drivers/i2c/designware_i2c.h - platform/external/u-boot - Gitiles

 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * (C) Copyright 2009
  * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
  */

 #ifndef __DW_I2C_H_
 #define __DW_I2C_H_

 #include <clk.h>
 #include <i2c.h>
 #include <reset.h>
 #include <linux/bitops.h>

 struct i2c_regs {
 	u32 ic_con;		/* 0x00 */
 	u32 ic_tar;		/* 0x04 */
 	u32 ic_sar;		/* 0x08 */
 	u32 ic_hs_maddr;	/* 0x0c */
 	u32 ic_cmd_data;	/* 0x10 */
 	u32 ic_ss_scl_hcnt;	/* 0x14 */
 	u32 ic_ss_scl_lcnt;	/* 0x18 */
 	u32 ic_fs_scl_hcnt;	/* 0x1c */
 	u32 ic_fs_scl_lcnt;	/* 0x20 */
 	u32 ic_hs_scl_hcnt;	/* 0x24 */
 	u32 ic_hs_scl_lcnt;	/* 0x28 */
 	u32 ic_intr_stat;	/* 0x2c */
 	u32 ic_intr_mask;	/* 0x30 */
 	u32 ic_raw_intr_stat;	/* 0x34 */
 	u32 ic_rx_tl;		/* 0x38 */
 	u32 ic_tx_tl;		/* 0x3c */
 	u32 ic_clr_intr;	/* 0x40 */
 	u32 ic_clr_rx_under;	/* 0x44 */
 	u32 ic_clr_rx_over;	/* 0x48 */
 	u32 ic_clr_tx_over;	/* 0x4c */
 	u32 ic_clr_rd_req;	/* 0x50 */
 	u32 ic_clr_tx_abrt;	/* 0x54 */
 	u32 ic_clr_rx_done;	/* 0x58 */
 	u32 ic_clr_activity;	/* 0x5c */
 	u32 ic_clr_stop_det;	/* 0x60 */
 	u32 ic_clr_start_det;	/* 0x64 */
 	u32 ic_clr_gen_call;	/* 0x68 */
 	u32 ic_enable;		/* 0x6c */
 	u32 ic_status;		/* 0x70 */
 	u32 ic_txflr;		/* 0x74 */
 	u32 ic_rxflr;		/* 0x78 */
 	u32 ic_sda_hold;	/* 0x7c */
 	u32 ic_tx_abrt_source;	/* 0x80 */
 	u32 slv_data_nak_only;
 	u32 dma_cr;
 	u32 dma_tdlr;
 	u32 dma_rdlr;
 	u32 sda_setup;
 	u32 ack_general_call;
 	u32 ic_enable_status;	/* 0x9c */
 	u32 fs_spklen;
 	u32 hs_spklen;
 	u32 clr_restart_det;
 	u8 reserved[0xf4 - 0xac];
 	u32 comp_param1;	/* 0xf4 */
 	u32 comp_version;
 	u32 comp_type;
 };

 #define IC_CLK			166666666
 #define NANO_TO_KILO		1000000

 /* High and low times in different speed modes (in ns) */
 #define MIN_SS_SCL_HIGHTIME	4000
 #define MIN_SS_SCL_LOWTIME	4700
 #define MIN_FS_SCL_HIGHTIME	600
 #define MIN_FS_SCL_LOWTIME	1300
 #define MIN_FP_SCL_HIGHTIME	260
 #define MIN_FP_SCL_LOWTIME	500
 #define MIN_HS_SCL_HIGHTIME	60
 #define MIN_HS_SCL_LOWTIME	160

 /* Worst case timeout for 1 byte is kept as 2ms */
 #define I2C_BYTE_TO		(CONFIG_SYS_HZ/500)
 #define I2C_STOPDET_TO		(CONFIG_SYS_HZ/500)
 #define I2C_BYTE_TO_BB		(I2C_BYTE_TO * 16)

 /* i2c control register definitions */
 #define IC_CON_SD		0x0040
 #define IC_CON_RE		0x0020
 #define IC_CON_10BITADDRMASTER	0x0010
 #define IC_CON_10BITADDR_SLAVE	0x0008
 #define IC_CON_SPD_MSK		0x0006
 #define IC_CON_SPD_SS		0x0002
 #define IC_CON_SPD_FS		0x0004
 #define IC_CON_SPD_HS		0x0006
 #define IC_CON_MM		0x0001

 /* i2c target address register definitions */
 #define TAR_ADDR		0x0050

 /* i2c slave address register definitions */
 #define IC_SLAVE_ADDR		0x0002

 /* i2c data buffer and command register definitions */
 #define IC_CMD			0x0100
 #define IC_STOP			0x0200

