hw/etraxfs_timer.c - qemu - Git at Google

 /*
  * QEMU ETRAX Timers
  *
  * Copyright (c) 2007 Edgar E. Iglesias, Axis Communications AB.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
 #include "sysbus.h"
 #include "sysemu.h"
 #include "qemu-timer.h"

 #define D(x)

 #define RW_TMR0_DIV   0x00
 #define R_TMR0_DATA   0x04
 #define RW_TMR0_CTRL  0x08
 #define RW_TMR1_DIV   0x10
 #define R_TMR1_DATA   0x14
 #define RW_TMR1_CTRL  0x18
 #define R_TIME        0x38
 #define RW_WD_CTRL    0x40
 #define R_WD_STAT     0x44
 #define RW_INTR_MASK  0x48
 #define RW_ACK_INTR   0x4c
 #define R_INTR        0x50
 #define R_MASKED_INTR 0x54

 struct etrax_timer {
     SysBusDevice busdev;
     qemu_irq irq;
     qemu_irq nmi;

     QEMUBH *bh_t0;
     QEMUBH *bh_t1;
     QEMUBH *bh_wd;
     ptimer_state *ptimer_t0;
     ptimer_state *ptimer_t1;
     ptimer_state *ptimer_wd;

     int wd_hits;

     /* Control registers.  */
     uint32_t rw_tmr0_div;
     uint32_t r_tmr0_data;
     uint32_t rw_tmr0_ctrl;

     uint32_t rw_tmr1_div;
     uint32_t r_tmr1_data;
     uint32_t rw_tmr1_ctrl;

     uint32_t rw_wd_ctrl;

     uint32_t rw_intr_mask;
     uint32_t rw_ack_intr;
     uint32_t r_intr;
     uint32_t r_masked_intr;
 };

 static uint32_t timer_readl (void *opaque, a_target_phys_addr addr)
 {
     struct etrax_timer *t = opaque;
     uint32_t r = 0;

     switch (addr) {
     case R_TMR0_DATA:
         r = ptimer_get_count(t->ptimer_t0);
         break;
     case R_TMR1_DATA:
         r = ptimer_get_count(t->ptimer_t1);
         break;
     case R_TIME:
         r = qemu_get_clock(vm_clock) / 10;
         break;
     case RW_INTR_MASK:
         r = t->rw_intr_mask;
         break;
     case R_MASKED_INTR:
         r = t->r_intr & t->rw_intr_mask;
         break;
     default:
         D(printf ("%s %x\n", __func__, addr));
         break;
     }
     return r;
 }

 #define TIMER_SLOWDOWN 1
 static void update_ctrl(struct etrax_timer *t, int tnum)
 {
     unsigned int op;
     unsigned int freq;
     unsigned int freq_hz;
     unsigned int div;
     uint32_t ctrl;

     ptimer_state *timer;

     if (tnum == 0) {
         ctrl = t->rw_tmr0_ctrl;
         div = t->rw_tmr0_div;
         timer = t->ptimer_t0;
     } else {
         ctrl = t->rw_tmr1_ctrl;
         div = t->rw_tmr1_div;
         timer = t->ptimer_t1;
     }


     op = ctrl & 3;
     freq = ctrl >> 2;
     freq_hz = 32000000;

     switch (freq)
     {
     case 0:
     case 1:
         D(printf ("extern or disabled timer clock?\n"));
         break;
     case 4: freq_hz =  29493000; break;
     case 5: freq_hz =  32000000; break;
     case 6: freq_hz =  32768000; break;
     case 7: freq_hz = 100000000; break;
     default:
         abort();
         break;
     }

