1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2014, The Linux Foundation. All rights reserved. 4 */ 5 6 #include <linux/device.h> 7 #include <linux/errno.h> 8 #include <linux/gfp.h> 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 #include <linux/spmi.h> 12 #include <linux/types.h> 13 #include <linux/regmap.h> 14 #include <linux/of_platform.h> 15 #include <soc/qcom/qcom-spmi-pmic.h> 16 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 22 #define PMIC_FAB_ID 0x1f2 23 24 #define PMIC_TYPE_VALUE 0x51 25 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) 34 35 static const struct of_device_id pmic_spmi_id_table[] = { 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) }, 63 { .compatible = "qcom,pmp8074", .data = N_USIDS(2) }, 64 { .compatible = "qcom,smb2351", .data = N_USIDS(2) }, 65 { .compatible = "qcom,spmi-pmic", .data = N_USIDS(1) }, 66 { } 67 }; 68 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) 80 { 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; 87 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; 97 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; 136 137 ret = regmap_read(map, PMIC_TYPE, &pmic->type); 138 if (ret < 0) 139 return ret; 140 141 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; 147 148 pmic->name = of_match_device(pmic_spmi_id_table, dev)->compatible; 149 150 ret = regmap_read(map, PMIC_REV2, &pmic->rev2); 151 if (ret < 0) 152 return ret; 153 154 ret = regmap_read(map, PMIC_REV3, &pmic->minor); 155 if (ret < 0) 156 return ret; 157 158 ret = regmap_read(map, PMIC_REV4, &pmic->major); 159 if (ret < 0) 160 return ret; 161 162 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 } 167 168 /* 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 */ 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); 208 209 if (IS_ERR(sdev)) 210 return ERR_CAST(sdev); 211 212 spmi = dev_get_drvdata(&sdev->dev); 213 214 return &spmi->pmic; 215 } 216 EXPORT_SYMBOL(qcom_pmic_get); 217 218 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 { 227 struct regmap *regmap; 228 struct qcom_spmi_dev *ctx; 229 int ret; 230 231 regmap = devm_regmap_init_spmi_ext(sdev, &spmi_regmap_config); 232 if (IS_ERR(regmap)) 233 return PTR_ERR(regmap); 234 235 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); 240 241 /* Only the first slave id for a PMIC contains this information */ 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); 248 249 return devm_of_platform_populate(&sdev->dev); 250 } 251 252 MODULE_DEVICE_TABLE(of, pmic_spmi_id_table); 253 254 static struct spmi_driver pmic_spmi_driver = { 255 .probe = pmic_spmi_probe, 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>"); 268