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lib: utils/i2c: Add minimal StarFive jh7110 I2C driver
Starfive JH7110 I2C IP is synopsys designware. Minimum StarFIve I2C driver to read/send bytes over I2C bus. This allows querying information and perform operation of onboard PMIC, as well as power-off and reset. Signed-off-by: Minda Chen <minda.chen@starfivetech.com> Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Minda Chen
Anup Patel
parent
4b28afc98b
commit
e9d08bd99c
5 changed files with 286 additions and 0 deletions
21
include/sbi_utils/i2c/dw_i2c.h
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21
include/sbi_utils/i2c/dw_i2c.h
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@ -0,0 +1,21 @@
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/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2022 StarFive Technology Co., Ltd.
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*
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* Author: Minda Chen <minda.chen@starfivetech.com>
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*/
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#ifndef __DW_I2C_H__
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#define __DW_I2C_H__
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#include <sbi_utils/i2c/i2c.h>
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int dw_i2c_init(struct i2c_adapter *, int nodeoff);
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struct dw_i2c_adapter {
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unsigned long addr;
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struct i2c_adapter adapter;
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};
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#endif
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@ -14,8 +14,16 @@ config FDT_I2C_SIFIVE
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bool "SiFive I2C FDT driver"
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default n
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config FDT_I2C_DW
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bool "Synopsys Designware I2C FDT driver"
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select I2C_DW
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default n
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endif
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config I2C_DW
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bool "Synopsys Designware I2C support"
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default n
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config I2C
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bool "I2C support"
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default n
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190
lib/utils/i2c/dw_i2c.c
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190
lib/utils/i2c/dw_i2c.c
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@ -0,0 +1,190 @@
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/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2022 starfivetech.com
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*
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* Authors:
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* Minda Chen <minda.chen@starfivetech.com>
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*/
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#include <sbi/riscv_io.h>
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#include <sbi/sbi_error.h>
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#include <sbi/sbi_timer.h>
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#include <sbi/sbi_console.h>
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#include <sbi/sbi_string.h>
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#include <sbi/sbi_bitops.h>
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#include <sbi_utils/i2c/dw_i2c.h>
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#define DW_IC_CON 0x00
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#define DW_IC_TAR 0x04
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#define DW_IC_SAR 0x08
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#define DW_IC_DATA_CMD 0x10
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#define DW_IC_SS_SCL_HCNT 0x14
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#define DW_IC_SS_SCL_LCNT 0x18
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#define DW_IC_FS_SCL_HCNT 0x1c
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#define DW_IC_FS_SCL_LCNT 0x20
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#define DW_IC_HS_SCL_HCNT 0x24
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#define DW_IC_HS_SCL_LCNT 0x28
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#define DW_IC_INTR_STAT 0x2c
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#define DW_IC_INTR_MASK 0x30
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#define DW_IC_RAW_INTR_STAT 0x34
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#define DW_IC_RX_TL 0x38
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#define DW_IC_TX_TL 0x3c
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#define DW_IC_CLR_INTR 0x40
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#define DW_IC_CLR_RX_UNDER 0x44
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#define DW_IC_CLR_RX_OVER 0x48
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#define DW_IC_CLR_TX_OVER 0x4c
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#define DW_IC_CLR_RD_REQ 0x50
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#define DW_IC_CLR_TX_ABRT 0x54
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#define DW_IC_CLR_RX_DONE 0x58
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#define DW_IC_CLR_ACTIVITY 0x5c
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#define DW_IC_CLR_STOP_DET 0x60
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#define DW_IC_CLR_START_DET 0x64
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#define DW_IC_CLR_GEN_CALL 0x68
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#define DW_IC_ENABLE 0x6c
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#define DW_IC_STATUS 0x70
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#define DW_IC_TXFLR 0x74
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#define DW_IC_RXFLR 0x78
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#define DW_IC_SDA_HOLD 0x7c
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#define DW_IC_TX_ABRT_SOURCE 0x80
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#define DW_IC_ENABLE_STATUS 0x9c
