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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> | |
830fafce RH |
11 | #include <linux/of.h> |
12 | #include <linux/of_device.h> | |
13 | #include <linux/of_platform.h> | |
c3a973a7 | 14 | #include <linux/spmi.h> |
e9c11c6e | 15 | #include <linux/types.h> |
c3a973a7 | 16 | #include <linux/regmap.h> |
e9c11c6e | 17 | #include <soc/qcom/qcom-spmi-pmic.h> |
c3a973a7 | 18 | |
dc716bbf II |
19 | #define PMIC_REV2 0x101 |
20 | #define PMIC_REV3 0x102 | |
21 | #define PMIC_REV4 0x103 | |
22 | #define PMIC_TYPE 0x104 | |
23 | #define PMIC_SUBTYPE 0x105 | |
d23c3c08 | 24 | #define PMIC_FAB_ID 0x1f2 |
dc716bbf II |
25 | |
26 | #define PMIC_TYPE_VALUE 0x51 | |
27 | ||
e9c11c6e CC |
28 | #define PMIC_REV4_V2 0x02 |
29 | ||
30 | struct qcom_spmi_dev { | |
31 | int num_usids; | |
32 | struct qcom_spmi_pmic pmic; | |
33 | }; | |
34 | ||
7b439aaa JH |
35 | static DEFINE_MUTEX(pmic_spmi_revid_lock); |
36 | ||
e9c11c6e | 37 | #define N_USIDS(n) ((void *)n) |
dc716bbf II |
38 | |
39 | static const struct of_device_id pmic_spmi_id_table[] = { | |
e9c11c6e CC |
40 | { .compatible = "qcom,pm660", .data = N_USIDS(2) }, |
41 | { .compatible = "qcom,pm660l", .data = N_USIDS(2) }, | |
42 | { .compatible = "qcom,pm8004", .data = N_USIDS(2) }, | |
43 | { .compatible = "qcom,pm8005", .data = N_USIDS(2) }, | |
44 | { .compatible = "qcom,pm8019", .data = N_USIDS(2) }, | |
45 | { .compatible = "qcom,pm8028", .data = N_USIDS(2) }, | |
46 | { .compatible = "qcom,pm8110", .data = N_USIDS(2) }, | |
47 | { .compatible = "qcom,pm8150", .data = N_USIDS(2) }, | |
48 | { .compatible = "qcom,pm8150b", .data = N_USIDS(2) }, | |
49 | { .compatible = "qcom,pm8150c", .data = N_USIDS(2) }, | |
50 | { .compatible = "qcom,pm8150l", .data = N_USIDS(2) }, | |
51 | { .compatible = "qcom,pm8226", .data = N_USIDS(2) }, | |
52 | { .compatible = "qcom,pm8841", .data = N_USIDS(2) }, | |
53 | { .compatible = "qcom,pm8901", .data = N_USIDS(2) }, | |
54 | { .compatible = "qcom,pm8909", .data = N_USIDS(2) }, | |
55 | { .compatible = "qcom,pm8916", .data = N_USIDS(2) }, | |
4773d2f1 | 56 | { .compatible = "qcom,pm8937", .data = N_USIDS(2) }, |
e9c11c6e CC |
57 | { .compatible = "qcom,pm8941", .data = N_USIDS(2) }, |
58 | { .compatible = "qcom,pm8950", .data = N_USIDS(2) }, | |
59 | { .compatible = "qcom,pm8994", .data = N_USIDS(2) }, | |
60 | { .compatible = "qcom,pm8998", .data = N_USIDS(2) }, | |
61 | { .compatible = "qcom,pma8084", .data = N_USIDS(2) }, | |
62 | { .compatible = "qcom,pmd9635", .data = N_USIDS(2) }, | |
63 | { .compatible = "qcom,pmi8950", .data = N_USIDS(2) }, | |
64 | { .compatible = "qcom,pmi8962", .data = N_USIDS(2) }, | |
65 | { .compatible = "qcom,pmi8994", .data = N_USIDS(2) }, | |
66 | { .compatible = "qcom,pmi8998", .data = N_USIDS(2) }, | |
67 | { .compatible = "qcom,pmk8002", .data = N_USIDS(2) }, | |
90d7c403 | 68 | { .compatible = "qcom,pmp8074", .data = N_USIDS(2) }, |
e9c11c6e CC |
