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qemu-irix/hw/misc/macio/mac_dbdma.c

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/*
* PowerMac descriptor-based DMA emulation
*
* Copyright (c) 2005-2007 Fabrice Bellard
* Copyright (c) 2007 Jocelyn Mayer
* Copyright (c) 2009 Laurent Vivier
*
* some parts from linux-2.6.28, arch/powerpc/include/asm/dbdma.h
*
* Definitions for using the Apple Descriptor-Based DMA controller
* in Power Macintosh computers.
*
* Copyright (C) 1996 Paul Mackerras.
*
* some parts from mol 0.9.71
*
* Descriptor based DMA emulation
*
* Copyright (C) 1998-2004 Samuel Rydh (samuel@ibrium.se)
*
* 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.
*/
#include "hw/hw.h"
#include "hw/isa/isa.h"
#include "hw/ppc/mac_dbdma.h"
#include "qemu/main-loop.h"
/* debug DBDMA */
//#define DEBUG_DBDMA
#ifdef DEBUG_DBDMA
#define DBDMA_DPRINTF(fmt, ...) \
do { printf("DBDMA: " fmt , ## __VA_ARGS__); } while (0)
#else
#define DBDMA_DPRINTF(fmt, ...)
#endif
/*
*/
static DBDMAState *dbdma_from_ch(DBDMA_channel *ch)
{
return container_of(ch, DBDMAState, channels[ch->channel]);
}
#ifdef DEBUG_DBDMA
static void dump_dbdma_cmd(dbdma_cmd *cmd)
{
printf("dbdma_cmd %p\n", cmd);
printf(" req_count 0x%04x\n", le16_to_cpu(cmd->req_count));
printf(" command 0x%04x\n", le16_to_cpu(cmd->command));
printf(" phy_addr 0x%08x\n", le32_to_cpu(cmd->phy_addr));
printf(" cmd_dep 0x%08x\n", le32_to_cpu(cmd->cmd_dep));
printf(" res_count 0x%04x\n", le16_to_cpu(cmd->res_count));
printf(" xfer_status 0x%04x\n", le16_to_cpu(cmd->xfer_status));
}
#else
static void dump_dbdma_cmd(dbdma_cmd *cmd)
{
}
#endif
static void dbdma_cmdptr_load(DBDMA_channel *ch)
{
DBDMA_DPRINTF("dbdma_cmdptr_load 0x%08x\n",
ch->regs[DBDMA_CMDPTR_LO]);
cpu_physical_memory_read(ch->regs[DBDMA_CMDPTR_LO],
&ch->current, sizeof(dbdma_cmd));
}
static void dbdma_cmdptr_save(DBDMA_channel *ch)
{
DBDMA_DPRINTF("dbdma_cmdptr_save 0x%08x\n",
ch->regs[DBDMA_CMDPTR_LO]);
DBDMA_DPRINTF("xfer_status 0x%08x res_count 0x%04x\n",
le16_to_cpu(ch->current.xfer_status),
le16_to_cpu(ch->current.res_count));
cpu_physical_memory_write(ch->regs[DBDMA_CMDPTR_LO],
&ch->current, sizeof(dbdma_cmd));
}
static void kill_channel(DBDMA_channel *ch)
{
DBDMA_DPRINTF("kill_channel\n");
ch->regs[DBDMA_STATUS] |= DEAD;
ch->regs[DBDMA_STATUS] &= ~ACTIVE;
qemu_irq_raise(ch->irq);
}
static void conditional_interrupt(DBDMA_channel *ch)
{
dbdma_cmd *current = &ch->current;
uint16_t intr;
uint16_t sel_mask, sel_value;
uint32_t status;
int cond;
DBDMA_DPRINTF("%s\n", __func__);
intr = le16_to_cpu(current->command) & INTR_MASK;
switch(intr) {
case INTR_NEVER: /* don't interrupt */
return;
case INTR_ALWAYS: /* always interrupt */
qemu_irq_raise(ch->irq);
DBDMA_DPRINTF("%s: raise\n", __func__);
return;
}
status = ch->regs[DBDMA_STATUS] & DEVSTAT;
sel_mask = (ch->regs[DBDMA_INTR_SEL] >> 16) & 0x0f;
sel_value = ch->regs[DBDMA_INTR_SEL] & 0x0f;
cond = (status & sel_mask) == (sel_value & sel_mask);
switch(intr) {
