[RFC PATCH 1/1 v7]mmc: Support-FFU-for-eMMC-v5.0

[Avi Shchislowski <Avi.Shchislowski@sandisk.com>]

The Field Firmware Update (FFU) feature is new for eMMC 5.0 spec (Jedec: JESD84-B50.pdf)
  http://www.jedec.org/standards-documents/technology-focus-areas/flash-memory-ssds-ufs-emmc/e-mmc
  
An ioctl has been added to provide the new firmware image's file name to the  mmc driver and udev is then used to retrieve its data.

Two new ioctls have been added:
1. FFU download firmware - transfer the new firmware data from user space to the eMMC device
2. FFU install - initializes the new firmware update


Signed-off-by: Avi Shchislowski <avi.shchislowski@sandisk.com>
Signed-off-by: Alex Lemberg <alex.lemberg@sandisk.com>

---
V7:
- fixed mangled white space

V5:
- provides udev (request_firmware) implementation as advised in patch
v2 comments.

diff --git a/drivers/mmc/card/Kconfig b/drivers/mmc/card/Kconfig index 5562308..19ba729 100644
--- a/drivers/mmc/card/Kconfig
+++ b/drivers/mmc/card/Kconfig
@@ -68,3 +68,11 @@ config MMC_TEST
 
 	  This driver is only of interest to those developing or
 	  testing a host driver. Most people should say N here.
+
+config MMC_FFU
+	bool "FFU SUPPORT"
+	depends on MMC != n
+	help
+	  This is an option to run firmware update on eMMC 5.0.
+	  Field firmware updates (FFU) enables features enhancment
+	  in the field.
diff --git a/drivers/mmc/card/Makefile b/drivers/mmc/card/Makefile index c73b406..1e9223b 100644
--- a/drivers/mmc/card/Makefile
+++ b/drivers/mmc/card/Makefile
@@ -8,3 +8,4 @@ obj-$(CONFIG_MMC_TEST)		+= mmc_test.o
 
 obj-$(CONFIG_SDIO_UART)		+= sdio_uart.o
 
+obj-$(CONFIG_MMC_FFU)		+= ffu.o
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c index 7b5424f..8311200 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -41,6 +41,7 @@
 #include <linux/mmc/host.h>
 #include <linux/mmc/mmc.h>
 #include <linux/mmc/sd.h>
+#include <linux/mmc/ffu.h>
 
 #include <asm/uaccess.h>
 
@@ -525,6 +526,17 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 
 	mmc_get_card(card);
 
