X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=include%2Flinux%2Fmtd%2Fmap.h;h=28d461d862bda1d042055c463613a1a87338b698;hb=refs%2Fheads%2Fvserver;hp=0c933f9bf1fea22c7189390c1baf0b86f63adc19;hpb=5273a3df6485dc2ad6aa7ddd441b9a21970f003b;p=linux-2.6.git

diff --git a/include/linux/mtd/map.h b/include/linux/mtd/map.h
index 0c933f9bf..28d461d86 100644
--- a/include/linux/mtd/map.h
+++ b/include/linux/mtd/map.h
@@ -1,28 +1,181 @@
 
 /* Overhauled routines for dealing with different mmap regions of flash */
-/* $Id: map.h,v 1.34 2003/05/28 12:42:22 dwmw2 Exp $ */
+/* $Id: map.h,v 1.54 2005/11/07 11:14:54 gleixner Exp $ */
 
 #ifndef __LINUX_MTD_MAP_H__
 #define __LINUX_MTD_MAP_H__
 
-#include <linux/config.h>
 #include <linux/types.h>
 #include <linux/list.h>
+#include <linux/string.h>
+
+#include <linux/mtd/compatmac.h>
+
+#include <asm/unaligned.h>
 #include <asm/system.h>
 #include <asm/io.h>
 
