mcb: Added support for LPC or non PCI based MCB carrier (73edc8f7) · Commits · e / devices / android_kernel_xiaomi_nabu

drivers/mcb/Kconfig

+9 −0

Original line number	Diff line number	Diff line
		@@ -28,4 +28,13 @@ config MCB_PCI

		If build as a module, the module is called mcb-pci.ko

		config MCB_LPC
		tristate "LPC (non PCI) based MCB carrier"
		default n
		help

		This is a MCB carrier on a LPC or non PCI device.

		If build as a module, the module is called mcb-lpc.ko

		endif # MCB

drivers/mcb/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -5,3 +5,4 @@ mcb-y += mcb-core.o
		mcb-y += mcb-parse.o

		obj-$(CONFIG_MCB_PCI) += mcb-pci.o
		obj-$(CONFIG_MCB_LPC) += mcb-lpc.o

drivers/mcb/mcb-lpc.c

0 → 100644

+158 −0

Original line number	Diff line number	Diff line
		/*
		* 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");