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Subject[PATCH 3/3] mmc: Support FFU for eMMC v5.0
Date

Add support of FFU for eMMC v5.0


Signed-off-by: Avi Shchislowski <avi.shchislowski@sandisk.com>


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/block.c b/drivers/mmc/card/block.c
index ede41f0..68997f2 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -480,6 +480,11 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev,
goto cmd_done;
}

+ if (idata->ic.opcode == MMC_FFU_INVOKE_OP) {
+ err = mmc_ffu_invoke(card, idata->buf);
+ goto cmd_done;
+ }
+
cmd.opcode = idata->ic.opcode;
cmd.arg = idata->ic.arg;
cmd.flags = idata->ic.flags;
diff --git a/drivers/mmc/core/Makefile b/drivers/mmc/core/Makefile
index 38ed210..f2fdfd4 100644
--- a/drivers/mmc/core/Makefile
+++ b/drivers/mmc/core/Makefile
@@ -10,3 +10,4 @@ mmc_core-y := core.o bus.o host.o \
quirks.o slot-gpio.o

mmc_core-$(CONFIG_DEBUG_FS) += debugfs.o
+obj-$(CONFIG_MMC_FFU) += mmc_ffu.o
diff --git a/drivers/mmc/core/mmc_ffu.c b/drivers/mmc/core/mmc_ffu.c
new file mode 100644
index 0000000..817a58d
--- /dev/null
+++ b/drivers/mmc/core/mmc_ffu.c
@@ -0,0 +1,487 @@
+/*
+ * * ffu.c
+ *
+ * Copyright 2007-2008 Pierre Ossman
+ *
+ * Modified by SanDisk Corp., Copyright © 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/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 sg_table sgtable;
+};
+
+/*
+ * Map memory into a scatterlist.
+ */
+static unsigned int mmc_ffu_map_sg(struct mmc_ffu_mem *mem, int size,
+ struct scatterlist *sglist)
+{
+ struct scatterlist *sg = sglist;
+ unsigned int i;
+ unsigned long sz = size;
+ unsigned int sctr_len = 0;
+ unsigned long len;
+
+ for (i = 0; i < mem->cnt && sz; i++, sz -= len) {
+ len = PAGE_SIZE << 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++;
+ }
+
+ 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);
+}
+
+/*
+ * Cleanup struct mmc_ffu_area.
+ */
+static int mmc_ffu_area_cleanup(struct mmc_ffu_area *area)
+{
+ sg_free_table(&area->sgtable);
+ 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 int mmc_ffu_alloc_mem(struct mmc_ffu_area *area, unsigned long min_sz)
+{
+ unsigned long max_page_cnt = DIV_ROUND_UP(area->max_tfr, PAGE_SIZE);
+ unsigned long min_page_cnt = DIV_ROUND_UP(min_sz, PAGE_SIZE);
+ unsigned long max_seg_page_cnt =
+ DIV_ROUND_UP(area->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;
+
+ gfp_t flags = GFP_KERNEL | GFP_DMA | __GFP_NOWARN | __GFP_NORETRY;
+
+ if (max_page_cnt > limit) {
+ max_page_cnt = limit;
+ area->max_tfr = max_page_cnt * PAGE_SIZE;
+ }
+
+ if (min_page_cnt > max_page_cnt)
+ min_page_cnt = max_page_cnt;
+
+ if (area->max_segs * max_seg_page_cnt > max_page_cnt)
+ area->max_segs = DIV_ROUND_UP(max_page_cnt, max_seg_page_cnt);
+
+ area->mem.arr = kzalloc(sizeof(struct mmc_ffu_pages) * area->max_segs,
+ GFP_KERNEL);
+ area->mem.cnt = 0;
+ if (!area->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;
+
+ area->mem.arr[area->mem.cnt].page = page;
+ area->mem.arr[area->mem.cnt].order = order;
+ area->mem.cnt++;
+ page_cnt += 1UL << order;
+ if (max_page_cnt <= (1UL << order))
+ break;
+ max_page_cnt -= 1UL << order;
+ }
+
+ if (page_cnt < min_page_cnt)
+ goto out_free;
+
+ return 0;
+
+out_free:
+ mmc_ffu_free_mem(&area->mem);
+ return -ENOMEM;
+}
+
+/*
+ * 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,
+ const u8 *data)
+{
+ int ret;
+ int i;
+ unsigned int length = 0, page_length;
+
+ ret = mmc_ffu_alloc_mem(area, 1);
