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 #include <linux/of_platform.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 <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
  37 #undef DEBUG
  38
  39 #ifdef DEBUG
  40 #define DBG(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ## args)
  41 #else
  42 #define DBG(fmt, args...)
  43 #endif
  44
  45 #ifdef CONFIG_PPC_I8259
  46 static void mpc85xx_8259_cascade(unsigned int irq, struct irq_desc *desc)
  47 {
  48         unsigned int cascade_irq = i8259_irq();
  49
  50         if (cascade_irq != NO_IRQ) {
  51                 generic_handle_irq(cascade_irq);
  52         }
  53         desc->chip->eoi(irq);
  54 }
  55 #endif  /* CONFIG_PPC_I8259 */
  56
  57 void __init mpc85xx_ds_pic_init(void)
  58 {
  59         struct mpic *mpic;
  60         struct resource r;
  61         struct device_node *np;
  62 #ifdef CONFIG_PPC_I8259
  63         struct device_node *cascade_node = NULL;
  64         int cascade_irq;
  65 #endif
  66         unsigned long root = of_get_flat_dt_root();
  67
  68         np = of_find_node_by_type(NULL, "open-pic");
  69         if (np == NULL) {
  70                 printk(KERN_ERR "Could not find open-pic node\n");
  71                 return;
  72         }
  73
  74         if (of_address_to_resource(np, 0, &r)) {
  75                 printk(KERN_ERR "Failed to map mpic register space\n");
  76                 of_node_put(np);
  77                 return;
  78         }
  79
  80         if (of_flat_dt_is_compatible(root, "fsl,MPC8572DS-CAMP")) {
  81                 mpic = mpic_alloc(np, r.start,
  82                         MPIC_PRIMARY |
  83                         MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS,
  84                         0, 256, " OpenPIC  ");
  85         } else {
  86                 mpic = mpic_alloc(np, r.start,
  87                           MPIC_PRIMARY | MPIC_WANTS_RESET |
  88                           MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS |
  89                           MPIC_SINGLE_DEST_CPU,
  90                         0, 256, " OpenPIC  ");
  91         }
  92
  93         BUG_ON(mpic == NULL);
  94         of_node_put(np);
  95
  96         mpic_init(mpic);
  97
  98 #ifdef CONFIG_PPC_I8259
  99         /* Initialize the i8259 controller */
 100         for_each_node_by_type(np, "interrupt-controller")
 101             if (of_device_is_compatible(np, "chrp,iic")) {
 102                 cascade_node = np;
 103                 break;
 104         }
 105
 106         if (cascade_node == NULL) {
 107                 printk(KERN_DEBUG "Could not find i8259 PIC\n");
 108                 return;
 109         }
 110
 111         cascade_irq = irq_of_parse_and_map(cascade_node, 0);
 112         if (cascade_irq == NO_IRQ) {
 113                 printk(KERN_ERR "Failed to map cascade interrupt\n");
 114                 return;
 115         }
 116
 117         DBG("mpc85xxds: cascade mapped to irq %d\n", cascade_irq);
 118
 119         i8259_init(cascade_node, 0);
 120         of_node_put(cascade_node);
 121
 122         set_irq_chained_handler(cascade_irq, mpc85xx_8259_cascade);
 123 #endif  /* CONFIG_PPC_I8259 */
 124 }
 125
 126 #ifdef CONFIG_PCI
 127 static int primary_phb_addr;
 128 extern int uli_exclude_device(struct pci_controller *hose,
 129                                 u_char bus, u_char devfn);
 130
 131 static int mpc85xx_exclude_device(struct pci_controller *hose,
 132                                    u_char bus, u_char devfn)
 133 {
 134         struct device_node* node;
 135         struct resource rsrc;
 136
 137         node = hose->dn;
 138         of_address_to_resource(node, 0, &rsrc);
 139
 140         if ((rsrc.start & 0xfffff) == primary_phb_addr) {
