/***********************license start***************
* Copyright (c) 2003-2010 Cavium Inc. (support@cavium.com). All rights
* reserved.
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*
* * Redistributions of source code must retain the above copyright
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*
* * Redistributions in binary form must reproduce the above
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* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of Cavium Inc. nor the names of
* its contributors may be used to endorse or promote products
* derived from this software without specific prior written
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* This Software, including technical data, may be subject to U.S. export control
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* TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
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***********************license end**************************************/
/**
* @file
*
* Interface to the Thunder specific devices
*
* <hr>$Revision: 70030 $<hr>
*
*/
#include "cvmx.h"
#include "cvmx-sysinfo.h"
#include "cvmx-thunder.h"
#include "cvmx-gpio.h"
#include "cvmx-twsi.h"
static const int BYPASS_STATUS = 1<<5; /* GPIO 5 */
static const int BYPASS_EN = 1<<6; /* GPIO 6 */
static const int WDT_BP_CLR = 1<<7; /* GPIO 7 */
static const int RTC_CTL_ADDR = 0x7;
static const int RTC_CTL_BIT_EOSC = 0x80;
static const int RTC_CTL_BIT_WACE = 0x40;
static const int RTC_CTL_BIT_WD_ALM = 0x20;
static const int RTC_CTL_BIT_WDSTR = 0x8;
static const int RTC_CTL_BIT_AIE = 0x1;
static const int RTC_WD_ALM_CNT_BYTE0_ADDR = 0x4;
#define CVMX_LAN_BYPASS_MSG(...) do {} while(0)
/*
* Board-specifc RTC read
* Time is expressed in seconds from epoch (Jan 1 1970 at 00:00:00 UTC)
*/
uint32_t cvmx_rtc_ds1374_read(void)
{
int retry;
uint8_t sec;
uint32_t time;
for(retry=0; retry<2; retry++)
{
time = cvmx_twsi_read8(CVMX_RTC_DS1374_ADDR, 0x0);
time |= (cvmx_twsi_read8_cur_addr(CVMX_RTC_DS1374_ADDR) & 0xff) << 8;
time |= (cvmx_twsi_read8_cur_addr(CVMX_RTC_DS1374_ADDR) & 0xff) << 16;
time |= (cvmx_twsi_read8_cur_addr(CVMX_RTC_DS1374_ADDR) & 0xff) << 24;
sec = cvmx_twsi_read8(CVMX_RTC_DS1374_ADDR, 0x0);
if (sec == (time & 0xff))
break; /* Time did not roll-over, value is correct */
}
return time;
}
/*
* Board-specific RTC write
* Time is expressed in seconds from epoch (Jan 1 1970 at 00:00:00 UTC)
*/
int cvmx_rtc_ds1374_write(uint32_t time)
{
int rc;
int retry;
uint8_t sec;
for(retry=0; retry<2; retry++)
{
rc = cvmx_twsi_write8(CVMX_RTC_DS1374_ADDR, 0x0, time & 0xff);
rc |= cvmx_twsi_write8(CVMX_RTC_DS1374_ADDR, 0x1, (time >> 8) & 0xff);
rc |= cvmx_twsi_write8(CVMX_RTC_DS1374_ADDR, 0x2, (time >> 16) & 0xff);
rc |= cvmx_twsi_write8(CVMX_RTC_DS1374_ADDR, 0x3, (time >> 24) & 0xff);
sec = cvmx_twsi_read8(CVMX_RTC_DS1374_ADDR, 0x0);
if (sec == (time & 0xff))
break; /* Time did not roll-over, value is correct */
}
return (rc ? -1 : 0);
}
static int cvmx_rtc_ds1374_alarm_config(int WD, int WDSTR, int AIE)
{
int val;
val = cvmx_twsi_read8(CVMX_RTC_DS1374_ADDR,RTC_CTL_ADDR);
val = val & ~RTC_CTL_BIT_EOSC; /* Make sure that oscillator is running */
WD?(val = val | RTC_CTL_BIT_WD_ALM):(val = val & ~RTC_CTL_BIT_WD_ALM);
WDSTR?(val = val | RTC_CTL_BIT_WDSTR):(val = val & ~RTC_CTL_BIT_WDSTR);
AIE?(val = val | RTC_CTL_BIT_AIE):(val = val & ~RTC_CTL_BIT_AIE);
cvmx_twsi_write8(CVMX_RTC_DS1374_ADDR,RTC_CTL_ADDR, val);
return 0;
}
static int cvmx_rtc_ds1374_alarm_set(int alarm_on)
{
uint8_t val;
if (alarm_on)
{
val = cvmx_twsi_read8(CVMX_RTC_DS1374_ADDR,RTC_CTL_ADDR);
cvmx_twsi_write8(CVMX_RTC_DS1374_ADDR,RTC_CTL_ADDR, val | RTC_CTL_BIT_WACE);
}
else
{
val = cvmx_twsi_read8(CVMX_RTC_DS1374_ADDR,RTC_CTL_ADDR);
cvmx_twsi_write8(CVMX_RTC_DS1374_ADDR,RTC_CTL_ADDR, val & ~RTC_CTL_BIT_WACE);
