[U-Boot] [PATCH] OMAP3 MMC: Fix warning dereferencing type-punned pointer
Paulraj, Sandeep
s-paulraj at ti.com
Tue Sep 15 00:29:10 CEST 2009
> -----Original Message-----
> From: u-boot-bounces at lists.denx.de [mailto:u-boot-bounces at lists.denx.de]
> On Behalf Of Dirk Behme
> Sent: Sunday, September 13, 2009 4:40 AM
> To: u-boot at lists.denx.de
> Subject: [U-Boot] [PATCH] OMAP3 MMC: Fix warning dereferencing type-punned
> pointer
>
> Fix warning
>
> dereferencing type-punned pointer will break strict-aliasing rules
>
> Signed-off-by: Dirk Behme <dirk.behme at googlemail.com>
>
> ---
If nobody has any issues with this patch I would like to push this to u-boot-ti as the u-boot-mmc fork seems not synced up with the latest U-Boot GIT tree.
>
> Patch against recent u-boot-ti git
> f4f92c81835ccc43f74925737dfd478edb0182f2
> "TI: OMAP3: Overo Tobi ethernet support"
>
> Compile tested only ./MAKEALL ARM_CORTEX_A8
>
> drivers/mmc/omap3_mmc.c | 56 ++++++++++++++++++++++++------------------
> ------
> 1 file changed, 29 insertions(+), 27 deletions(-)
>
> Index: u-boot-ti/drivers/mmc/omap3_mmc.c
> ===================================================================
> --- u-boot-ti.orig/drivers/mmc/omap3_mmc.c
> +++ u-boot-ti/drivers/mmc/omap3_mmc.c
> @@ -235,8 +235,13 @@ unsigned char mmc_detect_card(mmc_card_d
> unsigned char err;
> unsigned int argument = 0;
> unsigned int ocr_value, ocr_recvd, ret_cmd41, hcs_val;
> - unsigned int resp[4];
> unsigned short retry_cnt = 2000;
> + union {
> + unsigned int resp[4];
> + mmc_resp_r3 *r3;
> + mmc_resp_r6 *r6;
> + } mmc_resp;
> +
>
> /* Set to Initialization Clock */
> err = mmc_clock_config(CLK_400KHZ, 0);
> @@ -247,18 +252,18 @@ unsigned char mmc_detect_card(mmc_card_d
> argument = 0x00000000;
>
> ocr_value = (0x1FF << 15);
> - err = mmc_send_cmd(MMC_CMD0, argument, resp);
> + err = mmc_send_cmd(MMC_CMD0, argument, mmc_resp.resp);
> if (err != 1)
> return err;
>
> argument = SD_CMD8_CHECK_PATTERN | SD_CMD8_2_7_3_6_V_RANGE;
> - err = mmc_send_cmd(MMC_SDCMD8, argument, resp);
> + err = mmc_send_cmd(MMC_SDCMD8, argument, mmc_resp.resp);
> hcs_val = (err == 1) ?
> MMC_OCR_REG_HOST_CAPACITY_SUPPORT_SECTOR :
> MMC_OCR_REG_HOST_CAPACITY_SUPPORT_BYTE;
>
> argument = 0x0000 << 16;
> - err = mmc_send_cmd(MMC_CMD55, argument, resp);
> + err = mmc_send_cmd(MMC_CMD55, argument, mmc_resp.resp);
> if (err == 1) {
> mmc_card_cur->card_type = SD_CARD;
> ocr_value |= hcs_val;
> @@ -272,24 +277,24 @@ unsigned char mmc_detect_card(mmc_card_d
> }
>
> argument = ocr_value;
> - err = mmc_send_cmd(ret_cmd41, argument, resp);
> + err = mmc_send_cmd(ret_cmd41, argument, mmc_resp.resp);
> if (err != 1)
> return err;
>
> - ocr_recvd = ((mmc_resp_r3 *) resp)->ocr;
> + ocr_recvd = mmc_resp.r3->ocr;
>
> while (!(ocr_recvd & (0x1 << 31)) && (retry_cnt > 0)) {
> retry_cnt--;
> if (mmc_card_cur->card_type == SD_CARD) {
> argument = 0x0000 << 16;
> - err = mmc_send_cmd(MMC_CMD55, argument, resp);
> + err = mmc_send_cmd(MMC_CMD55, argument, mmc_resp.resp);
> }
>
> argument = ocr_value;
> - err = mmc_send_cmd(ret_cmd41, argument, resp);
