text: /*
   * Copyright (C) 2006-2007 PA Semi, Inc
   *
   * Authors: Kip Walker, PA Semi
   *	    Olof Johansson, PA Semi
   *
   * Maintained by: Olof Johansson <olof@lixom.net>
   *
   * Based on arch/powerpc/platforms/maple/setup.c
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
   */
  
  #include <linux/errno.h>
  #include <linux/kernel.h>
  #include <linux/delay.h>
  #include <linux/console.h>
  #include <linux/pci.h>
  
  #include <asm/prom.h>
  #include <asm/system.h>
  #include <asm/iommu.h>
  #include <asm/machdep.h>
  #include <asm/mpic.h>
  #include <asm/smp.h>
  #include <asm/time.h>
  
  #include "pasemi.h"
  
  static void __iomem *reset_reg;
  
  static void pas_restart(char *cmd)
  {
  	printk("Restarting...\n");
  	while (1)
  		out_le32(reset_reg, 0x6000000);
  }
  
  #ifdef CONFIG_SMP
  static DEFINE_SPINLOCK(timebase_lock);
  
  static void __devinit pas_give_timebase(void)
  {
  	unsigned long tb;
  
  	spin_lock(&timebase_lock);
  	mtspr(SPRN_TBCTL, TBCTL_FREEZE);
  	tb = mftb();
  	mtspr(SPRN_TBCTL, TBCTL_UPDATE_LOWER | (tb & 0xffffffff));
  	mtspr(SPRN_TBCTL, TBCTL_UPDATE_UPPER | (tb >> 32));
  	mtspr(SPRN_TBCTL, TBCTL_RESTART);
  	spin_unlock(&timebase_lock);
  	pr_debug("pas_give_timebase: cpu %d gave tb %lx\n",
  		 smp_processor_id(), tb);
  }
  
  static void __devinit pas_take_timebase(void)
  {
  	pr_debug("pas_take_timebase: cpu %d has tb %lx\n",
  		 smp_processor_id(), mftb());
  }
  
  struct smp_ops_t pas_smp_ops = {
  	.probe		= smp_mpic_probe,
  	.message_pass	= smp_mpic_message_pass,
  	.kick_cpu	= smp_generic_kick_cpu,
  	.setup_cpu	= smp_mpic_setup_cpu,
  	.give_timebase	= pas_give_timebase,
  	.take_timebase	= pas_take_timebase,
  };
  #endif /* CONFIG_SMP */
  
  void __init pas_setup_arch(void)
  {
  #ifdef CONFIG_SMP
  	/* Setup SMP callback */
  	smp_ops = &pas_smp_ops;
  #endif
  	/* Lookup PCI hosts */
  	pas_pci_init();
  
  #ifdef CONFIG_DUMMY_CONSOLE
  	conswitchp = &dummy_con;
  #endif
  
  	/* Remap SDC register for doing reset */
  	/* XXXOJN This should maybe come out of the device tree */
  	reset_reg = ioremap(0xfc101100, 4);
  
  	pasemi_idle_init();
  }
  
  /* No legacy IO on our parts */
  static int pas_check_legacy_ioport(unsigned int baseport)
  {
  	return -ENODEV;
  }
  
  static __init void pas_init_IRQ(void)
  {
  	struct device_node *np;
  	struct device_node *root, *mpic_node;
  	unsigned long openpic_addr;
  	const unsigned int *opprop;
  	int naddr, opplen;
  	struct mpic *mpic;
  
  	mpic_node = NULL;
  
  	for_each_node_by_type(np, "interrupt-controller")
  		if (device_is_compatible(np, "open-pic")) {
  			mpic_node = np;
  			break;
  		}
  	if (!mpic_node)
  		for_each_node_by_type(np, "open-pic") {
  			mpic_node = np;
  			break;
  		}
  	if (!mpic_node) {
  		printk(KERN_ERR
  			"Failed to locate the MPIC interrupt controller\n");
  		return;
  	}
  
