From f062058fa174611d4c1bbc28e40b14be4bce89f8 Mon Sep 17 00:00:00 2001 From: edgar_igl Date: Fri, 2 May 2008 22:21:55 +0000 Subject: ETRAX serial port: * Simulate basic interrupt driven serial io. * Connect to qemu char dev. git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4300 c046a42c-6fe2-441c-8c8c-71466251a162 --- hw/etraxfs_ser.c | 193 ++++++++++++++++++++++++++++++++++++++++++++++--------- 1 file changed, 164 insertions(+), 29 deletions(-) (limited to 'hw/etraxfs_ser.c') diff --git a/hw/etraxfs_ser.c b/hw/etraxfs_ser.c index 778b429c0..bb971f8d2 100644 --- a/hw/etraxfs_ser.c +++ b/hw/etraxfs_ser.c @@ -25,21 +25,68 @@ #include #include #include "hw.h" +#include "qemu-char.h" #define D(x) -#define RW_TR_DMA_EN 0x04 -#define RW_DOUT 0x1c -#define RW_STAT_DIN 0x20 -#define R_STAT_DIN 0x24 +#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 -static uint32_t ser_readb (void *opaque, target_phys_addr_t addr) +#define STAT_DAV 16 +#define STAT_TR_IDLE 22 +#define STAT_TR_RDY 24 + +struct etrax_serial_t { - D(CPUState *env = opaque); - D(printf ("%s %x pc=%x\n", __func__, addr, env->pc)); - return 0; + CPUState *env; + CharDriverState *chr; + qemu_irq *irq; + + target_phys_addr_t base; + + 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; +}; + +static void ser_update_irq(struct etrax_serial_t *s) +{ + uint32_t o_irq = s->r_masked_intr; + + s->r_intr &= ~(s->rw_ack_intr); + s->r_masked_intr = s->r_intr & s->rw_intr_mask; + + if (o_irq != s->r_masked_intr) { + 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)); + if (s->r_masked_intr) + qemu_irq_raise(s->irq[0]); + else + qemu_irq_lower(s->irq[0]); + } + s->rw_ack_intr = 0; } -static uint32_t ser_readw (void *opaque, target_phys_addr_t addr) + + +static uint32_t ser_readb (void *opaque, target_phys_addr_t addr) { D(CPUState *env = opaque); D(printf ("%s %x pc=%x\n", __func__, addr, env->pc)); @@ -48,16 +95,40 @@ static uint32_t ser_readw (void *opaque, target_phys_addr_t addr) static uint32_t ser_readl (void *opaque, target_phys_addr_t addr) { - D(CPUState *env = opaque); + struct etrax_serial_t *s = opaque; + D(CPUState *env = s->env); uint32_t r = 0; switch (addr & 0xfff) { + 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 |= 1 << 24; /* set tr_rdy. */ - r |= 1 << 22; /* set tr_idle. */ + 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; + 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; break; default: @@ -70,53 +141,117 @@ static uint32_t ser_readl (void *opaque, target_phys_addr_t addr) static void ser_writeb (void *opaque, target_phys_addr_t addr, uint32_t value) { - D(CPUState *env = opaque); + D(struct etrax_serial_t *s = opaque); + D(CPUState *env = s->env); D(printf ("%s %x %x pc=%x\n", __func__, addr, value, env->pc)); } static void -ser_writew (void *opaque, target_phys_addr_t addr, uint32_t value) -{ - D(CPUState *env = opaque); - D(printf ("%s %x %x pc=%x\n", __func__, addr, value, env->pc)); -} -static void ser_writel (void *opaque, target_phys_addr_t addr, uint32_t value) { - D(CPUState *env = opaque); + struct etrax_serial_t *s = opaque; + unsigned char ch = value; + D(CPUState *env = s->env); switch (addr & 0xfff) { + 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: - if (isprint(value) || isspace(value)) - putchar(value); - else - putchar('.'); - fflush(stdout); + qemu_chr_write(s->chr, &ch, 1); + s->r_intr |= 1; + s->pending_tx = 1; + 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->pending_tx = 0; + s->rw_ack_intr &= ~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 pc=%x\n", __func__, addr, value, env->pc)); break; } + ser_update_irq(s); } static CPUReadMemoryFunc *ser_read[] = { &ser_readb, - &ser_readw, + &ser_readb, &ser_readl, }; static CPUWriteMemoryFunc *ser_write[] = { &ser_writeb, - &ser_writew, + &ser_writeb, &ser_writel, }; -void etraxfs_ser_init(CPUState *env, qemu_irq *irqs, target_phys_addr_t base) +static void serial_receive(void *opaque, const uint8_t *buf, int size) { + struct etrax_serial_t *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. */ + ser_update_irq(s); +} + +static int serial_can_receive(void *opaque) +{ + struct etrax_serial_t *s = opaque; + int r; + + /* Is the receiver enabled? */ + r = s->rw_rec_ctrl & 1; + + /* Pending rx data? */ + r |= !(s->r_intr & 8); + return r; +} + +static void serial_event(void *opaque, int event) +{ + +} + +void etraxfs_ser_init(CPUState *env, qemu_irq *irq, CharDriverState *chr, + target_phys_addr_t base) +{ + struct etrax_serial_t *s; int ser_regs; - ser_regs = cpu_register_io_memory(0, ser_read, ser_write, env); + + s = qemu_mallocz(sizeof *s); + if (!s) + return; + + s->env = env; + s->irq = irq; + s->base = base; + + s->chr = chr; + + /* transmitter begins ready and idle. */ + s->rs_stat_din |= (1 << STAT_TR_RDY); + s->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); 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