1aae03dc9SOleksij Rempel /* 2aae03dc9SOleksij Rempel * Watchdog driver for Alphascale ASM9260. 3aae03dc9SOleksij Rempel * 4aae03dc9SOleksij Rempel * Copyright (c) 2014 Oleksij Rempel <linux@rempel-privat.de> 5aae03dc9SOleksij Rempel * 6aae03dc9SOleksij Rempel * Licensed under GPLv2 or later. 7aae03dc9SOleksij Rempel */ 8aae03dc9SOleksij Rempel 9aae03dc9SOleksij Rempel #include <linux/bitops.h> 10aae03dc9SOleksij Rempel #include <linux/clk.h> 11aae03dc9SOleksij Rempel #include <linux/delay.h> 12aae03dc9SOleksij Rempel #include <linux/interrupt.h> 13aae03dc9SOleksij Rempel #include <linux/io.h> 14aae03dc9SOleksij Rempel #include <linux/module.h> 15aae03dc9SOleksij Rempel #include <linux/of.h> 16aae03dc9SOleksij Rempel #include <linux/platform_device.h> 17aae03dc9SOleksij Rempel #include <linux/reboot.h> 18aae03dc9SOleksij Rempel #include <linux/reset.h> 19aae03dc9SOleksij Rempel #include <linux/watchdog.h> 20aae03dc9SOleksij Rempel 21aae03dc9SOleksij Rempel #define CLOCK_FREQ 1000000 22aae03dc9SOleksij Rempel 23aae03dc9SOleksij Rempel /* Watchdog Mode register */ 24aae03dc9SOleksij Rempel #define HW_WDMOD 0x00 25aae03dc9SOleksij Rempel /* Wake interrupt. Set by HW, can't be cleared. */ 26aae03dc9SOleksij Rempel #define BM_MOD_WDINT BIT(3) 27aae03dc9SOleksij Rempel /* This bit set if timeout reached. Cleared by SW. */ 28aae03dc9SOleksij Rempel #define BM_MOD_WDTOF BIT(2) 29aae03dc9SOleksij Rempel /* HW Reset on timeout */ 30aae03dc9SOleksij Rempel #define BM_MOD_WDRESET BIT(1) 31aae03dc9SOleksij Rempel /* WD enable */ 32aae03dc9SOleksij Rempel #define BM_MOD_WDEN BIT(0) 33aae03dc9SOleksij Rempel 34aae03dc9SOleksij Rempel /* 35aae03dc9SOleksij Rempel * Watchdog Timer Constant register 36aae03dc9SOleksij Rempel * Minimal value is 0xff, the meaning of this value 37aae03dc9SOleksij Rempel * depends on used clock: T = WDCLK * (0xff + 1) * 4 38aae03dc9SOleksij Rempel */ 39aae03dc9SOleksij Rempel #define HW_WDTC 0x04 40aae03dc9SOleksij Rempel #define BM_WDTC_MAX(freq) (0x7fffffff / (freq)) 41aae03dc9SOleksij Rempel 42aae03dc9SOleksij Rempel /* Watchdog Feed register */ 43aae03dc9SOleksij Rempel #define HW_WDFEED 0x08 44aae03dc9SOleksij Rempel 45aae03dc9SOleksij Rempel /* Watchdog Timer Value register */ 46aae03dc9SOleksij Rempel #define HW_WDTV 0x0c 47aae03dc9SOleksij Rempel 48aae03dc9SOleksij Rempel #define ASM9260_WDT_DEFAULT_TIMEOUT 30 49aae03dc9SOleksij Rempel 50aae03dc9SOleksij Rempel enum asm9260_wdt_mode { 51aae03dc9SOleksij Rempel HW_RESET, 52aae03dc9SOleksij Rempel SW_RESET, 53aae03dc9SOleksij Rempel DEBUG, 54aae03dc9SOleksij Rempel }; 55aae03dc9SOleksij Rempel 56aae03dc9SOleksij Rempel struct asm9260_wdt_priv { 57aae03dc9SOleksij Rempel struct device *dev; 58aae03dc9SOleksij Rempel struct watchdog_device wdd; 59aae03dc9SOleksij Rempel struct clk *clk; 60aae03dc9SOleksij