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24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/delay.h>
27#include <linux/i2c.h>
28#include <linux/clk.h>
29#include <linux/clk-provider.h>
30#include <linux/errno.h>
31#include <linux/sched.h>
32#include <linux/err.h>
33#include <linux/interrupt.h>
34#include <linux/of.h>
35#include <linux/platform_device.h>
36#include <linux/pm.h>
37#include <linux/pm_runtime.h>
38#include <linux/io.h>
39#include <linux/slab.h>
40#include <linux/acpi.h>
41#include <linux/platform_data/i2c-designware.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
53#ifdef CONFIG_ACPI
54static void dw_i2c_acpi_params(struct platform_device *pdev, char method[],
55 u16 *hcnt, u16 *lcnt, u32 *sda_hold)
56{
57 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
58 acpi_handle handle = ACPI_HANDLE(&pdev->dev);
59 union acpi_object *obj;
60
61 if (ACPI_FAILURE(acpi_evaluate_object(handle, method, NULL, &buf)))
62 return;
63
64 obj = (union acpi_object *)buf.pointer;
65 if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 3) {
66 const union acpi_object *objs = obj->package.elements;
67
68 *hcnt = (u16)objs[0].integer.value;
69 *lcnt = (u16)objs[1].integer.value;
70 if (sda_hold)
71 *sda_hold = (u32)objs[2].integer.value;
72 }
73
74 kfree(buf.pointer);
75}
76
77static int dw_i2c_acpi_configure(struct platform_device *pdev)
78{
79 struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
80 const struct acpi_device_id *id;
81
82 dev->adapter.nr = -1;
83 dev->tx_fifo_depth = 32;
84 dev->rx_fifo_depth = 32;
85
86
87
88
89
90 dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt, NULL);
91 dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt,
92 &dev->sda_hold_time);
93
94
95
96
97
98
99 id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
100 if (id && id->driver_data)
101 clk_register_fixed_rate(&pdev->dev, dev_name(&pdev->dev), NULL,
102 CLK_IS_ROOT, id->driver_data);
103
104 return 0;
105}
106
107static void dw_i2c_acpi_unconfigure(struct platform_device *pdev)
108{
109 struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
110 const struct acpi_device_id *id;
111
112 id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
113 if (id && id->driver_data)
114 clk_unregister(dev->clk);
115}
116
117static const struct acpi_device_id dw_i2c_acpi_match[] = {
118 { "INT33C2", 0 },
119 { "INT33C3", 0 },
120 { "INT3432", 0 },
121 { "INT3433", 0 },
122 { "80860F41", 0 },
123 { "808622C1", 0 },
124 { "AMD0010", 133 * 1000 * 1000 },
125 { }
126};
127MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match);
128#else
129static inline int dw_i2c_acpi_configure(struct platform_device *pdev)
130{
131 return -ENODEV;
132}
133static inline void dw_i2c_acpi_unconfigure(struct platform_device *pdev) { }
134#endif
135
136static int dw_i2c_probe(struct platform_device *pdev)
137{
138 struct dw_i2c_dev *dev;
139 struct i2c_adapter *adap;
140 struct resource *mem;
141 struct dw_i2c_platform_data *pdata;
142 int irq, r;
143 u32 clk_freq, ht = 0;
144
145 irq = platform_get_irq(pdev, 0);
146 if (irq < 0) {
147 dev_err(&pdev->dev, "no irq resource?\n");
148 return irq;
149 }
150
151 dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
152 if (!dev)
153 return -ENOMEM;
154
155 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
156 dev->base = devm_ioremap_resource(&pdev->dev, mem);
157 if (IS_ERR(dev->base))
158 return PTR_ERR(dev->base);
159
160 init_completion(&dev->cmd_complete);
161 mutex_init(&dev->lock);
162 dev->dev = &pdev->dev;
163 dev->irq = irq;
164 platform_set_drvdata(pdev, dev);
165
166
167 clk_freq = 400000;
168
169 if (ACPI_COMPANION(&pdev->dev)) {
170 dw_i2c_acpi_configure(pdev);
171 } else if (pdev->dev.of_node) {
172 of_property_read_u32(pdev->dev.of_node,
173 "i2c-sda-hold-time-ns", &ht);
174
175 of_property_read_u32(pdev->dev.of_node,
176 "i2c-sda-falling-time-ns",
177 &dev->sda_falling_time);
178 of_property_read_u32(pdev->dev.of_node,
179 "i2c-scl-falling-time-ns",
180 &dev->scl_falling_time);
181
182 of_property_read_u32(pdev->dev.of_node, "clock-frequency",
183 &clk_freq);
184
185
186
187
188 if (clk_freq != 100000 && clk_freq != 400000) {
189 dev_err(&pdev->dev, "Only 100kHz and 400kHz supported");
190 return -EINVAL;
191 }
192 } else {