case INTR_IFSET: /* intr if condition bit is 1 */
if (cond) {
qemu_irq_raise(ch->irq);
DBDMA_DPRINTF("%s: raise\n", __func__);
}
return;
case INTR_IFCLR: /* intr if condition bit is 0 */
if (!cond) {
qemu_irq_raise(ch->irq);
DBDMA_DPRINTF("%s: raise\n", __func__);
}
return;
}
}
static int conditional_wait(DBDMA_channel *ch)
{
dbdma_cmd *current = &ch->current;
uint16_t wait;
uint16_t sel_mask, sel_value;
uint32_t status;
int cond;
DBDMA_DPRINTF("conditional_wait\n");
wait = le16_to_cpu(current->command) & WAIT_MASK;
switch(wait) {
case WAIT_NEVER: /* don't wait */
return 0;
case WAIT_ALWAYS: /* always wait */
return 1;
}
status = ch->regs[DBDMA_STATUS] & DEVSTAT;
sel_mask = (ch->regs[DBDMA_WAIT_SEL] >> 16) & 0x0f;
sel_value = ch->regs[DBDMA_WAIT_SEL] & 0x0f;
cond = (status & sel_mask) == (sel_value & sel_mask);
switch(wait) {
case WAIT_IFSET: /* wait if condition bit is 1 */
if (cond)
return 1;
return 0;
case WAIT_IFCLR: /* wait if condition bit is 0 */
if (!cond)
return 1;
return 0;
}
return 0;
}
static void next(DBDMA_channel *ch)
{
uint32_t cp;
ch->regs[DBDMA_STATUS] &= ~BT;
cp = ch->regs[DBDMA_CMDPTR_LO];
ch->regs[DBDMA_CMDPTR_LO] = cp + sizeof(dbdma_cmd);
dbdma_cmdptr_load(ch);
}
static void branch(DBDMA_channel *ch)
{
dbdma_cmd *current = &ch->current;
ch->regs[DBDMA_CMDPTR_LO] = current->cmd_dep;
ch->regs[DBDMA_STATUS] |= BT;
dbdma_cmdptr_load(ch);
}
static void conditional_branch(DBDMA_channel *ch)
{
dbdma_cmd *current = &ch->current;
uint16_t br;
uint16_t sel_mask, sel_value;
uint32_t status;
int cond;
DBDMA_DPRINTF("conditional_branch\n");
/* check if we must branch */
br = le16_to_cpu(current->command) & BR_MASK;
switch(br) {
case BR_NEVER: /* don't branch */
next(ch);
return;
case BR_ALWAYS: /* always branch */
branch(ch);
return;
}
status = ch->regs[DBDMA_STATUS] & DEVSTAT;
sel_mask = (ch->regs[DBDMA_BRANCH_SEL] >> 16) & 0x0f;
sel_value = ch->regs[DBDMA_BRANCH_SEL] & 0x0f;
cond = (status & sel_mask) == (sel_value & sel_mask);
switch(br) {
case BR_IFSET: /* branch if condition bit is 1 */
if (cond)
branch(ch);
else
next(ch);
return;
case BR_IFCLR: /* branch if condition bit is 0 */
if (!cond)
branch(ch);
else
next(ch);
return;
}
}
static void channel_run(DBDMA_channel *ch);
static void dbdma_end(DBDMA_io *io)
{
DBDMA_channel *ch = io->channel;
dbdma_cmd *current = &ch->current;
DBDMA_DPRINTF("%s\n", __func__);
if (conditional_wait(ch))
goto wait;
current->xfer_status = cpu_to_le16(ch->regs[DBDMA_STATUS]);
current->res_count = cpu_to_le16(io->len);
dbdma_cmdptr_save(ch);
if (io->is_last)
ch->regs[DBDMA_STATUS] &= ~FLUSH;
conditional_interrupt(ch);
conditional_branch(ch);
wait:
/* Indicate that we're ready for a new DMA round */
ch->io.processing = false;
if ((ch->regs[DBDMA_STATUS] & RUN) &&
(ch->regs[DBDMA_STATUS] & ACTIVE))
channel_run(ch);
}
static void start_output(DBDMA_channel *ch, int key, uint32_t addr,
uint16_t req_count, int is_last)
{
DBDMA_DPRINTF("start_output\n");
/* KEY_REGS, KEY_DEVICE and KEY_STREAM
* are not implemented in the mac-io chip
