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
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