1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Synopsys DesignWare I2C adapter driver.
5 * Based on the TI DAVINCI I2C adapter driver.
7 * Copyright (C) 2006 Texas Instruments.
8 * Copyright (C) 2007 MontaVista Software Inc.
9 * Copyright (C) 2009 Provigent Ltd.
12 #include <linux/bits.h>
13 #include <linux/compiler_types.h>
14 #include <linux/completion.h>
15 #include <linux/dev_printk.h>
16 #include <linux/errno.h>
17 #include <linux/i2c.h>
18 #include <linux/regmap.h>
19 #include <linux/types.h>
21 #define DW_IC_DEFAULT_FUNCTIONALITY (I2C_FUNC_I2C | \
22 I2C_FUNC_SMBUS_BYTE | \
23 I2C_FUNC_SMBUS_BYTE_DATA | \
24 I2C_FUNC_SMBUS_WORD_DATA | \
25 I2C_FUNC_SMBUS_BLOCK_DATA | \
26 I2C_FUNC_SMBUS_I2C_BLOCK)
28 #define DW_IC_CON_MASTER BIT(0)
29 #define DW_IC_CON_SPEED_STD (1 << 1)
30 #define DW_IC_CON_SPEED_FAST (2 << 1)
31 #define DW_IC_CON_SPEED_HIGH (3 << 1)
32 #define DW_IC_CON_SPEED_MASK GENMASK(2, 1)
33 #define DW_IC_CON_10BITADDR_SLAVE BIT(3)
34 #define DW_IC_CON_10BITADDR_MASTER BIT(4)
35 #define DW_IC_CON_RESTART_EN BIT(5)
36 #define DW_IC_CON_SLAVE_DISABLE BIT(6)
37 #define DW_IC_CON_STOP_DET_IFADDRESSED BIT(7)
38 #define DW_IC_CON_TX_EMPTY_CTRL BIT(8)
39 #define DW_IC_CON_RX_FIFO_FULL_HLD_CTRL BIT(9)
41 #define DW_IC_DATA_CMD_DAT GENMASK(7, 0)
46 #define DW_IC_CON 0x00
47 #define DW_IC_TAR 0x04
48 #define DW_IC_SAR 0x08
49 #define DW_IC_DATA_CMD 0x10
50 #define DW_IC_SS_SCL_HCNT 0x14
51 #define DW_IC_SS_SCL_LCNT 0x18
52 #define DW_IC_FS_SCL_HCNT 0x1c
53 #define DW_IC_FS_SCL_LCNT 0x20
54 #define DW_IC_HS_SCL_HCNT 0x24
55 #define DW_IC_HS_SCL_LCNT 0x28
56 #define DW_IC_INTR_STAT 0x2c
57 #define DW_IC_INTR_MASK 0x30
58 #define DW_IC_RAW_INTR_STAT 0x34
59 #define DW_IC_RX_TL 0x38
60 #define DW_IC_TX_TL 0x3c
61 #define DW_IC_CLR_INTR 0x40
62 #define DW_IC_CLR_RX_UNDER 0x44
63 #define DW_IC_CLR_RX_OVER 0x48
64 #define DW_IC_CLR_TX_OVER 0x4c
65 #define DW_IC_CLR_RD_REQ 0x50
66 #define DW_IC_CLR_TX_ABRT 0x54
67 #define DW_IC_CLR_RX_DONE 0x58
68 #define DW_IC_CLR_ACTIVITY 0x5c
69 #define DW_IC_CLR_STOP_DET 0x60
70 #define DW_IC_CLR_START_DET 0x64
71 #define DW_IC_CLR_GEN_CALL 0x68
72 #define DW_IC_ENABLE 0x6c
73 #define DW_IC_STATUS 0x70
74 #define DW_IC_TXFLR 0x74
75 #define DW_IC_RXFLR 0x78
76 #define DW_IC_SDA_HOLD 0x7c
77 #define DW_IC_TX_ABRT_SOURCE 0x80
78 #define DW_IC_ENABLE_STATUS 0x9c
79 #define DW_IC_CLR_RESTART_DET 0xa8
80 #define DW_IC_COMP_PARAM_1 0xf4
81 #define DW_IC_COMP_VERSION 0xf8
82 #define DW_IC_SDA_HOLD_MIN_VERS 0x3131312A
83 #define DW_IC_COMP_TYPE 0xfc
84 #define DW_IC_COMP_TYPE_VALUE 0x44570140
86 #define DW_IC_INTR_RX_UNDER BIT(0)
87 #define DW_IC_INTR_RX_OVER BIT(1)
88 #define DW_IC_INTR_RX_FULL BIT(2)
89 #define DW_IC_INTR_TX_OVER BIT(3)
90 #define DW_IC_INTR_TX_EMPTY BIT(4)
91 #define DW_IC_INTR_RD_REQ BIT(5)
92 #define DW_IC_INTR_TX_ABRT BIT(6)
93 #define DW_IC_INTR_RX_DONE BIT(7)