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#define DW_IC_CLR_RESTART_DET 0xa8
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#define DW_IC_COMP_PARAM_1 0xf4
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#define DW_IC_COMP_VERSION 0xf8
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#define DW_I2C_STATUS_TXFIFO_EMPTY BIT(2)
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#define DW_I2C_STATUS_RXFIFO_NOT_EMPTY BIT(3)
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#define IC_DATA_CMD_READ BIT(8)
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#define IC_DATA_CMD_STOP BIT(9)
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#define IC_DATA_CMD_RESTART BIT(10)
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#define IC_INT_STATUS_STOPDET BIT(9)
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static inline void dw_i2c_setreg(struct dw_i2c_adapter *adap,
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u8 reg, u32 value)
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{
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writel(value, (void *)adap->addr + reg);
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}
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static inline u32 dw_i2c_getreg(struct dw_i2c_adapter *adap,
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u32 reg)
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{
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return readl((void *)adap->addr + reg);
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}
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static int dw_i2c_adapter_poll(struct dw_i2c_adapter *adap,
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u32 mask, u32 addr,
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bool inverted)
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{
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unsigned int timeout = 10; /* msec */
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int count = 0;
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u32 val;
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do {
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val = dw_i2c_getreg(adap, addr);
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if (inverted) {
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if (!(val & mask))
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return 0;
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} else {
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if (val & mask)
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return 0;
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}
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sbi_timer_udelay(2);
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count += 1;
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if (count == (timeout * 1000))
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return SBI_ETIMEDOUT;
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} while (1);
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}
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#define dw_i2c_adapter_poll_rxrdy(adap) \
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dw_i2c_adapter_poll(adap, DW_I2C_STATUS_RXFIFO_NOT_EMPTY, DW_IC_STATUS, 0)
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#define dw_i2c_adapter_poll_txfifo_ready(adap) \
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dw_i2c_adapter_poll(adap, DW_I2C_STATUS_TXFIFO_EMPTY, DW_IC_STATUS, 0)
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static int dw_i2c_write_addr(struct dw_i2c_adapter *adap, u8 addr)
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{
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dw_i2c_setreg(adap, DW_IC_ENABLE, 0);
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dw_i2c_setreg(adap, DW_IC_TAR, addr);
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dw_i2c_setreg(adap, DW_IC_ENABLE, 1);
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return 0;
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}
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static int dw_i2c_adapter_read(struct i2c_adapter *ia, u8 addr,
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u8 reg, u8 *buffer, int len)
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{
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struct dw_i2c_adapter *adap =
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container_of(ia, struct dw_i2c_adapter, adapter);
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int rc;
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dw_i2c_write_addr(adap, addr);
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rc = dw_i2c_adapter_poll_txfifo_ready(adap);
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if (rc)
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return rc;
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/* set register address */
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dw_i2c_setreg(adap, DW_IC_DATA_CMD, reg);
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/* set value */
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while (len) {
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if (len == 1)
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dw_i2c_setreg(adap, DW_IC_DATA_CMD,
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IC_DATA_CMD_READ | IC_DATA_CMD_STOP);
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else
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dw_i2c_setreg(adap, DW_IC_DATA_CMD, IC_DATA_CMD_READ);
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rc = dw_i2c_adapter_poll_rxrdy(adap);
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if (rc)
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return rc;
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*buffer = dw_i2c_getreg(adap, DW_IC_DATA_CMD) & 0xff;
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buffer++;
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len--;
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}
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return 0;
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}
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static int dw_i2c_adapter_write(struct i2c_adapter *ia, u8 addr,
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u8 reg, u8 *buffer, int len)
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{
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struct dw_i2c_adapter *adap =
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container_of(ia, struct dw_i2c_adapter, adapter);
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int rc;
