^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * Watchdog driver for Technologic Systems TS-72xx based SBCs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * (TS-7200, TS-7250 and TS-7260). These boards have external
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * glue logic CPLD chip, which includes programmable watchdog
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * timer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (c) 2009 Mika Westerberg <mika.westerberg@iki.fi>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * This driver is based on ep93xx_wdt and wm831x_wdt drivers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * This file is licensed under the terms of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * License version 2. This program is licensed "as is" without any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * warranty of any kind, whether express or implied.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/watchdog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define TS72XX_WDT_DEFAULT_TIMEOUT 30
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static int timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) module_param(timeout, int, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) static bool nowayout = WATCHDOG_NOWAYOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) module_param(nowayout, bool, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) /* priv->control_reg */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define TS72XX_WDT_CTRL_DISABLE 0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define TS72XX_WDT_CTRL_250MS 0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define TS72XX_WDT_CTRL_500MS 0x02
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define TS72XX_WDT_CTRL_1SEC 0x03
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #define TS72XX_WDT_CTRL_RESERVED 0x04
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #define TS72XX_WDT_CTRL_2SEC 0x05
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #define TS72XX_WDT_CTRL_4SEC 0x06
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define TS72XX_WDT_CTRL_8SEC 0x07
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) /* priv->feed_reg */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #define TS72XX_WDT_FEED_VAL 0x05
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct ts72xx_wdt_priv {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) void __iomem *control_reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) void __iomem *feed_reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) struct watchdog_device wdd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) unsigned char regval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static int ts72xx_wdt_start(struct watchdog_device *wdd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) writeb(TS72XX_WDT_FEED_VAL, priv->feed_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) writeb(priv->regval, priv->control_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) static int ts72xx_wdt_stop(struct watchdog_device *wdd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) writeb(TS72XX_WDT_FEED_VAL, priv->feed_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) writeb(TS72XX_WDT_CTRL_DISABLE, priv->control_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) static int ts72xx_wdt_ping(struct watchdog_device *wdd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) writeb(TS72XX_WDT_FEED_VAL, priv->feed_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) static int ts72xx_wdt_settimeout(struct watchdog_device *wdd, unsigned int to)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (to == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) priv->regval = TS72XX_WDT_CTRL_1SEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) } else if (to == 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) priv->regval = TS72XX_WDT_CTRL_2SEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) } else if (to <= 4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) priv->regval = TS72XX_WDT_CTRL_4SEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) to = 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) priv->regval = TS72XX_WDT_CTRL_8SEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) if (to <= 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) to = 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) wdd->timeout = to;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) if (watchdog_active(wdd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) ts72xx_wdt_stop(wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) ts72xx_wdt_start(wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static const struct watchdog_info ts72xx_wdt_ident = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) .options = WDIOF_KEEPALIVEPING |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) WDIOF_SETTIMEOUT |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) WDIOF_MAGICCLOSE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) .firmware_version = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) .identity = "TS-72XX WDT",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) static const struct watchdog_ops ts72xx_wdt_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) .start = ts72xx_wdt_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) .stop = ts72xx_wdt_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) .ping = ts72xx_wdt_ping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) .set_timeout = ts72xx_wdt_settimeout,
^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 ts72xx_wdt_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) struct ts72xx_wdt_priv *priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) struct watchdog_device *wdd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (!priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) priv->control_reg = devm_platform_ioremap_resource(pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (IS_ERR(priv->control_reg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) return PTR_ERR(priv->control_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) priv->feed_reg = devm_platform_ioremap_resource(pdev, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) if (IS_ERR(priv->feed_reg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) return PTR_ERR(priv->feed_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) wdd = &priv->wdd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) wdd->info = &ts72xx_wdt_ident;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) wdd->ops = &ts72xx_wdt_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) wdd->min_timeout = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) wdd->max_hw_heartbeat_ms = 8000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) wdd->parent = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) watchdog_set_nowayout(wdd, nowayout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) wdd->timeout = TS72XX_WDT_DEFAULT_TIMEOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) watchdog_init_timeout(wdd, timeout, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) watchdog_set_drvdata(wdd, priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) ret = devm_watchdog_register_device(dev, wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) dev_info(dev, "TS-72xx Watchdog driver\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) static struct platform_driver ts72xx_wdt_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) .probe = ts72xx_wdt_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) .name = "ts72xx-wdt",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) module_platform_driver(ts72xx_wdt_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) MODULE_AUTHOR("Mika Westerberg <mika.westerberg@iki.fi>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) MODULE_DESCRIPTION("TS-72xx SBC Watchdog");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) MODULE_ALIAS("platform:ts72xx-wdt");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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