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