This is a note to let you know that I've just added the patch titled
Watchdog: sp5100_tco: Add initialization using EFCH MMIO
to the 5.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
watchdog-sp5100_tco-add-initialization-using-efch-mmio.patch
and it can be found in the queue-5.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0578fff4aae5bce3f09875f58e68e9ffbab8daf5 Mon Sep 17 00:00:00 2001
From: Terry Bowman <terry.bowman@xxxxxxx>
Date: Wed, 2 Feb 2022 09:35:24 -0600
Subject: Watchdog: sp5100_tco: Add initialization using EFCH MMIO
From: Terry Bowman <terry.bowman@xxxxxxx>
commit 0578fff4aae5bce3f09875f58e68e9ffbab8daf5 upstream.
cd6h/cd7h port I/O can be disabled on recent AMD hardware. Read
accesses to disabled cd6h/cd7h port I/O will return F's and written
data is dropped. It is recommended to replace the cd6h/cd7h
port I/O with MMIO.
Co-developed-by: Robert Richter <rrichter@xxxxxxx>
Signed-off-by: Robert Richter <rrichter@xxxxxxx>
Signed-off-by: Terry Bowman <terry.bowman@xxxxxxx>
Tested-by: Jean Delvare <jdelvare@xxxxxxx>
Reviewed-by: Jean Delvare <jdelvare@xxxxxxx>
Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220202153525.1693378-4-terry.bowman@xxxxxxx
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Wim Van Sebroeck <wim@xxxxxxxxxxxxxxxxxx>
Cc: Mario Limonciello <Mario.Limonciello@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/watchdog/sp5100_tco.c | 100 +++++++++++++++++++++++++++++++++++++++++-
drivers/watchdog/sp5100_tco.h | 5 ++
2 files changed, 104 insertions(+), 1 deletion(-)
--- a/drivers/watchdog/sp5100_tco.c
+++ b/drivers/watchdog/sp5100_tco.c
@@ -49,7 +49,7 @@
/* internal variables */
enum tco_reg_layout {
- sp5100, sb800, efch
+ sp5100, sb800, efch, efch_mmio
};
struct sp5100_tco {
@@ -209,6 +209,8 @@ static void tco_timer_enable(struct sp51
~EFCH_PM_WATCHDOG_DISABLE,
EFCH_PM_DECODEEN_SECOND_RES);
break;
+ default:
+ break;
}
}
@@ -307,6 +309,99 @@ static int sp5100_tco_timer_init(struct
return 0;
}
+static u8 efch_read_pm_reg8(void __iomem *addr, u8 index)
+{
+ return readb(addr + index);
+}
+
+static void efch_update_pm_reg8(void __iomem *addr, u8 index, u8 reset, u8 set)
+{
+ u8 val;
+
+ val = readb(addr + index);
+ val &= reset;
+ val |= set;
+ writeb(val, addr + index);
+}
+
+static void tco_timer_enable_mmio(void __iomem *addr)
+{
+ efch_update_pm_reg8(addr, EFCH_PM_DECODEEN3,
+ ~EFCH_PM_WATCHDOG_DISABLE,
+ EFCH_PM_DECODEEN_SECOND_RES);
+}
+
+static int sp5100_tco_setupdevice_mmio(struct device *dev,
+ struct watchdog_device *wdd)
+{
+ struct sp5100_tco *tco = watchdog_get_drvdata(wdd);
+ const char *dev_name = SB800_DEVNAME;
+ u32 mmio_addr = 0, alt_mmio_addr = 0;
+ struct resource *res;
+ void __iomem *addr;
+ int ret;
+ u32 val;
+
+ res = request_mem_region_muxed(EFCH_PM_ACPI_MMIO_PM_ADDR,
+ EFCH_PM_ACPI_MMIO_PM_SIZE,
+ "sp5100_tco");
+
+ if (!res) {
+ dev_err(dev,
+ "Memory region 0x%08x already in use\n",
+ EFCH_PM_ACPI_MMIO_PM_ADDR);
+ return -EBUSY;
+ }
+
+ addr = ioremap(EFCH_PM_ACPI_MMIO_PM_ADDR, EFCH_PM_ACPI_MMIO_PM_SIZE);
+ if (!addr) {
+ dev_err(dev, "Address mapping failed\n");
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ /*
+ * EFCH_PM_DECODEEN_WDT_TMREN is dual purpose. This bitfield
+ * enables sp5100_tco register MMIO space decoding. The bitfield
+ * also starts the timer operation. Enable if not already enabled.
