diff options
Diffstat (limited to 'drivers/mfd/qcom-spmi-pmic.c')
| -rw-r--r-- | drivers/mfd/qcom-spmi-pmic.c | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/drivers/mfd/qcom-spmi-pmic.c b/drivers/mfd/qcom-spmi-pmic.c new file mode 100644 index 000000000..8e449cff5 --- /dev/null +++ b/drivers/mfd/qcom-spmi-pmic.c @@ -0,0 +1,310 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2014, The Linux Foundation. All rights reserved. + */ + +#include <linux/device.h> +#include <linux/errno.h> +#include <linux/gfp.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/spmi.h> +#include <linux/types.h> +#include <linux/regmap.h> +#include <linux/of_platform.h> +#include <soc/qcom/qcom-spmi-pmic.h> + +#define PMIC_REV2 0x101 +#define PMIC_REV3 0x102 +#define PMIC_REV4 0x103 +#define PMIC_TYPE 0x104 +#define PMIC_SUBTYPE 0x105 +#define PMIC_FAB_ID 0x1f2 + +#define PMIC_TYPE_VALUE 0x51 + +#define PMIC_REV4_V2 0x02 + +struct qcom_spmi_dev { + int num_usids; + struct qcom_spmi_pmic pmic; +}; + +static DEFINE_MUTEX(pmic_spmi_revid_lock); + +#define N_USIDS(n) ((void *)n) + +static const struct of_device_id pmic_spmi_id_table[] = { + { .compatible = "qcom,pm660", .data = N_USIDS(2) }, + { .compatible = "qcom,pm660l", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8004", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8005", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8019", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8028", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8110", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8150", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8150b", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8150c", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8150l", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8226", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8841", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8901", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8909", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8916", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8941", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8950", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8994", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8998", .data = N_USIDS(2) }, + { .compatible = "qcom,pma8084", .data = N_USIDS(2) }, + { .compatible = "qcom,pmd9635", .data = N_USIDS(2) }, + { .compatible = "qcom,pmi8950", .data = N_USIDS(2) }, + { .compatible = "qcom,pmi8962", .data = N_USIDS(2) }, + { .compatible = "qcom,pmi8994", .data = N_USIDS(2) }, + { .compatible = "qcom,pmi8998", .data = N_USIDS(2) }, + { .compatible = "qcom,pmk8002", .data = N_USIDS(2) }, + { .compatible = "qcom,pmp8074", .data = N_USIDS(2) }, + { .compatible = "qcom,smb2351", .data = N_USIDS(2) }, + { .compatible = "qcom,spmi-pmic", .data = N_USIDS(1) }, + { } +}; + +/* + * A PMIC can be represented by multiple SPMI devices, but + * only the base PMIC device will contain a reference to + * the revision information. + * + * This function takes a pointer to a pmic device and + * returns a pointer to the base PMIC device. + * + * This only supports PMICs with 1 or 2 USIDs. + */ +static struct spmi_device *qcom_pmic_get_base_usid(struct spmi_device *sdev, struct qcom_spmi_dev *ctx) +{ + struct device_node *spmi_bus; + struct device_node *child; + int function_parent_usid, ret; + u32 pmic_addr; + + /* + * Quick return if the function device is already in the base + * USID. This will always be hit for PMICs with only 1 USID. + */ + if (sdev->usid % ctx->num_usids == 0) { + get_device(&sdev->dev); + return sdev; + } + + function_parent_usid = sdev->usid; + + /* + * Walk through the list of PMICs until we find the sibling USID. + * The goal is to find the first USID which is less than the + * number of USIDs in the PMIC array, e.g. for a PMIC with 2 USIDs + * where the function device is under USID 3, we want to find the + * device for USID 2. + */ + spmi_bus = of_get_parent(sdev->dev.of_node); + sdev = ERR_PTR(-ENODATA); + for_each_child_of_node(spmi_bus, child) { + ret = of_property_read_u32_index(child, "reg", 0, &pmic_addr); + if (ret) { + of_node_put(child); + sdev = ERR_PTR(ret); + break; + } + + if (pmic_addr == function_parent_usid - (ctx->num_usids - 1)) { + sdev = spmi_device_from_of(child); + if (!sdev) { + /* + * If the base USID for this PMIC hasn't been + * registered yet then we need to defer. + */ + sdev = ERR_PTR(-EPROBE_DEFER); + } + of_node_put(child); + break; + } + } + + of_node_put(spmi_bus); + + return