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// SPDX-License-Identifier: GPL-2.0
/*
* Abrolhos Edge TPU ML accelerator firmware download support.
*
* Copyright (C) 2020 Google, Inc.
*/
#include <linux/dma-mapping.h>
#include <linux/gsa/gsa_tpu.h>
#include <linux/slab.h>
#include "abrolhos-platform.h"
#include "edgetpu-config.h"
#include "edgetpu-firmware.h"
#include "edgetpu-internal.h"
#include "edgetpu-kci.h"
#include "edgetpu-mailbox.h"
#include "mobile-firmware.h"
static int abrolhos_firmware_alloc_buffer(
struct edgetpu_firmware *et_fw,
struct edgetpu_firmware_buffer *fw_buf)
{
struct edgetpu_dev *etdev = et_fw->etdev;
struct abrolhos_platform_dev *abpdev = to_abrolhos_dev(etdev);
/* Allocate extra space the image header */
size_t buffer_size =
abpdev->fw_region_size + MOBILE_FW_HEADER_SIZE;
fw_buf->vaddr = vmalloc(buffer_size);
if (!fw_buf->vaddr) {
etdev_err(etdev, "%s: failed to allocate buffer (%zu bytes)\n",
__func__, buffer_size);
return -ENOMEM;
}
fw_buf->dma_addr = 0;
fw_buf->alloc_size = buffer_size;
fw_buf->used_size_align = 16;
return 0;
}
static void abrolhos_firmware_free_buffer(
struct edgetpu_firmware *et_fw,
struct edgetpu_firmware_buffer *fw_buf)
{
vfree(fw_buf->vaddr);
fw_buf->vaddr = NULL;
fw_buf->dma_addr = 0;
fw_buf->alloc_size = 0;
fw_buf->used_size_align = 0;
}
static int abrolhos_firmware_setup_buffer(
struct edgetpu_firmware *et_fw,
struct edgetpu_firmware_buffer *fw_buf)
{
return 0;
}
static void abrolhos_firmware_teardown_buffer(
struct edgetpu_firmware *et_fw,
struct edgetpu_firmware_buffer *fw_buf)
{
}
static int abrolhos_firmware_restart(struct edgetpu_firmware *et_fw,
bool force_reset)
{
struct edgetpu_dev *etdev = et_fw->etdev;
struct abrolhos_platform_dev *edgetpu_pdev = to_abrolhos_dev(etdev);
int tpu_state;
/* We are in a bad state, send shutdown command and hope the device recovers */
if (force_reset)
gsa_send_tpu_cmd(edgetpu_pdev->gsa_dev, GSA_TPU_SHUTDOWN);
tpu_state = gsa_send_tpu_cmd(edgetpu_pdev->gsa_dev, GSA_TPU_START);
if (tpu_state < 0) {
etdev_err(etdev, "GSA restart firmware failed: %d\n",
tpu_state);
return -EIO;
}
etdev_dbg(etdev, "Firmware restart successful\n");
return 0;
}
static int abrolhos_firmware_prepare_run(struct edgetpu_firmware *et_fw,
struct edgetpu_firmware_buffer *fw_buf)
{
struct edgetpu_dev *etdev = et_fw->etdev;
struct abrolhos_platform_dev *abpdev = to_abrolhos_dev(etdev);
void *image_vaddr, *header_vaddr;
struct mobile_image_config *image_config;
phys_addr_t image_start, image_end, carveout_start, carveout_end;
dma_addr_t header_dma_addr;
int ret, tpu_state;
if (fw_buf->used_size < MOBILE_FW_HEADER_SIZE) {
etdev_err(etdev, "Invalid buffer size: %zu < %d\n",
fw_buf->used_size, MOBILE_FW_HEADER_SIZE);
return -EINVAL;
}
tpu_state = gsa_send_tpu_cmd(abpdev->gsa_dev, GSA_TPU_GET_STATE);
if (tpu_state < GSA_TPU_STATE_INACTIVE) {
etdev_warn(etdev, "GSA failed to retrieve current status: %d\n",
tpu_state);
etdev_warn(etdev, "Assuming device is inactive\n");
tpu_state = GSA_TPU_STATE_INACTIVE;
}
etdev_dbg(etdev, "GSA Reports TPU state: %d\n", tpu_state);
if (tpu_state > GSA_TPU_STATE_INACTIVE) {
ret = gsa_unload_tpu_fw_image(abpdev->gsa_dev);
if (ret) {
etdev_warn(etdev, "GSA release failed: %d\n", ret);
return -EIO;
}
