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qemu/hw/openpic.c
j_mayer e9df014c0b Implement embedded IRQ controller for PowerPC 6xx/740 & 750. 
Fix PowerPC external interrupt input handling and lowering.
Fix OpenPIC output pins management.
Fix multiples bugs in OpenPIC IRQ management.
Fix OpenPIC CPU(s) reset function.
Fix Mac99 machine to properly route OpenPIC outputs to the PowerPC input pins.
Fix PREP machine to properly route i8259 output to the PowerPC external
  interrupt pin.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2647 c046a42c-6fe2-441c-8c8c-71466251a162
2007-04-09 22:45:36 +00:00

1065 lines
28 KiB
C
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/*
* OpenPIC emulation
*
* Copyright (c) 2004 Jocelyn Mayer
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/*
*
* Based on OpenPic implementations:
* - Intel GW80314 I/O compagnion chip developper's manual
* - Motorola MPC8245 & MPC8540 user manuals.
* - Motorola MCP750 (aka Raven) programmer manual.
* - Motorola Harrier programmer manuel
*
* Serial interrupts, as implemented in Raven chipset are not supported yet.
*
*/
#include "vl.h"
//#define DEBUG_OPENPIC
#ifdef DEBUG_OPENPIC
#define DPRINTF(fmt, args...) do { printf(fmt , ##args); } while (0)
#else
#define DPRINTF(fmt, args...) do { } while (0)
#endif
#define ERROR(fmr, args...) do { printf("ERROR: " fmr , ##args); } while (0)
#define USE_MPCxxx /* Intel model is broken, for now */
#if defined (USE_INTEL_GW80314)
/* Intel GW80314 I/O Companion chip */
#define MAX_CPU 4
#define MAX_IRQ 32
#define MAX_DBL 4
#define MAX_MBX 4
#define MAX_TMR 4
#define VECTOR_BITS 8
#define MAX_IPI 0
#define VID (0x00000000)
#define OPENPIC_LITTLE_ENDIAN 1
#define OPENPIC_BIG_ENDIAN 0
#elif defined(USE_MPCxxx)
#define MAX_CPU 2
#define MAX_IRQ 64
#define EXT_IRQ 48
#define MAX_DBL 0
#define MAX_MBX 0
#define MAX_TMR 4
#define VECTOR_BITS 8
#define MAX_IPI 4
#define VID 0x03 /* MPIC version ID */
#define VENI 0x00000000 /* Vendor ID */
enum {
IRQ_IPVP = 0,
IRQ_IDE,
};
#define OPENPIC_LITTLE_ENDIAN 1
#define OPENPIC_BIG_ENDIAN 0
#else
#error "Please select which OpenPic implementation is to be emulated"
#endif
#if (OPENPIC_BIG_ENDIAN && !TARGET_WORDS_BIGENDIAN) || \
(OPENPIC_LITTLE_ENDIAN && TARGET_WORDS_BIGENDIAN)
#define OPENPIC_SWAP
#endif
/* Interrupt definitions */
#define IRQ_FE (EXT_IRQ) /* Internal functional IRQ */
#define IRQ_ERR (EXT_IRQ + 1) /* Error IRQ */
#define IRQ_TIM0 (EXT_IRQ + 2) /* First timer IRQ */
#if MAX_IPI > 0
#define IRQ_IPI0 (IRQ_TIM0 + MAX_TMR) /* First IPI IRQ */
#define IRQ_DBL0 (IRQ_IPI0 + (MAX_CPU * MAX_IPI)) /* First doorbell IRQ */
#else
#define IRQ_DBL0 (IRQ_TIM0 + MAX_TMR) /* First doorbell IRQ */
#define IRQ_MBX0 (IRQ_DBL0 + MAX_DBL) /* First mailbox IRQ */
#endif
#define BF_WIDTH(_bits_) \
(((_bits_) + (sizeof(uint32_t) * 8) - 1) / (sizeof(uint32_t) * 8))
static inline void set_bit (uint32_t *field, int bit)
{
field[bit >> 5] |= 1 << (bit & 0x1F);
}
static inline void reset_bit (uint32_t *field, int bit)
