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