[U-Boot] [PATCH] arm: socfpga: stratix10: Add generic FPGA reconfig mailbox API for S10

[Ang, Chee Hong <chee.hong.ang@intel.com>]

On Wed, 2018-09-26 at 16:53 +0200, Marek Vasut wrote:
> On 09/26/2018 11:03 AM, chee.hong.ang at intel.com wrote:
> > 
> > From: "Ang, Chee Hong" <chee.hong.ang@intel.com>
> > 
> > Add a generic mailbox API for FPGA reconfig status which can be
> > called by others. This new function accepts 2 different mailbox
> > commands: CONFIG_STATUS or RECONFIG_STATUS.
> What "others" can call this ?
This is a common function used to check the readiness of the FPGA.
FPGA configuration drivers will need to call this to make sure
the FPGA configuration is successfully completed and running.
These FPGA configuration drivers will be submitted soon after this
patch.
> 
> > 
> > Signed-off-by: Ang, Chee Hong <chee.hong.ang@intel.com>
> > ---
> >  arch/arm/mach-socfpga/include/mach/mailbox_s10.h |  3 +-
> >  arch/arm/mach-socfpga/mailbox_s10.c              | 48
> > ++++++++++++++++++++++++
> >  2 files changed, 50 insertions(+), 1 deletion(-)
> > 
> > diff --git a/arch/arm/mach-socfpga/include/mach/mailbox_s10.h
> > b/arch/arm/mach-socfpga/include/mach/mailbox_s10.h
> > index 81a609d..660df35 100644
> > --- a/arch/arm/mach-socfpga/include/mach/mailbox_s10.h
> > +++ b/arch/arm/mach-socfpga/include/mach/mailbox_s10.h
> > @@ -140,5 +140,6 @@ int mbox_qspi_open(void);
> >  #endif
> >  
> >  int mbox_reset_cold(void);
> > -
> > +int mbox_get_fpga_config_status(u32 cmd);
> > +int mbox_get_fpga_config_status_psci(u32 cmd);
> >  #endif /* _MAILBOX_S10_H_ */
> > diff --git a/arch/arm/mach-socfpga/mailbox_s10.c b/arch/arm/mach-
> > socfpga/mailbox_s10.c
> > index 0d906c3..345485c 100644
> > --- a/arch/arm/mach-socfpga/mailbox_s10.c
> > +++ b/arch/arm/mach-socfpga/mailbox_s10.c
> > @@ -342,6 +342,54 @@ int mbox_reset_cold(void)
> >  	return 0;
> >  }
> >  
> > +/* Accepted commands: CONFIG_STATUS or RECONFIG_STATUS */
> > +static __always_inline int mbox_get_fpga_config_status_common(u32
> > cmd)
> Why __always_inline ?
This function is needed in 2 sections. Our u-boot run in normal code
section and '__secure' section which mainly used for PSCI services.
Refer to the 'mbox_get_fpga_config_status()' and
'mbox_get_fpga_config_status_psci()' below. These 2 functions run in 2
different sections and they need to call this function.
> 
> > 
> > +{
> > +	u32 reconfig_status_resp_len;
> > +	u32 reconfig_status_resp[RECONFIG_STATUS_RESPONSE_LEN];
> > +	int ret;
> > +
> > +	reconfig_status_resp_len = RECONFIG_STATUS_RESPONSE_LEN;
> > +	ret = mbox_send_cmd_common(MBOX_ID_UBOOT, cmd,
> > +				   MBOX_CMD_DIRECT, 0, NULL, 0,
> > +				   &reconfig_status_resp_len,
> > +				   reconfig_status_resp);
> > +	if (!ret) {
> if (ret)
>  return ret;
Will be addressed in v2 patch.
> 
> ...
> 
> > 
> > +		/* Check for any error */
> > +		ret = reconfig_status_resp[RECONFIG_STATUS_STATE];
> > +		if (ret && ret != MBOX_CFGSTAT_STATE_CONFIG)
> > +			return ret;
> > +
> > +		/* Make sure nStatus is not 0 */
> > +		ret =
> > reconfig_status_resp[RECONFIG_STATUS_PIN_STATUS];
> > +		if (!(ret & RCF_PIN_STATUS_NSTATUS))
> > +			return MBOX_CFGSTAT_STATE_ERROR_HARDWARE;
> > +
> > +		ret =
> > reconfig_status_resp[RECONFIG_STATUS_SOFTFUNC_STATUS];
> > +		if (ret & RCF_SOFTFUNC_STATUS_SEU_ERROR)
> > +			return MBOX_CFGSTAT_STATE_ERROR_HARDWARE;
> > +
> > +		if ((ret & RCF_SOFTFUNC_STATUS_CONF_DONE) &&
> > +		    (ret & RCF_SOFTFUNC_STATUS_INIT_DONE) &&
> > +		    !reconfig_status_resp[RECONFIG_STATUS_STATE])
> > +			return 0;	/* configuration success
> > */
> > +		else
> > +			return MBOX_CFGSTAT_STATE_CONFIG;
> > +	}
> > +
> > +	return ret;
> > +}
> > +
> > +int mbox_get_fpga_config_status(u32 cmd)
> > +{
> > +	return mbox_get_fpga_config_status_common(cmd);
> > +}
> > +
> > +int __secure mbox_get_fpga_config_status_psci(u32 cmd)
> > +{
> > +	return mbox_get_fpga_config_status_common(cmd);
> > +}
> > +
> >  int mbox_send_cmd(u8 id, u32 cmd, u8 is_indirect, u32 len, u32
> > *arg,
> >  		  u8 urgent, u32 *resp_buf_len, u32 *resp_buf)
> >  {
> > 
>