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97fb5e8d | 1 | // SPDX-License-Identifier: GPL-2.0-only |
c3a973a7 JC |
2 | /* |
3 | * Copyright (c) 2014, The Linux Foundation. All rights reserved. | |
c3a973a7 JC |
4 | */ |
5 | ||
e9c11c6e CC |
6 | #include <linux/device.h> |
7 | #include <linux/errno.h> | |
8 | #include <linux/gfp.h> | |
c3a973a7 JC |
9 | #include <linux/kernel.h> |
10 | #include <linux/module.h> | |
11 | #include <linux/spmi.h> | |
e9c11c6e | 12 | #include <linux/types.h> |
c3a973a7 JC |
13 | #include <linux/regmap.h> |
14 | #include <linux/of_platform.h> | |
e9c11c6e | 15 | #include <soc/qcom/qcom-spmi-pmic.h> |
c3a973a7 | 16 | |
dc716bbf II |
17 | #define PMIC_REV2 0x101 |
18 | #define PMIC_REV3 0x102 | |
19 | #define PMIC_REV4 0x103 | |
20 | #define PMIC_TYPE 0x104 | |
21 | #define PMIC_SUBTYPE 0x105 | |
d23c3c08 | 22 | #define PMIC_FAB_ID 0x1f2 |
dc716bbf II |
23 | |
24 | #define PMIC_TYPE_VALUE 0x51 | |
25 | ||
e9c11c6e CC |
26 | #define PMIC_REV4_V2 0x02 |
27 | ||
28 | struct qcom_spmi_dev { | |
29 | int num_usids; | |
30 | struct qcom_spmi_pmic pmic; | |
31 | }; | |
32 | ||
33 | #define N_USIDS(n) ((void *)n) | |
dc716bbf II |
34 | |
35 | static const struct of_device_id pmic_spmi_id_table[] = { | |
e9c11c6e CC |
36 | { .compatible = "qcom,pm660", .data = N_USIDS(2) }, |
37 | { .compatible = "qcom,pm660l", .data = N_USIDS(2) }, | |
38 | { .compatible = "qcom,pm8004", .data = N_USIDS(2) }, | |
39 | { .compatible = "qcom,pm8005", .data = N_USIDS(2) }, | |
40 | { .compatible = "qcom,pm8019", .data = N_USIDS(2) }, | |
41 | { .compatible = "qcom,pm8028", .data = N_USIDS(2) }, | |
42 | { .compatible = "qcom,pm8110", .data = N_USIDS(2) }, | |
43 | { .compatible = "qcom,pm8150", .data = N_USIDS(2) }, | |
44 | { .compatible = "qcom,pm8150b", .data = N_USIDS(2) }, | |
45 | { .compatible = "qcom,pm8150c", .data = N_USIDS(2) }, | |
46 | { .compatible = "qcom,pm8150l", .data = N_USIDS(2) }, | |
47 | { .compatible = "qcom,pm8226", .data = N_USIDS(2) }, | |
48 | { .compatible = "qcom,pm8841", .data = N_USIDS(2) }, | |
49 | { .compatible = "qcom,pm8901", .data = N_USIDS(2) }, | |
50 | { .compatible = "qcom,pm8909", .data = N_USIDS(2) }, | |
51 | { .compatible = "qcom,pm8916", .data = N_USIDS(2) }, | |
52 | { .compatible = "qcom,pm8941", .data = N_USIDS(2) }, | |
53 | { .compatible = "qcom,pm8950", .data = N_USIDS(2) }, | |
54 | { .compatible = "qcom,pm8994", .data = N_USIDS(2) }, | |
55 | { .compatible = "qcom,pm8998", .data = N_USIDS(2) }, | |
56 | { .compatible = "qcom,pma8084", .data = N_USIDS(2) }, | |
57 | { .compatible = "qcom,pmd9635", .data = N_USIDS(2) }, | |
58 | { .compatible = "qcom,pmi8950", .data = N_USIDS(2) }, | |
59 | { .compatible = "qcom,pmi8962", .data = N_USIDS(2) }, | |
60 | { .compatible = "qcom,pmi8994", .data = N_USIDS(2) }, | |
61 | { .compatible = "qcom,pmi8998", .data = N_USIDS(2) }, | |
62 | { .compatible = "qcom,pmk8002", .data = N_USIDS(2) }, | |
90d7c403 | 63 | { .compatible = "qcom,pmp8074", .data = N_USIDS(2) }, |
e9c11c6e CC |
64 | { .compatible = "qcom,smb2351", .data = N_USIDS(2) }, |
65 | { .compatible = "qcom,spmi-pmic", .data = N_USIDS(1) }, | |
dc716bbf II |
66 | { } |
67 | }; | |
68 | ||
e9c11c6e CC |
69 | /* |
70 | * A PMIC can be represented by multiple SPMI devices, but | |
71 | * only the base PMIC device will contain a reference to | |
72 | * the revision information. | |
73 | * | |
74 | * This function takes a pointer to a pmic device and | |
75 | * returns a pointer to the base PMIC device. | |
76 | * | |
