1 /*
2  * Copyright (c) 2015-2019, 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/arm/sp804_delay_timer.h>
10 #include <drivers/delay_timer.h>
11 #include <lib/mmio.h>
12 
13 uintptr_t sp804_base_addr;
14 
15 #define SP804_TIMER1_LOAD	(sp804_base_addr + 0x000)
16 #define SP804_TIMER1_VALUE	(sp804_base_addr + 0x004)
17 #define SP804_TIMER1_CONTROL	(sp804_base_addr + 0x008)
18 #define SP804_TIMER1_BGLOAD	(sp804_base_addr + 0x018)
19 
20 #define TIMER_CTRL_ONESHOT	(1 << 0)
21 #define TIMER_CTRL_32BIT	(1 << 1)
22 #define TIMER_CTRL_DIV1		(0 << 2)
23 #define TIMER_CTRL_DIV16	(1 << 2)
24 #define TIMER_CTRL_DIV256	(2 << 2)
25 #define TIMER_CTRL_IE		(1 << 5)
26 #define TIMER_CTRL_PERIODIC	(1 << 6)
27 #define TIMER_CTRL_ENABLE	(1 << 7)
28 
29 /********************************************************************
30  * The SP804 timer delay function
31  ********************************************************************/
sp804_get_timer_value(void)32 uint32_t sp804_get_timer_value(void)
33 {
34 	return mmio_read_32(SP804_TIMER1_VALUE);
35 }
36 
37 /********************************************************************
38  * Initialize the 1st timer in the SP804 dual timer with a base
39  * address and a timer ops
40  ********************************************************************/
sp804_timer_ops_init(uintptr_t base_addr,const timer_ops_t * ops)41 void sp804_timer_ops_init(uintptr_t base_addr, const timer_ops_t *ops)
42 {
43 	assert(base_addr != 0);
44 	assert(ops != 0 && ops->get_timer_value == sp804_get_timer_value);
45 
46 	sp804_base_addr = base_addr;
47 	timer_init(ops);
48 
49 	/* disable timer1 */
50 	mmio_write_32(SP804_TIMER1_CONTROL, 0);
51 	mmio_write_32(SP804_TIMER1_LOAD, UINT32_MAX);
52 	mmio_write_32(SP804_TIMER1_VALUE, UINT32_MAX);
53 
54 	/* enable as a free running 32-bit counter */
55 	mmio_write_32(SP804_TIMER1_CONTROL,
56 			TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE);
57 }
58