| /* |
| * IMX31 UARTS |
| * |
| * Copyright (c) 2008 OKL |
| * Originally Written by Hans Jiang |
| * Copyright (c) 2011 NICTA Pty Ltd. |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| * See the COPYING file in the top-level directory. |
| * |
| * This is a `bare-bones' implementation of the IMX series serial ports. |
| * TODO: |
| * -- implement FIFOs. The real hardware has 32 word transmit |
| * and receive FIFOs; we currently use a 1-char buffer |
| * -- implement DMA |
| * -- implement BAUD-rate and modem lines, for when the backend |
| * is a real serial device. |
| */ |
| |
| #include "hw.h" |
| #include "sysbus.h" |
| #include "sysemu/sysemu.h" |
| #include "char/char.h" |
| #include "imx.h" |
| |
| //#define DEBUG_SERIAL 1 |
| #ifdef DEBUG_SERIAL |
| #define DPRINTF(fmt, args...) \ |
| do { printf("imx_serial: " fmt , ##args); } while (0) |
| #else |
| #define DPRINTF(fmt, args...) do {} while (0) |
| #endif |
| |
| /* |
| * Define to 1 for messages about attempts to |
| * access unimplemented registers or similar. |
| */ |
| //#define DEBUG_IMPLEMENTATION 1 |
| #ifdef DEBUG_IMPLEMENTATION |
| # define IPRINTF(fmt, args...) \ |
| do { fprintf(stderr, "imx_serial: " fmt, ##args); } while (0) |
| #else |
| # define IPRINTF(fmt, args...) do {} while (0) |
| #endif |
| |
| typedef struct { |
| SysBusDevice busdev; |
| MemoryRegion iomem; |
| int32_t readbuff; |
| |
| uint32_t usr1; |
| uint32_t usr2; |
| uint32_t ucr1; |
| uint32_t ucr2; |
| uint32_t uts1; |
| |
| /* |
| * The registers below are implemented just so that the |
| * guest OS sees what it has written |
| */ |
| uint32_t onems; |
| uint32_t ufcr; |
| uint32_t ubmr; |
| uint32_t ubrc; |
| uint32_t ucr3; |
| |
| qemu_irq irq; |
| CharDriverState *chr; |
| } IMXSerialState; |
| |
| static const VMStateDescription vmstate_imx_serial = { |
| .name = "imx-serial", |
| .version_id = 1, |
| .minimum_version_id = 1, |
| .minimum_version_id_old = 1, |
| .fields = (VMStateField[]) { |
| VMSTATE_INT32(readbuff, IMXSerialState), |
| VMSTATE_UINT32(usr1, IMXSerialState), |
| VMSTATE_UINT32(usr2, IMXSerialState), |
| VMSTATE_UINT32(ucr1, IMXSerialState), |
| VMSTATE_UINT32(uts1, IMXSerialState), |
| VMSTATE_UINT32(onems, IMXSerialState), |
| VMSTATE_UINT32(ufcr, IMXSerialState), |
| VMSTATE_UINT32(ubmr, IMXSerialState), |
| VMSTATE_UINT32(ubrc, IMXSerialState), |
| VMSTATE_UINT32(ucr3, IMXSerialState), |
| VMSTATE_END_OF_LIST() |
| }, |
| }; |
| |
| |
| #define URXD_CHARRDY (1<<15) /* character read is valid */ |
| #define URXD_ERR (1<<14) /* Character has error */ |
| #define URXD_BRK (1<<11) /* Break received */ |
| |
| #define USR1_PARTYER (1<<15) /* Parity Error */ |
| #define USR1_RTSS (1<<14) /* RTS pin status */ |
| #define USR1_TRDY (1<<13) /* Tx ready */ |
| #define USR1_RTSD (1<<12) /* RTS delta: pin changed state */ |
| #define USR1_ESCF (1<<11) /* Escape sequence interrupt */ |
| #define USR1_FRAMERR (1<<10) /* Framing error */ |
| #define USR1_RRDY (1<<9) /* receiver ready */ |
| #define USR1_AGTIM (1<<8) /* Aging timer interrupt */ |
| #define USR1_DTRD (1<<7) /* DTR changed */ |
| #define USR1_RXDS (1<<6) /* Receiver is idle */ |
