From: Franklin S Cooper Jr fcooper@ti.com
If SW 8 pins 0 and 1 indicate that NAND should be enabled then the pins pinmux must be reconfigured for NAND mode.
Therefore, enable NAND by reconfiguring the pinmux.
Signed-off-by: Franklin S Cooper Jr fcooper@ti.com Signed-off-by: Faiz Abbas faiz_abbas@ti.com --- board/ti/dra7xx/evm.c | 56 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+)
diff --git a/board/ti/dra7xx/evm.c b/board/ti/dra7xx/evm.c index d69641e3a0..446ce8399c 100644 --- a/board/ti/dra7xx/evm.c +++ b/board/ti/dra7xx/evm.c @@ -27,6 +27,7 @@ #include <environment.h> #include <dwc3-uboot.h> #include <dwc3-omap-uboot.h> +#include <i2c.h> #include <ti-usb-phy-uboot.h> #include <miiphy.h>
@@ -55,6 +56,10 @@ DECLARE_GLOBAL_DATA_PTR;
#define SYSINFO_BOARD_NAME_MAX_LEN 37
+/* I2C I/O Expander */ +#define NAND_PCF8575_ADDR 0x21 +#define NAND_PCF8575_I2C_BUS_NUM 0 + const struct omap_sysinfo sysinfo = { "Board: UNKNOWN(DRA7 EVM) REV UNKNOWN\n" }; @@ -777,6 +782,44 @@ void set_muxconf_regs(void) early_padconf, ARRAY_SIZE(early_padconf)); }
+#if defined(CONFIG_NAND) +static int nand_sw_detect(void) +{ + int rc; + uchar data[2]; + struct udevice *dev; + + rc = i2c_get_chip_for_busnum(NAND_PCF8575_I2C_BUS_NUM, + NAND_PCF8575_ADDR, 0, &dev); + if (rc) + return -1; + + rc = dm_i2c_read(dev, 0, (uint8_t *)&data, sizeof(data)); + if (rc) + return -1; + + /* We are only interested in P10 and P11 on PCF8575 which is equal to + * bits 8 and 9. + */ + data[1] = data[1] & 0x3; + + /* Ensure only P11 is set and P10 is cleared. This ensures only + * NAND (P10) is configured and not NOR (P11) which are both low + * true signals. NAND and NOR settings should not be enabled at + * the same time. + */ + if (data[1] == 0x2) + return 0; + + return -1; +} +#else +int nand_sw_detect(void) +{ + return -1; +} +#endif + #ifdef CONFIG_IODELAY_RECALIBRATION void recalibrate_iodelay(void) { @@ -796,6 +839,19 @@ void recalibrate_iodelay(void) npads = ARRAY_SIZE(dra71x_core_padconf_array); iodelay = dra71_iodelay_cfg_array; niodelays = ARRAY_SIZE(dra71_iodelay_cfg_array); + /* If SW8 on the EVM is set to enable NAND then + * overwrite the pins used by VOUT3 with NAND. + */ + if (!nand_sw_detect()) { + delta_pads = dra71x_nand_padconf_array; + delta_npads = + ARRAY_SIZE(dra71x_nand_padconf_array); + } else { + delta_pads = dra71x_vout3_padconf_array; + delta_npads = + ARRAY_SIZE(dra71x_vout3_padconf_array); + } + } else if (board_is_dra72x_revc_or_later()) { delta_pads = dra72x_rgmii_padconf_array_revc; delta_npads =