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qemu/hw/i2c/aspeed_i2c.c
Cédric Le Goater 602610383f aspeed/i2c: QOMify AspeedI2CBus 
Introduce an AspeedI2CBus SysBusDevice model and attach the associated
memory region and IRQ to the newly instantiated objects.

Before this change, the I2C bus IRQs were all attached to the
SysBusDevice model of the I2C controller. Adapt the AST2600 SoC
realize routine to take into account this change.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
2021-10-12 08:20:08 +02:00

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/*
* ARM Aspeed I2C controller
*
* Copyright (C) 2016 IBM Corp.
*
* 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/osdep.h"
#include "hw/sysbus.h"
#include "migration/vmstate.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
#include "hw/i2c/aspeed_i2c.h"
#include "hw/irq.h"
#include "hw/qdev-properties.h"
#include "trace.h"
/* I2C Global Register */
#define I2C_CTRL_STATUS 0x00 /* Device Interrupt Status */
#define I2C_CTRL_ASSIGN 0x08 /* Device Interrupt Target
Assignment */
#define I2C_CTRL_GLOBAL 0x0C /* Global Control Register */
#define I2C_CTRL_SRAM_EN BIT(0)
/* I2C Device (Bus) Register */
#define I2CD_FUN_CTRL_REG 0x00 /* I2CD Function Control */
#define I2CD_POOL_PAGE_SEL(x) (((x) >> 20) & 0x7) /* AST2400 */
#define I2CD_M_SDA_LOCK_EN (0x1 << 16)
#define I2CD_MULTI_MASTER_DIS (0x1 << 15)
#define I2CD_M_SCL_DRIVE_EN (0x1 << 14)
#define I2CD_MSB_STS (0x1 << 9)
#define I2CD_SDA_DRIVE_1T_EN (0x1 << 8)
#define I2CD_M_SDA_DRIVE_1T_EN (0x1 << 7)
#define I2CD_M_HIGH_SPEED_EN (0x1 << 6)
#define I2CD_DEF_ADDR_EN (0x1 << 5)
#define I2CD_DEF_ALERT_EN (0x1 << 4)
#define I2CD_DEF_ARP_EN (0x1 << 3)
#define I2CD_DEF_GCALL_EN (0x1 << 2)
#define I2CD_SLAVE_EN (0x1 << 1)
#define I2CD_MASTER_EN (0x1)
#define I2CD_AC_TIMING_REG1 0x04 /* Clock and AC Timing Control #1 */
#define I2CD_AC_TIMING_REG2 0x08 /* Clock and AC Timing Control #1 */
#define I2CD_INTR_CTRL_REG 0x0c /* I2CD Interrupt Control */
#define I2CD_INTR_STS_REG 0x10 /* I2CD Interrupt Status */
#define I2CD_INTR_SLAVE_ADDR_MATCH (0x1 << 31) /* 0: addr1 1: addr2 */
#define I2CD_INTR_SLAVE_ADDR_RX_PENDING (0x1 << 30)
/* bits[19-16] Reserved */
/* All bits below are cleared by writing 1 */
#define I2CD_INTR_SLAVE_INACTIVE_TIMEOUT (0x1 << 15)
#define I2CD_INTR_SDA_DL_TIMEOUT (0x1 << 14)
#define I2CD_INTR_BUS_RECOVER_DONE (0x1 << 13)
#define I2CD_INTR_SMBUS_ALERT (0x1 << 12) /* Bus [0-3] only */
#define I2CD_INTR_SMBUS_ARP_ADDR (0x1 << 11) /* Removed */
#define I2CD_INTR_SMBUS_DEV_ALERT_ADDR (0x1 << 10) /* Removed */
#define I2CD_INTR_SMBUS_DEF_ADDR (0x1 << 9) /* Removed */
#define I2CD_INTR_GCALL_ADDR (0x1 << 8) /* Removed */
#define I2CD_INTR_SLAVE_ADDR_RX_MATCH (0x1 << 7) /* use RX_DONE */
#define I2CD_INTR_SCL_TIMEOUT (0x1 << 6)
#define I2CD_INTR_ABNORMAL (0x1 << 5)
#define I2CD_INTR_NORMAL_STOP (0x1 << 4)
#define I2CD_INTR_ARBIT_LOSS (0x1 << 3)
#define I2CD_INTR_RX_DONE (0x1 << 2)
#define I2CD_INTR_TX_NAK (0x1 << 1)
#define I2CD_INTR_TX_ACK (0x1 << 0)
#define I2CD_CMD_REG 0x14 /* I2CD Command/Status */
#define I2CD_SDA_OE (0x1 << 28)
