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Diffstat (limited to 'hw/exynos4210_i2c.c')
-rw-r--r--hw/exynos4210_i2c.c334
1 files changed, 0 insertions, 334 deletions
diff --git a/hw/exynos4210_i2c.c b/hw/exynos4210_i2c.c
deleted file mode 100644
index 9e42875..0000000
--- a/hw/exynos4210_i2c.c
+++ /dev/null
@@ -1,334 +0,0 @@
-/*
- * Exynos4210 I2C Bus Serial Interface Emulation
- *
- * Copyright (C) 2012 Samsung Electronics Co Ltd.
- * Maksim Kozlov, <m.kozlov@samsung.com>
- * Igor Mitsyanko, <i.mitsyanko@samsung.com>
- *
- * 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 of the License, or
- * (at your option) any later version.
- *
- * 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/timer.h"
-#include "hw/sysbus.h"
-#include "hw/i2c.h"
-
-#ifndef EXYNOS4_I2C_DEBUG
-#define EXYNOS4_I2C_DEBUG 0
-#endif
-
-#define TYPE_EXYNOS4_I2C "exynos4210.i2c"
-#define EXYNOS4_I2C(obj) \
- OBJECT_CHECK(Exynos4210I2CState, (obj), TYPE_EXYNOS4_I2C)
-
-/* Exynos4210 I2C memory map */
-#define EXYNOS4_I2C_MEM_SIZE 0x14
-#define I2CCON_ADDR 0x00 /* control register */
-#define I2CSTAT_ADDR 0x04 /* control/status register */
-#define I2CADD_ADDR 0x08 /* address register */
-#define I2CDS_ADDR 0x0c /* data shift register */
-#define I2CLC_ADDR 0x10 /* line control register */
-
-#define I2CCON_ACK_GEN (1 << 7)
-#define I2CCON_INTRS_EN (1 << 5)
-#define I2CCON_INT_PEND (1 << 4)
-
-#define EXYNOS4_I2C_MODE(reg) (((reg) >> 6) & 3)
-#define I2C_IN_MASTER_MODE(reg) (((reg) >> 6) & 2)
-#define I2CMODE_MASTER_Rx 0x2
-#define I2CMODE_MASTER_Tx 0x3
-#define I2CSTAT_LAST_BIT (1 << 0)
-#define I2CSTAT_OUTPUT_EN (1 << 4)
-#define I2CSTAT_START_BUSY (1 << 5)
-
-
-#if EXYNOS4_I2C_DEBUG
-#define DPRINT(fmt, args...) \
- do { fprintf(stderr, "QEMU I2C: "fmt, ## args); } while (0)
-
-static const char *exynos4_i2c_get_regname(unsigned offset)
-{
- switch (offset) {
- case I2CCON_ADDR:
- return "I2CCON";
- case I2CSTAT_ADDR:
- return "I2CSTAT";
- case I2CADD_ADDR:
- return "I2CADD";
- case I2CDS_ADDR:
- return "I2CDS";
- case I2CLC_ADDR:
- return "I2CLC";
- default:
- return "[?]";
- }
-}
-
-#else
-#define DPRINT(fmt, args...) do { } while (0)
-#endif
-
-typedef struct Exynos4210I2CState {
- SysBusDevice busdev;
- MemoryRegion iomem;
- i2c_bus *bus;
- qemu_irq irq;
-
- uint8_t i2ccon;
- uint8_t i2cstat;
- uint8_t i2cadd;
- uint8_t i2cds;
- uint8_t i2clc;
- bool scl_free;
-} Exynos4210I2CState;
-
-static inline void exynos4210_i2c_raise_interrupt(Exynos4210I2CState *s)
-{
- if (s->i2ccon & I2CCON_INTRS_EN) {
- s->i2ccon |= I2CCON_INT_PEND;
- qemu_irq_raise(s->irq);
- }
-}
-
-static void exynos4210_i2c_data_receive(void *opaque)
-{
- Exynos4210I2CState *s = (Exynos4210I2CState *)opaque;
- int ret;
-
- s->i2cstat &= ~I2CSTAT_LAST_BIT;
- s->scl_free = false;
- ret = i2c_recv(s->bus);
