[U-Boot] [PATCH 3/9] spl : socfpga: Implement fpga bitstream loading with socfpga loadfs

[Chee, Tien Fong <tien.fong.chee@intel.com>]

On Wed, 2018-11-21 at 15:19 +0100, Marek Vasut wrote:
> On 11/21/2018 11:41 AM, tien.fong.chee at intel.com wrote:
> > 
> > From: Tien Fong Chee <tien.fong.chee@intel.com>
> > 
> > Add support for loading FPGA bitstream to get DDR up running before
> > U-Boot is loaded into DDR. Boot device initialization, generic
> > firmware
> > loader and SPL FAT support are required for this whole mechanism to
> > work.
> > 
> > Signed-off-by: Tien Fong Chee <tien.fong.chee@intel.com>
> > ---
> >  arch/arm/mach-socfpga/spl_a10.c |   49
> > ++++++++++++++++++++++++++++++++++++++-
> >  common/spl/spl_mmc.c            |    2 +-
> >  include/mmc.h                   |    1 +
> >  3 files changed, 50 insertions(+), 2 deletions(-)
> > 
> > diff --git a/arch/arm/mach-socfpga/spl_a10.c b/arch/arm/mach-
> > socfpga/spl_a10.c
> > index 3ea64f7..67a4fac 100644
> > --- a/arch/arm/mach-socfpga/spl_a10.c
> > +++ b/arch/arm/mach-socfpga/spl_a10.c
> > @@ -1,6 +1,6 @@
> >  // SPDX-License-Identifier: GPL-2.0+
> >  /*
> > - *  Copyright (C) 2012 Altera Corporation <www.altera.com>
> > + *  Copyright (C) 2012-2018 Altera Corporation <www.altera.com>
> >   */
> >  
> >  #include <common.h>
> > @@ -23,6 +23,10 @@
> >  #include <fdtdec.h>
> >  #include <watchdog.h>
> >  #include <asm/arch/pinmux.h>
> > +#include <asm/arch/fpga_manager.h>
> > +#include <mmc.h>
> > +
> > +#define RBF	0
> >  
> >  DECLARE_GLOBAL_DATA_PTR;
> >  
> > @@ -73,6 +77,49 @@ void spl_board_init(void)
> >  	WATCHDOG_RESET();
> >  
> >  	arch_early_init_r();
> > +
> > +	/* If the full FPGA is already loaded, ie.from EPCQ,
> > config fpga pins */
> > +	if (is_fpgamgr_user_mode()) {
> > +		config_pins(gd->fdt_blob, "shared");
> > +		config_pins(gd->fdt_blob, "fpga");
> > +	} else if (!is_fpgamgr_early_user_mode()) {
> > +		/* Program IOSSM(early IO release) or full FPGA */
> > +		fpga_fs_info fpga_fsinfo;
> > +		char buf[16 * 1024] __aligned(ARCH_DMA_MINALIGN);
> > +		struct spl_boot_device bootdev;
> > +		int len = 0;
> > +
> > +		bootdev.boot_device = spl_boot_device();
> > +
> > +		/* Init MMC driver before reading FPGA bitstream
> > from flash */
> > +		if (bootdev.boot_device == BOOT_DEVICE_MMC1) {
> > +			struct mmc *mmc = NULL;
> > +			int err = 0;
> > +
> > +			err = spl_mmc_find_device(&mmc,
> > bootdev.boot_device);
> > +			if (err)
> > +				return;
> > +
> > +			err = mmc_init(mmc);
> I thought all this backend specific stuff would be hidden in the FW
> loader.
The backend supported by FW loader is up to generic file system
interface layer. flash driver init is expected done by SPL/U-Boot
common init sequence framwork or user. Unfortunately, fw loader need to
access flash before init sequence.
> 
> > 
> > +			if (err) {
> > +				debug("spl: mmc init failed with
> > error: %d\n",
> > +					err);
> > +
> > +				return;
> > +			}
> > +		}
> > +
> > +		fpga_fsinfo.filename = (char
> > *)get_fpga_filename(gd->fdt_blob,
> > +								 &
> > len,
> > +								 R
> > BF);
> > +
> > +		socfpga_loadfs(&fpga_fsinfo, buf, sizeof(buf), 0);
> > +	}
> > +
> > +	/* If the IOSSM/full FPGA is already loaded, start DDR */
> > +	if (is_fpgamgr_early_user_mode() ||
> > is_fpgamgr_user_mode())
> > +		ddr_calibration_sequence();
> >  }
> >  
> >  void board_init_f(ulong dummy)
> > diff --git a/common/spl/spl_mmc.c b/common/spl/spl_mmc.c
> > index 4d55dcc..b85e146 100644
> > --- a/common/spl/spl_mmc.c
> > +++ b/common/spl/spl_mmc.c
> > @@ -111,7 +111,7 @@ static int spl_mmc_get_device_index(u32
> > boot_device)
> >  	return -ENODEV;
> >  }
> >  
> > -static int spl_mmc_find_device(struct mmc **mmcp, u32 boot_device)
> > +int spl_mmc_find_device(struct mmc **mmcp, u32 boot_device)
> >  {
> >  #if CONFIG_IS_ENABLED(DM_MMC)
> >  	struct udevice *dev;
> > diff --git a/include/mmc.h b/include/mmc.h
> > index 95548e9..de92909 100644
> > --- a/include/mmc.h
> > +++ b/include/mmc.h
> > @@ -829,6 +829,7 @@ int board_mmc_init(bd_t *bis);
> >  int cpu_mmc_init(bd_t *bis);
> >  int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr);
> >  int mmc_get_env_dev(void);
> > +int spl_mmc_find_device(struct mmc **mmcp, u32 boot_device);
> >  
> >  /* Set block count limit because of 16 bit register limit on some
> > hardware*/
> >  #ifndef CONFIG_SYS_MMC_MAX_BLK_COUNT
> > 
>