| /* |
| * Arm PrimeCell PL011 UART |
| * |
| * Copyright (c) 2006 CodeSourcery. |
| * Written by Paul Brook |
| * |
| * This code is licensed under the GPL. |
| */ |
| |
| /* |
| * QEMU interface: |
| * + sysbus MMIO region 0: device registers |
| * + sysbus IRQ 0: UARTINTR (combined interrupt line) |
| * + sysbus IRQ 1: UARTRXINTR (receive FIFO interrupt line) |
| * + sysbus IRQ 2: UARTTXINTR (transmit FIFO interrupt line) |
| * + sysbus IRQ 3: UARTRTINTR (receive timeout interrupt line) |
| * + sysbus IRQ 4: UARTMSINTR (momem status interrupt line) |
| * + sysbus IRQ 5: UARTEINTR (error interrupt line) |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "hw/char/pl011.h" |
| #include "hw/sysbus.h" |
| #include "chardev/char-fe.h" |
| #include "qemu/log.h" |
| #include "qemu/module.h" |
| #include "trace.h" |
| |
| #define PL011_INT_TX 0x20 |
| #define PL011_INT_RX 0x10 |
| |
| #define PL011_FLAG_TXFE 0x80 |
| #define PL011_FLAG_RXFF 0x40 |
| #define PL011_FLAG_TXFF 0x20 |
| #define PL011_FLAG_RXFE 0x10 |
| |
| /* Interrupt status bits in UARTRIS, UARTMIS, UARTIMSC */ |
| #define INT_OE (1 << 10) |
| #define INT_BE (1 << 9) |
| #define INT_PE (1 << 8) |
| #define INT_FE (1 << 7) |
| #define INT_RT (1 << 6) |
| #define INT_TX (1 << 5) |
| #define INT_RX (1 << 4) |
| #define INT_DSR (1 << 3) |
| #define INT_DCD (1 << 2) |
| #define INT_CTS (1 << 1) |
| #define INT_RI (1 << 0) |
| #define INT_E (INT_OE | INT_BE | INT_PE | INT_FE) |
| #define INT_MS (INT_RI | INT_DSR | INT_DCD | INT_CTS) |
| |
| static const unsigned char pl011_id_arm[8] = |
| { 0x11, 0x10, 0x14, 0x00, 0x0d, 0xf0, 0x05, 0xb1 }; |
| static const unsigned char pl011_id_luminary[8] = |
| { 0x11, 0x00, 0x18, 0x01, 0x0d, 0xf0, 0x05, 0xb1 }; |
| |
| /* Which bits in the interrupt status matter for each outbound IRQ line ? */ |
| static const uint32_t irqmask[] = { |
| INT_E | INT_MS | INT_RT | INT_TX | INT_RX, /* combined IRQ */ |
| INT_RX, |
| INT_TX, |
| INT_RT, |
| INT_MS, |
| INT_E, |
| }; |
| |
| static void pl011_update(PL011State *s) |
| { |
| uint32_t flags; |
| int i; |
| |
| flags = s->int_level & s->int_enabled; |
| trace_pl011_irq_state(flags != 0); |
| for (i = 0; i < ARRAY_SIZE(s->irq); i++) { |
| qemu_set_irq(s->irq[i], (flags & irqmask[i]) != 0); |
| } |
| } |
| |
| static uint64_t pl011_read(void *opaque, hwaddr offset, |
| unsigned size) |
| { |
| PL011State *s = (PL011State *)opaque; |
| uint32_t c; |
| uint64_t r; |
| |
| switch (offset >> 2) { |
| case 0: /* UARTDR */ |
| s->flags &= ~PL011_FLAG_RXFF; |
| c = s->read_fifo[s->read_pos]; |
| if (s->read_count > 0) { |
| s->read_count--; |
| if (++s->read_pos == 16) |
| s->read_pos = 0; |
| } |
| if (s->read_count == 0) { |
| s->flags |= PL011_FLAG_RXFE; |
| } |
| if (s->read_count == s->read_trigger - 1) |
| s->int_level &= ~ PL011_INT_RX; |
| trace_pl011_read_fifo(s->read_count); |
| s->rsr = c >> 8; |
| pl011_update(s); |
| qemu_chr_fe_accept_input(&s->chr); |
| r = c; |
| break; |
| case 1: /* UARTRSR */ |
| r = s->rsr; |
| break; |
| case 6: /* UARTFR */ |
| r = s->flags; |
| break; |
| case 8: /* UARTILPR */ |
| r = s->ilpr; |
| break; |
| case 9: /* UARTIBRD */ |
| r = s->ibrd; |
| break; |
| case 10: /* UARTFBRD */ |
| r = s->fbrd; |
| break; |
| case 11: /* UARTLCR_H */ |
| r = s->lcr; |
| break; |
| case 12: /* UARTCR */ |
| r = s->cr; |
