diff options
| author | Subrata Banik <subrata.banik@intel.com> | 2018-02-26 14:49:00 +0530 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2018-03-09 21:40:32 +0000 |
| commit | efbfdd2d60043b75d87f4149f28eceafa19643d8 (patch) | |
| tree | dff39e2cfd8e905f343d1d1f4e64e16c2526aac7 /src/soc/intel/skylake/bootblock | |
| parent | d83faceefa77e9a769a7e6de4ad5313d5afc422a (diff) | |
soc/intel/skylake: Move PCR DMI programming into bootblock
As per PCH BWG 2.5.16, set up LPC IO Enables PCR[DMI] + 2774h bit
[15:0] to the same value program in LPC PCI offset 82h. Also this
cycle decoding is only allowed to set when SRLOCK is not set.
Hence move the required programming from lpc.c to pch.c.
Also only enable COM port ranges if CONFIG_DRIVERS_UART_8250IO
Kconfig is selected.
Change-Id: Ie706735492a450baa653d8a8bb74c6e42f5150b8
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/23866
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'src/soc/intel/skylake/bootblock')
| -rw-r--r-- | src/soc/intel/skylake/bootblock/pch.c | 33 |
1 files changed, 30 insertions, 3 deletions
diff --git a/src/soc/intel/skylake/bootblock/pch.c b/src/soc/intel/skylake/bootblock/pch.c index 34cfaa34e8..521a1b736a 100644 --- a/src/soc/intel/skylake/bootblock/pch.c +++ b/src/soc/intel/skylake/bootblock/pch.c @@ -36,6 +36,8 @@ #include <soc/pmc.h> #include <soc/smbus.h> +#define PCR_DMI_DMICTL 0x2234 +#define PCR_DMI_DMICTL_SRLOCK (1 << 31) #define PCR_DMI_ACPIBA 0x27B4 #define PCR_DMI_ACPIBDID 0x27B8 #define PCR_DMI_PMBASEA 0x27AC @@ -158,14 +160,39 @@ static void soc_config_tco(void) outw(tcocnt, tcobase + TCO1_CNT); } +static int pch_check_decode_enable(void) +{ + uint32_t dmi_control; + + /* + * This cycle decoding is only allowed to set when + * DMICTL.SRLOCK is 0. + */ + dmi_control = pcr_read32(PID_DMI, PCR_DMI_DMICTL); + if (dmi_control & PCR_DMI_DMICTL_SRLOCK) + return -1; + return 0; +} + void pch_early_iorange_init(void) { + uint16_t io_enables = LPC_IOE_SUPERIO_2E_2F | LPC_IOE_KBC_60_64 | + LPC_IOE_EC_62_66; + /* IO Decode Range */ - lpc_io_setup_comm_a_b(); + if (IS_ENABLED(CONFIG_DRIVERS_UART_8250IO)) + lpc_io_setup_comm_a_b(); /* IO Decode Enable */ - lpc_enable_fixed_io_ranges(LPC_IOE_SUPERIO_2E_2F | LPC_IOE_KBC_60_64 | - LPC_IOE_EC_62_66); + if (pch_check_decode_enable() == 0) { + io_enables = lpc_enable_fixed_io_ranges(io_enables); + /* + * As per PCH BWG 2.5.16. + * Set up LPC IO Enables PCR[DMI] + 2774h [15:0] to the same + * value program in LPC PCI offset 82h. + */ + pcr_write16(PID_DMI, PCR_DMI_LPCIOE, io_enables); + } /* Program generic IO Decode Range */ pch_enable_lpc(); |