hw/xilinx_timer.c - qemu - Git at Google

 /*
  * QEMU model of the Xilinx timer block.
  *
  * Copyright (c) 2009 Edgar E. Iglesias.
  *
  * 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 R_TCSR     0
 #define R_TLR      1
 #define R_TCR      2
 #define R_MAX      4

 #define TCSR_MDT        (1<<0)
 #define TCSR_UDT        (1<<1)
 #define TCSR_GENT       (1<<2)
 #define TCSR_CAPT       (1<<3)
 #define TCSR_ARHT       (1<<4)
 #define TCSR_LOAD       (1<<5)
 #define TCSR_ENIT       (1<<6)
 #define TCSR_ENT        (1<<7)
 #define TCSR_TINT       (1<<8)
 #define TCSR_PWMA       (1<<9)
 #define TCSR_ENALL      (1<<10)

 struct xlx_timer
 {
     QEMUBH *bh;
     ptimer_state *ptimer;
     void *parent;
     int nr; /* for debug.  */

     unsigned long timer_div;

     uint32_t regs[R_MAX];
 };

 struct timerblock
 {
     SysBusDevice busdev;
     qemu_irq irq;
     uint32_t nr_timers;
     uint32_t freq_hz;
     struct xlx_timer *timers;
 };

 static inline unsigned int timer_from_addr(target_phys_addr_t addr)
 {
     /* Timers get a 4x32bit control reg area each.  */
     return addr >> 2;
 }

 static void timer_update_irq(struct timerblock *t)
 {
     unsigned int i, irq = 0;
     uint32_t csr;

     for (i = 0; i < t->nr_timers; i++) {
         csr = t->timers[i].regs[R_TCSR];
         irq |= (csr & TCSR_TINT) && (csr & TCSR_ENIT);
     }

     /* All timers within the same slave share a single IRQ line.  */
     qemu_set_irq(t->irq, !!irq);
 }

 static uint32_t timer_readl (void *opaque, target_phys_addr_t addr)
 {
     struct timerblock *t = opaque;
     struct xlx_timer *xt;
     uint32_t r = 0;
     unsigned int timer;

     addr >>= 2;
     timer = timer_from_addr(addr);
     xt = &t->timers[timer];
     /* Further decoding to address a specific timers reg.  */
     addr &= 0x3;
     switch (addr)
     {
         case R_TCR:
                 r = ptimer_get_count(xt->ptimer);
                 if (!(xt->regs[R_TCSR] & TCSR_UDT))
                     r = ~r;
                 D(qemu_log("xlx_timer t=%d read counter=%x udt=%d\n",
                          timer, r, xt->regs[R_TCSR] & TCSR_UDT));
             break;
         default:
             if (addr < ARRAY_SIZE(xt->regs))
                 r = xt->regs[addr];
             break;

     }
     D(printf("%s timer=%d %x=%x\n", __func__, timer, addr * 4, r));
     return r;
 }

 static void timer_enable(struct xlx_timer *xt)
 {
     uint64_t count;

     D(printf("%s timer=%d down=%d\n", __func__,
               xt->nr, xt->regs[R_TCSR] & TCSR_UDT));

     ptimer_stop(xt->ptimer);

     if (xt->regs[R_TCSR] & TCSR_UDT)
         count = xt->regs[R_TLR];
     else
         count = ~0 - xt->regs[R_TLR];
     ptimer_set_count(xt->ptimer, count);
     ptimer_run(xt->ptimer, 1);
 }

 static void
 timer_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
 {
     struct timerblock *t = opaque;
     struct xlx_timer *xt;
     unsigned int timer;

     addr >>= 2;
     timer = timer_from_addr(addr);
     xt = &t->timers[timer];
     D(printf("%s addr=%x val=%x (timer=%d off=%d)\n",
              __func__, addr * 4, value, timer, addr & 3));
     /* Further decoding to address a specific timers reg.  */
     addr &= 3;
     switch (addr)
     {
         case R_TCSR:
             if (value & TCSR_TINT)
                 value &= ~TCSR_TINT;

             xt->regs[addr] = value;
             if (value & TCSR_ENT)
                 timer_enable(xt);
             break;

         default:
             if (addr < ARRAY_SIZE(xt->regs))
                 xt->regs[addr] = value;
             break;
     }
     timer_update_irq(t);
 }

