| /* |
| * QEMU GE IP-Octal 232 IndustryPack emulation |
| * |
| * Copyright (C) 2012 Igalia, S.L. |
| * Author: Alberto Garcia <agarcia@igalia.com> |
| * |
| * This code is licensed under the GNU GPL v2 or (at your option) any |
| * later version. |
| */ |
| |
| #include "hw/ipack.h" |
| #include "qemu/bitops.h" |
| #include "char/char.h" |
| |
| /* #define DEBUG_IPOCTAL */ |
| |
| #ifdef DEBUG_IPOCTAL |
| #define DPRINTF2(fmt, ...) \ |
| do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) |
| #else |
| #define DPRINTF2(fmt, ...) do { } while (0) |
| #endif |
| |
| #define DPRINTF(fmt, ...) DPRINTF2("IP-Octal: " fmt, ## __VA_ARGS__) |
| |
| #define RX_FIFO_SIZE 3 |
| |
| /* The IP-Octal has 8 channels (a-h) |
| divided into 4 blocks (A-D) */ |
| #define N_CHANNELS 8 |
| #define N_BLOCKS 4 |
| |
| #define REG_MRa 0x01 |
| #define REG_MRb 0x11 |
| #define REG_SRa 0x03 |
| #define REG_SRb 0x13 |
| #define REG_CSRa 0x03 |
| #define REG_CSRb 0x13 |
| #define REG_CRa 0x05 |
| #define REG_CRb 0x15 |
| #define REG_RHRa 0x07 |
| #define REG_RHRb 0x17 |
| #define REG_THRa 0x07 |
| #define REG_THRb 0x17 |
| #define REG_ACR 0x09 |
| #define REG_ISR 0x0B |
| #define REG_IMR 0x0B |
| #define REG_OPCR 0x1B |
| |
| #define CR_ENABLE_RX BIT(0) |
| #define CR_DISABLE_RX BIT(1) |
| #define CR_ENABLE_TX BIT(2) |
| #define CR_DISABLE_TX BIT(3) |
| #define CR_CMD(cr) ((cr) >> 4) |
| #define CR_NO_OP 0 |
| #define CR_RESET_MR 1 |
| #define CR_RESET_RX 2 |
| #define CR_RESET_TX 3 |
| #define CR_RESET_ERR 4 |
| #define CR_RESET_BRKINT 5 |
| #define CR_START_BRK 6 |
| #define CR_STOP_BRK 7 |
| #define CR_ASSERT_RTSN 8 |
| #define CR_NEGATE_RTSN 9 |
| #define CR_TIMEOUT_ON 10 |
| #define CR_TIMEOUT_OFF 12 |
| |
| #define SR_RXRDY BIT(0) |
| #define SR_FFULL BIT(1) |
| #define SR_TXRDY BIT(2) |
| #define SR_TXEMT BIT(3) |
| #define SR_OVERRUN BIT(4) |
| #define SR_PARITY BIT(5) |
| #define SR_FRAMING BIT(6) |
| #define SR_BREAK BIT(7) |
| |
| #define ISR_TXRDYA BIT(0) |
| #define ISR_RXRDYA BIT(1) |
| #define ISR_BREAKA BIT(2) |
| #define ISR_CNTRDY BIT(3) |
| #define ISR_TXRDYB BIT(4) |
| #define ISR_RXRDYB BIT(5) |
| #define ISR_BREAKB BIT(6) |
| #define ISR_MPICHG BIT(7) |
| #define ISR_TXRDY(CH) (((CH) & 1) ? BIT(4) : BIT(0)) |
| #define ISR_RXRDY(CH) (((CH) & 1) ? BIT(5) : BIT(1)) |
| #define ISR_BREAK(CH) (((CH) & 1) ? BIT(6) : BIT(2)) |
| |
| typedef struct IPOctalState IPOctalState; |
| typedef struct SCC2698Channel SCC2698Channel; |
| typedef struct SCC2698Block SCC2698Block; |
| |
| struct SCC2698Channel { |
| IPOctalState *ipoctal; |
| CharDriverState *dev; |
| bool rx_enabled; |
| uint8_t mr[2]; |
| uint8_t mr_idx; |
| uint8_t sr; |
| uint8_t rhr[RX_FIFO_SIZE]; |
