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qemu/hw/gpio/imx_gpio.c

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/*
* 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 "qemu/osdep.h"
#include "hw/gpio/imx_gpio.h"
#include "qemu/log.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)
{
if (s->has_upper_pin_irq) {
qemu_set_irq(s->irq[0], (s->isr & s->imr & 0x0000FFFF) ? 1 : 0);
qemu_set_irq(s->irq[1], (s->isr & s->imr & 0xFFFF0000) ? 1 : 0);
} else {
qemu_set_irq(s->irq[0], (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_BOOL("has-upper-pin-irq", IMXGPIOState, has_upper_pin_irq,
false),
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[0]);
sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->irq[1]);
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)
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