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[J-linux.git] / drivers / i2c / busses / i2c-designware-common.c
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 #include <linux/acpi.h>
12 #include <linux/clk.h>
13 #include <linux/delay.h>
14 #include <linux/device.h>
15 #include <linux/err.h>
16 #include <linux/errno.h>
17 #include <linux/export.h>
18 #include <linux/i2c.h>
19 #include <linux/interrupt.h>
20 #include <linux/io.h>
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/of.h>
24 #include <linux/pm.h>
25 #include <linux/pm_runtime.h>
26 #include <linux/property.h>
27 #include <linux/regmap.h>
28 #include <linux/swab.h>
29 #include <linux/types.h>
30 #include <linux/units.h>
31
32 #define DEFAULT_SYMBOL_NAMESPACE        "I2C_DW_COMMON"
33
34 #include "i2c-designware-core.h"
35
36 static const char *const abort_sources[] = {
37         [ABRT_7B_ADDR_NOACK] =
38                 "slave address not acknowledged (7bit mode)",
39         [ABRT_10ADDR1_NOACK] =
40                 "first address byte not acknowledged (10bit mode)",
41         [ABRT_10ADDR2_NOACK] =
42                 "second address byte not acknowledged (10bit mode)",
43         [ABRT_TXDATA_NOACK] =
44                 "data not acknowledged",
45         [ABRT_GCALL_NOACK] =
46                 "no acknowledgement for a general call",
47         [ABRT_GCALL_READ] =
48                 "read after general call",
49         [ABRT_SBYTE_ACKDET] =
50                 "start byte acknowledged",
51         [ABRT_SBYTE_NORSTRT] =
52                 "trying to send start byte when restart is disabled",
53         [ABRT_10B_RD_NORSTRT] =
54                 "trying to read when restart is disabled (10bit mode)",
55         [ABRT_MASTER_DIS] =
56                 "trying to use disabled adapter",
57         [ARB_LOST] =
58                 "lost arbitration",
59         [ABRT_SLAVE_FLUSH_TXFIFO] =
60                 "read command so flush old data in the TX FIFO",
61         [ABRT_SLAVE_ARBLOST] =
62                 "slave lost the bus while transmitting data to a remote master",
63         [ABRT_SLAVE_RD_INTX] =
64                 "incorrect slave-transmitter mode configuration",
65 };
66
67 static int dw_reg_read(void *context, unsigned int reg, unsigned int *val)
68 {
69         struct dw_i2c_dev *dev = context;
70
71         *val = readl(dev->base + reg);
72
73         return 0;
74 }
75
76 static int dw_reg_write(void *context, unsigned int reg, unsigned int val)
77 {
78         struct dw_i2c_dev *dev = context;
79
80         writel(val, dev->base + reg);
81
82         return 0;
83 }
84
85 static int dw_reg_read_swab(void *context, unsigned int reg, unsigned int *val)
86 {
87         struct dw_i2c_dev *dev = context;
88
89         *val = swab32(readl(dev->base + reg));
90
91         return 0;
92 }
93
94 static int dw_reg_write_swab(void *context, unsigned int reg, unsigned int val)
95 {
96         struct dw_i2c_dev *dev = context;
97
98         writel(swab32(val), dev->base + reg);
99
100         return 0;
101 }
102
103 static int dw_reg_read_word(void *context, unsigned int reg, unsigned int *val)
104 {
105         struct dw_i2c_dev *dev = context;
106
107         *val = readw(dev->base + reg) |
108                 (readw(dev->base + reg + 2) << 16);
109
110         return 0;
111 }
112
113 static int dw_reg_write_word(void *context, unsigned int reg, unsigned int val)
114 {
115         struct dw_i2c_dev *dev = context;
116
117         writew(val, dev->base + reg);
118         writew(val >> 16, dev->base + reg + 2);
119
120         return 0;
121 }
122
123 /**
124  * i2c_dw_init_regmap() - Initialize registers map
125  * @dev: device private data
126  *
127  * Autodetects needed register access mode and creates the regmap with
128  * corresponding read/write callbacks. This must be called before doing any
129  * other register access.
130  *
131  * Return: 0 on success, or negative errno otherwise.
