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qemu-e2k/include/hw/i2c/aspeed_i2c.h
Peter Delevoryas 3648d31fa8 hw/i2c/aspeed: Fix old reg slave receive 
I think when Klaus ported his slave mode changes from the original patch
series to the rewritten I2C module, he changed the behavior of the first
byte that is received by the slave device.

What's supposed to happen is that the AspeedI2CBus's slave device's
i2c_event callback should run, and if the event is "send_async", then it
should populate the byte buffer with the 8-bit I2C address that is being
sent to. Since we only support "send_async", the lowest bit should
always be 0 (indicating that the master is requesting to send data).

This is the code Klaus had previously, for reference. [1]

    switch (event) {
    case I2C_START_SEND:
        bus->buf = bus->dev_addr << 1;

        bus->buf &= I2CD_BYTE_BUF_RX_MASK;
        bus->buf <<= I2CD_BYTE_BUF_RX_SHIFT;

        bus->intr_status |= (I2CD_INTR_SLAVE_ADDR_RX_MATCH | I2CD_INTR_RX_DONE);
        aspeed_i2c_set_state(bus, I2CD_STXD);

        break;

[1]: https://lore.kernel.org/qemu-devel/20220331165737.1073520-4-its@irrelevant.dk/

Fixes: a8d48f59cd ("hw/i2c/aspeed: add slave device in old register mode")
Signed-off-by: Peter Delevoryas <peter@pjd.dev>
Reviewed-by: Klaus Jensen <k.jensen@samsung.com>
Message-Id: <20220820225712.713209-2-peter@pjd.dev>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
2022-10-24 11:20:15 +02:00

