327 lines
11 KiB
C
327 lines
11 KiB
C
/*
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* Synopsys DesignWare I2C adapter driver.
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*
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* Based on the TI DAVINCI I2C adapter driver.
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*
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* Copyright (C) 2006 Texas Instruments.
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* Copyright (C) 2007 MontaVista Software Inc.
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* Copyright (C) 2009 Provigent Ltd.
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*
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* ----------------------------------------------------------------------------
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* ----------------------------------------------------------------------------
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*
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*/
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#include <linux/i2c.h>
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#include <linux/pm_qos.h>
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#define DW_IC_DEFAULT_FUNCTIONALITY (I2C_FUNC_I2C | \
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I2C_FUNC_SMBUS_BYTE | \
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I2C_FUNC_SMBUS_BYTE_DATA | \
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I2C_FUNC_SMBUS_WORD_DATA | \
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I2C_FUNC_SMBUS_BLOCK_DATA | \
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I2C_FUNC_SMBUS_I2C_BLOCK)
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#define DW_IC_CON_MASTER 0x1
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#define DW_IC_CON_SPEED_STD 0x2
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#define DW_IC_CON_SPEED_FAST 0x4
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#define DW_IC_CON_SPEED_HIGH 0x6
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#define DW_IC_CON_SPEED_MASK 0x6
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#define DW_IC_CON_10BITADDR_SLAVE 0x8
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#define DW_IC_CON_10BITADDR_MASTER 0x10
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#define DW_IC_CON_RESTART_EN 0x20
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#define DW_IC_CON_SLAVE_DISABLE 0x40
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#define DW_IC_CON_STOP_DET_IFADDRESSED 0x80
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#define DW_IC_CON_TX_EMPTY_CTRL 0x100
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#define DW_IC_CON_RX_FIFO_FULL_HLD_CTRL 0x200
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/*
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* Registers offset
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*/
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#define DW_IC_CON 0x0
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#define DW_IC_TAR 0x4
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#define DW_IC_SAR 0x8
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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_IC_SDA_HOLD_MIN_VERS 0x3131312A
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#define DW_IC_COMP_TYPE 0xfc
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#define DW_IC_COMP_TYPE_VALUE 0x44570140
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#define DW_IC_INTR_RX_UNDER 0x001
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#define DW_IC_INTR_RX_OVER 0x002
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#define DW_IC_INTR_RX_FULL 0x004
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#define DW_IC_INTR_TX_OVER 0x008
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#define DW_IC_INTR_TX_EMPTY 0x010
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#define DW_IC_INTR_RD_REQ 0x020
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#define DW_IC_INTR_TX_ABRT 0x040
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#define DW_IC_INTR_RX_DONE 0x080
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#define DW_IC_INTR_ACTIVITY 0x100
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#define DW_IC_INTR_STOP_DET 0x200
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#define DW_IC_INTR_START_DET 0x400
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#define DW_IC_INTR_GEN_CALL 0x800
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#define DW_IC_INTR_RESTART_DET 0x1000
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#define DW_IC_INTR_DEFAULT_MASK (DW_IC_INTR_RX_FULL | \
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DW_IC_INTR_TX_ABRT | \
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DW_IC_INTR_STOP_DET)
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#define DW_IC_INTR_MASTER_MASK (DW_IC_INTR_DEFAULT_MASK | \
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DW_IC_INTR_TX_EMPTY)
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#define DW_IC_INTR_SLAVE_MASK (DW_IC_INTR_DEFAULT_MASK | \
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DW_IC_INTR_RX_DONE | \
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DW_IC_INTR_RX_UNDER | \
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DW_IC_INTR_RD_REQ)
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#define DW_IC_STATUS_ACTIVITY 0x1
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#define DW_IC_STATUS_TFE BIT(2)
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#define DW_IC_STATUS_MASTER_ACTIVITY BIT(5)
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#define DW_IC_STATUS_SLAVE_ACTIVITY BIT(6)
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#define DW_IC_SDA_HOLD_RX_SHIFT 16
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#define DW_IC_SDA_HOLD_RX_MASK GENMASK(23, DW_IC_SDA_HOLD_RX_SHIFT)
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#define DW_IC_ERR_TX_ABRT 0x1
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#define DW_IC_TAR_10BITADDR_MASTER BIT(12)
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#define DW_IC_COMP_PARAM_1_SPEED_MODE_HIGH (BIT(2) | BIT(3))
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#define DW_IC_COMP_PARAM_1_SPEED_MODE_MASK GENMASK(3, 2)
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/*
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* status codes
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*/
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#define STATUS_IDLE 0x0
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#define STATUS_WRITE_IN_PROGRESS 0x1
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#define STATUS_READ_IN_PROGRESS 0x2
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#define TIMEOUT 20 /* ms */
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/*
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* operation modes
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*/
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#define DW_IC_MASTER 0
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#define DW_IC_SLAVE 1
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/*
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* Hardware abort codes from the DW_IC_TX_ABRT_SOURCE register
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*
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* Only expected abort codes are listed here
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* refer to the datasheet for the full list
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*/
