[PATCH 12/31] nds32: Device specific operations

From: Greentime Hu
Date: Wed Nov 08 2017 - 01:26:45 EST


From: Greentime Hu <greentime@xxxxxxxxxxxxx>

Signed-off-by: Vincent Chen <vincentc@xxxxxxxxxxxxx>
Signed-off-by: Greentime Hu <greentime@xxxxxxxxxxxxx>
---
arch/nds32/include/asm/io.h | 33 +++++++++++++++++++++
arch/nds32/mm/ioremap.c | 67 +++++++++++++++++++++++++++++++++++++++++++
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..98b3ae9
--- /dev/null
+++ b/arch/nds32/include/asm/io.h
@@ -0,0 +1,33 @@
+/*
+ * 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__
+
+#include <asm-generic/iomap.h>
+extern void __iomem *__ioremap(unsigned long, size_t, unsigned long,
+ unsigned long);
+extern void __iounmap(void __iomem * addr);
+
+#define ioremap(cookie,size) __ioremap(cookie,size,0,1)
+#define ioremap_nocache(cookie,size) __ioremap(cookie,size,0,1)
+#define iounmap(cookie) __iounmap(cookie)
+#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..532e6cf
--- /dev/null
+++ b/arch/nds32/mm/ioremap.c
@@ -0,0 +1,67 @@
+/*
+ * 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(unsigned long phys_addr, size_t size,
+ unsigned long flags, unsigned long align)
+{
+ 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(size, VM_IOREMAP);
+ 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);
+
+}
+
+EXPORT_SYMBOL(__ioremap);
+
+void __iounmap(void __iomem * addr)
+{
+ vunmap((void *)(PAGE_MASK & (unsigned long)addr));
+}
+
+EXPORT_SYMBOL(__iounmap);
--
1.7.9.5