@@ -2,6 +2,7 @@
/* Copyright (C) 2019-2020 Linaro Limited */
#include <linux/acpi.h>
+#include <linux/debugfs.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/pci.h>
@@ -170,6 +171,8 @@ static int renesas_fw_verify(const void *fw_data,
return 0;
}
+static void debugfs_init(struct pci_dev *pdev);
+
static bool renesas_check_rom(struct pci_dev *pdev)
{
u16 rom_status;
@@ -183,6 +186,7 @@ static bool renesas_check_rom(struct pci_dev *pdev)
rom_status &= RENESAS_ROM_STATUS_ROM_EXISTS;
if (rom_status) {
dev_dbg(&pdev->dev, "External ROM exists\n");
+ debugfs_init(pdev);
return true; /* External ROM exists */
}
@@ -449,6 +453,34 @@ static void renesas_rom_erase(struct pci_dev *pdev)
dev_dbg(&pdev->dev, "ROM Erase... Done success\n");
}
+static int debugfs_rom_erase(void *data, u64 value)
+{
+ struct pci_dev *pdev = data;
+
+ if (value == 1) {
+ dev_dbg(&pdev->dev, "Userspace requested ROM erase\n");
+ renesas_rom_erase(pdev);
+ return 0;
+ }
+ return -EINVAL;
+}
+DEFINE_DEBUGFS_ATTRIBUTE(rom_erase_ops, NULL, debugfs_rom_erase, "%llu\n");
+
+static struct dentry *debugfs_root;
+
+static void debugfs_init(struct pci_dev *pdev)
+{
+ debugfs_root = debugfs_create_dir("renesas_usb", NULL);
+
+ debugfs_create_file("rom_erase", 0200, debugfs_root,
+ pdev, &rom_erase_ops);
+}
+
+static void debugfs_exit(void)
+{
+ debugfs_remove_recursive(debugfs_root);
+}
+
static bool renesas_setup_rom(struct pci_dev *pdev, const struct firmware *fw)
{
const u32 *fw_data = (const u32 *)fw->data;
@@ -639,6 +671,7 @@ EXPORT_SYMBOL_GPL(renesas_xhci_check_request_fw);
void renesas_xhci_pci_exit(struct pci_dev *dev)
{
+ debugfs_exit();
}
EXPORT_SYMBOL_GPL(renesas_xhci_pci_exit);
run "echo 1 > /sys/kernel/debug/renesas-usb/rom_erase" to erase firmware when driver is loaded. Subsequent init of driver shall reload the firmware Signed-off-by: Vinod Koul <vkoul@kernel.org> --- drivers/usb/host/xhci-pci-renesas.c | 33 +++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+)