mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-16 07:51:31 -04:00
ff124bbbca
The driver is pretty generic and would fit for either PCI Slots or endpoints connected to PCI ports, so rename the driver and module as pci-pwrctrl-generic. Suggested-by: Manivannan Sadhasivam <mani@kernel.org> Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Manivannan Sadhasivam <mani@kernel.org> Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com> Link: https://patch.msgid.link/20260220-topic-sm8650-ayaneo-pocket-s2-base-v5-3-1ad79caa1efa@linaro.org
141 lines
3.3 KiB
C
141 lines
3.3 KiB
C
// 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");
|