#define I2CD_SDA_O (0x1 << 27)
#define I2CD_SCL_OE (0x1 << 26)
#define I2CD_SCL_O (0x1 << 25)
#define I2CD_TX_TIMING (0x1 << 24)
#define I2CD_TX_STATUS (0x1 << 23)
#define I2CD_TX_STATE_SHIFT 19 /* Tx State Machine */
#define I2CD_TX_STATE_MASK 0xf
#define I2CD_IDLE 0x0
#define I2CD_MACTIVE 0x8
#define I2CD_MSTART 0x9
#define I2CD_MSTARTR 0xa
#define I2CD_MSTOP 0xb
#define I2CD_MTXD 0xc
#define I2CD_MRXACK 0xd
#define I2CD_MRXD 0xe
#define I2CD_MTXACK 0xf
#define I2CD_SWAIT 0x1
#define I2CD_SRXD 0x4
#define I2CD_STXACK 0x5
#define I2CD_STXD 0x6
#define I2CD_SRXACK 0x7
#define I2CD_RECOVER 0x3
#define I2CD_SCL_LINE_STS (0x1 << 18)
#define I2CD_SDA_LINE_STS (0x1 << 17)
#define I2CD_BUS_BUSY_STS (0x1 << 16)
#define I2CD_SDA_OE_OUT_DIR (0x1 << 15)
#define I2CD_SDA_O_OUT_DIR (0x1 << 14)
#define I2CD_SCL_OE_OUT_DIR (0x1 << 13)
#define I2CD_SCL_O_OUT_DIR (0x1 << 12)
#define I2CD_BUS_RECOVER_CMD_EN (0x1 << 11)
#define I2CD_S_ALT_EN (0x1 << 10)
/* Command Bit */
#define I2CD_RX_DMA_ENABLE (0x1 << 9)
#define I2CD_TX_DMA_ENABLE (0x1 << 8)
#define I2CD_RX_BUFF_ENABLE (0x1 << 7)
#define I2CD_TX_BUFF_ENABLE (0x1 << 6)
#define I2CD_M_STOP_CMD (0x1 << 5)
#define I2CD_M_S_RX_CMD_LAST (0x1 << 4)
#define I2CD_M_RX_CMD (0x1 << 3)
#define I2CD_S_TX_CMD (0x1 << 2)
#define I2CD_M_TX_CMD (0x1 << 1)
#define I2CD_M_START_CMD (0x1)
#define I2CD_DEV_ADDR_REG 0x18 /* Slave Device Address */
#define I2CD_POOL_CTRL_REG 0x1c /* Pool Buffer Control */
#define I2CD_POOL_RX_COUNT(x) (((x) >> 24) & 0xff)
#define I2CD_POOL_RX_SIZE(x) ((((x) >> 16) & 0xff) + 1)
#define I2CD_POOL_TX_COUNT(x) ((((x) >> 8) & 0xff) + 1)
#define I2CD_POOL_OFFSET(x) (((x) & 0x3f) << 2) /* AST2400 */
#define I2CD_BYTE_BUF_REG 0x20 /* Transmit/Receive Byte Buffer */
#define I2CD_BYTE_BUF_TX_SHIFT 0
#define I2CD_BYTE_BUF_TX_MASK 0xff
#define I2CD_BYTE_BUF_RX_SHIFT 8
#define I2CD_BYTE_BUF_RX_MASK 0xff
#define I2CD_DMA_ADDR 0x24 /* DMA Buffer Address */
#define I2CD_DMA_LEN 0x28 /* DMA Transfer Length < 4KB */
static inline bool aspeed_i2c_bus_is_master(AspeedI2CBus *bus)
{
return bus->ctrl & I2CD_MASTER_EN;
}
static inline bool aspeed_i2c_bus_is_enabled(AspeedI2CBus *bus)
{
return bus->ctrl & (I2CD_MASTER_EN | I2CD_SLAVE_EN);
}
static inline void aspeed_i2c_bus_raise_interrupt(AspeedI2CBus *bus)
{
AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(bus->controller);
trace_aspeed_i2c_bus_raise_interrupt(bus->intr_status,
bus->intr_status & I2CD_INTR_TX_NAK ? "nak|" : "",
bus->intr_status & I2CD_INTR_TX_ACK ? "ack|" : "",
bus->intr_status & I2CD_INTR_RX_DONE ? "done|" : "",
bus->intr_status & I2CD_INTR_NORMAL_STOP ? "normal|" : "",
bus->intr_status & I2CD_INTR_ABNORMAL ? "abnormal" : "");
bus->intr_status &= bus->intr_ctrl;
if (bus->intr_status) {
bus->controller->intr_status |= 1 << bus->id;
qemu_irq_raise(aic->bus_get_irq(bus));
}
}
static uint64_t aspeed_i2c_bus_read(void *opaque, hwaddr offset,
unsigned size)
{
AspeedI2CBus *bus = opaque;
AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(bus->controller);
uint64_t value = -1;
switch (offset) {
case I2CD_FUN_CTRL_REG:
value = bus->ctrl;
break;
case I2CD_AC_TIMING_REG1:
value = bus->timing[0];
