[U-Boot] [PATCH v3] OMAP3 MMC: Fix warning dereferencing type-punned pointer
Dirk Behme
dirk.behme at googlemail.com
Sun Sep 27 20:35:18 CEST 2009
Fix warning
dereferencing type-punned pointer will break strict-aliasing rules
Signed-off-by: Dirk Behme <dirk.behme at googlemail.com>
CC: Steve Sakoman <sakoman at gmail.com>
CC: Tom Rix <Tom.Rix at windriver.com>
---
Changes in v3: Move union type definition to architecture mmc.h as proposed
by Tom.
Changes in v2: Union elements mmc_resp_r3 and mmc_resp_r6 are no pointers.
v1 of this patch breaks MMC handling. Please revert v1 in u-boot-ti
http://git.denx.de/?p=u-boot/u-boot-ti.git;a=commit;h=eb19df366587c887a406d1816fa7f7dca07f537d
and use this one. Thanks to Steve Sakoman for reporting this!
Compile and boot tested on BeagleBoard.
drivers/mmc/omap3_mmc.c | 48 +++++++++++++++++----------------------
include/asm-arm/arch-omap3/mmc.h | 7 +++++
2 files changed, 28 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 +235,8 @@ 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;
+ mmc_resp_t mmc_resp;
/* Set to Initialization Clock */
err = mmc_clock_config(CLK_400KHZ, 0);
@@ -247,18 +247,18 @@ 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 +272,24 @@ 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 +318,22 @@ 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 +437,9 @@ 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;
+ mmc_resp_t mmc_resp;
ret_val = mmc_init_setup();
@@ -453,21 +452,16 @@ 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 +485,18 @@ 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;
Index: u-boot-ti/include/asm-arm/arch-omap3/mmc.h
===================================================================
--- u-boot-ti.orig/include/asm-arm/arch-omap3/mmc.h
+++ u-boot-ti/include/asm-arm/arch-omap3/mmc.h
@@ -223,6 +223,13 @@ typedef struct {
unsigned short newpublishedrca;
} mmc_resp_r6;
+typedef union {
+ unsigned int resp[4];
+ mmc_resp_r3 r3;
+ mmc_resp_r6 r6;
+ mmc_csd_reg_t Card_CSD;
+} mmc_resp_t;
+
extern mmc_card_data mmc_dev;
unsigned char mmc_lowlevel_init(void);
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