diff options
Diffstat (limited to 'hw/char/stm32l4x5_usart.c')
| -rw-r--r-- | hw/char/stm32l4x5_usart.c | 637 |
1 files changed, 637 insertions, 0 deletions
diff --git a/hw/char/stm32l4x5_usart.c b/hw/char/stm32l4x5_usart.c new file mode 100644 index 0000000000..2627aab832 --- /dev/null +++ b/hw/char/stm32l4x5_usart.c @@ -0,0 +1,637 @@ +/* + * STM32L4X5 USART (Universal Synchronous Asynchronous Receiver Transmitter) + * + * Copyright (c) 2023 Arnaud Minier <arnaud.minier@telecom-paris.fr> + * Copyright (c) 2023 Inès Varhol <ines.varhol@telecom-paris.fr> + * + * SPDX-License-Identifier: GPL-2.0-or-later + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + * + * The STM32L4X5 USART is heavily inspired by the stm32f2xx_usart + * by Alistair Francis. + * The reference used is the STMicroElectronics RM0351 Reference manual + * for STM32L4x5 and STM32L4x6 advanced Arm ® -based 32-bit MCUs. + */ + +#include "qemu/osdep.h" +#include "qemu/log.h" +#include "qemu/module.h" +#include "qapi/error.h" +#include "chardev/char-fe.h" +#include "chardev/char-serial.h" +#include "migration/vmstate.h" +#include "hw/char/stm32l4x5_usart.h" +#include "hw/clock.h" +#include "hw/irq.h" +#include "hw/qdev-clock.h" +#include "hw/qdev-properties.h" +#include "hw/qdev-properties-system.h" +#include "hw/registerfields.h" +#include "trace.h" + + +REG32(CR1, 0x00) + FIELD(CR1, M1, 28, 1) /* Word length (part 2, see M0) */ + FIELD(CR1, EOBIE, 27, 1) /* End of Block interrupt enable */ + FIELD(CR1, RTOIE, 26, 1) /* Receiver timeout interrupt enable */ + FIELD(CR1, DEAT, 21, 5) /* Driver Enable assertion time */ + FIELD(CR1, DEDT, 16, 5) /* Driver Enable de-assertion time */ + FIELD(CR1, OVER8, 15, 1) /* Oversampling mode */ + FIELD(CR1, CMIE, 14, 1) /* Character match interrupt enable */ + FIELD(CR1, MME, 13, 1) /* Mute mode enable */ + FIELD(CR1, M0, 12, 1) /* Word length (part 1, see M1) */ + FIELD(CR1, WAKE, 11, 1) /* Receiver wakeup method */ + FIELD(CR1, PCE, 10, 1) /* Parity control enable */ + FIELD(CR1, PS, 9, 1) /* Parity selection */ + FIELD(CR1, PEIE, 8, 1) /* PE interrupt enable */ + FIELD(CR1, TXEIE, 7, 1) /* TXE interrupt enable */ + FIELD(CR1, TCIE, 6, 1) /* Transmission complete interrupt enable */ + FIELD(CR1, RXNEIE, 5, 1) /* RXNE interrupt enable */ + FIELD(CR1, IDLEIE, 4, 1) /* IDLE interrupt enable */ + FIELD(CR1, TE, 3, 1) /* Transmitter enable */ + FIELD(CR1, RE, 2, 1) /* Receiver enable */ + FIELD(CR1, UESM, 1, 1) /* USART enable in Stop mode */ + FIELD(CR1, UE, 0, 1) /* USART enable */ +REG32(CR2, 0x04) + FIELD(CR2, ADD_1, 28, 4) /* ADD[7:4] */ + FIELD(CR2, ADD_0, 24, 1) /* ADD[3:0] */ + FIELD(CR2, RTOEN, 23, 1) /* Receiver timeout enable */ + FIELD(CR2, ABRMOD, 21, 2) /* Auto baud rate mode */ + FIELD(CR2, ABREN, 20, 1) /* Auto baud