diff options
Diffstat (limited to 'hw/char/milkymist-uart.c')
| -rw-r--r-- | hw/char/milkymist-uart.c | 258 |
1 files changed, 0 insertions, 258 deletions
diff --git a/hw/char/milkymist-uart.c b/hw/char/milkymist-uart.c deleted file mode 100644 index cb1b3470ad..0000000000 --- a/hw/char/milkymist-uart.c +++ /dev/null @@ -1,258 +0,0 @@ -/* - * QEMU model of the Milkymist UART block. - * - * Copyright (c) 2010 Michael Walle <michael@walle.cc> - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, see <http://www.gnu.org/licenses/>. - * - * - * Specification available at: - * http://milkymist.walle.cc/socdoc/uart.pdf - */ - -#include "qemu/osdep.h" -#include "hw/irq.h" -#include "hw/qdev-properties.h" -#include "hw/qdev-properties-system.h" -#include "hw/sysbus.h" -#include "migration/vmstate.h" -#include "trace.h" -#include "chardev/char-fe.h" -#include "qemu/error-report.h" -#include "qemu/module.h" -#include "qom/object.h" - -enum { - R_RXTX = 0, - R_DIV, - R_STAT, - R_CTRL, - R_DBG, - R_MAX -}; - -enum { - STAT_THRE = (1<<0), - STAT_RX_EVT = (1<<1), - STAT_TX_EVT = (1<<2), -}; - -enum { - CTRL_RX_IRQ_EN = (1<<0), - CTRL_TX_IRQ_EN = (1<<1), - CTRL_THRU_EN = (1<<2), -}; - -enum { - DBG_BREAK_EN = (1<<0), -}; - -#define TYPE_MILKYMIST_UART "milkymist-uart" -OBJECT_DECLARE_SIMPLE_TYPE(MilkymistUartState, MILKYMIST_UART) - -struct MilkymistUartState { - SysBusDevice parent_obj; - - MemoryRegion regs_region; - CharBackend chr; - qemu_irq irq; - - uint32_t regs[R_MAX]; -}; - -static void uart_update_irq(MilkymistUartState *s) -{ - int rx_event = s->regs[R_STAT] & STAT_RX_EVT; - int tx_event = s->regs[R_STAT] & STAT_TX_EVT; - int rx_irq_en = s->regs[R_CTRL] & CTRL_RX_IRQ_EN; - int tx_irq_en = s->regs[R_CTRL] & CTRL_TX_IRQ_EN; - - if ((rx_irq_en && rx_event) || (tx_irq_en && tx_event)) { - trace_milkymist_uart_raise_irq(); - qemu_irq_raise(s->irq); - } else { - trace_milkymist_uart_lower_irq(); - qemu_irq_lower(s->irq); - } -} - -static uint64_t uart_read(void *opaque, hwaddr addr, - unsigned size) -{ - MilkymistUartState *s = opaque; - uint32_t r = 0; - - addr >>= 2; - switch (addr) { - case R_RXTX: - r = s->regs[addr]; - break; - case R_DIV: - case R_STAT: - case R_CTRL: - case R_DBG: - r = s->regs[addr]; - break; - - default: - error_report("milkymist_uart: read access to unknown register 0x" - TARGET_FMT_plx, addr << 2); - break; - } - - trace_milkymist_uart_memory_read(addr << 2, r); - - return r; -} - -static void uart_write(void *opaque, hwaddr addr, uint64_t value, - unsigned size) -{ - MilkymistUartState *s = opaque; - unsigned char ch = value; - - trace_milkymist_uart_memory_write(addr, value); - - addr >>= 2; - switch (addr) { - case R_RXTX: - qemu_chr_fe_write_all(&s->chr, &ch, 1); - s->regs[R_STAT] |= STAT_TX_EVT; - break; - case R_DIV: - case R_CTRL: - case R_DBG: - s->regs[addr] = value; - break; - - case R_STAT: - /* write one to clear bits */ - s->regs[addr] &= ~(value & (STAT_RX_EVT | STAT_TX_EVT)); - qemu_chr_fe_accept_input(&s->chr); - break; - - default: - error_report("milkymist_uart: write access to unknown register 0x" - TARGET_FMT_plx, addr << 2); - break; - } - - uart_update_irq(s); -} - -static const MemoryRegionOps uart_mmio_ops = { - .read = uart_read, - .write = uart_write, - .valid = { - .min_access_size = 4, - .max_access_size = 4, - }, - .endianness = DEVICE_NATIVE_ENDIAN, -}; - -static void uart_rx(void *opaque, const uint8_t *buf, int size) -{ - MilkymistUartState *s = opaque; - - assert(!(s->regs[R_STAT] & STAT_RX_EVT)); - - s->regs[R_STAT] |= STAT_RX_EVT; - s->regs[R_RXTX] = *buf; - - uart_update_irq(s); -} - -static int uart_can_rx(void *opaque) -{ - MilkymistUartState *s = opaque; - - return !(s->regs[R_STAT] & STAT_RX_EVT); -} - -static void uart_event(void *opaque, QEMUChrEvent event) -{ -} - -static void milkymist_uart_reset(DeviceState *d) -{ - MilkymistUartState *s = MILKYMIST_UART(d); - int i; - - for (i = 0; i < R_MAX; i++) { - s->regs[i] = 0; - } - - /* THRE is always set */ - s->regs[R_STAT] = STAT_THRE; -} - -static void milkymist_uart_realize(DeviceState *dev, Error **errp) -{ - MilkymistUartState *s = MILKYMIST_UART(dev); - - qemu_chr_fe_set_handlers(&s->chr, uart_can_rx, uart_rx, - uart_event, NULL, s, NULL, true); -} - -static void milkymist_uart_init(Object *obj) -{ - SysBusDevice *sbd = SYS_BUS_DEVICE(obj); - MilkymistUartState *s = MILKYMIST_UART(obj); - - sysbus_init_irq(sbd, &s->irq); - - memory_region_init_io(&s->regs_region, OBJECT(s), &uart_mmio_ops, s, - "milkymist-uart", R_MAX * 4); - sysbus_init_mmio(sbd, &s->regs_region); -} - -static const VMStateDescription vmstate_milkymist_uart = { - .name = "milkymist-uart", - .version_id = 1, - .minimum_version_id = 1, - .fields = (VMStateField[]) { - VMSTATE_UINT32_ARRAY(regs, MilkymistUartState, R_MAX), - VMSTATE_END_OF_LIST() - } -}; - -static Property milkymist_uart_properties[] = { - DEFINE_PROP_CHR("chardev", MilkymistUartState, chr), - DEFINE_PROP_END_OF_LIST(), -}; - -static void milkymist_uart_class_init(ObjectClass *klass, void *data) -{ - DeviceClass *dc = DEVICE_CLASS(klass); - - dc->realize = milkymist_uart_realize; - dc->reset = milkymist_uart_reset; - dc->vmsd = &vmstate_milkymist_uart; - device_class_set_props(dc, milkymist_uart_properties); -} - -static const TypeInfo milkymist_uart_info = { - .name = TYPE_MILKYMIST_UART, - .parent = TYPE_SYS_BUS_DEVICE, - .instance_size = sizeof(MilkymistUartState), - .instance_init = milkymist_uart_init, - .class_init = milkymist_uart_class_init, -}; - -static void milkymist_uart_register_types(void) -{ - type_register_static(&milkymist_uart_info); -} - -type_init(milkymist_uart_register_types) |