summaryrefslogtreecommitdiffstats
path: root/drivers/i2c/busses/i2c-designware-pcidrv.c
blob: 00e8f213f56e51ed15b12b551af627eff9ef00b7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
/*
 * Synopsys DesignWare I2C adapter driver (master only).
 *
 * Based on the TI DAVINCI I2C adapter driver.
 *
 * Copyright (C) 2006 Texas Instruments.
 * Copyright (C) 2007 MontaVista Software Inc.
 * Copyright (C) 2009 Provigent Ltd.
 * Copyright (C) 2011 Intel corporation.
 *
 * ----------------------------------------------------------------------------
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 * ----------------------------------------------------------------------------
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/pm_runtime.h>
#include "i2c-designware-core.h"

#define DRIVER_NAME "i2c-designware-pci"

enum dw_pci_ctl_id_t {
	moorestown_0,
	moorestown_1,
	moorestown_2,

	medfield_0,
	medfield_1,
	medfield_2,
	medfield_3,
	medfield_4,
	medfield_5,
};

struct dw_pci_controller {
	u32 bus_num;
	u32 bus_cfg;
	u32 tx_fifo_depth;
	u32 rx_fifo_depth;
	u32 clk_khz;
};

#define INTEL_MID_STD_CFG  (DW_IC_CON_MASTER |			\
				DW_IC_CON_SLAVE_DISABLE |	\
				DW_IC_CON_RESTART_EN)

static struct  dw_pci_controller  dw_pci_controllers[] = {
	[moorestown_0] = {
		.bus_num     = 0,
		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
		.tx_fifo_depth = 32,
		.rx_fifo_depth = 32,
		.clk_khz      = 25000,
	},
	[moorestown_1] = {
		.bus_num     = 1,
		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
		.tx_fifo_depth = 32,
		.rx_fifo_depth = 32,
		.clk_khz      = 25000,
	},
	[moorestown_2] = {
		.bus_num     = 2,
		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
		.tx_fifo_depth = 32,
		.rx_fifo_depth = 32,
		.clk_khz      = 25000,
	},
	[medfield_0] = {
		.bus_num     = 0,
		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
		.tx_fifo_depth = 32,
		.rx_fifo_depth = 32,
		.clk_khz      = 25000,
	},
	[medfield_1] = {
		.bus_num     = 1,
		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
		.tx_fifo_depth = 32,
		.rx_fifo_depth = 32,
		.clk_khz      = 25000,
	},
	[medfield_2] = {
		.bus_num     = 2,
		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
		.tx_fifo_depth = 32,
		.rx_fifo_depth = 32,
		.clk_khz      = 25000,
	},
	[medfield_3] = {
		.bus_num     = 3,
		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD,
		.tx_fifo_depth = 32,
		.rx_fifo_depth = 32,
		.clk_khz      = 25000,
	},
	[medfield_4] = {
		.bus_num     = 4,
		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
		.tx_fifo_depth = 32,
		.rx_fifo_depth = 32,
		.clk_khz      = 25000,
	},
	[medfield_5] = {
		.bus_num     = 5,
		.bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
		.tx_fifo_depth = 32,
		.rx_fifo_depth = 32,
		.clk_khz      = 25000,
	},
};
static struct i2c_algorithm i2c_dw_algo = {
	.master_xfer	= i2c_dw_xfer,
	.functionality	= i2c_dw_func,
};

static int i2c_dw_pci_suspend(struct device *dev)
{
	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
	struct dw_i2c_dev *i2c = pci_get_drvdata(pdev);
	int err;


	i2c_dw_disable(i2c);

	err = pci_save_state(pdev);
	if (err) {
		dev_err(&pdev->dev, "pci_save_state failed\n");
		return err;
	}

	err = pci_set_power_state(pdev, PCI_D3hot);
	if (err) {
		dev_err(&pdev->dev, "pci_set_power_state failed\n");
		return err;
	}

	return 0;
}

static int i2c_dw_pci_resume(struct device *dev)
{
	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
	struct dw_i2c_dev *i2c = pci_get_drvdata(pdev);
	int err;
	u32 enabled;

	enabled = i2c_dw_is_enabled(i2c);
	if (enabled)
		return 0;

	err = pci_set_power_state(pdev, PCI_D0);
	if (err) {
		dev_err(&pdev->dev, "pci_set_power_state() failed\n");
		return err;
	}

	pci_restore_state(pdev);

	i2c_dw_init(i2c);
	return 0;
}

static int i2c_dw_pci_runtime_idle(struct device *dev)
{
	int err = pm_schedule_suspend(dev, 500);
	dev_dbg(dev, "runtime_idle called\n");

	if (err != 0)
		return 0;
	return -EBUSY;
}

static const struct dev_pm_ops i2c_dw_pm_ops = {
	.resume         = i2c_dw_pci_resume,
	.suspend        = i2c_dw_pci_suspend,
	SET_RUNTIME_PM_OPS(i2c_dw_pci_suspend, i2c_dw_pci_resume,
			   i2c_dw_pci_runtime_idle)
};

static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
{
	return dev->controller->clk_khz;
}

static int __devinit i2c_dw_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
	struct dw_i2c_dev *dev;
	struct i2c_adapter *adap;
	unsigned long start, len;
	void __iomem *base;
	int r;
	struct  dw_pci_controller *controller;

	if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers)) {
		printk(KERN_ERR "dw_i2c_pci_probe: invalid driver data %ld\n",
			id->driver_data);
		return -EINVAL;
	}

	controller = &dw_pci_controllers[id->driver_data];

	r = pci_enable_device(pdev);
	if (r) {
		dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n",
			r);
		goto exit;
	}

