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path: root/drivers/mcb/mcb-lpc.c
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Diffstat (limited to 'drivers/mcb/mcb-lpc.c')
-rw-r--r--drivers/mcb/mcb-lpc.c189
1 files changed, 189 insertions, 0 deletions
diff --git a/drivers/mcb/mcb-lpc.c b/drivers/mcb/mcb-lpc.c
new file mode 100644
index 000000000..a851e0236
--- /dev/null
+++ b/drivers/mcb/mcb-lpc.c
@@ -0,0 +1,189 @@
+// 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 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 = 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);