1 /* 2 * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * Redistributions of source code must retain the above copyright notice, this 8 * list of conditions and the following disclaimer. 9 * 10 * Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * Neither the name of ARM nor the names of its contributors may be used 15 * to endorse or promote products derived from this software without specific 16 * prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <assert.h> 32 #include <delay_timer.h> 33 #include <mmio.h> 34 35 uintptr_t sp804_base_addr; 36 37 #define SP804_TIMER1_LOAD (sp804_base_addr + 0x000) 38 #define SP804_TIMER1_VALUE (sp804_base_addr + 0x004) 39 #define SP804_TIMER1_CONTROL (sp804_base_addr + 0x008) 40 #define SP804_TIMER1_BGLOAD (sp804_base_addr + 0x018) 41 42 #define TIMER_CTRL_ONESHOT (1 << 0) 43 #define TIMER_CTRL_32BIT (1 << 1) 44 #define TIMER_CTRL_DIV1 (0 << 2) 45 #define TIMER_CTRL_DIV16 (1 << 2) 46 #define TIMER_CTRL_DIV256 (2 << 2) 47 #define TIMER_CTRL_IE (1 << 5) 48 #define TIMER_CTRL_PERIODIC (1 << 6) 49 #define TIMER_CTRL_ENABLE (1 << 7) 50 51 /******************************************************************** 52 * The SP804 timer delay function 53 ********************************************************************/ 54 uint32_t sp804_get_timer_value(void) 55 { 56 return mmio_read_32(SP804_TIMER1_VALUE); 57 } 58 59 /******************************************************************** 60 * Initialize the 1st timer in the SP804 dual timer with a base 61 * address and a timer ops 62 ********************************************************************/ 63 void sp804_timer_ops_init(uintptr_t base_addr, const timer_ops_t *ops) 64 { 65 assert(base_addr != 0); 66 assert(ops != 0 && ops->get_timer_value == sp804_get_timer_value); 67 68 sp804_base_addr = base_addr; 69 timer_init(ops); 70 71 /* disable timer1 */ 72 mmio_write_32(SP804_TIMER1_CONTROL, 0); 73 mmio_write_32(SP804_TIMER1_LOAD, UINT32_MAX); 74 mmio_write_32(SP804_TIMER1_VALUE, UINT32_MAX); 75 76 /* enable as a free running 32-bit counter */ 77 mmio_write_32(SP804_TIMER1_CONTROL, 78 TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE); 79 } 80