 141                 return uli_exclude_device(hose, bus, devfn);
 142         }
 143
 144         return PCIBIOS_SUCCESSFUL;
 145 }
 146 #endif  /* CONFIG_PCI */
 147
 148 /*
 149  * Setup the architecture
 150  */
 151 static void __init mpc85xx_ds_setup_arch(void)
 152 {
 153 #ifdef CONFIG_PCI
 154         struct device_node *np;
 155 #endif
 156
 157         if (ppc_md.progress)
 158                 ppc_md.progress("mpc85xx_ds_setup_arch()", 0);
 159
 160 #ifdef CONFIG_PCI
 161         for_each_node_by_type(np, "pci") {
 162                 if (of_device_is_compatible(np, "fsl,mpc8540-pci") ||
 163                     of_device_is_compatible(np, "fsl,mpc8548-pcie")) {
 164                         struct resource rsrc;
 165                         of_address_to_resource(np, 0, &rsrc);
 166                         if ((rsrc.start & 0xfffff) == primary_phb_addr)
 167                                 fsl_add_bridge(np, 1);
 168                         else
 169                                 fsl_add_bridge(np, 0);
 170                 }
 171         }
 172
 173         ppc_md.pci_exclude_device = mpc85xx_exclude_device;
 174 #endif
 175
 176         printk("MPC85xx DS board from Freescale Semiconductor\n");
 177 }
 178
 179 /*
 180  * Called very early, device-tree isn't unflattened
 181  */
 182 static int __init mpc8544_ds_probe(void)
 183 {
 184         unsigned long root = of_get_flat_dt_root();
 185
 186         if (of_flat_dt_is_compatible(root, "MPC8544DS")) {
 187 #ifdef CONFIG_PCI
 188                 primary_phb_addr = 0xb000;
 189 #endif
 190                 return 1;
 191         } else {
 192                 return 0;
 193         }
 194 }
 195
 196 static struct of_device_id __initdata mpc85xxds_ids[] = {
 197         { .type = "soc", },
 198         { .compatible = "soc", },
 199         { .compatible = "simple-bus", },
 200         {},
 201 };
 202
 203 static int __init mpc85xxds_publish_devices(void)
 204 {
 205         return of_platform_bus_probe(NULL, mpc85xxds_ids, NULL);
 206 }
 207 machine_device_initcall(mpc8544_ds, mpc85xxds_publish_devices);
 208 machine_device_initcall(mpc8572_ds, mpc85xxds_publish_devices);
 209
 210 /*
 211  * Called very early, device-tree isn't unflattened
 212  */
 213 static int __init mpc8572_ds_probe(void)
 214 {
 215         unsigned long root = of_get_flat_dt_root();
 216
 217         if (of_flat_dt_is_compatible(root, "fsl,MPC8572DS")) {
 218 #ifdef CONFIG_PCI
 219                 primary_phb_addr = 0x8000;
 220 #endif
 221                 return 1;
 222         } else {
 223                 return 0;
 224         }
 225 }
 226
 227 define_machine(mpc8544_ds) {
 228         .name                   = "MPC8544 DS",
 229         .probe                  = mpc8544_ds_probe,
 230         .setup_arch             = mpc85xx_ds_setup_arch,
 231         .init_IRQ               = mpc85xx_ds_pic_init,
 232 #ifdef CONFIG_PCI
 233         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 234 #endif
 235         .get_irq                = mpic_get_irq,
 236         .restart                = fsl_rstcr_restart,
 237         .calibrate_decr         = generic_calibrate_decr,
 238         .progress               = udbg_progress,
 239 };
 240
 241 define_machine(mpc8572_ds) {
 242         .name                   = "MPC8572 DS",
 243         .probe                  = mpc8572_ds_probe,
 244         .setup_arch             = mpc85xx_ds_setup_arch,
 245         .init_IRQ               = mpc85xx_ds_pic_init,
 246 #ifdef CONFIG_PCI
 247         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 248 #endif
 249         .get_irq                = mpic_get_irq,
 250         .restart                = fsl_rstcr_restart,
 251         .calibrate_decr         = generic_calibrate_decr,
 252         .progress               = udbg_progress,
 253 };