2011-10-29 16:57:23 +07:00
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/*
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2017-06-14 17:43:24 +07:00
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* Synopsys DesignWare I2C adapter driver.
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2011-10-29 16:57:23 +07:00
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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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2016-11-21 17:43:20 +07:00
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#include <linux/i2c.h>
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2017-02-10 17:27:56 +07:00
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#include <linux/pm_qos.h>
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2016-11-21 17:43:20 +07:00
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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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2011-10-29 16:57:23 +07:00
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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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2016-08-12 21:02:51 +07:00
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#define DW_IC_CON_SPEED_HIGH 0x6
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2016-06-15 22:05:05 +07:00
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#define DW_IC_CON_SPEED_MASK 0x6
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2017-06-14 17:43:24 +07:00
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#define DW_IC_CON_10BITADDR_SLAVE 0x8
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2011-10-29 16:57:23 +07:00
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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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2017-06-14 17:43:24 +07:00
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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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2011-10-29 16:57:23 +07:00
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2017-06-14 17:43:23 +07:00
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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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2017-06-14 17:43:24 +07:00
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#define DW_IC_SAR 0x8
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2017-06-14 17:43:23 +07:00
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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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2017-06-14 17:43:24 +07:00
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#define DW_IC_CLR_RESTART_DET 0xa8
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2017-06-14 17:43:23 +07:00
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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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2017-06-14 17:43:24 +07:00
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#define DW_IC_INTR_RESTART_DET 0x1000
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2017-06-14 17:43:23 +07:00
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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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2017-06-14 17:43:24 +07:00
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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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2017-06-14 17:43:23 +07:00
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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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2017-06-14 17:43:24 +07:00
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#define DW_IC_STATUS_SLAVE_ACTIVITY BIT(6)
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2017-06-14 17:43:23 +07:00
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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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2017-06-14 17:43:24 +07:00
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* status codes
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2017-06-14 17:43:23 +07:00
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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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2017-06-14 17:43:24 +07:00
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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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2017-06-14 17:43:23 +07:00
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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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2017-06-14 17:43:24 +07:00
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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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2017-06-14 17:43:23 +07:00
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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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2017-06-14 17:43:24 +07:00
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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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2017-06-14 17:43:23 +07:00
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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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2011-10-29 16:57:23 +07:00
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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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2017-06-14 17:43:24 +07:00
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* @slave: represent an I2C slave device
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2011-10-29 16:57:23 +07:00
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* @cmd_err: run time hadware error code
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2017-06-14 17:43:21 +07:00
