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qemu/hw/gpio/bcm2835_gpio.c
Clement Deschamps d72fc9dcb1 bcm2835_gpio: add bcm2835 gpio controller 
This adds the BCM2835 GPIO controller.

It currently implements:
- The 54 GPIOs as outputs (qemu_irq)
- The SD controller selection via alternate function of GPIOs 48-53

Signed-off-by: Clement Deschamps <clement.deschamps@antfield.fr>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1488293711-14195-4-git-send-email-peter.maydell@linaro.org
Message-id: 20170224164021.9066-4-clement.deschamps@antfield.fr
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2017-02-28 17:10:00 +00:00

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8.4 KiB
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/*
* Raspberry Pi (BCM2835) GPIO Controller
*
* Copyright (c) 2017 Antfield SAS
*
* Authors:
* Clement Deschamps <clement.deschamps@antfield.fr>
* Luc Michel <luc.michel@antfield.fr>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "qemu/timer.h"
#include "qapi/error.h"
#include "hw/sysbus.h"
#include "hw/sd/sd.h"
#include "hw/gpio/bcm2835_gpio.h"
#define GPFSEL0 0x00
#define GPFSEL1 0x04
#define GPFSEL2 0x08
#define GPFSEL3 0x0C
#define GPFSEL4 0x10
#define GPFSEL5 0x14
#define GPSET0 0x1C
#define GPSET1 0x20
#define GPCLR0 0x28
#define GPCLR1 0x2C
#define GPLEV0 0x34
#define GPLEV1 0x38
#define GPEDS0 0x40
#define GPEDS1 0x44
#define GPREN0 0x4C
#define GPREN1 0x50
#define GPFEN0 0x58
#define GPFEN1 0x5C
#define GPHEN0 0x64
#define GPHEN1 0x68
#define GPLEN0 0x70
#define GPLEN1 0x74
#define GPAREN0 0x7C
#define GPAREN1 0x80
#define GPAFEN0 0x88
#define GPAFEN1 0x8C
#define GPPUD 0x94
#define GPPUDCLK0 0x98
#define GPPUDCLK1 0x9C
static uint32_t gpfsel_get(BCM2835GpioState *s, uint8_t reg)
{
int i;
uint32_t value = 0;
for (i = 0; i < 10; i++) {
uint32_t index = 10 * reg + i;
if (index < sizeof(s->fsel)) {
value |= (s->fsel[index] & 0x7) << (3 * i);
}
}
return value;
}
static void gpfsel_set(BCM2835GpioState *s, uint8_t reg, uint32_t value)
{
int i;
for (i = 0; i < 10; i++) {
uint32_t index = 10 * reg + i;
if (index < sizeof(s->fsel)) {
int fsel = (value >> (3 * i)) & 0x7;
s->fsel[index] = fsel;
}
}
/* SD controller selection (48-53) */
if (s->sd_fsel != 0
&& (s->fsel[48] == 0) /* SD_CLK_R */
&& (s->fsel[49] == 0) /* SD_CMD_R */
&& (s->fsel[50] == 0) /* SD_DATA0_R */
&& (s->fsel[51] == 0) /* SD_DATA1_R */
&& (s->fsel[52] == 0) /* SD_DATA2_R */
&& (s->fsel[53] == 0) /* SD_DATA3_R */
) {
/* SDHCI controller selected */
sdbus_reparent_card(s->sdbus_sdhost, s->sdbus_sdhci);
s->sd_fsel = 0;
} else if (s->sd_fsel != 4
&& (s->fsel[48] == 4) /* SD_CLK_R */
&& (s->fsel[49] == 4) /* SD_CMD_R */
&& (s->fsel[50] == 4) /* SD_DATA0_R */
&& (s->fsel[51] == 4) /* SD_DATA1_R */
&& (s->fsel[52] == 4) /* SD_DATA2_R */
&& (s->fsel[53] == 4) /* SD_DATA3_R */
) {
/* SDHost controller selected */
sdbus_reparent_card(s->sdbus_sdhci, s->sdbus_sdhost);
s->sd_fsel = 4;
}
}
static int gpfsel_is_out(BCM2835GpioState *s, int index)
{
if (index >= 0 && index < 54) {
return s->fsel[index] == 1;
}
return 0;
}
static void gpset(BCM2835GpioState *s,
uint32_t val, uint8_t start, uint8_t count, uint32_t *lev)
{
uint32_t changes = val & ~*lev;
uint32_t cur = 1;
int i;
for (i = 0; i < count; i++) {
if ((changes & cur) && (gpfsel_is_out(s, start + i))) {
qemu_set_irq(s->out[start + i], 1);
}
cur <<= 1;
}
*lev |= val;
}
static void gpclr(BCM2835GpioState *s,
uint32_t val, uint8_t start, uint8_t count, uint32_t *lev)
{
uint32_t changes = val & *lev;
uint32_t cur = 1;
int i;
for (i = 0; i < count; i++) {
if ((changes & cur) && (gpfsel_is_out(s, start + i))) {
qemu_set_irq(s->out[start + i], 0);
}
cur <<= 1;
}
*lev &= ~val;
}
static uint64_t bcm2835_gpio_read(void *opaque, hwaddr offset,
unsigned size)
{
BCM2835GpioState *s = (BCM2835GpioState *)opaque;
switch (offset) {
case GPFSEL0:
case GPFSEL1:
