mirror of
https://github.com/AsahiLinux/u-boot
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e660cfad53
To make the OMAP DM timer driver useful for the timing of bootstages, we need to implement timer_get_boot_us(..). Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
127 lines
3 KiB
C
127 lines
3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* TI OMAP timer driver
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*
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* Copyright (C) 2015, Texas Instruments, Incorporated
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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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#include <asm/arch/clock.h>
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#include <linux/bitops.h>
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/* Timer register bits */
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#define TCLR_START BIT(0) /* Start=1 */
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#define TCLR_AUTO_RELOAD BIT(1) /* Auto reload */
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#define TCLR_PRE_EN BIT(5) /* Pre-scaler enable */
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#define TCLR_PTV_SHIFT (2) /* Pre-scaler shift value */
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struct omap_gptimer_regs {
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unsigned int tidr; /* offset 0x00 */
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unsigned char res1[12];
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unsigned int tiocp_cfg; /* offset 0x10 */
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unsigned char res2[12];
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unsigned int tier; /* offset 0x20 */
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unsigned int tistatr; /* offset 0x24 */
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unsigned int tistat; /* offset 0x28 */
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unsigned int tisr; /* offset 0x2c */
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unsigned int tcicr; /* offset 0x30 */
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unsigned int twer; /* offset 0x34 */
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unsigned int tclr; /* offset 0x38 */
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unsigned int tcrr; /* offset 0x3c */
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unsigned int tldr; /* offset 0x40 */
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unsigned int ttgr; /* offset 0x44 */
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unsigned int twpc; /* offset 0x48 */
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unsigned int tmar; /* offset 0x4c */
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unsigned int tcar1; /* offset 0x50 */
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unsigned int tscir; /* offset 0x54 */
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unsigned int tcar2; /* offset 0x58 */
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};
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/* Omap Timer Priv */
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struct omap_timer_priv {
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struct omap_gptimer_regs *regs;
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};
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static u64 omap_timer_get_count(struct udevice *dev)
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{
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struct omap_timer_priv *priv = dev_get_priv(dev);
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return timer_conv_64(readl(&priv->regs->tcrr));
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}
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static int omap_timer_probe(struct udevice *dev)
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{
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struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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struct omap_timer_priv *priv = dev_get_priv(dev);
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if (!uc_priv->clock_rate)
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uc_priv->clock_rate = V_SCLK;
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uc_priv->clock_rate /= (2 << CONFIG_SYS_PTV);
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/* start the counter ticking up, reload value on overflow */
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writel(0, &priv->regs->tldr);
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writel(0, &priv->regs->tcrr);
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/* enable timer */
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writel((CONFIG_SYS_PTV << 2) | TCLR_PRE_EN | TCLR_AUTO_RELOAD |
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TCLR_START, &priv->regs->tclr);
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return 0;
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}
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static int omap_timer_of_to_plat(struct udevice *dev)
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{
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struct omap_timer_priv *priv = dev_get_priv(dev);
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priv->regs = map_physmem(dev_read_addr(dev),
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sizeof(struct omap_gptimer_regs), MAP_NOCACHE);
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return 0;
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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 const struct timer_ops omap_timer_ops = {
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.get_count = omap_timer_get_count,
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};
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static const struct udevice_id omap_timer_ids[] = {
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{ .compatible = "ti,am335x-timer" },
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{ .compatible = "ti,am4372-timer" },
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{ .compatible = "ti,omap5430-timer" },
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{}
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};
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U_BOOT_DRIVER(omap_timer) = {
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.name = "omap_timer",
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.id = UCLASS_TIMER,
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.of_match = omap_timer_ids,
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.of_to_plat = omap_timer_of_to_plat,
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.priv_auto = sizeof(struct omap_timer_priv),
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.probe = omap_timer_probe,
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.ops = &omap_timer_ops,
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};
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