132  */
133 int i2c_dw_init_regmap(struct dw_i2c_dev *dev)
134 {
135         struct regmap_config map_cfg = {
136                 .reg_bits = 32,
137                 .val_bits = 32,
138                 .reg_stride = 4,
139                 .disable_locking = true,
140                 .reg_read = dw_reg_read,
141                 .reg_write = dw_reg_write,
142                 .max_register = DW_IC_COMP_TYPE,
143         };
144         u32 reg;
145         int ret;
146
147         /*
148          * Skip detecting the registers map configuration if the regmap has
149          * already been provided by a higher code.
150          */
151         if (dev->map)
152                 return 0;
153
154         ret = i2c_dw_acquire_lock(dev);
155         if (ret)
156                 return ret;
157
158         reg = readl(dev->base + DW_IC_COMP_TYPE);
159         i2c_dw_release_lock(dev);
160
161         if ((dev->flags & MODEL_MASK) == MODEL_AMD_NAVI_GPU)
162                 map_cfg.max_register = AMD_UCSI_INTR_REG;
163
164         if (reg == swab32(DW_IC_COMP_TYPE_VALUE)) {
165                 map_cfg.reg_read = dw_reg_read_swab;
166                 map_cfg.reg_write = dw_reg_write_swab;
167         } else if (reg == (DW_IC_COMP_TYPE_VALUE & 0x0000ffff)) {
168                 map_cfg.reg_read = dw_reg_read_word;
169                 map_cfg.reg_write = dw_reg_write_word;
170         } else if (reg != DW_IC_COMP_TYPE_VALUE) {
171                 dev_err(dev->dev,
172                         "Unknown Synopsys component type: 0x%08x\n", reg);
173                 return -ENODEV;
174         }
175
176         /*
177          * Note we'll check the return value of the regmap IO accessors only
178          * at the probe stage. The rest of the code won't do this because
179          * basically we have MMIO-based regmap, so none of the read/write methods
180          * can fail.
181          */
182         dev->map = devm_regmap_init(dev->dev, NULL, dev, &map_cfg);
183         if (IS_ERR(dev->map)) {
184                 dev_err(dev->dev, "Failed to init the registers map\n");
185                 return PTR_ERR(dev->map);
186         }
187
188         return 0;
189 }
190
191 static const u32 supported_speeds[] = {
192         I2C_MAX_HIGH_SPEED_MODE_FREQ,
193         I2C_MAX_FAST_MODE_PLUS_FREQ,
194         I2C_MAX_FAST_MODE_FREQ,
195         I2C_MAX_STANDARD_MODE_FREQ,
196 };
197
198 static int i2c_dw_validate_speed(struct dw_i2c_dev *dev)
199 {
200         struct i2c_timings *t = &dev->timings;
201         unsigned int i;
202
203         /*
204          * Only standard mode at 100kHz, fast mode at 400kHz,
205          * fast mode plus at 1MHz and high speed mode at 3.4MHz are supported.
206          */
207         for (i = 0; i < ARRAY_SIZE(supported_speeds); i++) {
208                 if (t->bus_freq_hz == supported_speeds[i])
209                         return 0;
210         }
211
212         dev_err(dev->dev,
213                 "%d Hz is unsupported, only 100kHz, 400kHz, 1MHz and 3.4MHz are supported\n",
214                 t->bus_freq_hz);
215
216         return -EINVAL;
217 }
218
219 #ifdef CONFIG_OF
220
221 #include <linux/platform_device.h>
222
223 #define MSCC_ICPU_CFG_TWI_DELAY         0x0
224 #define MSCC_ICPU_CFG_TWI_DELAY_ENABLE  BIT(0)
225 #define MSCC_ICPU_CFG_TWI_SPIKE_FILTER  0x4
226
227 static int mscc_twi_set_sda_hold_time(struct dw_i2c_dev *dev)
228 {
229         writel((dev->sda_hold_time << 1) | MSCC_ICPU_CFG_TWI_DELAY_ENABLE,
230                dev->ext + MSCC_ICPU_CFG_TWI_DELAY);
231
232         return 0;
233 }
234
235 static void i2c_dw_of_configure(struct device *device)
236 {
237         struct platform_device *pdev = to_platform_device(device);
238         struct dw_i2c_dev *dev = dev_get_drvdata(device);
239
240         switch (dev->flags & MODEL_MASK) {
241         case MODEL_MSCC_OCELOT:
242                 dev->ext = devm_platform_ioremap_resource(pdev, 1);
243                 if (!IS_ERR(dev->ext))
244                         dev->set_sda_hold_time = mscc_twi_set_sda_hold_time;
245                 break;
246         default:
247                 break;
248         }
249 }
250
251 #else   /* CONFIG_OF */
252
253 static inline void i2c_dw_of_configure(struct device *device) { }
254
255 #endif  /* CONFIG_OF */
256
257 #ifdef CONFIG_ACPI
258
259 #include <linux/dmi.h>
260
261 /*
262  * The HCNT/LCNT information coming from ACPI should be the most accurate
263  * for given platform. However, some systems get it wrong. On such systems
264  * we get better results by calculating those based on the input clock.