94 #define DW_IC_INTR_ACTIVITY BIT(8)
95 #define DW_IC_INTR_STOP_DET BIT(9)
96 #define DW_IC_INTR_START_DET BIT(10)
97 #define DW_IC_INTR_GEN_CALL BIT(11)
98 #define DW_IC_INTR_RESTART_DET BIT(12)
100 #define DW_IC_INTR_DEFAULT_MASK (DW_IC_INTR_RX_FULL | \
101 DW_IC_INTR_TX_ABRT | \
103 #define DW_IC_INTR_MASTER_MASK (DW_IC_INTR_DEFAULT_MASK | \
105 #define DW_IC_INTR_SLAVE_MASK (DW_IC_INTR_DEFAULT_MASK | \
106 DW_IC_INTR_RX_DONE | \
107 DW_IC_INTR_RX_UNDER | \
110 #define DW_IC_STATUS_ACTIVITY BIT(0)
111 #define DW_IC_STATUS_TFE BIT(2)
112 #define DW_IC_STATUS_MASTER_ACTIVITY BIT(5)
113 #define DW_IC_STATUS_SLAVE_ACTIVITY BIT(6)
115 #define DW_IC_SDA_HOLD_RX_SHIFT 16
116 #define DW_IC_SDA_HOLD_RX_MASK GENMASK(23, 16)
118 #define DW_IC_ERR_TX_ABRT 0x1
120 #define DW_IC_TAR_10BITADDR_MASTER BIT(12)
122 #define DW_IC_COMP_PARAM_1_SPEED_MODE_HIGH (BIT(2) | BIT(3))
123 #define DW_IC_COMP_PARAM_1_SPEED_MODE_MASK GENMASK(3, 2)
128 #define STATUS_IDLE 0x0
129 #define STATUS_WRITE_IN_PROGRESS 0x1
130 #define STATUS_READ_IN_PROGRESS 0x2
135 #define DW_IC_MASTER 0
136 #define DW_IC_SLAVE 1
139 * Hardware abort codes from the DW_IC_TX_ABRT_SOURCE register
141 * Only expected abort codes are listed here
142 * refer to the datasheet for the full list
144 #define ABRT_7B_ADDR_NOACK 0
145 #define ABRT_10ADDR1_NOACK 1
146 #define ABRT_10ADDR2_NOACK 2
147 #define ABRT_TXDATA_NOACK 3
148 #define ABRT_GCALL_NOACK 4
149 #define ABRT_GCALL_READ 5
150 #define ABRT_SBYTE_ACKDET 7
151 #define ABRT_SBYTE_NORSTRT 9
152 #define ABRT_10B_RD_NORSTRT 10
153 #define ABRT_MASTER_DIS 11
155 #define ABRT_SLAVE_FLUSH_TXFIFO 13
156 #define ABRT_SLAVE_ARBLOST 14
157 #define ABRT_SLAVE_RD_INTX 15
159 #define DW_IC_TX_ABRT_7B_ADDR_NOACK BIT(ABRT_7B_ADDR_NOACK)
160 #define DW_IC_TX_ABRT_10ADDR1_NOACK BIT(ABRT_10ADDR1_NOACK)
161 #define DW_IC_TX_ABRT_10ADDR2_NOACK BIT(ABRT_10ADDR2_NOACK)
162 #define DW_IC_TX_ABRT_TXDATA_NOACK BIT(ABRT_TXDATA_NOACK)
163 #define DW_IC_TX_ABRT_GCALL_NOACK BIT(ABRT_GCALL_NOACK)
164 #define DW_IC_TX_ABRT_GCALL_READ BIT(ABRT_GCALL_READ)
165 #define DW_IC_TX_ABRT_SBYTE_ACKDET BIT(ABRT_SBYTE_ACKDET)
166 #define DW_IC_TX_ABRT_SBYTE_NORSTRT BIT(ABRT_SBYTE_NORSTRT)
167 #define DW_IC_TX_ABRT_10B_RD_NORSTRT BIT(ABRT_10B_RD_NORSTRT)
168 #define DW_IC_TX_ABRT_MASTER_DIS BIT(ABRT_MASTER_DIS)
169 #define DW_IC_TX_ARB_LOST BIT(ARB_LOST)
170 #define DW_IC_RX_ABRT_SLAVE_RD_INTX BIT(ABRT_SLAVE_RD_INTX)
171 #define DW_IC_RX_ABRT_SLAVE_ARBLOST BIT(ABRT_SLAVE_ARBLOST)
172 #define DW_IC_RX_ABRT_SLAVE_FLUSH_TXFIFO BIT(ABRT_SLAVE_FLUSH_TXFIFO)
174 #define DW_IC_TX_ABRT_NOACK (DW_IC_TX_ABRT_7B_ADDR_NOACK | \
175 DW_IC_TX_ABRT_10ADDR1_NOACK | \
176 DW_IC_TX_ABRT_10ADDR2_NOACK | \
177 DW_IC_TX_ABRT_TXDATA_NOACK | \
178 DW_IC_TX_ABRT_GCALL_NOACK)
182 struct reset_control;
185 * struct dw_i2c_dev - private i2c-designware data
186 * @dev: driver model device node
