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");