| Message ID | ba270f9d6d722d7430b947c5eb69a129271eaf19.1410682231.git.alistair23@gmail.com |
|---|---|
| State | New |
| Headers | show |
On Sun, Sep 14, 2014 at 6:18 PM, Alistair Francis <alistair23@gmail.com> wrote: > This patch adds the stm32f205 USART controller > (UART also uses the same controller). > > Signed-off-by: Alistair Francis <alistair23@gmail.com> > --- > Changes from RFC: > - Small changes thanks to Peter C > - USART now implements QEMU blocking functions > - Split the config settings to device level > > default-configs/arm-softmmu.mak | 1 + > hw/char/Makefile.objs | 1 + > hw/char/stm32f205_usart.c | 213 ++++++++++++++++++++++++++++++++++++++ > include/hw/char/stm32f205_usart.h | 67 ++++++++++++ > 4 files changed, 282 insertions(+) > create mode 100644 hw/char/stm32f205_usart.c > create mode 100644 include/hw/char/stm32f205_usart.h > > diff --git a/default-configs/arm-softmmu.mak b/default-configs/arm-softmmu.mak > index cf23b24..422dec0 100644 > --- a/default-configs/arm-softmmu.mak > +++ b/default-configs/arm-softmmu.mak > @@ -79,6 +79,7 @@ CONFIG_REALVIEW=y > CONFIG_ZAURUS=y > CONFIG_ZYNQ=y > CONFIG_STM32F205_TIMER=y > +CONFIG_STM32F205_USART=y > > CONFIG_VERSATILE_PCI=y > CONFIG_VERSATILE_I2C=y > diff --git a/hw/char/Makefile.objs b/hw/char/Makefile.objs > index 317385d..c7b3ce4 100644 > --- a/hw/char/Makefile.objs > +++ b/hw/char/Makefile.objs > @@ -15,6 +15,7 @@ obj-$(CONFIG_OMAP) += omap_uart.o > obj-$(CONFIG_SH4) += sh_serial.o > obj-$(CONFIG_PSERIES) += spapr_vty.o > obj-$(CONFIG_DIGIC) += digic-uart.o > +obj-$(CONFIG_STM32F205_USART) += stm32f205_usart.o > > common-obj-$(CONFIG_ETRAXFS) += etraxfs_ser.o > common-obj-$(CONFIG_ISA_DEBUG) += debugcon.o > diff --git a/hw/char/stm32f205_usart.c b/hw/char/stm32f205_usart.c > new file mode 100644 > index 0000000..1274e69 > --- /dev/null > +++ b/hw/char/stm32f205_usart.c > @@ -0,0 +1,213 @@ > +/* > + * STM32F205 USART > + * > + * Copyright (c) 2014 Alistair Francis <alistair@alistair23.me> > + * > + * Permission is hereby granted, free of charge, to any person obtaining a copy > + * of this software and associated documentation files (the "Software"), to deal > + * in the Software without restriction, including without limitation the rights > + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell > + * copies of the Software, and to permit persons to whom the Software is > + * furnished to do so, subject to the following conditions: > + * > + * The above copyright notice and this permission notice shall be included in > + * all copies or substantial portions of the Software. > + * > + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR > + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, > + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL > + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER > + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, > + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN > + * THE SOFTWARE. > + */ > + > +#include "hw/char/stm32f205_usart.h" > + > +#ifndef STM_USART_ERR_DEBUG > +#define STM_USART_ERR_DEBUG 0 > +#endif > + > +#define DB_PRINT_L(lvl, fmt, args...) do { \ > + if (STM_USART_ERR_DEBUG >= lvl) { \ > + qemu_log("stm32f205_usart: %s:" fmt, __func__, ## args); \ > + } \ > +} while (0); > + > +#define DB_PRINT(fmt, args...) DB_PRINT_L(1, fmt, ## args) > + > +static int stm32f205_usart_can_receive(void *opaque) > +{ > + STM32f205UsartState *s = opaque; > + > + if (s->usart_cr1 & USART_CR1_UE && s->usart_cr1 & USART_CR1_RE && So this is still gating based on the master enable. I think these first two terms in the && need to be dropped ... > + !