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/*
* Copyright (c) 2015, NVIDIA Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/firmware.h>
#include <linux/pci_ids.h>
#include <linux/iopoll.h>
#include "falcon.h"
#include "drm.h"
enum falcon_memory {
FALCON_MEMORY_IMEM,
FALCON_MEMORY_DATA,
};
static void falcon_writel(struct falcon *falcon, u32 value, u32 offset)
{
writel(value, falcon->regs + offset);
}
int falcon_wait_idle(struct falcon *falcon)
{
u32 value;
return readl_poll_timeout(falcon->regs + FALCON_IDLESTATE, value,
(value == 0), 10, 100000);
}
static int falcon_dma_wait_idle(struct falcon *falcon)
{
u32 value;
return readl_poll_timeout(falcon->regs + FALCON_DMATRFCMD, value,
(value & FALCON_DMATRFCMD_IDLE), 10, 100000);
}
static int falcon_copy_chunk(struct falcon *falcon,
phys_addr_t base,
unsigned long offset,
enum falcon_memory target)
{
u32 cmd = FALCON_DMATRFCMD_SIZE_256B;
if (target == FALCON_MEMORY_IMEM)
cmd |= FALCON_DMATRFCMD_IMEM;
falcon_writel(falcon, offset, FALCON_DMATRFMOFFS);
falcon_writel(falcon, base, FALCON_DMATRFFBOFFS);
falcon_writel(falcon, cmd, FALCON_DMATRFCMD);
return falcon_dma_wait_idle(falcon);
}
static void falcon_copy_firmware_image(struct falcon *falcon,
const struct firmware *firmware)
{
u32 *firmware_vaddr = falcon->firmware.vaddr;
dma_addr_t daddr;
size_t i;
int err;
/* copy the whole thing taking into account endianness */
for (i = 0; i < firmware->size / sizeof(u32); i++)
firmware_vaddr[i] = le32_to_cpu(((u32 *)firmware->data)[i]);
/* ensure that caches are flushed and falcon can see the firmware */
daddr = dma_map_single(falcon->dev, firmware_vaddr,
falcon->firmware.size, DMA_TO_DEVICE);
err = dma_mapping_error(falcon->dev, daddr);
if (err) {
dev_err(falcon->dev, "failed to map firmware: %d\n", err);
return;
}
dma_sync_single_for_device(falcon->dev, daddr,
falcon->firmware.size, DMA_TO_DEVICE);
dma_unmap_single(falcon->dev, daddr, falcon->firmware.size,
DMA_TO_DEVICE);
}
static int falcon_parse_firmware_image(struct falcon *falcon)
{
struct falcon_fw_bin_header_v1 *bin = (void *)falcon->firmware.vaddr;
struct falcon_fw_os_header_v1 *os;
/* endian problems would show up right here */
if (bin->magic != PCI_VENDOR_ID_NVIDIA) {
dev_err(falcon->dev, "incorrect firmware magic\n");
return -EINVAL;
}
/* currently only version 1 is supported */
if (bin->version != 1) {
dev_err(falcon->dev, "unsupported firmware version\n");
return -EINVAL;
}
/* check that the firmware size is consistent */
if (bin->size > falcon->firmware.size) {
dev_err(falcon->dev, "firmware image size inconsistency\n");
return -EINVAL;
}
os = falcon->firmware.vaddr + bin->os_header_offset;
falcon->firmware.bin_data.size = bin->os_size;
falcon->firmware.bin_data.offset = bin->os_data_offset;
falcon->firmware.code.offset = os->code_offset;
falcon->firmware.code.size = os->code_size;
falcon->firmware.data.offset = os->data_offset;
falcon->firmware.data.size = os->data_size;
return 0;
}
int falcon_read_firmware(struct falcon *falcon, const char *name)
{
int err;
/* request_firmware prints error if it fails */
err = request_firmware(&falcon->firmware.firmware, name, falcon->dev);
if (err < 0)
return err;
return 0;
}
int falcon_load_firmware(struct falcon *falcon)
{