+	if (cmd.opcode == MMC_FFU_DOWNLOAD_OP) {
+		err = mmc_ffu_download(card, &cmd , idata->buf,
+			idata->buf_bytes);
+		goto cmd_rel_host;
+	}
+
+	if (cmd.opcode == MMC_FFU_INSTALL_OP) {
+		err = mmc_ffu_install(card);
+		goto cmd_rel_host;
+	}
+
 	err = mmc_blk_part_switch(card, md);
 	if (err)
 		goto cmd_rel_host;
diff --git a/drivers/mmc/card/ffu.c b/drivers/mmc/card/ffu.c new file mode 100644 index 0000000..7d254fd
--- /dev/null
+++ b/drivers/mmc/card/ffu.c
@@ -0,0 +1,595 @@
+/*
+ * *  ffu.c
+ *
+ *  Copyright 2007-2008 Pierre Ossman
+ *
+ *  Modified by SanDisk Corp., Copyright (c) 2013 SanDisk Corp.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or 
+(at
+ * your option) any later version.
+ *
+ * This program includes bug.h, card.h, host.h, mmc.h, scatterlist.h,
+ * slab.h, ffu.h & swap.h header files
+ * The original, unmodified version of this program - the mmc_test.c
+ * file - is obtained under the GPL v2.0 license that is available via
+ * http://www.gnu.org/licenses/,
+ * or http://www.opensource.org/licenses/gpl-2.0.php
+*/
+
+#include <linux/bug.h>
+#include <linux/errno.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
+#include <linux/scatterlist.h>
+#include <linux/slab.h>
+#include <linux/swap.h>
+#include <linux/mmc/ffu.h>
+#include <linux/firmware.h>
+
+/**
+ * struct mmc_ffu_pages - pages allocated by 'alloc_pages()'.
+ * @page: first page in the allocation
+ * @order: order of the number of pages allocated  */ struct 
+mmc_ffu_pages {
+	struct page *page;
+	unsigned int order;
+};
+
+/**
+ * struct mmc_ffu_mem - allocated memory.
+ * @arr: array of allocations
+ * @cnt: number of allocations
+ */
+struct mmc_ffu_mem {
+	struct mmc_ffu_pages *arr;
+	unsigned int cnt;
+};
+
+struct mmc_ffu_area {
+	unsigned long max_sz;
+	unsigned int max_tfr;
+	unsigned int max_segs;
+	unsigned int max_seg_sz;
+	unsigned int blocks;
+	unsigned int sg_len;
+	struct mmc_ffu_mem *mem;
+	struct scatterlist *sg;
+};
+
+static void mmc_ffu_prepare_mrq(struct mmc_card *card,
+	struct mmc_request *mrq, struct scatterlist *sg, unsigned int sg_len,
+	u32 arg, unsigned int blocks, unsigned int blksz, int write) {
+	BUG_ON(!mrq || !mrq->cmd || !mrq->data || !mrq->stop);
+
+	if (blocks > 1) {
+		mrq->cmd->opcode = write ?
+			MMC_WRITE_MULTIPLE_BLOCK : MMC_READ_MULTIPLE_BLOCK;
+	} else {
+		mrq->cmd->opcode = write ? MMC_WRITE_BLOCK :
+			MMC_READ_SINGLE_BLOCK;
+	}
+
+	mrq->cmd->arg = arg;
+	if (!mmc_card_blockaddr(card))
+		mrq->cmd->arg <<= 9;
+
+	mrq->cmd->flags = MMC_RSP_R1 | MMC_CMD_ADTC;
+	if (blocks == 1) {
+		mrq->stop = NULL;
+	} else {
+		mrq->stop->opcode = MMC_STOP_TRANSMISSION;
+		mrq->stop->arg = 0;
+		mrq->stop->flags = MMC_RSP_R1B | MMC_CMD_AC;
+	}
+
+	mrq->data->blksz = blksz;
+	mrq->data->blocks = blocks;
+	mrq->data->flags = write ? MMC_DATA_WRITE : MMC_DATA_READ;
+	mrq->data->sg = sg;
+	mrq->data->sg_len = sg_len;
+
+	mmc_set_data_timeout(mrq->data, card); }
+
+/*
+ * Checks that a normal transfer didn't have any errors  */ static int 
+mmc_ffu_check_result(struct mmc_request *mrq) {
+	BUG_ON(!mrq || !mrq->cmd || !mrq->data);
+
+	if (mrq->cmd->error != 0)
+		return -EINVAL;
+
+	if (mrq->data->error != 0)
+		return -EINVAL;
+
+	if (mrq->stop != NULL && mrq->stop->error != 0)
+		return -1;
+
+	if (mrq->data->bytes_xfered != (mrq->data->blocks * mrq->data->blksz))
+		return -EINVAL;
+