+ for (i = 0; i < area->mem.cnt; i++) {
+ if (length > area->max_tfr) {
+ ret = -EINVAL;
+ goto out_free;
+ }
+ page_length = PAGE_SIZE << area->mem.arr[i].order;
+ memcpy(page_address(area->mem.arr[i].page), data + length,
+ min(area->max_tfr - length, page_length));
+ length += page_length;
+ }
+
+ ret = sg_alloc_table(&area->sgtable, area->mem.cnt, GFP_KERNEL);
+ if (ret)
+ goto out_free;
+
+ area->sg_len = mmc_ffu_map_sg(&area->mem, area->max_tfr,
+ area->sgtable.sgl);
+
+
+ return 0;
+
+out_free:
+ mmc_ffu_free_mem(&area->mem);
+ return ret;
+}
+
+static int mmc_ffu_write(struct mmc_card *card, const u8 *src, u32 arg,
+ int size)
+{
+ int rc;
+ struct mmc_ffu_area area = {0};
+ int block_size = card->ext_csd.data_sector_size;
+
+ area.max_segs = card->host->max_segs;
+ area.max_seg_sz = card->host->max_seg_size & ~(block_size - 1);
+
+ do {
+ area.max_tfr = size;
+ if (area.max_tfr >> 9 > card->host->max_blk_count)
+ area.max_tfr = card->host->max_blk_count << 9;
+ if (area.max_tfr > card->host->max_req_size)
+ area.max_tfr = card->host->max_req_size;
+ if (DIV_ROUND_UP(area.max_tfr, area.max_seg_sz) > area.max_segs)
+ area.max_tfr = area.max_segs * area.max_seg_sz;
+
+ rc = mmc_ffu_area_init(&area, card, src);
+ if (rc != 0)
+ goto exit;
+
+ rc = mmc_simple_transfer(card, area.sgtable.sgl, area.sg_len,
+ arg, area.max_tfr / block_size, block_size, 1);
+ mmc_ffu_area_cleanup(&area);
+ if (rc != 0) {
+ pr_err("%s mmc_ffu_simple_transfer %d\n", __func__, rc);
+ goto exit;
+ }
+ src += area.max_tfr;
+ size -= area.max_tfr;
+
+ } while (size > 0);
+
+exit:
+ 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;
+
+ 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;
+}
+
+static int mmc_ffu_switch_mode(struct mmc_card *card , int mode)
+{
+ int err = 0;
+ int offset;
+
+ switch (mode) {
+ case MMC_FFU_MODE_SET:
+ case MMC_FFU_MODE_NORMAL:
+ offset = EXT_CSD_MODE_CONFIG;
+ break;
+ case MMC_FFU_INSTALL_SET:
+ offset = EXT_CSD_MODE_OPERATION_CODES;
+ mode = 0x1;
+ break;
+ default:
+ err = -EINVAL;
+ break;
+ }
+
+ if (err == 0) {
+ err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+ offset, mode,
+ card->ext_csd.generic_cmd6_time);
+ }
+
+ return err;
+}
+
+static int mmc_ffu_install(struct mmc_card *card, u8 *ext_csd)
+{
+ int err;
+ u32 timeout;
+
+ /* check mode operation */
+ if (!card->ext_csd.ffu_mode_op) {
+ /* host switch back to work in normal MMC Read/Write commands */
+ err = mmc_ffu_switch_mode(card, MMC_FFU_MODE_NORMAL);
+ if (err) {
+ pr_err("FFU: %s: switch to normal mode error %d:\n",
+ mmc_hostname(card->host), err);
+ return err;
+ }
+
+ /* restart the eMMC */
+ err = mmc_ffu_restart(card);
+ if (err) {
+ pr_err("FFU: %s: install error %d:\n",
+ mmc_hostname(card->host), err);
+ return err;
+ }
+ } else {
+ 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 = DIV_ROUND_UP((100 * (1 << timeout)), 1000);
+
+ /* set ext_csd to install mode */
+ err = mmc_ffu_switch_mode(card, MMC_FFU_INSTALL_SET);
+ if (err) {
+ pr_err("FFU: %s: error %d setting install mode\n",
+ mmc_hostname(card->host), err);
+ return err;
+ }
+ }
+
+ /* 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);
+ return err;
+ }
+
+ /* 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);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+int mmc_ffu_invoke(struct mmc_card *card, const char *name)
+{
+ u8 ext_csd[512];
+ int err;
+ u32 arg;
+ u32 fw_prog_bytes;
