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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-provider.h>
13#include <linux/clk.h>
14#include <linux/delay.h>
15#include <linux/dmi.h>
16#include <linux/err.h>
17#include <linux/errno.h>
18#include <linux/i2c.h>
19#include <linux/interrupt.h>
20#include <linux/io.h>
21#include <linux/kernel.h>
22#include <linux/mfd/syscon.h>
23#include <linux/module.h>
24#include <linux/of.h>
25#include <linux/platform_device.h>
26#include <linux/pm.h>
27#include <linux/pm_runtime.h>
28#include <linux/property.h>
29#include <linux/regmap.h>
30#include <linux/reset.h>
31#include <linux/sched.h>
32#include <linux/slab.h>
33#include <linux/suspend.h>
34#include <linux/units.h>
35
36#include "i2c-designware-core.h"
37
38static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
39{
40 return clk_get_rate(dev->clk) / KILO;
41}
42
43#ifdef CONFIG_ACPI
44static const struct acpi_device_id dw_i2c_acpi_match[] = {
45 { "INT33C2", 0 },
46 { "INT33C3", 0 },
47 { "INT3432", 0 },
48 { "INT3433", 0 },
49 { "80860F41", ACCESS_NO_IRQ_SUSPEND },
50 { "808622C1", ACCESS_NO_IRQ_SUSPEND },
51 { "AMD0010", ACCESS_INTR_MASK },
52 { "AMDI0010", ACCESS_INTR_MASK },
53 { "AMDI0019", ACCESS_INTR_MASK | ARBITRATION_SEMAPHORE },
54 { "AMDI0510", 0 },
55 { "APMC0D0F", 0 },
56 { "HISI02A1", 0 },
57 { "HISI02A2", 0 },
58 { "HISI02A3", 0 },
59 { "HYGO0010", ACCESS_INTR_MASK },
60 { }
61};
62MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match);
63#endif
64
65#ifdef CONFIG_OF
66#define BT1_I2C_CTL 0x100
67#define BT1_I2C_CTL_ADDR_MASK GENMASK(7, 0)
68#define BT1_I2C_CTL_WR BIT(8)
69#define BT1_I2C_CTL_GO BIT(31)
70#define BT1_I2C_DI 0x104
71#define BT1_I2C_DO 0x108
72
73static int bt1_i2c_read(void *context, unsigned int reg, unsigned int *val)
74{
75 struct dw_i2c_dev *dev = context;
76 int ret;
77
78 /*
79 * Note these methods shouldn't ever fail because the system controller
80 * registers are memory mapped. We check the return value just in case.
81 */
82 ret = regmap_write(dev->sysmap, BT1_I2C_CTL,
83 BT1_I2C_CTL_GO | (reg & BT1_I2C_CTL_ADDR_MASK));
84 if (ret)
85 return ret;
86
87 return regmap_read(dev->sysmap, BT1_I2C_DO, val);
88}
89
90static int bt1_i2c_write(void *context, unsigned int reg, unsigned int val)
91{
92 struct dw_i2c_dev *dev = context;
93 int ret;
94
95 ret = regmap_write(dev->sysmap, BT1_I2C_DI, val);
96 if (ret)
97 return ret;
98
99 return regmap_write(dev->sysmap, BT1_I2C_CTL,
100 BT1_I2C_CTL_GO | BT1_I2C_CTL_WR | (reg & BT1_I2C_CTL_ADDR_MASK));
101}
102
103static struct regmap_config bt1_i2c_cfg = {
104 .reg_bits = 32,
105 .val_bits = 32,
106 .reg_stride = 4,
107 .fast_io = true,
108 .reg_read = bt1_i2c_read,
109 .reg_write = bt1_i2c_write,
110 .max_register = DW_IC_COMP_TYPE,
111};
112
113static int bt1_i2c_request_regs(struct dw_i2c_dev *dev)
114{
115 dev->sysmap = syscon_node_to_regmap(dev->dev->of_node->parent);
116 if (IS_ERR(dev->sysmap))
117 return PTR_ERR(dev->sysmap);
118
119 dev->map = devm_regmap_init(dev->dev, NULL, dev, &bt1_i2c_cfg);
120 return PTR_ERR_OR_ZERO(dev->map);
121}
122
123#define MSCC_ICPU_CFG_TWI_DELAY 0x0
