xref: /linux/drivers/regulator/mt6316-regulator.c (revision b61104e7a6349bd2c2b3e2fb3260d87f15eda8f4)
1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Copyright (c) 2024 MediaTek Inc.
4 // Copyright (c) 2025 Collabora Ltd
5 //                    AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
6 
7 #include <linux/module.h>
8 #include <linux/of.h>
9 #include <linux/regmap.h>
10 #include <linux/spmi.h>
11 
12 #include <linux/regulator/driver.h>
13 #include <linux/regulator/machine.h>
14 #include <linux/regulator/of_regulator.h>
15 
16 #define MT6316_BUCK_MODE_AUTO			0
17 #define MT6316_BUCK_MODE_FORCE_PWM		1
18 #define MT6316_BUCK_MODE_LP			2
19 
20 #define MT6316_CHIP_ID				0x20b
21 #define MT6316_BUCK_TOP_CON0			0x1440
22 #define EN_SET_OFFSET				0x1
23 #define EN_CLR_OFFSET				0x2
24 
25 #define MT6316_BUCK_TOP_CON1			0x1443
26 
27 #define MT6316_BUCK_TOP_ELR0			0x1448
28 #define MT6316_BUCK_TOP_ELR2			0x144a
29 #define MT6316_BUCK_TOP_ELR4			0x144c
30 #define MT6316_BUCK_TOP_ELR6			0x144e
31 #define MT6316_VSEL_MASK			GENMASK(8, 0)
32 
33 #define MT6316_VBUCK1_DBG			0x14a8
34 #define MT6316_VBUCK2_DBG			0x1528
35 #define MT6316_VBUCK3_DBG			0x15a8
36 #define MT6316_VBUCK4_DBG			0x1628
37 #define MT6316_BUCK_QI				BIT(0)
38 
39 #define MT6316_BUCK_TOP_4PHASE_TOP_ANA_CON0	0x1688
40 #define MT6316_BUCK_TOP_4PHASE_TOP_ELR_0	0x1690
41 
42 enum mt6316_type {
43 	MT6316_TYPE_2PHASE,
44 	MT6316_TYPE_3PHASE,
45 	MT6316_TYPE_4PHASE
46 };
47 
48 /**
49  * struct mt6316_regulator_info - MT6316 regulators information
50  * @desc: Regulator description structure
51  * @debug_reg: Debug register for regulator status
52  * @lp_mode_reg: Low Power mode register (normal/idle)
53  * @lp_mode_mask: Low Power mode regulator mask
54  * @modeset_reg: AUTO/PWM mode register
55  * @modeset_mask: AUTO/PWM regulator mask
56  */
57 struct mt6316_regulator_info {
58 	struct regulator_desc desc;
59 	u16 debug_reg;
60 	u16 lp_mode_reg;
61 	u16 lp_mode_mask;
62 	u16 modeset_reg;
63 	u16 modeset_mask;
64 };
65 
66 #define MT6316_BUCK(match, vreg_id, min, max, step, vs_reg)		\
67 {									\
68 	.desc = {							\
69 		.name = match,						\
70 		.of_match = of_match_ptr(match),			\
71 		.ops = &mt6316_vreg_setclr_ops,				\
72 		.type = REGULATOR_VOLTAGE,				\
73 		.owner = THIS_MODULE,					\
74 		.n_voltages = (max - min) / step + 1,			\
75 		.min_uV = min,						\
76 		.uV_step = step,					\
77 		.enable_reg = MT6316_BUCK_TOP_CON0,			\
78 		.enable_mask = BIT(vreg_id - 1),			\
79 		.vsel_reg = vs_reg,					\
80 		.vsel_mask = MT6316_VSEL_MASK,				\
81 		.of_map_mode = mt6316_map_mode,				\
82 	},								\
83 	.lp_mode_reg = MT6316_BUCK_TOP_CON1,				\
84 	.lp_mode_mask = BIT(vreg_id - 1),				\
85 	.modeset_reg = MT6316_BUCK_TOP_4PHASE_TOP_ANA_CON0,		\
86 	.modeset_mask = BIT(vreg_id - 1),				\
87 	.debug_reg = MT6316_VBUCK##vreg_id##_DBG,			\
88 }
89 
90 /* Values in some MT6316 registers are big endian, 9 bits long... */
91 static inline u16 mt6316_be9_to_cpu(u16 val)
92 {
93 	return ((val >> 8) & BIT(0)) | ((val & GENMASK(7, 0)) << 1);
94 }
95 
96 static inline u16 mt6316_cpu_to_be9(u16 val)
97 {
98 	return ((val & BIT(0)) << 8) | (val >> 1);
99 }
100 
101 static unsigned int mt6316_map_mode(u32 mode)
102 {
103 	switch (mode) {
104 	case MT6316_BUCK_MODE_AUTO:
105 		return REGULATOR_MODE_NORMAL;
106 	case MT6316_BUCK_MODE_FORCE_PWM:
107 		return REGULATOR_MODE_FAST;
108 	case MT6316_BUCK_MODE_LP:
109 		return REGULATOR_MODE_IDLE;
110 	default:
111 		return REGULATOR_MODE_INVALID;
112 	}
113 }
114 
115 static int mt6316_vreg_enable_setclr(struct regulator_dev *rdev)
116 {
117 	return regmap_write(rdev->regmap, rdev->desc->enable_reg + EN_SET_OFFSET,