77 | * This only supports PMICs with 1 or 2 USIDs. | |
78 | */ | |
79 | static struct spmi_device *qcom_pmic_get_base_usid(struct device *dev) | |
dc716bbf | 80 | { |
e9c11c6e CC |
81 | struct spmi_device *sdev; |
82 | struct qcom_spmi_dev *ctx; | |
83 | struct device_node *spmi_bus; | |
84 | struct device_node *other_usid = NULL; | |
85 | int function_parent_usid, ret; | |
86 | u32 pmic_addr; | |
dc716bbf | 87 | |
e9c11c6e CC |
88 | sdev = to_spmi_device(dev); |
89 | ctx = dev_get_drvdata(&sdev->dev); | |
90 | ||
91 | /* | |
92 | * Quick return if the function device is already in the base | |
93 | * USID. This will always be hit for PMICs with only 1 USID. | |
94 | */ | |
95 | if (sdev->usid % ctx->num_usids == 0) | |
96 | return sdev; | |
dc716bbf | 97 | |
e9c11c6e CC |
98 | function_parent_usid = sdev->usid; |
99 | ||
100 | /* | |
101 | * Walk through the list of PMICs until we find the sibling USID. | |
102 | * The goal is to find the first USID which is less than the | |
103 | * number of USIDs in the PMIC array, e.g. for a PMIC with 2 USIDs | |
104 | * where the function device is under USID 3, we want to find the | |
105 | * device for USID 2. | |
106 | */ | |
107 | spmi_bus = of_get_parent(sdev->dev.of_node); | |
108 | do { | |
109 | other_usid = of_get_next_child(spmi_bus, other_usid); | |
110 | ||
111 | ret = of_property_read_u32_index(other_usid, "reg", 0, &pmic_addr); | |
112 | if (ret) | |
113 | return ERR_PTR(ret); | |
114 | ||
115 | sdev = spmi_device_from_of(other_usid); | |
116 | if (pmic_addr == function_parent_usid - (ctx->num_usids - 1)) { | |
117 | if (!sdev) | |
118 | /* | |
119 | * If the base USID for this PMIC hasn't probed yet | |
120 | * but the secondary USID has, then we need to defer | |
121 | * the function driver so that it will attempt to | |
122 | * probe again when the base USID is ready. | |
123 | */ | |
124 | return ERR_PTR(-EPROBE_DEFER); | |
125 | return sdev; | |
126 | } | |
127 | } while (other_usid->sibling); | |
128 | ||
129 | return ERR_PTR(-ENODATA); | |
130 | } | |
131 | ||
132 | static int pmic_spmi_load_revid(struct regmap *map, struct device *dev, | |
133 | struct qcom_spmi_pmic *pmic) | |
134 | { | |
135 | int ret; | |
dc716bbf | 136 | |
e9c11c6e | 137 | ret = regmap_read(map, PMIC_TYPE, &pmic->type); |
dc716bbf | 138 | if (ret < 0) |
e9c11c6e | 139 | return ret; |
dc716bbf | 140 | |
e9c11c6e CC |
141 | if (pmic->type != PMIC_TYPE_VALUE) |
142 | return ret; | |
143 | ||
144 | ret = regmap_read(map, PMIC_SUBTYPE, &pmic->subtype); | |
145 | if (ret < 0) | |
146 | return ret; | |
dc716bbf | 147 | |
e9c11c6e | 148 | pmic->name = of_match_device(pmic_spmi_id_table, dev)->compatible; |
dc716bbf | 149 | |
e9c11c6e | 150 | ret = regmap_read(map, PMIC_REV2, &pmic->rev2); |
dc716bbf | 151 | if (ret < 0) |
e9c11c6e | 152 | return ret; |
dc716bbf | 153 | |
e9c11c6e | 154 | ret = regmap_read(map, PMIC_REV3, &pmic->minor); |
dc716bbf | 155 | if (ret < 0) |
e9c11c6e | 156 | return ret; |
dc716bbf | 157 | |
e9c11c6e | 158 | ret = regmap_read(map, PMIC_REV4, &pmic->major); |
dc716bbf | 159 | if (ret < 0) |
e9c11c6e | 160 | return ret; |
dc716bbf | 161 | |
d23c3c08 CC |
162 | if (pmic->subtype == PMI8998_SUBTYPE || pmic->subtype == PM660_SUBTYPE) { |
163 | ret = regmap_read(map, PMIC_FAB_ID, &pmic->fab_id); | |
164 | if (ret < 0) | |
165 | return ret; | |
166 | } | |
167 | ||
dc716bbf II |
168 | /* |
169 | * In early versions of PM8941 and PM8226, the major revision number | |
170 | * started incrementing from 0 (eg 0 = v1.0, 1 = v2.0). | |
