diff options
| -rw-r--r-- | plat/rpi3/platform.mk | 3 | ||||
| -rw-r--r-- | plat/rpi3/rpi3_bl1_setup.c | 34 | ||||
| -rw-r--r-- | plat/rpi3/rpi3_hw.h | 21 | ||||
| -rw-r--r-- | plat/rpi3/rpi3_mbox.c | 146 | ||||
| -rw-r--r-- | plat/rpi3/rpi3_private.h | 3 |
5 files changed, 206 insertions, 1 deletions
diff --git a/plat/rpi3/platform.mk b/plat/rpi3/platform.mk index fa7e5eb7..5990f275 100644 --- a/plat/rpi3/platform.mk +++ b/plat/rpi3/platform.mk @@ -20,7 +20,8 @@ BL1_SOURCES += drivers/io/io_fip.c \ plat/common/aarch64/platform_mp_stack.S \ plat/rpi3/aarch64/plat_helpers.S \ plat/rpi3/rpi3_bl1_setup.c \ - plat/rpi3/rpi3_io_storage.c + plat/rpi3/rpi3_io_storage.c \ + plat/rpi3/rpi3_mbox.c BL2_SOURCES += common/desc_image_load.c \ drivers/io/io_fip.c \ diff --git a/plat/rpi3/rpi3_bl1_setup.c b/plat/rpi3/rpi3_bl1_setup.c index c98715b9..39bb3325 100644 --- a/plat/rpi3/rpi3_bl1_setup.c +++ b/plat/rpi3/rpi3_bl1_setup.c @@ -7,6 +7,7 @@ #include <arch.h> #include <arch_helpers.h> #include <bl_common.h> +#include <debug.h> #include <platform_def.h> #include <xlat_mmu_helpers.h> #include <xlat_tables_defs.h> @@ -56,6 +57,39 @@ void bl1_plat_arch_setup(void) void bl1_platform_setup(void) { + uint32_t __unused rev; + int __unused rc; + + rc = rpi3_vc_hardware_get_board_revision(&rev); + + if (rc == 0) { + const char __unused *model, __unused *info; + + switch (rev) { + case 0xA02082: + model = "Raspberry Pi 3 Model B"; + info = "(1GB, Sony, UK)"; + break; + case 0xA22082: + model = "Raspberry Pi 3 Model B"; + info = "(1GB, Embest, China)"; + break; + case 0xA020D3: + model = "Raspberry Pi 3 Model B+"; + info = "(1GB, Sony, UK)"; + break; + default: + model = "Unknown"; + info = "(Unknown)"; + ERROR("rpi3: Unknown board revision 0x%08x\n", rev); + break; + } + + NOTICE("rpi3: Detected: %s %s [0x%08x]\n", model, info, rev); + } else { + ERROR("rpi3: Unable to detect board revision\n"); + } + /* Initialise the IO layer and register platform IO devices */ plat_rpi3_io_setup(); } diff --git a/plat/rpi3/rpi3_hw.h b/plat/rpi3/rpi3_hw.h index f411acbc..a83a0ad1 100644 --- a/plat/rpi3/rpi3_hw.h +++ b/plat/rpi3/rpi3_hw.h @@ -17,6 +17,27 @@ #define RPI3_IO_SIZE ULL(0x01000000) /* + * ARM <-> VideoCore mailboxes + */ +#define RPI3_MBOX_OFFSET ULL(0x0000B880) +#define RPI3_MBOX_BASE (RPI3_IO_BASE + RPI3_MBOX_OFFSET) +/* VideoCore -> ARM */ +#define RPI3_MBOX0_READ_OFFSET ULL(0x00000000) +#define RPI3_MBOX0_PEEK_OFFSET ULL(0x00000010) +#define RPI3_MBOX0_SENDER_OFFSET ULL(0x00000014) +#define RPI3_MBOX0_STATUS_OFFSET ULL(0x00000018) +#define RPI3_MBOX0_CONFIG_OFFSET ULL(0x0000001C) +/* ARM -> VideoCore */ +#define RPI3_MBOX1_WRITE_OFFSET ULL(0x00000020) +#define RPI3_MBOX1_PEEK_OFFSET ULL(0x00000030) +#define RPI3_MBOX1_SENDER_OFFSET ULL(0x00000034) +#define RPI3_MBOX1_STATUS_OFFSET ULL(0x00000038) +#define RPI3_MBOX1_CONFIG_OFFSET ULL(0x0000003C) +/* Mailbox status constants */ +#define RPI3_MBOX_STATUS_FULL_MASK U(0x80000000) /* Set if full */ +#define RPI3_MBOX_STATUS_EMPTY_MASK U(0x40000000) /* Set if empty */ + +/* * Power management, reset controller, watchdog. */ #define RPI3_IO_PM_OFFSET ULL(0x00100000) diff --git a/plat/rpi3/rpi3_mbox.c b/plat/rpi3/rpi3_mbox.c new file mode 100644 index 00000000..77e17af6 --- /dev/null +++ b/plat/rpi3/rpi3_mbox.c @@ -0,0 +1,146 @@ +/* + * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <assert.h> +#include <arch_helpers.h> +#include <debug.h> +#include <mmio.h> +#include <platform_def.h> + +#include "rpi3_hw.h" + +/* This struct must be aligned to 16 bytes */ +typedef struct __packed __aligned(16) rpi3_mbox_request { + uint32_t size; /* Buffer size in bytes */ + uint32_t code; /* Request/response code */ + uint32_t tags[0]; +} rpi3_mbox_request_t; + +#define RPI3_MBOX_BUFFER_SIZE U(256) +static uint8_t __aligned(16) rpi3_mbox_buffer[RPI3_MBOX_BUFFER_SIZE]; + +/* Constants to perform a request/check the status of a request. */ +#define RPI3_MBOX_PROCESS_REQUEST U(0x00000000) +#define RPI3_MBOX_REQUEST_SUCCESSFUL