diff options
Diffstat (limited to 'drivers/clocksource/sh_cmt.c')
| -rw-r--r-- | drivers/clocksource/sh_cmt.c | 47 |
1 files changed, 27 insertions, 20 deletions
diff --git a/drivers/clocksource/sh_cmt.c b/drivers/clocksource/sh_cmt.c index 28757edf6aca..e09e8bf0bb9b 100644 --- a/drivers/clocksource/sh_cmt.c +++ b/drivers/clocksource/sh_cmt.c @@ -103,7 +103,6 @@ struct sh_cmt_channel { unsigned long match_value; unsigned long next_match_value; unsigned long max_match_value; - unsigned long rate; raw_spinlock_t lock; struct clock_event_device ced; struct clocksource cs; @@ -118,6 +117,7 @@ struct sh_cmt_device { void __iomem *mapbase; struct clk *clk; + unsigned long rate; raw_spinlock_t lock; /* Protect the shared start/stop register */ @@ -320,7 +320,7 @@ static void sh_cmt_start_stop_ch(struct sh_cmt_channel *ch, int start) raw_spin_unlock_irqrestore(&ch->cmt->lock, flags); } -static int sh_cmt_enable(struct sh_cmt_channel *ch, unsigned long *rate) +static int sh_cmt_enable(struct sh_cmt_channel *ch) { int k, ret; @@ -340,11 +340,9 @@ static int sh_cmt_enable(struct sh_cmt_channel *ch, unsigned long *rate) /* configure channel, periodic mode and maximum timeout */ if (ch->cmt->info->width == 16) { - *rate = clk_get_rate(ch->cmt->clk) / 512; sh_cmt_write_cmcsr(ch, SH_CMT16_CMCSR_CMIE | SH_CMT16_CMCSR_CKS512); } else { - *rate = clk_get_rate(ch->cmt->clk) / 8; sh_cmt_write_cmcsr(ch, SH_CMT32_CMCSR_CMM | SH_CMT32_CMCSR_CMTOUT_IE | SH_CMT32_CMCSR_CMR_IRQ | @@ -572,7 +570,7 @@ static int sh_cmt_start(struct sh_cmt_channel *ch, unsigned long flag) raw_spin_lock_irqsave(&ch->lock, flags); if (!(ch->flags & (FLAG_CLOCKEVENT | FLAG_CLOCKSOURCE))) - ret = sh_cmt_enable(ch, &ch->rate); + ret = sh_cmt_enable(ch); if (ret) goto out; @@ -640,10 +638,9 @@ static int sh_cmt_clocksource_enable(struct clocksource *cs) ch->total_cycles = 0; ret = sh_cmt_start(ch, FLAG_CLOCKSOURCE); - if (!ret) { - __clocksource_update_freq_hz(cs, ch->rate); + if (!ret) ch->cs_enabled = true; - } + return ret; } @@ -697,8 +694,7 @@ static int sh_cmt_register_clocksource(struct sh_cmt_channel *ch, dev_info(&ch->cmt->pdev->dev, "ch%u: used as clock source\n", ch->index); - /* Register with dummy 1 Hz value, gets updated in ->enable() */ - clocksource_register_hz(cs, 1); + clocksource_register_hz(cs, ch->cmt->rate); return 0; } @@ -709,19 +705,10 @@ static struct sh_cmt_channel *ced_to_sh_cmt(struct clock_event_device *ced) static void sh_cmt_clock_event_start(struct sh_cmt_channel *ch, int periodic) { - struct clock_event_device *ced = &ch->ced; - sh_cmt_start(ch, FLAG_CLOCKEVENT); - /* TODO: calculate good shift from rate and counter bit width */ - - ced->shift = 32; - ced->mult = div_sc(ch->rate, NSEC_PER_SEC, ced->shift); - ced->max_delta_ns = clockevent_delta2ns(ch->max_match_value, ced); - ced->min_delta_ns = clockevent_delta2ns(0x1f, ced); - if (periodic) - sh_cmt_set_next(ch, ((ch->rate + HZ/2) / HZ) - 1); + sh_cmt_set_next(ch, ((ch->cmt->rate + HZ/2) / HZ) - 1); else sh_cmt_set_next(ch, ch->max_match_value); } @@ -824,6 +811,14 @@ static int sh_cmt_register_clockevent(struct sh_cmt_channel *ch, ced->suspend = sh_cmt_clock_event_suspend; ced->resume = sh_cmt_clock_event_resume; + /* TODO: calculate good shift from rate and counter bit width */ + ced->shift = 32; + ced->mult = div_sc(ch->cmt->rate, NSEC_PER_SEC, ced->shift); + ced->max_delta_ns = clockevent_delta2ns(ch->max_match_value, ced); + ced->max_delta_ticks = ch->max_match_value; + ced->min_delta_ns = clockevent_delta2ns(0x1f, ced); + ced->min_delta_ticks = 0x1f; + dev_info(&ch->cmt->pdev->dev, "ch%u: used for clock events\n", ch->index); clockevents_register_device(ced); @@ -996,6 +991,18 @@ static int sh_cmt_setup(struct sh_cmt_device *cmt, struct platform_device *pdev) if (ret < 0) goto err_clk_put; + /* Determine clock rate. */ + ret = clk_enable(cmt->clk); + if (ret < 0) + goto err_clk_unprepare; + + if (cmt->info->width == 16) + cmt->rate = clk_get_rate(cmt->clk) / 512; + else + cmt->rate = clk_get_rate(cmt->clk) / 8; + + clk_disable(cmt->clk); + /* Map the memory resource(s). */ ret = sh_cmt_map_memory(cmt); if (ret < 0) |