add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/mcb/mcb-pci.c
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..
@@ -1,12 +1,9 @@
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+// 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: Johannes Thumshirn <johannes.thumshirn@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/module.h>
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@@ -34,7 +31,7 @@
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 {
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 	struct resource *res;
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 	struct priv *priv;
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-	int ret;
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+	int ret, table_size;
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 	unsigned long flags;
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 	priv = devm_kzalloc(&pdev->dev, sizeof(struct priv), GFP_KERNEL);
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@@ -93,7 +90,30 @@
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 	if (ret < 0)
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 		goto out_mcb_bus;
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-	dev_dbg(&pdev->dev, "Found %d cells\n", ret);
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+	table_size = ret;
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+
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+	if (table_size < CHAM_HEADER_SIZE) {
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+		/* Release the previous resources */
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+		devm_iounmap(&pdev->dev, priv->base);
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+		devm_release_mem_region(&pdev->dev, priv->mapbase, CHAM_HEADER_SIZE);
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+
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+		/* Then, allocate it again with the actual chameleon table size */
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+		res = devm_request_mem_region(&pdev->dev, priv->mapbase,
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+						table_size,
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+						KBUILD_MODNAME);
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+		if (!res) {
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+			dev_err(&pdev->dev, "Failed to request PCI memory\n");
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+			ret = -EBUSY;
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+			goto out_mcb_bus;
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+		}
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+
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+		priv->base = devm_ioremap(&pdev->dev, priv->mapbase, table_size);
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+		if (!priv->base) {
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+			dev_err(&pdev->dev, "Cannot ioremap\n");
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+			ret = -ENOMEM;
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+			goto out_mcb_bus;
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+		}
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+	}
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 	mcb_bus_add_devices(priv->bus);
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@@ -134,3 +154,4 @@
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 MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
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 MODULE_LICENSE("GPL");
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 MODULE_DESCRIPTION("MCB over PCI support");
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+MODULE_IMPORT_NS(MCB);