| break; |
| case 13: /* UARTIFLS */ |
| r = s->ifl; |
| break; |
| case 14: /* UARTIMSC */ |
| r = s->int_enabled; |
| break; |
| case 15: /* UARTRIS */ |
| r = s->int_level; |
| break; |
| case 16: /* UARTMIS */ |
| r = s->int_level & s->int_enabled; |
| break; |
| case 18: /* UARTDMACR */ |
| r = s->dmacr; |
| break; |
| case 0x3f8 ... 0x400: |
| r = s->id[(offset - 0xfe0) >> 2]; |
| break; |
| default: |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "pl011_read: Bad offset 0x%x\n", (int)offset); |
| r = 0; |
| break; |
| } |
| |
| trace_pl011_read(offset, r); |
| return r; |
| } |
| |
| static void pl011_set_read_trigger(PL011State *s) |
| { |
| #if 0 |
| /* The docs say the RX interrupt is triggered when the FIFO exceeds |
| the threshold. However linux only reads the FIFO in response to an |
| interrupt. Triggering the interrupt when the FIFO is non-empty seems |
| to make things work. */ |
| if (s->lcr & 0x10) |
| s->read_trigger = (s->ifl >> 1) & 0x1c; |
| else |
| #endif |
| s->read_trigger = 1; |
| } |
| |
| static void pl011_write(void *opaque, hwaddr offset, |
| uint64_t value, unsigned size) |
| { |
| PL011State *s = (PL011State *)opaque; |
| unsigned char ch; |
| |
| trace_pl011_write(offset, value); |
| |
| switch (offset >> 2) { |
| case 0: /* UARTDR */ |
| /* ??? Check if transmitter is enabled. */ |
| ch = value; |
| /* XXX this blocks entire thread. Rewrite to use |
| * qemu_chr_fe_write and background I/O callbacks */ |
| qemu_chr_fe_write_all(&s->chr, &ch, 1); |
| s->int_level |= PL011_INT_TX; |
| pl011_update(s); |
| break; |
| case 1: /* UARTRSR/UARTECR */ |
| s->rsr = 0; |
| break; |
| case 6: /* UARTFR */ |
| /* Writes to Flag register are ignored. */ |
| break; |
| case 8: /* UARTUARTILPR */ |
| s->ilpr = value; |
| break; |
| case 9: /* UARTIBRD */ |
| s->ibrd = value; |
| break; |
| case 10: /* UARTFBRD */ |
| s->fbrd = value; |
| break; |
| case 11: /* UARTLCR_H */ |
| /* Reset the FIFO state on FIFO enable or disable */ |
| if ((s->lcr ^ value) & 0x10) { |
| s->read_count = 0; |
| s->read_pos = 0; |
| } |
| s->lcr = value; |
| pl011_set_read_trigger(s); |
| break; |
| case 12: /* UARTCR */ |
| /* ??? Need to implement the enable and loopback bits. */ |
| s->cr = value; |
| break; |
| case 13: /* UARTIFS */ |
| s->ifl = value; |
| pl011_set_read_trigger(s); |
| break; |
| case 14: /* UARTIMSC */ |
| s->int_enabled = value; |
| pl011_update(s); |
| break; |
| case 17: /* UARTICR */ |
| s->int_level &= ~value; |
| pl011_update(s); |
| break; |
| case 18: /* UARTDMACR */ |
| s->dmacr = value; |
| if (value & 3) { |
| qemu_log_mask(LOG_UNIMP, "pl011: DMA not implemented\n"); |
| } |
| break; |
| default: |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "pl011_write: Bad offset 0x%x\n", (int)offset); |
| } |
| } |
| |
| static int pl011_can_receive(void *opaque) |
| { |
| PL011State *s = (PL011State *)opaque; |
| int r; |
| |
| if (s->lcr & 0x10) { |
| r = s->read_count < 16; |
| } else { |
| r = s->read_count < 1; |
| } |
| trace_pl011_can_receive(s->lcr, s->read_count, r); |
| return r; |
| } |
| |
| static void pl011_put_fifo(void *opaque, uint32_t value) |
| { |
| PL011State *s = (PL011State *)opaque; |
| int slot; |
| |
| slot = s->read_pos + s->read_count; |
| if (slot >= 16) |
| slot -= 16; |
| s->read_fifo[slot] = value; |
| s->read_count++; |