+#ifdef CONFIG_MTD_MAP_BANK_WIDTH_1
+#define map_bankwidth(map) 1
+#define map_bankwidth_is_1(map) (map_bankwidth(map) == 1)
+#define map_bankwidth_is_large(map) (0)
+#define map_words(map) (1)
+#define MAX_MAP_BANKWIDTH 1
+#else
+#define map_bankwidth_is_1(map) (0)
+#endif
+
+#ifdef CONFIG_MTD_MAP_BANK_WIDTH_2
+# ifdef map_bankwidth
+#  undef map_bankwidth
+#  define map_bankwidth(map) ((map)->bankwidth)
+# else
+#  define map_bankwidth(map) 2
+#  define map_bankwidth_is_large(map) (0)
+#  define map_words(map) (1)
+# endif
+#define map_bankwidth_is_2(map) (map_bankwidth(map) == 2)
+#undef MAX_MAP_BANKWIDTH
+#define MAX_MAP_BANKWIDTH 2
+#else
+#define map_bankwidth_is_2(map) (0)
+#endif
+
+#ifdef CONFIG_MTD_MAP_BANK_WIDTH_4
+# ifdef map_bankwidth
+#  undef map_bankwidth
+#  define map_bankwidth(map) ((map)->bankwidth)
+# else
+#  define map_bankwidth(map) 4
+#  define map_bankwidth_is_large(map) (0)
+#  define map_words(map) (1)
+# endif
+#define map_bankwidth_is_4(map) (map_bankwidth(map) == 4)
+#undef MAX_MAP_BANKWIDTH
+#define MAX_MAP_BANKWIDTH 4
+#else
+#define map_bankwidth_is_4(map) (0)
+#endif
+
+/* ensure we never evaluate anything shorted than an unsigned long
+ * to zero, and ensure we'll never miss the end of an comparison (bjd) */
+
+#define map_calc_words(map) ((map_bankwidth(map) + (sizeof(unsigned long)-1))/ sizeof(unsigned long))
+
+#ifdef CONFIG_MTD_MAP_BANK_WIDTH_8
+# ifdef map_bankwidth
+#  undef map_bankwidth
+#  define map_bankwidth(map) ((map)->bankwidth)
+#  if BITS_PER_LONG < 64
+#   undef map_bankwidth_is_large
+#   define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
+#   undef map_words
+#   define map_words(map) map_calc_words(map)
+#  endif
+# else
+#  define map_bankwidth(map) 8
+#  define map_bankwidth_is_large(map) (BITS_PER_LONG < 64)
+#  define map_words(map) map_calc_words(map)
+# endif
+#define map_bankwidth_is_8(map) (map_bankwidth(map) == 8)
+#undef MAX_MAP_BANKWIDTH
+#define MAX_MAP_BANKWIDTH 8
+#else
+#define map_bankwidth_is_8(map) (0)
+#endif
+
+#ifdef CONFIG_MTD_MAP_BANK_WIDTH_16
+# ifdef map_bankwidth
+#  undef map_bankwidth
+#  define map_bankwidth(map) ((map)->bankwidth)
+#  undef map_bankwidth_is_large
+#  define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
+#  undef map_words
+#  define map_words(map) map_calc_words(map)
+# else
+#  define map_bankwidth(map) 16
+#  define map_bankwidth_is_large(map) (1)
+#  define map_words(map) map_calc_words(map)
+# endif
+#define map_bankwidth_is_16(map) (map_bankwidth(map) == 16)
+#undef MAX_MAP_BANKWIDTH
+#define MAX_MAP_BANKWIDTH 16
+#else
+#define map_bankwidth_is_16(map) (0)
+#endif
+
+#ifdef CONFIG_MTD_MAP_BANK_WIDTH_32
+# ifdef map_bankwidth
+#  undef map_bankwidth
+#  define map_bankwidth(map) ((map)->bankwidth)
+#  undef map_bankwidth_is_large
+#  define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
+#  undef map_words
+#  define map_words(map) map_calc_words(map)
+# else
+#  define map_bankwidth(map) 32
+#  define map_bankwidth_is_large(map) (1)
+#  define map_words(map) map_calc_words(map)
+# endif
+#define map_bankwidth_is_32(map) (map_bankwidth(map) == 32)
+#undef MAX_MAP_BANKWIDTH
+#define MAX_MAP_BANKWIDTH 32
+#else
+#define map_bankwidth_is_32(map) (0)
+#endif
+
+#ifndef map_bankwidth
+#error "No bus width supported. What's the point?"
+#endif
+
+static inline int map_bankwidth_supported(int w)
+{
+	switch (w) {
+#ifdef CONFIG_MTD_MAP_BANK_WIDTH_1
+	case 1:
+#endif
+#ifdef CONFIG_MTD_MAP_BANK_WIDTH_2
+	case 2:
+#endif
+#ifdef CONFIG_MTD_MAP_BANK_WIDTH_4
+	case 4:
+#endif
+#ifdef CONFIG_MTD_MAP_BANK_WIDTH_8
+	case 8:
+#endif
+#ifdef CONFIG_MTD_MAP_BANK_WIDTH_16
+	case 16:
+#endif
+#ifdef CONFIG_MTD_MAP_BANK_WIDTH_32
+	case 32:
+#endif
+		return 1;
+
+	default:
+		return 0;
+	}
+}
+
+#define MAX_MAP_LONGS ( ((MAX_MAP_BANKWIDTH*8) + BITS_PER_LONG - 1) / BITS_PER_LONG )
+
+typedef union {
+	unsigned long x[MAX_MAP_LONGS];
+} map_word;
+
 /* The map stuff is very simple. You fill in your struct map_info with
    a handful of routines for accessing the device, making sure they handle
    paging etc. correctly if your device needs it. Then you pass it off
-   to a chip driver which deals with a mapped device - generally either
-   do_cfi_probe() or do_ram_probe(), either of which will return a 
-   struct mtd_info if they liked what they saw. At which point, you
-   fill in the mtd->module with your own module address, and register 
-   it.
-   
+   to a chip probe routine -- either JEDEC or CFI probe or both -- via
+   do_map_probe(). If a chip is recognised, the probe code will invoke the
+   appropriate chip driver (if present) and return a struct mtd_info.
+   At which point, you fill in the mtd->module with your own module
+   address, and register it with the MTD core code. Or you could partition
+   it and register the partitions instead, or keep it for your own private
+   use; whatever.
+
    The mtd->priv field will point to the struct map_info, and any further
-   private data required by the chip driver is linked from the 
-   mtd->priv->fldrv_priv field. This allows the map driver to get at 
+   private data required by the chip driver is linked from the
+   mtd->priv->fldrv_priv field. This allows the map driver to get at
    the destructor function map->fldrv_destroy() when it's tired
    of living.
 */
@@ -33,32 +186,33 @@ struct map_info {
 	unsigned long phys;
 #define NO_XIP (-1UL)
 