(s->usart_sr & USART_SR_RXNE)) { > + return 1; > + } > + > + return 0; > +} > + > +static void stm32f205_usart_receive(void *opaque, const uint8_t *buf, int size) > +{ > + STM32f205UsartState *s = opaque; > + > + s->usart_dr = *buf; > + and here: if (!s->usart_cr1 & USART_CR1_UE && s->usart_cr1 & USART_CR1_RE) { return; /* not enabled - drop chars */ } This means the UART will drop chars when its disabled, which would be consistent with real HW (there is no buffering when the sender sends chars to a disabled UART). > + s->usart_sr |= USART_SR_RXNE; > + > + if (s->usart_cr1 & USART_CR1_RXNEIE) { > + qemu_set_irq(s->irq, 1); > + } > + > + DB_PRINT("Receiving: %c\n", s->usart_dr); > +} > + > +static void stm32f205_usart_reset(DeviceState *dev) > +{ > + STM32f205UsartState *s = STM32F205_USART(dev); > + > + s->usart_sr = 0x00C00000; Just define a macro for this field and set it for self documentation. > + s->usart_dr = 0x00000000; > + s->usart_brr = 0x00000000; > + s->usart_cr1 = 0x00000000; > + s->usart_cr2 = 0x00000000; > + s->usart_cr3 = 0x00000000; > + s->usart_gtpr = 0x00000000; > +} > + > +static uint64_t stm32f205_usart_read(void *opaque, hwaddr addr, > + unsigned int size) > +{ > + STM32f205UsartState *s = opaque; > + uint64_t retvalue; > + > + DB_PRINT("Read 0x%"HWADDR_PRIx"\n", addr); > + > + switch (addr) { > + case USART_SR: > + retvalue = s->usart_sr; > + s->usart_sr &= ~USART_SR_TC; > + if (s->chr) { > + qemu_chr_accept_input(s->chr); > + } > + return retvalue; > + case USART_DR: > + DB_PRINT("Value: 0x%x, %c\n", s->usart_dr, (char) s->usart_dr); PRIx32 to match type of usart_dr. > + s->usart_sr |= USART_SR_TXE; > + s->usart_sr &= ~USART_SR_RXNE; > + return s->usart_dr & 0x3FF; > + case USART_BRR: > + return s->usart_brr; > + case USART_CR1: > + return s->usart_cr1; > + case USART_CR2: > + return s->usart_cr2; > + case USART_CR3: > + return s->usart_cr3; > + case USART_GTPR: > + return s->usart_gtpr; > + default: > + qemu_log_mask(LOG_GUEST_ERROR, > + "STM32F205_usart_read: Bad offset " \ > + "0x%"HWADDR_PRIx"\n", addr); > + return 0; > + } > + > + return 0; > +} > + > +static void stm32f205_usart_write(void *opaque, hwaddr addr, > + uint64_t val64, unsigned int size) > +{ > + STM32f205UsartState *s = opaque; > + uint32_t value = val64; > + unsigned char ch; > + > + DB_PRINT("Write 0x%x, 0x%"HWADDR_PRIx"\n", value, addr); > + PRIx64 for value. Regards, Peter
