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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
* Author: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
*/
#include <linux/device.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/pwrseq/provider.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
struct pwrseq_pcie_m2_pdata {
const struct pwrseq_target_data **targets;
};
struct pwrseq_pcie_m2_ctx {
struct pwrseq_device *pwrseq;
struct device_node *of_node;
const struct pwrseq_pcie_m2_pdata *pdata;
struct regulator_bulk_data *regs;
size_t num_vregs;
struct notifier_block nb;
};
static int pwrseq_pcie_m2_m_vregs_enable(struct pwrseq_device *pwrseq)
{
struct pwrseq_pcie_m2_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
return regulator_bulk_enable(ctx->num_vregs, ctx->regs);
}
static int pwrseq_pcie_m2_m_vregs_disable(struct pwrseq_device *pwrseq)
{
struct pwrseq_pcie_m2_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
return regulator_bulk_disable(ctx->num_vregs, ctx->regs);
}
static const struct pwrseq_unit_data pwrseq_pcie_m2_vregs_unit_data = {
.name = "regulators-enable",
.enable = pwrseq_pcie_m2_m_vregs_enable,
.disable = pwrseq_pcie_m2_m_vregs_disable,
};
static const struct pwrseq_unit_data *pwrseq_pcie_m2_m_unit_deps[] = {
&pwrseq_pcie_m2_vregs_unit_data,
NULL
};
static const struct pwrseq_unit_data pwrseq_pcie_m2_m_pcie_unit_data = {
.name = "pcie-enable",
.deps = pwrseq_pcie_m2_m_unit_deps,
};
static const struct pwrseq_target_data pwrseq_pcie_m2_m_pcie_target_data = {
.name = "pcie",
.unit = &pwrseq_pcie_m2_m_pcie_unit_data,
};
static const struct pwrseq_target_data *pwrseq_pcie_m2_m_targets[] = {
&pwrseq_pcie_m2_m_pcie_target_data,
NULL
};
static const struct pwrseq_pcie_m2_pdata pwrseq_pcie_m2_m_of_data = {
.targets = pwrseq_pcie_m2_m_targets,
};
static int pwrseq_pcie_m2_match(struct pwrseq_device *pwrseq,
struct device *dev)
{
struct pwrseq_pcie_m2_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
struct device_node *endpoint __free(device_node) = NULL;
/*
* Traverse the 'remote-endpoint' nodes and check if the remote node's
* parent matches the OF node of 'dev'.
*/
for_each_endpoint_of_node(ctx->of_node, endpoint) {
struct device_node *remote __free(device_node) =
of_graph_get_remote_port_parent(endpoint);
if (remote && (remote == dev_of_node(dev)))
return PWRSEQ_MATCH_OK;
}
return PWRSEQ_NO_MATCH;
}
static void pwrseq_pcie_m2_free_regulators(void *data)
{
struct pwrseq_pcie_m2_ctx *ctx = data;
regulator_bulk_free(ctx->num_vregs, ctx->regs);
}
static int pwrseq_pcie_m2_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct pwrseq_pcie_m2_ctx *ctx;
struct pwrseq_config config = {};
int ret;
ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->of_node = of_node_get(dev->of_node);
ctx->pdata = device_get_match_data(dev);
if (!ctx->pdata)
return dev_err_probe(dev, -ENODEV,
"Failed to obtain platform data\n");
/*
* Currently, of_regulator_bulk_get_all() is the only regulator API that
* allows to get all supplies in the devicetree node without manually
* specifying them.
*/
ret = of_regulator_bulk_get_all(dev, dev_of_node(dev), &ctx->regs);
if (ret < 0)
return dev_err_probe(dev, ret,
"Failed to get all regulators\n");
ctx->num_vregs = ret;
ret = devm_add_action_or_reset(dev, pwrseq_pcie_m2_free_regulators, ctx);
if (ret)
return ret;
config.parent = dev;
config.owner = THIS_MODULE;
config.drvdata = ctx;
config.match = pwrseq_pcie_m2_match;
config.targets = ctx->pdata->targets;
ctx->pwrseq = devm_pwrseq_device_register(dev, &config);
if (IS_ERR(ctx->pwrseq))
return dev_err_probe(dev, PTR_ERR(ctx->pwrseq),
"Failed to register the power sequencer\n");
return 0;
}
static const struct of_device_id pwrseq_pcie_m2_of_match[] = {
{
.compatible = "pcie-m2-m-connector",
.data = &pwrseq_pcie_m2_m_of_data,
},
{ }
};
MODULE_DEVICE_TABLE(of, pwrseq_pcie_m2_of_match);
static struct platform_driver pwrseq_pcie_m2_driver = {
.driver = {
.name = "pwrseq-pcie-m2",
.of_match_table = pwrseq_pcie_m2_of_match,
},
.probe = pwrseq_pcie_m2_probe,
};
module_platform_driver(pwrseq_pcie_m2_driver);
MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>");
MODULE_DESCRIPTION("Power Sequencing driver for PCIe M.2 connector");
MODULE_LICENSE("GPL");
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