     D(printf ("freq_hz=%d div=%d\n", freq_hz, div));
     div = div * TIMER_SLOWDOWN;
     div /= 1000;
     freq_hz /= 1000;
     ptimer_set_freq(timer, freq_hz);
     ptimer_set_limit(timer, div, 0);

     switch (op)
     {
         case 0:
             /* Load.  */
             ptimer_set_limit(timer, div, 1);
             break;
         case 1:
             /* Hold.  */
             ptimer_stop(timer);
             break;
         case 2:
             /* Run.  */
             ptimer_run(timer, 0);
             break;
         default:
             abort();
             break;
     }
 }

 static void timer_update_irq(struct etrax_timer *t)
 {
     t->r_intr &= ~(t->rw_ack_intr);
     t->r_masked_intr = t->r_intr & t->rw_intr_mask;

     D(printf("%s: masked_intr=%x\n", __func__, t->r_masked_intr));
     qemu_set_irq(t->irq, !!t->r_masked_intr);
 }

 static void timer0_hit(void *opaque)
 {
     struct etrax_timer *t = opaque;
     t->r_intr |= 1;
     timer_update_irq(t);
 }

 static void timer1_hit(void *opaque)
 {
     struct etrax_timer *t = opaque;
     t->r_intr |= 2;
     timer_update_irq(t);
 }

 static void watchdog_hit(void *opaque)
 {
     struct etrax_timer *t = opaque;
     if (t->wd_hits == 0) {
         /* real hw gives a single tick before reseting but we are
            a bit friendlier to compensate for our slower execution.  */
         ptimer_set_count(t->ptimer_wd, 10);
         ptimer_run(t->ptimer_wd, 1);
         qemu_irq_raise(t->nmi);
     }
     else
         qemu_system_reset_request();

     t->wd_hits++;
 }

 static inline void timer_watchdog_update(struct etrax_timer *t, uint32_t value)
 {
     unsigned int wd_en = t->rw_wd_ctrl & (1 << 8);
     unsigned int wd_key = t->rw_wd_ctrl >> 9;
     unsigned int wd_cnt = t->rw_wd_ctrl & 511;
     unsigned int new_key = value >> 9 & ((1 << 7) - 1);
     unsigned int new_cmd = (value >> 8) & 1;

     /* If the watchdog is enabled, they written key must match the
        complement of the previous.  */
     wd_key = ~wd_key & ((1 << 7) - 1);

     if (wd_en && wd_key != new_key)
         return;

     D(printf("en=%d new_key=%x oldkey=%x cmd=%d cnt=%d\n",
          wd_en, new_key, wd_key, new_cmd, wd_cnt));

     if (t->wd_hits)
         qemu_irq_lower(t->nmi);

     t->wd_hits = 0;

     ptimer_set_freq(t->ptimer_wd, 760);
     if (wd_cnt == 0)
         wd_cnt = 256;
     ptimer_set_count(t->ptimer_wd, wd_cnt);
     if (new_cmd)
         ptimer_run(t->ptimer_wd, 1);
     else
         ptimer_stop(t->ptimer_wd);

     t->rw_wd_ctrl = value;
 }

 static void
 timer_writel (void *opaque, a_target_phys_addr addr, uint32_t value)
 {
     struct etrax_timer *t = opaque;

     switch (addr)
     {
         case RW_TMR0_DIV:
             t->rw_tmr0_div = value;
             break;
         case RW_TMR0_CTRL:
             D(printf ("RW_TMR0_CTRL=%x\n", value));
             t->rw_tmr0_ctrl = value;
             update_ctrl(t, 0);
             break;
         case RW_TMR1_DIV:
             t->rw_tmr1_div = value;
             break;
         case RW_TMR1_CTRL:
             D(printf ("RW_TMR1_CTRL=%x\n", value));
             t->rw_tmr1_ctrl = value;
             update_ctrl(t, 1);
             break;
         case RW_INTR_MASK:
             D(printf ("RW_INTR_MASK=%x\n", value));
             t->rw_intr_mask = value;
             timer_update_irq(t);
             break;
         case RW_WD_CTRL:
             timer_watchdog_update(t, value);
             break;
         case RW_ACK_INTR:
             t->rw_ack_intr = value;
             timer_update_irq(t);
             t->rw_ack_intr = 0;
             break;
         default:
             printf ("%s " TARGET_FMT_plx " %x\n",
                 __func__, addr, value);
             break;
     }
 }

