canyonlands.c

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/*
 * This contain platform specific code for APM PPC460EX based Canyonlands
 * board.
 *
 * Copyright (c) 2010, Applied Micro Circuits Corporation
 * Author: Rupjyoti Sarmah <[email protected]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/pci-bridge.h>
#include <asm/ppc4xx.h>
#include <asm/udbg.h>
#include <asm/uic.h>
#include <linux/of_platform.h>
#include <linux/delay.h>
#include "44x.h"

#define BCSR_USB_EN 0x11

static __initdata struct of_device_id ppc460ex_of_bus[] = {
    { .compatible = "ibm,plb4", },
    { .compatible = "ibm,opb", },
    { .compatible = "ibm,ebc", },
    { .compatible = "simple-bus", },
    {},
};

static int __init ppc460ex_device_probe(void)
{
    of_platform_bus_probe(NULL, ppc460ex_of_bus, NULL);

    return 0;
}
machine_device_initcall(canyonlands, ppc460ex_device_probe);

/* Using this code only for the Canyonlands board.  */

static int __init ppc460ex_probe(void)
{
    unsigned long root = of_get_flat_dt_root();
    if (of_flat_dt_is_compatible(root, "amcc,canyonlands")) {
        pci_set_flags(PCI_REASSIGN_ALL_RSRC);
        return 1;
        }
    return 0;
}

/* USB PHY fixup code on Canyonlands kit. */

static int __init ppc460ex_canyonlands_fixup(void)
{
    u8 __iomem *bcsr ;
    void __iomem *vaddr;
    struct device_node *np;
    int ret = 0;

    np = of_find_compatible_node(NULL, NULL, "amcc,ppc460ex-bcsr");
    if (!np) {
        printk(KERN_ERR "failed did not find amcc, ppc460ex bcsr node\n");
        return -ENODEV;
    }

    bcsr = of_iomap(np, 0);
    of_node_put(np);

    if (!bcsr) {
        printk(KERN_CRIT "Could not remap bcsr\n");
        ret = -ENODEV;
        goto err_bcsr;
    }

    np = of_find_compatible_node(NULL, NULL, "ibm,ppc4xx-gpio");
    if (!np) {
        printk(KERN_ERR "failed did not find ibm,ppc4xx-gpio node\n");
        return -ENODEV;
    }

    vaddr = of_iomap(np, 0);
    of_node_put(np);

    if (!vaddr) {
        printk(KERN_CRIT "Could not get gpio node address\n");
        ret = -ENODEV;
        goto err_gpio;
    }
    /* Disable USB, through the BCSR7 bits */
    setbits8(&bcsr[7], BCSR_USB_EN);

    /* Wait for a while after reset */
    msleep(100);

    /* Enable USB here */
    clrbits8(&bcsr[7], BCSR_USB_EN);

    /*
     * Configure multiplexed gpio16 and gpio19 as alternate1 output
     * source after USB reset. In this configuration gpio16 will be
     * USB2HStop and gpio19 will be USB2DStop. For more details refer to
     * table 34-7 of PPC460EX user manual.
     */
    setbits32((vaddr + GPIO0_OSRH), 0x42000000);
    setbits32((vaddr + GPIO0_TSRH), 0x42000000);
err_gpio:
    iounmap(vaddr);
err_bcsr:
    iounmap(bcsr);
    return ret;
}
machine_device_initcall(canyonlands, ppc460ex_canyonlands_fixup);
define_machine(canyonlands) {
    .name = "Canyonlands",
    .probe = ppc460ex_probe,
    .progress = udbg_progress,
    .init_IRQ = uic_init_tree,
    .get_irq = uic_get_irq,
    .restart = ppc4xx_reset_system,
    .calibrate_decr = generic_calibrate_decr,
};