172 lines
3.6 KiB
C
172 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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 resource sc31_fpga_resource = {
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.start = 0xf000e000,
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.end = 0xf000e000 + 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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.ident = "SC31",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "MEN"),
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DMI_MATCH(DMI_PRODUCT_VERSION, "14SC31"),
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},
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.driver_data = (void *)&sc31_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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MODULE_IMPORT_NS(MCB);
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