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author | Kevin Hilman <khilman@mvista.com> | 2009-01-27 19:13:38 -0700 |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-02-08 17:50:28 +0000 |
commit | aeec299011da8c3f07a47fe5d988f0eafda53906 (patch) | |
tree | 8661476adf90325972e5feab723f1272ab04fc6b /arch/arm/mach-omap2/clock24xx.c | |
parent | ae8578c0194695bd37435249dfed720769a6bbf3 (diff) | |
download | kernel_samsung_smdk4412-aeec299011da8c3f07a47fe5d988f0eafda53906.zip kernel_samsung_smdk4412-aeec299011da8c3f07a47fe5d988f0eafda53906.tar.gz kernel_samsung_smdk4412-aeec299011da8c3f07a47fe5d988f0eafda53906.tar.bz2 |
[ARM] OMAP2: Implement CPUfreq frequency table based on PRCM table
This patch adds a CPUfreq frequency-table implementation for OMAP2 by
walking the PRCM rate-table for available entries and adding them to a
CPUfreq table.
CPUfreq can then be used to manage switching between all the available
entries in the PRCM rate table. Either use the CPUfreq sysfs
interface directly, (see Section 3 of Documentation/cpu-freq/user-guide.txt)
or use the cpufrequtils package:
http://www.kernel.org/pub/linux/utils/kernel/cpufreq/cpufrequtils.html
Signed-off-by: Kevin Hilman <khilman@mvista.com>
Updated to try to use cpufreq_table if it exists.
linux-omap source commit is 77ce544fa48deb7a2003f454624e3ca10d37ab87.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-omap2/clock24xx.c')
-rw-r--r-- | arch/arm/mach-omap2/clock24xx.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/clock24xx.c b/arch/arm/mach-omap2/clock24xx.c index 421728a..b990266 100644 --- a/arch/arm/mach-omap2/clock24xx.c +++ b/arch/arm/mach-omap2/clock24xx.c @@ -574,6 +574,45 @@ static int omap2_select_table_rate(struct clk *clk, unsigned long rate) return 0; } +#ifdef CONFIG_CPU_FREQ +/* + * Walk PRCM rate table and fillout cpufreq freq_table + */ +static struct cpufreq_frequency_table freq_table[ARRAY_SIZE(rate_table)]; + +void omap2_clk_init_cpufreq_table(struct cpufreq_frequency_table **table) +{ + struct prcm_config *prcm; + int i = 0; + + for (prcm = rate_table; prcm->mpu_speed; prcm++) { + if (!(prcm->flags & cpu_mask)) + continue; + if (prcm->xtal_speed != sys_ck.rate) + continue; + + /* don't put bypass rates in table */ + if (prcm->dpll_speed == prcm->xtal_speed) + continue; + + freq_table[i].index = i; + freq_table[i].frequency = prcm->mpu_speed / 1000; + i++; + } + + if (i == 0) { + printk(KERN_WARNING "%s: failed to initialize frequency " + "table\n", __func__); + return; + } + + freq_table[i].index = i; + freq_table[i].frequency = CPUFREQ_TABLE_END; + + *table = &freq_table[0]; +} +#endif + static struct clk_functions omap2_clk_functions = { .clk_enable = omap2_clk_enable, .clk_disable = omap2_clk_disable, @@ -581,6 +620,9 @@ static struct clk_functions omap2_clk_functions = { .clk_set_rate = omap2_clk_set_rate, .clk_set_parent = omap2_clk_set_parent, .clk_disable_unused = omap2_clk_disable_unused, +#ifdef CONFIG_CPU_FREQ + .clk_init_cpufreq_table = omap2_clk_init_cpufreq_table, +#endif }; static u32 omap2_get_apll_clkin(void) |