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

   1 /*
   2  * MPC8544 DS Board Setup
   3  *
   4  * Author Xianghua Xiao (x.xiao@freescale.com)
   5  * Copyright 2007 Freescale Semiconductor Inc.
   6  *
   7  * This program is free software; you can redistribute  it and/or modify it
   8  * under  the terms of  the GNU General  Public License as published by the
   9  * Free Software Foundation;  either version 2 of the  License, or (at your
  10  * option) any later version.
  11  */
  12
  13 #include <linux/stddef.h>
  14 #include <linux/kernel.h>
  15 #include <linux/kdev_t.h>
  16 #include <linux/delay.h>
  17 #include <linux/seq_file.h>
  18
  19 #include <asm/system.h>
  20 #include <asm/time.h>
  21 #include <asm/machdep.h>
  22 #include <asm/mpc85xx.h>
  23 #include <mm/mmu_decl.h>
  24 #include <asm/prom.h>
  25 #include <asm/udbg.h>
  26 #include <asm/mpic.h>
  27 #include <asm/i8259.h>
  28
  29 #include <sysdev/fsl_soc.h>
  30 #include "mpc85xx.h"
  31
  32 #undef DEBUG
  33
  34 #ifdef DEBUG
  35 #define DBG(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
  36 #else
  37 #define DBG(fmt, args...)
  38 #endif
  39
  40
  41 void __init mpc8544_ds_pic_init(void)
  42 {
  43         struct mpic *mpic;
  44         struct resource r;
  45         struct device_node *np = NULL;
  46 #ifdef CONFIG_PPC_I8259
  47         struct device_node *cascade_node = NULL;
  48         int cascade_irq;
  49 #endif
  50
  51         np = of_find_node_by_type(np, "open-pic");
  52
  53         if (np == NULL) {
  54                 printk(KERN_ERR "Could not find open-pic node\n");
  55                 return;
  56         }
  57
  58         if (of_address_to_resource(np, 0, &r)) {
  59                 printk(KERN_ERR "Failed to map mpic register space\n");
  60                 of_node_put(np);
  61                 return;
  62         }
  63
  64         /* Alloc mpic structure and per isu has 16 INT entries. */
  65         mpic = mpic_alloc(np, r.start,
  66                           MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
  67                           16, 64, " OPENPIC     ");
  68         BUG_ON(mpic == NULL);
  69
  70         /*
  71          * 48 Internal Interrupts
  72          */
  73         mpic_assign_isu(mpic, 0, r.start + 0x10200);
  74         mpic_assign_isu(mpic, 1, r.start + 0x10400);
  75         mpic_assign_isu(mpic, 2, r.start + 0x10600);
  76
  77         /*
  78          * 16 External interrupts
  79          */
  80         mpic_assign_isu(mpic, 3, r.start + 0x10000);
  81
  82         mpic_init(mpic);
  83
  84 #ifdef CONFIG_PPC_I8259
  85         /* Initialize the i8259 controller */
  86         for_each_node_by_type(np, "interrupt-controller")
  87             if (of_device_is_compatible(np, "chrp,iic")) {
  88                 cascade_node = np;
  89                 break;
  90         }
  91
  92         if (cascade_node == NULL) {
  93                 printk(KERN_DEBUG "Could not find i8259 PIC\n");
  94                 return;
  95         }
  96
  97         cascade_irq = irq_of_parse_and_map(cascade_node, 0);
  98         if (cascade_irq == NO_IRQ) {
  99                 printk(KERN_ERR "Failed to map cascade interrupt\n");
 100                 return;
 101         }
 102
 103         DBG("mpc8544ds: cascade mapped to irq %d\n", cascade_irq);
 104
 105         i8259_init(cascade_node, 0);
 106         of_node_put(cascade_node);
 107
 108         set_irq_chained_handler(cascade_irq, mpc8544_8259_cascade);
 109 #endif  /* CONFIG_PPC_I8259 */
 110 }
 111
 112
 113 /*
 114  * Setup the architecture
 115  */
 116 static void __init mpc8544_ds_setup_arch(void)
 117 {
 118         if (ppc_md.progress)
 119                 ppc_md.progress("mpc8544_ds_setup_arch()", 0);
 120
 121         printk("MPC8544 DS board from Freescale Semiconductor\n");
 122 }
 123
 124
 125 /*
 126  * Called very early, device-tree isn't unflattened
 127  */
 128 static int __init mpc8544_ds_probe(void)
 129 {
 130         unsigned long root = of_get_flat_dt_root();
 131
 132         return of_flat_dt_is_compatible(root, "MPC8544DS");
 133 }
 134
 135 define_machine(mpc8544_ds) {
 136         .name                   = "MPC8544 DS",
 137         .probe                  = mpc8544_ds_probe,
 138         .setup_arch             = mpc8544_ds_setup_arch,
 139         .init_IRQ               = mpc8544_ds_pic_init,
 140         .get_irq                = mpic_get_irq,
 141         .restart                = mpc85xx_restart,
 142         .calibrate_decr         = generic_calibrate_decr,
 143         .progress               = udbg_progress,
 144 };