arch/powerpc/platforms/85xx/mpc8544_ds.c

   1 /*
   2  * MPC8544 DS Board Setup
   3  *
   4  * Author Xianghua Xiao (x.xiao@freescale.com)
   5  * Roy Zang <tie-fei.zang@freescale.com>
   6  *      - Add PCI/PCI Exprees support
   7  * Copyright 2007 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/interrupt.h>
  22
  23 #include <asm/system.h>
  24 #include <asm/time.h>
  25 #include <asm/machdep.h>
  26 #include <asm/pci-bridge.h>
  27 #include <asm/mpc85xx.h>
  28 #include <mm/mmu_decl.h>
  29 #include <asm/prom.h>
  30 #include <asm/udbg.h>
  31 #include <asm/mpic.h>
  32 #include <asm/i8259.h>
  33
  34 #include <sysdev/fsl_soc.h>
  35 #include <sysdev/fsl_pci.h>
  36 #include "mpc85xx.h"
  37
  38 #undef DEBUG
  39
  40 #ifdef DEBUG
  41 #define DBG(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
  42 #else
  43 #define DBG(fmt, args...)
  44 #endif
  45
  46 #ifdef CONFIG_PPC_I8259
  47 static void mpc8544_8259_cascade(unsigned int irq, struct irq_desc *desc)
  48 {
  49         unsigned int cascade_irq = i8259_irq();
  50
  51         if (cascade_irq != NO_IRQ) {
  52                 generic_handle_irq(cascade_irq);
  53         }
  54         desc->chip->eoi(irq);
  55 }
  56 #endif  /* CONFIG_PPC_I8259 */
  57
  58 void __init mpc8544_ds_pic_init(void)
  59 {
  60         struct mpic *mpic;
  61         struct resource r;
  62         struct device_node *np = NULL;
  63 #ifdef CONFIG_PPC_I8259
  64         struct device_node *cascade_node = NULL;
  65         int cascade_irq;
  66 #endif
  67
  68         np = of_find_node_by_type(np, "open-pic");
  69
  70         if (np == NULL) {
  71                 printk(KERN_ERR "Could not find open-pic node\n");
  72                 return;
  73         }
  74
  75         if (of_address_to_resource(np, 0, &r)) {
  76                 printk(KERN_ERR "Failed to map mpic register space\n");
  77                 of_node_put(np);
  78                 return;
  79         }
  80
  81         mpic = mpic_alloc(np, r.start,
  82                           MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
  83                         0, 256, " OpenPIC  ");
  84         BUG_ON(mpic == NULL);
  85
  86         mpic_init(mpic);
  87
  88 #ifdef CONFIG_PPC_I8259
  89         /* Initialize the i8259 controller */
  90         for_each_node_by_type(np, "interrupt-controller")
  91             if (of_device_is_compatible(np, "chrp,iic")) {
  92                 cascade_node = np;
  93                 break;
  94         }
  95
  96         if (cascade_node == NULL) {
  97                 printk(KERN_DEBUG "Could not find i8259 PIC\n");
  98                 return;
  99         }
 100
 101         cascade_irq = irq_of_parse_and_map(cascade_node, 0);
 102         if (cascade_irq == NO_IRQ) {
 103                 printk(KERN_ERR "Failed to map cascade interrupt\n");
 104                 return;
 105         }
 106
 107         DBG("mpc8544ds: cascade mapped to irq %d\n", cascade_irq);
 108
 109         i8259_init(cascade_node, 0);
 110         of_node_put(cascade_node);
 111
 112         set_irq_chained_handler(cascade_irq, mpc8544_8259_cascade);
 113 #endif  /* CONFIG_PPC_I8259 */
 114 }
 115
 116 #ifdef CONFIG_PCI
 117 extern int uses_fsl_uli_m1575;
 118 extern int uli_exclude_device(struct pci_controller *hose,
 119                                 u_char bus, u_char devfn);
 120
 121 static int mpc85xx_exclude_device(struct pci_controller *hose,
 122                                    u_char bus, u_char devfn)
 123 {
 124         struct device_node* node;
 125         struct resource rsrc;
 126
 127         node = (struct device_node *)hose->arch_data;
 128         of_address_to_resource(node, 0, &rsrc);
 129
 130         if ((rsrc.start & 0xfffff) == 0xb000) {
 131                 return uli_exclude_device(hose, bus, devfn);
 132         }
 133
 134         return PCIBIOS_SUCCESSFUL;
 135 }
 136 #endif  /* CONFIG_PCI */
 137
 138 /*
 139  * Setup the architecture
 140  */
 141 static void __init mpc8544_ds_setup_arch(void)
 142 {
 143 #ifdef CONFIG_PCI
 144         struct device_node *np;
 145 #endif
 146
 147         if (ppc_md.progress)
 148                 ppc_md.progress("mpc8544_ds_setup_arch()", 0);
 149
 150 #ifdef CONFIG_PCI
 151         for (np = NULL; (np = of_find_node_by_type(np, "pci")) != NULL;) {
 152                 struct resource rsrc;
 153                 of_address_to_resource(np, 0, &rsrc);
 154                 if ((rsrc.start & 0xfffff) == 0xb000)
 155                         fsl_add_bridge(np, 1);
 156                 else
 157                         fsl_add_bridge(np, 0);
 158         }
 159         uses_fsl_uli_m1575 = 1;
 160         ppc_md.pci_exclude_device = mpc85xx_exclude_device;
 161 #endif
 162
 163         printk("MPC8544 DS board from Freescale Semiconductor\n");
 164 }
 165
 166 /*
 167  * Called very early, device-tree isn't unflattened
 168  */
 169 static int __init mpc8544_ds_probe(void)
 170 {
 171         unsigned long root = of_get_flat_dt_root();
 172
 173         return of_flat_dt_is_compatible(root, "MPC8544DS");
 174 }
 175
 176 define_machine(mpc8544_ds) {
 177         .name                   = "MPC8544 DS",
 178         .probe                  = mpc8544_ds_probe,
 179         .setup_arch             = mpc8544_ds_setup_arch,
 180         .init_IRQ               = mpc8544_ds_pic_init,
 181         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 182         .get_irq                = mpic_get_irq,
 183         .restart                = mpc85xx_restart,
 184         .calibrate_decr         = generic_calibrate_decr,
 185         .progress               = udbg_progress,
 186 };