| uint8_t rhr_idx; |
| uint8_t rx_pending; |
| }; |
| |
| struct SCC2698Block { |
| uint8_t imr; |
| uint8_t isr; |
| }; |
| |
| struct IPOctalState { |
| IPackDevice dev; |
| SCC2698Channel ch[N_CHANNELS]; |
| SCC2698Block blk[N_BLOCKS]; |
| uint8_t irq_vector; |
| }; |
| |
| #define TYPE_IPOCTAL "ipoctal232" |
| |
| #define IPOCTAL(obj) \ |
| OBJECT_CHECK(IPOctalState, (obj), TYPE_IPOCTAL) |
| |
| static const VMStateDescription vmstate_scc2698_channel = { |
| .name = "scc2698_channel", |
| .version_id = 1, |
| .minimum_version_id = 1, |
| .minimum_version_id_old = 1, |
| .fields = (VMStateField[]) { |
| VMSTATE_BOOL(rx_enabled, SCC2698Channel), |
| VMSTATE_UINT8_ARRAY(mr, SCC2698Channel, 2), |
| VMSTATE_UINT8(mr_idx, SCC2698Channel), |
| VMSTATE_UINT8(sr, SCC2698Channel), |
| VMSTATE_UINT8_ARRAY(rhr, SCC2698Channel, RX_FIFO_SIZE), |
| VMSTATE_UINT8(rhr_idx, SCC2698Channel), |
| VMSTATE_UINT8(rx_pending, SCC2698Channel), |
| VMSTATE_END_OF_LIST() |
| } |
| }; |
| |
| static const VMStateDescription vmstate_scc2698_block = { |
| .name = "scc2698_block", |
| .version_id = 1, |
| .minimum_version_id = 1, |
| .minimum_version_id_old = 1, |
| .fields = (VMStateField[]) { |
| VMSTATE_UINT8(imr, SCC2698Block), |
| VMSTATE_UINT8(isr, SCC2698Block), |
| VMSTATE_END_OF_LIST() |
| } |
| }; |
| |
| static const VMStateDescription vmstate_ipoctal = { |
| .name = "ipoctal232", |
| .version_id = 1, |
| .minimum_version_id = 1, |
| .minimum_version_id_old = 1, |
| .fields = (VMStateField[]) { |
| VMSTATE_IPACK_DEVICE(dev, IPOctalState), |
| VMSTATE_STRUCT_ARRAY(ch, IPOctalState, N_CHANNELS, 1, |
| vmstate_scc2698_channel, SCC2698Channel), |
| VMSTATE_STRUCT_ARRAY(blk, IPOctalState, N_BLOCKS, 1, |
| vmstate_scc2698_block, SCC2698Block), |
| VMSTATE_UINT8(irq_vector, IPOctalState), |
| VMSTATE_END_OF_LIST() |
| } |
| }; |
| |
| /* data[10] is 0x0C, not 0x0B as the doc says */ |
| static const uint8_t id_prom_data[] = { |
| 0x49, 0x50, 0x41, 0x43, 0xF0, 0x22, |
| 0xA1, 0x00, 0x00, 0x00, 0x0C, 0xCC |
| }; |
| |
| static void update_irq(IPOctalState *dev, unsigned block) |
| { |
| /* Blocks A and B interrupt on INT0#, C and D on INT1#. |
| Thus, to get the status we have to check two blocks. */ |
| SCC2698Block *blk0 = &dev->blk[block]; |
| SCC2698Block *blk1 = &dev->blk[block^1]; |
| unsigned intno = block / 2; |
| |
| if ((blk0->isr & blk0->imr) || (blk1->isr & blk1->imr)) { |
| qemu_irq_raise(dev->dev.irq[intno]); |
| } else { |
| qemu_irq_lower(dev->dev.irq[intno]); |
| } |
| } |
| |
| static void write_cr(IPOctalState *dev, unsigned channel, uint8_t val) |
| { |
| SCC2698Channel *ch = &dev->ch[channel]; |
| SCC2698Block *blk = &dev->blk[channel / 2]; |
| |
