| Sandrine Bailleux | 3cd87d7 | 2018-10-09 11:12:55 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2018, Arm Limited. All rights reserved. |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #include <arch.h> |
| 8 | #include <arch_helpers.h> |
| 9 | #include <assert.h> |
| 10 | #include <platform.h> |
| 11 | |
| 12 | /******************************************************************************* |
| 13 | * Data structure to keep track of per-cpu secure generic timer context across |
| 14 | * power management operations. |
| 15 | ******************************************************************************/ |
| 16 | typedef struct timer_context { |
| 17 | uint64_t cval; |
| 18 | uint32_t ctl; |
| 19 | } timer_context_t; |
| 20 | |
| 21 | static timer_context_t pcpu_timer_context[PLATFORM_CORE_COUNT]; |
| 22 | |
| 23 | /******************************************************************************* |
| 24 | * This function initializes the generic timer to fire every `timeo` ms. |
| 25 | ******************************************************************************/ |
| 26 | void private_timer_start(unsigned long timeo) |
| 27 | { |
| 28 | uint64_t cval, freq; |
| 29 | uint32_t ctl = 0; |
| 30 | |
| 31 | /* Any previous pending timer activation will be disabled. */ |
| 32 | cval = read_cntpct_el0(); |
| 33 | freq = read_cntfrq_el0(); |
| 34 | cval += (freq * timeo) / 1000; |
| 35 | write_cnthp_cval_el2(cval); |
| 36 | |
| 37 | /* Enable the secure physical timer */ |
| 38 | set_cntp_ctl_enable(ctl); |
| 39 | write_cnthp_ctl_el2(ctl); |
| 40 | } |
| 41 | |
| 42 | /******************************************************************************* |
| 43 | * This function deasserts the timer interrupt prior to cpu power down |
| 44 | ******************************************************************************/ |
| 45 | void private_timer_stop(void) |
| 46 | { |
| 47 | /* Disable the timer */ |
| 48 | write_cnthp_ctl_el2(0); |
| 49 | } |
| 50 | |
| 51 | /******************************************************************************* |
| 52 | * This function saves the timer context prior to cpu suspension |
| 53 | ******************************************************************************/ |
| 54 | void private_timer_save(void) |
| 55 | { |
| 56 | uint32_t linear_id = platform_get_core_pos(read_mpidr_el1()); |
| 57 | |
| 58 | pcpu_timer_context[linear_id].cval = read_cnthp_cval_el2(); |
| 59 | pcpu_timer_context[linear_id].ctl = read_cnthp_ctl_el2(); |
| 60 | flush_dcache_range((uintptr_t) &pcpu_timer_context[linear_id], |
| 61 | sizeof(pcpu_timer_context[linear_id])); |
| 62 | } |
| 63 | |
| 64 | /******************************************************************************* |
| 65 | * This function restores the timer context post cpu resummption |
| 66 | ******************************************************************************/ |
| 67 | void private_timer_restore(void) |
| 68 | { |
| 69 | uint32_t linear_id = platform_get_core_pos(read_mpidr_el1()); |
| 70 | |
| 71 | write_cnthp_cval_el2(pcpu_timer_context[linear_id].cval); |
| 72 | write_cnthp_ctl_el2(pcpu_timer_context[linear_id].ctl); |
| 73 | } |