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_platform.h>
16#include <linux/delay.h>
17#include "44x.h"
18
19#define BCSR_USB_EN	0x11
20
21static const struct of_device_id ppc460ex_of_bus[] __initconst = {
22	{ .compatible = "ibm,plb4", },
23	{ .compatible = "ibm,opb", },
24	{ .compatible = "ibm,ebc", },
25	{ .compatible = "simple-bus", },
26	{},
27};
28
29static int __init ppc460ex_device_probe(void)
30{
31	of_platform_bus_probe(NULL, ppc460ex_of_bus, NULL);
32
33	return 0;
34}
35machine_device_initcall(canyonlands, ppc460ex_device_probe);
36
37/* Using this code only for the Canyonlands board.  */
38
39static int __init ppc460ex_probe(void)
40{
41	if (of_machine_is_compatible("amcc,canyonlands")) {
42		pci_set_flags(PCI_REASSIGN_ALL_RSRC);
43		return 1;
44	}
45	return 0;
46}
47
48/* USB PHY fixup code on Canyonlands kit. */
49
50static int __init ppc460ex_canyonlands_fixup(void)
51{
52	u8 __iomem *bcsr ;
53	void __iomem *vaddr;
54	struct device_node *np;
55	int ret = 0;
56
57	np = of_find_compatible_node(NULL, NULL, "amcc,ppc460ex-bcsr");
58	if (!np) {
59		printk(KERN_ERR "failed did not find amcc, ppc460ex bcsr node\n");
60		return -ENODEV;
61	}
62
63	bcsr = of_iomap(np, 0);
64	of_node_put(np);
65
66	if (!bcsr) {
67		printk(KERN_CRIT "Could not remap bcsr\n");
68		ret = -ENODEV;
69		goto err_bcsr;
70	}
71
72	np = of_find_compatible_node(NULL, NULL, "ibm,ppc4xx-gpio");
73	if (!np) {
74		printk(KERN_ERR "failed did not find ibm,ppc4xx-gpio node\n");
75		return -ENODEV;
76	}
77
78	vaddr = of_iomap(np, 0);
79	of_node_put(np);
80
81	if (!vaddr) {
82		printk(KERN_CRIT "Could not get gpio node address\n");
83		ret = -ENODEV;
84		goto err_gpio;
85	}
86	/* Disable USB, through the BCSR7 bits */
87	setbits8(&bcsr[7], BCSR_USB_EN);
88
89	/* Wait for a while after reset */
90	msleep(100);
91
92	/* Enable USB here */
93	clrbits8(&bcsr[7], BCSR_USB_EN);
94
95	/*
96	 * Configure multiplexed gpio16 and gpio19 as alternate1 output
97	 * source after USB reset. In this configuration gpio16 will be
98	 * USB2HStop and gpio19 will be USB2DStop. For more details refer to
99	 * table 34-7 of PPC460EX user manual.
100	 */
101	setbits32((vaddr + GPIO0_OSRH), 0x42000000);
102	setbits32((vaddr + GPIO0_TSRH), 0x42000000);
103err_gpio:
104	iounmap(vaddr);
105err_bcsr:
106	iounmap(bcsr);
107	return ret;
108}
109machine_device_initcall(canyonlands, ppc460ex_canyonlands_fixup);
110define_machine(canyonlands) {
111	.name = "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	.calibrate_decr = generic_calibrate_decr,
118};
119