-	unsigned long virt;
+	void __iomem *virt;
 	void *cached;
 
-	int buswidth; /* in octets */
+	int bankwidth; /* in octets. This isn't necessarily the width
+		       of actual bus cycles -- it's the repeat interval
+		      in bytes, before you are talking to the first chip again.
+		      */
 
 #ifdef CONFIG_MTD_COMPLEX_MAPPINGS
-	u8 (*read8)(struct map_info *, unsigned long);
-	u16 (*read16)(struct map_info *, unsigned long);
-	u32 (*read32)(struct map_info *, unsigned long);  
-	u64 (*read64)(struct map_info *, unsigned long);  
-	/* If it returned a 'long' I'd call it readl.
-	 * It doesn't.
-	 * I won't.
-	 * dwmw2 */
-	
+	map_word (*read)(struct map_info *, unsigned long);
 	void (*copy_from)(struct map_info *, void *, unsigned long, ssize_t);
-	void (*write8)(struct map_info *, u8, unsigned long);
-	void (*write16)(struct map_info *, u16, unsigned long);
-	void (*write32)(struct map_info *, u32, unsigned long);
-	void (*write64)(struct map_info *, u64, unsigned long);
+
+	void (*write)(struct map_info *, const map_word, unsigned long);
 	void (*copy_to)(struct map_info *, unsigned long, const void *, ssize_t);
 
 	/* We can perhaps put in 'point' and 'unpoint' methods, if we really
 	   want to enable XIP for non-linear mappings. Not yet though. */
 #endif
-	/* set_vpp() must handle being reentered -- enable, enable, disable 
+	/* It's possible for the map driver to use cached memory in its
+	   copy_from implementation (and _only_ with copy_from).  However,
+	   when the chip driver knows some flash area has changed contents,
+	   it will signal it to the map driver through this routine to let
+	   the map driver invalidate the corresponding cache as needed.
+	   If there is no cache to care about this can be set to NULL. */
+	void (*inval_cache)(struct map_info *, unsigned long, ssize_t);
+
+	/* set_vpp() must handle being reentered -- enable, enable, disable
 	   must leave it enabled. */
 	void (*set_vpp)(struct map_info *, int);
 
@@ -85,87 +239,197 @@ void map_destroy(struct mtd_info *mtd);
 #define ENABLE_VPP(map) do { if(map->set_vpp) map->set_vpp(map, 1); } while(0)
 #define DISABLE_VPP(map) do { if(map->set_vpp) map->set_vpp(map, 0); } while(0)
 
-#ifdef CONFIG_MTD_COMPLEX_MAPPINGS
-#define map_read8(map, ofs) (map)->read8(map, ofs)
-#define map_read16(map, ofs) (map)->read16(map, ofs)
-#define map_read32(map, ofs) (map)->read32(map, ofs)
-#define map_read64(map, ofs) (map)->read64(map, ofs)
-#define map_copy_from(map, to, from, len) (map)->copy_from(map, to, from, len)
-#define map_write8(map, datum, ofs) (map)->write8(map, datum, ofs)
-#define map_write16(map, datum, ofs) (map)->write16(map, datum, ofs)
-#define map_write32(map, datum, ofs) (map)->write32(map, datum, ofs)
-#define map_write64(map, datum, ofs) (map)->write64(map, datum, ofs)
-#define map_copy_to(map, to, from, len) (map)->copy_to(map, to, from, len)
+#define INVALIDATE_CACHED_RANGE(map, from, size) \
+	do { if(map->inval_cache) map->inval_cache(map, from, size); } while(0)
 
-extern void simple_map_init(struct map_info *);
-#define map_is_linear(map) (map->phys != NO_XIP)
 
