[U-Boot] [PATCH] armv8: fsl-lsch2: enable snoopable usb read and write

[Stuart Yoder]

> -----Original Message-----
> From: Changming Huang [mailto:jerry.huang at nxp.com]
> Sent: Thursday, December 15, 2016 1:45 AM
> To: york sun <york.sun at nxp.com>; u-boot at lists.denx.de; Stuart Yoder <stuart.yoder at nxp.com>
> Cc: Jerry Huang <jerry.huang at nxp.com>
> Subject: [PATCH] armv8: fsl-lsch2: enable snoopable usb read and write
> 
> By default the USB IP on the ls1012a/ls1043a/ls1046a SoCs does not
> generat coherent/snoopable transactions. Here enable it in the
> SCFG_SNPCNFGCR register.
> In addition, the dma-coherent property must be set in USB DTS nodes.
> 
> Signed-off-by: Changming Huang <jerry.huang at nxp.com>
> ---
>  arch/arm/cpu/armv8/fsl-layerscape/soc.c            |   13 ++++++++++++-
>  .../include/asm/arch-fsl-layerscape/immap_lsch2.h  |    6 ++++++
>  2 files changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/cpu/armv8/fsl-layerscape/soc.c b/arch/arm/cpu/armv8/fsl-layerscape/soc.c
> index 2f54625..74eb8a1 100644
> --- a/arch/arm/cpu/armv8/fsl-layerscape/soc.c
> +++ b/arch/arm/cpu/armv8/fsl-layerscape/soc.c
> @@ -340,6 +340,7 @@ void fsl_lsch2_early_init_f(void)
>  {
>  	struct ccsr_cci400 *cci = (struct ccsr_cci400 *)CONFIG_SYS_CCI400_ADDR;
>  	struct ccsr_scfg *scfg = (struct ccsr_scfg *)CONFIG_SYS_FSL_SCFG_ADDR;
> +	u32 snp_usb;
> 
>  #ifdef CONFIG_LAYERSCAPE_NS_ACCESS
>  	enable_layerscape_ns_access();
> @@ -352,11 +353,21 @@ void fsl_lsch2_early_init_f(void)
>  #if defined(CONFIG_FSL_QSPI) && !defined(CONFIG_QSPI_BOOT)
>  	out_be32(&scfg->qspi_cfg, SCFG_QSPI_CLKSEL);
>  #endif
> +
> +	snp_usb = SCFG_SNPCNFGCR_USB1RDSNP | SCFG_SNPCNFGCR_USB1WRSNP;
> +#if defined(CONFIG_ARCH_LS1043A) || defined(CONFIG_ARCH_LS1046A)
> +	snp_usb |= SCFG_SNPCNFGCR_USB2WRSNP |
> +			SCFG_SNPCNFGCR_USB2RDSNP |
> +			SCFG_SNPCNFGCR_USB3WRSNP |
> +			SCFG_SNPCNFGCR_USB3RDSNP;
> +#endif
> +
>  	/* Make SEC reads and writes snoopable */

Fix the above comment...it is not only about SEC anymore.

Stuart