1 /*
2 * Regulator driver for xz3216 DCDC chip for rk32xx
3 *
4 * Copyright (C) 2010, 2011 ROCKCHIP, Inc.
5
6 * Based on xz3216.c that is work by zhangqing<zhangqing@rock-chips.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 */
13
14 #include <linux/bug.h>
15 #include <linux/err.h>
16 #include <linux/i2c.h>
17 #include <linux/kernel.h>
18 #include <linux/regulator/driver.h>
19 #include <linux/delay.h>
20 #include <linux/slab.h>
21 #include <linux/mutex.h>
22 #include <linux/mfd/core.h>
23
24 #include <linux/interrupt.h>
25 #include <linux/module.h>
26 #include <linux/of_irq.h>
27 #include <linux/of_gpio.h>
28 #include <linux/of.h>
29 #include <linux/of_device.h>
30 #include <linux/regulator/of_regulator.h>
31 #include <linux/regulator/driver.h>
32 #include <linux/regulator/machine.h>
33 #include <linux/regmap.h>
34
35 #if 0
36 #define DBG(x...) pr_info(x)
37 #else
38 #define DBG(x...)
39 #endif
40
41 #define DBG_ERR(x...) pr_err(x)
42
43 #define XZ3216_NUM_REGULATORS 1
44
45 #define XZ3216_BUCK1_SET_VOL_BASE 0x00
46 #define XZ3216_BUCK1_SLP_VOL_BASE 0x01
47 #define XZ3216_CONTR_REG1 0x02
48 #define XZ3216_ID1_REG 0x03
49 #define BUCK_VOL_MASK 0x3f
50 #define VOL_MIN_IDX 0x00
51 #define VOL_MAX_IDX 0x3
52
53 /* VSEL bit definitions */
54 #define VSEL_BUCK_EN BIT(7)
55 #define VSEL_MODE BIT(6)
56 #define VSEL_NSEL_MASK 0x3F
57
58 /* Control bit definitions */
59 #define CTL_OUTPUT_DISCHG BIT(7)
60 #define CTL_SLEW_MASK (0x7 << 4)
61 #define CTL_SLEW_SHIFT 4
62 #define CTL_RESET BIT(2)
63
64 struct xz3216 {
65 struct device *dev;
66 struct i2c_client *i2c;
67 int num_regulators;
68 struct regulator_dev *rdev;
69 struct regulator_init_data *regulator;
70 struct regmap *regmap;
71 /* Voltage setting register */
72 unsigned int vol_reg;
73 unsigned int sleep_reg;
74 /* Voltage range and step(linear) */
75 unsigned int vsel_min;
76 unsigned int vsel_step;
77 unsigned int sleep_vol_cache;
78 };
79
80 struct xz3216_regulator {
81 struct device *dev;
82 struct regulator_desc *desc;
83 struct regulator_dev *rdev;
84 };
85
86 struct xz3216_board {
87 struct regulator_init_data *xz3216_init_data;
88 struct device_node *of_node;
89 };
90
xz3216_dcdc_get_mode(struct regulator_dev * dev)91 static unsigned int xz3216_dcdc_get_mode(struct regulator_dev *dev)
92 {
93 struct xz3216 *xz3216 = rdev_get_drvdata(dev);
94 unsigned int val;
95 int ret = 0;
96
97 ret = regmap_read(xz3216->regmap, xz3216->vol_reg, &val);
98 if (ret < 0)
99 return ret;
100 if (val & VSEL_MODE)
101 return REGULATOR_MODE_FAST;
102 else
103 return REGULATOR_MODE_NORMAL;
104 }
105
xz3216_dcdc_set_mode(struct regulator_dev * dev,unsigned int mode)106 static int xz3216_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
107 {
108 struct xz3216 *xz3216 = rdev_get_drvdata(dev);
109
110 switch (mode) {
111 case REGULATOR_MODE_FAST:
112 return regmap_update_bits(xz3216->regmap, xz3216->vol_reg,
113 VSEL_MODE, VSEL_MODE);
114 case REGULATOR_MODE_NORMAL:
115 return regmap_update_bits(xz3216->regmap, xz3216->vol_reg,
116 VSEL_MODE, 0);
117 default:
118 DBG("error:dcdc_xz3216 only auto and pwm mode\n");
119 return -EINVAL;
120 }
121 }
122
xz3216_dcdc_suspend_enable(struct regulator_dev * dev)123 static int xz3216_dcdc_suspend_enable(struct regulator_dev *dev)
124 {
125 struct xz3216 *xz3216 = rdev_get_drvdata(dev);
126 return regmap_update_bits(xz3216->regmap, XZ3216_BUCK1_SLP_VOL_BASE,
127 VSEL_BUCK_EN, VSEL_BUCK_EN);
128 }
129
xz3216_dcdc_suspend_disable(struct regulator_dev * dev)130 static int xz3216_dcdc_suspend_disable(struct regulator_dev *dev)
131 {
132 struct xz3216 *xz3216 = rdev_get_drvdata(dev);
133 return regmap_update_bits(xz3216->regmap, XZ3216_BUCK1_SLP_VOL_BASE,
134 VSEL_BUCK_EN, 0);
135
136 }
137
xz3216_dcdc_set_sleep_voltage(struct regulator_dev * dev,int uV)138 static int xz3216_dcdc_set_sleep_voltage(struct regulator_dev *dev,
139 int uV)
140 {
141 struct xz3216 *xz3216 = rdev_get_drvdata(dev);
142 int ret;
143
144 if (xz3216->sleep_vol_cache == uV)
145 return 0;
146 ret = regulator_map_voltage_linear(dev, uV, uV);
147 if (ret < 0)
148 return ret;
149 ret = regmap_update_bits(xz3216->regmap, XZ3216_BUCK1_SLP_VOL_BASE,
150 VSEL_NSEL_MASK, ret);
151 if (ret < 0)
152 return ret;
153 xz3216->sleep_vol_cache = uV;
154 return 0;
155
156 }
157
xz3216_dcdc_set_suspend_mode(struct regulator_dev * dev,unsigned int mode)158 static int xz3216_dcdc_set_suspend_mode(struct regulator_dev *dev,
159 unsigned int mode)
160 {
161 struct xz3216 *xz3216 = rdev_get_drvdata(dev);
162
163 switch (mode) {
164 case REGULATOR_MODE_FAST:
165 return regmap_update_bits(xz3216->regmap, xz3216->vol_reg,
166 VSEL_MODE, VSEL_MODE);
167 case REGULATOR_MODE_NORMAL:
168 return regmap_update_bits(xz3216->regmap, xz3216->vol_reg,
169 VSEL_MODE, 0);
170 default:
171 DBG_ERR("error:dcdc_xz3216 only auto and pwm mode\n");
172 return -EINVAL;
173 }
174 }
175
176 static const int slew_rates[] = {
177 64000,
178 32000,
179 16000,
180 8000,
181 4000,
182 2000,
183 1000,
184 500,
185 };
186
xz3216_set_ramp(struct regulator_dev * rdev,int ramp)187 static int xz3216_set_ramp(struct regulator_dev *rdev, int ramp)
188 {
189 struct xz3216 *xz3216 = rdev_get_drvdata(rdev);
190 int regval = -1, i;
191
192 for (i = 0; i < ARRAY_SIZE(slew_rates); i++) {
193 if (ramp <= slew_rates[i])
194 regval = i;
195 else
196 break;
197 }
198 if (regval < 0) {
199 dev_err(xz3216->dev, "unsupported ramp value %d\n", ramp);
200 return -EINVAL;
201 }
202
203 return regmap_update_bits(xz3216->regmap, XZ3216_CONTR_REG1,
204 CTL_SLEW_MASK, regval << CTL_SLEW_SHIFT);
205 }
206
207 static struct regulator_ops xz3216_dcdc_ops = {
208 .set_voltage_sel = regulator_set_voltage_sel_regmap,
