Stand-alone TMU emulation code, by Magnus Damm.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3269 c046a42c-6fe2-441c-8c8c-71466251a162

6 files changed, 336 insertions, 196 deletions

diff --git a/Makefile.target b/Makefile.target
index 280f3711b8..fd44a8120b 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -476,6 +476,7 @@ CPPFLAGS += -DHAS_AUDIO
 endif
 ifeq ($(TARGET_BASE_ARCH), sh4)
 VL_OBJS+= shix.o r2d.o sh7750.o sh7750_regnames.o tc58128.o
+VL_OBJS+= sh_timer.o ptimer.o
 endif
 ifeq ($(TARGET_BASE_ARCH), m68k)
 VL_OBJS+= an5206.o mcf5206.o ptimer.o mcf_uart.o mcf_intc.o mcf5208.o mcf_fec.o
diff --git a/hw/sh7750.c b/hw/sh7750.c
index dcba14e1af..9002da31af 100644
--- a/hw/sh7750.c
+++ b/hw/sh7750.c
@@ -64,13 +64,6 @@ typedef struct SH7750State {
     uint8_t scbrr2;
     fifo serial2_receive_fifo;
     fifo serial2_transmit_fifo;
-    /* Timers */
-    uint8_t tstr;
-    /* Timer 0 */
-    QEMUTimer *timer0;
-    uint16_t tcr0;
-    uint32_t tcor0;
-    uint32_t tcnt0;
     /* IO ports */
     uint16_t gpioic;
     uint32_t pctra;
@@ -88,83 +81,8 @@ typedef struct SH7750State {
     sh7750_io_device *devices[NB_DEVICES];	/* External peripherals */
     /* Cache */
     uint32_t ccr;
-} SH7750State;
-
-/**********************************************************************
- Timers
-**********************************************************************/
-
-/* XXXXX At this time, timer0 works in underflow only mode, that is
-   the value of tcnt0 is read at alarm computation time and cannot
-   be read back by the guest OS */
-
-static void start_timer0(SH7750State * s)
-{
-    uint64_t now, next, prescaler;
-
-    if ((s->tcr0 & 6) == 6) {
-	fprintf(stderr, "rtc clock for timer 0 not supported\n");
-	assert(0);
-    }
 
-    if ((s->tcr0 & 7) == 5) {
-	fprintf(stderr, "timer 0 configuration not supported\n");
-	assert(0);
-    }
-
-    if ((s->tcr0 & 4) == 4)
-	prescaler = 1024;
-    else
-	prescaler = 4 << (s->tcr0 & 3);
-
-    now = qemu_get_clock(vm_clock);
-    /* XXXXX */
-    next =
-	now + muldiv64(prescaler * s->tcnt0, ticks_per_sec,
-		       s->periph_freq);
-    if (next == now)
-	next = now + 1;
-    fprintf(stderr, "now=%016" PRIx64 ", next=%016" PRIx64 "\n", now, next);
-    fprintf(stderr, "timer will underflow in %f seconds\n",
-	    (float) (next - now) / (float) ticks_per_sec);
-
-    qemu_mod_timer(s->timer0, next);
-}
-
-static void timer_start_changed(SH7750State * s)
-{
-    if (s->tstr & SH7750_TSTR_STR0) {
-	start_timer0(s);
-    } else {
-	fprintf(stderr, "timer 0 is stopped\n");
-	qemu_del_timer(s->timer0);
-    }
-}
-
-static void timer0_cb(void *opaque)
-{
-    SH7750State *s = opaque;
-
