/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Synopsys DesignWare I2C adapter driver .
*
* Based on the TI DAVINCI I2C adapter driver .
*
* Copyright ( C ) 2006 Texas Instruments .
* Copyright ( C ) 2007 MontaVista Software Inc .
* Copyright ( C ) 2009 Provigent Ltd .
*/
#include <linux/bits.h>
#include <linux/completion.h>
#include <linux/errno.h>
#include <linux/i2c.h>
#include <linux/pm.h>
#include <linux/regmap.h>
#include <linux/types.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 BIT(0 )
#define DW_IC_CON_SPEED_STD (1 << 1 )
#define DW_IC_CON_SPEED_FAST (2 << 1 )
#define DW_IC_CON_SPEED_HIGH (3 << 1 )
#define DW_IC_CON_SPEED_MASK GENMASK(2 , 1 )
#define DW_IC_CON_10BITADDR_SLAVE BIT(3 )
#define DW_IC_CON_10BITADDR_MASTER BIT(4 )
#define DW_IC_CON_RESTART_EN BIT(5 )
#define DW_IC_CON_SLAVE_DISABLE BIT(6 )
#define DW_IC_CON_STOP_DET_IFADDRESSED BIT(7 )
#define DW_IC_CON_TX_EMPTY_CTRL BIT(8 )
#define DW_IC_CON_RX_FIFO_FULL_HLD_CTRL BIT(9 )
#define DW_IC_CON_BUS_CLEAR_CTRL BIT(11 )
#define DW_IC_DATA_CMD_DAT GENMASK(7 , 0 )
#define DW_IC_DATA_CMD_FIRST_DATA_BYTE BIT(11 )
/*
* Registers offset
*/
#define DW_IC_CON 0 x00
#define DW_IC_TAR 0 x04
#define DW_IC_SAR 0 x08
#define DW_IC_DATA_CMD 0 x10
#define DW_IC_SS_SCL_HCNT 0 x14
#define DW_IC_SS_SCL_LCNT 0 x18
#define DW_IC_FS_SCL_HCNT 0 x1c
#define DW_IC_FS_SCL_LCNT 0 x20
#define DW_IC_HS_SCL_HCNT 0 x24
#define DW_IC_HS_SCL_LCNT 0 x28
#define DW_IC_INTR_STAT 0 x2c
#define DW_IC_INTR_MASK 0 x30
#define DW_IC_RAW_INTR_STAT 0 x34
#define DW_IC_RX_TL 0 x38
#define DW_IC_TX_TL 0 x3c
#define DW_IC_CLR_INTR 0 x40
#define DW_IC_CLR_RX_UNDER 0 x44
#define DW_IC_CLR_RX_OVER 0 x48
#define DW_IC_CLR_TX_OVER 0 x4c
#define DW_IC_CLR_RD_REQ 0 x50
#define DW_IC_CLR_TX_ABRT 0 x54
#define DW_IC_CLR_RX_DONE 0 x58
#define DW_IC_CLR_ACTIVITY 0 x5c
#define DW_IC_CLR_STOP_DET 0 x60
#define DW_IC_CLR_START_DET 0 x64
#define DW_IC_CLR_GEN_CALL 0 x68
#define DW_IC_ENABLE 0 x6c
#define DW_IC_STATUS 0 x70
#define DW_IC_TXFLR 0 x74
#define DW_IC_RXFLR 0 x78
#define DW_IC_SDA_HOLD 0 x7c
#define DW_IC_TX_ABRT_SOURCE 0 x80
#define DW_IC_ENABLE_STATUS 0 x9c
#define DW_IC_CLR_RESTART_DET 0 xa8
#define DW_IC_COMP_PARAM_1 0 xf4
#define DW_IC_COMP_VERSION 0 xf8
#define DW_IC_SDA_HOLD_MIN_VERS 0 x3131312A /* "111*" == v1.11* */
#define DW_IC_COMP_TYPE 0 xfc
#define DW_IC_COMP_TYPE_VALUE 0 x44570140 /* "DW" + 0x0140 */
#define DW_IC_INTR_RX_UNDER BIT(0 )
#define DW_IC_INTR_RX_OVER BIT(1 )
#define DW_IC_INTR_RX_FULL BIT(2 )
#define DW_IC_INTR_TX_OVER BIT(3 )
#define DW_IC_INTR_TX_EMPTY BIT(4 )
#define DW_IC_INTR_RD_REQ BIT(5 )
#define DW_IC_INTR_TX_ABRT BIT(6 )
#define DW_IC_INTR_RX_DONE BIT(7 )
#define DW_IC_INTR_ACTIVITY BIT(8 )
#define DW_IC_INTR_STOP_DET BIT(9 )
#define DW_IC_INTR_START_DET BIT(10 )
#define DW_IC_INTR_GEN_CALL BIT(11 )
#define DW_IC_INTR_RESTART_DET BIT(12 )
#define DW_IC_INTR_MST_ON_HOLD BIT(13 )
#define DW_IC_INTR_DEFAULT_MASK (DW_IC_INTR_RX_FULL | \
DW_IC_INTR_TX_ABRT | \
DW_IC_INTR_STOP_DET)
#define DW_IC_INTR_MASTER_MASK (DW_IC_INTR_DEFAULT_MASK | \
