source: patches/linux-2.6.17.4-mips_fixes-2.patch@ c8fe990

Submitted By: Jim Gifford (patches at jg555 dot com)
Date: 2006-07-08
Initial Package Version: 2.6.17.4
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

diff -Naur linux-2.6.17.4/arch/mips/lib/iomap.c linux-2.6.17.4.kernel/arch/mips/lib/iomap.c
--- linux-2.6.17.4/arch/mips/lib/iomap.c        1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.17.4.kernel/arch/mips/lib/iomap.c 2006-06-30 10:37:38.000000000 -0700
@@ -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-2.6.17.4/arch/mips/lib/Makefile linux-2.6.17.4.kernel/arch/mips/lib/Makefile
--- linux-2.6.17.4/arch/mips/lib/Makefile       2006-07-02 01:53:19.000000000 -0700
+++ linux-2.6.17.4.kernel/arch/mips/lib/Makefile        2006-07-07 12:40:23.000000000 -0700
@@ -5,6 +5,8 @@
 lib-y  += csum_partial_copy.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-2.6.17.4/include/asm-mips/io.h linux-2.6.17.4.kernel/include/asm-mips/io.h
--- linux-2.6.17.4/include/asm-mips/io.h        2006-07-02 01:53:19.000000000 -0700
+++ linux-2.6.17.4.kernel/include/asm-mips/io.h 2006-07-07 12:44:03.000000000 -0700
@@ -519,6 +519,34 @@
 }
 
 /*
+ * 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-2.6.17.4/include/asm-mips/mach-cobalt/ide.h linux-2.6.17.4.kernel/include/asm-mips/mach-cobalt/ide.h
--- linux-2.6.17.4/include/asm-mips/mach-cobalt/ide.h   1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.17.4.kernel/include/asm-mips/mach-cobalt/ide.h    2006-07-07 12:40:46.000000000 -0700
@@ -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
diff -Naur linux-2.6.17.4/arch/mips/lib/ashldi3.c linux-2.6.17.4/arch/mips/lib/ashldi3.c
--- linux-2.6.17.4/arch/mips/lib/ashldi3.c      1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.17.4/arch/mips/lib/ashldi3.c      2006-06-19 18:16:13.000000000 -0700
@@ -0,0 +1,29 @@
+#include <linux/module.h>
+
+#include "libgcc.h"
+
+long long __ashldi3(long long u, word_type b)
+{
+       DWunion uu, w;
+       word_type bm;
+
+       if (b == 0)
+               return u;
+
+       uu.ll = u;
+       bm = 32 - b;
+
+       if (bm <= 0) {
+               w.s.low = 0;
+               w.s.high = (unsigned int) uu.s.low << -bm;
+       } else {
+               const unsigned int carries = (unsigned int) uu.s.low >> bm;
+
+               w.s.low = (unsigned int) uu.s.low << b;
+               w.s.high = ((unsigned int) uu.s.high << b) | carries;
+       }
+
+       return w.ll;
+}
+
+EXPORT_SYMBOL(__ashldi3);
diff -Naur linux-2.6.17.4/arch/mips/lib/ashrdi3.c linux-2.6.17.4/arch/mips/lib/ashrdi3.c
--- linux-2.6.17.4/arch/mips/lib/ashrdi3.c      1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.17.4/arch/mips/lib/ashrdi3.c      2006-06-19 18:16:13.000000000 -0700
@@ -0,0 +1,31 @@
+#include <linux/module.h>
+
+#include "libgcc.h"
+
+long long __ashrdi3(long long u, word_type b)
+{
+       DWunion uu, w;
+       word_type bm;
+
+       if (b == 0)
+               return u;
+
+       uu.ll = u;
+       bm = 32 - b;
+
+       if (bm <= 0) {
+               /* w.s.high = 1..1 or 0..0 */
+               w.s.high =
+                   uu.s.high >> 31;
+               w.s.low = uu.s.high >> -bm;
+       } else {
+               const unsigned int carries = (unsigned int) uu.s.high << bm;
+
+               w.s.high = uu.s.high >> b;
+               w.s.low = ((unsigned int) uu.s.low >> b) | carries;
+       }
+
+       return w.ll;
+}
+
+EXPORT_SYMBOL(__ashrdi3);
diff -Naur linux-2.6.17.4/arch/mips/lib/libgcc.h linux-2.6.17.4/arch/mips/lib/libgcc.h
--- linux-2.6.17.4/arch/mips/lib/libgcc.h       1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.17.4/arch/mips/lib/libgcc.h       2006-06-19 18:16:13.000000000 -0700
@@ -0,0 +1,26 @@
+#ifndef __ASM_LIBGCC_H
+#define __ASM_LIBGCC_H
+
+#include <asm/byteorder.h>
+
+typedef int word_type __attribute__ ((mode (__word__)));
+
+#ifdef __BIG_ENDIAN
+struct DWstruct {
+       int high, low;
+};
+#elif defined(__LITTLE_ENDIAN)
+struct DWstruct {
+       int low, high;
+};
+#else
+#error I feel sick.
+#endif
+
+typedef union
+{
+       struct DWstruct s;
+       long long ll;
+} DWunion;
+
+#endif /* __ASM_LIBGCC_H */
diff -Naur linux-2.6.17.4/arch/mips/lib/lshrdi3.c linux-2.6.17.4/arch/mips/lib/lshrdi3.c
--- linux-2.6.17.4/arch/mips/lib/lshrdi3.c      1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.17.4/arch/mips/lib/lshrdi3.c      2006-06-19 18:16:13.000000000 -0700
@@ -0,0 +1,29 @@
+#include <linux/module.h>
+
+#include "libgcc.h"
+
+long long __lshrdi3(long long u, word_type b)
+{
+       DWunion uu, w;
+       word_type bm;
+
+       if (b == 0)
+               return u;
+
+       uu.ll = u;
+       bm = 32 - b;
+
+       if (bm <= 0) {
+               w.s.high = 0;
+               w.s.low = (unsigned int) uu.s.high >> -bm;
+       } else {
+               const unsigned int carries = (unsigned int) uu.s.high << bm;
+
+               w.s.high = (unsigned int) uu.s.high >> b;
+               w.s.low = ((unsigned int) uu.s.low >> b) | carries;
+       }
+
+       return w.ll;
+}
+
+EXPORT_SYMBOL(__lshrdi3);