On Tue, Sep 16, 2014 at 1:11 AM, Peter Crosthwaite <peter.crosthwaite@xilinx.com> wrote: > On Sun, Sep 14, 2014 at 6:18 PM, Alistair Francis <alistair23@gmail.com> wrote: >> This patch adds the stm32f205 USART controller >> (UART also uses the same controller). >> >> Signed-off-by: Alistair Francis <alistair23@gmail.com> >> --- >> Changes from RFC: >> - Small changes thanks to Peter C >> - USART now implements QEMU blocking functions >> - Split the config settings to device level >> >> default-configs/arm-softmmu.mak | 1 + >> hw/char/Makefile.objs | 1 + >> hw/char/stm32f205_usart.c | 213 ++++++++++++++++++++++++++++++++++++++ >> include/hw/char/stm32f205_usart.h | 67 ++++++++++++ >> 4 files changed, 282 insertions(+) >> create mode 100644 hw/char/stm32f205_usart.c >> create mode 100644 include/hw/char/stm32f205_usart.h >> >> diff --git a/default-configs/arm-softmmu.mak b/default-configs/arm-softmmu.mak >> index cf23b24..422dec0 100644 >> --- a/default-configs/arm-softmmu.mak >> +++ b/default-configs/arm-softmmu.mak >> @@ -79,6 +79,7 @@ CONFIG_REALVIEW=y >> CONFIG_ZAURUS=y >> CONFIG_ZYNQ=y >> CONFIG_STM32F205_TIMER=y >> +CONFIG_STM32F205_USART=y >> >> CONFIG_VERSATILE_PCI=y >> CONFIG_VERSATILE_I2C=y >> diff --git a/hw/char/Makefile.objs b/hw/char/Makefile.objs >> index 317385d..c7b3ce4 100644 >> --- a/hw/char/Makefile.objs >> +++ b/hw/char/Makefile.objs >> @@ -15,6 +15,7 @@ obj-$(CONFIG_OMAP) += omap_uart.o >> obj-$(CONFIG_SH4) += sh_serial.o >> obj-$(CONFIG_PSERIES) += spapr_vty.o >> obj-$(CONFIG_DIGIC) += digic-uart.o >> +obj-$(CONFIG_STM32F205_USART) += stm32f205_usart.o >> >> common-obj-$(CONFIG_ETRAXFS) += etraxfs_ser.o >> common-obj-$(CONFIG_ISA_DEBUG) += debugcon.o >> diff --git a/hw/char/stm32f205_usart.c b/hw/char/stm32f205_usart.c >> new file mode 100644 >> index 0000000..1274e69 >> --- /dev/null >> +++ b/hw/char/stm32f205_usart.c >> @@ -0,0 +1,213 @@ >> +/* >> + * STM32F205 USART >> + * >> + * Copyright (c) 2014 Alistair Francis <alistair@alistair23.me> >> + * >> + * Permission is hereby granted, free of charge, to any person obtaining a copy >> + * of this software and associated documentation files (the "Software"), to deal >> + * in the Software without restriction, including without limitation the rights >> + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell >> + * copies of the Software, and to permit persons to whom the Software is >> + * furnished to do so, subject to the following conditions: >> + * >> + * The above copyright notice and this permission notice shall be included in >> + * all copies or substantial portions of the Software. >> + * >> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR >> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, >> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL >> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER >> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, >> + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN >> + * THE SOFTWARE. >> + */ >> + >> +#include "hw/char/stm32f205_usart.h" >> + >> +#ifndef STM_USART_ERR_DEBUG >> +#define STM_USART_ERR_DEBUG 0 >> +#endif >> + >> +#define DB_PRINT_L(lvl, fmt, args...) do { \ >> + if (STM_USART_ERR_DEBUG >= lvl) { \ >> + qemu_log("stm32f205_usart: %s:" fmt, __func__, ## args); \ >> + } \ >> +} while (0); >> + >> +#define DB_PRINT(fmt, args...) DB_PRINT_L(1, fmt, ## args) >> + >> +static int stm32f205_usart_can_receive(void *opaque) >> +{ >> + STM32f205UsartState *s = opaque; >> + >> + if (s->usart_cr1 & USART_CR1_UE && s->usart_cr1 & USART_CR1_RE && > > So this is still gating based on the master enable. I think these > first two terms in the && need to be dropped ... > >> + !