SPI_COMMAND
tegra_sflash_writel(tsd, command, SPI_COMMAND);
SPI_COMMAND);
tegra_sflash_writel(tsd, tsd->def_command_reg, SPI_COMMAND);
tegra_sflash_writel(tsd, tsd->def_command_reg, SPI_COMMAND);
tegra_sflash_writel(tsd, tsd->command_reg, SPI_COMMAND);
tegra_sflash_readl(tsd, SPI_COMMAND);