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
  67         np = of_find_node_by_type(NULL, "open-pic");
  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 |
  81                           MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS,
  82                         0, 256, " OpenPIC  ");
  83         BUG_ON(mpic == NULL);
  84         of_node_put(np);
  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("mpc85xxds: 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, mpc85xx_8259_cascade);
 113 #endif  /* CONFIG_PPC_I8259 */
 114 }
 115
 116 #ifdef CONFIG_PCI
 117 static int primary_phb_addr;
 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 = hose->dn;
 128         of_address_to_resource(node, 0, &rsrc);
 129
 130         if ((rsrc.start & 0xfffff) == primary_phb_addr) {
 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 mpc85xx_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("mpc85xx_ds_setup_arch()", 0);
 149
 150 #ifdef CONFIG_PCI
 151         for_each_node_by_type(np, "pci") {
 152                 if (of_device_is_compatible(np, "fsl,mpc8540-pci") ||
 153                     of_device_is_compatible(np, "fsl,mpc8548-pcie")) {
 154                         struct resource rsrc;
 155                         of_address_to_resource(np, 0, &rsrc);
 156                         if ((rsrc.start & 0xfffff) == primary_phb_addr)
 157                                 fsl_add_bridge(np, 1);
 158                         else
 159                                 fsl_add_bridge(np, 0);
 160                 }
 161         }
 162
 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 static struct of_device_id __initdata mpc85xxds_ids[] = {
 187         { .type = "soc", },
 188         { .compatible = "soc", },
 189         {},
 190 };
 191
 192 static int __init mpc85xxds_publish_devices(void)
 193 {
 194         return of_platform_bus_probe(NULL, mpc85xxds_ids, NULL);
 195 }
 196 machine_device_initcall(mpc8544_ds, mpc85xxds_publish_devices);
 197 machine_device_initcall(mpc8572_ds, mpc85xxds_publish_devices);
 198
 199 /*
 200  * Called very early, device-tree isn't unflattened
 201  */
 202 static int __init mpc8572_ds_probe(void)
 203 {
 204         unsigned long root = of_get_flat_dt_root();
 205
 206         if (of_flat_dt_is_compatible(root, "fsl,MPC8572DS")) {
 207 #ifdef CONFIG_PCI
 208                 primary_phb_addr = 0x8000;
 209 #endif
 210                 return 1;
 211         } else {
 212                 return 0;
 213         }
 214 }
 215
 216 define_machine(mpc8544_ds) {
 217         .name                   = "MPC8544 DS",
 218         .probe                  = mpc8544_ds_probe,
 219         .setup_arch             = mpc85xx_ds_setup_arch,
 220         .init_IRQ               = mpc85xx_ds_pic_init,
 221 #ifdef CONFIG_PCI
 222         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 223 #endif
 224         .get_irq                = mpic_get_irq,
 225         .restart                = fsl_rstcr_restart,
 226         .calibrate_decr         = generic_calibrate_decr,
 227         .progress               = udbg_progress,
 228 };
 229
 230 define_machine(mpc8572_ds) {
 231         .name                   = "MPC8572 DS",
 232         .probe                  = mpc8572_ds_probe,
 233         .setup_arch             = mpc85xx_ds_setup_arch,
 234         .init_IRQ               = mpc85xx_ds_pic_init,
 235 #ifdef CONFIG_PCI
 236         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 237 #endif
 238         .get_irq                = mpic_get_irq,
 239         .restart                = fsl_rstcr_restart,
 240         .calibrate_decr         = generic_calibrate_decr,
 241         .progress               = udbg_progress,
 242 };