1 // SPDX-License-Identifier: GPL-2.0-or-later
3 // FSI master driver for AST2600
17 #include <linux/gpio/consumer.h>
19 #include "fsi-master.h"
100 	void __iomem *base = aspeed->base;  in __opb_write()
129 		return -EIO;  in __opb_write()
152 	void __iomem *base = aspeed->base;  in __opb_read()
184 		return -EIO;  in __opb_read()
198 			return -EINVAL;  in __opb_read()
238 	if (err == -EIO) {  in check_errors()
262 		return -EINVAL;  in aspeed_master_read()
267 	mutex_lock(&aspeed->lock);  in aspeed_master_read()
280 		ret = -EINVAL;  in aspeed_master_read()
286 	mutex_unlock(&aspeed->lock);  in aspeed_master_read()
297 		return -EINVAL;  in aspeed_master_write()
302 	mutex_lock(&aspeed->lock);  in aspeed_master_write()
315 		ret = -EINVAL;  in aspeed_master_write()
321 	mutex_unlock(&aspeed->lock);  in aspeed_master_write()
337 	mutex_lock(&aspeed->lock);  in aspeed_master_link_enable()
350 	mutex_unlock(&aspeed->lock);  in aspeed_master_link_enable()
415 	dev_info(aspeed->dev, "mmode set to %08x (divisor %d)\n",  in aspeed_master_init()
453 	mutex_lock(&aspeed->lock);  in cfam_reset_store()
454 	gpiod_set_value(aspeed->cfam_reset_gpio, 1);  in cfam_reset_store()
456 	gpiod_set_value(aspeed->cfam_reset_gpio, 0);  in cfam_reset_store()
459 	mutex_unlock(&aspeed->lock);  in cfam_reset_store()
469 	struct device *dev = aspeed->dev;  in setup_cfam_reset()
470 	struct gpio_desc *gpio;  in setup_cfam_reset()  local
473 	gpio = devm_gpiod_get_optional(dev, "cfam-reset", GPIOD_OUT_LOW);  in setup_cfam_reset()
474 	if (IS_ERR(gpio))  in setup_cfam_reset()
475 		return PTR_ERR(gpio);  in setup_cfam_reset()
476 	if (!gpio)  in setup_cfam_reset()
479 	aspeed->cfam_reset_gpio = gpio;  in setup_cfam_reset()
483 		devm_gpiod_put(dev, gpio);  in setup_cfam_reset()
493 	int gpio;  in tacoma_cabled_fsi_fixup()  local
496 	 * The routing GPIO is a jumper indicating we should mux for the  in tacoma_cabled_fsi_fixup()
499 	routing_gpio = devm_gpiod_get_optional(dev, "fsi-routing",  in tacoma_cabled_fsi_fixup()
506 	mux_gpio = devm_gpiod_get_optional(dev, "fsi-mux", GPIOD_ASIS);  in tacoma_cabled_fsi_fixup()
512 	gpio = gpiod_get_value(routing_gpio);  in tacoma_cabled_fsi_fixup()
513 	if (gpio < 0)  in tacoma_cabled_fsi_fixup()
514 		return gpio;  in tacoma_cabled_fsi_fixup()
516 	/* If the routing GPIO is high we should set the mux to low. */  in tacoma_cabled_fsi_fixup()
517 	if (gpio) {  in tacoma_cabled_fsi_fixup()
543 	rc = tacoma_cabled_fsi_fixup(&pdev->dev);  in fsi_master_aspeed_probe()
545 		dev_err(&pdev->dev, "Tacoma FSI cable fixup failed\n");  in fsi_master_aspeed_probe()
551 		return -ENOMEM;  in fsi_master_aspeed_probe()
553 	aspeed->dev = &pdev->dev;  in fsi_master_aspeed_probe()
555 	aspeed->base = devm_platform_ioremap_resource(pdev, 0);  in fsi_master_aspeed_probe()
556 	if (IS_ERR(aspeed->base)) {  in fsi_master_aspeed_probe()
557 		rc = PTR_ERR(aspeed->base);  in fsi_master_aspeed_probe()
