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/*

 * Copyright (C) 2001-2004 Jakub Jermar

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#ifdef __SMP__

#include <arch/types.h>

#include <arch/apic.h>

#include <arch/ap.h>

#include <mm/page.h>

#include <time/delay.h>

#include <arch/interrupt.h>

#include <print.h>

#include <arch/mp.h>

#include <arch/asm.h>

#include <arch.h>

/*

 * This is functional, far-from-general-enough interface to the APIC.

 * Advanced Programmable Interrupt Controller for MP systems.

 * Tested on:

 *	Bochs 2.0.2 with 2-8 CPUs

 *	ASUS P/I-P65UP5 + ASUS C-P55T2D REV. 1.41 with 2x 200Mhz Pentium CPUs

 */

/*

 * These variables either stay configured as initilalized, or are changed by

 * the MP configuration code.

 *

 * Pay special attention to the volatile keyword. Without it, gcc -O2 would

 * optimize the code too much and accesses to l_apic and io_apic, that must

 * always be 32-bit, would use byte oriented instructions.

 */

volatile __u32 *l_apic = (__u32 *) 0xfee00000;

volatile __u32 *io_apic = (__u32 *) 0xfec00000;

__u32 apic_id_mask = 0;

int apic_poll_errors(void);

void apic_init(void)

{

	__u32 tmp, id, i;

	trap_register(VECTOR_APIC_SPUR, apic_spurious);

	enable_irqs_function = io_apic_enable_irqs;

	disable_irqs_function = io_apic_disable_irqs;

	eoi_function = l_apic_eoi;

	/*

	 * Configure interrupt routing.

	 * IRQ 0 remains masked as the time signal is generated by l_apic's themselves.

	 * Other interrupts will be forwarded to the lowest priority CPU.

	 */

	io_apic_disable_irqs(0xffff);

	trap_register(VECTOR_CLK, l_apic_timer_interrupt);

	for (i=1; i<16; i++) {

		int pin;

		if ((pin = mp_irq_to_pin(i)) != -1)

	    		io_apic_change_ioredtbl(pin,0xf,IVT_IRQBASE+i,LOPRI);

	}

	/*

	 * Ensure that io_apic has unique ID.

	 */

	tmp = io_apic_read(IOAPICID);

	id = (tmp >> 24) & 0xf;

	if ((1<<id) & apic_id_mask) {

		int i;

		for (i=0; i<15; i++) {

			if (!((1<<i) & apic_id_mask)) {

				io_apic_write(IOAPICID, (tmp & (~(0xf<<24))) | (i<<24));

				break;

			}

		}

	}

	/*

	 * Configure the BSP's lapic.

	 */

	l_apic_init();

	l_apic_debug();	

}

void apic_spurious(__u8 n, __u32 stack[])

{

	printf("cpu%d: APIC spurious interrupt\n", the->cpu->id);

}

int apic_poll_errors(void)

{

	__u32 esr;

	esr = l_apic[ESR] & ~ESRClear;

	if ((esr>>0) & 1)

		printf("Send CS Error\n");

	if ((esr>>1) & 1)

		printf("Receive CS Error\n");

	if ((esr>>2) & 1)

		printf("Send Accept Error\n");

	if ((esr>>3) & 1)

		printf("Receive Accept Error\n");

	if ((esr>>5) & 1)

		printf("Send Illegal Vector\n");

	if ((esr>>6) & 1)

		printf("Received Illegal Vector\n");

	if ((esr>>7) & 1)

		printf("Illegal Register Address\n");

	return !esr;

}

/*

 * Universal Start-up Algorithm for bringing up the AP processors.

 */

int l_apic_send_init_ipi(__u8 apicid)

{

	__u32 lo, hi;

	int i;

	/*

	 * Read the ICR register in and zero all non-reserved fields.

	 */

	lo = l_apic[ICRlo] & ICRloClear;

	hi = l_apic[ICRhi] & ICRhiClear;

	lo |= DLVRMODE_INIT | DESTMODE_PHYS | LEVEL_ASSERT | SHORTHAND_DEST | TRGRMODE_LEVEL;

	hi |= apicid << 24;

	l_apic[ICRhi] = hi;

	l_apic[ICRlo] = lo;

	/*

	 * According to MP Specification, 20us should be enough to

	 * deliver the IPI.

