Add ARM global timer based timer Signed-off-by: Patrice Chotard <patrice.chotard@st.com> Reviewed-by: Simon Glass <sjg@chromium.org>master
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/*
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* (C) Copyright 2017 Patrice Chotard <patrice.chotard@st.com> |
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#include <common.h> |
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#include <dm.h> |
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#include <fdtdec.h> |
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#include <timer.h> |
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#include <asm/io.h> |
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#include <asm/arch-armv7/globaltimer.h> |
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DECLARE_GLOBAL_DATA_PTR; |
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struct sti_timer_priv { |
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struct globaltimer *global_timer; |
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}; |
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static int sti_timer_get_count(struct udevice *dev, u64 *count) |
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{ |
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struct sti_timer_priv *priv = dev_get_priv(dev); |
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struct globaltimer *global_timer = priv->global_timer; |
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u32 low, high; |
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u64 timer; |
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u32 old = readl(&global_timer->cnt_h); |
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while (1) { |
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low = readl(&global_timer->cnt_l); |
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high = readl(&global_timer->cnt_h); |
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if (old == high) |
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break; |
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else |
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old = high; |
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} |
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timer = high; |
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*count = (u64)((timer << 32) | low); |
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return 0; |
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} |
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static int sti_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 sti_timer_priv *priv = dev_get_priv(dev); |
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fdt_addr_t addr; |
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uc_priv->clock_rate = CONFIG_SYS_HZ_CLOCK; |
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/* get arm global timer base address */ |
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addr = fdtdec_get_addr(gd->fdt_blob, dev_of_offset(dev), "reg"); |
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priv->global_timer = (struct globaltimer *)addr; |
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/* init timer */ |
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writel(0x01, &priv->global_timer->ctl); |
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return 0; |
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} |
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static const struct timer_ops sti_timer_ops = { |
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.get_count = sti_timer_get_count, |
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}; |
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static const struct udevice_id sti_timer_ids[] = { |
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{ .compatible = "arm,cortex-a9-global-timer" }, |
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{} |
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}; |
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U_BOOT_DRIVER(sti_timer) = { |
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.name = "sti_timer", |
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.id = UCLASS_TIMER, |
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.of_match = sti_timer_ids, |
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.priv_auto_alloc_size = sizeof(struct sti_timer_priv), |
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.probe = sti_timer_probe, |
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.ops = &sti_timer_ops, |
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.flags = DM_FLAG_PRE_RELOC, |
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}; |
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