 static CPUReadMemoryFunc * const timer_read[] = {
     NULL, NULL,
     &timer_readl,
 };

 static CPUWriteMemoryFunc * const timer_write[] = {
     NULL, NULL,
     &timer_writel,
 };

 static void etraxfs_timer_reset(void *opaque)
 {
     struct etrax_timer *t = opaque;

     ptimer_stop(t->ptimer_t0);
     ptimer_stop(t->ptimer_t1);
     ptimer_stop(t->ptimer_wd);
     t->rw_wd_ctrl = 0;
     t->r_intr = 0;
     t->rw_intr_mask = 0;
     qemu_irq_lower(t->irq);
 }

 static int etraxfs_timer_init(SysBusDevice *dev)
 {
     struct etrax_timer *t = FROM_SYSBUS(typeof (*t), dev);
     int timer_regs;

     t->bh_t0 = qemu_bh_new(timer0_hit, t);
     t->bh_t1 = qemu_bh_new(timer1_hit, t);
     t->bh_wd = qemu_bh_new(watchdog_hit, t);
     t->ptimer_t0 = ptimer_init(t->bh_t0);
     t->ptimer_t1 = ptimer_init(t->bh_t1);
     t->ptimer_wd = ptimer_init(t->bh_wd);

     sysbus_init_irq(dev, &t->irq);
     sysbus_init_irq(dev, &t->nmi);

     timer_regs = cpu_register_io_memory(timer_read, timer_write, t);
     sysbus_init_mmio(dev, 0x5c, timer_regs);

     qemu_register_reset(etraxfs_timer_reset, t);
     return 0;
 }

 static void etraxfs_timer_register(void)
 {
     sysbus_register_dev("etraxfs,timer", sizeof (struct etrax_timer),
                         etraxfs_timer_init);
 }

 device_init(etraxfs_timer_register)
	/*
	* QEMU ETRAX Timers
	*
	* Copyright (c) 2007 Edgar E. Iglesias, Axis Communications AB.
	*
	* Permission is hereby granted, free of charge, to any person obtaining a copy
	* of this software and associated documentation files (the "Software"), to deal
	* in the Software without restriction, including without limitation the rights
	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	* copies of the Software, and to permit persons to whom the Software is
	* furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	* THE SOFTWARE.
	*/
	#include "sysbus.h"
	#include "sysemu.h"
	#include "qemu-timer.h"

	#define D(x)

	#define RW_TMR0_DIV 0x00
	#define R_TMR0_DATA 0x04
	#define RW_TMR0_CTRL 0x08
	#define RW_TMR1_DIV 0x10
	#define R_TMR1_DATA 0x14
	#define RW_TMR1_CTRL 0x18
	#define R_TIME 0x38
	#define RW_WD_CTRL 0x40
	#define R_WD_STAT 0x44
	#define RW_INTR_MASK 0x48
	#define RW_ACK_INTR 0x4c
	#define R_INTR 0x50
	#define R_MASKED_INTR 0x54

	struct etrax_timer {
	SysBusDevice busdev;
	qemu_irq irq;
	qemu_irq nmi;

	QEMUBH *bh_t0;
	QEMUBH *bh_t1;
	QEMUBH *bh_wd;
	ptimer_state *ptimer_t0;
	ptimer_state *ptimer_t1;
	ptimer_state *ptimer_wd;

	int wd_hits;

