diff options
Diffstat (limited to 'drivers/media/pci/mgb4/mgb4_regs.c')
| -rw-r--r-- | drivers/media/pci/mgb4/mgb4_regs.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/media/pci/mgb4/mgb4_regs.c b/drivers/media/pci/mgb4/mgb4_regs.c new file mode 100644 index 000000000000..53d4e4503a74 --- /dev/null +++ b/drivers/media/pci/mgb4/mgb4_regs.c @@ -0,0 +1,30 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2021-2022 Digiteq Automotive + * author: Martin Tuma <martin.tuma@digiteqautomotive.com> + */ + +#include <linux/ioport.h> +#include "mgb4_regs.h" + +int mgb4_regs_map(struct resource *res, struct mgb4_regs *regs) +{ + regs->mapbase = res->start; + regs->mapsize = res->end - res->start; + + if (!request_mem_region(regs->mapbase, regs->mapsize, res->name)) + return -EINVAL; + regs->membase = ioremap(regs->mapbase, regs->mapsize); + if (!regs->membase) { + release_mem_region(regs->mapbase, regs->mapsize); + return -EINVAL; + } + + return 0; +} + +void mgb4_regs_free(struct mgb4_regs *regs) +{ + iounmap(regs->membase); + release_mem_region(regs->mapbase, regs->mapsize); +} |