Re: [PATCH v2 1/7] misc: ddr: add LPDDR2 data from JESD209-2

[Aneesh V]

On Friday 16 March 2012 12:32 AM, Greg KH wrote:
> On Thu, Mar 15, 2012 at 11:47:31PM +0530, Aneesh V wrote:
> > add LPDDR2 data from the JEDEC spec JESD209-2. The data
> > includes:
> >
> > 1. Addressing information for LPDDR2 memories of different
> >     densities and types(S2/S4)
> > 2. AC timing data.
> >
> > This data will useful for memory controller device drivers
>
> Right now, only one driver, right?

Yes, should that be documented?

> > +#ifndef __ASSEMBLY__
>
> Why is this needed?

IIRC, this header file was getting included in an omap specific header
file that was in turn included from an assembly file. I will check if
this is still the case. If not, I will remove it.

> > +/* Structure for DDR addressing info from the JEDEC spec */
> > +struct lpddr2_addressing {
> > +	u32 num_banks;
> > +	u32 tREFI_ns;
> > +	u32 tRFCab_ps;
> > +};
>
> Do these structures cross the user/kernel boundry somehow?  If so,
> please use the proper kernel types for this.

No. These structures are meant for use by device drivers.

> > --- a/lib/Makefile
> > +++ b/lib/Makefile
> > @@ -123,6 +123,9 @@ obj-$(CONFIG_SIGNATURE) += digsig.o
> >
> >   obj-$(CONFIG_CLZ_TAB) += clz_tab.o
> >
> > +obj-$(CONFIG_DDR) += jedec_ddr_data.o
> > +
> > +
>
> Why the extra line?

Un-intentional. Will remove.

> >   hostprogs-y	:= gen_crc32table
> >   clean-files	:= crc32table.h
> >
> > diff --git a/lib/jedec_ddr_data.c b/lib/jedec_ddr_data.c
> > new file mode 100644
> > index 0000000..fc223d6
> > --- /dev/null
> > +++ b/lib/jedec_ddr_data.c
> > @@ -0,0 +1,135 @@
> > +/*
> > + * DDR addressing details and AC timing parameters from JEDEC specs
> > + *
> > + * Copyright (C) 2012 Texas Instruments, Inc.
> > + *
> > + * Aneesh V<aneesh@xxxxxx>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + */
> > +
> > +#include<misc/jedec_ddr.h>
> > +#include<linux/module.h>
> > +
> > +/* LPDDR2 addressing details from JESD209-2 section 2.4 */
> > +const struct lpddr2_addressing
> > +	lpddr2_jedec_addressing_table[NUM_DDR_ADDR_TABLE_ENTRIES] = {
> > +	{B4, T_REFI_15_6, T_RFC_90}, /* 64M */
> > +	{B4, T_REFI_15_6, T_RFC_90}, /* 128M */
> > +	{B4, T_REFI_7_8,  T_RFC_90}, /* 256M */
> > +	{B4, T_REFI_7_8,  T_RFC_90}, /* 512M */
> > +	{B8, T_REFI_7_8, T_RFC_130}, /* 1GS4 */
> > +	{B8, T_REFI_3_9, T_RFC_130}, /* 2GS4 */
> > +	{B8, T_REFI_3_9, T_RFC_130}, /* 4G */
> > +	{B8, T_REFI_3_9, T_RFC_210}, /* 8G */
> > +	{B4, T_REFI_7_8, T_RFC_130}, /* 1GS2 */
> > +	{B4, T_REFI_3_9, T_RFC_130}, /* 2GS2 */
> > +};
> > +EXPORT_SYMBOL(lpddr2_jedec_addressing_table);
>
> EXPORT_SYMBOL_GPL for these and the others?

Will fix all.

Thanks,
Aneesh
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