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 <linux/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
  52 static int sbc_rev;
  53
  54 static 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 */
  85 static 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  */
 111 static 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
 136 static 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
 153 static struct of_device_id __initdata of_bus_ids[] = {
 154         { .name = "soc", },
 155         { .type = "soc", },
 156         { .compatible = "simple-bus", },
 157         { .compatible = "gianfar", },
 158         {},
 159 };
 160
 161 static int __init declare_of_platform_devices(void)
 162 {
 163         of_platform_bus_probe(NULL, of_bus_ids, NULL);
 164
 165         return 0;
 166 }
 167 machine_device_initcall(sbc8548, declare_of_platform_devices);
 168
 169 /*
 170  * Called very early, device-tree isn't unflattened
 171  */
 172 static 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
 179 define_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 };