[U-Boot] [PATCH V2 1/3] mmc: fsl: reset to normal boot mode when eMMC fast boot

[Peng Fan <van.freenix@gmail.com>]

On Fri, Jun 24, 2016 at 03:21:35PM +0000, york sun wrote:
>On 06/24/2016 02:39 AM, Peng Fan wrote:
>> Hi York, Stefano
>>
>> Any comments on this patch set? Would you kindly pick up this patch set?
>
>Technically Panto is the maintainer of MMC. Since this set is dealing 
>with FSL mmc controller, I will pick it up if Panto doesn't mind.

Please do.

Thanks,
Peng.

>
>York
>
>
>>
>> Thanks,
>> Peng.
>> On Wed, Jun 15, 2016 at 10:53:00AM +0800, Peng Fan wrote:
>>> When booting in eMMC fast boot, MMC host does not exit from
>>> boot mode after bootrom loading image. So the first command
>>> 'CMD0' sent in uboot will pull down the CMD line to low and
>>> cause errors.
>>>
>>> This patch cleans the MMC boot register in "mmc_init" to put the
>>> MMC host back to normal mode.
>>>
>>> Also clear DLL_CTRL delay line settings at USDHC initialization
>>> to eliminate the pre-settings from boot rom.
>>>
>>> Signed-off-by: Peng Fan <van.freenix@gmail.com>
>>> Cc: Pantelis Antoniou <panto@antoniou-consulting.com>
>>> Cc: York Sun <york.sun@nxp.com>
>>> Cc: Stefano Babic <sbabic@denx.de>
>>> Cc: Fabio Estevam <fabio.estevam@nxp.com>
>>> ---
>>>
>>> V2:
>>> Rebased to lastest u-boot master
>>>
>>> drivers/mmc/fsl_esdhc.c | 38 +++++++++++++++++++++++++++++---------
>>> include/fsl_esdhc.h     |  6 ++++++
>>> 2 files changed, 35 insertions(+), 9 deletions(-)
>>>
>>> diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
>>> index 57ad975..9cd582f 100644
>>> --- a/drivers/mmc/fsl_esdhc.c
>>> +++ b/drivers/mmc/fsl_esdhc.c
>>> @@ -56,21 +56,27 @@ struct fsl_esdhc {
>>> 	uint    fevt;		/* Force event register */
>>> 	uint    admaes;		/* ADMA error status register */
>>> 	uint    adsaddr;	/* ADMA system address register */
>>> -	char    reserved2[100];	/* reserved */
>>> -	uint    vendorspec;	/* Vendor Specific register */
>>> -	char    reserved3[56];	/* reserved */
>>> +	char    reserved2[4];
>>> +	uint    dllctrl;
>>> +	uint    dllstat;
>>> +	uint    clktunectrlstatus;
>>> +	char    reserved3[84];
>>> +	uint    vendorspec;
>>> +	uint    mmcboot;
>>> +	uint    vendorspec2;
>>> +	char	reserved4[48];
>>> 	uint    hostver;	/* Host controller version register */
>>> -	char    reserved4[4];	/* reserved */
>>> -	uint    dmaerraddr;	/* DMA error address register */
>>> 	char    reserved5[4];	/* reserved */
>>> -	uint    dmaerrattr;	/* DMA error attribute register */
>>> +	uint    dmaerraddr;	/* DMA error address register */
>>> 	char    reserved6[4];	/* reserved */
>>> +	uint    dmaerrattr;	/* DMA error attribute register */
>>> +	char    reserved7[4];	/* reserved */
>>> 	uint    hostcapblt2;	/* Host controller capabilities register 2 */
>>> -	char    reserved7[8];	/* reserved */
>>> +	char    reserved8[8];	/* reserved */
>>> 	uint    tcr;		/* Tuning control register */
>>> -	char    reserved8[28];	/* reserved */
>>> +	char    reserved9[28];	/* reserved */
>>> 	uint    sddirctl;	/* SD direction control register */
>>> -	char    reserved9[712];	/* reserved */
>>> +	char    reserved10[712];/* reserved */
>>> 	uint    scr;		/* eSDHC control register */
>>> };
>>>
>>> @@ -616,6 +622,20 @@ static int esdhc_init(struct mmc *mmc)
>>> 	while ((esdhc_read32(&regs->sysctl) & SYSCTL_RSTA) && --timeout)
>>> 		udelay(1000);
>>>
>>> +#if defined(CONFIG_FSL_USDHC)
>>> +	/* RSTA doesn't reset MMC_BOOT register, so manually reset it */
>>> +	esdhc_write32(&regs->mmcboot, 0x0);
>>> +	/* Reset MIX_CTRL and CLK_TUNE_CTRL_STATUS regs to 0 */
>>> +	esdhc_write32(&regs->mixctrl, 0x0);
>>> +	esdhc_write32(&regs->clktunectrlstatus, 0x0);
>>> +
>>> +	/* Put VEND_SPEC to default value */
>>> +	esdhc_write32(&regs->vendorspec, VENDORSPEC_INIT);
>>> +
>>> +	/* Disable DLL_CTRL delay line */
>>> +	esdhc_write32(&regs->dllctrl, 0x0);
>>> +#endif
>>> +
>>> #ifndef ARCH_MXC
>>> 	/* Enable cache snooping */
>>> 	esdhc_write32(&regs->scr, 0x00000040);
>>> diff --git a/include/fsl_esdhc.h b/include/fsl_esdhc.h
>>> index fa760a5..78c67c8 100644
>>> --- a/include/fsl_esdhc.h
>>> +++ b/include/fsl_esdhc.h
>>> @@ -35,6 +35,12 @@
>>> #define SYSCTL_RSTC		0x02000000
>>> #define SYSCTL_RSTD		0x04000000
>>>
>>> +#define VENDORSPEC_CKEN		0x00004000
>>> +#define VENDORSPEC_PEREN	0x00002000
>>> +#define VENDORSPEC_HCKEN	0x00001000
>>> +#define VENDORSPEC_IPGEN	0x00000800
>>> +#define VENDORSPEC_INIT		0x20007809
>>> +
>>> #define IRQSTAT			0x0002e030
>>> #define IRQSTAT_DMAE		(0x10000000)
>>> #define IRQSTAT_AC12E		(0x01000000)
>>> --
>>> 2.6.2
>>>
>>
>