+	return 0;
+}
+
+static int mmc_ffu_busy(struct mmc_command *cmd) {
+	return !(cmd->resp[0] & R1_READY_FOR_DATA) ||
+		(R1_CURRENT_STATE(cmd->resp[0]) == R1_STATE_PRG); }
+
+static int mmc_ffu_wait_busy(struct mmc_card *card) {
+	int ret, busy = 0;
+	struct mmc_command cmd = {0};
+
+	memset(&cmd, 0, sizeof(struct mmc_command));
+	cmd.opcode = MMC_SEND_STATUS;
+	cmd.arg = card->rca << 16;
+	cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
+
+	do {
+		ret = mmc_wait_for_cmd(card->host, &cmd, 0);
+		if (ret)
+			break;
+
+		if (!busy && mmc_ffu_busy(&cmd)) {
+			busy = 1;
+			if (card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) {
+				pr_warn("%s: Warning: Host did not "
+					"wait for busy state to end.\n",
+					mmc_hostname(card->host));
+			}
+		}
+
+	} while (mmc_ffu_busy(&cmd));
+
+	return ret;
+}
+
+/*
+ * transfer with certain parameters
+ */
+static int mmc_ffu_simple_transfer(struct mmc_card *card,
+	struct scatterlist *sg, unsigned int sg_len, u32 arg,
+	unsigned int blocks, unsigned int blksz, int write) {
+	struct mmc_request mrq = {0};
+	struct mmc_command cmd = {0};
+	struct mmc_command stop = {0};
+	struct mmc_data data = {0};
+
+	mrq.cmd = &cmd;
+	mrq.data = &data;
+	mrq.stop = &stop;
+	mmc_ffu_prepare_mrq(card, &mrq, sg, sg_len, arg, blocks, blksz,
+		write);
+	mmc_wait_for_req(card->host, &mrq);
+
+	mmc_ffu_wait_busy(card);
+
+	return mmc_ffu_check_result(&mrq);
+}
+
+/*
+ * Map memory into a scatterlist.
+ */
+static unsigned int mmc_ffu_map_sg(struct mmc_ffu_mem *mem, int size,
+	struct scatterlist *sglist, unsigned int max_segs,
+	unsigned int max_seg_sz)
+{
+	struct scatterlist *sg = sglist;
+	unsigned int i;
+	unsigned long sz = size;
+	unsigned int sctr_len = 0;
+	unsigned long len;
+
+	sg_init_table(sglist, max_segs);
+
+	for (i = 0; i < mem->cnt && sz; i++, sz -= len) {
+		len = PAGE_SIZE * (1 << mem->arr[i].order);
+
+		if (len > sz) {
+			len = sz;
+			sz = 0;
+		}
+
+		sg_set_page(sg, mem->arr[i].page, len, 0);
+		sg = sg_next(sg);
+		sctr_len += 1;
+	}
+	sg_mark_end(sg);
+
+	return sctr_len;
+}
+
+static void mmc_ffu_free_mem(struct mmc_ffu_mem *mem) {
+	if (!mem)
+		return;
+
+	while (mem->cnt--)
+		__free_pages(mem->arr[mem->cnt].page, mem->arr[mem->cnt].order);
+
+	kfree(mem->arr);
+	kfree(mem);
+}
+
+/*
+ * Cleanup struct mmc_ffu_area.
+ */
+static int mmc_ffu_area_cleanup(struct mmc_ffu_area *area) {
+	kfree(area->sg);
+	mmc_ffu_free_mem(area->mem);
+
+	return 0;
+}
+
+/*
+ * Allocate a lot of memory, preferably max_sz but at least min_sz. In 
+case
+ * there isn't much memory do not exceed 1/16th total low mem pages. 
+Also do
+ * not exceed a maximum number of segments and try not to make segments 
+much
+ * bigger than maximum segment size.
+ */
+static struct mmc_ffu_mem *mmc_ffu_alloc_mem(unsigned long min_sz,
+	unsigned long max_sz, unsigned int max_segs, unsigned int max_seg_sz) 
+{
+	unsigned long max_page_cnt = DIV_ROUND_UP(max_sz, PAGE_SIZE);
+	unsigned long min_page_cnt = DIV_ROUND_UP(min_sz, PAGE_SIZE);
+	unsigned long max_seg_page_cnt = DIV_ROUND_UP(max_seg_sz, PAGE_SIZE);
+	unsigned long page_cnt = 0;
+	/* we divide by 16 to ensure we will not allocate a big amount
+	 * of unnecessary pages */
+	unsigned long limit = nr_free_buffer_pages() >> 4;
+	struct mmc_ffu_mem *mem;
+	gfp_t flags = GFP_KERNEL | GFP_DMA | __GFP_NOWARN | __GFP_NORETRY;
+
