e9c11c6e3a
Some PMIC functions such as the RRADC need to be aware of the PMIC chip revision information to implement errata or otherwise adjust behaviour, export the PMIC information to enable this. This is specifically required to enable the RRADC to adjust coefficients based on which chip fab the PMIC was produced in, this can vary per unique device and therefore has to be read at runtime. Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Tested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Acked-by: Lee Jones <lee.jones@linaro.org> Link: https://lore.kernel.org/r/20220429220904.137297-3-caleb.connolly@linaro.org Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
260 lines
7.2 KiB
C
260 lines
7.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2014, The Linux Foundation. All rights reserved.
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*/
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/gfp.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/spmi.h>
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#include <linux/types.h>
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#include <linux/regmap.h>
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#include <linux/of_platform.h>
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#include <soc/qcom/qcom-spmi-pmic.h>
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#define PMIC_REV2 0x101
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#define PMIC_REV3 0x102
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#define PMIC_REV4 0x103
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#define PMIC_TYPE 0x104
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#define PMIC_SUBTYPE 0x105
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#define PMIC_TYPE_VALUE 0x51
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#define PMIC_REV4_V2 0x02
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struct qcom_spmi_dev {
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int num_usids;
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struct qcom_spmi_pmic pmic;
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};
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#define N_USIDS(n) ((void *)n)
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static const struct of_device_id pmic_spmi_id_table[] = {
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{ .compatible = "qcom,pm660", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm660l", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8004", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8005", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8019", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8028", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8110", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8150", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8150b", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8150c", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8150l", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8226", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8841", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8901", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8909", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8916", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8941", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8950", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8994", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8998", .data = N_USIDS(2) },
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{ .compatible = "qcom,pma8084", .data = N_USIDS(2) },
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{ .compatible = "qcom,pmd9635", .data = N_USIDS(2) },
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{ .compatible = "qcom,pmi8950", .data = N_USIDS(2) },
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{ .compatible = "qcom,pmi8962", .data = N_USIDS(2) },
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{ .compatible = "qcom,pmi8994", .data = N_USIDS(2) },
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{ .compatible = "qcom,pmi8998", .data = N_USIDS(2) },
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{ .compatible = "qcom,pmk8002", .data = N_USIDS(2) },
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{ .compatible = "qcom,smb2351", .data = N_USIDS(2) },
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{ .compatible = "qcom,spmi-pmic", .data = N_USIDS(1) },
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{ }
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};
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/*
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* A PMIC can be represented by multiple SPMI devices, but
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* only the base PMIC device will contain a reference to
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* the revision information.
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*
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* This function takes a pointer to a pmic device and
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* returns a pointer to the base PMIC device.
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*
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* This only supports PMICs with 1 or 2 USIDs.
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*/
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static struct spmi_device *qcom_pmic_get_base_usid(struct device *dev)
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{
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struct spmi_device *sdev;
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struct qcom_spmi_dev *ctx;
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struct device_node *spmi_bus;
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struct device_node *other_usid = NULL;
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int function_parent_usid, ret;
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u32 pmic_addr;
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sdev = to_spmi_device(dev);
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ctx = dev_get_drvdata(&sdev->dev);
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/*
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* Quick return if the function device is already in the base
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* USID. This will always be hit for PMICs with only 1 USID.
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*/
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if (sdev->usid % ctx->num_usids == 0)
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return sdev;
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function_parent_usid = sdev->usid;
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/*
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* Walk through the list of PMICs until we find the sibling USID.
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* The goal is to find the first USID which is less than the
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* number of USIDs in the PMIC array, e.g. for a PMIC with 2 USIDs
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* where the function device is under USID 3, we want to find the
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* device for USID 2.
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*/
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spmi_bus = of_get_parent(sdev->dev.of_node);
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do {
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other_usid = of_get_next_child(spmi_bus, other_usid);
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ret = of_property_read_u32_index(other_usid, "reg", 0, &pmic_addr);
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if (ret)
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return ERR_PTR(ret);
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sdev = spmi_device_from_of(other_usid);
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if (pmic_addr == function_parent_usid - (ctx->num_usids - 1)) {
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if (!sdev)
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/*
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* If the base USID for this PMIC hasn't probed yet
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* but the secondary USID has, then we need to defer
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* the function driver so that it will attempt to
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* probe again when the base USID is ready.
