1 /* SPDX-License-Identifier: GPL-2.0+ */
4 * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
13 #include <linux/bitops.h>
16 u32 ic_con; /* 0x00 */
17 u32 ic_tar; /* 0x04 */
18 u32 ic_sar; /* 0x08 */
19 u32 ic_hs_maddr; /* 0x0c */
20 u32 ic_cmd_data; /* 0x10 */
21 u32 ic_ss_scl_hcnt; /* 0x14 */
22 u32 ic_ss_scl_lcnt; /* 0x18 */
23 u32 ic_fs_scl_hcnt; /* 0x1c */
24 u32 ic_fs_scl_lcnt; /* 0x20 */
25 u32 ic_hs_scl_hcnt; /* 0x24 */
26 u32 ic_hs_scl_lcnt; /* 0x28 */
27 u32 ic_intr_stat; /* 0x2c */
28 u32 ic_intr_mask; /* 0x30 */
29 u32 ic_raw_intr_stat; /* 0x34 */
30 u32 ic_rx_tl; /* 0x38 */
31 u32 ic_tx_tl; /* 0x3c */
32 u32 ic_clr_intr; /* 0x40 */
33 u32 ic_clr_rx_under; /* 0x44 */
34 u32 ic_clr_rx_over; /* 0x48 */
35 u32 ic_clr_tx_over; /* 0x4c */
36 u32 ic_clr_rd_req; /* 0x50 */
37 u32 ic_clr_tx_abrt; /* 0x54 */
38 u32 ic_clr_rx_done; /* 0x58 */
39 u32 ic_clr_activity; /* 0x5c */
40 u32 ic_clr_stop_det; /* 0x60 */
41 u32 ic_clr_start_det; /* 0x64 */
42 u32 ic_clr_gen_call; /* 0x68 */
43 u32 ic_enable; /* 0x6c */
44 u32 ic_status; /* 0x70 */
45 u32 ic_txflr; /* 0x74 */
46 u32 ic_rxflr; /* 0x78 */
47 u32 ic_sda_hold; /* 0x7c */
48 u32 ic_tx_abrt_source; /* 0x80 */
49 u32 slv_data_nak_only;
55 u32 ic_enable_status; /* 0x9c */
59 u8 reserved[0xf4 - 0xac];
60 u32 comp_param1; /* 0xf4 */
65 #define IC_CLK 166666666
66 #define NANO_TO_KILO 1000000
68 /* High and low times in different speed modes (in ns) */
69 #define MIN_SS_SCL_HIGHTIME 4000
70 #define MIN_SS_SCL_LOWTIME 4700
71 #define MIN_FS_SCL_HIGHTIME 600
72 #define MIN_FS_SCL_LOWTIME 1300
73 #define MIN_FP_SCL_HIGHTIME 260
74 #define MIN_FP_SCL_LOWTIME 500
75 #define MIN_HS_SCL_HIGHTIME 60
76 #define MIN_HS_SCL_LOWTIME 160
78 /* Worst case timeout for 1 byte is kept as 2ms */
79 #define I2C_BYTE_TO (CONFIG_SYS_HZ/500)
80 #define I2C_STOPDET_TO (CONFIG_SYS_HZ/500)
81 #define I2C_BYTE_TO_BB (I2C_BYTE_TO * 16)
83 /* i2c control register definitions */
84 #define IC_CON_SD 0x0040
85 #define IC_CON_RE 0x0020
86 #define IC_CON_10BITADDRMASTER 0x0010
87 #define IC_CON_10BITADDR_SLAVE 0x0008
88 #define IC_CON_SPD_MSK 0x0006
89 #define IC_CON_SPD_SS 0x0002
90 #define IC_CON_SPD_FS 0x0004
91 #define IC_CON_SPD_HS 0x0006
92 #define IC_CON_MM 0x0001
94 /* i2c target address register definitions */
95 #define TAR_ADDR 0x0050
97 /* i2c slave address register definitions */
98 #define IC_SLAVE_ADDR 0x0002
100 /* i2c data buffer and command register definitions */
101 #define IC_CMD 0x0100
102 #define IC_STOP 0x0200
104 /* i2c interrupt status register definitions */
105 #define IC_GEN_CALL 0x0800
106 #define IC_START_DET 0x0400
107 #define IC_STOP_DET 0x0200
108 #define IC_ACTIVITY 0x0100
109 #define IC_RX_DONE 0x0080
110 #define IC_TX_ABRT 0x0040
111 #define IC_RD_REQ 0x0020
112 #define IC_TX_EMPTY 0x0010
113 #define IC_TX_OVER 0x0008
114 #define IC_RX_FULL 0x0004
115 #define IC_RX_OVER 0x0002
116 #define IC_RX_UNDER 0x0001
