^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Watchdog timer driver for the WinSystems EBC-C384
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2016 William Breathitt Gray
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/dmi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/ioport.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/isa.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/watchdog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #define MODULE_NAME "ebc-c384_wdt"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define WATCHDOG_TIMEOUT 60
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * The timeout value in minutes must fit in a single byte when sent to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * watchdog timer; the maximum timeout possible is 15300 (255 * 60) seconds.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define WATCHDOG_MAX_TIMEOUT 15300
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define BASE_ADDR 0x564
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define ADDR_EXTENT 5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define CFG_ADDR (BASE_ADDR + 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define PET_ADDR (BASE_ADDR + 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) static bool nowayout = WATCHDOG_NOWAYOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) module_param(nowayout, bool, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) static unsigned timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) module_param(timeout, uint, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (default="
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) static int ebc_c384_wdt_start(struct watchdog_device *wdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) unsigned t = wdev->timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) /* resolution is in minutes for timeouts greater than 255 seconds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) if (t > 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) t = DIV_ROUND_UP(t, 60);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) outb(t, PET_ADDR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) static int ebc_c384_wdt_stop(struct watchdog_device *wdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) outb(0x00, PET_ADDR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) static int ebc_c384_wdt_set_timeout(struct watchdog_device *wdev, unsigned t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) /* resolution is in minutes for timeouts greater than 255 seconds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) if (t > 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) /* round second resolution up to minute granularity */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) wdev->timeout = roundup(t, 60);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) /* set watchdog timer for minutes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) outb(0x00, CFG_ADDR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) wdev->timeout = t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) /* set watchdog timer for seconds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) outb(0x80, CFG_ADDR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) static const struct watchdog_ops ebc_c384_wdt_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) .start = ebc_c384_wdt_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) .stop = ebc_c384_wdt_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) .set_timeout = ebc_c384_wdt_set_timeout
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) static const struct watchdog_info ebc_c384_wdt_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) .options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) .identity = MODULE_NAME
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) static int ebc_c384_wdt_probe(struct device *dev, unsigned int id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) struct watchdog_device *wdd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) if (!devm_request_region(dev, BASE_ADDR, ADDR_EXTENT, dev_name(dev))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) BASE_ADDR, BASE_ADDR + ADDR_EXTENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) wdd = devm_kzalloc(dev, sizeof(*wdd), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) if (!wdd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) wdd->info = &ebc_c384_wdt_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) wdd->ops = &ebc_c384_wdt_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) wdd->timeout = WATCHDOG_TIMEOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) wdd->min_timeout = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) wdd->max_timeout = WATCHDOG_MAX_TIMEOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) watchdog_set_nowayout(wdd, nowayout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) watchdog_init_timeout(wdd, timeout, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) return devm_watchdog_register_device(dev, wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) static struct isa_driver ebc_c384_wdt_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) .probe = ebc_c384_wdt_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) .name = MODULE_NAME
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static int __init ebc_c384_wdt_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) if (!dmi_match(DMI_BOARD_NAME, "EBC-C384 SBC"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return isa_register_driver(&ebc_c384_wdt_driver, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) static void __exit ebc_c384_wdt_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) isa_unregister_driver(&ebc_c384_wdt_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) module_init(ebc_c384_wdt_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) module_exit(ebc_c384_wdt_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) MODULE_DESCRIPTION("WinSystems EBC-C384 watchdog timer driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) MODULE_LICENSE("GPL v2");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) MODULE_ALIAS("isa:" MODULE_NAME);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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