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

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

 static void timer_hit(void *opaque)
 {
     struct xlx_timer *xt = opaque;
     struct timerblock *t = xt->parent;
     D(printf("%s %d\n", __func__, timer));
     xt->regs[R_TCSR] |= TCSR_TINT;

     if (xt->regs[R_TCSR] & TCSR_ARHT)
         timer_enable(xt);
     timer_update_irq(t);
 }

 static int xilinx_timer_init(SysBusDevice *dev)
 {
     struct timerblock *t = FROM_SYSBUS(typeof (*t), dev);
     unsigned int i;
     int timer_regs;

     /* All timers share a single irq line.  */
     sysbus_init_irq(dev, &t->irq);

     /* Init all the ptimers.  */
     t->timers = qemu_mallocz(sizeof t->timers[0] * t->nr_timers);
     for (i = 0; i < t->nr_timers; i++) {
         struct xlx_timer *xt = &t->timers[i];

         xt->parent = t;
         xt->nr = i;
         xt->bh = qemu_bh_new(timer_hit, xt);
         xt->ptimer = ptimer_init(xt->bh);
         ptimer_set_freq(xt->ptimer, t->freq_hz);
     }

     timer_regs = cpu_register_io_memory(timer_read, timer_write, t,
                                         DEVICE_NATIVE_ENDIAN);
     sysbus_init_mmio(dev, R_MAX * 4 * t->nr_timers, timer_regs);
     return 0;
 }

 static SysBusDeviceInfo xilinx_timer_info = {
     .init = xilinx_timer_init,
     .qdev.name  = "xilinx,timer",
     .qdev.size  = sizeof(struct timerblock),
     .qdev.props = (Property[]) {
         DEFINE_PROP_UINT32("frequency", struct timerblock, freq_hz,   0),
         DEFINE_PROP_UINT32("nr-timers", struct timerblock, nr_timers, 0),
         DEFINE_PROP_END_OF_LIST(),
     }
 };

 static void xilinx_timer_register(void)
 {
     sysbus_register_withprop(&xilinx_timer_info);
 }

 device_init(xilinx_timer_register)
	/*
	* QEMU model of the Xilinx timer block.
	*
	* Copyright (c) 2009 Edgar E. Iglesias.
	*
	* 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 R_TCSR 0
	#define R_TLR 1
	#define R_TCR 2
	#define R_MAX 4

	#define TCSR_MDT (1<<0)
	#define TCSR_UDT (1<<1)
	#define TCSR_GENT (1<<2)
	#define TCSR_CAPT (1<<3)
	#define TCSR_ARHT (1<<4)
	#define TCSR_LOAD (1<<5)
	#define TCSR_ENIT (1<<6)
	#define TCSR_ENT (1<<7)
	#define TCSR_TINT (1<<8)
	#define TCSR_PWMA (1<<9)
	#define TCSR_ENALL (1<<10)

	struct xlx_timer
	{
	QEMUBH *bh;
	ptimer_state *ptimer;
	void *parent;
	int nr; /* for debug. */

	unsigned long timer_div;

	uint32_t regs[R_MAX];
	};

	struct timerblock
	{
	SysBusDevice busdev;
	qemu_irq irq;
	uint32_t nr_timers;
	uint32_t freq_hz;
	struct xlx_timer *timers;
	};

	static inline unsigned int timer_from_addr(target_phys_addr_t addr)
	{
	/* Timers get a 4x32bit control reg area each. */
	return addr >> 2;
	}

	static void timer_update_irq(struct timerblock *t)
	{
	unsigned int i, irq = 0;
	uint32_t csr;

	for (i = 0; i < t->nr_timers; i++) {
	csr = t->timers[i].regs[R_TCSR];
	irq \|= (csr & TCSR_TINT) && (csr & TCSR_ENIT);
	}