| DPRINTF("Write CR%c %u: ", channel + 'a', val); |
| |
| /* The lower 4 bits are used to enable and disable Tx and Rx */ |
| if (val & CR_ENABLE_RX) { |
| DPRINTF2("Rx on, "); |
| ch->rx_enabled = true; |
| } |
| if (val & CR_DISABLE_RX) { |
| DPRINTF2("Rx off, "); |
| ch->rx_enabled = false; |
| } |
| if (val & CR_ENABLE_TX) { |
| DPRINTF2("Tx on, "); |
| ch->sr |= SR_TXRDY | SR_TXEMT; |
| blk->isr |= ISR_TXRDY(channel); |
| } |
| if (val & CR_DISABLE_TX) { |
| DPRINTF2("Tx off, "); |
| ch->sr &= ~(SR_TXRDY | SR_TXEMT); |
| blk->isr &= ~ISR_TXRDY(channel); |
| } |
| |
| DPRINTF2("cmd: "); |
| |
| /* The rest of the bits implement different commands */ |
| switch (CR_CMD(val)) { |
| case CR_NO_OP: |
| DPRINTF2("none"); |
| break; |
| case CR_RESET_MR: |
| DPRINTF2("reset MR"); |
| ch->mr_idx = 0; |
| break; |
| case CR_RESET_RX: |
| DPRINTF2("reset Rx"); |
| ch->rx_enabled = false; |
| ch->rx_pending = 0; |
| ch->sr &= ~SR_RXRDY; |
| blk->isr &= ~ISR_RXRDY(channel); |
| break; |
| case CR_RESET_TX: |
| DPRINTF2("reset Tx"); |
| ch->sr &= ~(SR_TXRDY | SR_TXEMT); |
| blk->isr &= ~ISR_TXRDY(channel); |
| break; |
| case CR_RESET_ERR: |
| DPRINTF2("reset err"); |
| ch->sr &= ~(SR_OVERRUN | SR_PARITY | SR_FRAMING | SR_BREAK); |
| break; |
| case CR_RESET_BRKINT: |
| DPRINTF2("reset brk ch int"); |
| blk->isr &= ~(ISR_BREAKA | ISR_BREAKB); |
| break; |
| default: |
| DPRINTF2("unsupported 0x%x", CR_CMD(val)); |
| } |
| |
| DPRINTF2("\n"); |
| } |
| |
| static uint16_t io_read(IPackDevice *ip, uint8_t addr) |
| { |
| IPOctalState *dev = IPOCTAL(ip); |
| uint16_t ret = 0; |
| /* addr[7:6]: block (A-D) |
| addr[7:5]: channel (a-h) |
| addr[5:0]: register */ |
| unsigned block = addr >> 5; |
| unsigned channel = addr >> 4; |
| /* Big endian, accessed using 8-bit bytes at odd locations */ |
| unsigned offset = (addr & 0x1F) ^ 1; |
| SCC2698Channel *ch = &dev->ch[channel]; |
| SCC2698Block *blk = &dev->blk[block]; |
| uint8_t old_isr = blk->isr; |
| |
| switch (offset) { |
| |
| case REG_MRa: |
| case REG_MRb: |
| ret = ch->mr[ch->mr_idx]; |
| DPRINTF("Read MR%u%c: 0x%x\n", ch->mr_idx + 1, channel + 'a', ret); |
| ch->mr_idx = 1; |
| break; |
| |
| case REG_SRa: |
| case REG_SRb: |
| ret = ch->sr; |
| DPRINTF("Read SR%c: 0x%x\n", channel + 'a', ret); |
| break; |
| |
| case REG_RHRa: |
| case REG_RHRb: |
| ret = ch->rhr[ch->rhr_idx]; |
| if (ch->rx_pending > 0) { |
| ch->rx_pending--; |
| if (ch->rx_pending == 0) { |
| ch->sr &= ~SR_RXRDY; |
| blk->isr &= ~ISR_RXRDY(channel); |
| if (ch->dev) { |
| qemu_chr_accept_input(ch->dev); |
| } |
| } else { |
| ch->rhr_idx = (ch->rhr_idx + 1) % RX_FIFO_SIZE; |
| } |
| if (ch->sr & SR_BREAK) { |
| ch->sr &= ~SR_BREAK; |
