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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2024 Linaro Ltd.
* Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
*/
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/of_graph.h>
#include <linux/pci-pwrctrl.h>
#include <linux/platform_device.h>
#include <linux/pwrseq/consumer.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
struct slot_pwrctrl {
struct pci_pwrctrl pwrctrl;
struct regulator_bulk_data *supplies;
int num_supplies;
struct clk *clk;
struct pwrseq_desc *pwrseq;
};
static int slot_pwrctrl_power_on(struct pci_pwrctrl *pwrctrl)
{
struct slot_pwrctrl *slot = container_of(pwrctrl,
struct slot_pwrctrl, pwrctrl);
int ret;
if (slot->pwrseq) {
pwrseq_power_on(slot->pwrseq);
return 0;
}
ret = regulator_bulk_enable(slot->num_supplies, slot->supplies);
if (ret < 0) {
dev_err(slot->pwrctrl.dev, "Failed to enable slot regulators\n");
return ret;
}
return clk_prepare_enable(slot->clk);
}
static int slot_pwrctrl_power_off(struct pci_pwrctrl *pwrctrl)
{
struct slot_pwrctrl *slot = container_of(pwrctrl,
struct slot_pwrctrl, pwrctrl);
if (slot->pwrseq) {
pwrseq_power_off(slot->pwrseq);
return 0;
}
regulator_bulk_disable(slot->num_supplies, slot->supplies);
clk_disable_unprepare(slot->clk);
return 0;
}
static void devm_slot_pwrctrl_release(void *data)
{
struct slot_pwrctrl *slot = data;
slot_pwrctrl_power_off(&slot->pwrctrl);
regulator_bulk_free(slot->num_supplies, slot->supplies);
}
static int slot_pwrctrl_probe(struct platform_device *pdev)
{
struct slot_pwrctrl *slot;
struct device *dev = &pdev->dev;
int ret;
slot = devm_kzalloc(dev, sizeof(*slot), GFP_KERNEL);
if (!slot)
return -ENOMEM;
if (of_graph_is_present(dev_of_node(dev))) {
slot->pwrseq = devm_pwrseq_get(dev, "pcie");
if (IS_ERR(slot->pwrseq))
return dev_err_probe(dev, PTR_ERR(slot->pwrseq),
"Failed to get the power sequencer\n");
goto skip_resources;
}
ret = of_regulator_bulk_get_all(dev, dev_of_node(dev),
&slot->supplies);
if (ret < 0) {
dev_err_probe(dev, ret, "Failed to get slot regulators\n");
return ret;
}
slot->num_supplies = ret;
slot->clk = devm_clk_get_optional(dev, NULL);
if (IS_ERR(slot->clk)) {
return dev_err_probe(dev, PTR_ERR(slot->clk),
"Failed to enable slot clock\n");
}
skip_resources:
slot->pwrctrl.power_on = slot_pwrctrl_power_on;
slot->pwrctrl.power_off = slot_pwrctrl_power_off;
ret = devm_add_action_or_reset(dev, devm_slot_pwrctrl_release, slot);
if (ret)
return ret;
pci_pwrctrl_init(&slot->pwrctrl, dev);
ret = devm_pci_pwrctrl_device_set_ready(dev, &slot->pwrctrl);
if (ret)
return dev_err_probe(dev, ret, "Failed to register pwrctrl driver\n");
return 0;
}
static const struct of_device_id slot_pwrctrl_of_match[] = {
{
.compatible = "pciclass,0604",
},
{ }
};
MODULE_DEVICE_TABLE(of, slot_pwrctrl_of_match);
static struct platform_driver slot_pwrctrl_driver = {
.driver = {
.name = "pci-pwrctrl-slot",
.of_match_table = slot_pwrctrl_of_match,
},
.probe = slot_pwrctrl_probe,
};
module_platform_driver(slot_pwrctrl_driver);
MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
MODULE_DESCRIPTION("Generic PCI Power Control driver for PCI Slots");
MODULE_LICENSE("GPL");
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