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/*
* ASPEED AST2400 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef ASPEED_I2C_H
#define ASPEED_I2C_H
#include "hw/i2c/i2c.h"
#include "hw/sysbus.h"
#include "hw/registerfields.h"
#include "qom/object.h"
#define TYPE_ASPEED_I2C "aspeed.i2c"
#define TYPE_ASPEED_2400_I2C TYPE_ASPEED_I2C "-ast2400"
#define TYPE_ASPEED_2500_I2C TYPE_ASPEED_I2C "-ast2500"
#define TYPE_ASPEED_2600_I2C TYPE_ASPEED_I2C "-ast2600"
#define TYPE_ASPEED_1030_I2C TYPE_ASPEED_I2C "-ast1030"
OBJECT_DECLARE_TYPE(AspeedI2CState, AspeedI2CClass, ASPEED_I2C)
#define ASPEED_I2C_NR_BUSSES 16
#define ASPEED_I2C_MAX_POOL_SIZE 0x800
#define ASPEED_I2C_OLD_NUM_REG 11
#define ASPEED_I2C_NEW_NUM_REG 22
/* 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
/* I2C Global Register */
REG32(I2C_CTRL_STATUS, 0x0) /* Device Interrupt Status */
REG32(I2C_CTRL_ASSIGN, 0x8) /* Device Interrupt Target Assignment */
REG32(I2C_CTRL_GLOBAL, 0xC) /* Global Control Register */
FIELD(I2C_CTRL_GLOBAL, REG_MODE, 2, 1)
FIELD(I2C_CTRL_GLOBAL, SRAM_EN, 0, 1)
REG32(I2C_CTRL_NEW_CLK_DIVIDER, 0x10) /* New mode clock divider */
/* I2C Old Mode Device (Bus) Register */
REG32(I2CD_FUN_CTRL, 0x0) /* I2CD Function Control */
FIELD(I2CD_FUN_CTRL, POOL_PAGE_SEL, 20, 3) /* AST2400 */
SHARED_FIELD(M_SDA_LOCK_EN, 16, 1)
SHARED_FIELD(MULTI_MASTER_DIS, 15, 1)
SHARED_FIELD(M_SCL_DRIVE_EN, 14, 1)
SHARED_FIELD(MSB_STS, 9, 1)
SHARED_FIELD(SDA_DRIVE_IT_EN, 8, 1)
SHARED_FIELD(M_SDA_DRIVE_IT_EN, 7, 1)
SHARED_FIELD(M_HIGH_SPEED_EN, 6, 1)
SHARED_FIELD(DEF_ADDR_EN, 5, 1)
SHARED_FIELD(DEF_ALERT_EN, 4, 1)
SHARED_FIELD(DEF_ARP_EN, 3, 1)
SHARED_FIELD(DEF_GCALL_EN, 2, 1)
SHARED_FIELD(SLAVE_EN, 1, 1)
SHARED_FIELD(MASTER_EN, 0, 1)
REG32(I2CD_AC_TIMING1, 0x04) /* Clock and AC Timing Control #1 */
REG32(I2CD_AC_TIMING2, 0x08) /* Clock and AC Timing Control #2 */
REG32(I2CD_INTR_CTRL, 0x0C) /* I2CD Interrupt Control */
REG32(I2CD_INTR_STS, 0x10) /* I2CD Interrupt Status */
SHARED_FIELD(SLAVE_ADDR_MATCH, 31, 1) /* 0: addr1 1: addr2 */
SHARED_FIELD(SLAVE_ADDR_RX_PENDING, 29, 1)
SHARED_FIELD(SLAVE_INACTIVE_TIMEOUT, 15, 1)
SHARED_FIELD(SDA_DL_TIMEOUT, 14, 1)
SHARED_FIELD(BUS_RECOVER_DONE, 13, 1)
SHARED_FIELD(SMBUS_ALERT, 12, 1) /* Bus [0-3] only */
FIELD(I2CD_INTR_STS, SMBUS_ARP_ADDR, 11, 1) /* Removed */
FIELD(I2CD_INTR_STS, SMBUS_DEV_ALERT_ADDR, 10, 1) /* Removed */
FIELD(I2CD_INTR_STS, SMBUS_DEF_ADDR, 9, 1) /* Removed */
FIELD(I2CD_INTR_STS, GCALL_ADDR, 8, 1) /* Removed */
FIELD(I2CD_INTR_STS, SLAVE_ADDR_RX_MATCH, 7, 1) /* use RX_DONE */
SHARED_FIELD(SCL_TIMEOUT, 6, 1)
SHARED_FIELD(ABNORMAL, 5, 1)
