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xemu/hw/esp.c
Blue Swirl 85948643b8 esp: lower IRQ on soft reset 
42f1ced228 removed irq lowering
during reset. However, for chip reset command and DMA reset signal,
its actually the correct thing to do.

Lower IRQ on soft reset only.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-06-10 17:57:39 +00:00

703 lines
19 KiB
C
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/*
* QEMU ESP/NCR53C9x emulation
*
* Copyright (c) 2005-2006 Fabrice Bellard
*
* 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 "sysbus.h"
#include "scsi.h"
#include "esp.h"
/* debug ESP card */
//#define DEBUG_ESP
/*
* On Sparc32, this is the ESP (NCR53C90) part of chip STP2000 (Master I/O),
* also produced as NCR89C100. See
* http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C100.txt
* and
* http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR53C9X.txt
*/
#ifdef DEBUG_ESP
#define DPRINTF(fmt, ...) \
do { printf("ESP: " fmt , ## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) do {} while (0)
#endif
#define ESP_ERROR(fmt, ...) \
do { printf("ESP ERROR: %s: " fmt, __func__ , ## __VA_ARGS__); } while (0)
#define ESP_REGS 16
#define TI_BUFSZ 16
typedef struct ESPState ESPState;
struct ESPState {
SysBusDevice busdev;
uint32_t it_shift;
qemu_irq irq;
uint8_t rregs[ESP_REGS];
uint8_t wregs[ESP_REGS];
int32_t ti_size;
uint32_t ti_rptr, ti_wptr;
uint8_t ti_buf[TI_BUFSZ];
uint32_t sense;
uint32_t dma;
SCSIBus bus;
SCSIDevice *current_dev;
uint8_t cmdbuf[TI_BUFSZ];
uint32_t cmdlen;
uint32_t do_cmd;
/* The amount of data left in the current DMA transfer. */
uint32_t dma_left;
/* The size of the current DMA transfer. Zero if no transfer is in
progress. */
uint32_t dma_counter;
uint8_t *async_buf;
uint32_t async_len;
ESPDMAMemoryReadWriteFunc dma_memory_read;
ESPDMAMemoryReadWriteFunc dma_memory_write;
void *dma_opaque;
};
#define ESP_TCLO 0x0
#define ESP_TCMID 0x1
#define ESP_FIFO 0x2
#define ESP_CMD 0x3
#define ESP_RSTAT 0x4
#define ESP_WBUSID 0x4
#define ESP_RINTR 0x5
#define ESP_WSEL 0x5
#define ESP_RSEQ 0x6
#define ESP_WSYNTP 0x6
#define ESP_RFLAGS 0x7
#define ESP_WSYNO 0x7
#define ESP_CFG1 0x8
#define ESP_RRES1 0x9
#define ESP_WCCF 0x9
#define ESP_RRES2 0xa
#define ESP_WTEST 0xa
#define ESP_CFG2 0xb
#define ESP_CFG3 0xc
#define ESP_RES3 0xd
#define ESP_TCHI 0xe
#define ESP_RES4 0xf
#define CMD_DMA 0x80
#define CMD_CMD 0x7f
#define CMD_NOP 0x00
#define CMD_FLUSH 0x01
#define CMD_RESET 0x02
#define CMD_BUSRESET 0x03
#define CMD_TI 0x10
#define CMD_ICCS 0x11
#define CMD_MSGACC 0x12
#define CMD_PAD 0x18
#define CMD_SATN 0x1a
#define CMD_SEL 0x41
#define CMD_SELATN 0x42
#define CMD_SELATNS 0x43
#define CMD_ENSEL 0x44
#define STAT_DO 0x00
#define STAT_DI 0x01
#define STAT_CD 0x02
#define STAT_ST 0x03
#define STAT_MO 0x06
#define STAT_MI 0x07
#define STAT_PIO_MASK 0x06
#define STAT_TC 0x10
#define STAT_PE 0x20
#define STAT_GE 0x40
#define STAT_INT 0x80
#define BUSID_DID 0x07
#define INTR_FC 0x08
#define INTR_BS 0x10
