todm5819p_rmc.c revision 8fc99e42676a23421c75e76660640f9765d693b1
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2010 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* tod driver module for ALI M5819P part
*/
#include <sys/types.h>
#include <sys/conf.h>
#include <sys/kmem.h>
#include <sys/open.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/todm5819p.h>
#include <sys/rmc_comm_dp.h>
#include <sys/rmc_comm_drvintf.h>
#include <sys/modctl.h>
#include <sys/stat.h>
#include <sys/clock.h>
#include <sys/reboot.h>
#include <sys/machsystm.h>
static timestruc_t todm5819p_rmc_get(void);
static void todm5819p_rmc_set(timestruc_t);
static uint_t todm5819p_rmc_set_watchdog_timer(uint_t);
static uint_t todm5819p_rmc_clear_watchdog_timer(void);
static void todm5819p_rmc_set_power_alarm(timestruc_t);
static void todm5819p_rmc_clear_power_alarm(void);
static uint64_t todm5819p_rmc_get_cpufrequency(void);
extern uint64_t find_cpufrequency(volatile uint8_t *);
/*
* External variables
*/
extern int watchdog_enable;
extern int watchdog_available;
extern int boothowto;
/*
* Global variables
*/
int m5819p_debug_flags;
/*
* Module linkage information for the kernel.
*/
static struct modlmisc modlmisc = {
&mod_miscops, "tod module for ALI M5819P"
};
static struct modlinkage modlinkage = {
MODREV_1, (void *)&modlmisc, NULL
};
static todinfo_t rtc_to_tod(struct rtc_t *);
static void read_rtc(struct rtc_t *);
static void write_rtc_time(struct rtc_t *);
static void write_rtc_alarm(struct rtc_t *);
int
_init(void)
{
if (strcmp(tod_module_name, "todm5819p_rmc") == 0) {
M5819P_ADDR_REG = RTC_B;
M5819P_DATA_REG = (RTC_DM | RTC_HM);
tod_ops.tod_get = todm5819p_rmc_get;
tod_ops.tod_set = todm5819p_rmc_set;
tod_ops.tod_set_watchdog_timer =
todm5819p_rmc_set_watchdog_timer;
tod_ops.tod_clear_watchdog_timer =
todm5819p_rmc_clear_watchdog_timer;
tod_ops.tod_set_power_alarm = todm5819p_rmc_set_power_alarm;
tod_ops.tod_clear_power_alarm = todm5819p_rmc_clear_power_alarm;
tod_ops.tod_get_cpufrequency = todm5819p_rmc_get_cpufrequency;
if (boothowto & RB_DEBUG) {
cmn_err(CE_WARN, "todm5819p_rmc: kernel debugger "
"detected: hardware watchdog disabled");
}
}
return (mod_install(&modlinkage));
}
int
_fini(void)
{
if (strcmp(tod_module_name, "todm5819p_rmc") == 0)
return (EBUSY);
return (mod_remove(&modlinkage));
}
/*
* The loadable-module _info(9E) entry point
*/
int
_info(struct modinfo *modinfop)
{
return (mod_info(&modlinkage, modinfop));
}
/*
* Read the current time from the clock chip and convert to UNIX form.
* Assumes that the year in the clock chip is valid.
* Must be called with tod_lock held.
*/
static timestruc_t
todm5819p_rmc_get(void)
{
int i;
int s;
timestruc_t ts;
struct rtc_t rtc;
ASSERT(MUTEX_HELD(&tod_lock));
/* set the hw watchdog timer if it's been activated */
if (watchdog_activated) {
int ret = 0;
ret = tod_ops.tod_set_watchdog_timer(0);
/*
* The empty set_watchdog routine returns a 0. So if a
* coded routine fails we will look for a -1 for a failure.
*/
if (ret == -1)
cmn_err(CE_WARN, "todm5819p: failed to set hardware "
"watchdog timer.");
}
/*
* Read current time from the tod. If the tod isn't accessible, wait and
* retry.
* Run critical in the time critical section to avoid being interrupted
*/
for (i = 0; i < TODM5819_UIP_RETRY_THRESH; i++) {
s = ddi_enter_critical();
M5819P_ADDR_REG = RTC_A;
if (!(M5819P_DATA_REG & RTC_UIP)) {
read_rtc(&rtc);
ddi_exit_critical(s);
break;
}
ddi_exit_critical(s);
drv_usecwait(TODM5819_UIP_WAIT_USEC);
}
if (i == TODM5819_UIP_RETRY_THRESH) {
/*
* tod is inaccessible: just return current software time
*/
tod_status_set(TOD_GET_FAILED);
return (hrestime);
}
/* read was successful so ensure failure flag is clear */
tod_status_clear(TOD_GET_FAILED);
ts.tv_sec = tod_to_utc(rtc_to_tod(&rtc));
ts.tv_nsec = 0;
return (ts);
}
static todinfo_t
rtc_to_tod(struct rtc_t *rtc)
{
todinfo_t tod;
/*
* tod_year is base 1900 so this code needs to adjust the true year
* retrieved from the rtc's century and year fields.
