Merge remote-tracking branch 'char-misc/char-misc-next'

[deliverable/linux.git] / drivers / mcb / mcb-lpc.c

diff --git a/drivers/mcb/mcb-lpc.c b/drivers/mcb/mcb-lpc.c
new file mode 100644 (file)
index 0000000..d072c08
--- /dev/null
+++ b/drivers/mcb/mcb-lpc.c
@@ -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");