[patch v3 24/36] Hexagon: Provide basic implementation and/or stubs for I/O routines.

Richard Kuo
2011-09-09T01:11:29Z

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Filled in the ins/outs; leaving them in for now.

Change _IO_BASE and IO_SPACE_LIMIT for safety.

I have compiled this with sparse and it builds; I've also picked over
various files related to the HAS_IOPORT_MAP from arm-soc.git and
tried them out, and they work, so I guess we'll just wait until
they're merged.

Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
Signed-off-by: Linas Vepstas <linas@codeaurora.org>

---
arch/hexagon/include/asm/io.h | 323 ++++++++++++++++++++++++++++++++++++++++++
arch/hexagon/lib/io.c | 91 +++++++++++
2 files changed, 414 insertions(+)

Index: linux-hexagon-kernel/arch/hexagon/include/asm/io.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-hexagon-kernel/arch/hexagon/include/asm/io.h 2011-09-07 13:00:30.910646758 -0500
@@ -0,0 +1,323 @@
+/*
+ * 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)
+ );
+}
+
+static inline void writew(u16 data, volatile void __iomem *addr)
+{
+ asm volatile(
+ "memh(%0) = %1;"
+ :
+ : "r" (addr), "r" (data)
+ );
+
+}
+
+static inline void writel(u32 data, volatile void __iomem *addr)
+{
+ asm volatile(
+ "memw(%0) = %1;"
+ :
+ : "r" (addr), "r" (data)
+ );
+}
+
+#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
Index: linux-hexagon-kernel/arch/hexagon/lib/io.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-hexagon-kernel/arch/hexagon/lib/io.c 2011-09-03 20:14:59.734981419 -0500
@@ -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++;
+
+
+}