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.
22 * ----------------------------------------------------------------------------
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/delay.h>
29 #include <linux/i2c.h>
30 #include <linux/errno.h>
31 #include <linux/sched.h>
32 #include <linux/err.h>
33 #include <linux/interrupt.h>
35 #include <linux/slab.h>
36 #include <linux/pci.h>
37 #include <linux/pm_runtime.h>
38 #include "i2c-designware-core.h"
40 #define DRIVER_NAME "i2c-designware-pci"
42 enum dw_pci_ctl_id_t {
58 struct dw_scl_sda_cfg {
66 struct dw_pci_controller {
73 struct dw_scl_sda_cfg *scl_sda_cfg;
76 #define INTEL_MID_STD_CFG (DW_IC_CON_MASTER | \
77 DW_IC_CON_SLAVE_DISABLE | \
80 #define DW_DEFAULT_FUNCTIONALITY (I2C_FUNC_I2C | \
81 I2C_FUNC_SMBUS_BYTE | \
82 I2C_FUNC_SMBUS_BYTE_DATA | \
83 I2C_FUNC_SMBUS_WORD_DATA | \
84 I2C_FUNC_SMBUS_I2C_BLOCK)
86 /* BayTrail HCNT/LCNT/SDA hold time */
87 static struct dw_scl_sda_cfg byt_config = {
95 /* Haswell HCNT/LCNT/SDA hold time */
96 static struct dw_scl_sda_cfg hsw_config = {
104 static struct dw_pci_controller dw_pci_controllers[] = {
107 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
114 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
121 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
128 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
135 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
142 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
149 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD,
156 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
163 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
170 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
174 .functionality = I2C_FUNC_10BIT_ADDR,
175 .scl_sda_cfg = &byt_config,
179 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
183 .functionality = I2C_FUNC_10BIT_ADDR,
184 .scl_sda_cfg = &hsw_config,
188 static struct i2c_algorithm i2c_dw_algo = {
189 .master_xfer = i2c_dw_xfer,
190 .functionality = i2c_dw_func,
194 static int i2c_dw_pci_suspend(struct device *dev)
196 struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
198 i2c_dw_disable(pci_get_drvdata(pdev));
202 static int i2c_dw_pci_resume(struct device *dev)
204 struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
206 return i2c_dw_init(pci_get_drvdata(pdev));
210 static UNIVERSAL_DEV_PM_OPS(i2c_dw_pm_ops, i2c_dw_pci_suspend,
211 i2c_dw_pci_resume, NULL);
213 static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
215 return dev->controller->clk_khz;
218 static int i2c_dw_pci_probe(struct pci_dev *pdev,
219 const struct pci_device_id *id)
221 struct dw_i2c_dev *dev;
222 struct i2c_adapter *adap;
224 struct dw_pci_controller *controller;
225 struct dw_scl_sda_cfg *cfg;
227 if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers)) {
228 dev_err(&pdev->dev, "%s: invalid driver data %ld\n", __func__,
233 controller = &dw_pci_controllers[id->driver_data];
235 r = pcim_enable_device(pdev);
237 dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n",
242 r = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
244 dev_err(&pdev->dev, "I/O memory remapping failed\n");
248 dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
252 init_completion(&dev->cmd_complete);
253 mutex_init(&dev->lock);
255 dev->controller = controller;