	/* All timers within the same slave share a single IRQ line. */
	qemu_set_irq(t->irq, !!irq);
	}

	static uint32_t timer_readl (void *opaque, target_phys_addr_t addr)
	{
	struct timerblock *t = opaque;
	struct xlx_timer *xt;
	uint32_t r = 0;
	unsigned int timer;

	addr >>= 2;
	timer = timer_from_addr(addr);
	xt = &t->timers[timer];
	/* Further decoding to address a specific timers reg. */
	addr &= 0x3;
	switch (addr)
	{
	case R_TCR:
	r = ptimer_get_count(xt->ptimer);
	if (!(xt->regs[R_TCSR] & TCSR_UDT))
	r = ~r;
	D(qemu_log("xlx_timer t=%d read counter=%x udt=%d\n",
	timer, r, xt->regs[R_TCSR] & TCSR_UDT));
	break;
	default:
	if (addr < ARRAY_SIZE(xt->regs))
	r = xt->regs[addr];
	break;

	}
	D(printf("%s timer=%d %x=%x\n", __func__, timer, addr * 4, r));
	return r;
	}

	static void timer_enable(struct xlx_timer *xt)
	{
	uint64_t count;

	D(printf("%s timer=%d down=%d\n", __func__,
	xt->nr, xt->regs[R_TCSR] & TCSR_UDT));

	ptimer_stop(xt->ptimer);

	if (xt->regs[R_TCSR] & TCSR_UDT)
	count = xt->regs[R_TLR];
	else
	count = ~0 - xt->regs[R_TLR];
	ptimer_set_count(xt->ptimer, count);
	ptimer_run(xt->ptimer, 1);
	}

	static void
	timer_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
	{
	struct timerblock *t = opaque;
	struct xlx_timer *xt;
	unsigned int timer;

	addr >>= 2;
	timer = timer_from_addr(addr);
	xt = &t->timers[timer];
	D(printf("%s addr=%x val=%x (timer=%d off=%d)\n",
	__func__, addr * 4, value, timer, addr & 3));
	/* Further decoding to address a specific timers reg. */
	addr &= 3;
	switch (addr)
	{
	case R_TCSR:
	if (value & TCSR_TINT)
	value &= ~TCSR_TINT;

	xt->regs[addr] = value;
	if (value & TCSR_ENT)
	timer_enable(xt);
	break;

	default:
	if (addr < ARRAY_SIZE(xt->regs))
	xt->regs[addr] = value;
	break;
	}
	timer_update_irq(t);
	}

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

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

	static void timer_hit(void *opaque)
	{
	struct xlx_timer *xt = opaque;
	struct timerblock *t = xt->parent;
	D(printf("%s %d\n", __func__, timer));
	xt->regs[R_TCSR] \|= TCSR_TINT;

	if (xt->regs[R_TCSR] & TCSR_ARHT)
	timer_enable(xt);
	timer_update_irq(t);
	}

	static int xilinx_timer_init(SysBusDevice *dev)
	{
	struct timerblock t = FROM_SYSBUS(typeof (t), dev);
	unsigned int i;
	int timer_regs;

	/* All timers share a single irq line. */
	sysbus_init_irq(dev, &t->irq);

	/* Init all the ptimers. */
	t->timers = qemu_mallocz(sizeof t->timers[0] * t->nr_timers);
	for (i = 0; i < t->nr_timers; i++) {
	struct xlx_timer *xt = &t->timers[i];

	xt->parent = t;
	xt->nr = i;
	xt->bh = qemu_bh_new(timer_hit, xt);
	xt->ptimer = ptimer_init(xt->bh);
	ptimer_set_freq(xt->ptimer, t->freq_hz);
	}

	timer_regs = cpu_register_io_memory(timer_read, timer_write, t,
	DEVICE_NATIVE_ENDIAN);
	sysbus_init_mmio(dev, R_MAX * 4 * t->nr_timers, timer_regs);
	return 0;
	}

	static SysBusDeviceInfo xilinx_timer_info = {
	.init = xilinx_timer_init,
	.qdev.name = "xilinx,timer",
	.qdev.size = sizeof(struct timerblock),
	.qdev.props = (Property[]) {
	DEFINE_PROP_UINT32("frequency", struct timerblock, freq_hz, 0),
	DEFINE_PROP_UINT32("nr-timers", struct timerblock, nr_timers, 0),
	DEFINE_PROP_END_OF_LIST(),
	}
	};

	static void xilinx_timer_register(void)
	{
	sysbus_register_withprop(&xilinx_timer_info);
	}

	device_init(xilinx_timer_register)