This source file includes following definitions.
- mfld_setup
- mrfld_setup
- i2c_dw_pci_suspend
- i2c_dw_pci_resume
- i2c_dw_get_clk_rate_khz
- i2c_dw_pci_probe
- i2c_dw_pci_remove
1
2
3
4
5
6
7
8
9
10
11
12 #include <linux/acpi.h>
13 #include <linux/delay.h>
14 #include <linux/err.h>
15 #include <linux/errno.h>
16 #include <linux/i2c.h>
17 #include <linux/interrupt.h>
18 #include <linux/io.h>
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/pci.h>
22 #include <linux/pm_runtime.h>
23 #include <linux/sched.h>
24 #include <linux/slab.h>
25
26 #include "i2c-designware-core.h"
27
28 #define DRIVER_NAME "i2c-designware-pci"
29
30 enum dw_pci_ctl_id_t {
31 medfield,
32 merrifield,
33 baytrail,
34 cherrytrail,
35 haswell,
36 elkhartlake,
37 };
38
39 struct dw_scl_sda_cfg {
40 u32 ss_hcnt;
41 u32 fs_hcnt;
42 u32 ss_lcnt;
43 u32 fs_lcnt;
44 u32 sda_hold;
45 };
46
47 struct dw_pci_controller {
48 u32 bus_num;
49 u32 bus_cfg;
50 u32 tx_fifo_depth;
51 u32 rx_fifo_depth;
52 u32 clk_khz;
53 u32 functionality;
54 u32 flags;
55 struct dw_scl_sda_cfg *scl_sda_cfg;
56 int (*setup)(struct pci_dev *pdev, struct dw_pci_controller *c);
57 };
58
59 #define INTEL_MID_STD_CFG (DW_IC_CON_MASTER | \
60 DW_IC_CON_SLAVE_DISABLE | \
61 DW_IC_CON_RESTART_EN)
62
63
64 static struct dw_scl_sda_cfg mrfld_config = {
65 .ss_hcnt = 0x2f8,
66 .fs_hcnt = 0x87,
67 .ss_lcnt = 0x37b,
68 .fs_lcnt = 0x10a,
69 };
70
71
72 static struct dw_scl_sda_cfg byt_config = {
73 .ss_hcnt = 0x200,
74 .fs_hcnt = 0x55,
75 .ss_lcnt = 0x200,
76 .fs_lcnt = 0x99,
77 .sda_hold = 0x6,
78 };
79
80
81 static struct dw_scl_sda_cfg hsw_config = {
82 .ss_hcnt = 0x01b0,
83 .fs_hcnt = 0x48,
84 .ss_lcnt = 0x01fb,
85 .fs_lcnt = 0xa0,
86 .sda_hold = 0x9,
87 };
88
89 static int mfld_setup(struct pci_dev *pdev, struct dw_pci_controller *c)
90 {
91 switch (pdev->device) {
92 case 0x0817:
93 c->bus_cfg &= ~DW_IC_CON_SPEED_MASK;
94 c->bus_cfg |= DW_IC_CON_SPEED_STD;
95
96 case 0x0818:
97 case 0x0819:
98 c->bus_num = pdev->device - 0x817 + 3;
99 return 0;
100 case 0x082C:
101 case 0x082D:
102 case 0x082E:
103 c->bus_num = pdev->device - 0x82C + 0;
104 return 0;
105 }
106 return -ENODEV;
107 }
108
109 static int mrfld_setup(struct pci_dev *pdev, struct dw_pci_controller *c)
110 {
111
112
113
114
115
116
117 switch (PCI_SLOT(pdev->devfn)) {
118 case 8:
119 c->bus_num = PCI_FUNC(pdev->devfn) + 0 + 1;
120 return 0;
121 case 9:
122 c->bus_num = PCI_FUNC(pdev->devfn) + 4 + 1;
123 return 0;
124 }
125 return -ENODEV;
126 }
127
128 static struct dw_pci_controller dw_pci_controllers[] = {
129 [medfield] = {
130 .bus_num = -1,
131 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
132 .tx_fifo_depth = 32,
133 .rx_fifo_depth = 32,
134 .functionality = I2C_FUNC_10BIT_ADDR,
135 .clk_khz = 25000,
136 .setup = mfld_setup,
137 },
138 [merrifield] = {
139 .bus_num = -1,
140 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
141 .tx_fifo_depth = 64,
142 .rx_fifo_depth = 64,
143 .functionality = I2C_FUNC_10BIT_ADDR,
144 .scl_sda_cfg = &mrfld_config,
145 .setup = mrfld_setup,
146 },
147 [baytrail] = {
148 .bus_num = -1,
149 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
150 .tx_fifo_depth = 32,
151 .rx_fifo_depth = 32,
