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hw/i2c: Implement NPCM7XX SMBus Module Single Mode

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This commit implements the single-byte mode of the SMBus.

Each Nuvoton SoC has 16 System Management Bus (SMBus). These buses
compliant with SMBus and I2C protocol.

This patch implements the single-byte mode of the SMBus. In this mode,
the user sends or receives a byte each time. The SMBus device transmits
it to the underlying i2c device and sends an interrupt back to the QEMU
guest.

Reviewed-by: Doug Evans<dje@google.com>
Reviewed-by: Tyrong Ting<kfting@nuvoton.com>
Signed-off-by: Hao Wu <wuhaotsh@google.com>
Reviewed-by: Corey Minyard <cminyard@mvista.com>
Message-id: 20210210220426.3577804-2-wuhaotsh@google.com
Acked-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Hao Wu 2021-02-10 14:04:22 -08:00 committed by Peter Maydell
parent 36cd5fbdbf
commit 94e7787939
7 changed files with 938 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
docs/system/arm/nuvoton.rst
View File

@ -43,6 +43,7 @@ Supported devices
* GPIO controller
* Analog to Digital Converter (ADC)
* Pulse Width Modulation (PWM)
* SMBus controller (SMBF)
Missing devices
---------------
@ -58,7 +59,6 @@ Missing devices
* Ethernet controllers (GMAC and EMC)
* USB device (USBD)
* SMBus controller (SMBF)
* Peripheral SPI controller (PSPI)
* SD/MMC host
* PECI interface

68
hw/arm/npcm7xx.c
View File

@ -102,6 +102,22 @@ enum NPCM7xxInterrupt {
NPCM7XX_WDG2_IRQ, /* Timer Module 2 Watchdog */
NPCM7XX_EHCI_IRQ = 61,
NPCM7XX_OHCI_IRQ = 62,
NPCM7XX_SMBUS0_IRQ = 64,
NPCM7XX_SMBUS1_IRQ,
NPCM7XX_SMBUS2_IRQ,
NPCM7XX_SMBUS3_IRQ,
NPCM7XX_SMBUS4_IRQ,
NPCM7XX_SMBUS5_IRQ,
NPCM7XX_SMBUS6_IRQ,
NPCM7XX_SMBUS7_IRQ,
NPCM7XX_SMBUS8_IRQ,
NPCM7XX_SMBUS9_IRQ,
NPCM7XX_SMBUS10_IRQ,
NPCM7XX_SMBUS11_IRQ,
NPCM7XX_SMBUS12_IRQ,
NPCM7XX_SMBUS13_IRQ,
NPCM7XX_SMBUS14_IRQ,
NPCM7XX_SMBUS15_IRQ,
NPCM7XX_PWM0_IRQ = 93, /* PWM module 0 */
NPCM7XX_PWM1_IRQ, /* PWM module 1 */
NPCM7XX_GPIO0_IRQ = 116,
@ -152,6 +168,26 @@ static const hwaddr npcm7xx_pwm_addr[] = {
0xf0104000,
};
/* Direct memory-mapped access to each SMBus Module. */
static const hwaddr npcm7xx_smbus_addr[] = {
0xf0080000,
0xf0081000,
0xf0082000,
0xf0083000,
0xf0084000,
0xf0085000,
0xf0086000,
0xf0087000,
0xf0088000,
0xf0089000,
0xf008a000,
0xf008b000,
0xf008c000,
0xf008d000,
0xf008e000,
0xf008f000,
};
static const struct {
hwaddr regs_addr;
uint32_t unconnected_pins;
@ -353,6 +389,11 @@ static void npcm7xx_init(Object *obj)
object_initialize_child(obj, "gpio[*]", &s->gpio[i], TYPE_NPCM7XX_GPIO);
}
for (i = 0; i < ARRAY_SIZE(s->smbus); i++) {
object_initialize_child(obj, "smbus[*]", &s->smbus[i],
TYPE_NPCM7XX_SMBUS);
}
object_initialize_child(obj, "ehci", &s->ehci, TYPE_NPCM7XX_EHCI);
object_initialize_child(obj, "ohci", &s->ohci, TYPE_SYSBUS_OHCI);
@ -509,6 +550,17 @@ static void npcm7xx_realize(DeviceState *dev, Error **errp)
npcm7xx_irq(s, NPCM7XX_GPIO0_IRQ + i));
}
/* SMBus modules. Cannot fail. */
QEMU_BUILD_BUG_ON(ARRAY_SIZE(npcm7xx_smbus_addr) != ARRAY_SIZE(s->smbus));
for (i = 0; i < ARRAY_SIZE(s->smbus); i++) {
Object *obj = OBJECT(&s->smbus[i]);
sysbus_realize(SYS_BUS_DEVICE(obj), &error_abort);
sysbus_mmio_map(SYS_BUS_DEVICE(obj), 0, npcm7xx_smbus_addr[i]);
sysbus_connect_irq(SYS_BUS_DEVICE(obj), 0,
npcm7xx_irq(s, NPCM7XX_SMBUS0_IRQ + i));
}
/* USB Host */
object_property_set_bool(OBJECT(&s->ehci), "companion-enable", true,
&error_abort);
@ -576,22 +628,6 @@ static void npcm7xx_realize(DeviceState *dev, Error **errp)
create_unimplemented_device("npcm7xx.pcierc", 0xe1000000, 64 * KiB);
create_unimplemented_device("npcm7xx.kcs", 0xf0007000, 4 * KiB);
create_unimplemented_device("npcm7xx.gfxi", 0xf000e000, 4 * KiB);
create_unimplemented_device("npcm7xx.smbus[0]", 0xf0080000, 4 * KiB);
create_unimplemented_device("npcm7xx.smbus[1]", 0xf0081000, 4 * KiB);
create_unimplemented_device("npcm7xx.smbus[2]", 0xf0082000, 4 * KiB);
create_unimplemented_device("npcm7xx.smbus[3]", 0xf0083000, 4 * KiB);
create_unimplemented_device("npcm7xx.smbus[4]", 0xf0084000, 4 * KiB);
create_unimplemented_device("npcm7xx.smbus[5]", 0xf0085000, 4 * KiB);
create_unimplemented_device("npcm7xx.smbus[6]", 0xf0086000, 4 * KiB);
create_unimplemented_device("npcm7xx.smbus[7]", 0xf0087000, 4 * KiB);
create_unimplemented_device("npcm7xx.smbus[8]", 0xf0088000, 4 * KiB);
create_unimplemented_device("npcm7xx.smbus[9]", 0xf0089000, 4 * KiB);
create_unimplemented_device("npcm7xx.smbus[10]", 0xf008a000, 4 * KiB);
create_unimplemented_device("npcm7xx.smbus[11]", 0xf008b000, 4 * KiB);
create_unimplemented_device("npcm7xx.smbus[12]", 0xf008c000, 4 * KiB);
create_unimplemented_device("npcm7xx.smbus[13]", 0xf008d000, 4 * KiB);
create_unimplemented_device("npcm7xx.smbus[14]", 0xf008e000, 4 * KiB);
create_unimplemented_device("npcm7xx.smbus[15]", 0xf008f000, 4 * KiB);
create_unimplemented_device("npcm7xx.espi", 0xf009f000, 4 * KiB);
create_unimplemented_device("npcm7xx.peci", 0xf0100000, 4 * KiB);
create_unimplemented_device("npcm7xx.siox[1]", 0xf0101000, 4 * KiB);

