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mpc7448_hpc2.c

/*
 * mpc7448_hpc2.c
 *
 * Board setup routines for the Freescale mpc7448hpc2(taiga) platform
 *
 * Author: Jacob Pan
 *     jacob.pan@freescale.com
 * Author: Xianghua Xiao
 *       x.xiao@freescale.com
 * Maintainer: Roy Zang <tie-fei.zang@freescale.com>
 *    Add Flat Device Tree support fot mpc7448hpc2 board
 *
 * Copyright 2004-2006 Freescale Semiconductor, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/kdev_t.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/serial.h>
#include <linux/tty.h>
#include <linux/serial_core.h>

#include <asm/system.h>
#include <asm/time.h>
#include <asm/machdep.h>
#include <asm/prom.h>
#include <asm/udbg.h>
#include <asm/tsi108.h>
#include <asm/pci-bridge.h>
#include <asm/reg.h>
#include <mm/mmu_decl.h>
#include <asm/tsi108_pci.h>
#include <asm/tsi108_irq.h>
#include <asm/mpic.h>

#undef DEBUG
#ifdef DEBUG
#define DBG(fmt...) do { printk(fmt); } while(0)
#else
#define DBG(fmt...) do { } while(0)
#endif

#define MPC7448HPC2_PCI_CFG_PHYS 0xfb000000

int mpc7448_hpc2_exclude_device(struct pci_controller *hose,
                        u_char bus, u_char devfn)
{
      if (bus == 0 && PCI_SLOT(devfn) == 0)
            return PCIBIOS_DEVICE_NOT_FOUND;
      else
            return PCIBIOS_SUCCESSFUL;
}

static void __init mpc7448_hpc2_setup_arch(void)
{
      struct device_node *np;
      if (ppc_md.progress)
            ppc_md.progress("mpc7448_hpc2_setup_arch():set_bridge", 0);

      tsi108_csr_vir_base = get_vir_csrbase();

      /* setup PCI host bridge */
#ifdef CONFIG_PCI
      for_each_compatible_node(np, "pci", "tsi108-pci")
            tsi108_setup_pci(np, MPC7448HPC2_PCI_CFG_PHYS, 0);

      ppc_md.pci_exclude_device = mpc7448_hpc2_exclude_device;
      if (ppc_md.progress)
            ppc_md.progress("tsi108: resources set", 0x100);
#endif

      printk(KERN_INFO "MPC7448HPC2 (TAIGA) Platform\n");
      printk(KERN_INFO
             "Jointly ported by Freescale and Tundra Semiconductor\n");
      printk(KERN_INFO
             "Enabling L2 cache then enabling the HID0 prefetch engine.\n");
}

/*
 * Interrupt setup and service.  Interrupts on the mpc7448_hpc2 come
 * from the four external INT pins, PCI interrupts are routed via
 * PCI interrupt control registers, it generates internal IRQ23
 *
 * Interrupt routing on the Taiga Board:
 * TSI108:PB_INT[0] -> CPU0:INT#
 * TSI108:PB_INT[1] -> CPU0:MCP#
 * TSI108:PB_INT[2] -> N/C
 * TSI108:PB_INT[3] -> N/C
 */
static void __init mpc7448_hpc2_init_IRQ(void)
{
      struct mpic *mpic;
      phys_addr_t mpic_paddr = 0;
      struct device_node *tsi_pic;
#ifdef CONFIG_PCI
      unsigned int cascade_pci_irq;
      struct device_node *tsi_pci;
      struct device_node *cascade_node = NULL;
#endif

      tsi_pic = of_find_node_by_type(NULL, "open-pic");
      if (tsi_pic) {
            unsigned int size;
            const void *prop = of_get_property(tsi_pic, "reg", &size);
            mpic_paddr = of_translate_address(tsi_pic, prop);
      }

      if (mpic_paddr == 0) {
            printk("%s: No tsi108 PIC found !\n", __func__);
            return;
      }

      DBG("%s: tsi108 pic phys_addr = 0x%x\n", __func__,
          (u32) mpic_paddr);

      mpic = mpic_alloc(tsi_pic, mpic_paddr,
                  MPIC_PRIMARY | MPIC_BIG_ENDIAN | MPIC_WANTS_RESET |
                  MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
                  24,
                  NR_IRQS-4, /* num_sources used */
                  "Tsi108_PIC");

      BUG_ON(mpic == NULL);

      mpic_assign_isu(mpic, 0, mpic_paddr + 0x100);

      mpic_init(mpic);

#ifdef CONFIG_PCI
      tsi_pci = of_find_node_by_type(NULL, "pci");
      if (tsi_pci == NULL) {
            printk("%s: No tsi108 pci node found !\n", __func__);
            return;
      }
      cascade_node = of_find_node_by_type(NULL, "pic-router");
      if (cascade_node == NULL) {
            printk("%s: No tsi108 pci cascade node found !\n", __func__);
            return;
      }

      cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
      DBG("%s: tsi108 cascade_pci_irq = 0x%x\n", __func__,
          (u32) cascade_pci_irq);
      tsi108_pci_int_init(cascade_node);
      set_irq_data(cascade_pci_irq, mpic);
      set_irq_chained_handler(cascade_pci_irq, tsi108_irq_cascade);
#endif
      /* Configure MPIC outputs to CPU0 */
      tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
      of_node_put(tsi_pic);
}

void mpc7448_hpc2_show_cpuinfo(struct seq_file *m)
{
      seq_printf(m, "vendor\t\t: Freescale Semiconductor\n");
      seq_printf(m, "machine\t\t: MPC7448hpc2\n");
}

void mpc7448_hpc2_restart(char *cmd)
{
      local_irq_disable();

      /* Set exception prefix high - to the firmware */
      _nmask_and_or_msr(0, MSR_IP);

      for (;;) ;        /* Spin until reset happens */
}

void mpc7448_hpc2_power_off(void)
{
      local_irq_disable();
      for (;;) ;        /* No way to shut power off with software */
}

void mpc7448_hpc2_halt(void)
{
      mpc7448_hpc2_power_off();
}

/*
 * Called very early, device-tree isn't unflattened
 */
static int __init mpc7448_hpc2_probe(void)
{
      unsigned long root = of_get_flat_dt_root();

      if (!of_flat_dt_is_compatible(root, "mpc74xx"))
            return 0;
      return 1;
}

static int mpc7448_machine_check_exception(struct pt_regs *regs)
{
      const struct exception_table_entry *entry;

      /* Are we prepared to handle this fault */
      if ((entry = search_exception_tables(regs->nip)) != NULL) {
            tsi108_clear_pci_cfg_error();
            regs->msr |= MSR_RI;
            regs->nip = entry->fixup;
            return 1;
      }
      return 0;
}

define_machine(mpc7448_hpc2){
      .name                   = "MPC7448 HPC2",
      .probe                  = mpc7448_hpc2_probe,
      .setup_arch             = mpc7448_hpc2_setup_arch,
      .init_IRQ         = mpc7448_hpc2_init_IRQ,
      .show_cpuinfo           = mpc7448_hpc2_show_cpuinfo,
      .get_irq          = mpic_get_irq,
      .restart          = mpc7448_hpc2_restart,
      .calibrate_decr   = generic_calibrate_decr,
      .machine_check_exception= mpc7448_machine_check_exception,
      .progress         = udbg_progress,
};

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