2 * Copyright (C) 2017 Theobroma Systems Design und Consulting GmbH
4 * SPDX-License-Identifier: GPL-2.0+
10 #include <asm/arch/timer.h>
11 #include <dt-structs.h>
15 DECLARE_GLOBAL_DATA_PTR;
17 #if CONFIG_IS_ENABLED(OF_PLATDATA)
18 struct rockchip_timer_plat {
19 struct dtd_rockchip_rk3368_timer dtd;
23 /* Driver private data. Contains timer id. Could be either 0 or 1. */
24 struct rockchip_timer_priv {
25 struct rk_timer *timer;
28 static int rockchip_timer_get_count(struct udevice *dev, u64 *count)
30 struct rockchip_timer_priv *priv = dev_get_priv(dev);
31 uint64_t timebase_h, timebase_l;
34 timebase_l = readl(&priv->timer->timer_curr_value0);
35 timebase_h = readl(&priv->timer->timer_curr_value1);
37 /* timers are down-counting */
38 cntr = timebase_h << 32 | timebase_l;
39 *count = ~0ull - cntr;
43 static int rockchip_clk_ofdata_to_platdata(struct udevice *dev)
45 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
46 struct rockchip_timer_priv *priv = dev_get_priv(dev);
48 priv->timer = (struct rk_timer *)devfdt_get_addr(dev);
54 static int rockchip_timer_start(struct udevice *dev)
56 struct rockchip_timer_priv *priv = dev_get_priv(dev);
57 const uint64_t reload_val = ~0uLL;
58 const uint32_t reload_val_l = reload_val & 0xffffffff;
59 const uint32_t reload_val_h = reload_val >> 32;
61 /* disable timer and reset all control */
62 writel(0, &priv->timer->timer_ctrl_reg);
63 /* write reload value */
64 writel(reload_val_l, &priv->timer->timer_load_count0);
65 writel(reload_val_h, &priv->timer->timer_load_count1);
67 writel(1, &priv->timer->timer_ctrl_reg);
72 static int rockchip_timer_probe(struct udevice *dev)
74 #if CONFIG_IS_ENABLED(OF_PLATDATA)
75 struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
76 struct rockchip_timer_priv *priv = dev_get_priv(dev);
77 struct rockchip_timer_plat *plat = dev_get_platdata(dev);
79 priv->timer = map_sysmem(plat->dtd.reg[1], plat->dtd.reg[3]);
80 uc_priv->clock_rate = plat->dtd.clock_frequency;
83 return rockchip_timer_start(dev);
86 static const struct timer_ops rockchip_timer_ops = {
87 .get_count = rockchip_timer_get_count,
90 static const struct udevice_id rockchip_timer_ids[] = {
91 { .compatible = "rockchip,rk3368-timer" },
95 U_BOOT_DRIVER(arc_timer) = {
96 .name = "rockchip_rk3368_timer",
98 .of_match = rockchip_timer_ids,
99 .probe = rockchip_timer_probe,
100 .ops = &rockchip_timer_ops,
101 .flags = DM_FLAG_PRE_RELOC,
102 .priv_auto_alloc_size = sizeof(struct rockchip_timer_priv),
103 #if CONFIG_IS_ENABLED(OF_PLATDATA)
104 .platdata_auto_alloc_size = sizeof(struct rockchip_timer_plat),
106 .ofdata_to_platdata = rockchip_clk_ofdata_to_platdata,