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>
40 #include <linux/pm_runtime.h>
42 #include <linux/slab.h>
43 #include <linux/acpi.h>
44 #include "i2c-designware-core.h"
46 static struct i2c_algorithm i2c_dw_algo
= {
47 .master_xfer
= i2c_dw_xfer
,
48 .functionality
= i2c_dw_func
,
50 static u32
i2c_dw_get_clk_rate_khz(struct dw_i2c_dev
*dev
)
52 return clk_get_rate(dev
->clk
)/1000;
56 static int dw_i2c_acpi_configure(struct platform_device
*pdev
)
58 struct dw_i2c_dev
*dev
= platform_get_drvdata(pdev
);
60 if (!ACPI_HANDLE(&pdev
->dev
))
64 dev
->tx_fifo_depth
= 32;
65 dev
->rx_fifo_depth
= 32;
69 static const struct acpi_device_id dw_i2c_acpi_match
[] = {
75 MODULE_DEVICE_TABLE(acpi
, dw_i2c_acpi_match
);
77 static inline int dw_i2c_acpi_configure(struct platform_device
*pdev
)
83 static int dw_i2c_probe(struct platform_device
*pdev
)
85 struct dw_i2c_dev
*dev
;
86 struct i2c_adapter
*adap
;
90 /* NOTE: driver uses the static register mapping */
91 mem
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
93 dev_err(&pdev
->dev
, "no mem resource?\n");
97 irq
= platform_get_irq(pdev
, 0);
99 dev_err(&pdev
->dev
, "no irq resource?\n");
100 return irq
; /* -ENXIO */
103 dev
= devm_kzalloc(&pdev
->dev
, sizeof(struct dw_i2c_dev
), GFP_KERNEL
);
107 dev
->base
= devm_ioremap_resource(&pdev
->dev
, mem
);
108 if (IS_ERR(dev
->base
))
109 return PTR_ERR(dev
->base
);
111 init_completion(&dev
->cmd_complete
);
112 mutex_init(&dev
->lock
);
113 dev
->dev
= &pdev
->dev
;
115 platform_set_drvdata(pdev
, dev
);
117 dev
->clk
= devm_clk_get(&pdev
->dev
, NULL
);
118 dev
->get_clk_rate_khz
= i2c_dw_get_clk_rate_khz
;
120 if (IS_ERR(dev
->clk
))
121 return PTR_ERR(dev
->clk
);
122 clk_prepare_enable(dev
->clk
);
126 I2C_FUNC_10BIT_ADDR
|
127 I2C_FUNC_SMBUS_BYTE
|
128 I2C_FUNC_SMBUS_BYTE_DATA
|
129 I2C_FUNC_SMBUS_WORD_DATA
|
130 I2C_FUNC_SMBUS_I2C_BLOCK
;
131 dev
->master_cfg
= DW_IC_CON_MASTER
| DW_IC_CON_SLAVE_DISABLE
|
132 DW_IC_CON_RESTART_EN
| DW_IC_CON_SPEED_FAST
;
134 /* Try first if we can configure the device from ACPI */
135 r
= dw_i2c_acpi_configure(pdev
);
137 u32 param1
= i2c_dw_read_comp_param(dev
);
139 dev
->tx_fifo_depth
= ((param1
>> 16) & 0xff) + 1;
140 dev
->rx_fifo_depth
= ((param1
>> 8) & 0xff) + 1;
141 dev
->adapter
.nr
= pdev
->id
;
143 r
= i2c_dw_init(dev
);
147 i2c_dw_disable_int(dev
);
148 r
= devm_request_irq(&pdev
->dev
, dev
->irq
, i2c_dw_isr
, IRQF_SHARED
,
151 dev_err(&pdev
->dev
, "failure requesting irq %i\n", dev
->irq
);
155 adap
= &dev
->adapter
;
156 i2c_set_adapdata(adap
, dev
);
157 adap
->owner
= THIS_MODULE
;
158 adap
->class = I2C_CLASS_HWMON
;
159 strlcpy(adap
->name
, "Synopsys DesignWare I2C adapter",
161 adap
->algo
= &i2c_dw_algo
;
162 adap
->dev
.parent
= &pdev
->dev
;
163 adap
->dev
.of_node
= pdev
->dev
.of_node
;
165 r
= i2c_add_numbered_adapter(adap
);
167 dev_err(&pdev
->dev
, "failure adding adapter\n");
170 of_i2c_register_devices(adap
);
171 acpi_i2c_register_devices(adap
);
173 pm_runtime_set_autosuspend_delay(&pdev
->dev
, 1000);
174 pm_runtime_use_autosuspend(&pdev
->dev
);
175 pm_runtime_set_active(&pdev
->dev
);
176 pm_runtime_enable(&pdev
->dev
);
181 static int dw_i2c_remove(struct platform_device
*pdev
)
183 struct dw_i2c_dev
*dev
= platform_get_drvdata(pdev
);
185 pm_runtime_get_sync(&pdev
->dev
);
187 i2c_del_adapter(&dev
->adapter
);
191 pm_runtime_put(&pdev
->dev
);
192 pm_runtime_disable(&pdev
->dev
);
198 static const struct of_device_id dw_i2c_of_match
[] = {
199 { .compatible
= "snps,designware-i2c", },
202 MODULE_DEVICE_TABLE(of
, dw_i2c_of_match
);
206 static int dw_i2c_suspend(struct device
*dev
)
208 struct platform_device
*pdev
= to_platform_device(dev
);
209 struct dw_i2c_dev
*i_dev
= platform_get_drvdata(pdev
);
211 clk_disable_unprepare(i_dev
->clk
);
216 static int dw_i2c_resume(struct device
*dev
)
218 struct platform_device
*pdev
= to_platform_device(dev
);
219 struct dw_i2c_dev
*i_dev
= platform_get_drvdata(pdev
);
221 clk_prepare_enable(i_dev
->clk
);
228 static SIMPLE_DEV_PM_OPS(dw_i2c_dev_pm_ops
, dw_i2c_suspend
, dw_i2c_resume
);
230 /* work with hotplug and coldplug */
231 MODULE_ALIAS("platform:i2c_designware");
233 static struct platform_driver dw_i2c_driver
= {
234 .remove
= dw_i2c_remove
,
236 .name
= "i2c_designware",
237 .owner
= THIS_MODULE
,
238 .of_match_table
= of_match_ptr(dw_i2c_of_match
),
239 .acpi_match_table
= ACPI_PTR(dw_i2c_acpi_match
),
240 .pm
= &dw_i2c_dev_pm_ops
,
244 static int __init
dw_i2c_init_driver(void)
246 return platform_driver_probe(&dw_i2c_driver
, dw_i2c_probe
);
248 subsys_initcall(dw_i2c_init_driver
);
250 static void __exit
dw_i2c_exit_driver(void)
252 platform_driver_unregister(&dw_i2c_driver
);
254 module_exit(dw_i2c_exit_driver
);
256 MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
257 MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter");
258 MODULE_LICENSE("GPL");