-    s->tcnt0 = (uint32_t) 0;	/* XXXXX */
-    if (--s->tcnt0 == (uint32_t) - 1) {
-	fprintf(stderr, "timer 0 underflow\n");
-	s->tcnt0 = s->tcor0;
-	s->tcr0 |= SH7750_TCR_UNF;
-	if (s->tcr0 & SH7750_TCR_UNIE) {
-	    fprintf(stderr,
-		    "interrupt generation for timer 0 not supported\n");
-	    assert(0);
-	}
-    }
-    start_timer0(s);
-}
-
-static void init_timers(SH7750State * s)
-{
-    s->tcor0 = 0xffffffff;
-    s->tcnt0 = 0xffffffff;
-    s->timer0 = qemu_new_timer(vm_clock, &timer0_cb, s);
-}
+} SH7750State;
 
 /**********************************************************************
  First serial port
@@ -581,8 +499,6 @@ static uint32_t sh7750_mem_readw(void *opaque, target_phys_addr_t addr)
 	fprintf(stderr,
 		"Read access to refresh count register, incrementing\n");
 	return s->rfcr++;
-    case SH7750_TCR0_A7:
-	return s->tcr0;
     case SH7750_SCLSR2_A7:
 	/* Read and clear overflow bit */
 	r = s->sclsr2;
@@ -649,10 +565,6 @@ static void sh7750_mem_writeb(void *opaque, target_phys_addr_t addr,
     case SH7750_SCBRR2_A7:
 	s->scbrr2 = mem_value;
 	return;
-    case SH7750_TSTR_A7:
-	s->tstr = mem_value;
-	timer_start_changed(s);
-	return;
     case SH7750_SCSCR1_A7:
 	s->scscr1 = mem_value;
 	scscr1_changed(s);
@@ -721,9 +633,6 @@ static void sh7750_mem_writew(void *opaque, target_phys_addr_t addr,
     case SH7750_SCSMR2_A7:
 	s->scsmr2 = mem_value;
 	return;
-    case SH7750_TCR0_A7:
-	s->tcr0 = mem_value;
-	return;
     case SH7750_GPIOIC_A7:
 	s->gpioic = mem_value;
 	if (mem_value != 0) {
@@ -768,9 +677,6 @@ static void sh7750_mem_writel(void *opaque, target_phys_addr_t addr,
 	s->portpullupb = portpullup(mem_value);
 	portb_changed(s, temp);
 	return;
-    case SH7750_TCNT0_A7:
-	s->tcnt0 = mem_value & 0xf;
-	return;
     case SH7750_MMUCR_A7:
 	s->cpu->mmucr = mem_value;
 	return;
@@ -828,7 +734,11 @@ SH7750State *sh7750_init(CPUSH4State * cpu)
 					      sh7750_mem_read,
 					      sh7750_mem_write, s);
     cpu_register_physical_memory(0x1c000000, 0x04000000, sh7750_io_memory);
-    init_timers(s);
     init_serial_ports(s);
+
+    tmu012_init(0x1fd80000,
+		TMU012_FEAT_TOCR | TMU012_FEAT_3CHAN | TMU012_FEAT_EXTCLK,
+		s->periph_freq);
+    tmu012_init(0x1e100000, 0, s->periph_freq);
     return s;
 }
diff --git a/hw/sh7750_regnames.c b/hw/sh7750_regnames.c
index 5fcb0d6cca..6ae491771f 100644
--- a/hw/sh7750_regnames.c
+++ b/hw/sh7750_regnames.c
@@ -42,18 +42,6 @@ static regname_t regnames[] = {
 	REGNAME(SH7750_RMONAR_A7)
 	REGNAME(SH7750_RCR1_A7)
 	REGNAME(SH7750_RCR2_A7)
-	REGNAME(SH7750_TOCR_A7)
-	REGNAME(SH7750_TSTR_A7)
-	REGNAME(SH7750_TCOR0_A7)
-	REGNAME(SH7750_TCOR1_A7)
-	REGNAME(SH7750_TCOR2_A7)
-	REGNAME(SH7750_TCNT0_A7)
