From da09d02c57ac4f48347087d9d1663a042a541e13 Mon Sep 17 00:00:00 2001 From: Felix Held Date: Sun, 1 Jun 2014 21:44:43 +0200 Subject: superio/nuvoton: factor out generic romstage components The romstage of Nuvoton Super I/O chips (but not Nuvoton BMC chips) is identical, so the early_serial.c file can be moved under nuvoton/common. The Nuvoton BMC chip WPCM450 is however left untouched. Change-Id: I4663176c1003b24a49a9fe5f9ebd27a1963b5565 Signed-off-by: Felix Held Reviewed-on: http://review.coreboot.org/5909 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel Reviewed-by: Edward O'Callaghan Reviewed-by: Dave Frodin --- src/superio/nuvoton/common/early_serial.c | 75 +++++++++++++++++++++++++++++++ src/superio/nuvoton/common/nuvoton.h | 30 +++++++++++++ 2 files changed, 105 insertions(+) create mode 100644 src/superio/nuvoton/common/early_serial.c create mode 100644 src/superio/nuvoton/common/nuvoton.h (limited to 'src/superio/nuvoton/common') diff --git a/src/superio/nuvoton/common/early_serial.c b/src/superio/nuvoton/common/early_serial.c new file mode 100644 index 0000000000..1cbcee8361 --- /dev/null +++ b/src/superio/nuvoton/common/early_serial.c @@ -0,0 +1,75 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2011 Advanced Micro Devices, Inc. + * Copyright (C) 2014 Edward O'Callaghan + * Copyright (C) 2014 Felix Held + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/* + * A generic romstage (pre-ram) driver for Nuvoton variant Super I/O chips. + * + * The following is derived directly from the vendor Nuvoton's data-sheets: + * + * To toggle between `configuration mode` and `normal operation mode` as to + * manipulate the various LDN's in Nuvoton Super I/O's we are required to + * pass magic numbers `passwords keys`. + * + * NUVOTON_ENTRY_KEY := enable configuration : 0x87 + * NUVOTON_EXIT_KEY := disable configuration : 0xAA + * + * To modify a LDN's configuration register, we use the index port to select + * the index of the LDN and then write to the data port to alter the + * parameters. A default index, data port pair is 0x4E, 0x4F respectively, a + * user modified pair is 0x2E, 0x2F respectively. + * + */ + +#include +#include +#include +#include "nuvoton.h" + +#define NUVOTON_ENTRY_KEY 0x87 +#define NUVOTON_EXIT_KEY 0xAA + +/* Enable configuration: pass entry key '0x87' into index port dev + * two times. */ +static void pnp_enter_conf_state(device_t dev) +{ + u16 port = dev >> 8; + outb(NUVOTON_ENTRY_KEY, port); + outb(NUVOTON_ENTRY_KEY, port); +} + +/* Disable configuration: pass exit key '0xAA' into index port dev. */ +static void pnp_exit_conf_state(device_t dev) +{ + u16 port = dev >> 8; + outb(NUVOTON_EXIT_KEY, port); +} + +/* Bring up early serial debugging output before the RAM is initialized. */ +void nuvoton_enable_serial(device_t dev, u16 iobase) +{ + pnp_enter_conf_state(dev); + pnp_set_logical_device(dev); + pnp_set_enable(dev, 0); + pnp_set_iobase(dev, PNP_IDX_IO0, iobase); + pnp_set_enable(dev, 1); + pnp_exit_conf_state(dev); +} diff --git a/src/superio/nuvoton/common/nuvoton.h b/src/superio/nuvoton/common/nuvoton.h new file mode 100644 index 0000000000..e9e8d4b2c9 --- /dev/null +++ b/src/superio/nuvoton/common/nuvoton.h @@ -0,0 +1,30 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2014 Edward O'Callaghan + * Copyright (C) 2014 Felix Held + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef SUPERIO_NUVOTON_COMMON_ROMSTAGE_H +#define SUPERIO_NUVOTON_COMMON_ROMSTAGE_H + +#include +#include + +void nuvoton_enable_serial(device_t dev, u16 iobase); + +#endif /* SUPERIO_NUVOTON_COMMON_ROMSTAGE_H */ -- cgit v1.2.3