rate enable */ + FIELD(CR2, MSBFIRST, 19, 1) /* Most significant bit first */ + FIELD(CR2, DATAINV, 18, 1) /* Binary data inversion */ + FIELD(CR2, TXINV, 17, 1) /* TX pin active level inversion */ + FIELD(CR2, RXINV, 16, 1) /* RX pin active level inversion */ + FIELD(CR2, SWAP, 15, 1) /* Swap RX/TX pins */ + FIELD(CR2, LINEN, 14, 1) /* LIN mode enable */ + FIELD(CR2, STOP, 12, 2) /* STOP bits */ + FIELD(CR2, CLKEN, 11, 1) /* Clock enable */ + FIELD(CR2, CPOL, 10, 1) /* Clock polarity */ + FIELD(CR2, CPHA, 9, 1) /* Clock phase */ + FIELD(CR2, LBCL, 8, 1) /* Last bit clock pulse */ + FIELD(CR2, LBDIE, 6, 1) /* LIN break detection interrupt enable */ + FIELD(CR2, LBDL, 5, 1) /* LIN break detection length */ + FIELD(CR2, ADDM7, 4, 1) /* 7-bit / 4-bit Address Detection */ + +REG32(CR3, 0x08) + /* TCBGTIE only on STM32L496xx/4A6xx devices */ + FIELD(CR3, UCESM, 23, 1) /* USART Clock Enable in Stop Mode */ + FIELD(CR3, WUFIE, 22, 1) /* Wakeup from Stop mode interrupt enable */ + FIELD(CR3, WUS, 20, 2) /* Wakeup from Stop mode interrupt flag selection */ + FIELD(CR3, SCARCNT, 17, 3) /* Smartcard auto-retry count */ + FIELD(CR3, DEP, 15, 1) /* Driver enable polarity selection */ + FIELD(CR3, DEM, 14, 1) /* Driver enable mode */ + FIELD(CR3, DDRE, 13, 1) /* DMA Disable on Reception Error */ + FIELD(CR3, OVRDIS, 12, 1) /* Overrun Disable */ + FIELD(CR3, ONEBIT, 11, 1) /* One sample bit method enable */ + FIELD(CR3, CTSIE, 10, 1) /* CTS interrupt enable */ + FIELD(CR3, CTSE, 9, 1) /* CTS enable */ + FIELD(CR3, RTSE, 8, 1) /* RTS enable */ + FIELD(CR3, DMAT, 7, 1) /* DMA enable transmitter */ + FIELD(CR3, DMAR, 6, 1) /* DMA enable receiver */ + FIELD(CR3, SCEN, 5, 1) /* Smartcard mode enable */ + FIELD(CR3, NACK, 4, 1) /* Smartcard NACK enable */ + FIELD(CR3, HDSEL, 3, 1) /* Half-duplex selection */ + FIELD(CR3, IRLP, 2, 1) /* IrDA low-power */ + FIELD(CR3, IREN, 1, 1) /* IrDA mode enable */ + FIELD(CR3, EIE, 0, 1) /* Error interrupt enable */ +REG32(BRR, 0x0C) + FIELD(BRR, BRR, 0, 16) +REG32(GTPR, 0x10) + FIELD(GTPR, GT, 8, 8) /* Guard time value */ + FIELD(GTPR, PSC, 0, 8) /* Prescaler value */ +REG32(RTOR, 0x14) + FIELD(RTOR, BLEN, 24, 8) /* Block Length */ + FIELD(RTOR, RTO, 0, 24) /* Receiver timeout value */ +REG32(RQR, 0x18) + FIELD(RQR, TXFRQ, 4, 1) /* Transmit data flush request */ + FIELD(RQR, RXFRQ, 3, 1) /* Receive data flush request */ + FIELD(RQR, MMRQ, 2, 1) /* Mute mode request */ + FIELD(RQR, SBKRQ, 1, 1) /* Send break request */ + FIELD(RQR, ABBRRQ, 0, 1) /* Auto baud rate request */ +REG32(ISR, 0x1C) + /* TCBGT only for STM32L475xx/476xx/486xx devices */ + FIELD(ISR, REACK, 22, 1) /* Receive enable acknowledge flag */ + FIELD(ISR, TEACK, 21, 1) /* Transmit enable acknowledge flag */ + FIELD(ISR, WUF, 20, 1) /* Wakeup