diff options
Diffstat (limited to 'arch/arm/plat-omap/clock.c')
| -rw-r--r-- | arch/arm/plat-omap/clock.c | 99 |
1 files changed, 71 insertions, 28 deletions
diff --git a/arch/arm/plat-omap/clock.c b/arch/arm/plat-omap/clock.c index fc62fb5fc20b..c9122dd6ee8d 100644 --- a/arch/arm/plat-omap/clock.c +++ b/arch/arm/plat-omap/clock.c @@ -37,14 +37,16 @@ static struct clk_functions *arch_clock; int clk_enable(struct clk *clk) { unsigned long flags; - int ret = 0; + int ret; if (clk == NULL || IS_ERR(clk)) return -EINVAL; + if (!arch_clock || !arch_clock->clk_enable) + return -EINVAL; + spin_lock_irqsave(&clockfw_lock, flags); - if (arch_clock->clk_enable) - ret = arch_clock->clk_enable(clk); + ret = arch_clock->clk_enable(clk); spin_unlock_irqrestore(&clockfw_lock, flags); return ret; @@ -58,6 +60,9 @@ void clk_disable(struct clk *clk) if (clk == NULL || IS_ERR(clk)) return; + if (!arch_clock || !arch_clock->clk_disable) + return; + spin_lock_irqsave(&clockfw_lock, flags); if (clk->usecount == 0) { pr_err("Trying disable clock %s with 0 usecount\n", @@ -66,8 +71,7 @@ void clk_disable(struct clk *clk) goto out; } - if (arch_clock->clk_disable) - arch_clock->clk_disable(clk); + arch_clock->clk_disable(clk); out: spin_unlock_irqrestore(&clockfw_lock, flags); @@ -77,7 +81,7 @@ EXPORT_SYMBOL(clk_disable); unsigned long clk_get_rate(struct clk *clk) { unsigned long flags; - unsigned long ret = 0; + unsigned long ret; if (clk == NULL || IS_ERR(clk)) return 0; @@ -97,14 +101,16 @@ EXPORT_SYMBOL(clk_get_rate); long clk_round_rate(struct clk *clk, unsigned long rate) { unsigned long flags; - long ret = 0; + long ret; if (clk == NULL || IS_ERR(clk)) - return ret; + return 0; + + if (!arch_clock || !arch_clock->clk_round_rate) + return 0; spin_lock_irqsave(&clockfw_lock, flags); - if (arch_clock->clk_round_rate) - ret = arch_clock->clk_round_rate(clk, rate); + ret = arch_clock->clk_round_rate(clk, rate); spin_unlock_irqrestore(&clockfw_lock, flags); return ret; @@ -119,14 +125,13 @@ int clk_set_rate(struct clk *clk, unsigned long rate) if (clk == NULL || IS_ERR(clk)) return ret; + if (!arch_clock || !arch_clock->clk_set_rate) + return ret; + spin_lock_irqsave(&clockfw_lock, flags); - if (arch_clock->clk_set_rate) - ret = arch_clock->clk_set_rate(clk, rate); - if (ret == 0) { - if (clk->recalc) - clk->rate = clk->recalc(clk); + ret = arch_clock->clk_set_rate(clk, rate); + if (ret == 0) propagate_rate(clk); - } spin_unlock_irqrestore(&clockfw_lock, flags); return ret; @@ -141,15 +146,14 @@ int clk_set_parent(struct clk *clk, struct clk *parent) if (clk == NULL || IS_ERR(clk) || parent == NULL || IS_ERR(parent)) return ret; + if (!arch_clock || !arch_clock->clk_set_parent) + return ret; + spin_lock_irqsave(&clockfw_lock, flags); if (clk->usecount == 0) { - if (arch_clock->clk_set_parent) - ret = arch_clock->clk_set_parent(clk, parent); - if (ret == 0) { - if (clk->recalc) - clk->rate = clk->recalc(clk); + ret = arch_clock->clk_set_parent(clk, parent); + if (ret == 0) propagate_rate(clk); - } } else ret = -EBUSY; spin_unlock_irqrestore(&clockfw_lock, flags); @@ -335,6 +339,38 @@ struct clk *omap_clk_get_by_name(const char *name) return ret; } +int omap_clk_enable_autoidle_all(void) +{ + struct clk *c; + unsigned long flags; + + spin_lock_irqsave(&clockfw_lock, flags); + + list_for_each_entry(c, &clocks, node) + if (c->ops->allow_idle) + c->ops->allow_idle(c); + + spin_unlock_irqrestore(&clockfw_lock, flags); + + return 0; +} + +int omap_clk_disable_autoidle_all(void) +{ + struct clk *c; + unsigned long flags; + + spin_lock_irqsave(&clockfw_lock, flags); + + list_for_each_entry(c, &clocks, node) + if (c->ops->deny_idle) + c->ops->deny_idle(c); + + spin_unlock_irqrestore(&clockfw_lock, flags); + + return 0; +} + /* * Low level helpers */ @@ -367,9 +403,11 @@ void clk_init_cpufreq_table(struct cpufreq_frequency_table **table) { unsigned long flags; + if (!arch_clock || !arch_clock->clk_init_cpufreq_table) + return; + spin_lock_irqsave(&clockfw_lock, flags); - if (arch_clock->clk_init_cpufreq_table) - arch_clock->clk_init_cpufreq_table(table); + arch_clock->clk_init_cpufreq_table(table); spin_unlock_irqrestore(&clockfw_lock, flags); } @@ -377,9 +415,11 @@ void clk_exit_cpufreq_table(struct cpufreq_frequency_table **table) { unsigned long flags; + if (!arch_clock || !arch_clock->clk_exit_cpufreq_table) + return; + spin_lock_irqsave(&clockfw_lock, flags); - if (arch_clock->clk_exit_cpufreq_table) - arch_clock->clk_exit_cpufreq_table(table); + arch_clock->clk_exit_cpufreq_table(table); spin_unlock_irqrestore(&clockfw_lock, flags); } #endif @@ -397,6 +437,9 @@ static int __init clk_disable_unused(void) struct clk *ck; unsigned long flags; + if (!arch_clock || !arch_clock->clk_disable_unused) + return 0; + pr_info("clock: disabling unused clocks to save power\n"); list_for_each_entry(ck, &clocks, node) { if (ck->ops == &clkops_null) @@ -406,14 +449,14 @@ static int __init clk_disable_unused(void) continue; spin_lock_irqsave(&clockfw_lock, flags); - if (arch_clock->clk_disable_unused) - arch_clock->clk_disable_unused(ck); + arch_clock->clk_disable_unused(ck); spin_unlock_irqrestore(&clockfw_lock, flags); } return 0; } late_initcall(clk_disable_unused); +late_initcall(omap_clk_enable_autoidle_all); #endif int __init clk_init(struct clk_functions * custom_clocks) |