Rempel struct clk *clk_ahb; 61aae03dc9SOleksij Rempel struct reset_control *rst; 62aae03dc9SOleksij Rempel struct notifier_block restart_handler; 63aae03dc9SOleksij Rempel 64aae03dc9SOleksij Rempel void __iomem *iobase; 65aae03dc9SOleksij Rempel int irq; 66aae03dc9SOleksij Rempel unsigned long wdt_freq; 67aae03dc9SOleksij Rempel enum asm9260_wdt_mode mode; 68aae03dc9SOleksij Rempel }; 69aae03dc9SOleksij Rempel 70aae03dc9SOleksij Rempel static int asm9260_wdt_feed(struct watchdog_device *wdd) 71aae03dc9SOleksij Rempel { 72aae03dc9SOleksij Rempel struct asm9260_wdt_priv *priv = watchdog_get_drvdata(wdd); 73aae03dc9SOleksij Rempel 74aae03dc9SOleksij Rempel iowrite32(0xaa, priv->iobase + HW_WDFEED); 75aae03dc9SOleksij Rempel iowrite32(0x55, priv->iobase + HW_WDFEED); 76aae03dc9SOleksij Rempel 77aae03dc9SOleksij Rempel return 0; 78aae03dc9SOleksij Rempel } 79aae03dc9SOleksij Rempel 80aae03dc9SOleksij Rempel static unsigned int asm9260_wdt_gettimeleft(struct watchdog_device *wdd) 81aae03dc9SOleksij Rempel { 82aae03dc9SOleksij Rempel struct asm9260_wdt_priv *priv = watchdog_get_drvdata(wdd); 83aae03dc9SOleksij Rempel u32 counter; 84aae03dc9SOleksij Rempel 85aae03dc9SOleksij Rempel counter = ioread32(priv->iobase + HW_WDTV); 86aae03dc9SOleksij Rempel 87aae03dc9SOleksij Rempel return DIV_ROUND_CLOSEST(counter, priv->wdt_freq); 88aae03dc9SOleksij Rempel } 89aae03dc9SOleksij Rempel 90aae03dc9SOleksij Rempel static int asm9260_wdt_updatetimeout(struct watchdog_device *wdd) 91aae03dc9SOleksij Rempel { 92aae03dc9SOleksij Rempel struct asm9260_wdt_priv *priv = watchdog_get_drvdata(wdd); 93aae03dc9SOleksij Rempel u32 counter; 94aae03dc9SOleksij Rempel 95aae03dc9SOleksij Rempel counter = wdd->timeout * priv->wdt_freq; 96aae03dc9SOleksij Rempel 97aae03dc9SOleksij Rempel iowrite32(counter, priv->iobase + HW_WDTC); 98aae03dc9SOleksij Rempel 99aae03dc9SOleksij Rempel return 0; 100aae03dc9SOleksij Rempel } 101aae03dc9SOleksij Rempel 102aae03dc9SOleksij Rempel static int asm9260_wdt_enable(struct watchdog_device *wdd) 103aae03dc9SOleksij Rempel { 104aae03dc9SOleksij Rempel struct asm9260_wdt_priv *priv = watchdog_get_drvdata(wdd); 105aae03dc9SOleksij Rempel u32 mode = 0; 106aae03dc9SOleksij Rempel 107aae03dc9SOleksij Rempel if (priv->mode == HW_RESET) 108aae03dc9SOleksij Rempel mode = BM_MOD_WDRESET; 109aae03dc9SOleksij Rempel 110aae03dc9SOleksij Rempel iowrite32(BM_MOD_WDEN | mode, priv->iobase + HW_WDMOD); 111aae03dc9SOleksij Rempel 112aae03dc9SOleksij Rempel asm9260_wdt_updatetimeout(wdd); 113aae03dc9SOleksij Rempel 114aae03dc9SOleksij Rempel asm9260_wdt_feed(wdd); 115aae03dc9SOleksij Rempel 116aae03dc9SOleksij Rempel return 0; 117aae03dc9SOleksij Rempel } 118aae03dc9SOleksij Rempel 119aae03dc9SOleksij Rempel static int asm9260_wdt_disable(struct watchdog_device *wdd) 120aae03dc9SOleksij Rempel { 121aae03dc9SOleksij Rempel struct asm9260_wdt_priv *priv = watchdog_get_drvdata(wdd); 122aae03dc9SOleksij Rempel 123aae03dc9SOleksij Rempel /* The only way to disable WD is to reset it. */ 124aae03dc9SOleksij Rempel reset_control_assert(priv->rst); 125aae03dc9SOleksij Rempel reset_control_deassert(priv->rst); 126aae03dc9SOleksij Rempel 127aae03dc9SOleksij Rempel return 0; 128aae03dc9SOleksij Rempel } 129aae03dc9SOleksij Rempel 130aae03dc9SOleksij Rempel static int asm9260_wdt_settimeout(struct watchdog_device *wdd, unsigned int to) 131aae03dc9SOleksij Rempel { 132aae03dc9SOleksij Rempel wdd->timeout = to; 133aae03dc9SOleksij Rempel asm9260_wdt_updatetimeout(wdd); 134aae03dc9SOleksij Rempel 135aae03dc9SOleksij Rempel return 0; 136aae03dc9SOleksij Rempel } 137aae03dc9SOleksij Rempel 138aae03dc9SOleksij Rempel static void asm9260_wdt_sys_reset(struct asm9260_wdt_priv *priv) 139aae03dc9SOleksij Rempel { 140aae03dc9SOleksij Rempel /* init WD if it was not started */ 141aae03dc9SOleksij Rempel 142aae03dc9SOleksij Rempel iowrite32(BM_MOD_WDEN | BM_MOD_WDRESET, priv->iobase + HW_WDMOD); 143aae03dc9SOleksij Rempel 144aae03dc9SOleksij Rempel iowrite32(0xff, priv->iobase + HW_WDTC); 145aae03dc9SOleksij Rempel /* first pass correct sequence */ 146aae03dc9SOleksij Rempel asm9260_wdt_feed(&priv->wdd); 147aae03dc9SOleksij Rempel /* 148aae03dc9SOleksij Rempel * Then write wrong pattern to the feed to trigger reset 149aae03dc9SOleksij Rempel * ASAP. 150aae03dc9SOleksij Rempel */ 151aae03dc9SOleksij Rempel iowrite32(0xff, priv->iobase + HW_WDFEED); 152aae03dc9SOleksij Rempel 153aae03dc9SOleksij Rempel mdelay(1000); 154aae03dc9SOleksij Rempel } 155aae03dc9SOleksij Rempel 156aae03dc9SOleksij Rempel static irqreturn_t asm9260_wdt_irq(int irq, void *devid) 157aae03dc9SOleksij Rempel { 158aae03dc9SOleksij Rempel struct asm9260_wdt_priv *priv = devid; 159aae03dc9SOleksij Rempel u32 stat; 160aae03dc9SOleksij Rempel 161aae03dc9SOleksij Rempel stat = ioread32(priv->iobase + HW_WDMOD); 162aae03dc9SOleksij Rempel if (!(stat & BM_MOD_WDINT)) 163aae03dc9SOleksij Rempel return IRQ_NONE; 164aae03dc9SOleksij Rempel 165aae03dc9SOleksij Rempel if (priv->mode == DEBUG) { 166aae03dc9SOleksij Rempel dev_info(priv->dev, "Watchdog Timeout. Do nothing.\n"); 167aae03dc9SOleksij Rempel } else { 168aae03dc9SOleksij Rempel dev_info(priv->dev, "Watchdog Timeout. Doing SW Reset.\n"); 169aae03dc9SOleksij Rempel asm9260_wdt_sys_reset(priv); 170aae03dc9SOleksij Rempel } 171aae03dc9SOleksij Rempel 172aae03dc9SOleksij Rempel return IRQ_HANDLED; 173aae03dc9SOleksij Rempel } 174aae03dc9SOleksij Rempel 175aae03dc9SOleksij Rempel static int asm9260_restart_handler(struct notifier_block *this, 176aae03dc9SOleksij Rempel unsigned long mode, void *cmd) 177aae03dc9SOleksij Rempel { 178aae03dc9SOleksij Rempel struct asm9260_wdt_priv *priv = 179aae03dc9SOleksij Rempel container_of(this, struct asm9260_wdt_priv, restart_handler); 180aae03dc9SOleksij Rempel 181aae03dc9SOleksij Rempel asm9260_wdt_sys_reset(priv); 182aae03dc9SOleksij Rempel 183aae03dc9SOleksij Rempel return NOTIFY_DONE; 184aae03dc9SOleksij Rempel } 185aae03dc9SOleksij Rempel 186aae03dc9SOleksij Rempel static const struct watchdog_info asm9260_wdt_ident = { 187aae03dc9SOleksij Rempel .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING 188aae03dc9SOleksij Rempel | WDIOF_MAGICCLOSE, 189aae03dc9SOleksij Rempel .identity = "Alphascale asm9260 Watchdog", 190aae03dc9SOleksij Rempel }; 191aae03dc9SOleksij Rempel 192aae03dc9SOleksij Rempel static struct watchdog_ops asm9260_wdt_ops = { 193aae03dc9SOleksij Rempel .owner = THIS_MODULE, 194aae03dc9SOleksij Rempel .start = asm9260_wdt_enable, 195aae03dc9SOleksij Rempel .stop = asm9260_wdt_disable, 196aae03dc9SOleksij Rempel .get_timeleft = asm9260_wdt_gettimeleft, 197aae03dc9SOleksij Rempel .ping = asm9260_wdt_feed, 198aae03dc9SOleksij Rempel .set_timeout = asm9260_wdt_settimeout, 199aae03dc9SOleksij Rempel }; 200aae03dc9SOleksij Rempel 201*ac36856fSArnd Bergmann static int asm9260_wdt_get_dt_clks(struct asm9260_wdt_priv *priv) 202aae03dc9SOleksij Rempel { 203aae03dc9SOleksij Rempel int err; 204aae03dc9SOleksij Rempel unsigned long clk; 205aae03dc9SOleksij Rempel 206aae03dc9SOleksij Rempel priv->clk = devm_clk_get(priv->dev, "mod"); 207aae03dc9SOleksij Rempel if (IS_ERR(priv->clk)) { 208aae03dc9SOleksij Rempel dev_err(priv->dev, "Failed to get \"mod\" clk\n"); 209aae03dc9SOleksij Rempel return PTR_ERR(priv->clk); 210aae03dc9SOleksij Rempel } 211aae03dc9SOleksij Rempel 212aae03dc9SOleksij Rempel /* configure AHB clock */ 213aae03dc9SOleksij Rempel priv->clk_ahb = devm_clk_get(priv->dev, "ahb"); 214aae03dc9SOleksij Rempel if (IS_ERR(priv->clk_ahb)) { 215aae03dc9SOleksij Rempel dev_err(priv->dev, "Failed to get \"ahb\" clk\n"); 216aae03dc9SOleksij Rempel return PTR_ERR(priv->clk_ahb); 217aae03dc9SOleksij Rempel } 218aae03dc9SOleksij Rempel 219aae03dc9SOleksij Rempel err = clk_prepare_enable(priv->clk_ahb); 220aae03dc9SOleksij Rempel if (err) { 221aae03dc9SOleksij Rempel dev_err(priv->dev, "Failed to enable ahb_clk!\n"); 222aae03dc9SOleksij Rempel return err; 223aae03dc9SOleksij Rempel } 224aae03dc9SOleksij Rempel 225aae03dc9SOleksij Rempel err = clk_set_rate(priv->clk, CLOCK_FREQ); 226aae03dc9SOleksij Rempel if (err) { 227aae03dc9SOleksij Rempel clk_disable_unprepare(priv->clk_ahb); 228aae03dc9SOleksij Rempel dev_err(priv->dev, "Failed to set rate!\n"); 229aae03dc9SOleksij Rempel return err; 230aae03dc9SOleksij Rempel } 231aae03dc9SOleksij Rempel 232aae03dc9SOleksij Rempel err = clk_prepare_enable(priv->clk); 233aae03dc9SOleksij Rempel if (err) { 234aae03dc9SOleksij Rempel clk_disable_unprepare(priv->clk_ahb); 235aae03dc9SOleksij Rempel dev_err(priv->dev, "Failed to enable clk!