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#define ABRT_7B_ADDR_NOACK 0
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#define ABRT_10ADDR1_NOACK 1
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#define ABRT_10ADDR2_NOACK 2
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#define ABRT_TXDATA_NOACK 3
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#define ABRT_GCALL_NOACK 4
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#define ABRT_GCALL_READ 5
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#define ABRT_SBYTE_ACKDET 7
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#define ABRT_SBYTE_NORSTRT 9
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#define ABRT_10B_RD_NORSTRT 10
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#define ABRT_MASTER_DIS 11
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#define ARB_LOST 12
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#define ABRT_SLAVE_FLUSH_TXFIFO 13
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#define ABRT_SLAVE_ARBLOST 14
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#define ABRT_SLAVE_RD_INTX 15
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#define DW_IC_TX_ABRT_7B_ADDR_NOACK (1UL << ABRT_7B_ADDR_NOACK)
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#define DW_IC_TX_ABRT_10ADDR1_NOACK (1UL << ABRT_10ADDR1_NOACK)
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#define DW_IC_TX_ABRT_10ADDR2_NOACK (1UL << ABRT_10ADDR2_NOACK)
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#define DW_IC_TX_ABRT_TXDATA_NOACK (1UL << ABRT_TXDATA_NOACK)
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#define DW_IC_TX_ABRT_GCALL_NOACK (1UL << ABRT_GCALL_NOACK)
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#define DW_IC_TX_ABRT_GCALL_READ (1UL << ABRT_GCALL_READ)
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#define DW_IC_TX_ABRT_SBYTE_ACKDET (1UL << ABRT_SBYTE_ACKDET)
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#define DW_IC_TX_ABRT_SBYTE_NORSTRT (1UL << ABRT_SBYTE_NORSTRT)
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#define DW_IC_TX_ABRT_10B_RD_NORSTRT (1UL << ABRT_10B_RD_NORSTRT)
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#define DW_IC_TX_ABRT_MASTER_DIS (1UL << ABRT_MASTER_DIS)
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#define DW_IC_TX_ARB_LOST (1UL << ARB_LOST)
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#define DW_IC_RX_ABRT_SLAVE_RD_INTX (1UL << ABRT_SLAVE_RD_INTX)
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#define DW_IC_RX_ABRT_SLAVE_ARBLOST (1UL << ABRT_SLAVE_ARBLOST)
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#define DW_IC_RX_ABRT_SLAVE_FLUSH_TXFIFO (1UL << ABRT_SLAVE_FLUSH_TXFIFO)
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#define DW_IC_TX_ABRT_NOACK (DW_IC_TX_ABRT_7B_ADDR_NOACK | \
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DW_IC_TX_ABRT_10ADDR1_NOACK | \
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DW_IC_TX_ABRT_10ADDR2_NOACK | \
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DW_IC_TX_ABRT_TXDATA_NOACK | \
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DW_IC_TX_ABRT_GCALL_NOACK)
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/**
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* struct dw_i2c_dev - private i2c-designware data
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* @dev: driver model device node
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* @base: IO registers pointer
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* @cmd_complete: tx completion indicator
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* @clk: input reference clock
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* @slave: represent an I2C slave device
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* @cmd_err: run time hadware error code
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* @msgs: points to an array of messages currently being transferred
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* @msgs_num: the number of elements in msgs
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* @msg_write_idx: the element index of the current tx message in the msgs
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* array
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* @tx_buf_len: the length of the current tx buffer
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* @tx_buf: the current tx buffer
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* @msg_read_idx: the element index of the current rx message in the msgs
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* array
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* @rx_buf_len: the length of the current rx buffer
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* @rx_buf: the current rx buffer
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* @msg_err: error status of the current transfer
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* @status: i2c master status, one of STATUS_*
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* @abort_source: copy of the TX_ABRT_SOURCE register
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* @irq: interrupt number for the i2c master
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* @adapter: i2c subsystem adapter node
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* @slave_cfg: configuration for the slave device
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* @tx_fifo_depth: depth of the hardware tx fifo
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* @rx_fifo_depth: depth of the hardware rx fifo
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* @rx_outstanding: current master-rx elements in tx fifo
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* @clk_freq: bus clock frequency
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* @ss_hcnt: standard speed HCNT value
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* @ss_lcnt: standard speed LCNT value
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* @fs_hcnt: fast speed HCNT value
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* @fs_lcnt: fast speed LCNT value
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* @fp_hcnt: fast plus HCNT value
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* @fp_lcnt: fast plus LCNT value
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* @hs_hcnt: high speed HCNT value
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* @hs_lcnt: high speed LCNT value
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* @pm_qos: pm_qos_request used while holding a hardware lock on the bus
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* @acquire_lock: function to acquire a hardware lock on the bus
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* @release_lock: function to release a hardware lock on the bus
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* @pm_disabled: true if power-management should be disabled for this i2c-bus
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* @disable: function to disable the controller
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* @disable_int: function to disable all interrupts
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* @init: function to initialize the I2C hardware
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* @mode: operation mode - DW_IC_MASTER or DW_IC_SLAVE
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*
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* HCNT and LCNT parameters can be used if the platform knows more accurate
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* values than the one computed based only on the input clock frequency.
