Re: [RFC 1/8] fpga-mgr: add a single function for fpga loading methods
From: matthew . gerlach
Date: Wed Feb 15 2017 - 19:37:28 EST
Hi Alan,
On Wed, 15 Feb 2017, Alan Tull wrote:
Currently fpga-mgr.c has three methods for loading FPGA's depending on how
the FPGA image is presented: in a sg table, as a single buffer, or as a
firmware file. This commit adds these parameters to the fpga_image_info
stuct and adds a single function that can accept the image as any of these
three. This allows code to be written that could use any of the three
methods.
Signed-off-by: Alan Tull <atull@xxxxxxxxxx>
---
drivers/fpga/fpga-mgr.c | 12 ++++++++++++
drivers/fpga/fpga-region.c | 17 +++++++----------
include/linux/fpga/fpga-mgr.h | 10 ++++++++++
3 files changed, 29 insertions(+), 10 deletions(-)
diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c
index 86d2cb2..b7c719a 100644
--- a/drivers/fpga/fpga-mgr.c
+++ b/drivers/fpga/fpga-mgr.c
@@ -309,6 +309,18 @@ int fpga_mgr_firmware_load(struct fpga_manager *mgr,
}
EXPORT_SYMBOL_GPL(fpga_mgr_firmware_load);
+int fpga_mgr_load(struct fpga_manager *mgr, struct fpga_image_info *info)
+{
+ if (info->firmware_name)
+ return fpga_mgr_firmware_load(mgr, info, info->firmware_name);
+ if (info->sgt)
+ return fpga_mgr_buf_load_sg(mgr, info, info->sgt);
+ if (info->buf && info->count)
+ return fpga_mgr_buf_load(mgr, info, info->buf, info->count);
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(fpga_mgr_load);
+
I like this cleaner api.
static const char * const state_str[] = {
[FPGA_MGR_STATE_UNKNOWN] = "unknown",
[FPGA_MGR_STATE_POWER_OFF] = "power off",
diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c
index 3222fdb..24f4ed5 100644
--- a/drivers/fpga/fpga-region.c
+++ b/drivers/fpga/fpga-region.c
@@ -223,14 +223,11 @@ static int fpga_region_get_bridges(struct fpga_region *region,
/**
* fpga_region_program_fpga - program FPGA
* @region: FPGA region
- * @firmware_name: name of FPGA image firmware file
* @overlay: device node of the overlay
- * Program an FPGA using information in the device tree.
- * Function assumes that there is a firmware-name property.
+ * Program an FPGA using information in the region's fpga image info.
* Return 0 for success or negative error code.
*/
static int fpga_region_program_fpga(struct fpga_region *region,
- const char *firmware_name,
struct device_node *overlay)
{
struct fpga_manager *mgr;
@@ -260,7 +257,7 @@ static int fpga_region_program_fpga(struct fpga_region *region,
goto err_put_br;
}
- ret = fpga_mgr_firmware_load(mgr, region->info, firmware_name);
+ ret = fpga_mgr_load(mgr, region->info);
if (ret) {
pr_err("failed to load fpga image\n");
goto err_put_br;
@@ -351,7 +348,6 @@ static int child_regions_with_firmware(struct device_node *overlay)
static int fpga_region_notify_pre_apply(struct fpga_region *region,
struct of_overlay_notify_data *nd)
{
- const char *firmware_name = NULL;
struct fpga_image_info *info;
int ret;
@@ -373,7 +369,8 @@ static int fpga_region_notify_pre_apply(struct fpga_region *region,
if (of_property_read_bool(nd->overlay, "external-fpga-config"))
info->flags |= FPGA_MGR_EXTERNAL_CONFIG;
- of_property_read_string(nd->overlay, "firmware-name", &firmware_name);
+ of_property_read_string(nd->overlay, "firmware-name",
+ &info->firmware_name);
of_property_read_u32(nd->overlay, "region-unfreeze-timeout-us",
&info->enable_timeout_us);
@@ -382,7 +379,7 @@ static int fpga_region_notify_pre_apply(struct fpga_region *region,
&info->disable_timeout_us);
/* If FPGA was externally programmed, don't specify firmware */
- if ((info->flags & FPGA_MGR_EXTERNAL_CONFIG) && firmware_name) {
+ if ((info->flags & FPGA_MGR_EXTERNAL_CONFIG) && info->firmware_name) {
pr_err("error: specified firmware and external-fpga-config");
return -EINVAL;
}
@@ -392,12 +389,12 @@ static int fpga_region_notify_pre_apply(struct fpga_region *region,
return 0;
/* If we got this far, we should be programming the FPGA */
- if (!firmware_name) {
+ if (!info->firmware_name) {
pr_err("should specify firmware-name or external-fpga-config\n");
return -EINVAL;
}
- return fpga_region_program_fpga(region, firmware_name, nd->overlay);
+ return fpga_region_program_fpga(region, nd->overlay);
}
/**
diff --git a/include/linux/fpga/fpga-mgr.h b/include/linux/fpga/fpga-mgr.h
index 57beb5d..45df05a 100644
--- a/include/linux/fpga/fpga-mgr.h
+++ b/include/linux/fpga/fpga-mgr.h
@@ -76,11 +76,19 @@ enum fpga_mgr_states {
* @flags: boolean flags as defined above
* @enable_timeout_us: maximum time to enable traffic through bridge (uSec)
* @disable_timeout_us: maximum time to disable traffic through bridge (uSec)
+ * @firmware_name: name of FPGA image firmware file
+ * @sgt: scatter/gather table containing FPGA image
+ * @buf: contiguous buffer containing FPGA image
+ * @count: size of buf
*/
struct fpga_image_info {
u32 flags;
u32 enable_timeout_us;
u32 disable_timeout_us;
We really need to address your patch adds the config_complete_timout_us.
It seems like it would conflict with this patch.
+ const char *firmware_name;
+ struct sg_table *sgt;
+ const char *buf;
+ size_t count;
};
/**
@@ -139,6 +147,8 @@ int fpga_mgr_firmware_load(struct fpga_manager *mgr,
struct fpga_image_info *info,
const char *image_name);
+int fpga_mgr_load(struct fpga_manager *mgr, struct fpga_image_info *info);
+
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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