1 // SPDX-License-Identifier: GPL-2.0+
9 #include <dm/device-internal.h>
15 DECLARE_GLOBAL_DATA_PTR;
18 * Implement a timer uclass to work with lib/time.c. The timer is usually
19 * a 32/64 bits free-running up counter. The get_rate() method is used to get
20 * the input clock frequency of the timer. The get_count() method is used
21 * to get the current 64 bits count value. If the hardware is counting down,
22 * the value should be inversed inside the method. There may be no real
23 * tick, and no timer interrupt.
26 int notrace timer_get_count(struct udevice *dev, u64 *count)
28 const struct timer_ops *ops = device_get_ops(dev);
33 return ops->get_count(dev, count);
36 unsigned long notrace timer_get_rate(struct udevice *dev)
38 struct timer_dev_priv *uc_priv = dev->uclass_priv;
40 return uc_priv->clock_rate;
43 static int timer_pre_probe(struct udevice *dev)
45 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
46 struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
51 /* It is possible that a timer device has a null ofnode */
52 if (!dev_of_valid(dev))
55 err = clk_get_by_index(dev, 0, &timer_clk);
57 ret = clk_get_rate(&timer_clk);
58 if (IS_ERR_VALUE(ret))
60 uc_priv->clock_rate = ret;
63 dev_read_u32_default(dev, "clock-frequency", 0);
70 static int timer_post_probe(struct udevice *dev)
72 struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
74 if (!uc_priv->clock_rate)
80 u64 timer_conv_64(u32 count)
82 /* increment tbh if tbl has rolled over */
83 if (count < gd->timebase_l)
85 gd->timebase_l = count;
86 return ((u64)gd->timebase_h << 32) | gd->timebase_l;
89 int notrace dm_timer_init(void)
91 struct udevice *dev = NULL;
92 __maybe_unused ofnode node;
99 * Directly access gd->dm_root to suppress error messages, if the
100 * virtual root driver does not yet exist.
102 if (gd->dm_root == NULL)
105 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
106 /* Check for a chosen timer to be used for tick */
107 node = ofnode_get_chosen_node("tick-timer");
109 if (ofnode_valid(node) &&
110 uclass_get_device_by_ofnode(UCLASS_TIMER, node, &dev)) {
112 * If the timer is not marked to be bound before
113 * relocation, bind it anyway.
115 if (!lists_bind_fdt(dm_root(), node, &dev, false)) {
116 ret = device_probe(dev);
124 /* Fall back to the first available timer */
125 ret = uclass_first_device_err(UCLASS_TIMER, &dev);
138 UCLASS_DRIVER(timer) = {
141 .pre_probe = timer_pre_probe,
142 .flags = DM_UC_FLAG_SEQ_ALIAS,
143 .post_probe = timer_post_probe,
144 .per_device_auto_alloc_size = sizeof(struct timer_dev_priv),