	/* Control registers. */
	uint32_t rw_tmr0_div;
	uint32_t r_tmr0_data;
	uint32_t rw_tmr0_ctrl;

	uint32_t rw_tmr1_div;
	uint32_t r_tmr1_data;
	uint32_t rw_tmr1_ctrl;

	uint32_t rw_wd_ctrl;

	uint32_t rw_intr_mask;
	uint32_t rw_ack_intr;
	uint32_t r_intr;
	uint32_t r_masked_intr;
	};

	static uint32_t timer_readl (void *opaque, a_target_phys_addr addr)
	{
	struct etrax_timer *t = opaque;
	uint32_t r = 0;

	switch (addr) {
	case R_TMR0_DATA:
	r = ptimer_get_count(t->ptimer_t0);
	break;
	case R_TMR1_DATA:
	r = ptimer_get_count(t->ptimer_t1);
	break;
	case R_TIME:
	r = qemu_get_clock(vm_clock) / 10;
	break;
	case RW_INTR_MASK:
	r = t->rw_intr_mask;
	break;
	case R_MASKED_INTR:
	r = t->r_intr & t->rw_intr_mask;
	break;
	default:
	D(printf ("%s %x\n", __func__, addr));
	break;
	}
	return r;
	}

	#define TIMER_SLOWDOWN 1
	static void update_ctrl(struct etrax_timer *t, int tnum)
	{
	unsigned int op;
	unsigned int freq;
	unsigned int freq_hz;
	unsigned int div;
	uint32_t ctrl;

	ptimer_state *timer;

	if (tnum == 0) {
	ctrl = t->rw_tmr0_ctrl;
	div = t->rw_tmr0_div;
	timer = t->ptimer_t0;
	} else {
	ctrl = t->rw_tmr1_ctrl;
	div = t->rw_tmr1_div;
	timer = t->ptimer_t1;
	}


	op = ctrl & 3;
	freq = ctrl >> 2;
	freq_hz = 32000000;

	switch (freq)
	{
	case 0:
	case 1:
	D(printf ("extern or disabled timer clock?\n"));
	break;
	case 4: freq_hz = 29493000; break;
	case 5: freq_hz = 32000000; break;
	case 6: freq_hz = 32768000; break;
	case 7: freq_hz = 100000000; break;
	default:
	abort();
	break;
	}

	D(printf ("freq_hz=%d div=%d\n", freq_hz, div));
	div = div * TIMER_SLOWDOWN;
	div /= 1000;
	freq_hz /= 1000;
	ptimer_set_freq(timer, freq_hz);
	ptimer_set_limit(timer, div, 0);

	switch (op)
	{
	case 0:
	/* Load. */
	ptimer_set_limit(timer, div, 1);
	break;
	case 1:
	/* Hold. */
	ptimer_stop(timer);
	break;
	case 2:
	/* Run. */
	ptimer_run(timer, 0);
	break;
	default:
	abort();
	break;
	}
	}

	static void timer_update_irq(struct etrax_timer *t)
	{
	t->r_intr &= ~(t->rw_ack_intr);
	t->r_masked_intr = t->r_intr & t->rw_intr_mask;

	D(printf("%s: masked_intr=%x\n", __func__, t->r_masked_intr));
	qemu_set_irq(t->irq, !!t->r_masked_intr);
	}

	static void timer0_hit(void *opaque)
	{
	struct etrax_timer *t = opaque;
	t->r_intr \|= 1;
	timer_update_irq(t);
	}

	static void timer1_hit(void *opaque)
	{
	struct etrax_timer *t = opaque;
	t->r_intr \|= 2;
	timer_update_irq(t);
	}

	static void watchdog_hit(void *opaque)
	{
	struct etrax_timer *t = opaque;
	if (t->wd_hits == 0) {
	/* real hw gives a single tick before reseting but we are
	a bit friendlier to compensate for our slower execution. */
	ptimer_set_count(t->ptimer_wd, 10);
	ptimer_run(t->ptimer_wd, 1);
	qemu_irq_raise(t->nmi);
	}
	else
	qemu_system_reset_request();

	t->wd_hits++;
	}

	static inline void timer_watchdog_update(struct etrax_timer *t, uint32_t value)
	{
	unsigned int wd_en = t->rw_wd_ctrl & (1 << 8);
	unsigned int wd_key = t->rw_wd_ctrl >> 9;
	unsigned int wd_cnt = t->rw_wd_ctrl & 511;
	unsigned int new_key = value >> 9 & ((1 << 7) - 1);
	unsigned int new_cmd = (value >> 8) & 1;