{
field[bit >> 5] &= ~(1 << (bit & 0x1F));
}
static inline int test_bit (uint32_t *field, int bit)
{
return (field[bit >> 5] & 1 << (bit & 0x1F)) != 0;
}
enum {
IRQ_EXTERNAL = 0x01,
IRQ_INTERNAL = 0x02,
IRQ_TIMER = 0x04,
IRQ_SPECIAL = 0x08,
} IRQ_src_type;
typedef struct IRQ_queue_t {
uint32_t queue[BF_WIDTH(MAX_IRQ)];
int next;
int priority;
} IRQ_queue_t;
typedef struct IRQ_src_t {
uint32_t ipvp; /* IRQ vector/priority register */
uint32_t ide; /* IRQ destination register */
int type;
int last_cpu;
int pending; /* TRUE if IRQ is pending */
} IRQ_src_t;
enum IPVP_bits {
IPVP_MASK = 31,
IPVP_ACTIVITY = 30,
IPVP_MODE = 29,
IPVP_POLARITY = 23,
IPVP_SENSE = 22,
};
#define IPVP_PRIORITY_MASK (0x1F << 16)
#define IPVP_PRIORITY(_ipvpr_) ((int)(((_ipvpr_) & IPVP_PRIORITY_MASK) >> 16))
#define IPVP_VECTOR_MASK ((1 << VECTOR_BITS) - 1)
#define IPVP_VECTOR(_ipvpr_) ((_ipvpr_) & IPVP_VECTOR_MASK)
typedef struct IRQ_dst_t {
uint32_t pctp; /* CPU current task priority */
uint32_t pcsr; /* CPU sensitivity register */
IRQ_queue_t raised;
IRQ_queue_t servicing;
qemu_irq *irqs;
} IRQ_dst_t;
typedef struct openpic_t {
PCIDevice pci_dev;
int mem_index;
/* Global registers */
uint32_t frep; /* Feature reporting register */
uint32_t glbc; /* Global configuration register */
uint32_t micr; /* MPIC interrupt configuration register */
uint32_t veni; /* Vendor identification register */
uint32_t pint; /* Processor initialization register */
uint32_t spve; /* Spurious vector register */
uint32_t tifr; /* Timer frequency reporting register */
/* Source registers */
IRQ_src_t src[MAX_IRQ];
/* Local registers per output pin */
IRQ_dst_t dst[MAX_CPU];
int nb_cpus;
/* Timer registers */
struct {
uint32_t ticc; /* Global timer current count register */
uint32_t tibc; /* Global timer base count register */
} timers[MAX_TMR];
#if MAX_DBL > 0
/* Doorbell registers */
uint32_t dar; /* Doorbell activate register */
struct {
uint32_t dmr; /* Doorbell messaging register */
} doorbells[MAX_DBL];
#endif
#if MAX_MBX > 0
/* Mailbox registers */
struct {
uint32_t mbr; /* Mailbox register */
} mailboxes[MAX_MAILBOXES];
#endif
/* IRQ out is used when in bypass mode (not implemented) */
qemu_irq irq_out;
} openpic_t;
static inline void IRQ_setbit (IRQ_queue_t *q, int n_IRQ)
{
set_bit(q->queue, n_IRQ);
}
static inline void IRQ_resetbit (IRQ_queue_t *q, int n_IRQ)
{
reset_bit(q->queue, n_IRQ);
}
static inline int IRQ_testbit (IRQ_queue_t *q, int n_IRQ)
{
return test_bit(q->queue, n_IRQ);
}
static void IRQ_check (openpic_t *opp, IRQ_queue_t *q)
{
int next, i;
int priority;
next = -1;
priority = -1;
for (i = 0; i < MAX_IRQ; i++) {
if (IRQ_testbit(q, i)) {
DPRINTF("IRQ_check: irq %d set ipvp_pr=%d pr=%d\n",
i, IPVP_PRIORITY(opp->src[i].ipvp), priority);
if (IPVP_PRIORITY(opp->src[i].ipvp) > priority) {
next = i;
priority = IPVP_PRIORITY(opp->src[i].ipvp);
}
}
}
q->next = next;
q->priority = priority;
}
static int IRQ_get_next (openpic_t *opp, IRQ_queue_t *q)
{