	 */

	delay(20);

	if (!apic_poll_errors()) return 0;

	lo = l_apic[ICRlo] & ICRloClear;

	if (lo & SEND_PENDING)

		printf("IPI is pending.\n");

	l_apic[ICRlo] = lo | DLVRMODE_INIT | DESTMODE_PHYS | LEVEL_DEASSERT | SHORTHAND_DEST | TRGRMODE_LEVEL;

	/*

	 * Wait 10ms as MP Specification specifies.

	 */

	delay(10000);

	/*

	 * MP specification says this should not be done for 82489DX-based

	 * l_apic's. However, everything is ok as long as STARTUP IPI is ignored

	 * by 8249DX.

	 */

	for (i = 0; i < 2; i++) {

		lo = l_apic[ICRlo] & ICRloClear;

		lo |= ((__address) ap_boot) / 4096; /* calculate the reset vector */

		l_apic[ICRlo] = lo | DLVRMODE_STUP | DESTMODE_PHYS | LEVEL_ASSERT | SHORTHAND_DEST |  TRGRMODE_LEVEL;

		delay(200);

	}

	return apic_poll_errors();

}

void l_apic_init(void)

{

	__u32 tmp, t1, t2;

	l_apic[LVT_Err] |= (1<<16);

	l_apic[LVT_LINT0] |= (1<<16);

	l_apic[LVT_LINT1] |= (1<<16);

	tmp = l_apic[SVR] & SVRClear;

	l_apic[SVR] = tmp | (1<<8) | (VECTOR_APIC_SPUR);

	l_apic[TPR] &= TPRClear;

	if (the->cpu->arch.family >= 6)

		enable_l_apic_in_msr();

	tmp = l_apic[ICRlo] & ICRloClear;

	l_apic[ICRlo] = tmp | DLVRMODE_INIT | DESTMODE_PHYS | LEVEL_DEASSERT | SHORTHAND_INCL | TRGRMODE_LEVEL;

	/*

	 * Program the timer for periodic mode and respective vector.

	 */

	l_apic[TDCR] &= TDCRClear;

	l_apic[TDCR] |= 0xb;

	tmp = l_apic[LVT_Tm] | (1<<17) | (VECTOR_CLK);

	l_apic[LVT_Tm] = tmp & ~(1<<16);

	t1 = l_apic[CCRT];

	l_apic[ICRT] = 0xffffffff;

	while (l_apic[CCRT] == t1)

		;

	t1 = l_apic[CCRT];

	delay(1000);

	t2 = l_apic[CCRT];

	l_apic[ICRT] = t1-t2;

}

void l_apic_eoi(void)

{

	l_apic[EOI] = 0;

}

void l_apic_debug(void)

{

#ifdef LAPIC_VERBOSE

	int i, lint;

	printf("LVT on cpu%d, LAPIC ID: %d\n", the->cpu->id, (l_apic[L_APIC_ID] >> 24)&0xf);

	printf("LVT_Tm: ");

	if (l_apic[LVT_Tm] & (1<<17)) printf("periodic"); else printf("one-shot"); putchar(',');	

	if (l_apic[LVT_Tm] & (1<<16)) printf("masked");	else printf("not masked"); putchar(',');

	if (l_apic[LVT_Tm] & (1<<12)) printf("send pending"); else printf("idle"); putchar(',');

	printf("%B\n", l_apic[LVT_Tm] & 0xff);

	for (i=0; i<2; i++) {

		lint = i ? LVT_LINT1 : LVT_LINT0;

		printf("LVT_LINT%d: ", i);

		if (l_apic[lint] & (1<<16)) printf("masked"); else printf("not masked"); putchar(',');

		if (l_apic[lint] & (1<<15)) printf("level"); else printf("edge"); putchar(',');

		printf("%d", l_apic[lint] & (1<<14)); putchar(',');

		printf("%d", l_apic[lint] & (1<<13)); putchar(',');

		if (l_apic[lint] & (1<<12)) printf("send pending"); else printf("idle"); putchar(',');

		switch ((l_apic[lint]>>8)&7) {

		    case 0: printf("fixed"); break;

		    case 4: printf("NMI"); break;

		    case 7: printf("ExtINT"); break;

