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Merge branch 'stable/for-linus-4.10' of git://git.kernel.org/pub/scm/linux/kernel...
[karo-tx-linux.git] / drivers / i2c / busses / i2c-designware-pcidrv.c
1 /*
2  * Synopsys DesignWare I2C adapter driver (master only).
3  *
4  * Based on the TI DAVINCI I2C adapter driver.
5  *
6  * Copyright (C) 2006 Texas Instruments.
7  * Copyright (C) 2007 MontaVista Software Inc.
8  * Copyright (C) 2009 Provigent Ltd.
9  * Copyright (C) 2011, 2015, 2016 Intel Corporation.
10  *
11  * ----------------------------------------------------------------------------
12  *
13  * This program is free software; you can redistribute it and/or modify
14  * it under the terms of the GNU General Public License as published by
15  * the Free Software Foundation; either version 2 of the License, or
16  * (at your option) any later version.
17  *
18  * This program is distributed in the hope that it will be useful,
19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21  * GNU General Public License for more details.
22  * ----------------------------------------------------------------------------
23  *
24  */
25
26 #include <linux/acpi.h>
27 #include <linux/delay.h>
28 #include <linux/err.h>
29 #include <linux/errno.h>
30 #include <linux/i2c.h>
31 #include <linux/interrupt.h>
32 #include <linux/io.h>
33 #include <linux/kernel.h>
34 #include <linux/module.h>
35 #include <linux/pci.h>
36 #include <linux/pm_runtime.h>
37 #include <linux/sched.h>
38 #include <linux/slab.h>
39
40 #include "i2c-designware-core.h"
41
42 #define DRIVER_NAME "i2c-designware-pci"
43
44 enum dw_pci_ctl_id_t {
45         medfield,
46         merrifield,
47         baytrail,
48         haswell,
49 };
50
51 struct dw_scl_sda_cfg {
52         u32 ss_hcnt;
53         u32 fs_hcnt;
54         u32 ss_lcnt;
55         u32 fs_lcnt;
56         u32 sda_hold;
57 };
58
59 struct dw_pci_controller {
60         u32 bus_num;
61         u32 bus_cfg;
62         u32 tx_fifo_depth;
63         u32 rx_fifo_depth;
64         u32 clk_khz;
65         u32 functionality;
66         struct dw_scl_sda_cfg *scl_sda_cfg;
67         int (*setup)(struct pci_dev *pdev, struct dw_pci_controller *c);
68 };
69
70 #define INTEL_MID_STD_CFG  (DW_IC_CON_MASTER |                  \
71                                 DW_IC_CON_SLAVE_DISABLE |       \
72                                 DW_IC_CON_RESTART_EN)
73
74 /* Merrifield HCNT/LCNT/SDA hold time */
75 static struct dw_scl_sda_cfg mrfld_config = {
76         .ss_hcnt = 0x2f8,
77         .fs_hcnt = 0x87,
78         .ss_lcnt = 0x37b,
79         .fs_lcnt = 0x10a,
80 };
81
82 /* BayTrail HCNT/LCNT/SDA hold time */
83 static struct dw_scl_sda_cfg byt_config = {
84         .ss_hcnt = 0x200,
85         .fs_hcnt = 0x55,
86         .ss_lcnt = 0x200,
87         .fs_lcnt = 0x99,
88         .sda_hold = 0x6,
89 };
90
91 /* Haswell HCNT/LCNT/SDA hold time */
92 static struct dw_scl_sda_cfg hsw_config = {
93         .ss_hcnt = 0x01b0,
94         .fs_hcnt = 0x48,
95         .ss_lcnt = 0x01fb,
96         .fs_lcnt = 0xa0,
97         .sda_hold = 0x9,
98 };
99
100 static int mfld_setup(struct pci_dev *pdev, struct dw_pci_controller *c)
101 {
102         switch (pdev->device) {
103         case 0x0817:
104                 c->bus_cfg &= ~DW_IC_CON_SPEED_MASK;
105                 c->bus_cfg |= DW_IC_CON_SPEED_STD;
106         case 0x0818:
107         case 0x0819:
108                 c->bus_num = pdev->device - 0x817 + 3;
109                 return 0;
110         case 0x082C:
111         case 0x082D:
112         case 0x082E:
113                 c->bus_num = pdev->device - 0x82C + 0;
114                 return 0;
115         }
116         return -ENODEV;
117 }
118
119 static int mrfld_setup(struct pci_dev *pdev, struct dw_pci_controller *c)
120 {
121         /*
122          * On Intel Merrifield the user visible i2c busses are enumerated
123          * [1..7]. So, we add 1 to shift the default range. Besides that the
124          * first PCI slot provides 4 functions, that's why we have to add 0 to
125          * the first slot and 4 to the next one.
