u-boot/arch/arm/cpu/arm926ejs/pantheon/timer.c
Lei Wen 0c0d9b708b ARM: pantheon: reduce dependence of including platform file
For files like the drivers/serial/serial.c, it must include the platform
file, as the CONFIG_SYS_NS16550_COM1 must reference to the definition in
the platform definition files.

Include the platform definition file in the config file, so that it
would decouple the dependence for the driver files.

Signed-off-by: Lei Wen <leiwen@marvell.com>
2011-10-27 21:56:33 +02:00

199 lines
5 KiB
C

/*
* (C) Copyright 2011
* Marvell Semiconductor <www.marvell.com>
* Written-by: Lei Wen <leiwen@marvell.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#include <common.h>
#include <asm/arch/cpu.h>
#include <asm/arch/pantheon.h>
/*
* Timer registers
* Refer 6.2.9 in Datasheet
*/
struct panthtmr_registers {
u32 clk_ctrl; /* Timer clk control reg */
u32 match[9]; /* Timer match registers */
u32 count[3]; /* Timer count registers */
u32 status[3];
u32 ie[3];
u32 preload[3]; /* Timer preload value */
u32 preload_ctrl[3];
u32 wdt_match_en;
u32 wdt_match_r;
u32 wdt_val;
u32 wdt_sts;
u32 icr[3];
u32 wdt_icr;
u32 cer; /* Timer count enable reg */
u32 cmr;
u32 ilr[3];
u32 wcr;
u32 wfar;
u32 wsar;
u32 cvwr[3];
};
#define TIMER 0 /* Use TIMER 0 */
/* Each timer has 3 match registers */
#define MATCH_CMP(x) ((3 * TIMER) + x)
#define TIMER_LOAD_VAL 0xffffffff
#define COUNT_RD_REQ 0x1
DECLARE_GLOBAL_DATA_PTR;
/* Using gd->tbu from timestamp and gd->tbl for lastdec */
/*
* For preventing risk of instability in reading counter value,
* first set read request to register cvwr and then read same
* register after it captures counter value.
*/
ulong read_timer(void)
{
struct panthtmr_registers *panthtimers =
(struct panthtmr_registers *) PANTHEON_TIMER_BASE;
volatile int loop=100;
ulong val;
writel(COUNT_RD_REQ, &panthtimers->cvwr);
while (loop--)
val = readl(&panthtimers->cvwr);
/*
* This stop gcc complain and prevent loop mistake init to 0
*/
val = readl(&panthtimers->cvwr);
return val;
}
ulong get_timer_masked(void)
{
ulong now = read_timer();
if (now >= gd->tbl) {
/* normal mode */
gd->tbu += now - gd->tbl;
} else {
/* we have an overflow ... */
gd->tbu += now + TIMER_LOAD_VAL - gd->tbl;
}
gd->tbl = now;
return gd->tbu;
}
ulong get_timer(ulong base)
{
return ((get_timer_masked() / (CONFIG_SYS_HZ_CLOCK / 1000)) -
base);
}
void __udelay(unsigned long usec)
{
ulong delayticks;
ulong endtime;
delayticks = (usec * (CONFIG_SYS_HZ_CLOCK / 1000000));
endtime = get_timer_masked() + delayticks;
while (get_timer_masked() < endtime)
;
}
/*
* init the Timer
*/
int timer_init(void)
{
struct panthapb_registers *apb1clkres =
(struct panthapb_registers *) PANTHEON_APBC_BASE;
struct panthtmr_registers *panthtimers =
(struct panthtmr_registers *) PANTHEON_TIMER_BASE;
/* Enable Timer clock at 3.25 MHZ */
writel(APBC_APBCLK | APBC_FNCLK | APBC_FNCLKSEL(3), &apb1clkres->timers);
/* load value into timer */
writel(0x0, &panthtimers->clk_ctrl);
/* Use Timer 0 Match Resiger 0 */
writel(TIMER_LOAD_VAL, &panthtimers->match[MATCH_CMP(0)]);
/* Preload value is 0 */
writel(0x0, &panthtimers->preload[TIMER]);
/* Enable match comparator 0 for Timer 0 */
writel(0x1, &panthtimers->preload_ctrl[TIMER]);
/* Enable timer 0 */
writel(0x1, &panthtimers->cer);
/* init the gd->tbu and gd->tbl value */
gd->tbl = read_timer();
gd->tbu = 0;
return 0;
}
#define MPMU_APRR_WDTR (1<<4)
#define TMR_WFAR 0xbaba /* WDT Register First key */
#define TMP_WSAR 0xeb10 /* WDT Register Second key */
/*
* This function uses internal Watchdog Timer
* based reset mechanism.
* Steps to write watchdog registers (protected access)
* 1. Write key value to TMR_WFAR reg.
* 2. Write key value to TMP_WSAR reg.
* 3. Perform write operation.
*/
void reset_cpu (unsigned long ignored)
{
struct panthmpmu_registers *mpmu =
(struct panthmpmu_registers *) PANTHEON_MPMU_BASE;
struct panthtmr_registers *panthtimers =
(struct panthtmr_registers *) PANTHEON_WD_TIMER_BASE;
u32 val;
/* negate hardware reset to the WDT after system reset */
val = readl(&mpmu->aprr);
val = val | MPMU_APRR_WDTR;
writel(val, &mpmu->aprr);
/* reset/enable WDT clock */
writel(APBC_APBCLK, &mpmu->wdtpcr);
/* clear previous WDT status */
writel(TMR_WFAR, &panthtimers->wfar);
writel(TMP_WSAR, &panthtimers->wsar);
writel(0, &panthtimers->wdt_sts);
/* set match counter */
writel(TMR_WFAR, &panthtimers->wfar);
writel(TMP_WSAR, &panthtimers->wsar);
writel(0xf, &panthtimers->wdt_match_r);
/* enable WDT reset */
writel(TMR_WFAR, &panthtimers->wfar);
writel(TMP_WSAR, &panthtimers->wsar);
writel(0x3, &panthtimers->wdt_match_en);
/*enable functional WDT clock */
writel(APBC_APBCLK | APBC_FNCLK, &mpmu->wdtpcr);
}