DW_IC_INTR_TX_EMPTY)
#define DW_IC_INTR_SLAVE_MASK (DW_IC_INTR_DEFAULT_MASK | \
DW_IC_INTR_RX_UNDER | \
DW_IC_INTR_RD_REQ)
#define DW_IC_ENABLE_ENABLE BIT(0 )
#define DW_IC_ENABLE_ABORT BIT(1 )
#define DW_IC_STATUS_ACTIVITY BIT(0 )
#define DW_IC_STATUS_TFE BIT(2 )
#define DW_IC_STATUS_RFNE BIT(3 )
#define DW_IC_STATUS_MASTER_ACTIVITY BIT(5 )
#define DW_IC_STATUS_SLAVE_ACTIVITY BIT(6 )
#define DW_IC_STATUS_MASTER_HOLD_TX_FIFO_EMPTY BIT(7 )
#define DW_IC_SDA_HOLD_RX_SHIFT 16
#define DW_IC_SDA_HOLD_RX_MASK GENMASK(23 , 16 )
#define DW_IC_ERR_TX_ABRT 0 x1
#define DW_IC_TAR_10BITADDR_MASTER BIT(12 )
#define DW_IC_COMP_PARAM_1_SPEED_MODE_HIGH (BIT(2 ) | BIT(3 ))
#define DW_IC_COMP_PARAM_1_SPEED_MODE_MASK GENMASK(3 , 2 )
/*
* Sofware status flags
*/
#define STATUS_ACTIVE BIT(0 )
#define STATUS_WRITE_IN_PROGRESS BIT(1 )
#define STATUS_READ_IN_PROGRESS BIT(2 )
#define STATUS_MASK GENMASK(2 , 0 )
/*
* operation modes
*/
#define DW_IC_MASTER 0
#define DW_IC_SLAVE 1
/*
* Hardware abort codes from the DW_IC_TX_ABRT_SOURCE register .
*
* Only expected abort codes are listed here ,
* refer to the datasheet for the full list .
*/
#define ABRT_7B_ADDR_NOACK 0
#define ABRT_10ADDR1_NOACK 1
#define ABRT_10ADDR2_NOACK 2
#define ABRT_TXDATA_NOACK 3
#define ABRT_GCALL_NOACK 4
#define ABRT_GCALL_READ 5
#define ABRT_SBYTE_ACKDET 7
#define ABRT_SBYTE_NORSTRT 9
#define ABRT_10B_RD_NORSTRT 10
#define ABRT_MASTER_DIS 11
#define ARB_LOST 12
#define ABRT_SLAVE_FLUSH_TXFIFO 13
#define ABRT_SLAVE_ARBLOST 14
#define ABRT_SLAVE_RD_INTX 15
#define DW_IC_TX_ABRT_7B_ADDR_NOACK BIT(ABRT_7B_ADDR_NOACK)
#define DW_IC_TX_ABRT_10ADDR1_NOACK BIT(ABRT_10ADDR1_NOACK)
#define DW_IC_TX_ABRT_10ADDR2_NOACK BIT(ABRT_10ADDR2_NOACK)
#define DW_IC_TX_ABRT_TXDATA_NOACK BIT(ABRT_TXDATA_NOACK)
#define DW_IC_TX_ABRT_GCALL_NOACK BIT(ABRT_GCALL_NOACK)
#define DW_IC_TX_ABRT_GCALL_READ BIT(ABRT_GCALL_READ)
#define DW_IC_TX_ABRT_SBYTE_ACKDET BIT(ABRT_SBYTE_ACKDET)
#define DW_IC_TX_ABRT_SBYTE_NORSTRT BIT(ABRT_SBYTE_NORSTRT)
#define DW_IC_TX_ABRT_10B_RD_NORSTRT BIT(ABRT_10B_RD_NORSTRT)
#define DW_IC_TX_ABRT_MASTER_DIS BIT(ABRT_MASTER_DIS)
#define DW_IC_TX_ARB_LOST BIT(ARB_LOST)
#define DW_IC_RX_ABRT_SLAVE_RD_INTX BIT(ABRT_SLAVE_RD_INTX)
#define DW_IC_RX_ABRT_SLAVE_ARBLOST BIT(ABRT_SLAVE_ARBLOST)
#define DW_IC_RX_ABRT_SLAVE_FLUSH_TXFIFO BIT(ABRT_SLAVE_FLUSH_TXFIFO)
#define DW_IC_TX_ABRT_NOACK (DW_IC_TX_ABRT_7B_ADDR_NOACK | \
DW_IC_TX_ABRT_10ADDR1_NOACK | \
DW_IC_TX_ABRT_10ADDR2_NOACK | \
DW_IC_TX_ABRT_TXDATA_NOACK | \
DW_IC_TX_ABRT_GCALL_NOACK)
struct clk;
struct device;
struct reset_control;
/**
* struct dw_i2c_dev - private i2c - designware data
* @ dev : driver model device node
* @ map : IO registers map
* @ sysmap : System controller registers map
* @ base : IO registers pointer
* @ ext : Extended IO registers pointer
* @ cmd_complete : tx completion indicator
* @ clk : input reference clock
* @ pclk : clock required to access the registers
* @ rst : optional reset for the controller
* @ slave : represent an I2C slave device