- if (ret < 0 && (s->i2ccon & I2CCON_ACK_GEN)) {
- s->i2cstat |= I2CSTAT_LAST_BIT; /* Data is not acknowledged */
- } else {
- s->i2cds = ret;
- }
- exynos4210_i2c_raise_interrupt(s);
-}
-
-static void exynos4210_i2c_data_send(void *opaque)
-{
- Exynos4210I2CState *s = (Exynos4210I2CState *)opaque;
-
- s->i2cstat &= ~I2CSTAT_LAST_BIT;
- s->scl_free = false;
- if (i2c_send(s->bus, s->i2cds) < 0 && (s->i2ccon & I2CCON_ACK_GEN)) {
- s->i2cstat |= I2CSTAT_LAST_BIT;
- }
- exynos4210_i2c_raise_interrupt(s);
-}
-
-static uint64_t exynos4210_i2c_read(void *opaque, hwaddr offset,
- unsigned size)
-{
- Exynos4210I2CState *s = (Exynos4210I2CState *)opaque;
- uint8_t value;
-
- switch (offset) {
- case I2CCON_ADDR:
- value = s->i2ccon;
- break;
- case I2CSTAT_ADDR:
- value = s->i2cstat;
- break;
- case I2CADD_ADDR:
- value = s->i2cadd;
- break;
- case I2CDS_ADDR:
- value = s->i2cds;
- s->scl_free = true;
- if (EXYNOS4_I2C_MODE(s->i2cstat) == I2CMODE_MASTER_Rx &&
- (s->i2cstat & I2CSTAT_START_BUSY) &&
- !(s->i2ccon & I2CCON_INT_PEND)) {
- exynos4210_i2c_data_receive(s);
- }
- break;
- case I2CLC_ADDR:
- value = s->i2clc;
- break;
- default:
- value = 0;
- DPRINT("ERROR: Bad read offset 0x%x\n", (unsigned int)offset);
- break;
- }
-
- DPRINT("read %s [0x%02x] -> 0x%02x\n", exynos4_i2c_get_regname(offset),
- (unsigned int)offset, value);
- return value;
-}
-
-static void exynos4210_i2c_write(void *opaque, hwaddr offset,
- uint64_t value, unsigned size)
-{
- Exynos4210I2CState *s = (Exynos4210I2CState *)opaque;
- uint8_t v = value & 0xff;
-
- DPRINT("write %s [0x%02x] <- 0x%02x\n", exynos4_i2c_get_regname(offset),
- (unsigned int)offset, v);
-
- switch (offset) {
- case I2CCON_ADDR:
- s->i2ccon = (v & ~I2CCON_INT_PEND) | (s->i2ccon & I2CCON_INT_PEND);
- if ((s->i2ccon & I2CCON_INT_PEND) && !(v & I2CCON_INT_PEND)) {
- s->i2ccon &= ~I2CCON_INT_PEND;
- qemu_irq_lower(s->irq);
- if (!(s->i2ccon & I2CCON_INTRS_EN)) {
- s->i2cstat &= ~I2CSTAT_START_BUSY;
- }
-
- if (s->i2cstat & I2CSTAT_START_BUSY) {
- if (s->scl_free) {
- if (EXYNOS4_I2C_MODE(s->i2cstat) == I2CMODE_MASTER_Tx) {
- exynos4210_i2c_data_send(s);
- } else if (EXYNOS4_I2C_MODE(s->i2cstat) ==
- I2CMODE_MASTER_Rx) {
- exynos4210_i2c_data_receive(s);
- }
- } else {
- s->i2ccon |= I2CCON_INT_PEND;
- qemu_irq_raise(s->irq);
- }
- }
- }
- break;
- case I2CSTAT_ADDR:
- s->i2cstat =
- (s->i2cstat & I2CSTAT_START_BUSY) | (v & ~I2CSTAT_START_BUSY);
-
- if (!(s->i2cstat & I2CSTAT_OUTPUT_EN)) {
- s->i2cstat &= ~I2CSTAT_START_BUSY;
- s->scl_free = true;
- qemu_irq_lower(s->irq);
- break;
- }
-
- /* Nothing to do if in i2c slave mode */
- if (!I2C_IN_MASTER_MODE(s->i2cstat)) {
- break;
- }
-
- if (v & I2CSTAT_START_BUSY) {
- s->i2cstat &= ~I2CSTAT_LAST_BIT;
- s->i2cstat |= I2CSTAT_START_BUSY; /* Line is busy */
- s->scl_free = false;
-
- /* Generate start bit and send slave address */
