hw/milkymist-sysctl.c - qemu - Git at Google

 /*
  *  QEMU model of the Milkymist System Controller.
  *
  *  Copyright (c) 2010 Michael Walle <michael@walle.cc>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  *
  *
  * Specification available at:
  *   http://www.milkymist.org/socdoc/sysctl.pdf
  */

 #include "hw.h"
 #include "sysbus.h"
 #include "sysemu.h"
 #include "trace.h"
 #include "qemu-timer.h"
 #include "qemu-error.h"

 enum {
     CTRL_ENABLE      = (1<<0),
     CTRL_AUTORESTART = (1<<1),
 };

 enum {
     ICAP_READY       = (1<<0),
 };

 enum {
     R_GPIO_IN = 0,
     R_GPIO_OUT,
     R_GPIO_INTEN,
     R_RESERVED0,
     R_TIMER0_CONTROL,
     R_TIMER0_COMPARE,
     R_TIMER0_COUNTER,
     R_RESERVED1,
     R_TIMER1_CONTROL,
     R_TIMER1_COMPARE,
     R_TIMER1_COUNTER,
     R_RESERVED2,
     R_RESERVED3,
     R_ICAP,
     R_CAPABILITIES,
     R_SYSTEM_ID,
     R_MAX
 };

 struct MilkymistSysctlState {
     SysBusDevice busdev;

     QEMUBH *bh0;
     QEMUBH *bh1;
     ptimer_state *ptimer0;
     ptimer_state *ptimer1;

     uint32_t freq_hz;
     uint32_t capabilities;
     uint32_t systemid;
     uint32_t strappings;

     uint32_t regs[R_MAX];

     qemu_irq gpio_irq;
     qemu_irq timer0_irq;
     qemu_irq timer1_irq;
 };
 typedef struct MilkymistSysctlState MilkymistSysctlState;

 static void sysctl_icap_write(MilkymistSysctlState *s, uint32_t value)
 {
     trace_milkymist_sysctl_icap_write(value);
     switch (value & 0xffff) {
     case 0x000e:
         qemu_system_shutdown_request();
         break;
     }
 }

 static uint32_t sysctl_read(void *opaque, target_phys_addr_t addr)
 {
     MilkymistSysctlState *s = opaque;
     uint32_t r = 0;

     addr >>= 2;
     switch (addr) {
     case R_TIMER0_COUNTER:
         r = (uint32_t)ptimer_get_count(s->ptimer0);
         /* milkymist timer counts up */
         r = s->regs[R_TIMER0_COMPARE] - r;
         break;
     case R_TIMER1_COUNTER:
         r = (uint32_t)ptimer_get_count(s->ptimer1);
         /* milkymist timer counts up */
         r = s->regs[R_TIMER1_COMPARE] - r;
         break;
     case R_GPIO_IN:
     case R_GPIO_OUT:
     case R_GPIO_INTEN:
     case R_TIMER0_CONTROL:
     case R_TIMER0_COMPARE:
     case R_TIMER1_CONTROL:
     case R_TIMER1_COMPARE:
     case R_ICAP:
     case R_CAPABILITIES:
     case R_SYSTEM_ID:
         r = s->regs[addr];
         break;

     default:
         error_report("milkymist_sysctl: read access to unkown register 0x"
                 TARGET_FMT_plx, addr << 2);
         break;
     }

     trace_milkymist_sysctl_memory_read(addr << 2, r);

     return r;
 }

 static void sysctl_write(void *opaque, target_phys_addr_t addr, uint32_t value)
 {
     MilkymistSysctlState *s = opaque;

     trace_milkymist_sysctl_memory_write(addr, value);

