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 v8 5/5] usb: xhci: provide a debugfs hook for erasing rom
Date: Mon, 23 Mar 2020 22:36:01 +0530 [thread overview]
Message-ID: <20200323170601.419809-6-vkoul@kernel.org> (raw)
In-Reply-To: <20200323170601.419809-1-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 | 35 +++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/drivers/usb/host/xhci-pci-renesas.c b/drivers/usb/host/xhci-pci-renesas.c
index 6301730b1f8d..714932eaac90 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>
@@ -162,6 +163,8 @@ static int renesas_fw_verify(struct pci_dev *dev,
return 0;
}
+static void debugfs_init(struct pci_dev *pdev);
+
static int renesas_check_rom_state(struct pci_dev *pdev)
{
u16 rom_state;
@@ -194,9 +197,11 @@ static int renesas_check_rom_state(struct pci_dev *pdev)
/* Check the "Result Code" Bits (6:4) and act accordingly */
switch (rom_state & RENESAS_ROM_STATUS_RESULT) {
case RENESAS_ROM_STATUS_SUCCESS:
+ debugfs_init(pdev);
return 0;
case RENESAS_ROM_STATUS_NO_RESULT: /* No result yet */
+ debugfs_init(pdev);
return 0;
case RENESAS_ROM_STATUS_ERROR: /* Error State */
@@ -443,6 +448,34 @@ 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_download_rom(struct pci_dev *pdev,
const u32 *fw, size_t step)
{
@@ -754,6 +787,8 @@ int renesas_xhci_pci_probe(struct pci_dev *dev,
int renesas_xhci_pci_remove(struct pci_dev *dev)
{
+ debugfs_exit();
+
if (renesas_fw_check_running(dev)) {
/*
* bail out early, if this was a renesas device w/o FW.
--
2.25.1
prev parent reply other threads:[~2020-03-23 17:07 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-23 17:05 [PATCH v8 0/5] usb: xhci: Add support for Renesas USB controllers Vinod Koul
2020-03-23 17:05 ` [PATCH v8 1/5] usb: hci: add hc_driver as argument for usb_hcd_pci_probe Vinod Koul
2020-03-26 9:13 ` Mathias Nyman
2020-03-23 17:05 ` [PATCH v8 2/5] usb: renesas-xhci: Add the renesas xhci driver Vinod Koul
2020-03-28 23:53 ` kbuild test robot
2020-03-23 17:05 ` [PATCH v8 3/5] usb: xhci: Add support for Renesas controller with memory Vinod Koul
2020-03-26 11:29 ` Mathias Nyman
2020-03-26 11:51 ` Vinod Koul
2020-04-01 12:57 ` Vinod Koul
2020-04-01 15:39 ` Christian Lamparter
2020-04-01 16:18 ` Vinod Koul
2020-04-04 10:08 ` Christian Lamparter
2020-03-23 17:06 ` [PATCH v8 4/5] usb: renesas-xhci: Add ROM loader for uPD720201 Vinod Koul
2020-03-23 17:06 ` Vinod Koul [this message]
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