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path: root/hw/etraxfs_ser.c
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Diffstat (limited to 'hw/etraxfs_ser.c')
-rw-r--r--hw/etraxfs_ser.c127
1 files changed, 44 insertions, 83 deletions
diff --git a/hw/etraxfs_ser.c b/hw/etraxfs_ser.c
index d16a14eb37..80091d5719 100644
--- a/hw/etraxfs_ser.c
+++ b/hw/etraxfs_ser.c
@@ -30,16 +30,17 @@
#define D(x)
-#define RW_TR_CTRL 0x00
-#define RW_TR_DMA_EN 0x04
-#define RW_REC_CTRL 0x08
-#define RW_DOUT 0x1c
-#define RS_STAT_DIN 0x20
-#define R_STAT_DIN 0x24
-#define RW_INTR_MASK 0x2c
-#define RW_ACK_INTR 0x30
-#define R_INTR 0x34
-#define R_MASKED_INTR 0x38
+#define RW_TR_CTRL (0x00 / 4)
+#define RW_TR_DMA_EN (0x04 / 4)
+#define RW_REC_CTRL (0x08 / 4)
+#define RW_DOUT (0x1c / 4)
+#define RS_STAT_DIN (0x20 / 4)
+#define R_STAT_DIN (0x24 / 4)
+#define RW_INTR_MASK (0x2c / 4)
+#define RW_ACK_INTR (0x30 / 4)
+#define R_INTR (0x34 / 4)
+#define R_MASKED_INTR (0x38 / 4)
+#define R_MAX (0x3c / 4)
#define STAT_DAV 16
#define STAT_TR_IDLE 22
@@ -51,30 +52,20 @@ struct etrax_serial
CharDriverState *chr;
qemu_irq *irq;
+ /* This pending thing is a hack. */
int pending_tx;
/* Control registers. */
- uint32_t rw_tr_ctrl;
- uint32_t rw_tr_dma_en;
- uint32_t rw_rec_ctrl;
- uint32_t rs_stat_din;
- uint32_t r_stat_din;
- uint32_t rw_intr_mask;
- uint32_t rw_ack_intr;
- uint32_t r_intr;
- uint32_t r_masked_intr;
+ uint32_t regs[R_MAX];
};
static void ser_update_irq(struct etrax_serial *s)
{
- s->r_intr &= ~(s->rw_ack_intr);
- s->r_masked_intr = s->r_intr & s->rw_intr_mask;
-
- D(printf("irq_mask=%x r_intr=%x rmi=%x airq=%x \n",
- s->rw_intr_mask, s->r_intr,
- s->r_masked_intr, s->rw_ack_intr));
- qemu_set_irq(s->irq[0], !!s->r_masked_intr);
- s->rw_ack_intr = 0;
+ s->regs[R_INTR] &= ~(s->regs[RW_ACK_INTR]);
+ s->regs[R_MASKED_INTR] = s->regs[R_INTR] & s->regs[RW_INTR_MASK];
+
+ qemu_set_irq(s->irq[0], !!s->regs[R_MASKED_INTR]);
+ s->regs[RW_ACK_INTR] = 0;
}
static uint32_t ser_readl (void *opaque, target_phys_addr_t addr)
@@ -83,40 +74,20 @@ static uint32_t ser_readl (void *opaque, target_phys_addr_t addr)
D(CPUState *env = s->env);
uint32_t r = 0;
+ addr >>= 2;
switch (addr)
{
- case RW_TR_CTRL:
- r = s->rw_tr_ctrl;
- break;
- case RW_TR_DMA_EN:
- r = s->rw_tr_dma_en;
- break;
- case RS_STAT_DIN:
- r = s->rs_stat_din;
- /* clear dav. */
- s->rs_stat_din &= ~(1 << STAT_DAV);
- break;
case R_STAT_DIN:
- r = s->rs_stat_din;
- break;
- case RW_ACK_INTR:
- D(printf("load rw_ack_intr=%x\n", s->rw_ack_intr));
- r = s->rw_ack_intr;
+ r = s->regs[RS_STAT_DIN];
break;
- case RW_INTR_MASK:
- r = s->rw_intr_mask;
- break;
- case R_INTR:
- D(printf("load r_intr=%x\n", s->r_intr));
- r = s->r_intr;
- break;
- case R_MASKED_INTR:
