[PATCH] ARM: 2792/1: IXP4xx iomap API implementation

Patch from Deepak Saxena

This patch implements the iomap API for Intel IXP4xx NPU systems.
We need to implement our own version of the API functions b/c of the
PCI hostbridge does not provide the capability to map PCI I/O space
into the CPU's physical memory space. In addition, if a system has
more than 64M of PCI memory mapped BARs, PCI memory must also be
accessed indirectly.  This patch changes the assignment of PCI I/O
resources to fall into to 0x0000:0xffff range so that we can trap
I/O areas in our ioread/iowrite macros.

Signed-off-by: Deepak Saxena
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 177 insertions, 3 deletions

diff --git a/arch/arm/mach-ixp4xx/common-pci.c b/arch/arm/mach-ixp4xx/common-pci.c
index aa92e3708838..2b544363c078 100644
--- a/arch/arm/mach-ixp4xx/common-pci.c
+++ b/arch/arm/mach-ixp4xx/common-pci.c
@@ -453,8 +453,8 @@ int ixp4xx_setup(int nr, struct pci_sys_data *sys)
         local_write_config(PCI_COMMAND, 2, PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
 
         res[0].name = "PCI I/O Space";
-        res[0].start = 0x00001000;
-        res[0].end = 0xffff0000;
+        res[0].start = 0x00000000;
+        res[0].end = 0x0000ffff;
         res[0].flags = IORESOURCE_IO;
 
         res[1].name = "PCI Memory Space";
diff --git a/include/asm-arm/arch-ixp4xx/io.h b/include/asm-arm/arch-ixp4xx/io.h
index c27b9d3079a7..7495026e2c18 100644
--- a/include/asm-arm/arch-ixp4xx/io.h
+++ b/include/asm-arm/arch-ixp4xx/io.h
@@ -3,7 +3,7 @@
  *
  * Author: Deepak Saxena <dsaxena@plexity.net>
  *
- * Copyright (C) 2002-2004  MontaVista Software, Inc.
+ * Copyright (C) 2002-2005  MontaVista Software, Inc.
  *
  * 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
@@ -383,6 +383,180 @@ __ixp4xx_insl(u32 io_addr, u32 *vaddr, u32 count)
                 *vaddr++ = inl(io_addr);
 }
 
