arch/powerpc/platforms/85xx/mpc85xx_ds.c

   1 /*
   2  * MPC85xx 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 <mm/mmu_decl.h>
  28 #include <asm/prom.h>
  29 #include <asm/udbg.h>
  30 #include <asm/mpic.h>
  31 #include <asm/i8259.h>
  32
  33 #include <sysdev/fsl_soc.h>
  34 #include <sysdev/fsl_pci.h>
  35
  36 #undef DEBUG
  37
  38 #ifdef DEBUG
  39 #define DBG(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
  40 #else
  41 #define DBG(fmt, args...)
  42 #endif
  43
  44 #ifdef CONFIG_PPC_I8259
  45 static void mpc85xx_8259_cascade(unsigned int irq, struct irq_desc *desc)
  46 {
  47         unsigned int cascade_irq = i8259_irq();
  48
  49         if (cascade_irq != NO_IRQ) {
  50                 generic_handle_irq(cascade_irq);
  51         }
  52         desc->chip->eoi(irq);
  53 }
  54 #endif  /* CONFIG_PPC_I8259 */
  55
  56 void __init mpc85xx_ds_pic_init(void)
  57 {
  58         struct mpic *mpic;
  59         struct resource r;
  60         struct device_node *np = NULL;
  61 #ifdef CONFIG_PPC_I8259
  62         struct device_node *cascade_node = NULL;
  63         int cascade_irq;
  64 #endif
  65
  66         np = of_find_node_by_type(np, "open-pic");
  67
  68         if (np == NULL) {
  69                 printk(KERN_ERR "Could not find open-pic node\n");
  70                 return;
  71         }
  72
  73         if (of_address_to_resource(np, 0, &r)) {
  74                 printk(KERN_ERR "Failed to map mpic register space\n");
  75                 of_node_put(np);
  76                 return;
  77         }
  78
  79         mpic = mpic_alloc(np, r.start,
  80                           MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
  81                         0, 256, " OpenPIC  ");
  82         BUG_ON(mpic == NULL);
  83
  84         mpic_init(mpic);
  85
  86 #ifdef CONFIG_PPC_I8259
  87         /* Initialize the i8259 controller */
  88         for_each_node_by_type(np, "interrupt-controller")
  89             if (of_device_is_compatible(np, "chrp,iic")) {
  90                 cascade_node = np;
  91                 break;
  92         }
  93
  94         if (cascade_node == NULL) {
  95                 printk(KERN_DEBUG "Could not find i8259 PIC\n");
  96                 return;
  97         }
  98
  99         cascade_irq = irq_of_parse_and_map(cascade_node, 0);
 100         if (cascade_irq == NO_IRQ) {
 101                 printk(KERN_ERR "Failed to map cascade interrupt\n");
 102                 return;
 103         }
 104
 105         DBG("mpc85xxds: cascade mapped to irq %d\n", cascade_irq);
 106
 107         i8259_init(cascade_node, 0);
 108         of_node_put(cascade_node);
 109
 110         set_irq_chained_handler(cascade_irq, mpc85xx_8259_cascade);
 111 #endif  /* CONFIG_PPC_I8259 */
 112 }
 113
 114 #ifdef CONFIG_PCI
 115 static int primary_phb_addr;
 116 extern int uses_fsl_uli_m1575;
 117 extern int uli_exclude_device(struct pci_controller *hose,
 118                                 u_char bus, u_char devfn);
 119
 120 static int mpc85xx_exclude_device(struct pci_controller *hose,
 121                                    u_char bus, u_char devfn)
 122 {
 123         struct device_node* node;
 124         struct resource rsrc;
 125
 126         node = hose->dn;
 127         of_address_to_resource(node, 0, &rsrc);
 128
 129         if ((rsrc.start & 0xfffff) == primary_phb_addr) {
 130                 return uli_exclude_device(hose, bus, devfn);
 131         }
 132
 133         return PCIBIOS_SUCCESSFUL;
 134 }
 135 #endif  /* CONFIG_PCI */
 136
 137 /*
 138  * Setup the architecture
 139  */
 140 static void __init mpc85xx_ds_setup_arch(void)
 141 {
 142 #ifdef CONFIG_PCI
 143         struct device_node *np;
 144 #endif
 145
 146         if (ppc_md.progress)
 147                 ppc_md.progress("mpc85xx_ds_setup_arch()", 0);
 148
 149 #ifdef CONFIG_PCI
 150         for_each_node_by_type(np, "pci") {
 151                 if (of_device_is_compatible(np, "fsl,mpc8540-pci") ||
 152                     of_device_is_compatible(np, "fsl,mpc8548-pcie")) {
 153                         struct resource rsrc;
 154                         of_address_to_resource(np, 0, &rsrc);
 155                         if ((rsrc.start & 0xfffff) == primary_phb_addr)
 156                                 fsl_add_bridge(np, 1);
 157                         else
 158                                 fsl_add_bridge(np, 0);
 159                 }
 160         }
 161
 162         uses_fsl_uli_m1575 = 1;
 163         ppc_md.pci_exclude_device = mpc85xx_exclude_device;
 164 #endif
 165
 166         printk("MPC85xx DS board from Freescale Semiconductor\n");
 167 }
 168
 169 /*
 170  * Called very early, device-tree isn't unflattened
 171  */
 172 static int __init mpc8544_ds_probe(void)
 173 {
 174         unsigned long root = of_get_flat_dt_root();
 175
 176         if (of_flat_dt_is_compatible(root, "MPC8544DS")) {
 177 #ifdef CONFIG_PCI
 178                 primary_phb_addr = 0xb000;
 179 #endif
 180                 return 1;
 181         } else {
 182                 return 0;
 183         }
 184 }
 185
 186 /*
 187  * Called very early, device-tree isn't unflattened
 188  */
 189 static int __init mpc8572_ds_probe(void)
 190 {
 191         unsigned long root = of_get_flat_dt_root();
 192
 193         if (of_flat_dt_is_compatible(root, "fsl,MPC8572DS")) {
 194 #ifdef CONFIG_PCI
 195                 primary_phb_addr = 0x8000;
 196 #endif
 197                 return 1;
 198         } else {
 199                 return 0;
 200         }
 201 }
 202
 203 define_machine(mpc8544_ds) {
 204         .name                   = "MPC8544 DS",
 205         .probe                  = mpc8544_ds_probe,
 206         .setup_arch             = mpc85xx_ds_setup_arch,
 207         .init_IRQ               = mpc85xx_ds_pic_init,
 208 #ifdef CONFIG_PCI
 209         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 210 #endif
 211         .get_irq                = mpic_get_irq,
 212         .restart                = fsl_rstcr_restart,
 213         .calibrate_decr         = generic_calibrate_decr,
 214         .progress               = udbg_progress,
 215 };
 216
 217 define_machine(mpc8572_ds) {
 218         .name                   = "MPC8572 DS",
 219         .probe                  = mpc8572_ds_probe,
 220         .setup_arch             = mpc85xx_ds_setup_arch,
 221         .init_IRQ               = mpc85xx_ds_pic_init,
 222 #ifdef CONFIG_PCI
 223         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 224 #endif
 225         .get_irq                = mpic_get_irq,
 226         .restart                = fsl_rstcr_restart,
 227         .calibrate_decr         = generic_calibrate_decr,
 228         .progress               = udbg_progress,
 229 };