On Fri, Jul 21, 2023, at 8:29 AM, David Ober wrote:
> This modules is to allow for the new ITE 5632 EC chip
> to support the watchdog for initial use in the Lenovo SE10
>
> Signed-off-by: David Ober <dober6023@xxxxxxxxx>
>
> V2 Fix stop to deactivate wdog on unload of module
> V2 Remove extra logging that is not needed
> V2 change udelays to usleep_range
> V2 Changed to now request region on start and release on stop instead
> of for every ping and read/write
> V3 add counter to while loops so it will not hang
> V3 rework code to use platform_device_register_simple
> V3 rework getting the Chip ID to remove duplicate code and close IO
> V3 change some extra logging to be debug only
> ---
> drivers/watchdog/Kconfig | 10 ++
> drivers/watchdog/Makefile | 1 +
> drivers/watchdog/ite5632_wdt.c | 278 +++++++++++++++++++++++++++++++++
> 3 files changed, 289 insertions(+)
> create mode 100644 drivers/watchdog/ite5632_wdt.c
>
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index ee97d89dfc11..861cc0eff468 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -264,6 +264,16 @@ config MENZ069_WATCHDOG
> This driver can also be built as a module. If so the module
> will be called menz069_wdt.
>
> +config ITE5632_WDT
> + tristate "ITE 5632"
> + select WATCHDOG_CORE
> + help
> + If you say yes here you get support for the watchdog
> + functionality of the ITE 5632 eSIO chip.
> +
> + This driver can also be built as a module. If so, the module
> + will be called ite5632_wdt.
> +
> config WDAT_WDT
> tristate "ACPI Watchdog Action Table (WDAT)"
> depends on ACPI
> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index 3633f5b98236..32c8340f3175 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -119,6 +119,7 @@ obj-$(CONFIG_WAFER_WDT) += wafer5823wdt.o
> obj-$(CONFIG_I6300ESB_WDT) += i6300esb.o
> obj-$(CONFIG_IE6XX_WDT) += ie6xx_wdt.o
> obj-$(CONFIG_ITCO_WDT) += iTCO_wdt.o
> +obj-$(CONFIG_ITE5632_WDT) += ite5632_wdt.o
> ifeq ($(CONFIG_ITCO_VENDOR_SUPPORT),y)
> obj-$(CONFIG_ITCO_WDT) += iTCO_vendor_support.o
> endif
> diff --git a/drivers/watchdog/ite5632_wdt.c b/drivers/watchdog/ite5632_wdt.c
> new file mode 100644
> index 000000000000..efa0881eef4a
> --- /dev/null
> +++ b/drivers/watchdog/ite5632_wdt.c
> @@ -0,0 +1,278 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Customized ITE5632 WDT driver for Lenovo SE10.
> + *
> + */
> +
> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +
> +#include <linux/delay.h>
> +#include <linux/init.h>
> +#include <linux/io.h>
> +#include <linux/ioport.h>
> +#include <linux/module.h>
> +#include <linux/moduleparam.h>
> +#include <linux/platform_device.h>
> +#include <linux/string.h>
> +#include <linux/types.h>
> +#include <linux/watchdog.h>
> +
> +#define ITE5632_SIO_UNLOCK_KEY 0x87
> +#define ITE5632_SIO_LOCK_KEY 0xAA
> +
> +#define EC_STATUS_port 0x6C
> +#define EC_CMD_port 0x6C
> +#define EC_DATA_port 0x68
> +#define EC_OBF 0x01
> +#define EC_IBF 0x02
> +#define CFG_LDN 0x07
> +#define CFG_BRAM_LDN 0x10 /* for BRAM Base */
> +#define CFG_PORT 0x2E
> +
> +#define CUS_WDT_SWI 0x1A
> +#define CUS_WDT_CFG 0x1B
> +#define CUS_WDT_FEED 0xB0
> +#define CUS_WDT_CNT 0xB1
