[U-Boot] [PATCH v1 2/7] board/ti/am335x: add support for beaglebone NAND cape

Pekon Gupta
2014-07-04T19:05:12Z

Beaglebone Board can be connected to expansion boards to add devices to them.
These expansion boards are called 'capes'. This patch adds support for
following versions of Beaglebone(AM335x) NAND capes
(a) NAND Device with bus-width=16, block-size=128k, page-size=2k, oob-size=64
(b) NAND Device with bus-width=16, block-size=256k, page-size=4k, oob-size=224
Further information and datasheets can be found at [1] and [2]

* How to boot from NAND using Memory Expander + NAND Cape ? *
- Important: As BOOTSEL values are sampled only at POR, so after changing any
setting on SW2 (DIP switch), disconnect and reconnect all board power supply
(including mini-USB console port) to POR the beaglebone.

- Selection of ECC scheme
for NAND cape(a), ROM code expects BCH8_HW ecc-scheme
for NAND cape(b), ROM code expects BCH16_HW ecc-scheme

- Selction of boot modes can be controlled via DIP switch(SW2) present on
Memory Expander cape.
SW2[SWITCH_BOOT] == OFF follow default boot order MMC-> SPI -> UART -> USB
SW2[SWITCH_BOOT] == ON boot mode selected via DIP switch(SW2)
So to flash NAND, first boot via MMC or other sources and then switch to
SW2[SWITCH_BOOT]=ON to boot from NAND Cape.

- For NAND boot following switch settings need to be followed
SW2[ 1] = OFF (SYSBOOT[ 0]==1: NAND boot mode selected )
SW2[ 2] = OFF (SYSBOOT[ 1]==1: -- do -- )
SW2[ 3] = ON (SYSBOOT[ 2]==0: -- do -- )
SW2[ 4] = ON (SYSBOOT[ 3]==0: -- do -- )
SW2[ 5] = OFF (SYSBOOT[ 4]==1: -- do -- )
SW2[ 6] = OFF (SYSBOOT[ 8]==1: 0:x8 device, 1:x16 device )
SW2[ 7] = ON (SYSBOOT[ 9]==0: ECC done by ROM )
SW2[ 8] = ON (SYSBOOT[10]==0: Non Muxed device )
SW2[ 9] = ON (SYSBOOT[11]==0: -- do -- )

[1] http://beagleboardtoys.info/index.php?title=BeagleBone_Memory_Expansion
[2] http://beagleboardtoys.info/index.php?title=BeagleBone_4Gb_16-Bit_NAND_Module

Signed-off-by: Pekon Gupta <pekon@ti.com>
---
board/ti/am335x/mux.c | 58 +++++++++++++++++++++++++++++++++------------------
1 file changed, 38 insertions(+), 20 deletions(-)

diff --git a/board/ti/am335x/mux.c b/board/ti/am335x/mux.c
index b2bfda5..439da4b 100644
--- a/board/ti/am335x/mux.c
+++ b/board/ti/am335x/mux.c
@@ -171,25 +171,36 @@ static struct module_pin_mux mii1_pin_mux[] = {
{-1},
};

