hw/gpio/imx_gpio.c - qemu - Git at Google

 /*
  * i.MX processors GPIO emulation.
  *
  * Copyright (C) 2015 Jean-Christophe Dubois <jcd@tribudubois.net>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation; either version 2 or
  * (at your option) version 3 of the License.
  *
  * This program 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 General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License along
  * with this program; if not, see <http://www.gnu.org/licenses/>.
  */

 #include "hw/gpio/imx_gpio.h"

 #ifndef DEBUG_IMX_GPIO
 #define DEBUG_IMX_GPIO 0
 #endif

 typedef enum IMXGPIOLevel {
     IMX_GPIO_LEVEL_LOW = 0,
     IMX_GPIO_LEVEL_HIGH = 1,
 } IMXGPIOLevel;

 #define DPRINTF(fmt, args...) \
     do { \
         if (DEBUG_IMX_GPIO) { \
             fprintf(stderr, "[%s]%s: " fmt , TYPE_IMX_GPIO, \
                                              __func__, ##args); \
         } \
     } while (0)

 static const char *imx_gpio_reg_name(uint32_t reg)
 {
     switch (reg) {
     case DR_ADDR:
         return "DR";
     case GDIR_ADDR:
         return "GDIR";
     case PSR_ADDR:
         return "PSR";
     case ICR1_ADDR:
         return "ICR1";
     case ICR2_ADDR:
         return "ICR2";
     case IMR_ADDR:
         return "IMR";
     case ISR_ADDR:
         return "ISR";
     case EDGE_SEL_ADDR:
         return "EDGE_SEL";
     default:
         return "[?]";
     }
 }

 static void imx_gpio_update_int(IMXGPIOState *s)
 {
     qemu_set_irq(s->irq, (s->isr & s->imr) ? 1 : 0);
 }

 static void imx_gpio_set_int_line(IMXGPIOState *s, int line, IMXGPIOLevel level)
 {
     /* if this signal isn't configured as an input signal, nothing to do */
     if (!extract32(s->gdir, line, 1)) {
         return;
     }

     /* When set, EDGE_SEL overrides the ICR config */
     if (extract32(s->edge_sel, line, 1)) {
         /* we detect interrupt on rising and falling edge */
         if (extract32(s->psr, line, 1) != level) {
             /* level changed */
             s->isr = deposit32(s->isr, line, 1, 1);
         }
     } else if (extract64(s->icr, 2*line + 1, 1)) {
         /* interrupt is edge sensitive */
         if (extract32(s->psr, line, 1) != level) {
             /* level changed */
             if (extract64(s->icr, 2*line, 1) != level) {
                 s->isr = deposit32(s->isr, line, 1, 1);
             }
         }
     } else {
         /* interrupt is level sensitive */
         if (extract64(s->icr, 2*line, 1) == level) {
             s->isr = deposit32(s->isr, line, 1, 1);
         }
     }
 }

 static void imx_gpio_set(void *opaque, int line, int level)
 {
     IMXGPIOState *s = IMX_GPIO(opaque);
     IMXGPIOLevel imx_level = level ? IMX_GPIO_LEVEL_HIGH : IMX_GPIO_LEVEL_LOW;

     imx_gpio_set_int_line(s, line, imx_level);

     /* this is an input signal, so set PSR */
     s->psr = deposit32(s->psr, line, 1, imx_level);

     imx_gpio_update_int(s);
 }

 static void imx_gpio_set_all_int_lines(IMXGPIOState *s)
 {
     int i;

     for (i = 0; i < IMX_GPIO_PIN_COUNT; i++) {
         IMXGPIOLevel imx_level = extract32(s->psr, i, 1);
         imx_gpio_set_int_line(s, i, imx_level);
     }

     imx_gpio_update_int(s);
 }

 static inline void imx_gpio_set_all_output_lines(IMXGPIOState *s)
 {
     int i;

     for (i = 0; i < IMX_GPIO_PIN_COUNT; i++) {
         /*
          * if the line is set as output, then forward the line
          * level to its user.
          */
         if (extract32(s->gdir, i, 1) && s->output[i]) {
             qemu_set_irq(s->output[i], extract32(s->dr, i, 1));
         }
     }
 }