- D(printf("load r_maked_intr=%x\n", s->r_masked_intr));
- r = s->r_masked_intr;
+ case RS_STAT_DIN:
+ r = s->regs[addr];
+ /* Read side-effect: clear dav. */
+ s->regs[addr] &= ~(1 << STAT_DAV);
break;
-
default:
- D(printf ("%s %x\n", __func__, addr));
+ r = s->regs[addr];
+ D(printf ("%s %x=%x\n", __func__, addr, r));
break;
}
return r;
@@ -129,36 +100,26 @@ ser_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
unsigned char ch = value;
D(CPUState *env = s->env);
+ D(printf ("%s %x %x\n", __func__, addr, value));
+ addr >>= 2;
switch (addr)
{
- case RW_TR_CTRL:
- D(printf("rw_tr_ctrl=%x\n", value));
- s->rw_tr_ctrl = value;
- break;
- case RW_TR_DMA_EN:
- D(printf("rw_tr_dma_en=%x\n", value));
- s->rw_tr_dma_en = value;
- break;
case RW_DOUT:
qemu_chr_write(s->chr, &ch, 1);
- s->r_intr |= 1;
+ s->regs[R_INTR] |= 1;
s->pending_tx = 1;
+ s->regs[addr] = value;
break;
case RW_ACK_INTR:
- D(printf("rw_ack_intr=%x\n", value));
- s->rw_ack_intr = value;
- if (s->pending_tx && (s->rw_ack_intr & 1)) {
- s->r_intr |= 1;
+ s->regs[addr] = value;
+ if (s->pending_tx && (s->regs[addr] & 1)) {
+ s->regs[R_INTR] |= 1;
s->pending_tx = 0;
- s->rw_ack_intr &= ~1;
+ s->regs[addr] &= ~1;
}
break;
- case RW_INTR_MASK:
- D(printf("r_intr_mask=%x\n", value));
- s->rw_intr_mask = value;
- break;
default:
- D(printf ("%s %x %x\n", __func__, addr, value));
+ s->regs[addr] = value;
break;
}
ser_update_irq(s);
@@ -178,10 +139,10 @@ static void serial_receive(void *opaque, const uint8_t *buf, int size)
{
struct etrax_serial *s = opaque;
- s->r_intr |= 8;
- s->rs_stat_din &= ~0xff;
- s->rs_stat_din |= (buf[0] & 0xff);
- s->rs_stat_din |= (1 << STAT_DAV); /* dav. */
+ s->regs[R_INTR] |= 8;
+ s->regs[RS_STAT_DIN] &= ~0xff;
+ s->regs[RS_STAT_DIN] |= (buf[0] & 0xff);
+ s->regs[RS_STAT_DIN] |= (1 << STAT_DAV); /* dav. */
ser_update_irq(s);
}
@@ -191,10 +152,10 @@ static int serial_can_receive(void *opaque)
int r;
/* Is the receiver enabled? */
- r = s->rw_rec_ctrl & 1;
+ r = s->regs[RW_REC_CTRL] & 1;
/* Pending rx data? */
- r |= !(s->r_intr & 8);
+ r |= !(s->regs[R_INTR] & 8);
return r;
}
@@ -216,12 +177,12 @@ void etraxfs_ser_init(CPUState *env, qemu_irq *irq, CharDriverState *chr,
s->chr = chr;
/* transmitter begins ready and idle. */
- s->rs_stat_din |= (1 << STAT_TR_RDY);
- s->rs_stat_din |= (1 << STAT_TR_IDLE);
+ s->regs[RS_STAT_DIN] |= (1 << STAT_TR_RDY);
+ s->regs[RS_STAT_DIN] |= (1 << STAT_TR_IDLE);
qemu_chr_add_handlers(chr, serial_can_receive, serial_receive,
serial_event, s);
ser_regs = cpu_register_io_memory(0, ser_read, ser_write, s);
- cpu_register_physical_memory (base, 0x3c, ser_regs);
+ cpu_register_physical_memory (base, R_MAX * 4, ser_regs);
}
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-22 18:05:28 +0000