-	REGNAME(SH7750_TCNT1_A7)
-	REGNAME(SH7750_TCNT2_A7)
-	REGNAME(SH7750_TCR0_A7)
-	REGNAME(SH7750_TCR1_A7)
-	REGNAME(SH7750_TCR2_A7)
-	REGNAME(SH7750_TCPR2_A7)
 	REGNAME(SH7750_BCR1_A7)
 	REGNAME(SH7750_BCR2_A7)
 	REGNAME(SH7750_WCR1_A7)
diff --git a/hw/sh7750_regs.h b/hw/sh7750_regs.h
index 6b18ad2e15..85eab43123 100644
--- a/hw/sh7750_regs.h
+++ b/hw/sh7750_regs.h
@@ -524,94 +524,6 @@
 					   year counters are stopped
 					   1 - sec, min, hr, day-of-week, month,
 					   year counters operate normally */
-
-
-/*
- * Timer Unit (TMU)
- */
-/* Timer Output Control Register (byte) - TOCR */
-#define SH7750_TOCR_REGOFS    0xD80000	/* offset */
-#define SH7750_TOCR           SH7750_P4_REG32(SH7750_TOCR_REGOFS)
-#define SH7750_TOCR_A7        SH7750_A7_REG32(SH7750_TOCR_REGOFS)
-#define SH7750_TOCR_TCOE      0x01	/* Timer Clock Pin Control:
-					   0 - TCLK is used as external clock
-					   input or input capture control
-					   1 - TCLK is used as on-chip RTC
-					   output clock pin */
-
-/* Timer Start Register (byte) - TSTR */
-#define SH7750_TSTR_REGOFS    0xD80004	/* offset */
-#define SH7750_TSTR           SH7750_P4_REG32(SH7750_TSTR_REGOFS)
-#define SH7750_TSTR_A7        SH7750_A7_REG32(SH7750_TSTR_REGOFS)
-#define SH7750_TSTR_STR2      0x04	/* TCNT2 performs count operations */
-#define SH7750_TSTR_STR1      0x02	/* TCNT1 performs count operations */
-#define SH7750_TSTR_STR0      0x01	/* TCNT0 performs count operations */
-#define SH7750_TSTR_STR(n)    (1 << (n))
-
-/* Timer Constant Register - TCOR0, TCOR1, TCOR2 */
-#define SH7750_TCOR_REGOFS(n) (0xD80008 + ((n)*12))	/* offset */
-#define SH7750_TCOR(n)        SH7750_P4_REG32(SH7750_TCOR_REGOFS(n))
-#define SH7750_TCOR_A7(n)     SH7750_A7_REG32(SH7750_TCOR_REGOFS(n))
-#define SH7750_TCOR0          SH7750_TCOR(0)
-#define SH7750_TCOR1          SH7750_TCOR(1)
-#define SH7750_TCOR2          SH7750_TCOR(2)
-#define SH7750_TCOR0_A7       SH7750_TCOR_A7(0)
-#define SH7750_TCOR1_A7       SH7750_TCOR_A7(1)
-#define SH7750_TCOR2_A7       SH7750_TCOR_A7(2)
-
-/* Timer Counter Register - TCNT0, TCNT1, TCNT2 */
-#define SH7750_TCNT_REGOFS(n) (0xD8000C + ((n)*12))	/* offset */
-#define SH7750_TCNT(n)        SH7750_P4_REG32(SH7750_TCNT_REGOFS(n))
-#define SH7750_TCNT_A7(n)     SH7750_A7_REG32(SH7750_TCNT_REGOFS(n))
-#define SH7750_TCNT0          SH7750_TCNT(0)
-#define SH7750_TCNT1          SH7750_TCNT(1)
-#define SH7750_TCNT2          SH7750_TCNT(2)
-#define SH7750_TCNT0_A7       SH7750_TCNT_A7(0)
-#define SH7750_TCNT1_A7       SH7750_TCNT_A7(1)
-#define SH7750_TCNT2_A7       SH7750_TCNT_A7(2)
-
-/* Timer Control Register (half) - TCR0, TCR1, TCR2 */