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* @msgs: points to an array of messages currently being transferred
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2011-10-29 16:57:23 +07:00
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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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2017-06-14 17:43:24 +07:00
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* @slave_cfg: configuration for the slave device
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2011-10-29 16:57:23 +07:00
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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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2013-04-19 23:28:10 +07:00
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* @rx_outstanding: current master-rx elements in tx fifo
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2016-08-12 21:02:47 +07:00
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* @clk_freq: bus clock frequency
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2013-08-19 19:07:53 +07:00
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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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2016-08-12 21:02:48 +07:00
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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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2017-02-10 17:27:56 +07:00
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* @pm_qos: pm_qos_request used while holding a hardware lock on the bus
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2015-01-15 16:12:16 +07:00
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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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2017-03-14 05:25:09 +07:00
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* @pm_disabled: true if power-management should be disabled for this i2c-bus
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2017-06-14 17:43:23 +07:00
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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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2017-06-22 17:17:33 +07:00
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* @mode: operation mode - DW_IC_MASTER or DW_IC_SLAVE
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2013-08-19 19:07:53 +07:00
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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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2011-10-29 16:57:23 +07:00
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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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2016-12-27 21:22:40 +07:00
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struct reset_control *rst;
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2017-06-14 17:43:24 +07:00
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struct i2c_client *slave;
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2011-10-07 01:26:30 +07:00
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u32 (*get_clk_rate_khz) (struct dw_i2c_dev *dev);
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2011-10-07 01:26:35 +07:00
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struct dw_pci_controller *controller;
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2011-10-29 16:57:23 +07:00
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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;
|
2017-02-10 17:27:53 +07:00
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|
|
u32 flags;
|
2011-10-29 16:57:23 +07:00
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struct i2c_adapter adapter;
|
2011-10-07 01:26:31 +07:00
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u32 functionality;
|
2011-10-07 01:26:32 +07:00
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u32 master_cfg;
|
2017-06-14 17:43:24 +07:00
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|
u32 slave_cfg;
|
2011-10-29 16:57:23 +07:00
|
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unsigned int tx_fifo_depth;
|
|
|
|
|
unsigned int rx_fifo_depth;
|
2013-04-19 23:28:10 +07:00
|
|
|
int rx_outstanding;
|
2016-08-12 21:02:47 +07:00
|
|
|
u32 clk_freq;
|
2013-06-26 15:55:06 +07:00
|
|
|
u32 sda_hold_time;
|
2014-01-20 23:43:43 +07:00
|
|
|
u32 sda_falling_time;
|
|
|
|
|
u32 scl_falling_time;
|
2013-08-19 19:07:53 +07:00
|
|
|
u16 ss_hcnt;
|
|
|
|
|
u16 ss_lcnt;
|
|
|
|
|
u16 fs_hcnt;
|
|
|
|
|
u16 fs_lcnt;
|
2016-08-12 21:02:48 +07:00
|
|
|
u16 fp_hcnt;
|
|
|
|
|
u16 fp_lcnt;
|
|
|
|
|
u16 hs_hcnt;
|
|
|
|
|
u16 hs_lcnt;
|
2017-02-10 17:27:56 +07:00
|
|
|
struct pm_qos_request pm_qos;
|
2015-01-15 16:12:16 +07:00
|
|
|
int (*acquire_lock)(struct dw_i2c_dev *dev);
|
|
|
|
|
void (*release_lock)(struct dw_i2c_dev *dev);
|
2017-03-14 05:25:09 +07:00
|
|
|
bool pm_disabled;
|
PM: i2c-designware-platdrv: Suspend/resume at the late/early stages
As reported by Rajat Jain, there are problems when ACPI operation
region handlers or similar, called at the ->resume_early() time, for
I2C client devices try to access an I2C controller that has already
been suspended at that point. To avoid that, move the suspend/resume
of i2c-designware-platdrv to the late/early stages, respectively.
While at it, avoid resuming the device from runtime suspend in the
driver's ->suspend callback which isn't particularly nice. [A better
approach would be to make the driver track the PM state of the device
so that it doesn't need to resume it in ->suspend, so implement it.]
First, drop dw_i2c_plat_suspend() added by commit a23318feeff6 (i2c:
designware: Fix system suspend) and rename dw_i2c_plat_runtime_suspend()
back to dw_i2c_plat_suspend().
Second, point the driver's ->late_suspend and ->early_resume
callbacks, rather than its ->suspend and ->resume callbacks,
to dw_i2c_plat_suspend() and dw_i2c_plat_resume(), respectively,
so that they are not executed in parallel with each other, for
example if runtime resume of the device takes place during system
suspend.