     addr >>= 2;
     switch (addr) {
     case R_GPIO_OUT:
     case R_GPIO_INTEN:
     case R_TIMER0_COUNTER:
     case R_TIMER1_COUNTER:
         s->regs[addr] = value;
         break;
     case R_TIMER0_COMPARE:
         ptimer_set_limit(s->ptimer0, value, 0);
         s->regs[addr] = value;
         break;
     case R_TIMER1_COMPARE:
         ptimer_set_limit(s->ptimer1, value, 0);
         s->regs[addr] = value;
         break;
     case R_TIMER0_CONTROL:
         s->regs[addr] = value;
         if (s->regs[R_TIMER0_CONTROL] & CTRL_ENABLE) {
             trace_milkymist_sysctl_start_timer0();
             ptimer_set_count(s->ptimer0,
                     s->regs[R_TIMER0_COMPARE] - s->regs[R_TIMER0_COUNTER]);
             ptimer_run(s->ptimer0, 0);
         } else {
             trace_milkymist_sysctl_stop_timer0();
             ptimer_stop(s->ptimer0);
         }
         break;
     case R_TIMER1_CONTROL:
         s->regs[addr] = value;
         if (s->regs[R_TIMER1_CONTROL] & CTRL_ENABLE) {
             trace_milkymist_sysctl_start_timer1();
             ptimer_set_count(s->ptimer1,
                     s->regs[R_TIMER1_COMPARE] - s->regs[R_TIMER1_COUNTER]);
             ptimer_run(s->ptimer1, 0);
         } else {
             trace_milkymist_sysctl_stop_timer1();
             ptimer_stop(s->ptimer1);
         }
         break;
     case R_ICAP:
         sysctl_icap_write(s, value);
         break;
     case R_SYSTEM_ID:
         qemu_system_reset_request();
         break;

     case R_GPIO_IN:
     case R_CAPABILITIES:
         error_report("milkymist_sysctl: write to read-only register 0x"
                 TARGET_FMT_plx, addr << 2);
         break;

     default:
         error_report("milkymist_sysctl: write access to unkown register 0x"
                 TARGET_FMT_plx, addr << 2);
         break;
     }
 }

 static CPUReadMemoryFunc * const sysctl_read_fn[] = {
     NULL,
     NULL,
     &sysctl_read,
 };

 static CPUWriteMemoryFunc * const sysctl_write_fn[] = {
     NULL,
     NULL,
     &sysctl_write,
 };

 static void timer0_hit(void *opaque)
 {
     MilkymistSysctlState *s = opaque;

     if (!(s->regs[R_TIMER0_CONTROL] & CTRL_AUTORESTART)) {
         s->regs[R_TIMER0_CONTROL] &= ~CTRL_ENABLE;
         trace_milkymist_sysctl_stop_timer0();
         ptimer_stop(s->ptimer0);
     }

     trace_milkymist_sysctl_pulse_irq_timer0();
     qemu_irq_pulse(s->timer0_irq);
 }

 static void timer1_hit(void *opaque)
 {
     MilkymistSysctlState *s = opaque;

     if (!(s->regs[R_TIMER1_CONTROL] & CTRL_AUTORESTART)) {
         s->regs[R_TIMER1_CONTROL] &= ~CTRL_ENABLE;
         trace_milkymist_sysctl_stop_timer1();
         ptimer_stop(s->ptimer1);
     }

     trace_milkymist_sysctl_pulse_irq_timer1();
     qemu_irq_pulse(s->timer1_irq);
 }

 static void milkymist_sysctl_reset(DeviceState *d)
 {
     MilkymistSysctlState *s =
             container_of(d, MilkymistSysctlState, busdev.qdev);
     int i;

     for (i = 0; i < R_MAX; i++) {
         s->regs[i] = 0;
     }

     ptimer_stop(s->ptimer0);
     ptimer_stop(s->ptimer1);

     /* defaults */
     s->regs[R_ICAP] = ICAP_READY;
     s->regs[R_SYSTEM_ID] = s->systemid;
     s->regs[R_CAPABILITIES] = s->capabilities;
     s->regs[R_GPIO_IN] = s->strappings;
 }

 static int milkymist_sysctl_init(SysBusDevice *dev)
 {
     MilkymistSysctlState *s = FROM_SYSBUS(typeof(*s), dev);
     int sysctl_regs;

     sysbus_init_irq(dev, &s->gpio_irq);
     sysbus_init_irq(dev, &s->timer0_irq);
     sysbus_init_irq(dev, &s->timer1_irq);

     s->bh0 = qemu_bh_new(timer0_hit, s);
     s->bh1 = qemu_bh_new(timer1_hit, s);
     s->ptimer0 = ptimer_init(s->bh0);
     s->ptimer1 = ptimer_init(s->bh1);
     ptimer_set_freq(s->ptimer0, s->freq_hz);
     ptimer_set_freq(s->ptimer1, s->freq_hz);