-#define SH7750_TCR_REGOFS(n)  (0xD80010 + ((n)*12))	/* offset */
-#define SH7750_TCR(n)         SH7750_P4_REG32(SH7750_TCR_REGOFS(n))
-#define SH7750_TCR_A7(n)      SH7750_A7_REG32(SH7750_TCR_REGOFS(n))
-#define SH7750_TCR0           SH7750_TCR(0)
-#define SH7750_TCR1           SH7750_TCR(1)
-#define SH7750_TCR2           SH7750_TCR(2)
-#define SH7750_TCR0_A7        SH7750_TCR_A7(0)
-#define SH7750_TCR1_A7        SH7750_TCR_A7(1)
-#define SH7750_TCR2_A7        SH7750_TCR_A7(2)
-
-#define SH7750_TCR2_ICPF       0x200	/* Input Capture Interrupt Flag
-					   (1 - input capture has occured) */
-#define SH7750_TCR_UNF         0x100	/* Underflow flag */
-#define SH7750_TCR2_ICPE       0x0C0	/* Input Capture Control: */
-#define SH7750_TCR2_ICPE_DIS   0x000	/*   Input Capture function is not used */
-#define SH7750_TCR2_ICPE_NOINT 0x080	/*   Input Capture function is used, but
-					   input capture interrupt is not
-					   enabled */
-#define SH7750_TCR2_ICPE_INT   0x0C0	/*   Input Capture function is used,
-					   input capture interrupt enabled */
-#define SH7750_TCR_UNIE        0x020	/* Underflow Interrupt Control
-					   (1 - underflow interrupt enabled) */
-#define SH7750_TCR_CKEG        0x018	/* Clock Edge selection: */
-#define SH7750_TCR_CKEG_RAISE  0x000	/*   Count/capture on rising edge */
-#define SH7750_TCR_CKEG_FALL   0x008	/*   Count/capture on falling edge */
-#define SH7750_TCR_CKEG_BOTH   0x018	/*   Count/capture on both rising and
-					   falling edges */
-#define SH7750_TCR_TPSC         0x007	/* Timer prescaler */
-#define SH7750_TCR_TPSC_DIV4    0x000	/*   Counts on peripheral clock/4 */
-#define SH7750_TCR_TPSC_DIV16   0x001	/*   Counts on peripheral clock/16 */
-#define SH7750_TCR_TPSC_DIV64   0x002	/*   Counts on peripheral clock/64 */
-#define SH7750_TCR_TPSC_DIV256  0x003	/*   Counts on peripheral clock/256 */
-#define SH7750_TCR_TPSC_DIV1024 0x004	/*   Counts on peripheral clock/1024 */
-#define SH7750_TCR_TPSC_RTC     0x006	/*   Counts on on-chip RTC output clk */
-#define SH7750_TCR_TPSC_EXT     0x007	/*   Counts on external clock */
-
-/* Input Capture Register (read-only) - TCPR2 */
-#define SH7750_TCPR2_REGOFS   0xD8002C	/* offset */
-#define SH7750_TCPR2          SH7750_P4_REG32(SH7750_TCPR2_REGOFS)
-#define SH7750_TCPR2_A7       SH7750_A7_REG32(SH7750_TCPR2_REGOFS)
-
 /*
  * Bus State Controller - BSC
  */
diff --git a/hw/sh_timer.c b/hw/sh_timer.c
new file mode 100644
index 0000000000..40f3930cf4
--- /dev/null
+++ b/hw/sh_timer.c
@@ -0,0 +1,323 @@
+/*
+ * SuperH Timer modules.
+ *
+ * Copyright (c) 2007 Magnus Damm
+ * Based on arm_timer.c by Paul Brook
+ * Copyright (c) 2005-2006 CodeSourcery.
+ *
+ * This code is licenced under the GPL.
