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24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/delay.h>
27#include <linux/dmi.h>
28#include <linux/i2c.h>
29#include <linux/clk.h>
30#include <linux/clk-provider.h>
31#include <linux/errno.h>
32#include <linux/sched.h>
33#include <linux/err.h>
34#include <linux/interrupt.h>
35#include <linux/of.h>
36#include <linux/platform_device.h>
37#include <linux/pm.h>
38#include <linux/pm_runtime.h>
39#include <linux/property.h>
40#include <linux/io.h>
41#include <linux/slab.h>
42#include <linux/acpi.h>
43#include <linux/platform_data/i2c-designware.h>
44#include "i2c-designware-core.h"
45
46static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
47{
48 return clk_get_rate(dev->clk)/1000;
49}
50
51#ifdef CONFIG_ACPI
52
53
54
55
56
57static const struct dmi_system_id dw_i2c_no_acpi_params[] = {
58 {
59 .ident = "Dell Inspiron 7348",
60 .matches = {
61 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
62 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7348"),
63 },
64 },
65 { }
66};
67
68static void dw_i2c_acpi_params(struct platform_device *pdev, char method[],
69 u16 *hcnt, u16 *lcnt, u32 *sda_hold)
70{
71 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
72 acpi_handle handle = ACPI_HANDLE(&pdev->dev);
73 union acpi_object *obj;
74
75 if (dmi_check_system(dw_i2c_no_acpi_params))
76 return;
77
78 if (ACPI_FAILURE(acpi_evaluate_object(handle, method, NULL, &buf)))
79 return;
80
81 obj = (union acpi_object *)buf.pointer;
82 if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 3) {
83 const union acpi_object *objs = obj->package.elements;
84
85 *hcnt = (u16)objs[0].integer.value;
86 *lcnt = (u16)objs[1].integer.value;
87 if (sda_hold)
88 *sda_hold = (u32)objs[2].integer.value;
89 }
90
91 kfree(buf.pointer);
92}
93
94static int dw_i2c_acpi_configure(struct platform_device *pdev)
95{
96 struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
97 const struct acpi_device_id *id;
98
99 dev->adapter.nr = -1;
100 dev->tx_fifo_depth = 32;
101 dev->rx_fifo_depth = 32;
102
103
104
105
106
107 dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt, NULL);
108 dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt,
109 &dev->sda_hold_time);
110 dw_i2c_acpi_params(pdev, "FPCN", &dev->fp_hcnt, &dev->fp_lcnt, NULL);
111 dw_i2c_acpi_params(pdev, "HSCN", &dev->hs_hcnt, &dev->hs_lcnt, NULL);
112
113 id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
114 if (id && id->driver_data)
115 dev->accessor_flags |= (u32)id->driver_data;
116
117 return 0;
118}
119
120static const struct acpi_device_id dw_i2c_acpi_match[] = {
121 { "INT33C2", 0 },
122 { "INT33C3", 0 },
123 { "INT3432", 0 },
124 { "INT3433", 0 },
125 { "80860F41", 0 },
126 { "808622C1", 0 },
127 { "AMD0010", ACCESS_INTR_MASK },
128 { "AMDI0010", ACCESS_INTR_MASK },
129 { "AMDI0510", 0 },
130 { "APMC0D0F", 0 },
131 { }
132};
133MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match);
134#else
135static inline int dw_i2c_acpi_configure(struct platform_device *pdev)
136{
137 return -ENODEV;
138}
139#endif
140
141static int i2c_dw_plat_prepare_clk(struct dw_i2c_dev *i_dev, bool prepare)
142{
143 if (IS_ERR(i_dev->clk))
144 return PTR_ERR(i_dev->clk);
145
146 if (prepare)
147 return clk_prepare_enable(i_dev->clk);
148
149 clk_disable_unprepare(i_dev->clk);
150 return 0;
151}
152
153static int dw_i2c_plat_probe(struct platform_device *pdev)
154{
155 struct dw_i2c_platform_data *pdata = dev_get_platdata(&pdev->dev);
156 struct dw_i2c_dev *dev;
157 struct i2c_adapter *adap;
158 struct resource *mem;
159 int irq, r;
160 u32 acpi_speed, ht = 0;
161
162 irq = platform_get_irq(pdev, 0);
163 if (irq < 0)
164 return irq;
165
166 dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
167 if (!dev)
168 return -ENOMEM;
169
170 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
171 dev->base = devm_ioremap_resource(&pdev->dev, mem);
172 if (IS_ERR(dev->base))
173 return PTR_ERR(dev->base);
174
175 dev->dev = &pdev->dev;
176 dev->irq = irq;
177 platform_set_drvdata(pdev, dev);
178
179
180 dev->clk_freq = 400000;
181
182 if (pdata) {
183 dev->clk_freq = pdata->i2c_scl_freq;
184 } else {
185 device_property_read_u32(&pdev->dev, "i2c-sda-hold-time-ns",
186 &ht);
187 device_property_read_u32(&pdev->dev, "i2c-sda-falling-time-ns",
188 &dev->sda_falling_time);
189 device_property_read_u32(&pdev->dev, "i2c-scl-falling-time-ns",
190 &dev->scl_falling_time);
191 device_property_read_u32(&pdev->dev, "clock-frequency",
192 &dev->clk_freq);
193 }
194
195 acpi_speed = i2c_acpi_find_bus_speed(&pdev->dev);
196 if (acpi_speed)
197 dev->clk_freq = acpi_speed;
198
199 if (has_acpi_companion(&pdev->dev))
200 dw_i2c_acpi_configure(pdev);
201
202
203
204
205
206 if (dev->clk_freq != 100000 && dev->clk_freq != 400000