-#else
-static inline u8 map_read8(struct map_info *map, unsigned long ofs)
+static inline int map_word_equal(struct map_info *map, map_word val1, map_word val2)
 {
-	return __raw_readb(map->virt + ofs);
+	int i;
+	for (i=0; i<map_words(map); i++) {
+		if (val1.x[i] != val2.x[i])
+			return 0;
+	}
+	return 1;
 }
 
-static inline u16 map_read16(struct map_info *map, unsigned long ofs)
+static inline map_word map_word_and(struct map_info *map, map_word val1, map_word val2)
 {
-	return __raw_readw(map->virt + ofs);
+	map_word r;
+	int i;
+
+	for (i=0; i<map_words(map); i++) {
+		r.x[i] = val1.x[i] & val2.x[i];
+	}
+	return r;
 }
 
-static inline u32 map_read32(struct map_info *map, unsigned long ofs)
+static inline map_word map_word_clr(struct map_info *map, map_word val1, map_word val2)
 {
-	return __raw_readl(map->virt + ofs);
+	map_word r;
+	int i;
+
+	for (i=0; i<map_words(map); i++) {
+		r.x[i] = val1.x[i] & ~val2.x[i];
+	}
+	return r;
 }
 
-static inline u64 map_read64(struct map_info *map, unsigned long ofs)
+static inline map_word map_word_or(struct map_info *map, map_word val1, map_word val2)
 {
-#ifndef CONFIG_MTD_CFI_B8 /* 64-bit mappings */
-	BUG();
+	map_word r;
+	int i;
+
+	for (i=0; i<map_words(map); i++) {
+		r.x[i] = val1.x[i] | val2.x[i];
+	}
+	return r;
+}
+
+#define map_word_andequal(m, a, b, z) map_word_equal(m, z, map_word_and(m, a, b))
+
+static inline int map_word_bitsset(struct map_info *map, map_word val1, map_word val2)
+{
+	int i;
+
+	for (i=0; i<map_words(map); i++) {
+		if (val1.x[i] & val2.x[i])
+			return 1;
+	}
 	return 0;
-#else
-	return __raw_readll(map->virt + ofs);
+}
+
+static inline map_word map_word_load(struct map_info *map, const void *ptr)
+{
+	map_word r;
+
+	if (map_bankwidth_is_1(map))
+		r.x[0] = *(unsigned char *)ptr;
+	else if (map_bankwidth_is_2(map))
+		r.x[0] = get_unaligned((uint16_t *)ptr);
+	else if (map_bankwidth_is_4(map))
+		r.x[0] = get_unaligned((uint32_t *)ptr);
+#if BITS_PER_LONG >= 64
+	else if (map_bankwidth_is_8(map))
+		r.x[0] = get_unaligned((uint64_t *)ptr);
 #endif
+	else if (map_bankwidth_is_large(map))
+		memcpy(r.x, ptr, map->bankwidth);
+
+	return r;
 }
 
-static inline void map_write8(struct map_info *map, u8 datum, unsigned long ofs)
+static inline map_word map_word_load_partial(struct map_info *map, map_word orig, const unsigned char *buf, int start, int len)
 {
-	__raw_writeb(datum, map->virt + ofs);
-	mb();
+	int i;
+
+	if (map_bankwidth_is_large(map)) {
+		char *dest = (char *)&orig;
+		memcpy(dest+start, buf, len);
+	} else {
+		for (i=start; i < start+len; i++) {
+			int bitpos;
+#ifdef __LITTLE_ENDIAN
+			bitpos = i*8;
+#else /* __BIG_ENDIAN */
+			bitpos = (map_bankwidth(map)-1-i)*8;
+#endif
+			orig.x[0] &= ~(0xff << bitpos);
+			orig.x[0] |= buf[i-start] << bitpos;
+		}
+	}
+	return orig;
 }
 