break;
case I2CD_AC_TIMING_REG2:
value = bus->timing[1];
break;
case I2CD_INTR_CTRL_REG:
value = bus->intr_ctrl;
break;
case I2CD_INTR_STS_REG:
value = bus->intr_status;
break;
case I2CD_POOL_CTRL_REG:
value = bus->pool_ctrl;
break;
case I2CD_BYTE_BUF_REG:
value = bus->buf;
break;
case I2CD_CMD_REG:
value = bus->cmd | (i2c_bus_busy(bus->bus) << 16);
break;
case I2CD_DMA_ADDR:
if (!aic->has_dma) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: No DMA support\n", __func__);
break;
}
value = bus->dma_addr;
break;
case I2CD_DMA_LEN:
if (!aic->has_dma) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: No DMA support\n", __func__);
break;
}
value = bus->dma_len;
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, offset);
value = -1;
break;
}
trace_aspeed_i2c_bus_read(bus->id, offset, size, value);
return value;
}
static void aspeed_i2c_set_state(AspeedI2CBus *bus, uint8_t state)
{
bus->cmd &= ~(I2CD_TX_STATE_MASK << I2CD_TX_STATE_SHIFT);
bus->cmd |= (state & I2CD_TX_STATE_MASK) << I2CD_TX_STATE_SHIFT;
}
static uint8_t aspeed_i2c_get_state(AspeedI2CBus *bus)
{
return (bus->cmd >> I2CD_TX_STATE_SHIFT) & I2CD_TX_STATE_MASK;
}
static int aspeed_i2c_dma_read(AspeedI2CBus *bus, uint8_t *data)
{
MemTxResult result;
AspeedI2CState *s = bus->controller;
result = address_space_read(&s->dram_as, bus->dma_addr,
MEMTXATTRS_UNSPECIFIED, data, 1);
if (result != MEMTX_OK) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: DRAM read failed @%08x\n",
__func__, bus->dma_addr);
return -1;
}
bus->dma_addr++;
bus->dma_len--;
return 0;
}
static int aspeed_i2c_bus_send(AspeedI2CBus *bus, uint8_t pool_start)
{
AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(bus->controller);
int ret = -1;
int i;
if (bus->cmd & I2CD_TX_BUFF_ENABLE) {
for (i = pool_start; i < I2CD_POOL_TX_COUNT(bus->pool_ctrl); i++) {
uint8_t *pool_base = aic->bus_pool_base(bus);
trace_aspeed_i2c_bus_send("BUF", i + 1,
I2CD_POOL_TX_COUNT(bus->pool_ctrl),
pool_base[i]);
ret = i2c_send(bus->bus, pool_base[i]);
if (ret) {
break;
}
}
bus->cmd &= ~I2CD_TX_BUFF_ENABLE;
} else if (bus->cmd & I2CD_TX_DMA_ENABLE) {
while (bus->dma_len) {
uint8_t data;
aspeed_i2c_dma_read(bus, &data);
trace_aspeed_i2c_bus_send("DMA", bus->dma_len, bus->dma_len, data);
ret = i2c_send(bus->bus, data);
if (ret) {
break;
}
}
bus->cmd &= ~I2CD_TX_DMA_ENABLE;
} else {
trace_aspeed_i2c_bus_send("BYTE", pool_start, 1, bus->buf);
ret = i2c_send(bus->bus, bus->buf);
}
return ret;
}
static void aspeed_i2c_bus_recv(AspeedI2CBus *bus)
{
AspeedI2CState *s = bus->controller;
AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(s);
uint8_t data;
int i;
if (bus->cmd & I2CD_RX_BUFF_ENABLE) {
uint8_t *pool_base = aic->bus_pool_base(bus);
for (i = 0; i < I2CD_POOL_RX_SIZE(bus->pool_ctrl); i++) {
pool_base[i] = i2c_recv(bus->bus);
trace_aspeed_i2c_bus_recv("BUF", i + 1,
I2CD_POOL_RX_SIZE(bus->pool_ctrl),
pool_base[i]);
}
/* Update RX count */
bus->pool_ctrl &= ~(0xff << 24);
bus->pool_ctrl |= (i & 0xff) << 24;
bus->cmd &= ~I2CD_RX_BUFF_ENABLE;
} else if (bus->cmd & I2CD_RX_DMA_ENABLE) {
uint8_t data;
while (bus->dma_len) {
MemTxResult result;
data = i2c_recv(bus->bus);
