implement memmap for mem driver

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

3 files changed, 12 insertions, 1 deletions

diff --git a/commands/mem.c b/commands/mem.c
index b030f2d740..e5aa3453db 100644
--- a/commands/mem.c
+++ b/commands/mem.c
@@ -532,6 +532,7 @@ static struct driver_d mem_drv = {
 	.close = dev_close_default,
 	.read  = mem_read,
 	.write = mem_write,
+	.memmap = mem_memmap,
 	.lseek = dev_lseek_default,
 };
 
@@ -543,6 +544,7 @@ static struct driver_d ram_drv = {
 	.read  = mem_read,
 	.write = mem_write,
 	.lseek = dev_lseek_default,
+	.memmap = mem_memmap,
 	.type  = DEVICE_TYPE_DRAM,
 };
 
@@ -552,6 +554,7 @@ static struct driver_d rom_drv = {
 	.open  = dev_open_default,
 	.close = dev_close_default,
 	.read  = mem_read,
+	.memmap = mem_memmap,
 	.lseek = dev_lseek_default,
 };
 
diff --git a/fs/fs.c b/fs/fs.c
index d0b008aca1..a2a8ed13f3 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -604,7 +604,7 @@ void *memmap(int fd, int flags)
 	struct device_d *dev;
 	struct fs_driver_d *fsdrv;
 	FILE *f = &files[fd];
-	void *ret = NULL;
+	void *ret = (void *)-1;
 
 	dev = f->dev;
 
@@ -962,3 +962,10 @@ ssize_t mem_write(struct device_d *dev, const void *buf, size_t count, ulong off
 }
 EXPORT_SYMBOL(mem_write);
 
+int mem_memmap(struct device_d *dev, void **map, int flags)
+{
+	*map = dev->map_base;
+	return 0;
+}
+EXPORT_SYMBOL(mem_memmap);
+
diff --git a/include/driver.h b/include/driver.h
index e2b6d669dc..d4e7c132c9 100644
--- a/include/driver.h
+++ b/include/driver.h
@@ -240,6 +240,7 @@ int     dev_memmap(struct device_d *dev, void **map, int flags);
 /* These are used by drivers which work with direct memory accesses */
 ssize_t mem_read(struct device_d *dev, void *buf, size_t count, ulong offset, ulong flags);
 ssize_t mem_write(struct device_d *dev, const void *buf, size_t count, ulong offset, ulong flags);
+int mem_memmap(struct device_d *dev, void **map, int flags);
 
 /* Use this if you have nothing to do in your drivers probe function */
 int dummy_probe(struct device_d *);