1 // SPDX-License-Identifier: GPL-2.0-only
3  * PIKA FPGA based Watchdog Timer
29 #define DRV_NAME "PIKA-WDT"
50 	void __iomem *fpga;  member
71 	/* -- FPGA: Reset Control Register (32bit R/W) (Offset: 0x14) --  in pikawdt_reset()
76 	 * Bit 8-11, WTCHDG_TIMEOUT_SEC: Sets the watchdog timeout value in  in pikawdt_reset()
80 	unsigned reset = in_be32(pikawdt_private.fpga + 0x14);  in pikawdt_reset()
81 	/* enable with max timeout - 15 seconds */  in pikawdt_reset()
83 	out_be32(pikawdt_private.fpga + 0x14, reset);  in pikawdt_reset()
118 		return -EBUSY;  in pikawdt_open()
157 				return -EFAULT;  in pikawdt_write()
171  * Handle commands from user-space.
182 		return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;  in pikawdt_ioctl()
196 			return -EFAULT;  in pikawdt_ioctl()
206 	return -ENOTTY;  in pikawdt_ioctl()
228 	void __iomem *fpga;  in pikawdt_init()  local
232 	np = of_find_compatible_node(NULL, NULL, "pika,fpga");  in pikawdt_init()
234 		pr_err("Unable to find fpga\n");  in pikawdt_init()
235 		return -ENOENT;  in pikawdt_init()
238 	pikawdt_private.fpga = of_iomap(np, 0);  in pikawdt_init()
240 	if (pikawdt_private.fpga == NULL) {  in pikawdt_init()
241 		pr_err("Unable to map fpga\n");  in pikawdt_init()
242 		return -ENOMEM;  in pikawdt_init()
245 	ident.firmware_version = in_be32(pikawdt_private.fpga + 0x1c) & 0xffff;  in pikawdt_init()
248 	np = of_find_compatible_node(NULL, NULL, "pika,fpga-sd");  in pikawdt_init()
250 		pr_err("Unable to find fpga-sd\n");  in pikawdt_init()
251 		ret = -ENOENT;  in pikawdt_init()
255 	fpga = of_iomap(np, 0);  in pikawdt_init()
257 	if (fpga == NULL) {  in pikawdt_init()
258 		pr_err("Unable to map fpga-sd\n");  in pikawdt_init()
259 		ret = -ENOMEM;  in pikawdt_init()
263 	/* -- FPGA: POST Test Results Register 1 (32bit R/W) (Offset: 0x4040) --  in pikawdt_init()
267 	post1 = in_be32(fpga + 0x40);  in pikawdt_init()
271 	iounmap(fpga);  in pikawdt_init()
286 	iounmap(pikawdt_private.fpga);  in pikawdt_init()
294 	iounmap(pikawdt_private.fpga);  in pikawdt_exit()
301 MODULE_DESCRIPTION("PIKA FPGA based Watchdog Timer");