U(0x80000000) +#define RPI3_MBOX_REQUEST_ERROR U(0x80000001) + +/* Command constants */ +#define RPI3_TAG_HARDWARE_GET_BOARD_REVISION U(0x00010002) +#define RPI3_TAG_END U(0x00000000) + +#define RPI3_TAG_REQUEST U(0x00000000) +#define RPI3_TAG_IS_RESPONSE U(0x80000000) /* Set if response */ +#define RPI3_TAG_RESPONSE_LENGTH_MASK U(0x7FFFFFFF) + +#define RPI3_CHANNEL_ARM_TO_VC U(0x8) +#define RPI3_CHANNEL_MASK U(0xF) + +#define RPI3_MAILBOX_MAX_RETRIES U(1000000) + +/******************************************************************************* + * Helpers to send requests to the VideoCore using the mailboxes. + ******************************************************************************/ +static void rpi3_vc_mailbox_request_send(void) +{ + uint32_t st, data; + uintptr_t resp_addr, addr; + unsigned int retries; + + /* This is the location of the request buffer */ + addr = (uintptr_t) &rpi3_mbox_buffer; + + /* Make sure that the changes are seen by the VideoCore */ + flush_dcache_range(addr, RPI3_MBOX_BUFFER_SIZE); + + /* Wait until the outbound mailbox is empty */ + retries = 0U; + + do { + st = mmio_read_32(RPI3_MBOX_BASE + RPI3_MBOX1_STATUS_OFFSET); + + retries++; + if (retries == RPI3_MAILBOX_MAX_RETRIES) { + ERROR("rpi3: mbox: Send request timeout\n"); + return; + } + + } while ((st & RPI3_MBOX_STATUS_EMPTY_MASK) == 0U); + + /* Send base address of this message to start request */ + mmio_write_32(RPI3_MBOX_BASE + RPI3_MBOX1_WRITE_OFFSET, + RPI3_CHANNEL_ARM_TO_VC | (uint32_t) addr); + + /* Wait until the inbound mailbox isn't empty */ + retries = 0U; + + do { + st = mmio_read_32(RPI3_MBOX_BASE + RPI3_MBOX0_STATUS_OFFSET); + + retries++; + if (retries == RPI3_MAILBOX_MAX_RETRIES) { + ERROR("rpi3: mbox: Receive response timeout\n"); + return; + } + + } while ((st & RPI3_MBOX_STATUS_EMPTY_MASK) != 0U); + + /* Get location and channel */ + data = mmio_read_32(RPI3_MBOX_BASE + RPI3_MBOX0_READ_OFFSET); + + if ((data & RPI3_CHANNEL_MASK) != RPI3_CHANNEL_ARM_TO_VC) { + ERROR("rpi3: mbox: Wrong channel: 0x%08x\n", data); + panic(); + } + + resp_addr = (uintptr_t)(data & ~RPI3_CHANNEL_MASK); + if (addr != resp_addr) { + ERROR("rpi3: mbox: Unexpected address: 0x%08x\n", data); + panic(); + } + + /* Make sure that the data seen by the CPU is up to date */ + inv_dcache_range(addr, RPI3_MBOX_BUFFER_SIZE); +} + +/******************************************************************************* + * Request board revision. Returns the revision and 0 on success, -1 on error. + ******************************************************************************/ +int rpi3_vc_hardware_get_board_revision(uint32_t *revision) +{ + uint32_t tag_request_size = sizeof(uint32_t); + rpi3_mbox_request_t *req = (rpi3_mbox_request_t *) rpi3_mbox_buffer; + + assert(revision != NULL); + + VERBOSE("rpi3: mbox: Sending request at %p\n", (void *)req); + + req->size = sizeof(rpi3_mbox_buffer); + req->code = RPI3_MBOX_PROCESS_REQUEST; + + req->tags[0] = RPI3_TAG_HARDWARE_GET_BOARD_REVISION; + req->tags[1] = tag_request_size; /* Space available for the response */ + req->tags[2] = RPI3_TAG_REQUEST; + req->tags[3] = 0; /* Placeholder for the response */ + + req->tags[4] = RPI3_TAG_END; + + rpi3_vc_mailbox_request_send(); + + if (req->code != RPI3_MBOX_REQUEST_SUCCESSFUL) { + ERROR("rpi3: mbox: Code = 0x%08x\n", req->code); + return -1; + } + + if (req->tags[2] != (RPI3_TAG_IS_RESPONSE | tag_request_size)) { + ERROR("rpi3: mbox: get board revision failed (0x%08x)\n", + req->tags[2]); + return -1; + } + + *revision = req->tags[3]; + + return 0; +} diff --git a/plat/rpi3/rpi3_private.h b/plat/rpi3/rpi3_private.h index a9fbfe47..9d1744e3 100644 --- a/plat/rpi3/rpi3_private.h +++ b/plat/rpi3/rpi3_private.h @@ -33,4 +33,7 @@ uint32_t rpi3_get_spsr_for_bl33_entry(void); /* IO storage utility functions */ void plat_rpi3_io_setup(void); +/* VideoCore firmware commands */ +int rpi3_vc_hardware_get_board_revision(uint32_t *revision); + #endif /*__RPI3_PRIVATE_H__ */ |