     sysctl_regs = cpu_register_io_memory(sysctl_read_fn, sysctl_write_fn, s,
             DEVICE_NATIVE_ENDIAN);
     sysbus_init_mmio(dev, R_MAX * 4, sysctl_regs);

     return 0;
 }

 static const VMStateDescription vmstate_milkymist_sysctl = {
     .name = "milkymist-sysctl",
     .version_id = 1,
     .minimum_version_id = 1,
     .minimum_version_id_old = 1,
     .fields      = (VMStateField[]) {
         VMSTATE_UINT32_ARRAY(regs, MilkymistSysctlState, R_MAX),
         VMSTATE_PTIMER(ptimer0, MilkymistSysctlState),
         VMSTATE_PTIMER(ptimer1, MilkymistSysctlState),
         VMSTATE_END_OF_LIST()
     }
 };

 static SysBusDeviceInfo milkymist_sysctl_info = {
     .init = milkymist_sysctl_init,
     .qdev.name  = "milkymist-sysctl",
     .qdev.size  = sizeof(MilkymistSysctlState),
     .qdev.vmsd  = &vmstate_milkymist_sysctl,
     .qdev.reset = milkymist_sysctl_reset,
     .qdev.props = (Property[]) {
         DEFINE_PROP_UINT32("frequency", MilkymistSysctlState,
                 freq_hz, 80000000),
         DEFINE_PROP_UINT32("capabilities", MilkymistSysctlState,
                 capabilities, 0x00000000),
         DEFINE_PROP_UINT32("systemid", MilkymistSysctlState,
                 systemid, 0x10014d31),
         DEFINE_PROP_UINT32("gpio_strappings", MilkymistSysctlState,
                 strappings, 0x00000001),
         DEFINE_PROP_END_OF_LIST(),
     }
 };

 static void milkymist_sysctl_register(void)
 {
     sysbus_register_withprop(&milkymist_sysctl_info);
 }

 device_init(milkymist_sysctl_register)
	/*
	* QEMU model of the Milkymist System Controller.
	*
	* Copyright (c) 2010 Michael Walle <michael@walle.cc>
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with this library; if not, see <http://www.gnu.org/licenses/>.
	*
	*
	* Specification available at:
	* http://www.milkymist.org/socdoc/sysctl.pdf
	*/

	#include "hw.h"
	#include "sysbus.h"
	#include "sysemu.h"
	#include "trace.h"
	#include "qemu-timer.h"
	#include "qemu-error.h"

	enum {
	CTRL_ENABLE = (1<<0),
	CTRL_AUTORESTART = (1<<1),
	};

	enum {
	ICAP_READY = (1<<0),
	};

	enum {
	R_GPIO_IN = 0,
	R_GPIO_OUT,
	R_GPIO_INTEN,
	R_RESERVED0,
	R_TIMER0_CONTROL,
	R_TIMER0_COMPARE,
	R_TIMER0_COUNTER,
	R_RESERVED1,
	R_TIMER1_CONTROL,
	R_TIMER1_COMPARE,
	R_TIMER1_COUNTER,
	R_RESERVED2,
	R_RESERVED3,
	R_ICAP,
	R_CAPABILITIES,
	R_SYSTEM_ID,
	R_MAX
	};

	struct MilkymistSysctlState {
	SysBusDevice busdev;

	QEMUBH *bh0;
	QEMUBH *bh1;
	ptimer_state *ptimer0;
	ptimer_state *ptimer1;

	uint32_t freq_hz;
	uint32_t capabilities;
	uint32_t systemid;
	uint32_t strappings;

	uint32_t regs[R_MAX];

	qemu_irq gpio_irq;
	qemu_irq timer0_irq;
	qemu_irq timer1_irq;
	};
	typedef struct MilkymistSysctlState MilkymistSysctlState;

	static void sysctl_icap_write(MilkymistSysctlState *s, uint32_t value)
	{
	trace_milkymist_sysctl_icap_write(value);
	switch (value & 0xffff) {
	case 0x000e:
	qemu_system_shutdown_request();
	break;
	}
	}

