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firmware: xilinx: Add debugfs interface

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Firmware-debug provides debugfs interface to all APIs.
Debugfs can be used to call firmware APIs with required
parameters.

Usage:
* Calling firmware API through debugfs:
  # echo "<api-name> <arg1> .. <argn>" > /sys/.../zynqmp-firmware/pm

* Read output of last called firmware API:
  # cat /sys/.../zynqmp-firmware/pm

Refer ug1200 for more information on these APIs:
  * https://www.xilinx.com/support/documentation/user_guides/ug1200-eemi-api.pdf

Add basic debugfs file to get API version.

Signed-off-by: Rajan Vaja <rajanv@xilinx.com>
Signed-off-by: Jolly Shah <jollys@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Rajan Vaja
2018-09-12 12:38:39 -07:00
committed by Michal Simek
parent f9627312e2
commit b321725257
5 changed files with 259 additions and 0 deletions
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5
drivers/firmware/xilinx/zynqmp.c
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@@ -21,6 +21,7 @@
#include <linux/uaccess.h>
#include <linux/firmware/xlnx-zynqmp.h>
#include "zynqmp-debug.h"
/**
* zynqmp_pm_ret_code() - Convert PMU-FW error codes to Linux error codes
@@ -493,11 +494,15 @@ static int zynqmp_firmware_probe(struct platform_device *pdev)
pr_info("%s Trustzone version v%d.%d\n", __func__,
pm_tz_version >> 16, pm_tz_version & 0xFFFF);
zynqmp_pm_api_debugfs_init();
return of_platform_populate(dev->of_node, NULL, NULL, dev);
}
static int zynqmp_firmware_remove(struct platform_device *pdev)
{
zynqmp_pm_api_debugfs_exit();
return 0;
}