cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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canyonlands.c (2825B)

      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	if (of_machine_is_compatible("amcc,canyonlands")) {
     43		pci_set_flags(PCI_REASSIGN_ALL_RSRC);
     44		return 1;
     45	}
     46	return 0;
     47}
     48
     49/* USB PHY fixup code on Canyonlands kit. */
     50
     51static int __init ppc460ex_canyonlands_fixup(void)
     52{
     53	u8 __iomem *bcsr ;
     54	void __iomem *vaddr;
     55	struct device_node *np;
     56	int ret = 0;
     57
     58	np = of_find_compatible_node(NULL, NULL, "amcc,ppc460ex-bcsr");
     59	if (!np) {
     60		printk(KERN_ERR "failed did not find amcc, ppc460ex bcsr node\n");
     61		return -ENODEV;
     62	}
     63
     64	bcsr = of_iomap(np, 0);
     65	of_node_put(np);
     66
     67	if (!bcsr) {
     68		printk(KERN_CRIT "Could not remap bcsr\n");
     69		ret = -ENODEV;
     70		goto err_bcsr;
     71	}
     72
     73	np = of_find_compatible_node(NULL, NULL, "ibm,ppc4xx-gpio");
     74	if (!np) {
     75		printk(KERN_ERR "failed did not find ibm,ppc4xx-gpio node\n");
     76		return -ENODEV;
     77	}
     78
     79	vaddr = of_iomap(np, 0);
     80	of_node_put(np);
     81
     82	if (!vaddr) {
     83		printk(KERN_CRIT "Could not get gpio node address\n");
     84		ret = -ENODEV;
     85		goto err_gpio;
     86	}
     87	/* Disable USB, through the BCSR7 bits */
     88	setbits8(&bcsr[7], BCSR_USB_EN);
     89
     90	/* Wait for a while after reset */
     91	msleep(100);
     92
     93	/* Enable USB here */
     94	clrbits8(&bcsr[7], BCSR_USB_EN);
     95
     96	/*
     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.
    101	 */
    102	setbits32((vaddr + GPIO0_OSRH), 0x42000000);
    103	setbits32((vaddr + GPIO0_TSRH), 0x42000000);
    104err_gpio:
    105	iounmap(vaddr);
    106err_bcsr:
    107	iounmap(bcsr);
    108	return ret;
    109}
    110machine_device_initcall(canyonlands, ppc460ex_canyonlands_fixup);
    111define_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,
    119};