+#ifdef CONFIG_NAND
static struct module_pin_mux nand_pin_mux[] = {
- {OFFSET(gpmc_ad0), (MODE(0) | PULLUP_EN | RXACTIVE)}, /* NAND AD0 */
- {OFFSET(gpmc_ad1), (MODE(0) | PULLUP_EN | RXACTIVE)}, /* NAND AD1 */
- {OFFSET(gpmc_ad2), (MODE(0) | PULLUP_EN | RXACTIVE)}, /* NAND AD2 */
- {OFFSET(gpmc_ad3), (MODE(0) | PULLUP_EN | RXACTIVE)}, /* NAND AD3 */
- {OFFSET(gpmc_ad4), (MODE(0) | PULLUP_EN | RXACTIVE)}, /* NAND AD4 */
- {OFFSET(gpmc_ad5), (MODE(0) | PULLUP_EN | RXACTIVE)}, /* NAND AD5 */
- {OFFSET(gpmc_ad6), (MODE(0) | PULLUP_EN | RXACTIVE)}, /* NAND AD6 */
- {OFFSET(gpmc_ad7), (MODE(0) | PULLUP_EN | RXACTIVE)}, /* NAND AD7 */
- {OFFSET(gpmc_wait0), (MODE(0) | RXACTIVE | PULLUP_EN)}, /* NAND WAIT */
- {OFFSET(gpmc_wpn), (MODE(7) | PULLUP_EN | RXACTIVE)}, /* NAND_WPN */
- {OFFSET(gpmc_csn0), (MODE(0) | PULLUDEN)}, /* NAND_CS0 */
- {OFFSET(gpmc_advn_ale), (MODE(0) | PULLUDEN)}, /* NAND_ADV_ALE */
- {OFFSET(gpmc_oen_ren), (MODE(0) | PULLUDEN)}, /* NAND_OE */
- {OFFSET(gpmc_wen), (MODE(0) | PULLUDEN)}, /* NAND_WEN */
- {OFFSET(gpmc_be0n_cle), (MODE(0) | PULLUDEN)}, /* NAND_BE_CLE */
+ {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) | PULLUP_EN | RXACTIVE)}, /* nWAIT */
+ {OFFSET(gpmc_wpn), (MODE(7) | PULLUP_EN)}, /* nWP */
+ {OFFSET(gpmc_csn0), (MODE(0) | PULLUP_EN)}, /* nCS */
+ {OFFSET(gpmc_wen), (MODE(0) | PULLDOWN_EN)}, /* WEN */
+ {OFFSET(gpmc_oen_ren), (MODE(0) | PULLDOWN_EN)}, /* OE */
+ {OFFSET(gpmc_advn_ale), (MODE(0) | PULLDOWN_EN)}, /* ADV_ALE */
+ {OFFSET(gpmc_be0n_cle), (MODE(0) | PULLDOWN_EN)}, /* BE_CLE */
{-1},
};
-
+#endif
#if defined(CONFIG_NOR) && !defined(CONFIG_NOR_BOOT)
static struct module_pin_mux bone_norcape_pin_mux[] = {
{OFFSET(lcd_data0), MODE(1) | PULLUDEN | RXACTIVE}, /* NOR_A0 */
@@ -336,11 +347,12 @@ void enable_board_pin_mux(struct am335x_baseboard_id *header)
configure_module_pin_mux(i2c1_pin_mux);
configure_module_pin_mux(mii1_pin_mux);
configure_module_pin_mux(mmc0_pin_mux);
-#ifndef CONFIG_NOR
- configure_module_pin_mux(mmc1_pin_mux);
-#endif
-#if defined(CONFIG_NOR) && !defined(CONFIG_NOR_BOOT)
+#if defined(CONFIG_NAND)
+ configure_module_pin_mux(nand_pin_mux);
+#elif defined(CONFIG_NOR) && !defined(CONFIG_NOR_BOOT)
configure_module_pin_mux(bone_norcape_pin_mux);
+#else
+ configure_module_pin_mux(mmc1_pin_mux);
#endif
} else if (board_is_gp_evm(header)) {
/* General Purpose EVM */
@@ -351,8 +363,10 @@ void enable_board_pin_mux(struct am335x_baseboard_id *header)
if (profile & ~PROFILE_2)
configure_module_pin_mux(i2c1_pin_mux);
/* Profiles 2 & 3 don't have NAND */
+#ifdef CONFIG_NAND
if (profile & ~(PROFILE_2 | PROFILE_3))
configure_module_pin_mux(nand_pin_mux);
+#endif
else if (profile == PROFILE_2) {
configure_module_pin_mux(mmc1_pin_mux);
configure_module_pin_mux(spi0_pin_mux);
@@ -377,7 +391,11 @@ void enable_board_pin_mux(struct am335x_baseboard_id *header)
configure_module_pin_mux(i2c1_pin_mux);
configure_module_pin_mux(mii1_pin_mux);
configure_module_pin_mux(mmc0_pin_mux);
+#if defined(CONFIG_NAND)
+ configure_module_pin_mux(nand_pin_mux);
+#else
configure_module_pin_mux(mmc1_pin_mux);
+#endif
} else {
puts("Unknown board, cannot configure pinmux.");
hang();
--
1.8.5.1.163.gd7aced9