if (q->next == -1) {
/* XXX: optimize */
IRQ_check(opp, q);
}
return q->next;
}
static void IRQ_local_pipe (openpic_t *opp, int n_CPU, int n_IRQ)
{
IRQ_dst_t *dst;
IRQ_src_t *src;
int priority;
dst = &opp->dst[n_CPU];
src = &opp->src[n_IRQ];
priority = IPVP_PRIORITY(src->ipvp);
if (priority <= dst->pctp) {
/* Too low priority */
DPRINTF("%s: IRQ %d has too low priority on CPU %d\n",
__func__, n_IRQ, n_CPU);
return;
}
if (IRQ_testbit(&dst->raised, n_IRQ)) {
/* Interrupt miss */
DPRINTF("%s: IRQ %d was missed on CPU %d\n",
__func__, n_IRQ, n_CPU);
return;
}
set_bit(&src->ipvp, IPVP_ACTIVITY);
IRQ_setbit(&dst->raised, n_IRQ);
if (priority < dst->raised.priority) {
/* An higher priority IRQ is already raised */
DPRINTF("%s: IRQ %d is hidden by raised IRQ %d on CPU %d\n",
__func__, n_IRQ, dst->raised.next, n_CPU);
return;
}
IRQ_get_next(opp, &dst->raised);
if (IRQ_get_next(opp, &dst->servicing) != -1 &&
priority < dst->servicing.priority) {
DPRINTF("%s: IRQ %d is hidden by servicing IRQ %d on CPU %d\n",
__func__, n_IRQ, dst->servicing.next, n_CPU);
/* Already servicing a higher priority IRQ */
return;
}
DPRINTF("Raise OpenPIC INT output cpu %d irq %d\n", n_CPU, n_IRQ);
qemu_irq_raise(dst->irqs[OPENPIC_OUTPUT_INT]);
}
/* update pic state because registers for n_IRQ have changed value */
static void openpic_update_irq(openpic_t *opp, int n_IRQ)
{
IRQ_src_t *src;
int i;
src = &opp->src[n_IRQ];
if (!src->pending) {
/* no irq pending */
DPRINTF("%s: IRQ %d is not pending\n", __func__, n_IRQ);
return;
}
if (test_bit(&src->ipvp, IPVP_MASK)) {
/* Interrupt source is disabled */
DPRINTF("%s: IRQ %d is disabled\n", __func__, n_IRQ);
return;
}
if (IPVP_PRIORITY(src->ipvp) == 0) {
/* Priority set to zero */
DPRINTF("%s: IRQ %d has 0 priority\n", __func__, n_IRQ);
return;
}
if (test_bit(&src->ipvp, IPVP_ACTIVITY)) {
/* IRQ already active */
DPRINTF("%s: IRQ %d is already active\n", __func__, n_IRQ);
return;
}
if (src->ide == 0x00000000) {
/* No target */
DPRINTF("%s: IRQ %d has no target\n", __func__, n_IRQ);
return;
}
if (src->ide == (1 << src->last_cpu)) {
/* Only one CPU is allowed to receive this IRQ */
IRQ_local_pipe(opp, src->last_cpu, n_IRQ);
} else if (!test_bit(&src->ipvp, IPVP_MODE)) {
/* Directed delivery mode */
for (i = 0; i < opp->nb_cpus; i++) {
if (test_bit(&src->ide, i))
IRQ_local_pipe(opp, i, n_IRQ);
}
} else {
/* Distributed delivery mode */
for (i = src->last_cpu + 1; i != src->last_cpu; i++) {
if (i == opp->nb_cpus)
i = 0;
if (test_bit(&src->ide, i)) {
IRQ_local_pipe(opp, i, n_IRQ);
src->last_cpu = i;
break;
}
}
}
}
static void openpic_set_irq(void *opaque, int n_IRQ, int level)
{
openpic_t *opp = opaque;
IRQ_src_t *src;
src = &opp->src[n_IRQ];
DPRINTF("openpic: set irq %d = %d ipvp=%08x\n",
n_IRQ, level, src->ipvp);
if (test_bit(&src->ipvp, IPVP_SENSE)) {
/* level-sensitive irq */
src->pending = level;
if (!level)
reset_bit(&src->ipvp, IPVP_ACTIVITY);
} else {
/* edge-sensitive irq */
if (level)
src->pending = 1;
}
openpic_update_irq(opp, n_IRQ);