187 * @map: IO registers map
188 * @sysmap: System controller registers map
189 * @base: IO registers pointer
190 * @ext: Extended IO registers pointer
191 * @cmd_complete: tx completion indicator
192 * @clk: input reference clock
193 * @pclk: clock required to access the registers
194 * @rst: optional reset for the controller
195 * @slave: represent an I2C slave device
196 * @get_clk_rate_khz: callback to retrieve IP specific bus speed
197 * @cmd_err: run time hadware error code
198 * @msgs: points to an array of messages currently being transferred
199 * @msgs_num: the number of elements in msgs
200 * @msg_write_idx: the element index of the current tx message in the msgs array
201 * @tx_buf_len: the length of the current tx buffer
202 * @tx_buf: the current tx buffer
203 * @msg_read_idx: the element index of the current rx message in the msgs array
204 * @rx_buf_len: the length of the current rx buffer
205 * @rx_buf: the current rx buffer
206 * @msg_err: error status of the current transfer
207 * @status: i2c master status, one of STATUS_*
208 * @abort_source: copy of the TX_ABRT_SOURCE register
209 * @irq: interrupt number for the i2c master
210 * @flags: platform specific flags like type of IO accessors or model
211 * @adapter: i2c subsystem adapter node
212 * @functionality: I2C_FUNC_* ORed bits to reflect what controller does support
213 * @master_cfg: configuration for the master device
214 * @slave_cfg: configuration for the slave device
215 * @tx_fifo_depth: depth of the hardware tx fifo
216 * @rx_fifo_depth: depth of the hardware rx fifo
217 * @rx_outstanding: current master-rx elements in tx fifo
218 * @timings: bus clock frequency, SDA hold and other timings
219 * @sda_hold_time: SDA hold value
220 * @ss_hcnt: standard speed HCNT value
221 * @ss_lcnt: standard speed LCNT value
222 * @fs_hcnt: fast speed HCNT value
223 * @fs_lcnt: fast speed LCNT value
224 * @fp_hcnt: fast plus HCNT value
225 * @fp_lcnt: fast plus LCNT value
226 * @hs_hcnt: high speed HCNT value
227 * @hs_lcnt: high speed LCNT value
228 * @acquire_lock: function to acquire a hardware lock on the bus
229 * @release_lock: function to release a hardware lock on the bus
230 * @shared_with_punit: true if this bus is shared with the SoCs PUNIT
231 * @disable: function to disable the controller
232 * @disable_int: function to disable all interrupts
233 * @init: function to initialize the I2C hardware
234 * @set_sda_hold_time: callback to retrieve IP specific SDA hold timing
235 * @mode: operation mode - DW_IC_MASTER or DW_IC_SLAVE
236 * @rinfo: I²C GPIO recovery information
237 * @suspended: set to true if the controller is suspended
239 * HCNT and LCNT parameters can be used if the platform knows more accurate
240 * values than the one computed based only on the input clock frequency.
241 * Leave them to be %0 if not used.