 static uint64_t imx_gpio_read(void *opaque, hwaddr offset, unsigned size)
 {
     IMXGPIOState *s = IMX_GPIO(opaque);
     uint32_t reg_value = 0;

     switch (offset) {
     case DR_ADDR:
         /*
          * depending on the "line" configuration, the bit values
          * are coming either from DR or PSR
          */
         reg_value = (s->dr & s->gdir) | (s->psr & ~s->gdir);
         break;

     case GDIR_ADDR:
         reg_value = s->gdir;
         break;

     case PSR_ADDR:
         reg_value = s->psr & ~s->gdir;
         break;

     case ICR1_ADDR:
         reg_value = extract64(s->icr, 0, 32);
         break;

     case ICR2_ADDR:
         reg_value = extract64(s->icr, 32, 32);
         break;

     case IMR_ADDR:
         reg_value = s->imr;
         break;

     case ISR_ADDR:
         reg_value = s->isr;
         break;

     case EDGE_SEL_ADDR:
         if (s->has_edge_sel) {
             reg_value = s->edge_sel;
         } else {
             qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: EDGE_SEL register not "
                           "present on this version of GPIO device\n",
                           TYPE_IMX_GPIO, __func__);
         }
         break;

     default:
         qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Bad register at offset 0x%"
                       HWADDR_PRIx "\n", TYPE_IMX_GPIO, __func__, offset);
         break;
     }

     DPRINTF("(%s) = 0x%" PRIx32 "\n", imx_gpio_reg_name(offset), reg_value);

     return reg_value;
 }

 static void imx_gpio_write(void *opaque, hwaddr offset, uint64_t value,
                            unsigned size)
 {
     IMXGPIOState *s = IMX_GPIO(opaque);

     DPRINTF("(%s, value = 0x%" PRIx32 ")\n", imx_gpio_reg_name(offset),
             (uint32_t)value);

     switch (offset) {
     case DR_ADDR:
         s->dr = value;
         imx_gpio_set_all_output_lines(s);
         break;

     case GDIR_ADDR:
         s->gdir = value;
         imx_gpio_set_all_output_lines(s);
         imx_gpio_set_all_int_lines(s);
         break;

     case ICR1_ADDR:
         s->icr = deposit64(s->icr, 0, 32, value);
         imx_gpio_set_all_int_lines(s);
         break;

     case ICR2_ADDR:
         s->icr = deposit64(s->icr, 32, 32, value);
         imx_gpio_set_all_int_lines(s);
         break;

     case IMR_ADDR:
         s->imr = value;
         imx_gpio_update_int(s);
         break;

     case ISR_ADDR:
         s->isr |= ~value;
         imx_gpio_set_all_int_lines(s);
         break;

     case EDGE_SEL_ADDR:
         if (s->has_edge_sel) {
             s->edge_sel = value;
             imx_gpio_set_all_int_lines(s);
         } else {
             qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: EDGE_SEL register not "
                           "present on this version of GPIO device\n",
                           TYPE_IMX_GPIO, __func__);
         }
         break;

     default:
         qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Bad register at offset 0x%"
                       HWADDR_PRIx "\n", TYPE_IMX_GPIO, __func__, offset);
         break;
     }

     return;
 }

 static const MemoryRegionOps imx_gpio_ops = {
     .read = imx_gpio_read,
     .write = imx_gpio_write,
     .valid.min_access_size = 4,
     .valid.max_access_size = 4,
     .endianness = DEVICE_NATIVE_ENDIAN,
 };

 static const VMStateDescription vmstate_imx_gpio = {
     .name = TYPE_IMX_GPIO,
     .version_id = 1,
     .minimum_version_id = 1,
     .minimum_version_id_old = 1,
     .fields = (VMStateField[]) {
         VMSTATE_UINT32(dr, IMXGPIOState),
         VMSTATE_UINT32(gdir, IMXGPIOState),
         VMSTATE_UINT32(psr, IMXGPIOState),
         VMSTATE_UINT64(icr, IMXGPIOState),
         VMSTATE_UINT32(imr, IMXGPIOState),
         VMSTATE_UINT32(isr, IMXGPIOState),
         VMSTATE_BOOL(has_edge_sel, IMXGPIOState),
         VMSTATE_UINT32(edge_sel, IMXGPIOState),
         VMSTATE_END_OF_LIST()
     }
 };