193 pdata = dev_get_platdata(&pdev->dev);
194 if (pdata)
195 clk_freq = pdata->i2c_scl_freq;
196 }
197
198 dev->functionality =
199 I2C_FUNC_I2C |
200 I2C_FUNC_10BIT_ADDR |
201 I2C_FUNC_SMBUS_BYTE |
202 I2C_FUNC_SMBUS_BYTE_DATA |
203 I2C_FUNC_SMBUS_WORD_DATA |
204 I2C_FUNC_SMBUS_I2C_BLOCK;
205 if (clk_freq == 100000)
206 dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
207 DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_STD;
208 else
209 dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
210 DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST;
211
212 dev->clk = devm_clk_get(&pdev->dev, NULL);
213 dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
214 if (IS_ERR(dev->clk))
215 return PTR_ERR(dev->clk);
216 clk_prepare_enable(dev->clk);
217
218 if (!dev->sda_hold_time && ht) {
219 u32 ic_clk = dev->get_clk_rate_khz(dev);
220
221 dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000,
222 1000000);
223 }
224
225 if (!dev->tx_fifo_depth) {
226 u32 param1 = i2c_dw_read_comp_param(dev);
227
228 dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;
229 dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1;
230 dev->adapter.nr = pdev->id;
231 }
232 r = i2c_dw_init(dev);
233 if (r)
234 return r;
235
236 i2c_dw_disable_int(dev);
237 r = devm_request_irq(&pdev->dev, dev->irq, i2c_dw_isr, IRQF_SHARED,
238 pdev->name, dev);
239 if (r) {
240 dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
241 return r;
242 }
243
244 adap = &dev->adapter;
245 i2c_set_adapdata(adap, dev);
246 adap->owner = THIS_MODULE;
247 adap->class = I2C_CLASS_DEPRECATED;
248 strlcpy(adap->name, "Synopsys DesignWare I2C adapter",
249 sizeof(adap->name));
250 adap->algo = &i2c_dw_algo;
251 adap->dev.parent = &pdev->dev;
252 adap->dev.of_node = pdev->dev.of_node;
253
254 r = i2c_add_numbered_adapter(adap);
255 if (r) {
256 dev_err(&pdev->dev, "failure adding adapter\n");
257 return r;
258 }
259
260 pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
261 pm_runtime_use_autosuspend(&pdev->dev);
262 pm_runtime_set_active(&pdev->dev);
263 pm_runtime_enable(&pdev->dev);
264
265 return 0;
266}
267
268static int dw_i2c_remove(struct platform_device *pdev)
269{
270 struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
271
272 pm_runtime_get_sync(&pdev->dev);
273
274 i2c_del_adapter(&dev->adapter);
275
276 i2c_dw_disable(dev);
277
278 pm_runtime_put(&pdev->dev);
279 pm_runtime_disable(&pdev->dev);
280
281 if (ACPI_COMPANION(&pdev->dev))
282 dw_i2c_acpi_unconfigure(pdev);
283
284 return 0;
285}
286
287#ifdef CONFIG_OF
288static const struct of_device_id dw_i2c_of_match[] = {
289 { .compatible = "snps,designware-i2c", },
290 {},
291};
292MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
293#endif
294
295#ifdef CONFIG_PM
296static int dw_i2c_suspend(struct device *dev)
297{
298 struct platform_device *pdev = to_platform_device(dev);
299 struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
300
301 i2c_dw_disable(i_dev);
302 clk_disable_unprepare(i_dev->clk);
303
304 return 0;
305}
306
307static int dw_i2c_resume(struct device *dev)
308{
309 struct platform_device *pdev = to_platform_device(dev);
310 struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
311
312 clk_prepare_enable(i_dev->clk);
313 i2c_dw_init(i_dev);
314
315 return 0;
316}
317#endif
318
319static UNIVERSAL_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend,
320 dw_i2c_resume, NULL);
321
322
323MODULE_ALIAS("platform:i2c_designware");
324
325static struct platform_driver dw_i2c_driver = {
326 .probe = dw_i2c_probe,
327 .remove = dw_i2c_remove,
328 .driver = {
329 .name = "i2c_designware",
330 .owner = THIS_MODULE,
331 .of_match_table = of_match_ptr(dw_i2c_of_match),
332 .acpi_match_table = ACPI_PTR(dw_i2c_acpi_match),
333 .pm = &dw_i2c_dev_pm_ops,
334 },
335};
336
337static int __init dw_i2c_init_driver(void)
338{
339 return platform_driver_register(&dw_i2c_driver);
340}
341subsys_initcall(dw_i2c_init_driver);
342
343static void __exit dw_i2c_exit_driver(void)
344{
345 platform_driver_unregister(&dw_i2c_driver);
346}
347module_exit(dw_i2c_exit_driver);
348
349MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
350MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter");
351MODULE_LICENSE("GPL");
352
