linux-stable/drivers/memory/pl353-smc.c
Olof Johansson 361aa4be70 Memory controller drivers for v5.14 - PL353
Bigger work around ARM Primecell PL35x SMC memory controller driver by
 Miquel Raynal built on previous series from Naga Sureshkumar Relli.
 
 This includes bindings cleanup and correction, converting these to
 dtschema and several cleanyps in pl353-smc driver.
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Merge tag 'memory-controller-drv-pl353-5.14' of https://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux-mem-ctrl into arm/drivers

Memory controller drivers for v5.14 - PL353

Bigger work around ARM Primecell PL35x SMC memory controller driver by
Miquel Raynal built on previous series from Naga Sureshkumar Relli.

This includes bindings cleanup and correction, converting these to
dtschema and several cleanyps in pl353-smc driver.

* tag 'memory-controller-drv-pl353-5.14' of https://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux-mem-ctrl:
  dt-binding: memory: pl353-smc: Convert to yaml
  MAINTAINERS: Add PL353 SMC entry
  memory: pl353-smc: Declare variables following a reverse christmas tree order
  memory: pl353-smc: Avoid useless acronyms in descriptions
  memory: pl353-smc: Let lower level controller drivers handle inits
  memory: pl353-smc: Rename goto labels
  memory: pl353-smc: Fix style
  dt-binding: memory: pl353-smc: Fix the NAND controller node in the example
  dt-binding: memory: pl353-smc: Drop unsupported nodes from the example
  dt-binding: memory: pl353-smc: Fix the example syntax and style
  dt-binding: memory: pl353-smc: Describe the child reg property
  dt-binding: memory: pl353-smc: Drop the partitioning section
  dt-binding: memory: pl353-smc: Document the range property
  dt-binding: memory: pl353-smc: Rephrase the binding

Link: https://lore.kernel.org/r/20210611140659.61980-2-krzysztof.kozlowski@canonical.com
Signed-off-by: Olof Johansson <olof@lixom.net>
2021-06-12 08:53:06 -07:00

168 lines
3.7 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_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);
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");