> + err = mmc_send_cmd(ret_cmd41, argument, mmc_resp.resp);
> if (err != 1)
> return err;
> - ocr_recvd = ((mmc_resp_r3 *) resp)->ocr;
> + ocr_recvd = mmc_resp.r3->ocr;
> }
>
> if (!(ocr_recvd & (0x1 << 31)))
> @@ -318,22 +323,22 @@ unsigned char mmc_detect_card(mmc_card_d
> if (!(ocr_recvd & ocr_value))
> return 0;
>
> - err = mmc_send_cmd(MMC_CMD2, argument, resp);
> + err = mmc_send_cmd(MMC_CMD2, argument, mmc_resp.resp);
> if (err != 1)
> return err;
>
> if (mmc_card_cur->card_type == MMC_CARD) {
> argument = mmc_card_cur->RCA << 16;
> - err = mmc_send_cmd(MMC_CMD3, argument, resp);
> + err = mmc_send_cmd(MMC_CMD3, argument, mmc_resp.resp);
> if (err != 1)
> return err;
> } else {
> argument = 0x00000000;
> - err = mmc_send_cmd(MMC_SDCMD3, argument, resp);
> + err = mmc_send_cmd(MMC_SDCMD3, argument, mmc_resp.resp);
> if (err != 1)
> return err;
>
> - mmc_card_cur->RCA = ((mmc_resp_r6 *) resp)->newpublishedrca;
> + mmc_card_cur->RCA = mmc_resp.r6->newpublishedrca;
> }
>
> writel(readl(&mmc_base->con) & ~OD, &mmc_base->con);
> @@ -437,10 +442,12 @@ unsigned char configure_mmc(mmc_card_dat
> {
> unsigned char ret_val;
> unsigned int argument;
> - unsigned int resp[4];
> unsigned int trans_clk, trans_fact, trans_unit, retries = 2;
> - mmc_csd_reg_t Card_CSD;
> unsigned char trans_speed;
> + union {
> + unsigned int resp[4];
> + mmc_csd_reg_t Card_CSD;
> + } mmc_resp;
>
> ret_val = mmc_init_setup();
>
> @@ -453,21 +460,16 @@ unsigned char configure_mmc(mmc_card_dat
> } while ((retries > 0) && (ret_val != 1));
>
> argument = mmc_card_cur->RCA << 16;
> - ret_val = mmc_send_cmd(MMC_CMD9, argument, resp);
> + ret_val = mmc_send_cmd(MMC_CMD9, argument, mmc_resp.resp);
> if (ret_val != 1)
> return ret_val;
>
> - ((unsigned int *) &Card_CSD)[3] = resp[3];
> - ((unsigned int *) &Card_CSD)[2] = resp[2];
> - ((unsigned int *) &Card_CSD)[1] = resp[1];
> - ((unsigned int *) &Card_CSD)[0] = resp[0];
> -
> if (mmc_card_cur->card_type == MMC_CARD)
> - mmc_card_cur->version = Card_CSD.spec_vers;
> + mmc_card_cur->version = mmc_resp.Card_CSD.spec_vers;
>
> - trans_speed = Card_CSD.tran_speed;
> + trans_speed = mmc_resp.Card_CSD.tran_speed;
>
> - ret_val = mmc_send_cmd(MMC_CMD4, MMC_DSR_DEFAULT << 16, resp);
> + ret_val = mmc_send_cmd(MMC_CMD4, MMC_DSR_DEFAULT << 16,
> mmc_resp.resp);
> if (ret_val != 1)
> return ret_val;
>
> @@ -491,18 +493,18 @@ unsigned char configure_mmc(mmc_card_dat
> return ret_val;
>
> argument = mmc_card_cur->RCA << 16;
> - ret_val = mmc_send_cmd(MMC_CMD7_SELECT, argument, resp);
> + ret_val = mmc_send_cmd(MMC_CMD7_SELECT, argument, mmc_resp.resp);
> if (ret_val != 1)
> return ret_val;
>
> /* Configure the block length to 512 bytes */
> argument = MMCSD_SECTOR_SIZE;
> - ret_val = mmc_send_cmd(MMC_CMD16, argument, resp);
> + ret_val = mmc_send_cmd(MMC_CMD16, argument, mmc_resp.resp);
> if (ret_val != 1)
> return ret_val;
>
> /* get the card size in sectors */
> - ret_val = mmc_read_cardsize(mmc_card_cur, &Card_CSD);
> + ret_val = mmc_read_cardsize(mmc_card_cur, &mmc_resp.Card_CSD);
> if (ret_val != 1)
> return ret_val;
>
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