/arch/powerpc/platforms/44x/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_platform.h>
 16#include <linux/delay.h>
 17#include "44x.h"
 18
 19#define BCSR_USB_EN	0x11
 20
 21static const struct of_device_id ppc460ex_of_bus[] __initconst = {
 22	{ .compatible = "ibm,plb4", },
 23	{ .compatible = "ibm,opb", },
 24	{ .compatible = "ibm,ebc", },
 25	{ .compatible = "simple-bus", },
 26	{},
 27};
 28
 29static int __init ppc460ex_device_probe(void)
 30{
 31	of_platform_bus_probe(NULL, ppc460ex_of_bus, NULL);
 32
 33	return 0;
 34}
 35machine_device_initcall(canyonlands, ppc460ex_device_probe);
 36
 37/* Using this code only for the Canyonlands board.  */
 38
 39static int __init ppc460ex_probe(void)
 40{
 41	if (of_machine_is_compatible("amcc,canyonlands")) {
 42		pci_set_flags(PCI_REASSIGN_ALL_RSRC);
 43		return 1;
 44	}
 45	return 0;
 46}
 47
 48/* USB PHY fixup code on Canyonlands kit. */
 49
 50static int __init ppc460ex_canyonlands_fixup(void)
 51{
 52	u8 __iomem *bcsr ;
 53	void __iomem *vaddr;
 54	struct device_node *np;
 55	int ret = 0;
 56
 57	np = of_find_compatible_node(NULL, NULL, "amcc,ppc460ex-bcsr");
 58	if (!np) {
 59		printk(KERN_ERR "failed did not find amcc, ppc460ex bcsr node\n");
 60		return -ENODEV;
 61	}
 62
 63	bcsr = of_iomap(np, 0);
 64	of_node_put(np);
 65
 66	if (!bcsr) {
 67		printk(KERN_CRIT "Could not remap bcsr\n");
 68		ret = -ENODEV;
 69		goto err_bcsr;
 70	}
 71
 72	np = of_find_compatible_node(NULL, NULL, "ibm,ppc4xx-gpio");
 73	if (!np) {
 74		printk(KERN_ERR "failed did not find ibm,ppc4xx-gpio node\n");
 75		return -ENODEV;
 76	}
 77
 78	vaddr = of_iomap(np, 0);
 79	of_node_put(np);
 80
 81	if (!vaddr) {
 82		printk(KERN_CRIT "Could not get gpio node address\n");
 83		ret = -ENODEV;
 84		goto err_gpio;
 85	}
 86	/* Disable USB, through the BCSR7 bits */
 87	setbits8(&bcsr[7], BCSR_USB_EN);
 88
 89	/* Wait for a while after reset */
 90	msleep(100);
 91
 92	/* Enable USB here */
 93	clrbits8(&bcsr[7], BCSR_USB_EN);
 94
 95	/*
 96	 * Configure multiplexed gpio16 and gpio19 as alternate1 output
 97	 * source after USB reset. In this configuration gpio16 will be
 98	 * USB2HStop and gpio19 will be USB2DStop. For more details refer to
 99	 * table 34-7 of PPC460EX user manual.
100	 */
101	setbits32((vaddr + GPIO0_OSRH), 0x42000000);
102	setbits32((vaddr + GPIO0_TSRH), 0x42000000);
103err_gpio:
104	iounmap(vaddr);
105err_bcsr:
106	iounmap(bcsr);
107	return ret;
108}
109machine_device_initcall(canyonlands, ppc460ex_canyonlands_fixup);
110define_machine(canyonlands) {
111	.name = "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	.calibrate_decr = generic_calibrate_decr,
118};