diff options
Diffstat (limited to 'src/hw/scsi/esp.c')
| -rw-r--r-- | src/hw/scsi/esp.c | 743 |
1 files changed, 743 insertions, 0 deletions
diff --git a/src/hw/scsi/esp.c b/src/hw/scsi/esp.c new file mode 100644 index 0000000..272d13d --- /dev/null +++ b/src/hw/scsi/esp.c @@ -0,0 +1,743 @@ +/* + * 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 "hw/sysbus.h" +#include "hw/scsi/esp.h" +#include "trace.h" +#include "qemu/log.h" + +/* + * 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 + */ + +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); + trace_esp_raise_irq(); + } +} + +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); + trace_esp_lower_irq(); + } +} + +void esp_dma_enable(ESPState *s, int irq, int level) +{ + if (level) { + s->dma_enabled = 1; + trace_esp_dma_enable(); + if (s->dma_cb) { + s->dma_cb(s); + s->dma_cb = NULL; + } + } else { + trace_esp_dma_disable(); + s->dma_enabled = 0; + } +} + +void esp_request_cancelled(SCSIRequest *req) +{ + ESPState *s = req->hba_private; + + if (req == s->current_req) { + scsi_req_unref(s->current_req); + s->current_req = NULL; + s->current_dev = NULL; + } +} + +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]; + dmalen |= s->rregs[ESP_TCMID] << 8; + dmalen |= s->rregs[ESP_TCHI] << 16; + s->dma_memory_read(s->dma_opaque, buf, dmalen); + } else { + dmalen = s->ti_size; + memcpy(buf, s->ti_buf, dmalen); + buf[0] = buf[2] >> 5; + } + trace_esp_get_cmd(dmalen, target); + + s->ti_size = 0; + s->ti_rptr = 0; + s->ti_wptr = 0; + + if (s->current_req) { + /* Started a new command before the old one finished. Cancel it. */ + scsi_req_cancel(s->current_req); + s->async_len = 0; + } + + s->current_dev = scsi_device_find(&s->bus, 0, target, 0); + if (!s->current_dev) { + // 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; + } + return dmalen; +} + +static void do_busid_cmd(ESPState *s, uint8_t *buf, uint8_t busid) +{ + int32_t datalen; + int lun; + SCSIDevice *current_lun; + + trace_esp_do_busid_cmd(busid); + lun = busid & 7; + current_lun = scsi_device_find(&s->bus, 0, s->current_dev->id, lun); + s->current_req = scsi_req_new(current_lun, 0, lun, buf, s); + datalen = scsi_req_enqueue(s->current_req); + 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; + } else { + s->rregs[ESP_RSTAT] |= STAT_DO; + } + scsi_req_continue(s->current_req); + } + 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; + + if (s->dma && !s->dma_enabled) { + s->dma_cb = handle_satn; + return; + } + 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; + + if (s->dma && !s->dma_enabled) { + s->dma_cb = handle_s_without_atn; + return; + } + len = get_cmd(s, buf); + if (len) { + do_busid_cmd(s, buf, 0); + } +} + +static void handle_satn_stop(ESPState *s) +{ + if (s->dma && !s->dma_enabled) { + s->dma_cb = handle_satn_stop; + return; + } + s->cmdlen = get_cmd(s, s->cmdbuf); + if (s->cmdlen) { + trace_esp_handle_satn_stop(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) +{ + trace_esp_write_response(s->status); + s->ti_buf[0] = s->status; + 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; + s->rregs[ESP_TCHI] = 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) { + trace_esp_do_dma(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) { + scsi_req_continue(s->current_req); + /* 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 (to_device || s->dma_left != 0 || s->ti_size == 0) { + return; + } + } + + /* Partially filled a scsi buffer. Complete immediately. */ + esp_dma_done(s); +} + +void esp_command_complete(SCSIRequest *req, uint32_t status, + size_t resid) +{ + ESPState *s = req->hba_private; + + trace_esp_command_complete(); + if (s->ti_size != 0) { + trace_esp_command_complete_unexpected(); + } + s->ti_size = 0; + s->dma_left = 0; + s->async_len = 0; + if (status) { + trace_esp_command_complete_fail(); + } + s->status = status; + s->rregs[ESP_RSTAT] = STAT_ST; + esp_dma_done(s); + if (s->current_req) { + scsi_req_unref(s->current_req); + s->current_req = NULL; + s->current_dev = NULL; + } +} + +void esp_transfer_data(SCSIRequest *req, uint32_t len) +{ + ESPState *s = req->hba_private; + + trace_esp_transfer_data(s->dma_left, s->ti_size); + s->async_len = len; + s->async_buf = scsi_req_get_buf(req); + 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; + + if (s->dma && !s->dma_enabled) { + s->dma_cb = handle_ti; + return; + } + + dmalen = s->rregs[ESP_TCLO]; + dmalen |= s->rregs[ESP_TCMID] << 8; + dmalen |= s->rregs[ESP_TCHI] << 16; + 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; + trace_esp_handle_ti(minlen); + if (s->dma) { + s->dma_left = minlen; + s->rregs[ESP_RSTAT] &= ~STAT_TC; + esp_do_dma(s); + } else if (s->do_cmd) { + trace_esp_handle_ti_cmd(s->cmdlen); + s->ti_size = 0; + s->cmdlen = 0; + s->do_cmd = 0; + do_cmd(s, s->cmdbuf); + return; + } +} + +void esp_hard_reset(ESPState *s) +{ + memset(s->rregs, 0, ESP_REGS); + memset(s->wregs, 0, ESP_REGS); + s->tchi_written = 0; + s->ti_size = 0; + s->ti_rptr = 0; + s->ti_wptr = 0; + s->dma = 0; + s->do_cmd = 0; + s->dma_cb = NULL; + + s->rregs[ESP_CFG1] = 7; +} + +static void esp_soft_reset(ESPState *s) +{ + qemu_irq_lower(s->irq); + esp_hard_reset(s); +} + +static void parent_esp_reset(ESPState *s, int irq, int level) +{ + if (level) { + esp_soft_reset(s); + } +} + +uint64_t esp_reg_read(ESPState *s, uint32_t saddr) +{ + uint32_t old_val; + + trace_esp_mem_readb(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. */ + qemu_log_mask(LOG_UNIMP, + "esp: 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; + case ESP_TCHI: + /* Return the unique id if the value has never been written */ + if (!s->tchi_written) { + return s->chip_id; + } + default: + break; + } + return s->rregs[saddr]; +} + +void esp_reg_write(ESPState *s, uint32_t saddr, uint64_t val) +{ + trace_esp_mem_writeb(saddr, s->wregs[saddr], val); + switch (saddr) { + case ESP_TCHI: + s->tchi_written = true; + /* fall through */ + 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) { + trace_esp_error_fifo_overrun(); + } 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]; + s->rregs[ESP_TCHI] = s->wregs[ESP_TCHI]; + } else { + s->dma = 0; + } + switch(val & CMD_CMD) { + case CMD_NOP: + trace_esp_mem_writeb_cmd_nop(val); + break; + case CMD_FLUSH: + trace_esp_mem_writeb_cmd_flush(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: + trace_esp_mem_writeb_cmd_reset(val); + esp_soft_reset(s); + break; + case CMD_BUSRESET: + trace_esp_mem_writeb_cmd_bus_reset(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: + trace_esp_mem_writeb_cmd_iccs(val); + write_response(s); + s->rregs[ESP_RINTR] = INTR_FC; + s->rregs[ESP_RSTAT] |= STAT_MI; + break; + case CMD_MSGACC: + trace_esp_mem_writeb_cmd_msgacc(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: + trace_esp_mem_writeb_cmd_pad(val); + s->rregs[ESP_RSTAT] = STAT_TC; + s->rregs[ESP_RINTR] = INTR_FC; + s->rregs[ESP_RSEQ] = 0; + break; + case CMD_SATN: + trace_esp_mem_writeb_cmd_satn(val); + break; + case CMD_RSTATN: + trace_esp_mem_writeb_cmd_rstatn(val); + break; + case CMD_SEL: + trace_esp_mem_writeb_cmd_sel(val); + handle_s_without_atn(s); + break; + case CMD_SELATN: + trace_esp_mem_writeb_cmd_selatn(val); + handle_satn(s); + break; + case CMD_SELATNS: + trace_esp_mem_writeb_cmd_selatns(val); + handle_satn_stop(s); + break; + case CMD_ENSEL: + trace_esp_mem_writeb_cmd_ensel(val); + s->rregs[ESP_RINTR] = 0; + break; + case CMD_DISSEL: + trace_esp_mem_writeb_cmd_dissel(val); + s->rregs[ESP_RINTR] = 0; + esp_raise_irq(s); + break; + default: + trace_esp_error_unhandled_command(val); + break; + } + break; + case ESP_WBUSID ... ESP_WSYNO: + break; + case ESP_CFG1: + case ESP_CFG2: case ESP_CFG3: + case ESP_RES3: case ESP_RES4: + s->rregs[saddr] = val; + break; + case ESP_WCCF ... ESP_WTEST: + break; + default: + trace_esp_error_invalid_write(val, saddr); + return; + } + s->wregs[saddr] = val; +} + +static bool esp_mem_accepts(void *opaque, hwaddr addr, + unsigned size, bool is_write) +{ + return (size == 1) || (is_write && size == 4); +} + +const VMStateDescription vmstate_esp = { + .name ="esp", + .version_id = 3, + .minimum_version_id = 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(status, 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() + } +}; + +#define TYPE_ESP "esp" +#define ESP(obj) OBJECT_CHECK(SysBusESPState, (obj), TYPE_ESP) + +typedef struct { + /*< private >*/ + SysBusDevice parent_obj; + /*< public >*/ + + MemoryRegion iomem; + uint32_t it_shift; + ESPState esp; +} SysBusESPState; + +static void sysbus_esp_mem_write(void *opaque, hwaddr addr, + uint64_t val, unsigned int size) +{ + SysBusESPState *sysbus = opaque; + uint32_t saddr; + + saddr = addr >> sysbus->it_shift; + esp_reg_write(&sysbus->esp, saddr, val); +} + +static uint64_t sysbus_esp_mem_read(void *opaque, hwaddr addr, + unsigned int size) +{ + SysBusESPState *sysbus = opaque; + uint32_t saddr; + + saddr = addr >> sysbus->it_shift; + return esp_reg_read(&sysbus->esp, saddr); +} + +static const MemoryRegionOps sysbus_esp_mem_ops = { + .read = sysbus_esp_mem_read, + .write = sysbus_esp_mem_write, + .endianness = DEVICE_NATIVE_ENDIAN, + .valid.accepts = esp_mem_accepts, +}; + +void esp_init(hwaddr espaddr, int it_shift, + ESPDMAMemoryReadWriteFunc dma_memory_read, + ESPDMAMemoryReadWriteFunc dma_memory_write, + void *dma_opaque, qemu_irq irq, qemu_irq *reset, + qemu_irq *dma_enable) +{ + DeviceState *dev; + SysBusDevice *s; + SysBusESPState *sysbus; + ESPState *esp; + + dev = qdev_create(NULL, TYPE_ESP); + sysbus = ESP(dev); + esp = &sysbus->esp; + esp->dma_memory_read = dma_memory_read; + esp->dma_memory_write = dma_memory_write; + esp->dma_opaque = dma_opaque; + sysbus->it_shift = it_shift; + /* XXX for now until rc4030 has been changed to use DMA enable signal */ + esp->dma_enabled = 1; + qdev_init_nofail(dev); + s = SYS_BUS_DEVICE(dev); + sysbus_connect_irq(s, 0, irq); + sysbus_mmio_map(s, 0, espaddr); + *reset = qdev_get_gpio_in(dev, 0); + *dma_enable = qdev_get_gpio_in(dev, 1); +} + +static const struct SCSIBusInfo esp_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 sysbus_esp_gpio_demux(void *opaque, int irq, int level) +{ + SysBusESPState *sysbus = ESP(opaque); + ESPState *s = &sysbus->esp; + + switch (irq) { + case 0: + parent_esp_reset(s, irq, level); + break; + case 1: + esp_dma_enable(opaque, irq, level); + break; + } +} + +static void sysbus_esp_realize(DeviceState *dev, Error **errp) +{ + SysBusDevice *sbd = SYS_BUS_DEVICE(dev); + SysBusESPState *sysbus = ESP(dev); + ESPState *s = &sysbus->esp; + Error *err = NULL; + + sysbus_init_irq(sbd, &s->irq); + assert(sysbus->it_shift != -1); + + s->chip_id = TCHI_FAS100A; + memory_region_init_io(&sysbus->iomem, OBJECT(sysbus), &sysbus_esp_mem_ops, + sysbus, "esp", ESP_REGS << sysbus->it_shift); + sysbus_init_mmio(sbd, &sysbus->iomem); + + qdev_init_gpio_in(dev, sysbus_esp_gpio_demux, 2); + + scsi_bus_new(&s->bus, sizeof(s->bus), dev, &esp_scsi_info, NULL); + scsi_bus_legacy_handle_cmdline(&s->bus, &err); + if (err != NULL) { + error_propagate(errp, err); + return; + } +} + +static void sysbus_esp_hard_reset(DeviceState *dev) +{ + SysBusESPState *sysbus = ESP(dev); + esp_hard_reset(&sysbus->esp); +} + +static const VMStateDescription vmstate_sysbus_esp_scsi = { + .name = "sysbusespscsi", + .version_id = 0, + .minimum_version_id = 0, + .fields = (VMStateField[]) { + VMSTATE_STRUCT(esp, SysBusESPState, 0, vmstate_esp, ESPState), + VMSTATE_END_OF_LIST() + } +}; + +static void sysbus_esp_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + + dc->realize = sysbus_esp_realize; + dc->reset = sysbus_esp_hard_reset; + dc->vmsd = &vmstate_sysbus_esp_scsi; + set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); +} + +static const TypeInfo sysbus_esp_info = { + .name = TYPE_ESP, + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(SysBusESPState), + .class_init = sysbus_esp_class_init, +}; + +static void esp_register_types(void) +{ + type_register_static(&sysbus_esp_info); +} + +type_init(esp_register_types) |
