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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
111 id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
112 if (id && id->driver_data)
113 dev->accessor_flags |= (u32)id->driver_data;
114
115 return 0;
116}
117
118static const struct acpi_device_id dw_i2c_acpi_match[] = {
119 { "INT33C2", 0 },
120 { "INT33C3", 0 },
121 { "INT3432", 0 },
122 { "INT3433", 0 },
123 { "80860F41", 0 },
124 { "808622C1", 0 },
125 { "AMD0010", ACCESS_INTR_MASK },
126 { "AMDI0010", ACCESS_INTR_MASK },
127 { "AMDI0510", 0 },
128 { "APMC0D0F", 0 },
129 { }
130};
131MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match);
132#else
133static inline int dw_i2c_acpi_configure(struct platform_device *pdev)
134{
135 return -ENODEV;
136}
137#endif
138
139static int i2c_dw_plat_prepare_clk(struct dw_i2c_dev *i_dev, bool prepare)
140{
141 if (IS_ERR(i_dev->clk))
142 return PTR_ERR(i_dev->clk);
143
144 if (prepare)
145 return clk_prepare_enable(i_dev->clk);
146
147 clk_disable_unprepare(i_dev->clk);
148 return 0;
149}
150
151static int dw_i2c_plat_probe(struct platform_device *pdev)
152{
153 struct dw_i2c_platform_data *pdata = dev_get_platdata(&pdev->dev);
154 struct dw_i2c_dev *dev;
155 struct i2c_adapter *adap;
156 struct resource *mem;
157 int irq, r;
158 u32 clk_freq, ht = 0;
159
160 irq = platform_get_irq(pdev, 0);
161 if (irq < 0)
162 return irq;
163
164 dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
165 if (!dev)
166 return -ENOMEM;
167
168 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
169 dev->base = devm_ioremap_resource(&pdev->dev, mem);
170 if (IS_ERR(dev->base))
171 return PTR_ERR(dev->base);
172
173 dev->dev = &pdev->dev;
174 dev->irq = irq;
175 platform_set_drvdata(pdev, dev);
176
177
178 clk_freq = 400000;
179
180 if (pdata) {
181 clk_freq = pdata->i2c_scl_freq;
182 } else {
183 device_property_read_u32(&pdev->dev, "i2c-sda-hold-time-ns",
184 &ht);
185 device_property_read_u32(&pdev->dev, "i2c-sda-falling-time-ns",
186 &dev->sda_falling_time);
187 device_property_read_u32(&pdev->dev, "i2c-scl-falling-time-ns",
188 &dev->scl_falling_time);
189 device_property_read_u32(&pdev->dev, "clock-frequency",
190 &clk_freq);
191 }
192
193 if (has_acpi_companion(&pdev->dev))
194 dw_i2c_acpi_configure(pdev);
195
196
197
198
199 if (clk_freq != 100000 && clk_freq != 400000) {
200 dev_err(&pdev->dev, "Only 100kHz and 400kHz supported");
201 return -EINVAL;
202 }
203
204 r = i2c_dw_eval_lock_support(dev);
205 if (r)
206 return r;
207
208 dev->functionality =
209 I2C_FUNC_I2C |
210 I2C_FUNC_10BIT_ADDR |
211 I2C_FUNC_SMBUS_BYTE |
212 I2C_FUNC_SMBUS_BYTE_DATA |
213 I2C_FUNC_SMBUS_WORD_DATA |
214 I2C_FUNC_SMBUS_I2C_BLOCK;
215 if (clk_freq == 100000)
216 dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
217 DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_STD;
218 else
219 dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
220 DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST;
221
222 dev->clk = devm_clk_get(&pdev->dev, NULL);
223 if (!i2c_dw_plat_prepare_clk(dev, true)) {
224 dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
225
226 if (!dev->sda_hold_time && ht)
227 dev->sda_hold_time = div_u64(
228 (u64)dev->get_clk_rate_khz(dev) * ht + 500000,
229 1000000);
230 }
231
232 if (!dev->tx_fifo_depth) {
233 u32 param1 = i2c_dw_read_comp_param(dev);
234
235 dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;
236 dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1;
