Hexagon: Provide basic implementation and/or stubs for I/O routines.

Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
Signed-off-by: Linas Vepstas <linas@codeaurora.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 417 insertions, 0 deletions

diff --git a/arch/hexagon/include/asm/io.h b/arch/hexagon/include/asm/io.h
new file mode 100644
index 000000000000..b3acc2cc71bf
--- /dev/null
+++ b/arch/hexagon/include/asm/io.h
@@ -0,0 +1,326 @@
+/*
+ * IO definitions for the Hexagon architecture
+ *
+ * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#ifndef _ASM_IO_H
+#define _ASM_IO_H
+
+#ifdef __KERNEL__
+
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/vmalloc.h>
+#include <asm/string.h>
+#include <asm/mem-layout.h>
+#include <asm/iomap.h>
+#include <asm/page.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+
+/*
+ * We don't have PCI yet.
+ * _IO_BASE is pointing at what should be unused virtual space.
+ */
+#define IO_SPACE_LIMIT 0xffff
+#define _IO_BASE ((void __iomem *)0xfe000000)
+
+extern int remap_area_pages(unsigned long start, unsigned long phys_addr,
+                                unsigned long end, unsigned long flags);
+
+extern void __iounmap(const volatile void __iomem *addr);
+
+/* Defined in lib/io.c, needed for smc91x driver. */
+extern void __raw_readsw(const void __iomem *addr, void *data, int wordlen);
+extern void __raw_writesw(void __iomem *addr, const void *data, int wordlen);
+
+extern void __raw_readsl(const void __iomem *addr, void *data, int wordlen);
+extern void __raw_writesl(void __iomem *addr, const void *data, int wordlen);
+
+#define readsw(p, d, l) __raw_readsw(p, d, l)
+#define writesw(p, d, l) __raw_writesw(p, d, l)
+
+#define readsl(p, d, l)   __raw_readsl(p, d, l)
+#define writesl(p, d, l)  __raw_writesl(p, d, l)
+
+/*
+ * virt_to_phys - map virtual address to physical
+ * @address:  address to map
+ */
+static inline unsigned long virt_to_phys(volatile void *address)
+{
+        return __pa(address);
+}
+
+/*
+ * phys_to_virt - map physical address to virtual
+ * @address: address to map
+ */
+static inline void *phys_to_virt(unsigned long address)
+{
+        return __va(address);
+}
+
+/*
+ * convert a physical pointer to a virtual kernel pointer for
+ * /dev/mem access.
+ */
+#define xlate_dev_kmem_ptr(p)    __va(p)
+#define xlate_dev_mem_ptr(p)    __va(p)
+
+/*
+ * IO port access primitives.  Hexagon doesn't have special IO access
+ * instructions; all I/O is memory mapped.
+ *
+ * in/out are used for "ports", but we don't have "port instructions",
+ * so these are really just memory mapped too.
+ */
+
+/*
+ * readb - read byte from memory mapped device
+ * @addr:  pointer to memory
+ *
+ * Operates on "I/O bus memory space"
+ */
+static inline u8 readb(const volatile void __iomem *addr)
+{
+        u8 val;
+        asm volatile(
+                "%0 = memb(%1);"
+                : "=&r" (val)
+                : "r" (addr)
+        );
+        return val;
+}
+
+static inline u16 readw(const volatile void __iomem *addr)
+{
+        u16 val;
+        asm volatile(
+                "%0 = memh(%1);"
+                : "=&r" (val)
+                : "r" (addr)
+        );
+        return val;
+}
+
+static inline u32 readl(const volatile void __iomem *addr)
+{
+        u32 val;
+        asm volatile(
+                "%0 = memw(%1);"
+                : "=&r" (val)
+                : "r" (addr)
+        );
+        return val;
+}
+
+/*
+ * writeb - write a byte to a memory location
+ * @data: data to write to
+ * @addr:  pointer to memory
+ *
+ */
+static inline void writeb(u8 data, volatile void __iomem *addr)
+{
+        asm volatile(
+                "memb(%0) = %1;"
+                :
+                : "r" (addr), "r" (data)
+                : "memory"
+        );
+}
+
+static inline void writew(u16 data, volatile void __iomem *addr)
+{
+        asm volatile(
+                "memh(%0) = %1;"
+                :
+                : "r" (addr), "r" (data)
+                : "memory"
+        );
+
+}
+
+static inline void writel(u32 data, volatile void __iomem *addr)
+{
+        asm volatile(
+                "memw(%0) = %1;"
+                :
+                : "r" (addr), "r" (data)
+                : "memory"
+        );
+}
+
+#define __raw_writeb writeb
+#define __raw_writew writew
+#define __raw_writel writel
+
+#define __raw_readb readb
+#define __raw_readw readw
+#define __raw_readl readl
+
+/*
+ * Need an mtype somewhere in here, for cache type deals?
+ * This is probably too long for an inline.