| #define USR1_AIRINT (1<<5) /* Aysnch IR interrupt */ |
| #define USR1_AWAKE (1<<4) /* Falling edge detected on RXd pin */ |
| |
| #define USR2_ADET (1<<15) /* Autobaud complete */ |
| #define USR2_TXFE (1<<14) /* Transmit FIFO empty */ |
| #define USR2_DTRF (1<<13) /* DTR/DSR transition */ |
| #define USR2_IDLE (1<<12) /* UART has been idle for too long */ |
| #define USR2_ACST (1<<11) /* Autobaud counter stopped */ |
| #define USR2_RIDELT (1<<10) /* Ring Indicator delta */ |
| #define USR2_RIIN (1<<9) /* Ring Indicator Input */ |
| #define USR2_IRINT (1<<8) /* Serial Infrared Interrupt */ |
| #define USR2_WAKE (1<<7) /* Start bit detected */ |
| #define USR2_DCDDELT (1<<6) /* Data Carrier Detect delta */ |
| #define USR2_DCDIN (1<<5) /* Data Carrier Detect Input */ |
| #define USR2_RTSF (1<<4) /* RTS transition */ |
| #define USR2_TXDC (1<<3) /* Transmission complete */ |
| #define USR2_BRCD (1<<2) /* Break condition detected */ |
| #define USR2_ORE (1<<1) /* Overrun error */ |
| #define USR2_RDR (1<<0) /* Receive data ready */ |
| |
| #define UCR1_TRDYEN (1<<13) /* Tx Ready Interrupt Enable */ |
| #define UCR1_RRDYEN (1<<9) /* Rx Ready Interrupt Enable */ |
| #define UCR1_TXMPTYEN (1<<6) /* Tx Empty Interrupt Enable */ |
| #define UCR1_UARTEN (1<<0) /* UART Enable */ |
| |
| #define UCR2_TXEN (1<<2) /* Transmitter enable */ |
| #define UCR2_RXEN (1<<1) /* Receiver enable */ |
| #define UCR2_SRST (1<<0) /* Reset complete */ |
| |
| #define UTS1_TXEMPTY (1<<6) |
| #define UTS1_RXEMPTY (1<<5) |
| #define UTS1_TXFULL (1<<4) |
| #define UTS1_RXFULL (1<<3) |
| |
| static void imx_update(IMXSerialState *s) |
| { |
| uint32_t flags; |
| |
| flags = (s->usr1 & s->ucr1) & (USR1_TRDY|USR1_RRDY); |
| if (!(s->ucr1 & UCR1_TXMPTYEN)) { |
| flags &= ~USR1_TRDY; |
| } |
| |
| qemu_set_irq(s->irq, !!flags); |
| } |
| |
| static void imx_serial_reset(IMXSerialState *s) |
| { |
| |
| s->usr1 = USR1_TRDY | USR1_RXDS; |
| /* |
| * Fake attachment of a terminal: assert RTS. |
| */ |
| s->usr1 |= USR1_RTSS; |
| s->usr2 = USR2_TXFE | USR2_TXDC | USR2_DCDIN; |
| s->uts1 = UTS1_RXEMPTY | UTS1_TXEMPTY; |
| s->ucr1 = 0; |
| s->ucr2 = UCR2_SRST; |
| s->ucr3 = 0x700; |
| s->ubmr = 0; |
| s->ubrc = 4; |
| s->readbuff = URXD_ERR; |
| } |
| |
| static void imx_serial_reset_at_boot(DeviceState *dev) |
| { |
| IMXSerialState *s = container_of(dev, IMXSerialState, busdev.qdev); |
| |
| imx_serial_reset(s); |
| |
| /* |
| * enable the uart on boot, so messages from the linux decompresser |
| * are visible. On real hardware this is done by the boot rom |
| * before anything else is loaded. |
| */ |
| s->ucr1 = UCR1_UARTEN; |
| s->ucr2 = UCR2_TXEN; |
| |
| } |
| |
| static uint64_t imx_serial_read(void *opaque, hwaddr offset, |
| unsigned size) |
| { |
| IMXSerialState *s = (IMXSerialState *)opaque; |
| uint32_t c; |
| |
| DPRINTF("read(offset=%x)\n", offset >> 2); |
| switch (offset >> 2) { |
| case 0x0: /* URXD */ |
| c = s->readbuff; |
| if (!(s->uts1 & UTS1_RXEMPTY)) { |
| /* Character is valid */ |
| c |= URXD_CHARRDY; |
| s->usr1 &= ~USR1_RRDY; |
| s->usr2 &= ~USR2_RDR; |
| s->uts1 |= UTS1_RXEMPTY; |
| imx_update(s); |