		}

		putchar(',');

		printf("%B\n", l_apic[lint] & 0xff);	

	}

	printf("LVT_Err: ");

	if (l_apic[LVT_Err] & (1<<16)) printf("masked"); else printf("not masked"); putchar(',');

	if (l_apic[LVT_Err] & (1<<12)) printf("send pending"); else printf("idle"); putchar(',');

	printf("%B\n", l_apic[LVT_Err] & 0xff);	

	/*

	 * This register is supported only on P6 and higher.

	 */

	if (the->cpu->family > 5) {

		printf("LVT_PCINT: ");

		if (l_apic[LVT_PCINT] & (1<<16)) printf("masked"); else printf("not masked"); putchar(',');

		if (l_apic[LVT_PCINT] & (1<<12)) printf("send pending"); else printf("idle"); putchar(',');

		switch ((l_apic[LVT_PCINT] >> 8)&7) {

		    case 0: printf("fixed"); break;

		    case 4: printf("NMI"); break;

		    case 7: printf("ExtINT"); break;

		}

		putchar(',');

		printf("%B\n", l_apic[LVT_PCINT] & 0xff);

	}

#endif

}

void l_apic_timer_interrupt(__u8 n, __u32 stack[])

{

	l_apic_eoi();

	clock();

}

__u32 io_apic_read(__u8 address)

{

	__u32 tmp;

	tmp = io_apic[IOREGSEL] & ~0xf;

	io_apic[IOREGSEL] = tmp | address;

	return io_apic[IOWIN];

}

void io_apic_write(__u8 address, __u32 x)

{

	__u32 tmp;

	tmp = io_apic[IOREGSEL] & ~0xf;

	io_apic[IOREGSEL] = tmp | address;

	io_apic[IOWIN] = x;

}

void io_apic_change_ioredtbl(int signal, int dest, __u8 v, int flags)

{

	__u32 reglo, reghi;

	int dlvr = 0;

	if (flags & LOPRI)

		dlvr = 1;

	reglo = io_apic_read(IOREDTBL + signal*2);

	reghi = io_apic_read(IOREDTBL + signal*2 + 1);

	reghi &= ~0x0f000000;

	reghi |= (dest<<24);

	reglo &= (~0x1ffff) | (1<<16); /* don't touch the mask */

	reglo |= (0<<15) | (0<<13) | (0<<11) | (dlvr<<8) | v;

	io_apic_write(IOREDTBL + signal*2, reglo);		

	io_apic_write(IOREDTBL + signal*2 + 1, reghi);

}

void io_apic_disable_irqs(__u16 irqmask)

{

	int i,pin;

	__u32 reglo;

	for (i=0;i<16;i++) {

		if ((irqmask>>i) & 1) {

			/*

			 * Mask the signal input in IO APIC if there is a

			 * mapping for the respective IRQ number.

			 */

			pin = mp_irq_to_pin(i);

			if (pin != -1) {

				reglo = io_apic_read(IOREDTBL + pin*2);

				reglo |= (1<<16);

				io_apic_write(IOREDTBL + pin*2,reglo);

			}

		}

	}

}

void io_apic_enable_irqs(__u16 irqmask)

{

	int i,pin;

	__u32 reglo;

	for (i=0;i<16;i++) {

		if ((irqmask>>i) & 1) {

			/*

			 * Unmask the signal input in IO APIC if there is a

			 * mapping for the respective IRQ number.

			 */

			pin = mp_irq_to_pin(i);

			if (pin != -1) {

				reglo = io_apic_read(IOREDTBL + pin*2);

				reglo &= ~(1<<16);

				io_apic_write(IOREDTBL + pin*2,reglo);

			}

		}

	}

}

#endif /* __SMP__ */