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qemu-e2k/hw/i2c/npcm7xx_smbus.c
Philippe Mathieu-Daudé 5dfbfefaad hw/i2c/npcm7xx_smbus: Simplify npcm7xx_smbus_init() 
The STATUS register will be reset to IDLE in
cnpcm7xx_smbus_enter_reset(), no need to preset
it in instance_init().

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Hao Wu <wuhaotsh@google.com>
Message-id: 20210228224813.312532-1-f4bug@amsat.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-03-05 15:17:34 +00:00

1099 lines
32 KiB
C
Raw Blame History

/*
* Nuvoton NPCM7xx SMBus Module.
*
* Copyright 2020 Google LLC
*
* 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.
*/
#include "qemu/osdep.h"
#include "hw/i2c/npcm7xx_smbus.h"
#include "migration/vmstate.h"
#include "qemu/bitops.h"
#include "qemu/guest-random.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "qemu/units.h"
#include "trace.h"
enum NPCM7xxSMBusCommonRegister {
NPCM7XX_SMB_SDA = 0x0,
NPCM7XX_SMB_ST = 0x2,
NPCM7XX_SMB_CST = 0x4,
NPCM7XX_SMB_CTL1 = 0x6,
NPCM7XX_SMB_ADDR1 = 0x8,
NPCM7XX_SMB_CTL2 = 0xa,
NPCM7XX_SMB_ADDR2 = 0xc,
NPCM7XX_SMB_CTL3 = 0xe,
NPCM7XX_SMB_CST2 = 0x18,
NPCM7XX_SMB_CST3 = 0x19,
NPCM7XX_SMB_VER = 0x1f,
};
enum NPCM7xxSMBusBank0Register {
NPCM7XX_SMB_ADDR3 = 0x10,
NPCM7XX_SMB_ADDR7 = 0x11,
NPCM7XX_SMB_ADDR4 = 0x12,
NPCM7XX_SMB_ADDR8 = 0x13,
NPCM7XX_SMB_ADDR5 = 0x14,
NPCM7XX_SMB_ADDR9 = 0x15,
NPCM7XX_SMB_ADDR6 = 0x16,
NPCM7XX_SMB_ADDR10 = 0x17,
NPCM7XX_SMB_CTL4 = 0x1a,
NPCM7XX_SMB_CTL5 = 0x1b,
NPCM7XX_SMB_SCLLT = 0x1c,
NPCM7XX_SMB_FIF_CTL = 0x1d,
NPCM7XX_SMB_SCLHT = 0x1e,
};
enum NPCM7xxSMBusBank1Register {
NPCM7XX_SMB_FIF_CTS = 0x10,
NPCM7XX_SMB_FAIR_PER = 0x11,
NPCM7XX_SMB_TXF_CTL = 0x12,
NPCM7XX_SMB_T_OUT = 0x14,
NPCM7XX_SMB_TXF_STS = 0x1a,
NPCM7XX_SMB_RXF_STS = 0x1c,
NPCM7XX_SMB_RXF_CTL = 0x1e,
};
/* ST fields */
#define NPCM7XX_SMBST_STP BIT(7)
#define NPCM7XX_SMBST_SDAST BIT(6)
#define NPCM7XX_SMBST_BER BIT(5)
#define NPCM7XX_SMBST_NEGACK BIT(4)
#define NPCM7XX_SMBST_STASTR BIT(3)
#define NPCM7XX_SMBST_NMATCH BIT(2)
#define NPCM7XX_SMBST_MODE BIT(1)
#define NPCM7XX_SMBST_XMIT BIT(0)
/* CST fields */
#define NPCM7XX_SMBCST_ARPMATCH BIT(7)
#define NPCM7XX_SMBCST_MATCHAF BIT(6)
#define NPCM7XX_SMBCST_TGSCL BIT(5)
#define NPCM7XX_SMBCST_TSDA BIT(4)
#define NPCM7XX_SMBCST_GCMATCH BIT(3)
#define NPCM7XX_SMBCST_MATCH BIT(2)
#define NPCM7XX_SMBCST_BB BIT(1)
#define NPCM7XX_SMBCST_BUSY BIT(0)
/* CST2 fields */
#define NPCM7XX_SMBCST2_INTSTS BIT(7)
#define NPCM7XX_SMBCST2_MATCH7F BIT(6)
#define NPCM7XX_SMBCST2_MATCH6F BIT(5)
#define NPCM7XX_SMBCST2_MATCH5F BIT(4)
#define NPCM7XX_SMBCST2_MATCH4F BIT(3)
#define NPCM7XX_SMBCST2_MATCH3F BIT(2)
#define NPCM7XX_SMBCST2_MATCH2F BIT(1)
#define NPCM7XX_SMBCST2_MATCH1F BIT(0)
/* CST3 fields */
#define NPCM7XX_SMBCST3_EO_BUSY BIT(7)
#define NPCM7XX_SMBCST3_MATCH10F BIT(2)
#define NPCM7XX_SMBCST3_MATCH9F BIT(1)
#define NPCM7XX_SMBCST3_MATCH8F BIT(0)
/* CTL1 fields */
#define NPCM7XX_SMBCTL1_STASTRE BIT(7)
#define NPCM7XX_SMBCTL1_NMINTE BIT(6)
#define NPCM7XX_SMBCTL1_GCMEN BIT(5)
#define NPCM7XX_SMBCTL1_ACK BIT(4)
#define NPCM7XX_SMBCTL1_EOBINTE BIT(3)
#define NPCM7XX_SMBCTL1_INTEN BIT(2)
#define NPCM7XX_SMBCTL1_STOP BIT(1)
#define NPCM7XX_SMBCTL1_START BIT(0)
/* CTL2 fields */
#define NPCM7XX_SMBCTL2_SCLFRQ(rv) extract8((rv), 1, 6)
#define NPCM7XX_SMBCTL2_ENABLE BIT(0)
/* CTL3 fields */
