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 uses_fsl_uli_m1575;
 119 extern int uli_exclude_device(struct pci_controller *hose,
 120                                 u_char bus, u_char devfn);
 121
 122 static int mpc85xx_exclude_device(struct pci_controller *hose,
 123                                    u_char bus, u_char devfn)
 124 {
 125         struct device_node* node;
 126         struct resource rsrc;
 127
 128         node = hose->dn;
 129         of_address_to_resource(node, 0, &rsrc);
 130
 131         if ((rsrc.start & 0xfffff) == primary_phb_addr) {
 132                 return uli_exclude_device(hose, bus, devfn);
 133         }
 134
 135         return PCIBIOS_SUCCESSFUL;
 136 }
 137 #endif  /* CONFIG_PCI */
 138
 139 /*
 140  * Setup the architecture
 141  */
 142 static void __init mpc85xx_ds_setup_arch(void)
 143 {
 144 #ifdef CONFIG_PCI
 145         struct device_node *np;
 146 #endif
 147
 148         if (ppc_md.progress)
 149                 ppc_md.progress("mpc85xx_ds_setup_arch()", 0);
 150
 151 #ifdef CONFIG_PCI
 152         for_each_node_by_type(np, "pci") {
 153                 if (of_device_is_compatible(np, "fsl,mpc8540-pci") ||
 154                     of_device_is_compatible(np, "fsl,mpc8548-pcie")) {
 155                         struct resource rsrc;
 156                         of_address_to_resource(np, 0, &rsrc);
 157                         if ((rsrc.start & 0xfffff) == primary_phb_addr)
 158                                 fsl_add_bridge(np, 1);
 159                         else
 160                                 fsl_add_bridge(np, 0);
 161                 }
 162         }
 163
 164         uses_fsl_uli_m1575 = 1;
 165         ppc_md.pci_exclude_device = mpc85xx_exclude_device;
 166 #endif
 167
 168         printk("MPC85xx DS board from Freescale Semiconductor\n");
 169 }
 170
 171 /*
 172  * Called very early, device-tree isn't unflattened
 173  */
 174 static int __init mpc8544_ds_probe(void)
 175 {
 176         unsigned long root = of_get_flat_dt_root();
 177
 178         if (of_flat_dt_is_compatible(root, "MPC8544DS")) {
 179 #ifdef CONFIG_PCI
 180                 primary_phb_addr = 0xb000;
 181 #endif
 182                 return 1;
 183         } else {
 184                 return 0;
 185         }
 186 }
 187
 188 static struct of_device_id __initdata mpc85xxds_ids[] = {
 189         { .type = "soc", },
 190         { .compatible = "soc", },
 191         {},
 192 };
 193
 194 static int __init mpc85xxds_publish_devices(void)
 195 {
 196         return of_platform_bus_probe(NULL, mpc85xxds_ids, NULL);
 197 }
 198 machine_device_initcall(mpc8544_ds, mpc85xxds_publish_devices);
 199 machine_device_initcall(mpc8572_ds, mpc85xxds_publish_devices);
 200
 201 /*
 202  * Called very early, device-tree isn't unflattened
 203  */
 204 static int __init mpc8572_ds_probe(void)
 205 {
 206         unsigned long root = of_get_flat_dt_root();
 207
 208         if (of_flat_dt_is_compatible(root, "fsl,MPC8572DS")) {
 209 #ifdef CONFIG_PCI
 210                 primary_phb_addr = 0x8000;
 211 #endif
 212                 return 1;
 213         } else {
 214                 return 0;
 215         }
 216 }
 217
 218 define_machine(mpc8544_ds) {
 219         .name                   = "MPC8544 DS",
 220         .probe                  = mpc8544_ds_probe,
 221         .setup_arch             = mpc85xx_ds_setup_arch,
 222         .init_IRQ               = mpc85xx_ds_pic_init,
 223 #ifdef CONFIG_PCI
 224         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 225 #endif
 226         .get_irq                = mpic_get_irq,
 227         .restart                = fsl_rstcr_restart,
 228         .calibrate_decr         = generic_calibrate_decr,
 229         .progress               = udbg_progress,
 230 };
 231
 232 define_machine(mpc8572_ds) {
 233         .name                   = "MPC8572 DS",
 234         .probe                  = mpc8572_ds_probe,
 235         .setup_arch             = mpc85xx_ds_setup_arch,
 236         .init_IRQ               = mpc85xx_ds_pic_init,
 237 #ifdef CONFIG_PCI
 238         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 239 #endif
 240         .get_irq                = mpic_get_irq,
 241         .restart                = fsl_rstcr_restart,
 242         .calibrate_decr         = generic_calibrate_decr,
 243         .progress               = udbg_progress,
 244 };