265  */
266 static const struct dmi_system_id i2c_dw_no_acpi_params[] = {
267         {
268                 .ident = "Dell Inspiron 7348",
269                 .matches = {
270                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
271                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7348"),
272                 },
273         },
274         {}
275 };
276
277 static void i2c_dw_acpi_params(struct device *device, char method[],
278                                u16 *hcnt, u16 *lcnt, u32 *sda_hold)
279 {
280         struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
281         acpi_handle handle = ACPI_HANDLE(device);
282         union acpi_object *obj;
283
284         if (dmi_check_system(i2c_dw_no_acpi_params))
285                 return;
286
287         if (ACPI_FAILURE(acpi_evaluate_object(handle, method, NULL, &buf)))
288                 return;
289
290         obj = (union acpi_object *)buf.pointer;
291         if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 3) {
292                 const union acpi_object *objs = obj->package.elements;
293
294                 *hcnt = (u16)objs[0].integer.value;
295                 *lcnt = (u16)objs[1].integer.value;
296                 *sda_hold = (u32)objs[2].integer.value;
297         }
298
299         kfree(buf.pointer);
300 }
301
302 static void i2c_dw_acpi_configure(struct device *device)
303 {
304         struct dw_i2c_dev *dev = dev_get_drvdata(device);
305         struct i2c_timings *t = &dev->timings;
306         u32 ss_ht = 0, fp_ht = 0, hs_ht = 0, fs_ht = 0;
307
308         /*
309          * Try to get SDA hold time and *CNT values from an ACPI method for
310          * selected speed modes.
311          */
312         i2c_dw_acpi_params(device, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt, &ss_ht);
313         i2c_dw_acpi_params(device, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt, &fs_ht);
314         i2c_dw_acpi_params(device, "FPCN", &dev->fp_hcnt, &dev->fp_lcnt, &fp_ht);
315         i2c_dw_acpi_params(device, "HSCN", &dev->hs_hcnt, &dev->hs_lcnt, &hs_ht);
316
317         switch (t->bus_freq_hz) {
318         case I2C_MAX_STANDARD_MODE_FREQ:
319                 dev->sda_hold_time = ss_ht;
320                 break;
321         case I2C_MAX_FAST_MODE_PLUS_FREQ:
322                 dev->sda_hold_time = fp_ht;
323                 break;
324         case I2C_MAX_HIGH_SPEED_MODE_FREQ:
325                 dev->sda_hold_time = hs_ht;
326                 break;
327         case I2C_MAX_FAST_MODE_FREQ:
328         default:
329                 dev->sda_hold_time = fs_ht;
330                 break;
331         }
332 }
333
334 static u32 i2c_dw_acpi_round_bus_speed(struct device *device)
335 {
336         u32 acpi_speed;
337         int i;
338
339         acpi_speed = i2c_acpi_find_bus_speed(device);
340         /*
341          * Some DSDTs use a non standard speed, round down to the lowest
342          * standard speed.
343          */
344         for (i = 0; i < ARRAY_SIZE(supported_speeds); i++) {
345                 if (acpi_speed >= supported_speeds[i])
346                         return supported_speeds[i];
347         }
348
349         return 0;
350 }
351
352 #else   /* CONFIG_ACPI */
353
354 static inline void i2c_dw_acpi_configure(struct device *device) { }
355
356 static inline u32 i2c_dw_acpi_round_bus_speed(struct device *device) { return 0; }
357
358 #endif  /* CONFIG_ACPI */
359
360 static void i2c_dw_adjust_bus_speed(struct dw_i2c_dev *dev)
361 {
362         u32 acpi_speed = i2c_dw_acpi_round_bus_speed(dev->dev);
363         struct i2c_timings *t = &dev->timings;
364
365         /*
366          * Find bus speed from the "clock-frequency" device property, ACPI
367          * or by using fast mode if neither is set.