trace_aspeed_i2c_bus_recv("DMA", bus->dma_len, bus->dma_len, data);
result = address_space_write(&s->dram_as, bus->dma_addr,
MEMTXATTRS_UNSPECIFIED, &data, 1);
if (result != MEMTX_OK) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: DRAM write failed @%08x\n",
__func__, bus->dma_addr);
return;
}
bus->dma_addr++;
bus->dma_len--;
}
bus->cmd &= ~I2CD_RX_DMA_ENABLE;
} else {
data = i2c_recv(bus->bus);
trace_aspeed_i2c_bus_recv("BYTE", 1, 1, bus->buf);
bus->buf = (data & I2CD_BYTE_BUF_RX_MASK) << I2CD_BYTE_BUF_RX_SHIFT;
}
}
static void aspeed_i2c_handle_rx_cmd(AspeedI2CBus *bus)
{
aspeed_i2c_set_state(bus, I2CD_MRXD);
aspeed_i2c_bus_recv(bus);
bus->intr_status |= I2CD_INTR_RX_DONE;
if (bus->cmd & I2CD_M_S_RX_CMD_LAST) {
i2c_nack(bus->bus);
}
bus->cmd &= ~(I2CD_M_RX_CMD | I2CD_M_S_RX_CMD_LAST);
aspeed_i2c_set_state(bus, I2CD_MACTIVE);
}
static uint8_t aspeed_i2c_get_addr(AspeedI2CBus *bus)
{
AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(bus->controller);
if (bus->cmd & I2CD_TX_BUFF_ENABLE) {
uint8_t *pool_base = aic->bus_pool_base(bus);
return pool_base[0];
} else if (bus->cmd & I2CD_TX_DMA_ENABLE) {
uint8_t data;
aspeed_i2c_dma_read(bus, &data);
return data;
} else {
return bus->buf;
}
}
static bool aspeed_i2c_check_sram(AspeedI2CBus *bus)
{
AspeedI2CState *s = bus->controller;
AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(s);
if (!aic->check_sram) {
return true;
}
/*
* AST2500: SRAM must be enabled before using the Buffer Pool or
* DMA mode.
*/
if (!(s->ctrl_global & I2C_CTRL_SRAM_EN) &&
(bus->cmd & (I2CD_RX_DMA_ENABLE | I2CD_TX_DMA_ENABLE |
I2CD_RX_BUFF_ENABLE | I2CD_TX_BUFF_ENABLE))) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: SRAM is not enabled\n", __func__);
return false;
}
return true;
}
static void aspeed_i2c_bus_cmd_dump(AspeedI2CBus *bus)
{
g_autofree char *cmd_flags = NULL;
uint32_t count;
if (bus->cmd & (I2CD_RX_BUFF_ENABLE | I2CD_RX_BUFF_ENABLE)) {
count = I2CD_POOL_TX_COUNT(bus->pool_ctrl);
} else if (bus->cmd & (I2CD_RX_DMA_ENABLE | I2CD_RX_DMA_ENABLE)) {
count = bus->dma_len;
} else { /* BYTE mode */
count = 1;
}
cmd_flags = g_strdup_printf("%s%s%s%s%s%s%s%s%s",
bus->cmd & I2CD_M_START_CMD ? "start|" : "",
bus->cmd & I2CD_RX_DMA_ENABLE ? "rxdma|" : "",
bus->cmd & I2CD_TX_DMA_ENABLE ? "txdma|" : "",
bus->cmd & I2CD_RX_BUFF_ENABLE ? "rxbuf|" : "",
bus->cmd & I2CD_TX_BUFF_ENABLE ? "txbuf|" : "",
bus->cmd & I2CD_M_TX_CMD ? "tx|" : "",
bus->cmd & I2CD_M_RX_CMD ? "rx|" : "",
bus->cmd & I2CD_M_S_RX_CMD_LAST ? "last|" : "",
bus->cmd & I2CD_M_STOP_CMD ? "stop" : "");
trace_aspeed_i2c_bus_cmd(bus->cmd, cmd_flags, count, bus->intr_status);
}
/*
* The state machine needs some refinement. It is only used to track
* invalid STOP commands for the moment.
*/
static void aspeed_i2c_bus_handle_cmd(AspeedI2CBus *bus, uint64_t value)
{
uint8_t pool_start = 0;
bus->cmd &= ~0xFFFF;
bus->cmd |= value & 0xFFFF;
if (!aspeed_i2c_check_sram(bus)) {
return;
}
if (trace_event_get_state_backends(TRACE_ASPEED_I2C_BUS_CMD)) {
aspeed_i2c_bus_cmd_dump(bus);
}
if (bus->cmd & I2CD_M_START_CMD) {
uint8_t state = aspeed_i2c_get_state(bus) & I2CD_MACTIVE ?