124#define MSCC_ICPU_CFG_TWI_DELAY_ENABLE BIT(0)
125#define MSCC_ICPU_CFG_TWI_SPIKE_FILTER 0x4
126
127static int mscc_twi_set_sda_hold_time(struct dw_i2c_dev *dev)
128{
129 writel((dev->sda_hold_time << 1) | MSCC_ICPU_CFG_TWI_DELAY_ENABLE,
130 dev->ext + MSCC_ICPU_CFG_TWI_DELAY);
131
132 return 0;
133}
134
135static int dw_i2c_of_configure(struct platform_device *pdev)
136{
137 struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
138
139 switch (dev->flags & MODEL_MASK) {
140 case MODEL_MSCC_OCELOT:
141 dev->ext = devm_platform_ioremap_resource(pdev, 1);
142 if (!IS_ERR(dev->ext))
143 dev->set_sda_hold_time = mscc_twi_set_sda_hold_time;
144 break;
145 default:
146 break;
147 }
148
149 return 0;
150}
151
152static const struct of_device_id dw_i2c_of_match[] = {
153 { .compatible = "snps,designware-i2c", },
154 { .compatible = "mscc,ocelot-i2c", .data = (void *)MODEL_MSCC_OCELOT },
155 { .compatible = "baikal,bt1-sys-i2c", .data = (void *)MODEL_BAIKAL_BT1 },
156 {},
157};
158MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
159#else
160static int bt1_i2c_request_regs(struct dw_i2c_dev *dev)
161{
162 return -ENODEV;
163}
164
165static inline int dw_i2c_of_configure(struct platform_device *pdev)
166{
167 return -ENODEV;
168}
169#endif
170
171static int txgbe_i2c_request_regs(struct dw_i2c_dev *dev)
172{
173 dev->map = dev_get_regmap(dev->dev->parent, NULL);
174 if (!dev->map)
175 return -ENODEV;
176
177 return 0;
178}
179
180static void dw_i2c_plat_pm_cleanup(struct dw_i2c_dev *dev)
181{
182 pm_runtime_disable(dev->dev);
183
184 if (dev->shared_with_punit)
185 pm_runtime_put_noidle(dev->dev);
186}
187
188static int dw_i2c_plat_request_regs(struct dw_i2c_dev *dev)
189{
190 struct platform_device *pdev = to_platform_device(dev->dev);
191 int ret;
192
193 switch (dev->flags & MODEL_MASK) {
194 case MODEL_BAIKAL_BT1:
195 ret = bt1_i2c_request_regs(dev);
196 break;
197 case MODEL_WANGXUN_SP:
198 ret = txgbe_i2c_request_regs(dev);
199 break;
200 default:
201 dev->base = devm_platform_ioremap_resource(pdev, 0);
202 ret = PTR_ERR_OR_ZERO(dev->base);
203 break;
204 }
205
206 return ret;
207}
208
209static const struct dmi_system_id dw_i2c_hwmon_class_dmi[] = {
210 {
211 .ident = "Qtechnology QT5222",
212 .matches = {
213 DMI_MATCH(DMI_SYS_VENDOR, "Qtechnology"),
214 DMI_MATCH(DMI_PRODUCT_NAME, "QT5222"),
215 },
216 },
217 { } /* terminate list */
218};
219
220static const struct i2c_dw_semaphore_callbacks i2c_dw_semaphore_cb_table[] = {
221#ifdef CONFIG_I2C_DESIGNWARE_BAYTRAIL
222 {
223 .probe = i2c_dw_baytrail_probe_lock_support,
224 },
225#endif
226#ifdef CONFIG_I2C_DESIGNWARE_AMDPSP
227 {
228 .probe = i2c_dw_amdpsp_probe_lock_support,
229 },
230#endif
231 {}
232};
233
234static int i2c_dw_probe_lock_support(struct dw_i2c_dev *dev)
235{
236 const struct i2c_dw_semaphore_callbacks *ptr;
237 int i = 0;
238 int ret;
239
240 ptr = i2c_dw_semaphore_cb_table;
241
242 dev->semaphore_idx = -1;
243
244 while (ptr->probe) {
245 ret = ptr->probe(dev);
246 if (ret) {
247 /*
248 * If there is no semaphore device attached to this
249 * controller, we shouldn't abort general i2c_controller
250 * probe.
