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-rw-r--r--hw/gpio/sifive_gpio.c397
1 files changed, 397 insertions, 0 deletions
diff --git a/hw/gpio/sifive_gpio.c b/hw/gpio/sifive_gpio.c
new file mode 100644
index 0000000000..78bf29e996
--- /dev/null
+++ b/hw/gpio/sifive_gpio.c
@@ -0,0 +1,397 @@
+/*
+ * SiFive System-on-Chip general purpose input/output register definition
+ *
+ * Copyright 2019 AdaCore
+ *
+ * Base on nrf51_gpio.c:
+ *
+ * Copyright 2018 Steffen Görtz <contrib@steffen-goertz.de>
+ *
+ * This code is licensed under the GPL version 2 or later. See
+ * the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/log.h"
+#include "hw/irq.h"
+#include "hw/qdev-properties.h"
+#include "hw/gpio/sifive_gpio.h"
+#include "migration/vmstate.h"
+#include "trace.h"
+
+static void update_output_irq(SIFIVEGPIOState *s)
+{
+ uint32_t pending;
+ uint32_t pin;
+
+ pending = s->high_ip & s->high_ie;
+ pending |= s->low_ip & s->low_ie;
+ pending |= s->rise_ip & s->rise_ie;
+ pending |= s->fall_ip & s->fall_ie;
+
+ for (int i = 0; i < s->ngpio; i++) {
+ pin = 1 << i;
+ qemu_set_irq(s->irq[i], (pending & pin) != 0);
+ trace_sifive_gpio_update_output_irq(i, (pending & pin) != 0);
+ }
+}
+
+static void update_state(SIFIVEGPIOState *s)
+{
+ size_t i;
+ bool prev_ival, in, in_mask, port, out_xor, pull, output_en, input_en,
+ rise_ip, fall_ip, low_ip, high_ip, oval, actual_value, ival;
+
+ for (i = 0; i < s->ngpio; i++) {
+
+ prev_ival = extract32(s->value, i, 1);
+ in = extract32(s->in, i, 1);
+ in_mask = extract32(s->in_mask, i, 1);
+ port = extract32(s->port, i, 1);
+ out_xor = extract32(s->out_xor, i, 1);
+ pull = extract32(s->pue, i, 1);
+ output_en = extract32(s->output_en, i, 1);
+ input_en = extract32(s->input_en, i, 1);
+ rise_ip = extract32(s->rise_ip, i, 1);
+ fall_ip = extract32(s->fall_ip, i, 1);
+ low_ip = extract32(s->low_ip, i, 1);
+ high_ip = extract32(s->high_ip, i, 1);
+
+ /* Output value (IOF not supported) */
+ oval = output_en && (port ^ out_xor);
+
+ /* Pin both driven externally and internally */
+ if (output_en && in_mask) {
+ qemu_log_mask(LOG_GUEST_ERROR, "GPIO pin %zu short circuited\n", i);
+ }
+
+ if (in_mask) {
+ /* The pin is driven by external device */
+ actual_value = in;
+ } else if (output_en) {
+ /* The pin is driven by internal circuit */
+ actual_value = oval;
+ } else {
+ /* Floating? Apply pull-up resistor */
+ actual_value = pull;
+ }
+
+ if (output_en) {
+ qemu_set_irq(s->output[i], actual_value);
+ }
+
+ /* Input value */
+ ival = input_en && actual_value;
+
+ /* Interrupts */
+ high_ip = high_ip || ival;
+ s->high_ip = deposit32(s->high_ip, i, 1, high_ip);
+
+ low_ip = low_ip || !ival;
+ s->low_ip = deposit32(s->low_ip, i, 1, low_ip);
+
+ rise_ip = rise_ip || (ival && !prev_ival);
+ s->rise_ip = deposit32(s->rise_ip, i, 1, rise_ip);
+
+ fall_ip = fall_ip || (!ival && prev_ival);
+ s->fall_ip = deposit32(s->fall_ip, i, 1, fall_ip);
+
+ /* Update value */
+ s->value = deposit32(s->value, i, 1, ival);
+ }
+ update_output_irq(s);
+}