> +
> +#define DRVNAME "ite5632"
> +
> +/*The timeout range is 1-255 seconds*/
> +#define MIN_TIMEOUT 1
> +#define MAX_TIMEOUT 255
> +#define MAX_WAIT 10
> +
> +#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
> +static unsigned short bram_base;
> +
> +static int timeout; /* in seconds */
> +module_param(timeout, int, 0);
> +MODULE_PARM_DESC(timeout,
> + "Watchdog timeout in seconds. 1 <= timeout <= 255, default="
> + __MODULE_STRING(WATCHDOG_TIMEOUT) ".");
> +
> +static bool nowayout = WATCHDOG_NOWAYOUT;
> +module_param(nowayout, bool, 0);
> +MODULE_PARM_DESC(nowayout,
> + "Watchdog cannot be stopped once started (default="
> + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
> +
> +/* the watchdog platform device */
> +static struct platform_device *ite5632wdt_platform_device;
> +
> +/* Kernel methods. */
> +static void set_bram(unsigned char offset, unsigned char val)
> +{
> + outb(offset, bram_base);
> + outb(val, bram_base + 1);
> +}
> +
> +/* wait EC output buffer full */
> +static void wait_EC_OBF(void)
> +{
> + int loop = 0;
> +
> + while (1) {
> + if (inb(EC_STATUS_port) & EC_OBF || loop > MAX_WAIT)
> + break;
> + loop++;
> + usleep_range(10, 125);
> + }
> +}
> +
> +/* wait EC input buffer empty */
> +static void wait_EC_IBE(void)
> +{
> + int loop = 0;
> +
> + while (1) {
> + if (!(inb(EC_STATUS_port) & EC_IBF) || loop > MAX_WAIT)
> + break;
> + loop++;
> + usleep_range(10, 125);
> + }
> +}
> +
> +static void send_EC_cmd(unsigned char eccmd)
> +{
> + wait_EC_IBE();
> + outb(eccmd, EC_CMD_port);
> + wait_EC_IBE();
> +}
> +
> +static unsigned char Read_EC_data(void)
> +{
> + wait_EC_OBF();
> + return inb(EC_DATA_port);
> +}
> +
> +static void LPC_Write_Byte(unsigned char index, unsigned char data)
> +{
> + outb(index, CFG_PORT);
> + outb(data, CFG_PORT + 1);
> +}
> +
> +static unsigned char LPC_Read_Byte(unsigned char index)
> +{
> + outb(index, CFG_PORT);
> + return inb(CFG_PORT + 1);
> +}
> +
> +static int GetChipID(void)
> +{
> + unsigned char MSB, LSB;
> + unsigned char cmd = 0x55;
> +
> + outb(ITE5632_SIO_UNLOCK_KEY, CFG_PORT);
> + outb(0x01, CFG_PORT);
> + outb(0x55, CFG_PORT);
> + outb(cmd, CFG_PORT);
> + MSB = LPC_Read_Byte(0x20);
> + LSB = LPC_Read_Byte(0x21);
> + outb(ITE5632_SIO_LOCK_KEY, CFG_PORT);
> + return (MSB * 256 + LSB);
> +}
> +
> +static int wdt_start(struct watchdog_device *wdog)
> +{
> + set_bram(CUS_WDT_SWI, 0x80);
> + return 0;
> +}
> +
> +static int wdt_set_timeout(struct watchdog_device *wdog, unsigned int timeout)
> +{
> + wdog->timeout = timeout;
> + set_bram(CUS_WDT_CFG, wdog->timeout);
> + return 0;
> +}
> +
> +static int wdt_stop(struct watchdog_device *wdog)
> +{
> + set_bram(CUS_WDT_SWI, 0);
> + return 0;
> +}
> +
> +static unsigned int wdt_get_time(struct watchdog_device *wdog)
> +{
> + unsigned int timeleft;
> +
> + send_EC_cmd(CUS_WDT_CNT);
> +
> + timeleft = Read_EC_data();
> + return timeleft;
> +}
> +
> +static int wdt_ping(struct watchdog_device *wdog)
> +{
> + send_EC_cmd(CUS_WDT_FEED);
> + return 0;
> +}
> +
> +/* Kernel Interfaces */
> +static const struct watchdog_info wdt_info = {
> + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
