From: Arto Merilainen <amerilainen@xxxxxxxxxx>
Add a set of falcon helper routines for use by the tegradrm client drivers
of the various falcon-based engines.
The falcon is a microcontroller that acts as a frontend for the rest of a
particular Tegra engine. In order to properly utilize these engines, the
frontend must be booted before pushing any commands.
Based on work by Andrew Chew <achew@xxxxxxxxxx>
Signed-off-by: Andrew Chew <achew@xxxxxxxxxx>
Signed-off-by: Arto Merilainen <amerilainen@xxxxxxxxxx>
Signed-off-by: Mikko Perttunen <mperttunen@xxxxxxxxxx>
---
drivers/gpu/drm/tegra/Makefile | 3 +-
drivers/gpu/drm/tegra/falcon.c | 259 +++++++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/tegra/falcon.h | 127 ++++++++++++++++++++
3 files changed, 388 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/tegra/falcon.c
create mode 100644 drivers/gpu/drm/tegra/falcon.h
diff --git a/drivers/gpu/drm/tegra/Makefile b/drivers/gpu/drm/tegra/Makefile
index 2c66a8d..93e9a4a 100644
--- a/drivers/gpu/drm/tegra/Makefile
+++ b/drivers/gpu/drm/tegra/Makefile
@@ -13,6 +13,7 @@ tegra-drm-y := \
sor.o \
dpaux.o \
gr2d.o \
- gr3d.o
+ gr3d.o \
+ falcon.o
obj-$(CONFIG_DRM_TEGRA) += tegra-drm.o
diff --git a/drivers/gpu/drm/tegra/falcon.c b/drivers/gpu/drm/tegra/falcon.c
new file mode 100644
index 0000000..f685e729
--- /dev/null
+++ b/drivers/gpu/drm/tegra/falcon.c
@@ -0,0 +1,259 @@
+/*
+ * 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 (!falcon->firmware.vaddr) {
+ dev_err(falcon->dev, "dma memory mapping failed\n");
+ return -ENOMEM;
+ }
+
+ /* 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;
+ int err;
+
+ if (!falcon->firmware.vaddr)
+ return -EINVAL;
+
+ 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);
+}
diff --git a/drivers/gpu/drm/tegra/falcon.h b/drivers/gpu/drm/tegra/falcon.h
new file mode 100644
index 0000000..4504ed5
--- /dev/null
+++ b/drivers/gpu/drm/tegra/falcon.h
@@ -0,0 +1,127 @@
+/*
+ * 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.
+ */
+
+#ifndef _FALCON_H_
+#define _FALCON_H_
+
+#include <linux/types.h>
+
+#define FALCON_UCLASS_METHOD_OFFSET 0x00000040
+
+#define FALCON_UCLASS_METHOD_DATA 0x00000044
+
+#define FALCON_IRQMSET 0x00001010
+#define FALCON_IRQMSET_WDTMR (1 << 1)
+#define FALCON_IRQMSET_HALT (1 << 4)
+#define FALCON_IRQMSET_EXTERR (1 << 5)
+#define FALCON_IRQMSET_SWGEN0 (1 << 6)
+#define FALCON_IRQMSET_SWGEN1 (1 << 7)
+#define FALCON_IRQMSET_EXT(v) (((v) & 0xff) << 8)
+
+#define FALCON_IRQDEST 0x0000101c
+#define FALCON_IRQDEST_HALT (1 << 4)
+#define FALCON_IRQDEST_EXTERR (1 << 5)
+#define FALCON_IRQDEST_SWGEN0 (1 << 6)
+#define FALCON_IRQDEST_SWGEN1 (1 << 7)
+#define FALCON_IRQDEST_EXT(v) (((v) & 0xff) << 8)
+
+#define FALCON_ITFEN 0x00001048
+#define FALCON_ITFEN_CTXEN (1 << 0)
+#define FALCON_ITFEN_MTHDEN (1 << 1)
+
+#define FALCON_IDLESTATE 0x0000104c
+
+#define FALCON_CPUCTL 0x00001100
+#define FALCON_CPUCTL_STARTCPU (1 << 1)
+
+#define FALCON_BOOTVEC 0x00001104
+
+#define FALCON_DMACTL 0x0000110c
+#define FALCON_DMACTL_DMEM_SCRUBBING (1 << 1)
+#define FALCON_DMACTL_IMEM_SCRUBBING (1 << 2)
+
+#define FALCON_DMATRFBASE 0x00001110
+
+#define FALCON_DMATRFMOFFS 0x00001114
+
+#define FALCON_DMATRFCMD 0x00001118
+#define FALCON_DMATRFCMD_IDLE (1 << 1)
+#define FALCON_DMATRFCMD_IMEM (1 << 4)
+#define FALCON_DMATRFCMD_SIZE_256B (6 << 8)
+
+#define FALCON_DMATRFFBOFFS 0x0000111c
+
+struct falcon_fw_bin_header_v1 {
+ u32 magic; /* 0x10de */
+ u32 version; /* version of bin format (1) */
+ u32 size; /* entire image size including this header */
+ u32 os_header_offset;
+ u32 os_data_offset;
+ u32 os_size;
+};
+
+struct falcon_fw_os_app_v1 {
+ u32 offset;
+ u32 size;
+};
+
+struct falcon_fw_os_header_v1 {
+ u32 code_offset;
+ u32 code_size;
+ u32 data_offset;
+ u32 data_size;
+};
+
+struct falcon;
+
+struct falcon_ops {
+ void *(*alloc)(struct falcon *falcon, size_t size,
+ dma_addr_t *paddr);
+ void (*free)(struct falcon *falcon, size_t size,
+ dma_addr_t paddr, void *vaddr);
+};
+
+struct falcon_firmware_section {
+ unsigned long offset;
+ size_t size;
+};
+
+struct falcon_firmware {
+ /* Firmware after it is read but not loaded */
+ const struct firmware *firmware;
+
+ /* Raw firmware data */
+ dma_addr_t paddr;
+ void *vaddr;
+ size_t size;
+
+ /* Parsed firmware information */
+ struct falcon_firmware_section bin_data;
+ struct falcon_firmware_section data;
+ struct falcon_firmware_section code;
+};
+
+struct falcon {
+ /* Set by falcon client */
+ struct device *dev;
+ void __iomem *regs;
+ const struct falcon_ops *ops;
+ void *data;
+
+ struct falcon_firmware firmware;
+};
+
+int falcon_init(struct falcon *falcon);
+void falcon_exit(struct falcon *falcon);
+int falcon_read_firmware(struct falcon *falcon, const char *firmware_name);
+int falcon_load_firmware(struct falcon *falcon);
+int falcon_boot(struct falcon *falcon);
+void falcon_execute_method(struct falcon *falcon, u32 method, u32 data);
+int falcon_wait_idle(struct falcon *falcon);
+
+#endif /* _FALCON_H_ */
--
2.10.2
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