PWRCR 228 arch/sh/boards/mach-sdk7786/setup.c fpga_write_reg(fpga_read_reg(PWRCR) | PWRCR_PDWNREQ, PWRCR); PWRCR 235 arch/sh/boards/mach-sdk7786/setup.c while ((fpga_read_reg(PWRCR) & PWRCR_PDWNACK) == 0)