237 dev->adapter.nr = pdev->id;
238 }
239
240 adap = &dev->adapter;
241 adap->owner = THIS_MODULE;
242 adap->class = I2C_CLASS_DEPRECATED;
243 ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
244 adap->dev.of_node = pdev->dev.of_node;
245
246 if (dev->pm_runtime_disabled) {
247 pm_runtime_forbid(&pdev->dev);
248 } else {
249 pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
250 pm_runtime_use_autosuspend(&pdev->dev);
251 pm_runtime_set_active(&pdev->dev);
252 pm_runtime_enable(&pdev->dev);
253 }
254
255 r = i2c_dw_probe(dev);
256 if (r && !dev->pm_runtime_disabled)
257 pm_runtime_disable(&pdev->dev);
258
259 return r;
260}
261
262static int dw_i2c_plat_remove(struct platform_device *pdev)
263{
264 struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
265
266 pm_runtime_get_sync(&pdev->dev);
267
268 i2c_del_adapter(&dev->adapter);
269
270 i2c_dw_disable(dev);
271
272 pm_runtime_dont_use_autosuspend(&pdev->dev);
273 pm_runtime_put_sync(&pdev->dev);
274 if (!dev->pm_runtime_disabled)
275 pm_runtime_disable(&pdev->dev);
276
277 return 0;
278}
279
280#ifdef CONFIG_OF
281static const struct of_device_id dw_i2c_of_match[] = {
282 { .compatible = "snps,designware-i2c", },
283 {},
284};
285MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
286#endif
287
288#ifdef CONFIG_PM_SLEEP
289static int dw_i2c_plat_prepare(struct device *dev)
290{
291 return pm_runtime_suspended(dev);
292}
293
294static void dw_i2c_plat_complete(struct device *dev)
295{
296 if (dev->power.direct_complete)
297 pm_request_resume(dev);
298}
299#else
300#define dw_i2c_plat_prepare NULL
301#define dw_i2c_plat_complete NULL
302#endif
303
304#ifdef CONFIG_PM
305static int dw_i2c_plat_suspend(struct device *dev)
306{
307 struct platform_device *pdev = to_platform_device(dev);
308 struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
309
310 i2c_dw_disable(i_dev);
311 i2c_dw_plat_prepare_clk(i_dev, false);
312
313 return 0;
314}
315
316static int dw_i2c_plat_resume(struct device *dev)
317{
318 struct platform_device *pdev = to_platform_device(dev);
319 struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
320
321 i2c_dw_plat_prepare_clk(i_dev, true);
322
323 if (!i_dev->pm_runtime_disabled)
324 i2c_dw_init(i_dev);
325
326 return 0;
327}
328
329static const struct dev_pm_ops dw_i2c_dev_pm_ops = {
330 .prepare = dw_i2c_plat_prepare,
331 .complete = dw_i2c_plat_complete,
332 SET_SYSTEM_SLEEP_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume)
333 SET_RUNTIME_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume, NULL)
334};
335
336#define DW_I2C_DEV_PMOPS (&dw_i2c_dev_pm_ops)
337#else
338#define DW_I2C_DEV_PMOPS NULL
339#endif
340
341
342MODULE_ALIAS("platform:i2c_designware");
343
344static struct platform_driver dw_i2c_driver = {
345 .probe = dw_i2c_plat_probe,
346 .remove = dw_i2c_plat_remove,
347 .driver = {
348 .name = "i2c_designware",
349 .of_match_table = of_match_ptr(dw_i2c_of_match),
350 .acpi_match_table = ACPI_PTR(dw_i2c_acpi_match),
351 .pm = DW_I2C_DEV_PMOPS,
352 },
353};
354
355static int __init dw_i2c_init_driver(void)
356{
357 return platform_driver_register(&dw_i2c_driver);
358}
359subsys_initcall(dw_i2c_init_driver);
360
361static void __exit dw_i2c_exit_driver(void)
362{
363 platform_driver_unregister(&dw_i2c_driver);
364}
365module_exit(dw_i2c_exit_driver);
366
367MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
368MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter");
369MODULE_LICENSE("GPL");
370
