1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * This contain platform specific code for APM PPC460EX based Canyonlands
4 * board.
5 *
6 * Copyright (c) 2010, Applied Micro Circuits Corporation
7 * Author: Rupjyoti Sarmah <rsarmah@apm.com>
8 */
9#include <linux/kernel.h>
10#include <linux/init.h>
11#include <asm/pci-bridge.h>
12#include <asm/ppc4xx.h>
13#include <asm/udbg.h>
14#include <asm/uic.h>
15#include <linux/of_address.h>
16#include <linux/of_platform.h>
17#include <linux/delay.h>
18#include "44x.h"
19
20#define BCSR_USB_EN	0x11
21
22static const struct of_device_id ppc460ex_of_bus[] __initconst = {
23	{ .compatible = "ibm,plb4", },
24	{ .compatible = "ibm,opb", },
25	{ .compatible = "ibm,ebc", },
26	{ .compatible = "simple-bus", },
27	{},
28};
29
30static int __init ppc460ex_device_probe(void)
31{
32	of_platform_bus_probe(NULL, ppc460ex_of_bus, NULL);
33
34	return 0;
35}
36machine_device_initcall(canyonlands, ppc460ex_device_probe);
37
38/* Using this code only for the Canyonlands board.  */
39
40static int __init ppc460ex_probe(void)
41{
42	pci_set_flags(PCI_REASSIGN_ALL_RSRC);
43
44	return 1;
45}
46
47/* USB PHY fixup code on Canyonlands kit. */
48
49static int __init ppc460ex_canyonlands_fixup(void)
50{
51	u8 __iomem *bcsr ;
52	void __iomem *vaddr;
53	struct device_node *np;
54	int ret = 0;
55
56	np = of_find_compatible_node(NULL, NULL, "amcc,ppc460ex-bcsr");
57	if (!np) {
58		printk(KERN_ERR "failed did not find amcc, ppc460ex bcsr node\n");
59		return -ENODEV;
60	}
61
62	bcsr = of_iomap(np, 0);
63	of_node_put(np);
64
65	if (!bcsr) {
66		printk(KERN_CRIT "Could not remap bcsr\n");
67		ret = -ENODEV;
68		goto err_bcsr;
69	}
70
71	np = of_find_compatible_node(NULL, NULL, "ibm,ppc4xx-gpio");
72	if (!np) {
73		printk(KERN_ERR "failed did not find ibm,ppc4xx-gpio node\n");
74		return -ENODEV;
75	}
76
77	vaddr = of_iomap(np, 0);
78	of_node_put(np);
79
80	if (!vaddr) {
81		printk(KERN_CRIT "Could not get gpio node address\n");
82		ret = -ENODEV;
83		goto err_gpio;
84	}
85	/* Disable USB, through the BCSR7 bits */
86	setbits8(&bcsr[7], BCSR_USB_EN);
87
88	/* Wait for a while after reset */
89	msleep(100);
90
91	/* Enable USB here */
92	clrbits8(&bcsr[7], BCSR_USB_EN);
93
94	/*
95	 * Configure multiplexed gpio16 and gpio19 as alternate1 output
96	 * source after USB reset. In this configuration gpio16 will be
97	 * USB2HStop and gpio19 will be USB2DStop. For more details refer to
98	 * table 34-7 of PPC460EX user manual.
99	 */
100	setbits32((vaddr + GPIO0_OSRH), 0x42000000);
101	setbits32((vaddr + GPIO0_TSRH), 0x42000000);
102err_gpio:
103	iounmap(vaddr);
104err_bcsr:
105	iounmap(bcsr);
106	return ret;
107}
108machine_device_initcall(canyonlands, ppc460ex_canyonlands_fixup);
109define_machine(canyonlands) {
110	.name = "Canyonlands",
111	.compatible = "amcc,canyonlands",
112	.probe = ppc460ex_probe,
113	.progress = udbg_progress,
114	.init_IRQ = uic_init_tree,
115	.get_irq = uic_get_irq,
116	.restart = ppc4xx_reset_system,
117};
118