diff options
Diffstat (limited to 'arch/arm/mach-omap2/clock34xx.c')
| -rw-r--r-- | arch/arm/mach-omap2/clock34xx.c | 37 |
1 files changed, 36 insertions, 1 deletions
diff --git a/arch/arm/mach-omap2/clock34xx.c b/arch/arm/mach-omap2/clock34xx.c index fafcd32e6907..7c5c00df3c70 100644 --- a/arch/arm/mach-omap2/clock34xx.c +++ b/arch/arm/mach-omap2/clock34xx.c @@ -338,6 +338,13 @@ static struct omap_clk omap34xx_clks[] = { */ #define SDRC_MPURATE_LOOPS 96 +/* + * DPLL5_FREQ_FOR_USBHOST: USBHOST and USBTLL are the only clocks + * that are sourced by DPLL5, and both of these require this clock + * to be at 120 MHz for proper operation. + */ +#define DPLL5_FREQ_FOR_USBHOST 120000000 + /** * omap3430es2_clk_ssi_find_idlest - return CM_IDLEST info for SSI * @clk: struct clk * being enabled @@ -466,7 +473,7 @@ static u16 _omap3_dpll_compute_freqsel(struct clk *clk, u8 n) unsigned long fint; u16 f = 0; - fint = clk->dpll_data->clk_ref->rate / (n + 1); + fint = clk->dpll_data->clk_ref->rate / n; pr_debug("clock: fint is %lu\n", fint); @@ -1056,6 +1063,28 @@ void omap2_clk_prepare_for_reboot(void) #endif } +static void omap3_clk_lock_dpll5(void) +{ + struct clk *dpll5_clk; + struct clk *dpll5_m2_clk; + + dpll5_clk = clk_get(NULL, "dpll5_ck"); + clk_set_rate(dpll5_clk, DPLL5_FREQ_FOR_USBHOST); + clk_enable(dpll5_clk); + + /* Enable autoidle to allow it to enter low power bypass */ + omap3_dpll_allow_idle(dpll5_clk); + + /* Program dpll5_m2_clk divider for no division */ + dpll5_m2_clk = clk_get(NULL, "dpll5_m2_ck"); + clk_enable(dpll5_m2_clk); + clk_set_rate(dpll5_m2_clk, DPLL5_FREQ_FOR_USBHOST); + + clk_disable(dpll5_m2_clk); + clk_disable(dpll5_clk); + return; +} + /* REVISIT: Move this init stuff out into clock.c */ /* @@ -1148,6 +1177,12 @@ int __init omap2_clk_init(void) */ clk_enable_init_clocks(); + /* + * Lock DPLL5 and put it in autoidle. + */ + if (omap_rev() >= OMAP3430_REV_ES2_0) + omap3_clk_lock_dpll5(); + /* Avoid sleeping during omap2_clk_prepare_for_reboot() */ /* REVISIT: not yet ready for 343x */ #if 0 |