 static Property imx_gpio_properties[] = {
     DEFINE_PROP_BOOL("has-edge-sel", IMXGPIOState, has_edge_sel, true),
     DEFINE_PROP_END_OF_LIST(),
 };

 static void imx_gpio_reset(DeviceState *dev)
 {
     IMXGPIOState *s = IMX_GPIO(dev);

     s->dr       = 0;
     s->gdir     = 0;
     s->psr      = 0;
     s->icr      = 0;
     s->imr      = 0;
     s->isr      = 0;
     s->edge_sel = 0;

     imx_gpio_set_all_output_lines(s);
     imx_gpio_update_int(s);
 }

 static void imx_gpio_realize(DeviceState *dev, Error **errp)
 {
     IMXGPIOState *s = IMX_GPIO(dev);

     memory_region_init_io(&s->iomem, OBJECT(s), &imx_gpio_ops, s,
                           TYPE_IMX_GPIO, IMX_GPIO_MEM_SIZE);

     qdev_init_gpio_in(DEVICE(s), imx_gpio_set, IMX_GPIO_PIN_COUNT);
     qdev_init_gpio_out(DEVICE(s), s->output, IMX_GPIO_PIN_COUNT);

     sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->irq);
     sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->iomem);
 }

 static void imx_gpio_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);

     dc->realize = imx_gpio_realize;
     dc->reset = imx_gpio_reset;
     dc->props = imx_gpio_properties;
     dc->vmsd = &vmstate_imx_gpio;
     dc->desc = "i.MX GPIO controller";
 }

 static const TypeInfo imx_gpio_info = {
     .name = TYPE_IMX_GPIO,
     .parent = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(IMXGPIOState),
     .class_init = imx_gpio_class_init,
 };

 static void imx_gpio_register_types(void)
 {
     type_register_static(&imx_gpio_info);
 }

 type_init(imx_gpio_register_types)
	/*
	* i.MX processors GPIO emulation.
	*
	* Copyright (C) 2015 Jean-Christophe Dubois <jcd@tribudubois.net>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation; either version 2 or
	* (at your option) version 3 of the License.
	*
	* This program 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 General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License along
	* with this program; if not, see <http://www.gnu.org/licenses/>.
	*/

	#include "hw/gpio/imx_gpio.h"

	#ifndef DEBUG_IMX_GPIO
	#define DEBUG_IMX_GPIO 0
	#endif

	typedef enum IMXGPIOLevel {
	IMX_GPIO_LEVEL_LOW = 0,
	IMX_GPIO_LEVEL_HIGH = 1,
	} IMXGPIOLevel;

	#define DPRINTF(fmt, args...) \
	do { \
	if (DEBUG_IMX_GPIO) { \
	fprintf(stderr, "[%s]%s: " fmt , TYPE_IMX_GPIO, \
	__func__, ##args); \
	} \
	} while (0)

	static const char *imx_gpio_reg_name(uint32_t reg)
	{
	switch (reg) {
	case DR_ADDR:
	return "DR";
	case GDIR_ADDR:
	return "GDIR";
	case PSR_ADDR:
	return "PSR";
	case ICR1_ADDR:
	return "ICR1";
	case ICR2_ADDR:
	return "ICR2";
	case IMR_ADDR:
	return "IMR";
	case ISR_ADDR:
	return "ISR";
	case EDGE_SEL_ADDR:
	return "EDGE_SEL";
	default:
	return "[?]";
	}
	}

	static void imx_gpio_update_int(IMXGPIOState *s)
	{
	qemu_set_irq(s->irq, (s->isr & s->imr) ? 1 : 0);
	}

	static void imx_gpio_set_int_line(IMXGPIOState *s, int line, IMXGPIOLevel level)
	{
	/* if this signal isn't configured as an input signal, nothing to do */
	if (!extract32(s->gdir, line, 1)) {
	return;
	}