I2CD_MSTARTR : I2CD_MSTART;
uint8_t addr;
aspeed_i2c_set_state(bus, state);
addr = aspeed_i2c_get_addr(bus);
if (i2c_start_transfer(bus->bus, extract32(addr, 1, 7),
extract32(addr, 0, 1))) {
bus->intr_status |= I2CD_INTR_TX_NAK;
} else {
bus->intr_status |= I2CD_INTR_TX_ACK;
}
bus->cmd &= ~I2CD_M_START_CMD;
/*
* The START command is also a TX command, as the slave
* address is sent on the bus. Drop the TX flag if nothing
* else needs to be sent in this sequence.
*/
if (bus->cmd & I2CD_TX_BUFF_ENABLE) {
if (I2CD_POOL_TX_COUNT(bus->pool_ctrl) == 1) {
bus->cmd &= ~I2CD_M_TX_CMD;
} else {
/*
* Increase the start index in the TX pool buffer to
* skip the address byte.
*/
pool_start++;
}
} else if (bus->cmd & I2CD_TX_DMA_ENABLE) {
if (bus->dma_len == 0) {
bus->cmd &= ~I2CD_M_TX_CMD;
}
} else {
bus->cmd &= ~I2CD_M_TX_CMD;
}
/* No slave found */
if (!i2c_bus_busy(bus->bus)) {
return;
}
aspeed_i2c_set_state(bus, I2CD_MACTIVE);
}
if (bus->cmd & I2CD_M_TX_CMD) {
aspeed_i2c_set_state(bus, I2CD_MTXD);
if (aspeed_i2c_bus_send(bus, pool_start)) {
bus->intr_status |= (I2CD_INTR_TX_NAK);
i2c_end_transfer(bus->bus);
} else {
bus->intr_status |= I2CD_INTR_TX_ACK;
}
bus->cmd &= ~I2CD_M_TX_CMD;
aspeed_i2c_set_state(bus, I2CD_MACTIVE);
}
if ((bus->cmd & (I2CD_M_RX_CMD | I2CD_M_S_RX_CMD_LAST)) &&
!(bus->intr_status & I2CD_INTR_RX_DONE)) {
aspeed_i2c_handle_rx_cmd(bus);
}
if (bus->cmd & I2CD_M_STOP_CMD) {
if (!(aspeed_i2c_get_state(bus) & I2CD_MACTIVE)) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: abnormal stop\n", __func__);
bus->intr_status |= I2CD_INTR_ABNORMAL;
} else {
aspeed_i2c_set_state(bus, I2CD_MSTOP);
i2c_end_transfer(bus->bus);
bus->intr_status |= I2CD_INTR_NORMAL_STOP;
}
bus->cmd &= ~I2CD_M_STOP_CMD;
aspeed_i2c_set_state(bus, I2CD_IDLE);
}
}
static void aspeed_i2c_bus_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
AspeedI2CBus *bus = opaque;
AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(bus->controller);
bool handle_rx;
trace_aspeed_i2c_bus_write(bus->id, offset, size, value);
switch (offset) {
case I2CD_FUN_CTRL_REG:
if (value & I2CD_SLAVE_EN) {
qemu_log_mask(LOG_UNIMP, "%s: slave mode not implemented\n",
__func__);
break;
}
bus->ctrl = value & 0x0071C3FF;
break;
case I2CD_AC_TIMING_REG1:
bus->timing[0] = value & 0xFFFFF0F;
break;
case I2CD_AC_TIMING_REG2:
bus->timing[1] = value & 0x7;
break;
case I2CD_INTR_CTRL_REG:
bus->intr_ctrl = value & 0x7FFF;
break;
case I2CD_INTR_STS_REG:
handle_rx = (bus->intr_status & I2CD_INTR_RX_DONE) &&
(value & I2CD_INTR_RX_DONE);
bus->intr_status &= ~(value & 0x7FFF);
if (!bus->intr_status) {
bus->controller->intr_status &= ~(1 << bus->id);
qemu_irq_lower(aic->bus_get_irq(bus));
}
if (handle_rx && (bus->cmd & (I2CD_M_RX_CMD | I2CD_M_S_RX_CMD_LAST))) {
aspeed_i2c_handle_rx_cmd(bus);
aspeed_i2c_bus_raise_interrupt(bus);
}
break;
case I2CD_DEV_ADDR_REG:
qemu_log_mask(LOG_UNIMP, "%s: slave mode not implemented\n",
__func__);
break;
case I2CD_POOL_CTRL_REG:
bus->pool_ctrl &= ~0xffffff;
bus->pool_ctrl |= (value & 0xffffff);
break;
case I2CD_BYTE_BUF_REG:
bus->buf = (value & I2CD_BYTE_BUF_TX_MASK) << I2CD_BYTE_BUF_TX_SHIFT;
break;
case I2CD_CMD_REG:
if (!aspeed_i2c_bus_is_enabled(bus)) {
break;
}
if (!aspeed_i2c_bus_is_master(bus)) {
qemu_log_mask(LOG_UNIMP, "%s: slave mode not implemented\n",
__func__);
break;
}
if (!aic->has_dma &&
value & (I2CD_RX_DMA_ENABLE | I2CD_TX_DMA_ENABLE)) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: No DMA support\n", __func__);
break;
}
