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