brintos

brintos / linux-shallow public Read only

0
0
Text · 16.9 KiB · 6a16d3d Raw
669 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/***************************************************************************3 *   Copyright (C) 2006 by Hans Edgington <hans@edgington.nl>              *4 *   Copyright (C) 2007-2009 Hans de Goede <hdegoede@redhat.com>           *5 *   Copyright (C) 2010 Giel van Schijndel <me@mortis.eu>                  *6 *                                                                         *7 ***************************************************************************/8 9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt10 11#include <linux/err.h>12#include <linux/init.h>13#include <linux/io.h>14#include <linux/ioport.h>15#include <linux/module.h>16#include <linux/platform_device.h>17#include <linux/watchdog.h>18 19#define DRVNAME "f71808e_wdt"20 21#define SIO_F71808FG_LD_WDT	0x07	/* Watchdog timer logical device */22#define SIO_UNLOCK_KEY		0x87	/* Key to enable Super-I/O */23#define SIO_LOCK_KEY		0xAA	/* Key to disable Super-I/O */24 25#define SIO_REG_LDSEL		0x07	/* Logical device select */26#define SIO_REG_DEVID		0x20	/* Device ID (2 bytes) */27#define SIO_REG_DEVREV		0x22	/* Device revision */28#define SIO_REG_MANID		0x23	/* Fintek ID (2 bytes) */29#define SIO_REG_CLOCK_SEL	0x26	/* Clock select */30#define SIO_REG_ROM_ADDR_SEL	0x27	/* ROM address select */31#define SIO_F81866_REG_PORT_SEL	0x27	/* F81866 Multi-Function Register */32#define SIO_REG_TSI_LEVEL_SEL	0x28	/* TSI Level select */33#define SIO_REG_MFUNCT1		0x29	/* Multi function select 1 */34#define SIO_REG_MFUNCT2		0x2a	/* Multi function select 2 */35#define SIO_REG_MFUNCT3		0x2b	/* Multi function select 3 */36#define SIO_F81866_REG_GPIO1	0x2c	/* F81866 GPIO1 Enable Register */37#define SIO_REG_ENABLE		0x30	/* Logical device enable */38#define SIO_REG_ADDR		0x60	/* Logical device address (2 bytes) */39 40#define SIO_FINTEK_ID		0x1934	/* Manufacturers ID */41#define SIO_F71808_ID		0x0901	/* Chipset ID */42#define SIO_F71858_ID		0x0507	/* Chipset ID */43#define SIO_F71862_ID		0x0601	/* Chipset ID */44#define SIO_F71868_ID		0x1106	/* Chipset ID */45#define SIO_F71869_ID		0x0814	/* Chipset ID */46#define SIO_F71869A_ID		0x1007	/* Chipset ID */47#define SIO_F71882_ID		0x0541	/* Chipset ID */48#define SIO_F71889_ID		0x0723	/* Chipset ID */49#define SIO_F81803_ID		0x1210	/* Chipset ID */50#define SIO_F81865_ID		0x0704	/* Chipset ID */51#define SIO_F81866_ID		0x1010	/* Chipset ID */52#define SIO_F81966_ID		0x1502  /* F81804 chipset ID, same for f81966 */53 54#define F71808FG_REG_WDO_CONF		0xf055#define F71808FG_REG_WDT_CONF		0xf556#define F71808FG_REG_WD_TIME		0xf657 58#define F71808FG_FLAG_WDOUT_EN		759 60#define F71808FG_FLAG_WDTMOUT_STS	661#define F71808FG_FLAG_WD_EN		562#define F71808FG_FLAG_WD_PULSE		463#define F71808FG_FLAG_WD_UNIT		364 65#define F81865_REG_WDO_CONF		0xfa66#define F81865_FLAG_WDOUT_EN		067 68/* Default values */69#define WATCHDOG_TIMEOUT	60	/* 1 minute default timeout */70#define WATCHDOG_MAX_TIMEOUT	(60 * 255)71#define WATCHDOG_PULSE_WIDTH	125	/* 125 ms, default pulse width for72					   watchdog signal */73#define WATCHDOG_F71862FG_PIN	63	/* default watchdog reset output74					   pin number 63 */75 76static unsigned short force_id;77module_param(force_id, ushort, 0);78MODULE_PARM_DESC(force_id, "Override the detected device ID");79 80static int timeout = WATCHDOG_TIMEOUT;	/* default timeout in seconds */81module_param(timeout, int, 0);82MODULE_PARM_DESC(timeout,83	"Watchdog timeout in seconds. 