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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018 Xilinx, Inc. (Michal Simek)
*/
#include <common.h>
#include <bootstage.h>
#include <dm.h>
#include <errno.h>
#include <init.h>
#include <timer.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <linux/bitops.h>
#include <linux/err.h>
#define CNT_CNTRL_RESET BIT(4)
struct cadence_ttc_regs {
u32 clk_cntrl1; /* 0x0 - Clock Control 1 */
u32 clk_cntrl2; /* 0x4 - Clock Control 2 */
u32 clk_cntrl3; /* 0x8 - Clock Control 3 */
u32 counter_cntrl1; /* 0xC - Counter Control 1 */
u32 counter_cntrl2; /* 0x10 - Counter Control 2 */
u32 counter_cntrl3; /* 0x14 - Counter Control 3 */
u32 counter_val1; /* 0x18 - Counter Control 1 */
u32 counter_val2; /* 0x1C - Counter Control 2 */
u32 counter_val3; /* 0x20 - Counter Control 3 */
u32 reserved[15];
u32 interrupt_enable1; /* 0x60 - Interrupt Enable 1 */
u32 interrupt_enable2; /* 0x64 - Interrupt Enable 2 */
u32 interrupt_enable3; /* 0x68 - Interrupt Enable 3 */
};
struct cadence_ttc_priv {
struct cadence_ttc_regs *regs;
};
#if CONFIG_IS_ENABLED(BOOTSTAGE)
ulong timer_get_boot_us(void)
{
u64 ticks = 0;
u32 rate = 1;
u64 us;
int ret;
ret = dm_timer_init();
if (!ret) {
/* The timer is available */
rate = timer_get_rate(gd->timer);
timer_get_count(gd->timer, &ticks);
} else {
return 0;
}
us = (ticks * 1000) / rate;
return us;
}
#endif
static u64 cadence_ttc_get_count(struct udevice *dev)
{
struct cadence_ttc_priv *priv = dev_get_priv(dev);
return readl(&priv->regs->counter_val1);
}
static int cadence_ttc_probe(struct udevice *dev)
{
struct cadence_ttc_priv *priv = dev_get_priv(dev);
/* Disable interrupts for sure */
writel(0, &priv->regs->interrupt_enable1);
writel(0, &priv->regs->interrupt_enable2);
writel(0, &priv->regs->interrupt_enable3);
/* Make sure that clocks are configured properly without prescaller */
writel(0, &priv->regs->clk_cntrl1);
writel(0, &priv->regs->clk_cntrl2);
writel(0, &priv->regs->clk_cntrl3);
/* Reset and enable this counter */
writel(CNT_CNTRL_RESET, &priv->regs->counter_cntrl1);
return 0;
}
static int cadence_ttc_of_to_plat(struct udevice *dev)
{
struct cadence_ttc_priv *priv = dev_get_priv(dev);
priv->regs = map_physmem(dev_read_addr(dev),
sizeof(struct cadence_ttc_regs), MAP_NOCACHE);
if (IS_ERR(priv->regs))
return PTR_ERR(priv->regs);
return 0;
}
static const struct timer_ops cadence_ttc_ops = {
.get_count = cadence_ttc_get_count,
};
static const struct udevice_id cadence_ttc_ids[] = {
{ .compatible = "cdns,ttc" },
{}
};
U_BOOT_DRIVER(cadence_ttc) = {
.name = "cadence_ttc",
.id = UCLASS_TIMER,
.of_match = cadence_ttc_ids,
.of_to_plat = cadence_ttc_of_to_plat,
.priv_auto = sizeof(struct cadence_ttc_priv),
.probe = cadence_ttc_probe,
.ops = &cadence_ttc_ops,
};
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