[MTD][NOR] Add physical address to point() method

Adding the ability to get a physical address from point() in addition
to virtual address.  This physical address is required for XIP of
userspace code from flash.

Signed-off-by: Jared Hulbert <jaredeh@gmail.com>
Reviewed-by: Jörn Engel <joern@logfs.org>
Acked-by: Nicolas Pitre <nico@cam.org>
Acked-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

4 files changed, 41 insertions, 25 deletions

diff --git a/drivers/mtd/devices/mtdram.c b/drivers/mtd/devices/mtdram.c
index bf485ff49457..0399be178620 100644
--- a/drivers/mtd/devices/mtdram.c
+++ b/drivers/mtd/devices/mtdram.c
@@ -48,18 +48,21 @@ static int ram_erase(struct mtd_info *mtd, struct erase_info *instr)
 }
 
 static int ram_point(struct mtd_info *mtd, loff_t from, size_t len,
-		size_t *retlen, u_char **mtdbuf)
+		size_t *retlen, void **virt, resource_size_t *phys)
 {
 	if (from + len > mtd->size)
 		return -EINVAL;
 
-	*mtdbuf = mtd->priv + from;
+	/* can we return a physical address with this driver? */
+	if (phys)
+		return -EINVAL;
+
+	*virt = mtd->priv + from;
 	*retlen = len;
 	return 0;
 }
 
-static void ram_unpoint(struct mtd_info *mtd, u_char * addr, loff_t from,
-		size_t len)
+static void ram_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
 {
 }
 
diff --git a/drivers/mtd/devices/phram.c b/drivers/mtd/devices/phram.c
index 5f960182da95..c7987b1c5e01 100644
--- a/drivers/mtd/devices/phram.c
+++ b/drivers/mtd/devices/phram.c
@@ -57,20 +57,21 @@ static int phram_erase(struct mtd_info *mtd, struct erase_info *instr)
 }
 
 static int phram_point(struct mtd_info *mtd, loff_t from, size_t len,
-		size_t *retlen, u_char **mtdbuf)
+		size_t *retlen, void **virt, resource_size_t *phys)
 {
-	u_char *start = mtd->priv;
-
 	if (from + len > mtd->size)
 		return -EINVAL;
 
-	*mtdbuf = start + from;
+	/* can we return a physical address with this driver? */
+	if (phys)
+		return -EINVAL;
+
+	*virt = mtd->priv + from;
 	*retlen = len;
 	return 0;
 }
 
-static void phram_unpoint(struct mtd_info *mtd, u_char *addr, loff_t from,
-		size_t len)
+static void phram_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
 {
 }
 
diff --git a/drivers/mtd/devices/pmc551.c b/drivers/mtd/devices/pmc551.c
index 7060a0895ce2..bc9981749064 100644
--- a/drivers/mtd/devices/pmc551.c
+++ b/drivers/mtd/devices/pmc551.c
@@ -134,7 +134,8 @@ static int pmc551_erase(struct mtd_info *mtd, struct erase_info *instr)
 	eoff_lo = end & (priv->asize - 1);
 	soff_lo = instr->addr & (priv->asize - 1);
 
-	pmc551_point(mtd, instr->addr, instr->len, &retlen, &ptr);
+	pmc551_point(mtd, instr->addr, instr->len, &retlen,
+		     (void **)&ptr, NULL);
 
 	if (soff_hi == eoff_hi || mtd->size == priv->asize) {
 		/* The whole thing fits within one access, so just one shot
@@ -154,7 +155,8 @@ static int pmc551_erase(struct mtd_info *mtd, struct erase_info *instr)
 			}
 			soff_hi += priv->asize;
 			pmc551_point(mtd, (priv->base_map0 | soff_hi),
-				     priv->asize, &retlen, &ptr);
+				     priv->asize, &retlen,
+				     (void **)&ptr, NULL);
 		}
 		memset(ptr, 0xff, eoff_lo);
 	}
@@ -170,7 +172,7 @@ static int pmc551_erase(struct mtd_info *mtd, struct erase_info *instr)
 }
 
 static int pmc551_point(struct mtd_info *mtd, loff_t from, size_t len,
-			size_t * retlen, u_char ** mtdbuf)
+			size_t *retlen, void **virt, resource_size_t *phys)
 {
 	struct mypriv *priv = mtd->priv;
 	u32 soff_hi;
@@ -188,6 +190,10 @@ static int pmc551_point(struct mtd_info *mtd, loff_t from, size_t len,
 		return -EINVAL;
 	}
 