aspeed_i2c_bus_handle_cmd(bus, value);
aspeed_i2c_bus_raise_interrupt(bus);
break;
case I2CD_DMA_ADDR:
if (!aic->has_dma) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: No DMA support\n", __func__);
break;
}
bus->dma_addr = value & 0x3ffffffc;
break;
case I2CD_DMA_LEN:
if (!aic->has_dma) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: No DMA support\n", __func__);
break;
}
bus->dma_len = value & 0xfff;
if (!bus->dma_len) {
qemu_log_mask(LOG_UNIMP, "%s: invalid DMA length\n", __func__);
}
break;
default:
qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIx "\n",
__func__, offset);
}
}
static uint64_t aspeed_i2c_ctrl_read(void *opaque, hwaddr offset,
unsigned size)
{
AspeedI2CState *s = opaque;
switch (offset) {
case I2C_CTRL_STATUS:
return s->intr_status;
case I2C_CTRL_GLOBAL:
return s->ctrl_global;
default:
qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIx "\n",
__func__, offset);
break;
}
return -1;
}
static void aspeed_i2c_ctrl_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
AspeedI2CState *s = opaque;
switch (offset) {
case I2C_CTRL_GLOBAL:
s->ctrl_global = value;
break;
case I2C_CTRL_STATUS:
default:
qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIx "\n",
__func__, offset);
break;
}
}
static const MemoryRegionOps aspeed_i2c_bus_ops = {
.read = aspeed_i2c_bus_read,
.write = aspeed_i2c_bus_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static const MemoryRegionOps aspeed_i2c_ctrl_ops = {
.read = aspeed_i2c_ctrl_read,
.write = aspeed_i2c_ctrl_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static uint64_t aspeed_i2c_pool_read(void *opaque, hwaddr offset,
unsigned size)
{
AspeedI2CState *s = opaque;
uint64_t ret = 0;
int i;
for (i = 0; i < size; i++) {
ret |= (uint64_t) s->pool[offset + i] << (8 * i);
}
return ret;
}
static void aspeed_i2c_pool_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
AspeedI2CState *s = opaque;
int i;
for (i = 0; i < size; i++) {
s->pool[offset + i] = (value >> (8 * i)) & 0xFF;
}
}
static const MemoryRegionOps aspeed_i2c_pool_ops = {
.read = aspeed_i2c_pool_read,
.write = aspeed_i2c_pool_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.valid = {
.min_access_size = 1,
.max_access_size = 4,
},
};
static const VMStateDescription aspeed_i2c_bus_vmstate = {
.name = TYPE_ASPEED_I2C,
.version_id = 3,
.minimum_version_id = 3,
.fields = (VMStateField[]) {
VMSTATE_UINT8(id, AspeedI2CBus),
VMSTATE_UINT32(ctrl, AspeedI2CBus),
VMSTATE_UINT32_ARRAY(timing, AspeedI2CBus, 2),
VMSTATE_UINT32(intr_ctrl, AspeedI2CBus),
VMSTATE_UINT32(intr_status, AspeedI2CBus),
VMSTATE_UINT32(cmd, AspeedI2CBus),
VMSTATE_UINT32(buf, AspeedI2CBus),
VMSTATE_UINT32(pool_ctrl, AspeedI2CBus),
VMSTATE_UINT32(dma_addr, AspeedI2CBus),
VMSTATE_UINT32(dma_len, AspeedI2CBus),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription aspeed_i2c_vmstate = {
.name = TYPE_ASPEED_I2C,
.version_id = 2,
.minimum_version_id = 2,
.fields = (VMStateField[]) {
VMSTATE_UINT32(intr_status, AspeedI2CState),
VMSTATE_STRUCT_ARRAY(busses, AspeedI2CState,
ASPEED_I2C_NR_BUSSES, 1, aspeed_i2c_bus_vmstate,
AspeedI2CBus),
VMSTATE_UINT8_ARRAY(pool, AspeedI2CState, ASPEED_I2C_MAX_POOL_SIZE),
VMSTATE_END_OF_LIST()
}
};
static void aspeed_i2c_reset(DeviceState *dev)
{
AspeedI2CState *s = ASPEED_I2C(dev);
s->intr_status = 0;
}
static void aspeed_i2c_instance_init(Object *obj)
{
AspeedI2CState *s = ASPEED_I2C(obj);
AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(s);
int i;
for (i = 0; i < aic->num_busses; i++) {
