Angel Pons | 5f249e6 | 2020-04-04 18:51:01 +0200 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
David Hendricks | 8cbd569 | 2017-12-01 20:49:48 -0800 | [diff] [blame] | 2 | |
| 3 | #include <types.h> |
Patrick Rudolph | 88f81af | 2018-04-11 11:40:55 +0200 | [diff] [blame] | 4 | #include <soc/addressmap.h> |
Kyösti Mälkki | 13f6650 | 2019-03-03 08:01:05 +0200 | [diff] [blame] | 5 | #include <device/mmio.h> |
David Hendricks | 8cbd569 | 2017-12-01 20:49:48 -0800 | [diff] [blame] | 6 | #include <soc/cpu.h> |
| 7 | #include <bdk-coreboot.h> |
Patrick Rudolph | 88f81af | 2018-04-11 11:40:55 +0200 | [diff] [blame] | 8 | #include <console/console.h> |
| 9 | #include <timer.h> |
| 10 | #include <delay.h> |
David Hendricks | 8cbd569 | 2017-12-01 20:49:48 -0800 | [diff] [blame] | 11 | |
Patrick Rudolph | 88f81af | 2018-04-11 11:40:55 +0200 | [diff] [blame] | 12 | uint64_t cpu_get_available_core_mask(void) |
David Hendricks | 8cbd569 | 2017-12-01 20:49:48 -0800 | [diff] [blame] | 13 | { |
Patrick Rudolph | 88f81af | 2018-04-11 11:40:55 +0200 | [diff] [blame] | 14 | return read64((void *)RST_PP_AVAILABLE); |
| 15 | } |
| 16 | |
| 17 | size_t cpu_get_num_available_cores(void) |
| 18 | { |
| 19 | return bdk_dpop(cpu_get_available_core_mask()); |
| 20 | } |
| 21 | |
| 22 | static void (*secondary_c_entry)(size_t core_id); |
| 23 | static size_t secondary_booted; |
| 24 | |
| 25 | void secondary_cpu_init(size_t core_id) |
| 26 | { |
| 27 | write64(&secondary_booted, 1); |
| 28 | dmb(); |
| 29 | |
| 30 | if (secondary_c_entry) |
| 31 | secondary_c_entry(core_id); |
| 32 | else |
| 33 | asm("wfi"); |
| 34 | } |
| 35 | |
| 36 | size_t cpu_self_get_core_id(void) |
| 37 | { |
| 38 | u32 mpidr_el1; |
| 39 | asm("mrs %0, MPIDR_EL1\n\t" : "=r" (mpidr_el1) :: "memory"); |
| 40 | |
| 41 | /* Core is 4 bits from AFF0 and rest from AFF1 */ |
| 42 | size_t core_num; |
| 43 | core_num = mpidr_el1 & 0xf; |
| 44 | core_num |= (mpidr_el1 & 0xff00) >> 4; |
| 45 | |
| 46 | return core_num; |
| 47 | } |
| 48 | |
| 49 | uint64_t cpu_self_get_core_mask(void) |
| 50 | { |
| 51 | return 1ULL << cpu_self_get_core_id(); |
| 52 | } |
| 53 | |
| 54 | size_t start_cpu(size_t cpu, void (*entry_64)(size_t core_id)) |
| 55 | { |
| 56 | const uint64_t coremask = 1ULL << cpu; |
| 57 | struct stopwatch sw; |
| 58 | uint64_t pending; |
| 59 | |
| 60 | printk(BIOS_DEBUG, "CPU: Starting CPU%zu @ %p.\n", cpu, entry_64); |
| 61 | |
| 62 | /* Core not available */ |
| 63 | if (!(coremask & cpu_get_available_core_mask())) |
| 64 | return 1; |
| 65 | |
| 66 | /* Only secondary CPUs are supported */ |
| 67 | if (cpu == cpu_self_get_core_id()) |
| 68 | return 1; |
| 69 | |
| 70 | /* Check stack here, instead of in cpu_secondary.S */ |
Julius Werner | 7e0dea6 | 2019-02-20 18:39:22 -0800 | [diff] [blame] | 71 | if ((CONFIG_STACK_SIZE * cpu) > REGION_SIZE(stack_sec)) |
Patrick Rudolph | 88f81af | 2018-04-11 11:40:55 +0200 | [diff] [blame] | 72 | return 1; |
| 73 | |
| 74 | /* Write the address of the main entry point */ |
| 75 | write64((void *)MIO_BOOT_AP_JUMP, (uintptr_t)secondary_init); |
| 76 | |
| 77 | /* Get coremask of cores in reset */ |
| 78 | const uint64_t reset = read64((void *)RST_PP_RESET); |
| 79 | printk(BIOS_INFO, "CPU: Cores currently in reset: 0x%llx\n", reset); |
| 80 | |
| 81 | /* Setup entry for secondary core */ |
| 82 | write64(&secondary_c_entry, (uintptr_t)entry_64); |
| 83 | write64(&secondary_booted, 0); |
| 84 | dmb(); |
| 85 | |
| 86 | printk(BIOS_DEBUG, "CPU: Taking core %zu out of reset.\n", cpu); |
| 87 | |
| 88 | /* Release core from reset */ |
| 89 | write64((void *)RST_PP_RESET, reset & ~coremask); |
| 90 | |
| 91 | /* Wait for cores to finish coming out of reset */ |
| 92 | udelay(1); |
| 93 | |
| 94 | stopwatch_init_usecs_expire(&sw, 1000000); |
| 95 | do { |
| 96 | pending = read64((void *)RST_PP_PENDING); |
| 97 | } while (!stopwatch_expired(&sw) && (pending & coremask)); |
| 98 | |
| 99 | if (stopwatch_expired(&sw)) { |
Julius Werner | e966595 | 2022-01-21 17:06:20 -0800 | [diff] [blame] | 100 | printk(BIOS_ERR, "Timeout waiting for reset " |
Patrick Rudolph | 88f81af | 2018-04-11 11:40:55 +0200 | [diff] [blame] | 101 | "pending to clear."); |
| 102 | return 1; |
| 103 | } |
| 104 | |
| 105 | stopwatch_init_usecs_expire(&sw, 1000000); |
| 106 | |
| 107 | printk(BIOS_DEBUG, "CPU: Wait up to 1s for the core to boot...\n"); |
| 108 | while (!stopwatch_expired(&sw) && !read64(&secondary_booted)) |
| 109 | ; |
| 110 | |
| 111 | /* Cleanup */ |
| 112 | write64(&secondary_c_entry, 0); |
| 113 | dmb(); |
| 114 | |
| 115 | if (!read64(&secondary_booted)) { |
Julius Werner | e966595 | 2022-01-21 17:06:20 -0800 | [diff] [blame] | 116 | printk(BIOS_ERR, "Core %zu failed to start.\n", cpu); |
Patrick Rudolph | 88f81af | 2018-04-11 11:40:55 +0200 | [diff] [blame] | 117 | return 1; |
| 118 | } |
| 119 | |
| 120 | printk(BIOS_INFO, "CPU: Core %zu booted\n", cpu); |
| 121 | return 0; |
David Hendricks | 8cbd569 | 2017-12-01 20:49:48 -0800 | [diff] [blame] | 122 | } |