69 | { .compatible = "qcom,smb2351", .data = N_USIDS(2) }, |
70 | { .compatible = "qcom,spmi-pmic", .data = N_USIDS(1) }, | |
dc716bbf II |
71 | { } |
72 | }; | |
73 | ||
e9c11c6e CC |
74 | /* |
75 | * A PMIC can be represented by multiple SPMI devices, but | |
76 | * only the base PMIC device will contain a reference to | |
77 | * the revision information. | |
78 | * | |
79 | * This function takes a pointer to a pmic device and | |
80 | * returns a pointer to the base PMIC device. | |
81 | * | |
82 | * This only supports PMICs with 1 or 2 USIDs. | |
83 | */ | |
7b439aaa | 84 | static struct spmi_device *qcom_pmic_get_base_usid(struct spmi_device *sdev, struct qcom_spmi_dev *ctx) |
dc716bbf | 85 | { |
e9c11c6e | 86 | struct device_node *spmi_bus; |
a0fa44c2 | 87 | struct device_node *child; |
e9c11c6e CC |
88 | int function_parent_usid, ret; |
89 | u32 pmic_addr; | |
dc716bbf | 90 | |
e9c11c6e CC |
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 | */ | |
7b439aaa JH |
95 | if (sdev->usid % ctx->num_usids == 0) { |
96 | get_device(&sdev->dev); | |
e9c11c6e | 97 | return sdev; |
7b439aaa | 98 | } |
dc716bbf | 99 | |
e9c11c6e CC |
100 | function_parent_usid = sdev->usid; |
101 | ||
102 | /* | |
103 | * Walk through the list of PMICs until we find the sibling USID. | |
104 | * The goal is to find the first USID which is less than the | |
105 | * number of USIDs in the PMIC array, e.g. for a PMIC with 2 USIDs | |
106 | * where the function device is under USID 3, we want to find the | |
107 | * device for USID 2. | |
108 | */ | |
109 | spmi_bus = of_get_parent(sdev->dev.of_node); | |
a0fa44c2 JH |
110 | sdev = ERR_PTR(-ENODATA); |
111 | for_each_child_of_node(spmi_bus, child) { | |
112 | ret = of_property_read_u32_index(child, "reg", 0, &pmic_addr); | |
113 | if (ret) { | |
114 | of_node_put(child); | |
115 | sdev = ERR_PTR(ret); | |
116 | break; | |
117 | } | |
e9c11c6e | 118 | |
e9c11c6e | 119 | if (pmic_addr == function_parent_usid - (ctx->num_usids - 1)) { |
272f99ed | 120 | sdev = spmi_find_device_by_of_node(child); |
a0fa44c2 | 121 | if (!sdev) { |
e9c11c6e | 122 | /* |
7b439aaa JH |
123 | * If the base USID for this PMIC hasn't been |
124 | * registered yet then we need to defer. | |
e9c11c6e | 125 | */ |
a0fa44c2 JH |
126 | sdev = ERR_PTR(-EPROBE_DEFER); |
127 | } | |
128 | of_node_put(child); | |
129 | break; | |
e9c11c6e | 130 | } |
a0fa44c2 JH |
131 | } |
132 | ||
133 | of_node_put(spmi_bus); | |
e9c11c6e | 134 | |
a0fa44c2 | 135 | return sdev; |
e9c11c6e CC |
136 | } |
137 | ||
7b439aaa JH |
138 | static int pmic_spmi_get_base_revid(struct spmi_device *sdev, struct qcom_spmi_dev *ctx) |
139 | { | |
140 | struct qcom_spmi_dev *base_ctx; | |
141 | struct spmi_device *base; | |
142 | int ret = 0; | |
143 | ||
144 | base = qcom_pmic_get_base_usid(sdev, ctx); | |
145 | if (IS_ERR(base)) | |
146 | return PTR_ERR(base); | |
147 | ||
148 | /* | |
149 | * Copy revid info from base device if it has probed and is still | |