368          */
369         if (acpi_speed && t->bus_freq_hz)
370                 t->bus_freq_hz = min(t->bus_freq_hz, acpi_speed);
371         else if (acpi_speed || t->bus_freq_hz)
372                 t->bus_freq_hz = max(t->bus_freq_hz, acpi_speed);
373         else
374                 t->bus_freq_hz = I2C_MAX_FAST_MODE_FREQ;
375 }
376
377 int i2c_dw_fw_parse_and_configure(struct dw_i2c_dev *dev)
378 {
379         struct i2c_timings *t = &dev->timings;
380         struct device *device = dev->dev;
381         struct fwnode_handle *fwnode = dev_fwnode(device);
382
383         i2c_parse_fw_timings(device, t, false);
384
385         if (device_property_read_u32(device, "snps,bus-capacitance-pf", &dev->bus_capacitance_pF))
386                 dev->bus_capacitance_pF = 100;
387
388         dev->clk_freq_optimized = device_property_read_bool(device, "snps,clk-freq-optimized");
389
390         i2c_dw_adjust_bus_speed(dev);
391
392         if (is_of_node(fwnode))
393                 i2c_dw_of_configure(device);
394         else if (is_acpi_node(fwnode))
395                 i2c_dw_acpi_configure(device);
396
397         return i2c_dw_validate_speed(dev);
398 }
399 EXPORT_SYMBOL_GPL(i2c_dw_fw_parse_and_configure);
400
401 static u32 i2c_dw_read_scl_reg(struct dw_i2c_dev *dev, u32 reg)
402 {
403         u32 val;
404         int ret;
405
406         ret = i2c_dw_acquire_lock(dev);
407         if (ret)
408                 return 0;
409
410         ret = regmap_read(dev->map, reg, &val);
411         i2c_dw_release_lock(dev);
412
413         return ret ? 0 : val;
414 }
415
416 u32 i2c_dw_scl_hcnt(struct dw_i2c_dev *dev, unsigned int reg, u32 ic_clk,
417                     u32 tSYMBOL, u32 tf, int offset)
418 {
419         if (!ic_clk)
420                 return i2c_dw_read_scl_reg(dev, reg);
421
422         /*
423          * Conditional expression:
424          *
425          *   IC_[FS]S_SCL_HCNT + 3 >= IC_CLK * (tHD;STA + tf)
426          *
427          * This is just experimental rule; the tHD;STA period turned
428          * out to be proportinal to (_HCNT + 3).  With this setting,
429          * we could meet both tHIGH and tHD;STA timing specs.
430          *
431          * If unsure, you'd better to take this alternative.
432          *
433          * The reason why we need to take into account "tf" here,
434          * is the same as described in i2c_dw_scl_lcnt().
435          */
436         return DIV_ROUND_CLOSEST_ULL((u64)ic_clk * (tSYMBOL + tf), MICRO) - 3 + offset;
437 }
438
439 u32 i2c_dw_scl_lcnt(struct dw_i2c_dev *dev, unsigned int reg, u32 ic_clk,
440                     u32 tLOW, u32 tf, int offset)
441 {
442         if (!ic_clk)
443                 return i2c_dw_read_scl_reg(dev, reg);
444
445         /*
446          * Conditional expression:
447          *
448          *   IC_[FS]S_SCL_LCNT + 1 >= IC_CLK * (tLOW + tf)
449          *
450          * DW I2C core starts counting the SCL CNTs for the LOW period
451          * of the SCL clock (tLOW) as soon as it pulls the SCL line.
452          * In order to meet the tLOW timing spec, we need to take into
453          * account the fall time of SCL signal (tf).  Default tf value
454          * should be 0.3 us, for safety.
