mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 15:20:53 +07:00
3d03137864
Driver needs ZynqMP firmware interface to call EEMI APIs. In case firmware is not ready, dependent drivers should wait until the firmware is ready. Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com> Signed-off-by: Jolly Shah <jollys@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
91 lines
2.0 KiB
C
91 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2019 Xilinx, Inc.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/nvmem-provider.h>
|
|
#include <linux/of.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/firmware/xlnx-zynqmp.h>
|
|
|
|
#define SILICON_REVISION_MASK 0xF
|
|
|
|
struct zynqmp_nvmem_data {
|
|
struct device *dev;
|
|
struct nvmem_device *nvmem;
|
|
};
|
|
|
|
static const struct zynqmp_eemi_ops *eemi_ops;
|
|
|
|
static int zynqmp_nvmem_read(void *context, unsigned int offset,
|
|
void *val, size_t bytes)
|
|
{
|
|
int ret;
|
|
int idcode, version;
|
|
struct zynqmp_nvmem_data *priv = context;
|
|
|
|
if (!eemi_ops->get_chipid)
|
|
return -ENXIO;
|
|
|
|
ret = eemi_ops->get_chipid(&idcode, &version);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
dev_dbg(priv->dev, "Read chipid val %x %x\n", idcode, version);
|
|
*(int *)val = version & SILICON_REVISION_MASK;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct nvmem_config econfig = {
|
|
.name = "zynqmp-nvmem",
|
|
.owner = THIS_MODULE,
|
|
.word_size = 1,
|
|
.size = 1,
|
|
.read_only = true,
|
|
};
|
|
|
|
static const struct of_device_id zynqmp_nvmem_match[] = {
|
|
{ .compatible = "xlnx,zynqmp-nvmem-fw", },
|
|
{ /* sentinel */ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, zynqmp_nvmem_match);
|
|
|
|
static int zynqmp_nvmem_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct zynqmp_nvmem_data *priv;
|
|
|
|
priv = devm_kzalloc(dev, sizeof(struct zynqmp_nvmem_data), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
eemi_ops = zynqmp_pm_get_eemi_ops();
|
|
if (IS_ERR(eemi_ops))
|
|
return PTR_ERR(eemi_ops);
|
|
|
|
priv->dev = dev;
|
|
econfig.dev = dev;
|
|
econfig.reg_read = zynqmp_nvmem_read;
|
|
econfig.priv = priv;
|
|
|
|
priv->nvmem = devm_nvmem_register(dev, &econfig);
|
|
|
|
return PTR_ERR_OR_ZERO(priv->nvmem);
|
|
}
|
|
|
|
static struct platform_driver zynqmp_nvmem_driver = {
|
|
.probe = zynqmp_nvmem_probe,
|
|
.driver = {
|
|
.name = "zynqmp-nvmem",
|
|
.of_match_table = zynqmp_nvmem_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(zynqmp_nvmem_driver);
|
|
|
|
MODULE_AUTHOR("Michal Simek <michal.simek@xilinx.com>, Nava kishore Manne <navam@xilinx.com>");
|
|
MODULE_DESCRIPTION("ZynqMP NVMEM driver");
|
|
MODULE_LICENSE("GPL");
|