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author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-11-08 18:53:21 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-11-08 18:53:21 (GMT) |
commit | 8be5814c45d1412c6c16cf9be73e507f5fe53c1b (patch) | |
tree | e4e68924d536482fe47f004ed78aa89c965f38e8 /drivers/sh/clk/core.c | |
parent | d017bf6b4ff57db16a481a48bdad79274610a403 (diff) | |
parent | 21e14266284bf448faabb4485895d72d8af1f2d8 (diff) | |
download | linux-fsl-qoriq-8be5814c45d1412c6c16cf9be73e507f5fe53c1b.tar.xz |
Merge branch 'sh-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6
* 'sh-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6:
sh: clkfwk: Fix up checkpatch warnings.
sh: make some needlessly global sh7724 clocks static
sh: add clk_round_parent() to optimize parent clock rate
sh: Simplify phys_addr_mask()/PTE_PHYS_MASK for 29/32-bit.
sh: nommu: Support building without an uncached mapping.
sh: nommu: use 32-bit phys mode.
sh: mach-se: Fix up SE7206 no ioport build.
sh: intc: Update for single IRQ reservation helper.
sh: clkfwk: Fix up rate rounding error handling.
sh: mach-se: Rip out superfluous 7751 PIO routines.
sh: mach-se: Rip out superfluous 770x PIO routines.
sh: mach-edosk7705: Kill off machtype, consolidate board def.
sh: mach-edosk7705: update for this century, kill off PIO trapping.
sh: mach-se: Rip out superfluous 7206 PIO routines.
sh: mach-systemh: Kill off dead board.
sh: mach-snapgear: Kill off machtype, consolidate board def.
sh: mach-snapgear: Rip out superfluous PIO routines.
sh: mach-microdev: SuperIO-relative ioport mapping.
Diffstat (limited to 'drivers/sh/clk/core.c')
-rw-r--r-- | drivers/sh/clk/core.c | 96 |
1 files changed, 94 insertions, 2 deletions
diff --git a/drivers/sh/clk/core.c b/drivers/sh/clk/core.c index fd0d1b9..09615b5 100644 --- a/drivers/sh/clk/core.c +++ b/drivers/sh/clk/core.c @@ -90,8 +90,8 @@ struct clk_rate_round_data { static long clk_rate_round_helper(struct clk_rate_round_data *rounder) { unsigned long rate_error, rate_error_prev = ~0UL; - unsigned long rate_best_fit = rounder->rate; unsigned long highest, lowest, freq; + long rate_best_fit = -ENOENT; int i; highest = 0; @@ -146,7 +146,7 @@ long clk_rate_table_round(struct clk *clk, }; if (clk->nr_freqs < 1) - return 0; + return -ENOSYS; return clk_rate_round_helper(&table_round); } @@ -541,6 +541,98 @@ long clk_round_rate(struct clk *clk, unsigned long rate) } EXPORT_SYMBOL_GPL(clk_round_rate); +long clk_round_parent(struct clk *clk, unsigned long target, + unsigned long *best_freq, unsigned long *parent_freq, + unsigned int div_min, unsigned int div_max) +{ + struct cpufreq_frequency_table *freq, *best = NULL; + unsigned long error = ULONG_MAX, freq_high, freq_low, div; + struct clk *parent = clk_get_parent(clk); + + if (!parent) { + *parent_freq = 0; + *best_freq = clk_round_rate(clk, target); + return abs(target - *best_freq); + } + + for (freq = parent->freq_table; freq->frequency != CPUFREQ_TABLE_END; + freq++) { + if (freq->frequency == CPUFREQ_ENTRY_INVALID) + continue; + + if (unlikely(freq->frequency / target <= div_min - 1)) { + unsigned long freq_max; + + freq_max = (freq->frequency + div_min / 2) / div_min; + if (error > target - freq_max) { + error = target - freq_max; + best = freq; + if (best_freq) + *best_freq = freq_max; + } + + pr_debug("too low freq %lu, error %lu\n", freq->frequency, + target - freq_max); + + if (!error) + break; + + continue; + } + + if (unlikely(freq->frequency / target >= div_max)) { + unsigned long freq_min; + + freq_min = (freq->frequency + div_max / 2) / div_max; + if (error > freq_min - target) { + error = freq_min - target; + best = freq; + if (best_freq) + *best_freq = freq_min; + } + + pr_debug("too high freq %lu, error %lu\n", freq->frequency, + freq_min - target); + + if (!error) + break; + + continue; + } + + div = freq->frequency / target; + freq_high = freq->frequency / div; + freq_low = freq->frequency / (div + 1); + + if (freq_high - target < error) { + error = freq_high - target; + best = freq; + if (best_freq) + *best_freq = freq_high; + } + + if (target - freq_low < error) { + error = target - freq_low; + best = freq; + if (best_freq) + *best_freq = freq_low; + } + + pr_debug("%u / %lu = %lu, / %lu = %lu, best %lu, parent %u\n", + freq->frequency, div, freq_high, div + 1, freq_low, + *best_freq, best->frequency); + + if (!error) + break; + } + + if (parent_freq) + *parent_freq = best->frequency; + + return error; +} +EXPORT_SYMBOL_GPL(clk_round_parent); + #ifdef CONFIG_PM static int clks_sysdev_suspend(struct sys_device *dev, pm_message_t state) { |