x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / i2c / busses / i2c-designware-platdrv.c
blob0aa01136f8d955148d984ac00e06ffb9e8ce1196
1 /*
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.h>
38 #include <linux/platform_device.h>
39 #include <linux/pm.h>
40 #include <linux/pm_runtime.h>
41 #include <linux/io.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;
55 #ifdef CONFIG_ACPI
56 static void dw_i2c_acpi_params(struct platform_device *pdev, char method[],
57 u16 *hcnt, u16 *lcnt, u32 *sda_hold)
59 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
60 acpi_handle handle = ACPI_HANDLE(&pdev->dev);
61 union acpi_object *obj;
63 if (ACPI_FAILURE(acpi_evaluate_object(handle, method, NULL, &buf)))
64 return;
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;
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;
76 kfree(buf.pointer);
79 static int dw_i2c_acpi_configure(struct platform_device *pdev)
81 struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
82 bool fs_mode = dev->master_cfg & DW_IC_CON_SPEED_FAST;
84 if (!ACPI_HANDLE(&pdev->dev))
85 return -ENODEV;
87 dev->adapter.nr = -1;
88 dev->tx_fifo_depth = 32;
89 dev->rx_fifo_depth = 32;
92 * Try to get SDA hold time and *CNT values from an ACPI method if
93 * it exists for both supported speed modes.
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);
100 return 0;
103 static const struct acpi_device_id dw_i2c_acpi_match[] = {
104 { "INT33C2", 0 },
105 { "INT33C3", 0 },
106 { "80860F41", 0 },
109 MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match);
110 #else
111 static inline int dw_i2c_acpi_configure(struct platform_device *pdev)
113 return -ENODEV;
115 #endif
117 static int dw_i2c_probe(struct platform_device *pdev)
119 struct dw_i2c_dev *dev;
120 struct i2c_adapter *adap;
121 struct resource *mem;
122 int irq, r;
124 irq = platform_get_irq(pdev, 0);
125 if (irq < 0) {
126 dev_err(&pdev->dev, "no irq resource?\n");
127 return irq; /* -ENXIO */
130 dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
131 if (!dev)
132 return -ENOMEM;
134 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
135 dev->base = devm_ioremap_resource(&pdev->dev, mem);
136 if (IS_ERR(dev->base))
137 return PTR_ERR(dev->base);
139 init_completion(&dev->cmd_complete);
140 mutex_init(&dev->lock);
141 dev->dev = &pdev->dev;
142 dev->irq = irq;
143 platform_set_drvdata(pdev, dev);
145 dev->clk = devm_clk_get(&pdev->dev, NULL);
146 dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
148 if (IS_ERR(dev->clk))
149 return PTR_ERR(dev->clk);
150 clk_prepare_enable(dev->clk);
152 if (pdev->dev.of_node) {
153 u32 ht = 0;
154 u32 ic_clk = dev->get_clk_rate_khz(dev);
156 of_property_read_u32(pdev->dev.of_node,
157 "i2c-sda-hold-time-ns", &ht);
158 dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000,
159 1000000);
162 dev->functionality =
163 I2C_FUNC_I2C |
164 I2C_FUNC_10BIT_ADDR |
165 I2C_FUNC_SMBUS_BYTE |
166 I2C_FUNC_SMBUS_BYTE_DATA |
167 I2C_FUNC_SMBUS_WORD_DATA |
168 I2C_FUNC_SMBUS_I2C_BLOCK;
169 dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
170 DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST;
172 /* Try first if we can configure the device from ACPI */
173 r = dw_i2c_acpi_configure(pdev);
174 if (r) {
175 u32 param1 = i2c_dw_read_comp_param(dev);
177 dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;
178 dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1;
179 dev->adapter.nr = pdev->id;
181 r = i2c_dw_init(dev);
182 if (r)
183 return r;
185 i2c_dw_disable_int(dev);
186 r = devm_request_irq(&pdev->dev, dev->irq, i2c_dw_isr, IRQF_SHARED,
187 pdev->name, dev);
188 if (r) {
189 dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
190 return r;
193 adap = &dev->adapter;
194 i2c_set_adapdata(adap, dev);
195 adap->owner = THIS_MODULE;
196 adap->class = I2C_CLASS_HWMON;
197 strlcpy(adap->name, "Synopsys DesignWare I2C adapter",
198 sizeof(adap->name));
199 adap->algo = &i2c_dw_algo;
200 adap->dev.parent = &pdev->dev;
201 adap->dev.of_node = pdev->dev.of_node;
203 r = i2c_add_numbered_adapter(adap);
204 if (r) {
205 dev_err(&pdev->dev, "failure adding adapter\n");
206 return r;
209 pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
210 pm_runtime_use_autosuspend(&pdev->dev);
211 pm_runtime_set_active(&pdev->dev);
212 pm_runtime_enable(&pdev->dev);
214 return 0;
217 static int dw_i2c_remove(struct platform_device *pdev)
219 struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
221 pm_runtime_get_sync(&pdev->dev);
223 i2c_del_adapter(&dev->adapter);
225 i2c_dw_disable(dev);
227 pm_runtime_put(&pdev->dev);
228 pm_runtime_disable(&pdev->dev);
230 return 0;
233 #ifdef CONFIG_OF
234 static const struct of_device_id dw_i2c_of_match[] = {
235 { .compatible = "snps,designware-i2c", },
238 MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
239 #endif
241 #ifdef CONFIG_PM_SLEEP
242 static int dw_i2c_suspend(struct device *dev)
244 struct platform_device *pdev = to_platform_device(dev);
245 struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
247 clk_disable_unprepare(i_dev->clk);
249 return 0;
252 static int dw_i2c_resume(struct device *dev)
254 struct platform_device *pdev = to_platform_device(dev);
255 struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
257 clk_prepare_enable(i_dev->clk);
258 i2c_dw_init(i_dev);
260 return 0;
263 static SIMPLE_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend, dw_i2c_resume);
264 #define DW_I2C_DEV_PM_OPS (&dw_i2c_dev_pm_ops)
265 #else
266 #define DW_I2C_DEV_PM_OPS NULL
267 #endif
269 /* work with hotplug and coldplug */
270 MODULE_ALIAS("platform:i2c_designware");
272 static struct platform_driver dw_i2c_driver = {
273 .probe = dw_i2c_probe,
274 .remove = dw_i2c_remove,
275 .driver = {
276 .name = "i2c_designware",
277 .owner = THIS_MODULE,
278 .of_match_table = of_match_ptr(dw_i2c_of_match),
279 .acpi_match_table = ACPI_PTR(dw_i2c_acpi_match),
280 .pm = DW_I2C_DEV_PM_OPS,
284 static int __init dw_i2c_init_driver(void)
286 return platform_driver_register(&dw_i2c_driver);
288 subsys_initcall(dw_i2c_init_driver);
290 static void __exit dw_i2c_exit_driver(void)
292 platform_driver_unregister(&dw_i2c_driver);
294 module_exit(dw_i2c_exit_driver);
296 MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
297 MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter");
298 MODULE_LICENSE("GPL");