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 {
62 struct dw_scl_sda_cfg {
70 struct dw_pci_controller {
77 struct dw_scl_sda_cfg *scl_sda_cfg;
80 #define INTEL_MID_STD_CFG (DW_IC_CON_MASTER | \
81 DW_IC_CON_SLAVE_DISABLE | \
84 #define DW_DEFAULT_FUNCTIONALITY (I2C_FUNC_I2C | \
85 I2C_FUNC_SMBUS_BYTE | \
86 I2C_FUNC_SMBUS_BYTE_DATA | \
87 I2C_FUNC_SMBUS_WORD_DATA | \
88 I2C_FUNC_SMBUS_I2C_BLOCK)
90 /* BayTrail HCNT/LCNT/SDA hold time */
91 static struct dw_scl_sda_cfg byt_config = {
99 /* Haswell HCNT/LCNT/SDA hold time */
100 static struct dw_scl_sda_cfg hsw_config = {
108 static struct dw_pci_controller dw_pci_controllers[] = {
111 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
118 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
125 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
132 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
139 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
146 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
153 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD,
160 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
167 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
174 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
178 .functionality = I2C_FUNC_10BIT_ADDR,
179 .scl_sda_cfg = &byt_config,
183 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
187 .functionality = I2C_FUNC_10BIT_ADDR,
188 .scl_sda_cfg = &hsw_config,
191 static struct i2c_algorithm i2c_dw_algo = {
192 .master_xfer = i2c_dw_xfer,
193 .functionality = i2c_dw_func,
197 static int i2c_dw_pci_suspend(struct device *dev)
199 struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
201 i2c_dw_disable(pci_get_drvdata(pdev));
205 static int i2c_dw_pci_resume(struct device *dev)
207 struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
209 return i2c_dw_init(pci_get_drvdata(pdev));
213 static UNIVERSAL_DEV_PM_OPS(i2c_dw_pm_ops, i2c_dw_pci_suspend,
214 i2c_dw_pci_resume, NULL);
216 static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
218 return dev->controller->clk_khz;
221 static int i2c_dw_pci_probe(struct pci_dev *pdev,
222 const struct pci_device_id *id)
224 struct dw_i2c_dev *dev;
225 struct i2c_adapter *adap;
227 struct dw_pci_controller *controller;
228 struct dw_scl_sda_cfg *cfg;
230 if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers)) {
231 dev_err(&pdev->dev, "%s: invalid driver data %ld\n", __func__,
236 controller = &dw_pci_controllers[id->driver_data];
238 r = pcim_enable_device(pdev);
240 dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n",
245 r = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
247 dev_err(&pdev->dev, "I/O memory remapping failed\n");
251 dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
255 init_completion(&dev->cmd_complete);
256 mutex_init(&dev->lock);
258 dev->controller = controller;
259 dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
260 dev->base = pcim_iomap_table(pdev)[0];
261 dev->dev = &pdev->dev;
262 dev->functionality = controller->functionality |
263 DW_DEFAULT_FUNCTIONALITY;
265 dev->master_cfg = controller->bus_cfg;
266 if (controller->scl_sda_cfg) {
267 cfg = controller->scl_sda_cfg;
268 dev->ss_hcnt = cfg->ss_hcnt;
269 dev->fs_hcnt = cfg->fs_hcnt;
270 dev->ss_lcnt = cfg->ss_lcnt;
271 dev->fs_lcnt = cfg->fs_lcnt;
272 dev->sda_hold_time = cfg->sda_hold;
275 pci_set_drvdata(pdev, dev);
277 dev->tx_fifo_depth = controller->tx_fifo_depth;
278 dev->rx_fifo_depth = controller->rx_fifo_depth;
279 r = i2c_dw_init(dev);
283 adap = &dev->adapter;
284 i2c_set_adapdata(adap, dev);
285 adap->owner = THIS_MODULE;
287 adap->algo = &i2c_dw_algo;
288 adap->dev.parent = &pdev->dev;
289 adap->nr = controller->bus_num;
291 snprintf(adap->name, sizeof(adap->name), "i2c-designware-pci");
293 r = devm_request_irq(&pdev->dev, pdev->irq, i2c_dw_isr, IRQF_SHARED,
296 dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
300 i2c_dw_disable_int(dev);
301 i2c_dw_clear_int(dev);
302 r = i2c_add_numbered_adapter(adap);
304 dev_err(&pdev->dev, "failure adding adapter\n");
308 pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
309 pm_runtime_use_autosuspend(&pdev->dev);
310 pm_runtime_put_autosuspend(&pdev->dev);
311 pm_runtime_allow(&pdev->dev);
316 static void i2c_dw_pci_remove(struct pci_dev *pdev)
318 struct dw_i2c_dev *dev = pci_get_drvdata(pdev);
321 pm_runtime_forbid(&pdev->dev);
322 pm_runtime_get_noresume(&pdev->dev);
324 i2c_del_adapter(&dev->adapter);
327 /* work with hotplug and coldplug */
328 MODULE_ALIAS("i2c_designware-pci");
330 static const struct pci_device_id i2_designware_pci_ids[] = {
332 { PCI_VDEVICE(INTEL, 0x0802), moorestown_0 },
333 { PCI_VDEVICE(INTEL, 0x0803), moorestown_1 },
334 { PCI_VDEVICE(INTEL, 0x0804), moorestown_2 },
336 { PCI_VDEVICE(INTEL, 0x0817), medfield_3,},
337 { PCI_VDEVICE(INTEL, 0x0818), medfield_4 },
338 { PCI_VDEVICE(INTEL, 0x0819), medfield_5 },
339 { PCI_VDEVICE(INTEL, 0x082C), medfield_0 },
340 { PCI_VDEVICE(INTEL, 0x082D), medfield_1 },
341 { PCI_VDEVICE(INTEL, 0x082E), medfield_2 },
343 { PCI_VDEVICE(INTEL, 0x0F41), baytrail },
344 { PCI_VDEVICE(INTEL, 0x0F42), baytrail },
345 { PCI_VDEVICE(INTEL, 0x0F43), baytrail },
346 { PCI_VDEVICE(INTEL, 0x0F44), baytrail },
347 { PCI_VDEVICE(INTEL, 0x0F45), baytrail },
348 { PCI_VDEVICE(INTEL, 0x0F46), baytrail },
349 { PCI_VDEVICE(INTEL, 0x0F47), baytrail },
351 { PCI_VDEVICE(INTEL, 0x9c61), haswell },
352 { PCI_VDEVICE(INTEL, 0x9c62), haswell },
355 MODULE_DEVICE_TABLE(pci, i2_designware_pci_ids);
357 static struct pci_driver dw_i2c_driver = {
359 .id_table = i2_designware_pci_ids,
360 .probe = i2c_dw_pci_probe,
361 .remove = i2c_dw_pci_remove,
363 .pm = &i2c_dw_pm_ops,
367 module_pci_driver(dw_i2c_driver);
369 MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
370 MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter");
371 MODULE_LICENSE("GPL");