From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/eisa/virtual_root.c | 72 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 drivers/eisa/virtual_root.c (limited to 'drivers/eisa/virtual_root.c') diff --git a/drivers/eisa/virtual_root.c b/drivers/eisa/virtual_root.c new file mode 100644 index 0000000000..37e6dd219c --- /dev/null +++ b/drivers/eisa/virtual_root.c @@ -0,0 +1,72 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Virtual EISA root driver. + * Acts as a placeholder if we don't have a proper EISA bridge. + * + * (C) 2003 Marc Zyngier + */ + +#include +#include +#include +#include +#include +#include + +#if defined(CONFIG_ALPHA_JENSEN) || defined(CONFIG_EISA_VLB_PRIMING) +#define EISA_FORCE_PROBE_DEFAULT 1 +#else +#define EISA_FORCE_PROBE_DEFAULT 0 +#endif + +static int force_probe = EISA_FORCE_PROBE_DEFAULT; +static void virtual_eisa_release (struct device *); + +/* The default EISA device parent (virtual root device). + * Now use a platform device, since that's the obvious choice. */ + +static struct platform_device eisa_root_dev = { + .name = "eisa", + .id = 0, + .dev = { + .release = virtual_eisa_release, + }, +}; + +static struct eisa_root_device eisa_bus_root = { + .dev = &eisa_root_dev.dev, + .bus_base_addr = 0, + .res = &ioport_resource, + .slots = EISA_MAX_SLOTS, + .dma_mask = 0xffffffff, +}; + +static void virtual_eisa_release (struct device *dev) +{ + /* nothing really to do here */ +} + +static int __init virtual_eisa_root_init (void) +{ + int r; + + if ((r = platform_device_register (&eisa_root_dev))) + return r; + + eisa_bus_root.force_probe = force_probe; + + dev_set_drvdata(&eisa_root_dev.dev, &eisa_bus_root); + + if (eisa_root_register (&eisa_bus_root)) { + /* A real bridge may have been registered before + * us. So quietly unregister. */ + platform_device_unregister (&eisa_root_dev); + return -1; + } + + return 0; +} + +module_param (force_probe, int, 0444); + +device_initcall (virtual_eisa_root_init); -- cgit v1.2.3