1
hw/i2c/meson.build
View File

@ -9,6 +9,7 @@ i2c_ss.add(when: 'CONFIG_EXYNOS4', if_true: files('exynos4210_i2c.c'))
i2c_ss.add(when: 'CONFIG_IMX_I2C', if_true: files('imx_i2c.c'))
i2c_ss.add(when: 'CONFIG_MPC_I2C', if_true: files('mpc_i2c.c'))
i2c_ss.add(when: 'CONFIG_NRF51_SOC', if_true: files('microbit_i2c.c'))
i2c_ss.add(when: 'CONFIG_NPCM7XX', if_true: files('npcm7xx_smbus.c'))
i2c_ss.add(when: 'CONFIG_SMBUS_EEPROM', if_true: files('smbus_eeprom.c'))
i2c_ss.add(when: 'CONFIG_VERSATILE_I2C', if_true: files('versatile_i2c.c'))
i2c_ss.add(when: 'CONFIG_OMAP', if_true: files('omap_i2c.c'))

783
hw/i2c/npcm7xx_smbus.c Normal file
View File

@ -0,0 +1,783 @@
/*
* 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)
#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)
/* VERSION fields values, read-only. */
#define NPCM7XX_SMBUS_VERSION_NUMBER 1
#define NPCM7XX_SMBUS_VERSION_FIFO_SUPPORTED 0
/* 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
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));
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_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;
}
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_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;
} 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) {
npcm7xx_smbus_recv_byte(s);
}
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:
npcm7xx_smbus_execute_stop(s);
break;
case NPCM7XX_SMBUS_STATUS_RECEIVING:
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) {
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;
}
}
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 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 */
qemu_log_mask(LOG_GUEST_ERROR,
"%s: read from invalid offset 0x%" HWADDR_PRIx "\n",
DEVICE(s)->canonical_path, offset);
} 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_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 */
qemu_log_mask(LOG_GUEST_ERROR,
"%s: write to invalid offset 0x%" HWADDR_PRIx "\n",
DEVICE(s)->canonical_path, offset);
} 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_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->status = NPCM7XX_SMBUS_STATUS_IDLE;
}
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");
s->status = NPCM7XX_SMBUS_STATUS_IDLE;
}
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_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);