#define NPCM7XX_SMBCTL3_SCL_LVL BIT(7)
#define NPCM7XX_SMBCTL3_SDA_LVL BIT(6)
#define NPCM7XX_SMBCTL3_BNK_SEL BIT(5)
#define NPCM7XX_SMBCTL3_400K_MODE BIT(4)
#define NPCM7XX_SMBCTL3_IDL_START BIT(3)
#define NPCM7XX_SMBCTL3_ARPMEN BIT(2)
#define NPCM7XX_SMBCTL3_SCLFRQ(rv) extract8((rv), 0, 2)
/* ADDR fields */
#define NPCM7XX_ADDR_EN BIT(7)
#define NPCM7XX_ADDR_A(rv) extract8((rv), 0, 6)
/* FIFO Mode Register Fields */
/* FIF_CTL fields */
#define NPCM7XX_SMBFIF_CTL_FIFO_EN BIT(4)
#define NPCM7XX_SMBFIF_CTL_FAIR_RDY_IE BIT(2)
#define NPCM7XX_SMBFIF_CTL_FAIR_RDY BIT(1)
#define NPCM7XX_SMBFIF_CTL_FAIR_BUSY BIT(0)
/* FIF_CTS fields */
#define NPCM7XX_SMBFIF_CTS_STR BIT(7)
#define NPCM7XX_SMBFIF_CTS_CLR_FIFO BIT(6)
#define NPCM7XX_SMBFIF_CTS_RFTE_IE BIT(3)
#define NPCM7XX_SMBFIF_CTS_RXF_TXE BIT(1)
/* TXF_CTL fields */
#define NPCM7XX_SMBTXF_CTL_THR_TXIE BIT(6)
#define NPCM7XX_SMBTXF_CTL_TX_THR(rv) extract8((rv), 0, 5)
/* T_OUT fields */
#define NPCM7XX_SMBT_OUT_ST BIT(7)
#define NPCM7XX_SMBT_OUT_IE BIT(6)
#define NPCM7XX_SMBT_OUT_CLKDIV(rv) extract8((rv), 0, 6)
/* TXF_STS fields */
#define NPCM7XX_SMBTXF_STS_TX_THST BIT(6)
#define NPCM7XX_SMBTXF_STS_TX_BYTES(rv) extract8((rv), 0, 5)
/* RXF_STS fields */
#define NPCM7XX_SMBRXF_STS_RX_THST BIT(6)
#define NPCM7XX_SMBRXF_STS_RX_BYTES(rv) extract8((rv), 0, 5)
/* RXF_CTL fields */
#define NPCM7XX_SMBRXF_CTL_THR_RXIE BIT(6)
#define NPCM7XX_SMBRXF_CTL_LAST BIT(5)
#define NPCM7XX_SMBRXF_CTL_RX_THR(rv) extract8((rv), 0, 5)
#define KEEP_OLD_BIT(o, n, b) (((n) & (~(b))) | ((o) & (b)))
#define WRITE_ONE_CLEAR(o, n, b) ((n) & (b) ? (o) & (~(b)) : (o))
#define NPCM7XX_SMBUS_ENABLED(s) ((s)->ctl2 & NPCM7XX_SMBCTL2_ENABLE)
#define NPCM7XX_SMBUS_FIFO_ENABLED(s) ((s)->fif_ctl & \
NPCM7XX_SMBFIF_CTL_FIFO_EN)
/* VERSION fields values, read-only. */
#define NPCM7XX_SMBUS_VERSION_NUMBER 1
#define NPCM7XX_SMBUS_VERSION_FIFO_SUPPORTED 1
/* Reset values */
#define NPCM7XX_SMB_ST_INIT_VAL 0x00
#define NPCM7XX_SMB_CST_INIT_VAL 0x10
#define NPCM7XX_SMB_CST2_INIT_VAL 0x00
#define NPCM7XX_SMB_CST3_INIT_VAL 0x00
#define NPCM7XX_SMB_CTL1_INIT_VAL 0x00
#define NPCM7XX_SMB_CTL2_INIT_VAL 0x00
#define NPCM7XX_SMB_CTL3_INIT_VAL 0xc0
#define NPCM7XX_SMB_CTL4_INIT_VAL 0x07
#define NPCM7XX_SMB_CTL5_INIT_VAL 0x00
#define NPCM7XX_SMB_ADDR_INIT_VAL 0x00
#define NPCM7XX_SMB_SCLLT_INIT_VAL 0x00
#define NPCM7XX_SMB_SCLHT_INIT_VAL 0x00
#define NPCM7XX_SMB_FIF_CTL_INIT_VAL 0x00
#define NPCM7XX_SMB_FIF_CTS_INIT_VAL 0x00
#define NPCM7XX_SMB_FAIR_PER_INIT_VAL 0x00
#define NPCM7XX_SMB_TXF_CTL_INIT_VAL 0x00
#define NPCM7XX_SMB_T_OUT_INIT_VAL 0x3f
#define NPCM7XX_SMB_TXF_STS_INIT_VAL 0x00
#define NPCM7XX_SMB_RXF_STS_INIT_VAL 0x00
#define NPCM7XX_SMB_RXF_CTL_INIT_VAL 0x01
static uint8_t npcm7xx_smbus_get_version(void)
{
return NPCM7XX_SMBUS_VERSION_FIFO_SUPPORTED << 7 |
NPCM7XX_SMBUS_VERSION_NUMBER;
}
static void npcm7xx_smbus_update_irq(NPCM7xxSMBusState *s)
{
int level;
if (s->ctl1 & NPCM7XX_SMBCTL1_INTEN) {
level = !!((s->ctl1 & NPCM7XX_SMBCTL1_NMINTE &&
s->st & NPCM7XX_SMBST_NMATCH) ||
(s->st & NPCM7XX_SMBST_BER) ||
(s->st & NPCM7XX_SMBST_NEGACK) ||
(s->st & NPCM7XX_SMBST_SDAST) ||
(s->ctl1 & NPCM7XX_SMBCTL1_STASTRE &&
s->st & NPCM7XX_SMBST_SDAST) ||
(s->ctl1 & NPCM7XX_SMBCTL1_EOBINTE &&
s->cst3 & NPCM7XX_SMBCST3_EO_BUSY) ||
(s->rxf_ctl & NPCM7XX_SMBRXF_CTL_THR_RXIE &&
s->rxf_sts & NPCM7XX_SMBRXF_STS_RX_THST) ||