+	if (max_page_cnt > limit)
+		max_page_cnt = limit;
+
+	if (min_page_cnt > max_page_cnt)
+		min_page_cnt = max_page_cnt;
+
+	if (max_segs * max_seg_page_cnt > max_page_cnt)
+		max_segs = DIV_ROUND_UP(max_page_cnt, max_seg_page_cnt);
+
+	mem = kzalloc(sizeof(struct mmc_ffu_mem), GFP_KERNEL);
+	if (!mem)
+		return NULL;
+
+	mem->arr = kzalloc(sizeof(struct mmc_ffu_pages) * max_segs,
+		GFP_KERNEL);
+	if (!mem->arr)
+		goto out_free;
+
+	while (max_page_cnt) {
+		struct page *page;
+		unsigned int order;
+
+		order = get_order(max_seg_page_cnt << PAGE_SHIFT);
+
+		do {
+			page = alloc_pages(flags, order);
+		} while (!page && order--);
+
+		if (!page)
+			goto out_free;
+
+		mem->arr[mem->cnt].page = page;
+		mem->arr[mem->cnt].order = order;
+		mem->cnt += 1;
+		if (max_page_cnt <= (1UL << order))
+			break;
+		max_page_cnt -= 1UL << order;
+		page_cnt += 1UL << order;
+	}
+
+	if (page_cnt < min_page_cnt)
+		goto out_free;
+
+	return mem;
+
+out_free:
+	mmc_ffu_free_mem(mem);
+	return NULL;
+}
+
+/*
+ * Initialize an area for data transfers.
+ * Copy the data to the allocated pages.
+ */
+static int mmc_ffu_area_init(struct mmc_ffu_area *area, struct mmc_card *card,
+	u8 *data, int size)
+{
+	int ret;
+	int i;
+	int length = 0;
+
+	area->max_tfr = size;
+
+	/* Try to allocate enough memory for a max. sized transfer. Less is OK
+	 * because the same memory can be mapped into the scatterlist more than
+	 * once. Also, take into account the limits imposed on scatterlist
+	 * segments by the host driver.
+	 */
+	area->mem = mmc_ffu_alloc_mem(1, area->max_tfr, area->max_segs,
+		area->max_seg_sz);
+	if (!area->mem)
+		return -ENOMEM;
+
+	/* copy data to page */
+	for (i = 0; i < area->mem->cnt; i++) {
+		if (length > size) {
+			ret = -EINVAL;
+			goto out_free;
+		}
+
+		memcpy(page_address(area->mem->arr[i].page), data + length,
+			min(size - length, (int)area->max_seg_sz));
+		length += area->max_seg_sz;
+	}
+
+	area->sg = kmalloc(sizeof(struct scatterlist) * area->mem->cnt,
+		GFP_KERNEL);
+	if (!area->sg) {
+		ret = -ENOMEM;
+		goto out_free;
+	}
+
+	area->sg_len = mmc_ffu_map_sg(area->mem, size, area->sg,
+		area->max_segs, area->mem->cnt);
+
+	return 0;
+
+out_free:
+	mmc_ffu_area_cleanup(area);
+	return ret;
+}
+
+static int mmc_ffu_write(struct mmc_card *card, u8 *src, u32 arg,
+	int size)
+{
+	int rc;
+	struct mmc_ffu_area area;
+	int max_tfr;
+
+	area.sg = NULL;
+	area.mem = NULL;
+	area.max_segs = card->host->max_segs;
+	area.max_seg_sz = card->host->max_seg_size & ~(CARD_BLOCK_SIZE - 1);
+	do {
+		max_tfr = size;
+		if (max_tfr >> 9 > card->host->max_blk_count)
+			max_tfr = card->host->max_blk_count << 9;
+		if (max_tfr > card->host->max_req_size)
+			max_tfr = card->host->max_req_size;
+		if (DIV_ROUND_UP(max_tfr, area.max_seg_sz) > area.max_segs)
+			max_tfr = area.max_segs * area.max_seg_sz;
+
+		rc = mmc_ffu_area_init(&area, card, src, max_tfr);
+		if (rc != 0)
+			goto exit;
+
+		rc = mmc_ffu_simple_transfer(card, area.sg, area.sg_len, arg,
+			max_tfr / CARD_BLOCK_SIZE, CARD_BLOCK_SIZE, 1);
+		if (rc != 0)
+			goto exit;
+
+		src += max_tfr;
+		size -= max_tfr;
+	} while (size > 0);
+
+exit:
+	mmc_ffu_area_cleanup(&area);
+	return rc;
+}
+
+/* Flush all scheduled work from the MMC work queue.
+ * and initialize the MMC device */
+static int mmc_ffu_restart(struct mmc_card *card) {