- if (i2c_start_transfer(s->bus, s->i2cds >> 1, s->i2cds & 0x1) &&
- (s->i2ccon & I2CCON_ACK_GEN)) {
- s->i2cstat |= I2CSTAT_LAST_BIT;
- } else if (EXYNOS4_I2C_MODE(s->i2cstat) == I2CMODE_MASTER_Rx) {
- exynos4210_i2c_data_receive(s);
- }
- exynos4210_i2c_raise_interrupt(s);
- } else {
- i2c_end_transfer(s->bus);
- if (!(s->i2ccon & I2CCON_INT_PEND)) {
- s->i2cstat &= ~I2CSTAT_START_BUSY;
- }
- s->scl_free = true;
- }
- break;
- case I2CADD_ADDR:
- if ((s->i2cstat & I2CSTAT_OUTPUT_EN) == 0) {
- s->i2cadd = v;
- }
- break;
- case I2CDS_ADDR:
- if (s->i2cstat & I2CSTAT_OUTPUT_EN) {
- s->i2cds = v;
- s->scl_free = true;
- if (EXYNOS4_I2C_MODE(s->i2cstat) == I2CMODE_MASTER_Tx &&
- (s->i2cstat & I2CSTAT_START_BUSY) &&
- !(s->i2ccon & I2CCON_INT_PEND)) {
- exynos4210_i2c_data_send(s);
- }
- }
- break;
- case I2CLC_ADDR:
- s->i2clc = v;
- break;
- default:
- DPRINT("ERROR: Bad write offset 0x%x\n", (unsigned int)offset);
- break;
- }
-}
-
-static const MemoryRegionOps exynos4210_i2c_ops = {
- .read = exynos4210_i2c_read,
- .write = exynos4210_i2c_write,
- .endianness = DEVICE_NATIVE_ENDIAN,
-};
-
-static const VMStateDescription exynos4210_i2c_vmstate = {
- .name = TYPE_EXYNOS4_I2C,
- .version_id = 1,
- .minimum_version_id = 1,
- .fields = (VMStateField[]) {
- VMSTATE_UINT8(i2ccon, Exynos4210I2CState),
- VMSTATE_UINT8(i2cstat, Exynos4210I2CState),
- VMSTATE_UINT8(i2cds, Exynos4210I2CState),
- VMSTATE_UINT8(i2cadd, Exynos4210I2CState),
- VMSTATE_UINT8(i2clc, Exynos4210I2CState),
- VMSTATE_BOOL(scl_free, Exynos4210I2CState),
- VMSTATE_END_OF_LIST()
- }
-};
-
-static void exynos4210_i2c_reset(DeviceState *d)
-{
- Exynos4210I2CState *s = EXYNOS4_I2C(d);
-
- s->i2ccon = 0x00;
- s->i2cstat = 0x00;
- s->i2cds = 0xFF;
- s->i2clc = 0x00;
- s->i2cadd = 0xFF;
- s->scl_free = true;
-}
-
-static int exynos4210_i2c_realize(SysBusDevice *dev)
-{
- Exynos4210I2CState *s = EXYNOS4_I2C(dev);
-
- memory_region_init_io(&s->iomem, &exynos4210_i2c_ops, s, TYPE_EXYNOS4_I2C,
- EXYNOS4_I2C_MEM_SIZE);
- sysbus_init_mmio(dev, &s->iomem);
- sysbus_init_irq(dev, &s->irq);
- s->bus = i2c_init_bus(&dev->qdev, "i2c");
- return 0;
-}
-
-static void exynos4210_i2c_class_init(ObjectClass *klass, void *data)
-{
- DeviceClass *dc = DEVICE_CLASS(klass);
- SysBusDeviceClass *sbdc = SYS_BUS_DEVICE_CLASS(klass);
-
- dc->vmsd = &exynos4210_i2c_vmstate;
- dc->reset = exynos4210_i2c_reset;
- sbdc->init = exynos4210_i2c_realize;
-}
-
-static const TypeInfo exynos4210_i2c_type_info = {
- .name = TYPE_EXYNOS4_I2C,
- .parent = TYPE_SYS_BUS_DEVICE,
- .instance_size = sizeof(Exynos4210I2CState),
- .class_init = exynos4210_i2c_class_init,
-};
-
-static void exynos4210_i2c_register_types(void)
-{
- type_register_static(&exynos4210_i2c_type_info);
-}
-
-type_init(exynos4210_i2c_register_types)
generated by cgit v1.1 at 2025-01-06 08:04:43 +0000