/*
   * This file is subject to the terms and conditions of the GNU General
   * Public License.  See the file "COPYING" in the main directory of this
   * archive for more details.
   *
   * Copyright (C) 2000 - 2001 by Kanoj Sarcar (kanoj@sgi.com)
   * Copyright (C) 2000 - 2001 by Silicon Graphics, Inc.
   */

  #include <linux/kernel.h>
  #include <linux/init.h>
  #include <linux/sched.h>

  #include <linux/smp.h>

  #include <linux/mm.h>
  #include <linux/module.h>
  #include <linux/cpumask.h>
  #include <asm/cpu.h>
  #include <asm/io.h>
  #include <asm/pgtable.h>
  #include <asm/time.h>
  #include <asm/sn/types.h>
  #include <asm/sn/sn0/addrs.h>
  #include <asm/sn/sn0/hubni.h>
  #include <asm/sn/sn0/hubio.h>
  #include <asm/sn/klconfig.h>
  #include <asm/sn/ioc3.h>
  #include <asm/mipsregs.h>
  #include <asm/sn/gda.h>
  #include <asm/sn/hub.h>
  #include <asm/sn/intr.h>
  #include <asm/current.h>

  #include <asm/processor.h>
  #include <asm/mmu_context.h>
  #include <asm/thread_info.h>
  #include <asm/sn/launch.h>
  #include <asm/sn/sn_private.h>
  #include <asm/sn/sn0/ip27.h>
  #include <asm/sn/mapped_kernel.h>
  
  #define CPU_NONE		(cpuid_t)-1
  
  static DECLARE_BITMAP(hub_init_mask, MAX_COMPACT_NODES);
  nasid_t master_nasid = INVALID_NASID;
  
  cnodeid_t	nasid_to_compact_node[MAX_NASIDS];
  nasid_t		compact_to_nasid_node[MAX_COMPACT_NODES];
  cnodeid_t	cpuid_to_compact_node[MAXCPUS];
  
  EXPORT_SYMBOL(nasid_to_compact_node);

  struct cpuinfo_ip27 sn_cpu_info[NR_CPUS];
  EXPORT_SYMBOL_GPL(sn_cpu_info);

  extern void pcibr_setup(cnodeid_t);
  
  extern void xtalk_probe_node(cnodeid_t nid);

  static void __cpuinit per_hub_init(cnodeid_t cnode)

  {
  	struct hub_data *hub = hub_data(cnode);
  	nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);

  	int i;

  
  	cpu_set(smp_processor_id(), hub->h_cpus);
  
  	if (test_and_set_bit(cnode, hub_init_mask))
  		return;

  	/*
  	 * Set CRB timeout at 5ms, (< PI timeout of 10ms)
  	 */
  	REMOTE_HUB_S(nasid, IIO_ICTP, 0x800);
  	REMOTE_HUB_S(nasid, IIO_ICTO, 0xff);
  
  	hub_rtc_init(cnode);
  	xtalk_probe_node(cnode);
  
  #ifdef CONFIG_REPLICATE_EXHANDLERS
  	/*
  	 * If this is not a headless node initialization,
  	 * copy over the caliased exception handlers.
  	 */
  	if (get_compact_nodeid() == cnode) {
  		extern char except_vec2_generic, except_vec3_generic;
  		extern void build_tlb_refill_handler(void);
  
  		memcpy((void *)(CKSEG0 + 0x100), &except_vec2_generic, 0x80);
  		memcpy((void *)(CKSEG0 + 0x180), &except_vec3_generic, 0x80);
  		build_tlb_refill_handler();
  		memcpy((void *)(CKSEG0 + 0x100), (void *) CKSEG0, 0x80);
  		memcpy((void *)(CKSEG0 + 0x180), &except_vec3_generic, 0x100);
  		__flush_cache_all();
  	}
  #endif

  
  	/*
  	 * Some interrupts are reserved by hardware or by software convention.

