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Ryan Harkin03925792015-03-17 14:52:39 +00001/*
Ambroise Vincenta88a35d2019-02-14 09:48:21 +00002 * Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
Ryan Harkin03925792015-03-17 14:52:39 +00003 *
dp-armfa3cf0b2017-05-03 09:38:09 +01004 * SPDX-License-Identifier: BSD-3-Clause
Ryan Harkin03925792015-03-17 14:52:39 +00005 */
6
7#include <assert.h>
Antonio Nino Diaze0f90632018-12-14 00:18:21 +00008
Ambroise Vincenta88a35d2019-02-14 09:48:21 +00009#include <drivers/arm/sp804_delay_timer.h>
Antonio Nino Diaze0f90632018-12-14 00:18:21 +000010#include <drivers/delay_timer.h>
11#include <lib/mmio.h>
Ryan Harkin03925792015-03-17 14:52:39 +000012
13uintptr_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 ********************************************************************/
32uint32_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 ********************************************************************/
41void 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}