(s->usart_sr & USART_SR_RXNE)) { >> + return 1; >> + } >> + >> + return 0; >> +} >> + >> +static void stm32f205_usart_receive(void *opaque, const uint8_t *buf, int size) >> +{ >> + STM32f205UsartState *s = opaque; >> + >> + s->usart_dr = *buf; >> + > > and here: > > if (!s->usart_cr1 & USART_CR1_UE && s->usart_cr1 & USART_CR1_RE) { > return; /* not enabled - drop chars */ > } > > This means the UART will drop chars when its disabled, which would be > consistent with real HW (there is no buffering when the sender sends > chars to a disabled UART). This makes sense, will fix it Thanks, Alistair > >> + s->usart_sr |= USART_SR_RXNE; >> + >> + if (s->usart_cr1 & USART_CR1_RXNEIE) { >> + qemu_set_irq(s->irq, 1); >> + } >> + >> + DB_PRINT("Receiving: %c\n", s->usart_dr); >> +} >> + >> +static void stm32f205_usart_reset(DeviceState *dev) >> +{ >> + STM32f205UsartState *s = STM32F205_USART(dev); >> + >> + s->usart_sr = 0x00C00000; > > Just define a macro for this field and set it for self documentation. > >> + s->usart_dr = 0x00000000; >> + s->usart_brr = 0x00000000; >> + s->usart_cr1 = 0x00000000; >> + s->usart_cr2 = 0x00000000; >> + s->usart_cr3 = 0x00000000; >> + s->usart_gtpr = 0x00000000; >> +} >> + >> +static uint64_t stm32f205_usart_read(void *opaque, hwaddr addr, >> + unsigned int size) >> +{ >> + STM32f205UsartState *s = opaque; >> + uint64_t retvalue; >> + >> + DB_PRINT("Read 0x%"HWADDR_PRIx"\n", addr); >> + >> + switch (addr) { >> + case USART_SR: >> + retvalue = s->usart_sr; >> + s->usart_sr &= ~USART_SR_TC; >> + if (s->chr) { >> + qemu_chr_accept_input(s->chr); >> + } >> + return retvalue; >> + case USART_DR: >> + DB_PRINT("Value: 0x%x, %c\n", s->usart_dr, (char) s->usart_dr); > > PRIx32 to match type of usart_dr. > >> + s->usart_sr |= USART_SR_TXE; >> + s->usart_sr &= ~USART_SR_RXNE; >> + return s->usart_dr & 0x3FF; >> + case USART_BRR: >> + return s->usart_brr; >> + case USART_CR1: >> + return s->usart_cr1; >> + case USART_CR2: >> + return s->usart_cr2; >> + case USART_CR3: >> + return s->usart_cr3; >> + case USART_GTPR: >> + return s->usart_gtpr; >> + default: >> + qemu_log_mask(LOG_GUEST_ERROR, >> + "STM32F205_usart_read: Bad offset " \ >> + "0x%"HWADDR_PRIx"\n", addr); >> + return 0; >> + } >> + >> + return 0; >> +} >> + >> +static void stm32f205_usart_write(void *opaque, hwaddr addr, >> + uint64_t val64, unsigned int size) >> +{ >> + STM32f205UsartState *s = opaque; >> + uint32_t value = val64; >> + unsigned char ch; >> + >> + DB_PRINT("Write 0x%x, 0x%"HWADDR_PRIx"\n", value, addr); >> + > > PRIx64 for value. > > Regards, > Peter
diff --git a/default-configs/arm-softmmu.mak b/default-configs/arm-softmmu.mak index cf23b24..422dec0 100644 --- a/default-configs/arm-softmmu.mak +++ b/default-configs/arm-softmmu.mak @@ -79,6 +79,7 @@ CONFIG_REALVIEW=y CONFIG_ZAURUS=y CONFIG_ZYNQ=y CONFIG_STM32F205_TIMER=y +CONFIG_STM32F205_USART=y CONFIG_VERSATILE_PCI=y CONFIG_VERSATILE_I2C=y diff --git a/hw/char/Makefile.objs b/hw/char/Makefile.objs index 317385d..c7b3ce4 100644 --- a/hw/char/Makefile.objs +++ b/hw/char/Makefile.objs @@ -15,6 +15,7 @@ obj-$(CONFIG_OMAP) += omap_uart.o obj-$(CONFIG_SH4) += sh_serial.o obj-$(CONFIG_PSERIES) += spapr_vty.o obj-$(CONFIG_DIGIC) += digic-uart.o +obj-$(CONFIG_STM32F205_USART) += stm32f205_usart.o