+#define __is_io_address(p)      (((unsigned long)p >= 0x0) && \
+                                        ((unsigned long)p <= 0x0000ffff))
+static inline unsigned int
+__ixp4xx_ioread8(void __iomem *port)
+{
+        if (__is_io_address(port))
+                return  (unsigned int)__ixp4xx_inb((unsigned int)port);
+        else
+#ifndef CONFIG_IXP4XX_INDIRECT_PCI
+                return (unsigned int)__raw_readb((u32)port);
+#else
+                return (unsigned int)__ixp4xx_readb((u32)port);
+#endif
+}
+
+static inline void
+__ixp4xx_ioread8_rep(u32 port, u8 *vaddr, u32 count)
+{
+        if (__is_io_address(port))
+                __ixp4xx_insb(port, vaddr, count);
+        else
+#ifndef CONFIG_IXP4XX_INDIRECT_PCI
+                __raw_readsb((void __iomem *)port, vaddr, count);
+#else
+                __ixp4xx_readsb(port, vaddr, count);
+#endif
+}
+
+static inline unsigned int
+__ixp4xx_ioread16(void __iomem *port)
+{
+        if (__is_io_address(port))
+                return  (unsigned int)__ixp4xx_inw((unsigned int)port);
+        else
+#ifndef CONFIG_IXP4XX_INDIRECT_PCI
+                return le16_to_cpu(__raw_readw((u32)port));
+#else
+                return (unsigned int)__ixp4xx_readw((u32)port);
+#endif
+}
+
+static inline void
+__ixp4xx_ioread16_rep(u32 port, u16 *vaddr, u32 count)
+{
+        if (__is_io_address(port))
+                __ixp4xx_insw(port, vaddr, count);
+        else
+#ifndef CONFIG_IXP4XX_INDIRECT_PCI
+                __raw_readsw((void __iomem *)port, vaddr, count);
+#else
+                __ixp4xx_readsw(port, vaddr, count);
+#endif
+}
+
+static inline unsigned int
+__ixp4xx_ioread32(void __iomem *port)
+{
+        if (__is_io_address(port))
+                return  (unsigned int)__ixp4xx_inl((unsigned int)port);
+        else {
+#ifndef CONFIG_IXP4XX_INDIRECT_PCI
+                return le32_to_cpu(__raw_readl((u32)port));
+#else
+                return (unsigned int)__ixp4xx_readl((u32)port);
+#endif
+        }
+}
+
+static inline void
+__ixp4xx_ioread32_rep(u32 port, u32 *vaddr, u32 count)
+{
+        if (__is_io_address(port))
+                __ixp4xx_insl(port, vaddr, count);
+        else
+#ifndef CONFIG_IXP4XX_INDIRECT_PCI
+                __raw_readsl((void __iomem *)port, vaddr, count);
+#else
+                __ixp4xx_readsl(port, vaddr, count);
+#endif
+}
+
+static inline void
+__ixp4xx_iowrite8(u8 value, void __iomem *port)
+{
+        if (__is_io_address(port))
+                __ixp4xx_outb(value, (unsigned int)port);
+        else
+#ifndef CONFIG_IXP4XX_INDIRECT_PCI
+                __raw_writeb(value, (u32)port);
+#else
+                __ixp4xx_writeb(value, (u32)port);
+#endif
+}
+
+static inline void
+__ixp4xx_iowrite8_rep(u32 port, u8 *vaddr, u32 count)
+{
+        if (__is_io_address(port))
+                __ixp4xx_outsb(port, vaddr, count);
+#ifndef CONFIG_IXP4XX_INDIRECT_PCI
+                __raw_writesb((void __iomem *)port, vaddr, count);
+#else
+                __ixp4xx_writesb(port, vaddr, count);
+#endif
+}
+
+static inline void
+__ixp4xx_iowrite16(u16 value, void __iomem *port)
+{
+        if (__is_io_address(port))
+                __ixp4xx_outw(value, (unsigned int)port);
+        else
+#ifndef CONFIG_IXP4XX_INDIRECT_PCI
+                __raw_writew(cpu_to_le16(value), (u32)port);
+#else
+                __ixp4xx_writew(value, (u32)port);
+#endif
+}
+
+static inline void
+__ixp4xx_iowrite16_rep(u32 port, u16 *vaddr, u32 count)
+{
+        if (__is_io_address(port))
+                __ixp4xx_outsw(port, vaddr, count);
+#ifndef CONFIG_IXP4XX_INDIRECT_PCI
+                __raw_readsw((void __iomem *)port, vaddr, count);
+#else
+                __ixp4xx_writesw(port, vaddr, count);
+#endif
+}
+
+static inline void
+__ixp4xx_iowrite32(u32 value, void __iomem *port)
+{
+        if (__is_io_address(port))
+                __ixp4xx_outl(value, (unsigned int)port);
+        else
+#ifndef CONFIG_IXP4XX_INDIRECT_PCI
+                __raw_writel(cpu_to_le32(value), (u32)port);
+#else
+                __ixp4xx_writel(value, (u32)port);
+#endif
+}
+
+static inline void
+__ixp4xx_iowrite32_rep(u32 port, u32 *vaddr, u32 count)
+{
+        if (__is_io_address(port))
+                __ixp4xx_outsl(port, vaddr, count);
+#ifndef CONFIG_IXP4XX_INDIRECT_PCI
+                __raw_readsl((void __iomem *)port, vaddr, count);
+#else
+                __ixp4xx_outsl(port, vaddr, count);
+#endif
+}
+
+#define ioread8(p)                      __ixp4xx_ioread8(p)
+#define ioread16(p)                     __ixp4xx_ioread16(p)
+#define ioread32(p)                     __ixp4xx_ioread32(p)
+
+#define ioread8_rep(p, v, c)            __ixp4xx_ioread8_rep(p, v, c)
+#define ioread16_rep(p, v, c)           __ixp4xx_ioread16_rep(p, v, c)
+#define ioread32_rep(p, v, c)           __ixp4xx_ioread32_rep(p, v, c)
+
+#define iowrite8(v,p)                   __ixp4xx_iowrite8(v,p)
+#define iowrite16(v,p)                  __ixp4xx_iowrite16(v,p)
+#define iowrite32(v,p)                  __ixp4xx_iowrite32(v,p)
+
+#define iowrite8_rep(p, v, c)           __ixp4xx_iowrite8_rep(p, v, c)
+#define iowrite16_rep(p, v, c)          __ixp4xx_iowrite16_rep(p, v, c)
+#define iowrite32_rep(p, v, c)          __ixp4xx_iowrite32_rep(p, v, c)
+
+#define ioport_map(port, nr)            ((void __iomem*)port)
+#define ioport_unmap(addr)
 
 #endif  //  __ASM_ARM_ARCH_IO_H