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.
10 * ----------------------------------------------------------------------------
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 * ----------------------------------------------------------------------------
28 #include <linux/kernel.h>
29 #include <linux/module.h>
30 #include <linux/delay.h>
31 #include <linux/i2c.h>
32 #include <linux/clk.h>
33 #include <linux/errno.h>
34 #include <linux/sched.h>
35 #include <linux/err.h>
36 #include <linux/interrupt.h>
37 #include <linux/of_i2c.h>
38 #include <linux/platform_device.h>
41 #include <linux/slab.h>
42 #include "i2c-designware-core.h"
44 static struct i2c_algorithm i2c_dw_algo
= {
45 .master_xfer
= i2c_dw_xfer
,
46 .functionality
= i2c_dw_func
,
48 static u32
i2c_dw_get_clk_rate_khz(struct dw_i2c_dev
*dev
)
50 return clk_get_rate(dev
->clk
)/1000;
53 static int __devinit
dw_i2c_probe(struct platform_device
*pdev
)
55 struct dw_i2c_dev
*dev
;
56 struct i2c_adapter
*adap
;
57 struct resource
*mem
, *ioarea
;
60 /* NOTE: driver uses the static register mapping */
61 mem
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
63 dev_err(&pdev
->dev
, "no mem resource?\n");
67 irq
= platform_get_irq(pdev
, 0);
69 dev_err(&pdev
->dev
, "no irq resource?\n");
70 return irq
; /* -ENXIO */
73 ioarea
= request_mem_region(mem
->start
, resource_size(mem
),
76 dev_err(&pdev
->dev
, "I2C region already claimed\n");
80 dev
= kzalloc(sizeof(struct dw_i2c_dev
), GFP_KERNEL
);
83 goto err_release_region
;
86 init_completion(&dev
->cmd_complete
);
87 mutex_init(&dev
->lock
);
88 dev
->dev
= get_device(&pdev
->dev
);
90 platform_set_drvdata(pdev
, dev
);
92 dev
->clk
= clk_get(&pdev
->dev
, NULL
);
93 dev
->get_clk_rate_khz
= i2c_dw_get_clk_rate_khz
;
95 if (IS_ERR(dev
->clk
)) {
99 clk_prepare_enable(dev
->clk
);
103 I2C_FUNC_10BIT_ADDR
|
104 I2C_FUNC_SMBUS_BYTE
|
105 I2C_FUNC_SMBUS_BYTE_DATA
|
106 I2C_FUNC_SMBUS_WORD_DATA
|
107 I2C_FUNC_SMBUS_I2C_BLOCK
;
108 dev
->master_cfg
= DW_IC_CON_MASTER
| DW_IC_CON_SLAVE_DISABLE
|
109 DW_IC_CON_RESTART_EN
| DW_IC_CON_SPEED_FAST
;
111 dev
->base
= ioremap(mem
->start
, resource_size(mem
));
112 if (dev
->base
== NULL
) {
113 dev_err(&pdev
->dev
, "failure mapping io resources\n");
115 goto err_unuse_clocks
;
118 u32 param1
= i2c_dw_read_comp_param(dev
);
120 dev
->tx_fifo_depth
= ((param1
>> 16) & 0xff) + 1;
121 dev
->rx_fifo_depth
= ((param1
>> 8) & 0xff) + 1;
123 r
= i2c_dw_init(dev
);
127 i2c_dw_disable_int(dev
);
128 r
= request_irq(dev
->irq
, i2c_dw_isr
, IRQF_DISABLED
, pdev
->name
, dev
);
130 dev_err(&pdev
->dev
, "failure requesting irq %i\n", dev
->irq
);
134 adap
= &dev
->adapter
;
135 i2c_set_adapdata(adap
, dev
);
136 adap
->owner
= THIS_MODULE
;
137 adap
->class = I2C_CLASS_HWMON
;
138 strlcpy(adap
->name
, "Synopsys DesignWare I2C adapter",
140 adap
->algo
= &i2c_dw_algo
;
141 adap
->dev
.parent
= &pdev
->dev
;
142 adap
->dev
.of_node
= pdev
->dev
.of_node
;
145 r
= i2c_add_numbered_adapter(adap
);
147 dev_err(&pdev
->dev
, "failure adding adapter\n");
150 of_i2c_register_devices(adap
);
155 free_irq(dev
->irq
, dev
);
159 clk_disable_unprepare(dev
->clk
);
163 platform_set_drvdata(pdev
, NULL
);
164 put_device(&pdev
->dev
);
167 release_mem_region(mem
->start
, resource_size(mem
));
172 static int __devexit
dw_i2c_remove(struct platform_device
*pdev
)
174 struct dw_i2c_dev
*dev
= platform_get_drvdata(pdev
);
175 struct resource
*mem
;
177 platform_set_drvdata(pdev
, NULL
);
178 i2c_del_adapter(&dev
->adapter
);
179 put_device(&pdev
->dev
);
181 clk_disable_unprepare(dev
->clk
);
186 free_irq(dev
->irq
, dev
);
189 mem
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
190 release_mem_region(mem
->start
, resource_size(mem
));
195 static const struct of_device_id dw_i2c_of_match
[] = {
196 { .compatible
= "snps,designware-i2c", },
199 MODULE_DEVICE_TABLE(of
, dw_i2c_of_match
);
203 static int dw_i2c_suspend(struct device
*dev
)
205 struct platform_device
*pdev
= to_platform_device(dev
);
206 struct dw_i2c_dev
*i_dev
= platform_get_drvdata(pdev
);
208 clk_disable_unprepare(i_dev
->clk
);
213 static int dw_i2c_resume(struct device
*dev
)
215 struct platform_device
*pdev
= to_platform_device(dev
);
216 struct dw_i2c_dev
*i_dev
= platform_get_drvdata(pdev
);
218 clk_prepare_enable(i_dev
->clk
);
225 static SIMPLE_DEV_PM_OPS(dw_i2c_dev_pm_ops
, dw_i2c_suspend
, dw_i2c_resume
);
227 /* work with hotplug and coldplug */
228 MODULE_ALIAS("platform:i2c_designware");
230 static struct platform_driver dw_i2c_driver
= {
231 .remove
= __devexit_p(dw_i2c_remove
),
233 .name
= "i2c_designware",
234 .owner
= THIS_MODULE
,
235 .of_match_table
= of_match_ptr(dw_i2c_of_match
),
236 .pm
= &dw_i2c_dev_pm_ops
,
240 static int __init
dw_i2c_init_driver(void)
242 return platform_driver_probe(&dw_i2c_driver
, dw_i2c_probe
);
244 subsys_initcall(dw_i2c_init_driver
);
246 static void __exit
dw_i2c_exit_driver(void)
248 platform_driver_unregister(&dw_i2c_driver
);
250 module_exit(dw_i2c_exit_driver
);
252 MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
253 MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter");
254 MODULE_LICENSE("GPL");