83307ef3b41f709b4c1aad64b6c311edcac24e25
[linux-2.6.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 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  * You should have received a copy of the GNU General Public License
24  * along with this program; if not, write to the Free Software
25  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26  * ----------------------------------------------------------------------------
27  *
28  */
29
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/delay.h>
33 #include <linux/i2c.h>
34 #include <linux/errno.h>
35 #include <linux/sched.h>
36 #include <linux/err.h>
37 #include <linux/interrupt.h>
38 #include <linux/io.h>
39 #include <linux/slab.h>
40 #include <linux/pci.h>
41 #include "i2c-designware-core.h"
42
43 #define DRIVER_NAME "i2c-designware-pci"
44
45 enum dw_pci_ctl_id_t {
46         moorestown_0,
47         moorestown_1,
48         moorestown_2,
49
50         medfield_0,
51         medfield_1,
52         medfield_2,
53         medfield_3,
54         medfield_4,
55         medfield_5,
56 };
57
58 struct dw_pci_controller {
59         u32 bus_num;
60         u32 bus_cfg;
61         u32 tx_fifo_depth;
62         u32 rx_fifo_depth;
63         u32 clk_khz;
64 };
65
66 #define INTEL_MID_STD_CFG  (DW_IC_CON_MASTER |                  \
67                                 DW_IC_CON_SLAVE_DISABLE |       \
68                                 DW_IC_CON_RESTART_EN)
69
70 static struct  dw_pci_controller  dw_pci_controllers[] = {
71         [moorestown_0] = {
72                 .bus_num     = 0,
73                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
74                 .tx_fifo_depth = 32,
75                 .rx_fifo_depth = 32,
76                 .clk_khz      = 25000,
77         },
78         [moorestown_1] = {
79                 .bus_num     = 1,
80                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
81                 .tx_fifo_depth = 32,
82                 .rx_fifo_depth = 32,
83                 .clk_khz      = 25000,
84         },
85         [moorestown_2] = {
86                 .bus_num     = 2,
87                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
88                 .tx_fifo_depth = 32,
89                 .rx_fifo_depth = 32,
90                 .clk_khz      = 25000,
91         },
92         [medfield_0] = {
93                 .bus_num     = 0,
94                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
95                 .tx_fifo_depth = 32,
96                 .rx_fifo_depth = 32,
97                 .clk_khz      = 25000,
98         },
99         [medfield_1] = {
100                 .bus_num     = 1,
101                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
102                 .tx_fifo_depth = 32,
103                 .rx_fifo_depth = 32,
104                 .clk_khz      = 25000,
105         },
106         [medfield_2] = {
107                 .bus_num     = 2,
108                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
109                 .tx_fifo_depth = 32,
110                 .rx_fifo_depth = 32,
111                 .clk_khz      = 25000,
112         },
113         [medfield_3] = {
114                 .bus_num     = 3,
115                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD,
116                 .tx_fifo_depth = 32,
117                 .rx_fifo_depth = 32,
118                 .clk_khz      = 25000,
119         },
120         [medfield_4] = {
121                 .bus_num     = 4,
122                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
123                 .tx_fifo_depth = 32,
124                 .rx_fifo_depth = 32,
125                 .clk_khz      = 25000,
126         },
127         [medfield_5] = {
128                 .bus_num     = 5,
129                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
130                 .tx_fifo_depth = 32,
131                 .rx_fifo_depth = 32,
132                 .clk_khz      = 25000,
133         },
134 };
135 static struct i2c_algorithm i2c_dw_algo = {
136         .master_xfer    = i2c_dw_xfer,
137         .functionality  = i2c_dw_func,
138 };
139
140 static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
141 {
142         return dev->controller->clk_khz;
143 }
144
145 static int __devinit i2c_dw_pci_probe(struct pci_dev *pdev,
146 const struct pci_device_id *id)
147 {
148         struct dw_i2c_dev *dev;
149         struct i2c_adapter *adap;
150         unsigned long start, len;
151         void __iomem *base;
152         int r;
153         struct  dw_pci_controller *controller;
154
155         if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers)) {
156                 printk(KERN_ERR "dw_i2c_pci_probe: invalid driver data %ld\n",
157                         id->driver_data);
158                 return -EINVAL;
159         }
160
161         controller = &dw_pci_controllers[id->driver_data];
162
163         r = pci_enable_device(pdev);
164         if (r) {
165                 dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n",
166                         r);