455          */
456         return DIV_ROUND_CLOSEST_ULL((u64)ic_clk * (tLOW + tf), MICRO) - 1 + offset;
457 }
458
459 int i2c_dw_set_sda_hold(struct dw_i2c_dev *dev)
460 {
461         unsigned int reg;
462         int ret;
463
464         ret = i2c_dw_acquire_lock(dev);
465         if (ret)
466                 return ret;
467
468         /* Configure SDA Hold Time if required */
469         ret = regmap_read(dev->map, DW_IC_COMP_VERSION, &reg);
470         if (ret)
471                 goto err_release_lock;
472
473         if (reg >= DW_IC_SDA_HOLD_MIN_VERS) {
474                 if (!dev->sda_hold_time) {
475                         /* Keep previous hold time setting if no one set it */
476                         ret = regmap_read(dev->map, DW_IC_SDA_HOLD,
477                                           &dev->sda_hold_time);
478                         if (ret)
479                                 goto err_release_lock;
480                 }
481
482                 /*
483                  * Workaround for avoiding TX arbitration lost in case I2C
484                  * slave pulls SDA down "too quickly" after falling edge of
485                  * SCL by enabling non-zero SDA RX hold. Specification says it
486                  * extends incoming SDA low to high transition while SCL is
487                  * high but it appears to help also above issue.
488                  */
489                 if (!(dev->sda_hold_time & DW_IC_SDA_HOLD_RX_MASK))
490                         dev->sda_hold_time |= 1 << DW_IC_SDA_HOLD_RX_SHIFT;
491
492                 dev_dbg(dev->dev, "SDA Hold Time TX:RX = %d:%d\n",
493                         dev->sda_hold_time & ~(u32)DW_IC_SDA_HOLD_RX_MASK,
494                         dev->sda_hold_time >> DW_IC_SDA_HOLD_RX_SHIFT);
495         } else if (dev->set_sda_hold_time) {
496                 dev->set_sda_hold_time(dev);
497         } else if (dev->sda_hold_time) {
498                 dev_warn(dev->dev,
499                         "Hardware too old to adjust SDA hold time.\n");
500                 dev->sda_hold_time = 0;
501         }
502
503 err_release_lock:
504         i2c_dw_release_lock(dev);
505
506         return ret;
507 }
508
509 void __i2c_dw_disable(struct dw_i2c_dev *dev)
510 {
511         struct i2c_timings *t = &dev->timings;
512         unsigned int raw_intr_stats, ic_stats;
513         unsigned int enable;
514         int timeout = 100;
515         bool abort_needed;
516         unsigned int status;
517         int ret;
518
519         regmap_read(dev->map, DW_IC_RAW_INTR_STAT, &raw_intr_stats);
520         regmap_read(dev->map, DW_IC_STATUS, &ic_stats);
521         regmap_read(dev->map, DW_IC_ENABLE, &enable);
522
523         abort_needed = (raw_intr_stats & DW_IC_INTR_MST_ON_HOLD) ||
524                         (ic_stats & DW_IC_STATUS_MASTER_HOLD_TX_FIFO_EMPTY);
525         if (abort_needed) {
526                 if (!(enable & DW_IC_ENABLE_ENABLE)) {
527                         regmap_write(dev->map, DW_IC_ENABLE, DW_IC_ENABLE_ENABLE);
528                         /*
529                          * Wait 10 times the signaling period of the highest I2C
530                          * transfer supported by the driver (for 400KHz this is
531                          * 25us) to ensure the I2C ENABLE bit is already set
532                          * as described in the DesignWare I2C databook.
533                          */
534                         fsleep(DIV_ROUND_CLOSEST_ULL(10 * MICRO, t->bus_freq_hz));
535                         /* Set ENABLE bit before setting ABORT */
536                         enable |= DW_IC_ENABLE_ENABLE;
537                 }
538
539                 regmap_write(dev->map, DW_IC_ENABLE, enable | DW_IC_ENABLE_ABORT);
540                 ret = regmap_read_poll_timeout(dev->map, DW_IC_ENABLE, enable,
541                                                !(enable & DW_IC_ENABLE_ABORT), 10,
542                                                100);
543                 if (ret)
544                         dev_err(dev->dev, "timeout while trying to abort current transfer\n");
545         }
546
547         do {
548                 __i2c_dw_disable_nowait(dev);
549                 /*
550                  * The enable status register may be unimplemented, but
551                  * in that case this test reads zero and exits the loop.
552                  */
553                 regmap_read(dev->map, DW_IC_ENABLE_STATUS, &status);
554                 if ((status & 1) == 0)
555                         return;
556
557                 /*
558                  * Wait 10 times the signaling period of the highest I2C
559                  * transfer supported by the driver (for 400kHz this is
560                  * 25us) as described in the DesignWare I2C databook.
