From: Greentime Hu <greentime@xxxxxxxxxxxxx> This patch introduces ioremap implementations. Signed-off-by: Vincent Chen <vincentc@xxxxxxxxxxxxx> Signed-off-by: Greentime Hu <greentime@xxxxxxxxxxxxx> --- arch/nds32/include/asm/io.h | 25 +++++++++++++++ arch/nds32/mm/ioremap.c | 75 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 100 insertions(+) create mode 100644 arch/nds32/include/asm/io.h create mode 100644 arch/nds32/mm/ioremap.c diff --git a/arch/nds32/include/asm/io.h b/arch/nds32/include/asm/io.h new file mode 100644 index 0000000..b83dea1 --- /dev/null +++ b/arch/nds32/include/asm/io.h @@ -0,0 +1,25 @@ +/* + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __ASM_NDS32_IO_H +#define __ASM_NDS32_IO_H + +#ifdef __KERNEL__ +void iounmap(void __iomem * addr); +#include <asm-generic/io.h> + +#endif /* __KERNEL__ */ +#endif /* __ASM_NDS32_IO_H */ diff --git a/arch/nds32/mm/ioremap.c b/arch/nds32/mm/ioremap.c new file mode 100644 index 0000000..9b404eb --- /dev/null +++ b/arch/nds32/mm/ioremap.c @@ -0,0 +1,75 @@ +/* + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/vmalloc.h> +#include <linux/io.h> +#include <linux/mm.h> +#include <asm/pgtable.h> + +void __iomem *ioremap(phys_addr_t phys_addr, size_t size); + +static void __iomem *__ioremap_caller(phys_addr_t phys_addr, size_t size, + void *caller) +{ + struct vm_struct *area; + unsigned long addr, offset, last_addr; + pgprot_t prot; + + /* Don't allow wraparound or zero size */ + last_addr = phys_addr + size - 1; + if (!size || last_addr < phys_addr) + return NULL; + + /* + * Mappings have to be page-aligned + */ + offset = phys_addr & ~PAGE_MASK; + phys_addr &= PAGE_MASK; + size = PAGE_ALIGN(last_addr + 1) - phys_addr; + + /* + * Ok, go for it.. + */ + area = get_vm_area_caller(size, VM_IOREMAP, caller); + if (!area) + return NULL; + + area->phys_addr = phys_addr; + addr = (unsigned long)area->addr; + prot = __pgprot(_PAGE_V | _PAGE_M_KRW | _PAGE_D | + _PAGE_G | _PAGE_C_DEV); + if (ioremap_page_range(addr, addr + size, phys_addr, prot)) { + vunmap((void *)addr); + return NULL; + } + return (__force void __iomem *)(offset + (char *)addr); + +} + +void __iomem *ioremap(phys_addr_t phys_addr, size_t size) +{ + return __ioremap_caller(phys_addr, size, + __builtin_return_address(0)); +} + +EXPORT_SYMBOL(ioremap); + +void iounmap(void __iomem * addr) +{ + vunmap((void *)(PAGE_MASK & (unsigned long)addr)); +} + +EXPORT_SYMBOL(iounmap); -- 1.7.9.5
