[U-Boot] [PATCH v4 10/14] OMAP3 SPL: Add identify_nand_chip function

[Igor Grinberg]

Hi Tom,

On 11/19/11 00:48, Tom Rini wrote:
> A number of boards are populated with a PoP chip for both DDR and NAND
> memory.  Other boards may simply use this as an easy way to identify
> board revs.  So we provide a function that can be called early to reset
> the NAND chip and return the result of NAND_CMD_READID.  All of this
> code is put into spl_id_nand.c and controlled via CONFIG_SPL_OMAP3_ID_NAND.
> 
> Signed-off-by: Tom Rini <trini at ti.com>
> ---
>  arch/arm/cpu/armv7/omap3/Makefile           |    3 +
>  arch/arm/cpu/armv7/omap3/spl_id_nand.c      |   87 +++++++++++++++++++++++++++
>  arch/arm/include/asm/arch-omap3/sys_proto.h |    1 +
>  3 files changed, 91 insertions(+), 0 deletions(-)
>  create mode 100644 arch/arm/cpu/armv7/omap3/spl_id_nand.c
> 
> diff --git a/arch/arm/cpu/armv7/omap3/Makefile b/arch/arm/cpu/armv7/omap3/Makefile
> index 8e85891..4b38e45 100644
> --- a/arch/arm/cpu/armv7/omap3/Makefile
> +++ b/arch/arm/cpu/armv7/omap3/Makefile
> @@ -31,6 +31,9 @@ COBJS	+= board.o
>  COBJS	+= clock.o
>  COBJS	+= mem.o
>  COBJS	+= sys_info.o
> +ifdef CONFIG_SPL_BUILD
> +COBJS-$(CONFIG_SPL_OMAP3_ID_NAND)	+= spl_id_nand.o
> +endif

You haven't responded to my question on the above stuff.
Otherwise all the series look good to me.

Original version available at:
http://www.mail-archive.com/u-boot@lists.denx.de/msg68828.html

Here is the relevant part:

>>> diff --git a/arch/arm/cpu/armv7/omap3/Makefile b/arch/arm/cpu/armv7/omap3/Makefile
>>> >>> index 8e85891..772f3d4 100644
>>> >>> --- a/arch/arm/cpu/armv7/omap3/Makefile
>>> >>> +++ b/arch/arm/cpu/armv7/omap3/Makefile
>>> >>> @@ -31,6 +31,9 @@ COBJS	+= board.o
>>> >>>  COBJS	+= clock.o
>>> >>>  COBJS	+= mem.o
>>> >>>  COBJS	+= sys_info.o
>>> >>> +ifdef CONFIG_SPL_BUILD
>>> >>> +COBJS-$(CONFIG_SPL_OMAP3_POP_PROBE)	+= spl_pop_probe.o
>>> >>> +endif
>> >>
>> >> Can't CONFIG_SPL_OMAP3_..._PROBE symbol default to "no"
>> >> and depend on CONFIG_SPL_BUILD, so you don't need to enclose
>> >> it in #ifdef?
> > 
> > But then it would build for both SPL and non-SPL cases.

No, it should not.
What do you think of the following:
In the Makefile have only:
COBJS-$(CONFIG_SPL_OMAP3_POP_PROBE)	+= spl_pop_probe.o

Then in the spl_pop_probe.c have this type of check:
#ifndef CONFIG_SPL_BUILD
# error CONFIG_SPL_OMAP3_POP_PROBE requires CONFIG_SPL_BUILD
#endif

This way, you require the CONFIG_SPL_OMAP3_POP_PROBE symbol
be a part of the CONFIG_SPL_BUILD symbols group.