 /* i2c interrupt status register definitions */
 #define IC_GEN_CALL		0x0800
 #define IC_START_DET		0x0400
 #define IC_STOP_DET		0x0200
 #define IC_ACTIVITY		0x0100
 #define IC_RX_DONE		0x0080
 #define IC_TX_ABRT		0x0040
 #define IC_RD_REQ		0x0020
 #define IC_TX_EMPTY		0x0010
 #define IC_TX_OVER		0x0008
 #define IC_RX_FULL		0x0004
 #define IC_RX_OVER 		0x0002
 #define IC_RX_UNDER		0x0001

 /* fifo threshold register definitions */
 #define IC_TL0			0x00
 #define IC_TL1			0x01
 #define IC_TL2			0x02
 #define IC_TL3			0x03
 #define IC_TL4			0x04
 #define IC_TL5			0x05
 #define IC_TL6			0x06
 #define IC_TL7			0x07
 #define IC_RX_TL		IC_TL0
 #define IC_TX_TL		IC_TL0

 /* i2c enable register definitions */
 #define IC_ENABLE_0B		0x0001

 /* i2c status register  definitions */
 #define IC_STATUS_SA		0x0040
 #define IC_STATUS_MA		0x0020
 #define IC_STATUS_RFF		0x0010
 #define IC_STATUS_RFNE		0x0008
 #define IC_STATUS_TFE		0x0004
 #define IC_STATUS_TFNF		0x0002
 #define IC_STATUS_ACT		0x0001

 #define DW_IC_COMP_PARAM_1_SPEED_MODE_HIGH      (BIT(2) | BIT(3))
 #define DW_IC_COMP_PARAM_1_SPEED_MODE_MASK      (BIT(2) | BIT(3))

 /**
  * struct dw_scl_sda_cfg - I2C timing configuration
  *
  * @ss_hcnt: Standard speed high time in ns
  * @fs_hcnt: Fast speed high time in ns
  * @hs_hcnt: High speed high time in ns
  * @ss_lcnt: Standard speed low time in ns
  * @fs_lcnt: Fast speed low time in ns
  * @hs_lcnt: High speed low time in ns
  * @sda_hold: SDA hold time
  */
 struct dw_scl_sda_cfg {
 	u32 ss_hcnt;
 	u32 fs_hcnt;
 	u32 hs_hcnt;
 	u32 ss_lcnt;
 	u32 fs_lcnt;
 	u32 hs_lcnt;
 	u32 sda_hold;
 };

 /**
  * struct dw_i2c_speed_config - timings to use for a particular speed
  *
  * This holds calculated values to be written to the I2C controller. Each value
  * is represented as a number of IC clock cycles.
  *
  * @scl_lcnt: Low count value for SCL
  * @scl_hcnt: High count value for SCL
  * @sda_hold: Data hold count
  * @speed_mode: Speed mode being used
  */
 struct dw_i2c_speed_config {
 	/* SCL high and low period count */
 	u16 scl_lcnt;
 	u16 scl_hcnt;
 	u32 sda_hold;
 	enum i2c_speed_mode speed_mode;
 };

 /**
  * struct dw_i2c - private information for the bus
  *
  * @regs: Registers pointer
  * @scl_sda_cfg: Deprecated information for x86 (should move to device tree)
  * @resets: Resets for the I2C controller
  * @scl_rise_time_ns: Configured SCL rise time in nanoseconds
  * @scl_fall_time_ns: Configured SCL fall time in nanoseconds
  * @sda_hold_time_ns: Configured SDA hold time in nanoseconds
  * @has_spk_cnt: true if the spike-count register is present
  * @clk: Clock input to the I2C controller
  */
 struct dw_i2c {
 	struct i2c_regs *regs;
 	struct dw_scl_sda_cfg *scl_sda_cfg;
 	struct reset_ctl_bulk resets;
 	u32 scl_rise_time_ns;
 	u32 scl_fall_time_ns;
 	u32 sda_hold_time_ns;
 	bool has_spk_cnt;
 #if CONFIG_IS_ENABLED(CLK)
 	struct clk clk;
 #endif
 	struct dw_i2c_speed_config config;
 };

 extern const struct dm_i2c_ops designware_i2c_ops;

 int designware_i2c_probe(struct udevice *bus);
 int designware_i2c_remove(struct udevice *dev);
 int designware_i2c_of_to_plat(struct udevice *bus);

 /**
  * dw_i2c_gen_speed_config() - Calculate config info from requested speed
  *
  * Calculate the speed config from the given @speed_hz and return it so that
  * it can be incorporated in ACPI tables
  *
  * @dev: I2C bus to check
  * @speed_hz: Requested speed in Hz
  * @config: Returns config to use for that speed
  * @return 0 if OK, -ve on error
  */
 int dw_i2c_gen_speed_config(const struct udevice *dev, int speed_hz,
 			    struct dw_i2c_speed_config *config);