#define INTR_DC 0x20
#define INTR_RST 0x80
#define SEQ_0 0x0
#define SEQ_CD 0x4
#define CFG1_RESREPT 0x40
#define TCHI_FAS100A 0x4
static void esp_raise_irq(ESPState *s)
{
if (!(s->rregs[ESP_RSTAT] & STAT_INT)) {
s->rregs[ESP_RSTAT] |= STAT_INT;
qemu_irq_raise(s->irq);
DPRINTF("Raise IRQ\n");
}
}
static void esp_lower_irq(ESPState *s)
{
if (s->rregs[ESP_RSTAT] & STAT_INT) {
s->rregs[ESP_RSTAT] &= ~STAT_INT;
qemu_irq_lower(s->irq);
DPRINTF("Lower IRQ\n");
}
}
static uint32_t get_cmd(ESPState *s, uint8_t *buf)
{
uint32_t dmalen;
int target;
target = s->wregs[ESP_WBUSID] & BUSID_DID;
if (s->dma) {
dmalen = s->rregs[ESP_TCLO] | (s->rregs[ESP_TCMID] << 8);
s->dma_memory_read(s->dma_opaque, buf, dmalen);
} else {
dmalen = s->ti_size;
memcpy(buf, s->ti_buf, dmalen);
buf[0] = 0;
}
DPRINTF("get_cmd: len %d target %d\n", dmalen, target);
s->ti_size = 0;
s->ti_rptr = 0;
s->ti_wptr = 0;
if (s->current_dev) {
/* Started a new command before the old one finished. Cancel it. */
s->current_dev->info->cancel_io(s->current_dev, 0);
s->async_len = 0;
}
if (target >= ESP_MAX_DEVS || !s->bus.devs[target]) {
// No such drive
s->rregs[ESP_RSTAT] = 0;
s->rregs[ESP_RINTR] = INTR_DC;
s->rregs[ESP_RSEQ] = SEQ_0;
esp_raise_irq(s);
return 0;
}
s->current_dev = s->bus.devs[target];
return dmalen;
}
static void do_busid_cmd(ESPState *s, uint8_t *buf, uint8_t busid)
{
int32_t datalen;
int lun;
DPRINTF("do_busid_cmd: busid 0x%x\n", busid);
lun = busid & 7;
datalen = s->current_dev->info->send_command(s->current_dev, 0, buf, lun);
s->ti_size = datalen;
if (datalen != 0) {
s->rregs[ESP_RSTAT] = STAT_TC;
s->dma_left = 0;
s->dma_counter = 0;
if (datalen > 0) {
s->rregs[ESP_RSTAT] |= STAT_DI;
s->current_dev->info->read_data(s->current_dev, 0);
} else {
s->rregs[ESP_RSTAT] |= STAT_DO;
s->current_dev->info->write_data(s->current_dev, 0);
}
}
s->rregs[ESP_RINTR] = INTR_BS | INTR_FC;
s->rregs[ESP_RSEQ] = SEQ_CD;
esp_raise_irq(s);
}
static void do_cmd(ESPState *s, uint8_t *buf)
{
uint8_t busid = buf[0];
do_busid_cmd(s, &buf[1], busid);
}
static void handle_satn(ESPState *s)
{
uint8_t buf[32];
int len;
len = get_cmd(s, buf);
if (len)
do_cmd(s, buf);
}
static void handle_s_without_atn(ESPState *s)
{
uint8_t buf[32];
int len;
len = get_cmd(s, buf);
if (len) {
do_busid_cmd(s, buf, 0);
}
}
static void handle_satn_stop(ESPState *s)
{
s->cmdlen = get_cmd(s, s->cmdbuf);
if (s->cmdlen) {
DPRINTF("Set ATN & Stop: cmdlen %d\n", s->cmdlen);
s->do_cmd = 1;
s->rregs[ESP_RSTAT] = STAT_TC | STAT_CD;
s->rregs[ESP_RINTR] = INTR_BS | INTR_FC;
s->rregs[ESP_RSEQ] = SEQ_CD;
esp_raise_irq(s);
}
}
static void write_response(ESPState *s)
{
DPRINTF("Transfer status (sense=%d)\n", s->sense);
s->ti_buf[0] = s->sense;
s->ti_buf[1] = 0;
if (s->dma) {
s->dma_memory_write(s->dma_opaque, s->ti_buf, 2);
s->rregs[ESP_RSTAT] = STAT_TC | STAT_ST;
s->rregs[ESP_RINTR] = INTR_BS | INTR_FC;
s->rregs[ESP_RSEQ] = SEQ_CD;
} else {
s->ti_size = 2;
s->ti_rptr = 0;
s->ti_wptr = 0;
s->rregs[ESP_RFLAGS] = 2;
}
esp_raise_irq(s);
}
