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
  21 static 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
  29 static int __init ppc460ex_device_probe(void)
  30 {
  31         of_platform_bus_probe(NULL, ppc460ex_of_bus, NULL);
  32
  33         return 0;
  34 }
  35 machine_device_initcall(canyonlands, ppc460ex_device_probe);
  36
  37 /* Using this code only for the Canyonlands board.  */
  38
  39 static 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
  50 static 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);
 103 err_gpio:
 104         iounmap(vaddr);
 105 err_bcsr:
 106         iounmap(bcsr);
 107         return ret;
 108 }
 109 machine_device_initcall(canyonlands, ppc460ex_canyonlands_fixup);
 110 define_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 };