118cb3fafSGreg Ungerer /***************************************************************************/
218cb3fafSGreg Ungerer
318cb3fafSGreg Ungerer /*
418cb3fafSGreg Ungerer * timers.c - Generic hardware timer support.
518cb3fafSGreg Ungerer *
618cb3fafSGreg Ungerer * Copyright (C) 1993 Hamish Macdonald
718cb3fafSGreg Ungerer * Copyright (C) 1999 D. Jeff Dionne
818cb3fafSGreg Ungerer * Copyright (C) 2001 Georges Menie, Ken Desmet
918cb3fafSGreg Ungerer *
1018cb3fafSGreg Ungerer * This file is subject to the terms and conditions of the GNU General Public
1118cb3fafSGreg Ungerer * License. See the file COPYING in the main directory of this archive
1218cb3fafSGreg Ungerer * for more details.
1318cb3fafSGreg Ungerer */
1418cb3fafSGreg Ungerer
1518cb3fafSGreg Ungerer /***************************************************************************/
1618cb3fafSGreg Ungerer
1718cb3fafSGreg Ungerer #include <linux/types.h>
1818cb3fafSGreg Ungerer #include <linux/kernel.h>
1918cb3fafSGreg Ungerer #include <linux/mm.h>
2018cb3fafSGreg Ungerer #include <linux/interrupt.h>
2118cb3fafSGreg Ungerer #include <linux/irq.h>
2218cb3fafSGreg Ungerer #include <linux/clocksource.h>
2318cb3fafSGreg Ungerer #include <linux/rtc.h>
2418cb3fafSGreg Ungerer #include <asm/setup.h>
2518cb3fafSGreg Ungerer #include <asm/machdep.h>
2618cb3fafSGreg Ungerer #include <asm/MC68VZ328.h>
2718cb3fafSGreg Ungerer
2818cb3fafSGreg Ungerer /***************************************************************************/
2918cb3fafSGreg Ungerer
3018cb3fafSGreg Ungerer #if defined(CONFIG_DRAGEN2)
3118cb3fafSGreg Ungerer /* with a 33.16 MHz clock, this will give usec resolution to the time functions */
3218cb3fafSGreg Ungerer #define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK
3318cb3fafSGreg Ungerer #define CLOCK_PRE 7
3418cb3fafSGreg Ungerer #define TICKS_PER_JIFFY 41450
3518cb3fafSGreg Ungerer
3618cb3fafSGreg Ungerer #elif defined(CONFIG_XCOPILOT_BUGS)
3718cb3fafSGreg Ungerer /*
3818cb3fafSGreg Ungerer * The only thing I know is that CLK32 is not available on Xcopilot
3918cb3fafSGreg Ungerer * I have little idea about what frequency SYSCLK has on Xcopilot.
4018cb3fafSGreg Ungerer * The values for prescaler and compare registers were simply
4118cb3fafSGreg Ungerer * taken from the original source
4218cb3fafSGreg Ungerer */
4318cb3fafSGreg Ungerer #define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK
4418cb3fafSGreg Ungerer #define CLOCK_PRE 2
4518cb3fafSGreg Ungerer #define TICKS_PER_JIFFY 0xd7e4
4618cb3fafSGreg Ungerer
4718cb3fafSGreg Ungerer #else
4818cb3fafSGreg Ungerer /* default to using the 32Khz clock */
4918cb3fafSGreg Ungerer #define CLOCK_SOURCE TCTL_CLKSOURCE_32KHZ
5018cb3fafSGreg Ungerer #define CLOCK_PRE 31
5118cb3fafSGreg Ungerer #define TICKS_PER_JIFFY 10
5218cb3fafSGreg Ungerer #endif
5318cb3fafSGreg Ungerer
5418cb3fafSGreg Ungerer static u32 m68328_tick_cnt;
5518cb3fafSGreg Ungerer
5618cb3fafSGreg Ungerer /***************************************************************************/
5718cb3fafSGreg Ungerer
hw_tick(int irq,void * dummy)5818cb3fafSGreg Ungerer static irqreturn_t hw_tick(int irq, void *dummy)
5918cb3fafSGreg Ungerer {
6018cb3fafSGreg Ungerer /* Reset Timer1 */
6118cb3fafSGreg Ungerer TSTAT &= 0;
6218cb3fafSGreg Ungerer
6318cb3fafSGreg Ungerer m68328_tick_cnt += TICKS_PER_JIFFY;
