diff options
| -rw-r--r-- | drivers/clocksource/sh_mtu2.c | 125 |
1 files changed, 69 insertions, 56 deletions
diff --git a/drivers/clocksource/sh_mtu2.c b/drivers/clocksource/sh_mtu2.c index 66684552fcc9..e509f417ef64 100644 --- a/drivers/clocksource/sh_mtu2.c +++ b/drivers/clocksource/sh_mtu2.c @@ -34,12 +34,21 @@ #include <linux/pm_domain.h> #include <linux/pm_runtime.h> +struct sh_mtu2_priv; + +struct sh_mtu2_channel { + struct sh_mtu2_priv *mtu; + int irq; + struct clock_event_device ced; +}; + struct sh_mtu2_priv { + struct platform_device *pdev; + void __iomem *mapbase; struct clk *clk; - int irq; - struct platform_device *pdev; - struct clock_event_device ced; + + struct sh_mtu2_channel channel; }; static DEFINE_RAW_SPINLOCK(sh_mtu2_lock); @@ -63,10 +72,10 @@ static unsigned long mtu2_reg_offs[] = { [TGR] = 8, }; -static inline unsigned long sh_mtu2_read(struct sh_mtu2_priv *p, int reg_nr) +static inline unsigned long sh_mtu2_read(struct sh_mtu2_channel *ch, int reg_nr) { - struct sh_timer_config *cfg = p->pdev->dev.platform_data; - void __iomem *base = p->mapbase; + struct sh_timer_config *cfg = ch->mtu->pdev->dev.platform_data; + void __iomem *base = ch->mtu->mapbase; unsigned long offs; if (reg_nr == TSTR) @@ -80,11 +89,11 @@ static inline unsigned long sh_mtu2_read(struct sh_mtu2_priv *p, int reg_nr) return ioread8(base + offs); } -static inline void sh_mtu2_write(struct sh_mtu2_priv *p, int reg_nr, +static inline void sh_mtu2_write(struct sh_mtu2_channel *ch, int reg_nr, unsigned long value) { - struct sh_timer_config *cfg = p->pdev->dev.platform_data; - void __iomem *base = p->mapbase; + struct sh_timer_config *cfg = ch->mtu->pdev->dev.platform_data; + void __iomem *base = ch->mtu->mapbase; unsigned long offs; if (reg_nr == TSTR) { @@ -100,100 +109,100 @@ static inline void sh_mtu2_write(struct sh_mtu2_priv *p, int reg_nr, iowrite8(value, base + offs); } -static void sh_mtu2_start_stop_ch(struct sh_mtu2_priv *p, int start) +static void sh_mtu2_start_stop_ch(struct sh_mtu2_channel *ch, int start) { - struct sh_timer_config *cfg = p->pdev->dev.platform_data; + struct sh_timer_config *cfg = ch->mtu->pdev->dev.platform_data; unsigned long flags, value; /* start stop register shared by multiple timer channels */ raw_spin_lock_irqsave(&sh_mtu2_lock, flags); - value = sh_mtu2_read(p, TSTR); + value = sh_mtu2_read(ch, TSTR); if (start) value |= 1 << cfg->timer_bit; else value &= ~(1 << cfg->timer_bit); - sh_mtu2_write(p, TSTR, value); + sh_mtu2_write(ch, TSTR, value); raw_spin_unlock_irqrestore(&sh_mtu2_lock, flags); } -static int sh_mtu2_enable(struct sh_mtu2_priv *p) +static int sh_mtu2_enable(struct sh_mtu2_channel *ch) { unsigned long periodic; unsigned long rate; int ret; - pm_runtime_get_sync(&p->pdev->dev); - dev_pm_syscore_device(&p->pdev->dev, true); + pm_runtime_get_sync(&ch->mtu->pdev->dev); + dev_pm_syscore_device(&ch->mtu->pdev->dev, true); /* enable clock */ - ret = clk_enable(p->clk); + ret = clk_enable(ch->mtu->clk); if (ret) { - dev_err(&p->pdev->dev, "cannot enable clock\n"); + dev_err(&ch->mtu->pdev->dev, "cannot enable clock\n"); return ret; } /* make sure channel is disabled */ - sh_mtu2_start_stop_ch(p, 0); + sh_mtu2_start_stop_ch(ch, 0); - rate = clk_get_rate(p->clk) / 64; + rate = clk_get_rate(ch->mtu->clk) / 64; periodic = (rate + HZ/2) / HZ; /* "Periodic Counter Operation" */ - sh_mtu2_write(p, TCR, 0x23); /* TGRA clear, divide clock by 64 */ - sh_mtu2_write(p, TIOR, 0); - sh_mtu2_write(p, TGR, periodic); - sh_mtu2_write(p, TCNT, 0); - sh_mtu2_write(p, TMDR, 0); - sh_mtu2_write(p, TIER, 0x01); + sh_mtu2_write(ch, TCR, 0x23); /* TGRA clear, divide clock by 64 */ + sh_mtu2_write(ch, TIOR, 0); + sh_mtu2_write(ch, TGR, periodic); + sh_mtu2_write(ch, TCNT, 0); + sh_mtu2_write(ch, TMDR, 0); + sh_mtu2_write(ch, TIER, 0x01); /* enable channel */ - sh_mtu2_start_stop_ch(p, 1); + sh_mtu2_start_stop_ch(ch, 1); return 0; } -static void sh_mtu2_disable(struct sh_mtu2_priv *p) +static void sh_mtu2_disable(struct sh_mtu2_channel *ch) { /* disable channel */ - sh_mtu2_start_stop_ch(p, 0); + sh_mtu2_start_stop_ch(ch, 0); /* stop clock */ - clk_disable(p->clk); + clk_disable(ch->mtu->clk); - dev_pm_syscore_device(&p->pdev->dev, false); - pm_runtime_put(&p->pdev->dev); + dev_pm_syscore_device(&ch->mtu->pdev->dev, false); + pm_runtime_put(&ch->mtu->pdev->dev); } static irqreturn_t sh_mtu2_interrupt(int irq, void *dev_id) { - struct sh_mtu2_priv *p = dev_id; + struct sh_mtu2_channel *ch = dev_id; /* acknowledge interrupt */ - sh_mtu2_read(p, TSR); - sh_mtu2_write(p, TSR, 0xfe); + sh_mtu2_read(ch, TSR); + sh_mtu2_write(ch, TSR, 0xfe); /* notify clockevent layer */ - p->ced.event_handler(&p->ced); + ch->ced.event_handler(&ch->ced); return IRQ_HANDLED; } -static struct sh_mtu2_priv *ced_to_sh_mtu2(struct clock_event_device *ced) +static struct sh_mtu2_channel *ced_to_sh_mtu2(struct clock_event_device *ced) { - return container_of(ced, struct sh_mtu2_priv, ced); + return container_of(ced, struct sh_mtu2_channel, ced); } static void sh_mtu2_clock_event_mode(enum clock_event_mode mode, struct clock_event_device *ced) { - struct sh_mtu2_priv *p = ced_to_sh_mtu2(ced); + struct sh_mtu2_channel *ch = ced_to_sh_mtu2(ced); int disabled = 0; /* deal with old setting first */ switch (ced->mode) { case CLOCK_EVT_MODE_PERIODIC: - sh_mtu2_disable(p); + sh_mtu2_disable(ch); disabled = 1; break; default: @@ -202,12 +211,13 @@ static void sh_mtu2_clock_event_mode(enum clock_event_mode mode, switch (mode) { case CLOCK_EVT_MODE_PERIODIC: - dev_info(&p->pdev->dev, "used for periodic clock events\n"); - sh_mtu2_enable(p); + dev_info(&ch->mtu->pdev->dev, + "used for periodic clock events\n"); + sh_mtu2_enable(ch); break; case CLOCK_EVT_MODE_UNUSED: if (!disabled) - sh_mtu2_disable(p); + sh_mtu2_disable(ch); break; case CLOCK_EVT_MODE_SHUTDOWN: default: @@ -217,18 +227,18 @@ static void sh_mtu2_clock_event_mode(enum clock_event_mode mode, static void sh_mtu2_clock_event_suspend(struct clock_event_device *ced) { - pm_genpd_syscore_poweroff(&ced_to_sh_mtu2(ced)->pdev->dev); + pm_genpd_syscore_poweroff(&ced_to_sh_mtu2(ced)->mtu->pdev->dev); } static void sh_mtu2_clock_event_resume(struct clock_event_device *ced) { - pm_genpd_syscore_poweron(&ced_to_sh_mtu2(ced)->pdev->dev); + pm_genpd_syscore_poweron(&ced_to_sh_mtu2(ced)->mtu->pdev->dev); } -static void sh_mtu2_register_clockevent(struct sh_mtu2_priv *p, +static void sh_mtu2_register_clockevent(struct sh_mtu2_channel *ch, char *name, unsigned long rating) { - struct clock_event_device *ced = &p->ced; + struct clock_event_device *ced = &ch->ced; int ret; memset(ced, 0, sizeof(*ced)); @@ -241,23 +251,24 @@ static void sh_mtu2_register_clockevent(struct sh_mtu2_priv *p, ced->suspend = sh_mtu2_clock_event_suspend; ced->resume = sh_mtu2_clock_event_resume; - dev_info(&p->pdev->dev, "used for clock events\n"); + dev_info(&ch->mtu->pdev->dev, "used for clock events\n"); clockevents_register_device(ced); - ret = request_irq(p->irq, sh_mtu2_interrupt, + ret = request_irq(ch->irq, sh_mtu2_interrupt, IRQF_TIMER | IRQF_IRQPOLL | IRQF_NOBALANCING, - dev_name(&p->pdev->dev), p); + dev_name(&ch->mtu->pdev->dev), ch); if (ret) { - dev_err(&p->pdev->dev, "failed to request irq %d\n", p->irq); + dev_err(&ch->mtu->pdev->dev, "failed to request irq %d\n", + ch->irq); return; } } -static int sh_mtu2_register(struct sh_mtu2_priv *p, char *name, +static int sh_mtu2_register(struct sh_mtu2_channel *ch, char *name, unsigned long clockevent_rating) { if (clockevent_rating) - sh_mtu2_register_clockevent(p, name, clockevent_rating); + sh_mtu2_register_clockevent(ch, name, clockevent_rating); return 0; } @@ -285,8 +296,8 @@ static int sh_mtu2_setup(struct sh_mtu2_priv *p, struct platform_device *pdev) goto err0; } - p->irq = platform_get_irq(p->pdev, 0); - if (p->irq < 0) { + p->channel.irq = platform_get_irq(p->pdev, 0); + if (p->channel.irq < 0) { dev_err(&p->pdev->dev, "failed to get irq\n"); goto err0; } @@ -310,7 +321,9 @@ static int sh_mtu2_setup(struct sh_mtu2_priv *p, struct platform_device *pdev) if (ret < 0) goto err2; - ret = sh_mtu2_register(p, (char *)dev_name(&p->pdev->dev), + p->channel.mtu = p; + + ret = sh_mtu2_register(&p->channel, (char *)dev_name(&p->pdev->dev), cfg->clockevent_rating); if (ret < 0) goto err3; |