[U-Boot] [PATCH 6/7] arm: socfpga: Add Arria10 FPGA manager program assembly driver

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

On Jum, 2017-05-05 at 13:14 +0200, Marek Vasut wrote:
> On 05/05/2017 12:26 PM, tien.fong.chee at intel.com wrote:
> > 
> > From: Tien Fong Chee <tien.fong.chee@intel.com>
> > 
> > Adding the Arria10 FPGA manager program assembly driver which can
> > be used
> > to feed bitstream into FPGA manager for configuring FPGA.
> > 
> > Signed-off-by: Tien Fong Chee <tien.fong.chee@intel.com>
> > ---
> >  arch/arm/mach-socfpga/Makefile        |    1 +
> >  arch/arm/mach-socfpga/lowlevel_init.S |   48
> > +++++++++++++++++++++++++++++++++
> >  2 files changed, 49 insertions(+), 0 deletions(-)
> >  create mode 100644 arch/arm/mach-socfpga/lowlevel_init.S
> > 
> > diff --git a/arch/arm/mach-socfpga/Makefile b/arch/arm/mach-
> > socfpga/Makefile
> > index 824cd8e..8b86dc7 100644
> > --- a/arch/arm/mach-socfpga/Makefile
> > +++ b/arch/arm/mach-socfpga/Makefile
> > @@ -24,6 +24,7 @@ endif
> >  
> >  ifdef CONFIG_TARGET_SOCFPGA_ARRIA10
> >  obj-y	+= clock_manager_arria10.o
> > +obj-y	+= lowlevel_init.o
> >  obj-y	+= misc_arria10.o
> >  obj-y	+= pinmux_arria10.o
> >  obj-y	+= reset_manager_arria10.o
> > diff --git a/arch/arm/mach-socfpga/lowlevel_init.S b/arch/arm/mach-
> > socfpga/lowlevel_init.S
> > new file mode 100644
> > index 0000000..79e9d07
> > --- /dev/null
> > +++ b/arch/arm/mach-socfpga/lowlevel_init.S
> > @@ -0,0 +1,48 @@
> > +/*
> > + * Copyright (C) 2017 Intel Corporation <www.intel.com>
> > + *
> > + * SPDX-License-Identifier:    GPL-2.0
> > + */
> > +
> > +#include <asm-offsets.h>
> > +#include <config.h>
> > +#include <linux/linkage.h>
> > +
> > +/*
> > + * Write RBF data in burst form to FPGA Manager
> > + * [r0] RBF binary source address
> > + * [r1] FPGA Manager data address
> > + * [r2] RBF data length
> > + */
> We do the same for Gen5 in C code with a bit of assembly, so do the
> same.
> 
Okay, i just saw it, thanks for pointing out.
> > 
> > +ENTRY(fpgamgr_axi_write)
> > +	PUSH    {r4-r11, lr}            /* save registers per
> > AAPCS */
> > +
> > +write_burst:
> > +	cmp     r2,#32
> > +	beq     write_burst_cont
> > +	bls     write_word
> > +write_burst_cont:
> > +	ldmia   r0!, {r4-r11}
> > +	stmia   r1, {r4-r11}
> > +	subs    r2, r2, #32
> > +	b       write_burst
> > +
> > +write_word:
> > +	cmp     r2,#4
> > +	beq     write_word_cont
> > +	bls     write_byte
> > +write_word_cont:
> > +	ldmia   r0!, {r4}
> > +	stmia   r1, {r4}
> > +	subs    r2, r2, #4
> > +	b       write_word
> > +
> > +write_byte:
> > +	cmp     r2,#0
> > +	beq     write_end
> > +	ldr     r3, [r0]
> > +	str     r3, [r1]
> > +write_end:
> > +	POP     {r4-r11, pc}
> > +ENDPROC(fpgamgr_axi_write)
> > 
>