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