text: /*
   *  Maple (970 eval board) setup code
   *
   *  (c) Copyright 2004 Benjamin Herrenschmidt (benh@kernel.crashing.org),
   *                     IBM Corp. 
   *
   *  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.
   *
   */
  
  #undef DEBUG
  
  #include <linux/init.h>
  #include <linux/errno.h>
  #include <linux/sched.h>
  #include <linux/kernel.h>
  #include <linux/mm.h>
  #include <linux/stddef.h>
  #include <linux/unistd.h>
  #include <linux/ptrace.h>
  #include <linux/slab.h>
  #include <linux/user.h>
  #include <linux/a.out.h>
  #include <linux/tty.h>
  #include <linux/string.h>
  #include <linux/delay.h>
  #include <linux/ioport.h>
  #include <linux/major.h>
  #include <linux/initrd.h>
  #include <linux/vt_kern.h>
  #include <linux/console.h>
  #include <linux/pci.h>
  #include <linux/adb.h>
  #include <linux/cuda.h>
  #include <linux/pmu.h>
  #include <linux/irq.h>
  #include <linux/seq_file.h>
  #include <linux/root_dev.h>
  #include <linux/serial.h>
  #include <linux/smp.h>
  
  #include <asm/processor.h>
  #include <asm/sections.h>
  #include <asm/prom.h>
  #include <asm/system.h>
  #include <asm/pgtable.h>
  #include <asm/bitops.h>
  #include <asm/io.h>
  #include <asm/kexec.h>
  #include <asm/pci-bridge.h>
  #include <asm/iommu.h>
  #include <asm/machdep.h>
  #include <asm/dma.h>
  #include <asm/cputable.h>
  #include <asm/time.h>
  #include <asm/of_device.h>
  #include <asm/lmb.h>
  #include <asm/mpic.h>
  #include <asm/rtas.h>
  #include <asm/udbg.h>
  #include <asm/nvram.h>
  
  #include "maple.h"
  
  #ifdef DEBUG
  #define DBG(fmt...) udbg_printf(fmt)
  #else
  #define DBG(fmt...)
  #endif
  
  static unsigned long maple_find_nvram_base(void)
  {
  	struct device_node *rtcs;
  	unsigned long result = 0;
  
  	/* find NVRAM device */
  	rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111");
  	if (rtcs) {
  		struct resource r;
  		if (of_address_to_resource(rtcs, 0, &r)) {
  			printk(KERN_EMERG "Maple: Unable to translate NVRAM"
  			       " address\n");
  			goto bail;
  		}
  		if (!(r.flags & IORESOURCE_IO)) {
  			printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n");
  			goto bail;
  		}
  		result = r.start;
  	} else
  		printk(KERN_EMERG "Maple: Unable to find NVRAM\n");
   bail:
  	of_node_put(rtcs);
  	return result;
  }
  
  static void maple_restart(char *cmd)
  {
  	unsigned int maple_nvram_base;
  	const unsigned int *maple_nvram_offset, *maple_nvram_command;
  	struct device_node *sp;
  
  	maple_nvram_base = maple_find_nvram_base();
  	if (maple_nvram_base == 0)
  		goto fail;
  
  	/* find service processor device */
  	sp = of_find_node_by_name(NULL, "service-processor");
  	if (!sp) {
  		printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
  		goto fail;
  	}
  	maple_nvram_offset = of_get_property(sp, "restart-addr", NULL);
  	maple_nvram_command = of_get_property(sp, "restart-value", NULL);
  	of_node_put(sp);
  
  	/* send command */
  	outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
  	for (;;) ;
   fail:
  	printk(KERN_EMERG "Maple: Manual Restart Required\n");
  }
  
  static void maple_power_off(void)
  {
  	unsigned int maple_nvram_base;
  	const unsigned int *maple_nvram_offset, *maple_nvram_command;
  	struct device_node *sp;
  
  	maple_nvram_base = maple_find_nvram_base();
  	if (maple_nvram_base == 0)
  		goto fail;
  
  	/* find service processor device */
  	sp = of_find_node_by_name(NULL, "service-processor");
  	if (!sp) {
  		printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
  		goto fail;
  	}
  	maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL);
  	maple_nvram_command = of_get_property(sp, "power-off-value", NULL);
  	of_node_put(sp);
  
  	/* send command */
  	outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
  	for (;;) ;
   fail:
  	printk(KERN_EMERG "Maple: Manual Power-Down Required\n");
  }
  
  static void maple_halt(void)
  {
  	maple_power_off();
  }
  
  #ifdef CONFIG_SMP
  struct smp_ops_t maple_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	= smp_generic_give_timebase,
  	.take_timebase	= smp_generic_take_timebase,
  };
  #endif /* CONFIG_SMP */
  
  static void __init maple_use_rtas_reboot_and_halt_if_present(void)
  {
  	if (rtas_service_present("system-reboot") &&
  	    rtas_service_present("power-off")) {
  		ppc_md.restart = rtas_restart;
  		ppc_md.power_off = rtas_power_off;
  		ppc_md.halt = rtas_halt;
  	}
  }
  
  void __init maple_setup_arch(void)
  {
  	/* init to some ~sane value until calibrate_delay() runs */
  	loops_per_jiffy = 50000000;
  