+ */
+
+#include "vl.h"
+
+//#define DEBUG_TIMER
+
+#define TIMER_TCR_TPSC          (7 << 0)
+#define TIMER_TCR_CKEG          (3 << 3)
+#define TIMER_TCR_UNIE          (1 << 5)
+#define TIMER_TCR_ICPE          (3 << 6)
+#define TIMER_TCR_UNF           (1 << 8)
+#define TIMER_TCR_ICPF          (1 << 9)
+#define TIMER_TCR_RESERVED      (0x3f << 10)
+
+#define TIMER_FEAT_CAPT   (1 << 0)
+#define TIMER_FEAT_EXTCLK (1 << 1)
+
+typedef struct {
+    ptimer_state *timer;
+    uint32_t tcnt;
+    uint32_t tcor;
+    uint32_t tcr;
+    uint32_t tcpr;
+    int freq;
+    int int_level;
+    int feat;
+    int enabled;
+    qemu_irq irq;
+} sh_timer_state;
+
+/* Check all active timers, and schedule the next timer interrupt. */
+
+static void sh_timer_update(sh_timer_state *s)
+{
+#if 0 /* not yet */
+    /* Update interrupts.  */
+    if (s->int_level && (s->tcr & TIMER_TCR_UNIE)) {
+        qemu_irq_raise(s->irq);
+    } else {
+        qemu_irq_lower(s->irq);
+    }
+#endif
+}
+
+uint32_t sh_timer_read(void *opaque, target_phys_addr_t offset)
+{
+    sh_timer_state *s = (sh_timer_state *)opaque;
+
+    switch (offset >> 2) {
+    case 0:
+        return s->tcor;
+    case 1:
+        return ptimer_get_count(s->timer);
+    case 2:
+        return s->tcr | (s->int_level ? TIMER_TCR_UNF : 0);
+    case 3:
+        if (s->feat & TIMER_FEAT_CAPT)
+            return s->tcpr;
+    default:
+        cpu_abort (cpu_single_env, "sh_timer_read: Bad offset %x\n",
+                   (int)offset);
+        return 0;
+    }
+}
+
+static void sh_timer_write(void *opaque, target_phys_addr_t offset,
+                            uint32_t value)
+{
+    sh_timer_state *s = (sh_timer_state *)opaque;
+    int freq;
+
+    switch (offset >> 2) {
+    case 0:
+        s->tcor = value;
+        ptimer_set_limit(s->timer, s->tcor, 0);
+        break;
+    case 1:
+        s->tcnt = value;
+        ptimer_set_count(s->timer, s->tcnt);
+        break;
+    case 2:
+        if (s->enabled) {
+            /* Pause the timer if it is running.  This may cause some
+               inaccuracy dure to rounding, but avoids a whole lot of other
+               messyness.  */
+            ptimer_stop(s->timer);
+        }
+        freq = s->freq;
+        /* ??? Need to recalculate expiry time after changing divisor.  */
+        switch (value & TIMER_TCR_TPSC) {
+        case 0: freq >>= 2; break;
+        case 1: freq >>= 4; break;
+        case 2: freq >>= 6; break;
+        case 3: freq >>= 8; break;
+        case 4: freq >>= 10; break;
+	case 6:
+	case 7: if (s->feat & TIMER_FEAT_EXTCLK) break;
+	default: cpu_abort (cpu_single_env,
+			   "sh_timer_write: Reserved TPSC value\n"); break;
+        }
+        switch ((value & TIMER_TCR_CKEG) >> 3) {
+	case 0: break;
+        case 1:
+        case 2:
+        case 3: if (s->feat & TIMER_FEAT_EXTCLK) break;
+	default: cpu_abort (cpu_single_env,
+			   "sh_timer_write: Reserved CKEG value\n"); break;
+        }
+        switch ((value & TIMER_TCR_ICPE) >> 6) {