+	/* can we return a physical address with this driver? */
+	if (phys)
+		return -EINVAL;
+
 	soff_hi = from & ~(priv->asize - 1);
 	soff_lo = from & (priv->asize - 1);
 
@@ -198,13 +204,12 @@ static int pmc551_point(struct mtd_info *mtd, loff_t from, size_t len,
 		priv->curr_map0 = soff_hi;
 	}
 
-	*mtdbuf = priv->start + soff_lo;
+	*virt = priv->start + soff_lo;
 	*retlen = len;
 	return 0;
 }
 
-static void pmc551_unpoint(struct mtd_info *mtd, u_char * addr, loff_t from,
-			   size_t len)
+static void pmc551_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
 {
 #ifdef CONFIG_MTD_PMC551_DEBUG
 	printk(KERN_DEBUG "pmc551_unpoint()\n");
@@ -242,7 +247,7 @@ static int pmc551_read(struct mtd_info *mtd, loff_t from, size_t len,
 	soff_lo = from & (priv->asize - 1);
 	eoff_lo = end & (priv->asize - 1);
 
-	pmc551_point(mtd, from, len, retlen, &ptr);
+	pmc551_point(mtd, from, len, retlen, (void **)&ptr, NULL);
 
 	if (soff_hi == eoff_hi) {
 		/* The whole thing fits within one access, so just one shot
@@ -263,7 +268,8 @@ static int pmc551_read(struct mtd_info *mtd, loff_t from, size_t len,
 				goto out;
 			}
 			soff_hi += priv->asize;
-			pmc551_point(mtd, soff_hi, priv->asize, retlen, &ptr);
+			pmc551_point(mtd, soff_hi, priv->asize, retlen,
+				     (void **)&ptr, NULL);
 		}
 		memcpy(copyto, ptr, eoff_lo);
 		copyto += eoff_lo;
@@ -308,7 +314,7 @@ static int pmc551_write(struct mtd_info *mtd, loff_t to, size_t len,
 	soff_lo = to & (priv->asize - 1);
 	eoff_lo = end & (priv->asize - 1);
 
-	pmc551_point(mtd, to, len, retlen, &ptr);
+	pmc551_point(mtd, to, len, retlen, (void **)&ptr, NULL);
 
 	if (soff_hi == eoff_hi) {
 		/* The whole thing fits within one access, so just one shot
@@ -329,7 +335,8 @@ static int pmc551_write(struct mtd_info *mtd, loff_t to, size_t len,
 				goto out;
 			}
 			soff_hi += priv->asize;
-			pmc551_point(mtd, soff_hi, priv->asize, retlen, &ptr);
+			pmc551_point(mtd, soff_hi, priv->asize, retlen,
+				     (void **)&ptr, NULL);
 		}
 		memcpy(ptr, copyfrom, eoff_lo);
 		copyfrom += eoff_lo;
diff --git a/drivers/mtd/devices/slram.c b/drivers/mtd/devices/slram.c
index d293add1857c..cb86db746f28 100644
--- a/drivers/mtd/devices/slram.c
+++ b/drivers/mtd/devices/slram.c
@@ -76,8 +76,9 @@ static char *map;
 static slram_mtd_list_t *slram_mtdlist = NULL;
 
 static int slram_erase(struct mtd_info *, struct erase_info *);
-static int slram_point(struct mtd_info *, loff_t, size_t, size_t *, u_char **);
-static void slram_unpoint(struct mtd_info *, u_char *, loff_t,	size_t);
+static int slram_point(struct mtd_info *, loff_t, size_t, size_t *, void **,
+		resource_size_t *);
+static void slram_unpoint(struct mtd_info *, loff_t, size_t);
 static int slram_read(struct mtd_info *, loff_t, size_t, size_t *, u_char *);
 static int slram_write(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
 
@@ -104,19 +105,23 @@ static int slram_erase(struct mtd_info *mtd, struct erase_info *instr)
 }
 
 static int slram_point(struct mtd_info *mtd, loff_t from, size_t len,
-		size_t *retlen, u_char **mtdbuf)
+		size_t *retlen, void **virt, resource_size_t *phys)
 {
 	slram_priv_t *priv = mtd->priv;
 
+	/* can we return a physical address with this driver? */
+	if (phys)
+		return -EINVAL;
+
 	if (from + len > mtd->size)
 		return -EINVAL;
 
-	*mtdbuf = priv->start + from;
+	*virt = priv->start + from;
 	*retlen = len;
 	return(0);
 }
 
-static void slram_unpoint(struct mtd_info *mtd, u_char *addr, loff_t from, size_t len)
+static void slram_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
 {
 }