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2373f6b9 DB |
1 | /* |
2 | * Synopsys DesignWare I2C adapter driver (master only). | |
3 | * | |
4 | * Based on the TI DAVINCI I2C adapter driver. | |
5 | * | |
6 | * Copyright (C) 2006 Texas Instruments. | |
7 | * Copyright (C) 2007 MontaVista Software Inc. | |
8 | * Copyright (C) 2009 Provigent Ltd. | |
9 | * | |
10 | * ---------------------------------------------------------------------------- | |
11 | * | |
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. | |
16 | * | |
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. | |
21 | * | |
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 | * ---------------------------------------------------------------------------- | |
26 | * | |
27 | */ | |
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> | |
af71100c | 37 | #include <linux/of_i2c.h> |
2373f6b9 | 38 | #include <linux/platform_device.h> |
3bf3b289 | 39 | #include <linux/pm.h> |
2373f6b9 DB |
40 | #include <linux/io.h> |
41 | #include <linux/slab.h> | |
42 | #include "i2c-designware-core.h" | |
43 | ||
44 | static struct i2c_algorithm i2c_dw_algo = { | |
45 | .master_xfer = i2c_dw_xfer, | |
46 | .functionality = i2c_dw_func, | |
47 | }; | |
1d31b58f DB |
48 | static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev) |
49 | { | |
50 | return clk_get_rate(dev->clk)/1000; | |
51 | } | |
2373f6b9 DB |
52 | |
53 | static int __devinit dw_i2c_probe(struct platform_device *pdev) | |
54 | { | |
55 | struct dw_i2c_dev *dev; | |
56 | struct i2c_adapter *adap; | |
57 | struct resource *mem, *ioarea; | |
58 | int irq, r; | |
59 | ||
60 | /* NOTE: driver uses the static register mapping */ | |
61 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
62 | if (!mem) { | |
63 | dev_err(&pdev->dev, "no mem resource?\n"); | |
64 | return -EINVAL; | |
65 | } | |
66 | ||
67 | irq = platform_get_irq(pdev, 0); | |
68 | if (irq < 0) { | |
69 | dev_err(&pdev->dev, "no irq resource?\n"); | |
70 | return irq; /* -ENXIO */ | |
71 | } | |
72 | ||
73 | ioarea = request_mem_region(mem->start, resource_size(mem), | |
74 | pdev->name); | |
75 | if (!ioarea) { | |
76 | dev_err(&pdev->dev, "I2C region already claimed\n"); | |
77 | return -EBUSY; | |
78 | } | |
79 | ||
80 | dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL); | |
81 | if (!dev) { | |
82 | r = -ENOMEM; | |
83 | goto err_release_region; | |
84 | } | |
85 | ||
86 | init_completion(&dev->cmd_complete); | |
87 | mutex_init(&dev->lock); | |
88 | dev->dev = get_device(&pdev->dev); | |
89 | dev->irq = irq; | |
90 | platform_set_drvdata(pdev, dev); | |
91 | ||
92 | dev->clk = clk_get(&pdev->dev, NULL); | |
1d31b58f DB |
93 | dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz; |
94 | ||
2373f6b9 DB |
95 | if (IS_ERR(dev->clk)) { |
96 | r = -ENODEV; | |
97 | goto err_free_mem; | |
98 | } | |
e1fac69f | 99 | clk_prepare_enable(dev->clk); |
2373f6b9 | 100 | |
2fa8326b DB |
101 | dev->functionality = |
102 | I2C_FUNC_I2C | | |
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; | |
e18563fc DB |
108 | dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | |
109 | DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST; | |
2fa8326b | 110 | |
2373f6b9 DB |
111 | dev->base = ioremap(mem->start, resource_size(mem)); |
112 | if (dev->base == NULL) { | |
113 | dev_err(&pdev->dev, "failure mapping io resources\n"); | |
114 | r = -EBUSY; | |
115 | goto err_unuse_clocks; | |
116 | } | |
117 | { | |
f3fa9f3d | 118 | u32 param1 = i2c_dw_read_comp_param(dev); |
2373f6b9 DB |
119 | |
120 | dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1; | |
121 | dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1; | |
122 | } | |
123 | r = i2c_dw_init(dev); | |
124 | if (r) | |
125 | goto err_iounmap; | |
126 | ||
f3fa9f3d | 127 | i2c_dw_disable_int(dev); |
2373f6b9 DB |
128 | r = request_irq(dev->irq, i2c_dw_isr, IRQF_DISABLED, pdev->name, dev); |
129 | if (r) { | |
130 | dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq); | |
