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qemu/hw/i2c/aspeed_i2c.c
Cédric Le Goater 3f7a53b224 aspeed/i2c: Rename DMA address space 
It improves 'info mtree' output.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20210407171637.777743-5-clg@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
2021-05-01 10:03:51 +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)
{
int i;
AspeedI2CState *s = ASPEED_I2C(dev);
AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(s);
s->intr_status = 0;
for (i = 0; i < aic->num_busses; i++) {
s->busses[i].intr_ctrl = 0;
s->busses[i].intr_status = 0;
s->busses[i].cmd = 0;
s->busses[i].buf = 0;
s->busses[i].dma_addr = 0;
s->busses[i].dma_len = 0;
i2c_end_transfer(s->busses[i].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++) {
char name[32];
int offset = i < aic->gap ? 1 : 5;
sysbus_init_irq(sbd, &s->busses[i].irq);
snprintf(name, sizeof(name), "aspeed.i2c.%d", i);
s->busses[i].controller = s;
s->busses[i].id = i;
s->busses[i].bus = i2c_init_bus(dev, name);
memory_region_init_io(&s->busses[i].mr, OBJECT(dev),
&aspeed_i2c_bus_ops, &s->busses[i], name,
aic->reg_size);
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_size = sizeof(AspeedI2CState),
.class_init = aspeed_i2c_class_init,
.class_size = sizeof(AspeedI2CClass),
.abstract = true,
};
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_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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