-static inline void map_write16(struct map_info *map, u16 datum, unsigned long ofs)
+#if BITS_PER_LONG < 64
+#define MAP_FF_LIMIT 4
+#else
+#define MAP_FF_LIMIT 8
+#endif
+
+static inline map_word map_word_ff(struct map_info *map)
 {
-	__raw_writew(datum, map->virt + ofs);
-	mb();
+	map_word r;
+	int i;
+
+	if (map_bankwidth(map) < MAP_FF_LIMIT) {
+		int bw = 8 * map_bankwidth(map);
+		r.x[0] = (1 << bw) - 1;
+	} else {
+		for (i=0; i<map_words(map); i++)
+			r.x[i] = ~0UL;
+	}
+	return r;
 }
 
-static inline void map_write32(struct map_info *map, u32 datum, unsigned long ofs)
+static inline map_word inline_map_read(struct map_info *map, unsigned long ofs)
 {
-	__raw_writel(datum, map->virt + ofs);
-	mb();
+	map_word r;
+
+	if (map_bankwidth_is_1(map))
+		r.x[0] = __raw_readb(map->virt + ofs);
+	else if (map_bankwidth_is_2(map))
+		r.x[0] = __raw_readw(map->virt + ofs);
+	else if (map_bankwidth_is_4(map))
+		r.x[0] = __raw_readl(map->virt + ofs);
+#if BITS_PER_LONG >= 64
+	else if (map_bankwidth_is_8(map))
+		r.x[0] = __raw_readq(map->virt + ofs);
+#endif
+	else if (map_bankwidth_is_large(map))
+		memcpy_fromio(r.x, map->virt+ofs, map->bankwidth);
+
+	return r;
 }
 
-static inline void map_write64(struct map_info *map, u64 datum, unsigned long ofs)
+static inline void inline_map_write(struct map_info *map, const map_word datum, unsigned long ofs)
 {
-#ifndef CONFIG_MTD_CFI_B8 /* 64-bit mappings */
-	BUG();
-#else
-	__raw_writell(datum, map->virt + ofs);
+	if (map_bankwidth_is_1(map))
+		__raw_writeb(datum.x[0], map->virt + ofs);
+	else if (map_bankwidth_is_2(map))
+		__raw_writew(datum.x[0], map->virt + ofs);
+	else if (map_bankwidth_is_4(map))
+		__raw_writel(datum.x[0], map->virt + ofs);
+#if BITS_PER_LONG >= 64
+	else if (map_bankwidth_is_8(map))
+		__raw_writeq(datum.x[0], map->virt + ofs);
+#endif
+	else if (map_bankwidth_is_large(map))
+		memcpy_toio(map->virt+ofs, datum.x, map->bankwidth);
 	mb();
-#endif /* CFI_B8 */
 }
 
-static inline void map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
+static inline void inline_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
 {
-	memcpy_fromio(to, map->virt + from, len);
+	if (map->cached)
+		memcpy(to, (char *)map->cached + from, len);
+	else
+		memcpy_fromio(to, map->virt + from, len);
 }
 
-static inline void map_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
+static inline void inline_map_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
 {
 	memcpy_toio(map->virt + to, from, len);
 }
 
-#define simple_map_init(map) do { } while (0)
-#define map_is_linear(map) (1)
+#ifdef CONFIG_MTD_COMPLEX_MAPPINGS
+#define map_read(map, ofs) (map)->read(map, ofs)
+#define map_copy_from(map, to, from, len) (map)->copy_from(map, to, from, len)
+#define map_write(map, datum, ofs) (map)->write(map, datum, ofs)
+#define map_copy_to(map, to, from, len) (map)->copy_to(map, to, from, len)
+
+extern void simple_map_init(struct map_info *);
+#define map_is_linear(map) (map->phys != NO_XIP)
+
+#else
+#define map_read(map, ofs) inline_map_read(map, ofs)
+#define map_copy_from(map, to, from, len) inline_map_copy_from(map, to, from, len)
+#define map_write(map, datum, ofs) inline_map_write(map, datum, ofs)
+#define map_copy_to(map, to, from, len) inline_map_copy_to(map, to, from, len)
+
+
+#define simple_map_init(map) BUG_ON(!map_bankwidth_supported((map)->bankwidth))
+#define map_is_linear(map) ({ (void)(map); 1; })
 
 #endif /* !CONFIG_MTD_COMPLEX_MAPPINGS */