SHARED_FIELD(NORMAL_STOP, 4, 1)
SHARED_FIELD(ARBIT_LOSS, 3, 1)
SHARED_FIELD(RX_DONE, 2, 1)
SHARED_FIELD(TX_NAK, 1, 1)
SHARED_FIELD(TX_ACK, 0, 1)
REG32(I2CD_CMD, 0x14) /* I2CD Command/Status */
SHARED_FIELD(SDA_OE, 28, 1)
SHARED_FIELD(SDA_O, 27, 1)
SHARED_FIELD(SCL_OE, 26, 1)
SHARED_FIELD(SCL_O, 25, 1)
SHARED_FIELD(TX_TIMING, 23, 2)
SHARED_FIELD(TX_STATE, 19, 4)
SHARED_FIELD(SCL_LINE_STS, 18, 1)
SHARED_FIELD(SDA_LINE_STS, 17, 1)
SHARED_FIELD(BUS_BUSY_STS, 16, 1)
SHARED_FIELD(SDA_OE_OUT_DIR, 15, 1)
SHARED_FIELD(SDA_O_OUT_DIR, 14, 1)
SHARED_FIELD(SCL_OE_OUT_DIR, 13, 1)
SHARED_FIELD(SCL_O_OUT_DIR, 12, 1)
SHARED_FIELD(BUS_RECOVER_CMD_EN, 11, 1)
SHARED_FIELD(S_ALT_EN, 10, 1)
/* Command Bits */
SHARED_FIELD(RX_DMA_EN, 9, 1)
SHARED_FIELD(TX_DMA_EN, 8, 1)
SHARED_FIELD(RX_BUFF_EN, 7, 1)
SHARED_FIELD(TX_BUFF_EN, 6, 1)
SHARED_FIELD(M_STOP_CMD, 5, 1)
SHARED_FIELD(M_S_RX_CMD_LAST, 4, 1)
SHARED_FIELD(M_RX_CMD, 3, 1)
SHARED_FIELD(S_TX_CMD, 2, 1)
SHARED_FIELD(M_TX_CMD, 1, 1)
SHARED_FIELD(M_START_CMD, 0, 1)
REG32(I2CD_DEV_ADDR, 0x18) /* Slave Device Address */
SHARED_FIELD(SLAVE_DEV_ADDR1, 0, 7)
REG32(I2CD_POOL_CTRL, 0x1C) /* Pool Buffer Control */
SHARED_FIELD(RX_COUNT, 24, 5)
SHARED_FIELD(RX_SIZE, 16, 5)
SHARED_FIELD(TX_COUNT, 9, 5)
FIELD(I2CD_POOL_CTRL, OFFSET, 2, 6) /* AST2400 */
REG32(I2CD_BYTE_BUF, 0x20) /* Transmit/Receive Byte Buffer */
SHARED_FIELD(RX_BUF, 8, 8)
SHARED_FIELD(TX_BUF, 0, 8)
REG32(I2CD_DMA_ADDR, 0x24) /* DMA Buffer Address */
REG32(I2CD_DMA_LEN, 0x28) /* DMA Transfer Length < 4KB */
/* I2C New Mode Device (Bus) Register */
REG32(I2CC_FUN_CTRL, 0x0)
FIELD(I2CC_FUN_CTRL, RB_EARLY_DONE_EN, 22, 1)
FIELD(I2CC_FUN_CTRL, DMA_DIS_AUTO_RECOVER, 21, 1)
FIELD(I2CC_FUN_CTRL, S_SAVE_ADDR, 20, 1)
FIELD(I2CC_FUN_CTRL, M_PKT_RETRY_CNT, 18, 2)
/* 17:0 shared with I2CD_FUN_CTRL[17:0] */
REG32(I2CC_AC_TIMING, 0x04)
REG32(I2CC_MS_TXRX_BYTE_BUF, 0x08)
/* 31:16 shared with I2CD_CMD[31:16] */
/* 15:0 shared with I2CD_BYTE_BUF[15:0] */
REG32(I2CC_POOL_CTRL, 0x0c)
/* 31:0 shared with I2CD_POOL_CTRL[31:0] */
REG32(I2CM_INTR_CTRL, 0x10)
REG32(I2CM_INTR_STS, 0x14)
FIELD(I2CM_INTR_STS, PKT_STATE, 28, 4)
FIELD(I2CM_INTR_STS, PKT_CMD_TIMEOUT, 18, 1)
FIELD(I2CM_INTR_STS, PKT_CMD_FAIL, 17, 1)
FIELD(I2CM_INTR_STS, PKT_CMD_DONE, 16, 1)
FIELD(I2CM_INTR_STS, BUS_RECOVER_FAIL, 15, 1)
/* 14:0 shared with I2CD_INTR_STS[14:0] */
REG32(I2CM_CMD, 0x18)
FIELD(I2CM_CMD, W1_CTRL, 31, 1)
FIELD(I2CM_CMD, PKT_DEV_ADDR, 24, 7)
FIELD(I2CM_CMD, HS_MASTER_MODE_LSB, 17, 3)
FIELD(I2CM_CMD, PKT_OP_EN, 16, 1)
/* 15:0 shared with I2CD_CMD[15:0] */
REG32(I2CM_DMA_LEN, 0x1c)
FIELD(I2CM_DMA_LEN, RX_BUF_LEN_W1T, 31, 1)
