108 lines
2.7 KiB
C
108 lines
2.7 KiB
C
/*
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* Copyright (C) 2017 Theobroma Systems Design und Consulting GmbH
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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 <mapmem.h>
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#include <asm/arch/timer.h>
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#include <dt-structs.h>
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#include <timer.h>
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#include <asm/io.h>
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DECLARE_GLOBAL_DATA_PTR;
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#if CONFIG_IS_ENABLED(OF_PLATDATA)
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struct rockchip_timer_plat {
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struct dtd_rockchip_rk3368_timer dtd;
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};
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#endif
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/* Driver private data. Contains timer id. Could be either 0 or 1. */
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struct rockchip_timer_priv {
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struct rk_timer *timer;
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};
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static int rockchip_timer_get_count(struct udevice *dev, u64 *count)
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{
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struct rockchip_timer_priv *priv = dev_get_priv(dev);
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uint64_t timebase_h, timebase_l;
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uint64_t cntr;
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timebase_l = readl(&priv->timer->timer_curr_value0);
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timebase_h = readl(&priv->timer->timer_curr_value1);
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/* timers are down-counting */
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cntr = timebase_h << 32 | timebase_l;
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*count = ~0ull - cntr;
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return 0;
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}
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static int rockchip_clk_ofdata_to_platdata(struct udevice *dev)
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{
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#if !CONFIG_IS_ENABLED(OF_PLATDATA)
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struct rockchip_timer_priv *priv = dev_get_priv(dev);
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priv->timer = (struct rk_timer *)devfdt_get_addr(dev);
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#endif
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return 0;
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}
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static int rockchip_timer_start(struct udevice *dev)
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{
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struct rockchip_timer_priv *priv = dev_get_priv(dev);
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const uint64_t reload_val = ~0uLL;
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const uint32_t reload_val_l = reload_val & 0xffffffff;
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const uint32_t reload_val_h = reload_val >> 32;
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/* disable timer and reset all control */
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writel(0, &priv->timer->timer_ctrl_reg);
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/* write reload value */
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writel(reload_val_l, &priv->timer->timer_load_count0);
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writel(reload_val_h, &priv->timer->timer_load_count1);
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/* enable timer */
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writel(1, &priv->timer->timer_ctrl_reg);
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return 0;
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}
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static int rockchip_timer_probe(struct udevice *dev)
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{
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#if CONFIG_IS_ENABLED(OF_PLATDATA)
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struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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struct rockchip_timer_priv *priv = dev_get_priv(dev);
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struct rockchip_timer_plat *plat = dev_get_platdata(dev);
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priv->timer = map_sysmem(plat->dtd.reg[1], plat->dtd.reg[3]);
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uc_priv->clock_rate = plat->dtd.clock_frequency;
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#endif
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return rockchip_timer_start(dev);
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}
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static const struct timer_ops rockchip_timer_ops = {
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.get_count = rockchip_timer_get_count,
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};
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static const struct udevice_id rockchip_timer_ids[] = {
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{ .compatible = "rockchip,rk3368-timer" },
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{}
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};
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U_BOOT_DRIVER(arc_timer) = {
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.name = "rockchip_rk3368_timer",
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.id = UCLASS_TIMER,
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.of_match = rockchip_timer_ids,
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.probe = rockchip_timer_probe,
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.ops = &rockchip_timer_ops,
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.flags = DM_FLAG_PRE_RELOC,
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.priv_auto_alloc_size = sizeof(struct rockchip_timer_priv),
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#if CONFIG_IS_ENABLED(OF_PLATDATA)
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.platdata_auto_alloc_size = sizeof(struct rockchip_timer_plat),
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#endif
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.ofdata_to_platdata = rockchip_clk_ofdata_to_platdata,
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};
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