[U-Boot] [PATCH v2] mmc: don't support write & erase for SPL builds

[Paul Burton]

On Sun 08 Sep 2013 09:48:20 BST, Andreas Bießmann wrote:
>
> Dear Paul Burton,
>
> On 06.09.13 15:43, Paul Burton wrote:
>>
>> For SPL builds this is just dead code since we'll only need to read.
>> Eliminating it results in a significant size reduction for the SPL
>> binary, which may be critical for certain platforms where the binary
>> size is highly constrained.
>>
>> Signed-off-by: Paul Burton <paul.burton at imgtec.com>
>> ---
>> Changes in v2:
>> - Move the mmc_bwrite & mmc_berase functions to a new mmc_write.c
>> file which is only compiled for non-SPL builds, as per a request
>> from Pantelis Antoniou. This requires that a few formerly static
>> functions in mmc.c be accessible to the new file, so they are
>> declared in a new mmc_private.h header along with the write &
>> erase functions. For what it's worth I prefered v1, but hey ho.
>> ---
>> drivers/mmc/Makefile | 2 +
>> drivers/mmc/mmc.c | 186 +--------------------------------------------
>> drivers/mmc/mmc_private.h | 45 +++++++++++
>> drivers/mmc/mmc_write.c | 189 
>> ++++++++++++++++++++++++++++++++++++++++++++++
>> 4 files changed, 240 insertions(+), 182 deletions(-)
>> create mode 100644 drivers/mmc/mmc_private.h
>> create mode 100644 drivers/mmc/mmc_write.c
>
>
> <snip>
>
>>
>> diff --git a/drivers/mmc/mmc_write.c b/drivers/mmc/mmc_write.c
>> new file mode 100644
>> index 0000000..dde5cf2
>> --- /dev/null
>> +++ b/drivers/mmc/mmc_write.c
>> @@ -0,0 +1,189 @@
>> +/*
>> + * Copyright 2008, Freescale Semiconductor, Inc
>> + * Andy Fleming
>> + *
>> + * Based vaguely on the Linux code
>> + *
>> + * SPDX-License-Identifier: GPL-2.0+
>> + */
>> +
>> +#include <config.h>
>> +#include <common.h>
>> +#include <part.h>
>> +#include "mmc_private.h"
>> +
>> +static ulong mmc_erase_t(struct mmc *mmc, ulong start, lbaint_t blkcnt)
>> +{
>> + struct mmc_cmd cmd;
>> + ulong end;
>> + int err, start_cmd, end_cmd;
>> +
>> + if (mmc->high_capacity) {
>> + end = start + blkcnt - 1;
>> + } else {
>> + end = (start + blkcnt - 1) * mmc->write_bl_len;
>> + start *= mmc->write_bl_len;
>> + }
>> +
>> + if (IS_SD(mmc)) {
>> + start_cmd = SD_CMD_ERASE_WR_BLK_START;
>> + end_cmd = SD_CMD_ERASE_WR_BLK_END;
>> + } else {
>> + start_cmd = MMC_CMD_ERASE_GROUP_START;
>> + end_cmd = MMC_CMD_ERASE_GROUP_END;
>> + }
>> +
>> + cmd.cmdidx = start_cmd;
>> + cmd.cmdarg = start;
>> + cmd.resp_type = MMC_RSP_R1;
>> +
>> + err = mmc_send_cmd(mmc, &cmd, NULL);
>> + if (err)
>> + goto err_out;
>> +
>> + cmd.cmdidx = end_cmd;
>> + cmd.cmdarg = end;
>> +
>> + err = mmc_send_cmd(mmc, &cmd, NULL);
>> + if (err)
>> + goto err_out;
>> +
>> + cmd.cmdidx = MMC_CMD_ERASE;
>> + cmd.cmdarg = SECURE_ERASE;
>> + cmd.resp_type = MMC_RSP_R1b;
>> +
>> + err = mmc_send_cmd(mmc, &cmd, NULL);
>> + if (err)
>> + goto err_out;
>> +
>> + return 0;
>> +
>> +err_out:
>> +#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
>> + puts("mmc erase failed\n");
>> +#endif
>
>
> this conditional compile in of puts/printf for SPL are no longer
> required, I'd prefere to remove them globally in mmc_write.c.
Ah, yes good point, I'll remove that.
>
>>
>> + return err;
>> +}
>
>
> Rest of this patch looks good to me.
>
> Best regards
>
> Andreas Bießmann
Thanks for looking at it!

Paul