blob: 2fb4d3df15d258d8889fe8cf48b649a0b6ff6f92 [file] [log] [blame]
/*
* Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <inttypes.h>
#include <stdint.h>
#include <libfdt.h>
#include <platform_def.h>
#include <arch_helpers.h>
#include <common/bl_common.h>
#include <lib/mmio.h>
#include <lib/xlat_tables/xlat_mmu_helpers.h>
#include <lib/xlat_tables/xlat_tables_defs.h>
#include <lib/xlat_tables/xlat_tables_v2.h>
#include <plat/common/platform.h>
#include <common/fdt_fixup.h>
#include <common/fdt_wrappers.h>
#include <libfdt.h>
#include <drivers/arm/gicv2.h>
#include <rpi_shared.h>
/*
* Fields at the beginning of armstub8.bin.
* While building the BL31 image, we put the stub magic into the binary.
* The GPU firmware detects this at boot time, clears that field as a
* confirmation and puts the kernel and DT address in the following words.
*/
extern uint32_t stub_magic;
extern uint32_t dtb_ptr32;
extern uint32_t kernel_entry32;
static const gicv2_driver_data_t rpi4_gic_data = {
.gicd_base = RPI4_GIC_GICD_BASE,
.gicc_base = RPI4_GIC_GICC_BASE,
};
/*
* To be filled by the code below. At the moment BL32 is not supported.
* In the future these might be passed down from BL2.
*/
static entry_point_info_t bl32_image_ep_info;
static entry_point_info_t bl33_image_ep_info;
/*******************************************************************************
* Return a pointer to the 'entry_point_info' structure of the next image for
* the security state specified. BL33 corresponds to the non-secure image type
* while BL32 corresponds to the secure image type. A NULL pointer is returned
* if the image does not exist.
******************************************************************************/
entry_point_info_t *bl31_plat_get_next_image_ep_info(uint32_t type)
{
entry_point_info_t *next_image_info;
assert(sec_state_is_valid(type) != 0);
next_image_info = (type == NON_SECURE)
? &bl33_image_ep_info : &bl32_image_ep_info;
/* None of the images can have 0x0 as the entrypoint. */
if (next_image_info->pc) {
return next_image_info;
} else {
return NULL;
}
}
uintptr_t plat_get_ns_image_entrypoint(void)
{
#ifdef PRELOADED_BL33_BASE
return PRELOADED_BL33_BASE;
#else
/* Cleared by the GPU if kernel address is valid. */
if (stub_magic == 0)
return kernel_entry32;
WARN("Stub magic failure, using default kernel address 0x80000\n");
return 0x80000;
#endif
}
static uintptr_t rpi4_get_dtb_address(void)
{
#ifdef RPI3_PRELOADED_DTB_BASE
return RPI3_PRELOADED_DTB_BASE;
#else
/* Cleared by the GPU if DTB address is valid. */
if (stub_magic == 0)
return dtb_ptr32;
WARN("Stub magic failure, DTB address unknown\n");
return 0;
#endif
}
static void ldelay(register_t delay)
{
__asm__ volatile (
"1:\tcbz %0, 2f\n\t"
"sub %0, %0, #1\n\t"
"b 1b\n"
"2:"
: "=&r" (delay) : "0" (delay)
);
}
/*******************************************************************************
* Perform any BL31 early platform setup. Here is an opportunity to copy
* parameters passed by the calling EL (S-EL1 in BL2 & EL3 in BL1) before
* they are lost (potentially). This needs to be done before the MMU is
* initialized so that the memory layout can be used while creating page
* tables. BL2 has flushed this information to memory, so we are guaranteed
* to pick up good data.
******************************************************************************/
void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1,
u_register_t arg2, u_register_t arg3)
{
/*
* LOCAL_CONTROL:
* Bit 9 clear: Increment by 1 (vs. 2).
* Bit 8 clear: Timer source is 19.2MHz crystal (vs. APB).
*/
mmio_write_32(RPI4_LOCAL_CONTROL_BASE_ADDRESS, 0);
/* LOCAL_PRESCALER; divide-by (0x80000000 / register_val) == 1 */
mmio_write_32(RPI4_LOCAL_CONTROL_PRESCALER, 0x80000000);
/* Early GPU firmware revisions need a little break here. */
ldelay(100000);
/* Initialize the console to provide early debug support. */
rpi3_console_init();
bl33_image_ep_info.pc = plat_get_ns_image_entrypoint();
bl33_image_ep_info.spsr = rpi3_get_spsr_for_bl33_entry();
SET_SECURITY_STATE(bl33_image_ep_info.h.attr, NON_SECURE);
#if RPI3_DIRECT_LINUX_BOOT
# if RPI3_BL33_IN_AARCH32
/*
* According to the file ``Documentation/arm/Booting`` of the Linux
* kernel tree, Linux expects:
* r0 = 0
* r1 = machine type number, optional in DT-only platforms (~0 if so)
* r2 = Physical address of the device tree blob
*/
VERBOSE("rpi4: Preparing to boot 32-bit Linux kernel\n");
bl33_image_ep_info.args.arg0 = 0U;
bl33_image_ep_info.args.arg1 = ~0U;
bl33_image_ep_info.args.arg2 = rpi4_get_dtb_address();
# else
/*
* According to the file ``Documentation/arm64/booting.txt`` of the
* Linux kernel tree, Linux expects the physical address of the device
* tree blob (DTB) in x0, while x1-x3 are reserved for future use and
* must be 0.
