linux/arch/powerpc/platforms/44x/canyonlands.c
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   1/*
   2 * This contain platform specific code for APM PPC460EX based Canyonlands
   3 * board.
   4 *
   5 * Copyright (c) 2010, Applied Micro Circuits Corporation
   6 * Author: Rupjyoti Sarmah <rsarmah@apm.com>
   7 *
   8 * This program is free software; you can redistribute it and/or
   9 * modify it under the terms of the GNU General Public License as
  10 * published by the Free Software Foundation; either version 2 of
  11 * the License, or (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21 * MA 02111-1307 USA
  22 *
  23 */
  24#include <linux/kernel.h>
  25#include <linux/init.h>
  26#include <asm/pci-bridge.h>
  27#include <asm/ppc4xx.h>
  28#include <asm/udbg.h>
  29#include <asm/uic.h>
  30#include <linux/of_platform.h>
  31#include <linux/delay.h>
  32#include "44x.h"
  33
  34#define BCSR_USB_EN     0x11
  35
  36static __initdata struct of_device_id ppc460ex_of_bus[] = {
  37        { .compatible = "ibm,plb4", },
  38        { .compatible = "ibm,opb", },
  39        { .compatible = "ibm,ebc", },
  40        { .compatible = "simple-bus", },
  41        {},
  42};
  43
  44static int __init ppc460ex_device_probe(void)
  45{
  46        of_platform_bus_probe(NULL, ppc460ex_of_bus, NULL);
  47
  48        return 0;
  49}
  50machine_device_initcall(canyonlands, ppc460ex_device_probe);
  51
  52/* Using this code only for the Canyonlands board.  */
  53
  54static int __init ppc460ex_probe(void)
  55{
  56        unsigned long root = of_get_flat_dt_root();
  57        if (of_flat_dt_is_compatible(root, "amcc,canyonlands")) {
  58                pci_set_flags(PCI_REASSIGN_ALL_RSRC);
  59                return 1;
  60                }
  61        return 0;
  62}
  63
  64/* USB PHY fixup code on Canyonlands kit. */
  65
  66static int __init ppc460ex_canyonlands_fixup(void)
  67{
  68        u8 __iomem *bcsr ;
  69        void __iomem *vaddr;
  70        struct device_node *np;
  71        int ret = 0;
  72
  73        np = of_find_compatible_node(NULL, NULL, "amcc,ppc460ex-bcsr");
  74        if (!np) {
  75                printk(KERN_ERR "failed did not find amcc, ppc460ex bcsr node\n");
  76                return -ENODEV;
  77        }
  78
  79        bcsr = of_iomap(np, 0);
  80        of_node_put(np);
  81
  82        if (!bcsr) {
  83                printk(KERN_CRIT "Could not remap bcsr\n");
  84                ret = -ENODEV;
  85                goto err_bcsr;
  86        }
  87
  88        np = of_find_compatible_node(NULL, NULL, "ibm,ppc4xx-gpio");
  89        if (!np) {
  90                printk(KERN_ERR "failed did not find ibm,ppc4xx-gpio node\n");
  91                return -ENODEV;
  92        }
  93
  94        vaddr = of_iomap(np, 0);
  95        of_node_put(np);
  96
  97        if (!vaddr) {
  98                printk(KERN_CRIT "Could not get gpio node address\n");
  99                ret = -ENODEV;
 100                goto err_gpio;
 101        }
 102        /* Disable USB, through the BCSR7 bits */
 103        setbits8(&bcsr[7], BCSR_USB_EN);
 104
 105        /* Wait for a while after reset */
 106        msleep(100);
 107
 108        /* Enable USB here */
 109        clrbits8(&bcsr[7], BCSR_USB_EN);
 110
 111        /*
 112         * Configure multiplexed gpio16 and gpio19 as alternate1 output
 113         * source after USB reset. In this configuration gpio16 will be
 114         * USB2HStop and gpio19 will be USB2DStop. For more details refer to
 115         * table 34-7 of PPC460EX user manual.
 116         */
 117        setbits32((vaddr + GPIO0_OSRH), 0x42000000);
 118        setbits32((vaddr + GPIO0_TSRH), 0x42000000);
 119err_gpio:
 120        iounmap(vaddr);
 121err_bcsr:
 122        iounmap(bcsr);
 123        return ret;
 124}
 125machine_device_initcall(canyonlands, ppc460ex_canyonlands_fixup);
 126define_machine(canyonlands) {
 127        .name = "Canyonlands",
 128        .probe = ppc460ex_probe,
 129        .progress = udbg_progress,
 130        .init_IRQ = uic_init_tree,
 131        .get_irq = uic_get_irq,
 132        .restart = ppc4xx_reset_system,
 133        .calibrate_decr = generic_calibrate_decr,
 134};
 135