(s->txf_ctl & NPCM7XX_SMBTXF_CTL_THR_TXIE &&
s->txf_sts & NPCM7XX_SMBTXF_STS_TX_THST) ||
(s->fif_cts & NPCM7XX_SMBFIF_CTS_RFTE_IE &&
s->fif_cts & NPCM7XX_SMBFIF_CTS_RXF_TXE));
if (level) {
s->cst2 |= NPCM7XX_SMBCST2_INTSTS;
} else {
s->cst2 &= ~NPCM7XX_SMBCST2_INTSTS;
}
qemu_set_irq(s->irq, level);
}
}
static void npcm7xx_smbus_nack(NPCM7xxSMBusState *s)
{
s->st &= ~NPCM7XX_SMBST_SDAST;
s->st |= NPCM7XX_SMBST_NEGACK;
s->status = NPCM7XX_SMBUS_STATUS_NEGACK;
}
static void npcm7xx_smbus_clear_buffer(NPCM7xxSMBusState *s)
{
s->fif_cts &= ~NPCM7XX_SMBFIF_CTS_RXF_TXE;
s->txf_sts = 0;
s->rxf_sts = 0;
}
static void npcm7xx_smbus_send_byte(NPCM7xxSMBusState *s, uint8_t value)
{
int rv = i2c_send(s->bus, value);
if (rv) {
npcm7xx_smbus_nack(s);
} else {
s->st |= NPCM7XX_SMBST_SDAST;
if (NPCM7XX_SMBUS_FIFO_ENABLED(s)) {
s->fif_cts |= NPCM7XX_SMBFIF_CTS_RXF_TXE;
if (NPCM7XX_SMBTXF_STS_TX_BYTES(s->txf_sts) ==
NPCM7XX_SMBTXF_CTL_TX_THR(s->txf_ctl)) {
s->txf_sts = NPCM7XX_SMBTXF_STS_TX_THST;
} else {
s->txf_sts = 0;
}
}
}
trace_npcm7xx_smbus_send_byte((DEVICE(s)->canonical_path), value, !rv);
npcm7xx_smbus_update_irq(s);
}
static void npcm7xx_smbus_recv_byte(NPCM7xxSMBusState *s)
{
s->sda = i2c_recv(s->bus);
s->st |= NPCM7XX_SMBST_SDAST;
if (s->st & NPCM7XX_SMBCTL1_ACK) {
trace_npcm7xx_smbus_nack(DEVICE(s)->canonical_path);
i2c_nack(s->bus);
s->st &= NPCM7XX_SMBCTL1_ACK;
}
trace_npcm7xx_smbus_recv_byte((DEVICE(s)->canonical_path), s->sda);
npcm7xx_smbus_update_irq(s);
}
static void npcm7xx_smbus_recv_fifo(NPCM7xxSMBusState *s)
{
uint8_t expected_bytes = NPCM7XX_SMBRXF_CTL_RX_THR(s->rxf_ctl);
uint8_t received_bytes = NPCM7XX_SMBRXF_STS_RX_BYTES(s->rxf_sts);
uint8_t pos;
if (received_bytes == expected_bytes) {
return;
}
while (received_bytes < expected_bytes &&
received_bytes < NPCM7XX_SMBUS_FIFO_SIZE) {
pos = (s->rx_cur + received_bytes) % NPCM7XX_SMBUS_FIFO_SIZE;
s->rx_fifo[pos] = i2c_recv(s->bus);
trace_npcm7xx_smbus_recv_byte((DEVICE(s)->canonical_path),
s->rx_fifo[pos]);
++received_bytes;
}
trace_npcm7xx_smbus_recv_fifo((DEVICE(s)->canonical_path),
received_bytes, expected_bytes);
s->rxf_sts = received_bytes;
if (unlikely(received_bytes < expected_bytes)) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: invalid rx_thr value: 0x%02x\n",
DEVICE(s)->canonical_path, expected_bytes);
return;
}
s->rxf_sts |= NPCM7XX_SMBRXF_STS_RX_THST;
if (s->rxf_ctl & NPCM7XX_SMBRXF_CTL_LAST) {
trace_npcm7xx_smbus_nack(DEVICE(s)->canonical_path);
i2c_nack(s->bus);
s->rxf_ctl &= ~NPCM7XX_SMBRXF_CTL_LAST;
}
if (received_bytes == NPCM7XX_SMBUS_FIFO_SIZE) {
s->st |= NPCM7XX_SMBST_SDAST;
s->fif_cts |= NPCM7XX_SMBFIF_CTS_RXF_TXE;
} else if (!(s->rxf_ctl & NPCM7XX_SMBRXF_CTL_THR_RXIE)) {
s->st |= NPCM7XX_SMBST_SDAST;
} else {
s->st &= ~NPCM7XX_SMBST_SDAST;
}
npcm7xx_smbus_update_irq(s);
}
static void npcm7xx_smbus_read_byte_fifo(NPCM7xxSMBusState *s)
{
uint8_t received_bytes = NPCM7XX_SMBRXF_STS_RX_BYTES(s->rxf_sts);
if (received_bytes == 0) {
npcm7xx_smbus_recv_fifo(s);
return;
}
s->sda = s->rx_fifo[s->rx_cur];
s->rx_cur = (s->rx_cur + 1u) % NPCM7XX_SMBUS_FIFO_SIZE;
--s->rxf_sts;
npcm7xx_smbus_update_irq(s);
}
static void npcm7xx_smbus_start(NPCM7xxSMBusState *s)
{
/*
* We can start the bus if one of these is true:
* 1. The bus is idle (so we can request it)
* 2. We are the occupier (it's a repeated start condition.)