from Stop mode flag */ + FIELD(ISR, RWU, 19, 1) /* Receiver wakeup from Mute mode */ + FIELD(ISR, SBKF, 18, 1) /* Send break flag */ + FIELD(ISR, CMF, 17, 1) /* Character match flag */ + FIELD(ISR, BUSY, 16, 1) /* Busy flag */ + FIELD(ISR, ABRF, 15, 1) /* Auto Baud rate flag */ + FIELD(ISR, ABRE, 14, 1) /* Auto Baud rate error */ + FIELD(ISR, EOBF, 12, 1) /* End of block flag */ + FIELD(ISR, RTOF, 11, 1) /* Receiver timeout */ + FIELD(ISR, CTS, 10, 1) /* CTS flag */ + FIELD(ISR, CTSIF, 9, 1) /* CTS interrupt flag */ + FIELD(ISR, LBDF, 8, 1) /* LIN break detection flag */ + FIELD(ISR, TXE, 7, 1) /* Transmit data register empty */ + FIELD(ISR, TC, 6, 1) /* Transmission complete */ + FIELD(ISR, RXNE, 5, 1) /* Read data register not empty */ + FIELD(ISR, IDLE, 4, 1) /* Idle line detected */ + FIELD(ISR, ORE, 3, 1) /* Overrun error */ + FIELD(ISR, NF, 2, 1) /* START bit Noise detection flag */ + FIELD(ISR, FE, 1, 1) /* Framing Error */ + FIELD(ISR, PE, 0, 1) /* Parity Error */ +REG32(ICR, 0x20) + FIELD(ICR, WUCF, 20, 1) /* Wakeup from Stop mode clear flag */ + FIELD(ICR, CMCF, 17, 1) /* Character match clear flag */ + FIELD(ICR, EOBCF, 12, 1) /* End of block clear flag */ + FIELD(ICR, RTOCF, 11, 1) /* Receiver timeout clear flag */ + FIELD(ICR, CTSCF, 9, 1) /* CTS clear flag */ + FIELD(ICR, LBDCF, 8, 1) /* LIN break detection clear flag */ + /* TCBGTCF only on STM32L496xx/4A6xx devices */ + FIELD(ICR, TCCF, 6, 1) /* Transmission complete clear flag */ + FIELD(ICR, IDLECF, 4, 1) /* Idle line detected clear flag */ + FIELD(ICR, ORECF, 3, 1) /* Overrun error clear flag */ + FIELD(ICR, NCF, 2, 1) /* Noise detected clear flag */ + FIELD(ICR, FECF, 1, 1) /* Framing error clear flag */ + FIELD(ICR, PECF, 0, 1) /* Parity error clear flag */ +REG32(RDR, 0x24) + FIELD(RDR, RDR, 0, 9) +REG32(TDR, 0x28) + FIELD(TDR, TDR, 0, 9) + +static void stm32l4x5_update_irq(Stm32l4x5UsartBaseState *s) +{ + if (((s->isr & R_ISR_WUF_MASK) && (s->cr3 & R_CR3_WUFIE_MASK)) || + ((s->isr & R_ISR_CMF_MASK) && (s->cr1 & R_CR1_CMIE_MASK)) || + ((s->isr & R_ISR_ABRF_MASK) && (s->cr1 & R_CR1_RXNEIE_MASK)) || + ((s->isr & R_ISR_EOBF_MASK) && (s->cr1 & R_CR1_EOBIE_MASK)) || + ((s->isr & R_ISR_RTOF_MASK) && (s->cr1 & R_CR1_RTOIE_MASK)) || + ((s->isr & R_ISR_CTSIF_MASK) && (s->cr3 & R_CR3_CTSIE_MASK)) || + ((s->isr & R_ISR_LBDF_MASK) && (s->cr2 & R_CR2_LBDIE_MASK)) || + ((s->isr & R_ISR_TXE_MASK) && (s->cr1 & R_CR1_TXEIE_MASK)) || + ((s->isr & R_ISR_TC_MASK) && (s->cr1 & R_CR1_TCIE_MASK)) || + ((s->isr & R_ISR_RXNE_MASK) && (s->cr1 & R_CR1_RXNEIE_MASK)) || + ((s->isr & R_ISR_IDLE_MASK) && (s->cr1 & R_CR1_IDLEIE_MASK)) || + ((s->isr & R_ISR_ORE_MASK) && + ((s->cr1 & R_CR1_RXNEIE_MASK) || (s->cr3 & R_CR3_EIE_MASK))) || + /* TODO: Handle NF ? */ + ((s->isr & R_ISR_FE_MASK) && (s->cr3 & R_CR3_EIE_MASK)) || + ((s->isr & R_ISR_PE_MASK) && (s->cr1 & R_CR1_PEIE_MASK))) { + qemu_irq_raise(s->irq); + trace_stm32l4x5_usart_irq_raised(s->isr); + } else { + qemu_irq_lower(s->irq); + trace_stm32l4x5_usart_irq_lowered(); + } +} + +static int stm32l4x5_usart_base_can_receive(void *opaque) +{ + Stm32l4x5UsartBaseState *s = opaque; + + if (!