diff options
| -rw-r--r-- | drivers/mtd/nand/lpc32xx_slc.c | 27 |
1 files changed, 15 insertions, 12 deletions
diff --git a/drivers/mtd/nand/lpc32xx_slc.c b/drivers/mtd/nand/lpc32xx_slc.c index abfec13868e5..9ac0f3b5554c 100644 --- a/drivers/mtd/nand/lpc32xx_slc.c +++ b/drivers/mtd/nand/lpc32xx_slc.c @@ -94,22 +94,25 @@ /********************************************************************** * slc_tac register definitions **********************************************************************/ +/* Computation of clock cycles on basis of controller and device clock rates */ +#define SLCTAC_CLOCKS(c, n, s) (((1 + (c / n)) & 0xF) << s) + /* Clock setting for RDY write sample wait time in 2*n clocks */ #define SLCTAC_WDR(n) (((n) & 0xF) << 28) /* Write pulse width in clock cycles, 1 to 16 clocks */ -#define SLCTAC_WWIDTH(n) (((n) & 0xF) << 24) +#define SLCTAC_WWIDTH(c, n) (SLCTAC_CLOCKS(c, n, 24)) /* Write hold time of control and data signals, 1 to 16 clocks */ -#define SLCTAC_WHOLD(n) (((n) & 0xF) << 20) +#define SLCTAC_WHOLD(c, n) (SLCTAC_CLOCKS(c, n, 20)) /* Write setup time of control and data signals, 1 to 16 clocks */ -#define SLCTAC_WSETUP(n) (((n) & 0xF) << 16) +#define SLCTAC_WSETUP(c, n) (SLCTAC_CLOCKS(c, n, 16)) /* Clock setting for RDY read sample wait time in 2*n clocks */ #define SLCTAC_RDR(n) (((n) & 0xF) << 12) /* Read pulse width in clock cycles, 1 to 16 clocks */ -#define SLCTAC_RWIDTH(n) (((n) & 0xF) << 8) +#define SLCTAC_RWIDTH(c, n) (SLCTAC_CLOCKS(c, n, 8)) /* Read hold time of control and data signals, 1 to 16 clocks */ -#define SLCTAC_RHOLD(n) (((n) & 0xF) << 4) +#define SLCTAC_RHOLD(c, n) (SLCTAC_CLOCKS(c, n, 4)) /* Read setup time of control and data signals, 1 to 16 clocks */ -#define SLCTAC_RSETUP(n) (((n) & 0xF) << 0) +#define SLCTAC_RSETUP(c, n) (SLCTAC_CLOCKS(c, n, 0)) /********************************************************************** * slc_ecc register definitions @@ -240,13 +243,13 @@ static void lpc32xx_nand_setup(struct lpc32xx_nand_host *host) /* Compute clock setup values */ tmp = SLCTAC_WDR(host->ncfg->wdr_clks) | - SLCTAC_WWIDTH(1 + (clkrate / host->ncfg->wwidth)) | - SLCTAC_WHOLD(1 + (clkrate / host->ncfg->whold)) | - SLCTAC_WSETUP(1 + (clkrate / host->ncfg->wsetup)) | + SLCTAC_WWIDTH(clkrate, host->ncfg->wwidth) | + SLCTAC_WHOLD(clkrate, host->ncfg->whold) | + SLCTAC_WSETUP(clkrate, host->ncfg->wsetup) | SLCTAC_RDR(host->ncfg->rdr_clks) | - SLCTAC_RWIDTH(1 + (clkrate / host->ncfg->rwidth)) | - SLCTAC_RHOLD(1 + (clkrate / host->ncfg->rhold)) | - SLCTAC_RSETUP(1 + (clkrate / host->ncfg->rsetup)); + SLCTAC_RWIDTH(clkrate, host->ncfg->rwidth) | + SLCTAC_RHOLD(clkrate, host->ncfg->rhold) | + SLCTAC_RSETUP(clkrate, host->ncfg->rsetup); writel(tmp, SLC_TAC(host->io_base)); } |