/*
 * 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/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/smp.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 __init 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 accidently
	 * 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());
}

/* Extracted from the IOC3 meta driver.  FIXME.  */
static inline void ioc3_sio_init(void)
{
	struct ioc3 *ioc3;
	nasid_t nid;
	long loops;

	nid = get_nasid();
	ioc3 = (struct ioc3 *) KL_CONFIG_CH_CONS_INFO(nid)->memory_base;

	ioc3->sscr_a = 0;			/* PIO mode for uarta.  */
	ioc3->sscr_b = 0;			/* PIO mode for uartb.  */
	ioc3->sio_iec = ~0;
	ioc3->sio_ies = (SIO_IR_SA_INT | SIO_IR_SB_INT);

	loops=1000000; while(loops--);
	ioc3->sregs.uarta.iu_fcr = 0;
	ioc3->sregs.uartb.iu_fcr = 0;
	loops=1000000; while(loops--);
}

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.\n", 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.\n", 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.\n", 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", 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_sio_init();
	ioc3_eth_init();
	per_cpu_init();

	set_io_port_base(IO_BASE);
}