}
static void openpic_reset (openpic_t *opp)
{
int i;
opp->glbc = 0x80000000;
/* Initialise controller registers */
opp->frep = ((EXT_IRQ - 1) << 16) | ((MAX_CPU - 1) << 8) | VID;
opp->veni = VENI;
opp->pint = 0x00000000;
opp->spve = 0x000000FF;
opp->tifr = 0x003F7A00;
/* ? */
opp->micr = 0x00000000;
/* Initialise IRQ sources */
for (i = 0; i < MAX_IRQ; i++) {
opp->src[i].ipvp = 0xA0000000;
opp->src[i].ide = 0x00000000;
}
/* Initialise IRQ destinations */
for (i = 0; i < MAX_CPU; i++) {
opp->dst[i].pctp = 0x0000000F;
opp->dst[i].pcsr = 0x00000000;
memset(&opp->dst[i].raised, 0, sizeof(IRQ_queue_t));
memset(&opp->dst[i].servicing, 0, sizeof(IRQ_queue_t));
}
/* Initialise timers */
for (i = 0; i < MAX_TMR; i++) {
opp->timers[i].ticc = 0x00000000;
opp->timers[i].tibc = 0x80000000;
}
/* Initialise doorbells */
#if MAX_DBL > 0
opp->dar = 0x00000000;
for (i = 0; i < MAX_DBL; i++) {
opp->doorbells[i].dmr = 0x00000000;
}
#endif
/* Initialise mailboxes */
#if MAX_MBX > 0
for (i = 0; i < MAX_MBX; i++) { /* ? */
opp->mailboxes[i].mbr = 0x00000000;
}
#endif
/* Go out of RESET state */
opp->glbc = 0x00000000;
}
static inline uint32_t read_IRQreg (openpic_t *opp, int n_IRQ, uint32_t reg)
{
uint32_t retval;
switch (reg) {
case IRQ_IPVP:
retval = opp->src[n_IRQ].ipvp;
break;
case IRQ_IDE:
retval = opp->src[n_IRQ].ide;
break;
}
return retval;
}
static inline void write_IRQreg (openpic_t *opp, int n_IRQ,
uint32_t reg, uint32_t val)
{
uint32_t tmp;
switch (reg) {
case IRQ_IPVP:
/* NOTE: not fully accurate for special IRQs, but simple and
sufficient */
/* ACTIVITY bit is read-only */
opp->src[n_IRQ].ipvp =
(opp->src[n_IRQ].ipvp & 0x40000000) |
(val & 0x800F00FF);
openpic_update_irq(opp, n_IRQ);
DPRINTF("Set IPVP %d to 0x%08x -> 0x%08x\n",
n_IRQ, val, opp->src[n_IRQ].ipvp);
break;
case IRQ_IDE:
tmp = val & 0xC0000000;
tmp |= val & ((1 << MAX_CPU) - 1);
opp->src[n_IRQ].ide = tmp;
DPRINTF("Set IDE %d to 0x%08x\n", n_IRQ, opp->src[n_IRQ].ide);
break;
}
}
#if 0 // Code provision for Intel model
#if MAX_DBL > 0
static uint32_t read_doorbell_register (openpic_t *opp,
int n_dbl, uint32_t offset)
{
uint32_t retval;
switch (offset) {
case DBL_IPVP_OFFSET:
retval = read_IRQreg(opp, IRQ_DBL0 + n_dbl, IRQ_IPVP);
break;
case DBL_IDE_OFFSET:
retval = read_IRQreg(opp, IRQ_DBL0 + n_dbl, IRQ_IDE);
break;
case DBL_DMR_OFFSET:
retval = opp->doorbells[n_dbl].dmr;
break;
}
return retval;
}
static void write_doorbell_register (penpic_t *opp, int n_dbl,
uint32_t offset, uint32_t value)
{
switch (offset) {
case DBL_IVPR_OFFSET:
write_IRQreg(opp, IRQ_DBL0 + n_dbl, IRQ_IPVP, value);
break;
case DBL_IDE_OFFSET:
write_IRQreg(opp, IRQ_DBL0 + n_dbl, IRQ_IDE, value);
break;
case DBL_DMR_OFFSET:
opp->doorbells[n_dbl].dmr = value;
break;
}
}
#endif
#if MAX_MBX > 0
static uint32_t read_mailbox_register (openpic_t *opp,
int n_mbx, uint32_t offset)
{
uint32_t retval;
switch (offset) {
case MBX_MBR_OFFSET:
retval = opp->mailboxes[n_mbx].mbr;
break;
case MBX_IVPR_OFFSET:
retval = read_IRQreg(opp, IRQ_MBX0 + n_mbx, IRQ_IPVP);
break;
case MBX_DMR_OFFSET:
retval = read_IRQreg(opp, IRQ_MBX0 + n_mbx, IRQ_IDE);
break;
}
return retval;
}
static void write_mailbox_register (openpic_t *opp, int n_mbx,
uint32_t address, uint32_t value)
{
switch (offset) {
case MBX_MBR_OFFSET:
opp->mailboxes[n_mbx].mbr = value;
break;
case MBX_IVPR_OFFSET:
write_IRQreg(opp, IRQ_MBX0 + n_mbx, IRQ_IPVP, value);
break;
case MBX_DMR_OFFSET:
write_IRQreg(opp, IRQ_MBX0 + n_mbx, IRQ_IDE, value);
break;
}
}
#endif
#endif /* 0 : Code provision for Intel model */
static void openpic_gbl_write (void *opaque, uint32_t addr, uint32_t val)
{
openpic_t *opp = opaque;
IRQ_dst_t *dst;
int idx;
DPRINTF("%s: addr %08x <= %08x\n", __func__, addr, val);
if (addr & 0xF)
return;
#if defined OPENPIC_SWAP
val = bswap32(val);
#endif
addr &= 0xFF;
switch (addr) {
case 0x00: /* FREP */
break;
case 0x20: /* GLBC */
if (val & 0x80000000)
openpic_reset(opp);
opp->glbc = val & ~0x80000000;
break;
case 0x80: /* VENI */
break;
case 0x90: /* PINT */
for (idx = 0; idx < opp->nb_cpus; idx++) {
if ((val & (1 << idx)) && !(opp->pint & (1 << idx))) {
DPRINTF("Raise OpenPIC RESET output for CPU %d\n", idx);
dst = &opp->dst[idx];
qemu_irq_raise(dst->irqs[OPENPIC_OUTPUT_RESET]);
} else if (!(val & (1 << idx)) && (opp->pint & (1 << idx))) {
DPRINTF("Lower OpenPIC RESET output for CPU %d\n", idx);
dst = &opp->dst[idx];
qemu_irq_lower(dst->irqs[OPENPIC_OUTPUT_RESET]);
}
}
opp->pint = val;
break;
#if MAX_IPI > 0
case 0xA0: /* IPI_IPVP */
case 0xB0:
case 0xC0:
case 0xD0:
{
int idx;
idx = (addr - 0xA0) >> 4;
write_IRQreg(opp, IRQ_IPI0 + idx, IRQ_IPVP, val);
}
break;
#endif
case 0xE0: /* SPVE */
opp->spve = val & 0x000000FF;
break;
case 0xF0: /* TIFR */
opp->tifr = val;
break;
default:
break;
}
}
static uint32_t openpic_gbl_read (void *opaque, uint32_t addr)
{
openpic_t *opp = opaque;
uint32_t retval;
DPRINTF("%s: addr %08x\n", __func__, addr);
retval = 0xFFFFFFFF;
if (addr & 0xF)
return retval;
addr &= 0xFF;
switch (addr) {
case 0x00: /* FREP */
retval = opp->frep;
break;
case 0x20: /* GLBC */
retval = opp->glbc;
break;
case 0x80: /* VENI */
retval = opp->veni;
break;
case 0x90: /* PINT */
retval = 0x00000000;
break;
#if MAX_IPI > 0
case 0xA0: /* IPI_IPVP */
case 0xB0:
case 0xC0:
case 0xD0:
{
int idx;
idx = (addr - 0xA0) >> 4;
retval = read_IRQreg(opp, IRQ_IPI0 + idx, IRQ_IPVP);
}
break;
#endif
case 0xE0: /* SPVE */
retval = opp->spve;
break;
case 0xF0: /* TIFR */
retval = opp->tifr;
break;
default:
break;
}
DPRINTF("%s: => %08x\n", __func__, retval);
#if defined OPENPIC_SWAP
retval = bswap32(retval);
#endif
return retval;
}
static void openpic_timer_write (void *opaque, uint32_t addr, uint32_t val)
{
openpic_t *opp = opaque;
int idx;
DPRINTF("%s: addr %08x <= %08x\n", __func__, addr, val);
if (addr & 0xF)
return;
#if defined OPENPIC_SWAP
val = bswap32(val);
#endif
addr -= 0x1100;
addr &= 0xFFFF;
idx = (addr & 0xFFF0) >> 6;
addr = addr & 0x30;
switch (addr) {
case 0x00: /* TICC */
break;
case 0x10: /* TIBC */