object_initialize_child(obj, "bus[*]", &s->busses[i],
TYPE_ASPEED_I2C_BUS);
}
}
/*
* Address Definitions (AST2400 and AST2500)
*
* 0x000 ... 0x03F: Global Register
* 0x040 ... 0x07F: Device 1
* 0x080 ... 0x0BF: Device 2
* 0x0C0 ... 0x0FF: Device 3
* 0x100 ... 0x13F: Device 4
* 0x140 ... 0x17F: Device 5
* 0x180 ... 0x1BF: Device 6
* 0x1C0 ... 0x1FF: Device 7
* 0x200 ... 0x2FF: Buffer Pool (unused in linux driver)
* 0x300 ... 0x33F: Device 8
* 0x340 ... 0x37F: Device 9
* 0x380 ... 0x3BF: Device 10
* 0x3C0 ... 0x3FF: Device 11
* 0x400 ... 0x43F: Device 12
* 0x440 ... 0x47F: Device 13
* 0x480 ... 0x4BF: Device 14
* 0x800 ... 0xFFF: Buffer Pool (unused in linux driver)
*/
static void aspeed_i2c_realize(DeviceState *dev, Error **errp)
{
int i;
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
AspeedI2CState *s = ASPEED_I2C(dev);
AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(s);
sysbus_init_irq(sbd, &s->irq);
memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_i2c_ctrl_ops, s,
"aspeed.i2c", 0x1000);
sysbus_init_mmio(sbd, &s->iomem);
for (i = 0; i < aic->num_busses; i++) {
Object *bus = OBJECT(&s->busses[i]);
int offset = i < aic->gap ? 1 : 5;
if (!object_property_set_link(bus, "controller", OBJECT(s), errp)) {
return;
}
if (!object_property_set_uint(bus, "bus-id", i, errp)) {
return;
}
if (!sysbus_realize(SYS_BUS_DEVICE(bus), errp)) {
return;
}
memory_region_add_subregion(&s->iomem, aic->reg_size * (i + offset),
&s->busses[i].mr);
}
memory_region_init_io(&s->pool_iomem, OBJECT(s), &aspeed_i2c_pool_ops, s,
"aspeed.i2c-pool", aic->pool_size);
memory_region_add_subregion(&s->iomem, aic->pool_base, &s->pool_iomem);
if (aic->has_dma) {
if (!s->dram_mr) {
error_setg(errp, TYPE_ASPEED_I2C ": 'dram' link not set");
return;
}
address_space_init(&s->dram_as, s->dram_mr,
TYPE_ASPEED_I2C "-dma-dram");
}
}
static Property aspeed_i2c_properties[] = {
DEFINE_PROP_LINK("dram", AspeedI2CState, dram_mr,
TYPE_MEMORY_REGION, MemoryRegion *),
DEFINE_PROP_END_OF_LIST(),
};
static void aspeed_i2c_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->vmsd = &aspeed_i2c_vmstate;
dc->reset = aspeed_i2c_reset;
device_class_set_props(dc, aspeed_i2c_properties);
dc->realize = aspeed_i2c_realize;
dc->desc = "Aspeed I2C Controller";
}
static const TypeInfo aspeed_i2c_info = {
.name = TYPE_ASPEED_I2C,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_init = aspeed_i2c_instance_init,
.instance_size = sizeof(AspeedI2CState),
.class_init = aspeed_i2c_class_init,
.class_size = sizeof(AspeedI2CClass),
.abstract = true,
};
static void aspeed_i2c_bus_reset(DeviceState *dev)
{
AspeedI2CBus *s = ASPEED_I2C_BUS(dev);
s->intr_ctrl = 0;
s->intr_status = 0;
s->cmd = 0;
s->buf = 0;
s->dma_addr = 0;
s->dma_len = 0;
i2c_end_transfer(s->bus);
}
static void aspeed_i2c_bus_realize(DeviceState *dev, Error **errp)
{
AspeedI2CBus *s = ASPEED_I2C_BUS(dev);
AspeedI2CClass *aic;
g_autofree char *name = g_strdup_printf(TYPE_ASPEED_I2C_BUS ".%d", s->id);
if (!s->controller) {
error_setg(errp, TYPE_ASPEED_I2C_BUS ": 'controller' link not set");
return;
}
aic = ASPEED_I2C_GET_CLASS(s->controller);
sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->irq);
s->bus = i2c_init_bus(dev, name);
memory_region_init_io(&s->mr, OBJECT(s), &aspeed_i2c_bus_ops,
s, name, aic->reg_size);
sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->mr);
}
static Property aspeed_i2c_bus_properties[] = {
DEFINE_PROP_UINT8("bus-id", AspeedI2CBus, id, 0),
