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qemu/hw/scsi/esp-pci.c
Mark Cave-Ayland c2d7de557d hw/scsi/esp-pci: set DMA_STAT_BCMBLT when BLAST command issued 
Even though the BLAST command isn't fully implemented in QEMU, the DMA_STAT_BCMBLT
bit should be set after the command has been issued to indicate that the command
has completed.

This fixes an issue with the DC390 DOS driver which issues the BLAST command as
part of its normal error recovery routine at startup, and otherwise sits in a
tight loop waiting for DMA_STAT_BCMBLT to be set before continuing.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Message-ID: <20240112131529.515642-5-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
2024-01-19 12:28:59 +01:00

586 lines
16 KiB
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/*
* QEMU ESP/NCR53C9x emulation
*
* Copyright (c) 2005-2006 Fabrice Bellard
* Copyright (c) 2012 Herve Poussineau
*
* 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 "qemu/osdep.h"
#include "hw/pci/pci_device.h"
#include "hw/irq.h"
#include "hw/nvram/eeprom93xx.h"
#include "hw/scsi/esp.h"
#include "migration/vmstate.h"
#include "trace.h"
#include "qapi/error.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "qom/object.h"
#define TYPE_AM53C974_DEVICE "am53c974"
typedef struct PCIESPState PCIESPState;
DECLARE_INSTANCE_CHECKER(PCIESPState, PCI_ESP,
TYPE_AM53C974_DEVICE)
#define DMA_CMD 0x0
#define DMA_STC 0x1
#define DMA_SPA 0x2
#define DMA_WBC 0x3
#define DMA_WAC 0x4
#define DMA_STAT 0x5
#define DMA_SMDLA 0x6
#define DMA_WMAC 0x7
#define DMA_CMD_MASK 0x03
#define DMA_CMD_DIAG 0x04
#define DMA_CMD_MDL 0x10
#define DMA_CMD_INTE_P 0x20
#define DMA_CMD_INTE_D 0x40
#define DMA_CMD_DIR 0x80
#define DMA_STAT_PWDN 0x01
#define DMA_STAT_ERROR 0x02
#define DMA_STAT_ABORT 0x04
#define DMA_STAT_DONE 0x08
#define DMA_STAT_SCSIINT 0x10
#define DMA_STAT_BCMBLT 0x20
#define SBAC_STATUS (1 << 24)
struct PCIESPState {
/*< private >*/
PCIDevice parent_obj;
/*< public >*/
MemoryRegion io;
uint32_t dma_regs[8];
uint32_t sbac;
ESPState esp;
};
static void esp_pci_update_irq(PCIESPState *pci)
{
int scsi_level = !!(pci->dma_regs[DMA_STAT] & DMA_STAT_SCSIINT);
int dma_level = (pci->dma_regs[DMA_CMD] & DMA_CMD_INTE_D) ?
