source: clfs-embedded/patches/linux-2.6.20-mips_fixes-1.patch@ 16fdb8a

Submitted By: Jim Gifford (patches at jg555 dot com)
Date: 2007-02-04
Initial Package Version: 2.6.20
Origin: Linux-MIPS Mailing List
Upstream Status: Not Applied
Description: These are patches that have not been accepted by
             Linux-MIPS.

        1 - iomap for MIPS - iomap.c io.h
        2 - Cobalt ide fixes
        3 - Updates to Support N32 only builds

diff -Naur linux-mips-2.6.20/arch/mips/kernel/Makefile linux-2.6.20/arch/mips/kernel/Makefile
--- linux-mips-2.6.20/arch/mips/kernel/Makefile 2007-02-04 12:22:45.000000000 -0800
+++ linux-2.6.20/arch/mips/kernel/Makefile      2007-02-04 20:10:24.000000000 -0800
@@ -56,7 +56,7 @@
 obj-$(CONFIG_64BIT)            += scall64-64.o
 obj-$(CONFIG_BINFMT_IRIX)      += binfmt_irix.o
 obj-$(CONFIG_MIPS32_COMPAT)    += linux32.o signal32.o
-obj-$(CONFIG_MIPS32_N32)       += binfmt_elfn32.o scall64-n32.o signal_n32.o
+obj-$(CONFIG_MIPS32_N32)       += binfmt_elfn32.o scall64-n32.o signal_n32.o ptrace32.o
 obj-$(CONFIG_MIPS32_O32)       += binfmt_elfo32.o scall64-o32.o ptrace32.o
 
 obj-$(CONFIG_KGDB)             += gdb-low.o gdb-stub.o
diff -Naur linux-mips-2.6.20/arch/mips/lib/Makefile linux-2.6.20/arch/mips/lib/Makefile
--- linux-mips-2.6.20/arch/mips/lib/Makefile    2007-02-04 12:22:45.000000000 -0800
+++ linux-2.6.20/arch/mips/lib/Makefile 2007-02-04 20:10:24.000000000 -0800
@@ -5,6 +5,8 @@
 lib-y  += csum_partial.o memcpy.o promlib.o \
           strlen_user.o strncpy_user.o strnlen_user.o uncached.o
 
+obj-y  += iomap.o
+
 # libgcc-style stuff needed in the kernel
 lib-y += ashldi3.o ashrdi3.o lshrdi3.o
 
diff -Naur linux-mips-2.6.20/arch/mips/lib/iomap.c linux-2.6.20/arch/mips/lib/iomap.c
--- linux-mips-2.6.20/arch/mips/lib/iomap.c     1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.20/arch/mips/lib/iomap.c  2007-02-04 20:10:24.000000000 -0800
@@ -0,0 +1,78 @@
+/*
+ *  iomap.c, Memory Mapped I/O routines for MIPS architecture.
+ *
+ *  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.
+ *
+ *  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
+ */
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#include <asm/io.h>
+
+void __iomem *ioport_map(unsigned long port, unsigned int nr)
+{
+       unsigned long end;
+
+       end = port + nr - 1UL;
+       if (ioport_resource.start > port ||
+           ioport_resource.end < end || port > end)
+               return NULL;
+
+       return (void __iomem *)(mips_io_port_base + port);
+}
+
+void ioport_unmap(void __iomem *addr)
+{
+}
+EXPORT_SYMBOL(ioport_map);
+EXPORT_SYMBOL(ioport_unmap);
+
+void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
+{
+       unsigned long start, len, flags;
+
+       if (dev == NULL)
+               return NULL;
+
+       start = pci_resource_start(dev, bar);
+       len = pci_resource_len(dev, bar);
+       if (!start || !len)
+               return NULL;
+
+       if (maxlen != 0 && len > maxlen)
+               len = maxlen;
+
+       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);
+       }
+
+       return NULL;
+}
+
+void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
+{
+       iounmap(addr);
+}
+EXPORT_SYMBOL(pci_iomap);
+EXPORT_SYMBOL(pci_iounmap);
diff -Naur linux-mips-2.6.20/include/asm-mips/io.h linux-2.6.20/include/asm-mips/io.h
--- linux-mips-2.6.20/include/asm-mips/io.h     2007-02-04 12:22:45.000000000 -0800
+++ linux-2.6.20/include/asm-mips/io.h  2007-02-04 20:10:24.000000000 -0800
@@ -518,6 +518,34 @@
 }
 
