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[Qemu-devel] [PATCH v1 1/5] Netduino_USART: Add the Netduino Plus 2 USAR
From: |
Alistair Francis |
Subject: |
[Qemu-devel] [PATCH v1 1/5] Netduino_USART: Add the Netduino Plus 2 USART Controller |
Date: |
Sun, 24 Aug 2014 10:13:45 +1000 |
This patch adds the Netduino Plus 2 USART controller
(UART also uses the same controller).
It can be used for reading and writing to the guest.
Signed-off-by: Alistair Francis <address@hidden>
---
default-configs/arm-softmmu.mak | 1 +
hw/char/Makefile.objs | 1 +
hw/char/netduino_usart.c | 252 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 254 insertions(+)
create mode 100644 hw/char/netduino_usart.c
diff --git a/default-configs/arm-softmmu.mak b/default-configs/arm-softmmu.mak
index f3513fa..46471ad 100644
--- a/default-configs/arm-softmmu.mak
+++ b/default-configs/arm-softmmu.mak
@@ -78,6 +78,7 @@ CONFIG_NSERIES=y
CONFIG_REALVIEW=y
CONFIG_ZAURUS=y
CONFIG_ZYNQ=y
+CONFIG_NETDUINOP2=y
CONFIG_VERSATILE_PCI=y
CONFIG_VERSATILE_I2C=y
diff --git a/hw/char/Makefile.objs b/hw/char/Makefile.objs
index 317385d..c03aa98 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-$(CONFIG_NETDUINOP2) += netduino_usart.o
common-obj-$(CONFIG_ETRAXFS) += etraxfs_ser.o
common-obj-$(CONFIG_ISA_DEBUG) += debugcon.o
diff --git a/hw/char/netduino_usart.c b/hw/char/netduino_usart.c
new file mode 100644
index 0000000..437af2b
--- /dev/null
+++ b/hw/char/netduino_usart.c
@@ -0,0 +1,252 @@
+/*
+ * Netduino Plus 2 USART
+ *
+ * Copyright (c) 2014 Alistair Francis <address@hidden>
+ *
+ * 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 DEBUG_NETUSART */
+
+#ifdef DEBUG_NETUSART
+#define DPRINTF(fmt, ...) \
+do { printf("netduino_usart: " fmt , ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, ...) do {} while (0)
+#endif
+
+#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 TYPE_NETDUINO_USART "netduino_usart"
+#define NETDUINO_USART(obj) \
+ OBJECT_CHECK(struct net_usart, (obj), TYPE_NETDUINO_USART)
+
+struct net_usart {
+ SysBusDevice parent_obj;
+
+ 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;
+};
+
+static int usart_can_receive(void *opaque)
+{
+ struct net_usart *s = opaque;
+
+ if (s->usart_cr1 & USART_CR1_UE && s->usart_cr1 & USART_CR1_TE) {
+ return 1;
+ }
+
+ return 0;
+}
+
+static void usart_receive(void *opaque, const uint8_t *buf, int size)
+{
+ struct net_usart *s = opaque;
+ int i, num;
+
+ num = size > 8 ? 8 : size;
+ s->usart_dr = 0;
+
+ for (i = 0; i < num; i++) {
+ s->usart_dr |= (buf[i] << i);
+ }
+
+ s->usart_sr |= USART_SR_RXNE;
+
+ if (s->usart_cr1 & USART_CR1_RXNEIE) {
+ qemu_set_irq(s->irq, 1);
+ }
+
+ DPRINTF("Inputting: %c\n", s->usart_dr);
+}
+
+static void usart_reset(DeviceState *dev)
+{
+ struct net_usart *s = NETDUINO_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 netduino_usart_read(void *opaque, hwaddr addr,
+ unsigned int size)
+{
+ struct net_usart *s = opaque;
+ uint64_t retvalue;
+
+ DPRINTF("Read 0x%x\n", (uint) addr);
+
+ switch (addr) {
+ case USART_SR:
+ retvalue = s->usart_sr;
+ s->usart_sr &= (USART_SR_TC ^ 0xFFFF);
+ return retvalue;
+ case USART_DR:
+ DPRINTF("Value: %x, %c\n", s->usart_dr, s->usart_dr);
+ s->usart_sr |= USART_SR_TXE;
+ 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,
+ "net_usart_read: Bad offset %x\n", (int)addr);
+ return 0;
+ }
+
+ return 0;
+}
+
+static void netduino_usart_write(void *opaque, hwaddr addr,
+ uint64_t val64, unsigned int size)
+{
+ struct net_usart *s = opaque;
+ uint32_t value = (uint32_t) val64;
+ unsigned char ch;
+
+ DPRINTF("Write 0x%x, 0x%x\n", value, (uint) 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(s->chr, &ch, 1);
+ }
+ s->usart_sr |= USART_SR_TC;
+ }
+ 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,
+ "net_usart_write: Bad offset %x\n", (int)addr);
+ }
+}
+
+static const MemoryRegionOps netduino_usart_ops = {
+ .read = netduino_usart_read,
+ .write = netduino_usart_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static int netduino_usart_init(SysBusDevice *sbd)
+{
+ DeviceState *dev = DEVICE(sbd);
+ struct net_usart *s = NETDUINO_USART(dev);
+
+ sysbus_init_irq(sbd, &s->irq);
+
+ memory_region_init_io(&s->mmio, OBJECT(s), &netduino_usart_ops, s,
+ TYPE_NETDUINO_USART, 0x2000);
+ sysbus_init_mmio(sbd, &s->mmio);
+
+ s->chr = qemu_char_get_next_serial();
+
+ if (s->chr) {
+ qemu_chr_add_handlers(s->chr, usart_can_receive, usart_receive,
+ NULL, s);
+ }
+
+ return 0;
+}
+
+static void netduino_usart_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
+
+ k->init = netduino_usart_init;
+ dc->props = NULL;
+ dc->reset = usart_reset;
+}
+
+static const TypeInfo netduino_usart_info = {
+ .name = TYPE_NETDUINO_USART,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(struct net_usart),
+ .class_init = netduino_usart_class_init,
+};
+
+static void netduino_usart_register_types(void)
+{
+ type_register_static(&netduino_usart_info);
+}
+
+type_init(netduino_usart_register_types)
--
1.9.1