FIELD(I2CM_DMA_LEN, RX_BUF_LEN, 16, 11)
FIELD(I2CM_DMA_LEN, TX_BUF_LEN_W1T, 15, 1)
FIELD(I2CM_DMA_LEN, TX_BUF_LEN, 0, 11)
REG32(I2CS_INTR_CTRL, 0x20)
FIELD(I2CS_INTR_CTRL, PKT_CMD_FAIL, 17, 1)
FIELD(I2CS_INTR_CTRL, PKT_CMD_DONE, 16, 1)
REG32(I2CS_INTR_STS, 0x24)
/* 31:29 shared with I2CD_INTR_STS[31:29] */
FIELD(I2CS_INTR_STS, SLAVE_PARKING_STS, 24, 2)
FIELD(I2CS_INTR_STS, SLAVE_ADDR3_NAK, 22, 1)
FIELD(I2CS_INTR_STS, SLAVE_ADDR2_NAK, 21, 1)
FIELD(I2CS_INTR_STS, SLAVE_ADDR1_NAK, 20, 1)
FIELD(I2CS_INTR_STS, SLAVE_ADDR_INDICATOR, 18, 2)
FIELD(I2CS_INTR_STS, PKT_CMD_FAIL, 17, 1)
FIELD(I2CS_INTR_STS, PKT_CMD_DONE, 16, 1)
/* 14:0 shared with I2CD_INTR_STS[14:0] */
FIELD(I2CS_INTR_STS, SLAVE_ADDR_RX_MATCH, 7, 1)
REG32(I2CS_CMD, 0x28)
FIELD(I2CS_CMD, W1_CTRL, 31, 1)
FIELD(I2CS_CMD, PKT_MODE_ACTIVE_ADDR, 17, 2)
FIELD(I2CS_CMD, PKT_MODE_EN, 16, 1)
FIELD(I2CS_CMD, AUTO_NAK_INACTIVE_ADDR, 15, 1)
FIELD(I2CS_CMD, AUTO_NAK_ACTIVE_ADDR, 14, 1)
/* 13:0 shared with I2CD_CMD[13:0] */
REG32(I2CS_DMA_LEN, 0x2c)
FIELD(I2CS_DMA_LEN, RX_BUF_LEN_W1T, 31, 1)
FIELD(I2CS_DMA_LEN, RX_BUF_LEN, 16, 11)
FIELD(I2CS_DMA_LEN, TX_BUF_LEN_W1T, 15, 1)
FIELD(I2CS_DMA_LEN, TX_BUF_LEN, 0, 11)
REG32(I2CM_DMA_TX_ADDR, 0x30)
FIELD(I2CM_DMA_TX_ADDR, ADDR, 0, 31)
REG32(I2CM_DMA_RX_ADDR, 0x34)
FIELD(I2CM_DMA_RX_ADDR, ADDR, 0, 31)
REG32(I2CS_DMA_TX_ADDR, 0x38)
FIELD(I2CS_DMA_TX_ADDR, ADDR, 0, 31)
REG32(I2CS_DMA_RX_ADDR, 0x3c)
FIELD(I2CS_DMA_RX_ADDR, ADDR, 0, 31)
REG32(I2CS_DEV_ADDR, 0x40)
REG32(I2CM_DMA_LEN_STS, 0x48)
FIELD(I2CM_DMA_LEN_STS, RX_LEN, 16, 13)
FIELD(I2CM_DMA_LEN_STS, TX_LEN, 0, 13)
REG32(I2CS_DMA_LEN_STS, 0x4c)
FIELD(I2CS_DMA_LEN_STS, RX_LEN, 16, 13)
FIELD(I2CS_DMA_LEN_STS, TX_LEN, 0, 13)
REG32(I2CC_DMA_ADDR, 0x50)
REG32(I2CC_DMA_LEN, 0x54)
struct AspeedI2CState;
#define TYPE_ASPEED_I2C_BUS "aspeed.i2c.bus"
OBJECT_DECLARE_SIMPLE_TYPE(AspeedI2CBus, ASPEED_I2C_BUS)
struct AspeedI2CBus {
SysBusDevice parent_obj;
struct AspeedI2CState *controller;
/* slave mode */
I2CSlave *slave;
MemoryRegion mr;
I2CBus *bus;
uint8_t id;
qemu_irq irq;
uint32_t regs[ASPEED_I2C_NEW_NUM_REG];
};
struct AspeedI2CState {
SysBusDevice parent_obj;
MemoryRegion iomem;
qemu_irq irq;
uint32_t intr_status;
uint32_t ctrl_global;
uint32_t new_clk_divider;
MemoryRegion pool_iomem;
uint8_t pool[ASPEED_I2C_MAX_POOL_SIZE];
AspeedI2CBus busses[ASPEED_I2C_NR_BUSSES];
MemoryRegion *dram_mr;
AddressSpace dram_as;
};
#define TYPE_ASPEED_I2C_BUS_SLAVE "aspeed.i2c.slave"
OBJECT_DECLARE_SIMPLE_TYPE(AspeedI2CBusSlave, ASPEED_I2C_BUS_SLAVE)
struct AspeedI2CBusSlave {
I2CSlave i2c;
};
struct AspeedI2CClass {
SysBusDeviceClass parent_class;
