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authorDavid Brownell <dbrownell@users.sourceforge.net>2009-04-28 13:19:50 -0700
committerScott Wood <scottwood@freescale.com>2009-07-07 17:44:55 -0500
commitfcb774777562bb7bcdc53c608d0e6bae906ce0f6 (patch)
treedbff9f0c68ff74737d550a6098e93841b8378255 /drivers/mtd
parent59869ca72df8bc4e4ffa9dd17cb6673bbe010272 (diff)
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davinci_nand: cleanup I (minor)
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>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/nand/davinci_nand.c55
1 files changed, 22 insertions, 33 deletions
diff --git a/drivers/mtd/nand/davinci_nand.c b/drivers/mtd/nand/davinci_nand.c
index 8ef18b8..8b22024 100644
--- a/drivers/mtd/nand/davinci_nand.c
+++ b/drivers/mtd/nand/davinci_nand.c
@@ -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_addr->NANDF1ECC;
- dummy = emif_addr->NANDF2ECC;
- dummy = emif_addr->NANDF3ECC;
- dummy = emif_addr->NANDF4ECC;
+ dummy = emif_regs->NANDF1ECC;
+#ifdef CONFIG_SYS_DAVINCI_BROKEN_ECC
+ dummy = emif_regs->NANDF2ECC;
+ dummy = emif_regs->NANDF3ECC;
+ dummy = emif_regs->NANDF4ECC;
+#endif
- 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();