	/* When set, EDGE_SEL overrides the ICR config */
	if (extract32(s->edge_sel, line, 1)) {
	/* we detect interrupt on rising and falling edge */
	if (extract32(s->psr, line, 1) != level) {
	/* level changed */
	s->isr = deposit32(s->isr, line, 1, 1);
	}
	} else if (extract64(s->icr, 2*line + 1, 1)) {
	/* interrupt is edge sensitive */
	if (extract32(s->psr, line, 1) != level) {
	/* level changed */
	if (extract64(s->icr, 2*line, 1) != level) {
	s->isr = deposit32(s->isr, line, 1, 1);
	}
	}
	} else {
	/* interrupt is level sensitive */
	if (extract64(s->icr, 2*line, 1) == level) {
	s->isr = deposit32(s->isr, line, 1, 1);
	}
	}
	}

	static void imx_gpio_set(void *opaque, int line, int level)
	{
	IMXGPIOState *s = IMX_GPIO(opaque);
	IMXGPIOLevel imx_level = level ? IMX_GPIO_LEVEL_HIGH : IMX_GPIO_LEVEL_LOW;

	imx_gpio_set_int_line(s, line, imx_level);

	/* this is an input signal, so set PSR */
	s->psr = deposit32(s->psr, line, 1, imx_level);

	imx_gpio_update_int(s);
	}

	static void imx_gpio_set_all_int_lines(IMXGPIOState *s)
	{
	int i;

	for (i = 0; i < IMX_GPIO_PIN_COUNT; i++) {
	IMXGPIOLevel imx_level = extract32(s->psr, i, 1);
	imx_gpio_set_int_line(s, i, imx_level);
	}

	imx_gpio_update_int(s);
	}

	static inline void imx_gpio_set_all_output_lines(IMXGPIOState *s)
	{
	int i;

	for (i = 0; i < IMX_GPIO_PIN_COUNT; i++) {
	/*
	* if the line is set as output, then forward the line
	* level to its user.
	*/
	if (extract32(s->gdir, i, 1) && s->output[i]) {
	qemu_set_irq(s->output[i], extract32(s->dr, i, 1));
	}
	}
	}

	static uint64_t imx_gpio_read(void *opaque, hwaddr offset, unsigned size)
	{
	IMXGPIOState *s = IMX_GPIO(opaque);
	uint32_t reg_value = 0;

	switch (offset) {
	case DR_ADDR:
	/*
	* depending on the "line" configuration, the bit values
	* are coming either from DR or PSR
	*/
	reg_value = (s->dr & s->gdir) \| (s->psr & ~s->gdir);
	break;

	case GDIR_ADDR:
	reg_value = s->gdir;
	break;

	case PSR_ADDR:
	reg_value = s->psr & ~s->gdir;
	break;

	case ICR1_ADDR:
	reg_value = extract64(s->icr, 0, 32);
	break;

	case ICR2_ADDR:
	reg_value = extract64(s->icr, 32, 32);
	break;

	case IMR_ADDR:
	reg_value = s->imr;
	break;

	case ISR_ADDR:
	reg_value = s->isr;
	break;

	case EDGE_SEL_ADDR:
	if (s->has_edge_sel) {
	reg_value = s->edge_sel;
	} else {
	qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: EDGE_SEL register not "
	"present on this version of GPIO device\n",
	TYPE_IMX_GPIO, __func__);
	}
	break;

	default:
	qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Bad register at offset 0x%"
	HWADDR_PRIx "\n", TYPE_IMX_GPIO, __func__, offset);
	break;
	}

	DPRINTF("(%s) = 0x%" PRIx32 "\n", imx_gpio_reg_name(offset), reg_value);

	return reg_value;
	}

	static void imx_gpio_write(void *opaque, hwaddr offset, uint64_t value,
	unsigned size)
	{
	IMXGPIOState *s = IMX_GPIO(opaque);