!!(pci->dma_regs[DMA_STAT] & DMA_STAT_DONE) : 0;
int level = scsi_level || dma_level;
pci_set_irq(PCI_DEVICE(pci), level);
}
static void esp_irq_handler(void *opaque, int irq_num, int level)
{
PCIESPState *pci = PCI_ESP(opaque);
if (level) {
pci->dma_regs[DMA_STAT] |= DMA_STAT_SCSIINT;
/*
* If raising the ESP IRQ to indicate end of DMA transfer, set
* DMA_STAT_DONE at the same time. In theory this should be done in
* esp_pci_dma_memory_rw(), however there is a delay between setting
* DMA_STAT_DONE and the ESP IRQ arriving which is visible to the
* guest that can cause confusion e.g. Linux
*/
if ((pci->dma_regs[DMA_CMD] & DMA_CMD_MASK) == 0x3 &&
pci->dma_regs[DMA_WBC] == 0) {
pci->dma_regs[DMA_STAT] |= DMA_STAT_DONE;
}
} else {
pci->dma_regs[DMA_STAT] &= ~DMA_STAT_SCSIINT;
}
esp_pci_update_irq(pci);
}
static void esp_pci_handle_idle(PCIESPState *pci, uint32_t val)
{
ESPState *s = &pci->esp;
trace_esp_pci_dma_idle(val);
esp_dma_enable(s, 0, 0);
}
static void esp_pci_handle_blast(PCIESPState *pci, uint32_t val)
{
trace_esp_pci_dma_blast(val);
qemu_log_mask(LOG_UNIMP, "am53c974: cmd BLAST not implemented\n");
pci->dma_regs[DMA_STAT] |= DMA_STAT_BCMBLT;
}
static void esp_pci_handle_abort(PCIESPState *pci, uint32_t val)
{
ESPState *s = &pci->esp;
trace_esp_pci_dma_abort(val);
if (s->current_req) {
scsi_req_cancel(s->current_req);
}
}
static void esp_pci_handle_start(PCIESPState *pci, uint32_t val)
{
ESPState *s = &pci->esp;
trace_esp_pci_dma_start(val);
pci->dma_regs[DMA_WBC] = pci->dma_regs[DMA_STC];
pci->dma_regs[DMA_WAC] = pci->dma_regs[DMA_SPA];
pci->dma_regs[DMA_WMAC] = pci->dma_regs[DMA_SMDLA];
pci->dma_regs[DMA_STAT] &= ~(DMA_STAT_BCMBLT | DMA_STAT_SCSIINT
| DMA_STAT_DONE | DMA_STAT_ABORT
| DMA_STAT_ERROR | DMA_STAT_PWDN);
esp_dma_enable(s, 0, 1);
}
static void esp_pci_dma_write(PCIESPState *pci, uint32_t saddr, uint32_t val)
{
trace_esp_pci_dma_write(saddr, pci->dma_regs[saddr], val);
switch (saddr) {
case DMA_CMD:
pci->dma_regs[saddr] = val;
switch (val & DMA_CMD_MASK) {
case 0x0: /* IDLE */
esp_pci_handle_idle(pci, val);
break;
case 0x1: /* BLAST */
esp_pci_handle_blast(pci, val);
break;
case 0x2: /* ABORT */
esp_pci_handle_abort(pci, val);
break;
case 0x3: /* START */
esp_pci_handle_start(pci, val);
break;
default: /* can't happen */
abort();
}
break;
case DMA_STC:
case DMA_SPA:
case DMA_SMDLA:
pci->dma_regs[saddr] = val;
break;
case DMA_STAT:
if (pci->sbac & SBAC_STATUS) {
/* clear some bits on write */
uint32_t mask = DMA_STAT_ERROR | DMA_STAT_ABORT | DMA_STAT_DONE;
pci->dma_regs[DMA_STAT] &= ~(val & mask);
esp_pci_update_irq(pci);
}
break;
default:
trace_esp_pci_error_invalid_write_dma(val, saddr);
return;
}
}
static uint32_t esp_pci_dma_read(PCIESPState *pci, uint32_t saddr)
{
uint32_t val;
val = pci->dma_regs[saddr];
if (saddr == DMA_STAT) {
if (!(pci->sbac & SBAC_STATUS)) {
pci->dma_regs[DMA_STAT] &= ~(DMA_STAT_ERROR | DMA_STAT_ABORT |
