| /* 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/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_SLAVE 0x8 |
| #define DW_IC_CON_10BITADDR_MASTER 0x10 |
| #define DW_IC_CON_RESTART_EN 0x20 |
| #define DW_IC_CON_SLAVE_DISABLE 0x40 |
| #define DW_IC_CON_STOP_DET_IFADDRESSED 0x80 |
| #define DW_IC_CON_TX_EMPTY_CTRL 0x100 |
| #define DW_IC_CON_RX_FIFO_FULL_HLD_CTRL 0x200 |
| |
| /* |
| * Registers offset |
| */ |
| #define DW_IC_CON 0x0 |
| #define DW_IC_TAR 0x4 |
| #define DW_IC_SAR 0x8 |
| #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 |
| #define DW_IC_COMP_TYPE 0xfc |
| #define DW_IC_COMP_TYPE_VALUE 0x44570140 |
| |
| #define DW_IC_INTR_RX_UNDER 0x001 |
| #define DW_IC_INTR_RX_OVER 0x002 |
| #define DW_IC_INTR_RX_FULL 0x004 |
| #define DW_IC_INTR_TX_OVER 0x008 |
| #define DW_IC_INTR_TX_EMPTY 0x010 |
| #define DW_IC_INTR_RD_REQ 0x020 |
| #define DW_IC_INTR_TX_ABRT 0x040 |
| #define DW_IC_INTR_RX_DONE 0x080 |
| #define DW_IC_INTR_ACTIVITY 0x100 |
| #define DW_IC_INTR_STOP_DET 0x200 |
| #define DW_IC_INTR_START_DET 0x400 |
| #define DW_IC_INTR_GEN_CALL 0x800 |
| #define DW_IC_INTR_RESTART_DET 0x1000 |
| |
| #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_DONE | \ |
| DW_IC_INTR_RX_UNDER | \ |
| DW_IC_INTR_RD_REQ) |
| |
| #define DW_IC_STATUS_ACTIVITY 0x1 |
| #define DW_IC_STATUS_TFE BIT(2) |
| #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, DW_IC_SDA_HOLD_RX_SHIFT) |
| |
| #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) |
| |
| /* |
| * status codes |
| */ |
| #define STATUS_IDLE 0x0 |
| #define STATUS_WRITE_IN_PROGRESS 0x1 |
| #define STATUS_READ_IN_PROGRESS 0x2 |
| |
| #define TIMEOUT 20 /* ms */ |
| |
| /* |
| * 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 (1UL << ABRT_7B_ADDR_NOACK) |
| #define DW_IC_TX_ABRT_10ADDR1_NOACK (1UL << ABRT_10ADDR1_NOACK) |
| #define DW_IC_TX_ABRT_10ADDR2_NOACK (1UL << ABRT_10ADDR2_NOACK) |
| #define DW_IC_TX_ABRT_TXDATA_NOACK (1UL << ABRT_TXDATA_NOACK) |
| #define DW_IC_TX_ABRT_GCALL_NOACK (1UL << ABRT_GCALL_NOACK) |
| #define DW_IC_TX_ABRT_GCALL_READ (1UL << ABRT_GCALL_READ) |
| #define DW_IC_TX_ABRT_SBYTE_ACKDET (1UL << ABRT_SBYTE_ACKDET) |
| #define DW_IC_TX_ABRT_SBYTE_NORSTRT (1UL << ABRT_SBYTE_NORSTRT) |
| #define DW_IC_TX_ABRT_10B_RD_NORSTRT (1UL << ABRT_10B_RD_NORSTRT) |
| #define DW_IC_TX_ABRT_MASTER_DIS (1UL << ABRT_MASTER_DIS) |
| #define DW_IC_TX_ARB_LOST (1UL << ARB_LOST) |
| #define DW_IC_RX_ABRT_SLAVE_RD_INTX (1UL << ABRT_SLAVE_RD_INTX) |
| #define DW_IC_RX_ABRT_SLAVE_ARBLOST (1UL << ABRT_SLAVE_ARBLOST) |
| #define DW_IC_RX_ABRT_SLAVE_FLUSH_TXFIFO (1UL << 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 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 |
| * @slave: represent an I2C slave device |
| * @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 |
| * @adapter: i2c subsystem adapter node |
| * @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 |
| * @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 |
| * @disable: function to disable the controller |
| * @disable_int: function to disable all interrupts |
| * @init: function to initialize the I2C hardware |
| * @mode: operation mode - DW_IC_MASTER or DW_IC_SLAVE |
| * |
| * 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; |
| struct i2c_client *slave; |
| 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; |
| 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; |
| 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; |
| void (*disable)(struct dw_i2c_dev *dev); |
| void (*disable_int)(struct dw_i2c_dev *dev); |
| int (*init)(struct dw_i2c_dev *dev); |
| int mode; |
| struct i2c_bus_recovery_info rinfo; |
| }; |
| |
| #define ACCESS_SWAP 0x00000001 |
| #define ACCESS_16BIT 0x00000002 |
| #define ACCESS_INTR_MASK 0x00000004 |
| |
| #define MODEL_CHERRYTRAIL 0x00000100 |
| |
| u32 dw_readl(struct dw_i2c_dev *dev, int offset); |
| void dw_writel(struct dw_i2c_dev *dev, u32 b, int offset); |
| int i2c_dw_set_reg_access(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); |
| unsigned long 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); |
| 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); |
| |
| static inline void __i2c_dw_enable(struct dw_i2c_dev *dev) |
| { |
| dw_writel(dev, 1, DW_IC_ENABLE); |
| } |
| |
| static inline void __i2c_dw_disable_nowait(struct dw_i2c_dev *dev) |
| { |
| dw_writel(dev, 0, DW_IC_ENABLE); |
| } |
| |
| void __i2c_dw_disable(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_SLAVE) |
| extern int i2c_dw_probe_slave(struct dw_i2c_dev *dev); |
| #else |
| static inline int i2c_dw_probe_slave(struct dw_i2c_dev *dev) { return -EINVAL; } |
| #endif |
| |
| #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 |