}
image_vaddr = memremap(abpdev->fw_region_paddr, abpdev->fw_region_size,
MEMREMAP_WC);
if (!image_vaddr) {
etdev_err(etdev, "memremap failed\n");
return -ENOMEM;
}
/* Skip the header */
memcpy(image_vaddr, fw_buf->vaddr + MOBILE_FW_HEADER_SIZE,
fw_buf->used_size - MOBILE_FW_HEADER_SIZE);
/* Allocate coherent memory for the image header */
header_vaddr = dma_alloc_coherent(abpdev->gsa_dev,
MOBILE_FW_HEADER_SIZE,
&header_dma_addr, GFP_KERNEL);
if (!header_vaddr) {
etdev_err(etdev,
"Failed to allocate coherent memory for header\n");
ret = -ENOMEM;
goto out_unmap;
}
memcpy(header_vaddr, fw_buf->vaddr, MOBILE_FW_HEADER_SIZE);
etdev_dbg(etdev,
"Requesting GSA image load. meta = %llX payload = %llX",
header_dma_addr, (u64)abpdev->fw_region_paddr);
ret = gsa_load_tpu_fw_image(abpdev->gsa_dev, header_dma_addr,
abpdev->fw_region_paddr);
if (ret) {
etdev_err(etdev, "GSA authentication failed: %d\n", ret);
ret = -EIO;
goto out_free_gsa;
}
/* fetch the firmware versions */
image_config = fw_buf->vaddr + MOBILE_IMAGE_CONFIG_OFFSET;
memcpy(&etdev->fw_version, &image_config->firmware_versions,
sizeof(etdev->fw_version));
/*
* GSA verifies the image config addresses and sizes are valid,
* so we don't perform overflow checks here.
*/
image_start = (phys_addr_t)image_config->carveout_base;
image_end = (phys_addr_t)(image_config->firmware_base +
image_config->firmware_size - 1);
carveout_start = abpdev->fw_region_paddr;
carveout_end = carveout_start + abpdev->fw_region_size - 1;
/* Image must fit within the carveout */
if (image_start < carveout_start || image_end > carveout_end) {
etdev_err(etdev, "Firmware image doesn't fit in carveout\n");
etdev_err(etdev, "Image config: %pap - %pap\n", &image_start,
&image_end);
etdev_err(etdev, "Carveout: %pap - %pap\n", &carveout_start,
&carveout_end);
ret = -ERANGE;
goto out_free_gsa;
}
/* Reset KCI mailbox before starting f/w, don't process anything old.*/
edgetpu_mailbox_reset(etdev->kci->mailbox);
tpu_state = gsa_send_tpu_cmd(abpdev->gsa_dev, GSA_TPU_START);
if (tpu_state < 0) {
etdev_err(etdev, "GSA start firmware failed: %d\n", tpu_state);
ret = -EIO;
}
out_free_gsa:
dma_free_coherent(abpdev->gsa_dev, MOBILE_FW_HEADER_SIZE,
header_vaddr, header_dma_addr);
out_unmap:
memunmap(image_vaddr);
return ret;
}
static const struct edgetpu_firmware_chip_data abrolhos_firmware_chip_data = {
.default_firmware_name = EDGETPU_DEFAULT_FIRMWARE_NAME,
.alloc_buffer = abrolhos_firmware_alloc_buffer,
.free_buffer = abrolhos_firmware_free_buffer,
.setup_buffer = abrolhos_firmware_setup_buffer,
.teardown_buffer = abrolhos_firmware_teardown_buffer,
.prepare_run = abrolhos_firmware_prepare_run,
.restart = abrolhos_firmware_restart,
};
int mobile_edgetpu_firmware_create(struct edgetpu_dev *etdev)
{
return edgetpu_firmware_create(etdev, &abrolhos_firmware_chip_data);
}
void mobile_edgetpu_firmware_destroy(struct edgetpu_dev *etdev)
{
edgetpu_firmware_destroy(etdev);
}
unsigned long edgetpu_chip_firmware_iova(struct edgetpu_dev *etdev)
{
/*
* There is no IOVA in Abrolhos, since firmware the IOMMU is
* bypassed and the only translation in effect is the one
* done by instruction remap registers
*/
return EDGETPU_INSTRUCTION_REMAP_BASE;
}
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