diff options
Diffstat (limited to 'hw/imx_serial.c')
| -rw-r--r-- | hw/imx_serial.c | 467 |
1 files changed, 0 insertions, 467 deletions
diff --git a/hw/imx_serial.c b/hw/imx_serial.c deleted file mode 100644 index 746723cd6e..0000000000 --- a/hw/imx_serial.c +++ /dev/null @@ -1,467 +0,0 @@ -/* - * 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/hw.h" -#include "hw/sysbus.h" -#include "sysemu/sysemu.h" -#include "char/char.h" -#include "hw/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 = SYS_BUS_DEVICE(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) |