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Subject[PATCHv1 2/2] fpga-mgr: add streaming support
Date
From: Yi Li <yi1.li@linux.intel.com>

Add fpga_mgr_firmware_stream API to enable streaming/programing
FPGA bitstream file from file system to FPGA manager. This code is
on top of Luis R. Rodriguez's new driver_data_request_sync API.

Signed-off-by: Yi Li <yi1.li@linux.intel.com>
---
drivers/fpga/fpga-mgr.c | 96 +++++++++++++++++++++++++++++++++++++++++++
include/linux/fpga/fpga-mgr.h | 4 ++
2 files changed, 100 insertions(+)

diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c
index 188ffef..975194c 100644
--- a/drivers/fpga/fpga-mgr.c
+++ b/drivers/fpga/fpga-mgr.c
@@ -27,6 +27,8 @@
#include <linux/slab.h>
#include <linux/scatterlist.h>
#include <linux/highmem.h>
+#include <linux/sizes.h>
+#include <linux/driver_data.h>

static DEFINE_IDA(fpga_mgr_ida);
static struct class *fpga_mgr_class;
@@ -196,6 +198,100 @@ static int fpga_mgr_buf_load_mapped(struct fpga_manager *mgr,
return fpga_mgr_write_complete(mgr, info);
}

+static int fpga_mgr_streaming_fw_cb(void *context, const struct firmware *fw)
+{
+ int ret = -EINVAL;
+ struct driver_data_req_params *params =
+ (struct driver_data_req_params *)context;
+ struct fpga_image_info *info = (struct fpga_image_info *)
+ params->streaming_reqs.opt_ctx1;
+ struct fpga_manager *mgr = (struct fpga_manager *)
+ params->streaming_reqs.opt_ctx2;
+ struct device *dev = &mgr->dev;
+
+ /*
+ * init.
+ */
+ if (params->streaming_reqs.offset == 0) {
+ ret = fpga_mgr_write_init_buf(mgr, info, fw->data, fw->size);
+ if (ret)
+ return ret;
+ }
+
+ /*
+ * Write the FPGA image to the FPGA.
+ */
+ mgr->state = FPGA_MGR_STATE_WRITE;
+ ret = mgr->mops->write(mgr, fw->data, fw->size);
+ if (ret) {
+ dev_err(dev, "Error while writing image data to FPGA\n");
+ mgr->state = FPGA_MGR_STATE_WRITE_ERR;
+ return ret;
+ }
+
+ params->streaming_reqs.offset += fw->size;
+ if (fw->size < SZ_4K)
+ ret = fpga_mgr_write_complete(mgr, info);
+
+ return ret;
+}
+
+/**
+ * fpga_mgr_firmware_stream - streaming firmware and load to fpga
+ * @mgr: fpga manager
+ * @info: fpga image specific information
+ * @image_name: name of image file on the firmware search path
+ *
+ * Streaming an FPGA image using the firmware class, then write out to the FPGA.
+ * Update the state before each step to provide info on what step failed if
+ * there is a failure. This code assumes the caller got the mgr pointer
+ * from of_fpga_mgr_get() or fpga_mgr_get() and checked that it is not an error
+ * code.
+ *
+ * Return: 0 on success, negative error code otherwise.
+ */
+int fpga_mgr_firmware_stream(struct fpga_manager *mgr,
+ struct fpga_image_info *info,
+ const char *image_name)
+{
+ int ret;
+ const struct firmware *fw = NULL;
+ char *path = NULL;
+ size_t length = INT_MAX;
+ struct device *dev = &mgr->dev;
+ const struct driver_data_req_params req_params = {
+ .streaming_reqs.streaming = true,
+ .streaming_reqs.offset = 0,
+ .streaming_reqs.driver_data = &fw,
+ .streaming_reqs.path = &path,
+ .streaming_reqs.buf_size = SZ_4K,
+ .streaming_reqs.opt_ctx1 = info,
+ .streaming_reqs.opt_ctx2 = mgr,
+ DRIVER_DATA_KEEP_SYNC(fpga_mgr_streaming_fw_cb,
+ &req_params),
+ };
+
+ mgr->state = FPGA_MGR_STATE_FIRMWARE_REQ;
+ while (length > 0) {
+ ret = driver_data_request_sync(image_name, &req_params, dev);
+ if (ret) {
+ dev_err(dev, "Error reading firmware %d\n", ret);
+ mgr->state = FPGA_MGR_STATE_FIRMWARE_REQ_ERR;
+ return ret;
+ }
+
+ length -= fw->size;
+ if (fw->size < SZ_4K)
+ break;
+ }
+
+ __putname(*req_params.streaming_reqs.path);
+ release_firmware(fw);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(fpga_mgr_firmware_stream);
+
/**
* fpga_mgr_buf_load - load fpga from image in buffer
* @mgr: fpga manager
diff --git a/include/linux/fpga/fpga-mgr.h b/include/linux/fpga/fpga-mgr.h
index e2ef94fd..97907f5 100644
--- a/include/linux/fpga/fpga-mgr.h
+++ b/include/linux/fpga/fpga-mgr.h
@@ -140,6 +140,10 @@ int fpga_mgr_firmware_load(struct fpga_manager *mgr,
struct fpga_image_info *info,
const char *image_name);

+int fpga_mgr_firmware_stream(struct fpga_manager *mgr,
+ struct fpga_image_info *info,
+ const char *image_name);
+
struct fpga_manager *of_fpga_mgr_get(struct device_node *node);

struct fpga_manager *fpga_mgr_get(struct device *dev);
--
2.7.4
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