[PATCH v2] nandsim: add id_bytes module parameter

[Brian Norris]

On Sun, Oct 19, 2014 at 10:04:27PM +0900, Akinobu Mita wrote:
> nandsim can simulate NAND Flash which returns the ID bytes specified
> by first_id_byte, ..., fourth_id_byte module parameters.
> 
> In order to simulate NAND flash which returns more than four ID bytes,
> this adds id_bytes module parameter which is specified by the array of
> byte like this:
> 
>  # modprobe nandsim id_bytes=0x98,0xdc,0x90,0x26,0x76,0x15,0x01,0x08 bch=1
> 
> This doesn't add fifth_id_byte, ..., seventh_id_byte module parameters,
> because they are redundant.  But the existing first_id_byte, ...,
> fourth_id_byte module parameters are preserved and add "(obsolete)" to
> the description.
> 
> Cc: Artem Bityutskiy <artem.bityutskiy at linux.intel.com>
> Cc: David Woodhouse <dwmw2 at infradead.org>
> Cc: Brian Norris <computersforpeace at gmail.com>
> Cc: linux-mtd at lists.infradead.org
> Signed-off-by: Akinobu Mita <akinobu.mita at gmail.com>
> ---
> * v2
> - use module_param_named() instead of module_param_cb()
> - add "(obsolete)" to old module params description, suggested by Artem

Patch looks good, except for one note below.

> 
>  drivers/mtd/nand/nandsim.c | 42 ++++++++++++++++++++++++------------------
>  1 file changed, 24 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c
> index 504fb32..552ae46 100644
> --- a/drivers/mtd/nand/nandsim.c
> +++ b/drivers/mtd/nand/nandsim.c
> @@ -89,10 +89,6 @@
>  #define CONFIG_NANDSIM_MAX_PARTS  32
>  #endif
>  
> -static uint first_id_byte  = CONFIG_NANDSIM_FIRST_ID_BYTE;
> -static uint second_id_byte = CONFIG_NANDSIM_SECOND_ID_BYTE;
> -static uint third_id_byte  = CONFIG_NANDSIM_THIRD_ID_BYTE;
> -static uint fourth_id_byte = CONFIG_NANDSIM_FOURTH_ID_BYTE;
>  static uint access_delay   = CONFIG_NANDSIM_ACCESS_DELAY;
>  static uint programm_delay = CONFIG_NANDSIM_PROGRAMM_DELAY;
>  static uint erase_delay    = CONFIG_NANDSIM_ERASE_DELAY;
> @@ -113,11 +109,19 @@ static unsigned int overridesize = 0;
>  static char *cache_file = NULL;
>  static unsigned int bbt;
>  static unsigned int bch;
> +static u_char id_bytes[8] = {
> +	[0] = CONFIG_NANDSIM_FIRST_ID_BYTE,
> +	[1] = CONFIG_NANDSIM_SECOND_ID_BYTE,
> +	[2] = CONFIG_NANDSIM_THIRD_ID_BYTE,
> +	[3] = CONFIG_NANDSIM_FOURTH_ID_BYTE,
> +	[4 ... 7] = 0xFF,
> +};
>  
> -module_param(first_id_byte,  uint, 0400);
> -module_param(second_id_byte, uint, 0400);
> -module_param(third_id_byte,  uint, 0400);
> -module_param(fourth_id_byte, uint, 0400);
> +module_param_array(id_bytes, byte, NULL, 0400);
> +module_param_named(first_id_byte, id_bytes[0], byte, 0400);
> +module_param_named(second_id_byte, id_bytes[1], byte, 0400);
> +module_param_named(third_id_byte, id_bytes[2], byte, 0400);
> +module_param_named(fourth_id_byte, id_bytes[3], byte, 0400);
>  module_param(access_delay,   uint, 0400);
>  module_param(programm_delay, uint, 0400);
>  module_param(erase_delay,    uint, 0400);
> @@ -138,10 +142,11 @@ module_param(cache_file,     charp, 0400);
>  module_param(bbt,	     uint, 0400);
>  module_param(bch,	     uint, 0400);
>  
> -MODULE_PARM_DESC(first_id_byte,  "The first byte returned by NAND Flash 'read ID' command (manufacturer ID)");
> -MODULE_PARM_DESC(second_id_byte, "The second byte returned by NAND Flash 'read ID' command (chip ID)");
> -MODULE_PARM_DESC(third_id_byte,  "The third byte returned by NAND Flash 'read ID' command");
> -MODULE_PARM_DESC(fourth_id_byte, "The fourth byte returned by NAND Flash 'read ID' command");
> +MODULE_PARM_DESC(id_bytes,       "The ID bytes returned by NAND Flash 'read ID' command (obsolete)");

A little aggressive on marking this one obsolete, eh? :)

> +MODULE_PARM_DESC(first_id_byte,  "The first byte returned by NAND Flash 'read ID' command (manufacturer ID) (obsolete)");
> +MODULE_PARM_DESC(second_id_byte, "The second byte returned by NAND Flash 'read ID' command (chip ID) (obsolete)");
> +MODULE_PARM_DESC(third_id_byte,  "The third byte returned by NAND Flash 'read ID' command (obsolete)");
> +MODULE_PARM_DESC(fourth_id_byte, "The fourth byte returned by NAND Flash 'read ID' command (obsolete)");
>  MODULE_PARM_DESC(access_delay,   "Initial page access delay (microseconds)");
>  MODULE_PARM_DESC(programm_delay, "Page programm delay (microseconds");
>  MODULE_PARM_DESC(erase_delay,    "Sector erase delay (milliseconds)");
> @@ -306,7 +311,7 @@ struct nandsim {
>  	unsigned int nbparts;
>  
>  	uint busw;              /* flash chip bus width (8 or 16) */
> -	u_char ids[4];          /* chip's ID bytes */
> +	u_char ids[8];          /* chip's ID bytes */
>  	uint32_t options;       /* chip's characteristic bits */
>  	uint32_t state;         /* current chip state */
>  	uint32_t nxstate;       /* next expected state */
> @@ -2214,17 +2219,18 @@ static int __init ns_init_module(void)
>  	 * Perform minimum nandsim structure initialization to handle
>  	 * the initial ID read command correctly
>  	 */
> -	if (third_id_byte != 0xFF || fourth_id_byte != 0xFF)
> +	if (id_bytes[6] != 0xFF || id_bytes[7] != 0xFF)
> +		nand->geom.idbytes = 8;
> +	else if (id_bytes[4] != 0xFF || id_bytes[5] != 0xFF)
> +		nand->geom.idbytes = 6;
> +	else if (id_bytes[2] != 0xFF || id_bytes[3] != 0xFF)
>  		nand->geom.idbytes = 4;
>  	else
>  		nand->geom.idbytes = 2;
>  	nand->regs.status = NS_STATUS_OK(nand);
>  	nand->nxstate = STATE_UNKNOWN;
>  	nand->options |= OPT_PAGE512; /* temporary value */
> -	nand->ids[0] = first_id_byte;
> -	nand->ids[1] = second_id_byte;
> -	nand->ids[2] = third_id_byte;
> -	nand->ids[3] = fourth_id_byte;
> +	memcpy(nand->ids, id_bytes, sizeof(nand->ids));
>  	if (bus_width == 16) {
>  		nand->busw = 16;
>  		chip->options |= NAND_BUSWIDTH_16;

Brian