const struct firmware *firmware = falcon->firmware.firmware;
int err;
falcon->firmware.size = firmware->size;
/* allocate iova space for the firmware */
falcon->firmware.vaddr = falcon->ops->alloc(falcon, firmware->size,
&falcon->firmware.paddr);
if (IS_ERR(falcon->firmware.vaddr)) {
dev_err(falcon->dev, "DMA memory mapping failed\n");
return PTR_ERR(falcon->firmware.vaddr);
}
/* copy firmware image into local area. this also ensures endianness */
falcon_copy_firmware_image(falcon, firmware);
/* parse the image data */
err = falcon_parse_firmware_image(falcon);
if (err < 0) {
dev_err(falcon->dev, "failed to parse firmware image\n");
goto err_setup_firmware_image;
}
release_firmware(firmware);
falcon->firmware.firmware = NULL;
return 0;
err_setup_firmware_image:
falcon->ops->free(falcon, falcon->firmware.size,
falcon->firmware.paddr, falcon->firmware.vaddr);
return err;
}
int falcon_init(struct falcon *falcon)
{
/* check mandatory ops */
if (!falcon->ops || !falcon->ops->alloc || !falcon->ops->free)
return -EINVAL;
falcon->firmware.vaddr = NULL;
return 0;
}
void falcon_exit(struct falcon *falcon)
{
if (falcon->firmware.firmware) {
release_firmware(falcon->firmware.firmware);
falcon->firmware.firmware = NULL;
}
if (falcon->firmware.vaddr) {
falcon->ops->free(falcon, falcon->firmware.size,
falcon->firmware.paddr,
falcon->firmware.vaddr);
falcon->firmware.vaddr = NULL;
}
}
int falcon_boot(struct falcon *falcon)
{
unsigned long offset;
u32 value;
int err;
if (!falcon->firmware.vaddr)
return -EINVAL;
err = readl_poll_timeout(falcon->regs + FALCON_DMACTL, value,
(value & (FALCON_DMACTL_IMEM_SCRUBBING |
FALCON_DMACTL_DMEM_SCRUBBING)) == 0,
10, 10000);
if (err < 0)
return err;
falcon_writel(falcon, 0, FALCON_DMACTL);
/* setup the address of the binary data so Falcon can access it later */
falcon_writel(falcon, (falcon->firmware.paddr +
falcon->firmware.bin_data.offset) >> 8,
FALCON_DMATRFBASE);
/* copy the data segment into Falcon internal memory */
for (offset = 0; offset < falcon->firmware.data.size; offset += 256)
falcon_copy_chunk(falcon,
falcon->firmware.data.offset + offset,
offset, FALCON_MEMORY_DATA);
/* copy the first code segment into Falcon internal memory */
falcon_copy_chunk(falcon, falcon->firmware.code.offset,
0, FALCON_MEMORY_IMEM);
/* setup falcon interrupts */
falcon_writel(falcon, FALCON_IRQMSET_EXT(0xff) |
FALCON_IRQMSET_SWGEN1 |
FALCON_IRQMSET_SWGEN0 |
FALCON_IRQMSET_EXTERR |
FALCON_IRQMSET_HALT |
FALCON_IRQMSET_WDTMR,
FALCON_IRQMSET);
falcon_writel(falcon, FALCON_IRQDEST_EXT(0xff) |
FALCON_IRQDEST_SWGEN1 |
FALCON_IRQDEST_SWGEN0 |
FALCON_IRQDEST_EXTERR |
FALCON_IRQDEST_HALT,
FALCON_IRQDEST);
/* enable interface */
falcon_writel(falcon, FALCON_ITFEN_MTHDEN |
FALCON_ITFEN_CTXEN,
FALCON_ITFEN);
/* boot falcon */
falcon_writel(falcon, 0x00000000, FALCON_BOOTVEC);
falcon_writel(falcon, FALCON_CPUCTL_STARTCPU, FALCON_CPUCTL);
err = falcon_wait_idle(falcon);
if (err < 0) {
dev_err(falcon->dev, "Falcon boot failed due to timeout\n");
return err;
}
return 0;
}
void falcon_execute_method(struct falcon *falcon, u32 method, u32 data)
{
falcon_writel(falcon, method >> 2, FALCON_UCLASS_METHOD_OFFSET);
falcon_writel(falcon, data, FALCON_UCLASS_METHOD_DATA);
}
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