251 */
252 if (ret != -ENODEV)
253 return ret;
254
255 i++;
256 ptr++;
257 continue;
258 }
259
260 dev->semaphore_idx = i;
261 break;
262 }
263
264 return 0;
265}
266
267static void i2c_dw_remove_lock_support(struct dw_i2c_dev *dev)
268{
269 if (dev->semaphore_idx < 0)
270 return;
271
272 if (i2c_dw_semaphore_cb_table[dev->semaphore_idx].remove)
273 i2c_dw_semaphore_cb_table[dev->semaphore_idx].remove(dev);
274}
275
276static int dw_i2c_plat_probe(struct platform_device *pdev)
277{
278 struct i2c_adapter *adap;
279 struct dw_i2c_dev *dev;
280 struct i2c_timings *t;
281 int irq, ret;
282
283 irq = platform_get_irq(pdev, 0);
284 if (irq < 0)
285 return irq;
286
287 dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
288 if (!dev)
289 return -ENOMEM;
290
291 dev->flags = (uintptr_t)device_get_match_data(&pdev->dev);
292 if (device_property_present(&pdev->dev, "wx,i2c-snps-model"))
293 dev->flags = MODEL_WANGXUN_SP;
294
295 dev->dev = &pdev->dev;
296 dev->irq = irq;
297 platform_set_drvdata(pdev, dev);
298
299 ret = dw_i2c_plat_request_regs(dev);
300 if (ret)
301 return ret;
302
303 dev->rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
304 if (IS_ERR(dev->rst))
305 return PTR_ERR(dev->rst);
306
307 reset_control_deassert(dev->rst);
308
309 t = &dev->timings;
310 i2c_parse_fw_timings(&pdev->dev, t, false);
311
312 i2c_dw_adjust_bus_speed(dev);
313
314 if (pdev->dev.of_node)
315 dw_i2c_of_configure(pdev);
316
317 if (has_acpi_companion(&pdev->dev))
318 i2c_dw_acpi_configure(&pdev->dev);
319
320 ret = i2c_dw_validate_speed(dev);
321 if (ret)
322 goto exit_reset;
323
324 ret = i2c_dw_probe_lock_support(dev);
325 if (ret)
326 goto exit_reset;
327
328 i2c_dw_configure(dev);
329
330 /* Optional interface clock */
331 dev->pclk = devm_clk_get_optional(&pdev->dev, "pclk");
332 if (IS_ERR(dev->pclk)) {
333 ret = PTR_ERR(dev->pclk);
334 goto exit_reset;
335 }
336
337 dev->clk = devm_clk_get_optional(&pdev->dev, NULL);
338 if (IS_ERR(dev->clk)) {
339 ret = PTR_ERR(dev->clk);
340 goto exit_reset;
341 }
342
343 ret = i2c_dw_prepare_clk(dev, true);
344 if (ret)
345 goto exit_reset;
346
347 if (dev->clk) {
348 u64 clk_khz;
349
350 dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
351 clk_khz = dev->get_clk_rate_khz(dev);
352
353 if (!dev->sda_hold_time && t->sda_hold_ns)
354 dev->sda_hold_time =
355 DIV_S64_ROUND_CLOSEST(clk_khz * t->sda_hold_ns, MICRO);
356 }
357
358 adap = &dev->adapter;
359 adap->owner = THIS_MODULE;
360 adap->class = dmi_check_system(dw_i2c_hwmon_class_dmi) ?