118 /* fifo threshold register definitions */
127 #define IC_RX_TL IC_TL0
128 #define IC_TX_TL IC_TL0
130 /* i2c enable register definitions */
131 #define IC_ENABLE_0B 0x0001
133 /* i2c status register definitions */
134 #define IC_STATUS_SA 0x0040
135 #define IC_STATUS_MA 0x0020
136 #define IC_STATUS_RFF 0x0010
137 #define IC_STATUS_RFNE 0x0008
138 #define IC_STATUS_TFE 0x0004
139 #define IC_STATUS_TFNF 0x0002
140 #define IC_STATUS_ACT 0x0001
142 #define DW_IC_COMP_PARAM_1_SPEED_MODE_HIGH (BIT(2) | BIT(3))
143 #define DW_IC_COMP_PARAM_1_SPEED_MODE_MASK (BIT(2) | BIT(3))
146 * struct dw_scl_sda_cfg - I2C timing configuration
148 * @ss_hcnt: Standard speed high time in ns
149 * @fs_hcnt: Fast speed high time in ns
150 * @hs_hcnt: High speed high time in ns
151 * @ss_lcnt: Standard speed low time in ns
152 * @fs_lcnt: Fast speed low time in ns
153 * @hs_lcnt: High speed low time in ns
154 * @sda_hold: SDA hold time
156 struct dw_scl_sda_cfg {
167 * struct dw_i2c_speed_config - timings to use for a particular speed
169 * This holds calculated values to be written to the I2C controller. Each value
170 * is represented as a number of IC clock cycles.
172 * @scl_lcnt: Low count value for SCL
173 * @scl_hcnt: High count value for SCL
174 * @sda_hold: Data hold count
175 * @speed_mode: Speed mode being used
177 struct dw_i2c_speed_config {
178 /* SCL high and low period count */
182 enum i2c_speed_mode speed_mode;
186 * struct dw_i2c - private information for the bus
188 * @regs: Registers pointer
189 * @scl_sda_cfg: Deprecated information for x86 (should move to device tree)
190 * @resets: Resets for the I2C controller
191 * @scl_rise_time_ns: Configured SCL rise time in nanoseconds
192 * @scl_fall_time_ns: Configured SCL fall time in nanoseconds
193 * @sda_hold_time_ns: Configured SDA hold time in nanoseconds
194 * @has_spk_cnt: true if the spike-count register is present
195 * @clk: Clock input to the I2C controller
198 struct i2c_regs *regs;
199 struct dw_scl_sda_cfg *scl_sda_cfg;
200 struct reset_ctl_bulk resets;
201 u32 scl_rise_time_ns;
202 u32 scl_fall_time_ns;
203 u32 sda_hold_time_ns;
205 #if CONFIG_IS_ENABLED(CLK)
208 struct dw_i2c_speed_config config;
211 extern const struct dm_i2c_ops designware_i2c_ops;
213 int designware_i2c_probe(struct udevice *bus);
214 int designware_i2c_remove(struct udevice *dev);
215 int designware_i2c_of_to_plat(struct udevice *bus);
218 * dw_i2c_gen_speed_config() - Calculate config info from requested speed
220 * Calculate the speed config from the given @speed_hz and return it so that
221 * it can be incorporated in ACPI tables
223 * @dev: I2C bus to check
224 * @speed_hz: Requested speed in Hz
225 * @config: Returns config to use for that speed
226 * @return 0 if OK, -ve on error
228 int dw_i2c_gen_speed_config(const struct udevice *dev, int speed_hz,
229 struct dw_i2c_speed_config *config);
231 #endif /* __DW_I2C_H_ */