	DPRINTF("(%s, value = 0x%" PRIx32 ")\n", imx_gpio_reg_name(offset),
	(uint32_t)value);

	switch (offset) {
	case DR_ADDR:
	s->dr = value;
	imx_gpio_set_all_output_lines(s);
	break;

	case GDIR_ADDR:
	s->gdir = value;
	imx_gpio_set_all_output_lines(s);
	imx_gpio_set_all_int_lines(s);
	break;

	case ICR1_ADDR:
	s->icr = deposit64(s->icr, 0, 32, value);
	imx_gpio_set_all_int_lines(s);
	break;

	case ICR2_ADDR:
	s->icr = deposit64(s->icr, 32, 32, value);
	imx_gpio_set_all_int_lines(s);
	break;

	case IMR_ADDR:
	s->imr = value;
	imx_gpio_update_int(s);
	break;

	case ISR_ADDR:
	s->isr \|= ~value;
	imx_gpio_set_all_int_lines(s);
	break;

	case EDGE_SEL_ADDR:
	if (s->has_edge_sel) {
	s->edge_sel = value;
	imx_gpio_set_all_int_lines(s);
	} else {
	qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: EDGE_SEL register not "
	"present on this version of GPIO device\n",
	TYPE_IMX_GPIO, __func__);
	}
	break;

	default:
	qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Bad register at offset 0x%"
	HWADDR_PRIx "\n", TYPE_IMX_GPIO, __func__, offset);
	break;
	}

	return;
	}

	static const MemoryRegionOps imx_gpio_ops = {
	.read = imx_gpio_read,
	.write = imx_gpio_write,
	.valid.min_access_size = 4,
	.valid.max_access_size = 4,
	.endianness = DEVICE_NATIVE_ENDIAN,
	};

	static const VMStateDescription vmstate_imx_gpio = {
	.name = TYPE_IMX_GPIO,
	.version_id = 1,
	.minimum_version_id = 1,
	.minimum_version_id_old = 1,
	.fields = (VMStateField[]) {
	VMSTATE_UINT32(dr, IMXGPIOState),
	VMSTATE_UINT32(gdir, IMXGPIOState),
	VMSTATE_UINT32(psr, IMXGPIOState),
	VMSTATE_UINT64(icr, IMXGPIOState),
	VMSTATE_UINT32(imr, IMXGPIOState),
	VMSTATE_UINT32(isr, IMXGPIOState),
	VMSTATE_BOOL(has_edge_sel, IMXGPIOState),
	VMSTATE_UINT32(edge_sel, IMXGPIOState),
	VMSTATE_END_OF_LIST()
	}
	};

	static Property imx_gpio_properties[] = {
	DEFINE_PROP_BOOL("has-edge-sel", IMXGPIOState, has_edge_sel, true),
	DEFINE_PROP_END_OF_LIST(),
	};

	static void imx_gpio_reset(DeviceState *dev)
	{
	IMXGPIOState *s = IMX_GPIO(dev);

	s->dr = 0;
	s->gdir = 0;
	s->psr = 0;
	s->icr = 0;
	s->imr = 0;
	s->isr = 0;
	s->edge_sel = 0;

	imx_gpio_set_all_output_lines(s);
	imx_gpio_update_int(s);
	}

	static void imx_gpio_realize(DeviceState dev, Error *errp)
	{
	IMXGPIOState *s = IMX_GPIO(dev);

	memory_region_init_io(&s->iomem, OBJECT(s), &imx_gpio_ops, s,
	TYPE_IMX_GPIO, IMX_GPIO_MEM_SIZE);

	qdev_init_gpio_in(DEVICE(s), imx_gpio_set, IMX_GPIO_PIN_COUNT);
	qdev_init_gpio_out(DEVICE(s), s->output, IMX_GPIO_PIN_COUNT);

	sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->irq);
	sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->iomem);
	}

	static void imx_gpio_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);

	dc->realize = imx_gpio_realize;
	dc->reset = imx_gpio_reset;
	dc->props = imx_gpio_properties;
	dc->vmsd = &vmstate_imx_gpio;
	dc->desc = "i.MX GPIO controller";
	}

	static const TypeInfo imx_gpio_info = {
	.name = TYPE_IMX_GPIO,
	.parent = TYPE_SYS_BUS_DEVICE,
	.instance_size = sizeof(IMXGPIOState),
	.class_init = imx_gpio_class_init,
	};

	static void imx_gpio_register_types(void)
	{
	type_register_static(&imx_gpio_info);
	}

	type_init(imx_gpio_register_types)