	/* Determine the address of the I2C area */
	start = pci_resource_start(pdev, 0);
	len = pci_resource_len(pdev, 0);
	if (!start || len == 0) {
		dev_err(&pdev->dev, "base address not set\n");
		r = -ENODEV;
		goto exit;
	}

	r = pci_request_region(pdev, 0, DRIVER_NAME);
	if (r) {
		dev_err(&pdev->dev, "failed to request I2C region "
			"0x%lx-0x%lx\n", start,
			(unsigned long)pci_resource_end(pdev, 0));
		goto exit;
	}

	base = ioremap_nocache(start, len);
	if (!base) {
		dev_err(&pdev->dev, "I/O memory remapping failed\n");
		r = -ENOMEM;
		goto err_release_region;
	}


	dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL);
	if (!dev) {
		r = -ENOMEM;
		goto err_release_region;
	}

	init_completion(&dev->cmd_complete);
	mutex_init(&dev->lock);
	dev->clk = NULL;
	dev->controller = controller;
	dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
	dev->base = base;
	dev->dev = get_device(&pdev->dev);
	dev->functionality =
		I2C_FUNC_I2C |
		I2C_FUNC_SMBUS_BYTE |
		I2C_FUNC_SMBUS_BYTE_DATA |
		I2C_FUNC_SMBUS_WORD_DATA |
		I2C_FUNC_SMBUS_I2C_BLOCK;
	dev->master_cfg =  controller->bus_cfg;

	pci_set_drvdata(pdev, dev);

	dev->tx_fifo_depth = controller->tx_fifo_depth;
	dev->rx_fifo_depth = controller->rx_fifo_depth;
	r = i2c_dw_init(dev);
	if (r)
		goto err_iounmap;

	adap = &dev->adapter;
	i2c_set_adapdata(adap, dev);
	adap->owner = THIS_MODULE;
	adap->class = 0;
	adap->algo = &i2c_dw_algo;
	adap->dev.parent = &pdev->dev;
	adap->nr = controller->bus_num;
	snprintf(adap->name, sizeof(adap->name), "i2c-designware-pci-%d",
		adap->nr);

	r = request_irq(pdev->irq, i2c_dw_isr, IRQF_SHARED, adap->name, dev);
	if (r) {
		dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
		goto err_iounmap;
	}

	i2c_dw_disable_int(dev);
	i2c_dw_clear_int(dev);
	r = i2c_add_numbered_adapter(adap);
	if (r) {
		dev_err(&pdev->dev, "failure adding adapter\n");
		goto err_free_irq;
	}

	pm_runtime_put_noidle(&pdev->dev);
	pm_runtime_allow(&pdev->dev);

	return 0;

err_free_irq:
	free_irq(pdev->irq, dev);
err_iounmap:
	iounmap(dev->base);
	pci_set_drvdata(pdev, NULL);
	put_device(&pdev->dev);
	kfree(dev);
err_release_region:
	pci_release_region(pdev, 0);
exit:
	return r;
}

static void __devexit i2c_dw_pci_remove(struct pci_dev *pdev)
{
	struct dw_i2c_dev *dev = pci_get_drvdata(pdev);

	i2c_dw_disable(dev);
	pm_runtime_forbid(&pdev->dev);
	pm_runtime_get_noresume(&pdev->dev);

	pci_set_drvdata(pdev, NULL);
	i2c_del_adapter(&dev->adapter);
	put_device(&pdev->dev);

	free_irq(dev->irq, dev);
	kfree(dev);
	pci_release_region(pdev, 0);
}

/* work with hotplug and coldplug */
MODULE_ALIAS("i2c_designware-pci");

static DEFINE_PCI_DEVICE_TABLE(i2_designware_pci_ids) = {
	/* Moorestown */
	{ PCI_VDEVICE(INTEL, 0x0802), moorestown_0 },
	{ PCI_VDEVICE(INTEL, 0x0803), moorestown_1 },
	{ PCI_VDEVICE(INTEL, 0x0804), moorestown_2 },
	/* Medfield */
	{ PCI_VDEVICE(INTEL, 0x0817), medfield_3,},
	{ PCI_VDEVICE(INTEL, 0x0818), medfield_4 },
	{ PCI_VDEVICE(INTEL, 0x0819), medfield_5 },
	{ PCI_VDEVICE(INTEL, 0x082C), medfield_0 },
	{ PCI_VDEVICE(INTEL, 0x082D), medfield_1 },
	{ PCI_VDEVICE(INTEL, 0x082E), medfield_2 },
	{ 0,}
};
MODULE_DEVICE_TABLE(pci, i2_designware_pci_ids);

static struct pci_driver dw_i2c_driver = {
	.name		= DRIVER_NAME,
	.id_table	= i2_designware_pci_ids,
	.probe		= i2c_dw_pci_probe,
	.remove		= __devexit_p(i2c_dw_pci_remove),
	.driver         = {
		.pm     = &i2c_dw_pm_ops,
	},
};

static int __init dw_i2c_init_driver(void)
{
	return  pci_register_driver(&dw_i2c_driver);
}
module_init(dw_i2c_init_driver);

static void __exit dw_i2c_exit_driver(void)
{
	pci_unregister_driver(&dw_i2c_driver);
}
module_exit(dw_i2c_exit_driver);

MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud