canyonlands.c

  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
 22static 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
 30static int __init ppc460ex_device_probe(void)
 31{
 32	of_platform_bus_probe(NULL, ppc460ex_of_bus, NULL);
 33
 34	return 0;
 35}
 36machine_device_initcall(canyonlands, ppc460ex_device_probe);
 37
 38/* Using this code only for the Canyonlands board.  */
 39
 40static 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
 49static 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);
102err_gpio:
103	iounmap(vaddr);
104err_bcsr:
105	iounmap(bcsr);
106	return ret;
107}
108machine_device_initcall(canyonlands, ppc460ex_canyonlands_fixup);
109define_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};