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73edc8f7cc
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>
159 lines
3.3 KiB
C
159 lines
3.3 KiB
C
/*
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* MEN Chameleon Bus.
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*
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* Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
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* Author: Andreas Werner <andreas.werner@men.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; version 2 of the License.
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*/
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/dmi.h>
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#include <linux/mcb.h>
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#include <linux/io.h>
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#include "mcb-internal.h"
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struct priv {
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struct mcb_bus *bus;
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struct resource *mem;
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void __iomem *base;
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};
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static int mcb_lpc_probe(struct platform_device *pdev)
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{
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struct resource *res;
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struct priv *priv;
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int ret = 0;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!priv->mem) {
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dev_err(&pdev->dev, "No Memory resource\n");
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return -ENODEV;
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}
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res = devm_request_mem_region(&pdev->dev, priv->mem->start,
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resource_size(priv->mem),
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KBUILD_MODNAME);
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if (!res) {
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dev_err(&pdev->dev, "Failed to request IO memory\n");
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return -EBUSY;
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}
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priv->base = devm_ioremap(&pdev->dev, priv->mem->start,
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resource_size(priv->mem));
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if (!priv->base) {
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dev_err(&pdev->dev, "Cannot ioremap\n");
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return -ENOMEM;
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}
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platform_set_drvdata(pdev, priv);
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priv->bus = mcb_alloc_bus(&pdev->dev);
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if (IS_ERR(priv->bus))
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return PTR_ERR(priv->bus);
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ret = chameleon_parse_cells(priv->bus, priv->mem->start, priv->base);
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if (ret < 0) {
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mcb_release_bus(priv->bus);
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return ret;
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}
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dev_dbg(&pdev->dev, "Found %d cells\n", ret);
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mcb_bus_add_devices(priv->bus);
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return 0;
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}
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static int mcb_lpc_remove(struct platform_device *pdev)
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{
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struct priv *priv = platform_get_drvdata(pdev);
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mcb_release_bus(priv->bus);
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return 0;
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}
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static struct platform_device *mcb_lpc_pdev;
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static int mcb_lpc_create_platform_device(const struct dmi_system_id *id)
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{
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struct resource *res = id->driver_data;
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int ret;
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mcb_lpc_pdev = platform_device_alloc("mcb-lpc", -1);
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if (!mcb_lpc_pdev)
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return -ENOMEM;
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ret = platform_device_add_resources(mcb_lpc_pdev, res, 1);
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if (ret)
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goto out_put;
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ret = platform_device_add(mcb_lpc_pdev);
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if (ret)
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goto out_put;
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return 0;
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out_put:
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platform_device_put(mcb_lpc_pdev);
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return ret;
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}
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static struct resource sc24_fpga_resource = {
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.start = 0xe000e000,
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.end = 0xe000e000 + CHAM_HEADER_SIZE,
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.flags = IORESOURCE_MEM,
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};
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static struct platform_driver mcb_lpc_driver = {
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.driver = {
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.name = "mcb-lpc",
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},
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.probe = mcb_lpc_probe,
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.remove = mcb_lpc_remove,
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};
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static const struct dmi_system_id mcb_lpc_dmi_table[] = {
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{
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.ident = "SC24",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "MEN"),
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DMI_MATCH(DMI_PRODUCT_VERSION, "14SC24"),
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},
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.driver_data = (void *)&sc24_fpga_resource,
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.callback = mcb_lpc_create_platform_device,
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},
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{}
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};
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MODULE_DEVICE_TABLE(dmi, mcb_lpc_dmi_table);
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static int __init mcb_lpc_init(void)
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{
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if (!dmi_check_system(mcb_lpc_dmi_table))
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return -ENODEV;
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return platform_driver_register(&mcb_lpc_driver);
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}
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static void __exit mcb_lpc_exit(void)
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{
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platform_device_unregister(mcb_lpc_pdev);
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platform_driver_unregister(&mcb_lpc_driver);
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}
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module_init(mcb_lpc_init);
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module_exit(mcb_lpc_exit);
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MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("MCB over LPC support");
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