1/*
2 * This contain platform specific code for APM PPC460EX based Canyonlands
3 * board.
4 *
5 * Copyright (c) 2010, Applied Micro Circuits Corporation
6 * Author: Rupjyoti Sarmah <rsarmah@apm.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 *
23 */
24#include <linux/kernel.h>
25#include <linux/init.h>
26#include <asm/pci-bridge.h>
27#include <asm/ppc4xx.h>
28#include <asm/udbg.h>
29#include <asm/uic.h>
30#include <linux/of_platform.h>
31#include <linux/delay.h>
32#include "44x.h"
33
34#define BCSR_USB_EN	0x11
35
36static const struct of_device_id ppc460ex_of_bus[] __initconst = {
37	{ .compatible = "ibm,plb4", },
38	{ .compatible = "ibm,opb", },
39	{ .compatible = "ibm,ebc", },
40	{ .compatible = "simple-bus", },
41	{},
42};
43
44static int __init ppc460ex_device_probe(void)
45{
46	of_platform_bus_probe(NULL, ppc460ex_of_bus, NULL);
47
48	return 0;
49}
50machine_device_initcall(canyonlands, ppc460ex_device_probe);
51
52/* Using this code only for the Canyonlands board.  */
53
54static int __init ppc460ex_probe(void)
55{
56	unsigned long root = of_get_flat_dt_root();
57	if (of_flat_dt_is_compatible(root, "amcc,canyonlands")) {
58		pci_set_flags(PCI_REASSIGN_ALL_RSRC);
59		return 1;
60		}
61	return 0;
62}
63
64/* USB PHY fixup code on Canyonlands kit. */
65
66static int __init ppc460ex_canyonlands_fixup(void)
67{
68	u8 __iomem *bcsr ;
69	void __iomem *vaddr;
70	struct device_node *np;
71	int ret = 0;
72
73	np = of_find_compatible_node(NULL, NULL, "amcc,ppc460ex-bcsr");
74	if (!np) {
75		printk(KERN_ERR "failed did not find amcc, ppc460ex bcsr node\n");
76		return -ENODEV;
77	}
78
79	bcsr = of_iomap(np, 0);
80	of_node_put(np);
81
82	if (!bcsr) {
83		printk(KERN_CRIT "Could not remap bcsr\n");
84		ret = -ENODEV;
85		goto err_bcsr;
86	}
87
88	np = of_find_compatible_node(NULL, NULL, "ibm,ppc4xx-gpio");
89	if (!np) {
90		printk(KERN_ERR "failed did not find ibm,ppc4xx-gpio node\n");
91		return -ENODEV;
92	}
93
94	vaddr = of_iomap(np, 0);
95	of_node_put(np);
96
97	if (!vaddr) {
98		printk(KERN_CRIT "Could not get gpio node address\n");
99		ret = -ENODEV;
100		goto err_gpio;
101	}
102	/* Disable USB, through the BCSR7 bits */
103	setbits8(&bcsr[7], BCSR_USB_EN);
104
105	/* Wait for a while after reset */
106	msleep(100);
107
108	/* Enable USB here */
109	clrbits8(&bcsr[7], BCSR_USB_EN);
110
111	/*
112	 * Configure multiplexed gpio16 and gpio19 as alternate1 output
113	 * source after USB reset. In this configuration gpio16 will be
114	 * USB2HStop and gpio19 will be USB2DStop. For more details refer to
115	 * table 34-7 of PPC460EX user manual.
116	 */
117	setbits32((vaddr + GPIO0_OSRH), 0x42000000);
118	setbits32((vaddr + GPIO0_TSRH), 0x42000000);
119err_gpio:
120	iounmap(vaddr);
121err_bcsr:
122	iounmap(bcsr);
123	return ret;
124}
125machine_device_initcall(canyonlands, ppc460ex_canyonlands_fixup);
126define_machine(canyonlands) {
127	.name = "Canyonlands",
128	.probe = ppc460ex_probe,
129	.progress = udbg_progress,
130	.init_IRQ = uic_init_tree,
131	.get_irq = uic_get_irq,
132	.restart = ppc4xx_reset_system,
133	.calibrate_decr = generic_calibrate_decr,
134};
135