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
ppc460ex_device_probe(void)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
ppc460ex_probe(void)40 static int __init ppc460ex_probe(void)
41 {
42 if (of_machine_is_compatible("amcc,canyonlands")) {
43 pci_set_flags(PCI_REASSIGN_ALL_RSRC);
44 return 1;
45 }
46 return 0;
47 }
48
49 /* USB PHY fixup code on Canyonlands kit. */
50
ppc460ex_canyonlands_fixup(void)51 static int __init ppc460ex_canyonlands_fixup(void)
52 {
53 u8 __iomem *bcsr ;
54 void __iomem *vaddr;
55 struct device_node *np;
56 int ret = 0;
57
58 np = of_find_compatible_node(NULL, NULL, "amcc,ppc460ex-bcsr");
59 if (!np) {
60 printk(KERN_ERR "failed did not find amcc, ppc460ex bcsr node\n");
61 return -ENODEV;
62 }
63
64 bcsr = of_iomap(np, 0);
65 of_node_put(np);
66
67 if (!bcsr) {
68 printk(KERN_CRIT "Could not remap bcsr\n");
69 ret = -ENODEV;
70 goto err_bcsr;
71 }
72
73 np = of_find_compatible_node(NULL, NULL, "ibm,ppc4xx-gpio");
74 if (!np) {
75 printk(KERN_ERR "failed did not find ibm,ppc4xx-gpio node\n");
76 return -ENODEV;
77 }
78
79 vaddr = of_iomap(np, 0);
80 of_node_put(np);
81
82 if (!vaddr) {
83 printk(KERN_CRIT "Could not get gpio node address\n");
84 ret = -ENODEV;
85 goto err_gpio;
86 }
87 /* Disable USB, through the BCSR7 bits */
88 setbits8(&bcsr[7], BCSR_USB_EN);
89
90 /* Wait for a while after reset */
91 msleep(100);
92
93 /* Enable USB here */
94 clrbits8(&bcsr[7], BCSR_USB_EN);
95
96 /*
97 * Configure multiplexed gpio16 and gpio19 as alternate1 output
98 * source after USB reset. In this configuration gpio16 will be
99 * USB2HStop and gpio19 will be USB2DStop. For more details refer to
100 * table 34-7 of PPC460EX user manual.
101 */
102 setbits32((vaddr + GPIO0_OSRH), 0x42000000);
103 setbits32((vaddr + GPIO0_TSRH), 0x42000000);
104 err_gpio:
105 iounmap(vaddr);
106 err_bcsr:
107 iounmap(bcsr);
108 return ret;
109 }
110 machine_device_initcall(canyonlands, ppc460ex_canyonlands_fixup);
define_machine(canyonlands)111 define_machine(canyonlands) {
112 .name = "Canyonlands",
113 .probe = ppc460ex_probe,
114 .progress = udbg_progress,
115 .init_IRQ = uic_init_tree,
116 .get_irq = uic_get_irq,
117 .restart = ppc4xx_reset_system,
118 .calibrate_decr = generic_calibrate_decr,
119 };
120