uint8_t num_busses;
uint8_t reg_size;
uint8_t gap;
qemu_irq (*bus_get_irq)(AspeedI2CBus *);
uint64_t pool_size;
hwaddr pool_base;
uint8_t *(*bus_pool_base)(AspeedI2CBus *);
bool check_sram;
bool has_dma;
};
static inline bool aspeed_i2c_is_new_mode(AspeedI2CState *s)
{
return FIELD_EX32(s->ctrl_global, I2C_CTRL_GLOBAL, REG_MODE);
}
static inline bool aspeed_i2c_bus_pkt_mode_en(AspeedI2CBus *bus)
{
if (aspeed_i2c_is_new_mode(bus->controller)) {
return ARRAY_FIELD_EX32(bus->regs, I2CM_CMD, PKT_OP_EN);
}
return false;
}
static inline uint32_t aspeed_i2c_bus_ctrl_offset(AspeedI2CBus *bus)
{
if (aspeed_i2c_is_new_mode(bus->controller)) {
return R_I2CC_FUN_CTRL;
}
return R_I2CD_FUN_CTRL;
}
static inline uint32_t aspeed_i2c_bus_cmd_offset(AspeedI2CBus *bus)
{
if (aspeed_i2c_is_new_mode(bus->controller)) {
return R_I2CM_CMD;
}
return R_I2CD_CMD;
}
static inline uint32_t aspeed_i2c_bus_dev_addr_offset(AspeedI2CBus *bus)
{
if (aspeed_i2c_is_new_mode(bus->controller)) {
return R_I2CS_DEV_ADDR;
}
return R_I2CD_DEV_ADDR;
}
static inline uint32_t aspeed_i2c_bus_intr_ctrl_offset(AspeedI2CBus *bus)
{
if (aspeed_i2c_is_new_mode(bus->controller)) {
return R_I2CM_INTR_CTRL;
}
return R_I2CD_INTR_CTRL;
}
static inline uint32_t aspeed_i2c_bus_intr_sts_offset(AspeedI2CBus *bus)
{
if (aspeed_i2c_is_new_mode(bus->controller)) {
return R_I2CM_INTR_STS;
}
return R_I2CD_INTR_STS;
}
static inline uint32_t aspeed_i2c_bus_pool_ctrl_offset(AspeedI2CBus *bus)
{
if (aspeed_i2c_is_new_mode(bus->controller)) {
return R_I2CC_POOL_CTRL;
}
return R_I2CD_POOL_CTRL;
}
static inline uint32_t aspeed_i2c_bus_byte_buf_offset(AspeedI2CBus *bus)
{
if (aspeed_i2c_is_new_mode(bus->controller)) {
return R_I2CC_MS_TXRX_BYTE_BUF;
}
return R_I2CD_BYTE_BUF;
}
static inline uint32_t aspeed_i2c_bus_dma_len_offset(AspeedI2CBus *bus)
{
if (aspeed_i2c_is_new_mode(bus->controller)) {
return R_I2CC_DMA_LEN;
}
return R_I2CD_DMA_LEN;
}
static inline uint32_t aspeed_i2c_bus_dma_addr_offset(AspeedI2CBus *bus)
{
if (aspeed_i2c_is_new_mode(bus->controller)) {
return R_I2CC_DMA_ADDR;
}
return R_I2CD_DMA_ADDR;
}
static inline bool aspeed_i2c_bus_is_master(AspeedI2CBus *bus)
{
return SHARED_ARRAY_FIELD_EX32(bus->regs, aspeed_i2c_bus_ctrl_offset(bus),
MASTER_EN);
}
static inline bool aspeed_i2c_bus_is_enabled(AspeedI2CBus *bus)
{
uint32_t ctrl_reg = aspeed_i2c_bus_ctrl_offset(bus);
return SHARED_ARRAY_FIELD_EX32(bus->regs, ctrl_reg, MASTER_EN) ||
SHARED_ARRAY_FIELD_EX32(bus->regs, ctrl_reg, SLAVE_EN);
}
I2CBus *aspeed_i2c_get_bus(AspeedI2CState *s, int busnr);
#endif /* ASPEED_I2C_H */
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