redonkable/remarkable-linux
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[MTD] [OneNAND] Get correct density from device ID

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Use the higher bits for other purpose.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
This commit is contained in:
Kyungmin Park 2007-12-11 11:23:45 +09:00
parent b21b72cf33
commit e71f04fc92
2 changed files with 17 additions and 4 deletions
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20
drivers/mtd/onenand/onenand_base.c
View file

@ -169,6 +169,18 @@ static int onenand_buffer_address(int dataram1, int sectors, int count)
return ((bsa << ONENAND_BSA_SHIFT) | bsc);
}
/**
* onenand_get_density - [DEFAULT] Get OneNAND density
* @param dev_id OneNAND device ID
*
* Get OneNAND density from device ID
*/
static inline int onenand_get_density(int dev_id)
{
int density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
return (density & ONENAND_DEVICE_DENSITY_MASK);
}
/**
* onenand_command - [DEFAULT] Send command to OneNAND device
* @param mtd MTD device structure
@ -2146,7 +2158,7 @@ static int onenand_otp_walk(struct mtd_info *mtd, loff_t from, size_t len,
*retlen = 0;
density = this->device_id >> ONENAND_DEVICE_DENSITY_SHIFT;
density = onenand_get_density(this->device_id);
if (density < ONENAND_DEVICE_DENSITY_512Mb)
otp_pages = 20;
else
@ -2337,7 +2349,7 @@ static void onenand_check_features(struct mtd_info *mtd)
unsigned int density, process;
/* Lock scheme depends on density and process */
density = this->device_id >> ONENAND_DEVICE_DENSITY_SHIFT;
density = onenand_get_density(this->device_id);
process = this->version_id >> ONENAND_VERSION_PROCESS_SHIFT;
/* Lock scheme */
@ -2386,7 +2398,7 @@ static void onenand_print_device_info(int device, int version)
vcc = device & ONENAND_DEVICE_VCC_MASK;
demuxed = device & ONENAND_DEVICE_IS_DEMUX;
ddp = device & ONENAND_DEVICE_IS_DDP;
density = device >> ONENAND_DEVICE_DENSITY_SHIFT;
density = onenand_get_density(device);
printk(KERN_INFO "%sOneNAND%s %dMB %sV 16-bit (0x%02x)\n",
demuxed ? "" : "Muxed ",
ddp ? "(DDP)" : "",
@ -2478,7 +2490,7 @@ static int onenand_probe(struct mtd_info *mtd)
this->device_id = dev_id;
this->version_id = ver_id;
density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
density = onenand_get_density(dev_id);
this->chipsize = (16 << density) << 20;
/* Set density mask. it is used for DDP */
if (ONENAND_IS_DDP(this))

1
include/linux/mtd/onenand_regs.h
View file

@ -67,6 +67,7 @@
/*
* Device ID Register F001h (R)
*/
#define ONENAND_DEVICE_DENSITY_MASK (0xf)
#define ONENAND_DEVICE_DENSITY_SHIFT (4)
#define ONENAND_DEVICE_IS_DDP (1 << 3)
#define ONENAND_DEVICE_IS_DEMUX (1 << 2)