| blk->isr |= ISR_BREAK(channel); |
| } |
| } |
| DPRINTF("Read RHR%c (0x%x)\n", channel + 'a', ret); |
| break; |
| |
| case REG_ISR: |
| ret = blk->isr; |
| DPRINTF("Read ISR%c: 0x%x\n", block + 'A', ret); |
| break; |
| |
| default: |
| DPRINTF("Read unknown/unsupported register 0x%02x\n", offset); |
| } |
| |
| if (old_isr != blk->isr) { |
| update_irq(dev, block); |
| } |
| |
| return ret; |
| } |
| |
| static void io_write(IPackDevice *ip, uint8_t addr, uint16_t val) |
| { |
| IPOctalState *dev = IPOCTAL(ip); |
| unsigned reg = val & 0xFF; |
| /* addr[7:6]: block (A-D) |
| addr[7:5]: channel (a-h) |
| addr[5:0]: register */ |
| unsigned block = addr >> 5; |
| unsigned channel = addr >> 4; |
| /* Big endian, accessed using 8-bit bytes at odd locations */ |
| unsigned offset = (addr & 0x1F) ^ 1; |
| SCC2698Channel *ch = &dev->ch[channel]; |
| SCC2698Block *blk = &dev->blk[block]; |
| uint8_t old_isr = blk->isr; |
| uint8_t old_imr = blk->imr; |
| |
| switch (offset) { |
| |
| case REG_MRa: |
| case REG_MRb: |
| ch->mr[ch->mr_idx] = reg; |
| DPRINTF("Write MR%u%c 0x%x\n", ch->mr_idx + 1, channel + 'a', reg); |
| ch->mr_idx = 1; |
| break; |
| |
| /* Not implemented */ |
| case REG_CSRa: |
| case REG_CSRb: |
| DPRINTF("Write CSR%c: 0x%x\n", channel + 'a', reg); |
| break; |
| |
| case REG_CRa: |
| case REG_CRb: |
| write_cr(dev, channel, reg); |
| break; |
| |
| case REG_THRa: |
| case REG_THRb: |
| if (ch->sr & SR_TXRDY) { |
| DPRINTF("Write THR%c (0x%x)\n", channel + 'a', reg); |
| if (ch->dev) { |
| uint8_t thr = reg; |
| qemu_chr_fe_write(ch->dev, &thr, 1); |
| } |
| } else { |
| DPRINTF("Write THR%c (0x%x), Tx disabled\n", channel + 'a', reg); |
| } |
| break; |
| |
| /* Not implemented */ |
| case REG_ACR: |
| DPRINTF("Write ACR%c 0x%x\n", block + 'A', val); |
| break; |
| |
| case REG_IMR: |
| DPRINTF("Write IMR%c 0x%x\n", block + 'A', val); |
| blk->imr = reg; |
| break; |
| |
| /* Not implemented */ |
| case REG_OPCR: |
| DPRINTF("Write OPCR%c 0x%x\n", block + 'A', val); |
| break; |
| |
| default: |
| DPRINTF("Write unknown/unsupported register 0x%02x %u\n", offset, val); |
| } |
| |
| if (old_isr != blk->isr || old_imr != blk->imr) { |
| update_irq(dev, block); |
| } |
| } |
| |
| static uint16_t id_read(IPackDevice *ip, uint8_t addr) |
| { |
| uint16_t ret = 0; |
| unsigned pos = addr / 2; /* The ID PROM data is stored every other byte */ |
| |
| if (pos < ARRAY_SIZE(id_prom_data)) { |
| ret = id_prom_data[pos]; |
| } else { |
| DPRINTF("Attempt to read unavailable PROM data at 0x%x\n", addr); |
| } |
| |
| return ret; |
| } |
| |
| static void id_write(IPackDevice *ip, uint8_t addr, uint16_t val) |
| { |
| IPOctalState *dev = IPOCTAL(ip); |
