1 // SPDX-License-Identifier: GPL-2.0-only
5  *				- AF82MP20 PCH
7  *      Copyright (C) 2009-2010 Intel Corporation. All rights reserved.
35 #include <asm/intel-mid.h>
45 static int timer_margin = DEFAULT_SOFT_TO_HARD_MARGIN;
46 module_param(timer_margin, int, 0);
53 static int timer_set = DEFAULT_TIME;
54 module_param(timer_set, int, 0);
65 static int force_boot;
66 module_param(force_boot, int, 0);
96 static int check_timer_margin(int new_margin)  in check_timer_margin()
99 	    (new_margin > MAX_TIME - timer_set)) {  in check_timer_margin()
101 			 new_margin, MIN_TIME_CYCLE, MAX_TIME - timer_set);  in check_timer_margin()
102 		return -EINVAL;  in check_timer_margin()
110 static int watchdog_set_ipc(int soft_threshold, int threshold)  in watchdog_set_ipc()  argument
114 	int	 ipc_ret = 0;  in watchdog_set_ipc()
118 	ipc_wbuf[1] = threshold;  in watchdog_set_ipc()
139 static irqreturn_t watchdog_timer_interrupt(int irq, void *dev_id)  in watchdog_timer_interrupt()
141 	int int_status;  in watchdog_timer_interrupt()
158 	/* set the timer to the threshold */  in watchdog_timer_interrupt()
159 	iowrite32(watchdog_device.threshold,  in watchdog_timer_interrupt()
168 static int intel_scu_keepalive(void)  in intel_scu_keepalive()
171 	/* read eoi register - clears interrupt */  in intel_scu_keepalive()
187 static int intel_scu_stop(void)  in intel_scu_stop()
193 static int intel_scu_set_heartbeat(u32 t)  in intel_scu_set_heartbeat()
195 	int			 ipc_ret;  in intel_scu_set_heartbeat()
196 	int			 retry_count;  in intel_scu_set_heartbeat()
201 	watchdog_device.threshold =  in intel_scu_set_heartbeat()
202 		timer_margin * watchdog_device.timer_tbl_ptr->freq_hz;  in intel_scu_set_heartbeat()
204 		(watchdog_device.timer_set - timer_margin)  in intel_scu_set_heartbeat()
205 		* watchdog_device.timer_tbl_ptr->freq_hz;  in intel_scu_set_heartbeat()
208 		 watchdog_device.timer_tbl_ptr->freq_hz);  in intel_scu_set_heartbeat()
212 	pr_debug("set_heartbeat: threshold is %x (hex)\n",  in intel_scu_set_heartbeat()
213 		 watchdog_device.threshold);  in intel_scu_set_heartbeat()
219 	watchdog_device.threshold =  in intel_scu_set_heartbeat()
220 		watchdog_device.threshold / FREQ_ADJUSTMENT;  in intel_scu_set_heartbeat()
227 	/* send the threshold and soft_threshold via IPC to the processor */  in intel_scu_set_heartbeat()
229 				   watchdog_device.threshold);  in intel_scu_set_heartbeat()
237 	/* Soft Threshold set loop. Early versions of silicon did */  in intel_scu_set_heartbeat()
251 			return -ENODEV;  in intel_scu_set_heartbeat()
254 		/* set the timer to the soft threshold */  in intel_scu_set_heartbeat()
280 static int intel_scu_open(struct inode *inode, struct file *file)  in intel_scu_open()
285 		return -EBUSY;  in intel_scu_open()
289 		return -EPERM;  in intel_scu_open()
294 static int intel_scu_release(struct inode *inode, struct file *file)  in intel_scu_release()
307 		return -ENOTTY;  in intel_scu_release()
348 			   unsigned int cmd,  in intel_scu_ioctl()
368 				    sizeof(ident)) ? -EFAULT : 0;  in intel_scu_ioctl()
378 			return -EFAULT;  in intel_scu_ioctl()
381 			return -EINVAL;  in intel_scu_ioctl()
384 			return -EINVAL;  in intel_scu_ioctl()
390 		return -ENOTTY;  in intel_scu_ioctl()
397 static int intel_scu_notify_sys(struct notifier_block *this,  in intel_scu_notify_sys()
420 static int __init intel_scu_watchdog_init(void)  in intel_scu_watchdog_init()
422 	int ret;  in intel_scu_watchdog_init()
432 		return -ENODEV;  in intel_scu_watchdog_init()
438 	    (timer_set > MAX_TIME - MIN_TIME_CYCLE)) {  in intel_scu_watchdog_init()
440 		       timer_set, MIN_TIME_CYCLE, MAX_TIME - MIN_TIME_CYCLE);  in intel_scu_watchdog_init()
441 		return -EINVAL;  in intel_scu_watchdog_init()
446 		return -EINVAL;  in intel_scu_watchdog_init()
448 	watchdog_device.timer_tbl_ptr = sfi_get_mtmr(sfi_mtimer_num-1);  in intel_scu_watchdog_init()
452 		return -ENODEV;  in intel_scu_watchdog_init()
455 	if (watchdog_device.timer_tbl_ptr->phys_addr == 0) {  in intel_scu_watchdog_init()
458 		return -ENODEV;  in intel_scu_watchdog_init()
461 	if (watchdog_device.timer_tbl_ptr->irq == 0) {  in intel_scu_watchdog_init()
463 		return -ENODEV;  in intel_scu_watchdog_init()
466 	tmp_addr = ioremap(watchdog_device.timer_tbl_ptr->phys_addr,  in intel_scu_watchdog_init()
471 		return -ENOMEM;  in intel_scu_watchdog_init()
483 	watchdog_device.threshold =  in intel_scu_watchdog_init()
484 		timer_margin * watchdog_device.timer_tbl_ptr->freq_hz;  in intel_scu_watchdog_init()
486 		(watchdog_device.timer_set - timer_margin)  in intel_scu_watchdog_init()
487 		* watchdog_device.timer_tbl_ptr->freq_hz;  in intel_scu_watchdog_init()
510 	ret = request_irq((unsigned int)watchdog_device.timer_tbl_ptr->irq,  in intel_scu_watchdog_init()