static void esp_dma_done(ESPState *s)
{
s->rregs[ESP_RSTAT] |= STAT_TC;
s->rregs[ESP_RINTR] = INTR_BS;
s->rregs[ESP_RSEQ] = 0;
s->rregs[ESP_RFLAGS] = 0;
s->rregs[ESP_TCLO] = 0;
s->rregs[ESP_TCMID] = 0;
esp_raise_irq(s);
}
static void esp_do_dma(ESPState *s)
{
uint32_t len;
int to_device;
to_device = (s->ti_size < 0);
len = s->dma_left;
if (s->do_cmd) {
DPRINTF("command len %d + %d\n", s->cmdlen, len);
s->dma_memory_read(s->dma_opaque, &s->cmdbuf[s->cmdlen], len);
s->ti_size = 0;
s->cmdlen = 0;
s->do_cmd = 0;
do_cmd(s, s->cmdbuf);
return;
}
if (s->async_len == 0) {
/* Defer until data is available. */
return;
}
if (len > s->async_len) {
len = s->async_len;
}
if (to_device) {
s->dma_memory_read(s->dma_opaque, s->async_buf, len);
} else {
s->dma_memory_write(s->dma_opaque, s->async_buf, len);
}
s->dma_left -= len;
s->async_buf += len;
s->async_len -= len;
if (to_device)
s->ti_size += len;
else
s->ti_size -= len;
if (s->async_len == 0) {
if (to_device) {
// ti_size is negative
s->current_dev->info->write_data(s->current_dev, 0);
} else {
s->current_dev->info->read_data(s->current_dev, 0);
/* If there is still data to be read from the device then
complete the DMA operation immediately. Otherwise defer
until the scsi layer has completed. */
if (s->dma_left == 0 && s->ti_size > 0) {
esp_dma_done(s);
}
}
} else {
/* Partially filled a scsi buffer. Complete immediately. */
esp_dma_done(s);
}
}
static void esp_command_complete(SCSIBus *bus, int reason, uint32_t tag,
uint32_t arg)
{
ESPState *s = DO_UPCAST(ESPState, busdev.qdev, bus->qbus.parent);
if (reason == SCSI_REASON_DONE) {
DPRINTF("SCSI Command complete\n");
if (s->ti_size != 0)
DPRINTF("SCSI command completed unexpectedly\n");
s->ti_size = 0;
s->dma_left = 0;
s->async_len = 0;
if (arg)
DPRINTF("Command failed\n");
s->sense = arg;
s->rregs[ESP_RSTAT] = STAT_ST;
esp_dma_done(s);
s->current_dev = NULL;
} else {
DPRINTF("transfer %d/%d\n", s->dma_left, s->ti_size);
s->async_len = arg;
s->async_buf = s->current_dev->info->get_buf(s->current_dev, 0);
if (s->dma_left) {
esp_do_dma(s);
} else if (s->dma_counter != 0 && s->ti_size <= 0) {
/* If this was the last part of a DMA transfer then the
completion interrupt is deferred to here. */
esp_dma_done(s);
}
}
}
static void handle_ti(ESPState *s)
{
uint32_t dmalen, minlen;
dmalen = s->rregs[ESP_TCLO] | (s->rregs[ESP_TCMID] << 8);
if (dmalen==0) {
dmalen=0x10000;
}
s->dma_counter = dmalen;
if (s->do_cmd)
minlen = (dmalen < 32) ? dmalen : 32;
else if (s->ti_size < 0)
minlen = (dmalen < -s->ti_size) ? dmalen : -s->ti_size;
else
minlen = (dmalen < s->ti_size) ? dmalen : s->ti_size;
DPRINTF("Transfer Information len %d\n", minlen);
if (s->dma) {
s->dma_left = minlen;
s->rregs[ESP_RSTAT] &= ~STAT_TC;
esp_do_dma(s);
} else if (s->do_cmd) {
DPRINTF("command len %d\n", s->cmdlen);
s->ti_size = 0;
s->cmdlen = 0;
s->do_cmd = 0;
do_cmd(s, s->cmdbuf);
return;
}
}
static void esp_hard_reset(DeviceState *d)
{
ESPState *s = container_of(d, ESPState, busdev.qdev);
memset(s->rregs, 0, ESP_REGS);
memset(s->wregs, 0, ESP_REGS);
s->rregs[ESP_TCHI] = TCHI_FAS100A; // Indicate fas100a
s->ti_size = 0;
s->ti_rptr = 0;
s->ti_wptr = 0;
s->dma = 0;
s->do_cmd = 0;
s->rregs[ESP_CFG1] = 7;
}
static void esp_soft_reset(DeviceState *d)
{
ESPState *s = container_of(d, ESPState, busdev.qdev);
qemu_irq_lower(s->irq);
esp_hard_reset(d);
}
static void parent_esp_reset(void *opaque, int irq, int level)
{
if (level) {
esp_soft_reset(opaque);
}
}
static uint32_t esp_mem_readb(void *opaque, target_phys_addr_t addr)
{
ESPState *s = opaque;
uint32_t saddr, old_val;
saddr = addr >> s->it_shift;
DPRINTF("read reg[%d]: 0x%2.2x\n", saddr, s->rregs[saddr]);
switch (saddr) {
case ESP_FIFO:
if (s->ti_size > 0) {
s->ti_size--;
if ((s->rregs[ESP_RSTAT] & STAT_PIO_MASK) == 0) {
/* Data out. */
ESP_ERROR("PIO data read not implemented\n");
s->rregs[ESP_FIFO] = 0;
} else {
s->rregs[ESP_FIFO] = s->ti_buf[s->ti_rptr++];
}
esp_raise_irq(s);
}
if (s->ti_size == 0) {
s->ti_rptr = 0;
s->ti_wptr = 0;
}
break;
case ESP_RINTR:
/* Clear sequence step, interrupt register and all status bits
except TC */
old_val = s->rregs[ESP_RINTR];
s->rregs[ESP_RINTR] = 0;
s->rregs[ESP_RSTAT] &= ~STAT_TC;
s->rregs[ESP_RSEQ] = SEQ_CD;
esp_lower_irq(s);
return old_val;
default:
break;
}
return s->rregs[saddr];
}
static void esp_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
{
ESPState *s = opaque;
uint32_t saddr;
saddr = addr >> s->it_shift;
DPRINTF("write reg[%d]: 0x%2.2x -> 0x%2.2x\n", saddr, s->wregs[saddr],
val);
switch (saddr) {
case ESP_TCLO:
case ESP_TCMID:
s->rregs[ESP_RSTAT] &= ~STAT_TC;
break;
case ESP_FIFO:
if (s->do_cmd) {
s->cmdbuf[s->cmdlen++] = val & 0xff;
} else if (s->ti_size == TI_BUFSZ - 1) {
ESP_ERROR("fifo overrun\n");
} else {
s->ti_size++;
s->ti_buf[s->ti_wptr++] = val & 0xff;
}
break;
case ESP_CMD:
s->rregs[saddr] = val;
if (val & CMD_DMA) {
s->dma = 1;
/* Reload DMA counter. */
s->rregs[ESP_TCLO] = s->wregs[ESP_TCLO];
s->rregs[ESP_TCMID] = s->wregs[ESP_TCMID];
} else {
s->dma = 0;
}
switch(val & CMD_CMD) {
case CMD_NOP:
DPRINTF("NOP (%2.2x)\n", val);
break;
case CMD_FLUSH:
DPRINTF("Flush FIFO (%2.2x)\n", val);
//s->ti_size = 0;
s->rregs[ESP_RINTR] = INTR_FC;
s->rregs[ESP_RSEQ] = 0;
s->rregs[ESP_RFLAGS] = 0;
break;
case CMD_RESET:
DPRINTF("Chip reset (%2.2x)\n", val);
esp_soft_reset(&s->busdev.qdev);
break;
case CMD_BUSRESET:
DPRINTF("Bus reset (%2.2x)\n", val);
s->rregs[ESP_RINTR] = INTR_RST;
if (!(s->wregs[ESP_CFG1] & CFG1_RESREPT)) {
esp_raise_irq(s);
}
break;
case CMD_TI:
handle_ti(s);
break;
case CMD_ICCS:
DPRINTF("Initiator Command Complete Sequence (%2.2x)\n", val);
write_response(s);
s->rregs[ESP_RINTR] = INTR_FC;
s->rregs[ESP_RSTAT] |= STAT_MI;
break;
case CMD_MSGACC:
DPRINTF("Message Accepted (%2.2x)\n", val);
s->rregs[ESP_RINTR] = INTR_DC;
s->rregs[ESP_RSEQ] = 0;
s->rregs[ESP_RFLAGS] = 0;
esp_raise_irq(s);
break;
case CMD_PAD:
DPRINTF("Transfer padding (%2.2x)\n", val);
s->rregs[ESP_RSTAT] = STAT_TC;
s->rregs[ESP_RINTR] = INTR_FC;
s->rregs[ESP_RSEQ] = 0;
break;
case CMD_SATN:
DPRINTF("Set ATN (%2.2x)\n", val);
break;
case CMD_SEL:
DPRINTF("Select without ATN (%2.2x)\n", val);
handle_s_without_atn(s);
break;
case CMD_SELATN:
DPRINTF("Select with ATN (%2.2x)\n", val);
handle_satn(s);
break;
case CMD_SELATNS:
DPRINTF("Select with ATN & stop (%2.2x)\n", val);
handle_satn_stop(s);
break;
case CMD_ENSEL:
DPRINTF("Enable selection (%2.2x)\n", val);
s->rregs[ESP_RINTR] = 0;
break;
default:
ESP_ERROR("Unhandled ESP command (%2.2x)\n", val);
break;
}
break;
case ESP_WBUSID ... ESP_WSYNO:
break;
case ESP_CFG1:
s->rregs[saddr] = val;
break;
case ESP_WCCF ... ESP_WTEST:
break;
case ESP_CFG2 ... ESP_RES4:
s->rregs[saddr] = val;
break;
default:
ESP_ERROR("invalid write of 0x%02x at [0x%x]\n", val, saddr);
return;
}
s->wregs[saddr] = val;
}
static CPUReadMemoryFunc * const esp_mem_read[3] = {
esp_mem_readb,
NULL,
NULL,
};
static CPUWriteMemoryFunc * const esp_mem_write[3] = {
esp_mem_writeb,
NULL,
esp_mem_writeb,
};
static const VMStateDescription vmstate_esp = {
.name ="esp",
.version_id = 3,
.minimum_version_id = 3,
.minimum_version_id_old = 3,
.fields = (VMStateField []) {
VMSTATE_BUFFER(rregs, ESPState),
VMSTATE_BUFFER(wregs, ESPState),
VMSTATE_INT32(ti_size, ESPState),
VMSTATE_UINT32(ti_rptr, ESPState),
VMSTATE_UINT32(ti_wptr, ESPState),
VMSTATE_BUFFER(ti_buf, ESPState),
VMSTATE_UINT32(sense, ESPState),
VMSTATE_UINT32(dma, ESPState),
VMSTATE_BUFFER(cmdbuf, ESPState),
VMSTATE_UINT32(cmdlen, ESPState),
VMSTATE_UINT32(do_cmd, ESPState),
VMSTATE_UINT32(dma_left, ESPState),
VMSTATE_END_OF_LIST()
}
};
void esp_init(target_phys_addr_t espaddr, int it_shift,
ESPDMAMemoryReadWriteFunc dma_memory_read,
ESPDMAMemoryReadWriteFunc dma_memory_write,
void *dma_opaque, qemu_irq irq, qemu_irq *reset)
{
DeviceState *dev;
SysBusDevice *s;
ESPState *esp;
dev = qdev_create(NULL, "esp");
esp = DO_UPCAST(ESPState, busdev.qdev, dev);
esp->dma_memory_read = dma_memory_read;
esp->dma_memory_write = dma_memory_write;
esp->dma_opaque = dma_opaque;
esp->it_shift = it_shift;
qdev_init_nofail(dev);
s = sysbus_from_qdev(dev);
sysbus_connect_irq(s, 0, irq);
sysbus_mmio_map(s, 0, espaddr);
*reset = qdev_get_gpio_in(dev, 0);
}
static int esp_init1(SysBusDevice *dev)
{
ESPState *s = FROM_SYSBUS(ESPState, dev);
int esp_io_memory;
sysbus_init_irq(dev, &s->irq);
assert(s->it_shift != -1);
esp_io_memory = cpu_register_io_memory(esp_mem_read, esp_mem_write, s);
sysbus_init_mmio(dev, ESP_REGS << s->it_shift, esp_io_memory);
qdev_init_gpio_in(&dev->qdev, parent_esp_reset, 1);
scsi_bus_new(&s->bus, &dev->qdev, 0, ESP_MAX_DEVS, esp_command_complete);
scsi_bus_legacy_handle_cmdline(&s->bus);
return 0;
}
static SysBusDeviceInfo esp_info = {
.init = esp_init1,
.qdev.name = "esp",
.qdev.size = sizeof(ESPState),
.qdev.vmsd = &vmstate_esp,
.qdev.reset = esp_hard_reset,
.qdev.props = (Property[]) {
{.name = NULL}
}
};
static void esp_register_devices(void)
{
sysbus_register_withprop(&esp_info);
}
device_init(esp_register_devices)
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