sdev; +} + +static int pmic_spmi_get_base_revid(struct spmi_device *sdev, struct qcom_spmi_dev *ctx) +{ + struct qcom_spmi_dev *base_ctx; + struct spmi_device *base; + int ret = 0; + + base = qcom_pmic_get_base_usid(sdev, ctx); + if (IS_ERR(base)) + return PTR_ERR(base); + + /* + * Copy revid info from base device if it has probed and is still + * bound to its driver. + */ + mutex_lock(&pmic_spmi_revid_lock); + base_ctx = spmi_device_get_drvdata(base); + if (!base_ctx) { + ret = -EPROBE_DEFER; + goto out_unlock; + } + memcpy(&ctx->pmic, &base_ctx->pmic, sizeof(ctx->pmic)); +out_unlock: + mutex_unlock(&pmic_spmi_revid_lock); + + put_device(&base->dev); + + return ret; +} + +static int pmic_spmi_load_revid(struct regmap *map, struct device *dev, + struct qcom_spmi_pmic *pmic) +{ + int ret; + + ret = regmap_read(map, PMIC_TYPE, &pmic->type); + if (ret < 0) + return ret; + + if (pmic->type != PMIC_TYPE_VALUE) + return ret; + + ret = regmap_read(map, PMIC_SUBTYPE, &pmic->subtype); + if (ret < 0) + return ret; + + pmic->name = of_match_device(pmic_spmi_id_table, dev)->compatible; + + ret = regmap_read(map, PMIC_REV2, &pmic->rev2); + if (ret < 0) + return ret; + + ret = regmap_read(map, PMIC_REV3, &pmic->minor); + if (ret < 0) + return ret; + + ret = regmap_read(map, PMIC_REV4, &pmic->major); + if (ret < 0) + return ret; + + if (pmic->subtype == PMI8998_SUBTYPE || pmic->subtype == PM660_SUBTYPE) { + ret = regmap_read(map, PMIC_FAB_ID, &pmic->fab_id); + if (ret < 0) + return ret; + } + + /* + * In early versions of PM8941 and PM8226, the major revision number + * started incrementing from 0 (eg 0 = v1.0, 1 = v2.0). + * Increment the major revision number here if the chip is an early + * version of PM8941 or PM8226. + */ + if ((pmic->subtype == PM8941_SUBTYPE || pmic->subtype == PM8226_SUBTYPE) && + pmic->major < PMIC_REV4_V2) + pmic->major++; + + if (pmic->subtype == PM8110_SUBTYPE) + pmic->minor = pmic->rev2; + + dev_dbg(dev, "%x: %s v%d.%d\n", + pmic->subtype, pmic->name, pmic->major, pmic->minor); + + return 0; +} + +/** + * qcom_pmic_get() - Get a pointer to the base PMIC device + * + * This function takes a struct device for a driver which is a child of a PMIC. + * And locates the PMIC revision information for it. + * + * @dev: the pmic function device + * @return: the struct qcom_spmi_pmic* pointer associated with the function device + */ +const struct qcom_spmi_pmic *qcom_pmic_get(struct device *dev) +{ + struct spmi_device *sdev; + struct qcom_spmi_dev *spmi; + + /* + * Make sure the device is actually a child of a PMIC + */ + if (!of_match_device(pmic_spmi_id_table, dev->parent)) + return ERR_PTR(-EINVAL); + + sdev = to_spmi_device(dev->parent); + spmi = dev_get_drvdata(&sdev->dev); + + return &spmi->pmic; +} +EXPORT_SYMBOL(qcom_pmic_get); + +static const struct regmap_config spmi_regmap_config = { + .reg_bits = 16, + .val_bits = 8, + .max_register = 0xffff, + .fast_io = true, +}; + +static int pmic_spmi_probe(struct spmi_device *sdev) +{ + struct regmap *regmap; + struct qcom_spmi_dev *ctx; + int ret; + + regmap = devm_regmap_init_spmi_ext(sdev, &spmi_regmap_config); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + ctx = devm_kzalloc(&sdev->dev, sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + ctx->num_usids = (uintptr_t)of_device_get_match_data(&sdev->dev); + + /* Only the first slave id for a PMIC contains this information */ + if (sdev->usid % ctx->num_usids == 0) { + ret = pmic_spmi_load_revid(regmap, &sdev->dev, &ctx->pmic); + if (ret < 0) + return ret; + } else { + ret = pmic_spmi_get_base_revid(sdev, ctx); + if (ret) + return ret; + } + + mutex_lock(&pmic_spmi_revid_lock); + spmi_device_set_drvdata(sdev, ctx); + mutex_unlock(&pmic_spmi_revid_lock); + + return devm_of_platform_populate(&sdev->dev); +} + +static void pmic_spmi_remove(struct spmi_device *sdev) +{ + mutex_lock(&pmic_spmi_revid_lock); + spmi_device_set_drvdata(sdev, NULL); + mutex_unlock(&pmic_spmi_revid_lock); +} + +MODULE_DEVICE_TABLE(of, pmic_spmi_id_table); + +static struct spmi_driver pmic_spmi_driver = { + .probe = pmic_spmi_probe, + .remove = pmic_spmi_remove, + .driver = { + .name = "pmic-spmi", + .of_match_table = pmic_spmi_id_table, + }, +}; +module_spmi_driver(pmic_spmi_driver); + +MODULE_DESCRIPTION("Qualcomm SPMI PMIC driver"); +MODULE_ALIAS("spmi:spmi-pmic"); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Josh Cartwright <joshc@codeaurora.org>"); +MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>"); |