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-rw-r--r--hw/milkymist-hw.h5
-rw-r--r--hw/milkymist-uart.c72
-rw-r--r--hw/milkymist.c14
-rw-r--r--target-lm32/helper.c1
-rw-r--r--trace-events4
5 files changed, 75 insertions, 21 deletions
diff --git a/hw/milkymist-hw.h b/hw/milkymist-hw.h
index 20de68ecc..9f358a7d6 100644
--- a/hw/milkymist-hw.h
+++ b/hw/milkymist-hw.h
@@ -5,15 +5,14 @@
#include "qdev-addr.h"
static inline DeviceState *milkymist_uart_create(target_phys_addr_t base,
- qemu_irq rx_irq, qemu_irq tx_irq)
+ qemu_irq irq)
{
DeviceState *dev;
dev = qdev_create(NULL, "milkymist-uart");
qdev_init_nofail(dev);
sysbus_mmio_map(sysbus_from_qdev(dev), 0, base);
- sysbus_connect_irq(sysbus_from_qdev(dev), 0, rx_irq);
- sysbus_connect_irq(sysbus_from_qdev(dev), 1, tx_irq);
+ sysbus_connect_irq(sysbus_from_qdev(dev), 0, irq);
return dev;
}
diff --git a/hw/milkymist-uart.c b/hw/milkymist-uart.c
index e8e309de7..d836462e4 100644
--- a/hw/milkymist-uart.c
+++ b/hw/milkymist-uart.c
@@ -30,19 +30,53 @@
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),
+};
+
struct MilkymistUartState {
SysBusDevice busdev;
CharDriverState *chr;
- qemu_irq rx_irq;
- qemu_irq tx_irq;
+ qemu_irq irq;
uint32_t regs[R_MAX];
};
typedef struct MilkymistUartState MilkymistUartState;
+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 uint32_t uart_read(void *opaque, target_phys_addr_t addr)
{
MilkymistUartState *s = opaque;
@@ -51,7 +85,12 @@ static uint32_t uart_read(void *opaque, target_phys_addr_t addr)
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;
@@ -79,18 +118,26 @@ static void uart_write(void *opaque, target_phys_addr_t addr, uint32_t value)
if (s->chr) {
qemu_chr_fe_write(s->chr, &ch, 1);
}
- trace_milkymist_uart_pulse_irq_tx();
- qemu_irq_pulse(s->tx_irq);
+ 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));
+ break;
+
default:
error_report("milkymist_uart: write access to unknown register 0x"
TARGET_FMT_plx, addr << 2);
break;
}
+
+ uart_update_irq(s);
}
static CPUReadMemoryFunc * const uart_read_fn[] = {
@@ -109,14 +156,19 @@ 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;
- trace_milkymist_uart_pulse_irq_rx();
- qemu_irq_pulse(s->rx_irq);
+
+ uart_update_irq(s);
}
static int uart_can_rx(void *opaque)
{
- return 1;
+ MilkymistUartState *s = opaque;
+
+ return !(s->regs[R_STAT] & STAT_RX_EVT);
}
static void uart_event(void *opaque, int event)
@@ -131,6 +183,9 @@ static void milkymist_uart_reset(DeviceState *d)
for (i = 0; i < R_MAX; i++) {
s->regs[i] = 0;
}
+
+ /* THRE is always set */
+ s->regs[R_STAT] = STAT_THRE;
}
static int milkymist_uart_init(SysBusDevice *dev)
@@ -138,8 +193,7 @@ static int milkymist_uart_init(SysBusDevice *dev)
MilkymistUartState *s = FROM_SYSBUS(typeof(*s), dev);
int uart_regs;
- sysbus_init_irq(dev, &s->rx_irq);
- sysbus_init_irq(dev, &s->tx_irq);
+ sysbus_init_irq(dev, &s->irq);
uart_regs = cpu_register_io_memory(uart_read_fn, uart_write_fn, s,
DEVICE_NATIVE_ENDIAN);
diff --git a/hw/milkymist.c b/hw/milkymist.c
index bca0a58d8..b7a8c1c25 100644
--- a/hw/milkymist.c
+++ b/hw/milkymist.c
@@ -146,17 +146,17 @@ milkymist_init(ram_addr_t ram_size_not_used,
exit(1);
}
- milkymist_uart_create(0x60000000, irq[0], irq[1]);
- milkymist_sysctl_create(0x60001000, irq[2], irq[3], irq[4],
+ milkymist_uart_create(0x60000000, irq[0]);
+ milkymist_sysctl_create(0x60001000, irq[1], irq[2], irq[3],
80000000, 0x10014d31, 0x0000041f, 0x00000001);
milkymist_hpdmc_create(0x60002000);
milkymist_vgafb_create(0x60003000, 0x40000000, 0x0fffffff);
milkymist_memcard_create(0x60004000);
- milkymist_ac97_create(0x60005000, irq[5], irq[6], irq[7], irq[8]);
- milkymist_pfpu_create(0x60006000, irq[9]);
- milkymist_tmu2_create(0x60007000, irq[10]);
- milkymist_minimac2_create(0x60008000, 0x30000000, irq[11], irq[12]);
- milkymist_softusb_create(0x6000f000, irq[17],
+ milkymist_ac97_create(0x60005000, irq[4], irq[5], irq[6], irq[7]);
+ milkymist_pfpu_create(0x60006000, irq[8]);
+ milkymist_tmu2_create(0x60007000, irq[9]);
+ milkymist_minimac2_create(0x60008000, 0x30000000, irq[10], irq[11]);
+ milkymist_softusb_create(0x6000f000, irq[15],
0x20000000, 0x1000, 0x20020000, 0x2000);
/* make sure juart isn't the first chardev */
diff --git a/target-lm32/helper.c b/target-lm32/helper.c
index 014fd8de0..fc0b444d8 100644
--- a/target-lm32/helper.c
+++ b/target-lm32/helper.c
@@ -218,6 +218,7 @@ CPUState *cpu_lm32_init(const char *cpu_model)
cpu_exec_init(env);
cpu_reset(env);
+ qemu_init_vcpu(env);
if (!tcg_initialized) {
tcg_initialized = 1;
diff --git a/trace-events b/trace-events
index 9528c04fe..63d8c8ed7 100644
--- a/trace-events
+++ b/trace-events
@@ -445,8 +445,8 @@ milkymist_tmu2_pulse_irq(void) "Pulse IRQ"
# hw/milkymist-uart.c
milkymist_uart_memory_read(uint32_t addr, uint32_t value) "addr %08x value %08x"
milkymist_uart_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"
-milkymist_uart_pulse_irq_rx(void) "Pulse IRQ RX"
-milkymist_uart_pulse_irq_tx(void) "Pulse IRQ TX"
+milkymist_uart_raise_irq(void) "Raise IRQ"
+milkymist_uart_lower_irq(void) "Lower IRQ"
# hw/milkymist-vgafb.c
milkymist_vgafb_memory_read(uint32_t addr, uint32_t value) "addr %08x value %08x"
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-30 11:26:42 +0000