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

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Date:	Thu, 15 Mar 2012 12:02:38 -0700
From:	Greg KH <greg@...ah.com>
To:	Aneesh V <aneesh@...com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-omap@...r.kernel.org
Subject: Re: [PATCH v2 1/7] misc: ddr: add LPDDR2 data from JESD209-2

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?

> +#ifndef __ASSEMBLY__

Why is this needed?

> +/* 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.

> --- 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?

>  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@...com>
> + *
> + * 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?

thanks,

greg k-h
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