+
+static uint64_t sifive_gpio_read(void *opaque, hwaddr offset, unsigned int size)
+{
+ SIFIVEGPIOState *s = SIFIVE_GPIO(opaque);
+ uint64_t r = 0;
+
+ switch (offset) {
+ case SIFIVE_GPIO_REG_VALUE:
+ r = s->value;
+ break;
+
+ case SIFIVE_GPIO_REG_INPUT_EN:
+ r = s->input_en;
+ break;
+
+ case SIFIVE_GPIO_REG_OUTPUT_EN:
+ r = s->output_en;
+ break;
+
+ case SIFIVE_GPIO_REG_PORT:
+ r = s->port;
+ break;
+
+ case SIFIVE_GPIO_REG_PUE:
+ r = s->pue;
+ break;
+
+ case SIFIVE_GPIO_REG_DS:
+ r = s->ds;
+ break;
+
+ case SIFIVE_GPIO_REG_RISE_IE:
+ r = s->rise_ie;
+ break;
+
+ case SIFIVE_GPIO_REG_RISE_IP:
+ r = s->rise_ip;
+ break;
+
+ case SIFIVE_GPIO_REG_FALL_IE:
+ r = s->fall_ie;
+ break;
+
+ case SIFIVE_GPIO_REG_FALL_IP:
+ r = s->fall_ip;
+ break;
+
+ case SIFIVE_GPIO_REG_HIGH_IE:
+ r = s->high_ie;
+ break;
+
+ case SIFIVE_GPIO_REG_HIGH_IP:
+ r = s->high_ip;
+ break;
+
+ case SIFIVE_GPIO_REG_LOW_IE:
+ r = s->low_ie;
+ break;
+
+ case SIFIVE_GPIO_REG_LOW_IP:
+ r = s->low_ip;
+ break;
+
+ case SIFIVE_GPIO_REG_IOF_EN:
+ r = s->iof_en;
+ break;
+
+ case SIFIVE_GPIO_REG_IOF_SEL:
+ r = s->iof_sel;
+ break;
+
+ case SIFIVE_GPIO_REG_OUT_XOR:
+ r = s->out_xor;
+ break;
+
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: bad read offset 0x%" HWADDR_PRIx "\n",
+ __func__, offset);
+ }
+
+ trace_sifive_gpio_read(offset, r);
+
+ return r;
+}
+
+static void sifive_gpio_write(void *opaque, hwaddr offset,
+ uint64_t value, unsigned int size)
+{
+ SIFIVEGPIOState *s = SIFIVE_GPIO(opaque);
+
+ trace_sifive_gpio_write(offset, value);
+
+ switch (offset) {
+
+ case SIFIVE_GPIO_REG_INPUT_EN:
+ s->input_en = value;
+ break;
+
+ case SIFIVE_GPIO_REG_OUTPUT_EN:
+ s->output_en = value;
+ break;
+
+ case SIFIVE_GPIO_REG_PORT:
+ s->port = value;
+ break;
+
+ case SIFIVE_GPIO_REG_PUE:
+ s->pue = value;
+ break;
+
+ case SIFIVE_GPIO_REG_DS:
+ s->ds = value;
+ break;
+
+ case SIFIVE_GPIO_REG_RISE_IE:
+ s->rise_ie = value;
+ break;
+
+ case SIFIVE_GPIO_REG_RISE_IP:
+ /* Write 1 to clear */
+ s->rise_ip &= ~value;
+ break;
+
+ case SIFIVE_GPIO_REG_FALL_IE:
+ s->fall_ie = value;
+ break;
+
+ case SIFIVE_GPIO_REG_FALL_IP:
+ /* Write 1 to clear */
+ s->fall_ip &= ~value;
+ break;
+
+ case SIFIVE_GPIO_REG_HIGH_IE:
+ s->high_ie = value;
+ break;
+
+ case SIFIVE_GPIO_REG_HIGH_IP:
+ /* Write 1 to clear */
+ s->high_ip &= ~value;
+ break;
+
+ case SIFIVE_GPIO_REG_LOW_IE:
+ s->low_ie = value;
+ break;
+
+ case SIFIVE_GPIO_REG_LOW_IP:
+ /* Write 1 to clear */
+ s->low_ip &= ~value;
+ break;
+
+ case SIFIVE_GPIO_REG_IOF_EN:
+ s->iof_en = value;
+ break;
+
+ case SIFIVE_GPIO_REG_IOF_SEL:
+ s->iof_sel = value;
+ break;
+
+ case SIFIVE_GPIO_REG_OUT_XOR:
+ s->out_xor = value;
+ break;
+
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: bad write offset 0x%" HWADDR_PRIx "\n",
+ __func__, offset);
+ }
+
+ update_state(s);
+}
+
+static const MemoryRegionOps gpio_ops = {
+ .read = sifive_gpio_read,
+ .write = sifive_gpio_write,
+ .endianness = DEVICE_LITTLE_ENDIAN,
+ .impl.min_access_size = 4,
+ .impl.max_access_size = 4,
