2 * Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
4 * SPDX-License-Identifier: GPL-2.0+
12 DECLARE_GLOBAL_DATA_PTR
;
15 * Implement a timer uclass to work with lib/time.c. The timer is usually
16 * a 32/64 bits free-running up counter. The get_rate() method is used to get
17 * the input clock frequency of the timer. The get_count() method is used
18 * to get the current 64 bits count value. If the hardware is counting down,
19 * the value should be inversed inside the method. There may be no real
20 * tick, and no timer interrupt.
23 int timer_get_count(struct udevice
*dev
, u64
*count
)
25 const struct timer_ops
*ops
= device_get_ops(dev
);
30 return ops
->get_count(dev
, count
);
33 unsigned long timer_get_rate(struct udevice
*dev
)
35 struct timer_dev_priv
*uc_priv
= dev_get_uclass_priv(dev
);
37 return uc_priv
->clock_rate
;
40 static int timer_pre_probe(struct udevice
*dev
)
42 struct timer_dev_priv
*uc_priv
= dev_get_uclass_priv(dev
);
44 uc_priv
->clock_rate
= fdtdec_get_int(gd
->fdt_blob
, dev
->of_offset
,
45 "clock-frequency", 0);
50 u64
timer_conv_64(u32 count
)
52 /* increment tbh if tbl has rolled over */
53 if (count
< gd
->timebase_l
)
55 gd
->timebase_l
= count
;
56 return ((u64
)gd
->timebase_h
<< 32) | gd
->timebase_l
;
59 UCLASS_DRIVER(timer
) = {
62 .pre_probe
= timer_pre_probe
,
63 .per_device_auto_alloc_size
= sizeof(struct timer_dev_priv
),