+	struct mmc_host *host = card->host;
+	int err = 0;
+
+	mmc_cache_ctrl(host, 0);
+	err = mmc_power_save_host(host);
+	if (err) {
+		pr_warn("%s: going to sleep failed (%d)!!!\n",
+			__func__ , err);
+		goto exit;
+	}
+
+	err = mmc_power_restore_host(host);
+
+exit:
+
+	return err;
+}
+
+int mmc_ffu_download(struct mmc_card *card, struct mmc_command *cmd,
+	u8 *data, int buf_bytes)
+{
+	u8 ext_csd[CARD_BLOCK_SIZE];
+	int err;
+	int ret;
+	u8 *buf = NULL;
+	const struct firmware *fw;
+
+	/* Read the EXT_CSD */
+	err = mmc_send_ext_csd(card, ext_csd);
+	if (err) {
+		pr_err("FFU: %s: error %d sending ext_csd\n",
+			mmc_hostname(card->host), err);
+		goto exit;
+	}
+
+	/* check if card is eMMC 5.0 or higher */
+	if (card->ext_csd.rev < 7)
+		return -EINVAL;
+
+	/* Check if FFU is supported */
+	if (!FFU_SUPPORTED_MODE(ext_csd[EXT_CSD_SUPPORTED_MODE]) ||
+		FFU_CONFIG(ext_csd[EXT_CSD_FW_CONFIG])) {
+		err = -EINVAL;
+		pr_err("FFU: %s: error %d FFU is not supported\n",
+			mmc_hostname(card->host), err);
+		goto exit;
+	}
+
+	/* setup FW data buffer */
+	err = request_firmware(&fw, data, &card->dev);
+	if (err) {
+		pr_err("Firmware request failed %d\n", err);
+		goto exit_normal;
+	}
+
+	buf = kmalloc(fw->size, GFP_KERNEL);
+	if (buf == NULL) {
+		pr_err("Allocating memory for firmware failed!\n");
+		goto exit_normal;
+	}
+
+	if ((fw->size % CARD_BLOCK_SIZE)) {
+		pr_warn("FFU: %s: Warning %zd firmware data is not aligned!!!\n",
+			mmc_hostname(card->host), fw->size);
+	}
+
+	memcpy(buf, fw->data, fw->size);
+
+	/* set device to FFU mode */
+	err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_MODE_CONFIG,
+		MMC_FFU_MODE_SET, card->ext_csd.generic_cmd6_time);
+	if (err) {
+		pr_err("FFU: %s: error %d FFU is not supported\n",
+			mmc_hostname(card->host), err);
+		goto exit_normal;
+	}
+
+	/* set CMD ARG */
+	cmd->arg = ext_csd[EXT_CSD_FFU_ARG] |
+		ext_csd[EXT_CSD_FFU_ARG + 1] << 8 |
+		ext_csd[EXT_CSD_FFU_ARG + 2] << 16 |
+		ext_csd[EXT_CSD_FFU_ARG + 3] << 24;
+
+	err = mmc_ffu_write(card, buf, cmd->arg, (int)fw->size);
+
+exit_normal:
+	release_firmware(fw);
+	kfree(buf);
+
+	/* host switch back to work in normal MMC Read/Write commands */
+	ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+		EXT_CSD_MODE_CONFIG, MMC_FFU_MODE_NORMAL,
+		card->ext_csd.generic_cmd6_time);
+	if (ret)
+		err = ret;
+exit:
+	return err;
+}
+EXPORT_SYMBOL(mmc_ffu_download);
+
+int mmc_ffu_install(struct mmc_card *card) {
+	u8 ext_csd[CARD_BLOCK_SIZE];
+	int err;
+	u32 ffu_data_len;
+	u32 timeout;
+
+	err = mmc_send_ext_csd(card, ext_csd);
+	if (err) {
+		pr_err("FFU: %s: error %d sending ext_csd\n",
+			mmc_hostname(card->host), err);
+		goto exit;
+	}
+
+	/* Check if FFU is supported */
+	if (!FFU_SUPPORTED_MODE(ext_csd[EXT_CSD_SUPPORTED_MODE]) ||
+		FFU_CONFIG(ext_csd[EXT_CSD_FW_CONFIG])) {
+		err = -EINVAL;
+		pr_err("FFU: %s: error %d FFU is not supported\n",
+			mmc_hostname(card->host), err);
+		goto exit;
+	}
+
+	/* check mode operation */
+	if (!FFU_FEATURES(ext_csd[EXT_CSD_FFU_FEATURES])) {
+		/* restart the eMMC */
+		err = mmc_ffu_restart(card);
+		if (err) {
+			pr_err("FFU: %s: error %d FFU install:\n",
+				mmc_hostname(card->host), err);
+		}
+	} else {
+
+		ffu_data_len = ext_csd[EXT_CSD_NUM_OF_FW_SEC_PROG]|
+			ext_csd[EXT_CSD_NUM_OF_FW_SEC_PROG + 1] << 8 |
+			ext_csd[EXT_CSD_NUM_OF_FW_SEC_PROG + 2] << 16 |