1<= timeout <="84			__MODULE_STRING(WATCHDOG_MAX_TIMEOUT) " (default="85			__MODULE_STRING(WATCHDOG_TIMEOUT) ")");86 87static unsigned int pulse_width = WATCHDOG_PULSE_WIDTH;88module_param(pulse_width, uint, 0);89MODULE_PARM_DESC(pulse_width,90	"Watchdog signal pulse width. 0(=level), 1, 25, 30, 125, 150, 5000 or 6000 ms"91			" (default=" __MODULE_STRING(WATCHDOG_PULSE_WIDTH) ")");92 93static unsigned int f71862fg_pin = WATCHDOG_F71862FG_PIN;94module_param(f71862fg_pin, uint, 0);95MODULE_PARM_DESC(f71862fg_pin,96	"Watchdog f71862fg reset output pin configuration. Choose pin 56 or 63"97			" (default=" __MODULE_STRING(WATCHDOG_F71862FG_PIN)")");98 99static bool nowayout = WATCHDOG_NOWAYOUT;100module_param(nowayout, bool, 0444);101MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");102 103static unsigned int start_withtimeout;104module_param(start_withtimeout, uint, 0);105MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with"106	" given initial timeout. Zero (default) disables this feature.");107 108enum chips { f71808fg, f71858fg, f71862fg, f71868, f71869, f71882fg, f71889fg,109	     f81803, f81865, f81866, f81966};110 111static const char * const fintek_wdt_names[] = {112	"f71808fg",113	"f71858fg",114	"f71862fg",115	"f71868",116	"f71869",117	"f71882fg",118	"f71889fg",119	"f81803",120	"f81865",121	"f81866",122	"f81966"123};124 125/* Super-I/O Function prototypes */126static inline int superio_inb(int base, int reg);127static inline int superio_inw(int base, int reg);128static inline void superio_outb(int base, int reg, u8 val);129static inline void superio_set_bit(int base, int reg, int bit);130static inline void superio_clear_bit(int base, int reg, int bit);131static inline int superio_enter(int base);132static inline void superio_select(int base, int ld);133static inline void superio_exit(int base);134 135struct fintek_wdt {136	struct watchdog_device wdd;137	unsigned short	sioaddr;138	enum chips	type;139	struct watchdog_info ident;140 141	u8		timer_val;	/* content for the wd_time register */142	char		minutes_mode;143	u8		pulse_val;	/* pulse width flag */144	char		pulse_mode;	/* enable pulse output mode? */145};146 147struct fintek_wdt_pdata {148	enum chips	type;149};150 151/* Super I/O functions */152static inline int superio_inb(int base, int reg)153{154	outb(reg, base);155	return inb(base + 1);156}157 158static int superio_inw(int base, int reg)159{160	int val;161	val  = superio_inb(base, reg) << 8;162	val |= superio_inb(base, reg + 1);163	return val;164}165 166static inline void superio_outb(int base, int reg, u8 val)167{168	outb(reg, base);169	outb(val, base + 1);170}171 172static inline void superio_set_bit(int