void __init gemini_timer_init(void) { unsigned int tick_rate, reg_v; reg_v = __raw_readl(IO_ADDRESS(GEMINI_GLOBAL_BASE + GLOBAL_STATUS)); tick_rate = REG_TO_AHB_SPEED(reg_v) * 1000000; printk(KERN_INFO "Bus: %dMHz", tick_rate / 1000000); tick_rate /= 6; /* APB bus run AHB*(1/6) */ switch(reg_v & CPU_AHB_RATIO_MASK) { case CPU_AHB_1_1: printk(KERN_CONT "(1/1)\n"); break; case CPU_AHB_3_2: printk(KERN_CONT "(3/2)\n"); break; case CPU_AHB_24_13: printk(KERN_CONT "(24/13)\n"); break; case CPU_AHB_2_1: printk(KERN_CONT "(2/1)\n"); break; } /* * Make irqs happen for the system timer */ setup_irq(IRQ_TIMER2, &gemini_timer_irq); /* Start the timer */ __raw_writel(tick_rate / HZ, TIMER_COUNT(IO_ADDRESS(GEMINI_TIMER2_BASE))); __raw_writel(tick_rate / HZ, TIMER_LOAD(IO_ADDRESS(GEMINI_TIMER2_BASE))); __raw_writel(TIMER_2_CR_ENABLE | TIMER_2_CR_INT, TIMER_CR(IO_ADDRESS(GEMINI_TIMER_BASE))); }
/*===========================================================================* * init_8235A_timer * *===========================================================================*/ PUBLIC int init_8253A_timer(const unsigned freq) { /* Initialize channel 0 of the 8253A timer to, e.g., 60 Hz, * and register the CLOCK task's interrupt handler to be run * on every clock tick. */ outb(TIMER_MODE, SQUARE_WAVE); /* run continuously */ outb(TIMER0, (TIMER_COUNT(freq) & 0xff)); /* timer low byte */ outb(TIMER0, TIMER_COUNT(freq) >> 8); /* timer high byte */ return OK; }