+			ext_csd[EXT_CSD_NUM_OF_FW_SEC_PROG + 3] << 24;
+
+		if (!ffu_data_len) {
+			err = -EPERM;
+			return err;
+		}
+		/* set device to FFU mode */
+		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+			EXT_CSD_MODE_CONFIG, 0x1,
+			card->ext_csd.generic_cmd6_time);
+
+		if (err) {
+			pr_err("FFU: %s: error %d FFU is not supported\n",
+				mmc_hostname(card->host), err);
+			goto exit;
+		}
+
+		timeout = ext_csd[EXT_CSD_OPERATION_CODE_TIMEOUT];
+		if (timeout == 0 || timeout > 0x17) {
+			timeout = 0x17;
+			pr_warn("FFU: %s: operation code timeout is out "
+				"of range. Using maximum timeout.\n",
+				mmc_hostname(card->host));
+		}
+
+		/* timeout is at millisecond resolution */
+		timeout = (100 * (1 << timeout) / 1000) + 1;
+
+		/* set ext_csd to install mode */
+		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+			EXT_CSD_MODE_OPERATION_CODES,
+			MMC_FFU_INSTALL_SET, timeout);
+
+		if (err) {
+			pr_err("FFU: %s: error %d setting install mode\n",
+				mmc_hostname(card->host), err);
+			goto exit;
+		}
+	}
+
+	/* read ext_csd */
+	err = mmc_send_ext_csd(card, ext_csd);
+	if (err) {
+		pr_err("FFU: %s: error %d sending ext_csd\n",
+			mmc_hostname(card->host), err);
+		goto exit;
+	}
+
+	/* return status */
+	err = ext_csd[EXT_CSD_FFU_STATUS];
+	if (err) {
+		pr_err("FFU: %s: error %d FFU install:\n",
+			mmc_hostname(card->host), err);
+		err = -EINVAL;
+		goto exit;
+	}
+
+exit:
+	return err;
+}
+EXPORT_SYMBOL(mmc_ffu_install);
+
diff --git a/include/linux/mmc/ffu.h b/include/linux/mmc/ffu.h new file mode 100644 index 0000000..be70880
--- /dev/null
+++ b/include/linux/mmc/ffu.h
@@ -0,0 +1,63 @@
+/*
+ *
+ *  ffu.h
+ *
+ * Copyright (c) 2013 SanDisk Corp.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or 
+(at
+ * your option) any later version.
+ *
+ * This program was created by SanDisk Corp
+ * The ffu.h file is obtained under the GPL v2.0 license that is
+ * available via http://www.gnu.org/licenses/,
+ * or http://www.opensource.org/licenses/gpl-2.0.php
+*/
+
+#if !defined(_FFU_H_)
+#define _FFU_H_
+
+#include <linux/mmc/card.h>
+
+#define CARD_BLOCK_SIZE 512
+
+/*
+ * eMMC5.0 Field Firmware Update (FFU) opcodes */
+#define MMC_FFU_DOWNLOAD_OP 302 
+#define MMC_FFU_INSTALL_OP 303
+
+#define MMC_FFU_MODE_SET 0x1
+#define MMC_FFU_MODE_NORMAL 0x0
+#define MMC_FFU_INSTALL_SET 0x1
+
+#ifdef CONFIG_MMC_FFU
+#define MMC_FFU_ENABLE 0x0
+#define MMC_FFU_CONFIG 0x1
+#define MMC_FFU_SUPPORTED_MODES 0x1
+#define MMC_FFU_FEATURES 0x1
+
+#define FFU_ENABLED(ffu_enable)	(ffu_enable & MMC_FFU_CONFIG)
+#define FFU_SUPPORTED_MODE(ffu_sup_mode) \
+	(ffu_sup_mode && MMC_FFU_SUPPORTED_MODES) #define
+FFU_CONFIG(ffu_config) (ffu_config & MMC_FFU_CONFIG) #define
+FFU_FEATURES(ffu_fetures) (ffu_fetures & MMC_FFU_FEATURES)
+
+int mmc_ffu_download(struct mmc_card *card, struct mmc_command *cmd,
+	u8 *data, int buf_bytes);
+int mmc_ffu_install(struct mmc_card *card); #else static inline int 
+mmc_ffu_download(struct mmc_card *card,
+	struct mmc_command *cmd, u8 *data, int buf_bytes) {
+	return -ENOSYS;
+}
+static inline int mmc_ffu_install(struct mmc_card *card) {
+	return -ENOSYS;
+}
+
+#endif
+#endif /* FFU_H_ */
+
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h index 50bcde3..bf29e52 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -272,6 +272,9 @@ struct _mmc_csd {
  * EXT_CSD fields
  */
 