DMA_STAT_DONE);
esp_pci_update_irq(pci);
}
}
trace_esp_pci_dma_read(saddr, val);
return val;
}
static void esp_pci_io_write(void *opaque, hwaddr addr,
uint64_t val, unsigned int size)
{
PCIESPState *pci = opaque;
ESPState *s = &pci->esp;
if (size < 4 || addr & 3) {
/* need to upgrade request: we only support 4-bytes accesses */
uint32_t current = 0, mask;
int shift;
if (addr < 0x40) {
current = s->wregs[addr >> 2];
} else if (addr < 0x60) {
current = pci->dma_regs[(addr - 0x40) >> 2];
} else if (addr < 0x74) {
current = pci->sbac;
}
shift = (4 - size) * 8;
mask = (~(uint32_t)0 << shift) >> shift;
shift = ((4 - (addr & 3)) & 3) * 8;
val <<= shift;
val |= current & ~(mask << shift);
addr &= ~3;
size = 4;
}
g_assert(size >= 4);
if (addr < 0x40) {
/* SCSI core reg */
esp_reg_write(s, addr >> 2, val);
} else if (addr < 0x60) {
/* PCI DMA CCB */
esp_pci_dma_write(pci, (addr - 0x40) >> 2, val);
} else if (addr == 0x70) {
/* DMA SCSI Bus and control */
trace_esp_pci_sbac_write(pci->sbac, val);
pci->sbac = val;
} else {
trace_esp_pci_error_invalid_write((int)addr);
}
}
static uint64_t esp_pci_io_read(void *opaque, hwaddr addr,
unsigned int size)
{
PCIESPState *pci = opaque;
ESPState *s = &pci->esp;
uint32_t ret;
if (addr < 0x40) {
/* SCSI core reg */
ret = esp_reg_read(s, addr >> 2);
} else if (addr < 0x60) {
/* PCI DMA CCB */
ret = esp_pci_dma_read(pci, (addr - 0x40) >> 2);
} else if (addr == 0x70) {
/* DMA SCSI Bus and control */
trace_esp_pci_sbac_read(pci->sbac);
ret = pci->sbac;
} else {
/* Invalid region */
trace_esp_pci_error_invalid_read((int)addr);
ret = 0;
}
/* give only requested data */
ret >>= (addr & 3) * 8;
ret &= ~(~(uint64_t)0 << (8 * size));
return ret;
}
static void esp_pci_dma_memory_rw(PCIESPState *pci, uint8_t *buf, int len,
DMADirection dir)
{
dma_addr_t addr;
DMADirection expected_dir;
if (pci->dma_regs[DMA_CMD] & DMA_CMD_DIR) {
expected_dir = DMA_DIRECTION_FROM_DEVICE;
} else {
expected_dir = DMA_DIRECTION_TO_DEVICE;
}
if (dir != expected_dir) {
trace_esp_pci_error_invalid_dma_direction();
return;
}
if (pci->dma_regs[DMA_STAT] & DMA_CMD_MDL) {
qemu_log_mask(LOG_UNIMP, "am53c974: MDL transfer not implemented\n");
}
addr = pci->dma_regs[DMA_WAC];
if (pci->dma_regs[DMA_WBC] < len) {
len = pci->dma_regs[DMA_WBC];
}
pci_dma_rw(PCI_DEVICE(pci), addr, buf, len, dir, MEMTXATTRS_UNSPECIFIED);
/* update status registers */
pci->dma_regs[DMA_WBC] -= len;
pci->dma_regs[DMA_WAC] += len;
}
static void esp_pci_dma_memory_read(void *opaque, uint8_t *buf, int len)
{
PCIESPState *pci = opaque;
esp_pci_dma_memory_rw(pci, buf, len, DMA_DIRECTION_TO_DEVICE);
}
static void esp_pci_dma_memory_write(void *opaque, uint8_t *buf, int len)
{
PCIESPState *pci = opaque;
esp_pci_dma_memory_rw(pci, buf, len, DMA_DIRECTION_FROM_DEVICE);
}
static const MemoryRegionOps esp_pci_io_ops = {
.read = esp_pci_io_read,
.write = esp_pci_io_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.impl = {