209 .get_voltage_sel = regulator_get_voltage_sel_regmap,
210 .list_voltage = regulator_list_voltage_linear,
211 .map_voltage = regulator_map_voltage_linear,
212 .is_enabled = regulator_is_enabled_regmap,
213 .enable = regulator_enable_regmap,
214 .disable = regulator_disable_regmap,
215 .get_mode = xz3216_dcdc_get_mode,
216 .set_mode = xz3216_dcdc_set_mode,
217 .set_suspend_voltage = xz3216_dcdc_set_sleep_voltage,
218 .set_suspend_enable = xz3216_dcdc_suspend_enable,
219 .set_suspend_disable = xz3216_dcdc_suspend_disable,
220 .set_suspend_mode = xz3216_dcdc_set_suspend_mode,
221 .set_ramp_delay = xz3216_set_ramp,
222 .set_voltage_time_sel = regulator_set_voltage_time_sel,
223 };
224
225 static struct regulator_desc regulators[] = {
226 {
227 .name = "XZ_DCDC1",
228 .supply_name = "vin",
229 .id = 0,
230 .ops = &xz3216_dcdc_ops,
231 .n_voltages = 64,
232 .type = REGULATOR_VOLTAGE,
233 .enable_time = 400,
234 .enable_reg = XZ3216_BUCK1_SET_VOL_BASE,
235 .enable_mask = VSEL_BUCK_EN,
236 .min_uV = 600000,
237 .uV_step = 12500,
238 .vsel_reg = XZ3216_BUCK1_SET_VOL_BASE,
239 .vsel_mask = VSEL_NSEL_MASK,
240 .owner = THIS_MODULE,
241 },
242 };
243
244 static const struct regmap_config xz3216_regmap_config = {
245 .reg_bits = 8,
246 .val_bits = 8,
247 };
248
249 #ifdef CONFIG_OF
250 static struct of_device_id xz3216_of_match[] = {
251 { .compatible = "xz3216"},
252 { },
253 };
254 MODULE_DEVICE_TABLE(of, xz3216_of_match);
255 #endif
256
257 #ifdef CONFIG_OF
258 static struct of_regulator_match xz3216_reg_matches[] = {
259 { .name = "xz_dcdc1", .driver_data = (void *)0},
260 };
261
xz3216_parse_dt(struct xz3216 * xz3216)262 static struct xz3216_board *xz3216_parse_dt(struct xz3216 *xz3216)
263 {
264 struct xz3216_board *pdata;
265 struct device_node *regs;
266 struct device_node *xz3216_np;
267 int count;
268
269 xz3216_np = of_node_get(xz3216->dev->of_node);
270 if (!xz3216_np) {
271 DBG_ERR("could not find pmic sub-node\n");
272 return NULL;
273 }
274 regs = of_find_node_by_name(xz3216_np, "regulators");
275 if (!regs)
276 return NULL;
277 count = of_regulator_match(xz3216->dev, regs, xz3216_reg_matches,
278 XZ3216_NUM_REGULATORS);
279 of_node_put(regs);
280 pdata = devm_kzalloc(xz3216->dev, sizeof(*pdata), GFP_KERNEL);
281 if (!pdata)
282 return NULL;
283 pdata->xz3216_init_data = xz3216_reg_matches[0].init_data;
284 pdata->of_node = xz3216_reg_matches[0].of_node;
285 return pdata;
286 }
287
288 #else
xz3216_parse_dt(struct i2c_client * i2c)289 static struct xz3216_board *xz3216_parse_dt(struct i2c_client *i2c)
290 {
291 return NULL;
292 }
293 #endif
294
xz3216_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)295 static int xz3216_i2c_probe(struct i2c_client *i2c,
296 const struct i2c_device_id *id)
297 {
298 struct xz3216 *xz3216;
299 struct xz3216_board *pdev;
300 const struct of_device_id *match;
