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, 2015 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 {
54 struct dw_scl_sda_cfg {
62 struct dw_pci_controller {
69 struct dw_scl_sda_cfg *scl_sda_cfg;
72 #define INTEL_MID_STD_CFG (DW_IC_CON_MASTER | \
73 DW_IC_CON_SLAVE_DISABLE | \
76 #define DW_DEFAULT_FUNCTIONALITY (I2C_FUNC_I2C | \
77 I2C_FUNC_SMBUS_BYTE | \
78 I2C_FUNC_SMBUS_BYTE_DATA | \
79 I2C_FUNC_SMBUS_WORD_DATA | \
80 I2C_FUNC_SMBUS_I2C_BLOCK)
82 /* BayTrail HCNT/LCNT/SDA hold time */
83 static struct dw_scl_sda_cfg byt_config = {
91 /* Haswell HCNT/LCNT/SDA hold time */
92 static struct dw_scl_sda_cfg hsw_config = {
100 static struct dw_pci_controller dw_pci_controllers[] = {
103 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
110 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
117 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
124 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD,
131 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
138 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
145 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
148 .functionality = I2C_FUNC_10BIT_ADDR,
149 .scl_sda_cfg = &byt_config,
153 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
156 .functionality = I2C_FUNC_10BIT_ADDR,
157 .scl_sda_cfg = &hsw_config,
161 static struct i2c_algorithm i2c_dw_algo = {
162 .master_xfer = i2c_dw_xfer,
163 .functionality = i2c_dw_func,
167 static int i2c_dw_pci_suspend(struct device *dev)
169 struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
171 i2c_dw_disable(pci_get_drvdata(pdev));
175 static int i2c_dw_pci_resume(struct device *dev)
177 struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
179 return i2c_dw_init(pci_get_drvdata(pdev));
183 static UNIVERSAL_DEV_PM_OPS(i2c_dw_pm_ops, i2c_dw_pci_suspend,
184 i2c_dw_pci_resume, NULL);
186 static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
188 return dev->controller->clk_khz;
191 static int i2c_dw_pci_probe(struct pci_dev *pdev,
192 const struct pci_device_id *id)
194 struct dw_i2c_dev *dev;
195 struct i2c_adapter *adap;
197 struct dw_pci_controller *controller;
198 struct dw_scl_sda_cfg *cfg;
200 if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers)) {
201 dev_err(&pdev->dev, "%s: invalid driver data %ld\n", __func__,
206 controller = &dw_pci_controllers[id->driver_data];
208 r = pcim_enable_device(pdev);
210 dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n",
215 r = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
217 dev_err(&pdev->dev, "I/O memory remapping failed\n");
221 dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
225 init_completion(&dev->cmd_complete);
226 mutex_init(&dev->lock);
228 dev->controller = controller;
229 dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
230 dev->base = pcim_iomap_table(pdev)[0];
231 dev->dev = &pdev->dev;
232 dev->functionality = controller->functionality |
233 DW_DEFAULT_FUNCTIONALITY;
235 dev->master_cfg = controller->bus_cfg;
236 if (controller->scl_sda_cfg) {
237 cfg = controller->scl_sda_cfg;
238 dev->ss_hcnt = cfg->ss_hcnt;
239 dev->fs_hcnt = cfg->fs_hcnt;
240 dev->ss_lcnt = cfg->ss_lcnt;
241 dev->fs_lcnt = cfg->fs_lcnt;
242 dev->sda_hold_time = cfg->sda_hold;
245 pci_set_drvdata(pdev, dev);
247 dev->tx_fifo_depth = controller->tx_fifo_depth;
248 dev->rx_fifo_depth = controller->rx_fifo_depth;
249 r = i2c_dw_init(dev);
253 adap = &dev->adapter;
254 i2c_set_adapdata(adap, dev);
255 adap->owner = THIS_MODULE;
257 adap->algo = &i2c_dw_algo;
258 adap->dev.parent = &pdev->dev;
259 adap->nr = controller->bus_num;
261 snprintf(adap->name, sizeof(adap->name), "i2c-designware-pci");
263 r = devm_request_irq(&pdev->dev, pdev->irq, i2c_dw_isr, IRQF_SHARED,
266 dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
270 i2c_dw_disable_int(dev);
271 i2c_dw_clear_int(dev);
272 r = i2c_add_numbered_adapter(adap);
274 dev_err(&pdev->dev, "failure adding adapter\n");
278 pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
279 pm_runtime_use_autosuspend(&pdev->dev);
280 pm_runtime_put_autosuspend(&pdev->dev);
281 pm_runtime_allow(&pdev->dev);
286 static void i2c_dw_pci_remove(struct pci_dev *pdev)
288 struct dw_i2c_dev *dev = pci_get_drvdata(pdev);
291 pm_runtime_forbid(&pdev->dev);
292 pm_runtime_get_noresume(&pdev->dev);
294 i2c_del_adapter(&dev->adapter);
297 /* work with hotplug and coldplug */
298 MODULE_ALIAS("i2c_designware-pci");
300 static const struct pci_device_id i2_designware_pci_ids[] = {
302 { PCI_VDEVICE(INTEL, 0x0817), medfield_3 },
303 { PCI_VDEVICE(INTEL, 0x0818), medfield_4 },
304 { PCI_VDEVICE(INTEL, 0x0819), medfield_5 },
305 { PCI_VDEVICE(INTEL, 0x082C), medfield_0 },
306 { PCI_VDEVICE(INTEL, 0x082D), medfield_1 },
307 { PCI_VDEVICE(INTEL, 0x082E), medfield_2 },
309 { PCI_VDEVICE(INTEL, 0x0F41), baytrail },
310 { PCI_VDEVICE(INTEL, 0x0F42), baytrail },
311 { PCI_VDEVICE(INTEL, 0x0F43), baytrail },
312 { PCI_VDEVICE(INTEL, 0x0F44), baytrail },
313 { PCI_VDEVICE(INTEL, 0x0F45), baytrail },
314 { PCI_VDEVICE(INTEL, 0x0F46), baytrail },
315 { PCI_VDEVICE(INTEL, 0x0F47), baytrail },
317 { PCI_VDEVICE(INTEL, 0x9c61), haswell },
318 { PCI_VDEVICE(INTEL, 0x9c62), haswell },
319 /* Braswell / Cherrytrail */
320 { PCI_VDEVICE(INTEL, 0x22C1), baytrail },
321 { PCI_VDEVICE(INTEL, 0x22C2), baytrail },
322 { PCI_VDEVICE(INTEL, 0x22C3), baytrail },
323 { PCI_VDEVICE(INTEL, 0x22C4), baytrail },
324 { PCI_VDEVICE(INTEL, 0x22C5), baytrail },
325 { PCI_VDEVICE(INTEL, 0x22C6), baytrail },
326 { PCI_VDEVICE(INTEL, 0x22C7), baytrail },
329 MODULE_DEVICE_TABLE(pci, i2_designware_pci_ids);
331 static struct pci_driver dw_i2c_driver = {
333 .id_table = i2_designware_pci_ids,
334 .probe = i2c_dw_pci_probe,
335 .remove = i2c_dw_pci_remove,
337 .pm = &i2c_dw_pm_ops,
341 module_pci_driver(dw_i2c_driver);
343 MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
344 MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter");
345 MODULE_LICENSE("GPL");