Finally, add "suspended" and "skip_resume" flags to struct dw_i2c_dev
and make dw_i2c_plat_suspend() and dw_i2c_plat_resume() use them to
avoid suspending or resuming the device twice in a row and to avoid
resuming a previously runtime-suspended device during system resume.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Tested-by: Johannes Stezenbach <js@sig21.net>
Tested-by: Rajat Jain <rajatja@google.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2017-09-25 06:30:51 +07:00
|
|
|
bool suspended;
|
|
|
|
|
bool skip_resume;
|
2017-06-14 17:43:23 +07:00
|
|
|
void (*disable)(struct dw_i2c_dev *dev);
|
|
|
|
|
void (*disable_int)(struct dw_i2c_dev *dev);
|
|
|
|
|
int (*init)(struct dw_i2c_dev *dev);
|
2017-06-22 17:17:33 +07:00
|
|
|
int mode;
|
2011-10-29 16:57:23 +07:00
|
|
|
};
|
|
|
|
|
|
2012-04-18 20:01:41 +07:00
|
|
|
#define ACCESS_SWAP 0x00000001
|
|
|
|
|
#define ACCESS_16BIT 0x00000002
|
2015-12-11 19:02:53 +07:00
|
|
|
#define ACCESS_INTR_MASK 0x00000004
|
2012-04-18 20:01:41 +07:00
|
|
|
|
2017-02-10 17:27:58 +07:00
|
|
|
#define MODEL_CHERRYTRAIL 0x00000100
|
|
|
|
|
|
2017-06-14 17:43:23 +07:00
|
|
|
u32 dw_readl(struct dw_i2c_dev *dev, int offset);
|
|
|
|
|
void dw_writel(struct dw_i2c_dev *dev, u32 b, int offset);
|
|
|
|
|
u32 i2c_dw_scl_hcnt(u32 ic_clk, u32 tSYMBOL, u32 tf, int cond, int offset);
|
|
|
|
|
u32 i2c_dw_scl_lcnt(u32 ic_clk, u32 tLOW, u32 tf, int offset);
|
|
|
|
|
void __i2c_dw_enable(struct dw_i2c_dev *dev, bool enable);
|
|
|
|
|
void __i2c_dw_enable_and_wait(struct dw_i2c_dev *dev, bool enable);
|
|
|
|
|
unsigned long i2c_dw_clk_rate(struct dw_i2c_dev *dev);
|
|
|
|
|
int i2c_dw_acquire_lock(struct dw_i2c_dev *dev);
|
|
|
|
|
void i2c_dw_release_lock(struct dw_i2c_dev *dev);
|
|
|
|
|
int i2c_dw_wait_bus_not_busy(struct dw_i2c_dev *dev);
|
|
|
|
|
int i2c_dw_handle_tx_abort(struct dw_i2c_dev *dev);
|
|
|
|
|
u32 i2c_dw_func(struct i2c_adapter *adap);
|
|
|
|
|
void i2c_dw_disable(struct dw_i2c_dev *dev);
|
|
|
|
|
void i2c_dw_disable_int(struct dw_i2c_dev *dev);
|
|
|
|
|
|
2011-10-07 01:26:34 +07:00
|
|
|
extern u32 i2c_dw_read_comp_param(struct dw_i2c_dev *dev);
|
2015-10-12 20:55:35 +07:00
|
|
|
extern int i2c_dw_probe(struct dw_i2c_dev *dev);
|
2017-06-28 21:23:29 +07:00
|
|
|
#if IS_ENABLED(CONFIG_I2C_DESIGNWARE_SLAVE)
|
2017-06-22 17:17:32 +07:00
|
|
|
extern int i2c_dw_probe_slave(struct dw_i2c_dev *dev);
|
2017-06-28 21:23:29 +07:00
|
|
|
#else
|
|
|
|
|
static inline int i2c_dw_probe_slave(struct dw_i2c_dev *dev) { return -EINVAL; }
|
|
|
|
|
#endif
|
2015-01-15 16:12:17 +07:00
|
|
|
|
|
|
|
|
#if IS_ENABLED(CONFIG_I2C_DESIGNWARE_BAYTRAIL)
|
2017-02-10 17:27:56 +07:00
|
|
|
extern int i2c_dw_probe_lock_support(struct dw_i2c_dev *dev);
|
|
|
|
|
extern void i2c_dw_remove_lock_support(struct dw_i2c_dev *dev);
|
2015-01-15 16:12:17 +07:00
|
|
|
#else
|
2017-02-10 17:27:56 +07:00
|
|
|
static inline int i2c_dw_probe_lock_support(struct dw_i2c_dev *dev) { return 0; }
|
|
|
|
|
static inline void i2c_dw_remove_lock_support(struct dw_i2c_dev *dev) {}
|
2015-01-15 16:12:17 +07:00
|
|
|
#endif
|