\n"); 236aae03dc9SOleksij Rempel return err; 237aae03dc9SOleksij Rempel } 238aae03dc9SOleksij Rempel 239aae03dc9SOleksij Rempel /* wdt has internal divider */ 240aae03dc9SOleksij Rempel clk = clk_get_rate(priv->clk); 241aae03dc9SOleksij Rempel if (!clk) { 242aae03dc9SOleksij Rempel clk_disable_unprepare(priv->clk); 243aae03dc9SOleksij Rempel clk_disable_unprepare(priv->clk_ahb); 244aae03dc9SOleksij Rempel dev_err(priv->dev, "Failed, clk is 0!\n"); 245aae03dc9SOleksij Rempel return -EINVAL; 246aae03dc9SOleksij Rempel } 247aae03dc9SOleksij Rempel 248aae03dc9SOleksij Rempel priv->wdt_freq = clk / 2; 249aae03dc9SOleksij Rempel 250aae03dc9SOleksij Rempel return 0; 251aae03dc9SOleksij Rempel } 252aae03dc9SOleksij Rempel 253*ac36856fSArnd Bergmann static void asm9260_wdt_get_dt_mode(struct asm9260_wdt_priv *priv) 254aae03dc9SOleksij Rempel { 255aae03dc9SOleksij Rempel const char *tmp; 256aae03dc9SOleksij Rempel int ret; 257aae03dc9SOleksij Rempel 258aae03dc9SOleksij Rempel /* default mode */ 259aae03dc9SOleksij Rempel priv->mode = HW_RESET; 260aae03dc9SOleksij Rempel 261aae03dc9SOleksij Rempel ret = of_property_read_string(priv->dev->of_node, 262aae03dc9SOleksij Rempel "alphascale,mode", &tmp); 263aae03dc9SOleksij Rempel if (ret < 0) 264aae03dc9SOleksij Rempel return; 265aae03dc9SOleksij Rempel 266aae03dc9SOleksij Rempel if (!strcmp(tmp, "hw")) 267aae03dc9SOleksij Rempel priv->mode = HW_RESET; 268aae03dc9SOleksij Rempel else if (!strcmp(tmp, "sw")) 269aae03dc9SOleksij Rempel priv->mode = SW_RESET; 270aae03dc9SOleksij Rempel else if (!strcmp(tmp, "debug")) 271aae03dc9SOleksij Rempel priv->mode = DEBUG; 272aae03dc9SOleksij Rempel else 273aae03dc9SOleksij Rempel dev_warn(priv->dev, "unknown reset-type: %s. Using default \"hw\" mode.", 274aae03dc9SOleksij Rempel tmp); 275aae03dc9SOleksij Rempel } 276aae03dc9SOleksij Rempel 277*ac36856fSArnd Bergmann static int asm9260_wdt_probe(struct platform_device *pdev) 278aae03dc9SOleksij Rempel { 279aae03dc9SOleksij Rempel struct asm9260_wdt_priv *priv; 280aae03dc9SOleksij Rempel struct watchdog_device *wdd; 281aae03dc9SOleksij Rempel struct resource *res; 282aae03dc9SOleksij Rempel int ret; 283aae03dc9SOleksij Rempel const char * const mode_name[] = { "hw", "sw", "debug", }; 284aae03dc9SOleksij Rempel 285aae03dc9SOleksij Rempel priv = devm_kzalloc(&pdev->dev, sizeof(struct asm9260_wdt_priv), 286aae03dc9SOleksij Rempel GFP_KERNEL); 287aae03dc9SOleksij Rempel if (!priv) 288aae03dc9SOleksij Rempel return -ENOMEM; 289aae03dc9SOleksij Rempel 290aae03dc9SOleksij Rempel priv->dev = &pdev->dev; 291aae03dc9SOleksij Rempel 292aae03dc9SOleksij Rempel res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 293aae03dc9SOleksij Rempel priv->iobase = devm_ioremap_resource(&pdev->dev, res); 