| s->flags &= ~PL011_FLAG_RXFE; |
| trace_pl011_put_fifo(value, s->read_count); |
| if (!(s->lcr & 0x10) || s->read_count == 16) { |
| trace_pl011_put_fifo_full(); |
| s->flags |= PL011_FLAG_RXFF; |
| } |
| if (s->read_count == s->read_trigger) { |
| s->int_level |= PL011_INT_RX; |
| pl011_update(s); |
| } |
| } |
| |
| static void pl011_receive(void *opaque, const uint8_t *buf, int size) |
| { |
| pl011_put_fifo(opaque, *buf); |
| } |
| |
| static void pl011_event(void *opaque, int event) |
| { |
| if (event == CHR_EVENT_BREAK) |
| pl011_put_fifo(opaque, 0x400); |
| } |
| |
| static const MemoryRegionOps pl011_ops = { |
| .read = pl011_read, |
| .write = pl011_write, |
| .endianness = DEVICE_NATIVE_ENDIAN, |
| }; |
| |
| static const VMStateDescription vmstate_pl011 = { |
| .name = "pl011", |
| .version_id = 2, |
| .minimum_version_id = 2, |
| .fields = (VMStateField[]) { |
| VMSTATE_UINT32(readbuff, PL011State), |
| VMSTATE_UINT32(flags, PL011State), |
| VMSTATE_UINT32(lcr, PL011State), |
| VMSTATE_UINT32(rsr, PL011State), |
| VMSTATE_UINT32(cr, PL011State), |
| VMSTATE_UINT32(dmacr, PL011State), |
| VMSTATE_UINT32(int_enabled, PL011State), |
| VMSTATE_UINT32(int_level, PL011State), |
| VMSTATE_UINT32_ARRAY(read_fifo, PL011State, 16), |
| VMSTATE_UINT32(ilpr, PL011State), |
| VMSTATE_UINT32(ibrd, PL011State), |
| VMSTATE_UINT32(fbrd, PL011State), |
| VMSTATE_UINT32(ifl, PL011State), |
| VMSTATE_INT32(read_pos, PL011State), |
| VMSTATE_INT32(read_count, PL011State), |
| VMSTATE_INT32(read_trigger, PL011State), |
| VMSTATE_END_OF_LIST() |
| } |
| }; |
| |
| static Property pl011_properties[] = { |
| DEFINE_PROP_CHR("chardev", PL011State, chr), |
| DEFINE_PROP_END_OF_LIST(), |
| }; |
| |
| static void pl011_init(Object *obj) |
| { |
| SysBusDevice *sbd = SYS_BUS_DEVICE(obj); |
| PL011State *s = PL011(obj); |
| int i; |
| |
| memory_region_init_io(&s->iomem, OBJECT(s), &pl011_ops, s, "pl011", 0x1000); |
| sysbus_init_mmio(sbd, &s->iomem); |
| for (i = 0; i < ARRAY_SIZE(s->irq); i++) { |
| sysbus_init_irq(sbd, &s->irq[i]); |
| } |
| |
| s->read_trigger = 1; |
| s->ifl = 0x12; |
| s->cr = 0x300; |
| s->flags = 0x90; |
| |
| s->id = pl011_id_arm; |
| } |
| |
| static void pl011_realize(DeviceState *dev, Error **errp) |
| { |
| PL011State *s = PL011(dev); |
| |
| qemu_chr_fe_set_handlers(&s->chr, pl011_can_receive, pl011_receive, |
| pl011_event, NULL, s, NULL, true); |
| } |
| |
| static void pl011_class_init(ObjectClass *oc, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(oc); |
| |
| dc->realize = pl011_realize; |
| dc->vmsd = &vmstate_pl011; |
| dc->props = pl011_properties; |
| } |
| |
| static const TypeInfo pl011_arm_info = { |
| .name = TYPE_PL011, |
| .parent = TYPE_SYS_BUS_DEVICE, |
| .instance_size = sizeof(PL011State), |
| .instance_init = pl011_init, |
| .class_init = pl011_class_init, |
| }; |
| |
| static void pl011_luminary_init(Object *obj) |
| { |
| PL011State *s = PL011(obj); |
| |
| s->id = pl011_id_luminary; |
| } |
| |
| static const TypeInfo pl011_luminary_info = { |
| .name = TYPE_PL011_LUMINARY, |
| .parent = TYPE_PL011, |
| .instance_init = pl011_luminary_init, |
| }; |
| |
| static void pl011_register_types(void) |
| { |
| type_register_static(&pl011_arm_info); |
| type_register_static(&pl011_luminary_info); |
| } |
| |
| type_init(pl011_register_types) |