net: mscc: ocelot: cross-check the sequence id from the timestamp FIFO with the skb...
[linux-2.6-microblaze.git] / drivers / mfd / tps65218.c
1 /*
2  * Driver for TPS65218 Integrated power management chipsets
3  *
4  * Copyright (C) 2014 Texas Instruments Incorporated - https://www.ti.com/
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  *
10  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
11  * kind, whether expressed or implied; without even the implied warranty
12  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License version 2 for more details.
14  */
15
16 #include <linux/kernel.h>
17 #include <linux/device.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/init.h>
21 #include <linux/i2c.h>
22 #include <linux/slab.h>
23 #include <linux/regmap.h>
24 #include <linux/err.h>
25 #include <linux/of.h>
26 #include <linux/of_device.h>
27 #include <linux/irq.h>
28 #include <linux/interrupt.h>
29 #include <linux/mutex.h>
30
31 #include <linux/mfd/core.h>
32 #include <linux/mfd/tps65218.h>
33
34 #define TPS65218_PASSWORD_REGS_UNLOCK   0x7D
35
36 static const struct mfd_cell tps65218_cells[] = {
37         {
38                 .name = "tps65218-pwrbutton",
39                 .of_compatible = "ti,tps65218-pwrbutton",
40         },
41         {
42                 .name = "tps65218-gpio",
43                 .of_compatible = "ti,tps65218-gpio",
44         },
45         { .name = "tps65218-regulator", },
46 };
47
48 /**
49  * tps65218_reg_write: Write a single tps65218 register.
50  *
51  * @tps: Device to write to.
52  * @reg: Register to write to.
53  * @val: Value to write.
54  * @level: Password protected level
55  */
56 int tps65218_reg_write(struct tps65218 *tps, unsigned int reg,
57                         unsigned int val, unsigned int level)
58 {
59         int ret;
60         unsigned int xor_reg_val;
61
62         switch (level) {
63         case TPS65218_PROTECT_NONE:
64                 return regmap_write(tps->regmap, reg, val);
65         case TPS65218_PROTECT_L1:
66                 xor_reg_val = reg ^ TPS65218_PASSWORD_REGS_UNLOCK;
67                 ret = regmap_write(tps->regmap, TPS65218_REG_PASSWORD,
68                                                         xor_reg_val);
69                 if (ret < 0)
70                         return ret;
71
72                 return regmap_write(tps->regmap, reg, val);
73         default:
74                 return -EINVAL;
75         }
76 }
77 EXPORT_SYMBOL_GPL(tps65218_reg_write);
78
79 /**
80  * tps65218_update_bits: Modify bits w.r.t mask, val and level.
81  *
82  * @tps: Device to write to.
83  * @reg: Register to read-write to.
84  * @mask: Mask.
85  * @val: Value to write.
86  * @level: Password protected level
87  */
88 static int tps65218_update_bits(struct tps65218 *tps, unsigned int reg,
89                 unsigned int mask, unsigned int val, unsigned int level)
90 {
91         int ret;
92         unsigned int data;
93
94         ret = regmap_read(tps->regmap, reg, &data);
95         if (ret) {
96                 dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
97                 return ret;
98         }
99
100         data &= ~mask;
101         data |= val & mask;
102
103         mutex_lock(&tps->tps_lock);
104         ret = tps65218_reg_write(tps, reg, data, level);
105         if (ret)
106                 dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
107         mutex_unlock(&tps->tps_lock);
108
109         return ret;
110 }
111
112 int tps65218_set_bits(struct tps65218 *tps, unsigned int reg,
113                 unsigned int mask, unsigned int val, unsigned int level)
114 {
115         return tps65218_update_bits(tps, reg, mask, val, level);
116 }
117 EXPORT_SYMBOL_GPL(tps65218_set_bits);
118
119 int tps65218_clear_bits(struct tps65218 *tps, unsigned int reg,
120                 unsigned int mask, unsigned int level)
121 {
122         return tps65218_update_bits(tps, reg, mask, 0, level);
123 }
124 EXPORT_SYMBOL_GPL(tps65218_clear_bits);
125
126 static const struct regmap_range tps65218_yes_ranges[] = {
127         regmap_reg_range(TPS65218_REG_INT1, TPS65218_REG_INT2),
