1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * Synopsys DesignWare I2C adapter driver.
4 *
5 * Based on the TI DAVINCI I2C adapter driver.
6 *
7 * Copyright (C) 2006 Texas Instruments.
8 * Copyright (C) 2007 MontaVista Software Inc.
9 * Copyright (C) 2009 Provigent Ltd.
10 */
11
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>
20
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)
27
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)
40
41 #define DW_IC_DATA_CMD_DAT GENMASK(7, 0)
42
43 /*
44 * Registers offset
45 */
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
85
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)
99
100 #define DW_IC_INTR_DEFAULT_MASK (DW_IC_INTR_RX_FULL | \
101 DW_IC_INTR_TX_ABRT | \
102 DW_IC_INTR_STOP_DET)
103 #define DW_IC_INTR_MASTER_MASK (DW_IC_INTR_DEFAULT_MASK | \
104 DW_IC_INTR_TX_EMPTY)
105 #define DW_IC_INTR_SLAVE_MASK (DW_IC_INTR_DEFAULT_MASK | \
106 DW_IC_INTR_RX_DONE | \
107 DW_IC_INTR_RX_UNDER | \
108 DW_IC_INTR_RD_REQ)
109
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)
114
115 #define DW_IC_SDA_HOLD_RX_SHIFT 16
116 #define DW_IC_SDA_HOLD_RX_MASK GENMASK(23, 16)
117
118 #define DW_IC_ERR_TX_ABRT 0x1
119
120 #define DW_IC_TAR_10BITADDR_MASTER BIT(12)
121
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)
124
125 /*
126 * status codes
127 */
128 #define STATUS_IDLE 0x0
129 #define STATUS_WRITE_IN_PROGRESS 0x1
130 #define STATUS_READ_IN_PROGRESS 0x2
131
132 /*
133 * operation modes
134 */
135 #define DW_IC_MASTER 0
136 #define DW_IC_SLAVE 1
137
138 /*
139 * Hardware abort codes from the DW_IC_TX_ABRT_SOURCE register
140 *
141 * Only expected abort codes are listed here
142 * refer to the datasheet for the full list
143 */
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
154 #define ARB_LOST 12
155 #define ABRT_SLAVE_FLUSH_TXFIFO 13
156 #define ABRT_SLAVE_ARBLOST 14
157 #define ABRT_SLAVE_RD_INTX 15
158
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)
173
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)
179
180 struct clk;
181 struct device;
182 struct reset_control;
183
184 /**
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 * @semaphore_idx: Index of table with semaphore type attached to the bus. It's
231 * -1 if there is no semaphore.
232 * @shared_with_punit: true if this bus is shared with the SoCs PUNIT
233 * @disable: function to disable the controller
234 * @disable_int: function to disable all interrupts
235 * @init: function to initialize the I2C hardware
236 * @set_sda_hold_time: callback to retrieve IP specific SDA hold timing
237 * @mode: operation mode - DW_IC_MASTER or DW_IC_SLAVE
238 * @rinfo: I²C GPIO recovery information
239 *
240 * HCNT and LCNT parameters can be used if the platform knows more accurate
241 * values than the one computed based only on the input clock frequency.
242 * Leave them to be %0 if not used.
243 */
244 struct dw_i2c_dev {
245 struct device *dev;
246 struct regmap *map;
247 struct regmap *sysmap;
248 void __iomem *base;
249 void __iomem *ext;
250 struct completion cmd_complete;
251 struct clk *clk;
252 struct clk *pclk;
253 struct reset_control *rst;
254 struct i2c_client *slave;
255 u32 (*get_clk_rate_khz) (struct dw_i2c_dev *dev);
256 int cmd_err;
257 struct i2c_msg *msgs;
258 int msgs_num;
259 int msg_write_idx;
260 u32 tx_buf_len;
261 u8 *tx_buf;
262 int msg_read_idx;
263 u32 rx_buf_len;
264 u8 *rx_buf;
265 int msg_err;
266 unsigned int status;
267 u32 abort_source;
268 int irq;
269 u32 flags;
270 struct i2c_adapter adapter;
271 u32 functionality;
272 u32 master_cfg;
273 u32 slave_cfg;
274 unsigned int tx_fifo_depth;
275 unsigned int rx_fifo_depth;
276 int rx_outstanding;
277 struct i2c_timings timings;
278 u32 sda_hold_time;
279 u16 ss_hcnt;
280 u16 ss_lcnt;
281 u16 fs_hcnt;
282 u16 fs_lcnt;
283 u16 fp_hcnt;
284 u16 fp_lcnt;
285 u16 hs_hcnt;
286 u16 hs_lcnt;
287 int (*acquire_lock)(void);
288 void (*release_lock)(void);
289 int semaphore_idx;
290 bool shared_with_punit;
291 void (*disable)(struct dw_i2c_dev *dev);
292 void (*disable_int)(struct dw_i2c_dev *dev);
293 int (*init)(struct dw_i2c_dev *dev);
294 int (*set_sda_hold_time)(struct dw_i2c_dev *dev);
295 int mode;
296 struct i2c_bus_recovery_info rinfo;
297 };
298
299 #define ACCESS_INTR_MASK BIT(0)
300 #define ACCESS_NO_IRQ_SUSPEND BIT(1)
301 #define ARBITRATION_SEMAPHORE BIT(2)
302
303 #define MODEL_MSCC_OCELOT BIT(8)
304 #define MODEL_BAIKAL_BT1 BIT(9)
305 #define MODEL_AMD_NAVI_GPU BIT(10)
306 #define MODEL_MASK GENMASK(11, 8)
307
308 /*
309 * Enable UCSI interrupt by writing 0xd at register
310 * offset 0x474 specified in hardware specification.