+	case 0: break;
+        case 2:
+        case 3: if (s->feat & TIMER_FEAT_CAPT) break;
+	default: cpu_abort (cpu_single_env,
+			   "sh_timer_write: Reserved ICPE value\n"); break;
+        }
+	if ((value & TIMER_TCR_UNF) == 0)
+            s->int_level = 0;
+
+	value &= ~TIMER_TCR_UNF;
+
+	if ((value & TIMER_TCR_ICPF) && (!(s->feat & TIMER_FEAT_CAPT)))
+            cpu_abort (cpu_single_env,
+		       "sh_timer_write: Reserved ICPF value\n");
+
+	value &= ~TIMER_TCR_ICPF; /* capture not supported */
+
+	if (value & TIMER_TCR_RESERVED)
+            cpu_abort (cpu_single_env,
+		       "sh_timer_write: Reserved TCR bits set\n");
+        s->tcr = value;
+        ptimer_set_limit(s->timer, s->tcor, 0);
+        ptimer_set_freq(s->timer, freq);
+        if (s->enabled) {
+            /* Restart the timer if still enabled.  */
+            ptimer_run(s->timer, 0);
+        }
+        break;
+    case 3:
+        if (s->feat & TIMER_FEAT_CAPT) {
+            s->tcpr = value;
+	    break;
+	}
+    default:
+        cpu_abort (cpu_single_env, "sh_timer_write: Bad offset %x\n",
+                   (int)offset);
+    }
+    sh_timer_update(s);
+}
+
+static void sh_timer_start_stop(void *opaque, int enable)
+{
+    sh_timer_state *s = (sh_timer_state *)opaque;
+
+#ifdef DEBUG_TIMER
+    printf("sh_timer_start_stop %d (%d)\n", enable, s->enabled);
+#endif
+
+    if (s->enabled && !enable) {
+        ptimer_stop(s->timer);
+    }
+    if (!s->enabled && enable) {
+        ptimer_run(s->timer, 0);
+    }
+    s->enabled = !!enable;
+
+#ifdef DEBUG_TIMER
+    printf("sh_timer_start_stop done %d\n", s->enabled);
+#endif
+}
+
+static void sh_timer_tick(void *opaque)
+{
+    sh_timer_state *s = (sh_timer_state *)opaque;
+    s->int_level = s->enabled;
+    sh_timer_update(s);
+}
+
+static void *sh_timer_init(uint32_t freq, int feat)
+{
+    sh_timer_state *s;
+    QEMUBH *bh;
+
+    s = (sh_timer_state *)qemu_mallocz(sizeof(sh_timer_state));
+    s->freq = freq;
+    s->feat = feat;
+    s->tcor = 0xffffffff;
+    s->tcnt = 0xffffffff;
+    s->tcpr = 0xdeadbeef;
+    s->tcor = 0;
+    s->enabled = 0;
+
+    bh = qemu_bh_new(sh_timer_tick, s);
+    s->timer = ptimer_init(bh);
+    /* ??? Save/restore.  */
+    return s;
+}
+
+typedef struct {
+    void *timer[3];
+    int level[3];
+    uint32_t tocr;
+    uint32_t tstr;
+    target_phys_addr_t base;
+    int feat;
+} tmu012_state;
+
+static uint32_t tmu012_read(void *opaque, target_phys_addr_t offset)
+{
+    tmu012_state *s = (tmu012_state *)opaque;
+
+#ifdef DEBUG_TIMER
+    printf("tmu012_read 0x%lx\n", (unsigned long) offset);
+#endif
+    offset -= s->base;
+
+    if (offset >= 0x20) {
+        if (!(s->feat & TMU012_FEAT_3CHAN))
+	    cpu_abort (cpu_single_env, "tmu012_write: Bad channel offset %x\n",
+		       (int)offset);
+        return sh_timer_read(s->timer[2], offset - 0x20);
+    }
+
+    if (offset >= 0x14)
+        return sh_timer_read(s->timer[1], offset - 0x14);
+
