arch/powerpc/platforms/embedded6xx/mpc7448_hpc2.c

   1 /*
   2  * mpc7448_hpc2.c
   3  *
   4  * Board setup routines for the Freescale mpc7448hpc2(taiga) platform
   5  *
   6  * Author: Jacob Pan
   7  *       jacob.pan@freescale.com
   8  * Author: Xianghua Xiao
   9  *       x.xiao@freescale.com
  10  * Maintainer: Roy Zang <tie-fei.zang@freescale.com>
  11  *      Add Flat Device Tree support fot mpc7448hpc2 board
  12  *
  13  * Copyright 2004-2006 Freescale Semiconductor, Inc.
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License
  17  * as published by the Free Software Foundation; either version
  18  * 2 of the License, or (at your option) any later version.
  19  */
  20
  21 #include <linux/stddef.h>
  22 #include <linux/kernel.h>
  23 #include <linux/pci.h>
  24 #include <linux/kdev_t.h>
  25 #include <linux/console.h>
  26 #include <linux/module.h>
  27 #include <linux/delay.h>
  28 #include <linux/irq.h>
  29 #include <linux/seq_file.h>
  30 #include <linux/root_dev.h>
  31 #include <linux/serial.h>
  32 #include <linux/tty.h>
  33 #include <linux/serial_core.h>
  34
  35 #include <asm/system.h>
  36 #include <asm/time.h>
  37 #include <asm/machdep.h>
  38 #include <asm/prom.h>
  39 #include <asm/udbg.h>
  40 #include <asm/tsi108.h>
  41 #include <asm/pci-bridge.h>
  42 #include <asm/reg.h>
  43 #include <mm/mmu_decl.h>
  44 #include <asm/tsi108_pci.h>
  45 #include <asm/tsi108_irq.h>
  46 #include <asm/mpic.h>
  47
  48 #undef DEBUG
  49 #ifdef DEBUG
  50 #define DBG(fmt...) do { printk(fmt); } while(0)
  51 #else
  52 #define DBG(fmt...) do { } while(0)
  53 #endif
  54
  55 #define MPC7448HPC2_PCI_CFG_PHYS 0xfb000000
  56
  57 int mpc7448_hpc2_exclude_device(struct pci_controller *hose,
  58                                 u_char bus, u_char devfn)
  59 {
  60         if (bus == 0 && PCI_SLOT(devfn) == 0)
  61                 return PCIBIOS_DEVICE_NOT_FOUND;
  62         else
  63                 return PCIBIOS_SUCCESSFUL;
  64 }
  65
  66 static void __init mpc7448_hpc2_setup_arch(void)
  67 {
  68         struct device_node *np;
  69         if (ppc_md.progress)
  70                 ppc_md.progress("mpc7448_hpc2_setup_arch():set_bridge", 0);
  71
  72         tsi108_csr_vir_base = get_vir_csrbase();
  73
  74         /* setup PCI host bridge */
  75 #ifdef CONFIG_PCI
  76         for_each_compatible_node(np, "pci", "tsi108-pci")
  77                 tsi108_setup_pci(np, MPC7448HPC2_PCI_CFG_PHYS, 0);
  78
  79         ppc_md.pci_exclude_device = mpc7448_hpc2_exclude_device;
  80         if (ppc_md.progress)
  81                 ppc_md.progress("tsi108: resources set", 0x100);
  82 #endif
  83
  84         printk(KERN_INFO "MPC7448HPC2 (TAIGA) Platform\n");
  85         printk(KERN_INFO
  86                "Jointly ported by Freescale and Tundra Semiconductor\n");
  87         printk(KERN_INFO
  88                "Enabling L2 cache then enabling the HID0 prefetch engine.\n");
  89 }
  90
  91 /*
  92  * Interrupt setup and service.  Interrupts on the mpc7448_hpc2 come
  93  * from the four external INT pins, PCI interrupts are routed via
  94  * PCI interrupt control registers, it generates internal IRQ23
  95  *
  96  * Interrupt routing on the Taiga Board:
  97  * TSI108:PB_INT[0] -> CPU0:INT#
  98  * TSI108:PB_INT[1] -> CPU0:MCP#
  99  * TSI108:PB_INT[2] -> N/C
 100  * TSI108:PB_INT[3] -> N/C
 101  */
 102 static void __init mpc7448_hpc2_init_IRQ(void)
 103 {
 104         struct mpic *mpic;
 105 #ifdef CONFIG_PCI
 106         unsigned int cascade_pci_irq;
 107         struct device_node *tsi_pci;
 108         struct device_node *cascade_node = NULL;
