona_pwmc_config_duty_ticks(ap, chan, &d);
}
}
if (!ap->pwm_started && test_bit(PWM_CONFIG_START, &c->config_mask)) {
/* Restore duty ticks cater for STOP case. */
struct pwm_config d = {
.config_mask = PWM_CONFIG_DUTY_TICKS,
.duty_ticks = p->duty_ticks,
};
ap->pwm_started = 1;
usleep_range(3000, 7000);
clk_enable(ap->clk);
kona_pwmc_clear_set_bit(ap, pwm_chan_ctrl_info[chan].offset,
pwm_chan_ctrl_info[chan].
smooth_type_shift, 1);
kona_pwmc_config_duty_ticks(ap, chan, &d);
kona_pwmc_start(ap, chan);
}
if (ap->pwm_started && test_bit(PWM_CONFIG_STOP, &c->config_mask)) {
struct pwm_config d = {
.config_mask = PWM_CONFIG_DUTY_TICKS,
.duty_ticks = 0,
};
ap->pwm_started = 0;
kona_pwmc_config_duty_ticks(ap, chan, &d);
kona_pwmc_clear_set_bit(ap, pwm_chan_ctrl_info[chan].offset,
pwm_chan_ctrl_info[chan].
smooth_type_shift, 0);
/* turn-off the PWM clock i.e. enabled during pwm_start */
ndelay(410);
clk_disable(ap->clk);
}
out:
return ret;
}
static int kona_pwmc_request(struct pwm_device *p)
{
struct kona_pwmc *ap = pwm_get_drvdata(p);
int chan = kona_get_chan(ap, p);
clk_enable(ap->clk);
p->tick_hz = clk_get_rate(ap->clk);
kona_pwmc_stop(ap, chan);
clk_disable(ap->clk);
return 0;
}
static void kona_pwmc_release(struct pwm_device *p)
{
}
static const struct pwm_device_ops kona_pwm_ops = {
.request = kona_pwmc_request,
.release = kona_pwmc_release,
.config = kona_pwmc_config,
.owner = THIS_MODULE,
};
static int __devinit kona_pwmc_probe(struct platform_device *pdev)
{
struct kona_pwmc *ap;
struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
int chan;
int ret = 0;
ap = kzalloc(sizeof(*ap), GFP_KERNEL);
if (!ap) {
ret = -ENOMEM;
goto err_kona_pwmc_alloc;
}
platform_set_drvdata(pdev, ap);
ap->clk = clk_get(&pdev->dev, "pwm_clk");
if (IS_ERR(ap->clk)) {
ret = -ENODEV;
goto err_clk_get;
}
ap->iobase = ioremap_nocache(r->start, resource_size(r));
if (!ap->iobase) {
ret = -ENODEV;
goto err_ioremap;
}
for (chan = 0; chan < KONA_PWM_CHANNEL_CNT; chan++) {
ap->p[chan] = pwm_register(&kona_pwm_ops, &pdev->dev, "%s:%d",
"kona_pwmc", chan);
if (IS_ERR_OR_NULL(ap->p[chan]))
goto err_pwm_register;
pwm_set_drvdata(ap->p[chan], ap);
kona_pwmc_clear_set_bit(ap, pwm_chan_ctrl_info[chan].offset,
pwm_chan_ctrl_info[chan].
smooth_type_shift, 1);
}
printk(KERN_INFO "PWM: driver initialized properly");
return 0;
err_pwm_register:
while (--chan > 0)
pwm_unregister(ap->p[chan]);
iounmap(ap->iobase);
err_ioremap:
clk_put(ap->clk);
err_clk_get:
platform_set_drvdata(pdev, NULL);
kfree(ap);
err_kona_pwmc_alloc:
printk(KERN_ERR "%s: error, returning %d\n", __func__, ret);
return ret;
}
static int __devexit kona_pwmc_remove(struct platform_device *pdev)
{
struct kona_pwmc *ap = platform_get_drvdata(pdev);
int chan;
for (chan = 0; chan < KONA_PWM_CHANNEL_CNT; chan++)
pwm_unregister(ap->p[chan]);
clk_put(ap->clk);
iounmap(ap->iobase);
kfree(ap);
return 0;
}
#ifdef CONFIG_PM
static int kona_pwmc_suspend(struct platform_device *pdev, pm_message_t state)
{
/* TODO: add more resume support in the future */
return 0;
}
static int kona_pwmc_resume(struct platform_device *pdev)
{
/* TODO: add more resume support in the future */
return 0;
}
#else
#define kona_pwmc_suspend NULL
#define kona_pwmc_resume NULL
#endif
static const struct of_device_id kona_pwmc_dt_ids[] = {
{ .compatible = "bcm,pwmc", },
{}
};