(s->isr & R_ISR_RXNE_MASK)) { + return 1; + } + + return 0; +} + +static void stm32l4x5_usart_base_receive(void *opaque, const uint8_t *buf, + int size) +{ + Stm32l4x5UsartBaseState *s = opaque; + + if (!((s->cr1 & R_CR1_UE_MASK) && (s->cr1 & R_CR1_RE_MASK))) { + trace_stm32l4x5_usart_receiver_not_enabled( + FIELD_EX32(s->cr1, CR1, UE), FIELD_EX32(s->cr1, CR1, RE)); + return; + } + + /* Check if overrun detection is enabled and if there is an overrun */ + if (!(s->cr3 & R_CR3_OVRDIS_MASK) && (s->isr & R_ISR_RXNE_MASK)) { + /* + * A character has been received while + * the previous has not been read = Overrun. + */ + s->isr |= R_ISR_ORE_MASK; + trace_stm32l4x5_usart_overrun_detected(s->rdr, *buf); + } else { + /* No overrun */ + s->rdr = *buf; + s->isr |= R_ISR_RXNE_MASK; + trace_stm32l4x5_usart_rx(s->rdr); + } + + stm32l4x5_update_irq(s); +} + +/* + * Try to send tx data, and arrange to be called back later if + * we can't (ie the char backend is busy/blocking). + */ +static gboolean usart_transmit(void *do_not_use, GIOCondition cond, + void *opaque) +{ + Stm32l4x5UsartBaseState *s = STM32L4X5_USART_BASE(opaque); + int ret; + /* TODO: Handle 9 bits transmission */ + uint8_t ch = s->tdr; + + s->watch_tag = 0; + + if (!(s->cr1 & R_CR1_TE_MASK) || (s->isr & R_ISR_TXE_MASK)) { + return G_SOURCE_REMOVE; + } + + ret = qemu_chr_fe_write(&s->chr, &ch, 1); + if (ret <= 0) { + s->watch_tag = qemu_chr_fe_add_watch(&s->chr, G_IO_OUT | G_IO_HUP, + usart_transmit, s); + if (!s->watch_tag) { + /* + * Most common reason to be here is "no chardev backend": + * just insta-drain the buffer, so the serial output + * goes into a void, rather than blocking the guest. + */ + goto buffer_drained; + } + /* Transmit pending */ + trace_stm32l4x5_usart_tx_pending(); + return G_SOURCE_REMOVE; + } + +buffer_drained: + /* Character successfully sent */ + trace_stm32l4x5_usart_tx(ch); + s->isr |= R_ISR_TC_MASK | R_ISR_TXE_MASK; + stm32l4x5_update_irq(s); + return G_SOURCE_REMOVE; +} + +static void usart_cancel_transmit(Stm32l4x5UsartBaseState *s) +{ + if (s->watch_tag) { + g_source_remove(s->watch_tag); + s->watch_tag = 0; + } +} + +static void stm32l4x5_update_params(Stm32l4x5UsartBaseState *s) +{ + int speed, parity, data_bits, stop_bits; + uint32_t value, usart_div; + QEMUSerialSetParams ssp; + + /* Select the parity type */ + if (s->cr1 & R_CR1_PCE_MASK) { + if (s->cr1 & R_CR1_PS_MASK) { + parity = 