1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Freescale 83xx USB SOC setup code
4  *
5  * Copyright (C) 2007 Freescale Semiconductor, Inc.
6  * Author: Li Yang
7  */
8 
9 #include <linux/stddef.h>
10 #include <linux/kernel.h>
11 #include <linux/errno.h>
12 #include <linux/of.h>
13 #include <linux/of_address.h>
14 #include <linux/io.h>
15 
16 #include <sysdev/fsl_soc.h>
17 
18 #include "mpc83xx.h"
19 
20 int __init mpc837x_usb_cfg(void)
21 {
22 	void __iomem *immap;
23 	struct device_node *np = NULL;
24 	const void *prop;
25 	int ret = 0;
26 
27 	np = of_find_compatible_node(NULL, NULL, "fsl-usb2-dr");
28 	if (!np || !of_device_is_available(np)) {
29 		of_node_put(np);
30 		return -ENODEV;
31 	}
32 	prop = of_get_property(np, "phy_type", NULL);
33 
34 	if (!prop || (strcmp(prop, "ulpi") && strcmp(prop, "serial"))) {
35 		pr_warn("837x USB PHY type not supported\n");
36 		of_node_put(np);
37 		return -EINVAL;
38 	}
39 
40 	/* Map IMMR space for pin and clock settings */
41 	immap = ioremap(get_immrbase(), 0x1000);
42 	if (!immap) {
43 		of_node_put(np);
44 		return -ENOMEM;
45 	}
46 
47 	/* Configure clock */
48 	clrsetbits_be32(immap + MPC83XX_SCCR_OFFS, MPC837X_SCCR_USB_DRCM_11,
49 			MPC837X_SCCR_USB_DRCM_11);
50 
51 	/* Configure pin mux for ULPI/serial */
52 	clrsetbits_be32(immap + MPC83XX_SICRL_OFFS, MPC837X_SICRL_USB_MASK,
53 			MPC837X_SICRL_USB_ULPI);
54 
55 	iounmap(immap);
56 	of_node_put(np);
57 	return ret;
58 }
59