| if (addr == 1) { |
| DPRINTF("Write IRQ vector: %u\n", (unsigned) val); |
| dev->irq_vector = val; /* Undocumented, but the hw works like that */ |
| } else { |
| DPRINTF("Attempt to write 0x%x to 0x%x\n", val, addr); |
| } |
| } |
| |
| static uint16_t int_read(IPackDevice *ip, uint8_t addr) |
| { |
| IPOctalState *dev = IPOCTAL(ip); |
| /* Read address 0 to ACK INT0# and address 2 to ACK INT1# */ |
| if (addr != 0 && addr != 2) { |
| DPRINTF("Attempt to read from 0x%x\n", addr); |
| return 0; |
| } else { |
| /* Update interrupts if necessary */ |
| update_irq(dev, addr); |
| return dev->irq_vector; |
| } |
| } |
| |
| static void int_write(IPackDevice *ip, uint8_t addr, uint16_t val) |
| { |
| DPRINTF("Attempt to write 0x%x to 0x%x\n", val, addr); |
| } |
| |
| static uint16_t mem_read16(IPackDevice *ip, uint32_t addr) |
| { |
| DPRINTF("Attempt to read from 0x%x\n", addr); |
| return 0; |
| } |
| |
| static void mem_write16(IPackDevice *ip, uint32_t addr, uint16_t val) |
| { |
| DPRINTF("Attempt to write 0x%x to 0x%x\n", val, addr); |
| } |
| |
| static uint8_t mem_read8(IPackDevice *ip, uint32_t addr) |
| { |
| DPRINTF("Attempt to read from 0x%x\n", addr); |
| return 0; |
| } |
| |
| static void mem_write8(IPackDevice *ip, uint32_t addr, uint8_t val) |
| { |
| IPOctalState *dev = IPOCTAL(ip); |
| if (addr == 1) { |
| DPRINTF("Write IRQ vector: %u\n", (unsigned) val); |
| dev->irq_vector = val; |
| } else { |
| DPRINTF("Attempt to write 0x%x to 0x%x\n", val, addr); |
| } |
| } |
| |
| static int hostdev_can_receive(void *opaque) |
| { |
| SCC2698Channel *ch = opaque; |
| int available_bytes = RX_FIFO_SIZE - ch->rx_pending; |
| return ch->rx_enabled ? available_bytes : 0; |
| } |
| |
| static void hostdev_receive(void *opaque, const uint8_t *buf, int size) |
| { |
| SCC2698Channel *ch = opaque; |
| IPOctalState *dev = ch->ipoctal; |
| unsigned pos = ch->rhr_idx + ch->rx_pending; |
| int i; |
| |
| assert(size + ch->rx_pending <= RX_FIFO_SIZE); |
| |
| /* Copy data to the RxFIFO */ |
| for (i = 0; i < size; i++) { |
| pos %= RX_FIFO_SIZE; |
| ch->rhr[pos++] = buf[i]; |
| } |
| |
| ch->rx_pending += size; |
| |
| /* If the RxFIFO was empty raise an interrupt */ |
| if (!(ch->sr & SR_RXRDY)) { |
| unsigned block, channel = 0; |
| /* Find channel number to update the ISR register */ |
| while (&dev->ch[channel] != ch) { |
| channel++; |
| } |
| block = channel / 2; |
| dev->blk[block].isr |= ISR_RXRDY(channel); |
| ch->sr |= SR_RXRDY; |
| update_irq(dev, block); |
| } |
| } |
| |
| static void hostdev_event(void *opaque, int event) |
| { |
| SCC2698Channel *ch = opaque; |
| switch (event) { |
| case CHR_EVENT_OPENED: |
| DPRINTF("Device %s opened\n", ch->dev->label); |