171 | * Increment the major revision number here if the chip is an early | |
172 | * version of PM8941 or PM8226. | |
173 | */ | |
e9c11c6e CC |
174 | if ((pmic->subtype == PM8941_SUBTYPE || pmic->subtype == PM8226_SUBTYPE) && |
175 | pmic->major < PMIC_REV4_V2) | |
176 | pmic->major++; | |
177 | ||
178 | if (pmic->subtype == PM8110_SUBTYPE) | |
179 | pmic->minor = pmic->rev2; | |
180 | ||
181 | dev_dbg(dev, "%x: %s v%d.%d\n", | |
182 | pmic->subtype, pmic->name, pmic->major, pmic->minor); | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | /** | |
188 | * qcom_pmic_get() - Get a pointer to the base PMIC device | |
189 | * | |
190 | * This function takes a struct device for a driver which is a child of a PMIC. | |
191 | * And locates the PMIC revision information for it. | |
192 | * | |
193 | * @dev: the pmic function device | |
194 | * @return: the struct qcom_spmi_pmic* pointer associated with the function device | |
195 | */ | |
196 | const struct qcom_spmi_pmic *qcom_pmic_get(struct device *dev) | |
197 | { | |
198 | struct spmi_device *sdev; | |
199 | struct qcom_spmi_dev *spmi; | |
200 | ||
201 | /* | |
202 | * Make sure the device is actually a child of a PMIC | |
203 | */ | |
204 | if (!of_match_device(pmic_spmi_id_table, dev->parent)) | |
205 | return ERR_PTR(-EINVAL); | |
206 | ||
207 | sdev = qcom_pmic_get_base_usid(dev->parent); | |
dc716bbf | 208 | |
e9c11c6e CC |
209 | if (IS_ERR(sdev)) |
210 | return ERR_CAST(sdev); | |
dc716bbf | 211 | |
e9c11c6e CC |
212 | spmi = dev_get_drvdata(&sdev->dev); |
213 | ||
214 | return &spmi->pmic; | |
dc716bbf | 215 | } |
e9c11c6e | 216 | EXPORT_SYMBOL(qcom_pmic_get); |
dc716bbf | 217 | |
c3a973a7 JC |
218 | static const struct regmap_config spmi_regmap_config = { |
219 | .reg_bits = 16, | |
220 | .val_bits = 8, | |
221 | .max_register = 0xffff, | |
222 | .fast_io = true, | |
223 | }; | |
224 | ||
225 | static int pmic_spmi_probe(struct spmi_device *sdev) | |
226 | { | |
c3a973a7 | 227 | struct regmap *regmap; |
e9c11c6e CC |
228 | struct qcom_spmi_dev *ctx; |
229 | int ret; | |
c3a973a7 JC |
230 | |
231 | regmap = devm_regmap_init_spmi_ext(sdev, &spmi_regmap_config); | |
232 | if (IS_ERR(regmap)) | |
233 | return PTR_ERR(regmap); | |
234 | ||
e9c11c6e CC |
235 | ctx = devm_kzalloc(&sdev->dev, sizeof(*ctx), GFP_KERNEL); |
236 | if (!ctx) | |
237 | return -ENOMEM; | |
238 | ||
239 | ctx->num_usids = (uintptr_t)of_device_get_match_data(&sdev->dev); | |
240 | ||
742dcd11 | 241 | /* Only the first slave id for a PMIC contains this information */ |
e9c11c6e CC |
242 | if (sdev->usid % ctx->num_usids == 0) { |
243 | ret = pmic_spmi_load_revid(regmap, &sdev->dev, &ctx->pmic); | |
244 | if (ret < 0) | |
245 | return ret; | |
246 | } | |
247 | spmi_device_set_drvdata(sdev, ctx); | |
dc716bbf | 248 | |
6f00f8c8 | 249 | return devm_of_platform_populate(&sdev->dev); |
c3a973a7 JC |
250 | } |
251 | ||
c3a973a7 JC |
252 | MODULE_DEVICE_TABLE(of, pmic_spmi_id_table); |
253 | ||
254 | static struct spmi_driver pmic_spmi_driver = { | |
255 | .probe = pmic_spmi_probe, | |
c3a973a7 JC |
256 | .driver = { |
257 | .name = "pmic-spmi", | |
258 | .of_match_table = pmic_spmi_id_table, | |
259 | }, | |
260 | }; | |
261 | module_spmi_driver(pmic_spmi_driver); | |
262 | ||
263 | MODULE_DESCRIPTION("Qualcomm SPMI PMIC driver"); | |
264 | MODULE_ALIAS("spmi:spmi-pmic"); | |
265 | MODULE_LICENSE("GPL v2"); | |
266 | MODULE_AUTHOR("Josh Cartwright <joshc@codeaurora.org>"); | |
267 | MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>"); |