xref: /rk3399_ARM-atf/drivers/arm/sp804/sp804_delay_timer.c (revision c948f77136c42a92d0bb660543a3600c36dcf7f1)
1 /*
2  * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
3  *
4  * SPDX-License-Identifier: BSD-3-Clause
5  */
6 
7 #include <assert.h>
8 
9 #include <drivers/delay_timer.h>
10 #include <lib/mmio.h>
11 
12 uintptr_t sp804_base_addr;
13 
14 #define SP804_TIMER1_LOAD	(sp804_base_addr + 0x000)
15 #define SP804_TIMER1_VALUE	(sp804_base_addr + 0x004)
16 #define SP804_TIMER1_CONTROL	(sp804_base_addr + 0x008)
17 #define SP804_TIMER1_BGLOAD	(sp804_base_addr + 0x018)
18 
19 #define TIMER_CTRL_ONESHOT	(1 << 0)
20 #define TIMER_CTRL_32BIT	(1 << 1)
21 #define TIMER_CTRL_DIV1		(0 << 2)
22 #define TIMER_CTRL_DIV16	(1 << 2)
23 #define TIMER_CTRL_DIV256	(2 << 2)
24 #define TIMER_CTRL_IE		(1 << 5)
25 #define TIMER_CTRL_PERIODIC	(1 << 6)
26 #define TIMER_CTRL_ENABLE	(1 << 7)
27 
28 /********************************************************************
29  * The SP804 timer delay function
30  ********************************************************************/
31 uint32_t sp804_get_timer_value(void)
32 {
33 	return mmio_read_32(SP804_TIMER1_VALUE);
34 }
35 
36 /********************************************************************
37  * Initialize the 1st timer in the SP804 dual timer with a base
38  * address and a timer ops
39  ********************************************************************/
40 void sp804_timer_ops_init(uintptr_t base_addr, const timer_ops_t *ops)
41 {
42 	assert(base_addr != 0);
43 	assert(ops != 0 && ops->get_timer_value == sp804_get_timer_value);
44 
45 	sp804_base_addr = base_addr;
46 	timer_init(ops);
47 
48 	/* disable timer1 */
49 	mmio_write_32(SP804_TIMER1_CONTROL, 0);
50 	mmio_write_32(SP804_TIMER1_LOAD, UINT32_MAX);
51 	mmio_write_32(SP804_TIMER1_VALUE, UINT32_MAX);
52 
53 	/* enable as a free running 32-bit counter */
54 	mmio_write_32(SP804_TIMER1_CONTROL,
55 			TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE);
56 }
57