mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 18:46:39 +07:00
39e3eb7265
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Paul Mackerras <paulus@samba.org>
149 lines
3.3 KiB
C
149 lines
3.3 KiB
C
/*
|
|
* m8xx_wdt.c - MPC8xx watchdog driver
|
|
*
|
|
* Author: Florian Schirmer <jolt@tuxbox.org>
|
|
*
|
|
* 2002 (c) Florian Schirmer <jolt@tuxbox.org> This file is licensed under
|
|
* the terms of the GNU General Public License version 2. This program
|
|
* is licensed "as is" without any warranty of any kind, whether express
|
|
* or implied.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <asm/io.h>
|
|
#include <asm/8xx_immap.h>
|
|
#include <syslib/m8xx_wdt.h>
|
|
|
|
static int wdt_timeout;
|
|
int m8xx_has_internal_rtc = 0;
|
|
|
|
static irqreturn_t m8xx_wdt_interrupt(int, void *);
|
|
static struct irqaction m8xx_wdt_irqaction = {
|
|
.handler = m8xx_wdt_interrupt,
|
|
.name = "watchdog",
|
|
};
|
|
|
|
void m8xx_wdt_reset(void)
|
|
{
|
|
volatile immap_t *imap = (volatile immap_t *)IMAP_ADDR;
|
|
|
|
out_be16(&imap->im_siu_conf.sc_swsr, 0x556c); /* write magic1 */
|
|
out_be16(&imap->im_siu_conf.sc_swsr, 0xaa39); /* write magic2 */
|
|
}
|
|
|
|
static irqreturn_t m8xx_wdt_interrupt(int irq, void *dev)
|
|
{
|
|
volatile immap_t *imap = (volatile immap_t *)IMAP_ADDR;
|
|
|
|
m8xx_wdt_reset();
|
|
|
|
setbits16(&imap->im_sit.sit_piscr, PISCR_PS);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
#define SYPCR_SWP 0x1
|
|
#define SYPCR_SWE 0x4
|
|
|
|
|
|
void __init m8xx_wdt_install_irq(volatile immap_t *imap, bd_t *binfo)
|
|
{
|
|
u32 pitc;
|
|
u32 pitrtclk;
|
|
|
|
/*
|
|
* Fire trigger if half of the wdt ticked down
|
|
*/
|
|
|
|
if (imap->im_sit.sit_rtcsc & RTCSC_38K)
|
|
pitrtclk = 9600;
|
|
else
|
|
pitrtclk = 8192;
|
|
|
|
if ((wdt_timeout) > (UINT_MAX / pitrtclk))
|
|
pitc = wdt_timeout / binfo->bi_intfreq * pitrtclk / 2;
|
|
else
|
|
pitc = pitrtclk * wdt_timeout / binfo->bi_intfreq / 2;
|
|
|
|
out_be32(&imap->im_sit.sit_pitc, pitc << 16);
|
|
|
|
out_be16(&imap->im_sit.sit_piscr, (mk_int_int_mask(PIT_INTERRUPT) << 8) | PISCR_PIE | PISCR_PTE);
|
|
|
|
if (setup_irq(PIT_INTERRUPT, &m8xx_wdt_irqaction))
|
|
panic("m8xx_wdt: error setting up the watchdog irq!");
|
|
|
|
printk(KERN_NOTICE
|
|
"m8xx_wdt: keep-alive trigger installed (PITC: 0x%04X)\n", pitc);
|
|
|
|
}
|
|
|
|
static void m8xx_wdt_timer_func(unsigned long data);
|
|
|
|
static struct timer_list m8xx_wdt_timer =
|
|
TIMER_INITIALIZER(m8xx_wdt_timer_func, 0, 0);
|
|
|
|
void m8xx_wdt_stop_timer(void)
|
|
{
|
|
del_timer(&m8xx_wdt_timer);
|
|
}
|
|
|
|
void m8xx_wdt_install_timer(void)
|
|
{
|
|
m8xx_wdt_timer.expires = jiffies + (HZ/2);
|
|
add_timer(&m8xx_wdt_timer);
|
|
}
|
|
|
|
static void m8xx_wdt_timer_func(unsigned long data)
|
|
{
|
|
m8xx_wdt_reset();
|
|
m8xx_wdt_install_timer();
|
|
}
|
|
|
|
void __init m8xx_wdt_handler_install(bd_t * binfo)
|
|
{
|
|
volatile immap_t *imap = (volatile immap_t *)IMAP_ADDR;
|
|
u32 sypcr;
|
|
|
|
sypcr = in_be32(&imap->im_siu_conf.sc_sypcr);
|
|
|
|
if (!(sypcr & SYPCR_SWE)) {
|
|
printk(KERN_NOTICE "m8xx_wdt: wdt disabled (SYPCR: 0x%08X)\n",
|
|
sypcr);
|
|
return;
|
|
}
|
|
|
|
m8xx_wdt_reset();
|
|
|
|
printk(KERN_NOTICE
|
|
"m8xx_wdt: active wdt found (SWTC: 0x%04X, SWP: 0x%01X)\n",
|
|
(sypcr >> 16), sypcr & SYPCR_SWP);
|
|
|
|
wdt_timeout = (sypcr >> 16) & 0xFFFF;
|
|
|
|
if (!wdt_timeout)
|
|
wdt_timeout = 0xFFFF;
|
|
|
|
if (sypcr & SYPCR_SWP)
|
|
wdt_timeout *= 2048;
|
|
|
|
m8xx_has_internal_rtc = in_be16(&imap->im_sit.sit_rtcsc) & RTCSC_RTE;
|
|
|
|
/* if the internal RTC is off use a kernel timer */
|
|
if (!m8xx_has_internal_rtc) {
|
|
if (wdt_timeout < (binfo->bi_intfreq/HZ))
|
|
printk(KERN_ERR "m8xx_wdt: timeout too short for ktimer!\n");
|
|
m8xx_wdt_install_timer();
|
|
} else
|
|
m8xx_wdt_install_irq(imap, binfo);
|
|
|
|
wdt_timeout /= binfo->bi_intfreq;
|
|
}
|
|
|
|
int m8xx_wdt_get_timeout(void)
|
|
{
|
|
return wdt_timeout;
|
|
}
|