// SPDX-License-Identifier: GPL-2.0 /* * Window watchdog device driver for Xilinx Versal WWDT * * Copyright (C) 2022 - 2023, Advanced Micro Devices, Inc. */ #include <linux/clk.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/ioport.h> #include <linux/math64.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/watchdog.h> /* Max timeout is calculated at 100MHz source clock */ #define XWWDT_DEFAULT_TIMEOUT … #define XWWDT_MIN_TIMEOUT … /* Register offsets for the WWDT device */ #define XWWDT_MWR_OFFSET … #define XWWDT_ESR_OFFSET … #define XWWDT_FCR_OFFSET … #define XWWDT_FWR_OFFSET … #define XWWDT_SWR_OFFSET … /* Master Write Control Register Masks */ #define XWWDT_MWR_MASK … /* Enable and Status Register Masks */ #define XWWDT_ESR_WINT_MASK … #define XWWDT_ESR_WSW_MASK … #define XWWDT_ESR_WEN_MASK … #define XWWDT_CLOSE_WINDOW_PERCENT … static int wwdt_timeout; static int closed_window_percent; module_param(wwdt_timeout, int, 0); MODULE_PARM_DESC(…) …; module_param(closed_window_percent, int, 0); MODULE_PARM_DESC(…) …; /** * struct xwwdt_device - Watchdog device structure * @base: base io address of WDT device * @spinlock: spinlock for IO register access * @xilinx_wwdt_wdd: watchdog device structure * @freq: source clock frequency of WWDT * @close_percent: Closed window percent */ struct xwwdt_device { … }; static int xilinx_wwdt_start(struct watchdog_device *wdd) { … } static int xilinx_wwdt_keepalive(struct watchdog_device *wdd) { … } static const struct watchdog_info xilinx_wwdt_ident = …; static const struct watchdog_ops xilinx_wwdt_ops = …; static int xwwdt_probe(struct platform_device *pdev) { … } static const struct of_device_id xwwdt_of_match[] = …; MODULE_DEVICE_TABLE(of, xwwdt_of_match); static struct platform_driver xwwdt_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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