+};
+
+static void sifive_gpio_set(void *opaque, int line, int value)
+{
+ SIFIVEGPIOState *s = SIFIVE_GPIO(opaque);
+
+ trace_sifive_gpio_set(line, value);
+
+ assert(line >= 0 && line < SIFIVE_GPIO_PINS);
+
+ s->in_mask = deposit32(s->in_mask, line, 1, value >= 0);
+ if (value >= 0) {
+ s->in = deposit32(s->in, line, 1, value != 0);
+ }
+
+ update_state(s);
+}
+
+static void sifive_gpio_reset(DeviceState *dev)
+{
+ SIFIVEGPIOState *s = SIFIVE_GPIO(dev);
+
+ s->value = 0;
+ s->input_en = 0;
+ s->output_en = 0;
+ s->port = 0;
+ s->pue = 0;
+ s->ds = 0;
+ s->rise_ie = 0;
+ s->rise_ip = 0;
+ s->fall_ie = 0;
+ s->fall_ip = 0;
+ s->high_ie = 0;
+ s->high_ip = 0;
+ s->low_ie = 0;
+ s->low_ip = 0;
+ s->iof_en = 0;
+ s->iof_sel = 0;
+ s->out_xor = 0;
+ s->in = 0;
+ s->in_mask = 0;
+}
+
+static const VMStateDescription vmstate_sifive_gpio = {
+ .name = TYPE_SIFIVE_GPIO,
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT32(value, SIFIVEGPIOState),
+ VMSTATE_UINT32(input_en, SIFIVEGPIOState),
+ VMSTATE_UINT32(output_en, SIFIVEGPIOState),
+ VMSTATE_UINT32(port, SIFIVEGPIOState),
+ VMSTATE_UINT32(pue, SIFIVEGPIOState),
+ VMSTATE_UINT32(rise_ie, SIFIVEGPIOState),
+ VMSTATE_UINT32(rise_ip, SIFIVEGPIOState),
+ VMSTATE_UINT32(fall_ie, SIFIVEGPIOState),
+ VMSTATE_UINT32(fall_ip, SIFIVEGPIOState),
+ VMSTATE_UINT32(high_ie, SIFIVEGPIOState),
+ VMSTATE_UINT32(high_ip, SIFIVEGPIOState),
+ VMSTATE_UINT32(low_ie, SIFIVEGPIOState),
+ VMSTATE_UINT32(low_ip, SIFIVEGPIOState),
+ VMSTATE_UINT32(iof_en, SIFIVEGPIOState),
+ VMSTATE_UINT32(iof_sel, SIFIVEGPIOState),
+ VMSTATE_UINT32(out_xor, SIFIVEGPIOState),
+ VMSTATE_UINT32(in, SIFIVEGPIOState),
+ VMSTATE_UINT32(in_mask, SIFIVEGPIOState),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static Property sifive_gpio_properties[] = {
+ DEFINE_PROP_UINT32("ngpio", SIFIVEGPIOState, ngpio, SIFIVE_GPIO_PINS),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void sifive_gpio_realize(DeviceState *dev, Error **errp)
+{
+ SIFIVEGPIOState *s = SIFIVE_GPIO(dev);
+
+ memory_region_init_io(&s->mmio, OBJECT(dev), &gpio_ops, s,
+ TYPE_SIFIVE_GPIO, SIFIVE_GPIO_SIZE);
+
+ sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->mmio);
+
+ for (int i = 0; i < s->ngpio; i++) {
+ sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->irq[i]);
+ }
+
+ qdev_init_gpio_in(DEVICE(s), sifive_gpio_set, s->ngpio);
+ qdev_init_gpio_out(DEVICE(s), s->output, s->ngpio);
+}
+
+static void sifive_gpio_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ device_class_set_props(dc, sifive_gpio_properties);
+ dc->vmsd = &vmstate_sifive_gpio;
+ dc->realize = sifive_gpio_realize;
+ dc->reset = sifive_gpio_reset;
+ dc->desc = "SiFive GPIO";
+}
+
+static const TypeInfo sifive_gpio_info = {
+ .name = TYPE_SIFIVE_GPIO,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(SIFIVEGPIOState),
+ .class_init = sifive_gpio_class_init
+};
+
+static void sifive_gpio_register_types(void)
+{
+ type_register_static(&sifive_gpio_info);
+}
+
+type_init(sifive_gpio_register_types)