linux/drivers/memory/pl353-smc.c
Rob Herring 0b4838717f memory: Explicitly include correct DT includes
The DT of_device.h and of_platform.h date back to the separate
of_platform_bus_type before it as merged into the regular platform bus.
As part of that merge prepping Arm DT support 13 years ago, they
"temporarily" include each other. They also include platform_device.h
and of.h. As a result, there's a pretty much random mix of those include
files used throughout the tree. In order to detangle these headers and
replace the implicit includes with struct declarations, users need to
explicitly include the correct includes.

Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230714174717.4059518-1-robh@kernel.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
2023-07-25 22:09:37 +02:00

171 lines
3.8 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* ARM PL353 SMC driver
*
* Copyright (C) 2012 - 2018 Xilinx, Inc
* Author: Punnaiah Choudary Kalluri <punnaiah@xilinx.com>
* Author: Naga Sureshkumar Relli <nagasure@xilinx.com>
*/
#include <linux/clk.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/amba/bus.h>
/**
* struct pl353_smc_data - Private smc driver structure
* @memclk: Pointer to the peripheral clock
* @aclk: Pointer to the AXI peripheral clock
*/
struct pl353_smc_data {
struct clk *memclk;
struct clk *aclk;
};
static int __maybe_unused pl353_smc_suspend(struct device *dev)
{
struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev);
clk_disable(pl353_smc->memclk);
clk_disable(pl353_smc->aclk);
return 0;
}
static int __maybe_unused pl353_smc_resume(struct device *dev)
{
struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev);
int ret;
ret = clk_enable(pl353_smc->aclk);
if (ret) {
dev_err(dev, "Cannot enable axi domain clock.\n");
return ret;
}
ret = clk_enable(pl353_smc->memclk);
if (ret) {
dev_err(dev, "Cannot enable memory clock.\n");
clk_disable(pl353_smc->aclk);
return ret;
}
return ret;
}
static SIMPLE_DEV_PM_OPS(pl353_smc_dev_pm_ops, pl353_smc_suspend,
pl353_smc_resume);
static const struct of_device_id pl353_smc_supported_children[] = {
{
.compatible = "cfi-flash"
},
{
.compatible = "arm,pl353-nand-r2p1",
},
{}
};
static int pl353_smc_probe(struct amba_device *adev, const struct amba_id *id)
{
struct device_node *of_node = adev->dev.of_node;
const struct of_device_id *match = NULL;
struct pl353_smc_data *pl353_smc;
struct device_node *child;
int err;
pl353_smc = devm_kzalloc(&adev->dev, sizeof(*pl353_smc), GFP_KERNEL);
if (!pl353_smc)
return -ENOMEM;
pl353_smc->aclk = devm_clk_get(&adev->dev, "apb_pclk");
if (IS_ERR(pl353_smc->aclk)) {
dev_err(&adev->dev, "aclk clock not found.\n");
return PTR_ERR(pl353_smc->aclk);
}
pl353_smc->memclk = devm_clk_get(&adev->dev, "memclk");
if (IS_ERR(pl353_smc->memclk)) {
dev_err(&adev->dev, "memclk clock not found.\n");
return PTR_ERR(pl353_smc->memclk);
}
err = clk_prepare_enable(pl353_smc->aclk);
if (err) {
dev_err(&adev->dev, "Unable to enable AXI clock.\n");
return err;
}
err = clk_prepare_enable(pl353_smc->memclk);
if (err) {
dev_err(&adev->dev, "Unable to enable memory clock.\n");
goto disable_axi_clk;
}
amba_set_drvdata(adev, pl353_smc);
/* Find compatible children. Only a single child is supported */
for_each_available_child_of_node(of_node, child) {
match = of_match_node(pl353_smc_supported_children, child);
if (!match) {
dev_warn(&adev->dev, "unsupported child node\n");
continue;
}
break;
}
if (!match) {
err = -ENODEV;
dev_err(&adev->dev, "no matching children\n");
goto disable_mem_clk;
}
of_platform_device_create(child, NULL, &adev->dev);
of_node_put(child);
return 0;
disable_mem_clk:
clk_disable_unprepare(pl353_smc->memclk);
disable_axi_clk:
clk_disable_unprepare(pl353_smc->aclk);
return err;
}
static void pl353_smc_remove(struct amba_device *adev)
{
struct pl353_smc_data *pl353_smc = amba_get_drvdata(adev);
clk_disable_unprepare(pl353_smc->memclk);
clk_disable_unprepare(pl353_smc->aclk);
}
static const struct amba_id pl353_ids[] = {
{
.id = 0x00041353,
.mask = 0x000fffff,
},
{ 0, 0 },
};
MODULE_DEVICE_TABLE(amba, pl353_ids);
static struct amba_driver pl353_smc_driver = {
.drv = {
.owner = THIS_MODULE,
.name = "pl353-smc",
.pm = &pl353_smc_dev_pm_ops,
},
.id_table = pl353_ids,
.probe = pl353_smc_probe,
.remove = pl353_smc_remove,
};
module_amba_driver(pl353_smc_driver);
MODULE_AUTHOR("Xilinx, Inc.");
MODULE_DESCRIPTION("ARM PL353 SMC Driver");
MODULE_LICENSE("GPL");