6409323308SArnd Bergmann legacy_timer_tick(1);
6509323308SArnd Bergmann return IRQ_HANDLED;
6618cb3fafSGreg Ungerer }
6718cb3fafSGreg Ungerer
6818cb3fafSGreg Ungerer /***************************************************************************/
6918cb3fafSGreg Ungerer
m68328_read_clk(struct clocksource * cs)70a5a1d1c2SThomas Gleixner static u64 m68328_read_clk(struct clocksource *cs)
7118cb3fafSGreg Ungerer {
7218cb3fafSGreg Ungerer unsigned long flags;
7318cb3fafSGreg Ungerer u32 cycles;
7418cb3fafSGreg Ungerer
7518cb3fafSGreg Ungerer local_irq_save(flags);
7618cb3fafSGreg Ungerer cycles = m68328_tick_cnt + TCN;
7718cb3fafSGreg Ungerer local_irq_restore(flags);
7818cb3fafSGreg Ungerer
7918cb3fafSGreg Ungerer return cycles;
8018cb3fafSGreg Ungerer }
8118cb3fafSGreg Ungerer
8218cb3fafSGreg Ungerer /***************************************************************************/
8318cb3fafSGreg Ungerer
8418cb3fafSGreg Ungerer static struct clocksource m68328_clk = {
8518cb3fafSGreg Ungerer .name = "timer",
8618cb3fafSGreg Ungerer .rating = 250,
8718cb3fafSGreg Ungerer .read = m68328_read_clk,
8818cb3fafSGreg Ungerer .mask = CLOCKSOURCE_MASK(32),
8918cb3fafSGreg Ungerer .flags = CLOCK_SOURCE_IS_CONTINUOUS,
9018cb3fafSGreg Ungerer };
9118cb3fafSGreg Ungerer
9218cb3fafSGreg Ungerer /***************************************************************************/
9318cb3fafSGreg Ungerer
hw_timer_init(void)94*f9a01539SArnd Bergmann void hw_timer_init(void)
9518cb3fafSGreg Ungerer {
96ba000760Safzal mohammed int ret;
97ba000760Safzal mohammed
9818cb3fafSGreg Ungerer /* disable timer 1 */
9918cb3fafSGreg Ungerer TCTL = 0;
10018cb3fafSGreg Ungerer
10118cb3fafSGreg Ungerer /* set ISR */
102ba000760Safzal mohammed ret = request_irq(TMR_IRQ_NUM, hw_tick, IRQF_TIMER, "timer", NULL);
103ba000760Safzal mohammed if (ret) {
104ba000760Safzal mohammed pr_err("Failed to request irq %d (timer): %pe\n", TMR_IRQ_NUM,
105ba000760Safzal mohammed ERR_PTR(ret));
106ba000760Safzal mohammed }
10718cb3fafSGreg Ungerer
10818cb3fafSGreg Ungerer /* Restart mode, Enable int, Set clock source */
10918cb3fafSGreg Ungerer TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE;
11018cb3fafSGreg Ungerer TPRER = CLOCK_PRE;
11118cb3fafSGreg Ungerer TCMP = TICKS_PER_JIFFY;
11218cb3fafSGreg Ungerer
11318cb3fafSGreg Ungerer /* Enable timer 1 */
11418cb3fafSGreg Ungerer TCTL |= TCTL_TEN;
11518cb3fafSGreg Ungerer clocksource_register_hz(&m68328_clk, TICKS_PER_JIFFY*HZ);
11618cb3fafSGreg Ungerer }
11718cb3fafSGreg Ungerer
11818cb3fafSGreg Ungerer /***************************************************************************/
11918cb3fafSGreg Ungerer
m68328_hwclk(int set,struct rtc_time * t)12018cb3fafSGreg Ungerer int m68328_hwclk(int set, struct rtc_time *t)
12118cb3fafSGreg Ungerer {
12218cb3fafSGreg Ungerer if (!set) {
12318cb3fafSGreg Ungerer long now = RTCTIME;
124b65769fcSFinn Thain t->tm_year = 1;
125b65769fcSFinn Thain t->tm_mon = 0;
126b65769fcSFinn Thain t->tm_mday = 1;
12718cb3fafSGreg Ungerer t->tm_hour = (now >> 24) % 24;
12818cb3fafSGreg Ungerer t->tm_min = (now >> 16) % 60;
12918cb3fafSGreg Ungerer t->tm_sec = now % 60;
13018cb3fafSGreg Ungerer }
13118cb3fafSGreg Ungerer
13218cb3fafSGreg Ungerer return 0;
13318cb3fafSGreg Ungerer }
13418cb3fafSGreg Ungerer
13518cb3fafSGreg Ungerer /***************************************************************************/
136