.min_access_size = 1,
.max_access_size = 4,
},
};
static void esp_pci_hard_reset(DeviceState *dev)
{
PCIESPState *pci = PCI_ESP(dev);
ESPState *s = &pci->esp;
esp_hard_reset(s);
pci->dma_regs[DMA_CMD] &= ~(DMA_CMD_DIR | DMA_CMD_INTE_D | DMA_CMD_INTE_P
| DMA_CMD_MDL | DMA_CMD_DIAG | DMA_CMD_MASK);
pci->dma_regs[DMA_WBC] &= ~0xffff;
pci->dma_regs[DMA_WAC] = 0xffffffff;
pci->dma_regs[DMA_STAT] &= ~(DMA_STAT_BCMBLT | DMA_STAT_SCSIINT
| DMA_STAT_DONE | DMA_STAT_ABORT
| DMA_STAT_ERROR);
pci->dma_regs[DMA_WMAC] = 0xfffffffd;
}
static const VMStateDescription vmstate_esp_pci_scsi = {
.name = "pciespscsi",
.version_id = 2,
.minimum_version_id = 1,
.pre_save = esp_pre_save,
.fields = (const VMStateField[]) {
VMSTATE_PCI_DEVICE(parent_obj, PCIESPState),
VMSTATE_BUFFER_UNSAFE(dma_regs, PCIESPState, 0, 8 * sizeof(uint32_t)),
VMSTATE_UINT8_V(esp.mig_version_id, PCIESPState, 2),
VMSTATE_STRUCT(esp, PCIESPState, 0, vmstate_esp, ESPState),
VMSTATE_END_OF_LIST()
}
};
static const struct SCSIBusInfo esp_pci_scsi_info = {
.tcq = false,
.max_target = ESP_MAX_DEVS,
.max_lun = 7,
.transfer_data = esp_transfer_data,
.complete = esp_command_complete,
.cancel = esp_request_cancelled,
};
static void esp_pci_scsi_realize(PCIDevice *dev, Error **errp)
{
PCIESPState *pci = PCI_ESP(dev);
DeviceState *d = DEVICE(dev);
ESPState *s = &pci->esp;
uint8_t *pci_conf;
if (!qdev_realize(DEVICE(s), NULL, errp)) {
return;
}
pci_conf = dev->config;
/* Interrupt pin A */
pci_conf[PCI_INTERRUPT_PIN] = 0x01;
s->dma_memory_read = esp_pci_dma_memory_read;
s->dma_memory_write = esp_pci_dma_memory_write;
s->dma_opaque = pci;
s->chip_id = TCHI_AM53C974;
memory_region_init_io(&pci->io, OBJECT(pci), &esp_pci_io_ops, pci,
"esp-io", 0x80);
pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_IO, &pci->io);
s->irq = qemu_allocate_irq(esp_irq_handler, pci, 0);
scsi_bus_init(&s->bus, sizeof(s->bus), d, &esp_pci_scsi_info);
}
static void esp_pci_scsi_exit(PCIDevice *d)
{
PCIESPState *pci = PCI_ESP(d);
ESPState *s = &pci->esp;
qemu_free_irq(s->irq);
}
static void esp_pci_init(Object *obj)
{
PCIESPState *pci = PCI_ESP(obj);
object_initialize_child(obj, "esp", &pci->esp, TYPE_ESP);
}
static void esp_pci_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
k->realize = esp_pci_scsi_realize;
k->exit = esp_pci_scsi_exit;
k->vendor_id = PCI_VENDOR_ID_AMD;
k->device_id = PCI_DEVICE_ID_AMD_SCSI;
k->revision = 0x10;
k->class_id = PCI_CLASS_STORAGE_SCSI;
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
dc->desc = "AMD Am53c974 PCscsi-PCI SCSI adapter";
dc->reset = esp_pci_hard_reset;
dc->vmsd = &vmstate_esp_pci_scsi;
}
static const TypeInfo esp_pci_info = {
.name = TYPE_AM53C974_DEVICE,
.parent = TYPE_PCI_DEVICE,
.instance_init = esp_pci_init,
.instance_size = sizeof(PCIESPState),
.class_init = esp_pci_class_init,
.interfaces = (InterfaceInfo[]) {
{ INTERFACE_CONVENTIONAL_PCI_DEVICE },