294aae03dc9SOleksij Rempel if (IS_ERR(priv->iobase)) 295aae03dc9SOleksij Rempel return PTR_ERR(priv->iobase); 296aae03dc9SOleksij Rempel 297aae03dc9SOleksij Rempel ret = asm9260_wdt_get_dt_clks(priv); 298aae03dc9SOleksij Rempel if (ret) 299aae03dc9SOleksij Rempel return ret; 300aae03dc9SOleksij Rempel 301aae03dc9SOleksij Rempel priv->rst = devm_reset_control_get(&pdev->dev, "wdt_rst"); 302aae03dc9SOleksij Rempel if (IS_ERR(priv->rst)) 303aae03dc9SOleksij Rempel return PTR_ERR(priv->rst); 304aae03dc9SOleksij Rempel 305aae03dc9SOleksij Rempel wdd = &priv->wdd; 306aae03dc9SOleksij Rempel wdd->info = &asm9260_wdt_ident; 307aae03dc9SOleksij Rempel wdd->ops = &asm9260_wdt_ops; 308aae03dc9SOleksij Rempel wdd->min_timeout = 1; 309aae03dc9SOleksij Rempel wdd->max_timeout = BM_WDTC_MAX(priv->wdt_freq); 310aae03dc9SOleksij Rempel wdd->parent = &pdev->dev; 311aae03dc9SOleksij Rempel 312aae03dc9SOleksij Rempel watchdog_set_drvdata(wdd, priv); 313aae03dc9SOleksij Rempel 314aae03dc9SOleksij Rempel /* 315aae03dc9SOleksij Rempel * If 'timeout-sec' unspecified in devicetree, assume a 30 second 316aae03dc9SOleksij Rempel * default, unless the max timeout is less than 30 seconds, then use 317aae03dc9SOleksij Rempel * the max instead. 318aae03dc9SOleksij Rempel */ 319aae03dc9SOleksij Rempel wdd->timeout = ASM9260_WDT_DEFAULT_TIMEOUT; 320aae03dc9SOleksij Rempel watchdog_init_timeout(wdd, 0, &pdev->dev); 321aae03dc9SOleksij Rempel 322aae03dc9SOleksij Rempel asm9260_wdt_get_dt_mode(priv); 323aae03dc9SOleksij Rempel 324aae03dc9SOleksij Rempel if (priv->mode != HW_RESET) 325aae03dc9SOleksij Rempel priv->irq = platform_get_irq(pdev, 0); 326aae03dc9SOleksij Rempel 327aae03dc9SOleksij Rempel if (priv->irq > 0) { 328aae03dc9SOleksij Rempel /* 329aae03dc9SOleksij Rempel * Not all supported platforms specify an interrupt for the 330aae03dc9SOleksij Rempel * watchdog, so let's make it optional. 331aae03dc9SOleksij Rempel */ 332aae03dc9SOleksij Rempel ret = devm_request_irq(&pdev->dev, priv->irq, 333aae03dc9SOleksij Rempel asm9260_wdt_irq, 0, pdev->name, priv); 334aae03dc9SOleksij Rempel if (ret < 0) 335aae03dc9SOleksij Rempel dev_warn(&pdev->dev, "failed to request IRQ\n"); 336aae03dc9SOleksij Rempel } 337aae03dc9SOleksij Rempel 338aae03dc9SOleksij Rempel ret = watchdog_register_device(wdd); 339aae03dc9SOleksij Rempel if (ret) 340aae03dc9SOleksij Rempel goto clk_off; 341aae03dc9SOleksij Rempel 342aae03dc9SOleksij Rempel platform_set_drvdata(pdev, priv); 343aae03dc9SOleksij Rempel 344aae03dc9SOleksij Rempel priv->restart_handler.notifier_call = asm9260_restart_handler; 345aae03dc9SOleksij Rempel priv->restart_handler.priority = 128; 346aae03dc9SOleksij Rempel ret = register_restart_handler(&priv->restart_handler); 347aae03dc9SOleksij Rempel if (ret) 348aae03dc9SOleksij Rempel