| // 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 = { |
| .start = 0xe000e000, |
| .end = 0xe000e000 + CHAM_HEADER_SIZE, |
| .flags = IORESOURCE_MEM, |
| }; |
| |
| static struct resource sc31_fpga_resource = { |
| .start = 0xf000e000, |
| .end = 0xf000e000 + 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, |
| }, |
| { |
| .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"); |