| qemu_chr_accept_input(s->chr); |
| } |
| return c; |
| |
| case 0x20: /* UCR1 */ |
| return s->ucr1; |
| |
| case 0x21: /* UCR2 */ |
| return s->ucr2; |
| |
| case 0x25: /* USR1 */ |
| return s->usr1; |
| |
| case 0x26: /* USR2 */ |
| return s->usr2; |
| |
| case 0x2A: /* BRM Modulator */ |
| return s->ubmr; |
| |
| case 0x2B: /* Baud Rate Count */ |
| return s->ubrc; |
| |
| case 0x2d: /* Test register */ |
| return s->uts1; |
| |
| case 0x24: /* UFCR */ |
| return s->ufcr; |
| |
| case 0x2c: |
| return s->onems; |
| |
| case 0x22: /* UCR3 */ |
| return s->ucr3; |
| |
| case 0x23: /* UCR4 */ |
| case 0x29: /* BRM Incremental */ |
| return 0x0; /* TODO */ |
| |
| default: |
| IPRINTF("imx_serial_read: bad offset: 0x%x\n", (int)offset); |
| return 0; |
| } |
| } |
| |
| static void imx_serial_write(void *opaque, hwaddr offset, |
| uint64_t value, unsigned size) |
| { |
| IMXSerialState *s = (IMXSerialState *)opaque; |
| unsigned char ch; |
| |
| DPRINTF("write(offset=%x, value = %x) to %s\n", |
| offset >> 2, |
| (unsigned int)value, s->chr ? s->chr->label : "NODEV"); |
| |
| switch (offset >> 2) { |
| case 0x10: /* UTXD */ |
| ch = value; |
| if (s->ucr2 & UCR2_TXEN) { |
| if (s->chr) { |
| qemu_chr_fe_write(s->chr, &ch, 1); |
| } |
| s->usr1 &= ~USR1_TRDY; |
| imx_update(s); |
| s->usr1 |= USR1_TRDY; |
| imx_update(s); |
| } |
| break; |
| |
| case 0x20: /* UCR1 */ |
| s->ucr1 = value & 0xffff; |
| DPRINTF("write(ucr1=%x)\n", (unsigned int)value); |
| imx_update(s); |
| break; |
| |
| case 0x21: /* UCR2 */ |
| /* |
| * Only a few bits in control register 2 are implemented as yet. |
| * If it's intended to use a real serial device as a back-end, this |
| * register will have to be implemented more fully. |
| */ |
| if (!(value & UCR2_SRST)) { |
| imx_serial_reset(s); |
| imx_update(s); |
| value |= UCR2_SRST; |
| } |
| if (value & UCR2_RXEN) { |
| if (!(s->ucr2 & UCR2_RXEN)) { |
| qemu_chr_accept_input(s->chr); |
| } |
| } |
| s->ucr2 = value & 0xffff; |
| break; |
| |
| case 0x25: /* USR1 */ |
| value &= USR1_AWAKE | USR1_AIRINT | USR1_DTRD | USR1_AGTIM | |
| USR1_FRAMERR | USR1_ESCF | USR1_RTSD | USR1_PARTYER; |
| s->usr1 &= ~value; |
| break; |
| |
| case 0x26: /* USR2 */ |
| /* |
| * Writing 1 to some bits clears them; all other |
| * values are ignored |
| */ |
| value &= USR2_ADET | USR2_DTRF | USR2_IDLE | USR2_ACST | |
| USR2_RIDELT | USR2_IRINT | USR2_WAKE | |
| USR2_DCDDELT | USR2_RTSF | USR2_BRCD | USR2_ORE; |
| s->usr2 &= ~value; |
| break; |
| |
| /* |
| * Linux expects to see what it writes to these registers |
| * We don't currently alter the baud rate |
| */ |
| case 0x29: /* UBIR */ |
| s->ubrc = value & 0xffff; |
| break; |
| |
| case 0x2a: /* UBMR */ |
| s->ubmr = value & 0xffff; |
| break; |
| |
| case 0x2c: /* One ms reg */ |
| s->onems = value & 0xffff; |
| break; |
| |
| case 0x24: /* FIFO control register */ |
| s->ufcr = value & 0xffff; |
| break; |
| |
| case 0x22: /* UCR3 */ |
| s->ucr3 = value & 0xffff; |
| break; |
| |
| case 0x2d: /* UTS1 */ |
| case 0x23: /* UCR4 */ |
| IPRINTF("Unimplemented Register %x written to\n", offset >> 2); |
| /* TODO */ |
| break; |
| |
| default: |
