1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * This contain platform specific code for APM PPC460EX based Canyonlands
4*4882a593Smuzhiyun * board.
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * Copyright (c) 2010, Applied Micro Circuits Corporation
7*4882a593Smuzhiyun * Author: Rupjyoti Sarmah <rsarmah@apm.com>
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun #include <linux/kernel.h>
10*4882a593Smuzhiyun #include <linux/init.h>
11*4882a593Smuzhiyun #include <asm/pci-bridge.h>
12*4882a593Smuzhiyun #include <asm/ppc4xx.h>
13*4882a593Smuzhiyun #include <asm/udbg.h>
14*4882a593Smuzhiyun #include <asm/uic.h>
15*4882a593Smuzhiyun #include <linux/of_platform.h>
16*4882a593Smuzhiyun #include <linux/delay.h>
17*4882a593Smuzhiyun #include "44x.h"
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #define BCSR_USB_EN 0x11
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun static const struct of_device_id ppc460ex_of_bus[] __initconst = {
22*4882a593Smuzhiyun { .compatible = "ibm,plb4", },
23*4882a593Smuzhiyun { .compatible = "ibm,opb", },
24*4882a593Smuzhiyun { .compatible = "ibm,ebc", },
25*4882a593Smuzhiyun { .compatible = "simple-bus", },
26*4882a593Smuzhiyun {},
27*4882a593Smuzhiyun };
28*4882a593Smuzhiyun
ppc460ex_device_probe(void)29*4882a593Smuzhiyun static int __init ppc460ex_device_probe(void)
30*4882a593Smuzhiyun {
31*4882a593Smuzhiyun of_platform_bus_probe(NULL, ppc460ex_of_bus, NULL);
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun return 0;
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun machine_device_initcall(canyonlands, ppc460ex_device_probe);
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun /* Using this code only for the Canyonlands board. */
38*4882a593Smuzhiyun
ppc460ex_probe(void)39*4882a593Smuzhiyun static int __init ppc460ex_probe(void)
40*4882a593Smuzhiyun {
41*4882a593Smuzhiyun if (of_machine_is_compatible("amcc,canyonlands")) {
42*4882a593Smuzhiyun pci_set_flags(PCI_REASSIGN_ALL_RSRC);
43*4882a593Smuzhiyun return 1;
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun return 0;
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun /* USB PHY fixup code on Canyonlands kit. */
49*4882a593Smuzhiyun
ppc460ex_canyonlands_fixup(void)50*4882a593Smuzhiyun static int __init ppc460ex_canyonlands_fixup(void)
51*4882a593Smuzhiyun {
52*4882a593Smuzhiyun u8 __iomem *bcsr ;
53*4882a593Smuzhiyun void __iomem *vaddr;
54*4882a593Smuzhiyun struct device_node *np;
55*4882a593Smuzhiyun int ret = 0;
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun np = of_find_compatible_node(NULL, NULL, "amcc,ppc460ex-bcsr");
58*4882a593Smuzhiyun if (!np) {
59*4882a593Smuzhiyun printk(KERN_ERR "failed did not find amcc, ppc460ex bcsr node\n");
60*4882a593Smuzhiyun return -ENODEV;
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun bcsr = of_iomap(np, 0);
64*4882a593Smuzhiyun of_node_put(np);
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun if (!bcsr) {
67*4882a593Smuzhiyun printk(KERN_CRIT "Could not remap bcsr\n");
68*4882a593Smuzhiyun ret = -ENODEV;
69*4882a593Smuzhiyun goto err_bcsr;
70*4882a593Smuzhiyun }
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun np = of_find_compatible_node(NULL, NULL, "ibm,ppc4xx-gpio");
73*4882a593Smuzhiyun if (!np) {
74*4882a593Smuzhiyun printk(KERN_ERR "failed did not find ibm,ppc4xx-gpio node\n");
75*4882a593Smuzhiyun return -ENODEV;
76*4882a593Smuzhiyun }
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun vaddr = of_iomap(np, 0);
79*4882a593Smuzhiyun of_node_put(np);
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun if (!vaddr) {
82*4882a593Smuzhiyun printk(KERN_CRIT "Could not get gpio node address\n");
83*4882a593Smuzhiyun ret = -ENODEV;
84*4882a593Smuzhiyun goto err_gpio;
85*4882a593Smuzhiyun }
86*4882a593Smuzhiyun /* Disable USB, through the BCSR7 bits */
87*4882a593Smuzhiyun setbits8(&bcsr[7], BCSR_USB_EN);
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun /* Wait for a while after reset */
90*4882a593Smuzhiyun msleep(100);
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun /* Enable USB here */
93*4882a593Smuzhiyun clrbits8(&bcsr[7], BCSR_USB_EN);
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun /*
96*4882a593Smuzhiyun * Configure multiplexed gpio16 and gpio19 as alternate1 output
97*4882a593Smuzhiyun * source after USB reset. In this configuration gpio16 will be
98*4882a593Smuzhiyun * USB2HStop and gpio19 will be USB2DStop. For more details refer to
99*4882a593Smuzhiyun * table 34-7 of PPC460EX user manual.
100*4882a593Smuzhiyun */
101*4882a593Smuzhiyun setbits32((vaddr + GPIO0_OSRH), 0x42000000);
102*4882a593Smuzhiyun setbits32((vaddr + GPIO0_TSRH), 0x42000000);
103*4882a593Smuzhiyun err_gpio:
104*4882a593Smuzhiyun iounmap(vaddr);
105*4882a593Smuzhiyun err_bcsr:
106*4882a593Smuzhiyun iounmap(bcsr);
107*4882a593Smuzhiyun return ret;
108*4882a593Smuzhiyun }
109*4882a593Smuzhiyun machine_device_initcall(canyonlands, ppc460ex_canyonlands_fixup);
define_machine(canyonlands)110*4882a593Smuzhiyun define_machine(canyonlands) {
111*4882a593Smuzhiyun .name = "Canyonlands",
112*4882a593Smuzhiyun .probe = ppc460ex_probe,
113*4882a593Smuzhiyun .progress = udbg_progress,
114*4882a593Smuzhiyun .init_IRQ = uic_init_tree,
115*4882a593Smuzhiyun .get_irq = uic_get_irq,
116*4882a593Smuzhiyun .restart = ppc4xx_reset_system,
117*4882a593Smuzhiyun .calibrate_decr = generic_calibrate_decr,
118*4882a593Smuzhiyun };
119