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