126          */
127         switch (PCI_SLOT(pdev->devfn)) {
128         case 8:
129                 c->bus_num = PCI_FUNC(pdev->devfn) + 0 + 1;
130                 return 0;
131         case 9:
132                 c->bus_num = PCI_FUNC(pdev->devfn) + 4 + 1;
133                 return 0;
134         }
135         return -ENODEV;
136 }
137
138 static struct dw_pci_controller dw_pci_controllers[] = {
139         [medfield] = {
140                 .bus_num = -1,
141                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
142                 .tx_fifo_depth = 32,
143                 .rx_fifo_depth = 32,
144                 .functionality = I2C_FUNC_10BIT_ADDR,
145                 .clk_khz      = 25000,
146                 .setup = mfld_setup,
147         },
148         [merrifield] = {
149                 .bus_num = -1,
150                 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
151                 .tx_fifo_depth = 64,
152                 .rx_fifo_depth = 64,
153                 .functionality = I2C_FUNC_10BIT_ADDR,
154                 .scl_sda_cfg = &mrfld_config,
155                 .setup = mrfld_setup,
156         },
157         [baytrail] = {
158                 .bus_num = -1,
159                 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
160                 .tx_fifo_depth = 32,
161                 .rx_fifo_depth = 32,
162                 .functionality = I2C_FUNC_10BIT_ADDR,
163                 .scl_sda_cfg = &byt_config,
164         },
165         [haswell] = {
166                 .bus_num = -1,
167                 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
168                 .tx_fifo_depth = 32,
169                 .rx_fifo_depth = 32,
170                 .functionality = I2C_FUNC_10BIT_ADDR,
171                 .scl_sda_cfg = &hsw_config,
172         },
173 };
174
175 #ifdef CONFIG_PM
176 static int i2c_dw_pci_suspend(struct device *dev)
177 {
178         struct pci_dev *pdev = to_pci_dev(dev);
179
180         i2c_dw_disable(pci_get_drvdata(pdev));
181         return 0;
182 }
183
184 static int i2c_dw_pci_resume(struct device *dev)
185 {
186         struct pci_dev *pdev = to_pci_dev(dev);
187
188         return i2c_dw_init(pci_get_drvdata(pdev));
189 }
190 #endif
191
192 static UNIVERSAL_DEV_PM_OPS(i2c_dw_pm_ops, i2c_dw_pci_suspend,
193                             i2c_dw_pci_resume, NULL);
194
195 static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
196 {
197         return dev->controller->clk_khz;
198 }
199
200 static int i2c_dw_pci_probe(struct pci_dev *pdev,
201                             const struct pci_device_id *id)
202 {
203         struct dw_i2c_dev *dev;
204         struct i2c_adapter *adap;
205         int r;
206         struct dw_pci_controller *controller;
207         struct dw_scl_sda_cfg *cfg;
208
209         if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers)) {
210                 dev_err(&pdev->dev, "%s: invalid driver data %ld\n", __func__,
211                         id->driver_data);
212                 return -EINVAL;
213         }
214
215         controller = &dw_pci_controllers[id->driver_data];
216
217         r = pcim_enable_device(pdev);
218         if (r) {
219                 dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n",
220                         r);
221                 return r;
222         }
223
224         r = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
225         if (r) {
226                 dev_err(&pdev->dev, "I/O memory remapping failed\n");
227                 return r;
228         }
229
230         dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
231         if (!dev)
232                 return -ENOMEM;
233
234         dev->clk = NULL;
235         dev->controller = controller;
236         dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
237         dev->base = pcim_iomap_table(pdev)[0];
238         dev->dev = &pdev->dev;
239         dev->irq = pdev->irq;
240
