26  *     (c) Copyright 2007-2008 Xilinx Inc.
36  * This is the code behind /dev/icap* -- it allows a user-space
64  * user-space application code that uses this device.  The simplest
69  * Note that unless foo.bit is an appropriately constructed partial
71  * currently programmed in the FPGA.
218  * hwicap_command_desync - Send a DESYNC command to the ICAP port.
235 	buffer[index++] = hwicap_type_1_write(drvdata->config_regs->CMD) | 1;  in hwicap_command_desync()
244 	return drvdata->config->set_configuration(drvdata,  in hwicap_command_desync()
249  * hwicap_get_configuration_register - Query a configuration register.
281 	status = drvdata->config->set_configuration(drvdata,  in hwicap_get_configuration_register()
287 	status = drvdata->config->get_status(drvdata);  in hwicap_get_configuration_register()
289 		return -EIO;  in hwicap_get_configuration_register()
300 	status = drvdata->config->set_configuration(drvdata,  in hwicap_get_configuration_register()
308 	status = drvdata->config->get_configuration(drvdata, reg_data, 1);  in hwicap_get_configuration_register()
320 	dev_dbg(drvdata->dev, "initializing\n");  in hwicap_initialize_hwicap()
325 	dev_dbg(drvdata->dev, "Reset...\n");  in hwicap_initialize_hwicap()
326 	drvdata->config->reset(drvdata);  in hwicap_initialize_hwicap()
328 	dev_dbg(drvdata->dev, "Desync...\n");  in hwicap_initialize_hwicap()
337 	dev_dbg(drvdata->dev, "Reading IDCODE...\n");  in hwicap_initialize_hwicap()
339 			drvdata, drvdata->config_regs->IDCODE, &idcode);  in hwicap_initialize_hwicap()
340 	dev_dbg(drvdata->dev, "IDCODE = %x\n", idcode);  in hwicap_initialize_hwicap()
344 	dev_dbg(drvdata->dev, "Desync...\n");  in hwicap_initialize_hwicap()
355 	struct hwicap_drvdata *drvdata = file->private_data;  in hwicap_read()
362 	status = mutex_lock_interruptible(&drvdata->sem);  in hwicap_read()
366 	if (drvdata->read_buffer_in_use) {  in hwicap_read()
371 			(count < drvdata->read_buffer_in_use) ? count :  in hwicap_read()
372 			drvdata->read_buffer_in_use;  in hwicap_read()
375 		if (copy_to_user(buf, drvdata->read_buffer, bytes_to_read)) {  in hwicap_read()
376 			status = -EFAULT;  in hwicap_read()
379 		drvdata->read_buffer_in_use -= bytes_to_read;  in hwicap_read()
380 		memmove(drvdata->read_buffer,  in hwicap_read()
381 		       drvdata->read_buffer + bytes_to_read,  in hwicap_read()
382 		       4 - bytes_to_read);  in hwicap_read()
387 			status = -ENOMEM;  in hwicap_read()
410 		status = drvdata->config->get_configuration(drvdata,  in hwicap_read()
422 			status = -EFAULT;  in hwicap_read()
425 		memcpy(drvdata->read_buffer,  in hwicap_read()
428 		drvdata->read_buffer_in_use = bytes_remaining;  in hwicap_read()
433 	mutex_unlock(&drvdata->sem);  in hwicap_read()
441 	struct hwicap_drvdata *drvdata = file->private_data;  in hwicap_write()
448 	status = mutex_lock_interruptible(&drvdata->sem);  in hwicap_write()
452 	left += drvdata->write_buffer_in_use;  in hwicap_write()
462 		status = -ENOMEM;  in hwicap_write()
475 		if (drvdata->write_buffer_in_use) {  in hwicap_write()
476 			memcpy(kbuf, drvdata->write_buffer,  in hwicap_write()
477 					drvdata->write_buffer_in_use);  in hwicap_write()
479 			    (((char *)kbuf) + drvdata->write_buffer_in_use),  in hwicap_write()
481 			    len - (drvdata->write_buffer_in_use))) {  in hwicap_write()
483 				status = -EFAULT;  in hwicap_write()
489 				status = -EFAULT;  in hwicap_write()
494 		status = drvdata->config->set_configuration(drvdata,  in hwicap_write()