+ const struct firmware *fw;
+ int block_size = card->ext_csd.data_sector_size;
+
+ /* Check if FFU is supported */
+ if (!card->ext_csd.ffu_capable) {
+ pr_err("FFU: %s: error FFU is not supported %d rev %d\n",
+ mmc_hostname(card->host), card->ext_csd.ffu_capable,
+ card->ext_csd.rev);
+ return -EOPNOTSUPP;
+ }
+
+ if (strlen(name) > 512) {
+ pr_err("FFU: %s: %.20s is not a valid argument\n",
+ mmc_hostname(card->host), name);
+ return -EINVAL;
+ }
+
+ /* setup FW data buffer */
+ err = request_firmware(&fw, name, &card->dev);
+ if (err) {
+ pr_err("FFU: %s: Firmware request failed %d\n",
+ mmc_hostname(card->host), err);
+ return err;
+ }
+ if ((fw->size % block_size)) {
+ pr_warn("FFU: %s: Warning %zd firmware data size "
+ "is not aligned!!!\n", mmc_hostname(card->host),
+ fw->size);
+ }
+
+ mmc_get_card(card);
+
+ /* trigger flushing*/
+ err = mmc_flush_cache(card);
+ if (err) {
+ pr_err("FFU: %s: error %d flushing data\n",
+ mmc_hostname(card->host), err);
+ goto exit;
+ }
+
+ /* 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;
+ }
+
+ /* set CMD ARG */
+ 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;
+
+ /* set device to FFU mode */
+ err = mmc_ffu_switch_mode(card, MMC_FFU_MODE_SET);
+ if (err) {
+ pr_err("FFU: %s: error %d FFU is not supported\n",
+ mmc_hostname(card->host), err);
+ goto exit;
+ }
+
+ err = mmc_ffu_write(card, fw->data, arg, fw->size);
+ if (err) {
+ pr_err("FFU: %s: write error %d\n",
+ mmc_hostname(card->host), err);
+ goto exit;
+ }
+ /* payload will be checked only in op_mode supported */
+ if (card->ext_csd.ffu_mode_op) {
+ /* 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 that the eMMC has received the payload */
+ fw_prog_bytes = 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;
+
+ /* convert sectors to bytes: multiply by -512B or 4KB as
+ required by the card */
+ fw_prog_bytes *=
+ block_size << (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] * 3);
+ if (fw_prog_bytes != fw->size) {
+ err = -EINVAL;
+ pr_err("FFU: %s: error %d number of programmed fw sector "
+ "incorrect %d %zd\n", __func__, err,
+ fw_prog_bytes, fw->size);
+ goto exit;
+ }
+ }
+
+ err = mmc_ffu_install(card, ext_csd);
+ if (err) {
+ pr_err("FFU: %s: error firmware install %d\n",
+ mmc_hostname(card->host), err);
+ goto exit;
+ }
+
+exit:
+ if (err != 0) {
+ /* host switch back to work in normal MMC
+ * Read/Write commands */
+ mmc_ffu_switch_mode(card, MMC_FFU_MODE_NORMAL);
+ }
+ release_firmware(fw);
+ mmc_put_card(card);
+ return err;
+}
+EXPORT_SYMBOL(mmc_ffu_invoke);
diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index 92540d0..44fea6d 100644
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -220,4 +220,26 @@ struct device_node;
extern u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max);
extern int mmc_of_parse_voltage(struct device_node *np, u32 *mask);

+/*
+ * eMMC5.0 Field Firmware Update (FFU) opcodes
+*/
+#define MMC_FFU_INVOKE_OP 302
+
+#define MMC_FFU_MODE_SET 0x1
+#define MMC_FFU_MODE_NORMAL 0x0
+#define MMC_FFU_INSTALL_SET 0x2
+
+#ifdef CONFIG_MMC_FFU
+#define MMC_FFU_FEATURES 0x1
+#define FFU_FEATURES(ffu_features) (ffu_features & MMC_FFU_FEATURES)
+
+int mmc_ffu_invoke(struct mmc_card *card, const char *name);
+
+#else
+static inline int mmc_ffu_invoke(struct mmc_card *card, const char *name)
+{
+ return -ENOSYS;
+}
+#endif
+
#endif /* LINUX_MMC_CORE_H */
--
1.7.9.5
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