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/extable.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/time.h>
  36 #include <asm/machdep.h>
  37 #include <asm/prom.h>
  38 #include <asm/udbg.h>
  39 #include <asm/tsi108.h>
  40 #include <asm/pci-bridge.h>
  41 #include <asm/reg.h>
  42 #include <mm/mmu_decl.h>
  43 #include <asm/tsi108_pci.h>
  44 #include <asm/tsi108_irq.h>
  45 #include <asm/mpic.h>
  46
  47 #undef DEBUG
  48 #ifdef DEBUG
  49 #define DBG(fmt...) do { printk(fmt); } while(0)
  50 #else
  51 #define DBG(fmt...) do { } while(0)
  52 #endif
  53
  54 #define MPC7448HPC2_PCI_CFG_PHYS 0xfb000000
  55
  56 int mpc7448_hpc2_exclude_device(struct pci_controller *hose,
  57                                 u_char bus, u_char devfn)
  58 {
  59         if (bus == 0 && PCI_SLOT(devfn) == 0)
  60                 return PCIBIOS_DEVICE_NOT_FOUND;
  61         else
  62                 return PCIBIOS_SUCCESSFUL;
  63 }
  64
  65 static void __init mpc7448_hpc2_setup_arch(void)
  66 {
  67         struct device_node *np;
  68         if (ppc_md.progress)
  69                 ppc_md.progress("mpc7448_hpc2_setup_arch():set_bridge", 0);
  70
  71         tsi108_csr_vir_base = get_vir_csrbase();
  72
  73         /* setup PCI host bridge */
  74 #ifdef CONFIG_PCI
  75         for_each_compatible_node(np, "pci", "tsi108-pci")
  76                 tsi108_setup_pci(np, MPC7448HPC2_PCI_CFG_PHYS, 0);
  77
  78         ppc_md.pci_exclude_device = mpc7448_hpc2_exclude_device;
  79         if (ppc_md.progress)
  80                 ppc_md.progress("tsi108: resources set", 0x100);
  81 #endif
  82
  83         printk(KERN_INFO "MPC7448HPC2 (TAIGA) Platform\n");
  84         printk(KERN_INFO
  85                "Jointly ported by Freescale and Tundra Semiconductor\n");
  86         printk(KERN_INFO
  87                "Enabling L2 cache then enabling the HID0 prefetch engine.\n");
  88 }
  89
  90 /*
  91  * Interrupt setup and service.  Interrupts on the mpc7448_hpc2 come
  92  * from the four external INT pins, PCI interrupts are routed via
  93  * PCI interrupt control registers, it generates internal IRQ23
  94  *
  95  * Interrupt routing on the Taiga Board:
  96  * TSI108:PB_INT[0] -> CPU0:INT#
  97  * TSI108:PB_INT[1] -> CPU0:MCP#
  98  * TSI108:PB_INT[2] -> N/C
  99  * TSI108:PB_INT[3] -> N/C
 100  */
 101 static void __init mpc7448_hpc2_init_IRQ(void)
 102 {
 103         struct mpic *mpic;
 104 #ifdef CONFIG_PCI
 105         unsigned int cascade_pci_irq;
 106         struct device_node *tsi_pci;
 107         struct device_node *cascade_node = NULL;
 108 #endif
 109
 110         mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
 111                         MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
 112                         24, 0,
 113                         "Tsi108_PIC");
 114
 115         BUG_ON(mpic == NULL);
 116
 117         mpic_assign_isu(mpic, 0, mpic->paddr + 0x100);
 118
 119         mpic_init(mpic);
 120
 121 #ifdef CONFIG_PCI
 122         tsi_pci = of_find_node_by_type(NULL, "pci");
 123         if (tsi_pci == NULL) {
 124                 printk("%s: No tsi108 pci node found !\n", __func__);
 125                 return;
 126         }
 127         cascade_node = of_find_node_by_type(NULL, "pic-router");
 128         if (cascade_node == NULL) {
 129                 printk("%s: No tsi108 pci cascade node found !\n", __func__);
 130                 return;
 131         }
 132
 133         cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
 134         DBG("%s: tsi108 cascade_pci_irq = 0x%x\n", __func__,
 135             (u32) cascade_pci_irq);
 136         tsi108_pci_int_init(cascade_node);
 137         irq_set_handler_data(cascade_pci_irq, mpic);
 138         irq_set_chained_handler(cascade_pci_irq, tsi108_irq_cascade);
 139 #endif
 140         /* Configure MPIC outputs to CPU0 */
 141         tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
 142 }
 143
 144 void mpc7448_hpc2_show_cpuinfo(struct seq_file *m)
 145 {
 146         seq_printf(m, "vendor\t\t: Freescale Semiconductor\n");
 147 }
 148
 149 static void __noreturn mpc7448_hpc2_restart(char *cmd)
 150 {
 151         local_irq_disable();
 152
 153         /* Set exception prefix high - to the firmware */
 154         _nmask_and_or_msr(0, MSR_IP);
 155
 156         for (;;) ;              /* Spin until reset happens */
 157 }
 158
 159 /*
 160  * Called very early, device-tree isn't unflattened
 161  */
 162 static int __init mpc7448_hpc2_probe(void)
 163 {
 164         if (!of_machine_is_compatible("mpc74xx"))
 165                 return 0;
 166         return 1;
 167 }
 168
 169 static int mpc7448_machine_check_exception(struct pt_regs *regs)
 170 {
 171         const struct exception_table_entry *entry;
 172
 173         /* Are we prepared to handle this fault */
 174         if ((entry = search_exception_tables(regs->nip)) != NULL) {
 175                 tsi108_clear_pci_cfg_error();
 176                 regs->msr |= MSR_RI;
 177                 regs->nip = extable_fixup(entry);
 178                 return 1;
 179         }
 180         return 0;
 181 }
 182
 183 define_machine(mpc7448_hpc2){
 184         .name                   = "MPC7448 HPC2",
 185         .probe                  = mpc7448_hpc2_probe,
 186         .setup_arch             = mpc7448_hpc2_setup_arch,
 187         .init_IRQ               = mpc7448_hpc2_init_IRQ,
 188         .show_cpuinfo           = mpc7448_hpc2_show_cpuinfo,
 189         .get_irq                = mpic_get_irq,
 190         .restart                = mpc7448_hpc2_restart,
 191         .calibrate_decr         = generic_calibrate_decr,
 192         .machine_check_exception= mpc7448_machine_check_exception,
 193         .progress               = udbg_progress,
 194 };