152 .functionality = I2C_FUNC_10BIT_ADDR,
153 .scl_sda_cfg = &byt_config,
154 },
155 [haswell] = {
156 .bus_num = -1,
157 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
158 .tx_fifo_depth = 32,
159 .rx_fifo_depth = 32,
160 .functionality = I2C_FUNC_10BIT_ADDR,
161 .scl_sda_cfg = &hsw_config,
162 },
163 [cherrytrail] = {
164 .bus_num = -1,
165 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
166 .tx_fifo_depth = 32,
167 .rx_fifo_depth = 32,
168 .functionality = I2C_FUNC_10BIT_ADDR,
169 .flags = MODEL_CHERRYTRAIL,
170 .scl_sda_cfg = &byt_config,
171 },
172 [elkhartlake] = {
173 .bus_num = -1,
174 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
175 .tx_fifo_depth = 32,
176 .rx_fifo_depth = 32,
177 .functionality = I2C_FUNC_10BIT_ADDR,
178 .clk_khz = 100000,
179 },
180 };
181
182 #ifdef CONFIG_PM
183 static int i2c_dw_pci_suspend(struct device *dev)
184 {
185 struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
186
187 i_dev->suspended = true;
188 i_dev->disable(i_dev);
189
190 return 0;
191 }
192
193 static int i2c_dw_pci_resume(struct device *dev)
194 {
195 struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
196 int ret;
197
198 ret = i_dev->init(i_dev);
199 i_dev->suspended = false;
200
201 return ret;
202 }
203 #endif
204
205 static UNIVERSAL_DEV_PM_OPS(i2c_dw_pm_ops, i2c_dw_pci_suspend,
206 i2c_dw_pci_resume, NULL);
207
208 static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
209 {
210 return dev->controller->clk_khz;
211 }
212
213 static int i2c_dw_pci_probe(struct pci_dev *pdev,
214 const struct pci_device_id *id)
215 {
216 struct dw_i2c_dev *dev;
217 struct i2c_adapter *adap;
218 int r;
219 struct dw_pci_controller *controller;
220 struct dw_scl_sda_cfg *cfg;
221
222 if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers)) {
223 dev_err(&pdev->dev, "%s: invalid driver data %ld\n", __func__,
224 id->driver_data);
225 return -EINVAL;
226 }
227
228 controller = &dw_pci_controllers[id->driver_data];
229
230 r = pcim_enable_device(pdev);
231 if (r) {
232 dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n",
233 r);
234 return r;
235 }
236
237 pci_set_master(pdev);
238
239 r = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
240 if (r) {
241 dev_err(&pdev->dev, "I/O memory remapping failed\n");
242 return r;
243 }
244
245 dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
246 if (!dev)
247 return -ENOMEM;
248
249 r = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
250 if (r < 0)
251 return r;
252
253 dev->clk = NULL;
254 dev->controller = controller;
255 dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
256 dev->base = pcim_iomap_table(pdev)[0];
257 dev->dev = &pdev->dev;
258 dev->irq = pci_irq_vector(pdev, 0);
259 dev->flags |= controller->flags;
260
261 if (controller->setup) {
262 r = controller->setup(pdev, controller);
263 if (r) {
264 pci_free_irq_vectors(pdev);
265 return r;
266 }
267 }
268
269 dev->functionality = controller->functionality |
270 DW_IC_DEFAULT_FUNCTIONALITY;
271
272 dev->master_cfg = controller->bus_cfg;
273 if (controller->scl_sda_cfg) {
274 cfg = controller->scl_sda_cfg;
275 dev->ss_hcnt = cfg->ss_hcnt;
276 dev->fs_hcnt = cfg->fs_hcnt;
277 dev->ss_lcnt = cfg->ss_lcnt;
