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| author | Florian Fainelli <florian@openwrt.org> | 2012-12-06 22:39:52 +0000 |
|---|---|---|
| committer | Florian Fainelli <florian@openwrt.org> | 2012-12-06 22:39:52 +0000 |
| commit | e37f6fb458314d24de119b9bba1b8a28a9379839 (patch) | |
| tree | c5a1033f4c0d0dc2ba75a6a5dc189985e2f3ea85 /target/linux/adm8668 | |
| parent | 79c2ce01b718eb9f104a45e2339c5211b95e37a4 (diff) | |
| download | mtk-20170518-e37f6fb458314d24de119b9bba1b8a28a9379839.zip mtk-20170518-e37f6fb458314d24de119b9bba1b8a28a9379839.tar.gz mtk-20170518-e37f6fb458314d24de119b9bba1b8a28a9379839.tar.bz2 | |
provide a system clock to be used by the MIPS timer
Signed-off-by: Florian Fainelli <florian@openwrt.org>
SVN-Revision: 34550
Diffstat (limited to 'target/linux/adm8668')
4 files changed, 33 insertions, 8 deletions
diff --git a/target/linux/adm8668/files/arch/mips/adm8668/Makefile b/target/linux/adm8668/files/arch/mips/adm8668/Makefile index ed45666..aff789c 100644 --- a/target/linux/adm8668/files/arch/mips/adm8668/Makefile +++ b/target/linux/adm8668/files/arch/mips/adm8668/Makefile @@ -3,5 +3,5 @@ # obj-y := irq.o pci.o prom.o platform.o proc.o \ - setup.o time.o early_printk.o clock.o \ + setup.o clock.o time.o early_printk.o \ net_core.o net_intr.o diff --git a/target/linux/adm8668/files/arch/mips/adm8668/clock.c b/target/linux/adm8668/files/arch/mips/adm8668/clock.c index 96d139e..6c839a2 100644 --- a/target/linux/adm8668/files/arch/mips/adm8668/clock.c +++ b/target/linux/adm8668/files/arch/mips/adm8668/clock.c @@ -22,12 +22,19 @@ static struct clk uart_clk = { .rate = ADM8668_UARTCLK_FREQ, }; +static struct clk sys_clk; + struct clk *clk_get(struct device *dev, const char *id) { - const char *name = dev_name(dev); + const char *lookup = id; + + if (dev) + lookup = dev_name(dev); - if (!strcmp(name, "apb:uart0")) + if (!strcmp(lookup, "apb:uart0")) return &uart_clk; + if (!strcmp(lookup, "sys")) + return &sys_clk; return ERR_PTR(-ENOENT); } @@ -54,3 +61,16 @@ void clk_put(struct clk *clk) { } EXPORT_SYMBOL(clk_put); + +void __init adm8668_init_clocks(void) +{ + u32 adj; + + /* adjustable clock selection + * CR3 bit 14~11, 0000 -> 175MHz, 0001 -> 180MHz, etc... + */ + adj = (ADM8668_CONFIG_REG(ADM8668_CR3) >> 11) & 0xf; + sys_clk.rate = SYS_CLOCK + adj * 5000000; + + pr_info("ADM8668 CPU clock: %lu MHz\n", sys_clk.rate / 1000000); +} diff --git a/target/linux/adm8668/files/arch/mips/adm8668/time.c b/target/linux/adm8668/files/arch/mips/adm8668/time.c index 047bccd..87bdd66 100644 --- a/target/linux/adm8668/files/arch/mips/adm8668/time.c +++ b/target/linux/adm8668/files/arch/mips/adm8668/time.c @@ -1,17 +1,20 @@ #include <linux/init.h> #include <linux/kernel.h> +#include <linux/clk.h> #include <asm/time.h> #include <adm8668.h> void __init plat_time_init(void) { - int adj = (ADM8668_CONFIG_REG(ADM8668_CR3) >> 11) & 0xf; + struct clk *sys_clk; - /* adjustable clock selection - CR3 bit 14~11, 0000 -> 175MHz, 0001 -> 180MHz, etc... */ + adm8668_init_clocks(); - mips_hpt_frequency = (SYS_CLOCK + adj * 5000000) / 2; - printk("ADM8668 CPU clock: %d MHz\n", 2*mips_hpt_frequency / 1000000); + sys_clk = clk_get(NULL, "sys"); + if (IS_ERR(sys_clk)) + panic("unable to get system clock\n"); + + mips_hpt_frequency = clk_get_rate(sys_clk) / 2; } diff --git a/target/linux/adm8668/files/arch/mips/include/asm/mach-adm8668/adm8668.h b/target/linux/adm8668/files/arch/mips/include/asm/mach-adm8668/adm8668.h index 1f7ab72..bb4466c 100644 --- a/target/linux/adm8668/files/arch/mips/include/asm/mach-adm8668/adm8668.h +++ b/target/linux/adm8668/files/arch/mips/include/asm/mach-adm8668/adm8668.h @@ -109,4 +109,6 @@ #define CRGPIO_TOGGLE(num) \ ADM8668_CONFIG_REG(CRGPIO_REG) ^= (1 << (6 + num)) +void adm8668_init_clocks(void); + #endif /* __ADM8668_H__ */ |