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)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 ********************************************************************/ sp804_timer_ops_init(uintptr_t base_addr,const timer_ops_t * ops)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 } 58