+ */
+void __iomem *ioremap_nocache(unsigned long phys_addr, unsigned long size);
+
+static inline void __iomem *ioremap(unsigned long phys_addr, unsigned long size)
+{
+        return ioremap_nocache(phys_addr, size);
+}
+
+static inline void iounmap(volatile void __iomem *addr)
+{
+        __iounmap(addr);
+}
+
+#define __raw_writel writel
+
+static inline void memcpy_fromio(void *dst, const volatile void __iomem *src,
+        int count)
+{
+        memcpy(dst, (void *) src, count);
+}
+
+static inline void memcpy_toio(volatile void __iomem *dst, const void *src,
+        int count)
+{
+        memcpy((void *) dst, src, count);
+}
+
+#define PCI_IO_ADDR     (volatile void __iomem *)
+
+/*
+ * inb - read byte from I/O port or something
+ * @port:  address in I/O space
+ *
+ * Operates on "I/O bus I/O space"
+ */
+static inline u8 inb(unsigned long port)
+{
+        return readb(_IO_BASE + (port & IO_SPACE_LIMIT));
+}
+
+static inline u16 inw(unsigned long port)
+{
+        return readw(_IO_BASE + (port & IO_SPACE_LIMIT));
+}
+
+static inline u32 inl(unsigned long port)
+{
+        return readl(_IO_BASE + (port & IO_SPACE_LIMIT));
+}
+
+/*
+ * outb - write a byte to a memory location
+ * @data: data to write to
+ * @addr:  address in I/O space
+ */
+static inline void outb(u8 data, unsigned long port)
+{
+        writeb(data, _IO_BASE + (port & IO_SPACE_LIMIT));
+}
+
+static inline void outw(u16 data, unsigned long port)
+{
+        writew(data, _IO_BASE + (port & IO_SPACE_LIMIT));
+}
+
+static inline void outl(u32 data, unsigned long port)
+{
+        writel(data, _IO_BASE + (port & IO_SPACE_LIMIT));
+}
+
+#define outb_p outb
+#define outw_p outw
+#define outl_p outl
+
+#define inb_p inb
+#define inw_p inw
+#define inl_p inl
+
+static inline void insb(unsigned long port, void *buffer, int count)
+{
+        if (count) {
+                u8 *buf = buffer;
+                do {
+                        u8 x = inb(port);
+                        *buf++ = x;
+                } while (--count);
+        }
+}
+
+static inline void insw(unsigned long port, void *buffer, int count)
+{
+        if (count) {
+                u16 *buf = buffer;
+                do {
+                        u16 x = inw(port);
+                        *buf++ = x;
+                } while (--count);
+        }
+}
+
+static inline void insl(unsigned long port, void *buffer, int count)
+{
+        if (count) {
+                u32 *buf = buffer;
+                do {
+                        u32 x = inw(port);
+                        *buf++ = x;
+                } while (--count);
+        }
+}
+
+static inline void outsb(unsigned long port, const void *buffer, int count)
+{
+        if (count) {
+                const u8 *buf = buffer;
+                do {
+                        outb(*buf++, port);
+                } while (--count);
+        }
+}
+
+static inline void outsw(unsigned long port, const void *buffer, int count)
+{
+        if (count) {
+                const u16 *buf = buffer;
+                do {
+                        outw(*buf++, port);
+                } while (--count);
+        }
+}
+
+static inline void outsl(unsigned long port, const void *buffer, int count)
+{
+        if (count) {
+                const u32 *buf = buffer;
+                do {
+                        outl(*buf++, port);
+                } while (--count);
+        }
+}
+
+#define flush_write_buffers() do { } while (0)
+
+#endif /* __KERNEL__ */
+
+#endif
diff --git a/arch/hexagon/lib/io.c b/arch/hexagon/lib/io.c
new file mode 100644
index 000000000000..8ae47ba0e705
--- /dev/null
+++ b/arch/hexagon/lib/io.c
@@ -0,0 +1,91 @@
+/*
+ * I/O access functions for Hexagon
+ *
+ * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include <asm/io.h>
+
+/*  These are all FIFO routines!  */
+
+/*
+ * __raw_readsw - read words a short at a time
+ * @addr:  source address
+ * @data:  data address
+ * @len: number of shorts to read
+ */
+void __raw_readsw(const void __iomem *addr, void *data, int len)
+{
+        const volatile short int *src = (short int *) addr;
+        short int *dst = (short int *) data;
+
+        if ((u32)data & 0x1)
+                panic("unaligned pointer to readsw");
+
+        while (len-- > 0)
+                *dst++ = *src;
+
+}
+
+/*
+ * __raw_writesw - read words a short at a time
+ * @addr:  source address
+ * @data:  data address
+ * @len: number of shorts to read
+ */
+void __raw_writesw(void __iomem *addr, const void *data, int len)
+{
+        const short int *src = (short int *)data;
+        volatile short int *dst = (short int *)addr;
+
+        if ((u32)data & 0x1)
+                panic("unaligned pointer to writesw");
+
+        while (len-- > 0)
+                *dst = *src++;
+
+
+}
+
+/*  Pretty sure len is pre-adjusted for the length of the access already */
+void __raw_readsl(const void __iomem *addr, void *data, int len)
+{
+        const volatile long *src = (long *) addr;
+        long *dst = (long *) data;
+
+        if ((u32)data & 0x3)
+                panic("unaligned pointer to readsl");
+
+        while (len-- > 0)
+                *dst++ = *src;
+
+
+}
+
+void __raw_writesl(void __iomem *addr, const void *data, int len)
+{
+        const long *src = (long *)data;
+        volatile long *dst = (long *)addr;
+
+        if ((u32)data & 0x3)
+                panic("unaligned pointer to writesl");
+
+        while (len-- > 0)
+                *dst = *src++;
+
+
+}