361 I2C_CLASS_HWMON : I2C_CLASS_DEPRECATED;
362 ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
363 adap->dev.of_node = pdev->dev.of_node;
364 adap->nr = -1;
365
366 if (dev->flags & ACCESS_NO_IRQ_SUSPEND) {
367 dev_pm_set_driver_flags(&pdev->dev,
368 DPM_FLAG_SMART_PREPARE);
369 } else {
370 dev_pm_set_driver_flags(&pdev->dev,
371 DPM_FLAG_SMART_PREPARE |
372 DPM_FLAG_SMART_SUSPEND);
373 }
374
375 device_enable_async_suspend(&pdev->dev);
376
377 /* The code below assumes runtime PM to be disabled. */
378 WARN_ON(pm_runtime_enabled(&pdev->dev));
379
380 pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
381 pm_runtime_use_autosuspend(&pdev->dev);
382 pm_runtime_set_active(&pdev->dev);
383
384 if (dev->shared_with_punit)
385 pm_runtime_get_noresume(&pdev->dev);
386
387 pm_runtime_enable(&pdev->dev);
388
389 ret = i2c_dw_probe(dev);
390 if (ret)
391 goto exit_probe;
392
393 return ret;
394
395exit_probe:
396 dw_i2c_plat_pm_cleanup(dev);
397exit_reset:
398 reset_control_assert(dev->rst);
399 return ret;
400}
401
402static void dw_i2c_plat_remove(struct platform_device *pdev)
403{
404 struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
405
406 pm_runtime_get_sync(&pdev->dev);
407
408 i2c_del_adapter(&dev->adapter);
409
410 dev->disable(dev);
411
412 pm_runtime_dont_use_autosuspend(&pdev->dev);
413 pm_runtime_put_sync(&pdev->dev);
414 dw_i2c_plat_pm_cleanup(dev);
415
416 i2c_dw_remove_lock_support(dev);
417
418 reset_control_assert(dev->rst);
419}
420
421static int dw_i2c_plat_prepare(struct device *dev)
422{
423 /*
424 * If the ACPI companion device object is present for this device, it
425 * may be accessed during suspend and resume of other devices via I2C
426 * operation regions, so tell the PM core and middle layers to avoid
427 * skipping system suspend/resume callbacks for it in that case.
428 */
429 return !has_acpi_companion(dev);
430}
431
432static int dw_i2c_plat_runtime_suspend(struct device *dev)
433{
434 struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
435
436 if (i_dev->shared_with_punit)
437 return 0;
438
439 i_dev->disable(i_dev);
440 i2c_dw_prepare_clk(i_dev, false);
441
442 return 0;
443}
444
445static int dw_i2c_plat_suspend(struct device *dev)
446{
447 struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
448
449 i2c_mark_adapter_suspended(&i_dev->adapter);
450
451 return dw_i2c_plat_runtime_suspend(dev);
452}
453
454static int dw_i2c_plat_runtime_resume(struct device *dev)
455{
456 struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
457
458 if (!i_dev->shared_with_punit)
459 i2c_dw_prepare_clk(i_dev, true);
460
461 i_dev->init(i_dev);
462
463 return 0;
464}
465
466static int dw_i2c_plat_resume(struct device *dev)
467{
468 struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
469
470 dw_i2c_plat_runtime_resume(dev);
471 i2c_mark_adapter_resumed(&i_dev->adapter);
472
473 return 0;
474}
475
476static const struct dev_pm_ops dw_i2c_dev_pm_ops = {
477 .prepare = pm_sleep_ptr(dw_i2c_plat_prepare),
478 LATE_SYSTEM_SLEEP_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume)
479 RUNTIME_PM_OPS(dw_i2c_plat_runtime_suspend, dw_i2c_plat_runtime_resume, NULL)
480};
481
482/* Work with hotplug and coldplug */
483MODULE_ALIAS("platform:i2c_designware");
484
485static struct platform_driver dw_i2c_driver = {
486 .probe = dw_i2c_plat_probe,
487 .remove_new = dw_i2c_plat_remove,
488 .driver = {
489 .name = "i2c_designware",
490 .of_match_table = of_match_ptr(dw_i2c_of_match),
491 .acpi_match_table = ACPI_PTR(dw_i2c_acpi_match),
492 .pm = pm_ptr(&dw_i2c_dev_pm_ops),
493 },
494};
495
496static int __init dw_i2c_init_driver(void)
497{
498 return platform_driver_register(&dw_i2c_driver);
499}
500subsys_initcall(dw_i2c_init_driver);
501
502static void __exit dw_i2c_exit_driver(void)
503{
504 platform_driver_unregister(&dw_i2c_driver);
505}
506module_exit(dw_i2c_exit_driver);
507
508MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
509MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter");
510MODULE_LICENSE("GPL");
1/*
2 * Synopsys DesignWare I2C adapter driver (master only).