207 && dev->clk_freq != 1000000 && dev->clk_freq != 3400000) {
208 dev_err(&pdev->dev,
209 "Only 100kHz, 400kHz, 1MHz and 3.4MHz supported");
210 return -EINVAL;
211 }
212
213 r = i2c_dw_eval_lock_support(dev);
214 if (r)
215 return r;
216
217 dev->functionality =
218 I2C_FUNC_I2C |
219 I2C_FUNC_10BIT_ADDR |
220 I2C_FUNC_SMBUS_BYTE |
221 I2C_FUNC_SMBUS_BYTE_DATA |
222 I2C_FUNC_SMBUS_WORD_DATA |
223 I2C_FUNC_SMBUS_I2C_BLOCK;
224
225 dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
226 DW_IC_CON_RESTART_EN;
227
228 switch (dev->clk_freq) {
229 case 100000:
230 dev->master_cfg |= DW_IC_CON_SPEED_STD;
231 break;
232 case 3400000:
233 dev->master_cfg |= DW_IC_CON_SPEED_HIGH;
234 break;
235 default:
236 dev->master_cfg |= DW_IC_CON_SPEED_FAST;
237 }
238
239 dev->clk = devm_clk_get(&pdev->dev, NULL);
240 if (!i2c_dw_plat_prepare_clk(dev, true)) {
241 dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
242
243 if (!dev->sda_hold_time && ht)
244 dev->sda_hold_time = div_u64(
245 (u64)dev->get_clk_rate_khz(dev) * ht + 500000,
246 1000000);
247 }
248
249 if (!dev->tx_fifo_depth) {
250 u32 param1 = i2c_dw_read_comp_param(dev);
251
252 dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;
253 dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1;
254 dev->adapter.nr = pdev->id;
255 }
256
257 adap = &dev->adapter;
258 adap->owner = THIS_MODULE;
259 adap->class = I2C_CLASS_DEPRECATED;
260 ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
261 adap->dev.of_node = pdev->dev.of_node;
262
263 if (dev->pm_runtime_disabled) {
264 pm_runtime_forbid(&pdev->dev);
265 } else {
266 pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
267 pm_runtime_use_autosuspend(&pdev->dev);
268 pm_runtime_set_active(&pdev->dev);
269 pm_runtime_enable(&pdev->dev);
270 }
271
272 r = i2c_dw_probe(dev);
273 if (r && !dev->pm_runtime_disabled)
274 pm_runtime_disable(&pdev->dev);
275
276 return r;
277}
278
279static int dw_i2c_plat_remove(struct platform_device *pdev)
280{
281 struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
282
283 pm_runtime_get_sync(&pdev->dev);
284
285 i2c_del_adapter(&dev->adapter);
286
287 i2c_dw_disable(dev);
288
289 pm_runtime_dont_use_autosuspend(&pdev->dev);
290 pm_runtime_put_sync(&pdev->dev);
291 if (!dev->pm_runtime_disabled)
292 pm_runtime_disable(&pdev->dev);
293
294 return 0;
295}
296
297#ifdef CONFIG_OF
298static const struct of_device_id dw_i2c_of_match[] = {
299 { .compatible = "snps,designware-i2c", },
300 {},
301};
302MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
303#endif
304
305#ifdef CONFIG_PM_SLEEP
306static int dw_i2c_plat_prepare(struct device *dev)
307{
308 return pm_runtime_suspended(dev);
309}
310
311static void dw_i2c_plat_complete(struct device *dev)
312{
313 if (dev->power.direct_complete)
314 pm_request_resume(dev);
315}
316#else
317#define dw_i2c_plat_prepare NULL
318#define dw_i2c_plat_complete NULL
319#endif
320
321#ifdef CONFIG_PM
322static int dw_i2c_plat_suspend(struct device *dev)
323{
324 struct platform_device *pdev = to_platform_device(dev);
325 struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
326
327 i2c_dw_disable(i_dev);
328 i2c_dw_plat_prepare_clk(i_dev, false);
329
330 return 0;
331}
332
333static int dw_i2c_plat_resume(struct device *dev)
334{
335 struct platform_device *pdev = to_platform_device(dev);
336 struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
337
338 i2c_dw_plat_prepare_clk(i_dev, true);
339
340 if (!i_dev->pm_runtime_disabled)
341 i2c_dw_init(i_dev);
342
343 return 0;
344}
345
346static const struct dev_pm_ops dw_i2c_dev_pm_ops = {
347 .prepare = dw_i2c_plat_prepare,
348 .complete = dw_i2c_plat_complete,
349 SET_SYSTEM_SLEEP_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume)
350 SET_RUNTIME_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume, NULL)
351};
352
353#define DW_I2C_DEV_PMOPS (&dw_i2c_dev_pm_ops)
354#else
355#define DW_I2C_DEV_PMOPS NULL
356#endif
357
358
359MODULE_ALIAS("platform:i2c_designware");
360
361static struct platform_driver dw_i2c_driver = {
362 .probe = dw_i2c_plat_probe,
363 .remove = dw_i2c_plat_remove,
364 .driver = {
365 .name = "i2c_designware",
366 .of_match_table = of_match_ptr(dw_i2c_of_match),
367 .acpi_match_table = ACPI_PTR(dw_i2c_acpi_match),
368 .pm = DW_I2C_DEV_PMOPS,
369 },
370};
371
372static int __init dw_i2c_init_driver(void)
373{
374 return platform_driver_register(&dw_i2c_driver);
375}
376subsys_initcall(dw_i2c_init_driver);
377
378static void __exit dw_i2c_exit_driver(void)
379{
380 platform_driver_unregister(&dw_i2c_driver);
381}
382module_exit(dw_i2c_exit_driver);
383
384MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
385MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter");
386MODULE_LICENSE("GPL");
387