278 dev->fs_lcnt = cfg->fs_lcnt;
279 dev->sda_hold_time = cfg->sda_hold;
280 }
281
282 pci_set_drvdata(pdev, dev);
283
284 dev->tx_fifo_depth = controller->tx_fifo_depth;
285 dev->rx_fifo_depth = controller->rx_fifo_depth;
286
287 adap = &dev->adapter;
288 adap->owner = THIS_MODULE;
289 adap->class = 0;
290 ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
291 adap->nr = controller->bus_num;
292
293 r = i2c_dw_probe(dev);
294 if (r) {
295 pci_free_irq_vectors(pdev);
296 return r;
297 }
298
299 pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
300 pm_runtime_use_autosuspend(&pdev->dev);
301 pm_runtime_put_autosuspend(&pdev->dev);
302 pm_runtime_allow(&pdev->dev);
303
304 return 0;
305 }
306
307 static void i2c_dw_pci_remove(struct pci_dev *pdev)
308 {
309 struct dw_i2c_dev *dev = pci_get_drvdata(pdev);
310
311 dev->disable(dev);
312 pm_runtime_forbid(&pdev->dev);
313 pm_runtime_get_noresume(&pdev->dev);
314
315 i2c_del_adapter(&dev->adapter);
316 devm_free_irq(&pdev->dev, dev->irq, dev);
317 pci_free_irq_vectors(pdev);
318 }
319
320
321 MODULE_ALIAS("i2c_designware-pci");
322
323 static const struct pci_device_id i2_designware_pci_ids[] = {
324
325 { PCI_VDEVICE(INTEL, 0x0817), medfield },
326 { PCI_VDEVICE(INTEL, 0x0818), medfield },
327 { PCI_VDEVICE(INTEL, 0x0819), medfield },
328 { PCI_VDEVICE(INTEL, 0x082C), medfield },
329 { PCI_VDEVICE(INTEL, 0x082D), medfield },
330 { PCI_VDEVICE(INTEL, 0x082E), medfield },
331
332 { PCI_VDEVICE(INTEL, 0x1195), merrifield },
333 { PCI_VDEVICE(INTEL, 0x1196), merrifield },
334
335 { PCI_VDEVICE(INTEL, 0x0F41), baytrail },
336 { PCI_VDEVICE(INTEL, 0x0F42), baytrail },
337 { PCI_VDEVICE(INTEL, 0x0F43), baytrail },
338 { PCI_VDEVICE(INTEL, 0x0F44), baytrail },
339 { PCI_VDEVICE(INTEL, 0x0F45), baytrail },
340 { PCI_VDEVICE(INTEL, 0x0F46), baytrail },
341 { PCI_VDEVICE(INTEL, 0x0F47), baytrail },
342
343 { PCI_VDEVICE(INTEL, 0x9c61), haswell },
344 { PCI_VDEVICE(INTEL, 0x9c62), haswell },
345
346 { PCI_VDEVICE(INTEL, 0x22C1), cherrytrail },
347 { PCI_VDEVICE(INTEL, 0x22C2), cherrytrail },
348 { PCI_VDEVICE(INTEL, 0x22C3), cherrytrail },
349 { PCI_VDEVICE(INTEL, 0x22C4), cherrytrail },
350 { PCI_VDEVICE(INTEL, 0x22C5), cherrytrail },
351 { PCI_VDEVICE(INTEL, 0x22C6), cherrytrail },
352 { PCI_VDEVICE(INTEL, 0x22C7), cherrytrail },
353
354 { PCI_VDEVICE(INTEL, 0x4bb9), elkhartlake },
355 { PCI_VDEVICE(INTEL, 0x4bba), elkhartlake },
356 { PCI_VDEVICE(INTEL, 0x4bbb), elkhartlake },
357 { PCI_VDEVICE(INTEL, 0x4bbc), elkhartlake },
358 { PCI_VDEVICE(INTEL, 0x4bbd), elkhartlake },
359 { PCI_VDEVICE(INTEL, 0x4bbe), elkhartlake },
360 { PCI_VDEVICE(INTEL, 0x4bbf), elkhartlake },
361 { PCI_VDEVICE(INTEL, 0x4bc0), elkhartlake },
362 { 0,}
363 };
364 MODULE_DEVICE_TABLE(pci, i2_designware_pci_ids);
365
366 static struct pci_driver dw_i2c_driver = {
367 .name = DRIVER_NAME,
368 .id_table = i2_designware_pci_ids,
369 .probe = i2c_dw_pci_probe,
370 .remove = i2c_dw_pci_remove,
371 .driver = {
372 .pm = &i2c_dw_pm_ops,
373 },
374 };
375
376 module_pci_driver(dw_i2c_driver);
377
378 MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
379 MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter");
380 MODULE_LICENSE("GPL");