diff options
Diffstat (limited to 'drivers/clocksource/sh_cmt.c')
-rw-r--r-- | drivers/clocksource/sh_cmt.c | 127 |
1 files changed, 59 insertions, 68 deletions
diff --git a/drivers/clocksource/sh_cmt.c b/drivers/clocksource/sh_cmt.c index 6b3e0c2f33e2..717305d30444 100644 --- a/drivers/clocksource/sh_cmt.c +++ b/drivers/clocksource/sh_cmt.c @@ -29,6 +29,7 @@ #include <linux/clocksource.h> #include <linux/clockchips.h> #include <linux/sh_timer.h> +#include <linux/slab.h> struct sh_cmt_priv { void __iomem *mapbase; @@ -40,7 +41,6 @@ struct sh_cmt_priv { struct platform_device *pdev; unsigned long flags; - unsigned long flags_suspend; unsigned long match_value; unsigned long next_match_value; unsigned long max_match_value; @@ -150,13 +150,12 @@ static void sh_cmt_start_stop_ch(struct sh_cmt_priv *p, int start) static int sh_cmt_enable(struct sh_cmt_priv *p, unsigned long *rate) { - struct sh_timer_config *cfg = p->pdev->dev.platform_data; int ret; /* enable clock */ ret = clk_enable(p->clk); if (ret) { - pr_err("sh_cmt: cannot enable clock \"%s\"\n", cfg->clk); + dev_err(&p->pdev->dev, "cannot enable clock\n"); return ret; } @@ -279,7 +278,7 @@ static void sh_cmt_clock_event_program_verify(struct sh_cmt_priv *p, delay = 1; if (!delay) - pr_warning("sh_cmt: too long delay\n"); + dev_warn(&p->pdev->dev, "too long delay\n"); } while (delay); } @@ -289,7 +288,7 @@ static void sh_cmt_set_next(struct sh_cmt_priv *p, unsigned long delta) unsigned long flags; if (delta > p->max_match_value) - pr_warning("sh_cmt: delta out of range\n"); + dev_warn(&p->pdev->dev, "delta out of range\n"); spin_lock_irqsave(&p->lock, flags); p->next_match_value = delta; @@ -413,18 +412,10 @@ static cycle_t sh_cmt_clocksource_read(struct clocksource *cs) static int sh_cmt_clocksource_enable(struct clocksource *cs) { struct sh_cmt_priv *p = cs_to_sh_cmt(cs); - int ret; p->total_cycles = 0; - ret = sh_cmt_start(p, FLAG_CLOCKSOURCE); - if (ret) - return ret; - - /* TODO: calculate good shift from rate and counter bit width */ - cs->shift = 0; - cs->mult = clocksource_hz2mult(p->rate, cs->shift); - return 0; + return sh_cmt_start(p, FLAG_CLOCKSOURCE); } static void sh_cmt_clocksource_disable(struct clocksource *cs) @@ -432,6 +423,11 @@ static void sh_cmt_clocksource_disable(struct clocksource *cs) sh_cmt_stop(cs_to_sh_cmt(cs), FLAG_CLOCKSOURCE); } +static void sh_cmt_clocksource_resume(struct clocksource *cs) +{ + sh_cmt_start(cs_to_sh_cmt(cs), FLAG_CLOCKSOURCE); +} + static int sh_cmt_register_clocksource(struct sh_cmt_priv *p, char *name, unsigned long rating) { @@ -442,10 +438,24 @@ static int sh_cmt_register_clocksource(struct sh_cmt_priv *p, cs->read = sh_cmt_clocksource_read; cs->enable = sh_cmt_clocksource_enable; cs->disable = sh_cmt_clocksource_disable; + cs->suspend = sh_cmt_clocksource_disable; + cs->resume = sh_cmt_clocksource_resume; cs->mask = CLOCKSOURCE_MASK(sizeof(unsigned long) * 8); cs->flags = CLOCK_SOURCE_IS_CONTINUOUS; - pr_info("sh_cmt: %s used as clock source\n", cs->name); + + /* clk_get_rate() needs an enabled clock */ + clk_enable(p->clk); + p->rate = clk_get_rate(p->clk) / (p->width == 16) ? 512 : 8; + clk_disable(p->clk); + + /* TODO: calculate good shift from rate and counter bit width */ + cs->shift = 0; + cs->mult = clocksource_hz2mult(p->rate, cs->shift); + + dev_info(&p->pdev->dev, "used as clock source\n"); + clocksource_register(cs); + return 0; } @@ -490,13 +500,11 @@ static void sh_cmt_clock_event_mode(enum clock_event_mode mode, switch (mode) { case CLOCK_EVT_MODE_PERIODIC: - pr_info("sh_cmt: %s used for periodic clock events\n", - ced->name); + dev_info(&p->pdev->dev, "used for periodic clock events\n"); sh_cmt_clock_event_start(p, 1); break; case CLOCK_EVT_MODE_ONESHOT: - pr_info("sh_cmt: %s used for oneshot clock events\n", - ced->name); + dev_info(&p->pdev->dev, "used for oneshot clock events\n"); sh_cmt_clock_event_start(p, 0); break; case CLOCK_EVT_MODE_SHUTDOWN: @@ -537,7 +545,7 @@ static void sh_cmt_register_clockevent(struct sh_cmt_priv *p, ced->set_next_event = sh_cmt_clock_event_next; ced->set_mode = sh_cmt_clock_event_mode; - pr_info("sh_cmt: %s used for clock events\n", ced->name); + dev_info(&p->pdev->dev, "used for clock events\n"); clockevents_register_device(ced); } @@ -594,27 +602,27 @@ static int sh_cmt_setup(struct sh_cmt_priv *p, struct platform_device *pdev) /* map memory, let mapbase point to our channel */ p->mapbase = ioremap_nocache(res->start, resource_size(res)); if (p->mapbase == NULL) { - pr_err("sh_cmt: failed to remap I/O memory\n"); + dev_err(&p->pdev->dev, "failed to remap I/O memory\n"); goto err0; } /* request irq using setup_irq() (too early for request_irq()) */ - p->irqaction.name = cfg->name; + p->irqaction.name = dev_name(&p->pdev->dev); p->irqaction.handler = sh_cmt_interrupt; p->irqaction.dev_id = p; - p->irqaction.flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL; - ret = setup_irq(irq, &p->irqaction); - if (ret) { - pr_err("sh_cmt: failed to request irq %d\n", irq); - goto err1; - } + p->irqaction.flags = IRQF_DISABLED | IRQF_TIMER | \ + IRQF_IRQPOLL | IRQF_NOBALANCING; /* get hold of clock */ - p->clk = clk_get(&p->pdev->dev, cfg->clk); + p->clk = clk_get(&p->pdev->dev, "cmt_fck"); if (IS_ERR(p->clk)) { - pr_err("sh_cmt: cannot get clock \"%s\"\n", cfg->clk); - ret = PTR_ERR(p->clk); - goto err2; + dev_warn(&p->pdev->dev, "using deprecated clock lookup\n"); + p->clk = clk_get(&p->pdev->dev, cfg->clk); + if (IS_ERR(p->clk)) { + dev_err(&p->pdev->dev, "cannot get clock\n"); + ret = PTR_ERR(p->clk); + goto err1; + } } if (resource_size(res) == 6) { @@ -627,25 +635,35 @@ static int sh_cmt_setup(struct sh_cmt_priv *p, struct platform_device *pdev) p->clear_bits = ~0xc000; } - return sh_cmt_register(p, cfg->name, - cfg->clockevent_rating, - cfg->clocksource_rating); - err2: - remove_irq(irq, &p->irqaction); - err1: + ret = sh_cmt_register(p, (char *)dev_name(&p->pdev->dev), + cfg->clockevent_rating, + cfg->clocksource_rating); + if (ret) { + dev_err(&p->pdev->dev, "registration failed\n"); + goto err1; + } + + ret = setup_irq(irq, &p->irqaction); + if (ret) { + dev_err(&p->pdev->dev, "failed to request irq %d\n", irq); + goto err1; + } + + return 0; + +err1: iounmap(p->mapbase); - err0: +err0: return ret; } static int __devinit sh_cmt_probe(struct platform_device *pdev) { struct sh_cmt_priv *p = platform_get_drvdata(pdev); - struct sh_timer_config *cfg = pdev->dev.platform_data; int ret; if (p) { - pr_info("sh_cmt: %s kept as earlytimer\n", cfg->name); + dev_info(&pdev->dev, "kept as earlytimer\n"); return 0; } @@ -668,38 +686,11 @@ static int __devexit sh_cmt_remove(struct platform_device *pdev) return -EBUSY; /* cannot unregister clockevent and clocksource */ } -static int sh_cmt_suspend(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct sh_cmt_priv *p = platform_get_drvdata(pdev); - - /* save flag state and stop CMT channel */ - p->flags_suspend = p->flags; - sh_cmt_stop(p, p->flags); - return 0; -} - -static int sh_cmt_resume(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct sh_cmt_priv *p = platform_get_drvdata(pdev); - - /* start CMT channel from saved state */ - sh_cmt_start(p, p->flags_suspend); - return 0; -} - -static struct dev_pm_ops sh_cmt_dev_pm_ops = { - .suspend = sh_cmt_suspend, - .resume = sh_cmt_resume, -}; - static struct platform_driver sh_cmt_device_driver = { .probe = sh_cmt_probe, .remove = __devexit_p(sh_cmt_remove), .driver = { .name = "sh_cmt", - .pm = &sh_cmt_dev_pm_ops, } }; |