[U-Boot] [PATCH v8 6/8] spl : socfpga: Implement fpga bitstream loading with socfpga loadfs

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

On Thu, 2019-02-14 at 11:42 +0100, Marek Vasut wrote:
> On 2/14/19 7:50 AM, Chee, Tien Fong wrote:
> > 
> > On Wed, 2019-02-13 at 17:25 +0100, Marek Vasut wrote:
> > > 
> > > On 2/13/19 3:18 PM, 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>
> > > > 
> > > > ---
> > > > 
> > > > changes for v7
> > > > - Removed casting for get_fpga_filename
> > > > - Removed hard coding DDR address for loading core bistream,
> > > > using
> > > > loadable
> > > >   property from FIT.
> > > > - Added checking for config_pins, return if error.
> > > > ---
> > > >  arch/arm/mach-socfpga/spl_a10.c | 41
> > > > ++++++++++++++++++++++++++++++++++++++++-
> > > >  1 file changed, 40 insertions(+), 1 deletion(-)
> > > > 
> > > > diff --git a/arch/arm/mach-socfpga/spl_a10.c b/arch/arm/mach-
> > > > socfpga/spl_a10.c
> > > > index c97eacb..36003b1 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) 2012-2019 Altera Corporation <www.altera.com
> > > > >
> > > >   */
> > > >  
> > > >  #include <common.h>
> > > > @@ -23,6 +23,8 @@
> > > >  #include <fdtdec.h>
> > > >  #include <watchdog.h>
> > > >  #include <asm/arch/pinmux.h>
> > > > +#include <asm/arch/fpga_manager.h>
> > > > +#include <mmc.h>
> > > >  
> > > >  DECLARE_GLOBAL_DATA_PTR;
> > > >  
> > > > @@ -68,11 +70,48 @@ u32 spl_boot_mode(const u32 boot_device)
> > > >  
> > > >  void spl_board_init(void)
> > > >  {
> > > > +	char buf[16 * 1024] __aligned(ARCH_DMA_MINALIGN);
> > > ALLOC_CACHE_ALIGN_BUFFER()
> > #define ARCH_DMA_MINALIGN	CONFIG_SYS_CACHELINE_SIZE
> > They are not same thing?
> See include/memalign.h and other drivers, the macro is preferred as
> it
> hides the details.
Okay.
> 
> > 
> > > 
> > > > 
> > > > 
> > > > +
> > > >  	/* enable console uart printing */
> > > >  	preloader_console_init();
> > > >  	WATCHDOG_RESET();
> > > >  
> > > >  	arch_early_init_r();
> > > > +
> > > > +	/* If the full FPGA is already loaded, ie.from EPCQ,
> > > > config fpga pins */
> > > > +	if (is_fpgamgr_user_mode()) {
> > > > +		int ret = config_pins(gd->fdt_blob, "shared");
> > > > +
> > > > +		if (ret)
> > > > +			return;
> > > > +
> > > > +		ret = config_pins(gd->fdt_blob, "fpga");
> > > > +		if (ret)
> > > > +			return;
> > > > +	} else if (!is_fpgamgr_early_user_mode()) {
> > > > +		/* Program IOSSM(early IO release) or full
> > > > FPGA */
> > > > +		fpga_fs_info fpga_fsinfo;
> > > > +		int len;
> > > > +
> > > > +		fpga_fsinfo.filename = get_fpga_filename(gd-
> > > > > 
> > > > > fdt_blob, &len);
> > > > +
> > > > +		if (fpga_fsinfo.filename)
> > > > +			socfpga_loadfs(&fpga_fsinfo, buf,
> > > > sizeof(buf), 0);
> > > Why is this code here twice ? The same code seems to be below ...
> > The 1st calling for periph program, then running ddr calibration,
> > then
> > 2nd calling for core program.
> Then maybe the code can be deduplicated ?
Hmm...seems cannot, because
1. DDR calibration is not part of fpga code.
2. fpga driver can only be used to process one bistream at a time,
because different mode has different handling.
> 
> > 
> > > 
> > > > 
> > > > +	}
> > > > +
> > > > +	/* If the IOSSM/full FPGA is already loaded, start DDR
> > > > */
> > > > +	if (is_fpgamgr_early_user_mode() ||
> > > > is_fpgamgr_user_mode())
> > > > +		ddr_calibration_sequence();
> > > > +
> > > > +	if (!is_fpgamgr_user_mode()) {
> > > > +		fpga_fs_info fpga_fsinfo;
> > > > +		int len;
> > > > +
> > > > +		fpga_fsinfo.filename = get_fpga_filename(gd-
> > > > > 
> > > > > fdt_blob, &len);
> > > > +
> > > > +		if (fpga_fsinfo.filename)
> > > > +			socfpga_loadfs(&fpga_fsinfo, buf,
> > > > sizeof(buf), 0);
> > > > +	}
> > > >  }
> > > >  
> > > >  void board_init_f(ulong dummy)
> > > > 
>