150 | * bound to its driver. | |
151 | */ | |
152 | mutex_lock(&pmic_spmi_revid_lock); | |
153 | base_ctx = spmi_device_get_drvdata(base); | |
154 | if (!base_ctx) { | |
155 | ret = -EPROBE_DEFER; | |
156 | goto out_unlock; | |
157 | } | |
158 | memcpy(&ctx->pmic, &base_ctx->pmic, sizeof(ctx->pmic)); | |
159 | out_unlock: | |
160 | mutex_unlock(&pmic_spmi_revid_lock); | |
161 | ||
162 | put_device(&base->dev); | |
163 | ||
164 | return ret; | |
165 | } | |
166 | ||
e9c11c6e CC |
167 | static int pmic_spmi_load_revid(struct regmap *map, struct device *dev, |
168 | struct qcom_spmi_pmic *pmic) | |
169 | { | |
170 | int ret; | |
dc716bbf | 171 | |
e9c11c6e | 172 | ret = regmap_read(map, PMIC_TYPE, &pmic->type); |
dc716bbf | 173 | if (ret < 0) |
e9c11c6e | 174 | return ret; |
dc716bbf | 175 | |
e9c11c6e CC |
176 | if (pmic->type != PMIC_TYPE_VALUE) |
177 | return ret; | |
178 | ||
179 | ret = regmap_read(map, PMIC_SUBTYPE, &pmic->subtype); | |
180 | if (ret < 0) | |
181 | return ret; | |
dc716bbf | 182 | |
e9c11c6e | 183 | pmic->name = of_match_device(pmic_spmi_id_table, dev)->compatible; |
dc716bbf | 184 | |
e9c11c6e | 185 | ret = regmap_read(map, PMIC_REV2, &pmic->rev2); |
dc716bbf | 186 | if (ret < 0) |
e9c11c6e | 187 | return ret; |
dc716bbf | 188 | |
e9c11c6e | 189 | ret = regmap_read(map, PMIC_REV3, &pmic->minor); |
dc716bbf | 190 | if (ret < 0) |
e9c11c6e | 191 | return ret; |
dc716bbf | 192 | |
e9c11c6e | 193 | ret = regmap_read(map, PMIC_REV4, &pmic->major); |
dc716bbf | 194 | if (ret < 0) |
e9c11c6e | 195 | return ret; |
dc716bbf | 196 | |
d23c3c08 CC |
197 | if (pmic->subtype == PMI8998_SUBTYPE || pmic->subtype == PM660_SUBTYPE) { |
198 | ret = regmap_read(map, PMIC_FAB_ID, &pmic->fab_id); | |
199 | if (ret < 0) | |
200 | return ret; | |
201 | } | |
202 | ||
dc716bbf II |
203 | /* |
204 | * In early versions of PM8941 and PM8226, the major revision number | |
205 | * started incrementing from 0 (eg 0 = v1.0, 1 = v2.0). | |
206 | * Increment the major revision number here if the chip is an early | |
207 | * version of PM8941 or PM8226. | |
208 | */ | |
e9c11c6e CC |
209 | if ((pmic->subtype == PM8941_SUBTYPE || pmic->subtype == PM8226_SUBTYPE) && |
210 | pmic->major < PMIC_REV4_V2) | |
211 | pmic->major++; | |
212 | ||
213 | if (pmic->subtype == PM8110_SUBTYPE) | |
214 | pmic->minor = pmic->rev2; | |
215 | ||
216 | dev_dbg(dev, "%x: %s v%d.%d\n", | |
217 | pmic->subtype, pmic->name, pmic->major, pmic->minor); | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | /** | |
223 | * qcom_pmic_get() - Get a pointer to the base PMIC device | |
224 | * | |
225 | * This function takes a struct device for a driver which is a child of a PMIC. | |
226 | * And locates the PMIC revision information for it. | |
227 | * | |
228 | * @dev: the pmic function device | |
229 | * @return: the struct qcom_spmi_pmic* pointer associated with the function device | |
230 | */ | |
231 | const struct qcom_spmi_pmic *qcom_pmic_get(struct device *dev) | |