*/
DBDMA_DPRINTF("addr 0x%x key 0x%x\n", addr, key);
if (!addr || key > KEY_STREAM3) {
kill_channel(ch);
return;
}
ch->io.addr = addr;
ch->io.len = req_count;
ch->io.is_last = is_last;
ch->io.dma_end = dbdma_end;
ch->io.is_dma_out = 1;
ch->io.processing = true;
if (ch->rw) {
ch->rw(&ch->io);
}
}
static void start_input(DBDMA_channel *ch, int key, uint32_t addr,
uint16_t req_count, int is_last)
{
DBDMA_DPRINTF("start_input\n");
/* KEY_REGS, KEY_DEVICE and KEY_STREAM
* are not implemented in the mac-io chip
*/
DBDMA_DPRINTF("addr 0x%x key 0x%x\n", addr, key);
if (!addr || key > KEY_STREAM3) {
kill_channel(ch);
return;
}
ch->io.addr = addr;
ch->io.len = req_count;
ch->io.is_last = is_last;
ch->io.dma_end = dbdma_end;
ch->io.is_dma_out = 0;
ch->io.processing = true;
if (ch->rw) {
ch->rw(&ch->io);
}
}
static void load_word(DBDMA_channel *ch, int key, uint32_t addr,
uint16_t len)
{
dbdma_cmd *current = &ch->current;
uint32_t val;
DBDMA_DPRINTF("load_word\n");
/* only implements KEY_SYSTEM */
if (key != KEY_SYSTEM) {
printf("DBDMA: LOAD_WORD, unimplemented key %x\n", key);
kill_channel(ch);
return;
}
cpu_physical_memory_read(addr, &val, len);
if (len == 2)
val = (val << 16) | (current->cmd_dep & 0x0000ffff);
else if (len == 1)
val = (val << 24) | (current->cmd_dep & 0x00ffffff);
current->cmd_dep = val;
if (conditional_wait(ch))
goto wait;
current->xfer_status = cpu_to_le16(ch->regs[DBDMA_STATUS]);
dbdma_cmdptr_save(ch);
ch->regs[DBDMA_STATUS] &= ~FLUSH;
conditional_interrupt(ch);
next(ch);
wait:
DBDMA_kick(dbdma_from_ch(ch));
}
static void store_word(DBDMA_channel *ch, int key, uint32_t addr,
uint16_t len)
{
dbdma_cmd *current = &ch->current;
uint32_t val;
DBDMA_DPRINTF("store_word\n");
/* only implements KEY_SYSTEM */
if (key != KEY_SYSTEM) {
printf("DBDMA: STORE_WORD, unimplemented key %x\n", key);
kill_channel(ch);
return;
}
val = current->cmd_dep;
if (len == 2)
val >>= 16;
else if (len == 1)
val >>= 24;
cpu_physical_memory_write(addr, &val, len);
if (conditional_wait(ch))
goto wait;
current->xfer_status = cpu_to_le16(ch->regs[DBDMA_STATUS]);
dbdma_cmdptr_save(ch);
ch->regs[DBDMA_STATUS] &= ~FLUSH;
conditional_interrupt(ch);
next(ch);
wait:
DBDMA_kick(dbdma_from_ch(ch));
}
static void nop(DBDMA_channel *ch)
{
dbdma_cmd *current = &ch->current;
if (conditional_wait(ch))
goto wait;
current->xfer_status = cpu_to_le16(ch->regs[DBDMA_STATUS]);
dbdma_cmdptr_save(ch);
conditional_interrupt(ch);
conditional_branch(ch);
wait:
DBDMA_kick(dbdma_from_ch(ch));
}
static void stop(DBDMA_channel *ch)
{
ch->regs[DBDMA_STATUS] &= ~(ACTIVE|DEAD|FLUSH);
/* the stop command does not increment command pointer */
}
static void channel_run(DBDMA_channel *ch)
{
dbdma_cmd *current = &ch->current;
uint16_t cmd, key;
uint16_t req_count;
uint32_t phy_addr;
DBDMA_DPRINTF("channel_run\n");
dump_dbdma_cmd(current);
/* clear WAKE flag at command fetch */
ch->regs[DBDMA_STATUS] &= ~WAKE;
cmd = le16_to_cpu(current->command) & COMMAND_MASK;
switch (cmd) {