  	 * Mark these as reserved right away so they won't be used accidentally

  	 * later.
  	 */
  	for (i = 0; i <= BASE_PCI_IRQ; i++) {
  		__set_bit(i, hub->irq_alloc_mask);
  		LOCAL_HUB_CLR_INTR(INT_PEND0_BASELVL + i);
  	}
  
  	__set_bit(IP_PEND0_6_63, hub->irq_alloc_mask);
  	LOCAL_HUB_S(PI_INT_PEND_MOD, IP_PEND0_6_63);
  
  	for (i = NI_BRDCAST_ERR_A; i <= MSC_PANIC_INTR; i++) {
  		__set_bit(i, hub->irq_alloc_mask);
  		LOCAL_HUB_CLR_INTR(INT_PEND1_BASELVL + i);
  	}

  }

  void __cpuinit per_cpu_init(void)

  {
  	int cpu = smp_processor_id();
  	int slice = LOCAL_HUB_L(PI_CPU_NUM);
  	cnodeid_t cnode = get_compact_nodeid();
  	struct hub_data *hub = hub_data(cnode);
  	struct slice_data *si = hub->slice + slice;
  	int i;
  
  	if (test_and_set_bit(slice, &hub->slice_map))
  		return;
  
  	clear_c0_status(ST0_IM);

  	per_hub_init(cnode);

  	for (i = 0; i < LEVELS_PER_SLICE; i++)
  		si->level_to_irq[i] = -1;
  
  	/*

  	 * We use this so we can find the local hub's data as fast as only
  	 * possible.
  	 */
  	cpu_data[cpu].data = si;
  
  	cpu_time_init();
  	install_ipi();
  
  	/* Install our NMI handler if symmon hasn't installed one. */
  	install_cpu_nmi_handler(cputoslice(cpu));
  
  	set_c0_status(SRB_DEV0 | SRB_DEV1);

  }
  
  /*
   * get_nasid() returns the physical node id number of the caller.
   */
  nasid_t
  get_nasid(void)
  {
  	return (nasid_t)((LOCAL_HUB_L(NI_STATUS_REV_ID) & NSRI_NODEID_MASK)
  	                 >> NSRI_NODEID_SHFT);
  }
  
  /*
   * Map the physical node id to a virtual node id (virtual node ids are contiguous).
   */
  cnodeid_t get_compact_nodeid(void)
  {
  	return NASID_TO_COMPACT_NODEID(get_nasid());
  }

  static inline void ioc3_eth_init(void)
  {
  	struct ioc3 *ioc3;
  	nasid_t nid;
  
  	nid = get_nasid();
  	ioc3 = (struct ioc3 *) KL_CONFIG_CH_CONS_INFO(nid)->memory_base;
  
  	ioc3->eier = 0;
  }

  extern void ip27_reboot_setup(void);

  void __init plat_mem_setup(void)

  {
  	hubreg_t p, e, n_mode;
  	nasid_t nid;

  	ip27_reboot_setup();
  
  	/*
  	 * hub_rtc init and cpu clock intr enabled for later calibrate_delay.
  	 */
  	nid = get_nasid();
  	printk("IP27: Running on node %d.
  ", nid);
  
  	p = LOCAL_HUB_L(PI_CPU_PRESENT_A) & 1;
  	e = LOCAL_HUB_L(PI_CPU_ENABLE_A) & 1;
  	printk("Node %d has %s primary CPU%s.
  ", nid,
  	       p ? "a" : "no",
  	       e ? ", CPU is running" : "");
  
  	p = LOCAL_HUB_L(PI_CPU_PRESENT_B) & 1;
  	e = LOCAL_HUB_L(PI_CPU_ENABLE_B) & 1;
  	printk("Node %d has %s secondary CPU%s.
  ", nid,
  	       p ? "a" : "no",
  	       e ? ", CPU is running" : "");
  
  	/*
  	 * Try to catch kernel missconfigurations and give user an
  	 * indication what option to select.
  	 */
  	n_mode = LOCAL_HUB_L(NI_STATUS_REV_ID) & NSRI_MORENODES_MASK;
  	printk("Machine is in %c mode.
  ", n_mode ? 'N' : 'M');

  #ifdef CONFIG_SGI_SN_N_MODE

  	if (!n_mode)
  		panic("Kernel compiled for M mode.");
  #else
  	if (n_mode)
  		panic("Kernel compiled for N mode.");
  #endif

  	ioc3_eth_init();
  	per_cpu_init();
  
  	set_io_port_base(IO_BASE);

  }