 109 #endif
 110
 111         mpic = mpic_alloc(NULL, 0,
 112                         MPIC_BIG_ENDIAN | MPIC_WANTS_RESET |
 113                         MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
 114                         24,
 115                         NR_IRQS-4, /* num_sources used */
 116                         "Tsi108_PIC");
 117
 118         BUG_ON(mpic == NULL);
 119
 120         mpic_assign_isu(mpic, 0, mpic->paddr + 0x100);
 121
 122         mpic_init(mpic);
 123
 124 #ifdef CONFIG_PCI
 125         tsi_pci = of_find_node_by_type(NULL, "pci");
 126         if (tsi_pci == NULL) {
 127                 printk("%s: No tsi108 pci node found !\n", __func__);
 128                 return;
 129         }
 130         cascade_node = of_find_node_by_type(NULL, "pic-router");
 131         if (cascade_node == NULL) {
 132                 printk("%s: No tsi108 pci cascade node found !\n", __func__);
 133                 return;
 134         }
 135
 136         cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
 137         DBG("%s: tsi108 cascade_pci_irq = 0x%x\n", __func__,
 138             (u32) cascade_pci_irq);
 139         tsi108_pci_int_init(cascade_node);
 140         irq_set_handler_data(cascade_pci_irq, mpic);
 141         irq_set_chained_handler(cascade_pci_irq, tsi108_irq_cascade);
 142 #endif
 143         /* Configure MPIC outputs to CPU0 */
 144         tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
 145 }
 146
 147 void mpc7448_hpc2_show_cpuinfo(struct seq_file *m)
 148 {
 149         seq_printf(m, "vendor\t\t: Freescale Semiconductor\n");
 150 }
 151
 152 void mpc7448_hpc2_restart(char *cmd)
 153 {
 154         local_irq_disable();
 155
 156         /* Set exception prefix high - to the firmware */
 157         _nmask_and_or_msr(0, MSR_IP);
 158
 159         for (;;) ;              /* Spin until reset happens */
 160 }
 161
 162 void mpc7448_hpc2_power_off(void)
 163 {
 164         local_irq_disable();
 165         for (;;) ;              /* No way to shut power off with software */
 166 }
 167
 168 void mpc7448_hpc2_halt(void)
 169 {
 170         mpc7448_hpc2_power_off();
 171 }
 172
 173 /*
 174  * Called very early, device-tree isn't unflattened
 175  */
 176 static int __init mpc7448_hpc2_probe(void)
 177 {
 178         unsigned long root = of_get_flat_dt_root();
 179
 180         if (!of_flat_dt_is_compatible(root, "mpc74xx"))
 181                 return 0;
 182         return 1;
 183 }
 184
 185 static int mpc7448_machine_check_exception(struct pt_regs *regs)
 186 {
 187         const struct exception_table_entry *entry;
 188
 189         /* Are we prepared to handle this fault */
 190         if ((entry = search_exception_tables(regs->nip)) != NULL) {
 191                 tsi108_clear_pci_cfg_error();
 192                 regs->msr |= MSR_RI;
 193                 regs->nip = entry->fixup;
 194                 return 1;
 195         }
 196         return 0;
 197 }
 198
 199 define_machine(mpc7448_hpc2){
 200         .name                   = "MPC7448 HPC2",
 201         .probe                  = mpc7448_hpc2_probe,
 202         .setup_arch             = mpc7448_hpc2_setup_arch,
 203         .init_IRQ               = mpc7448_hpc2_init_IRQ,
 204         .show_cpuinfo           = mpc7448_hpc2_show_cpuinfo,
 205         .get_irq                = mpic_get_irq,
 206         .restart                = mpc7448_hpc2_restart,
 207         .calibrate_decr         = generic_calibrate_decr,
 208         .machine_check_exception= mpc7448_machine_check_exception,
 209         .progress               = udbg_progress,
 210 };