Tested on i.MX31 Litekit.
Signed-off-by: Magnus Lilja lilja.magnus@gmail.com Acked-by: Scott Wood scottwood@freescale.com ---
Change since v1: Renamed sc_regs variable for i.MX31 to cc_regs.
drivers/mtd/nand/mxc_nand.c | 34 +++++++++++++++++++++++++++++++--- 1 files changed, 31 insertions(+), 3 deletions(-)
diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c index eb0323f..3ce3adb 100644 --- a/drivers/mtd/nand/mxc_nand.c +++ b/drivers/mtd/nand/mxc_nand.c @@ -149,6 +149,36 @@ static struct nand_ecclayout nand_soft_eccoob = { }; #endif
+#ifdef CONFIG_MX27 +static int is_16bit_nand(void) +{ + struct system_control_regs *sc_regs = + (struct system_control_regs *)IMX_SYSTEM_CTL_BASE; + + if (readl(&sc_regs->fmcr) & NF_16BIT_SEL) + return 1; + else + return 0; +} +#elif defined(CONFIG_MX31) +static int is_16bit_nand(void) +{ + struct clock_control_regs *cc_regs = + (struct clock_control_regs *)CCM_BASE; + + if (readl(&cc_regs->rcsr) & CCM_RCSR_NF16B) + return 1; + else + return 0; +} +#else +#warning "8/16 bit NAND autodetection not supported" +static int is_16bit_nand(void) +{ + return 0; +} +#endif + static uint32_t *mxc_nand_memcpy32(uint32_t *dest, uint32_t *source, size_t size) { uint32_t *d = dest; @@ -808,8 +838,6 @@ static void mxc_nand_command(struct mtd_info *mtd, unsigned command,
int board_nand_init(struct nand_chip *this) { - struct system_control_regs *sc_regs = - (struct system_control_regs *)IMX_SYSTEM_CTL_BASE; struct mtd_info *mtd; uint16_t tmp; int err = 0; @@ -871,7 +899,7 @@ int board_nand_init(struct nand_chip *this) writew(0x4, &host->regs->nfc_wrprot);
/* NAND bus width determines access funtions used by upper layer */ - if (readl(&sc_regs->fmcr) & NF_16BIT_SEL) + if (is_16bit_nand()) this->options |= NAND_BUSWIDTH_16;
host->pagesize_2k = 0;