3 *
4 * Based on the TI DAVINCI I2C adapter driver.
5 *
6 * Copyright (C) 2006 Texas Instruments.
7 * Copyright (C) 2007 MontaVista Software Inc.
8 * Copyright (C) 2009 Provigent Ltd.
9 *
10 * ----------------------------------------------------------------------------
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 * ----------------------------------------------------------------------------
26 *
27 */
28#include <linux/kernel.h>
29#include <linux/module.h>
30#include <linux/delay.h>
31#include <linux/i2c.h>
32#include <linux/clk.h>
33#include <linux/errno.h>
34#include <linux/sched.h>
35#include <linux/err.h>
36#include <linux/interrupt.h>
37#include <linux/of_i2c.h>
38#include <linux/platform_device.h>
39#include <linux/pm.h>
40#include <linux/io.h>
41#include <linux/slab.h>
42#include "i2c-designware-core.h"
43
44static struct i2c_algorithm i2c_dw_algo = {
45 .master_xfer = i2c_dw_xfer,
46 .functionality = i2c_dw_func,
47};
48static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
49{
50 return clk_get_rate(dev->clk)/1000;
51}
52
53static int __devinit dw_i2c_probe(struct platform_device *pdev)
54{
55 struct dw_i2c_dev *dev;
56 struct i2c_adapter *adap;
57 struct resource *mem, *ioarea;
58 int irq, r;
59
60 /* NOTE: driver uses the static register mapping */
61 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
62 if (!mem) {
63 dev_err(&pdev->dev, "no mem resource?\n");
64 return -EINVAL;
65 }
66
67 irq = platform_get_irq(pdev, 0);
68 if (irq < 0) {
69 dev_err(&pdev->dev, "no irq resource?\n");
70 return irq; /* -ENXIO */
71 }
72
73 ioarea = request_mem_region(mem->start, resource_size(mem),
74 pdev->name);
75 if (!ioarea) {
76 dev_err(&pdev->dev, "I2C region already claimed\n");
77 return -EBUSY;
78 }
79
80 dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL);
81 if (!dev) {
82 r = -ENOMEM;
83 goto err_release_region;
84 }
85
86 init_completion(&dev->cmd_complete);
87 mutex_init(&dev->lock);
88 dev->dev = get_device(&pdev->dev);
89 dev->irq = irq;
90 platform_set_drvdata(pdev, dev);
91
92 dev->clk = clk_get(&pdev->dev, NULL);
93 dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
94
95 if (IS_ERR(dev->clk)) {
96 r = -ENODEV;
97 goto err_free_mem;
98 }
99 clk_prepare_enable(dev->clk);
100
101 dev->functionality =
102 I2C_FUNC_I2C |
103 I2C_FUNC_10BIT_ADDR |
104 I2C_FUNC_SMBUS_BYTE |
105 I2C_FUNC_SMBUS_BYTE_DATA |
106 I2C_FUNC_SMBUS_WORD_DATA |
107 I2C_FUNC_SMBUS_I2C_BLOCK;
108 dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
109 DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST;
110
111 dev->base = ioremap(mem->start, resource_size(mem));
112 if (dev->base == NULL) {
113 dev_err(&pdev->dev, "failure mapping io resources\n");
114 r = -EBUSY;
115 goto err_unuse_clocks;
116 }
117 {
118 u32 param1 = i2c_dw_read_comp_param(dev);
119
120 dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;
121 dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1;
122 }
123 r = i2c_dw_init(dev);
124 if (r)
125 goto err_iounmap;
126
127 i2c_dw_disable_int(dev);
128 r = request_irq(dev->irq, i2c_dw_isr, IRQF_DISABLED, pdev->name, dev);
129 if (r) {
130 dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