232 | { | |
233 | struct spmi_device *sdev; | |
234 | struct qcom_spmi_dev *spmi; | |
235 | ||
236 | /* | |
237 | * Make sure the device is actually a child of a PMIC | |
238 | */ | |
239 | if (!of_match_device(pmic_spmi_id_table, dev->parent)) | |
240 | return ERR_PTR(-EINVAL); | |
241 | ||
7b439aaa | 242 | sdev = to_spmi_device(dev->parent); |
e9c11c6e CC |
243 | spmi = dev_get_drvdata(&sdev->dev); |
244 | ||
245 | return &spmi->pmic; | |
dc716bbf | 246 | } |
10450565 | 247 | EXPORT_SYMBOL_GPL(qcom_pmic_get); |
dc716bbf | 248 | |
c3a973a7 JC |
249 | static const struct regmap_config spmi_regmap_config = { |
250 | .reg_bits = 16, | |
251 | .val_bits = 8, | |
252 | .max_register = 0xffff, | |
253 | .fast_io = true, | |
254 | }; | |
255 | ||
256 | static int pmic_spmi_probe(struct spmi_device *sdev) | |
257 | { | |
c3a973a7 | 258 | struct regmap *regmap; |
e9c11c6e CC |
259 | struct qcom_spmi_dev *ctx; |
260 | int ret; | |
c3a973a7 JC |
261 | |
262 | regmap = devm_regmap_init_spmi_ext(sdev, &spmi_regmap_config); | |
263 | if (IS_ERR(regmap)) | |
264 | return PTR_ERR(regmap); | |
265 | ||
e9c11c6e CC |
266 | ctx = devm_kzalloc(&sdev->dev, sizeof(*ctx), GFP_KERNEL); |
267 | if (!ctx) | |
268 | return -ENOMEM; | |
269 | ||
830fafce | 270 | ctx->num_usids = (uintptr_t)device_get_match_data(&sdev->dev); |
e9c11c6e | 271 | |
742dcd11 | 272 | /* Only the first slave id for a PMIC contains this information */ |
e9c11c6e CC |
273 | if (sdev->usid % ctx->num_usids == 0) { |
274 | ret = pmic_spmi_load_revid(regmap, &sdev->dev, &ctx->pmic); | |
275 | if (ret < 0) | |
276 | return ret; | |
7b439aaa JH |
277 | } else { |
278 | ret = pmic_spmi_get_base_revid(sdev, ctx); | |
279 | if (ret) | |
280 | return ret; | |
e9c11c6e | 281 | } |
7b439aaa JH |
282 | |
283 | mutex_lock(&pmic_spmi_revid_lock); | |
e9c11c6e | 284 | spmi_device_set_drvdata(sdev, ctx); |
7b439aaa | 285 | mutex_unlock(&pmic_spmi_revid_lock); |
dc716bbf | 286 | |
6f00f8c8 | 287 | return devm_of_platform_populate(&sdev->dev); |
c3a973a7 JC |
288 | } |
289 | ||
7b439aaa JH |
290 | static void pmic_spmi_remove(struct spmi_device *sdev) |
291 | { | |
292 | mutex_lock(&pmic_spmi_revid_lock); | |
293 | spmi_device_set_drvdata(sdev, NULL); | |
294 | mutex_unlock(&pmic_spmi_revid_lock); | |
295 | } | |
296 | ||
c3a973a7 JC |
297 | MODULE_DEVICE_TABLE(of, pmic_spmi_id_table); |
298 | ||
299 | static struct spmi_driver pmic_spmi_driver = { | |
300 | .probe = pmic_spmi_probe, | |
7b439aaa | 301 | .remove = pmic_spmi_remove, |
c3a973a7 JC |
302 | .driver = { |
303 | .name = "pmic-spmi", | |
304 | .of_match_table = pmic_spmi_id_table, | |
305 | }, | |
306 | }; | |
307 | module_spmi_driver(pmic_spmi_driver); | |
308 | ||
309 | MODULE_DESCRIPTION("Qualcomm SPMI PMIC driver"); | |
310 | MODULE_ALIAS("spmi:spmi-pmic"); | |
311 | MODULE_LICENSE("GPL v2"); | |
312 | MODULE_AUTHOR("Josh Cartwright <joshc@codeaurora.org>"); | |
313 | MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>"); |