arch/powerpc/platforms/85xx/sbc8548.c

   1 /*
   2  * Wind River SBC8548 setup and early boot code.
   3  *
   4  * Copyright 2007 Wind River Systems Inc.
   5  *
   6  * By Paul Gortmaker (see MAINTAINERS for contact information)
   7  *
   8  * Based largely on the MPC8548CDS support - Copyright 2005 Freescale Inc.
   9  *
  10  *
  11  * This program is free software; you can redistribute  it and/or modify it
  12  * under  the terms of  the GNU General  Public License as published by the
  13  * Free Software Foundation;  either version 2 of the  License, or (at your
  14  * option) any later version.
  15  */
  16
  17 #include <linux/stddef.h>
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/errno.h>
  21 #include <linux/reboot.h>
  22 #include <linux/pci.h>
  23 #include <linux/kdev_t.h>
  24 #include <linux/major.h>
  25 #include <linux/console.h>
  26 #include <linux/delay.h>
  27 #include <linux/seq_file.h>
  28 #include <linux/initrd.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/fsl_devices.h>
  31 #include <linux/of_platform.h>
  32
  33 #include <asm/pgtable.h>
  34 #include <asm/page.h>
  35 #include <linux/atomic.h>
  36 #include <asm/time.h>
  37 #include <asm/io.h>
  38 #include <asm/machdep.h>
  39 #include <asm/ipic.h>
  40 #include <asm/pci-bridge.h>
  41 #include <asm/irq.h>
  42 #include <mm/mmu_decl.h>
  43 #include <asm/prom.h>
  44 #include <asm/udbg.h>
  45 #include <asm/mpic.h>
  46
  47 #include <sysdev/fsl_soc.h>
  48 #include <sysdev/fsl_pci.h>
  49
  50 #include "mpc85xx.h"
  51
  52 static int sbc_rev;
  53
  54 static void __init sbc8548_pic_init(void)
  55 {
  56         struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN,
  57                         0, 256, " OpenPIC  ");
  58         BUG_ON(mpic == NULL);
  59         mpic_init(mpic);
  60 }
  61
  62 /* Extract the HW Rev from the EPLD on the board */
  63 static int __init sbc8548_hw_rev(void)
  64 {
  65         struct device_node *np;
  66         struct resource res;
  67         unsigned int *rev;
  68         int board_rev = 0;
  69
  70         np = of_find_compatible_node(NULL, NULL, "hw-rev");
  71         if (np == NULL) {
  72                 printk("No HW-REV found in DTB.\n");
  73                 return -ENODEV;
  74         }
  75
  76         of_address_to_resource(np, 0, &res);
  77         of_node_put(np);
  78
  79         rev = ioremap(res.start,sizeof(unsigned int));
  80         board_rev = (*rev) >> 28;
  81         iounmap(rev);
  82
  83         return board_rev;
  84 }
  85
  86 /*
  87  * Setup the architecture
  88  */
  89 static void __init sbc8548_setup_arch(void)
  90 {
  91 #ifdef CONFIG_PCI
  92         struct device_node *np;
  93 #endif
  94
  95         if (ppc_md.progress)
  96                 ppc_md.progress("sbc8548_setup_arch()", 0);
  97
  98 #ifdef CONFIG_PCI
  99         for_each_node_by_type(np, "pci") {
 100                 if (of_device_is_compatible(np, "fsl,mpc8540-pci") ||
 101                     of_device_is_compatible(np, "fsl,mpc8548-pcie")) {
 102                         struct resource rsrc;
 103                         of_address_to_resource(np, 0, &rsrc);
 104                         if ((rsrc.start & 0xfffff) == 0x8000)
 105                                 fsl_add_bridge(np, 1);
 106                         else
 107                                 fsl_add_bridge(np, 0);
 108                 }
 109         }
 110 #endif
 111         sbc_rev = sbc8548_hw_rev();
 112 }
 113
 114 static void sbc8548_show_cpuinfo(struct seq_file *m)
 115 {
 116         uint pvid, svid, phid1;
 117
 118         pvid = mfspr(SPRN_PVR);
 119         svid = mfspr(SPRN_SVR);
 120
 121         seq_printf(m, "Vendor\t\t: Wind River\n");
 122         seq_printf(m, "Machine\t\t: SBC8548 v%d\n", sbc_rev);
 123         seq_printf(m, "PVR\t\t: 0x%x\n", pvid);
 124         seq_printf(m, "SVR\t\t: 0x%x\n", svid);
 125
 126         /* Display cpu Pll setting */
 127         phid1 = mfspr(SPRN_HID1);
 128         seq_printf(m, "PLL setting\t: 0x%x\n", ((phid1 >> 24) & 0x3f));
 129 }
 130
 131 machine_device_initcall(sbc8548, mpc85xx_common_publish_devices);
 132
 133 /*
 134  * Called very early, device-tree isn't unflattened
 135  */
 136 static int __init sbc8548_probe(void)
 137 {
 138         unsigned long root = of_get_flat_dt_root();
 139
 140         return of_flat_dt_is_compatible(root, "SBC8548");
 141 }
 142
 143 define_machine(sbc8548) {
 144         .name           = "SBC8548",
 145         .probe          = sbc8548_probe,
 146         .setup_arch     = sbc8548_setup_arch,
 147         .init_IRQ       = sbc8548_pic_init,
 148         .show_cpuinfo   = sbc8548_show_cpuinfo,
 149         .get_irq        = mpic_get_irq,
 150         .restart        = fsl_rstcr_restart,
 151 #ifdef CONFIG_PCI
 152         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 153 #endif
 154         .calibrate_decr = generic_calibrate_decr,
 155         .progress       = udbg_progress,
 156 };