128         regmap_reg_range(TPS65218_REG_STATUS, TPS65218_REG_STATUS),
129 };
130
131 static const struct regmap_access_table tps65218_volatile_table = {
132         .yes_ranges = tps65218_yes_ranges,
133         .n_yes_ranges = ARRAY_SIZE(tps65218_yes_ranges),
134 };
135
136 static const struct regmap_config tps65218_regmap_config = {
137         .reg_bits = 8,
138         .val_bits = 8,
139         .cache_type = REGCACHE_RBTREE,
140         .volatile_table = &tps65218_volatile_table,
141 };
142
143 static const struct regmap_irq tps65218_irqs[] = {
144         /* INT1 IRQs */
145         [TPS65218_PRGC_IRQ] = {
146                 .mask = TPS65218_INT1_PRGC,
147         },
148         [TPS65218_CC_AQC_IRQ] = {
149                 .mask = TPS65218_INT1_CC_AQC,
150         },
151         [TPS65218_HOT_IRQ] = {
152                 .mask = TPS65218_INT1_HOT,
153         },
154         [TPS65218_PB_IRQ] = {
155                 .mask = TPS65218_INT1_PB,
156         },
157         [TPS65218_AC_IRQ] = {
158                 .mask = TPS65218_INT1_AC,
159         },
160         [TPS65218_VPRG_IRQ] = {
161                 .mask = TPS65218_INT1_VPRG,
162         },
163         [TPS65218_INVALID1_IRQ] = {
164         },
165         [TPS65218_INVALID2_IRQ] = {
166         },
167         /* INT2 IRQs*/
168         [TPS65218_LS1_I_IRQ] = {
169                 .mask = TPS65218_INT2_LS1_I,
170                 .reg_offset = 1,
171         },
172         [TPS65218_LS2_I_IRQ] = {
173                 .mask = TPS65218_INT2_LS2_I,
174                 .reg_offset = 1,
175         },
176         [TPS65218_LS3_I_IRQ] = {
177                 .mask = TPS65218_INT2_LS3_I,
178                 .reg_offset = 1,
179         },
180         [TPS65218_LS1_F_IRQ] = {
181                 .mask = TPS65218_INT2_LS1_F,
182                 .reg_offset = 1,
183         },
184         [TPS65218_LS2_F_IRQ] = {
185                 .mask = TPS65218_INT2_LS2_F,
186                 .reg_offset = 1,
187         },
188         [TPS65218_LS3_F_IRQ] = {
189                 .mask = TPS65218_INT2_LS3_F,
190                 .reg_offset = 1,
191         },
192         [TPS65218_INVALID3_IRQ] = {
193         },
194         [TPS65218_INVALID4_IRQ] = {
195         },
196 };
197
198 static struct regmap_irq_chip tps65218_irq_chip = {
199         .name = "tps65218",
200         .irqs = tps65218_irqs,
201         .num_irqs = ARRAY_SIZE(tps65218_irqs),
202
203         .num_regs = 2,
204         .mask_base = TPS65218_REG_INT_MASK1,
205         .status_base = TPS65218_REG_INT1,
206 };
207
208 static const struct of_device_id of_tps65218_match_table[] = {
209         { .compatible = "ti,tps65218", },
210         {}
211 };
212 MODULE_DEVICE_TABLE(of, of_tps65218_match_table);
213
214 static int tps65218_voltage_set_strict(struct tps65218 *tps)
215 {
216         u32 strict;
217
218         if (of_property_read_u32(tps->dev->of_node,
219                                  "ti,strict-supply-voltage-supervision",
220                                  &strict))
221                 return 0;
222
223         if (strict != 0 && strict != 1) {
224                 dev_err(tps->dev,
225                         "Invalid ti,strict-supply-voltage-supervision value\n");
226                 return -EINVAL;
227         }
228
229         tps65218_update_bits(tps, TPS65218_REG_CONFIG1,
230                              TPS65218_CONFIG1_STRICT,
231                              strict ? TPS65218_CONFIG1_STRICT : 0,
232                              TPS65218_PROTECT_L1);
233         return 0;
234 }
235
236 static int tps65218_voltage_set_uv_hyst(struct tps65218 *tps)
237 {
238         u32 hyst;
239
240         if (of_property_read_u32(tps->dev->of_node,
241                                  "ti,under-voltage-hyst-microvolt", &hyst))
242                 return 0;
243
244         if (hyst != 400000 && hyst != 200000) {
245                 dev_err(tps->dev,
246                         "Invalid ti,under-voltage-hyst-microvolt value\n");
247                 return -EINVAL;
248         }
249
250         tps65218_update_bits(tps, TPS65218_REG_CONFIG2,
