arch/powerpc/platforms/44x/canyonlands.c

   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
  36 static const struct of_device_id ppc460ex_of_bus[] __initconst = {
  37         { .compatible = "ibm,plb4", },
  38         { .compatible = "ibm,opb", },
  39         { .compatible = "ibm,ebc", },
  40         { .compatible = "simple-bus", },
  41         {},
  42 };
  43
  44 static int __init ppc460ex_device_probe(void)
  45 {
  46         of_platform_bus_probe(NULL, ppc460ex_of_bus, NULL);
  47
  48         return 0;
  49 }
  50 machine_device_initcall(canyonlands, ppc460ex_device_probe);
  51
  52 /* Using this code only for the Canyonlands board.  */
  53
  54 static 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
  66 static 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);
 119 err_gpio:
 120         iounmap(vaddr);
 121 err_bcsr:
 122         iounmap(bcsr);
 123         return ret;
 124 }
 125 machine_device_initcall(canyonlands, ppc460ex_canyonlands_fixup);
 126 define_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 };