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