301 struct regulator_config config = { };
302 int ret;
303 DBG("%s, line=%d\n", __func__, __LINE__);
304 xz3216 = devm_kzalloc(&i2c->dev, sizeof(struct xz3216),
305 GFP_KERNEL);
306 if (!xz3216) {
307 ret = -ENOMEM;
308 goto err;
309 }
310
311 if (i2c->dev.of_node) {
312 match = of_match_device(xz3216_of_match, &i2c->dev);
313 if (!match) {
314 DBG_ERR("Failed to find matching dt id\n");
315 return -EINVAL;
316 }
317 }
318
319 xz3216->regmap = devm_regmap_init_i2c(i2c, &xz3216_regmap_config);
320 if (IS_ERR(xz3216->regmap)) {
321 dev_err(&i2c->dev, "Failed to allocate regmap!\n");
322 return PTR_ERR(xz3216->regmap);
323 }
324
325 xz3216->i2c = i2c;
326 xz3216->dev = &i2c->dev;
327 i2c_set_clientdata(i2c, xz3216);
328 pdev = dev_get_platdata(&i2c->dev);
329 if (!pdev)
330 pdev = xz3216_parse_dt(xz3216);
331 if (pdev) {
332 xz3216->num_regulators = XZ3216_NUM_REGULATORS;
333 xz3216->rdev = kcalloc(XZ3216_NUM_REGULATORS,
334 sizeof(struct regulator_dev),
335 GFP_KERNEL);
336 if (!xz3216->rdev)
337 return -ENOMEM;
338 /* Instantiate the regulators */
339 xz3216->regulator = pdev->xz3216_init_data;
340 if (xz3216->dev->of_node)
341 config.of_node = pdev->of_node;
342 config.dev = xz3216->dev;
343 config.driver_data = xz3216;
344 config.init_data = xz3216->regulator;
345 xz3216->rdev = devm_regulator_register(xz3216->dev,
346 ®ulators[0], &config);
347 ret = PTR_ERR_OR_ZERO(xz3216->rdev);
348 if (ret < 0)
349 dev_err(&i2c->dev, "Failed to register regulator!\n");
350 return ret;
351 }
352 return 0;
353 err:
354 return ret;
355 }
356
xz3216_i2c_remove(struct i2c_client * i2c)357 static int xz3216_i2c_remove(struct i2c_client *i2c)
358 {
359 struct xz3216 *xz3216 = i2c_get_clientdata(i2c);
360
361 if (xz3216->rdev)
362 regulator_unregister(xz3216->rdev);
363 i2c_set_clientdata(i2c, NULL);
364 return 0;
365 }
366
367 static const struct i2c_device_id xz3216_i2c_id[] = {
368 { "xz3216", 0 },
369 { }
370 };
371
372 MODULE_DEVICE_TABLE(i2c, xz3216_i2c_id);
373
374 static struct i2c_driver xz3216_i2c_driver = {
375 .driver = {
376 .name = "xz3216",
377 .owner = THIS_MODULE,
378 .of_match_table = of_match_ptr(xz3216_of_match),
379 },
380 .probe = xz3216_i2c_probe,
381 .remove = xz3216_i2c_remove,
382 .id_table = xz3216_i2c_id,
383 };
384
xz3216_module_init(void)385 static int __init xz3216_module_init(void)
386 {
387 int ret;
388
389 ret = i2c_add_driver(&xz3216_i2c_driver);
390 if (ret != 0)
391 pr_err("Failed to register I2C driver: %d\n", ret);
392 return ret;
393 }
394 subsys_initcall_sync(xz3216_module_init);
395
xz3216_module_exit(void)396 static void __exit xz3216_module_exit(void)
397 {
398 i2c_del_driver(&xz3216_i2c_driver);
399 }
400 module_exit(xz3216_module_exit);
401
402 MODULE_LICENSE("GPL");
403 MODULE_AUTHOR("zhangqing <zhangqing@rock-chips.com>");
404 MODULE_DESCRIPTION("xz3216 PMIC driver");
405