*/
tod.tod_year = rtc->rtc_year + (rtc->rtc_century * 100) - 1900;
tod.tod_month = rtc->rtc_mon;
tod.tod_day = rtc->rtc_dom;
tod.tod_dow = rtc->rtc_dow;
tod.tod_hour = rtc->rtc_hrs;
tod.tod_min = rtc->rtc_min;
tod.tod_sec = rtc->rtc_sec;
return (tod);
}
static void
read_rtc(struct rtc_t *rtc)
{
M5819P_ADDR_REG = RTC_SEC;
rtc->rtc_sec = M5819P_DATA_REG;
M5819P_ADDR_REG = RTC_ASEC;
rtc->rtc_asec = M5819P_DATA_REG;
M5819P_ADDR_REG = RTC_MIN;
rtc->rtc_min = M5819P_DATA_REG;
M5819P_ADDR_REG = RTC_AMIN;
rtc->rtc_amin = M5819P_DATA_REG;
M5819P_ADDR_REG = RTC_HRS;
rtc->rtc_hrs = M5819P_DATA_REG;
M5819P_ADDR_REG = RTC_AHRS;
rtc->rtc_ahrs = M5819P_DATA_REG;
M5819P_ADDR_REG = RTC_DOW;
rtc->rtc_dow = M5819P_DATA_REG;
M5819P_ADDR_REG = RTC_DOM;
rtc->rtc_dom = M5819P_DATA_REG;
M5819P_ADDR_REG = RTC_MON;
rtc->rtc_mon = M5819P_DATA_REG;
M5819P_ADDR_REG = RTC_YEAR;
rtc->rtc_year = M5819P_DATA_REG;
M5819P_ADDR_REG = RTC_CENTURY;
rtc->rtc_century = M5819P_DATA_REG;
/* Read date alarm */
M5819P_ADDR_REG = RTC_ADOM_REG;
rtc->rtc_adom = (M5819P_DATA_REG) & RTC_ADOM;
}
/*
* Write the specified time into the clock chip.
* Must be called with tod_lock held.
*/
static void
todm5819p_rmc_set(timestruc_t ts)
{
struct rtc_t rtc;
todinfo_t tod = utc_to_tod(ts.tv_sec);
int year;
rmc_comm_msg_t request;
dp_set_date_time_t set_time_msg;
ASSERT(MUTEX_HELD(&tod_lock));
/* tod_year is base 1900 so this code needs to adjust */
year = 1900 + tod.tod_year;
rtc.rtc_year = year % 100;
rtc.rtc_century = year / 100;
rtc.rtc_mon = (uint8_t)tod.tod_month;
rtc.rtc_dom = (uint8_t)tod.tod_day;
rtc.rtc_dow = (uint8_t)tod.tod_dow;
rtc.rtc_hrs = (uint8_t)tod.tod_hour;
rtc.rtc_min = (uint8_t)tod.tod_min;
rtc.rtc_sec = (uint8_t)tod.tod_sec;
write_rtc_time(&rtc);
set_time_msg.year = year - 1900;
set_time_msg.month = tod.tod_month - 1;
set_time_msg.day = tod.tod_day;
set_time_msg.hour = tod.tod_hour;
set_time_msg.minute = tod.tod_min;
set_time_msg.second = tod.tod_sec;
request.msg_type = DP_SET_DATE_TIME;
request.msg_len = sizeof (set_time_msg);
request.msg_buf = (caddr_t)&set_time_msg;
(void) rmc_comm_request_nowait(&request, 0);
}
void
write_rtc_time(struct rtc_t *rtc)
{
uint8_t regb;
int i;
/*
* Freeze
*/
M5819P_ADDR_REG = RTC_B;
regb = M5819P_DATA_REG;
M5819P_DATA_REG = (regb | RTC_SET);
/*
* If an update cycle is in progress wait for the UIP flag to
* clear. If we write whilst UIP is still set there is a slight
* but real possibility of corrupting the RTC date and time
* registers.