*/
int available = !i2c_bus_busy(s->bus) ||
s->status != NPCM7XX_SMBUS_STATUS_IDLE;
if (available) {
s->st |= NPCM7XX_SMBST_MODE | NPCM7XX_SMBST_XMIT | NPCM7XX_SMBST_SDAST;
s->cst |= NPCM7XX_SMBCST_BUSY;
if (NPCM7XX_SMBUS_FIFO_ENABLED(s)) {
s->fif_cts |= NPCM7XX_SMBFIF_CTS_RXF_TXE;
}
} else {
s->st &= ~NPCM7XX_SMBST_MODE;
s->cst &= ~NPCM7XX_SMBCST_BUSY;
s->st |= NPCM7XX_SMBST_BER;
}
trace_npcm7xx_smbus_start(DEVICE(s)->canonical_path, available);
s->cst |= NPCM7XX_SMBCST_BB;
s->status = NPCM7XX_SMBUS_STATUS_IDLE;
npcm7xx_smbus_update_irq(s);
}
static void npcm7xx_smbus_send_address(NPCM7xxSMBusState *s, uint8_t value)
{
int recv;
int rv;
recv = value & BIT(0);
rv = i2c_start_transfer(s->bus, value >> 1, recv);
trace_npcm7xx_smbus_send_address(DEVICE(s)->canonical_path,
value >> 1, recv, !rv);
if (rv) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: requesting i2c bus for 0x%02x failed: %d\n",
DEVICE(s)->canonical_path, value, rv);
/* Failed to start transfer. NACK to reject.*/
if (recv) {
s->st &= ~NPCM7XX_SMBST_XMIT;
} else {
s->st |= NPCM7XX_SMBST_XMIT;
}
npcm7xx_smbus_nack(s);
npcm7xx_smbus_update_irq(s);
return;
}
s->st &= ~NPCM7XX_SMBST_NEGACK;
if (recv) {
s->status = NPCM7XX_SMBUS_STATUS_RECEIVING;
s->st &= ~NPCM7XX_SMBST_XMIT;
} else {
s->status = NPCM7XX_SMBUS_STATUS_SENDING;
s->st |= NPCM7XX_SMBST_XMIT;
}
if (s->ctl1 & NPCM7XX_SMBCTL1_STASTRE) {
s->st |= NPCM7XX_SMBST_STASTR;
if (!recv) {
s->st |= NPCM7XX_SMBST_SDAST;
}
} else if (recv) {
s->st |= NPCM7XX_SMBST_SDAST;
if (NPCM7XX_SMBUS_FIFO_ENABLED(s)) {
npcm7xx_smbus_recv_fifo(s);
} else {
npcm7xx_smbus_recv_byte(s);
}
} else if (NPCM7XX_SMBUS_FIFO_ENABLED(s)) {
s->st |= NPCM7XX_SMBST_SDAST;
s->fif_cts |= NPCM7XX_SMBFIF_CTS_RXF_TXE;
}
npcm7xx_smbus_update_irq(s);
}
static void npcm7xx_smbus_execute_stop(NPCM7xxSMBusState *s)
{
i2c_end_transfer(s->bus);
s->st = 0;
s->cst = 0;
s->status = NPCM7XX_SMBUS_STATUS_IDLE;
s->cst3 |= NPCM7XX_SMBCST3_EO_BUSY;
trace_npcm7xx_smbus_stop(DEVICE(s)->canonical_path);
npcm7xx_smbus_update_irq(s);
}
static void npcm7xx_smbus_stop(NPCM7xxSMBusState *s)
{
if (s->st & NPCM7XX_SMBST_MODE) {
switch (s->status) {
case NPCM7XX_SMBUS_STATUS_RECEIVING:
case NPCM7XX_SMBUS_STATUS_STOPPING_LAST_RECEIVE:
s->status = NPCM7XX_SMBUS_STATUS_STOPPING_LAST_RECEIVE;
break;
case NPCM7XX_SMBUS_STATUS_NEGACK:
s->status = NPCM7XX_SMBUS_STATUS_STOPPING_NEGACK;
break;
default:
npcm7xx_smbus_execute_stop(s);
break;
}
}
}
static uint8_t npcm7xx_smbus_read_sda(NPCM7xxSMBusState *s)
{
uint8_t value = s->sda;
switch (s->status) {
case NPCM7XX_SMBUS_STATUS_STOPPING_LAST_RECEIVE:
if (NPCM7XX_SMBUS_FIFO_ENABLED(s)) {
if (NPCM7XX_SMBRXF_STS_RX_BYTES(s->rxf_sts) <= 1) {
npcm7xx_smbus_execute_stop(s);
}
if (NPCM7XX_SMBRXF_STS_RX_BYTES(s->rxf_sts) == 0) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: read to SDA with an empty rx-fifo buffer, "
"result undefined: %u\n",
DEVICE(s)->canonical_path, s->sda);
break;
}
npcm7xx_smbus_read_byte_fifo(s);
value = s->sda;
} else {
npcm7xx_smbus_execute_stop(s);
}
break;
case NPCM7XX_SMBUS_STATUS_RECEIVING:
if (NPCM7XX_SMBUS_FIFO_ENABLED(s)) {
npcm7xx_smbus_read_byte_fifo(s);
value = s->sda;
} else {
npcm7xx_smbus_recv_byte(s);
}
break;
default:
/* Do nothing */
break;
}
