diff options
Diffstat (limited to 'arch/arm/include/asm/arch-tegra/clock.h')
-rw-r--r-- | arch/arm/include/asm/arch-tegra/clock.h | 59 |
1 files changed, 57 insertions, 2 deletions
diff --git a/arch/arm/include/asm/arch-tegra/clock.h b/arch/arm/include/asm/arch-tegra/clock.h index 01f86ab..c8677bd 100644 --- a/arch/arm/include/asm/arch-tegra/clock.h +++ b/arch/arm/include/asm/arch-tegra/clock.h @@ -82,7 +82,7 @@ int clock_set_pllout(enum clock_id clkid, enum pll_out_id pllout, * @returns 0 if ok, -1 on error (invalid clock id) */ int clock_ll_read_pll(enum clock_id clkid, u32 *divm, u32 *divn, - u32 *divp, u32 *cpcon, u32 *lfcon); + u32 *divp, u32 *cpcon, u32 *lfcon); /* * Enable a clock @@ -262,4 +262,59 @@ void clock_init(void); /* Initialize the PLLs */ void clock_early_init(void); -#endif /* _TEGRA_CLOCK_H_ */ +/* Returns a pointer to the clock source register for a peripheral */ +u32 *get_periph_source_reg(enum periph_id periph_id); + +/** + * Given a peripheral ID and the required source clock, this returns which + * value should be programmed into the source mux for that peripheral. + * + * There is special code here to handle the one source type with 5 sources. + * + * @param periph_id peripheral to start + * @param source PLL id of required parent clock + * @param mux_bits Set to number of bits in mux register: 2 or 4 + * @param divider_bits Set to number of divider bits (8 or 16) + * @return mux value (0-4, or -1 if not found) + */ +int get_periph_clock_source(enum periph_id periph_id, + enum clock_id parent, int *mux_bits, int *divider_bits); + +/* + * Convert a device tree clock ID to our peripheral ID. They are mostly + * the same but we are very cautious so we check that a valid clock ID is + * provided. + * + * @param clk_id Clock ID according to tegra30 device tree binding + * @return peripheral ID, or PERIPH_ID_NONE if the clock ID is invalid + */ +enum periph_id clk_id_to_periph_id(int clk_id); + +/** + * Set the output frequency you want for each PLL clock. + * PLL output frequencies are programmed by setting their N, M and P values. + * The governing equations are: + * VCO = (Fi / m) * n, Fo = VCO / (2^p) + * where Fo is the output frequency from the PLL. + * Example: Set the output frequency to 216Mhz(Fo) with 12Mhz OSC(Fi) + * 216Mhz = ((12Mhz / m) * n) / (2^p) so n=432,m=12,p=1 + * Please see Tegra TRM section 5.3 to get the detail for PLL Programming + * + * @param n PLL feedback divider(DIVN) + * @param m PLL input divider(DIVN) + * @param p post divider(DIVP) + * @param cpcon base PLL charge pump(CPCON) + * @return 0 if ok, -1 on error (the requested PLL is incorrect and cannot + * be overriden), 1 if PLL is already correct + */ +int clock_set_rate(enum clock_id clkid, u32 n, u32 m, u32 p, u32 cpcon); + +/* return 1 if a peripheral ID is in range */ +#define clock_type_id_isvalid(id) ((id) >= 0 && \ + (id) < CLOCK_TYPE_COUNT) + +/* return 1 if a periphc_internal_id is in range */ +#define periphc_internal_id_isvalid(id) ((id) >= 0 && \ + (id) < PERIPHC_COUNT) + +#endif /* _TEGRA_CLOCK_H_ */ |