> + .identity = "5632 Watchdog",
> +};
> +
> +static const struct watchdog_ops wdt_ops = {
> + .owner = THIS_MODULE,
> + .start = wdt_start,
> + .stop = wdt_stop,
> + .ping = wdt_ping,
> + .set_timeout = wdt_set_timeout,
> + .get_timeleft = wdt_get_time,
> +};
> +
> +static int ite5632_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct watchdog_device *wdt;
> + int ret;
> +
> + dev_dbg(&pdev->dev, "Probe ITE5632 called\n");
> +
> + wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
> + if (!wdt) {
> + release_region(EC_DATA_port, 5);
> + return -ENOMEM;
> + }
> +
> + wdt->info = &wdt_info,
> + wdt->ops = &wdt_ops,
> + wdt->timeout = WATCHDOG_TIMEOUT; /* Set default timeout */
> + wdt->min_timeout = MIN_TIMEOUT;
> + wdt->max_timeout = MAX_TIMEOUT;
> + wdt->parent = &pdev->dev;
> +
> + watchdog_init_timeout(wdt, timeout, &pdev->dev);
> + watchdog_set_nowayout(wdt, nowayout);
> + watchdog_stop_on_reboot(wdt);
> + watchdog_stop_on_unregister(wdt);
> +
> + ret = devm_watchdog_register_device(dev, wdt);
> +
> + dev_dbg(&pdev->dev, "initialized. timeout=%d sec (nowayout=%d)\n",
> + wdt->timeout, nowayout);
> +
> + return ret;
> +}
> +
> +static struct platform_driver ite5632_driver = {
> + .driver = {
> + .name = DRVNAME,
> + },
> + .probe = ite5632_probe,
> +};
> +
> +static int __init wdt_init(void)
> +{
> + int err;
> + int chip;
> +
> + if (!request_region(EC_DATA_port, 5, "EC")) {
> + pr_err(":request fail\n");
> + return -EIO;
> + }
> + chip = GetChipID();
> +
> + if (chip != 0x5632) {
> + release_region(EC_DATA_port, 5);
> + return -ENODEV;
> + }
> + pr_info("Found ITE ChipID = %4X\n", chip);
> +
> + LPC_Write_Byte(CFG_LDN, CFG_BRAM_LDN);
> + bram_base = (LPC_Read_Byte(0x60) << 8) | LPC_Read_Byte(0x61);
> +
> + ite5632wdt_platform_device = platform_device_register_simple(DRVNAME,
> + -1, NULL, 0);
> + if (IS_ERR(ite5632wdt_platform_device)) {
> + release_region(EC_DATA_port, 5);
> + return PTR_ERR(ite5632wdt_platform_device);
> + }
> +
> + err = platform_driver_probe(&ite5632_driver, ite5632_probe);
> + if (err)
> + goto unreg_platform_device;
> +
> + return 0;
> +
> +unreg_platform_device:
> + platform_device_unregister(ite5632wdt_platform_device);
> + release_region(EC_DATA_port, 5);
> + return err;
> +}
> +
> +static void __exit wdt_exit(void)
> +{
> + platform_device_unregister(ite5632wdt_platform_device);
> + platform_driver_unregister(&ite5632_driver);
> +
> + release_region(EC_DATA_port, 5);
> +}
> +
> +module_init(wdt_init);
> +module_exit(wdt_exit);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("David Ober<dober@xxxxxxxxxx>");
> +MODULE_DESCRIPTION("WDT driver for ITE5632");
> --
> 2.34.1
Tested this on my SE10 using the kernel selftests watchdog-test utility and it worked well. Was able to configure timeouts and system rebooted when either hung via sysrq-trigger; or by pausing the watchdog feeding.
Was able to enable and then disable the watchdog and not trigger a reboot.
Tested-by: Mark Pearson <mpearson-lenovo@xxxxxxxxx>
Please let us know if there is anything else needed to get this accepted. Happy to address any feedback.
Mark