| IPRINTF("imx_serial_write: Bad offset 0x%x\n", (int)offset); |
| } |
| } |
| |
| static int imx_can_receive(void *opaque) |
| { |
| IMXSerialState *s = (IMXSerialState *)opaque; |
| return !(s->usr1 & USR1_RRDY); |
| } |
| |
| static void imx_put_data(void *opaque, uint32_t value) |
| { |
| IMXSerialState *s = (IMXSerialState *)opaque; |
| DPRINTF("received char\n"); |
| s->usr1 |= USR1_RRDY; |
| s->usr2 |= USR2_RDR; |
| s->uts1 &= ~UTS1_RXEMPTY; |
| s->readbuff = value; |
| imx_update(s); |
| } |
| |
| static void imx_receive(void *opaque, const uint8_t *buf, int size) |
| { |
| imx_put_data(opaque, *buf); |
| } |
| |
| static void imx_event(void *opaque, int event) |
| { |
| if (event == CHR_EVENT_BREAK) { |
| imx_put_data(opaque, URXD_BRK); |
| } |
| } |
| |
| |
| static const struct MemoryRegionOps imx_serial_ops = { |
| .read = imx_serial_read, |
| .write = imx_serial_write, |
| .endianness = DEVICE_NATIVE_ENDIAN, |
| }; |
| |
| static int imx_serial_init(SysBusDevice *dev) |
| { |
| IMXSerialState *s = FROM_SYSBUS(IMXSerialState, dev); |
| |
| |
| memory_region_init_io(&s->iomem, &imx_serial_ops, s, "imx-serial", 0x1000); |
| sysbus_init_mmio(dev, &s->iomem); |
| sysbus_init_irq(dev, &s->irq); |
| |
| if (s->chr) { |
| qemu_chr_add_handlers(s->chr, imx_can_receive, imx_receive, |
| imx_event, s); |
| } else { |
| DPRINTF("No char dev for uart at 0x%lx\n", |
| (unsigned long)s->iomem.ram_addr); |
| } |
| |
| return 0; |
| } |
| |
| void imx_serial_create(int uart, const hwaddr addr, qemu_irq irq) |
| { |
| DeviceState *dev; |
| SysBusDevice *bus; |
| CharDriverState *chr; |
| const char chr_name[] = "serial"; |
| char label[ARRAY_SIZE(chr_name) + 1]; |
| |
| dev = qdev_create(NULL, "imx-serial"); |
| |
| if (uart >= MAX_SERIAL_PORTS) { |
| hw_error("Cannot assign uart %d: QEMU supports only %d ports\n", |
| uart, MAX_SERIAL_PORTS); |
| } |
| chr = serial_hds[uart]; |
| if (!chr) { |
| snprintf(label, ARRAY_SIZE(label), "%s%d", chr_name, uart); |
| chr = qemu_chr_new(label, "null", NULL); |
| if (!(chr)) { |
| hw_error("Can't assign serial port to imx-uart%d.\n", uart); |
| } |
| } |
| |
| qdev_prop_set_chr(dev, "chardev", chr); |
| bus = sysbus_from_qdev(dev); |
| qdev_init_nofail(dev); |
| if (addr != (hwaddr)-1) { |
| sysbus_mmio_map(bus, 0, addr); |
| } |
| sysbus_connect_irq(bus, 0, irq); |
| |
| } |
| |
| |
| static Property imx32_serial_properties[] = { |
| DEFINE_PROP_CHR("chardev", IMXSerialState, chr), |
| DEFINE_PROP_END_OF_LIST(), |
| }; |
| |
| static void imx_serial_class_init(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); |
| |
| k->init = imx_serial_init; |
| dc->vmsd = &vmstate_imx_serial; |
| dc->reset = imx_serial_reset_at_boot; |
| dc->desc = "i.MX series UART"; |
| dc->props = imx32_serial_properties; |
| } |
| |
| static const TypeInfo imx_serial_info = { |
| .name = "imx-serial", |
| .parent = TYPE_SYS_BUS_DEVICE, |
| .instance_size = sizeof(IMXSerialState), |
| .class_init = imx_serial_class_init, |
| }; |
| |
| static void imx_serial_register_types(void) |
| { |
| type_register_static(&imx_serial_info); |
| } |
| |
| type_init(imx_serial_register_types) |
