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/*
* Copyright (C) Marvell International Ltd. and its affiliates
* Written-by: Prafulla Wadaskar <prafulla@marvell.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/soc.h>
#define UBOOT_CNTR 0 /* counter to use for U-Boot timer */
/*
* ARM Timers Registers Map
*/
#define CNTMR_CTRL_REG &tmr_regs->ctrl
#define CNTMR_RELOAD_REG(tmrnum) &tmr_regs->tmr[tmrnum].reload
#define CNTMR_VAL_REG(tmrnum) &tmr_regs->tmr[tmrnum].val
/*
* ARM Timers Control Register
* CPU_TIMERS_CTRL_REG (CTCR)
*/
#define CTCR_ARM_TIMER_EN_OFFS(cntr) (cntr * 2)
#define CTCR_ARM_TIMER_EN(cntr) (1 << CTCR_ARM_TIMER_EN_OFFS(cntr))
#define CTCR_ARM_TIMER_AUTO_OFFS(cntr) ((cntr * 2) + 1)
#define CTCR_ARM_TIMER_AUTO_EN(cntr) (1 << CTCR_ARM_TIMER_AUTO_OFFS(cntr))
/* Only Armada XP have the 25MHz enable bit (Kirkwood doesn't) */
#if defined(CONFIG_ARMADA_XP)
#define CTCR_ARM_TIMER_25MHZ_OFFS(cntr) (cntr + 11)
#define CTCR_ARM_TIMER_25MHZ(cntr) (1 << CTCR_ARM_TIMER_25MHZ_OFFS(cntr))
#else
#define CTCR_ARM_TIMER_25MHZ(cntr) 0
#endif
#define TIMER_LOAD_VAL 0xffffffff
#define timestamp gd->arch.tbl
#define lastdec gd->arch.lastinc
static int init_done __attribute__((section(".data"))) = 0;
/* Timer reload and current value registers */
struct kwtmr_val {
u32 reload; /* Timer reload reg */
u32 val; /* Timer value reg */
};
/* Timer registers */
struct kwtmr_registers {
u32 ctrl; /* Timer control reg */
u32 pad[3];
struct kwtmr_val tmr[4];
u32 wdt_reload;
u32 wdt_val;
};
DECLARE_GLOBAL_DATA_PTR;
static struct kwtmr_registers *tmr_regs =
(struct kwtmr_registers *)MVEBU_TIMER_BASE;
static inline ulong read_timer(void)
{
return readl(CNTMR_VAL_REG(UBOOT_CNTR)) / (CONFIG_SYS_TCLK / 1000);
}
ulong get_timer_masked(void)
{
ulong now = read_timer();
if (lastdec >= now) {
/* normal mode */
timestamp += lastdec - now;
} else {
/* we have an overflow ... */
timestamp += lastdec +
(TIMER_LOAD_VAL / (CONFIG_SYS_TCLK / 1000)) - now;
}
lastdec = now;
return timestamp;
}
ulong get_timer(ulong base)
{
return get_timer_masked() - base;
}
void __udelay(unsigned long usec)
{
uint current;
ulong delayticks;
current = readl(CNTMR_VAL_REG(UBOOT_CNTR));
delayticks = (usec * (CONFIG_SYS_TCLK / 1000000));
if (current < delayticks) {
delayticks -= current;
while (readl(CNTMR_VAL_REG(UBOOT_CNTR)) < current) ;
while ((TIMER_LOAD_VAL - delayticks) <
readl(CNTMR_VAL_REG(UBOOT_CNTR))) ;
} else {
while (readl(CNTMR_VAL_REG(UBOOT_CNTR)) >
(current - delayticks)) ;
}
}
/*
* init the counter
*/
int timer_init(void)
{
/* Only init the timer once */
if (init_done)
return 0;
init_done = 1;
/* load value into timer */
writel(TIMER_LOAD_VAL, CNTMR_RELOAD_REG(UBOOT_CNTR));
writel(TIMER_LOAD_VAL, CNTMR_VAL_REG(UBOOT_CNTR));
/* enable timer in auto reload mode */
clrsetbits_le32(CNTMR_CTRL_REG, CTCR_ARM_TIMER_25MHZ(UBOOT_CNTR),
CTCR_ARM_TIMER_EN(UBOOT_CNTR) |
CTCR_ARM_TIMER_AUTO_EN(UBOOT_CNTR));
/* init the timestamp and lastdec value */
lastdec = read_timer();
timestamp = 0;
return 0;
}
/*
* This function is derived from PowerPC code (read timebase as long long).
* On ARM it just returns the timer value.
*/
unsigned long long get_ticks(void)
{
return get_timer(0);
}
/*
* This function is derived from PowerPC code (timebase clock frequency).
* On ARM it returns the number of timer ticks per second.
*/
ulong get_tbclk (void)
{
return (ulong)CONFIG_SYS_HZ;
}
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