 /*
+ * Memory Mapped I/O
+ */
+#define ioread8(addr)          readb(addr)
+#define ioread16(addr)         readw(addr)
+#define ioread32(addr)         readl(addr)
+
+#define iowrite8(b,addr)       writeb(b,addr)
+#define iowrite16(w,addr)      writew(w,addr)
+#define iowrite32(l,addr)      writel(l,addr)
+
+#define ioread8_rep(a,b,c)     readsb(a,b,c)
+#define ioread16_rep(a,b,c)    readsw(a,b,c)
+#define ioread32_rep(a,b,c)    readsl(a,b,c)
+
+#define iowrite8_rep(a,b,c)    writesb(a,b,c)
+#define iowrite16_rep(a,b,c)   writesw(a,b,c)
+#define iowrite32_rep(a,b,c)   writesl(a,b,c)
+
+/* Create a virtual mapping cookie for an IO port range */
+extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
+extern void ioport_unmap(void __iomem *);
+
+/* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
+struct pci_dev;
+extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
+extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
+
+/*
  * ISA space is 'always mapped' on currently supported MIPS systems, no need
  * to explicitly ioremap() it. The fact that the ISA IO space is mapped
  * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
diff -Naur linux-mips-2.6.20/include/asm-mips/mach-cobalt/ide.h linux-2.6.20/include/asm-mips/mach-cobalt/ide.h
--- linux-mips-2.6.20/include/asm-mips/mach-cobalt/ide.h        1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.20/include/asm-mips/mach-cobalt/ide.h     2007-02-04 20:10:24.000000000 -0800
@@ -0,0 +1,83 @@
+
+/*
+ * PIO "in" transfers can cause D-cache lines to be allocated
+ * to the data being read. If the target is the page cache then
+ * the kernel can create a user space mapping of the same page
+ * without flushing it from the D-cache. This has large potential
+ * to create cache aliases. The Cobalts seem to trigger this
+ * problem easily.
+ *
+ * MIPs doesn't have a flush_dcache_range() so we roll
+ * our own.
+ *
+ * -- pdh
+ */
+
+#define MAX_HWIFS                      2
+
+#include <asm/r4kcache.h>
+
+static inline void __flush_dcache(void)
+{
+       unsigned long dc_size, dc_line, addr, end;
+
+       dc_size = current_cpu_data.dcache.ways << current_cpu_data.dcache.waybit;
+       dc_line = current_cpu_data.dcache.linesz;
+
+       addr = CKSEG0;
+       end = addr + dc_size;
+
+       for (; addr < end; addr += dc_line)
+               flush_dcache_line_indexed(addr);
+}
+
+static inline void __flush_dcache_range(unsigned long start, unsigned long end)
+{
+       unsigned long dc_size, dc_line, addr;
+
+       dc_size = current_cpu_data.dcache.ways << current_cpu_data.dcache.waybit;
+       dc_line = current_cpu_data.dcache.linesz;
+
+       addr = start & ~(dc_line - 1);
+       end += dc_line - 1;
+
+       if (end - addr < dc_size)
+               for (; addr < end; addr += dc_line)
+                       flush_dcache_line(addr);
+       else
+               __flush_dcache();
+}
+
+static inline void __ide_insw(unsigned long port, void *addr, unsigned int count)
+{
+       insw(port, addr, count);
+
+       __flush_dcache_range((unsigned long) addr, (unsigned long) addr + count * 2);
+}
+
+static inline void __ide_insl(unsigned long port, void *addr, unsigned int count)
+{
+       insl(port, addr, count);
+
+       __flush_dcache_range((unsigned long) addr, (unsigned long) addr + count * 4);
+}
+
+static inline void __ide_mm_insw(volatile void __iomem *port, void *addr, unsigned int count)
+{
+       readsw(port, addr, count);
+
+       __flush_dcache_range((unsigned long) addr, (unsigned long) addr + count * 2);
+}
+
+static inline void __ide_mm_insl(volatile void __iomem *port, void *addr, unsigned int count)
+{
+       readsl(port, addr, count);
+
+       __flush_dcache_range((unsigned long) addr, (unsigned long) addr + count * 4);
+}
+
+#define insw                   __ide_insw
+#define insl                   __ide_insl
+
+#define __ide_mm_outsw         writesw
+#define __ide_mm_outsl         writesl