* @ get_clk_rate_khz : callback to retrieve IP specific bus speed
* @ cmd_err : run time hardware error code
* @ msgs : points to an array of messages currently being transferred
* @ 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
* @ sw_mask : SW mask of DW_IC_INTR_MASK used in polling mode
* @ irq : interrupt number for the i2c master
* @ flags : platform specific flags like type of IO accessors or model
* @ adapter : i2c subsystem adapter node
* @ functionality : I2C_FUNC_ * ORed bits to reflect what controller does support
* @ master_cfg : configuration for the master device
* @ slave_cfg : configuration for the slave device
* @ 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
* @ timings : bus clock frequency , SDA hold and other timings
* @ sda_hold_time : SDA hold value
* @ 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
* @ acquire_lock : function to acquire a hardware lock on the bus
* @ release_lock : function to release a hardware lock on the bus
* @ semaphore_idx : Index of table with semaphore type attached to the bus . It ' s
* - 1 if there is no semaphore .
* @ shared_with_punit : true if this bus is shared with the SoC ' s PUNIT
* @ init : function to initialize the I2C hardware
* @ set_sda_hold_time : callback to retrieve IP specific SDA hold timing
* @ mode : operation mode - DW_IC_MASTER or DW_IC_SLAVE
* @ rinfo : I ² C GPIO recovery information
* @ bus_capacitance_pF : bus capacitance in picofarads
* @ clk_freq_optimized : if this value is true , it means the hardware reduces
* its internal clock frequency by reducing the internal latency required
* to generate the high period and low period of SCL line .
*
* 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;
struct regmap *map;
struct regmap *sysmap;
void __iomem *base;
void __iomem *ext;
struct completion cmd_complete;
struct clk *clk;
struct clk *pclk;
struct reset_control *rst;
struct i2c_client *slave;
u32 (*get_clk_rate_khz) (struct dw_i2c_dev *dev);
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;
unsigned int abort_source;
unsigned int sw_mask;
int irq;
u32 flags;
struct i2c_adapter adapter;
u32 functionality;
u32 master_cfg;
u32 slave_cfg;
unsigned int tx_fifo_depth;
unsigned int rx_fifo_depth;
int rx_outstanding;
struct i2c_timings timings;
u32 sda_hold_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;
int (*acquire_lock)(void );
void (*release_lock)(void );
int semaphore_idx;
bool shared_with_punit;
int (*init)(struct dw_i2c_dev *dev);
int (*set_sda_hold_time)(struct dw_i2c_dev *dev);
int mode;
struct i2c_bus_recovery_info rinfo;
u32 bus_capacitance_pF;
bool clk_freq_optimized;
};
#define ACCESS_INTR_MASK BIT(0 )
#define ACCESS_NO_IRQ_SUSPEND BIT(1 )
#define ARBITRATION_SEMAPHORE BIT(2 )
#define ACCESS_POLLING BIT(3 )
#define MODEL_MSCC_OCELOT BIT(8 )
#define MODEL_BAIKAL_BT1 BIT(9 )
#define MODEL_AMD_NAVI_GPU BIT(10 )
#define MODEL_WANGXUN_SP BIT(11 )
#define MODEL_MASK GENMASK(11 , 8 )
/*
* Enable UCSI interrupt by writing 0 xd at register
* offset 0 x474 specified in hardware specification .