561                  */
562                 usleep_range(25, 250);
563         } while (timeout--);
564
565         dev_warn(dev->dev, "timeout in disabling adapter\n");
566 }
567
568 u32 i2c_dw_clk_rate(struct dw_i2c_dev *dev)
569 {
570         /*
571          * Clock is not necessary if we got LCNT/HCNT values directly from
572          * the platform code.
573          */
574         if (WARN_ON_ONCE(!dev->get_clk_rate_khz))
575                 return 0;
576         return dev->get_clk_rate_khz(dev);
577 }
578
579 int i2c_dw_prepare_clk(struct dw_i2c_dev *dev, bool prepare)
580 {
581         int ret;
582
583         if (prepare) {
584                 /* Optional interface clock */
585                 ret = clk_prepare_enable(dev->pclk);
586                 if (ret)
587                         return ret;
588
589                 ret = clk_prepare_enable(dev->clk);
590                 if (ret)
591                         clk_disable_unprepare(dev->pclk);
592
593                 return ret;
594         }
595
596         clk_disable_unprepare(dev->clk);
597         clk_disable_unprepare(dev->pclk);
598
599         return 0;
600 }
601 EXPORT_SYMBOL_GPL(i2c_dw_prepare_clk);
602
603 int i2c_dw_acquire_lock(struct dw_i2c_dev *dev)
604 {
605         int ret;
606
607         if (!dev->acquire_lock)
608                 return 0;
609
610         ret = dev->acquire_lock();
611         if (!ret)
612                 return 0;
613
614         dev_err(dev->dev, "couldn't acquire bus ownership\n");
615
616         return ret;
617 }
618
619 void i2c_dw_release_lock(struct dw_i2c_dev *dev)
620 {
621         if (dev->release_lock)
622                 dev->release_lock();
623 }
624
625 /*
626  * Waiting for bus not busy
627  */
628 int i2c_dw_wait_bus_not_busy(struct dw_i2c_dev *dev)
629 {
630         unsigned int status;
631         int ret;
632
633         ret = regmap_read_poll_timeout(dev->map, DW_IC_STATUS, status,
634                                        !(status & DW_IC_STATUS_ACTIVITY),
635                                        1100, 20000);
636         if (ret) {
637                 dev_warn(dev->dev, "timeout waiting for bus ready\n");
638
639                 i2c_recover_bus(&dev->adapter);
640
641                 regmap_read(dev->map, DW_IC_STATUS, &status);
642                 if (!(status & DW_IC_STATUS_ACTIVITY))
643                         ret = 0;
644         }
645
646         return ret;
647 }
648
649 int i2c_dw_handle_tx_abort(struct dw_i2c_dev *dev)
650 {
651         unsigned long abort_source = dev->abort_source;
652         int i;
653
654         if (abort_source & DW_IC_TX_ABRT_NOACK) {
655                 for_each_set_bit(i, &abort_source, ARRAY_SIZE(abort_sources))
656                         dev_dbg(dev->dev,
657                                 "%s: %s\n", __func__, abort_sources[i]);
658                 return -EREMOTEIO;
659         }
660
661         for_each_set_bit(i, &abort_source, ARRAY_SIZE(abort_sources))
662                 dev_err(dev->dev, "%s: %s\n", __func__, abort_sources[i]);
663
664         if (abort_source & DW_IC_TX_ARB_LOST)
665                 return -EAGAIN;
666         if (abort_source & DW_IC_TX_ABRT_GCALL_READ)
667                 return -EINVAL; /* wrong msgs[] data */
668
669         return -EIO;
670 }
671
672 int i2c_dw_set_fifo_size(struct dw_i2c_dev *dev)
673 {
674         u32 tx_fifo_depth, rx_fifo_depth;
675         unsigned int param;
676         int ret;
677
678         /* DW_IC_COMP_PARAM_1 not implement for IP issue */
679         if ((dev->flags & MODEL_MASK) == MODEL_WANGXUN_SP) {
680                 dev->tx_fifo_depth = TXGBE_TX_FIFO_DEPTH;
681                 dev->rx_fifo_depth = TXGBE_RX_FIFO_DEPTH;
682
683                 return 0;
684         }
685
686         /*
687          * Try to detect the FIFO depth if not set by interface driver,
688          * the depth could be from 2 to 256 from HW spec.
