| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * Copyright (C) 2017, STMicroelectronics - All Rights Reserved |
| * Author(s): Patrice Chotard, <patrice.chotard@foss.st.com> for STMicroelectronics. |
| */ |
| |
| #include <common.h> |
| #include <dm.h> |
| #include <clk.h> |
| #include <timer.h> |
| #include <linux/err.h> |
| |
| #include <asm/io.h> |
| #include <asm/arch-armv7/globaltimer.h> |
| |
| struct sti_timer_priv { |
| struct globaltimer *global_timer; |
| }; |
| |
| static u64 sti_timer_get_count(struct udevice *dev) |
| { |
| struct sti_timer_priv *priv = dev_get_priv(dev); |
| struct globaltimer *global_timer = priv->global_timer; |
| u32 low, high; |
| u64 timer; |
| u32 old = readl(&global_timer->cnt_h); |
| |
| while (1) { |
| low = readl(&global_timer->cnt_l); |
| high = readl(&global_timer->cnt_h); |
| if (old == high) |
| break; |
| else |
| old = high; |
| } |
| timer = high; |
| return (u64)((timer << 32) | low); |
| } |
| |
| static int sti_timer_probe(struct udevice *dev) |
| { |
| struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev); |
| struct sti_timer_priv *priv = dev_get_priv(dev); |
| struct clk clk; |
| int err; |
| ulong ret; |
| |
| /* get arm global timer base address */ |
| priv->global_timer = (struct globaltimer *)dev_read_addr_ptr(dev); |
| if (!priv->global_timer) |
| return -ENOENT; |
| |
| err = clk_get_by_index(dev, 0, &clk); |
| if (!err) { |
| ret = clk_get_rate(&clk); |
| if (IS_ERR_VALUE(ret)) |
| return ret; |
| uc_priv->clock_rate = ret; |
| } else { |
| uc_priv->clock_rate = CONFIG_SYS_HZ_CLOCK; |
| } |
| |
| /* init timer */ |
| writel(0x01, &priv->global_timer->ctl); |
| |
| return 0; |
| } |
| |
| static const struct timer_ops sti_timer_ops = { |
| .get_count = sti_timer_get_count, |
| }; |
| |
| static const struct udevice_id sti_timer_ids[] = { |
| { .compatible = "arm,cortex-a9-global-timer" }, |
| {} |
| }; |
| |
| U_BOOT_DRIVER(sti_timer) = { |
| .name = "sti_timer", |
| .id = UCLASS_TIMER, |
| .of_match = sti_timer_ids, |
| .priv_auto_alloc_size = sizeof(struct sti_timer_priv), |
| .probe = sti_timer_probe, |
| .ops = &sti_timer_ops, |
| }; |