DEFINE_PROP_LINK("controller", AspeedI2CBus, controller, TYPE_ASPEED_I2C,
AspeedI2CState *),
DEFINE_PROP_END_OF_LIST(),
};
static void aspeed_i2c_bus_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->desc = "Aspeed I2C Bus";
dc->realize = aspeed_i2c_bus_realize;
dc->reset = aspeed_i2c_bus_reset;
device_class_set_props(dc, aspeed_i2c_bus_properties);
}
static const TypeInfo aspeed_i2c_bus_info = {
.name = TYPE_ASPEED_I2C_BUS,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(AspeedI2CBus),
.class_init = aspeed_i2c_bus_class_init,
};
static qemu_irq aspeed_2400_i2c_bus_get_irq(AspeedI2CBus *bus)
{
return bus->controller->irq;
}
static uint8_t *aspeed_2400_i2c_bus_pool_base(AspeedI2CBus *bus)
{
uint8_t *pool_page =
&bus->controller->pool[I2CD_POOL_PAGE_SEL(bus->ctrl) * 0x100];
return &pool_page[I2CD_POOL_OFFSET(bus->pool_ctrl)];
}
static void aspeed_2400_i2c_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
AspeedI2CClass *aic = ASPEED_I2C_CLASS(klass);
dc->desc = "ASPEED 2400 I2C Controller";
aic->num_busses = 14;
aic->reg_size = 0x40;
aic->gap = 7;
aic->bus_get_irq = aspeed_2400_i2c_bus_get_irq;
aic->pool_size = 0x800;
aic->pool_base = 0x800;
aic->bus_pool_base = aspeed_2400_i2c_bus_pool_base;
}
static const TypeInfo aspeed_2400_i2c_info = {
.name = TYPE_ASPEED_2400_I2C,
.parent = TYPE_ASPEED_I2C,
.class_init = aspeed_2400_i2c_class_init,
};
static qemu_irq aspeed_2500_i2c_bus_get_irq(AspeedI2CBus *bus)
{
return bus->controller->irq;
}
static uint8_t *aspeed_2500_i2c_bus_pool_base(AspeedI2CBus *bus)
{
return &bus->controller->pool[bus->id * 0x10];
}
static void aspeed_2500_i2c_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
AspeedI2CClass *aic = ASPEED_I2C_CLASS(klass);
dc->desc = "ASPEED 2500 I2C Controller";
aic->num_busses = 14;
aic->reg_size = 0x40;
aic->gap = 7;
aic->bus_get_irq = aspeed_2500_i2c_bus_get_irq;
aic->pool_size = 0x100;
aic->pool_base = 0x200;
aic->bus_pool_base = aspeed_2500_i2c_bus_pool_base;
aic->check_sram = true;
aic->has_dma = true;
}
static const TypeInfo aspeed_2500_i2c_info = {
.name = TYPE_ASPEED_2500_I2C,
.parent = TYPE_ASPEED_I2C,
.class_init = aspeed_2500_i2c_class_init,
};
static qemu_irq aspeed_2600_i2c_bus_get_irq(AspeedI2CBus *bus)
{
return bus->irq;
}
static uint8_t *aspeed_2600_i2c_bus_pool_base(AspeedI2CBus *bus)
{
return &bus->controller->pool[bus->id * 0x20];
}
static void aspeed_2600_i2c_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
AspeedI2CClass *aic = ASPEED_I2C_CLASS(klass);
dc->desc = "ASPEED 2600 I2C Controller";
aic->num_busses = 16;
aic->reg_size = 0x80;
aic->gap = -1; /* no gap */
aic->bus_get_irq = aspeed_2600_i2c_bus_get_irq;
aic->pool_size = 0x200;
aic->pool_base = 0xC00;
aic->bus_pool_base = aspeed_2600_i2c_bus_pool_base;
aic->has_dma = true;
}
static const TypeInfo aspeed_2600_i2c_info = {
.name = TYPE_ASPEED_2600_I2C,
.parent = TYPE_ASPEED_I2C,
.class_init = aspeed_2600_i2c_class_init,
};
static void aspeed_i2c_register_types(void)
{
type_register_static(&aspeed_i2c_bus_info);
type_register_static(&aspeed_i2c_info);
type_register_static(&aspeed_2400_i2c_info);
type_register_static(&aspeed_2500_i2c_info);
type_register_static(&aspeed_2600_i2c_info);
}
type_init(aspeed_i2c_register_types)
I2CBus *aspeed_i2c_get_bus(AspeedI2CState *s, int busnr)
{
AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(s);
I2CBus *bus = NULL;
if (busnr >= 0 && busnr < aic->num_busses) {
bus = s->busses[busnr].bus;
}
return bus;
}
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