+ */
+ val = efch_read_pm_reg8(addr, EFCH_PM_DECODEEN);
+ if (!(val & EFCH_PM_DECODEEN_WDT_TMREN)) {
+ efch_update_pm_reg8(addr, EFCH_PM_DECODEEN, 0xff,
+ EFCH_PM_DECODEEN_WDT_TMREN);
+ }
+
+ /* Error if the timer could not be enabled */
+ val = efch_read_pm_reg8(addr, EFCH_PM_DECODEEN);
+ if (!(val & EFCH_PM_DECODEEN_WDT_TMREN)) {
+ dev_err(dev, "Failed to enable the timer\n");
+ ret = -EFAULT;
+ goto out;
+ }
+
+ mmio_addr = EFCH_PM_WDT_ADDR;
+
+ /* Determine alternate MMIO base address */
+ val = efch_read_pm_reg8(addr, EFCH_PM_ISACONTROL);
+ if (val & EFCH_PM_ISACONTROL_MMIOEN)
+ alt_mmio_addr = EFCH_PM_ACPI_MMIO_ADDR +
+ EFCH_PM_ACPI_MMIO_WDT_OFFSET;
+
+ ret = sp5100_tco_prepare_base(tco, mmio_addr, alt_mmio_addr, dev_name);
+ if (!ret) {
+ tco_timer_enable_mmio(addr);
+ ret = sp5100_tco_timer_init(tco);
+ }
+
+out:
+ if (addr)
+ iounmap(addr);
+
+ release_resource(res);
+
+ return ret;
+}
+
static int sp5100_tco_setupdevice(struct device *dev,
struct watchdog_device *wdd)
{
@@ -316,6 +411,9 @@ static int sp5100_tco_setupdevice(struct
u32 alt_mmio_addr = 0;
int ret;
+ if (tco->tco_reg_layout == efch_mmio)
+ return sp5100_tco_setupdevice_mmio(dev, wdd);
+
/* Request the IO ports used by this driver */
if (!request_muxed_region(SP5100_IO_PM_INDEX_REG,
SP5100_PM_IOPORTS_SIZE, "sp5100_tco")) {
--- a/drivers/watchdog/sp5100_tco.h
+++ b/drivers/watchdog/sp5100_tco.h
@@ -83,4 +83,9 @@
#define EFCH_PM_ISACONTROL_MMIOEN BIT(1)
#define EFCH_PM_ACPI_MMIO_ADDR 0xfed80000
+#define EFCH_PM_ACPI_MMIO_PM_OFFSET 0x00000300
#define EFCH_PM_ACPI_MMIO_WDT_OFFSET 0x00000b00
+
+#define EFCH_PM_ACPI_MMIO_PM_ADDR (EFCH_PM_ACPI_MMIO_ADDR + \
+ EFCH_PM_ACPI_MMIO_PM_OFFSET)
+#define EFCH_PM_ACPI_MMIO_PM_SIZE 8
Patches currently in stable-queue which might be from terry.bowman@xxxxxxx are
queue-5.17/watchdog-sp5100_tco-add-initialization-using-efch-mmio.patch
queue-5.17/i2c-piix4-add-efch-mmio-support-to-region-request-and-release.patch
queue-5.17/i2c-piix4-move-smbus-port-selection-into-function.patch
queue-5.17/i2c-piix4-add-efch-mmio-support-to-smbus-base-address-detect.patch
queue-5.17/i2c-piix4-move-port-i-o-region-request-release-code-into-functions.patch
queue-5.17/i2c-piix4-replace-hardcoded-memory-map-size-with-a-define.patch
queue-5.17/kernel-resource-introduce-request_mem_region_muxed.patch
queue-5.17/i2c-piix4-enable-efch-mmio-for-family-17h.patch
queue-5.17/watchdog-sp5100_tco-enable-family-17h-cpus.patch
queue-5.17/watchdog-sp5100_tco-move-timer-initialization-into-function.patch
queue-5.17/i2c-piix4-add-efch-mmio-support-for-smbus-port-select.patch
queue-5.17/watchdog-sp5100_tco-refactor-mmio-base-address-initialization.patch
queue-5.17/i2c-piix4-move-smbus-controller-base-address-detect-into-function.patch