'O'; + } else { + parity = 'E'; + } + } else { + parity = 'N'; + } + + /* Select the number of stop bits */ + switch (FIELD_EX32(s->cr2, CR2, STOP)) { + case 0: + stop_bits = 1; + break; + case 2: + stop_bits = 2; + break; + default: + qemu_log_mask(LOG_UNIMP, + "UNIMPLEMENTED: fractionnal stop bits; CR2[13:12] = %u", + FIELD_EX32(s->cr2, CR2, STOP)); + return; + } + + /* Select the length of the word */ + switch ((FIELD_EX32(s->cr1, CR1, M1) << 1) | FIELD_EX32(s->cr1, CR1, M0)) { + case 0: + data_bits = 8; + break; + case 1: + data_bits = 9; + break; + case 2: + data_bits = 7; + break; + default: + qemu_log_mask(LOG_GUEST_ERROR, + "UNDEFINED: invalid word length, CR1.M = 0b11"); + return; + } + + /* Select the baud rate */ + value = FIELD_EX32(s->brr, BRR, BRR); + if (value < 16) { + qemu_log_mask(LOG_GUEST_ERROR, + "UNDEFINED: BRR less than 16: %u", value); + return; + } + + if (FIELD_EX32(s->cr1, CR1, OVER8) == 0) { + /* + * Oversampling by 16 + * BRR = USARTDIV + */ + usart_div = value; + } else { + /* + * Oversampling by 8 + * - BRR[2:0] = USARTDIV[3:0] shifted 1 bit to the right. + * - BRR[3] must be kept cleared. + * - BRR[15:4] = USARTDIV[15:4] + * - The frequency is multiplied by 2 + */ + usart_div = ((value & 0xFFF0) | ((value & 0x0007) << 1)) / 2; + } + + speed = clock_get_hz(s->clk) / usart_div; + + ssp.speed = speed; + ssp.parity = parity; + ssp.data_bits = data_bits; + ssp.stop_bits = stop_bits; + + qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp); + + trace_stm32l4x5_usart_update_params(speed, parity, data_bits, stop_bits); +} + +static void stm32l4x5_usart_base_reset_hold(Object *obj, ResetType type) +{ + Stm32l4x5UsartBaseState *s = STM32L4X5_USART_BASE(obj); + + s->cr1 = 0x00000000; + s->cr2 = 0x00000000; + s->cr3 = 0x00000000; + s->brr = 0x00000000; + s->gtpr = 0x00000000; + s->rtor = 0x00000000; + s->isr = 0x020000C0; + s->rdr = 0x00000000; + s->tdr = 0x00000000; + + usart_cancel_transmit(s); + stm32l4x5_update_irq(s); +} + +static void usart_update_rqr(Stm32l4x5UsartBaseState *s, uint32_t value) +{ + /* TXFRQ */ + /* Reset RXNE flag */ + if (value & R_RQR_RXFRQ_MASK) { + s->isr &= ~R_ISR_RXNE_MASK; + } + /* MMRQ */ + /* SBKRQ */ + /* ABRRQ */ + stm32l4x5_update_irq(s); +} + +static uint64_t stm32l4x5_usart_base_read(void *opaque, hwaddr addr, + unsigned int size) +{ + Stm32l4x5UsartBaseState *s = opaque; + uint64_t retvalue = 0; + + switch (addr) { + case A_CR1: + retvalue = s->cr1; + break; + case A_CR2: + retvalue = s->cr2; + break; + case A_CR3: + retvalue = s->cr3; + break; + case A_BRR: + retvalue = FIELD_EX32(s->brr, BRR, BRR); + break; + case A_GTPR: + retvalue = s->gtpr; + break; + case A_RTOR: + retvalue = s->rtor; + break; + case A_RQR: + /* RQR is a write only register */ + retvalue = 