case DBDMA_NOP:
nop(ch);
return;
case DBDMA_STOP:
stop(ch);
return;
}
key = le16_to_cpu(current->command) & 0x0700;
req_count = le16_to_cpu(current->req_count);
phy_addr = le32_to_cpu(current->phy_addr);
if (key == KEY_STREAM4) {
printf("command %x, invalid key 4\n", cmd);
kill_channel(ch);
return;
}
switch (cmd) {
case OUTPUT_MORE:
start_output(ch, key, phy_addr, req_count, 0);
return;
case OUTPUT_LAST:
start_output(ch, key, phy_addr, req_count, 1);
return;
case INPUT_MORE:
start_input(ch, key, phy_addr, req_count, 0);
return;
case INPUT_LAST:
start_input(ch, key, phy_addr, req_count, 1);
return;
}
if (key < KEY_REGS) {
printf("command %x, invalid key %x\n", cmd, key);
key = KEY_SYSTEM;
}
/* for LOAD_WORD and STORE_WORD, req_count is on 3 bits
* and BRANCH is invalid
*/
req_count = req_count & 0x0007;
if (req_count & 0x4) {
req_count = 4;
phy_addr &= ~3;
} else if (req_count & 0x2) {
req_count = 2;
phy_addr &= ~1;
} else
req_count = 1;
switch (cmd) {
case LOAD_WORD:
load_word(ch, key, phy_addr, req_count);
return;
case STORE_WORD:
store_word(ch, key, phy_addr, req_count);
return;
}
}
static void DBDMA_run(DBDMAState *s)
{
int channel;
for (channel = 0; channel < DBDMA_CHANNELS; channel++) {
DBDMA_channel *ch = &s->channels[channel];
uint32_t status = ch->regs[DBDMA_STATUS];
if (!ch->io.processing && (status & RUN) && (status & ACTIVE)) {
channel_run(ch);
}
}
}
static void DBDMA_run_bh(void *opaque)
{
DBDMAState *s = opaque;
DBDMA_DPRINTF("DBDMA_run_bh\n");
DBDMA_run(s);
}
void DBDMA_kick(DBDMAState *dbdma)
{
qemu_bh_schedule(dbdma->bh);
}
void DBDMA_register_channel(void *dbdma, int nchan, qemu_irq irq,
DBDMA_rw rw, DBDMA_flush flush,
void *opaque)
{
DBDMAState *s = dbdma;
DBDMA_channel *ch = &s->channels[nchan];
DBDMA_DPRINTF("DBDMA_register_channel 0x%x\n", nchan);
ch->irq = irq;
ch->channel = nchan;
ch->rw = rw;
ch->flush = flush;
ch->io.opaque = opaque;
ch->io.channel = ch;
}
static void
dbdma_control_write(DBDMA_channel *ch)
{
uint16_t mask, value;
uint32_t status;
mask = (ch->regs[DBDMA_CONTROL] >> 16) & 0xffff;
value = ch->regs[DBDMA_CONTROL] & 0xffff;
value &= (RUN | PAUSE | FLUSH | WAKE | DEVSTAT);
status = ch->regs[DBDMA_STATUS];
status = (value & mask) | (status & ~mask);
if (status & WAKE)
status |= ACTIVE;
if (status & RUN) {
status |= ACTIVE;
status &= ~DEAD;
}
if (status & PAUSE)
status &= ~ACTIVE;
if ((ch->regs[DBDMA_STATUS] & RUN) && !(status & RUN)) {
/* RUN is cleared */
status &= ~(ACTIVE|DEAD);
}
if ((status & FLUSH) && ch->flush) {
ch->flush(&ch->io);
status &= ~FLUSH;
}
DBDMA_DPRINTF(" status 0x%08x\n", status);
ch->regs[DBDMA_STATUS] = status;
if (status & ACTIVE) {
DBDMA_kick(dbdma_from_ch(ch));
}
}
static void dbdma_write(void *opaque, hwaddr addr,
uint64_t value, unsigned size)
{
int channel = addr >> DBDMA_CHANNEL_SHIFT;
DBDMAState *s = opaque;
DBDMA_channel *ch = &s->channels[channel];
int reg = (addr - (channel << DBDMA_CHANNEL_SHIFT)) >> 2;
DBDMA_DPRINTF("writel 0x" TARGET_FMT_plx " <= 0x%08"PRIx64"\n",
addr, value);
