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 
22 static 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 
30 static int __init ppc460ex_device_probe(void)
31 {
32 	of_platform_bus_probe(NULL, ppc460ex_of_bus, NULL);
33 
34 	return 0;
35 }
36 machine_device_initcall(canyonlands, ppc460ex_device_probe);
37 
38 /* Using this code only for the Canyonlands board.  */
39 
40 static 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 
49 static 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);
102 err_gpio:
103 	iounmap(vaddr);
104 err_bcsr:
105 	iounmap(bcsr);
106 	return ret;
107 }
108 machine_device_initcall(canyonlands, ppc460ex_canyonlands_fixup);
109 define_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