dev_warn(&pdev->dev, "cannot register restart handler\n"); 349aae03dc9SOleksij Rempel 350aae03dc9SOleksij Rempel dev_info(&pdev->dev, "Watchdog enabled (timeout: %d sec, mode: %s)\n", 351aae03dc9SOleksij Rempel wdd->timeout, mode_name[priv->mode]); 352aae03dc9SOleksij Rempel return 0; 353aae03dc9SOleksij Rempel 354aae03dc9SOleksij Rempel clk_off: 355aae03dc9SOleksij Rempel clk_disable_unprepare(priv->clk); 356aae03dc9SOleksij Rempel clk_disable_unprepare(priv->clk_ahb); 357aae03dc9SOleksij Rempel return ret; 358aae03dc9SOleksij Rempel } 359aae03dc9SOleksij Rempel 360aae03dc9SOleksij Rempel static void asm9260_wdt_shutdown(struct platform_device *pdev) 361aae03dc9SOleksij Rempel { 362aae03dc9SOleksij Rempel struct asm9260_wdt_priv *priv = platform_get_drvdata(pdev); 363aae03dc9SOleksij Rempel 364aae03dc9SOleksij Rempel asm9260_wdt_disable(&priv->wdd); 365aae03dc9SOleksij Rempel } 366aae03dc9SOleksij Rempel 367*ac36856fSArnd Bergmann static int asm9260_wdt_remove(struct platform_device *pdev) 368aae03dc9SOleksij Rempel { 369aae03dc9SOleksij Rempel struct asm9260_wdt_priv *priv = platform_get_drvdata(pdev); 370aae03dc9SOleksij Rempel 371aae03dc9SOleksij Rempel asm9260_wdt_disable(&priv->wdd); 372aae03dc9SOleksij Rempel 373aae03dc9SOleksij Rempel unregister_restart_handler(&priv->restart_handler); 374aae03dc9SOleksij Rempel 375aae03dc9SOleksij Rempel watchdog_unregister_device(&priv->wdd); 376aae03dc9SOleksij Rempel 377aae03dc9SOleksij Rempel clk_disable_unprepare(priv->clk); 378aae03dc9SOleksij Rempel clk_disable_unprepare(priv->clk_ahb); 379aae03dc9SOleksij Rempel 380aae03dc9SOleksij Rempel return 0; 381aae03dc9SOleksij Rempel } 382aae03dc9SOleksij Rempel 383aae03dc9SOleksij Rempel static const struct of_device_id asm9260_wdt_of_match[] = { 384aae03dc9SOleksij Rempel { .compatible = "alphascale,asm9260-wdt"}, 385aae03dc9SOleksij Rempel {}, 386aae03dc9SOleksij Rempel }; 387aae03dc9SOleksij Rempel MODULE_DEVICE_TABLE(of, asm9260_wdt_of_match); 388aae03dc9SOleksij Rempel 389aae03dc9SOleksij Rempel static struct platform_driver asm9260_wdt_driver = { 390aae03dc9SOleksij Rempel .driver = { 391aae03dc9SOleksij Rempel .name = "asm9260-wdt", 392aae03dc9SOleksij Rempel .owner = THIS_MODULE, 393aae03dc9SOleksij Rempel .of_match_table = asm9260_wdt_of_match, 394aae03dc9SOleksij Rempel }, 395aae03dc9SOleksij Rempel .probe = asm9260_wdt_probe, 396aae03dc9SOleksij Rempel .remove = asm9260_wdt_remove, 397aae03dc9SOleksij Rempel .shutdown = asm9260_wdt_shutdown, 398aae03dc9SOleksij Rempel }; 399aae03dc9SOleksij Rempel module_platform_driver(asm9260_wdt_driver); 400aae03dc9SOleksij Rempel 401aae03dc9SOleksij Rempel MODULE_DESCRIPTION("asm9260 WatchDog Timer Driver"); 402aae03dc9SOleksij Rempel MODULE_AUTHOR("Oleksij Rempel <linux@rempel-privat.de>"); 403aae03dc9SOleksij Rempel MODULE_LICENSE("GPL"); 404