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Subject[patch 2/5] Add MMC password protection (lock/unlock) support V2
Implement card lock/unlock card operation, using the MMC_LOCK_UNLOCK command.

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

Index: linux-2.6.15-rc4-omap1/drivers/mmc/mmc.c
===================================================================
--- linux-2.6.15-rc4-omap1.orig/drivers/mmc/mmc.c 2005-12-28 14:18:18.000000000 -0400
+++ linux-2.6.15-rc4-omap1/drivers/mmc/mmc.c 2005-12-28 14:20:30.000000000 -0400
@@ -4,6 +4,8 @@
* Copyright (C) 2003-2004 Russell King, All Rights Reserved.
* SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
* SD support Copyright (C) 2005 Pierre Ossman, All Rights Reserved.
+ * MMC password protection (C) 2005 Instituto Nokia de Tecnologia (INdT),
+ * All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -20,6 +22,7 @@
#include <linux/err.h>
#include <asm/scatterlist.h>
#include <linux/scatterlist.h>
+#include <linux/key.h>

#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
@@ -1088,6 +1091,159 @@ static void mmc_setup(struct mmc_host *h
mmc_read_scrs(host);
}

+static int pop(unsigned x)
+{
+ x = x - ((x >> 1) & 0x55555555);
+ x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
+ x = (x + (x >> 4)) & 0x0F0F0F0F;
+ x = x + (x >> 8);
+ x = x + (x >> 16);
+
+ return x & 0x0000003F;
+}
+
+static int ilog2(unsigned x)
+{
+ x = x | (x >> 1);
+ x = x | (x >> 2);
+ x = x | (x >> 4);
+ x = x | (x >> 8);
+ x = x | (x >> 16);
+
+ return pop(x) - 1;
+}
+
+/* Calculate the minimal blksz_bits to hold x bytes. The two math functions
+ * above are used to do the calculation.
+ *
+ * XXX There must be a simpler way to do this... */
+static inline int blksz_bits(unsigned x)
+{
+ return 1 + ilog2(x - 1);
+}
+
+/**
+ * mmc_lock_unlock - send LOCK_UNLOCK command to a specific card.
+ * @card: card to which the LOCK_UNLOCK command should be sent
+ * @key: key containing the MMC password
+ * @mode: LOCK_UNLOCK mode
+ *
+ */
+int mmc_lock_unlock(struct mmc_card *card, struct key *key, int mode)
+{
+ struct mmc_request mrq;
+ struct mmc_command cmd;
+ struct mmc_data data;
+ struct scatterlist sg;
+ struct mmc_key_payload *mpayload;
+ unsigned long erase_timeout;
+ int err, data_size;
+ u8 *data_buf;
+
+ mpayload = NULL;
+ data_size = 1;
+ if (mode != MMC_LOCK_MODE_ERASE) {
+ mpayload = rcu_dereference(key->payload.data);
+ data_size = 2 + mpayload->datalen;
+ }
+
+ data_buf = kmalloc(data_size, GFP_KERNEL);
+ if (!data_buf)
+ return -ENOMEM;
+ memset(data_buf, 0, data_size);
+
+ data_buf[0] = mode;
+ if (mode != MMC_LOCK_MODE_ERASE) {
+ data_buf[1] = mpayload->datalen;
+ memcpy(data_buf + 2, mpayload->data, mpayload->datalen);
+ }
+
+ err = mmc_card_claim_host(card);
+ if (err != MMC_ERR_NONE) {
+ mmc_card_set_dead(card);
+ goto out;
+ }
+
+ memset(&cmd, 0, sizeof(struct mmc_command));
+
+ cmd.opcode = MMC_SET_BLOCKLEN;
+ cmd.arg = data_size;
+ cmd.flags = MMC_RSP_R1;
+ err = mmc_wait_for_cmd(card->host, &cmd, CMD_RETRIES);
+ if (err != MMC_ERR_NONE) {
+ mmc_card_set_dead(card);
+ goto error;
+ }
+
+ memset(&cmd, 0, sizeof(struct mmc_command));
+
+ cmd.opcode = MMC_LOCK_UNLOCK;
+ cmd.arg = 0;
+ cmd.flags = MMC_RSP_R1B;
+
+ memset(&data, 0, sizeof(struct mmc_data));
+
+ data.timeout_ns = card->csd.tacc_ns * 10;
+ data.timeout_clks = card->csd.tacc_clks * 10;
+ data.blksz_bits = blksz_bits(data_size);
+ data.blocks = 1;
+ data.flags = MMC_DATA_WRITE;
+ data.sg = &sg;
+ data.sg_len = 1;
+
+ memset(&mrq, 0, sizeof(struct mmc_request));
+
+ mrq.cmd = &cmd;
+ mrq.data = &data;
+
+ sg_init_one(&sg, data_buf, data_size);
+ err = mmc_wait_for_req(card->host, &mrq);
+ if (err != MMC_ERR_NONE) {
+ mmc_card_set_dead(card);
+ goto error;
+ }
+
+ memset(&cmd, 0, sizeof(struct mmc_command));
+
+ cmd.opcode = MMC_SEND_STATUS;
+ cmd.arg = card->rca << 16;
+ cmd.flags = MMC_RSP_R1;
+
+ /* set timeout for forced erase operation to 3 min. (see MMC spec) */
+ erase_timeout = jiffies + 180 * HZ;
+ do {
+ /* we cannot use "retries" here because the
+ * R1_LOCK_UNLOCK_FAILED bit is cleared by subsequent reads to
+ * the status register, hiding the error condition */
+ err = mmc_wait_for_cmd(card->host, &cmd, 0);
+ if (err != MMC_ERR_NONE)
+ break;
+ /* the other modes don't need timeout checking */
+ if (mode != MMC_LOCK_MODE_ERASE)
+ continue;
+ if (time_after(jiffies, erase_timeout)) {
+ dev_dbg(&card->dev, "forced erase timed out\n");
+ err = MMC_ERR_TIMEOUT;
+ break;
+ }
+ } while (!(cmd.resp[0] & R1_READY_FOR_DATA));
+ if (cmd.resp[0] & R1_LOCK_UNLOCK_FAILED) {
+ dev_dbg(&card->dev, "LOCK_UNLOCK operation failed\n");
+ err = MMC_ERR_FAILED;
+ }
+
+error:
+ mmc_check_cards(card->host);
+ mmc_deselect_cards(card->host);
+ mmc_card_release_host(card);
+out:
+ kfree(data_buf);
+
+ return err;
+}
+
+EXPORT_SYMBOL(mmc_lock_unlock);
+