	/* If the watchdog is enabled, they written key must match the
	complement of the previous. */
	wd_key = ~wd_key & ((1 << 7) - 1);

	if (wd_en && wd_key != new_key)
	return;

	D(printf("en=%d new_key=%x oldkey=%x cmd=%d cnt=%d\n",
	wd_en, new_key, wd_key, new_cmd, wd_cnt));

	if (t->wd_hits)
	qemu_irq_lower(t->nmi);

	t->wd_hits = 0;

	ptimer_set_freq(t->ptimer_wd, 760);
	if (wd_cnt == 0)
	wd_cnt = 256;
	ptimer_set_count(t->ptimer_wd, wd_cnt);
	if (new_cmd)
	ptimer_run(t->ptimer_wd, 1);
	else
	ptimer_stop(t->ptimer_wd);

	t->rw_wd_ctrl = value;
	}

	static void
	timer_writel (void *opaque, a_target_phys_addr addr, uint32_t value)
	{
	struct etrax_timer *t = opaque;

	switch (addr)
	{
	case RW_TMR0_DIV:
	t->rw_tmr0_div = value;
	break;
	case RW_TMR0_CTRL:
	D(printf ("RW_TMR0_CTRL=%x\n", value));
	t->rw_tmr0_ctrl = value;
	update_ctrl(t, 0);
	break;
	case RW_TMR1_DIV:
	t->rw_tmr1_div = value;
	break;
	case RW_TMR1_CTRL:
	D(printf ("RW_TMR1_CTRL=%x\n", value));
	t->rw_tmr1_ctrl = value;
	update_ctrl(t, 1);
	break;
	case RW_INTR_MASK:
	D(printf ("RW_INTR_MASK=%x\n", value));
	t->rw_intr_mask = value;
	timer_update_irq(t);
	break;
	case RW_WD_CTRL:
	timer_watchdog_update(t, value);
	break;
	case RW_ACK_INTR:
	t->rw_ack_intr = value;
	timer_update_irq(t);
	t->rw_ack_intr = 0;
	break;
	default:
	printf ("%s " TARGET_FMT_plx " %x\n",
	__func__, addr, value);
	break;
	}
	}

	static CPUReadMemoryFunc * const timer_read[] = {
	NULL, NULL,
	&timer_readl,
	};

	static CPUWriteMemoryFunc * const timer_write[] = {
	NULL, NULL,
	&timer_writel,
	};

	static void etraxfs_timer_reset(void *opaque)
	{
	struct etrax_timer *t = opaque;

	ptimer_stop(t->ptimer_t0);
	ptimer_stop(t->ptimer_t1);
	ptimer_stop(t->ptimer_wd);
	t->rw_wd_ctrl = 0;
	t->r_intr = 0;
	t->rw_intr_mask = 0;
	qemu_irq_lower(t->irq);
	}

	static int etraxfs_timer_init(SysBusDevice *dev)
	{
	struct etrax_timer t = FROM_SYSBUS(typeof (t), dev);
	int timer_regs;

	t->bh_t0 = qemu_bh_new(timer0_hit, t);
	t->bh_t1 = qemu_bh_new(timer1_hit, t);
	t->bh_wd = qemu_bh_new(watchdog_hit, t);
	t->ptimer_t0 = ptimer_init(t->bh_t0);
	t->ptimer_t1 = ptimer_init(t->bh_t1);
	t->ptimer_wd = ptimer_init(t->bh_wd);

	sysbus_init_irq(dev, &t->irq);
	sysbus_init_irq(dev, &t->nmi);

	timer_regs = cpu_register_io_memory(timer_read, timer_write, t);
	sysbus_init_mmio(dev, 0x5c, timer_regs);

	qemu_register_reset(etraxfs_timer_reset, t);
	return 0;
	}

	static void etraxfs_timer_register(void)
	{
	sysbus_register_dev("etraxfs,timer", sizeof (struct etrax_timer),
	etraxfs_timer_init);
	}

	device_init(etraxfs_timer_register)