return value;
}
static void npcm7xx_smbus_write_sda(NPCM7xxSMBusState *s, uint8_t value)
{
s->sda = value;
if (s->st & NPCM7XX_SMBST_MODE) {
switch (s->status) {
case NPCM7XX_SMBUS_STATUS_IDLE:
npcm7xx_smbus_send_address(s, value);
break;
case NPCM7XX_SMBUS_STATUS_SENDING:
npcm7xx_smbus_send_byte(s, value);
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: write to SDA in invalid status %d: %u\n",
DEVICE(s)->canonical_path, s->status, value);
break;
}
}
}
static void npcm7xx_smbus_write_st(NPCM7xxSMBusState *s, uint8_t value)
{
s->st = WRITE_ONE_CLEAR(s->st, value, NPCM7XX_SMBST_STP);
s->st = WRITE_ONE_CLEAR(s->st, value, NPCM7XX_SMBST_BER);
s->st = WRITE_ONE_CLEAR(s->st, value, NPCM7XX_SMBST_STASTR);
s->st = WRITE_ONE_CLEAR(s->st, value, NPCM7XX_SMBST_NMATCH);
if (value & NPCM7XX_SMBST_NEGACK) {
s->st &= ~NPCM7XX_SMBST_NEGACK;
if (s->status == NPCM7XX_SMBUS_STATUS_STOPPING_NEGACK) {
npcm7xx_smbus_execute_stop(s);
}
}
if (value & NPCM7XX_SMBST_STASTR &&
s->status == NPCM7XX_SMBUS_STATUS_RECEIVING) {
if (NPCM7XX_SMBUS_FIFO_ENABLED(s)) {
npcm7xx_smbus_recv_fifo(s);
} else {
npcm7xx_smbus_recv_byte(s);
}
}
npcm7xx_smbus_update_irq(s);
}
static void npcm7xx_smbus_write_cst(NPCM7xxSMBusState *s, uint8_t value)
{
uint8_t new_value = s->cst;
s->cst = WRITE_ONE_CLEAR(new_value, value, NPCM7XX_SMBCST_BB);
npcm7xx_smbus_update_irq(s);
}
static void npcm7xx_smbus_write_cst3(NPCM7xxSMBusState *s, uint8_t value)
{
s->cst3 = WRITE_ONE_CLEAR(s->cst3, value, NPCM7XX_SMBCST3_EO_BUSY);
npcm7xx_smbus_update_irq(s);
}
static void npcm7xx_smbus_write_ctl1(NPCM7xxSMBusState *s, uint8_t value)
{
s->ctl1 = KEEP_OLD_BIT(s->ctl1, value,
NPCM7XX_SMBCTL1_START | NPCM7XX_SMBCTL1_STOP | NPCM7XX_SMBCTL1_ACK);
if (value & NPCM7XX_SMBCTL1_START) {
npcm7xx_smbus_start(s);
}
if (value & NPCM7XX_SMBCTL1_STOP) {
npcm7xx_smbus_stop(s);
}
npcm7xx_smbus_update_irq(s);
}
static void npcm7xx_smbus_write_ctl2(NPCM7xxSMBusState *s, uint8_t value)
{
s->ctl2 = value;
if (!NPCM7XX_SMBUS_ENABLED(s)) {
/* Disable this SMBus module. */
s->ctl1 = 0;
s->st = 0;
s->cst3 = s->cst3 & (~NPCM7XX_SMBCST3_EO_BUSY);
s->cst = 0;
npcm7xx_smbus_clear_buffer(s);
}
}
static void npcm7xx_smbus_write_ctl3(NPCM7xxSMBusState *s, uint8_t value)
{
uint8_t old_ctl3 = s->ctl3;
/* Write to SDA and SCL bits are ignored. */
s->ctl3 = KEEP_OLD_BIT(old_ctl3, value,
NPCM7XX_SMBCTL3_SCL_LVL | NPCM7XX_SMBCTL3_SDA_LVL);
}
static void npcm7xx_smbus_write_fif_ctl(NPCM7xxSMBusState *s, uint8_t value)
{
uint8_t new_ctl = value;
new_ctl = KEEP_OLD_BIT(s->fif_ctl, new_ctl, NPCM7XX_SMBFIF_CTL_FAIR_RDY);
new_ctl = WRITE_ONE_CLEAR(new_ctl, value, NPCM7XX_SMBFIF_CTL_FAIR_RDY);
new_ctl = KEEP_OLD_BIT(s->fif_ctl, new_ctl, NPCM7XX_SMBFIF_CTL_FAIR_BUSY);
s->fif_ctl = new_ctl;
}
static void npcm7xx_smbus_write_fif_cts(NPCM7xxSMBusState *s, uint8_t value)
{
s->fif_cts = WRITE_ONE_CLEAR(s->fif_cts, value, NPCM7XX_SMBFIF_CTS_STR);
s->fif_cts = WRITE_ONE_CLEAR(s->fif_cts, value, NPCM7XX_SMBFIF_CTS_RXF_TXE);
s->fif_cts = KEEP_OLD_BIT(value, s->fif_cts, NPCM7XX_SMBFIF_CTS_RFTE_IE);
if (value & NPCM7XX_SMBFIF_CTS_CLR_FIFO) {
npcm7xx_smbus_clear_buffer(s);
}
}
static void npcm7xx_smbus_write_txf_ctl(NPCM7xxSMBusState *s, uint8_t value)
{
s->txf_ctl = value;
}
