mcb: Added support for LPC or non PCI based MCB carrier

Add support for MCB bases FPGAs connected to the LPC or
non PCI Bus.

This driver currently supports the SC24 board. The FPGA
is connected to the LPC bus and is identified using the BIOS
DMI string.

Signed-off-by: Andreas Werner <andreas.werner@men.de>
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andreas Werner 2016-08-26 09:34:57 +02:00 committed by Greg Kroah-Hartman
parent 4d31a2588a
commit 73edc8f7cc
3 changed files with 168 additions and 0 deletions

View File

@ -28,4 +28,13 @@ config MCB_PCI
If build as a module, the module is called mcb-pci.ko
config MCB_LPC
tristate "LPC (non PCI) based MCB carrier"
default n
help
This is a MCB carrier on a LPC or non PCI device.
If build as a module, the module is called mcb-lpc.ko
endif # MCB

View File

@ -5,3 +5,4 @@ mcb-y += mcb-core.o
mcb-y += mcb-parse.o
obj-$(CONFIG_MCB_PCI) += mcb-pci.o
obj-$(CONFIG_MCB_LPC) += mcb-lpc.o

158
drivers/mcb/mcb-lpc.c Normal file
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@ -0,0 +1,158 @@
/*
* MEN Chameleon Bus.
*
* Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
* Author: Andreas Werner <andreas.werner@men.de>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; version 2 of the License.
*/
#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;
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) {
mcb_release_bus(priv->bus);
return ret;
}
dev_dbg(&pdev->dev, "Found %d cells\n", ret);
mcb_bus_add_devices(priv->bus);
return 0;
}
static int mcb_lpc_remove(struct platform_device *pdev)
{
struct priv *priv = platform_get_drvdata(pdev);
mcb_release_bus(priv->bus);
return 0;
}
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 = {
.start = 0xe000e000,
.end = 0xe000e000 + CHAM_HEADER_SIZE,
.flags = IORESOURCE_MEM,
};
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,
},
{}
};
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");