[MIPS] Iomap implementation.

This implementation has support for the concept of one separate ioport
address space by PCI domain.  A pointer to the virtual address where
the port space of a domain has been mapped has been added to struct
pci_controller and systems should be fixed to fill in this value. For
single domain systems this will be the same value as passed to
set_io_port_base().

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

3 files changed, 277 insertions, 53 deletions

diff --git a/arch/mips/lib/Makefile b/arch/mips/lib/Makefile
index 5ad501b30b43..9e5d985936b3 100644
--- a/arch/mips/lib/Makefile
+++ b/arch/mips/lib/Makefile
@@ -5,7 +5,8 @@
 lib-y   += csum_partial.o memcpy.o memset.o promlib.o \
            strlen_user.o strncpy_user.o strnlen_user.o uncached.o
 
-obj-y   += iomap.o
+obj-y                   += iomap.o
+obj-$(CONFIG_PCI)       += iomap-pci.o
 
 # libgcc-style stuff needed in the kernel
 lib-y += ashldi3.o ashrdi3.o lshrdi3.o
diff --git a/arch/mips/lib/iomap-pci.c b/arch/mips/lib/iomap-pci.c
new file mode 100644
index 000000000000..c11b2494bb6e
--- /dev/null
+++ b/arch/mips/lib/iomap-pci.c
@@ -0,0 +1,74 @@
+/*
+ * Implement the default iomap interfaces
+ *
+ * (C) Copyright 2004 Linus Torvalds
+ * (C) Copyright 2006 Ralf Baechle <ralf@linux-mips.org>
+ * (C) Copyright 2007 MIPS Technologies, Inc.
+ *     written by Ralf Baechle <ralf@linux-mips.org>
+ */
+#include <linux/pci.h>
+#include <linux/module.h>
+#include <asm/io.h>
+
+static void __iomem *ioport_map_pci(struct pci_dev *dev,
+                                     unsigned long port, unsigned int nr)
+{
+        struct pci_controller *ctrl = dev->bus->sysdata;
+        unsigned long base = ctrl->io_map_base;
+
+        /* This will eventually become a BUG_ON but for now be gentle */
+        if (unlikely(!ctrl->io_map_base)) {
+                struct pci_bus *bus = dev->bus;
+                char name[8];
+
+                while (bus->parent)
+                        bus = bus->parent;
+
+                ctrl->io_map_base = base = mips_io_port_base;
+
+                sprintf(name, "%04x:%02x", pci_domain_nr(bus), bus->number);
+                printk(KERN_WARNING "io_map_base of root PCI bus %s unset.  "
+                       "Trying to continue but you better\nfix this issue or "
+                       "report it to linux-mips@linux-mips.org or your "
+                       "vendor.\n", name);
+#ifdef CONFIG_PCI_DOMAINS
+                panic("To avoid data corruption io_map_base MUST be set with "
+                      "multiple PCI domains.");
+#endif
+        }
+
+        return (void __iomem *) (ctrl->io_map_base + port);
+}
+
+/*
+ * Create a virtual mapping cookie for a PCI BAR (memory or IO)
+ */
+void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
+{
+        unsigned long start = pci_resource_start(dev, bar);
+        unsigned long len = pci_resource_len(dev, bar);
+        unsigned long flags = pci_resource_flags(dev, bar);
+
+        if (!len || !start)
+                return NULL;
+        if (maxlen && len > maxlen)
+                len = maxlen;
+        if (flags & IORESOURCE_IO)
+                return ioport_map_pci(dev, start, len);
+        if (flags & IORESOURCE_MEM) {
+                if (flags & IORESOURCE_CACHEABLE)
+                        return ioremap(start, len);
+                return ioremap_nocache(start, len);
+        }
+        /* What? */
+        return NULL;
+}
+
+EXPORT_SYMBOL(pci_iomap);
+
+void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
+{
+        iounmap(addr);
+}
+
+EXPORT_SYMBOL(pci_iounmap);
diff --git a/arch/mips/lib/iomap.c b/arch/mips/lib/iomap.c
index f4ac5bbcd81f..d51d5cb0a4a9 100644
--- a/arch/mips/lib/iomap.c
+++ b/arch/mips/lib/iomap.c
@@ -1,78 +1,227 @@
 /*
- *  iomap.c, Memory Mapped I/O routines for MIPS architecture.
+ * Implement the default iomap interfaces
  *
- *  This code is based on lib/iomap.c, by Linus Torvalds.
- *
- *  Copyright (C) 2004-2005  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
- *
- *  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.
+ * (C) Copyright 2004 Linus Torvalds
+ * (C) Copyright 2006 Ralf Baechle <ralf@linux-mips.org>
+ * (C) Copyright 2007 MIPS Technologies, Inc.
+ *     written by Ralf Baechle <ralf@linux-mips.org>
+ */
+#include <linux/pci.h>
+#include <linux/module.h>
+#include <asm/io.h>
+
+/*
+ * Read/write from/to an (offsettable) iomem cookie. It might be a PIO
+ * access or a MMIO access, these functions don't care. The info is
+ * encoded in the hardware mapping set up by the mapping functions
+ * (or the cookie itself, depending on implementation and hw).
  *
- *  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.
+ * The generic routines don't assume any hardware mappings, and just
+ * encode the PIO/MMIO as part of the cookie. They coldly assume that
+ * the MMIO IO mappings are not in the low address range.
  *
- *  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
+ * Architectures for which this is not true can't use this generic
+ * implementation and should do their own copy.
  */
-#include <linux/ioport.h>
-#include <linux/module.h>
-#include <linux/pci.h>
 
