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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> | |
9803f868 | 37 | #include <linux/of.h> |
2373f6b9 | 38 | #include <linux/platform_device.h> |
3bf3b289 | 39 | #include <linux/pm.h> |
7272194e | 40 | #include <linux/pm_runtime.h> |
2373f6b9 DB |
41 | #include <linux/io.h> |
42 | #include <linux/slab.h> | |
b61b1415 | 43 | #include <linux/acpi.h> |
2373f6b9 DB |
44 | #include "i2c-designware-core.h" |
45 | ||
46 | static struct i2c_algorithm i2c_dw_algo = { | |
47 | .master_xfer = i2c_dw_xfer, | |
48 | .functionality = i2c_dw_func, | |
49 | }; | |
1d31b58f DB |
50 | static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev) |
51 | { | |
52 | return clk_get_rate(dev->clk)/1000; | |
53 | } | |
2373f6b9 | 54 | |
b61b1415 | 55 | #ifdef CONFIG_ACPI |
57cd1e30 MW |
56 | static void dw_i2c_acpi_params(struct platform_device *pdev, char method[], |
57 | u16 *hcnt, u16 *lcnt, u32 *sda_hold) | |
58 | { | |
59 | struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; | |
60 | acpi_handle handle = ACPI_HANDLE(&pdev->dev); | |
61 | union acpi_object *obj; | |
62 | ||
63 | if (ACPI_FAILURE(acpi_evaluate_object(handle, method, NULL, &buf))) | |
64 | return; | |
65 | ||
66 | obj = (union acpi_object *)buf.pointer; | |
67 | if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 3) { | |
68 | const union acpi_object *objs = obj->package.elements; | |
69 | ||
70 | *hcnt = (u16)objs[0].integer.value; | |
71 | *lcnt = (u16)objs[1].integer.value; | |
72 | if (sda_hold) | |
73 | *sda_hold = (u32)objs[2].integer.value; | |
74 | } | |
75 | ||
76 | kfree(buf.pointer); | |
77 | } | |
78 | ||
b61b1415 MW |
79 | static int dw_i2c_acpi_configure(struct platform_device *pdev) |
80 | { | |
81 | struct dw_i2c_dev *dev = platform_get_drvdata(pdev); | |
57cd1e30 | 82 | bool fs_mode = dev->master_cfg & DW_IC_CON_SPEED_FAST; |
b61b1415 MW |
83 | |
84 | if (!ACPI_HANDLE(&pdev->dev)) | |
85 | return -ENODEV; | |
86 | ||
b61b1415 | 87 | dev->adapter.nr = -1; |
b61b1415 MW |
88 | dev->tx_fifo_depth = 32; |
89 | dev->rx_fifo_depth = 32; | |
57cd1e30 MW |
90 | |
91 | /* | |
92 | * Try to get SDA hold time and *CNT values from an ACPI method if | |
93 | * it exists for both supported speed modes. | |
94 | */ | |
95 | dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt, | |
96 | fs_mode ? NULL : &dev->sda_hold_time); | |
97 | dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt, | |
98 | fs_mode ? &dev->sda_hold_time : NULL); | |
99 | ||
b61b1415 MW |
100 | return 0; |
101 | } | |
102 | ||
103 | static const struct acpi_device_id dw_i2c_acpi_match[] = { | |
104 | { "INT33C2", 0 }, | |
105 | { "INT33C3", 0 }, | |
25b3dfc8 MW |
106 | { "INT3432", 0 }, |
107 | { "INT3433", 0 }, | |
5a7e6bd8 | 108 | { "80860F41", 0 }, |
b61b1415 MW |
109 | { } |
110 | }; | |
111 | MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match); | |
112 | #else | |
113 | static inline int dw_i2c_acpi_configure(struct platform_device *pdev) | |
114 | { | |
115 | return -ENODEV; | |
116 | } | |
117 | #endif | |
118 | ||
0b255e92 | 119 | static int dw_i2c_probe(struct platform_device *pdev) |
2373f6b9 DB |
120 | { |
121 | struct dw_i2c_dev *dev; | |
122 | struct i2c_adapter *adap; | |
1cb715ca | 123 | struct resource *mem; |
2373f6b9 DB |
124 | int irq, r; |
125 | ||
2373f6b9 DB |
126 | irq = platform_get_irq(pdev, 0); |
127 | if (irq < 0) { | |
