/** * keystone_timer_config: configures timer to work in oneshot/periodic modes. * @ mask: mask of the mode to configure * @ period: cycles number to configure for */ static int keystone_timer_config(u64 period, int mask) { u32 tcr; u32 off; tcr = keystone_timer_readl(TCR); off = tcr & ~(TCR_ENAMODE_MASK); /* set enable mode */ tcr |= mask; /* disable timer */ keystone_timer_writel(off, TCR); /* here we have to be sure the timer has been disabled */ keystone_timer_barrier(); /* reset counter to zero, set new period */ keystone_timer_writel(0, TIM12); keystone_timer_writel(0, TIM34); keystone_timer_writel(period & 0xffffffff, PRD12); keystone_timer_writel(period >> 32, PRD34); /* * enable timer * here we have to be sure that CNTLO, CNTHI, PRDLO, PRDHI registers * have been written. */ keystone_timer_barrier(); keystone_timer_writel(tcr, TCR); return 0; }
static void keystone_timer_disable(void) { u32 tcr; tcr = keystone_timer_readl(TCR); /* disable timer */ tcr &= ~(TCR_ENAMODE_MASK); keystone_timer_writel(tcr, TCR); }
/** * keystone_timer_config: configures timer to work in oneshot/periodic modes. * @ mode: mode to configure * @ period: cycles number to configure for */ static int keystone_timer_config(u64 period, enum clock_event_mode mode) { u32 tcr; u32 off; tcr = keystone_timer_readl(TCR); off = tcr & ~(TCR_ENAMODE_MASK); /* set enable mode */ switch (mode) { case CLOCK_EVT_MODE_ONESHOT: tcr |= TCR_ENAMODE_ONESHOT_MASK; break; case CLOCK_EVT_MODE_PERIODIC: tcr |= TCR_ENAMODE_PERIODIC_MASK; break; default: return -1; } /* disable timer */ keystone_timer_writel(off, TCR); /* here we have to be sure the timer has been disabled */ keystone_timer_barrier(); /* reset counter to zero, set new period */ keystone_timer_writel(0, TIM12); keystone_timer_writel(0, TIM34); keystone_timer_writel(period & 0xffffffff, PRD12); keystone_timer_writel(period >> 32, PRD34); /* * enable timer * here we have to be sure that CNTLO, CNTHI, PRDLO, PRDHI registers * have been written. */ keystone_timer_barrier(); keystone_timer_writel(tcr, TCR); return 0; }