246 struct regmap *sysmap;
249 struct completion cmd_complete;
252 struct reset_control *rst;
253 struct i2c_client *slave;
254 u32 (*get_clk_rate_khz) (struct dw_i2c_dev *dev);
256 struct i2c_msg *msgs;
269 struct i2c_adapter adapter;
273 unsigned int tx_fifo_depth;
274 unsigned int rx_fifo_depth;
276 struct i2c_timings timings;
286 int (*acquire_lock)(void);
287 void (*release_lock)(void);
288 bool shared_with_punit;
289 void (*disable)(struct dw_i2c_dev *dev);
290 void (*disable_int)(struct dw_i2c_dev *dev);
291 int (*init)(struct dw_i2c_dev *dev);
292 int (*set_sda_hold_time)(struct dw_i2c_dev *dev);
294 struct i2c_bus_recovery_info rinfo;
298 #define ACCESS_INTR_MASK BIT(0)
299 #define ACCESS_NO_IRQ_SUSPEND BIT(1)
301 #define MODEL_MSCC_OCELOT BIT(8)
302 #define MODEL_BAIKAL_BT1 BIT(9)
303 #define MODEL_AMD_NAVI_GPU BIT(10)
304 #define MODEL_MASK GENMASK(11, 8)
307 * Enable UCSI interrupt by writing 0xd at register
308 * offset 0x474 specified in hardware specification.
310 #define AMD_UCSI_INTR_REG 0x474
311 #define AMD_UCSI_INTR_EN 0xd
313 int i2c_dw_init_regmap(struct dw_i2c_dev *dev);
314 u32 i2c_dw_scl_hcnt(u32 ic_clk, u32 tSYMBOL, u32 tf, int cond, int offset);
315 u32 i2c_dw_scl_lcnt(u32 ic_clk, u32 tLOW, u32 tf, int offset);
316 int i2c_dw_set_sda_hold(struct dw_i2c_dev *dev);
317 unsigned long i2c_dw_clk_rate(struct dw_i2c_dev *dev);
318 int i2c_dw_prepare_clk(struct dw_i2c_dev *dev, bool prepare);
319 int i2c_dw_acquire_lock(struct dw_i2c_dev *dev);
320 void i2c_dw_release_lock(struct dw_i2c_dev *dev);
321 int i2c_dw_wait_bus_not_busy(struct dw_i2c_dev *dev);
322 int i2c_dw_handle_tx_abort(struct dw_i2c_dev *dev);
323 int i2c_dw_set_fifo_size(struct dw_i2c_dev *dev);
324 u32 i2c_dw_func(struct i2c_adapter *adap);
325 void i2c_dw_disable(struct dw_i2c_dev *dev);
326 void i2c_dw_disable_int(struct dw_i2c_dev *dev);
328 static inline void __i2c_dw_enable(struct dw_i2c_dev *dev)
330 regmap_write(dev->map, DW_IC_ENABLE, 1);
333 static inline void __i2c_dw_disable_nowait(struct dw_i2c_dev *dev)
335 regmap_write(dev->map, DW_IC_ENABLE, 0);
338 void __i2c_dw_disable(struct dw_i2c_dev *dev);
340 extern void i2c_dw_configure_master(struct dw_i2c_dev *dev);
341 extern int i2c_dw_probe_master(struct dw_i2c_dev *dev);
343 #if IS_ENABLED(CONFIG_I2C_DESIGNWARE_SLAVE)
344 extern void i2c_dw_configure_slave(struct dw_i2c_dev *dev);
345 extern int i2c_dw_probe_slave(struct dw_i2c_dev *dev);
347 static inline void i2c_dw_configure_slave(struct dw_i2c_dev *dev) { }
348 static inline int i2c_dw_probe_slave(struct dw_i2c_dev *dev) { return -EINVAL; }
351 static inline int i2c_dw_probe(struct dw_i2c_dev *dev)
355 return i2c_dw_probe_slave(dev);
357 return i2c_dw_probe_master(dev);
359 dev_err(dev->dev, "Wrong operation mode: %d\n", dev->mode);
364 static inline void i2c_dw_configure(struct dw_i2c_dev *dev)
366 if (i2c_detect_slave_mode(dev->dev))
367 i2c_dw_configure_slave(dev);
369 i2c_dw_configure_master(dev);
372 #if IS_ENABLED(CONFIG_I2C_DESIGNWARE_BAYTRAIL)
373 extern int i2c_dw_probe_lock_support(struct dw_i2c_dev *dev);
375 static inline int i2c_dw_probe_lock_support(struct dw_i2c_dev *dev) { return 0; }
378 int i2c_dw_validate_speed(struct dw_i2c_dev *dev);
379 void i2c_dw_adjust_bus_speed(struct dw_i2c_dev *dev);
381 #if IS_ENABLED(CONFIG_ACPI)
382 int i2c_dw_acpi_configure(struct device *device);
384 static inline int i2c_dw_acpi_configure(struct device *device) { return -ENODEV; }