Aaron Durbin (adurbin@google.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/4878
-gerrit
commit 92096b4e589165b1c791c79a26d104fc1b6e327c Author: Aaron Durbin adurbin@chromium.org Date: Thu Oct 10 20:54:57 2013 -0500
baytrail: add reset support
Bay Trail has the following types of resets it supports: - Soft reset (INIT# to cpu) - write 0x1 to I/O 0x92 - Soft reset (INIT# to cpu)- write 0x4 to I/0 0xcf9 - Cold reset (S0->S5->S0) - write 0xe to I/0 0xcf9 - Warm reset (PMC_PLTRST# assertion) - write 0x6 to I/O 0xcf9 - Global reset (S0->S5->S0 with TXE reset) - write 0x6 or 0xe to 0xcf9 but with ETR[20] set.
While these are documented this support currently provides support for 2nd soft reset as well as cold and warm reset.
BUG=chrome-os-partner:23249 BRANCH=None TEST=Built and booted.
Change-Id: I9746e7c8aed0ffc29e7afa137798e38c5da9c888 Signed-off-by: Aaron Durbin adurbin@chromium.org Reviewed-on: https://chromium-review.googlesource.com/172710 Reviewed-by: Shawn Nematbakhsh shawnn@chromium.org --- src/soc/intel/baytrail/Kconfig | 1 + src/soc/intel/baytrail/Makefile.inc | 2 ++ src/soc/intel/baytrail/baytrail/pmc.h | 12 +++++++++ src/soc/intel/baytrail/baytrail/reset.h | 36 +++++++++++++++++++++++++ src/soc/intel/baytrail/reset.c | 47 +++++++++++++++++++++++++++++++++ 5 files changed, 98 insertions(+)
diff --git a/src/soc/intel/baytrail/Kconfig b/src/soc/intel/baytrail/Kconfig index 1a7851a..2431802 100644 --- a/src/soc/intel/baytrail/Kconfig +++ b/src/soc/intel/baytrail/Kconfig @@ -15,6 +15,7 @@ config CPU_SPECIFIC_OPTIONS select CPU_MICROCODE_IN_CBFS select DYNAMIC_CBMEM select HAVE_SMI_HANDLER + select HAVE_HARD_RESET select MMCONF_SUPPORT select MMCONF_SUPPORT_DEFAULT select RELOCATABLE_MODULES diff --git a/src/soc/intel/baytrail/Makefile.inc b/src/soc/intel/baytrail/Makefile.inc index 4707d2b..2cae746 100644 --- a/src/soc/intel/baytrail/Makefile.inc +++ b/src/soc/intel/baytrail/Makefile.inc @@ -20,6 +20,8 @@ romstage-y += iosf.c ramstage-y += northcluster.c ramstage-y += ramstage.c ramstage-y += gpio.c +romstage-y += reset.c +ramstage-y += reset.c
# Remove as ramstage gets fleshed out ramstage-y += placeholders.c diff --git a/src/soc/intel/baytrail/baytrail/pmc.h b/src/soc/intel/baytrail/baytrail/pmc.h index 2cf1f00..b85800a 100644 --- a/src/soc/intel/baytrail/baytrail/pmc.h +++ b/src/soc/intel/baytrail/baytrail/pmc.h @@ -26,6 +26,12 @@ /* Memory mapped IO registers behind PMC_BASE_ADDRESS */ #define GEN_PMCONF1 0x20 # define UART_EN (1 << 24) +#define ETR 0x48 +# define CF9LOCK (1 << 31) +# define LTR_DEF (1 << 22) +# define IGNORE_HPET (1 << 21) +# define CF9GR (1 << 20) +# define CWORWRE (1 << 18)
/* IO Mapped registers behind ACPI_BASE_ADDRESS */ #define TCO_RLD 0x60 @@ -37,4 +43,10 @@ # define TCO_TMR_HALT (1 << 11) #define TCO_TMR 0x70
+/* I/O ports */ +#define RST_CNT 0xcf9 +# define FULL_RST (1 << 3) +# define RST_CPU (1 << 2) +# define SYS_RST (1 << 1) + #endif /* _BAYTRAIL_PMC_H_ */ diff --git a/src/soc/intel/baytrail/baytrail/reset.h b/src/soc/intel/baytrail/baytrail/reset.h new file mode 100644 index 0000000..dbf0fd2 --- /dev/null +++ b/src/soc/intel/baytrail/baytrail/reset.h @@ -0,0 +1,36 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2013 Google Inc. + * + * 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; version 2 of the License. + * + * 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 _BAYTRAIL_RESET_H_ +#define _BAYTRAIL_RESET_H_ +#include <reset.h> + +/* Bay Trail has the following types of resets: + * - Soft reset (INIT# to cpu) - write 0x1 to I/O 0x92 + * - Soft reset (INIT# to cpu)- write 0x4 to I/0 0xcf9 + * - Cold reset (S0->S5->S0) - write 0xe to I/0 0xcf9 + * - Warm reset (PMC_PLTRST# assertion) - write 0x6 to I/O 0xcf9 + * - Global reset (S0->S5->S0 with TXE reset) - write 0x6 or 0xe to 0xcf9 but + * with ETR[20] set. + */ + +void cold_reset(void); +void warm_reset(void); + +#endif /* _BAYTRAIL_RESET_H_ */ diff --git a/src/soc/intel/baytrail/reset.c b/src/soc/intel/baytrail/reset.c new file mode 100644 index 0000000..a421ec9 --- /dev/null +++ b/src/soc/intel/baytrail/reset.c @@ -0,0 +1,47 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2013 Google Inc. + * + * 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; version 2 of the License. + * + * 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 + */ + +#include <arch/io.h> +#include <baytrail/pmc.h> +#include <baytrail/reset.h> + +void cold_reset(void) +{ + /* S0->S5->S0 trip. */ + outb(RST_CPU | SYS_RST | FULL_RST, RST_CNT); +} + +void warm_reset(void) +{ + /* PMC_PLTRST# asserted. */ + outb(RST_CPU | SYS_RST, RST_CNT); +} + +void soft_reset(void) +{ + /* Sends INIT# to CPU */ + outb(RST_CPU, RST_CNT); +} + +void hard_reset(void) +{ + /* Don't power cycle on hard_reset(). It's not really clear what the + * semantics should be for the meaning of hard_reset(). */ + warm_reset(); +}