>  
>  COBJS-$(CONFIG_EMIF4)	+= emif4.o
>  COBJS-$(CONFIG_SDRC)	+= sdrc.o
> diff --git a/arch/arm/cpu/armv7/omap3/spl_id_nand.c b/arch/arm/cpu/armv7/omap3/spl_id_nand.c
> new file mode 100644
> index 0000000..0871fc9
> --- /dev/null
> +++ b/arch/arm/cpu/armv7/omap3/spl_id_nand.c
> @@ -0,0 +1,87 @@
> +/*
> + * (C) Copyright 2011
> + * Texas Instruments, <www.ti.com>
> + *
> + * Author :
> + *     Tom Rini <trini at ti.com>
> + *
> + * Initial Code from:
> + *     Richard Woodruff <r-woodruff2 at ti.com>
> + *     Jian Zhang <jzhang at ti.com>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of
> + * the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
> + * MA 02111-1307 USA
> + */
> +
> +#include <common.h>
> +#include <linux/mtd/nand.h>
> +#include <asm/io.h>
> +#include <asm/arch/sys_proto.h>
> +#include <asm/arch/mem.h>
> +
> +static struct gpmc *gpmc_config = (struct gpmc *)GPMC_BASE;
> +
> +/* nand_command: Send a flash command to the flash chip */
> +static void nand_command(u8 command)
> +{
> +	writeb(command, &gpmc_config->cs[0].nand_cmd);
> +
> +	if (command == NAND_CMD_RESET) {
> +		unsigned char ret_val;
> +		writeb(NAND_CMD_STATUS, &gpmc_config->cs[0].nand_cmd);
> +		do {
> +			/* Wait until ready */
> +			ret_val = readl(&gpmc_config->cs[0].nand_dat);
> +		} while ((ret_val & NAND_STATUS_READY) != NAND_STATUS_READY);
> +	}
> +}
> +
> +/*
> + * Many boards will want to know the results of the NAND_CMD_READID command
> + * in order to decide what to do about DDR initialization.  This function
> + * allows us to do that very early and to pass those results back to the
> + * board so it can make whatever decisions need to be made.
> + */
> +void identify_nand_chip(int *mfr, int *id)
> +{
> +	/* Make sure that we have setup GPMC for NAND correctly. */
> +	writel(M_NAND_GPMC_CONFIG1, &gpmc_config->cs[0].config1);
> +	writel(M_NAND_GPMC_CONFIG2, &gpmc_config->cs[0].config2);
> +	writel(M_NAND_GPMC_CONFIG3, &gpmc_config->cs[0].config3);
> +	writel(M_NAND_GPMC_CONFIG4, &gpmc_config->cs[0].config4);
> +	writel(M_NAND_GPMC_CONFIG5, &gpmc_config->cs[0].config5);
> +	writel(M_NAND_GPMC_CONFIG6, &gpmc_config->cs[0].config6);
> +
> +	/*
> +	 * Enable the config.  The CS size goes in bits 11:8.  We set
> +	 * bit 6 to enable the CS and the base address goes into bits 5:0.
> +	 */
> +	writel((GPMC_SIZE_128M << 8) | (GPMC_CS_ENABLE << 6) |
> +				((NAND_BASE >> 24) & GPMC_BASEADDR_MASK),
> +			&gpmc_config->cs[0].config7);
> +
> +	sdelay(2000);
> +
> +	/* Issue a RESET and then READID */
> +	nand_command(NAND_CMD_RESET);
> +	nand_command(NAND_CMD_READID);
> +
> +	/* Set the address to read to 0x0 */
> +	writeb(0x0, &gpmc_config->cs[0].nand_adr);
> +
> +	/* Read off the manufacturer and device id. */
> +	*mfr = readb(&gpmc_config->cs[0].nand_dat);
> +	*id = readb(&gpmc_config->cs[0].nand_dat);
> +}
> diff --git a/arch/arm/include/asm/arch-omap3/sys_proto.h b/arch/arm/include/asm/arch-omap3/sys_proto.h
> index 80e167b..e5031d5 100644
> --- a/arch/arm/include/asm/arch-omap3/sys_proto.h
> +++ b/arch/arm/include/asm/arch-omap3/sys_proto.h
> @@ -40,6 +40,7 @@ void sdrc_init(void);
>  void do_sdrc_init(u32, u32);
>  void get_board_mem_timings(u32 *mcfg, u32 *ctrla, u32 *ctrlb, u32 *rfr_ctrl,
>  		u32 *mr);
> +void identify_nand_chip(int *mfr, int *id);
>  void emif4_init(void);
>  void gpmc_init(void);
>  void enable_gpmc_cs_config(const u32 *gpmc_config, struct gpmc_cs *cs, u32 base,

-- 
Regards,
Igor.