base, int reg, int bit)173{174	unsigned long val = superio_inb(base, reg);175	__set_bit(bit, &val);176	superio_outb(base, reg, val);177}178 179static inline void superio_clear_bit(int base, int reg, int bit)180{181	unsigned long val = superio_inb(base, reg);182	__clear_bit(bit, &val);183	superio_outb(base, reg, val);184}185 186static inline int superio_enter(int base)187{188	/* Don't step on other drivers' I/O space by accident */189	if (!request_muxed_region(base, 2, DRVNAME)) {190		pr_err("I/O address 0x%04x already in use\n", (int)base);191		return -EBUSY;192	}193 194	/* according to the datasheet the key must be sent twice! */195	outb(SIO_UNLOCK_KEY, base);196	outb(SIO_UNLOCK_KEY, base);197 198	return 0;199}200 201static inline void superio_select(int base, int ld)202{203	outb(SIO_REG_LDSEL, base);204	outb(ld, base + 1);205}206 207static inline void superio_exit(int base)208{209	outb(SIO_LOCK_KEY, base);210	release_region(base, 2);211}212 213static int fintek_wdt_set_timeout(struct watchdog_device *wdd, unsigned int timeout)214{215	struct fintek_wdt *wd = watchdog_get_drvdata(wdd);216 217	if (timeout > 0xff) {218		wd->timer_val = DIV_ROUND_UP(timeout, 60);219		wd->minutes_mode = true;220		timeout = wd->timer_val * 60;221	} else {222		wd->timer_val = timeout;223		wd->minutes_mode = false;224	}225 226	wdd->timeout = timeout;227 228	return 0;229}230 231static int fintek_wdt_set_pulse_width(struct fintek_wdt *wd, unsigned int pw)232{233	unsigned int t1 = 25, t2 = 125, t3 = 5000;234 235	if (wd->type == f71868) {236		t1 = 30;237		t2 = 150;238		t3 = 6000;239	}240 241	if        (pw <=  1) {242		wd->pulse_val = 0;243	} else if (pw <= t1) {244		wd->pulse_val = 1;245	} else if (pw <= t2) {246		wd->pulse_val = 2;247	} else if (pw <= t3) {248		wd->pulse_val = 3;249	} else {250		pr_err("pulse width out of range\n");251		return -EINVAL;252	}253 254	wd->pulse_mode = pw;255 256	return 0;257}258 259static int fintek_wdt_keepalive(struct watchdog_device *wdd)260{261	struct fintek_wdt *wd = watchdog_get_drvdata(wdd);262	int err;263 264	err = superio_enter(wd->sioaddr);265	if (err)266		return err;267	superio_select(wd->sioaddr, SIO_F71808FG_LD_WDT);268 269	if (wd->minutes_mode)270		/* select minutes for timer units */271		superio_set_bit(wd->sioaddr, F71808FG_REG_WDT_CONF,272				F71808FG_FLAG_WD_UNIT);273	else274		/* select seconds for timer units */275		superio_clear_bit(wd->sioaddr, F71808FG_REG_WDT_CONF,276				F71808FG_FLAG_WD_UNIT);277 278	/* Set timer value */279	superio_outb(wd->sioaddr, F71808FG_REG_WD_TIME,280			   wd->timer_val);281 282	superio_exit(wd->sioaddr);283 284	return 0;285}286 287static int fintek_wdt_start(struct watchdog_device *wdd)288{289	struct fintek_wdt *wd = watchdog_get_drvdata(wdd);290	int err;291	u8 tmp;292 293	/* Make sure we don't die as soon as the watchdog is enabled below */294	err = fintek_wdt_keepalive(wdd);295	if (err)296		return err;297 298	err = superio_enter(wd->sioaddr);299	if (err)300		return err;301	superio_select(wd->sioaddr, SIO_F71808FG_LD_WDT);302 303	/* Watchdog pin configuration */304	switch (wd->type) {305	case f71808fg:306		/* Set pin 21 to GPIO23/WDTRST#, then to WDTRST# */307		superio_clear_bit(wd->sioaddr, SIO_REG_MFUNCT2, 3);308		superio_clear_bit(wd->sioaddr, SIO_REG_MFUNCT3, 3);309		break;310 311	case f71862fg:312		if (f71862fg_pin == 63) {313			/* SPI must be disabled first to use this pin! */314			superio_clear_bit(wd->sioaddr, SIO_REG_ROM_ADDR_SEL, 6);315			superio_set_bit(wd->sioaddr, SIO_REG_MFUNCT3, 4);316		} else if (f71862fg_pin == 56) {317			superio_set_bit(wd->sioaddr, SIO_REG_MFUNCT1, 1);318		}319		break;320 321	case f71868:322	case f71869:323		/* GPIO14 --> WDTRST# */324		superio_clear_bit(wd->sioaddr, SIO_REG_MFUNCT1, 4);325		break;326 327	case f71882fg:328		/* Set pin 56 to WDTRST# */329		superio_set_bit(wd->sioaddr, SIO_REG_MFUNCT1, 1);330		break;331 332	case f71889fg:333		/* set pin 40 to WDTRST# */334		superio_outb(wd->sioaddr, SIO_REG_MFUNCT3,335			superio_inb(wd->sioaddr, SIO_REG_MFUNCT3) & 0xcf);336		break;337 338	case f81803:339		/* Enable TSI Level register bank */340		superio_clear_bit(wd->sioaddr, SIO_REG_CLOCK_SEL, 3);341		/* Set pin 27 to WDTRST# */342		superio_outb(wd->sioaddr, SIO_REG_TSI_LEVEL_SEL, 0x5f &343			superio_inb(wd->sioaddr, SIO_REG_TSI_LEVEL_SEL));344		break;345 346	case f81865:347		/* Set pin 70 to WDTRST# */348		superio_clear_bit(wd->sioaddr, SIO_REG_MFUNCT3, 5);349		break;350 351	case f81866:352	case f81966:353		/*354		 * GPIO1 Control Register when 27h BIT3:2 = 01 & BIT0 = 0.355		 * The PIN 70(GPIO15/WDTRST) is controlled by 2Ch:356		 *     BIT5: 0 -> WDTRST#357		 *           1 -> GPIO15358		 */359		tmp = superio_inb(wd->sioaddr, SIO_F81866_REG_PORT_SEL);360		tmp &= ~(BIT(3) | BIT(0));361		tmp |= BIT(2);362		superio_outb(wd->sioaddr, SIO_F81866_REG_PORT_SEL, tmp);363 364		superio_clear_bit(wd->sioaddr, SIO_F81866_REG_GPIO1, 5);365		break;366 367	default:368		/*369		 * 'default' label to shut up the compiler and catch370		 * programmer errors371		 */372		err = -ENODEV;373		goto exit_superio;374	}375 376	superio_select(wd->sioaddr, SIO_F71808FG_LD_WDT);377	superio_set_bit(wd->sioaddr, SIO_REG_ENABLE, 0);378 379	if (wd->type == f81865 || wd->type == f81866 || wd->type == f81966)380		superio_set_bit(wd->sioaddr, F81865_REG_WDO_CONF,381				F81865_FLAG_WDOUT_EN);382	else383		superio_set_bit(wd->sioaddr, F71808FG_REG_WDO_CONF,384				F71808FG_FLAG_WDOUT_EN);385 386	superio_set_bit(wd->sioaddr, F71808FG_REG_WDT_CONF,387			F71808FG_FLAG_WD_EN);388 389	if (wd->pulse_mode) {390		/* Select "pulse" output mode with given duration */391		u8 wdt_conf = superio_inb(wd->sioaddr,392				F71808FG_REG_WDT_CONF);393 394		/* Set WD_PSWIDTH bits (1:0) */395		wdt_conf = (wdt_conf & 0xfc) | (wd->pulse_val & 0x03);396		/* Set WD_PULSE to "pulse" mode */397		wdt_conf |= BIT(F71808FG_FLAG_WD_PULSE);398 399		superio_outb(wd->sioaddr, F71808FG_REG_WDT_CONF,400				wdt_conf);401	} else {402		/* Select "level" output mode */403		superio_clear_bit(wd->sioaddr, F71808FG_REG_WDT_CONF,404				F71808FG_FLAG_WD_PULSE);405	}406 407exit_superio:408	superio_exit(wd->sioaddr);409 410	return err;411}412 413static int fintek_wdt_stop(struct watchdog_device *wdd)414{415	struct fintek_wdt *wd = watchdog_get_drvdata(wdd);416	int err;417 418	err = superio_enter(wd->sioaddr);419	if (err)420		return err;421	superio_select(wd->sioaddr, SIO_F71808FG_LD_WDT);422 423	superio_clear_bit(wd->sioaddr, F71808FG_REG_WDT_CONF,424			F71808FG_FLAG_WD_EN);425 426	superio_exit(wd->sioaddr);427 428	return 0;429}430 431static bool fintek_wdt_is_running(struct fintek_wdt *wd, u8 wdt_conf)432{433	return (superio_inb(wd->sioaddr, SIO_REG_ENABLE) & BIT(0))434		&& (wdt_conf & BIT(F71808FG_FLAG_WD_EN));435}436 437static const struct watchdog_ops fintek_wdt_ops = {438	.owner = THIS_MODULE,439	.start = fintek_wdt_start,440	.stop = fintek_wdt_stop,441	.ping = fintek_wdt_keepalive,442	.set_timeout = fintek_wdt_set_timeout,443};444 445static int fintek_wdt_probe(struct platform_device *pdev)446{447	struct device *dev = &pdev->dev;448	struct fintek_wdt_pdata *pdata;449	struct watchdog_device *wdd;450	struct fintek_wdt *wd;451	int wdt_conf, err = 0;452	struct resource *res;453	int sioaddr;454 455	res = platform_get_resource(pdev, IORESOURCE_IO, 0);456	if (!res)457		return -ENXIO;458 459	sioaddr = res->start;460 461	wd = devm_kzalloc(dev, sizeof(*wd), GFP_KERNEL);462	if (!wd)463		return -ENOMEM;464 465	pdata = dev->platform_data;466 467	wd->type = pdata->type;468	wd->sioaddr = sioaddr;469	wd->ident.options = WDIOF_SETTIMEOUT470			| WDIOF_MAGICCLOSE471			| WDIOF_KEEPALIVEPING472			| WDIOF_CARDRESET;473 474	snprintf(wd->ident.identity,475		sizeof(wd->ident.identity), "%s watchdog",476		fintek_wdt_names[wd->type]);477 478	err = superio_enter(sioaddr);479	if (err)480		return err;481	superio_select(wd->sioaddr, SIO_F71808FG_LD_WDT);482 483	wdt_conf = superio_inb(sioaddr, F71808FG_REG_WDT_CONF);484 485	/*486	 * We don't want WDTMOUT_STS to stick around till regular reboot.487	 * Write 1 to the bit to clear it to zero.488	 */489	superio_outb(sioaddr, F71808FG_REG_WDT_CONF,490		     wdt_conf | BIT(F71808FG_FLAG_WDTMOUT_STS));491 492	wdd = &wd->wdd;493 494	if (fintek_wdt_is_running(wd, wdt_conf))495		set_bit(WDOG_HW_RUNNING, &wdd->status);496 497	superio_exit(sioaddr);498 499	wdd->parent		= dev;500	wdd->info               = &wd->ident;501	wdd->ops                = &fintek_wdt_ops;502	wdd->min_timeout        = 1;503	wdd->max_timeout        = WATCHDOG_MAX_TIMEOUT;504 505	watchdog_set_drvdata(wdd, wd);506	watchdog_set_nowayout(wdd, nowayout);507	watchdog_stop_on_unregister(wdd);508	watchdog_stop_on_reboot(wdd);509	watchdog_init_timeout(wdd, start_withtimeout ?: timeout, NULL);510 511	if (wdt_conf & BIT(F71808FG_FLAG_WDTMOUT_STS))512		wdd->bootstatus = WDIOF_CARDRESET;513 514	/*515	 * WATCHDOG_HANDLE_BOOT_ENABLED can result in keepalive being directly516	 * called without a set_timeout before, so it needs to be done here517	 * unconditionally.518	 */519	fintek_wdt_set_timeout(wdd, wdd->timeout);520	fintek_wdt_set_pulse_width(wd, pulse_width);521 522	if (start_withtimeout) {523		err = fintek_wdt_start(wdd);524		if (err) {525			dev_err(dev, "cannot start watchdog timer\n");526			return err;527		}528 529		set_bit(WDOG_HW_RUNNING, &wdd->status);530		dev_info(dev, "watchdog started with initial timeout of %u