 #endif /* __DW_I2C_H_ */
	/* SPDX-License-Identifier: GPL-2.0+ */
	/*
	* (C) Copyright 2009
	* Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
	*/

	#ifndef __DW_I2C_H_
	#define __DW_I2C_H_

	#include <clk.h>
	#include <i2c.h>
	#include <reset.h>
	#include <linux/bitops.h>

	struct i2c_regs {
	u32 ic_con; /* 0x00 */
	u32 ic_tar; /* 0x04 */
	u32 ic_sar; /* 0x08 */
	u32 ic_hs_maddr; /* 0x0c */
	u32 ic_cmd_data; /* 0x10 */
	u32 ic_ss_scl_hcnt; /* 0x14 */
	u32 ic_ss_scl_lcnt; /* 0x18 */
	u32 ic_fs_scl_hcnt; /* 0x1c */
	u32 ic_fs_scl_lcnt; /* 0x20 */
	u32 ic_hs_scl_hcnt; /* 0x24 */
	u32 ic_hs_scl_lcnt; /* 0x28 */
	u32 ic_intr_stat; /* 0x2c */
	u32 ic_intr_mask; /* 0x30 */
	u32 ic_raw_intr_stat; /* 0x34 */
	u32 ic_rx_tl; /* 0x38 */
	u32 ic_tx_tl; /* 0x3c */
	u32 ic_clr_intr; /* 0x40 */
	u32 ic_clr_rx_under; /* 0x44 */
	u32 ic_clr_rx_over; /* 0x48 */
	u32 ic_clr_tx_over; /* 0x4c */
	u32 ic_clr_rd_req; /* 0x50 */
	u32 ic_clr_tx_abrt; /* 0x54 */
	u32 ic_clr_rx_done; /* 0x58 */
	u32 ic_clr_activity; /* 0x5c */
	u32 ic_clr_stop_det; /* 0x60 */
	u32 ic_clr_start_det; /* 0x64 */
	u32 ic_clr_gen_call; /* 0x68 */
	u32 ic_enable; /* 0x6c */
	u32 ic_status; /* 0x70 */
	u32 ic_txflr; /* 0x74 */
	u32 ic_rxflr; /* 0x78 */
	u32 ic_sda_hold; /* 0x7c */
	u32 ic_tx_abrt_source; /* 0x80 */
	u32 slv_data_nak_only;
	u32 dma_cr;
	u32 dma_tdlr;
	u32 dma_rdlr;
	u32 sda_setup;
	u32 ack_general_call;
	u32 ic_enable_status; /* 0x9c */
	u32 fs_spklen;
	u32 hs_spklen;
	u32 clr_restart_det;
	u8 reserved[0xf4 - 0xac];
	u32 comp_param1; /* 0xf4 */
	u32 comp_version;
	u32 comp_type;
	};

	#define IC_CLK 166666666
	#define NANO_TO_KILO 1000000

	/* High and low times in different speed modes (in ns) */
	#define MIN_SS_SCL_HIGHTIME 4000
	#define MIN_SS_SCL_LOWTIME 4700
	#define MIN_FS_SCL_HIGHTIME 600
	#define MIN_FS_SCL_LOWTIME 1300
	#define MIN_FP_SCL_HIGHTIME 260
	#define MIN_FP_SCL_LOWTIME 500
	#define MIN_HS_SCL_HIGHTIME 60
	#define MIN_HS_SCL_LOWTIME 160

	/* Worst case timeout for 1 byte is kept as 2ms */
	#define I2C_BYTE_TO (CONFIG_SYS_HZ/500)
	#define I2C_STOPDET_TO (CONFIG_SYS_HZ/500)
	#define I2C_BYTE_TO_BB (I2C_BYTE_TO * 16)

	/* i2c control register definitions */
	#define IC_CON_SD 0x0040
	#define IC_CON_RE 0x0020
	#define IC_CON_10BITADDRMASTER 0x0010
	#define IC_CON_10BITADDR_SLAVE 0x0008
	#define IC_CON_SPD_MSK 0x0006
	#define IC_CON_SPD_SS 0x0002
	#define IC_CON_SPD_FS 0x0004
	#define IC_CON_SPD_HS 0x0006
	#define IC_CON_MM 0x0001

	/* i2c target address register definitions */
	#define TAR_ADDR 0x0050

	/* i2c slave address register definitions */
	#define IC_SLAVE_ADDR 0x0002

	/* i2c data buffer and command register definitions */
	#define IC_CMD 0x0100
	#define IC_STOP 0x0200

