2 * Synopsys DesignWare I2C adapter driver (master only).
4 * Based on the TI DAVINCI I2C adapter driver.
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.
11 * ----------------------------------------------------------------------------
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.
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.
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 * ----------------------------------------------------------------------------
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>
39 #include <linux/slab.h>
40 #include <linux/pci.h>
41 #include <linux/pm_runtime.h>
42 #include "i2c-designware-core.h"
44 #define DRIVER_NAME "i2c-designware-pci"
46 enum dw_pci_ctl_id_t {
59 struct dw_pci_controller {
67 #define INTEL_MID_STD_CFG (DW_IC_CON_MASTER | \
68 DW_IC_CON_SLAVE_DISABLE | \
71 static struct dw_pci_controller dw_pci_controllers[] = {
74 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
81 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
88 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
95 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
102 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
109 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
116 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD,
123 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
130 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
136 static struct i2c_algorithm i2c_dw_algo = {
137 .master_xfer = i2c_dw_xfer,
138 .functionality = i2c_dw_func,
141 static int i2c_dw_pci_suspend(struct device *dev)
143 struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
144 struct dw_i2c_dev *i2c = pci_get_drvdata(pdev);
150 err = pci_save_state(pdev);
152 dev_err(&pdev->dev, "pci_save_state failed\n");
156 err = pci_set_power_state(pdev, PCI_D3hot);
158 dev_err(&pdev->dev, "pci_set_power_state failed\n");
165 static int i2c_dw_pci_resume(struct device *dev)
167 struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
168 struct dw_i2c_dev *i2c = pci_get_drvdata(pdev);
172 enabled = i2c_dw_is_enabled(i2c);
176 err = pci_set_power_state(pdev, PCI_D0);
178 dev_err(&pdev->dev, "pci_set_power_state() failed\n");
182 pci_restore_state(pdev);
189 static int i2c_dw_pci_runtime_idle(struct device *dev)
191 int err = pm_schedule_suspend(dev, 500);
192 dev_dbg(dev, "runtime_idle called\n");
199 static const struct dev_pm_ops i2c_dw_pm_ops = {
200 .resume = i2c_dw_pci_resume,
201 .suspend = i2c_dw_pci_suspend,
202 SET_RUNTIME_PM_OPS(i2c_dw_pci_suspend, i2c_dw_pci_resume,
203 i2c_dw_pci_runtime_idle)
206 static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
208 return dev->controller->clk_khz;
211 static int __devinit i2c_dw_pci_probe(struct pci_dev *pdev,
212 const struct pci_device_id *id)
214 struct dw_i2c_dev *dev;
215 struct i2c_adapter *adap;
216 unsigned long start, len;
219 struct dw_pci_controller *controller;
221 if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers)) {
222 printk(KERN_ERR "dw_i2c_pci_probe: invalid driver data %ld\n",
227 controller = &dw_pci_controllers[id->driver_data];
229 r = pci_enable_device(pdev);
231 dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n",
236 /* Determine the address of the I2C area */
237 start = pci_resource_start(pdev, 0);
238 len = pci_resource_len(pdev, 0);
239 if (!start || len == 0) {
240 dev_err(&pdev->dev, "base address not set\n");
245 r = pci_request_region(pdev, 0, DRIVER_NAME);
247 dev_err(&pdev->dev, "failed to request I2C region "
248 "0x%lx-0x%lx\n", start,
249 (unsigned long)pci_resource_end(pdev, 0));
253 base = ioremap_nocache(start, len);
255 dev_err(&pdev->dev, "I/O memory remapping failed\n");
257 goto err_release_region;
261 dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL);
264 goto err_release_region;
267 init_completion(&dev->cmd_complete);
268 mutex_init(&dev->lock);
270 dev->controller = controller;
271 dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
273 dev->dev = get_device(&pdev->dev);
276 I2C_FUNC_SMBUS_BYTE |
277 I2C_FUNC_SMBUS_BYTE_DATA |
278 I2C_FUNC_SMBUS_WORD_DATA |
279 I2C_FUNC_SMBUS_I2C_BLOCK;
280 dev->master_cfg = controller->bus_cfg;
282 pci_set_drvdata(pdev, dev);
284 dev->tx_fifo_depth = controller->tx_fifo_depth;
285 dev->rx_fifo_depth = controller->rx_fifo_depth;
286 r = i2c_dw_init(dev);
290 adap = &dev->adapter;
291 i2c_set_adapdata(adap, dev);
292 adap->owner = THIS_MODULE;
294 adap->algo = &i2c_dw_algo;
295 adap->dev.parent = &pdev->dev;
296 adap->nr = controller->bus_num;
297 snprintf(adap->name, sizeof(adap->name), "i2c-designware-pci-%d",
300 r = request_irq(pdev->irq, i2c_dw_isr, IRQF_SHARED, adap->name, dev);
302 dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
306 i2c_dw_disable_int(dev);
307 i2c_dw_clear_int(dev);
308 r = i2c_add_numbered_adapter(adap);
310 dev_err(&pdev->dev, "failure adding adapter\n");
314 pm_runtime_put_noidle(&pdev->dev);
315 pm_runtime_allow(&pdev->dev);
320 free_irq(pdev->irq, dev);
323 pci_set_drvdata(pdev, NULL);
324 put_device(&pdev->dev);
327 pci_release_region(pdev, 0);
332 static void __devexit i2c_dw_pci_remove(struct pci_dev *pdev)
334 struct dw_i2c_dev *dev = pci_get_drvdata(pdev);
337 pm_runtime_forbid(&pdev->dev);
338 pm_runtime_get_noresume(&pdev->dev);
340 pci_set_drvdata(pdev, NULL);
341 i2c_del_adapter(&dev->adapter);
342 put_device(&pdev->dev);
344 free_irq(dev->irq, dev);
346 pci_release_region(pdev, 0);
349 /* work with hotplug and coldplug */
350 MODULE_ALIAS("i2c_designware-pci");
352 DEFINE_PCI_DEVICE_TABLE(i2_designware_pci_ids) = {
354 { PCI_VDEVICE(INTEL, 0x0802), moorestown_0 },
355 { PCI_VDEVICE(INTEL, 0x0803), moorestown_1 },
356 { PCI_VDEVICE(INTEL, 0x0804), moorestown_2 },
358 { PCI_VDEVICE(INTEL, 0x0817), medfield_3,},
359 { PCI_VDEVICE(INTEL, 0x0818), medfield_4 },
360 { PCI_VDEVICE(INTEL, 0x0819), medfield_5 },
361 { PCI_VDEVICE(INTEL, 0x082C), medfield_0 },
362 { PCI_VDEVICE(INTEL, 0x082D), medfield_1 },
363 { PCI_VDEVICE(INTEL, 0x082E), medfield_2 },
366 MODULE_DEVICE_TABLE(pci, i2_designware_pci_ids);
368 static struct pci_driver dw_i2c_driver = {
370 .id_table = i2_designware_pci_ids,
371 .probe = i2c_dw_pci_probe,
372 .remove = __devexit_p(i2c_dw_pci_remove),
374 .pm = &i2c_dw_pm_ops,
378 static int __init dw_i2c_init_driver(void)
380 return pci_register_driver(&dw_i2c_driver);
382 module_init(dw_i2c_init_driver);
384 static void __exit dw_i2c_exit_driver(void)
386 pci_unregister_driver(&dw_i2c_driver);
388 module_exit(dw_i2c_exit_driver);
390 MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
391 MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter");
392 MODULE_LICENSE("GPL");