311 */
312 #define AMD_UCSI_INTR_REG 0x474
313 #define AMD_UCSI_INTR_EN 0xd
314
315 struct i2c_dw_semaphore_callbacks {
316 int (*probe)(struct dw_i2c_dev *dev);
317 void (*remove)(struct dw_i2c_dev *dev);
318 };
319
320 int i2c_dw_init_regmap(struct dw_i2c_dev *dev);
321 u32 i2c_dw_scl_hcnt(u32 ic_clk, u32 tSYMBOL, u32 tf, int cond, int offset);
322 u32 i2c_dw_scl_lcnt(u32 ic_clk, u32 tLOW, u32 tf, int offset);
323 int i2c_dw_set_sda_hold(struct dw_i2c_dev *dev);
324 unsigned long i2c_dw_clk_rate(struct dw_i2c_dev *dev);
325 int i2c_dw_prepare_clk(struct dw_i2c_dev *dev, bool prepare);
326 int i2c_dw_acquire_lock(struct dw_i2c_dev *dev);
327 void i2c_dw_release_lock(struct dw_i2c_dev *dev);
328 int i2c_dw_wait_bus_not_busy(struct dw_i2c_dev *dev);
329 int i2c_dw_handle_tx_abort(struct dw_i2c_dev *dev);
330 int i2c_dw_set_fifo_size(struct dw_i2c_dev *dev);
331 u32 i2c_dw_func(struct i2c_adapter *adap);
332 void i2c_dw_disable(struct dw_i2c_dev *dev);
333 void i2c_dw_disable_int(struct dw_i2c_dev *dev);
334
__i2c_dw_enable(struct dw_i2c_dev * dev)335 static inline void __i2c_dw_enable(struct dw_i2c_dev *dev)
336 {
337 regmap_write(dev->map, DW_IC_ENABLE, 1);
338 }
339
__i2c_dw_disable_nowait(struct dw_i2c_dev * dev)340 static inline void __i2c_dw_disable_nowait(struct dw_i2c_dev *dev)
341 {
342 regmap_write(dev->map, DW_IC_ENABLE, 0);
343 }
344
345 void __i2c_dw_disable(struct dw_i2c_dev *dev);
346
347 extern void i2c_dw_configure_master(struct dw_i2c_dev *dev);
348 extern int i2c_dw_probe_master(struct dw_i2c_dev *dev);
349
350 #if IS_ENABLED(CONFIG_I2C_DESIGNWARE_SLAVE)
351 extern void i2c_dw_configure_slave(struct dw_i2c_dev *dev);
352 extern int i2c_dw_probe_slave(struct dw_i2c_dev *dev);
353 #else
i2c_dw_configure_slave(struct dw_i2c_dev * dev)354 static inline void i2c_dw_configure_slave(struct dw_i2c_dev *dev) { }
i2c_dw_probe_slave(struct dw_i2c_dev * dev)355 static inline int i2c_dw_probe_slave(struct dw_i2c_dev *dev) { return -EINVAL; }
356 #endif
357
i2c_dw_probe(struct dw_i2c_dev * dev)358 static inline int i2c_dw_probe(struct dw_i2c_dev *dev)
359 {
360 switch (dev->mode) {
361 case DW_IC_SLAVE:
362 return i2c_dw_probe_slave(dev);
363 case DW_IC_MASTER:
364 return i2c_dw_probe_master(dev);
365 default:
366 dev_err(dev->dev, "Wrong operation mode: %d\n", dev->mode);
367 return -EINVAL;
368 }
369 }
370
i2c_dw_configure(struct dw_i2c_dev * dev)371 static inline void i2c_dw_configure(struct dw_i2c_dev *dev)
372 {
373 if (i2c_detect_slave_mode(dev->dev))
374 i2c_dw_configure_slave(dev);
375 else
376 i2c_dw_configure_master(dev);
377 }
378
379 #if IS_ENABLED(CONFIG_I2C_DESIGNWARE_BAYTRAIL)
380 int i2c_dw_baytrail_probe_lock_support(struct dw_i2c_dev *dev);
381 #endif
382
383 #if IS_ENABLED(CONFIG_I2C_DESIGNWARE_AMDPSP)
384 int i2c_dw_amdpsp_probe_lock_support(struct dw_i2c_dev *dev);
385 void i2c_dw_amdpsp_remove_lock_support(struct dw_i2c_dev *dev);
386 #endif
387
388 int i2c_dw_validate_speed(struct dw_i2c_dev *dev);
389 void i2c_dw_adjust_bus_speed(struct dw_i2c_dev *dev);
390
391 #if IS_ENABLED(CONFIG_ACPI)
392 int i2c_dw_acpi_configure(struct device *device);
393 #else
i2c_dw_acpi_configure(struct device * device)394 static inline int i2c_dw_acpi_configure(struct device *device) { return -ENODEV; }
395 #endif
396