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/*
* Synopsys DesignWare I2C adapter driver (master only).
*
* Based on the TI DAVINCI I2C adapter driver.
*
* Copyright (C) 2006 Texas Instruments.
* Copyright (C) 2007 MontaVista Software Inc.
* Copyright (C) 2009 Provigent Ltd.
*
* ----------------------------------------------------------------------------
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* ----------------------------------------------------------------------------
*
*/
#include <linux/i2c.h>
#include <linux/pm_qos.h>
#define DW_IC_DEFAULT_FUNCTIONALITY (I2C_FUNC_I2C | \
I2C_FUNC_SMBUS_BYTE | \
I2C_FUNC_SMBUS_BYTE_DATA | \
I2C_FUNC_SMBUS_WORD_DATA | \
I2C_FUNC_SMBUS_BLOCK_DATA | \
I2C_FUNC_SMBUS_I2C_BLOCK)
#define DW_IC_CON_MASTER 0x1
#define DW_IC_CON_SPEED_STD 0x2
#define DW_IC_CON_SPEED_FAST 0x4
#define DW_IC_CON_SPEED_HIGH 0x6
#define DW_IC_CON_SPEED_MASK 0x6
#define DW_IC_CON_10BITADDR_MASTER 0x10
#define DW_IC_CON_RESTART_EN 0x20
#define DW_IC_CON_SLAVE_DISABLE 0x40
/**
* struct dw_i2c_dev - private i2c-designware data
* @dev: driver model device node
* @base: IO registers pointer
* @cmd_complete: tx completion indicator
* @clk: input reference clock
* @cmd_err: run time hadware error code
* @msgs: points to an array of messages currently being transfered
* @msgs_num: the number of elements in msgs
* @msg_write_idx: the element index of the current tx message in the msgs
* array
* @tx_buf_len: the length of the current tx buffer
* @tx_buf: the current tx buffer
* @msg_read_idx: the element index of the current rx message in the msgs
* array
* @rx_buf_len: the length of the current rx buffer
* @rx_buf: the current rx buffer
* @msg_err: error status of the current transfer
* @status: i2c master status, one of STATUS_*
* @abort_source: copy of the TX_ABRT_SOURCE register
* @irq: interrupt number for the i2c master
* @adapter: i2c subsystem adapter node
* @tx_fifo_depth: depth of the hardware tx fifo
* @rx_fifo_depth: depth of the hardware rx fifo
* @rx_outstanding: current master-rx elements in tx fifo
* @clk_freq: bus clock frequency
* @ss_hcnt: standard speed HCNT value
* @ss_lcnt: standard speed LCNT value
* @fs_hcnt: fast speed HCNT value
* @fs_lcnt: fast speed LCNT value
* @fp_hcnt: fast plus HCNT value
* @fp_lcnt: fast plus LCNT value
* @hs_hcnt: high speed HCNT value
* @hs_lcnt: high speed LCNT value
* @pm_qos: pm_qos_request used while holding a hardware lock on the bus
* @acquire_lock: function to acquire a hardware lock on the bus
* @release_lock: function to release a hardware lock on the bus
* @pm_disabled: true if power-management should be disabled for this i2c-bus
*
* HCNT and LCNT parameters can be used if the platform knows more accurate
* values than the one computed based only on the input clock frequency.
* Leave them to be %0 if not used.
*/
struct dw_i2c_dev {
struct device *dev;
void __iomem *base;
struct completion cmd_complete;
struct clk *clk;
struct reset_control *rst;
u32 (*get_clk_rate_khz) (struct dw_i2c_dev *dev);
struct dw_pci_controller *controller;
int cmd_err;
struct i2c_msg *msgs;
int msgs_num;
int msg_write_idx;
u32 tx_buf_len;
u8 *tx_buf;
int msg_read_idx;
u32 rx_buf_len;
u8 *rx_buf;
int msg_err;
unsigned int status;
u32 abort_source;
int irq;
u32 flags;
struct i2c_adapter adapter;
u32 functionality;
u32 master_cfg;
unsigned int tx_fifo_depth;
unsigned int rx_fifo_depth;
int rx_outstanding;
u32 clk_freq;
u32 sda_hold_time;
u32 sda_falling_time;
u32 scl_falling_time;
u16 ss_hcnt;
u16 ss_lcnt;
u16 fs_hcnt;
u16 fs_lcnt;
u16 fp_hcnt;
u16 fp_lcnt;
u16 hs_hcnt;
u16 hs_lcnt;
struct pm_qos_request pm_qos;
int (*acquire_lock)(struct dw_i2c_dev *dev);
void (*release_lock)(struct dw_i2c_dev *dev);
bool pm_disabled;
};
#define ACCESS_SWAP 0x00000001
#define ACCESS_16BIT 0x00000002
#define ACCESS_INTR_MASK 0x00000004
#define MODEL_CHERRYTRAIL 0x00000100
extern int i2c_dw_init(struct dw_i2c_dev *dev);
extern void i2c_dw_disable(struct dw_i2c_dev *dev);
extern void i2c_dw_disable_int(struct dw_i2c_dev *dev);
extern u32 i2c_dw_read_comp_param(struct dw_i2c_dev *dev);
extern int i2c_dw_probe(struct dw_i2c_dev *dev);
#if IS_ENABLED(CONFIG_I2C_DESIGNWARE_BAYTRAIL)
extern int i2c_dw_probe_lock_support(struct dw_i2c_dev *dev);
extern void i2c_dw_remove_lock_support(struct dw_i2c_dev *dev);
#else
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) {}
#endif
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