-#include <asm/io.h>
+#define PIO_MASK        0x0ffffUL
 
-void __iomem *ioport_map(unsigned long port, unsigned int nr)
+unsigned int ioread8(void __iomem *addr)
 {
-        unsigned long end;
+        return readb(addr);
+}
 
-        end = port + nr - 1UL;
-        if (ioport_resource.start > port ||
-            ioport_resource.end < end || port > end)
-                return NULL;
+EXPORT_SYMBOL(ioread8);
 
-        return (void __iomem *)(mips_io_port_base + port);
+unsigned int ioread16(void __iomem *addr)
+{
+        return readw(addr);
 }
 
-void ioport_unmap(void __iomem *addr)
+EXPORT_SYMBOL(ioread16);
+
+unsigned int ioread16be(void __iomem *addr)
 {
+        return be16_to_cpu(__raw_readw(addr));
 }
-EXPORT_SYMBOL(ioport_map);
-EXPORT_SYMBOL(ioport_unmap);
 
-void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
+EXPORT_SYMBOL(ioread16be);
+
+unsigned int ioread32(void __iomem *addr)
 {
-        unsigned long start, len, flags;
+        return readl(addr);
+}
 
-        if (dev == NULL)
-                return NULL;
+EXPORT_SYMBOL(ioread32);
 
-        start = pci_resource_start(dev, bar);
-        len = pci_resource_len(dev, bar);
-        if (!start || !len)
-                return NULL;
+unsigned int ioread32be(void __iomem *addr)
+{
+        return be32_to_cpu(__raw_readl(addr));
+}
 
-        if (maxlen != 0 && len > maxlen)
-                len = maxlen;
+EXPORT_SYMBOL(ioread32be);
+
+void iowrite8(u8 val, void __iomem *addr)
+{
+        writeb(val, addr);
+}
 
-        flags = pci_resource_flags(dev, bar);
-        if (flags & IORESOURCE_IO)
-                return ioport_map(start, len);
-        if (flags & IORESOURCE_MEM) {
-                if (flags & IORESOURCE_CACHEABLE)
-                        return ioremap_cachable(start, len);
-                return ioremap_nocache(start, len);
+EXPORT_SYMBOL(iowrite8);
+
+void iowrite16(u16 val, void __iomem *addr)
+{
+        writew(val, addr);
+}
+
+EXPORT_SYMBOL(iowrite16);
+
+void iowrite16be(u16 val, void __iomem *addr)
+{
+        __raw_writew(cpu_to_be16(val), addr);
+}
+
+EXPORT_SYMBOL(iowrite16be);
+
+void iowrite32(u32 val, void __iomem *addr)
+{
+        writel(val, addr);
+}
+
+EXPORT_SYMBOL(iowrite32);
+
+void iowrite32be(u32 val, void __iomem *addr)
+{
+        __raw_writel(cpu_to_be32(val), addr);
+}
+
+EXPORT_SYMBOL(iowrite32be);
+
+/*
+ * These are the "repeat MMIO read/write" functions.
+ * Note the "__raw" accesses, since we don't want to
+ * convert to CPU byte order. We write in "IO byte
+ * order" (we also don't have IO barriers).
+ */
+static inline void mmio_insb(void __iomem *addr, u8 *dst, int count)
+{
+        while (--count >= 0) {
+                u8 data = __raw_readb(addr);
+                *dst = data;
+                dst++;
         }
+}
 