static void npcm7xx_smbus_write_t_out(NPCM7xxSMBusState *s, uint8_t value)
{
uint8_t new_t_out = value;
if ((value & NPCM7XX_SMBT_OUT_ST) || (!(s->t_out & NPCM7XX_SMBT_OUT_ST))) {
new_t_out &= ~NPCM7XX_SMBT_OUT_ST;
} else {
new_t_out |= NPCM7XX_SMBT_OUT_ST;
}
s->t_out = new_t_out;
}
static void npcm7xx_smbus_write_txf_sts(NPCM7xxSMBusState *s, uint8_t value)
{
s->txf_sts = WRITE_ONE_CLEAR(s->txf_sts, value, NPCM7XX_SMBTXF_STS_TX_THST);
}
static void npcm7xx_smbus_write_rxf_sts(NPCM7xxSMBusState *s, uint8_t value)
{
if (value & NPCM7XX_SMBRXF_STS_RX_THST) {
s->rxf_sts &= ~NPCM7XX_SMBRXF_STS_RX_THST;
if (s->status == NPCM7XX_SMBUS_STATUS_RECEIVING) {
npcm7xx_smbus_recv_fifo(s);
}
}
}
static void npcm7xx_smbus_write_rxf_ctl(NPCM7xxSMBusState *s, uint8_t value)
{
uint8_t new_ctl = value;
if (!(value & NPCM7XX_SMBRXF_CTL_LAST)) {
new_ctl = KEEP_OLD_BIT(s->rxf_ctl, new_ctl, NPCM7XX_SMBRXF_CTL_LAST);
}
s->rxf_ctl = new_ctl;
}
static uint64_t npcm7xx_smbus_read(void *opaque, hwaddr offset, unsigned size)
{
NPCM7xxSMBusState *s = opaque;
uint64_t value = 0;
uint8_t bank = s->ctl3 & NPCM7XX_SMBCTL3_BNK_SEL;
/* The order of the registers are their order in memory. */
switch (offset) {
case NPCM7XX_SMB_SDA:
value = npcm7xx_smbus_read_sda(s);
break;
case NPCM7XX_SMB_ST:
value = s->st;
break;
case NPCM7XX_SMB_CST:
value = s->cst;
break;
case NPCM7XX_SMB_CTL1:
value = s->ctl1;
break;
case NPCM7XX_SMB_ADDR1:
value = s->addr[0];
break;
case NPCM7XX_SMB_CTL2:
value = s->ctl2;
break;
case NPCM7XX_SMB_ADDR2:
value = s->addr[1];
break;
case NPCM7XX_SMB_CTL3:
value = s->ctl3;
break;
case NPCM7XX_SMB_CST2:
value = s->cst2;
break;
case NPCM7XX_SMB_CST3:
value = s->cst3;
break;
case NPCM7XX_SMB_VER:
value = npcm7xx_smbus_get_version();
break;
/* This register is either invalid or banked at this point. */
default:
if (bank) {
/* Bank 1 */
switch (offset) {
case NPCM7XX_SMB_FIF_CTS:
value = s->fif_cts;
break;
case NPCM7XX_SMB_FAIR_PER:
value = s->fair_per;
break;
case NPCM7XX_SMB_TXF_CTL:
value = s->txf_ctl;
break;
case NPCM7XX_SMB_T_OUT:
value = s->t_out;
break;
case NPCM7XX_SMB_TXF_STS:
value = s->txf_sts;
break;
case NPCM7XX_SMB_RXF_STS:
value = s->rxf_sts;
break;
case NPCM7XX_SMB_RXF_CTL:
value = s->rxf_ctl;
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: read from invalid offset 0x%" HWADDR_PRIx "\n",
DEVICE(s)->canonical_path, offset);
break;
}
} else {
/* Bank 0 */
switch (offset) {
case NPCM7XX_SMB_ADDR3:
value = s->addr[2];
break;
case NPCM7XX_SMB_ADDR7:
value = s->addr[6];
break;
case NPCM7XX_SMB_ADDR4:
value = s->addr[3];
break;
case NPCM7XX_SMB_ADDR8:
value = s->addr[7];
break;
case NPCM7XX_SMB_ADDR5:
value = s->addr[4];
break;
case NPCM7XX_SMB_ADDR9:
value = s->addr[8];
break;
case NPCM7XX_SMB_ADDR6:
value = s->addr[5];
break;
case NPCM7XX_SMB_ADDR10:
value = s->addr[9];
break;
case NPCM7XX_SMB_CTL4:
value = s->ctl4;
break;
case NPCM7XX_SMB_CTL5:
value = s->ctl5;
break;
case NPCM7XX_SMB_SCLLT:
value = s->scllt;
break;
case NPCM7XX_SMB_FIF_CTL:
value = s->fif_ctl;
break;
case NPCM7XX_SMB_SCLHT:
value = s->sclht;
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: read from invalid offset 0x%" HWADDR_PRIx "\n",
DEVICE(s)->canonical_path, offset);
break;
}
}
break;
}
