Andre Przywara | 6d471e1 | 2019-07-09 11:25:57 +0100 | [diff] [blame] | 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 <libfdt.h> |
| 10 | |
| 11 | #include <platform_def.h> |
| 12 | #include <common/bl_common.h> |
| 13 | #include <lib/mmio.h> |
| 14 | #include <lib/xlat_tables/xlat_mmu_helpers.h> |
| 15 | #include <lib/xlat_tables/xlat_tables_defs.h> |
Andre Przywara | 2d8e99a | 2019-07-10 18:09:18 +0100 | [diff] [blame^] | 16 | #include <lib/xlat_tables/xlat_tables_v2.h> |
Andre Przywara | 6d471e1 | 2019-07-09 11:25:57 +0100 | [diff] [blame] | 17 | #include <plat/common/platform.h> |
| 18 | |
| 19 | #include <drivers/arm/gicv2.h> |
| 20 | |
| 21 | #include <rpi_shared.h> |
| 22 | |
Andre Przywara | 2d8e99a | 2019-07-10 18:09:18 +0100 | [diff] [blame^] | 23 | /* |
| 24 | * Fields at the beginning of armstub8.bin. |
| 25 | * While building the BL31 image, we put the stub magic into the binary. |
| 26 | * The GPU firmware detects this at boot time, clears that field as a |
| 27 | * confirmation and puts the kernel and DT address in the following words. |
| 28 | */ |
| 29 | extern uint32_t stub_magic; |
| 30 | |
Andre Przywara | 6d471e1 | 2019-07-09 11:25:57 +0100 | [diff] [blame] | 31 | static const gicv2_driver_data_t rpi4_gic_data = { |
| 32 | .gicd_base = RPI4_GIC_GICD_BASE, |
| 33 | .gicc_base = RPI4_GIC_GICC_BASE, |
| 34 | }; |
| 35 | |
| 36 | /* |
| 37 | * To be filled by the code below. At the moment BL32 is not supported. |
| 38 | * In the future these might be passed down from BL2. |
| 39 | */ |
| 40 | static entry_point_info_t bl32_image_ep_info; |
| 41 | static entry_point_info_t bl33_image_ep_info; |
| 42 | |
| 43 | /******************************************************************************* |
| 44 | * Return a pointer to the 'entry_point_info' structure of the next image for |
| 45 | * the security state specified. BL33 corresponds to the non-secure image type |
| 46 | * while BL32 corresponds to the secure image type. A NULL pointer is returned |
| 47 | * if the image does not exist. |
| 48 | ******************************************************************************/ |
| 49 | entry_point_info_t *bl31_plat_get_next_image_ep_info(uint32_t type) |
| 50 | { |
| 51 | entry_point_info_t *next_image_info; |
| 52 | |
| 53 | assert(sec_state_is_valid(type) != 0); |
| 54 | |
| 55 | next_image_info = (type == NON_SECURE) |
| 56 | ? &bl33_image_ep_info : &bl32_image_ep_info; |
| 57 | |
| 58 | /* None of the images can have 0x0 as the entrypoint. */ |
| 59 | if (next_image_info->pc) { |
| 60 | return next_image_info; |
| 61 | } else { |
| 62 | return NULL; |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | static void ldelay(register_t delay) |
| 67 | { |
| 68 | __asm__ volatile ( |
| 69 | "1:\tcbz %0, 2f\n\t" |
| 70 | "sub %0, %0, #1\n\t" |
| 71 | "b 1b\n" |
| 72 | "2:" |
| 73 | : "=&r" (delay) : "0" (delay) |
| 74 | ); |
| 75 | } |
| 76 | |
| 77 | /******************************************************************************* |
| 78 | * Perform any BL31 early platform setup. Here is an opportunity to copy |
| 79 | * parameters passed by the calling EL (S-EL1 in BL2 & EL3 in BL1) before |
| 80 | * they are lost (potentially). This needs to be done before the MMU is |
| 81 | * initialized so that the memory layout can be used while creating page |
| 82 | * tables. BL2 has flushed this information to memory, so we are guaranteed |
| 83 | * to pick up good data. |
| 84 | ******************************************************************************/ |
| 85 | void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1, |
| 86 | u_register_t arg2, u_register_t arg3) |
| 87 | |
| 88 | { |
| 89 | uint32_t div_reg; |
| 90 | |
| 91 | /* |
| 92 | * LOCAL_CONTROL: |