/**
* mmc_detect_change - process change of state on a MMC socket
Index: linux-2.6.15-rc4-omap1/include/linux/mmc/card.h
===================================================================
--- linux-2.6.15-rc4-omap1.orig/include/linux/mmc/card.h 2005-12-28 14:18:18.000000000 -0400
+++ linux-2.6.15-rc4-omap1/include/linux/mmc/card.h 2005-12-28 14:33:31.000000000 -0400
@@ -109,4 +109,7 @@ static inline int mmc_card_claim_host(st

#define mmc_card_release_host(c) mmc_release_host((c)->host)

+struct key;
+extern int mmc_lock_unlock(struct mmc_card *card, struct key *key, int mode);
+
#endif
Index: linux-2.6.15-rc4-omap1/include/linux/mmc/protocol.h
===================================================================
--- linux-2.6.15-rc4-omap1.orig/include/linux/mmc/protocol.h 2005-12-28 14:18:18.000000000 -0400
+++ linux-2.6.15-rc4-omap1/include/linux/mmc/protocol.h 2005-12-28 14:20:30.000000000 -0400
@@ -243,5 +243,13 @@ struct _mmc_csd {
#define SD_BUS_WIDTH_1 0
#define SD_BUS_WIDTH_4 2

+/*
+ * MMC_LOCK_UNLOCK modes
+ */
+#define MMC_LOCK_MODE_ERASE (1<<3)
+#define MMC_LOCK_MODE_UNLOCK (0<<2)
+#define MMC_LOCK_MODE_CLR_PWD (1<<1)
+#define MMC_LOCK_MODE_SET_PWD (1<<0)
+
#endif /* MMC_MMC_PROTOCOL_H */

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