arch/powerpc/platforms/86xx/mpc86xx_hpcn.c

   1 /*
   2  * MPC86xx HPCN board specific routines
   3  *
   4  * Recode: ZHANG WEI <wei.zhang@freescale.com>
   5  * Initial author: Xianghua Xiao <x.xiao@freescale.com>
   6  *
   7  * Copyright 2006 Freescale Semiconductor Inc.
   8  *
   9  * This program is free software; you can redistribute  it and/or modify it
  10  * under  the terms of  the GNU General  Public License as published by the
  11  * Free Software Foundation;  either version 2 of the  License, or (at your
  12  * option) any later version.
  13  */
  14
  15 #include <linux/stddef.h>
  16 #include <linux/kernel.h>
  17 #include <linux/pci.h>
  18 #include <linux/kdev_t.h>
  19 #include <linux/delay.h>
  20 #include <linux/seq_file.h>
  21 #include <linux/of_platform.h>
  22 #include <linux/memblock.h>
  23
  24 #include <asm/system.h>
  25 #include <asm/time.h>
  26 #include <asm/machdep.h>
  27 #include <asm/pci-bridge.h>
  28 #include <asm/prom.h>
  29 #include <mm/mmu_decl.h>
  30 #include <asm/udbg.h>
  31 #include <asm/swiotlb.h>
  32
  33 #include <asm/mpic.h>
  34
  35 #include <sysdev/fsl_pci.h>
  36 #include <sysdev/fsl_soc.h>
  37
  38 #include "mpc86xx.h"
  39
  40 #undef DEBUG
  41
  42 #ifdef DEBUG
  43 #define DBG(fmt...) do { printk(KERN_ERR fmt); } while(0)
  44 #else
  45 #define DBG(fmt...) do { } while(0)
  46 #endif
  47
  48 #ifdef CONFIG_PCI
  49 extern int uli_exclude_device(struct pci_controller *hose,
  50                                 u_char bus, u_char devfn);
  51
  52 static int mpc86xx_exclude_device(struct pci_controller *hose,
  53                                    u_char bus, u_char devfn)
  54 {
  55         struct device_node* node;
  56         struct resource rsrc;
  57
  58         node = hose->dn;
  59         of_address_to_resource(node, 0, &rsrc);
  60
  61         if ((rsrc.start & 0xfffff) == 0x8000) {
  62                 return uli_exclude_device(hose, bus, devfn);
  63         }
  64
  65         return PCIBIOS_SUCCESSFUL;
  66 }
  67 #endif /* CONFIG_PCI */
  68
  69
  70 static void __init
  71 mpc86xx_hpcn_setup_arch(void)
  72 {
  73 #ifdef CONFIG_PCI
  74         struct device_node *np;
  75         struct pci_controller *hose;
  76 #endif
  77         dma_addr_t max = 0xffffffff;
  78
  79         if (ppc_md.progress)
  80                 ppc_md.progress("mpc86xx_hpcn_setup_arch()", 0);
  81
  82 #ifdef CONFIG_PCI
  83         for_each_compatible_node(np, "pci", "fsl,mpc8641-pcie") {
  84                 struct resource rsrc;
  85                 of_address_to_resource(np, 0, &rsrc);
  86                 if ((rsrc.start & 0xfffff) == 0x8000)
  87                         fsl_add_bridge(np, 1);
  88                 else
  89                         fsl_add_bridge(np, 0);
  90                 hose = pci_find_hose_for_OF_device(np);
  91                 max = min(max, hose->dma_window_base_cur +
  92                           hose->dma_window_size);
  93         }
  94
  95         ppc_md.pci_exclude_device = mpc86xx_exclude_device;
  96
  97 #endif
  98
  99         printk("MPC86xx HPCN board from Freescale Semiconductor\n");
 100
 101 #ifdef CONFIG_SMP
 102         mpc86xx_smp_init();
 103 #endif
 104
 105 #ifdef CONFIG_SWIOTLB
 106         if (memblock_end_of_DRAM() > max) {
 107                 ppc_swiotlb_enable = 1;
 108                 set_pci_dma_ops(&swiotlb_dma_ops);
 109                 ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_swiotlb;
 110         }
 111 #endif
 112 }
 113
 114
 115 static void
 116 mpc86xx_hpcn_show_cpuinfo(struct seq_file *m)
 117 {
 118         uint svid = mfspr(SPRN_SVR);
 119
 120         seq_printf(m, "Vendor\t\t: Freescale Semiconductor\n");
 121
 122         seq_printf(m, "SVR\t\t: 0x%x\n", svid);
 123 }
 124
 125
 126 /*
 127  * Called very early, device-tree isn't unflattened
 128  */
 129 static int __init mpc86xx_hpcn_probe(void)
 130 {
 131         unsigned long root = of_get_flat_dt_root();
 132
 133         if (of_flat_dt_is_compatible(root, "fsl,mpc8641hpcn"))
 134                 return 1;       /* Looks good */
 135
 136         /* Be nice and don't give silent boot death.  Delete this in 2.6.27 */
 137         if (of_flat_dt_is_compatible(root, "mpc86xx")) {
 138                 pr_warning("WARNING: your dts/dtb is old. You must update before the next kernel release\n");
 139                 return 1;
 140         }
 141
 142         return 0;
 143 }
 144
 145 static long __init
 146 mpc86xx_time_init(void)
 147 {
 148         unsigned int temp;
 149
 150         /* Set the time base to zero */
 151         mtspr(SPRN_TBWL, 0);
 152         mtspr(SPRN_TBWU, 0);
 153
 154         temp = mfspr(SPRN_HID0);
 155         temp |= HID0_TBEN;
 156         mtspr(SPRN_HID0, temp);
 157         asm volatile("isync");
 158
 159         return 0;
 160 }
 161
 162 static __initdata struct of_device_id of_bus_ids[] = {
 163         { .compatible = "simple-bus", },
 164         { .compatible = "fsl,srio", },
 165         { .compatible = "gianfar", },
 166         {},
 167 };
 168
 169 static int __init declare_of_platform_devices(void)
 170 {
 171         of_platform_bus_probe(NULL, of_bus_ids, NULL);
 172
 173         return 0;
 174 }
 175 machine_device_initcall(mpc86xx_hpcn, declare_of_platform_devices);
 176 machine_arch_initcall(mpc86xx_hpcn, swiotlb_setup_bus_notifier);
 177
 178 define_machine(mpc86xx_hpcn) {
 179         .name                   = "MPC86xx HPCN",
 180         .probe                  = mpc86xx_hpcn_probe,
 181         .setup_arch             = mpc86xx_hpcn_setup_arch,
 182         .init_IRQ               = mpc86xx_init_irq,
 183         .show_cpuinfo           = mpc86xx_hpcn_show_cpuinfo,
 184         .get_irq                = mpic_get_irq,
 185         .restart                = fsl_rstcr_restart,
 186         .time_init              = mpc86xx_time_init,
 187         .calibrate_decr         = generic_calibrate_decr,
 188         .progress               = udbg_progress,
 189 #ifdef CONFIG_PCI
 190         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 191 #endif
 192 };