| 93 | * Bit 9 clear: Increment by 1 (vs. 2). |
| 94 | * Bit 8 clear: Timer source is 19.2MHz crystal (vs. APB). |
| 95 | */ |
| 96 | mmio_write_32(RPI4_LOCAL_CONTROL_BASE_ADDRESS, 0); |
| 97 | |
| 98 | /* LOCAL_PRESCALER; divide-by (0x80000000 / register_val) == 1 */ |
| 99 | mmio_write_32(RPI4_LOCAL_CONTROL_PRESCALER, 0x80000000); |
| 100 | |
| 101 | /* Early GPU firmware revisions need a little break here. */ |
| 102 | ldelay(100000); |
| 103 | |
| 104 | /* |
| 105 | * Initialize the console to provide early debug support. |
| 106 | * Different GPU firmware revisions set up the VPU divider differently, |
| 107 | * so read the actual divider register to learn the UART base clock |
| 108 | * rate. The divider is encoded as a 12.12 fixed point number, but we |
| 109 | * just care about the integer part of it. |
| 110 | */ |
| 111 | div_reg = mmio_read_32(RPI4_CLOCK_BASE + RPI4_VPU_CLOCK_DIVIDER); |
| 112 | div_reg = (div_reg >> 12) & 0xfff; |
| 113 | if (div_reg == 0) |
| 114 | div_reg = 1; |
| 115 | rpi3_console_init(PLAT_RPI4_VPU_CLK_RATE / div_reg); |
| 116 | |
| 117 | #if RPI3_DIRECT_LINUX_BOOT |
| 118 | bl33_image_ep_info.pc = plat_get_ns_image_entrypoint(); |
| 119 | bl33_image_ep_info.spsr = SPSR_64(MODE_EL2, MODE_SP_ELX, |
| 120 | DISABLE_ALL_EXCEPTIONS); |
| 121 | SET_SECURITY_STATE(bl33_image_ep_info.h.attr, NON_SECURE); |
| 122 | |
| 123 | # if RPI3_BL33_IN_AARCH32 |
| 124 | /* |
| 125 | * According to the file ``Documentation/arm/Booting`` of the Linux |
| 126 | * kernel tree, Linux expects: |
| 127 | * r0 = 0 |
| 128 | * r1 = machine type number, optional in DT-only platforms (~0 if so) |
| 129 | * r2 = Physical address of the device tree blob |
| 130 | */ |
| 131 | VERBOSE("rpi4: Preparing to boot 32-bit Linux kernel\n"); |
| 132 | bl33_image_ep_info.args.arg0 = 0U; |
| 133 | bl33_image_ep_info.args.arg1 = ~0U; |
| 134 | bl33_image_ep_info.args.arg2 = (u_register_t) RPI3_PRELOADED_DTB_BASE; |
| 135 | # else |
| 136 | /* |
| 137 | * According to the file ``Documentation/arm64/booting.txt`` of the |
| 138 | * Linux kernel tree, Linux expects the physical address of the device |
| 139 | * tree blob (DTB) in x0, while x1-x3 are reserved for future use and |
| 140 | * must be 0. |
| 141 | */ |
| 142 | VERBOSE("rpi4: Preparing to boot 64-bit Linux kernel\n"); |
| 143 | bl33_image_ep_info.args.arg0 = (u_register_t) RPI3_PRELOADED_DTB_BASE; |
| 144 | bl33_image_ep_info.args.arg1 = 0ULL; |
| 145 | bl33_image_ep_info.args.arg2 = 0ULL; |
| 146 | bl33_image_ep_info.args.arg3 = 0ULL; |
| 147 | # endif /* RPI3_BL33_IN_AARCH32 */ |
| 148 | #endif /* RPI3_DIRECT_LINUX_BOOT */ |
| 149 | } |
| 150 | |
| 151 | void bl31_plat_arch_setup(void) |
| 152 | { |
Andre Przywara | 2d8e99a | 2019-07-10 18:09:18 +0100 | [diff] [blame^] | 153 | /* |
| 154 | * Add the first page of memory, which holds the stub magic, |
| 155 | * the kernel and the DT address. |
| 156 | * This is read-only, as the GPU already populated the header, |
| 157 | * we just need to read it. |
| 158 | */ |
| 159 | mmap_add_region(0, 0, 4096, MT_MEMORY | MT_RO | MT_SECURE); |
| 160 | |
Andre Przywara | 6d471e1 | 2019-07-09 11:25:57 +0100 | [diff] [blame] | 161 | rpi3_setup_page_tables(BL31_BASE, BL31_END - BL31_BASE, |
| 162 | BL_CODE_BASE, BL_CODE_END, |
| 163 | BL_RO_DATA_BASE, BL_RO_DATA_END |
| 164 | #if USE_COHERENT_MEM |
| 165 | , BL_COHERENT_RAM_BASE, BL_COHERENT_RAM_END |
| 166 | #endif |
| 167 | ); |
| 168 | |
| 169 | enable_mmu_el3(0); |
| 170 | } |
| 171 | |
| 172 | void bl31_platform_setup(void) |
| 173 | { |
| 174 | /* Configure the interrupt controller */ |
| 175 | gicv2_driver_init(&rpi4_gic_data); |
| 176 | gicv2_distif_init(); |
| 177 | gicv2_pcpu_distif_init(); |
| 178 | gicv2_cpuif_enable(); |
| 179 | } |