+#define EXT_CSD_FFU_STATUS		26	/* R */
+#define EXT_CSD_MODE_OPERATION_CODES	29	/* W */
+#define EXT_CSD_MODE_CONFIG		30	/* R/W */
 #define EXT_CSD_FLUSH_CACHE		32      /* W */
 #define EXT_CSD_CACHE_CTRL		33      /* R/W */
 #define EXT_CSD_POWER_OFF_NOTIFICATION	34	/* R/W */
@@ -290,6 +293,7 @@ struct _mmc_csd {
 #define EXT_CSD_SANITIZE_START		165     /* W */
 #define EXT_CSD_WR_REL_PARAM		166	/* RO */
 #define EXT_CSD_RPMB_MULT		168	/* RO */
+#define EXT_CSD_FW_CONFIG		169	/* R/W */
 #define EXT_CSD_BOOT_WP			173	/* R/W */
 #define EXT_CSD_ERASE_GROUP_DEF		175	/* R/W */
 #define EXT_CSD_PART_CONFIG		179	/* R/W */
@@ -325,6 +329,11 @@ struct _mmc_csd {
 #define EXT_CSD_POWER_OFF_LONG_TIME	247	/* RO */
 #define EXT_CSD_GENERIC_CMD6_TIME	248	/* RO */
 #define EXT_CSD_CACHE_SIZE		249	/* RO, 4 bytes */
+#define EXT_CSD_NUM_OF_FW_SEC_PROG	302	/* RO */
+#define EXT_CSD_FFU_ARG			487	/* RO, 4 bytes */
+#define EXT_CSD_OPERATION_CODE_TIMEOUT	491	/* RO */
+#define EXT_CSD_FFU_FEATURES		492	/* RO */
+#define EXT_CSD_SUPPORTED_MODE		493	/* RO */
 #define EXT_CSD_TAG_UNIT_SIZE		498	/* RO */
 #define EXT_CSD_DATA_TAG_SUPPORT	499	/* RO */
 #define EXT_CSD_MAX_PACKED_WRITES	500	/* RO */


--
To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at  http://vger.kernel.org/majordomo-info.html