167                 goto exit;
168         }
169
170         /* Determine the address of the I2C area */
171         start = pci_resource_start(pdev, 0);
172         len = pci_resource_len(pdev, 0);
173         if (!start || len == 0) {
174                 dev_err(&pdev->dev, "base address not set\n");
175                 r = -ENODEV;
176                 goto exit;
177         }
178
179         r = pci_request_region(pdev, 0, DRIVER_NAME);
180         if (r) {
181                 dev_err(&pdev->dev, "failed to request I2C region "
182                         "0x%lx-0x%lx\n", start,
183                         (unsigned long)pci_resource_end(pdev, 0));
184                 goto exit;
185         }
186
187         base = ioremap_nocache(start, len);
188         if (!base) {
189                 dev_err(&pdev->dev, "I/O memory remapping failed\n");
190                 r = -ENOMEM;
191                 goto err_release_region;
192         }
193
194
195         dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL);
196         if (!dev) {
197                 r = -ENOMEM;
198                 goto err_release_region;
199         }
200
201         init_completion(&dev->cmd_complete);
202         mutex_init(&dev->lock);
203         dev->clk = NULL;
204         dev->controller = controller;
205         dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
206         dev->base = base;
207         dev->dev = get_device(&pdev->dev);
208         dev->functionality =
209                 I2C_FUNC_I2C |
210                 I2C_FUNC_SMBUS_BYTE |
211                 I2C_FUNC_SMBUS_BYTE_DATA |
212                 I2C_FUNC_SMBUS_WORD_DATA |
213                 I2C_FUNC_SMBUS_I2C_BLOCK;
214         dev->master_cfg =  controller->bus_cfg;
215
216         pci_set_drvdata(pdev, dev);
217
218         dev->tx_fifo_depth = controller->tx_fifo_depth;
219         dev->rx_fifo_depth = controller->rx_fifo_depth;
220         r = i2c_dw_init(dev);
221         if (r)
222                 goto err_iounmap;
223
224         adap = &dev->adapter;
225         i2c_set_adapdata(adap, dev);
226         adap->owner = THIS_MODULE;
227         adap->class = 0;
228         adap->algo = &i2c_dw_algo;
229         adap->dev.parent = &pdev->dev;
230         adap->nr = controller->bus_num;
231         snprintf(adap->name, sizeof(adap->name), "i2c-designware-pci-%d",
232                 adap->nr);
233
234         r = request_irq(pdev->irq, i2c_dw_isr, IRQF_SHARED, adap->name, dev);
235         if (r) {
236                 dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
237                 goto err_iounmap;
238         }
239
240         i2c_dw_disable_int(dev);
241         i2c_dw_clear_int(dev);
242         r = i2c_add_numbered_adapter(adap);
243         if (r) {
244                 dev_err(&pdev->dev, "failure adding adapter\n");
245                 goto err_free_irq;
246         }
247
248         return 0;
249
250 err_free_irq:
251         free_irq(pdev->irq, dev);
252 err_iounmap:
253         iounmap(dev->base);
254         pci_set_drvdata(pdev, NULL);
255         put_device(&pdev->dev);
256         kfree(dev);
257 err_release_region:
258         pci_release_region(pdev, 0);
259 exit:
260         return r;
261 }
262
263 static void __devexit i2c_dw_pci_remove(struct pci_dev *pdev)
264 {
265         struct dw_i2c_dev *dev = pci_get_drvdata(pdev);
266
267         pci_set_drvdata(pdev, NULL);
268         i2c_del_adapter(&dev->adapter);
269         put_device(&pdev->dev);
270
271         free_irq(dev->irq, dev);
272         kfree(dev);
273         pci_release_region(pdev, 0);
274 }
275
276 /* work with hotplug and coldplug */
277 MODULE_ALIAS("i2c_designware-pci");
278
279 DEFINE_PCI_DEVICE_TABLE(i2_designware_pci_ids) = {
280         /* Moorestown */
281         { PCI_VDEVICE(INTEL, 0x0802), moorestown_0 },
282         { PCI_VDEVICE(INTEL, 0x0803), moorestown_1 },
283         { PCI_VDEVICE(INTEL, 0x0804), moorestown_2 },
284         /* Medfield */
285         { PCI_VDEVICE(INTEL, 0x0817), medfield_3,},
286         { PCI_VDEVICE(INTEL, 0x0818), medfield_4 },
287         { PCI_VDEVICE(INTEL, 0x0819), medfield_5 },
288         { PCI_VDEVICE(INTEL, 0x082C), medfield_0 },
289         { PCI_VDEVICE(INTEL, 0x082D), medfield_1 },
290         { PCI_VDEVICE(INTEL, 0x082E), medfield_2 },
291         { 0,}
292 };
293 MODULE_DEVICE_TABLE(pci, i2_designware_pci_ids);
294
295 static struct pci_driver dw_i2c_driver = {
296         .name           = DRIVER_NAME,
297         .id_table       = i2_designware_pci_ids,
298         .probe          = i2c_dw_pci_probe,
299         .remove         = __devexit_p(i2c_dw_pci_remove),
300 };
301
302 static int __init dw_i2c_init_driver(void)
303 {
304         return  pci_register_driver(&dw_i2c_driver);
305 }
306 module_init(dw_i2c_init_driver);
307
308 static void __exit dw_i2c_exit_driver(void)
309 {
310         pci_unregister_driver(&dw_i2c_driver);
311 }
312 module_exit(dw_i2c_exit_driver);
313
314 MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
315 MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter");
316 MODULE_LICENSE("GPL");