{ },
},
};
struct DC390State {
PCIESPState pci;
eeprom_t *eeprom;
};
typedef struct DC390State DC390State;
#define TYPE_DC390_DEVICE "dc390"
DECLARE_INSTANCE_CHECKER(DC390State, DC390,
TYPE_DC390_DEVICE)
#define EE_ADAPT_SCSI_ID 64
#define EE_MODE2 65
#define EE_DELAY 66
#define EE_TAG_CMD_NUM 67
#define EE_ADAPT_OPTIONS 68
#define EE_BOOT_SCSI_ID 69
#define EE_BOOT_SCSI_LUN 70
#define EE_CHKSUM1 126
#define EE_CHKSUM2 127
#define EE_ADAPT_OPTION_F6_F8_AT_BOOT 0x01
#define EE_ADAPT_OPTION_BOOT_FROM_CDROM 0x02
#define EE_ADAPT_OPTION_INT13 0x04
#define EE_ADAPT_OPTION_SCAM_SUPPORT 0x08
static uint32_t dc390_read_config(PCIDevice *dev, uint32_t addr, int l)
{
DC390State *pci = DC390(dev);
uint32_t val;
val = pci_default_read_config(dev, addr, l);
if (addr == 0x00 && l == 1) {
/* First byte of address space is AND-ed with EEPROM DO line */
if (!eeprom93xx_read(pci->eeprom)) {
val &= ~0xff;
}
}
return val;
}
static void dc390_write_config(PCIDevice *dev,
uint32_t addr, uint32_t val, int l)
{
DC390State *pci = DC390(dev);
if (addr == 0x80) {
/* EEPROM write */
int eesk = val & 0x80 ? 1 : 0;
int eedi = val & 0x40 ? 1 : 0;
eeprom93xx_write(pci->eeprom, 1, eesk, eedi);
} else if (addr == 0xc0) {
/* EEPROM CS low */
eeprom93xx_write(pci->eeprom, 0, 0, 0);
} else {
pci_default_write_config(dev, addr, val, l);
}
}
static void dc390_scsi_realize(PCIDevice *dev, Error **errp)
{
DC390State *pci = DC390(dev);
Error *err = NULL;
uint8_t *contents;
uint16_t chksum = 0;
int i;
/* init base class */
esp_pci_scsi_realize(dev, &err);
if (err) {
error_propagate(errp, err);
return;
}
/* EEPROM */
pci->eeprom = eeprom93xx_new(DEVICE(dev), 64);
/* set default eeprom values */
contents = (uint8_t *)eeprom93xx_data(pci->eeprom);
for (i = 0; i < 16; i++) {
contents[i * 2] = 0x57;
contents[i * 2 + 1] = 0x00;
}
contents[EE_ADAPT_SCSI_ID] = 7;
contents[EE_MODE2] = 0x0f;
contents[EE_TAG_CMD_NUM] = 0x04;
contents[EE_ADAPT_OPTIONS] = EE_ADAPT_OPTION_F6_F8_AT_BOOT
| EE_ADAPT_OPTION_BOOT_FROM_CDROM
| EE_ADAPT_OPTION_INT13;
/* update eeprom checksum */
for (i = 0; i < EE_CHKSUM1; i += 2) {
chksum += contents[i] + (((uint16_t)contents[i + 1]) << 8);
}
chksum = 0x1234 - chksum;
contents[EE_CHKSUM1] = chksum & 0xff;
contents[EE_CHKSUM2] = chksum >> 8;
}
static void dc390_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
k->realize = dc390_scsi_realize;
k->config_read = dc390_read_config;
k->config_write = dc390_write_config;
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
dc->desc = "Tekram DC-390 SCSI adapter";
}
static const TypeInfo dc390_info = {
.name = TYPE_DC390_DEVICE,
.parent = TYPE_AM53C974_DEVICE,
.instance_size = sizeof(DC390State),
.class_init = dc390_class_init,
};
static void esp_pci_register_types(void)
{
type_register_static(&esp_pci_info);
type_register_static(&dc390_info);
}
type_init(esp_pci_register_types)
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