251                              TPS65218_CONFIG2_UVLOHYS,
252                              hyst == 400000 ? TPS65218_CONFIG2_UVLOHYS : 0,
253                              TPS65218_PROTECT_L1);
254         return 0;
255 }
256
257 static int tps65218_voltage_set_uvlo(struct tps65218 *tps)
258 {
259         u32 uvlo;
260         int uvloval;
261
262         if (of_property_read_u32(tps->dev->of_node,
263                                  "ti,under-voltage-limit-microvolt", &uvlo))
264                 return 0;
265
266         switch (uvlo) {
267         case 2750000:
268                 uvloval = TPS65218_CONFIG1_UVLO_2750000;
269                 break;
270         case 2950000:
271                 uvloval = TPS65218_CONFIG1_UVLO_2950000;
272                 break;
273         case 3250000:
274                 uvloval = TPS65218_CONFIG1_UVLO_3250000;
275                 break;
276         case 3350000:
277                 uvloval = TPS65218_CONFIG1_UVLO_3350000;
278                 break;
279         default:
280                 dev_err(tps->dev,
281                         "Invalid ti,under-voltage-limit-microvolt value\n");
282                 return -EINVAL;
283         }
284
285         tps65218_update_bits(tps, TPS65218_REG_CONFIG1,
286                              TPS65218_CONFIG1_UVLO_MASK, uvloval,
287                              TPS65218_PROTECT_L1);
288         return 0;
289 }
290
291 static int tps65218_probe(struct i2c_client *client,
292                                 const struct i2c_device_id *ids)
293 {
294         struct tps65218 *tps;
295         int ret;
296         unsigned int chipid;
297
298         tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
299         if (!tps)
300                 return -ENOMEM;
301
302         i2c_set_clientdata(client, tps);
303         tps->dev = &client->dev;
304         tps->irq = client->irq;
305         tps->regmap = devm_regmap_init_i2c(client, &tps65218_regmap_config);
306         if (IS_ERR(tps->regmap)) {
307                 ret = PTR_ERR(tps->regmap);
308                 dev_err(tps->dev, "Failed to allocate register map: %d\n",
309                         ret);
310                 return ret;
311         }
312
313         mutex_init(&tps->tps_lock);
314
315         ret = devm_regmap_add_irq_chip(&client->dev, tps->regmap, tps->irq,
316                                        IRQF_ONESHOT, 0, &tps65218_irq_chip,
317                                        &tps->irq_data);
318         if (ret < 0)
319                 return ret;
320
321         ret = regmap_read(tps->regmap, TPS65218_REG_CHIPID, &chipid);
322         if (ret) {
323                 dev_err(tps->dev, "Failed to read chipid: %d\n", ret);
324                 return ret;
325         }
326
327         tps->rev = chipid & TPS65218_CHIPID_REV_MASK;
328
329         ret = tps65218_voltage_set_strict(tps);
330         if (ret)
331                 return ret;
332
333         ret = tps65218_voltage_set_uvlo(tps);
334         if (ret)
335                 return ret;
336
337         ret = tps65218_voltage_set_uv_hyst(tps);
338         if (ret)
339                 return ret;
340
341         ret = mfd_add_devices(tps->dev, PLATFORM_DEVID_AUTO, tps65218_cells,
342                               ARRAY_SIZE(tps65218_cells), NULL, 0,
343                               regmap_irq_get_domain(tps->irq_data));
344
345         return ret;
346 }
347
348 static const struct i2c_device_id tps65218_id_table[] = {
349         { "tps65218", TPS65218 },
350         { },
351 };
352 MODULE_DEVICE_TABLE(i2c, tps65218_id_table);
353
354 static struct i2c_driver tps65218_driver = {
355         .driver         = {
356                 .name   = "tps65218",
357                 .of_match_table = of_tps65218_match_table,
358         },
359         .probe          = tps65218_probe,
360         .id_table       = tps65218_id_table,
361 };
362
363 module_i2c_driver(tps65218_driver);
364
365 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
366 MODULE_DESCRIPTION("TPS65218 chip family multi-function driver");
367 MODULE_LICENSE("GPL v2");