  	/* Setup SMP callback */
  #ifdef CONFIG_SMP
  	smp_ops = &maple_smp_ops;
  #endif
  	/* Lookup PCI hosts */
         	maple_pci_init();
  
  #ifdef CONFIG_DUMMY_CONSOLE
  	conswitchp = &dummy_con;
  #endif
  	maple_use_rtas_reboot_and_halt_if_present();
  
  	printk(KERN_DEBUG "Using native/NAP idle loop\n");
  
  	mmio_nvram_init();
  }
  
  /* 
   * Early initialization.
   */
  static void __init maple_init_early(void)
  {
  	DBG(" -> maple_init_early\n");
  
  	iommu_init_early_dart();
  
  	DBG(" <- maple_init_early\n");
  }
  
  /*
   * This is almost identical to pSeries and CHRP. We need to make that
   * code generic at one point, with appropriate bits in the device-tree to
   * identify the presence of an HT APIC
   */
  static void __init maple_init_IRQ(void)
  {
  	struct device_node *root, *np, *mpic_node = NULL;
  	const unsigned int *opprop;
  	unsigned long openpic_addr = 0;
  	int naddr, n, i, opplen, has_isus = 0;
  	struct mpic *mpic;
  	unsigned int flags = MPIC_PRIMARY;
  
  	/* Locate MPIC in the device-tree. Note that there is a bug
  	 * in Maple device-tree where the type of the controller is
  	 * open-pic and not interrupt-controller
  	 */
  
  	for_each_node_by_type(np, "interrupt-controller")
  		if (of_device_is_compatible(np, "open-pic")) {
  			mpic_node = np;
  			break;
  		}
  	if (mpic_node == NULL)
  		for_each_node_by_type(np, "open-pic") {
  			mpic_node = np;
  			break;
  		}
  	if (mpic_node == NULL) {
  		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 = of_n_addr_cells(root);
  	opprop = of_get_property(root, "platform-open-pic", &opplen);
  	if (opprop != 0) {
  		openpic_addr = of_read_number(opprop, naddr);
  		has_isus = (opplen > naddr);
  		printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n",
  		       openpic_addr, has_isus);
  	}
  
  	BUG_ON(openpic_addr == 0);
  
  	/* Check for a big endian MPIC */
  	if (of_get_property(np, "big-endian", NULL) != NULL)
  		flags |= MPIC_BIG_ENDIAN;
  
  	/* XXX Maple specific bits */
  	flags |= MPIC_U3_HT_IRQS | MPIC_WANTS_RESET;
  	/* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */
  	flags |= MPIC_BIG_ENDIAN;
  
  	/* Setup the openpic driver. More device-tree junks, we hard code no
  	 * ISUs for now. I'll have to revisit some stuffs with the folks doing
  	 * the firmware for those
  	 */
  	mpic = mpic_alloc(mpic_node, openpic_addr, flags,
  			  /*has_isus ? 16 :*/ 0, 0, " MPIC     ");
  	BUG_ON(mpic == NULL);
  
  	/* Add ISUs */
  	opplen /= sizeof(u32);
  	for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
  		unsigned long isuaddr = of_read_number(opprop + i, naddr);
  		mpic_assign_isu(mpic, n, isuaddr);
  	}
  
  	/* All ISUs are setup, complete initialization */
  	mpic_init(mpic);
  	ppc_md.get_irq = mpic_get_irq;
  	of_node_put(mpic_node);
  	of_node_put(root);
  }
  
  static void __init maple_progress(char *s, unsigned short hex)
  {
  	printk("*** %04x : %s\n", hex, s ? s : "");
  }
  
  
  /*
   * Called very early, MMU is off, device-tree isn't unflattened
   */
  static int __init maple_probe(void)
  {
  	unsigned long root = of_get_flat_dt_root();
  
  	if (!of_flat_dt_is_compatible(root, "Momentum,Maple") &&
  	    !of_flat_dt_is_compatible(root, "Momentum,Apache"))
  		return 0;
  	/*
  	 * On U3, the DART (iommu) must be allocated now since it
  	 * has an impact on htab_initialize (due to the large page it
  	 * occupies having to be broken up so the DART itself is not
  	 * part of the cacheable linar mapping
  	 */
  	alloc_dart_table();
  
  	hpte_init_native();
  
  	return 1;
  }
  
  define_machine(maple_md) {
  	.name			= "Maple",
  	.probe			= maple_probe,
  	.setup_arch		= maple_setup_arch,
  	.init_early		= maple_init_early,
  	.init_IRQ		= maple_init_IRQ,
  	.pci_irq_fixup		= maple_pci_irq_fixup,
  	.pci_get_legacy_ide_irq	= maple_pci_get_legacy_ide_irq,
  	.restart		= maple_restart,
  	.power_off		= maple_power_off,
  	.halt			= maple_halt,
         	.get_boot_time		= maple_get_boot_time,
         	.set_rtc_time		= maple_set_rtc_time,
         	.get_rtc_time		= maple_get_rtc_time,
        	.calibrate_decr		= generic_calibrate_decr,
  	.progress		= maple_progress,
  	.power_save		= power4_idle,
  #ifdef CONFIG_KEXEC
  	.machine_kexec		= default_machine_kexec,
  	.machine_kexec_prepare	= default_machine_kexec_prepare,
  	.machine_crash_shutdown	= default_machine_crash_shutdown,
  #endif
  };
  