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From: Vinod Koul <vkoul@kernel.org>
To: Mathias Nyman <mathias.nyman@intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-arm-msm@vger.kernel.org,
	"Bjorn Andersson" <bjorn.andersson@linaro.org>,
	"Vinod Koul" <vkoul@kernel.org>,
	"Yoshihiro Shimoda" <yoshihiro.shimoda.uh@renesas.com>,
	"Christian Lamparter" <chunkeey@googlemail.com>,
	"John Stultz" <john.stultz@linaro.org>,
	"Alan Stern" <stern@rowland.harvard.edu>,
	"Andreas Böhler" <dev@aboehler.at>,
	linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v11 5/5] usb: xhci: provide a debugfs hook for erasing rom
Date: Thu, 30 Apr 2020 15:40:19 +0530	[thread overview]
Message-ID: <20200430101019.1130956-6-vkoul@kernel.org> (raw)
In-Reply-To: <20200430101019.1130956-1-vkoul@kernel.org>

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(+)

diff --git a/drivers/usb/host/xhci-pci-renesas.c b/drivers/usb/host/xhci-pci-renesas.c
index aebd9546d994..977a4d4a3b54 100644
--- a/drivers/usb/host/xhci-pci-renesas.c
+++ b/drivers/usb/host/xhci-pci-renesas.c
@@ -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;
@@ -638,4 +670,5 @@ int renesas_xhci_check_request_fw(struct pci_dev *pdev,
 
 void renesas_xhci_pci_exit(struct pci_dev *dev)
 {
+	debugfs_exit();
 }
-- 
2.25.3


      parent reply	other threads:[~2020-04-30 10:11 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-30 10:10 [PATCH v11 0/5] usb: xhci: Add support for Renesas USB controllers Vinod Koul
2020-04-30 10:10 ` [PATCH v11 1/5] usb: hci: add hc_driver as argument for usb_hcd_pci_probe Vinod Koul
2020-04-30 10:10 ` [PATCH v11 2/5] usb: renesas-xhci: Add the renesas xhci driver Vinod Koul
2020-04-30 14:36   ` Mathias Nyman
2020-04-30 14:46     ` Vinod Koul
2020-04-30 14:53       ` Greg Kroah-Hartman
2020-04-30 15:26         ` Vinod Koul
2020-04-30 15:35           ` Greg Kroah-Hartman
2020-04-30 10:10 ` [PATCH v11 3/5] usb: xhci: Add support for Renesas controller with memory Vinod Koul
2020-04-30 10:10 ` [PATCH v11 4/5] usb: renesas-xhci: Add ROM loader for uPD720201 Vinod Koul
2020-04-30 10:10 ` Vinod Koul [this message]

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