131 | goto err_iounmap; | |
132 | } | |
133 | ||
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", | |
139 | sizeof(adap->name)); | |
140 | adap->algo = &i2c_dw_algo; | |
141 | adap->dev.parent = &pdev->dev; | |
af71100c | 142 | adap->dev.of_node = pdev->dev.of_node; |
2373f6b9 DB |
143 | |
144 | adap->nr = pdev->id; | |
145 | r = i2c_add_numbered_adapter(adap); | |
146 | if (r) { | |
147 | dev_err(&pdev->dev, "failure adding adapter\n"); | |
148 | goto err_free_irq; | |
149 | } | |
af71100c | 150 | of_i2c_register_devices(adap); |
2373f6b9 DB |
151 | |
152 | return 0; | |
153 | ||
154 | err_free_irq: | |
155 | free_irq(dev->irq, dev); | |
156 | err_iounmap: | |
157 | iounmap(dev->base); | |
158 | err_unuse_clocks: | |
e1fac69f | 159 | clk_disable_unprepare(dev->clk); |
2373f6b9 DB |
160 | clk_put(dev->clk); |
161 | dev->clk = NULL; | |
162 | err_free_mem: | |
163 | platform_set_drvdata(pdev, NULL); | |
164 | put_device(&pdev->dev); | |
165 | kfree(dev); | |
166 | err_release_region: | |
167 | release_mem_region(mem->start, resource_size(mem)); | |
168 | ||
169 | return r; | |
170 | } | |
171 | ||
172 | static int __devexit dw_i2c_remove(struct platform_device *pdev) | |
173 | { | |
174 | struct dw_i2c_dev *dev = platform_get_drvdata(pdev); | |
175 | struct resource *mem; | |
176 | ||
177 | platform_set_drvdata(pdev, NULL); | |
178 | i2c_del_adapter(&dev->adapter); | |
179 | put_device(&pdev->dev); | |
180 | ||
e1fac69f | 181 | clk_disable_unprepare(dev->clk); |
2373f6b9 DB |
182 | clk_put(dev->clk); |
183 | dev->clk = NULL; | |
184 | ||
f3fa9f3d | 185 | i2c_dw_disable(dev); |
2373f6b9 DB |
186 | free_irq(dev->irq, dev); |
187 | kfree(dev); | |
188 | ||
189 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
190 | release_mem_region(mem->start, resource_size(mem)); | |
191 | return 0; | |
192 | } | |
193 | ||
af71100c RH |
194 | #ifdef CONFIG_OF |
195 | static const struct of_device_id dw_i2c_of_match[] = { | |
196 | { .compatible = "snps,designware-i2c", }, | |
197 | {}, | |
198 | }; | |
199 | MODULE_DEVICE_TABLE(of, dw_i2c_of_match); | |
200 | #endif | |
201 | ||
3bf3b289 DS |
202 | #ifdef CONFIG_PM |
203 | static int dw_i2c_suspend(struct device *dev) | |
204 | { | |
205 | struct platform_device *pdev = to_platform_device(dev); | |
206 | struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); | |
207 | ||
e1fac69f | 208 | clk_disable_unprepare(i_dev->clk); |
3bf3b289 DS |
209 | |
210 | return 0; | |
211 | } | |
212 | ||
213 | static int dw_i2c_resume(struct device *dev) | |
214 | { | |
215 | struct platform_device *pdev = to_platform_device(dev); | |
216 | struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); | |
217 | ||
e1fac69f | 218 | clk_prepare_enable(i_dev->clk); |
3bf3b289 DS |
219 | i2c_dw_init(i_dev); |
220 | ||
221 | return 0; | |
222 | } | |
223 | #endif | |
224 | ||
225 | static SIMPLE_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend, dw_i2c_resume); | |
226 | ||
2373f6b9 DB |
227 | /* work with hotplug and coldplug */ |
228 | MODULE_ALIAS("platform:i2c_designware"); | |
229 | ||
230 | static struct platform_driver dw_i2c_driver = { | |
231 | .remove = __devexit_p(dw_i2c_remove), | |
232 | .driver = { | |
233 | .name = "i2c_designware", | |
234 | .owner = THIS_MODULE, | |
af71100c | 235 | .of_match_table = of_match_ptr(dw_i2c_of_match), |
3bf3b289 | 236 | .pm = &dw_i2c_dev_pm_ops, |
2373f6b9 DB |
237 | }, |
238 | }; | |
239 | ||
240 | static int __init dw_i2c_init_driver(void) | |
241 | { | |
242 | return platform_driver_probe(&dw_i2c_driver, dw_i2c_probe); | |
243 | } | |
10452280 | 244 | subsys_initcall(dw_i2c_init_driver); |
2373f6b9 DB |
245 | |
246 | static void __exit dw_i2c_exit_driver(void) | |
247 | { | |
248 | platform_driver_unregister(&dw_i2c_driver); | |
249 | } | |
250 | module_exit(dw_i2c_exit_driver); | |
251 | ||
252 | MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>"); | |
253 | MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter"); | |
254 | MODULE_LICENSE("GPL"); |