128 | dev_err(&pdev->dev, "no irq resource?\n"); | |
129 | return irq; /* -ENXIO */ | |
130 | } | |
131 | ||
1cb715ca AS |
132 | dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL); |
133 | if (!dev) | |
134 | return -ENOMEM; | |
2373f6b9 | 135 | |
3cc2d009 | 136 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
1cb715ca AS |
137 | dev->base = devm_ioremap_resource(&pdev->dev, mem); |
138 | if (IS_ERR(dev->base)) | |
139 | return PTR_ERR(dev->base); | |
2373f6b9 DB |
140 | |
141 | init_completion(&dev->cmd_complete); | |
142 | mutex_init(&dev->lock); | |
1cb715ca | 143 | dev->dev = &pdev->dev; |
2373f6b9 DB |
144 | dev->irq = irq; |
145 | platform_set_drvdata(pdev, dev); | |
146 | ||
1cb715ca | 147 | dev->clk = devm_clk_get(&pdev->dev, NULL); |
1d31b58f DB |
148 | dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz; |
149 | ||
1cb715ca AS |
150 | if (IS_ERR(dev->clk)) |
151 | return PTR_ERR(dev->clk); | |
e1fac69f | 152 | clk_prepare_enable(dev->clk); |
2373f6b9 | 153 | |
9803f868 CR |
154 | if (pdev->dev.of_node) { |
155 | u32 ht = 0; | |
156 | u32 ic_clk = dev->get_clk_rate_khz(dev); | |
157 | ||
158 | of_property_read_u32(pdev->dev.of_node, | |
159 | "i2c-sda-hold-time-ns", &ht); | |
97191d73 VS |
160 | dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000, |
161 | 1000000); | |
6468276b RB |
162 | |
163 | of_property_read_u32(pdev->dev.of_node, | |
164 | "i2c-sda-falling-time-ns", | |
165 | &dev->sda_falling_time); | |
166 | of_property_read_u32(pdev->dev.of_node, | |
167 | "i2c-scl-falling-time-ns", | |
168 | &dev->scl_falling_time); | |
9803f868 CR |
169 | } |
170 | ||
2fa8326b DB |
171 | dev->functionality = |
172 | I2C_FUNC_I2C | | |
173 | I2C_FUNC_10BIT_ADDR | | |
174 | I2C_FUNC_SMBUS_BYTE | | |
175 | I2C_FUNC_SMBUS_BYTE_DATA | | |
176 | I2C_FUNC_SMBUS_WORD_DATA | | |
177 | I2C_FUNC_SMBUS_I2C_BLOCK; | |
e18563fc DB |
178 | dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | |
179 | DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST; | |
2fa8326b | 180 | |
b61b1415 MW |
181 | /* Try first if we can configure the device from ACPI */ |
182 | r = dw_i2c_acpi_configure(pdev); | |
183 | if (r) { | |
f3fa9f3d | 184 | u32 param1 = i2c_dw_read_comp_param(dev); |
2373f6b9 DB |
185 | |
186 | dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1; | |
187 | dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1; | |
b61b1415 | 188 | dev->adapter.nr = pdev->id; |
2373f6b9 DB |
189 | } |
190 | r = i2c_dw_init(dev); | |
191 | if (r) | |
1cb715ca | 192 | return r; |
2373f6b9 | 193 | |
f3fa9f3d | 194 | i2c_dw_disable_int(dev); |
1cb715ca AS |
195 | r = devm_request_irq(&pdev->dev, dev->irq, i2c_dw_isr, IRQF_SHARED, |
196 | pdev->name, dev); | |
2373f6b9 DB |
197 | if (r) { |
198 | dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq); | |
1cb715ca | 199 | return r; |
2373f6b9 DB |
200 | } |
201 | ||
202 | adap = &dev->adapter; | |
203 | i2c_set_adapdata(adap, dev); | |
204 | adap->owner = THIS_MODULE; | |
834f2d86 | 205 | adap->class = I2C_CLASS_HWMON | I2C_CLASS_DEPRECATED; |
2373f6b9 DB |
206 | strlcpy(adap->name, "Synopsys DesignWare I2C adapter", |
207 | sizeof(adap->name)); | |
208 | adap->algo = &i2c_dw_algo; | |
209 | adap->dev.parent = &pdev->dev; | |
af71100c | 210 | adap->dev.of_node = pdev->dev.of_node; |
2373f6b9 | 211 | |
2373f6b9 DB |
212 | r = i2c_add_numbered_adapter(adap); |
213 | if (r) { | |
