LXR linux/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/module.h>
  30#include <linux/interrupt.h>
  31#include <linux/fsl_devices.h>
  32#include <linux/of_platform.h>
  33
  34#include <asm/system.h>
  35#include <asm/pgtable.h>
  36#include <asm/page.h>
  37#include <asm/atomic.h>
  38#include <asm/time.h>
  39#include <asm/io.h>
  40#include <asm/machdep.h>
  41#include <asm/ipic.h>
  42#include <asm/pci-bridge.h>
  43#include <asm/irq.h>
  44#include <mm/mmu_decl.h>
  45#include <asm/prom.h>
  46#include <asm/udbg.h>
  47#include <asm/mpic.h>
  48
  49#include <sysdev/fsl_soc.h>
  50#include <sysdev/fsl_pci.h>
  51
  52static int sbc_rev;
  53
  54static void __init sbc8548_pic_init(void)
  55{
  56        struct mpic *mpic;
  57        struct resource r;
  58        struct device_node *np = NULL;
  59
  60        np = of_find_node_by_type(np, "open-pic");
  61
  62        if (np == NULL) {
  63                printk(KERN_ERR "Could not find open-pic node\n");
  64                return;
  65        }
  66
  67        if (of_address_to_resource(np, 0, &r)) {
  68                printk(KERN_ERR "Failed to map mpic register space\n");
  69                of_node_put(np);
  70                return;
  71        }
  72
  73        mpic = mpic_alloc(np, r.start,
  74                        MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
  75                        0, 256, " OpenPIC  ");
  76        BUG_ON(mpic == NULL);
  77
  78        /* Return the mpic node */
  79        of_node_put(np);
  80
  81        mpic_init(mpic);
  82}
  83
  84/* Extract the HW Rev from the EPLD on the board */
  85static int __init sbc8548_hw_rev(void)
  86{
  87        struct device_node *np;
  88        struct resource res;
  89        unsigned int *rev;
  90        int board_rev = 0;
  91
  92        np = of_find_compatible_node(NULL, NULL, "hw-rev");
  93        if (np == NULL) {
  94                printk("No HW-REV found in DTB.\n");
  95                return -ENODEV;
  96        }
  97
  98        of_address_to_resource(np, 0, &res);
  99        of_node_put(np);
 100
 101        rev = ioremap(res.start,sizeof(unsigned int));
 102        board_rev = (*rev) >> 28;
 103        iounmap(rev);
 104
 105        return board_rev;
 106}
 107
 108/*
 109 * Setup the architecture
 110 */
 111static void __init sbc8548_setup_arch(void)
 112{
 113#ifdef CONFIG_PCI
 114        struct device_node *np;
 115#endif
 116
 117        if (ppc_md.progress)
 118                ppc_md.progress("sbc8548_setup_arch()", 0);
 119
 120#ifdef CONFIG_PCI
 121        for_each_node_by_type(np, "pci") {
 122                if (of_device_is_compatible(np, "fsl,mpc8540-pci") ||
 123                    of_device_is_compatible(np, "fsl,mpc8548-pcie")) {
 124                        struct resource rsrc;
 125                        of_address_to_resource(np, 0, &rsrc);
 126                        if ((rsrc.start & 0xfffff) == 0x8000)
 127                                fsl_add_bridge(np, 1);
 128                        else
 129                                fsl_add_bridge(np, 0);
 130                }
 131        }
 132#endif
 133        sbc_rev = sbc8548_hw_rev();
 134}
 135
 136static void sbc8548_show_cpuinfo(struct seq_file *m)
 137{
 138        uint pvid, svid, phid1;
 139
 140        pvid = mfspr(SPRN_PVR);
 141        svid = mfspr(SPRN_SVR);
 142
 143        seq_printf(m, "Vendor\t\t: Wind River\n");
 144        seq_printf(m, "Machine\t\t: SBC8548 v%d\n", sbc_rev);
 145        seq_printf(m, "PVR\t\t: 0x%x\n", pvid);
 146        seq_printf(m, "SVR\t\t: 0x%x\n", svid);
 147
 148        /* Display cpu Pll setting */
 149        phid1 = mfspr(SPRN_HID1);
 150        seq_printf(m, "PLL setting\t: 0x%x\n", ((phid1 >> 24) & 0x3f));
 151}
 152
 153static struct of_device_id __initdata of_bus_ids[] = {
 154        { .name = "soc", },
 155        { .type = "soc", },
 156        { .compatible = "simple-bus", },
 157        { .compatible = "gianfar", },
 158        {},
 159};
 160
 161static int __init declare_of_platform_devices(void)
 162{
 163        of_platform_bus_probe(NULL, of_bus_ids, NULL);
 164
 165        return 0;
 166}
 167machine_device_initcall(sbc8548, declare_of_platform_devices);
 168
 169/*
 170 * Called very early, device-tree isn't unflattened
 171 */
 172static int __init sbc8548_probe(void)
 173{
 174        unsigned long root = of_get_flat_dt_root();
 175
 176        return of_flat_dt_is_compatible(root, "SBC8548");
 177}
 178
 179define_machine(sbc8548) {
 180        .name           = "SBC8548",
 181        .probe          = sbc8548_probe,
 182        .setup_arch     = sbc8548_setup_arch,
 183        .init_IRQ       = sbc8548_pic_init,
 184        .show_cpuinfo   = sbc8548_show_cpuinfo,
 185        .get_irq        = mpic_get_irq,
 186        .restart        = fsl_rstcr_restart,
 187#ifdef CONFIG_PCI
 188        .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 189#endif
 190        .calibrate_decr = generic_calibrate_decr,
 191        .progress       = udbg_progress,
 192};
 193