2011-10-29 17:57:23 +08:00
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/*
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* Synopsys DesignWare I2C adapter driver (master only).
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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 18:43:20 +08:00
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#include <linux/i2c.h>
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2017-02-10 18:27:56 +08:00
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#include <linux/pm_qos.h>
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2016-11-21 18:43:20 +08:00
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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 17:57:23 +08:00
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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 22:02:51 +08:00
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#define DW_IC_CON_SPEED_HIGH 0x6
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2016-06-15 23:05:05 +08:00
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#define DW_IC_CON_SPEED_MASK 0x6
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2011-10-29 17:57:23 +08:00
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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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/**
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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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* @cmd_err: run time hadware error code
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2017-06-14 18:43:21 +08:00
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* @msgs: points to an array of messages currently being transferred
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2011-10-29 17:57:23 +08:00
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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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* @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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2013-04-20 00:28:10 +08:00
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* @rx_outstanding: current master-rx elements in tx fifo
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2016-08-12 22:02:47 +08:00
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* @clk_freq: bus clock frequency
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2013-08-19 20:07:53 +08:00
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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 22:02:48 +08:00
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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 18:27:56 +08:00
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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 17:12:16 +08:00
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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 06:25:09 +08:00
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* @pm_disabled: true if power-management should be disabled for this i2c-bus
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2013-08-19 20:07:53 +08:00
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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 17:57:23 +08:00
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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 22:22:40 +08:00
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struct reset_control *rst;
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2011-10-07 02:26:30 +08:00
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u32 (*get_clk_rate_khz) (struct dw_i2c_dev *dev);
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2011-10-07 02:26:35 +08:00
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struct dw_pci_controller *controller;
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2011-10-29 17:57:23 +08:00
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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;
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2017-02-10 18:27:53 +08:00
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u32 flags;
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2011-10-29 17:57:23 +08:00
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struct i2c_adapter adapter;
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2011-10-07 02:26:31 +08:00
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u32 functionality;
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2011-10-07 02:26:32 +08:00
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u32 master_cfg;
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2011-10-29 17:57:23 +08:00
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unsigned int tx_fifo_depth;
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unsigned int rx_fifo_depth;
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2013-04-20 00:28:10 +08:00
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int rx_outstanding;
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2016-08-12 22:02:47 +08:00
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u32 clk_freq;
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2013-06-26 16:55:06 +08:00
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u32 sda_hold_time;
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2014-01-21 00:43:43 +08:00
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u32 sda_falling_time;
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u32 scl_falling_time;
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2013-08-19 20:07:53 +08:00
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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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2016-08-12 22:02:48 +08:00
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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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2017-02-10 18:27:56 +08:00
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struct pm_qos_request pm_qos;
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2015-01-15 17:12:16 +08:00
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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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2017-03-14 06:25:09 +08:00
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bool pm_disabled;
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2011-10-29 17:57:23 +08:00
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};
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2012-04-18 21:01:41 +08:00
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#define ACCESS_SWAP 0x00000001
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#define ACCESS_16BIT 0x00000002
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2015-12-11 20:02:53 +08:00
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#define ACCESS_INTR_MASK 0x00000004
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2012-04-18 21:01:41 +08:00
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2017-02-10 18:27:58 +08:00
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#define MODEL_CHERRYTRAIL 0x00000100
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2011-10-29 17:57:23 +08:00
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extern int i2c_dw_init(struct dw_i2c_dev *dev);
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2011-10-07 02:26:34 +08:00
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extern void i2c_dw_disable(struct dw_i2c_dev *dev);
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extern 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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2015-10-12 21:55:35 +08:00
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extern int i2c_dw_probe(struct dw_i2c_dev *dev);
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2015-01-15 17:12:17 +08:00
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#if IS_ENABLED(CONFIG_I2C_DESIGNWARE_BAYTRAIL)
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2017-02-10 18:27:56 +08:00
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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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2015-01-15 17:12:17 +08:00
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#else
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2017-02-10 18:27:56 +08:00
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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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2015-01-15 17:12:17 +08:00
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#endif
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