214 | dev_err(&pdev->dev, "failure adding adapter\n"); | |
1cb715ca | 215 | return r; |
2373f6b9 DB |
216 | } |
217 | ||
43452335 MW |
218 | pm_runtime_set_autosuspend_delay(&pdev->dev, 1000); |
219 | pm_runtime_use_autosuspend(&pdev->dev); | |
7272194e MW |
220 | pm_runtime_set_active(&pdev->dev); |
221 | pm_runtime_enable(&pdev->dev); | |
7272194e | 222 | |
2373f6b9 | 223 | return 0; |
2373f6b9 DB |
224 | } |
225 | ||
0b255e92 | 226 | static int dw_i2c_remove(struct platform_device *pdev) |
2373f6b9 DB |
227 | { |
228 | struct dw_i2c_dev *dev = platform_get_drvdata(pdev); | |
2373f6b9 | 229 | |
7272194e MW |
230 | pm_runtime_get_sync(&pdev->dev); |
231 | ||
2373f6b9 | 232 | i2c_del_adapter(&dev->adapter); |
2373f6b9 | 233 | |
f3fa9f3d | 234 | i2c_dw_disable(dev); |
2373f6b9 | 235 | |
7272194e MW |
236 | pm_runtime_put(&pdev->dev); |
237 | pm_runtime_disable(&pdev->dev); | |
238 | ||
2373f6b9 DB |
239 | return 0; |
240 | } | |
241 | ||
af71100c RH |
242 | #ifdef CONFIG_OF |
243 | static const struct of_device_id dw_i2c_of_match[] = { | |
244 | { .compatible = "snps,designware-i2c", }, | |
245 | {}, | |
246 | }; | |
247 | MODULE_DEVICE_TABLE(of, dw_i2c_of_match); | |
248 | #endif | |
249 | ||
dfb03fb2 | 250 | #ifdef CONFIG_PM_SLEEP |
3bf3b289 DS |
251 | static int dw_i2c_suspend(struct device *dev) |
252 | { | |
253 | struct platform_device *pdev = to_platform_device(dev); | |
254 | struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); | |
255 | ||
f537295a | 256 | i2c_dw_disable(i_dev); |
e1fac69f | 257 | clk_disable_unprepare(i_dev->clk); |
3bf3b289 DS |
258 | |
259 | return 0; | |
260 | } | |
261 | ||
262 | static int dw_i2c_resume(struct device *dev) | |
263 | { | |
264 | struct platform_device *pdev = to_platform_device(dev); | |
265 | struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); | |
266 | ||
e1fac69f | 267 | clk_prepare_enable(i_dev->clk); |
3bf3b289 DS |
268 | i2c_dw_init(i_dev); |
269 | ||
270 | return 0; | |
271 | } | |
3bf3b289 DS |
272 | |
273 | static SIMPLE_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend, dw_i2c_resume); | |
dfb03fb2 JH |
274 | #define DW_I2C_DEV_PM_OPS (&dw_i2c_dev_pm_ops) |
275 | #else | |
276 | #define DW_I2C_DEV_PM_OPS NULL | |
277 | #endif | |
3bf3b289 | 278 | |
2373f6b9 DB |
279 | /* work with hotplug and coldplug */ |
280 | MODULE_ALIAS("platform:i2c_designware"); | |
281 | ||
282 | static struct platform_driver dw_i2c_driver = { | |
cccdcea1 WS |
283 | .probe = dw_i2c_probe, |
284 | .remove = dw_i2c_remove, | |
2373f6b9 DB |
285 | .driver = { |
286 | .name = "i2c_designware", | |
287 | .owner = THIS_MODULE, | |
af71100c | 288 | .of_match_table = of_match_ptr(dw_i2c_of_match), |
b61b1415 | 289 | .acpi_match_table = ACPI_PTR(dw_i2c_acpi_match), |
dfb03fb2 | 290 | .pm = DW_I2C_DEV_PM_OPS, |
2373f6b9 DB |
291 | }, |
292 | }; | |
293 | ||
294 | static int __init dw_i2c_init_driver(void) | |
295 | { | |
cccdcea1 | 296 | return platform_driver_register(&dw_i2c_driver); |
2373f6b9 | 297 | } |
10452280 | 298 | subsys_initcall(dw_i2c_init_driver); |
2373f6b9 DB |
299 | |
300 | static void __exit dw_i2c_exit_driver(void) | |
301 | { | |
302 | platform_driver_unregister(&dw_i2c_driver); | |
303 | } | |
304 | module_exit(dw_i2c_exit_driver); | |
305 | ||
306 | MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>"); | |
307 | MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter"); | |
308 | MODULE_LICENSE("GPL"); |