2  * PIKA FPGA based Watchdog Timer
28 #define DRV_NAME "PIKA-WDT"
49 	void __iomem *fpga;  member
70 	/* -- FPGA: Reset Control Register (32bit R/W) (Offset: 0x14) --  in pikawdt_reset()
75 	 * Bit 8-11, WTCHDG_TIMEOUT_SEC: Sets the watchdog timeout value in  in pikawdt_reset()
79 	unsigned reset = in_be32(pikawdt_private.fpga + 0x14);  in pikawdt_reset()
80 	/* enable with max timeout - 15 seconds */  in pikawdt_reset()
82 	out_be32(pikawdt_private.fpga + 0x14, reset);  in pikawdt_reset()
117 		return -EBUSY;  in pikawdt_open()
156 				return -EFAULT;  in pikawdt_write()
170  * Handle commands from user-space.
181 		return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;  in pikawdt_ioctl()
195 			return -EFAULT;  in pikawdt_ioctl()
205 	return -ENOTTY;  in pikawdt_ioctl()
227 	void __iomem *fpga;  in pikawdt_init()  local
231 	np = of_find_compatible_node(NULL, NULL, "pika,fpga");  in pikawdt_init()
233 		pr_err("Unable to find fpga\n");  in pikawdt_init()
234 		return -ENOENT;  in pikawdt_init()
237 	pikawdt_private.fpga = of_iomap(np, 0);  in pikawdt_init()
239 	if (pikawdt_private.fpga == NULL) {  in pikawdt_init()
240 		pr_err("Unable to map fpga\n");  in pikawdt_init()
241 		return -ENOMEM;  in pikawdt_init()
244 	ident.firmware_version = in_be32(pikawdt_private.fpga + 0x1c) & 0xffff;  in pikawdt_init()
247 	np = of_find_compatible_node(NULL, NULL, "pika,fpga-sd");  in pikawdt_init()
249 		pr_err("Unable to find fpga-sd\n");  in pikawdt_init()
250 		ret = -ENOENT;  in pikawdt_init()
254 	fpga = of_iomap(np, 0);  in pikawdt_init()
256 	if (fpga == NULL) {  in pikawdt_init()
257 		pr_err("Unable to map fpga-sd\n");  in pikawdt_init()
258 		ret = -ENOMEM;  in pikawdt_init()
262 	/* -- FPGA: POST Test Results Register 1 (32bit R/W) (Offset: 0x4040) --  in pikawdt_init()
266 	post1 = in_be32(fpga + 0x40);  in pikawdt_init()
270 	iounmap(fpga);  in pikawdt_init()
285 	iounmap(pikawdt_private.fpga);  in pikawdt_init()
293 	iounmap(pikawdt_private.fpga);  in pikawdt_exit()
300 MODULE_DESCRIPTION("PIKA FPGA based Watchdog Timer");