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
36 static 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
ppc460ex_device_probe(void)44 static int __init ppc460ex_device_probe(void)
45 {
46 of_platform_bus_probe(NULL, ppc460ex_of_bus, NULL);
47
48 return 0;
49 }
50 machine_device_initcall(canyonlands, ppc460ex_device_probe);
51
52 /* Using this code only for the Canyonlands board. */
53
ppc460ex_probe(void)54 static 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
ppc460ex_canyonlands_fixup(void)66 static 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);
119 err_gpio:
120 iounmap(vaddr);
121 err_bcsr:
122 iounmap(bcsr);
123 return ret;
124 }
125 machine_device_initcall(canyonlands, ppc460ex_canyonlands_fixup);
define_machine(canyonlands)126 define_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