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