trace_npcm7xx_smbus_read(DEVICE(s)->canonical_path, offset, value, size);
return value;
}
static void npcm7xx_smbus_write(void *opaque, hwaddr offset, uint64_t value,
unsigned size)
{
NPCM7xxSMBusState *s = opaque;
uint8_t bank = s->ctl3 & NPCM7XX_SMBCTL3_BNK_SEL;
trace_npcm7xx_smbus_write(DEVICE(s)->canonical_path, offset, value, size);
/* The order of the registers are their order in memory. */
switch (offset) {
case NPCM7XX_SMB_SDA:
npcm7xx_smbus_write_sda(s, value);
break;
case NPCM7XX_SMB_ST:
npcm7xx_smbus_write_st(s, value);
break;
case NPCM7XX_SMB_CST:
npcm7xx_smbus_write_cst(s, value);
break;
case NPCM7XX_SMB_CTL1:
npcm7xx_smbus_write_ctl1(s, value);
break;
case NPCM7XX_SMB_ADDR1:
s->addr[0] = value;
break;
case NPCM7XX_SMB_CTL2:
npcm7xx_smbus_write_ctl2(s, value);
break;
case NPCM7XX_SMB_ADDR2:
s->addr[1] = value;
break;
case NPCM7XX_SMB_CTL3:
npcm7xx_smbus_write_ctl3(s, value);
break;
case NPCM7XX_SMB_CST2:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: write to read-only reg: offset 0x%" HWADDR_PRIx "\n",
DEVICE(s)->canonical_path, offset);
break;
case NPCM7XX_SMB_CST3:
npcm7xx_smbus_write_cst3(s, value);
break;
case NPCM7XX_SMB_VER:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: write to read-only reg: offset 0x%" HWADDR_PRIx "\n",
DEVICE(s)->canonical_path, offset);
break;
/* This register is either invalid or banked at this point. */
default:
if (bank) {
/* Bank 1 */
switch (offset) {
case NPCM7XX_SMB_FIF_CTS:
npcm7xx_smbus_write_fif_cts(s, value);
break;
case NPCM7XX_SMB_FAIR_PER:
s->fair_per = value;
break;
case NPCM7XX_SMB_TXF_CTL:
npcm7xx_smbus_write_txf_ctl(s, value);
break;
case NPCM7XX_SMB_T_OUT:
npcm7xx_smbus_write_t_out(s, value);
break;
case NPCM7XX_SMB_TXF_STS:
npcm7xx_smbus_write_txf_sts(s, value);
break;
case NPCM7XX_SMB_RXF_STS:
npcm7xx_smbus_write_rxf_sts(s, value);
break;
case NPCM7XX_SMB_RXF_CTL:
npcm7xx_smbus_write_rxf_ctl(s, value);
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: write to invalid offset 0x%" HWADDR_PRIx "\n",
DEVICE(s)->canonical_path, offset);
break;
}
} else {
/* Bank 0 */
switch (offset) {
case NPCM7XX_SMB_ADDR3:
s->addr[2] = value;
break;
case NPCM7XX_SMB_ADDR7:
s->addr[6] = value;
break;
case NPCM7XX_SMB_ADDR4:
s->addr[3] = value;
break;
case NPCM7XX_SMB_ADDR8:
s->addr[7] = value;
break;
case NPCM7XX_SMB_ADDR5:
s->addr[4] = value;
break;
case NPCM7XX_SMB_ADDR9:
s->addr[8] = value;
break;
case NPCM7XX_SMB_ADDR6:
s->addr[5] = value;
break;
case NPCM7XX_SMB_ADDR10:
s->addr[9] = value;
break;
case NPCM7XX_SMB_CTL4:
s->ctl4 = value;
break;
case NPCM7XX_SMB_CTL5:
s->ctl5 = value;
break;
case NPCM7XX_SMB_SCLLT:
s->scllt = value;
break;
case NPCM7XX_SMB_FIF_CTL:
npcm7xx_smbus_write_fif_ctl(s, value);
break;
case NPCM7XX_SMB_SCLHT:
s->sclht = value;
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: write to invalid offset 0x%" HWADDR_PRIx "\n",
DEVICE(s)->canonical_path, offset);
break;
}
}
break;
}
}
static const MemoryRegionOps npcm7xx_smbus_ops = {
.read = npcm7xx_smbus_read,
.write = npcm7xx_smbus_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.valid = {
.min_access_size = 1,
.max_access_size = 1,
.unaligned = false,
},
};
static void npcm7xx_smbus_enter_reset(Object *obj, ResetType type)
{
NPCM7xxSMBusState *s = NPCM7XX_SMBUS(obj);