if ((opp->timers[idx].ticc & 0x80000000) != 0 &&
(val & 0x80000000) == 0 &&
(opp->timers[idx].tibc & 0x80000000) != 0)
opp->timers[idx].ticc &= ~0x80000000;
opp->timers[idx].tibc = val;
break;
case 0x20: /* TIVP */
write_IRQreg(opp, IRQ_TIM0 + idx, IRQ_IPVP, val);
break;
case 0x30: /* TIDE */
write_IRQreg(opp, IRQ_TIM0 + idx, IRQ_IDE, val);
break;
}
}
static uint32_t openpic_timer_read (void *opaque, uint32_t addr)
{
openpic_t *opp = opaque;
uint32_t retval;
int idx;
DPRINTF("%s: addr %08x\n", __func__, addr);
retval = 0xFFFFFFFF;
if (addr & 0xF)
return retval;
addr -= 0x1100;
addr &= 0xFFFF;
idx = (addr & 0xFFF0) >> 6;
addr = addr & 0x30;
switch (addr) {
case 0x00: /* TICC */
retval = opp->timers[idx].ticc;
break;
case 0x10: /* TIBC */
retval = opp->timers[idx].tibc;
break;
case 0x20: /* TIPV */
retval = read_IRQreg(opp, IRQ_TIM0 + idx, IRQ_IPVP);
break;
case 0x30: /* TIDE */
retval = read_IRQreg(opp, IRQ_TIM0 + idx, IRQ_IDE);
break;
}
DPRINTF("%s: => %08x\n", __func__, retval);
#if defined OPENPIC_SWAP
retval = bswap32(retval);
#endif
return retval;
}
static void openpic_src_write (void *opaque, uint32_t addr, uint32_t val)
{
openpic_t *opp = opaque;
int idx;
DPRINTF("%s: addr %08x <= %08x\n", __func__, addr, val);
if (addr & 0xF)
return;
#if defined OPENPIC_SWAP
val = tswap32(val);
#endif
addr = addr & 0xFFF0;
idx = addr >> 5;
if (addr & 0x10) {
/* EXDE / IFEDE / IEEDE */
write_IRQreg(opp, idx, IRQ_IDE, val);
} else {
/* EXVP / IFEVP / IEEVP */
write_IRQreg(opp, idx, IRQ_IPVP, val);
}
}
static uint32_t openpic_src_read (void *opaque, uint32_t addr)
{
openpic_t *opp = opaque;
uint32_t retval;
int idx;
DPRINTF("%s: addr %08x\n", __func__, addr);
retval = 0xFFFFFFFF;
if (addr & 0xF)
return retval;
addr = addr & 0xFFF0;
idx = addr >> 5;
if (addr & 0x10) {
/* EXDE / IFEDE / IEEDE */
retval = read_IRQreg(opp, idx, IRQ_IDE);
} else {
/* EXVP / IFEVP / IEEVP */
retval = read_IRQreg(opp, idx, IRQ_IPVP);
}
DPRINTF("%s: => %08x\n", __func__, retval);
#if defined OPENPIC_SWAP
retval = tswap32(retval);
#endif
return retval;
}
static void openpic_cpu_write (void *opaque, uint32_t addr, uint32_t val)
{
openpic_t *opp = opaque;
IRQ_src_t *src;
IRQ_dst_t *dst;
int idx, s_IRQ, n_IRQ;
DPRINTF("%s: addr %08x <= %08x\n", __func__, addr, val);
if (addr & 0xF)
return;
#if defined OPENPIC_SWAP
val = bswap32(val);
#endif
addr &= 0x1FFF0;
idx = addr / 0x1000;
dst = &opp->dst[idx];
addr &= 0xFF0;
switch (addr) {
#if MAX_IPI > 0
case 0x40: /* PIPD */
case 0x50:
case 0x60:
case 0x70:
idx = (addr - 0x40) >> 4;
write_IRQreg(opp, IRQ_IPI0 + idx, IRQ_IDE, val);
openpic_set_irq(opp, IRQ_IPI0 + idx, 1);
openpic_set_irq(opp, IRQ_IPI0 + idx, 0);
break;
#endif
case 0x80: /* PCTP */
dst->pctp = val & 0x0000000F;
break;
case 0x90: /* WHOAMI */
/* Read-only register */
break;
case 0xA0: /* PIAC */
/* Read-only register */
break;
case 0xB0: /* PEOI */
DPRINTF("PEOI\n");
s_IRQ = IRQ_get_next(opp, &dst->servicing);
IRQ_resetbit(&dst->servicing, s_IRQ);
dst->servicing.next = -1;
