[patch 5/5] [RFC] Add MMC password protection (lock/unlock) support

[Anderson Briglia]

The MMC_LOCK_UNLOCK command requires the block length to be exactly the
password length + 2 bytes, but hardware-specific drivers force a "power of 2"
block size.

This patch sends the exact block size (password + 2 bytes) to the host. OMAP
specific.

Signed-off-by: Anderson Briglia <anderson.briglia@xxxxxxxxxxx>
Signed-off-by: Anderson Lizardo <anderson.lizardo@xxxxxxxxxxx>
Signed-off-by: Carlos Eduardo Aguiar <carlos.aguiar@xxxxxxxxxxx>

Index: linux-2.6.14-omap2/drivers/mmc/omap.c
===================================================================
--- linux-2.6.14-omap2.orig/drivers/mmc/omap.c	2005-12-09 11:31:50.000000000 -0400
+++ linux-2.6.14-omap2/drivers/mmc/omap.c	2005-12-12 14:56:08.000000000 -0400
@@ -891,8 +891,12 @@ mmc_omap_prepare_data(struct mmc_omap_ho
 		return;
 	}
 
-
-	block_size = 1 << data->blksz_bits;
+	/*  password protection: we need to send the exact block size to the
+	 *  card (password + 2), not a 2-exponent. */
+	if (req->cmd->opcode == MMC_LOCK_UNLOCK)
+		block_size = data->sg[0].length;
+	else
+		block_size = 1 << data->blksz_bits;
 
 	OMAP_MMC_WRITE(host->base, NBLK, data->blocks - 1);
 	OMAP_MMC_WRITE(host->base, BLEN, block_size - 1);

--
Anderson Briglia,
Anderson Lizardo,
Carlos Eduardo Aguiar

Embedded Linux Lab - 10LE
Nokia Institute of Technology - INdT
Manaus - Brazil