1 /* 2 * Copyright (C) 2016 Stefan Roese <sr@denx.de> 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <asm/io.h> 9 #include <asm/pnp_def.h> 10 11 #define WINBOND_ENTRY_KEY 0x87 12 #define WINBOND_EXIT_KEY 0xaa 13 14 /* Enable configuration: pass entry key '0x87' into index port dev twice */ 15 static void pnp_enter_conf_state(u16 dev) 16 { 17 u16 port = dev >> 8; 18 19 outb(WINBOND_ENTRY_KEY, port); 20 outb(WINBOND_ENTRY_KEY, port); 21 } 22 23 /* Disable configuration: pass exit key '0xAA' into index port dev */ 24 static void pnp_exit_conf_state(u16 dev) 25 { 26 u16 port = dev >> 8; 27 28 outb(WINBOND_EXIT_KEY, port); 29 } 30 31 /* Bring up early serial debugging output before the RAM is initialized */ 32 void winbond_enable_serial(uint dev, uint iobase, uint irq) 33 { 34 pnp_enter_conf_state(dev); 35 pnp_set_logical_device(dev); 36 pnp_set_enable(dev, 0); 37 pnp_set_iobase(dev, PNP_IDX_IO0, iobase); 38 pnp_set_irq(dev, PNP_IDX_IRQ0, irq); 39 pnp_set_enable(dev, 1); 40 pnp_exit_conf_state(dev); 41 } 42