118 			    rdev->desc->enable_mask);
119 }
120 
121 static int mt6316_vreg_disable_setclr(struct regulator_dev *rdev)
122 {
123 	return regmap_write(rdev->regmap, rdev->desc->enable_reg + EN_CLR_OFFSET,
124 			    rdev->desc->enable_mask);
125 }
126 
127 static int mt6316_regulator_set_voltage_sel(struct regulator_dev *rdev, unsigned int selector)
128 {
129 	u16 val = mt6316_cpu_to_be9(selector);
130 
131 	return regmap_bulk_write(rdev->regmap, rdev->desc->vsel_reg, &val, sizeof(val));
132 }
133 
134 static int mt6316_regulator_get_voltage_sel(struct regulator_dev *rdev)
135 {
136 	u16 val;
137 	int ret;
138 
139 	ret = regmap_bulk_read(rdev->regmap, rdev->desc->vsel_reg, &val, sizeof(val));
140 	if (ret)
141 		return ret;
142 
143 	return mt6316_be9_to_cpu(val & rdev->desc->vsel_mask);
144 }
145 
146 static int mt6316_regulator_get_status(struct regulator_dev *rdev)
147 {
148 	struct mt6316_regulator_info *info = rdev_get_drvdata(rdev);
149 	u32 val;
150 	int ret;
151 
152 	ret = regmap_read(rdev->regmap, info->debug_reg, &val);
153 	if (ret)
154 		return ret;
155 
156 	return val & MT6316_BUCK_QI ? REGULATOR_STATUS_ON : REGULATOR_STATUS_OFF;
157 }
158 
159 static unsigned int mt6316_regulator_get_mode(struct regulator_dev *rdev)
160 {
161 	struct mt6316_regulator_info *info = rdev_get_drvdata(rdev);
162 	unsigned int val;
163 	int ret;
164 
165 	ret = regmap_read(rdev->regmap, info->modeset_reg, &val);
166 	if (ret) {
167 		dev_err(&rdev->dev, "Failed to get mode: %d\n", ret);
168 		return ret;
169 	}
170 
171 	if ((val & info->modeset_mask) == info->modeset_mask)
172 		return REGULATOR_MODE_FAST;
173 
174 	ret = regmap_read(rdev->regmap, info->lp_mode_reg, &val);
175 	val &= info->lp_mode_mask;
176 	if (ret) {
177 		dev_err(&rdev->dev, "Failed to get lp mode: %d\n", ret);
178 		return ret;
179 	}
180 
181 	return val ? REGULATOR_MODE_IDLE : REGULATOR_MODE_NORMAL;
182 }
183 
184 static int mt6316_regulator_set_mode(struct regulator_dev *rdev,
185 				     unsigned int mode)
186 {
187 	struct mt6316_regulator_info *info = rdev_get_drvdata(rdev);
188 	struct regmap *regmap = rdev->regmap;
189 	int cur_mode, ret;
190 
191 	switch (mode) {
192 	case REGULATOR_MODE_FAST:
193 		ret = regmap_set_bits(regmap, info->modeset_reg, info->modeset_mask);
194 		break;
195 	case REGULATOR_MODE_NORMAL:
196 		cur_mode = mt6316_regulator_get_mode(rdev);
197 		if (cur_mode < 0) {
198 			ret = cur_mode;
199 			break;
200 		}
201 
202 		if (cur_mode == REGULATOR_MODE_FAST) {
203 			ret = regmap_clear_bits(regmap, info->modeset_reg, info->modeset_mask);
204 			break;
205 		} else if (cur_mode == REGULATOR_MODE_IDLE) {
206 			ret = regmap_clear_bits(regmap, info->lp_mode_reg, info->lp_mode_mask);
207 			if (ret == 0)
208 				usleep_range(100, 200);
209 		} else {
210 			ret = 0;
211 		}
212 		break;
213 	case REGULATOR_MODE_IDLE:
214 		ret = regmap_set_bits(regmap, info->lp_mode_reg, info->lp_mode_mask);
215 		break;
216 	default:
217 		ret = -EINVAL;
218 	}
219 
220 	if (ret) {
221 		dev_err(&rdev->dev, "Failed to set mode %u: %d\n", mode, ret);
222 		return ret;
223 	}
224 
225 	return 0;
226 }
227 
228 static const struct regulator_ops mt6316_vreg_setclr_ops = {
229 	.list_voltage = regulator_list_voltage_linear,
230 	.map_voltage = regulator_map_voltage_linear,
231 	.set_voltage_sel = mt6316_regulator_set_voltage_sel,
232 	.get_voltage_sel = mt6316_regulator_get_voltage_sel,
233 	.set_voltage_time_sel = regulator_set_voltage_time_sel,
234 	.enable = mt6316_vreg_enable_setclr,
235 	.disable = mt6316_vreg_disable_setclr,
236 	.is_enabled = regulator_is_enabled_regmap,
237 	.get_status = mt6316_regulator_get_status,