  	/* Find address list in /platform-open-pic */
  	root = of_find_node_by_path("/");
  	naddr = prom_n_addr_cells(root);
  	opprop = get_property(root, "platform-open-pic", &opplen);
  	if (!opprop) {
  		printk(KERN_ERR "No platform-open-pic property.\n");
  		of_node_put(root);
  		return;
  	}
  	openpic_addr = of_read_number(opprop, naddr);
  	printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
  
  	mpic = mpic_alloc(mpic_node, openpic_addr,
  			  MPIC_PRIMARY|MPIC_LARGE_VECTORS,
  			  0, 0, " PAS-OPIC  ");
  	BUG_ON(!mpic);
  
  	mpic_assign_isu(mpic, 0, openpic_addr + 0x10000);
  	mpic_init(mpic);
  	of_node_put(mpic_node);
  	of_node_put(root);
  }
  
  static void __init pas_progress(char *s, unsigned short hex)
  {
  	printk("[%04x] : %s\n", hex, s ? s : "");
  }
  
  
  static int pas_machine_check_handler(struct pt_regs *regs)
  {
  	int cpu = smp_processor_id();
  	unsigned long srr0, srr1, dsisr;
  
  	srr0 = regs->nip;
  	srr1 = regs->msr;
  	dsisr = mfspr(SPRN_DSISR);
  	printk(KERN_ERR "Machine Check on CPU %d\n", cpu);
  	printk(KERN_ERR "SRR0 0x%016lx SRR1 0x%016lx\n", srr0, srr1);
  	printk(KERN_ERR "DSISR 0x%016lx DAR 0x%016lx\n", dsisr, regs->dar);
  	printk(KERN_ERR "Cause:\n");
  
  	if (srr1 & 0x200000)
  		printk(KERN_ERR "Signalled by SDC\n");
  	if (srr1 & 0x100000) {
  		printk(KERN_ERR "Load/Store detected error:\n");
  		if (dsisr & 0x8000)
  			printk(KERN_ERR "D-cache ECC double-bit error or bus error\n");
  		if (dsisr & 0x4000)
  			printk(KERN_ERR "LSU snoop response error\n");
  		if (dsisr & 0x2000)
  			printk(KERN_ERR "MMU SLB multi-hit or invalid B field\n");
  		if (dsisr & 0x1000)
  			printk(KERN_ERR "Recoverable Duptags\n");
  		if (dsisr & 0x800)
  			printk(KERN_ERR "Recoverable D-cache parity error count overflow\n");
  		if (dsisr & 0x400)
  			printk(KERN_ERR "TLB parity error count overflow\n");
  	}
  	if (srr1 & 0x80000)
  		printk(KERN_ERR "Bus Error\n");
  	if (srr1 & 0x40000)
  		printk(KERN_ERR "I-side SLB multiple hit\n");
  	if (srr1 & 0x20000)
  		printk(KERN_ERR "I-cache parity error hit\n");
  
  	/* SRR1[62] is from MSR[62] if recoverable, so pass that back */
  	return !!(srr1 & 0x2);
  }
  
  static void __init pas_init_early(void)
  {
  	iommu_init_early_pasemi();
  }
  
  
  /*
   * Called very early, MMU is off, device-tree isn't unflattened
   */
  static int __init pas_probe(void)
  {
  	unsigned long root = of_get_flat_dt_root();
  
  	if (!of_flat_dt_is_compatible(root, "PA6T-1682M"))
  		return 0;
  
  	hpte_init_native();
  
  	alloc_iobmap_l2();
  
  	return 1;
  }
  
  define_machine(pas) {
  	.name			= "PA Semi PA6T-1682M",
  	.probe			= pas_probe,
  	.setup_arch		= pas_setup_arch,
  	.init_early		= pas_init_early,
  	.init_IRQ		= pas_init_IRQ,
  	.get_irq		= mpic_get_irq,
  	.restart		= pas_restart,
  	.get_boot_time		= pas_get_boot_time,
  	.calibrate_decr		= generic_calibrate_decr,
  	.check_legacy_ioport    = pas_check_legacy_ioport,
  	.progress		= pas_progress,
  	.machine_check_exception = pas_machine_check_handler,
  	.pci_irq_fixup		= pas_pci_irq_fixup,
  };
  