s->st = NPCM7XX_SMB_ST_INIT_VAL;
s->cst = NPCM7XX_SMB_CST_INIT_VAL;
s->cst2 = NPCM7XX_SMB_CST2_INIT_VAL;
s->cst3 = NPCM7XX_SMB_CST3_INIT_VAL;
s->ctl1 = NPCM7XX_SMB_CTL1_INIT_VAL;
s->ctl2 = NPCM7XX_SMB_CTL2_INIT_VAL;
s->ctl3 = NPCM7XX_SMB_CTL3_INIT_VAL;
s->ctl4 = NPCM7XX_SMB_CTL4_INIT_VAL;
s->ctl5 = NPCM7XX_SMB_CTL5_INIT_VAL;
for (int i = 0; i < NPCM7XX_SMBUS_NR_ADDRS; ++i) {
s->addr[i] = NPCM7XX_SMB_ADDR_INIT_VAL;
}
s->scllt = NPCM7XX_SMB_SCLLT_INIT_VAL;
s->sclht = NPCM7XX_SMB_SCLHT_INIT_VAL;
s->fif_ctl = NPCM7XX_SMB_FIF_CTL_INIT_VAL;
s->fif_cts = NPCM7XX_SMB_FIF_CTS_INIT_VAL;
s->fair_per = NPCM7XX_SMB_FAIR_PER_INIT_VAL;
s->txf_ctl = NPCM7XX_SMB_TXF_CTL_INIT_VAL;
s->t_out = NPCM7XX_SMB_T_OUT_INIT_VAL;
s->txf_sts = NPCM7XX_SMB_TXF_STS_INIT_VAL;
s->rxf_sts = NPCM7XX_SMB_RXF_STS_INIT_VAL;
s->rxf_ctl = NPCM7XX_SMB_RXF_CTL_INIT_VAL;
npcm7xx_smbus_clear_buffer(s);
s->status = NPCM7XX_SMBUS_STATUS_IDLE;
s->rx_cur = 0;
}
static void npcm7xx_smbus_hold_reset(Object *obj)
{
NPCM7xxSMBusState *s = NPCM7XX_SMBUS(obj);
qemu_irq_lower(s->irq);
}
static void npcm7xx_smbus_init(Object *obj)
{
NPCM7xxSMBusState *s = NPCM7XX_SMBUS(obj);
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
sysbus_init_irq(sbd, &s->irq);
memory_region_init_io(&s->iomem, obj, &npcm7xx_smbus_ops, s,
"regs", 4 * KiB);
sysbus_init_mmio(sbd, &s->iomem);
s->bus = i2c_init_bus(DEVICE(s), "i2c-bus");
}
static const VMStateDescription vmstate_npcm7xx_smbus = {
.name = "npcm7xx-smbus",
.version_id = 0,
.minimum_version_id = 0,
.fields = (VMStateField[]) {
VMSTATE_UINT8(sda, NPCM7xxSMBusState),
VMSTATE_UINT8(st, NPCM7xxSMBusState),
VMSTATE_UINT8(cst, NPCM7xxSMBusState),
VMSTATE_UINT8(cst2, NPCM7xxSMBusState),
VMSTATE_UINT8(cst3, NPCM7xxSMBusState),
VMSTATE_UINT8(ctl1, NPCM7xxSMBusState),
VMSTATE_UINT8(ctl2, NPCM7xxSMBusState),
VMSTATE_UINT8(ctl3, NPCM7xxSMBusState),
VMSTATE_UINT8(ctl4, NPCM7xxSMBusState),
VMSTATE_UINT8(ctl5, NPCM7xxSMBusState),
VMSTATE_UINT8_ARRAY(addr, NPCM7xxSMBusState, NPCM7XX_SMBUS_NR_ADDRS),
VMSTATE_UINT8(scllt, NPCM7xxSMBusState),
VMSTATE_UINT8(sclht, NPCM7xxSMBusState),
VMSTATE_UINT8(fif_ctl, NPCM7xxSMBusState),
VMSTATE_UINT8(fif_cts, NPCM7xxSMBusState),
VMSTATE_UINT8(fair_per, NPCM7xxSMBusState),
VMSTATE_UINT8(txf_ctl, NPCM7xxSMBusState),
VMSTATE_UINT8(t_out, NPCM7xxSMBusState),
VMSTATE_UINT8(txf_sts, NPCM7xxSMBusState),
VMSTATE_UINT8(rxf_sts, NPCM7xxSMBusState),
VMSTATE_UINT8(rxf_ctl, NPCM7xxSMBusState),
VMSTATE_UINT8_ARRAY(rx_fifo, NPCM7xxSMBusState,
NPCM7XX_SMBUS_FIFO_SIZE),
VMSTATE_UINT8(rx_cur, NPCM7xxSMBusState),
VMSTATE_END_OF_LIST(),
},
};
static void npcm7xx_smbus_class_init(ObjectClass *klass, void *data)
{
ResettableClass *rc = RESETTABLE_CLASS(klass);
DeviceClass *dc = DEVICE_CLASS(klass);
dc->desc = "NPCM7xx System Management Bus";
dc->vmsd = &vmstate_npcm7xx_smbus;
rc->phases.enter = npcm7xx_smbus_enter_reset;
rc->phases.hold = npcm7xx_smbus_hold_reset;
}
static const TypeInfo npcm7xx_smbus_types[] = {
{
.name = TYPE_NPCM7XX_SMBUS,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(NPCM7xxSMBusState),
.class_init = npcm7xx_smbus_class_init,
.instance_init = npcm7xx_smbus_init,
},
};
DEFINE_TYPES(npcm7xx_smbus_types);
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