/* Set up next servicing IRQ */
s_IRQ = IRQ_get_next(opp, &dst->servicing);
/* Check queued interrupts. */
n_IRQ = IRQ_get_next(opp, &dst->raised);
src = &opp->src[n_IRQ];
if (n_IRQ != -1 &&
(s_IRQ == -1 ||
IPVP_PRIORITY(src->ipvp) > dst->servicing.priority)) {
DPRINTF("Raise OpenPIC INT output cpu %d irq %d\n",
idx, n_IRQ);
qemu_irq_raise(dst->irqs[OPENPIC_OUTPUT_INT]);
}
break;
default:
break;
}
}
static uint32_t openpic_cpu_read (void *opaque, uint32_t addr)
{
openpic_t *opp = opaque;
IRQ_src_t *src;
IRQ_dst_t *dst;
uint32_t retval;
int idx, n_IRQ;
DPRINTF("%s: addr %08x\n", __func__, addr);
retval = 0xFFFFFFFF;
if (addr & 0xF)
return retval;
addr &= 0x1FFF0;
idx = addr / 0x1000;
dst = &opp->dst[idx];
addr &= 0xFF0;
switch (addr) {
case 0x80: /* PCTP */
retval = dst->pctp;
break;
case 0x90: /* WHOAMI */
retval = idx;
break;
case 0xA0: /* PIAC */
DPRINTF("Lower OpenPIC INT output\n");
qemu_irq_lower(dst->irqs[OPENPIC_OUTPUT_INT]);
n_IRQ = IRQ_get_next(opp, &dst->raised);
DPRINTF("PIAC: irq=%d\n", n_IRQ);
if (n_IRQ == -1) {
/* No more interrupt pending */
retval = IPVP_VECTOR(opp->spve);
} else {
src = &opp->src[n_IRQ];
if (!test_bit(&src->ipvp, IPVP_ACTIVITY) ||
!(IPVP_PRIORITY(src->ipvp) > dst->pctp)) {
/* - Spurious level-sensitive IRQ
* - Priorities has been changed
* and the pending IRQ isn't allowed anymore
*/
reset_bit(&src->ipvp, IPVP_ACTIVITY);
retval = IPVP_VECTOR(opp->spve);
} else {
/* IRQ enter servicing state */
IRQ_setbit(&dst->servicing, n_IRQ);
retval = IPVP_VECTOR(src->ipvp);
}
IRQ_resetbit(&dst->raised, n_IRQ);
dst->raised.next = -1;
if (!test_bit(&src->ipvp, IPVP_SENSE)) {
/* edge-sensitive IRQ */
reset_bit(&src->ipvp, IPVP_ACTIVITY);
src->pending = 0;
}
}
break;
case 0xB0: /* PEOI */
retval = 0;
break;
#if MAX_IPI > 0
case 0x40: /* IDE */
case 0x50:
idx = (addr - 0x40) >> 4;
retval = read_IRQreg(opp, IRQ_IPI0 + idx, IRQ_IDE);
break;
#endif
default:
break;
}
DPRINTF("%s: => %08x\n", __func__, retval);
#if defined OPENPIC_SWAP
retval= bswap32(retval);
#endif
return retval;
}
static void openpic_buggy_write (void *opaque,
target_phys_addr_t addr, uint32_t val)
{
printf("Invalid OPENPIC write access !\n");
}
static uint32_t openpic_buggy_read (void *opaque, target_phys_addr_t addr)
{
printf("Invalid OPENPIC read access !\n");
return -1;
}
static void openpic_writel (void *opaque,
target_phys_addr_t addr, uint32_t val)
{
openpic_t *opp = opaque;
addr &= 0x3FFFF;
DPRINTF("%s: offset %08x val: %08x\n", __func__, (int)addr, val);
if (addr < 0x1100) {
/* Global registers */
openpic_gbl_write(opp, addr, val);
} else if (addr < 0x10000) {
/* Timers registers */
openpic_timer_write(opp, addr, val);
} else if (addr < 0x20000) {
/* Source registers */
openpic_src_write(opp, addr, val);
} else {
/* CPU registers */
openpic_cpu_write(opp, addr, val);
}
}
static uint32_t openpic_readl (void *opaque,target_phys_addr_t addr)
{
openpic_t *opp = opaque;
uint32_t retval;
addr &= 0x3FFFF;
DPRINTF("%s: offset %08x\n", __func__, (int)addr);