499 			status = -EFAULT;  in hwicap_write()
502 		if (drvdata->write_buffer_in_use) {  in hwicap_write()
503 			len -= drvdata->write_buffer_in_use;  in hwicap_write()
504 			left -= drvdata->write_buffer_in_use;  in hwicap_write()
505 			drvdata->write_buffer_in_use = 0;  in hwicap_write()
508 		left -= len;  in hwicap_write()
511 		if (!copy_from_user(drvdata->write_buffer,  in hwicap_write()
513 			drvdata->write_buffer_in_use = left;  in hwicap_write()
522 	mutex_unlock(&drvdata->sem);  in hwicap_write()
532 	drvdata = container_of(inode->i_cdev, struct hwicap_drvdata, cdev);  in hwicap_open()
534 	status = mutex_lock_interruptible(&drvdata->sem);  in hwicap_open()
538 	if (drvdata->is_open) {  in hwicap_open()
539 		status = -EBUSY;  in hwicap_open()
545 		dev_err(drvdata->dev, "Failed to open file");  in hwicap_open()
549 	file->private_data = drvdata;  in hwicap_open()
550 	drvdata->write_buffer_in_use = 0;  in hwicap_open()
551 	drvdata->read_buffer_in_use = 0;  in hwicap_open()
552 	drvdata->is_open = 1;  in hwicap_open()
555 	mutex_unlock(&drvdata->sem);  in hwicap_open()
563 	struct hwicap_drvdata *drvdata = file->private_data;  in hwicap_release()
567 	mutex_lock(&drvdata->sem);  in hwicap_release()
569 	if (drvdata->write_buffer_in_use) {  in hwicap_release()
571 		for (i = drvdata->write_buffer_in_use; i < 4; i++)  in hwicap_release()
572 			drvdata->write_buffer[i] = 0;  in hwicap_release()
574 		status = drvdata->config->set_configuration(drvdata,  in hwicap_release()
575 				(u32 *) drvdata->write_buffer, 1);  in hwicap_release()
585 	drvdata->is_open = 0;  in hwicap_release()
586 	mutex_unlock(&drvdata->sem);  in hwicap_release()
600 		const struct hwicap_driver_config *config,  in hwicap_setup()  argument
605 	struct device *dev = &pdev->dev;  in hwicap_setup()
620 		return -EINVAL;  in hwicap_setup()
626 		return -EBUSY;  in hwicap_setup()
636 		retval = -ENOMEM;  in hwicap_setup()
641 	drvdata->base_address = devm_platform_ioremap_resource(pdev, 0);  in hwicap_setup()
642 	if (IS_ERR(drvdata->base_address)) {  in hwicap_setup()
643 		retval = PTR_ERR(drvdata->base_address);  in hwicap_setup()
647 	drvdata->devt = devt;  in hwicap_setup()
648 	drvdata->dev = dev;  in hwicap_setup()
649 	drvdata->config = config;  in hwicap_setup()
650 	drvdata->config_regs = config_regs;  in hwicap_setup()
652 	mutex_init(&drvdata->sem);  in hwicap_setup()
653 	drvdata->is_open = 0;  in hwicap_setup()
655 	cdev_init(&drvdata->cdev, &hwicap_fops);  in hwicap_setup()
656 	drvdata->cdev.owner = THIS_MODULE;  in hwicap_setup()
657 	retval = cdev_add(&drvdata->cdev, devt, 1);  in hwicap_setup()
691 	const struct hwicap_driver_config *config;  in hwicap_drv_probe()  local
693 	int id = -1;  in hwicap_drv_probe()
695 	config = device_get_match_data(&pdev->dev);  in hwicap_drv_probe()
697 	of_property_read_u32(pdev->dev.of_node, "port-number", &id);  in hwicap_drv_probe()
703 	if (!of_property_read_string(pdev->dev.of_node, "xlnx,family", &family)) {  in hwicap_drv_probe()
713 	return hwicap_setup(pdev, id, config, regs);  in hwicap_drv_probe()
718 	struct device *dev = &pdev->dev;  in hwicap_drv_remove()
723 	device_destroy(&icap_class, drvdata->devt);  in hwicap_drv_remove()
724 	cdev_del(&drvdata->cdev);  in hwicap_drv_remove()
727 	probed_devices[MINOR(dev->devt)-XHWICAP_MINOR] = 0;  in hwicap_drv_remove()
733 	{ .compatible = "xlnx,opb-hwicap-1.00.b", .data = &buffer_icap_config},
734 	{ .compatible = "xlnx,xps-hwicap-1.00.a", .data = &fifo_icap_config},