131 goto err_iounmap;
132 }
133
134 adap = &dev->adapter;
135 i2c_set_adapdata(adap, dev);
136 adap->owner = THIS_MODULE;
137 adap->class = I2C_CLASS_HWMON;
138 strlcpy(adap->name, "Synopsys DesignWare I2C adapter",
139 sizeof(adap->name));
140 adap->algo = &i2c_dw_algo;
141 adap->dev.parent = &pdev->dev;
142 adap->dev.of_node = pdev->dev.of_node;
143
144 adap->nr = pdev->id;
145 r = i2c_add_numbered_adapter(adap);
146 if (r) {
147 dev_err(&pdev->dev, "failure adding adapter\n");
148 goto err_free_irq;
149 }
150 of_i2c_register_devices(adap);
151
152 return 0;
153
154err_free_irq:
155 free_irq(dev->irq, dev);
156err_iounmap:
157 iounmap(dev->base);
158err_unuse_clocks:
159 clk_disable_unprepare(dev->clk);
160 clk_put(dev->clk);
161 dev->clk = NULL;
162err_free_mem:
163 platform_set_drvdata(pdev, NULL);
164 put_device(&pdev->dev);
165 kfree(dev);
166err_release_region:
167 release_mem_region(mem->start, resource_size(mem));
168
169 return r;
170}
171
172static int __devexit dw_i2c_remove(struct platform_device *pdev)
173{
174 struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
175 struct resource *mem;
176
177 platform_set_drvdata(pdev, NULL);
178 i2c_del_adapter(&dev->adapter);
179 put_device(&pdev->dev);
180
181 clk_disable_unprepare(dev->clk);
182 clk_put(dev->clk);
183 dev->clk = NULL;
184
185 i2c_dw_disable(dev);
186 free_irq(dev->irq, dev);
187 kfree(dev);
188
189 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
190 release_mem_region(mem->start, resource_size(mem));
191 return 0;
192}
193
194#ifdef CONFIG_OF
195static const struct of_device_id dw_i2c_of_match[] = {
196 { .compatible = "snps,designware-i2c", },
197 {},
198};
199MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
200#endif
201
202#ifdef CONFIG_PM
203static int dw_i2c_suspend(struct device *dev)
204{
205 struct platform_device *pdev = to_platform_device(dev);
206 struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
207
208 clk_disable_unprepare(i_dev->clk);
209
210 return 0;
211}
212
213static int dw_i2c_resume(struct device *dev)
214{
215 struct platform_device *pdev = to_platform_device(dev);
216 struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
217
218 clk_prepare_enable(i_dev->clk);
219 i2c_dw_init(i_dev);
220
221 return 0;
222}
223#endif
224
225static SIMPLE_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend, dw_i2c_resume);
226
227/* work with hotplug and coldplug */
228MODULE_ALIAS("platform:i2c_designware");
229
230static struct platform_driver dw_i2c_driver = {
231 .remove = __devexit_p(dw_i2c_remove),
232 .driver = {
233 .name = "i2c_designware",
234 .owner = THIS_MODULE,
235 .of_match_table = of_match_ptr(dw_i2c_of_match),
236 .pm = &dw_i2c_dev_pm_ops,
237 },
238};
239
240static int __init dw_i2c_init_driver(void)
241{
242 return platform_driver_probe(&dw_i2c_driver, dw_i2c_probe);
243}
244subsys_initcall(dw_i2c_init_driver);
245
246static void __exit dw_i2c_exit_driver(void)
247{
248 platform_driver_unregister(&dw_i2c_driver);
249}
250module_exit(dw_i2c_exit_driver);
251
252MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
253MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter");
254MODULE_LICENSE("GPL");