	static uint32_t sysctl_read(void *opaque, target_phys_addr_t addr)
	{
	MilkymistSysctlState *s = opaque;
	uint32_t r = 0;

	addr >>= 2;
	switch (addr) {
	case R_TIMER0_COUNTER:
	r = (uint32_t)ptimer_get_count(s->ptimer0);
	/* milkymist timer counts up */
	r = s->regs[R_TIMER0_COMPARE] - r;
	break;
	case R_TIMER1_COUNTER:
	r = (uint32_t)ptimer_get_count(s->ptimer1);
	/* milkymist timer counts up */
	r = s->regs[R_TIMER1_COMPARE] - r;
	break;
	case R_GPIO_IN:
	case R_GPIO_OUT:
	case R_GPIO_INTEN:
	case R_TIMER0_CONTROL:
	case R_TIMER0_COMPARE:
	case R_TIMER1_CONTROL:
	case R_TIMER1_COMPARE:
	case R_ICAP:
	case R_CAPABILITIES:
	case R_SYSTEM_ID:
	r = s->regs[addr];
	break;

	default:
	error_report("milkymist_sysctl: read access to unkown register 0x"
	TARGET_FMT_plx, addr << 2);
	break;
	}

	trace_milkymist_sysctl_memory_read(addr << 2, r);

	return r;
	}

	static void sysctl_write(void *opaque, target_phys_addr_t addr, uint32_t value)
	{
	MilkymistSysctlState *s = opaque;

	trace_milkymist_sysctl_memory_write(addr, value);

	addr >>= 2;
	switch (addr) {
	case R_GPIO_OUT:
	case R_GPIO_INTEN:
	case R_TIMER0_COUNTER:
	case R_TIMER1_COUNTER:
	s->regs[addr] = value;
	break;
	case R_TIMER0_COMPARE:
	ptimer_set_limit(s->ptimer0, value, 0);
	s->regs[addr] = value;
	break;
	case R_TIMER1_COMPARE:
	ptimer_set_limit(s->ptimer1, value, 0);
	s->regs[addr] = value;
	break;
	case R_TIMER0_CONTROL:
	s->regs[addr] = value;
	if (s->regs[R_TIMER0_CONTROL] & CTRL_ENABLE) {
	trace_milkymist_sysctl_start_timer0();
	ptimer_set_count(s->ptimer0,
	s->regs[R_TIMER0_COMPARE] - s->regs[R_TIMER0_COUNTER]);
	ptimer_run(s->ptimer0, 0);
	} else {
	trace_milkymist_sysctl_stop_timer0();
	ptimer_stop(s->ptimer0);
	}
	break;
	case R_TIMER1_CONTROL:
	s->regs[addr] = value;
	if (s->regs[R_TIMER1_CONTROL] & CTRL_ENABLE) {
	trace_milkymist_sysctl_start_timer1();
	ptimer_set_count(s->ptimer1,
	s->regs[R_TIMER1_COMPARE] - s->regs[R_TIMER1_COUNTER]);
	ptimer_run(s->ptimer1, 0);
	} else {
	trace_milkymist_sysctl_stop_timer1();
	ptimer_stop(s->ptimer1);
	}
	break;
	case R_ICAP:
	sysctl_icap_write(s, value);
	break;
	case R_SYSTEM_ID:
	qemu_system_reset_request();
	break;

	case R_GPIO_IN:
	case R_CAPABILITIES:
	error_report("milkymist_sysctl: write to read-only register 0x"
	TARGET_FMT_plx, addr << 2);
	break;

	default:
	error_report("milkymist_sysctl: write access to unkown register 0x"
	TARGET_FMT_plx, addr << 2);
	break;
	}
	}

	static CPUReadMemoryFunc * const sysctl_read_fn[] = {
	NULL,
	NULL,
	&sysctl_read,
	};

	static CPUWriteMemoryFunc * const sysctl_write_fn[] = {
	NULL,
	NULL,
	&sysctl_write,
	};

	static void timer0_hit(void *opaque)
	{
	MilkymistSysctlState *s = opaque;