*/
VERBOSE("rpi4: Preparing to boot 64-bit Linux kernel\n");
bl33_image_ep_info.args.arg0 = rpi4_get_dtb_address();
bl33_image_ep_info.args.arg1 = 0ULL;
bl33_image_ep_info.args.arg2 = 0ULL;
bl33_image_ep_info.args.arg3 = 0ULL;
# endif /* RPI3_BL33_IN_AARCH32 */
#endif /* RPI3_DIRECT_LINUX_BOOT */
}
void bl31_plat_arch_setup(void)
{
/*
* Is the dtb_ptr32 pointer valid? If yes, map the DTB region.
* We map the 2MB region the DTB start address lives in, plus
* the next 2MB, to have enough room for expansion.
*/
if (stub_magic == 0) {
unsigned long long dtb_region = dtb_ptr32;
dtb_region &= ~0x1fffff; /* Align to 2 MB. */
mmap_add_region(dtb_region, dtb_region, 4U << 20,
MT_MEMORY | MT_RW | MT_NS);
}
/*
* Add the first page of memory, which holds the stub magic,
* the kernel and the DT address.
* This also holds the secondary CPU's entrypoints and mailboxes.
*/
mmap_add_region(0, 0, 4096, MT_NON_CACHEABLE | MT_RW | MT_SECURE);
rpi3_setup_page_tables(BL31_BASE, BL31_END - BL31_BASE,
BL_CODE_BASE, BL_CODE_END,
BL_RO_DATA_BASE, BL_RO_DATA_END
#if USE_COHERENT_MEM
, BL_COHERENT_RAM_BASE, BL_COHERENT_RAM_END
#endif
);
enable_mmu_el3(0);
}
/*
* Remove the FDT /memreserve/ entry that covers the region at the very
* beginning of memory (if that exists). This is where the secondaries
* originally spin, but we pull them out there.
* Having overlapping /reserved-memory and /memreserve/ regions confuses
* the Linux kernel, so we need to get rid of this one.
*/
static void remove_spintable_memreserve(void *dtb)
{
uint64_t addr, size;
int regions = fdt_num_mem_rsv(dtb);
int i;
for (i = 0; i < regions; i++) {
if (fdt_get_mem_rsv(dtb, i, &addr, &size) != 0) {
return;
}
if (size == 0U) {
return;
}
/* We only look for the region at the beginning of DRAM. */
if (addr != 0U) {
continue;
}
/*
* Currently the region in the existing DTs is exactly 4K
* in size. Should this value ever change, there is probably
* a reason for that, so inform the user about this.
*/
if (size == 4096U) {
fdt_del_mem_rsv(dtb, i);
return;
}
WARN("Keeping unknown /memreserve/ region at 0, size: %" PRId64 "\n",
size);
}
}
static void rpi4_prepare_dtb(void)
{
void *dtb = (void *)rpi4_get_dtb_address();
uint32_t gic_int_prop[3];
int ret, offs;
/* Return if no device tree is detected */
if (fdt_check_header(dtb) != 0)
return;
ret = fdt_open_into(dtb, dtb, 0x100000);
if (ret < 0) {
ERROR("Invalid Device Tree at %p: error %d\n", dtb, ret);
return;
}
if (dt_add_psci_node(dtb)) {
ERROR("Failed to add PSCI Device Tree node\n");
return;
}
if (dt_add_psci_cpu_enable_methods(dtb)) {
ERROR("Failed to add PSCI cpu enable methods in Device Tree\n");
return;
}
/*
* Remove the original reserved region (used for the spintable), and
* replace it with a region describing the whole of Trusted Firmware.
*/
remove_spintable_memreserve(dtb);
if (fdt_add_reserved_memory(dtb, "atf@0", 0, 0x80000))
WARN("Failed to add reserved memory nodes to DT.\n");
offs = fdt_node_offset_by_compatible(dtb, 0, "arm,gic-400");
gic_int_prop[0] = cpu_to_fdt32(1); // PPI
gic_int_prop[1] = cpu_to_fdt32(9); // PPI #9
gic_int_prop[2] = cpu_to_fdt32(0x0f04); // all cores, level high
fdt_setprop(dtb, offs, "interrupts", gic_int_prop, 12);
offs = fdt_path_offset(dtb, "/chosen");
fdt_setprop_string(dtb, offs, "stdout-path", "serial0");
ret = fdt_pack(dtb);
if (ret < 0)
ERROR("Failed to pack Device Tree at %p: error %d\n", dtb, ret);
clean_dcache_range((uintptr_t)dtb, fdt_blob_size(dtb));
INFO("Changed device tree to advertise PSCI.\n");
}
void bl31_platform_setup(void)
{
rpi4_prepare_dtb();
/* Configure the interrupt controller */
gicv2_driver_init(&rpi4_gic_data);
gicv2_distif_init();
gicv2_pcpu_distif_init();
gicv2_cpuif_enable();
}