common-obj-$(CONFIG_ETRAXFS) += etraxfs_ser.o common-obj-$(CONFIG_ISA_DEBUG) += debugcon.o diff --git a/hw/char/stm32f205_usart.c b/hw/char/stm32f205_usart.c new file mode 100644 index 0000000..1274e69 --- /dev/null +++ b/hw/char/stm32f205_usart.c @@ -0,0 +1,213 @@ +/* + * STM32F205 USART + * + * Copyright (c) 2014 Alistair Francis <alistair@alistair23.me> + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#include "hw/char/stm32f205_usart.h" + +#ifndef STM_USART_ERR_DEBUG +#define STM_USART_ERR_DEBUG 0 +#endif + +#define DB_PRINT_L(lvl, fmt, args...) do { \ + if (STM_USART_ERR_DEBUG >= lvl) { \ + qemu_log("stm32f205_usart: %s:" fmt, __func__, ## args); \ + } \ +} while (0); + +#define DB_PRINT(fmt, args...) DB_PRINT_L(1, fmt, ## args) + +static int stm32f205_usart_can_receive(void *opaque) +{ + STM32f205UsartState *s = opaque; + + if (s->usart_cr1 & USART_CR1_UE && s->usart_cr1 & USART_CR1_RE && + !(s->usart_sr & USART_SR_RXNE)) { + return 1; + } + + return 0; +} + +static void stm32f205_usart_receive(void *opaque, const uint8_t *buf, int size) +{ + STM32f205UsartState *s = opaque; + + s->usart_dr = *buf; + + s->usart_sr |= USART_SR_RXNE; + + if (s->usart_cr1 & USART_CR1_RXNEIE) { + qemu_set_irq(s->irq, 1); + } + + DB_PRINT("Receiving: %c\n", s->usart_dr); +} + +static void stm32f205_usart_reset(DeviceState *dev) +{ + STM32f205UsartState *s = STM32F205_USART(dev); + + s->usart_sr = 0x00C00000; + s->usart_dr = 0x00000000; + s->usart_brr = 0x00000000; + s->usart_cr1 = 0x00000000; + s->usart_cr2 = 0x00000000; + s->usart_cr3 = 0x00000000; + s->usart_gtpr = 0x00000000; +} + +static uint64_t stm32f205_usart_read(void *opaque, hwaddr addr, + unsigned int size) +{ + STM32f205UsartState *s = opaque; + uint64_t retvalue; + + DB_PRINT("Read 0x%"HWADDR_PRIx"\n", addr); + + switch (addr) { + case USART_SR: + retvalue = s->usart_sr; + s->usart_sr &= ~USART_SR_TC; + if (s->chr) { + qemu_chr_accept_input(s->chr); + } + return retvalue; + case USART_DR: + DB_PRINT("Value: 0x%x, %c\n", s->usart_dr, (char) s->usart_dr); + s->usart_sr |= USART_SR_TXE; + s->usart_sr &= ~USART_SR_RXNE; + return s->usart_dr & 0x3FF; + case USART_BRR: + return s->usart_brr; + case USART_CR1: + return s->usart_cr1; + case USART_CR2: + return s->usart_cr2; + case USART_CR3: + return s->usart_cr3; + case USART_GTPR: + return s->usart_gtpr; + default: + qemu_log_mask(LOG_GUEST_ERROR, + "STM32F205_usart_read: Bad offset " \ + "0x%"HWADDR_PRIx"\n", addr); + return 0; + } + + return 0; +} + +static void stm32f205_usart_write(void *opaque, hwaddr addr, + uint64_t val64, unsigned int size) +{ + STM32f205UsartState *s = opaque; + uint32_t value = val64; + unsigned char ch; + + DB_PRINT("Write 0x%x, 0x%"HWADDR_PRIx"\n", value, addr); + + switch (addr) { + case USART_SR: + if (value <= 0x3FF) { + s->usart_sr = value; + } else { + s->usart_sr &= value; + } + return; + case USART_DR: + if (value < 0xF000) { + ch = value; + if (s->chr) { + qemu_chr_fe_write_all(s->chr, &ch, 1); + } + s->usart_sr |= USART_SR_TC; + s->usart_sr &= ~USART_SR_TXE; + } + return; + case USART_BRR: + s->usart_brr = value; + return; + case USART_CR1: + s->usart_cr1 = value; + return; + case USART_CR2: + s->usart_cr2 = value; + return; + case USART_CR3: + s->usart_cr3 = value; + return; + case USART_GTPR: + s->usart_gtpr = value; + return; + default: + qemu_log_mask(LOG_GUEST_ERROR, + "STM32F205_usart_write: Bad offset " \ + "0x%"HWADDR_PRIx"\n", addr); + } +} + +static const MemoryRegionOps stm32f205_usart_ops = { + .read = stm32f205_usart_read, + .write = stm32f205_usart_write, + .endianness = DEVICE_NATIVE_ENDIAN, +}; + +static void stm32f205_usart_init(Object *obj) +{ + STM32f205UsartState *s = STM32F205_USART(obj); + + sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq); + + memory_region_init_io(&s->mmio, obj, &stm32f205_usart_ops, s, + TYPE_STM32F205_USART, 0x2000); + sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio); + + s->chr = qemu_char_get_next_serial(); + + if (s->chr) { + qemu_chr_add_handlers(s->chr, stm32f205_usart_can_receive, + stm32f205_usart_receive, NULL, s); + } +} + +static void stm32f205_usart_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + + dc->reset = stm32f205_usart_reset; +} + +static const TypeInfo stm32f205_usart_info = { + .name = TYPE_STM32F205_USART, + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(STM32f205UsartState), + .instance_init = stm32f205_usart_init, + .class_init = stm32f205_usart_class_init, +}; + +static void stm32f205_usart_register_types(void) +{ + type_register_static(&stm32f205_usart_info); +} + +type_init(stm32f205_usart_register_types) diff --git a/include/hw/char/stm32f205_usart.h b/include/hw/char/stm32f205_usart.h new file mode 100644 index 0000000..a08cd04 --- /dev/null +++ b/include/hw/char/stm32f205_usart.h @@ -0,0 +1,67 @@ +/* + * STM32F205 USART + * + * Copyright (c) 2014 Alistair Francis <alistair@alistair23.me> + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#include "hw/sysbus.h" +#include "sysemu/char.h" +#include "hw/hw.h" + +#define USART_SR 0x00 +#define USART_DR 0x04 +#define USART_BRR 0x08 +#define USART_CR1 0x0C +#define USART_CR2 0x10 +#define USART_CR3 0x14 +#define USART_GTPR 0x18 + +#define USART_SR_TXE (1 << 7) +#define USART_SR_TC (1 << 6) +#define USART_SR_RXNE (1 << 5) + +#define USART_CR1_UE (1 << 13) +#define USART_CR1_RXNEIE (1 << 5) +#define USART_CR1_TE (1 << 3) +#define USART_CR1_RE (1 << 2) + +#define TYPE_STM32F205_USART "stm32f205-usart" +#define STM32F205_USART(obj) \ + OBJECT_CHECK(STM32f205UsartState, (obj), TYPE_STM32F205_USART) + +typedef struct { + /* <private> */ + SysBusDevice parent_obj; + + /* <public> */ + MemoryRegion mmio; + + uint32_t usart_sr; + uint32_t usart_dr; + uint32_t usart_brr; + uint32_t usart_cr1; + uint32_t usart_cr2; + uint32_t usart_cr3; + uint32_t usart_gtpr; + + CharDriverState *chr; + qemu_irq irq; +} STM32f205UsartState;
This patch adds the stm32f205 USART controller (UART also uses the same controller). Signed-off-by: Alistair Francis <alistair23@gmail.com> --- Changes from RFC: - Small changes thanks to Peter C - USART now implements QEMU blocking functions - Split the config settings to device level default-configs/arm-softmmu.mak | 1 + hw/char/Makefile.objs | 1 + hw/char/stm32f205_usart.c | 213 ++++++++++++++++++++++++++++++++++++++ include/hw/char/stm32f205_usart.h | 67 ++++++++++++ 4 files changed, 282 insertions(+) create mode 100644 hw/char/stm32f205_usart.c create mode 100644 include/hw/char/stm32f205_usart.h