1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * This contain platform specific code for APM PPC460EX based Canyonlands
6 * Copyright (c) 2010, Applied Micro Circuits Corporation
7 * Author: Rupjyoti Sarmah <rsarmah@apm.com>
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <asm/pci-bridge.h>
12 #include <asm/ppc4xx.h>
15 #include <linux/of_address.h>
16 #include <linux/of_platform.h>
17 #include <linux/delay.h>
20 #define BCSR_USB_EN 0x11
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", },
30 static int __init ppc460ex_device_probe(void)
32 of_platform_bus_probe(NULL, ppc460ex_of_bus, NULL);
36 machine_device_initcall(canyonlands, ppc460ex_device_probe);
38 /* Using this code only for the Canyonlands board. */
40 static int __init ppc460ex_probe(void)
42 if (of_machine_is_compatible("amcc,canyonlands")) {
43 pci_set_flags(PCI_REASSIGN_ALL_RSRC);
49 /* USB PHY fixup code on Canyonlands kit. */
51 static int __init ppc460ex_canyonlands_fixup(void)
55 struct device_node *np;
58 np = of_find_compatible_node(NULL, NULL, "amcc,ppc460ex-bcsr");
60 printk(KERN_ERR "failed did not find amcc, ppc460ex bcsr node\n");
64 bcsr = of_iomap(np, 0);
68 printk(KERN_CRIT "Could not remap bcsr\n");
73 np = of_find_compatible_node(NULL, NULL, "ibm,ppc4xx-gpio");
75 printk(KERN_ERR "failed did not find ibm,ppc4xx-gpio node\n");
79 vaddr = of_iomap(np, 0);
83 printk(KERN_CRIT "Could not get gpio node address\n");
87 /* Disable USB, through the BCSR7 bits */
88 setbits8(&bcsr[7], BCSR_USB_EN);
90 /* Wait for a while after reset */
94 clrbits8(&bcsr[7], BCSR_USB_EN);
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.
102 setbits32((vaddr + GPIO0_OSRH), 0x42000000);
103 setbits32((vaddr + GPIO0_TSRH), 0x42000000);
110 machine_device_initcall(canyonlands, ppc460ex_canyonlands_fixup);
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,