561 	aspeed->clk = devm_clk_get(aspeed->dev, NULL);  in fsi_master_aspeed_probe()
562 	if (IS_ERR(aspeed->clk)) {  in fsi_master_aspeed_probe()
563 		dev_err(aspeed->dev, "couldn't get clock\n");  in fsi_master_aspeed_probe()
564 		rc = PTR_ERR(aspeed->clk);  in fsi_master_aspeed_probe()
567 	rc = clk_prepare_enable(aspeed->clk);  in fsi_master_aspeed_probe()
569 		dev_err(aspeed->dev, "couldn't enable clock\n");  in fsi_master_aspeed_probe()
575 		dev_err(&pdev->dev, "CFAM reset GPIO setup failed\n");  in fsi_master_aspeed_probe()
578 	writel(0x1, aspeed->base + OPB_CLK_SYNC);  in fsi_master_aspeed_probe()
580 			aspeed->base + OPB_IRQ_MASK);  in fsi_master_aspeed_probe()
583 	writel(0x10, aspeed->base + OPB_RETRY_COUNTER);  in fsi_master_aspeed_probe()
585 	writel(ctrl_base, aspeed->base + OPB_CTRL_BASE);  in fsi_master_aspeed_probe()
586 	writel(fsi_base, aspeed->base + OPB_FSI_BASE);  in fsi_master_aspeed_probe()
589 	writel(0x00030b1b, aspeed->base + OPB0_READ_ORDER1);  in fsi_master_aspeed_probe()
592 	writel(0x0011101b, aspeed->base + OPB0_WRITE_ORDER1);  in fsi_master_aspeed_probe()
593 	writel(0x0c330f3f, aspeed->base + OPB0_WRITE_ORDER2);  in fsi_master_aspeed_probe()
600 	writel(0x1, aspeed->base + OPB0_SELECT);  in fsi_master_aspeed_probe()
604 		dev_err(&pdev->dev, "failed to read hub version\n");  in fsi_master_aspeed_probe()
610 	dev_info(&pdev->dev, "hub version %08x (%d links)\n", reg, links);  in fsi_master_aspeed_probe()
612 	aspeed->master.dev.parent = &pdev->dev;  in fsi_master_aspeed_probe()
613 	aspeed->master.dev.release = aspeed_master_release;  in fsi_master_aspeed_probe()
614 	aspeed->master.dev.of_node = of_node_get(dev_of_node(&pdev->dev));  in fsi_master_aspeed_probe()
616 	aspeed->master.n_links = links;  in fsi_master_aspeed_probe()
617 	aspeed->master.read = aspeed_master_read;  in fsi_master_aspeed_probe()
618 	aspeed->master.write = aspeed_master_write;  in fsi_master_aspeed_probe()
619 	aspeed->master.send_break = aspeed_master_break;  in fsi_master_aspeed_probe()
620 	aspeed->master.term = aspeed_master_term;  in fsi_master_aspeed_probe()
621 	aspeed->master.link_enable = aspeed_master_link_enable;  in fsi_master_aspeed_probe()
623 	dev_set_drvdata(&pdev->dev, aspeed);  in fsi_master_aspeed_probe()
625 	mutex_init(&aspeed->lock);  in fsi_master_aspeed_probe()
628 	rc = fsi_master_register(&aspeed->master);  in fsi_master_aspeed_probe()
634 	 * will be freed (via ->release) during any subsequent call to  in fsi_master_aspeed_probe()
639 	get_device(&aspeed->master.dev);  in fsi_master_aspeed_probe()
643 	clk_disable_unprepare(aspeed->clk);  in fsi_master_aspeed_probe()
653 	fsi_master_unregister(&aspeed->master);  in fsi_master_aspeed_remove()
654 	clk_disable_unprepare(aspeed->clk);  in fsi_master_aspeed_remove()
658 	{ .compatible = "aspeed,ast2600-fsi-master" },
665 		.name		= "fsi-master-aspeed",
673 MODULE_DESCRIPTION("FSI master driver for AST2600");