	/* i2c interrupt status register definitions */
	#define IC_GEN_CALL 0x0800
	#define IC_START_DET 0x0400
	#define IC_STOP_DET 0x0200
	#define IC_ACTIVITY 0x0100
	#define IC_RX_DONE 0x0080
	#define IC_TX_ABRT 0x0040
	#define IC_RD_REQ 0x0020
	#define IC_TX_EMPTY 0x0010
	#define IC_TX_OVER 0x0008
	#define IC_RX_FULL 0x0004
	#define IC_RX_OVER 0x0002
	#define IC_RX_UNDER 0x0001

	/* fifo threshold register definitions */
	#define IC_TL0 0x00
	#define IC_TL1 0x01
	#define IC_TL2 0x02
	#define IC_TL3 0x03
	#define IC_TL4 0x04
	#define IC_TL5 0x05
	#define IC_TL6 0x06
	#define IC_TL7 0x07
	#define IC_RX_TL IC_TL0
	#define IC_TX_TL IC_TL0

	/* i2c enable register definitions */
	#define IC_ENABLE_0B 0x0001

	/* i2c status register definitions */
	#define IC_STATUS_SA 0x0040
	#define IC_STATUS_MA 0x0020
	#define IC_STATUS_RFF 0x0010
	#define IC_STATUS_RFNE 0x0008
	#define IC_STATUS_TFE 0x0004
	#define IC_STATUS_TFNF 0x0002
	#define IC_STATUS_ACT 0x0001

	#define DW_IC_COMP_PARAM_1_SPEED_MODE_HIGH (BIT(2) \| BIT(3))
	#define DW_IC_COMP_PARAM_1_SPEED_MODE_MASK (BIT(2) \| BIT(3))

	/**
	* struct dw_scl_sda_cfg - I2C timing configuration
	*
	* @ss_hcnt: Standard speed high time in ns
	* @fs_hcnt: Fast speed high time in ns
	* @hs_hcnt: High speed high time in ns
	* @ss_lcnt: Standard speed low time in ns
	* @fs_lcnt: Fast speed low time in ns
	* @hs_lcnt: High speed low time in ns
	* @sda_hold: SDA hold time
	*/
	struct dw_scl_sda_cfg {
	u32 ss_hcnt;
	u32 fs_hcnt;
	u32 hs_hcnt;
	u32 ss_lcnt;
	u32 fs_lcnt;
	u32 hs_lcnt;
	u32 sda_hold;
	};

	/**
	* struct dw_i2c_speed_config - timings to use for a particular speed
	*
	* This holds calculated values to be written to the I2C controller. Each value
	* is represented as a number of IC clock cycles.
	*
	* @scl_lcnt: Low count value for SCL
	* @scl_hcnt: High count value for SCL
	* @sda_hold: Data hold count
	* @speed_mode: Speed mode being used
	*/
	struct dw_i2c_speed_config {
	/* SCL high and low period count */
	u16 scl_lcnt;
	u16 scl_hcnt;
	u32 sda_hold;
	enum i2c_speed_mode speed_mode;
	};

	/**
	* struct dw_i2c - private information for the bus
	*
	* @regs: Registers pointer
	* @scl_sda_cfg: Deprecated information for x86 (should move to device tree)
	* @resets: Resets for the I2C controller
	* @scl_rise_time_ns: Configured SCL rise time in nanoseconds
	* @scl_fall_time_ns: Configured SCL fall time in nanoseconds
	* @sda_hold_time_ns: Configured SDA hold time in nanoseconds
	* @has_spk_cnt: true if the spike-count register is present
	* @clk: Clock input to the I2C controller
	*/
	struct dw_i2c {
	struct i2c_regs *regs;
	struct dw_scl_sda_cfg *scl_sda_cfg;
	struct reset_ctl_bulk resets;
	u32 scl_rise_time_ns;
	u32 scl_fall_time_ns;
	u32 sda_hold_time_ns;
	bool has_spk_cnt;
	#if CONFIG_IS_ENABLED(CLK)
	struct clk clk;
	#endif
	struct dw_i2c_speed_config config;
	};

	extern const struct dm_i2c_ops designware_i2c_ops;

	int designware_i2c_probe(struct udevice *bus);
	int designware_i2c_remove(struct udevice *dev);
	int designware_i2c_of_to_plat(struct udevice *bus);

	/**
	* dw_i2c_gen_speed_config() - Calculate config info from requested speed
	*
	* Calculate the speed config from the given @speed_hz and return it so that
	* it can be incorporated in ACPI tables
	*
	* @dev: I2C bus to check
	* @speed_hz: Requested speed in Hz
	* @config: Returns config to use for that speed
	* @return 0 if OK, -ve on error
	*/
	int dw_i2c_gen_speed_config(const struct udevice *dev, int speed_hz,
	struct dw_i2c_speed_config *config);

	#endif /* __DW_I2C_H_ */