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
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