238 	.set_mode = mt6316_regulator_set_mode,
239 	.get_mode = mt6316_regulator_get_mode,
240 };
241 
242 /* MT6316BP/VP - 2+2 phase buck */
243 static struct mt6316_regulator_info mt6316bv_regulators[] = {
244 	MT6316_BUCK("vbuck12", 1, 0, 1277500, 2500, MT6316_BUCK_TOP_ELR0),
245 	MT6316_BUCK("vbuck34", 3, 0, 1277500, 2500, MT6316_BUCK_TOP_ELR4),
246 };
247 
248 /* MT6316CP/HP/KP - 3+1 phase buck */
249 static struct mt6316_regulator_info mt6316chk_regulators[] = {
250 	MT6316_BUCK("vbuck124", 1, 0, 1277500, 2500, MT6316_BUCK_TOP_ELR0),
251 	MT6316_BUCK("vbuck3", 3, 0, 1277500, 2500, MT6316_BUCK_TOP_ELR4),
252 };
253 
254 /* MT6316DP/TP - 4 phase buck */
255 static struct mt6316_regulator_info mt6316dt_regulators[] = {
256 	MT6316_BUCK("vbuck1234", 1, 0, 1277500, 2500, MT6316_BUCK_TOP_ELR0),
257 };
258 
259 static const struct regmap_config mt6316_spmi_regmap_config = {
260 	.reg_bits	= 16,
261 	.val_bits	= 8,
262 	.max_register	= 0x1700,
263 	.fast_io	= true,
264 };
265 
266 static int mt6316_regulator_probe(struct spmi_device *sdev)
267 {
268 	struct regulator_config config = {};
269 	struct mt6316_regulator_info *info;
270 	struct regulator_dev *rdev;
271 	enum mt6316_type type;
272 	int num_vregs, ret;
273 	unsigned int i;
274 	u32 chip_id;
275 
276 	config.regmap = devm_regmap_init_spmi_ext(sdev, &mt6316_spmi_regmap_config);
277 	if (IS_ERR(config.regmap))
278 		return PTR_ERR(config.regmap);
279 
280 	/*
281 	 * The first read is expected to fail: this PMIC needs to be woken up
282 	 * and that can be done with any activity over the SPMI bus.
283 	 */
284 	regmap_read(config.regmap, MT6316_CHIP_ID, &chip_id);
285 
286 	/* The second read, instead, shall not fail! */
287 	ret = regmap_read(config.regmap, MT6316_CHIP_ID, &chip_id);
288 	if (ret) {
289 		dev_err(&sdev->dev, "Cannot read Chip ID!\n");
290 		return ret;
291 	}
292 	dev_dbg(&sdev->dev, "Chip ID: 0x%x\n", chip_id);
293 
294 	config.dev = &sdev->dev;
295 
296 	type = (uintptr_t)device_get_match_data(&sdev->dev);
297 	switch (type) {
298 	case MT6316_TYPE_2PHASE:
299 		info = mt6316bv_regulators;
300 		num_vregs = ARRAY_SIZE(mt6316bv_regulators);
301 		break;
302 	case MT6316_TYPE_3PHASE:
303 		info = mt6316chk_regulators;
304 		num_vregs = ARRAY_SIZE(mt6316chk_regulators);
305 		break;
306 	case MT6316_TYPE_4PHASE:
307 		info = mt6316dt_regulators;
308 		num_vregs = ARRAY_SIZE(mt6316dt_regulators);
309 		break;
310 	default:
311 		return -EINVAL;
312 	}
313 
314 	for (i = 0; i < num_vregs; i++) {
315 		config.driver_data = &info[i];
316 
317 		rdev = devm_regulator_register(&sdev->dev, &info[i].desc, &config);
318 		if (IS_ERR(rdev))
319 			return dev_err_probe(&sdev->dev, PTR_ERR(rdev),
320 					     "failed to register %s\n", info[i].desc.name);
321 	}
322 
323 	return 0;
324 }
325 
326 static const struct of_device_id mt6316_regulator_match[] = {
327 	{ .compatible = "mediatek,mt6316b-regulator", .data = (void *)MT6316_TYPE_2PHASE },
328 	{ .compatible = "mediatek,mt6316c-regulator", .data = (void *)MT6316_TYPE_3PHASE },
329 	{ .compatible = "mediatek,mt6316d-regulator", .data = (void *)MT6316_TYPE_4PHASE },
330 	{ /* sentinel */ }
331 };
332 
333 static struct spmi_driver mt6316_regulator_driver = {
334 	.driver = {
335 		.name = "mt6316-regulator",
336 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
337 		.of_match_table = mt6316_regulator_match,
338 	},
339 	.probe = mt6316_regulator_probe,
340 };
341 module_spmi_driver(mt6316_regulator_driver);
342 
343 MODULE_AUTHOR("AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>");
344 MODULE_DESCRIPTION("Regulator Driver for MediaTek MT6316 PMIC");
345 MODULE_LICENSE("GPL");
346