241         if (controller->setup) {
242                 r = controller->setup(pdev, controller);
243                 if (r)
244                         return r;
245         }
246
247         dev->functionality = controller->functionality |
248                                 DW_IC_DEFAULT_FUNCTIONALITY;
249
250         dev->master_cfg = controller->bus_cfg;
251         if (controller->scl_sda_cfg) {
252                 cfg = controller->scl_sda_cfg;
253                 dev->ss_hcnt = cfg->ss_hcnt;
254                 dev->fs_hcnt = cfg->fs_hcnt;
255                 dev->ss_lcnt = cfg->ss_lcnt;
256                 dev->fs_lcnt = cfg->fs_lcnt;
257                 dev->sda_hold_time = cfg->sda_hold;
258         }
259
260         pci_set_drvdata(pdev, dev);
261
262         dev->tx_fifo_depth = controller->tx_fifo_depth;
263         dev->rx_fifo_depth = controller->rx_fifo_depth;
264
265         adap = &dev->adapter;
266         adap->owner = THIS_MODULE;
267         adap->class = 0;
268         ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
269         adap->nr = controller->bus_num;
270
271         r = i2c_dw_probe(dev);
272         if (r)
273                 return r;
274
275         pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
276         pm_runtime_use_autosuspend(&pdev->dev);
277         pm_runtime_put_autosuspend(&pdev->dev);
278         pm_runtime_allow(&pdev->dev);
279
280         return 0;
281 }
282
283 static void i2c_dw_pci_remove(struct pci_dev *pdev)
284 {
285         struct dw_i2c_dev *dev = pci_get_drvdata(pdev);
286
287         i2c_dw_disable(dev);
288         pm_runtime_forbid(&pdev->dev);
289         pm_runtime_get_noresume(&pdev->dev);
290
291         i2c_del_adapter(&dev->adapter);
292 }
293
294 /* work with hotplug and coldplug */
295 MODULE_ALIAS("i2c_designware-pci");
296
297 static const struct pci_device_id i2_designware_pci_ids[] = {
298         /* Medfield */
299         { PCI_VDEVICE(INTEL, 0x0817), medfield },
300         { PCI_VDEVICE(INTEL, 0x0818), medfield },
301         { PCI_VDEVICE(INTEL, 0x0819), medfield },
302         { PCI_VDEVICE(INTEL, 0x082C), medfield },
303         { PCI_VDEVICE(INTEL, 0x082D), medfield },
304         { PCI_VDEVICE(INTEL, 0x082E), medfield },
305         /* Merrifield */
306         { PCI_VDEVICE(INTEL, 0x1195), merrifield },
307         { PCI_VDEVICE(INTEL, 0x1196), merrifield },
308         /* Baytrail */
309         { PCI_VDEVICE(INTEL, 0x0F41), baytrail },
310         { PCI_VDEVICE(INTEL, 0x0F42), baytrail },
311         { PCI_VDEVICE(INTEL, 0x0F43), baytrail },
312         { PCI_VDEVICE(INTEL, 0x0F44), baytrail },
313         { PCI_VDEVICE(INTEL, 0x0F45), baytrail },
314         { PCI_VDEVICE(INTEL, 0x0F46), baytrail },
315         { PCI_VDEVICE(INTEL, 0x0F47), baytrail },
316         /* Haswell */
317         { PCI_VDEVICE(INTEL, 0x9c61), haswell },
318         { PCI_VDEVICE(INTEL, 0x9c62), haswell },
319         /* Braswell / Cherrytrail */
320         { PCI_VDEVICE(INTEL, 0x22C1), baytrail },
321         { PCI_VDEVICE(INTEL, 0x22C2), baytrail },
322         { PCI_VDEVICE(INTEL, 0x22C3), baytrail },
323         { PCI_VDEVICE(INTEL, 0x22C4), baytrail },
324         { PCI_VDEVICE(INTEL, 0x22C5), baytrail },
325         { PCI_VDEVICE(INTEL, 0x22C6), baytrail },
326         { PCI_VDEVICE(INTEL, 0x22C7), baytrail },
327         { 0,}
328 };
329 MODULE_DEVICE_TABLE(pci, i2_designware_pci_ids);
330
331 static struct pci_driver dw_i2c_driver = {
332         .name           = DRIVER_NAME,
333         .id_table       = i2_designware_pci_ids,
334         .probe          = i2c_dw_pci_probe,
335         .remove         = i2c_dw_pci_remove,
336         .driver         = {
337                 .pm     = &i2c_dw_pm_ops,
338         },
339 };
340
341 module_pci_driver(dw_i2c_driver);
342
343 MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
344 MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter");
345 MODULE_LICENSE("GPL");