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davinci_nand: cleanup I (minor)

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Minor cleanup for DaVinci NAND code:

 - Use I/O addresses from nand_chip; CONFIG_SYS_NAND_BASE won't
   be defined when there are multiple chipselect lines in use
   (as with common 2 GByte chips).

 - Cleanup handling of EMIF control registers
    * Only need one pointer pointing to them
    * Remove incorrect and unused struct supersetting them

 - Use the standard waitfunc; we don't need a custom version

 - Partial legacy cleanup:
    * Don't initialize every board like it's a DM6446 EVM
    * #ifdef a bit more code for BROKEN_ECC

Sanity checked with small page NAND on dm355 and dm6446 EVMs;
and large page on dm355 EVM (packaged as two devices, not one).

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
David Brownell 2009-04-28 13:19:50 -07:00 committed by Scott Wood
parent 59869ca72d
commit fcb7747775
2 changed files with 22 additions and 87 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

55
drivers/mtd/nand/davinci_nand.c
View file

@ -49,6 +49,8 @@
extern struct nand_chip nand_dev_desc[CONFIG_SYS_MAX_NAND_DEVICE];
static emif_registers *const emif_regs = (void *) DAVINCI_ASYNC_EMIF_CNTRL_BASE;
static void nand_davinci_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
struct nand_chip *this = mtd->priv;
@ -115,34 +117,31 @@ static struct nand_ecclayout davinci_nand_ecclayout = {
static void nand_davinci_enable_hwecc(struct mtd_info *mtd, int mode)
{
emifregs emif_addr;
int dummy;
emif_addr = (emifregs)DAVINCI_ASYNC_EMIF_CNTRL_BASE;
dummy = emif_regs->NANDF1ECC;
#ifdef CONFIG_SYS_DAVINCI_BROKEN_ECC
dummy = emif_regs->NANDF2ECC;
dummy = emif_regs->NANDF3ECC;
dummy = emif_regs->NANDF4ECC;
#endif
dummy = emif_addr->NANDF1ECC;
dummy = emif_addr->NANDF2ECC;
dummy = emif_addr->NANDF3ECC;
dummy = emif_addr->NANDF4ECC;
emif_addr->NANDFCR |= (1 << 8);
/* FIXME: only chipselect 0 is supported for now */
emif_regs->NANDFCR |= 1 << 8;
}
static u_int32_t nand_davinci_readecc(struct mtd_info *mtd, u_int32_t region)
{
u_int32_t ecc = 0;
emifregs emif_base_addr;
emif_base_addr = (emifregs)DAVINCI_ASYNC_EMIF_CNTRL_BASE;
if (region == 1)
ecc = emif_base_addr->NANDF1ECC;
ecc = emif_regs->NANDF1ECC;
else if (region == 2)
ecc = emif_base_addr->NANDF2ECC;
ecc = emif_regs->NANDF2ECC;
else if (region == 3)
ecc = emif_base_addr->NANDF3ECC;
ecc = emif_regs->NANDF3ECC;
else if (region == 4)
ecc = emif_base_addr->NANDF4ECC;
ecc = emif_regs->NANDF4ECC;
return(ecc);
}
@ -369,24 +368,18 @@ static int nand_davinci_correct_data(struct mtd_info *mtd, u_char *dat, u_char *
static int nand_davinci_dev_ready(struct mtd_info *mtd)
{
emifregs emif_addr;
emif_addr = (emifregs)DAVINCI_ASYNC_EMIF_CNTRL_BASE;
return(emif_addr->NANDFSR & 0x1);
}
static int nand_davinci_waitfunc(struct mtd_info *mtd, struct nand_chip *this)
{
while(!nand_davinci_dev_ready(mtd)) {;}
*NAND_CE0CLE = NAND_STATUS;
return(*NAND_CE0DATA);
return emif_regs->NANDFSR & 0x1;
}
static void nand_flash_init(void)
{
/* This is for DM6446 EVM and *very* similar. DO NOT GROW THIS!
* Instead, have your board_init() set EMIF timings, based on its
* knowledge of the clocks and what devices are hooked up ... and
* don't even do that unless no UBL handled it.
*/
#ifdef CONFIG_SOC_DM6446
u_int32_t acfg1 = 0x3ffffffc;
emifregs emif_regs;
/*------------------------------------------------------------------*
* NAND FLASH CHIP TIMEOUT @ 459 MHz *
@ -408,17 +401,14 @@ static void nand_flash_init(void)
| (0 << 0 ) /* asyncSize 8-bit bus */
;
emif_regs = (emifregs)DAVINCI_ASYNC_EMIF_CNTRL_BASE;
emif_regs->AB1CR = acfg1; /* CS2 */
emif_regs->NANDFCR = 0x00000101; /* NAND flash on CS2 */
#endif
}
int board_nand_init(struct nand_chip *nand)
{
nand->IO_ADDR_R = (void __iomem *)NAND_CE0DATA;
nand->IO_ADDR_W = (void __iomem *)NAND_CE0DATA;
nand->chip_delay = 0;
nand->select_chip = nand_davinci_select_chip;
#ifdef CONFIG_SYS_NAND_USE_FLASH_BBT
@ -452,7 +442,6 @@ int board_nand_init(struct nand_chip *nand)
nand->cmd_ctrl = nand_davinci_hwcontrol;
nand->dev_ready = nand_davinci_dev_ready;
nand->waitfunc = nand_davinci_waitfunc;
nand_flash_init();