DBDMA_DPRINTF("channel 0x%x reg 0x%x\n",
(uint32_t)addr >> DBDMA_CHANNEL_SHIFT, reg);
/* cmdptr cannot be modified if channel is ACTIVE */
if (reg == DBDMA_CMDPTR_LO && (ch->regs[DBDMA_STATUS] & ACTIVE)) {
return;
}
ch->regs[reg] = value;
switch(reg) {
case DBDMA_CONTROL:
dbdma_control_write(ch);
break;
case DBDMA_CMDPTR_LO:
/* 16-byte aligned */
ch->regs[DBDMA_CMDPTR_LO] &= ~0xf;
dbdma_cmdptr_load(ch);
break;
case DBDMA_STATUS:
case DBDMA_INTR_SEL:
case DBDMA_BRANCH_SEL:
case DBDMA_WAIT_SEL:
/* nothing to do */
break;
case DBDMA_XFER_MODE:
case DBDMA_CMDPTR_HI:
case DBDMA_DATA2PTR_HI:
case DBDMA_DATA2PTR_LO:
case DBDMA_ADDRESS_HI:
case DBDMA_BRANCH_ADDR_HI:
case DBDMA_RES1:
case DBDMA_RES2:
case DBDMA_RES3:
case DBDMA_RES4:
/* unused */
break;
}
}
static uint64_t dbdma_read(void *opaque, hwaddr addr,
unsigned size)
{
uint32_t value;
int channel = addr >> DBDMA_CHANNEL_SHIFT;
DBDMAState *s = opaque;
DBDMA_channel *ch = &s->channels[channel];
int reg = (addr - (channel << DBDMA_CHANNEL_SHIFT)) >> 2;
value = ch->regs[reg];
DBDMA_DPRINTF("readl 0x" TARGET_FMT_plx " => 0x%08x\n", addr, value);
DBDMA_DPRINTF("channel 0x%x reg 0x%x\n",
(uint32_t)addr >> DBDMA_CHANNEL_SHIFT, reg);
switch(reg) {
case DBDMA_CONTROL:
value = 0;
break;
case DBDMA_STATUS:
case DBDMA_CMDPTR_LO:
case DBDMA_INTR_SEL:
case DBDMA_BRANCH_SEL:
case DBDMA_WAIT_SEL:
/* nothing to do */
break;
case DBDMA_XFER_MODE:
case DBDMA_CMDPTR_HI:
case DBDMA_DATA2PTR_HI:
case DBDMA_DATA2PTR_LO:
case DBDMA_ADDRESS_HI:
case DBDMA_BRANCH_ADDR_HI:
/* unused */
value = 0;
break;
case DBDMA_RES1:
case DBDMA_RES2:
case DBDMA_RES3:
case DBDMA_RES4:
/* reserved */
break;
}
return value;
}
static const MemoryRegionOps dbdma_ops = {
.read = dbdma_read,
.write = dbdma_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.valid = {
.min_access_size = 4,
.max_access_size = 4,
},
};
static const VMStateDescription vmstate_dbdma_channel = {
.name = "dbdma_channel",
.version_id = 0,
.minimum_version_id = 0,
.fields = (VMStateField[]) {
VMSTATE_UINT32_ARRAY(regs, struct DBDMA_channel, DBDMA_REGS),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_dbdma = {
.name = "dbdma",
.version_id = 2,
.minimum_version_id = 2,
.fields = (VMStateField[]) {
VMSTATE_STRUCT_ARRAY(channels, DBDMAState, DBDMA_CHANNELS, 1,
vmstate_dbdma_channel, DBDMA_channel),
VMSTATE_END_OF_LIST()
}
};
static void dbdma_reset(void *opaque)
{
DBDMAState *s = opaque;
int i;
for (i = 0; i < DBDMA_CHANNELS; i++)
memset(s->channels[i].regs, 0, DBDMA_SIZE);
}
void* DBDMA_init (MemoryRegion **dbdma_mem)
{
DBDMAState *s;
int i;
s = g_malloc0(sizeof(DBDMAState));
for (i = 0; i < DBDMA_CHANNELS; i++) {
DBDMA_io *io = &s->channels[i].io;
qemu_iovec_init(&io->iov, 1);
}
memory_region_init_io(&s->mem, NULL, &dbdma_ops, s, "dbdma", 0x1000);
*dbdma_mem = &s->mem;
vmstate_register(NULL, -1, &vmstate_dbdma, s);
qemu_register_reset(dbdma_reset, s);
s->bh = qemu_bh_new(DBDMA_run_bh, s);
return s;
}
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