release/src-rt-6.x.4708/linux/linux-2.6.36/arch/powerpc/platforms/85xx/mpc8536_ds.c

   1 /*
   2  * MPC8536 DS Board Setup
   3  *
   4  * Copyright 2008 Freescale Semiconductor, Inc.
   5  *
   6  * This program is free software; you can redistribute  it and/or modify it
   7  * under  the terms of  the GNU General  Public License as published by the
   8  * Free Software Foundation;  either version 2 of the  License, or (at your
   9  * option) any later version.
  10  */
  11
  12 #include <linux/stddef.h>
  13 #include <linux/kernel.h>
  14 #include <linux/pci.h>
  15 #include <linux/kdev_t.h>
  16 #include <linux/delay.h>
  17 #include <linux/seq_file.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/memblock.h>
  21
  22 #include <asm/system.h>
  23 #include <asm/time.h>
  24 #include <asm/machdep.h>
  25 #include <asm/pci-bridge.h>
  26 #include <mm/mmu_decl.h>
  27 #include <asm/prom.h>
  28 #include <asm/udbg.h>
  29 #include <asm/mpic.h>
  30 #include <asm/swiotlb.h>
  31
  32 #include <sysdev/fsl_soc.h>
  33 #include <sysdev/fsl_pci.h>
  34
  35 void __init mpc8536_ds_pic_init(void)
  36 {
  37         struct mpic *mpic;
  38         struct resource r;
  39         struct device_node *np;
  40
  41         np = of_find_node_by_type(NULL, "open-pic");
  42         if (np == NULL) {
  43                 printk(KERN_ERR "Could not find open-pic node\n");
  44                 return;
  45         }
  46
  47         if (of_address_to_resource(np, 0, &r)) {
  48                 printk(KERN_ERR "Failed to map mpic register space\n");
  49                 of_node_put(np);
  50                 return;
  51         }
  52
  53         mpic = mpic_alloc(np, r.start,
  54                           MPIC_PRIMARY | MPIC_WANTS_RESET |
  55                           MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS,
  56                         0, 256, " OpenPIC  ");
  57         BUG_ON(mpic == NULL);
  58         of_node_put(np);
  59
  60         mpic_init(mpic);
  61 }
  62
  63 /*
  64  * Setup the architecture
  65  */
  66 static void __init mpc8536_ds_setup_arch(void)
  67 {
  68 #ifdef CONFIG_PCI
  69         struct device_node *np;
  70         struct pci_controller *hose;
  71 #endif
  72         dma_addr_t max = 0xffffffff;
  73
  74         if (ppc_md.progress)
  75                 ppc_md.progress("mpc8536_ds_setup_arch()", 0);
  76
  77 #ifdef CONFIG_PCI
  78         for_each_node_by_type(np, "pci") {
  79                 if (of_device_is_compatible(np, "fsl,mpc8540-pci") ||
  80                     of_device_is_compatible(np, "fsl,mpc8548-pcie")) {
  81                         struct resource rsrc;
  82                         of_address_to_resource(np, 0, &rsrc);
  83                         if ((rsrc.start & 0xfffff) == 0x8000)
  84                                 fsl_add_bridge(np, 1);
  85                         else
  86                                 fsl_add_bridge(np, 0);
  87
  88                         hose = pci_find_hose_for_OF_device(np);
  89                         max = min(max, hose->dma_window_base_cur +
  90                                         hose->dma_window_size);
  91                 }
  92         }
  93
  94 #endif
  95
  96 #ifdef CONFIG_SWIOTLB
  97         if (memblock_end_of_DRAM() > max) {
  98                 ppc_swiotlb_enable = 1;
  99                 set_pci_dma_ops(&swiotlb_dma_ops);
 100                 ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_swiotlb;
 101         }
 102 #endif
 103
 104         printk("MPC8536 DS board from Freescale Semiconductor\n");
 105 }
 106
 107 static struct of_device_id __initdata mpc8536_ds_ids[] = {
 108         { .type = "soc", },
 109         { .compatible = "soc", },
 110         { .compatible = "simple-bus", },
 111         { .compatible = "gianfar", },
 112         {},
 113 };
 114
 115 static int __init mpc8536_ds_publish_devices(void)
 116 {
 117         return of_platform_bus_probe(NULL, mpc8536_ds_ids, NULL);
 118 }
 119 machine_device_initcall(mpc8536_ds, mpc8536_ds_publish_devices);
 120
 121 machine_arch_initcall(mpc8536_ds, swiotlb_setup_bus_notifier);
 122
 123 /*
 124  * Called very early, device-tree isn't unflattened
 125  */
 126 static int __init mpc8536_ds_probe(void)
 127 {
 128         unsigned long root = of_get_flat_dt_root();
 129
 130         return of_flat_dt_is_compatible(root, "fsl,mpc8536ds");
 131 }
 132
 133 define_machine(mpc8536_ds) {
 134         .name                   = "MPC8536 DS",
 135         .probe                  = mpc8536_ds_probe,
 136         .setup_arch             = mpc8536_ds_setup_arch,
 137         .init_IRQ               = mpc8536_ds_pic_init,
 138 #ifdef CONFIG_PCI
 139         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 140 #endif
 141         .get_irq                = mpic_get_irq,
 142         .restart                = fsl_rstcr_restart,
 143         .calibrate_decr         = generic_calibrate_decr,
 144         .progress               = udbg_progress,
 145 };