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* Leave them to be %0 if not used.
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*/
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struct dw_i2c_dev {
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struct device *dev;
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void __iomem *base;
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struct completion cmd_complete;
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struct clk *clk;
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struct reset_control *rst;
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struct i2c_client *slave;
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u32 (*get_clk_rate_khz) (struct dw_i2c_dev *dev);
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struct dw_pci_controller *controller;
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int cmd_err;
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struct i2c_msg *msgs;
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int msgs_num;
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int msg_write_idx;
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u32 tx_buf_len;
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u8 *tx_buf;
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int msg_read_idx;
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u32 rx_buf_len;
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u8 *rx_buf;
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int msg_err;
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unsigned int status;
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u32 abort_source;
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int irq;
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u32 flags;
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struct i2c_adapter adapter;
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u32 functionality;
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u32 master_cfg;
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u32 slave_cfg;
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unsigned int tx_fifo_depth;
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unsigned int rx_fifo_depth;
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int rx_outstanding;
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u32 clk_freq;
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u32 sda_hold_time;
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u32 sda_falling_time;
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u32 scl_falling_time;
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u16 ss_hcnt;
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u16 ss_lcnt;
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u16 fs_hcnt;
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u16 fs_lcnt;
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u16 fp_hcnt;
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u16 fp_lcnt;
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u16 hs_hcnt;
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u16 hs_lcnt;
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struct pm_qos_request pm_qos;
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int (*acquire_lock)(struct dw_i2c_dev *dev);
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void (*release_lock)(struct dw_i2c_dev *dev);
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bool pm_disabled;
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bool suspended;
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bool skip_resume;
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void (*disable)(struct dw_i2c_dev *dev);
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void (*disable_int)(struct dw_i2c_dev *dev);
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int (*init)(struct dw_i2c_dev *dev);
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int mode;
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};
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#define ACCESS_SWAP 0x00000001
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#define ACCESS_16BIT 0x00000002
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#define ACCESS_INTR_MASK 0x00000004
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#define MODEL_CHERRYTRAIL 0x00000100
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u32 dw_readl(struct dw_i2c_dev *dev, int offset);
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void dw_writel(struct dw_i2c_dev *dev, u32 b, int offset);
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u32 i2c_dw_scl_hcnt(u32 ic_clk, u32 tSYMBOL, u32 tf, int cond, int offset);
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u32 i2c_dw_scl_lcnt(u32 ic_clk, u32 tLOW, u32 tf, int offset);
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void __i2c_dw_enable(struct dw_i2c_dev *dev, bool enable);
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void __i2c_dw_enable_and_wait(struct dw_i2c_dev *dev, bool enable);
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unsigned long i2c_dw_clk_rate(struct dw_i2c_dev *dev);
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int i2c_dw_acquire_lock(struct dw_i2c_dev *dev);
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void i2c_dw_release_lock(struct dw_i2c_dev *dev);
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int i2c_dw_wait_bus_not_busy(struct dw_i2c_dev *dev);
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int i2c_dw_handle_tx_abort(struct dw_i2c_dev *dev);
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u32 i2c_dw_func(struct i2c_adapter *adap);
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void i2c_dw_disable(struct dw_i2c_dev *dev);
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void i2c_dw_disable_int(struct dw_i2c_dev *dev);
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extern u32 i2c_dw_read_comp_param(struct dw_i2c_dev *dev);
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extern int i2c_dw_probe(struct dw_i2c_dev *dev);
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#if IS_ENABLED(CONFIG_I2C_DESIGNWARE_SLAVE)
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extern int i2c_dw_probe_slave(struct dw_i2c_dev *dev);
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#else
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static inline int i2c_dw_probe_slave(struct dw_i2c_dev *dev) { return -EINVAL; }
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#endif
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#if IS_ENABLED(CONFIG_I2C_DESIGNWARE_BAYTRAIL)
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extern int i2c_dw_probe_lock_support(struct dw_i2c_dev *dev);
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extern void i2c_dw_remove_lock_support(struct dw_i2c_dev *dev);
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#else
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static inline int i2c_dw_probe_lock_support(struct dw_i2c_dev *dev) { return 0; }
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static inline void i2c_dw_remove_lock_support(struct dw_i2c_dev *dev) {}
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#endif
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