/* * Maxim MAX77620 Watchdog Driver * * Copyright (C) 2016 NVIDIA CORPORATION. All rights reserved. * * Author: Laxman Dewangan * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #include static bool nowayout = WATCHDOG_NOWAYOUT; struct max77620_wdt { struct device *dev; struct regmap *rmap; struct watchdog_device wdt_dev; }; static int max77620_wdt_start(struct watchdog_device *wdt_dev) { struct max77620_wdt *wdt = watchdog_get_drvdata(wdt_dev); return regmap_update_bits(wdt->rmap, MAX77620_REG_CNFGGLBL2, MAX77620_WDTEN, MAX77620_WDTEN); } static int max77620_wdt_stop(struct watchdog_device *wdt_dev) { struct max77620_wdt *wdt = watchdog_get_drvdata(wdt_dev); return regmap_update_bits(wdt->rmap, MAX77620_REG_CNFGGLBL2, MAX77620_WDTEN, 0); } static int max77620_wdt_ping(struct watchdog_device *wdt_dev) { struct max77620_wdt *wdt = watchdog_get_drvdata(wdt_dev); return regmap_update_bits(wdt->rmap, MAX77620_REG_CNFGGLBL3, MAX77620_WDTC_MASK, 0x1); } static int max77620_wdt_set_timeout(struct watchdog_device *wdt_dev, unsigned int timeout) { struct max77620_wdt *wdt = watchdog_get_drvdata(wdt_dev); unsigned int wdt_timeout; u8 regval; int ret; switch (timeout) { case 0 ... 2: regval = MAX77620_TWD_2s; wdt_timeout = 2; break; case 3 ... 16: regval = MAX77620_TWD_16s; wdt_timeout = 16; break; case 17 ... 64: regval = MAX77620_TWD_64s; wdt_timeout = 64; break; default: regval = MAX77620_TWD_128s; wdt_timeout = 128; break; } ret = regmap_update_bits(wdt->rmap, MAX77620_REG_CNFGGLBL3, MAX77620_WDTC_MASK, 0x1); if (ret < 0) return ret; ret = regmap_update_bits(wdt->rmap, MAX77620_REG_CNFGGLBL2, MAX77620_TWD_MASK, regval); if (ret < 0) return ret; wdt_dev->timeout = wdt_timeout; return 0; } static const struct watchdog_info max77620_wdt_info = { .identity = "max77620-watchdog", .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, }; static const struct watchdog_ops max77620_wdt_ops = { .start = max77620_wdt_start, .stop = max77620_wdt_stop, .ping = max77620_wdt_ping, .set_timeout = max77620_wdt_set_timeout, }; static int max77620_wdt_probe(struct platform_device *pdev) { struct max77620_wdt *wdt; struct watchdog_device *wdt_dev; unsigned int regval; int ret; wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL); if (!wdt) return -ENOMEM; wdt->dev = &pdev->dev; wdt->rmap = dev_get_regmap(pdev->dev.parent, NULL); if (!wdt->rmap) { dev_err(wdt->dev, "Failed to get parent regmap\n"); return -ENODEV; } wdt_dev = &wdt->wdt_dev; wdt_dev->info = &max77620_wdt_info; wdt_dev->ops = &max77620_wdt_ops; wdt_dev->min_timeout = 2; wdt_dev->max_timeout = 128; wdt_dev->max_hw_heartbeat_ms = 128 * 1000; platform_set_drvdata(pdev, wdt); /* Enable WD_RST_WK - WDT expire results in a restart */ ret = regmap_update_bits(wdt->rmap, MAX77620_REG_ONOFFCNFG2, MAX77620_ONOFFCNFG2_WD_RST_WK, MAX77620_ONOFFCNFG2_WD_RST_WK); if (ret < 0) { dev_err(wdt->dev, "Failed to set WD_RST_WK: %d\n", ret); return ret; } /* Set WDT clear in OFF and sleep mode */ ret = regmap_update_bits(wdt->rmap, MAX77620_REG_CNFGGLBL2, MAX77620_WDTOFFC | MAX77620_WDTSLPC, MAX77620_WDTOFFC | MAX77620_WDTSLPC); if (ret < 0) { dev_err(wdt->dev, "Failed to set WDT OFF mode: %d\n", ret); return ret; } /* Check if WDT running and if yes then set flags properly */ ret = regmap_read(wdt->rmap, MAX77620_REG_CNFGGLBL2, ®val); if (ret < 0) { dev_err(wdt->dev, "Failed to read WDT CFG register: %d\n", ret); return ret; } switch (regval & MAX77620_TWD_MASK) { case MAX77620_TWD_2s: wdt_dev->timeout = 2; break; case MAX77620_TWD_16s: wdt_dev->timeout = 16; break; case MAX77620_TWD_64s: wdt_dev->timeout = 64; break; default: wdt_dev->timeout = 128; break; } if (regval & MAX77620_WDTEN) set_bit(WDOG_HW_RUNNING, &wdt_dev->status); watchdog_set_nowayout(wdt_dev, nowayout); watchdog_set_drvdata(wdt_dev, wdt); ret = watchdog_register_device(wdt_dev); if (ret < 0) { dev_err(&pdev->dev, "watchdog registration failed: %d\n", ret); return ret; } return 0; } static int max77620_wdt_remove(struct platform_device *pdev) { struct max77620_wdt *wdt = platform_get_drvdata(pdev); max77620_wdt_stop(&wdt->wdt_dev); watchdog_unregister_device(&wdt->wdt_dev); return 0; } static struct platform_device_id max77620_wdt_devtype[] = { { .name = "max77620-watchdog", }, { }, }; MODULE_DEVICE_TABLE(platform, max77620_wdt_devtype); static struct platform_driver max77620_wdt_driver = { .driver = { .name = "max77620-watchdog", }, .probe = max77620_wdt_probe, .remove = max77620_wdt_remove, .id_table = max77620_wdt_devtype, }; module_platform_driver(max77620_wdt_driver); MODULE_DESCRIPTION("Max77620 watchdog timer driver"); module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started " "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); MODULE_AUTHOR("Laxman Dewangan "); MODULE_LICENSE("GPL v2"); d>net-next: treewide use is_vlan_dev() helper function.Parav Pandit1-4/+2 2017-02-06net: remove ndo_neigh_{construct, destroy} from stacked devicesIdo Schimmel1-4/+0 2017-02-06can: rx-offload: Add support for timestamp based irq offloadingMarc Kleine-Budde1-1/+9 2017-02-06can: rx-offload: Add support for HW fifo based irq offloadingDavid Jander1-0/+51 2017-02-05net: remove __napi_complete()Eric Dumazet1-1/+0 2017-02-04net: ipv6: Change notifications for multipath add to RTA_MULTIPATHDavid Ahern1-0/+1 2017-02-04net: ipv6: Allow shorthand delete of all nexthops in multipath routeDavid Ahern1-1/+3 2017-02-03net: remove support for per driver ndo_busy_poll()Eric Dumazet2-5/+0 2017-02-03Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-nextDavid S. Miller11-40/+60 2017-02-03sched: cls_flower: expose priority to offloading netdeviceJiri Pirko1-0/+1 2017-02-03lib: Introduce priority array area managerJiri Pirko1-0/+76 2017-02-03list: introduce list_for_each_entry_from_reverse helperJiri Pirko1-0/+13 2017-02-03trace: rename trace_print_hex_seq arg and add kdocDaniel Borkmann2-3/+3 2017-02-03bridge: uapi: add per vlan tunnel infoRoopa Prabhu3-0/+13 2017-02-03vxlan: support fdb and learning in COLLECT_METADATA modeRoopa Prabhu1-0/+1 2017-02-03ip_tunnels: new IP_TUNNEL_INFO_BRIDGE flag for ip_tunnel_info modeRoopa Prabhu1-0/+1 2017-02-03net/sched: act_ife: Change to use ife moduleYotam Gigi2-10/+1 2017-02-03net: Introduce ife encapsulation moduleYotam Gigi3-0/+70 2017-02-03net/sched: act_ife: Unexport ife_tlv_meta_encodeYotam Gigi1-2/+0 2017-02-03tcp: add tcp_mss_clamp() helperEric Dumazet1-0/+9 2017-02-02net: add LINUX_MIB_PFMEMALLOCDROP counterEric Dumazet1-0/+1 2017-02-02net: phy: marvell: Add support for 88e1545 PHYAndrew Lunn1-0/+1 2017-02-02unix: add ioctl to open a unix socket file with O_PATHAndrey Vagin1-0/+2 2017-02-02net: phy: Marvell: Add mv88e6390 internal PHYAndrew Lunn1-0/+6 2017-02-02Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller9-30/+40 2017-02-02netfilter: allow logging from non-init namespacesMichal Kubeček1-0/+3 2017-02-02ipvs: free ip_vs_dest structs when refcnt=0David Windsor1-1/+1 2017-02-02netfilter: merge ctinfo into nfct pointer storage areaFlorian Westphal2-17/+15 2017-02-02netfilter: guarantee 8 byte minalign for template addressesFlorian Westphal1-0/+2 2017-02-02netfilter: add and use nf_ct_set helperFlorian Westphal2-2/+9 2017-02-02skbuff: add and use skb_nfct helperFlorian Westphal2-4/+11 2017-02-02netfilter: reduce direct skb->nfct usageFlorian Westphal1-3/+6 2017-02-02netfilter: conntrack: no need to pass ctinfo to error handlerFlorian Westphal1-1/+1