2 * Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
4 * SPDX-License-Identifier: GPL-2.0+
10 #include <dm/device-internal.h>
14 DECLARE_GLOBAL_DATA_PTR
;
17 * Implement a timer uclass to work with lib/time.c. The timer is usually
18 * a 32/64 bits free-running up counter. The get_rate() method is used to get
19 * the input clock frequency of the timer. The get_count() method is used
20 * to get the current 64 bits count value. If the hardware is counting down,
21 * the value should be inversed inside the method. There may be no real
22 * tick, and no timer interrupt.
25 int timer_get_count(struct udevice
*dev
, u64
*count
)
27 const struct timer_ops
*ops
= device_get_ops(dev
);
32 return ops
->get_count(dev
, count
);
35 unsigned long timer_get_rate(struct udevice
*dev
)
37 struct timer_dev_priv
*uc_priv
= dev_get_uclass_priv(dev
);
39 return uc_priv
->clock_rate
;
42 static int timer_pre_probe(struct udevice
*dev
)
44 struct timer_dev_priv
*uc_priv
= dev_get_uclass_priv(dev
);
46 uc_priv
->clock_rate
= fdtdec_get_int(gd
->fdt_blob
, dev
->of_offset
,
47 "clock-frequency", 0);
52 u64
timer_conv_64(u32 count
)
54 /* increment tbh if tbl has rolled over */
55 if (count
< gd
->timebase_l
)
57 gd
->timebase_l
= count
;
58 return ((u64
)gd
->timebase_h
<< 32) | gd
->timebase_l
;
61 int notrace
dm_timer_init(void)
63 const void *blob
= gd
->fdt_blob
;
64 struct udevice
*dev
= NULL
;
71 /* Check for a chosen timer to be used for tick */
72 node
= fdtdec_get_chosen_node(blob
, "tick-timer");
74 /* No chosen timer, trying first available timer */
75 ret
= uclass_first_device(UCLASS_TIMER
, &dev
);
81 if (uclass_get_device_by_of_offset(UCLASS_TIMER
, node
, &dev
)) {
83 * If the timer is not marked to be bound before
84 * relocation, bind it anyway.
87 !lists_bind_fdt(gd
->dm_root
, blob
, node
, &dev
)) {
88 ret
= device_probe(dev
);
103 UCLASS_DRIVER(timer
) = {
106 .pre_probe
= timer_pre_probe
,
107 .flags
= DM_UC_FLAG_SEQ_ALIAS
,
108 .per_device_auto_alloc_size
= sizeof(struct timer_dev_priv
),