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135 lines
3.3 KiB
135 lines
3.3 KiB
/***************************************************************************/ |
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/* |
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* timers.c - Generic hardware timer support. |
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* |
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* Copyright (C) 1993 Hamish Macdonald |
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* Copyright (C) 1999 D. Jeff Dionne |
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* Copyright (C) 2001 Georges Menie, Ken Desmet |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file COPYING in the main directory of this archive |
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* for more details. |
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*/ |
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/***************************************************************************/ |
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#include <linux/types.h> |
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#include <linux/kernel.h> |
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#include <linux/mm.h> |
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#include <linux/interrupt.h> |
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#include <linux/irq.h> |
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#include <linux/clocksource.h> |
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#include <linux/rtc.h> |
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#include <asm/setup.h> |
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#include <asm/machdep.h> |
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#include <asm/MC68VZ328.h> |
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/***************************************************************************/ |
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#if defined(CONFIG_DRAGEN2) |
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/* with a 33.16 MHz clock, this will give usec resolution to the time functions */ |
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#define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK |
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#define CLOCK_PRE 7 |
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#define TICKS_PER_JIFFY 41450 |
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#elif defined(CONFIG_XCOPILOT_BUGS) |
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/* |
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* The only thing I know is that CLK32 is not available on Xcopilot |
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* I have little idea about what frequency SYSCLK has on Xcopilot. |
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* The values for prescaler and compare registers were simply |
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* taken from the original source |
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*/ |
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#define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK |
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#define CLOCK_PRE 2 |
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#define TICKS_PER_JIFFY 0xd7e4 |
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#else |
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/* default to using the 32Khz clock */ |
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#define CLOCK_SOURCE TCTL_CLKSOURCE_32KHZ |
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#define CLOCK_PRE 31 |
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#define TICKS_PER_JIFFY 10 |
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#endif |
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static u32 m68328_tick_cnt; |
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/***************************************************************************/ |
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static irqreturn_t hw_tick(int irq, void *dummy) |
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{ |
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/* Reset Timer1 */ |
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TSTAT &= 0; |
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m68328_tick_cnt += TICKS_PER_JIFFY; |
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legacy_timer_tick(1); |
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return IRQ_HANDLED; |
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} |
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/***************************************************************************/ |
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static u64 m68328_read_clk(struct clocksource *cs) |
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{ |
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unsigned long flags; |
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u32 cycles; |
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local_irq_save(flags); |
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cycles = m68328_tick_cnt + TCN; |
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local_irq_restore(flags); |
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return cycles; |
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} |
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/***************************************************************************/ |
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static struct clocksource m68328_clk = { |
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.name = "timer", |
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.rating = 250, |
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.read = m68328_read_clk, |
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.mask = CLOCKSOURCE_MASK(32), |
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.flags = CLOCK_SOURCE_IS_CONTINUOUS, |
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}; |
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/***************************************************************************/ |
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void hw_timer_init(void) |
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{ |
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int ret; |
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/* disable timer 1 */ |
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TCTL = 0; |
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/* set ISR */ |
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ret = request_irq(TMR_IRQ_NUM, hw_tick, IRQF_TIMER, "timer", NULL); |
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if (ret) { |
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pr_err("Failed to request irq %d (timer): %pe\n", TMR_IRQ_NUM, |
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ERR_PTR(ret)); |
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} |
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/* Restart mode, Enable int, Set clock source */ |
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TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE; |
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TPRER = CLOCK_PRE; |
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TCMP = TICKS_PER_JIFFY; |
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/* Enable timer 1 */ |
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TCTL |= TCTL_TEN; |
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clocksource_register_hz(&m68328_clk, TICKS_PER_JIFFY*HZ); |
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} |
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/***************************************************************************/ |
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int m68328_hwclk(int set, struct rtc_time *t) |
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{ |
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if (!set) { |
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long now = RTCTIME; |
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t->tm_year = 1; |
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t->tm_mon = 0; |
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t->tm_mday = 1; |
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t->tm_hour = (now >> 24) % 24; |
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t->tm_min = (now >> 16) % 60; |
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t->tm_sec = now % 60; |
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} |
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return 0; |
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} |
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/***************************************************************************/
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