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dw_i2c_write_addr(adap, addr);
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rc = dw_i2c_adapter_poll_txfifo_ready(adap);
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if (rc)
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return rc;
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/* set register address */
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dw_i2c_setreg(adap, DW_IC_DATA_CMD, reg);
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while (len) {
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rc = dw_i2c_adapter_poll_txfifo_ready(adap);
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if (rc)
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return rc;
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if (len == 1)
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dw_i2c_setreg(adap, DW_IC_DATA_CMD, *buffer | IC_DATA_CMD_STOP);
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else
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dw_i2c_setreg(adap, DW_IC_DATA_CMD, *buffer);
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buffer++;
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len--;
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}
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rc = dw_i2c_adapter_poll_txfifo_ready(adap);
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return rc;
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}
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int dw_i2c_init(struct i2c_adapter *adapter, int nodeoff)
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{
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adapter->id = nodeoff;
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adapter->write = dw_i2c_adapter_write;
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adapter->read = dw_i2c_adapter_read;
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return i2c_adapter_add(adapter);
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}
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62
lib/utils/i2c/fdt_i2c_dw.c
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62
lib/utils/i2c/fdt_i2c_dw.c
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/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2022 starfivetech.com
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*
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* Authors:
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* Minda Chen <minda.chen@starfivetech.com>
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*/
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#include <sbi/riscv_io.h>
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#include <sbi/sbi_error.h>
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#include <sbi/sbi_string.h>
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#include <sbi_utils/fdt/fdt_helper.h>
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#include <sbi_utils/i2c/dw_i2c.h>
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#include <sbi_utils/i2c/fdt_i2c.h>
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#define FDT_DW_I2C_ADAPTER_MAX 7
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static unsigned int fdt_dw_i2c_adapter_count;
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static struct dw_i2c_adapter
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fdt_dw_i2c_adapter_array[FDT_DW_I2C_ADAPTER_MAX];
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extern struct fdt_i2c_adapter fdt_i2c_adapter_dw;
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static int fdt_dw_i2c_init(void *fdt, int nodeoff,
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const struct fdt_match *match)
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{
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int rc;
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struct dw_i2c_adapter *adapter;
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u64 addr;
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if (fdt_dw_i2c_adapter_count >= FDT_DW_I2C_ADAPTER_MAX)
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return SBI_ENOSPC;
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adapter = &fdt_dw_i2c_adapter_array[fdt_dw_i2c_adapter_count];
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rc = fdt_get_node_addr_size(fdt, nodeoff, 0, &addr, NULL);
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if (rc)
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return rc;
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adapter->addr = addr;
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adapter->adapter.driver = &fdt_i2c_adapter_dw;
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rc = dw_i2c_init(&adapter->adapter, nodeoff);
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if (rc)
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return rc;
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fdt_dw_i2c_adapter_count++;
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return 0;
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}
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static const struct fdt_match fdt_dw_i2c_match[] = {
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{ .compatible = "snps,designware-i2c" },
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{ .compatible = "starfive,jh7110-i2c" },
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{ },
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};
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struct fdt_i2c_adapter fdt_i2c_adapter_dw = {
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.match_table = fdt_dw_i2c_match,
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.init = fdt_dw_i2c_init,
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};
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@ -14,3 +14,8 @@ libsbiutils-objs-$(CONFIG_FDT_I2C) += i2c/fdt_i2c_adapter_drivers.o
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carray-fdt_i2c_adapter_drivers-$(CONFIG_FDT_I2C_SIFIVE) += fdt_i2c_adapter_sifive
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libsbiutils-objs-$(CONFIG_FDT_I2C_SIFIVE) += i2c/fdt_i2c_sifive.o
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carray-fdt_i2c_adapter_drivers-$(CONFIG_FDT_I2C_DW) += fdt_i2c_adapter_dw
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libsbiutils-objs-$(CONFIG_FDT_I2C_DW) += i2c/fdt_i2c_dw.o
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libsbiutils-objs-$(CONFIG_I2C_DW) += i2c/dw_i2c.o
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