if (addr < 0x1100) {
/* Global registers */
retval = openpic_gbl_read(opp, addr);
} else if (addr < 0x10000) {
/* Timers registers */
retval = openpic_timer_read(opp, addr);
} else if (addr < 0x20000) {
/* Source registers */
retval = openpic_src_read(opp, addr);
} else {
/* CPU registers */
retval = openpic_cpu_read(opp, addr);
}
return retval;
}
static CPUWriteMemoryFunc *openpic_write[] = {
&openpic_buggy_write,
&openpic_buggy_write,
&openpic_writel,
};
static CPUReadMemoryFunc *openpic_read[] = {
&openpic_buggy_read,
&openpic_buggy_read,
&openpic_readl,
};
static void openpic_map(PCIDevice *pci_dev, int region_num,
uint32_t addr, uint32_t size, int type)
{
openpic_t *opp;
DPRINTF("Map OpenPIC\n");
opp = (openpic_t *)pci_dev;
/* Global registers */
DPRINTF("Register OPENPIC gbl %08x => %08x\n",
addr + 0x1000, addr + 0x1000 + 0x100);
/* Timer registers */
DPRINTF("Register OPENPIC timer %08x => %08x\n",
addr + 0x1100, addr + 0x1100 + 0x40 * MAX_TMR);
/* Interrupt source registers */
DPRINTF("Register OPENPIC src %08x => %08x\n",
addr + 0x10000, addr + 0x10000 + 0x20 * (EXT_IRQ + 2));
/* Per CPU registers */
DPRINTF("Register OPENPIC dst %08x => %08x\n",
addr + 0x20000, addr + 0x20000 + 0x1000 * MAX_CPU);
cpu_register_physical_memory(addr, 0x40000, opp->mem_index);
#if 0 // Don't implement ISU for now
opp_io_memory = cpu_register_io_memory(0, openpic_src_read,
openpic_src_write);
cpu_register_physical_memory(isu_base, 0x20 * (EXT_IRQ + 2),
opp_io_memory);
#endif
}
qemu_irq *openpic_init (PCIBus *bus, int *pmem_index, int nb_cpus,
qemu_irq **irqs, qemu_irq irq_out)
{
openpic_t *opp;
uint8_t *pci_conf;
int i, m;
/* XXX: for now, only one CPU is supported */
if (nb_cpus != 1)
return NULL;
if (bus) {
opp = (openpic_t *)pci_register_device(bus, "OpenPIC", sizeof(openpic_t),
-1, NULL, NULL);
if (opp == NULL)
return NULL;
pci_conf = opp->pci_dev.config;
pci_conf[0x00] = 0x14; // IBM MPIC2
pci_conf[0x01] = 0x10;
pci_conf[0x02] = 0xFF;
pci_conf[0x03] = 0xFF;
pci_conf[0x0a] = 0x80; // PIC
pci_conf[0x0b] = 0x08;
pci_conf[0x0e] = 0x00; // header_type
pci_conf[0x3d] = 0x00; // no interrupt pin
/* Register I/O spaces */
pci_register_io_region((PCIDevice *)opp, 0, 0x40000,
PCI_ADDRESS_SPACE_MEM, &openpic_map);
} else {
opp = qemu_mallocz(sizeof(openpic_t));
}
opp->mem_index = cpu_register_io_memory(0, openpic_read,
openpic_write, opp);
// isu_base &= 0xFFFC0000;
opp->nb_cpus = nb_cpus;
/* Set IRQ types */
for (i = 0; i < EXT_IRQ; i++) {
opp->src[i].type = IRQ_EXTERNAL;
}
for (; i < IRQ_TIM0; i++) {
opp->src[i].type = IRQ_SPECIAL;
}
#if MAX_IPI > 0
m = IRQ_IPI0;
#else
m = IRQ_DBL0;
#endif
for (; i < m; i++) {
opp->src[i].type = IRQ_TIMER;
}
for (; i < MAX_IRQ; i++) {
opp->src[i].type = IRQ_INTERNAL;
}
for (i = 0; i < nb_cpus; i++)
opp->dst[i].irqs = irqs[i];
opp->irq_out = irq_out;
openpic_reset(opp);
if (pmem_index)
*pmem_index = opp->mem_index;
return qemu_allocate_irqs(openpic_set_irq, opp, MAX_IRQ);
}
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