*/
#define AMD_UCSI_INTR_REG 0 x474
#define AMD_UCSI_INTR_EN 0 xd
#define TXGBE_TX_FIFO_DEPTH 4
#define TXGBE_RX_FIFO_DEPTH 1
struct i2c_dw_semaphore_callbacks {
int (*probe)(struct dw_i2c_dev *dev);
void (*remove)(struct dw_i2c_dev *dev);
};
int i2c_dw_init_regmap(struct dw_i2c_dev *dev);
u32 i2c_dw_scl_hcnt(struct dw_i2c_dev *dev, unsigned int reg, u32 ic_clk,
u32 tSYMBOL, u32 tf, int offset);
u32 i2c_dw_scl_lcnt(struct dw_i2c_dev *dev, unsigned int reg, u32 ic_clk,
u32 tLOW, u32 tf, int offset);
int i2c_dw_set_sda_hold(struct dw_i2c_dev *dev);
u32 i2c_dw_clk_rate(struct dw_i2c_dev *dev);
int i2c_dw_prepare_clk(struct dw_i2c_dev *dev, bool prepare);
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);
int i2c_dw_set_fifo_size(struct dw_i2c_dev *dev);
u32 i2c_dw_func(struct i2c_adapter *adap);
extern const struct dev_pm_ops i2c_dw_dev_pm_ops;
static inline void __i2c_dw_enable(struct dw_i2c_dev *dev)
{
dev->status |= STATUS_ACTIVE;
regmap_write(dev->map, DW_IC_ENABLE, 1 );
}
static inline void __i2c_dw_disable_nowait(struct dw_i2c_dev *dev)
{
regmap_write(dev->map, DW_IC_ENABLE, 0 );
dev->status &= ~STATUS_ACTIVE;
}
static inline void __i2c_dw_write_intr_mask(struct dw_i2c_dev *dev,
unsigned int intr_mask)
{
unsigned int val = dev->flags & ACCESS_POLLING ? 0 : intr_mask;
regmap_write(dev->map, DW_IC_INTR_MASK, val);
dev->sw_mask = intr_mask;
}
static inline void __i2c_dw_read_intr_mask(struct dw_i2c_dev *dev,
unsigned int *intr_mask)
{
if (!(dev->flags & ACCESS_POLLING))
regmap_read(dev->map, DW_IC_INTR_MASK, intr_mask);
else
*intr_mask = dev->sw_mask;
}
void __i2c_dw_disable(struct dw_i2c_dev *dev);
void i2c_dw_disable(struct dw_i2c_dev *dev);
extern void i2c_dw_configure_master(struct dw_i2c_dev *dev);
extern int i2c_dw_probe_master(struct dw_i2c_dev *dev);
#if IS_ENABLED(CONFIG_I2C_DESIGNWARE_SLAVE)
extern void i2c_dw_configure_slave(struct dw_i2c_dev *dev);
extern int i2c_dw_probe_slave(struct dw_i2c_dev *dev);
#else
static inline void i2c_dw_configure_slave(struct dw_i2c_dev *dev) { }
static inline int i2c_dw_probe_slave(struct dw_i2c_dev *dev) { return -EINVAL; }
#endif
static inline void i2c_dw_configure(struct dw_i2c_dev *dev)
{
if (i2c_detect_slave_mode(dev->dev))
i2c_dw_configure_slave(dev);
else
i2c_dw_configure_master(dev);
}
int i2c_dw_probe(struct dw_i2c_dev *dev);
#if IS_ENABLED(CONFIG_I2C_DESIGNWARE_BAYTRAIL)
int i2c_dw_baytrail_probe_lock_support(struct dw_i2c_dev *dev);
#endif
#if IS_ENABLED(CONFIG_I2C_DESIGNWARE_AMDPSP)
int i2c_dw_amdpsp_probe_lock_support(struct dw_i2c_dev *dev);
#endif
int i2c_dw_fw_parse_and_configure(struct dw_i2c_dev *dev);
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