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*/
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return ERR_PTR(-EPROBE_DEFER);
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return sdev;
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}
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} while (other_usid->sibling);
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return ERR_PTR(-ENODATA);
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}
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static int pmic_spmi_load_revid(struct regmap *map, struct device *dev,
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struct qcom_spmi_pmic *pmic)
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{
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int ret;
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ret = regmap_read(map, PMIC_TYPE, &pmic->type);
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if (ret < 0)
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return ret;
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if (pmic->type != PMIC_TYPE_VALUE)
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return ret;
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ret = regmap_read(map, PMIC_SUBTYPE, &pmic->subtype);
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if (ret < 0)
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return ret;
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pmic->name = of_match_device(pmic_spmi_id_table, dev)->compatible;
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ret = regmap_read(map, PMIC_REV2, &pmic->rev2);
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if (ret < 0)
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return ret;
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ret = regmap_read(map, PMIC_REV3, &pmic->minor);
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if (ret < 0)
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return ret;
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ret = regmap_read(map, PMIC_REV4, &pmic->major);
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if (ret < 0)
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return ret;
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/*
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* In early versions of PM8941 and PM8226, the major revision number
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* started incrementing from 0 (eg 0 = v1.0, 1 = v2.0).
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* Increment the major revision number here if the chip is an early
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* version of PM8941 or PM8226.
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*/
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if ((pmic->subtype == PM8941_SUBTYPE || pmic->subtype == PM8226_SUBTYPE) &&
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pmic->major < PMIC_REV4_V2)
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pmic->major++;
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if (pmic->subtype == PM8110_SUBTYPE)
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pmic->minor = pmic->rev2;
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dev_dbg(dev, "%x: %s v%d.%d\n",
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pmic->subtype, pmic->name, pmic->major, pmic->minor);
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return 0;
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}
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/**
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* qcom_pmic_get() - Get a pointer to the base PMIC device
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*
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* This function takes a struct device for a driver which is a child of a PMIC.
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* And locates the PMIC revision information for it.
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*
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* @dev: the pmic function device
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* @return: the struct qcom_spmi_pmic* pointer associated with the function device
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*/
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const struct qcom_spmi_pmic *qcom_pmic_get(struct device *dev)
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{
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struct spmi_device *sdev;
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struct qcom_spmi_dev *spmi;
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/*
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* Make sure the device is actually a child of a PMIC
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*/
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if (!of_match_device(pmic_spmi_id_table, dev->parent))
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return ERR_PTR(-EINVAL);
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sdev = qcom_pmic_get_base_usid(dev->parent);
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if (IS_ERR(sdev))
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return ERR_CAST(sdev);
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spmi = dev_get_drvdata(&sdev->dev);
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return &spmi->pmic;
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}
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EXPORT_SYMBOL(qcom_pmic_get);
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static const struct regmap_config spmi_regmap_config = {
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.reg_bits = 16,
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.val_bits = 8,
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.max_register = 0xffff,
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.fast_io = true,
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};
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static int pmic_spmi_probe(struct spmi_device *sdev)
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{
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struct regmap *regmap;
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struct qcom_spmi_dev *ctx;
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int ret;
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regmap = devm_regmap_init_spmi_ext(sdev, &spmi_regmap_config);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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ctx = devm_kzalloc(&sdev->dev, sizeof(*ctx), GFP_KERNEL);
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if (!ctx)
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return -ENOMEM;
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ctx->num_usids = (uintptr_t)of_device_get_match_data(&sdev->dev);
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/* Only the first slave id for a PMIC contains this information */
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if (sdev->usid % ctx->num_usids == 0) {
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ret = pmic_spmi_load_revid(regmap, &sdev->dev, &ctx->pmic);
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if (ret < 0)
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return ret;
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}
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spmi_device_set_drvdata(sdev, ctx);
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return devm_of_platform_populate(&sdev->dev);
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}
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MODULE_DEVICE_TABLE(of, pmic_spmi_id_table);
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static struct spmi_driver pmic_spmi_driver = {
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.probe = pmic_spmi_probe,
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.driver = {
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.name = "pmic-spmi",
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.of_match_table = pmic_spmi_id_table,
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},
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};
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module_spmi_driver(pmic_spmi_driver);
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MODULE_DESCRIPTION("Qualcomm SPMI PMIC driver");
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MODULE_ALIAS("spmi:spmi-pmic");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Josh Cartwright <joshc@codeaurora.org>");
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MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>");
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