lkml.org 
[lkml]   [2018]   [Jan]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v5 15/39] nds32: Device specific operations
Date
From: Greentime Hu <greentime@andestech.com>

This patch introduces ioremap implementations.

Signed-off-by: Vincent Chen <vincentc@andestech.com>
Signed-off-by: Greentime Hu <greentime@andestech.com>
---
arch/nds32/include/asm/io.h | 83 +++++++++++++++++++++++++++++++++++++++++++
arch/nds32/mm/ioremap.c | 62 ++++++++++++++++++++++++++++++++
2 files changed, 145 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..966e71b
--- /dev/null
+++ b/arch/nds32/include/asm/io.h
@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __ASM_NDS32_IO_H
+#define __ASM_NDS32_IO_H
+
+extern void iounmap(volatile void __iomem *addr);
+#define __raw_writeb __raw_writeb
+static inline void __raw_writeb(u8 val, volatile void __iomem *addr)
+{
+ asm volatile("sbi %0, [%1]" : : "r" (val), "r" (addr));
+}
+
+#define __raw_writew __raw_writew
+static inline void __raw_writew(u16 val, volatile void __iomem *addr)
+{
+ asm volatile("shi %0, [%1]" : : "r" (val), "r" (addr));
+}
+
+#define __raw_writel __raw_writel
+static inline void __raw_writel(u32 val, volatile void __iomem *addr)
+{
+ asm volatile("swi %0, [%1]" : : "r" (val), "r" (addr));
+}
+
+#define __raw_readb __raw_readb
+static inline u8 __raw_readb(const volatile void __iomem *addr)
+{
+ u8 val;
+
+ asm volatile("lbi %0, [%1]" : "=r" (val) : "r" (addr));
+ return val;
+}
+
+#define __raw_readw __raw_readw
+static inline u16 __raw_readw(const volatile void __iomem *addr)
+{
+ u16 val;
+
+ asm volatile("lhi %0, [%1]" : "=r" (val) : "r" (addr));
+ return val;
+}
+
+#define __raw_readl __raw_readl
+static inline u32 __raw_readl(const volatile void __iomem *addr)
+{
+ u32 val;
+
+ asm volatile("lwi %0, [%1]" : "=r" (val) : "r" (addr));
+ return val;
+}
+
+#define __iormb() rmb()
+#define __iowmb() wmb()
+
+#define mmiowb() __asm__ __volatile__ ("msync all" : : : "memory");
+
+/*
+ * {read,write}{b,w,l,q}_relaxed() are like the regular version, but
+ * are not guaranteed to provide ordering against spinlocks or memory
+ * accesses.
+ */
+
+#define readb_relaxed(c) ({ u8 __v = __raw_readb(c); __v; })
+#define readw_relaxed(c) ({ u16 __v = le16_to_cpu((__force __le16)__raw_readw(c)); __v; })
+#define readl_relaxed(c) ({ u32 __v = le32_to_cpu((__force __le32)__raw_readl(c)); __v; })
+#define writeb_relaxed(v,c) ((void)__raw_writeb((v),(c)))
+#define writew_relaxed(v,c) ((void)__raw_writew((__force u16)cpu_to_le16(v),(c)))
+#define writel_relaxed(v,c) ((void)__raw_writel((__force u32)cpu_to_le32(v),(c)))
+
+/*
+ * {read,write}{b,w,l,q}() access little endian memory and return result in
+ * native endianness.
+ */
+#define readb(c) ({ u8 __v = readb_relaxed(c); __iormb(); __v; })
+#define readw(c) ({ u16 __v = readw_relaxed(c); __iormb(); __v; })
+#define readl(c) ({ u32 __v = readl_relaxed(c); __iormb(); __v; })
+
+#define writeb(v,c) ({ __iowmb(); writeb_relaxed((v),(c)); })
+#define writew(v,c) ({ __iowmb(); writew_relaxed((v),(c)); })
+#define writel(v,c) ({ __iowmb(); writel_relaxed((v),(c)); })
+#include <asm-generic/io.h>
+#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..690140b
--- /dev/null
+++ b/arch/nds32/mm/ioremap.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#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(volatile void __iomem * addr)
+{
+ vunmap((void *)(PAGE_MASK & (unsigned long)addr));
+}
+
+EXPORT_SYMBOL(iounmap);
--
1.7.9.5
\
 
 \ /
  Last update: 2018-01-02 09:37    [W:0.153 / U:1.980 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site