11
hw/i2c/trace-events
View File

@ -14,3 +14,14 @@ aspeed_i2c_bus_read(uint32_t busid, uint64_t offset, unsigned size, uint64_t val
aspeed_i2c_bus_write(uint32_t busid, uint64_t offset, unsigned size, uint64_t value) "bus[%d]: To 0x%" PRIx64 " of size %u: 0x%" PRIx64
aspeed_i2c_bus_send(const char *mode, int i, int count, uint8_t byte) "%s send %d/%d 0x%02x"
aspeed_i2c_bus_recv(const char *mode, int i, int count, uint8_t byte) "%s recv %d/%d 0x%02x"
# npcm7xx_smbus.c
npcm7xx_smbus_read(const char *id, uint64_t offset, uint64_t value, unsigned size) "%s offset: 0x%04" PRIx64 " value: 0x%02" PRIx64 " size: %u"
npcm7xx_smbus_write(const char *id, uint64_t offset, uint64_t value, unsigned size) "%s offset: 0x%04" PRIx64 " value: 0x%02" PRIx64 " size: %u"
npcm7xx_smbus_start(const char *id, int success) "%s starting, success: %d"
npcm7xx_smbus_send_address(const char *id, uint8_t addr, int recv, int success) "%s sending address: 0x%02x, recv: %d, success: %d"
npcm7xx_smbus_send_byte(const char *id, uint8_t value, int success) "%s send byte: 0x%02x, success: %d"
npcm7xx_smbus_recv_byte(const char *id, uint8_t value) "%s recv byte: 0x%02x"
npcm7xx_smbus_stop(const char *id) "%s stopping"
npcm7xx_smbus_nack(const char *id) "%s nacking"

2
include/hw/arm/npcm7xx.h
View File

@ -20,6 +20,7 @@
#include "hw/adc/npcm7xx_adc.h"
#include "hw/cpu/a9mpcore.h"
#include "hw/gpio/npcm7xx_gpio.h"
#include "hw/i2c/npcm7xx_smbus.h"
#include "hw/mem/npcm7xx_mc.h"
#include "hw/misc/npcm7xx_clk.h"
#include "hw/misc/npcm7xx_gcr.h"
@ -85,6 +86,7 @@ typedef struct NPCM7xxState {
NPCM7xxMCState mc;
NPCM7xxRNGState rng;
NPCM7xxGPIOState gpio[8];
NPCM7xxSMBusState smbus[16];
EHCISysBusState ehci;
OHCISysBusState ohci;
NPCM7xxFIUState fiu[2];

88
include/hw/i2c/npcm7xx_smbus.h Normal file
View File

@ -0,0 +1,88 @@
/*
* 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.
*/
#ifndef NPCM7XX_SMBUS_H
#define NPCM7XX_SMBUS_H
#include "exec/memory.h"
#include "hw/i2c/i2c.h"
#include "hw/irq.h"
#include "hw/sysbus.h"
/*
* Number of addresses this module contains. Do not change this without
* incrementing the version_id in the vmstate.
*/
#define NPCM7XX_SMBUS_NR_ADDRS 10
typedef enum NPCM7xxSMBusStatus {
NPCM7XX_SMBUS_STATUS_IDLE,
NPCM7XX_SMBUS_STATUS_SENDING,
NPCM7XX_SMBUS_STATUS_RECEIVING,
NPCM7XX_SMBUS_STATUS_NEGACK,
NPCM7XX_SMBUS_STATUS_STOPPING_LAST_RECEIVE,
NPCM7XX_SMBUS_STATUS_STOPPING_NEGACK,
} NPCM7xxSMBusStatus;
/*
* struct NPCM7xxSMBusState - System Management Bus device state.
* @bus: The underlying I2C Bus.
* @irq: GIC interrupt line to fire on events (if enabled).
* @sda: The serial data register.
* @st: The status register.
* @cst: The control status register.
* @cst2: The control status register 2.
* @cst3: The control status register 3.
* @ctl1: The control register 1.
* @ctl2: The control register 2.
* @ctl3: The control register 3.
* @ctl4: The control register 4.
* @ctl5: The control register 5.
* @addr: The SMBus module's own addresses on the I2C bus.
* @scllt: The SCL low time register.
* @sclht: The SCL high time register.
* @status: The current status of the SMBus.
*/
typedef struct NPCM7xxSMBusState {
SysBusDevice parent;
MemoryRegion iomem;
I2CBus *bus;
qemu_irq irq;
uint8_t sda;
uint8_t st;
uint8_t cst;
uint8_t cst2;
uint8_t cst3;
uint8_t ctl1;
uint8_t ctl2;
uint8_t ctl3;
uint8_t ctl4;
uint8_t ctl5;
uint8_t addr[NPCM7XX_SMBUS_NR_ADDRS];
uint8_t scllt;
uint8_t sclht;
NPCM7xxSMBusStatus status;
} NPCM7xxSMBusState;
#define TYPE_NPCM7XX_SMBUS "npcm7xx-smbus"
#define NPCM7XX_SMBUS(obj) OBJECT_CHECK(NPCM7xxSMBusState, (obj), \
TYPE_NPCM7XX_SMBUS)
#endif /* NPCM7XX_SMBUS_H */