| break; |
| case CHR_EVENT_BREAK: { |
| uint8_t zero = 0; |
| DPRINTF("Device %s received break\n", ch->dev->label); |
| |
| if (!(ch->sr & SR_BREAK)) { |
| IPOctalState *dev = ch->ipoctal; |
| unsigned block, channel = 0; |
| |
| while (&dev->ch[channel] != ch) { |
| channel++; |
| } |
| block = channel / 2; |
| |
| ch->sr |= SR_BREAK; |
| dev->blk[block].isr |= ISR_BREAK(channel); |
| } |
| |
| /* Put a zero character in the buffer */ |
| hostdev_receive(ch, &zero, 1); |
| } |
| break; |
| default: |
| DPRINTF("Device %s received event %d\n", ch->dev->label, event); |
| } |
| } |
| |
| static int ipoctal_init(IPackDevice *ip) |
| { |
| IPOctalState *s = IPOCTAL(ip); |
| unsigned i; |
| |
| for (i = 0; i < N_CHANNELS; i++) { |
| SCC2698Channel *ch = &s->ch[i]; |
| ch->ipoctal = s; |
| |
| /* Redirect IP-Octal channels to host character devices */ |
| if (ch->dev) { |
| qemu_chr_add_handlers(ch->dev, hostdev_can_receive, |
| hostdev_receive, hostdev_event, ch); |
| DPRINTF("Redirecting channel %u to %s\n", i, ch->dev->label); |
| } else { |
| DPRINTF("Could not redirect channel %u, no chardev set\n", i); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static Property ipoctal_properties[] = { |
| DEFINE_PROP_CHR("chardev0", IPOctalState, ch[0].dev), |
| DEFINE_PROP_CHR("chardev1", IPOctalState, ch[1].dev), |
| DEFINE_PROP_CHR("chardev2", IPOctalState, ch[2].dev), |
| DEFINE_PROP_CHR("chardev3", IPOctalState, ch[3].dev), |
| DEFINE_PROP_CHR("chardev4", IPOctalState, ch[4].dev), |
| DEFINE_PROP_CHR("chardev5", IPOctalState, ch[5].dev), |
| DEFINE_PROP_CHR("chardev6", IPOctalState, ch[6].dev), |
| DEFINE_PROP_CHR("chardev7", IPOctalState, ch[7].dev), |
| DEFINE_PROP_END_OF_LIST(), |
| }; |
| |
| static void ipoctal_class_init(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| IPackDeviceClass *ic = IPACK_DEVICE_CLASS(klass); |
| |
| ic->init = ipoctal_init; |
| ic->io_read = io_read; |
| ic->io_write = io_write; |
| ic->id_read = id_read; |
| ic->id_write = id_write; |
| ic->int_read = int_read; |
| ic->int_write = int_write; |
| ic->mem_read16 = mem_read16; |
| ic->mem_write16 = mem_write16; |
| ic->mem_read8 = mem_read8; |
| ic->mem_write8 = mem_write8; |
| |
| dc->desc = "GE IP-Octal 232 8-channel RS-232 IndustryPack"; |
| dc->props = ipoctal_properties; |
| dc->vmsd = &vmstate_ipoctal; |
| } |
| |
| static const TypeInfo ipoctal_info = { |
| .name = TYPE_IPOCTAL, |
| .parent = TYPE_IPACK_DEVICE, |
| .instance_size = sizeof(IPOctalState), |
| .class_init = ipoctal_class_init, |
| }; |
| |
| static void ipoctal_register_types(void) |
| { |
| type_register_static(&ipoctal_info); |
| } |
| |
| type_init(ipoctal_register_types) |
