/* 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/compiler_types.h> #include <linux/completion.h> #include <linux/dev_printk.h> #include <linux/errno.h> #include <linux/i2c.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 0x00 #define DW_IC_TAR 0x04 #define DW_IC_SAR 0x08 #define DW_IC_DATA_CMD 0x10 #define DW_IC_SS_SCL_HCNT 0x14 #define DW_IC_SS_SCL_LCNT 0x18 #define DW_IC_FS_SCL_HCNT 0x1c #define DW_IC_FS_SCL_LCNT 0x20 #define DW_IC_HS_SCL_HCNT 0x24 #define DW_IC_HS_SCL_LCNT 0x28 #define DW_IC_INTR_STAT 0x2c #define DW_IC_INTR_MASK 0x30 #define DW_IC_RAW_INTR_STAT 0x34 #define DW_IC_RX_TL 0x38 #define DW_IC_TX_TL 0x3c #define DW_IC_CLR_INTR 0x40 #define DW_IC_CLR_RX_UNDER 0x44 #define DW_IC_CLR_RX_OVER 0x48 #define DW_IC_CLR_TX_OVER 0x4c #define DW_IC_CLR_RD_REQ 0x50 #define DW_IC_CLR_TX_ABRT 0x54 #define DW_IC_CLR_RX_DONE 0x58 #define DW_IC_CLR_ACTIVITY 0x5c #define DW_IC_CLR_STOP_DET 0x60 #define DW_IC_CLR_START_DET 0x64 #define DW_IC_CLR_GEN_CALL 0x68 #define DW_IC_ENABLE 0x6c #define DW_IC_STATUS 0x70 #define DW_IC_TXFLR 0x74 #define DW_IC_RXFLR 0x78 #define DW_IC_SDA_HOLD 0x7c #define DW_IC_TX_ABRT_SOURCE 0x80 #define DW_IC_ENABLE_STATUS 0x9c #define DW_IC_CLR_RESTART_DET 0xa8 #define DW_IC_COMP_PARAM_1 0xf4 #define DW_IC_COMP_VERSION 0xf8 #define DW_IC_SDA_HOLD_MIN_VERS 0x3131312A /* "111*" == v1.11* */ #define DW_IC_COMP_TYPE 0xfc #define DW_IC_COMP_TYPE_VALUE 0x44570140 /* "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_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_SDA_HOLD_RX_SHIFT 16 #define DW_IC_SDA_HOLD_RX_MASK GENMASK(23, 16) #define DW_IC_ERR_TX_ABRT 0x1 #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 hadware 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 * @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 SoCs PUNIT * @disable: function to disable the controller * @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: I²C GPIO recovery information * * 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; 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; void (*disable)(struct dw_i2c_dev *dev); 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; }; #define ACCESS_INTR_MASK BIT(0) #define ACCESS_NO_IRQ_SUSPEND BIT(1) #define ARBITRATION_SEMAPHORE BIT(2) #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 0xd at register * offset 0x474 specified in hardware specification. */ #define AMD_UCSI_INTR_REG 0x474 #define AMD_UCSI_INTR_EN 0xd #define TXGBE_TX_FIFO_DEPTH 4 #define TXGBE_RX_FIFO_DEPTH 0 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(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); 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); void i2c_dw_disable(struct dw_i2c_dev *dev); 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; } 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 int i2c_dw_probe(struct dw_i2c_dev *dev) { switch (dev->mode) { case DW_IC_SLAVE: return i2c_dw_probe_slave(dev); case DW_IC_MASTER: return i2c_dw_probe_master(dev); default: dev_err(dev->dev, "Wrong operation mode: %d\n", dev->mode); return -EINVAL; } } 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); } #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_validate_speed(struct dw_i2c_dev *dev); void i2c_dw_adjust_bus_speed(struct dw_i2c_dev *dev); #if IS_ENABLED(CONFIG_ACPI) int i2c_dw_acpi_configure(struct device *device); #else static inline int i2c_dw_acpi_configure(struct device *device) { return -ENODEV; } #endif