*
* The expected wait is one internal cycle of the chip. We could
* simply spin but this may hang a CPU if we were to have a broken
* RTC chip where UIP is stuck, so we use a retry loop instead.
* No critical section is needed here as the UIP flag will not be
* re-asserted until we clear RTC_SET.
*/
M5819P_ADDR_REG = RTC_A;
for (i = 0; i < TODM5819_UIP_RETRY_THRESH; i++) {
if (!(M5819P_DATA_REG & RTC_UIP)) {
break;
}
drv_usecwait(TODM5819_UIP_WAIT_USEC);
}
if (i < TODM5819_UIP_RETRY_THRESH) {
M5819P_ADDR_REG = RTC_SEC;
M5819P_DATA_REG = rtc->rtc_sec;
M5819P_ADDR_REG = RTC_MIN;
M5819P_DATA_REG = rtc->rtc_min;
M5819P_ADDR_REG = RTC_HRS;
M5819P_DATA_REG = rtc->rtc_hrs;
M5819P_ADDR_REG = RTC_DOW;
M5819P_DATA_REG = rtc->rtc_dow;
M5819P_ADDR_REG = RTC_DOM;
M5819P_DATA_REG = rtc->rtc_dom;
M5819P_ADDR_REG = RTC_MON;
M5819P_DATA_REG = rtc->rtc_mon;
M5819P_ADDR_REG = RTC_YEAR;
M5819P_DATA_REG = rtc->rtc_year;
M5819P_ADDR_REG = RTC_CENTURY;
M5819P_DATA_REG = rtc->rtc_century;
} else {
cmn_err(CE_WARN, "todm5819p_rmc: Could not write the RTC\n");
}
/*
* Unfreeze
*/
M5819P_ADDR_REG = RTC_B;
M5819P_DATA_REG = regb;
}
void
write_rtc_alarm(struct rtc_t *rtc)
{
M5819P_ADDR_REG = RTC_ASEC;
M5819P_DATA_REG = rtc->rtc_asec;
M5819P_ADDR_REG = RTC_AMIN;
M5819P_DATA_REG = rtc->rtc_amin;
M5819P_ADDR_REG = RTC_AHRS;
M5819P_DATA_REG = rtc->rtc_ahrs;
M5819P_ADDR_REG = RTC_ADOM_REG;
M5819P_DATA_REG = rtc->rtc_adom;
}
/*
* program the rtc registers for alarm to go off at the specified time
*/
static void
todm5819p_rmc_set_power_alarm(timestruc_t ts)
{
todinfo_t tod;
uint8_t regb;
struct rtc_t rtc;
ASSERT(MUTEX_HELD(&tod_lock));
tod = utc_to_tod(ts.tv_sec);
/*
* disable alarms and clear AF flag by reading reg C
*/
M5819P_ADDR_REG = RTC_B;
regb = M5819P_DATA_REG;
M5819P_DATA_REG = regb & ~RTC_AIE;
M5819P_ADDR_REG = RTC_C;
(void) M5819P_DATA_REG;
rtc.rtc_asec = (uint8_t)tod.tod_sec;
rtc.rtc_amin = (uint8_t)tod.tod_min;
rtc.rtc_ahrs = (uint8_t)tod.tod_hour;
rtc.rtc_adom = (uint8_t)tod.tod_day;
/*
* Write alarm values and enable alarm
*/
write_rtc_alarm(&rtc);
M5819P_ADDR_REG = RTC_B;
M5819P_DATA_REG = regb | RTC_AIE;
}
/*
* clear alarm interrupt
*/
static void
todm5819p_rmc_clear_power_alarm(void)
{
uint8_t regb;
ASSERT(MUTEX_HELD(&tod_lock));
M5819P_ADDR_REG = RTC_B;
regb = M5819P_DATA_REG;
M5819P_DATA_REG = regb & ~RTC_AIE;
}
/*
* Determine the cpu frequency by watching the TOD chip rollover twice.
* Cpu clock rate is determined by computing the ticks added (in tick register)
* during one second interval on TOD.
*/
uint64_t
todm5819p_rmc_get_cpufrequency(void)
{
ASSERT(MUTEX_HELD(&tod_lock));
M5819P_ADDR_REG = RTC_SEC;
return (find_cpufrequency(v_rtc_data_reg));
}
/*ARGSUSED*/
static uint_t
todm5819p_rmc_set_watchdog_timer(uint_t timeoutval)
{
ASSERT(MUTEX_HELD(&tod_lock));
return (0);
}
static uint_t
todm5819p_rmc_clear_watchdog_timer(void)
{
ASSERT(MUTEX_HELD(&tod_lock));
return (0);
}