	if (!(s->regs[R_TIMER0_CONTROL] & CTRL_AUTORESTART)) {
	s->regs[R_TIMER0_CONTROL] &= ~CTRL_ENABLE;
	trace_milkymist_sysctl_stop_timer0();
	ptimer_stop(s->ptimer0);
	}

	trace_milkymist_sysctl_pulse_irq_timer0();
	qemu_irq_pulse(s->timer0_irq);
	}

	static void timer1_hit(void *opaque)
	{
	MilkymistSysctlState *s = opaque;

	if (!(s->regs[R_TIMER1_CONTROL] & CTRL_AUTORESTART)) {
	s->regs[R_TIMER1_CONTROL] &= ~CTRL_ENABLE;
	trace_milkymist_sysctl_stop_timer1();
	ptimer_stop(s->ptimer1);
	}

	trace_milkymist_sysctl_pulse_irq_timer1();
	qemu_irq_pulse(s->timer1_irq);
	}

	static void milkymist_sysctl_reset(DeviceState *d)
	{
	MilkymistSysctlState *s =
	container_of(d, MilkymistSysctlState, busdev.qdev);
	int i;

	for (i = 0; i < R_MAX; i++) {
	s->regs[i] = 0;
	}

	ptimer_stop(s->ptimer0);
	ptimer_stop(s->ptimer1);

	/* defaults */
	s->regs[R_ICAP] = ICAP_READY;
	s->regs[R_SYSTEM_ID] = s->systemid;
	s->regs[R_CAPABILITIES] = s->capabilities;
	s->regs[R_GPIO_IN] = s->strappings;
	}

	static int milkymist_sysctl_init(SysBusDevice *dev)
	{
	MilkymistSysctlState s = FROM_SYSBUS(typeof(s), dev);
	int sysctl_regs;

	sysbus_init_irq(dev, &s->gpio_irq);
	sysbus_init_irq(dev, &s->timer0_irq);
	sysbus_init_irq(dev, &s->timer1_irq);

	s->bh0 = qemu_bh_new(timer0_hit, s);
	s->bh1 = qemu_bh_new(timer1_hit, s);
	s->ptimer0 = ptimer_init(s->bh0);
	s->ptimer1 = ptimer_init(s->bh1);
	ptimer_set_freq(s->ptimer0, s->freq_hz);
	ptimer_set_freq(s->ptimer1, s->freq_hz);

	sysctl_regs = cpu_register_io_memory(sysctl_read_fn, sysctl_write_fn, s,
	DEVICE_NATIVE_ENDIAN);
	sysbus_init_mmio(dev, R_MAX * 4, sysctl_regs);

	return 0;
	}

	static const VMStateDescription vmstate_milkymist_sysctl = {
	.name = "milkymist-sysctl",
	.version_id = 1,
	.minimum_version_id = 1,
	.minimum_version_id_old = 1,
	.fields = (VMStateField[]) {
	VMSTATE_UINT32_ARRAY(regs, MilkymistSysctlState, R_MAX),
	VMSTATE_PTIMER(ptimer0, MilkymistSysctlState),
	VMSTATE_PTIMER(ptimer1, MilkymistSysctlState),
	VMSTATE_END_OF_LIST()
	}
	};

	static SysBusDeviceInfo milkymist_sysctl_info = {
	.init = milkymist_sysctl_init,
	.qdev.name = "milkymist-sysctl",
	.qdev.size = sizeof(MilkymistSysctlState),
	.qdev.vmsd = &vmstate_milkymist_sysctl,
	.qdev.reset = milkymist_sysctl_reset,
	.qdev.props = (Property[]) {
	DEFINE_PROP_UINT32("frequency", MilkymistSysctlState,
	freq_hz, 80000000),
	DEFINE_PROP_UINT32("capabilities", MilkymistSysctlState,
	capabilities, 0x00000000),
	DEFINE_PROP_UINT32("systemid", MilkymistSysctlState,
	systemid, 0x10014d31),
	DEFINE_PROP_UINT32("gpio_strappings", MilkymistSysctlState,
	strappings, 0x00000001),
	DEFINE_PROP_END_OF_LIST(),
	}
	};

	static void milkymist_sysctl_register(void)
	{
	sysbus_register_withprop(&milkymist_sysctl_info);
	}

	device_init(milkymist_sysctl_register)