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// SPDX-License-Identifier: GPL-2.0-only
/*
* MEN Chameleon Bus.
*
* Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
* Author: Andreas Werner <andreas.werner@men.de>
*/
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/dmi.h>
#include <linux/mcb.h>
#include <linux/io.h>
#include "mcb-internal.h"
struct priv {
struct mcb_bus *bus;
struct resource *mem;
void __iomem *base;
};
static int mcb_lpc_probe(struct platform_device *pdev)
{
struct resource *res;
struct priv *priv;
int ret = 0, table_size;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!priv->mem) {
dev_err(&pdev->dev, "No Memory resource\n");
return -ENODEV;
}
res = devm_request_mem_region(&pdev->dev, priv->mem->start,
resource_size(priv->mem),
KBUILD_MODNAME);
if (!res) {
dev_err(&pdev->dev, "Failed to request IO memory\n");
return -EBUSY;
}
priv->base = devm_ioremap(&pdev->dev, priv->mem->start,
resource_size(priv->mem));
if (!priv->base) {
dev_err(&pdev->dev, "Cannot ioremap\n");
return -ENOMEM;
}
platform_set_drvdata(pdev, priv);
priv->bus = mcb_alloc_bus(&pdev->dev);
if (IS_ERR(priv->bus))
return PTR_ERR(priv->bus);
ret = chameleon_parse_cells(priv->bus, priv->mem->start, priv->base);
if (ret < 0) {
goto out_mcb_bus;
}
table_size = ret;
if (table_size < CHAM_HEADER_SIZE) {
/* Release the previous resources */
devm_iounmap(&pdev->dev, priv->base);
devm_release_mem_region(&pdev->dev, priv->mem->start, resource_size(priv->mem));
/* Then, allocate it again with the actual chameleon table size */
res = devm_request_mem_region(&pdev->dev, priv->mem->start,
table_size,
KBUILD_MODNAME);
if (!res) {
dev_err(&pdev->dev, "Failed to request PCI memory\n");
ret = -EBUSY;
goto out_mcb_bus;
}
priv->base = devm_ioremap(&pdev->dev, priv->mem->start, table_size);
if (!priv->base) {
dev_err(&pdev->dev, "Cannot ioremap\n");
ret = -ENOMEM;
goto out_mcb_bus;
}
platform_set_drvdata(pdev, priv);
}
mcb_bus_add_devices(priv->bus);
return 0;
out_mcb_bus:
mcb_release_bus(priv->bus);
return ret;
}
static void mcb_lpc_remove(struct platform_device *pdev)
{
struct priv *priv = platform_get_drvdata(pdev);
mcb_release_bus(priv->bus);
}
static struct platform_device *mcb_lpc_pdev;
static int mcb_lpc_create_platform_device(const struct dmi_system_id *id)
{
struct resource *res = id->driver_data;
int ret;
mcb_lpc_pdev = platform_device_alloc("mcb-lpc", -1);
if (!mcb_lpc_pdev)
return -ENOMEM;
ret = platform_device_add_resources(mcb_lpc_pdev, res, 1);
if (ret)
goto out_put;
ret = platform_device_add(mcb_lpc_pdev);
if (ret)
goto out_put;
return 0;
out_put:
platform_device_put(mcb_lpc_pdev);
return ret;
}
static struct resource sc24_fpga_resource = DEFINE_RES_MEM(0xe000e000, CHAM_HEADER_SIZE);
static struct resource sc31_fpga_resource = DEFINE_RES_MEM(0xf000e000, CHAM_HEADER_SIZE);
static struct platform_driver mcb_lpc_driver = {
.driver = {
.name = "mcb-lpc",
},
.probe = mcb_lpc_probe,
.remove = mcb_lpc_remove,
};
static const struct dmi_system_id mcb_lpc_dmi_table[] = {
{
.ident = "SC24",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "MEN"),
DMI_MATCH(DMI_PRODUCT_VERSION, "14SC24"),
},
.driver_data = (void *)&sc24_fpga_resource,
.callback = mcb_lpc_create_platform_device,
},
{
.ident = "SC31",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "MEN"),
DMI_MATCH(DMI_PRODUCT_VERSION, "14SC31"),
},
.driver_data = (void *)&sc31_fpga_resource,
.callback = mcb_lpc_create_platform_device,
},
{}
};
MODULE_DEVICE_TABLE(dmi, mcb_lpc_dmi_table);
static int __init mcb_lpc_init(void)
{
if (!dmi_check_system(mcb_lpc_dmi_table))
return -ENODEV;
return platform_driver_register(&mcb_lpc_driver);
}
static void __exit mcb_lpc_exit(void)
{
platform_device_unregister(mcb_lpc_pdev);
platform_driver_unregister(&mcb_lpc_driver);
}
module_init(mcb_lpc_init);
module_exit(mcb_lpc_exit);
MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MCB over LPC support");
MODULE_IMPORT_NS("MCB");
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