689          */
690         ret = i2c_dw_acquire_lock(dev);
691         if (ret)
692                 return ret;
693
694         ret = regmap_read(dev->map, DW_IC_COMP_PARAM_1, &param);
695         i2c_dw_release_lock(dev);
696         if (ret)
697                 return ret;
698
699         tx_fifo_depth = ((param >> 16) & 0xff) + 1;
700         rx_fifo_depth = ((param >> 8)  & 0xff) + 1;
701         if (!dev->tx_fifo_depth) {
702                 dev->tx_fifo_depth = tx_fifo_depth;
703                 dev->rx_fifo_depth = rx_fifo_depth;
704         } else if (tx_fifo_depth >= 2) {
705                 dev->tx_fifo_depth = min_t(u32, dev->tx_fifo_depth,
706                                 tx_fifo_depth);
707                 dev->rx_fifo_depth = min_t(u32, dev->rx_fifo_depth,
708                                 rx_fifo_depth);
709         }
710
711         return 0;
712 }
713
714 u32 i2c_dw_func(struct i2c_adapter *adap)
715 {
716         struct dw_i2c_dev *dev = i2c_get_adapdata(adap);
717
718         return dev->functionality;
719 }
720
721 void i2c_dw_disable(struct dw_i2c_dev *dev)
722 {
723         unsigned int dummy;
724         int ret;
725
726         ret = i2c_dw_acquire_lock(dev);
727         if (ret)
728                 return;
729
730         /* Disable controller */
731         __i2c_dw_disable(dev);
732
733         /* Disable all interrupts */
734         __i2c_dw_write_intr_mask(dev, 0);
735         regmap_read(dev->map, DW_IC_CLR_INTR, &dummy);
736
737         i2c_dw_release_lock(dev);
738 }
739 EXPORT_SYMBOL_GPL(i2c_dw_disable);
740
741 int i2c_dw_probe(struct dw_i2c_dev *dev)
742 {
743         device_set_node(&dev->adapter.dev, dev_fwnode(dev->dev));
744
745         switch (dev->mode) {
746         case DW_IC_SLAVE:
747                 return i2c_dw_probe_slave(dev);
748         case DW_IC_MASTER:
749                 return i2c_dw_probe_master(dev);
750         default:
751                 dev_err(dev->dev, "Wrong operation mode: %d\n", dev->mode);
752                 return -EINVAL;
753         }
754 }
755 EXPORT_SYMBOL_GPL(i2c_dw_probe);
756
757 static int i2c_dw_prepare(struct device *device)
758 {
759         /*
760          * If the ACPI companion device object is present for this device,
761          * it may be accessed during suspend and resume of other devices via
762          * I2C operation regions, so tell the PM core and middle layers to
763          * avoid skipping system suspend/resume callbacks for it in that case.
764          */
765         return !has_acpi_companion(device);
766 }
767
768 static int i2c_dw_runtime_suspend(struct device *device)
769 {
770         struct dw_i2c_dev *dev = dev_get_drvdata(device);
771
772         if (dev->shared_with_punit)
773                 return 0;
774
775         i2c_dw_disable(dev);
776         i2c_dw_prepare_clk(dev, false);
777
778         return 0;
779 }
780
781 static int i2c_dw_suspend(struct device *device)
782 {
783         struct dw_i2c_dev *dev = dev_get_drvdata(device);
784
785         i2c_mark_adapter_suspended(&dev->adapter);
786
787         return i2c_dw_runtime_suspend(device);
788 }
789
790 static int i2c_dw_runtime_resume(struct device *device)
791 {
792         struct dw_i2c_dev *dev = dev_get_drvdata(device);
793
794         if (!dev->shared_with_punit)
795                 i2c_dw_prepare_clk(dev, true);
796
797         dev->init(dev);
798
799         return 0;
800 }
801
802 static int i2c_dw_resume(struct device *device)
803 {
804         struct dw_i2c_dev *dev = dev_get_drvdata(device);
805
806         i2c_dw_runtime_resume(device);
807         i2c_mark_adapter_resumed(&dev->adapter);
808
809         return 0;
810 }
811
812 EXPORT_GPL_DEV_PM_OPS(i2c_dw_dev_pm_ops) = {
813         .prepare = pm_sleep_ptr(i2c_dw_prepare),
814         LATE_SYSTEM_SLEEP_PM_OPS(i2c_dw_suspend, i2c_dw_resume)
815         RUNTIME_PM_OPS(i2c_dw_runtime_suspend, i2c_dw_runtime_resume, NULL)
816 };
817
818 MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter core");
819 MODULE_LICENSE("GPL");
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