+    if (offset >= 0x08)
+        return sh_timer_read(s->timer[0], offset - 0x08);
+
+    if (offset == 4)
+        return s->tstr;
+
+    if ((s->feat & TMU012_FEAT_TOCR) && offset == 0)
+        return s->tocr;
+
+    cpu_abort (cpu_single_env, "tmu012_write: Bad offset %x\n",
+	       (int)offset);
+    return 0;
+}
+
+static void tmu012_write(void *opaque, target_phys_addr_t offset,
+                        uint32_t value)
+{
+    tmu012_state *s = (tmu012_state *)opaque;
+
+#ifdef DEBUG_TIMER
+    printf("tmu012_write 0x%lx 0x%08x\n", (unsigned long) offset, value);
+#endif
+    offset -= s->base;
+
+    if (offset >= 0x20) {
+        if (!(s->feat & TMU012_FEAT_3CHAN))
+	    cpu_abort (cpu_single_env, "tmu012_write: Bad channel offset %x\n",
+		       (int)offset);
+        sh_timer_write(s->timer[2], offset - 0x20, value);
+	return;
+    }
+
+    if (offset >= 0x14) {
+        sh_timer_write(s->timer[1], offset - 0x14, value);
+	return;
+    }
+
+    if (offset >= 0x08) {
+        sh_timer_write(s->timer[0], offset - 0x08, value);
+	return;
+    }
+
+    if (offset == 4) {
+        sh_timer_start_stop(s->timer[0], value & (1 << 0));
+        sh_timer_start_stop(s->timer[1], value & (1 << 1));
+        if (s->feat & TMU012_FEAT_3CHAN)
+            sh_timer_start_stop(s->timer[2], value & (1 << 2));
+	else
+            if (value & (1 << 2))
+                cpu_abort (cpu_single_env, "tmu012_write: Bad channel\n");
+
+	s->tstr = value;
+	return;
+    }
+
+    if ((s->feat & TMU012_FEAT_TOCR) && offset == 0) {
+        s->tocr = value & (1 << 0);
+    }
+}
+
+static CPUReadMemoryFunc *tmu012_readfn[] = {
+    tmu012_read,
+    tmu012_read,
+    tmu012_read
+};
+
+static CPUWriteMemoryFunc *tmu012_writefn[] = {
+    tmu012_write,
+    tmu012_write,
+    tmu012_write
+};
+
+void tmu012_init(uint32_t base, int feat, uint32_t freq)
+{
+    int iomemtype;
+    tmu012_state *s;
+    int timer_feat = (feat & TMU012_FEAT_EXTCLK) ? TIMER_FEAT_EXTCLK : 0;
+
+    s = (tmu012_state *)qemu_mallocz(sizeof(tmu012_state));
+    s->base = base;
+    s->feat = feat;
+    s->timer[0] = sh_timer_init(freq, timer_feat);
+    s->timer[1] = sh_timer_init(freq, timer_feat);
+    if (feat & TMU012_FEAT_3CHAN)
+        s->timer[2] = sh_timer_init(freq, timer_feat | TIMER_FEAT_CAPT);
+    iomemtype = cpu_register_io_memory(0, tmu012_readfn,
+                                       tmu012_writefn, s);
+    cpu_register_physical_memory(base, 0x00001000, iomemtype);
+    /* ??? Save/restore.  */
+}
diff --git a/vl.h b/vl.h
index ea7a05e3f2..43adc2450d 100644
--- a/vl.h
+++ b/vl.h
@@ -1517,6 +1517,12 @@ typedef struct {
 
 int sh7750_register_io_device(struct SH7750State *s,
 			      sh7750_io_device * device);
+/* sh_timer.c */
+#define TMU012_FEAT_TOCR   (1 << 0)
+#define TMU012_FEAT_3CHAN  (1 << 1)
+#define TMU012_FEAT_EXTCLK (1 << 2)
+void tmu012_init(uint32_t base, int feat, uint32_t freq);
+
 /* tc58128.c */
 int tc58128_init(struct SH7750State *s, char *zone1, char *zone2);