}
return 0;
}
static int cvmx_rtc_ds1374_alarm_counter_set(uint32_t interval)
{
int i;
int rc = 0;
for(i=0;i<3;i++)
{
rc |= cvmx_twsi_write8(CVMX_RTC_DS1374_ADDR, RTC_WD_ALM_CNT_BYTE0_ADDR+i, interval & 0xFF);
interval >>= 8;
}
return rc;
}
#if 0 /* XXX unused */
static uint32_t cvmx_rtc_ds1374_alarm_counter_get(void)
{
int i;
uint32_t interval = 0;
for(i=0;i<3;i++)
{
interval |= ( cvmx_twsi_read8(CVMX_RTC_DS1374_ADDR,RTC_WD_ALM_CNT_BYTE0_ADDR+i) & 0xff) << (i*8);
}
return interval;
}
#endif
#ifdef CVMX_RTC_DEBUG
void cvmx_rtc_ds1374_dump_state(void)
{
int i = 0;
cvmx_dprintf("RTC:\n");
cvmx_dprintf("%d : %02X ", i, cvmx_twsi_read8(CVMX_RTC_DS1374_ADDR, 0x0));
for(i=1; i<10; i++)
{
cvmx_dprintf("%02X ", cvmx_twsi_read8_cur_addr(CVMX_RTC_DS1374_ADDR));
}
cvmx_dprintf("\n");
}
#endif /* CVMX_RTC_DEBUG */
/*
* LAN bypass functionality
*/
/* Private initialization function */
static int cvmx_lan_bypass_init(void)
{
const int CLR_PULSE = 100; /* Longer than 100 ns (on CPUs up to 1 GHz) */
//Clear GPIO 6
cvmx_gpio_clear(BYPASS_EN);
//Disable WDT
cvmx_rtc_ds1374_alarm_set(0);
//GPIO(7) Send a low pulse
cvmx_gpio_clear(WDT_BP_CLR);
cvmx_wait(CLR_PULSE);
cvmx_gpio_set(WDT_BP_CLR);
return 0;
}
/**
* Set LAN bypass mode.
*
* Supported modes are:
* - CVMX_LAN_BYPASS_OFF
* <br>LAN ports are connected ( port 0 <--> Octeon <--> port 1 )
*
* - CVMX_LAN_BYPASS_GPIO
* <br>LAN bypass is controlled by software using cvmx_lan_bypass_force() function.
* When transitioning to this mode, default is LAN bypass enabled
* ( port 0 <--> port 1, -- Octeon ).
*
* - CVMX_LAN_BYPASS_WATCHDOG
* <br>LAN bypass is inactive as long as a watchdog is kept alive.
* The default expiration time is 1 second and the function to
* call periodically to prevent watchdog expiration is
* cvmx_lan_bypass_keep_alive().
*
* @param mode LAN bypass mode
*
* @return Error code, or 0 in case of success
*/
int cvmx_lan_bypass_mode_set(cvmx_lan_bypass_mode_t mode)
{
switch(mode)
{
case CVMX_LAN_BYPASS_GPIO:
/* make lan bypass enable */
cvmx_lan_bypass_init();
cvmx_gpio_set(BYPASS_EN);
CVMX_LAN_BYPASS_MSG("Enable LAN bypass by GPIO. \n");
break;
case CVMX_LAN_BYPASS_WATCHDOG:
/* make lan bypass enable */
cvmx_lan_bypass_init();
/* Set WDT parameters and turn it on */
cvmx_rtc_ds1374_alarm_counter_set(0x1000); /* 4096 ticks = 1 sec */
cvmx_rtc_ds1374_alarm_config(1,1,1);
cvmx_rtc_ds1374_alarm_set(1);
CVMX_LAN_BYPASS_MSG("Enable LAN bypass by WDT. \n");
break;
case CVMX_LAN_BYPASS_OFF:
/* make lan bypass disable */
cvmx_lan_bypass_init();
CVMX_LAN_BYPASS_MSG("Disable LAN bypass. \n");
break;
default:
CVMX_LAN_BYPASS_MSG("%s: LAN bypass mode %d not supported\n", __FUNCTION__, mode);
break;
}
return 0;
}
/**
* Refresh watchdog timer.
*
* Call periodically (less than 1 second) to prevent triggering LAN bypass.
* The alternative cvmx_lan_bypass_keep_alive_ms() is provided for cases
* where a variable interval is required.
*/
void cvmx_lan_bypass_keep_alive(void)
{
cvmx_rtc_ds1374_alarm_counter_set(0x1000); /* 4096 ticks = 1 second */
}
/**
* Refresh watchdog timer, setting a specific expiration interval.
*
* @param interval_ms Interval, in milliseconds, to next watchdog expiration.
*/
void cvmx_lan_bypass_keep_alive_ms(uint32_t interval_ms)
{
cvmx_rtc_ds1374_alarm_counter_set((interval_ms * 0x1000) / 1000);
}
/**
* Control LAN bypass via software.
*
* @param force_bypass Force LAN bypass to active (1) or inactive (0)
*
* @return Error code, or 0 in case of success
*/
int cvmx_lan_bypass_force(int force_bypass)
{
if (force_bypass)
{
//Set GPIO 6
cvmx_gpio_set(BYPASS_EN);
}
else
{
cvmx_lan_bypass_init();
}
return 0;
}
/**
* Return status of LAN bypass circuit.
*
* @return 1 if ports are in LAN bypass, or 0 if normally connected
*/
int cvmx_lan_bypass_is_active(void)
{
return !!(cvmx_gpio_read() & BYPASS_STATUS);
}