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authorDaniel Hellstrom <daniel@gaisler.com>2008-03-28 09:47:00 +0100
committerDaniel Hellstrom <daniel@gaisler.com>2008-04-08 07:58:32 +0000
commitc2f02da21a3f37f0878554eebc785e04fdc4e128 (patch)
tree169e423067d8298e0568ff7b13c5419185008b38 /include/asm-sparc/io.h
parentaeff6d503b6006573d5c6b04fc658a64bebee5fa (diff)
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SPARC: Added generic support for SPARC architecture.
Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
Diffstat (limited to 'include/asm-sparc/io.h')
-rw-r--r--include/asm-sparc/io.h94
1 files changed, 94 insertions, 0 deletions
diff --git a/include/asm-sparc/io.h b/include/asm-sparc/io.h
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+++ b/include/asm-sparc/io.h
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+/* SPARC I/O definitions
+ *
+ * (C) Copyright 2007
+ * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+#ifndef _SPARC_IO_H
+#define _SPARC_IO_H
+
+/* Nothing to sync, total store ordering (TSO)... */
+#define sync()
+
+/* Forces a cache miss on read/load.
+ * On some architectures we need to bypass the cache when reading
+ * I/O registers so that we are not reading the same status word
+ * over and over again resulting in a hang (until an IRQ if lucky)
+ *
+ */
+#ifndef CFG_HAS_NO_CACHE
+#define READ_BYTE(var) SPARC_NOCACHE_READ_BYTE((unsigned int)(var))
+#define READ_HWORD(var) SPARC_NOCACHE_READ_HWORD((unsigned int)(var))
+#define READ_WORD(var) SPARC_NOCACHE_READ((unsigned int)(var))
+#define READ_DWORD(var) SPARC_NOCACHE_READ_DWORD((unsigned int)(var))
+#else
+#define READ_BYTE(var) (var)
+#define READ_HWORD(var) (var)
+#define READ_WORD(var) (var)
+#define READ_DWORD(var) (var)
+#endif
+
+/*
+ * Generic virtual read/write.
+ */
+#define __arch_getb(a) (READ_BYTE(a))
+#define __arch_getw(a) (READ_HWORD(a))
+#define __arch_getl(a) (READ_WORD(a))
+#define __arch_getq(a) (READ_DWORD(a))
+
+#define __arch_putb(v,a) (*(volatile unsigned char *)(a) = (v))
+#define __arch_putw(v,a) (*(volatile unsigned short *)(a) = (v))
+#define __arch_putl(v,a) (*(volatile unsigned int *)(a) = (v))
+
+#define __raw_writeb(v,a) __arch_putb(v,a)
+#define __raw_writew(v,a) __arch_putw(v,a)
+#define __raw_writel(v,a) __arch_putl(v,a)
+
+#define __raw_readb(a) __arch_getb(a)
+#define __raw_readw(a) __arch_getw(a)
+#define __raw_readl(a) __arch_getl(a)
+#define __raw_readq(a) __arch_getq(a)
+
+/*
+ * Given a physical address and a length, return a virtual address
+ * that can be used to access the memory range with the caching
+ * properties specified by "flags".
+ */
+typedef unsigned long phys_addr_t;
+
+#define MAP_NOCACHE (0)
+#define MAP_WRCOMBINE (0)
+#define MAP_WRBACK (0)
+#define MAP_WRTHROUGH (0)
+
+static inline void *map_physmem(phys_addr_t paddr, unsigned long len,
+ unsigned long flags)
+{
+ return (void *)paddr;
+}
+
+/*
+ * Take down a mapping set up by map_physmem().
+ */
+static inline void unmap_physmem(void *vaddr, unsigned long flags)
+{
+
+}
+
+#endif