-        return NULL;
+static inline void mmio_insw(void __iomem *addr, u16 *dst, int count)
+{
+        while (--count >= 0) {
+                u16 data = __raw_readw(addr);
+                *dst = data;
+                dst++;
+        }
 }
 
-void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
+static inline void mmio_insl(void __iomem *addr, u32 *dst, int count)
 {
-        iounmap(addr);
+        while (--count >= 0) {
+                u32 data = __raw_readl(addr);
+                *dst = data;
+                dst++;
+        }
 }
-EXPORT_SYMBOL(pci_iomap);
-EXPORT_SYMBOL(pci_iounmap);
+
+static inline void mmio_outsb(void __iomem *addr, const u8 *src, int count)
+{
+        while (--count >= 0) {
+                __raw_writeb(*src, addr);
+                src++;
+        }
+}
+
+static inline void mmio_outsw(void __iomem *addr, const u16 *src, int count)
+{
+        while (--count >= 0) {
+                __raw_writew(*src, addr);
+                src++;
+        }
+}
+
+static inline void mmio_outsl(void __iomem *addr, const u32 *src, int count)
+{
+        while (--count >= 0) {
+                __raw_writel(*src, addr);
+                src++;
+        }
+}
+
+void ioread8_rep(void __iomem *addr, void *dst, unsigned long count)
+{
+        mmio_insb(addr, dst, count);
+}
+
+EXPORT_SYMBOL(ioread8_rep);
+
+void ioread16_rep(void __iomem *addr, void *dst, unsigned long count)
+{
+        mmio_insw(addr, dst, count);
+}
+
+EXPORT_SYMBOL(ioread16_rep);
+
+void ioread32_rep(void __iomem *addr, void *dst, unsigned long count)
+{
+        mmio_insl(addr, dst, count);
+}
+
+EXPORT_SYMBOL(ioread32_rep);
+
+void iowrite8_rep(void __iomem *addr, const void *src, unsigned long count)
+{
+        mmio_outsb(addr, src, count);
+}
+
+EXPORT_SYMBOL(iowrite8_rep);
+
+void iowrite16_rep(void __iomem *addr, const void *src, unsigned long count)
+{
+        mmio_outsw(addr, src, count);
+}
+
+EXPORT_SYMBOL(iowrite16_rep);
+
+void iowrite32_rep(void __iomem *addr, const void *src, unsigned long count)
+{
+        mmio_outsl(addr, src, count);
+}
+
+EXPORT_SYMBOL(iowrite32_rep);
+
+/*
+ * Create a virtual mapping cookie for an IO port range
+ *
+ * This uses the same mapping are as the in/out family which has to be setup
+ * by the platform initialization code.
+ *
+ * Just to make matters somewhat more interesting on MIPS systems with
+ * multiple host bridge each will have it's own ioport address space.
+ */
+static void __iomem *ioport_map_legacy(unsigned long port, unsigned int nr)
+{
+        return (void __iomem *) (mips_io_port_base + port);
+}
+
+void __iomem *ioport_map(unsigned long port, unsigned int nr)
+{
+        if (port > PIO_MASK)
+                return NULL;
+
+        return ioport_map_legacy(port, nr);
+}
+
+EXPORT_SYMBOL(ioport_map);
+
+void ioport_unmap(void __iomem *addr)
+{
+        /* Nothing to do */
+}
+
+EXPORT_SYMBOL(ioport_unmap);