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board/ti/am43xx: add support for parallel NAND

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This patch adds support for NAND device connected to GPMC chip-select on
following AM43xx EVM boards.

am437x-gp-evm: On this board, NAND Flash signals are muxed with eMMC, thus at a
  time either eMMC or NAND can be enabled. Selection between eMMC and NAND is
  controlled by:
  (a) Statically using Jumper on connecter (J89) present on board.
  (a) If Jumper on J89 is NOT used, then selection can be dynamically controlled
      by driving SPI2_CS0[MUX_MODE=GPIO] pin via software:
      SPI2_CS0 == 0: NAND (default)
      SPI2_CS0 == 1: eMMC

am43x-epos-evm: On this board, NAND Flash control lines are muxed with QSPI,
  Thus only one of the two can be used at a time. Selection is controlled by:
  (a) Dynamically driving following GPIO pin from software
      GPMC_A0(GPIO) == 0 NAND is selected (default)

NAND device (MT29F4G08AB) on these boards has:
 - data-width=8bits
 - blocksize=256KB
 - pagesize=4KB
 - oobsize=224 bytes
For above NAND device, ROM code expects the boot-loader to be flashed in BCH16
ECC scheme for NAND boot, So by default BCH16 ECC is enabled for AM43xx EVMs.

Signed-off-by: Pekon Gupta <pekon@ti.com>
This commit is contained in:
pekon gupta
2014-07-22 16:03:22 +05:30
committed by Tom Rini
parent 3df3bc1e1d
commit e53ad4b445
3 changed files with 107 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
board/ti/am43xx/board.c
View File

@@ -626,6 +626,7 @@ int board_init(void)
modena_init0_bw_integer, modena_init0_watermark_0;
gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100;
gpmc_init();
/* Clear all important bits for DSS errata that may need to be tweaked*/
mreqprio_0 = readl(&cdev->mreqprio_0) & MREQPRIO_0_SAB_INIT1_MASK &

43
board/ti/am43xx/mux.c
View File

@@ -73,7 +73,38 @@ static struct module_pin_mux gpio5_7_pin_mux[] = {
{-1},
};
static struct module_pin_mux qspi_pin_mux[] = {
#ifdef CONFIG_NAND
static struct module_pin_mux nand_pin_mux[] = {
{OFFSET(gpmc_ad0), (MODE(0) | PULLUDDIS | RXACTIVE)}, /* AD0 */
{OFFSET(gpmc_ad1), (MODE(0) | PULLUDDIS | RXACTIVE)}, /* AD1 */
{OFFSET(gpmc_ad2), (MODE(0) | PULLUDDIS | RXACTIVE)}, /* AD2 */
{OFFSET(gpmc_ad3), (MODE(0) | PULLUDDIS | RXACTIVE)}, /* AD3 */
{OFFSET(gpmc_ad4), (MODE(0) | PULLUDDIS | RXACTIVE)}, /* AD4 */
{OFFSET(gpmc_ad5), (MODE(0) | PULLUDDIS | RXACTIVE)}, /* AD5 */
{OFFSET(gpmc_ad6), (MODE(0) | PULLUDDIS | RXACTIVE)}, /* AD6 */
{OFFSET(gpmc_ad7), (MODE(0) | PULLUDDIS | RXACTIVE)}, /* AD7 */
#ifdef CONFIG_SYS_NAND_BUSWIDTH_16BIT
{OFFSET(gpmc_ad8), (MODE(0) | PULLUDDIS | RXACTIVE)}, /* AD8 */
{OFFSET(gpmc_ad9), (MODE(0) | PULLUDDIS | RXACTIVE)}, /* AD9 */
{OFFSET(gpmc_ad10), (MODE(0) | PULLUDDIS | RXACTIVE)}, /* AD10 */
{OFFSET(gpmc_ad11), (MODE(0) | PULLUDDIS | RXACTIVE)}, /* AD11 */
{OFFSET(gpmc_ad12), (MODE(0) | PULLUDDIS | RXACTIVE)}, /* AD12 */
{OFFSET(gpmc_ad13), (MODE(0) | PULLUDDIS | RXACTIVE)}, /* AD13 */
{OFFSET(gpmc_ad14), (MODE(0) | PULLUDDIS | RXACTIVE)}, /* AD14 */
{OFFSET(gpmc_ad15), (MODE(0) | PULLUDDIS | RXACTIVE)}, /* AD15 */
#endif
{OFFSET(gpmc_wait0), (MODE(0) | RXACTIVE | PULLUP_EN)}, /* Wait */
{OFFSET(gpmc_wpn), (MODE(7) | PULLUP_EN)}, /* Write Protect */
{OFFSET(gpmc_csn0), (MODE(0) | PULLUP_EN)}, /* Chip-Select */
{OFFSET(gpmc_wen), (MODE(0) | PULLDOWN_EN)}, /* Write Enable */
{OFFSET(gpmc_oen_ren), (MODE(0) | PULLDOWN_EN)}, /* Read Enable */
{OFFSET(gpmc_advn_ale), (MODE(0) | PULLDOWN_EN)}, /* Addr Latch Enable*/
{OFFSET(gpmc_be0n_cle), (MODE(0) | PULLDOWN_EN)}, /* Byte Enable */
{-1},
};
#endif
static __maybe_unused struct module_pin_mux qspi_pin_mux[] = {
{OFFSET(gpmc_csn0), (MODE(3) | PULLUP_EN | RXACTIVE)}, /* QSPI_CS0 */
{OFFSET(gpmc_csn3), (MODE(2) | PULLUP_EN | RXACTIVE)}, /* QSPI_CLK */
{OFFSET(gpmc_advn_ale), (MODE(3) | PULLUP_EN | RXACTIVE)}, /* QSPI_D0 */
@@ -97,12 +128,22 @@ void enable_board_pin_mux(void)
if (board_is_gpevm()) {
configure_module_pin_mux(gpio5_7_pin_mux);
configure_module_pin_mux(rgmii1_pin_mux);
#if defined(CONFIG_NAND)
configure_module_pin_mux(nand_pin_mux);
#endif
} else if (board_is_sk()) {
configure_module_pin_mux(rgmii1_pin_mux);
#if defined(CONFIG_NAND)
printf("Error: NAND flash not present on this board\n");
#endif
configure_module_pin_mux(qspi_pin_mux);
} else if (board_is_eposevm()) {
configure_module_pin_mux(rmii1_pin_mux);
#if defined(CONFIG_NAND)
configure_module_pin_mux(nand_pin_mux);
#else
configure_module_pin_mux(qspi_pin_mux);
#endif
}
}