case GPFSEL2:
case GPFSEL3:
case GPFSEL4:
case GPFSEL5:
return gpfsel_get(s, offset / 4);
case GPSET0:
case GPSET1:
/* Write Only */
return 0;
case GPCLR0:
case GPCLR1:
/* Write Only */
return 0;
case GPLEV0:
return s->lev0;
case GPLEV1:
return s->lev1;
case GPEDS0:
case GPEDS1:
case GPREN0:
case GPREN1:
case GPFEN0:
case GPFEN1:
case GPHEN0:
case GPHEN1:
case GPLEN0:
case GPLEN1:
case GPAREN0:
case GPAREN1:
case GPAFEN0:
case GPAFEN1:
case GPPUD:
case GPPUDCLK0:
case GPPUDCLK1:
/* Not implemented */
return 0;
default:
qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
__func__, offset);
break;
}
return 0;
}
static void bcm2835_gpio_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
BCM2835GpioState *s = (BCM2835GpioState *)opaque;
switch (offset) {
case GPFSEL0:
case GPFSEL1:
case GPFSEL2:
case GPFSEL3:
case GPFSEL4:
case GPFSEL5:
gpfsel_set(s, offset / 4, value);
break;
case GPSET0:
gpset(s, value, 0, 32, &s->lev0);
break;
case GPSET1:
gpset(s, value, 32, 22, &s->lev1);
break;
case GPCLR0:
gpclr(s, value, 0, 32, &s->lev0);
break;
case GPCLR1:
gpclr(s, value, 32, 22, &s->lev1);
break;
case GPLEV0:
case GPLEV1:
/* Read Only */
break;
case GPEDS0:
case GPEDS1:
case GPREN0:
case GPREN1:
case GPFEN0:
case GPFEN1:
case GPHEN0:
case GPHEN1:
case GPLEN0:
case GPLEN1:
case GPAREN0:
case GPAREN1:
case GPAFEN0:
case GPAFEN1:
case GPPUD:
case GPPUDCLK0:
case GPPUDCLK1:
/* Not implemented */
break;
default:
goto err_out;
}
return;
err_out:
qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
__func__, offset);
}
static void bcm2835_gpio_reset(DeviceState *dev)
{
BCM2835GpioState *s = BCM2835_GPIO(dev);
int i;
for (i = 0; i < 6; i++) {
gpfsel_set(s, i, 0);
}
s->sd_fsel = 0;
/* SDHCI is selected by default */
sdbus_reparent_card(&s->sdbus, s->sdbus_sdhci);
s->lev0 = 0;
s->lev1 = 0;
}
static const MemoryRegionOps bcm2835_gpio_ops = {
.read = bcm2835_gpio_read,
.write = bcm2835_gpio_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static const VMStateDescription vmstate_bcm2835_gpio = {
.name = "bcm2835_gpio",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT8_ARRAY(fsel, BCM2835GpioState, 54),
VMSTATE_UINT32(lev0, BCM2835GpioState),
VMSTATE_UINT32(lev1, BCM2835GpioState),
VMSTATE_UINT8(sd_fsel, BCM2835GpioState),
VMSTATE_END_OF_LIST()
}
};
static void bcm2835_gpio_init(Object *obj)
{
BCM2835GpioState *s = BCM2835_GPIO(obj);
DeviceState *dev = DEVICE(obj);
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
qbus_create_inplace(&s->sdbus, sizeof(s->sdbus),
TYPE_SD_BUS, DEVICE(s), "sd-bus");
memory_region_init_io(&s->iomem, obj,
&bcm2835_gpio_ops, s, "bcm2835_gpio", 0x1000);
sysbus_init_mmio(sbd, &s->iomem);
qdev_init_gpio_out(dev, s->out, 54);
}
static void bcm2835_gpio_realize(DeviceState *dev, Error **errp)
{
BCM2835GpioState *s = BCM2835_GPIO(dev);
Object *obj;
Error *err = NULL;
obj = object_property_get_link(OBJECT(dev), "sdbus-sdhci", &err);
if (obj == NULL) {
error_setg(errp, "%s: required sdhci link not found: %s",
__func__, error_get_pretty(err));
return;
}
s->sdbus_sdhci = SD_BUS(obj);
obj = object_property_get_link(OBJECT(dev), "sdbus-sdhost", &err);
if (obj == NULL) {
error_setg(errp, "%s: required sdhost link not found: %s",
__func__, error_get_pretty(err));
return;
}
s->sdbus_sdhost = SD_BUS(obj);
}
static void bcm2835_gpio_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->vmsd = &vmstate_bcm2835_gpio;
dc->realize = &bcm2835_gpio_realize;
dc->reset = &bcm2835_gpio_reset;
}
static const TypeInfo bcm2835_gpio_info = {
.name = TYPE_BCM2835_GPIO,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(BCM2835GpioState),
.instance_init = bcm2835_gpio_init,
.class_init = bcm2835_gpio_class_init,
};
static void bcm2835_gpio_register_types(void)
{
type_register_static(&bcm2835_gpio_info);
}
type_init(bcm2835_gpio_register_types)
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