sec\n",531			 start_withtimeout);532	}533 534	return devm_watchdog_register_device(dev, wdd);535}536 537static int __init fintek_wdt_find(int sioaddr)538{539	enum chips type;540	u16 devid;541	int err = superio_enter(sioaddr);542	if (err)543		return err;544 545	devid = superio_inw(sioaddr, SIO_REG_MANID);546	if (devid != SIO_FINTEK_ID) {547		pr_debug("Not a Fintek device\n");548		err = -ENODEV;549		goto exit;550	}551 552	devid = force_id ? force_id : superio_inw(sioaddr, SIO_REG_DEVID);553	switch (devid) {554	case SIO_F71808_ID:555		type = f71808fg;556		break;557	case SIO_F71862_ID:558		type = f71862fg;559		break;560	case SIO_F71868_ID:561		type = f71868;562		break;563	case SIO_F71869_ID:564	case SIO_F71869A_ID:565		type = f71869;566		break;567	case SIO_F71882_ID:568		type = f71882fg;569		break;570	case SIO_F71889_ID:571		type = f71889fg;572		break;573	case SIO_F71858_ID:574		/* Confirmed (by datasheet) not to have a watchdog. */575		err = -ENODEV;576		goto exit;577	case SIO_F81803_ID:578		type = f81803;579		break;580	case SIO_F81865_ID:581		type = f81865;582		break;583	case SIO_F81866_ID:584		type = f81866;585		break;586	case SIO_F81966_ID:587		type = f81966;588		break;589	default:590		pr_info("Unrecognized Fintek device: %04x\n",591			(unsigned int)devid);592		err = -ENODEV;593		goto exit;594	}595 596	pr_info("Found %s watchdog chip, revision %d\n",597		fintek_wdt_names[type],598		(int)superio_inb(sioaddr, SIO_REG_DEVREV));599 600exit:601	superio_exit(sioaddr);602	return err ? err : type;603}604 605static struct platform_driver fintek_wdt_driver = {606	.probe          = fintek_wdt_probe,607	.driver         = {608		.name   = DRVNAME,609	},610};611 612static struct platform_device *fintek_wdt_pdev;613 614static int __init fintek_wdt_init(void)615{616	static const unsigned short addrs[] = { 0x2e, 0x4e };617	struct fintek_wdt_pdata pdata;618	struct resource wdt_res = {};619	int ret;620	int i;621 622	if (f71862fg_pin != 63 && f71862fg_pin != 56) {623		pr_err("Invalid argument f71862fg_pin=%d\n", f71862fg_pin);624		return -EINVAL;625	}626 627	for (i = 0; i < ARRAY_SIZE(addrs); i++) {628		ret = fintek_wdt_find(addrs[i]);629		if (ret >= 0)630			break;631	}632	if (i == ARRAY_SIZE(addrs))633		return ret;634 635	pdata.type = ret;636 637	ret = platform_driver_register(&fintek_wdt_driver);638	if (ret)639		return ret;640 641	wdt_res.name = "superio port";642	wdt_res.flags = IORESOURCE_IO;643	wdt_res.start = addrs[i];644	wdt_res.end   = addrs[i] + 1;645 646	fintek_wdt_pdev = platform_device_register_resndata(NULL, DRVNAME, -1,647							    &wdt_res, 1,648							    &pdata, sizeof(pdata));649	if (IS_ERR(fintek_wdt_pdev)) {650		platform_driver_unregister(&fintek_wdt_driver);651		return PTR_ERR(fintek_wdt_pdev);652	}653 654	return 0;655}656 657static void __exit fintek_wdt_exit(void)658{659	platform_device_unregister(fintek_wdt_pdev);660	platform_driver_unregister(&fintek_wdt_driver);661}662 663MODULE_DESCRIPTION("F71808E Watchdog Driver");664MODULE_AUTHOR("Giel van Schijndel <me@mortis.eu>");665MODULE_LICENSE("GPL");666 667module_init(fintek_wdt_init);668module_exit(fintek_wdt_exit);669