drivers/watchdog/pc87413_wdt.c

1 // SPDX-License-Identifier: GPL-2.0+
3  *      NS pc87413-wdt Watchdog Timer driver for Linux 2.6.x.x
5  *      This code is based on wdt.c with original copyright.
12  *      This material is provided "AS-IS" and at no charge.
41 #define MODNAME             "pc87413 WDT"
42 #define DPFX                MODNAME " - DEBUG: "
48 #define WDCTL               0x10	/* Watchdog-Timer-Control-Register */
55 static int swc_base_addr = -1;
66 /* -- Low level function ----------------------------------------*/
74 	/* Step 1: Select multiple pin,pin55,as WDT output */  in pc87413_select_wdt_out()
87 		"Select multiple pin,pin55,as WDT output: Bit7 to 1: %d\n",  in pc87413_select_wdt_out()
92 /* Enable SWC functions */
98 	/* Step 2: Enable SWC functions */  in pc87413_enable_swc()
110 	pr_info(DPFX "pc87413 - Enable SWC functions\n");  in pc87413_enable_swc()
159 /* Enable WDEN */
163 	/* Step 6: Enable WDEN */  in pc87413_enable_wden()
166 	pr_info(DPFX "Enable WDEN\n");  in pc87413_enable_wden()
170 /* Enable SW_WD_TREN */
173 	/* Enable SW_WD_TREN */  in pc87413_enable_sw_wd_tren()
176 	pr_info(DPFX "Enable SW_WD_TREN\n");  in pc87413_enable_sw_wd_tren()
187 	pr_info(DPFX "pc87413 - Disable SW_WD_TREN\n");  in pc87413_disable_sw_wd_tren()
191 /* Enable SW_WD_TRG */
195 	/* Enable SW_WD_TRG */  in pc87413_enable_sw_wd_trg()
198 	pr_info(DPFX "pc87413 - Enable SW_WD_TRG\n");  in pc87413_enable_sw_wd_trg()
213 /* -- Higher level functions ------------------------------------*/
215 /* Enable the watchdog */
261 /* -- File operations -------------------------------------------*/
272 	/* /dev/watchdog can only be opened once */  in pc87413_open()
275 		return -EBUSY;  in pc87413_open()
355 					return -EFAULT;  in pc87413_write()
401 					sizeof(ident)) ? -EFAULT : 0;  in pc87413_ioctl()
408 		int options, retval = -EINVAL;  in pc87413_ioctl()
410 			return -EFAULT;  in pc87413_ioctl()
429 			return -EFAULT;  in pc87413_ioctl()
433 			return -EINVAL;  in pc87413_ioctl()
441 		return -ENOTTY;  in pc87413_ioctl()
445 /* -- Notifier functions -----------------------------------------*/
456  *	trust me - if it happens it does suck.
469 /* -- Module's structures ---------------------------------------*/
490 /* -- Module init functions -------------------------------------*/
495  *	Set up the WDT watchdog board. All we have to do is grab the
508 		return -EBUSY;  in pc87413_init()
528 		ret = -EBUSY;  in pc87413_init()
575 MODULE_DESCRIPTION("PC87413 WDT driver");
589 		"Watchdog cannot be stopped once started (default="