256 dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
257 dev->base = pcim_iomap_table(pdev)[0];
258 dev->dev = &pdev->dev;
259 dev->functionality = controller->functionality |
260 DW_DEFAULT_FUNCTIONALITY;
262 dev->master_cfg = controller->bus_cfg;
263 if (controller->scl_sda_cfg) {
264 cfg = controller->scl_sda_cfg;
265 dev->ss_hcnt = cfg->ss_hcnt;
266 dev->fs_hcnt = cfg->fs_hcnt;
267 dev->ss_lcnt = cfg->ss_lcnt;
268 dev->fs_lcnt = cfg->fs_lcnt;
269 dev->sda_hold_time = cfg->sda_hold;
272 pci_set_drvdata(pdev, dev);
274 dev->tx_fifo_depth = controller->tx_fifo_depth;
275 dev->rx_fifo_depth = controller->rx_fifo_depth;
276 r = i2c_dw_init(dev);
280 adap = &dev->adapter;
281 i2c_set_adapdata(adap, dev);
282 adap->owner = THIS_MODULE;
284 adap->algo = &i2c_dw_algo;
285 adap->dev.parent = &pdev->dev;
286 adap->nr = controller->bus_num;
288 snprintf(adap->name, sizeof(adap->name), "i2c-designware-pci");
290 r = devm_request_irq(&pdev->dev, pdev->irq, i2c_dw_isr, IRQF_SHARED,
293 dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
297 i2c_dw_disable_int(dev);
298 i2c_dw_clear_int(dev);
299 r = i2c_add_numbered_adapter(adap);
301 dev_err(&pdev->dev, "failure adding adapter\n");
305 pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
306 pm_runtime_use_autosuspend(&pdev->dev);
307 pm_runtime_put_autosuspend(&pdev->dev);
308 pm_runtime_allow(&pdev->dev);
313 static void i2c_dw_pci_remove(struct pci_dev *pdev)
315 struct dw_i2c_dev *dev = pci_get_drvdata(pdev);
318 pm_runtime_forbid(&pdev->dev);
319 pm_runtime_get_noresume(&pdev->dev);
321 i2c_del_adapter(&dev->adapter);
324 /* work with hotplug and coldplug */
325 MODULE_ALIAS("i2c_designware-pci");
327 static const struct pci_device_id i2_designware_pci_ids[] = {
329 { PCI_VDEVICE(INTEL, 0x0802), moorestown_0 },
330 { PCI_VDEVICE(INTEL, 0x0803), moorestown_1 },
331 { PCI_VDEVICE(INTEL, 0x0804), moorestown_2 },
333 { PCI_VDEVICE(INTEL, 0x0817), medfield_3,},
334 { PCI_VDEVICE(INTEL, 0x0818), medfield_4 },
335 { PCI_VDEVICE(INTEL, 0x0819), medfield_5 },
336 { PCI_VDEVICE(INTEL, 0x082C), medfield_0 },
337 { PCI_VDEVICE(INTEL, 0x082D), medfield_1 },
338 { PCI_VDEVICE(INTEL, 0x082E), medfield_2 },
340 { PCI_VDEVICE(INTEL, 0x0F41), baytrail },
341 { PCI_VDEVICE(INTEL, 0x0F42), baytrail },
342 { PCI_VDEVICE(INTEL, 0x0F43), baytrail },
343 { PCI_VDEVICE(INTEL, 0x0F44), baytrail },
344 { PCI_VDEVICE(INTEL, 0x0F45), baytrail },
345 { PCI_VDEVICE(INTEL, 0x0F46), baytrail },
346 { PCI_VDEVICE(INTEL, 0x0F47), baytrail },
348 { PCI_VDEVICE(INTEL, 0x9c61), haswell },
349 { PCI_VDEVICE(INTEL, 0x9c62), haswell },
350 /* Braswell / Cherrytrail */
351 { PCI_VDEVICE(INTEL, 0x22C1), baytrail,},
352 { PCI_VDEVICE(INTEL, 0x22C2), baytrail },
353 { PCI_VDEVICE(INTEL, 0x22C3), baytrail },
354 { PCI_VDEVICE(INTEL, 0x22C4), baytrail },
355 { PCI_VDEVICE(INTEL, 0x22C5), baytrail },
356 { PCI_VDEVICE(INTEL, 0x22C6), baytrail },
357 { PCI_VDEVICE(INTEL, 0x22C7), baytrail },
360 MODULE_DEVICE_TABLE(pci, i2_designware_pci_ids);
362 static struct pci_driver dw_i2c_driver = {
364 .id_table = i2_designware_pci_ids,
365 .probe = i2c_dw_pci_probe,
366 .remove = i2c_dw_pci_remove,
368 .pm = &i2c_dw_pm_ops,
372 module_pci_driver(dw_i2c_driver);
374 MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
375 MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter");
376 MODULE_LICENSE("GPL");