54
include/asm-arm/arch-davinci/nand_defs.h
View file

@ -31,60 +31,6 @@
#define MASK_CLE 0x10
#define MASK_ALE 0x0a
#define NAND_CE0CLE ((volatile u_int8_t *)(CONFIG_SYS_NAND_BASE + 0x10))
#define NAND_CE0ALE ((volatile u_int8_t *)(CONFIG_SYS_NAND_BASE + 0x0a))
#define NAND_CE0DATA ((volatile u_int8_t *)CONFIG_SYS_NAND_BASE)
typedef struct {
u_int32_t NRCSR;
u_int32_t AWCCR;
u_int8_t RSVD0[8];
u_int32_t AB1CR;
u_int32_t AB2CR;
u_int32_t AB3CR;
u_int32_t AB4CR;
u_int8_t RSVD1[32];
u_int32_t NIRR;
u_int32_t NIMR;
u_int32_t NIMSR;
u_int32_t NIMCR;
u_int8_t RSVD2[16];
u_int32_t NANDFCR;
u_int32_t NANDFSR;
u_int8_t RSVD3[8];
u_int32_t NANDF1ECC;
u_int32_t NANDF2ECC;
u_int32_t NANDF3ECC;
u_int32_t NANDF4ECC;
u_int8_t RSVD4[4];
u_int32_t IODFTECR;
u_int32_t IODFTGCR;
u_int8_t RSVD5[4];
u_int32_t IODFTMRLR;
u_int32_t IODFTMRMR;
u_int32_t IODFTMRMSBR;
u_int8_t RSVD6[20];
u_int32_t MODRNR;
u_int8_t RSVD7[76];
u_int32_t CE0DATA;
u_int32_t CE0ALE;
u_int32_t CE0CLE;
u_int8_t RSVD8[4];
u_int32_t CE1DATA;
u_int32_t CE1ALE;
u_int32_t CE1CLE;
u_int8_t RSVD9[4];
u_int32_t CE2DATA;
u_int32_t CE2ALE;
u_int32_t CE2CLE;
u_int8_t RSVD10[4];
u_int32_t CE3DATA;
u_int32_t CE3ALE;
u_int32_t CE3CLE;
} nand_registers;
typedef volatile nand_registers *nandregs;
#define NAND_READ_START 0x00
#define NAND_READ_END 0x30
#define NAND_STATUS 0x70