refactor(rpi): move more platform-specific code into common
In preparation for RPi 5 support, which will reuse most of the RPi 4
logic except for DTB patching.
Change-Id: I6f6ef96933711a1798757a3389adae1b8ee3de6c
Signed-off-by: Mario Bălănică <mariobalanica02@gmail.com>
diff --git a/plat/rpi/common/rpi4_bl31_setup.c b/plat/rpi/common/rpi4_bl31_setup.c
new file mode 100644
index 0000000..a7228fd
--- /dev/null
+++ b/plat/rpi/common/rpi4_bl31_setup.c
@@ -0,0 +1,209 @@
+/*
+ * Copyright (c) 2015-2024, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <inttypes.h>
+#include <stdint.h>
+
+#include <arch_helpers.h>
+#include <common/bl_common.h>
+#include <drivers/arm/gicv2.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 <platform_def.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
+}
+
+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("rpi: 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("rpi: 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);
+}
+
+void bl31_platform_setup(void)
+{
+ /* Configure the interrupt controller */
+ gicv2_driver_init(&rpi4_gic_data);
+ gicv2_distif_init();
+ gicv2_pcpu_distif_init();
+ gicv2_cpuif_enable();
+
+ plat_rpi_bl31_custom_setup();
+}