0x00000000; + break; + case A_ISR: + retvalue = s->isr; + break; + case A_ICR: + /* ICR is a clear register */ + retvalue = 0x00000000; + break; + case A_RDR: + retvalue = FIELD_EX32(s->rdr, RDR, RDR); + /* Reset RXNE flag */ + s->isr &= ~R_ISR_RXNE_MASK; + stm32l4x5_update_irq(s); + break; + case A_TDR: + retvalue = FIELD_EX32(s->tdr, TDR, TDR); + break; + default: + qemu_log_mask(LOG_GUEST_ERROR, + "%s: Bad offset 0x%"HWADDR_PRIx"\n", __func__, addr); + break; + } + + trace_stm32l4x5_usart_read(addr, retvalue); + + return retvalue; +} + +static void stm32l4x5_usart_base_write(void *opaque, hwaddr addr, + uint64_t val64, unsigned int size) +{ + Stm32l4x5UsartBaseState *s = opaque; + const uint32_t value = val64; + + trace_stm32l4x5_usart_write(addr, value); + + switch (addr) { + case A_CR1: + s->cr1 = value; + stm32l4x5_update_params(s); + stm32l4x5_update_irq(s); + return; + case A_CR2: + s->cr2 = value; + stm32l4x5_update_params(s); + return; + case A_CR3: + s->cr3 = value; + return; + case A_BRR: + s->brr = value; + stm32l4x5_update_params(s); + return; + case A_GTPR: + s->gtpr = value; + return; + case A_RTOR: + s->rtor = value; + return; + case A_RQR: + usart_update_rqr(s, value); + return; + case A_ISR: + qemu_log_mask(LOG_GUEST_ERROR, + "%s: ISR is read only !\n", __func__); + return; + case A_ICR: + /* Clear the status flags */ + s->isr &= ~value; + stm32l4x5_update_irq(s); + return; + case A_RDR: + qemu_log_mask(LOG_GUEST_ERROR, + "%s: RDR is read only !\n", __func__); + return; + case A_TDR: + s->tdr = value; + s->isr &= ~R_ISR_TXE_MASK; + usart_transmit(NULL, G_IO_OUT, s); + return; + default: + qemu_log_mask(LOG_GUEST_ERROR, + "%s: Bad offset 0x%"HWADDR_PRIx"\n", __func__, addr); + } +} + +static const MemoryRegionOps stm32l4x5_usart_base_ops = { + .read = stm32l4x5_usart_base_read, + .write = stm32l4x5_usart_base_write, + .endianness = DEVICE_NATIVE_ENDIAN, + .valid = { + .max_access_size = 4, + .min_access_size = 4, + .unaligned = false + }, + .impl = { + .max_access_size = 4, + .min_access_size = 4, + .unaligned = false + }, +}; + +static Property stm32l4x5_usart_base_properties[] = { + DEFINE_PROP_CHR("chardev", Stm32l4x5UsartBaseState, chr), + DEFINE_PROP_END_OF_LIST(), +}; + +static void stm32l4x5_usart_base_init(Object *obj) +{ + Stm32l4x5UsartBaseState *s = STM32L4X5_USART_BASE(obj); + + sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq); + + memory_region_init_io(&s->mmio, obj, &stm32l4x5_usart_base_ops, s, + TYPE_STM32L4X5_USART_BASE, 0x400); + sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio); + + s->clk = qdev_init_clock_in(DEVICE(s), "clk", NULL, s, 0); +} + +static int stm32l4x5_usart_base_post_load(void *opaque, int version_id) +{ + Stm32l4x5UsartBaseState *s = (Stm32l4x5UsartBaseState *)opaque; + + stm32l4x5_update_params(s); + return 0; +} + +static const VMStateDescription vmstate_stm32l4x5_usart_base = { + .name = TYPE_STM32L4X5_USART_BASE, + .version_id = 1, + .minimum_version_id = 1, + .post_load = stm32l4x5_usart_base_post_load, + .fields = (VMStateField[]) { + VMSTATE_UINT32(cr1, Stm32l4x5UsartBaseState), + VMSTATE_UINT32(cr2, Stm32l4x5UsartBaseState), + VMSTATE_UINT32(cr3, Stm32l4x5UsartBaseState), + VMSTATE_UINT32(brr, Stm32l4x5UsartBaseState), + VMSTATE_UINT32(gtpr, Stm32l4x5UsartBaseState), + VMSTATE_UINT32(rtor, Stm32l4x5UsartBaseState), + VMSTATE_UINT32(isr, Stm32l4x5UsartBaseState), + VMSTATE_UINT32(rdr, Stm32l4x5UsartBaseState), + VMSTATE_UINT32(tdr, Stm32l4x5UsartBaseState), + VMSTATE_CLOCK(clk, Stm32l4x5UsartBaseState), + VMSTATE_END_OF_LIST() + } +}; + + +static void stm32l4x5_usart_base_realize(DeviceState *dev, Error **errp) +{ + ERRP_GUARD(); + Stm32l4x5UsartBaseState *s = STM32L4X5_USART_BASE(dev); + if (!clock_has_source(s->clk)) { + error_setg(errp, "USART clock must be wired up by SoC code"); + return; + } + + qemu_chr_fe_set_handlers(&s->chr, stm32l4x5_usart_base_can_receive, + stm32l4x5_usart_base_receive, NULL, NULL, + s, NULL, true); +} + +static void stm32l4x5_usart_base_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + ResettableClass *rc = RESETTABLE_CLASS(klass); + + rc->phases.hold = stm32l4x5_usart_base_reset_hold; + device_class_set_props(dc, stm32l4x5_usart_base_properties); + dc->realize = stm32l4x5_usart_base_realize; + dc->vmsd = &vmstate_stm32l4x5_usart_base; +} + +static void stm32l4x5_usart_class_init(ObjectClass *oc, void *data) +{ + Stm32l4x5UsartBaseClass *subc = STM32L4X5_USART_BASE_CLASS(oc); + + subc->type = STM32L4x5_USART; +} + +static void stm32l4x5_uart_class_init(ObjectClass *oc, void *data) +{ + Stm32l4x5UsartBaseClass *subc = STM32L4X5_USART_BASE_CLASS(oc); + + subc->type = STM32L4x5_UART; +} + +static void stm32l4x5_lpuart_class_init(ObjectClass *oc, void *data) +{ + Stm32l4x5UsartBaseClass *subc = STM32L4X5_USART_BASE_CLASS(oc); + + subc->type = STM32L4x5_LPUART; +} + +static const TypeInfo stm32l4x5_usart_types[] = { + { + .name = TYPE_STM32L4X5_USART_BASE, + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(Stm32l4x5UsartBaseState), + .instance_init = stm32l4x5_usart_base_init, + .class_init = stm32l4x5_usart_base_class_init, + .abstract = true, + }, { + .name = TYPE_STM32L4X5_USART, + .parent = TYPE_STM32L4X5_USART_BASE, + .class_init = stm32l4x5_usart_class_init, + }, { + .name = TYPE_STM32L4X5_UART, + .parent = TYPE_STM32L4X5_USART_BASE, + .class_init = stm32l4x5_uart_class_init, + }, { + .name = TYPE_STM32L4X5_LPUART, + .parent = TYPE_STM32L4X5_USART_BASE, + .class_init = stm32l4x5_lpuart_class_init, + } +}; + +DEFINE_TYPES(stm32l4x5_usart_types) |