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/* Copyright 2018 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "console.h"
#include "hooks.h"
#include "registers.h"
#define CPRINTS(format, args...) cprints(CC_SYSTEM, format, ## args)
#define CPRINTF(format, args...) cprintf(CC_SYSTEM, format, ## args)
#define AP_TX_TERM (1 << 0)
#define SPS_TERM (1 << 1)
static uint8_t term_enabled;
static void update_term_state(int term, int enable)
{
if (enable)
term_enabled |= term;
else
term_enabled &= ~term;
}
int board_s3_term_is_enabled(void)
{
return term_enabled;
}
static void ap_tx_term_enable(int term_enable)
{
/* Add a pulldown to AP TX Cr50 RX */
GWRITE_FIELD(PINMUX, DIOA3_CTL, PD, term_enable);
update_term_state(AP_TX_TERM, term_enable);
}
static void sps_enable_pd(int term_enable)
{
GWRITE_FIELD(PINMUX, DIOA2_CTL, PD, term_enable); /* SPS_MOSI */
GWRITE_FIELD(PINMUX, DIOA6_CTL, PD, term_enable); /* SPS_CLK */
GWRITE_FIELD(PINMUX, DIOA10_CTL, PD, term_enable); /* SPS_MISO */
GWRITE_FIELD(PINMUX, DIOA12_CTL, PD, term_enable); /* SPS_CS_L */
}
static void sps_enable_inputs(int input_enable)
{
GWRITE_FIELD(PINMUX, DIOA2_CTL, IE, input_enable); /* SPS_MOSI */
GWRITE_FIELD(PINMUX, DIOA6_CTL, IE, input_enable); /* SPS_CLK */
GWRITE_FIELD(PINMUX, DIOA10_CTL, IE, 0); /* SPS_MISO */
GWRITE_FIELD(PINMUX, DIOA12_CTL, IE, input_enable); /* SPS_CS_L */
}
static void sps_term_enable(int term_enable)
{
/* Disable the sps inputs before enabling the pulldowns */
if (!term_enable)
sps_enable_inputs(!term_enable);
/* Control the pulldowns on the SPS signals */
sps_enable_pd(term_enable);
/* Reenable the sps inputs after enabling the pulldowns */
if (term_enable)
sps_enable_inputs(!term_enable);
update_term_state(SPS_TERM, term_enable);
}
static void s3_term(int term_enable)
{
/* If the board doesn't use s3_term, return before doing anything */
if (!board_needs_s3_term())
return;
CPRINTS("%sable S3 signal terminations", term_enable ? "En" : "Dis");
ap_tx_term_enable(term_enable);
if (!board_tpm_uses_i2c())
sps_term_enable(term_enable);
}
/*
* Disable all terminations after cr50 reset. CCD state will re-enable them if
* needed. We just want to make sure any terminations enabled from the previous
* boot don't interfere with any other peripheral initialization. The pins
* s3_term controls may not be covered by the standard gpio init, so they won't
* be reset unless s3_term resets them during init.
*/
static void s3_term_init(void)
{
s3_term(0);
}
DECLARE_HOOK(HOOK_INIT, s3_term_init, HOOK_PRIO_FIRST);
void board_s3_term(int term_enable)
{
/* Only update the terminations if something has changed */
if (!term_enable == !term_enabled)
return;
s3_term(term_enable);
}
static int command_s3term(int argc, char **argv)
{
ccprintf("Terminations:%s%s%s\n",
term_enabled ? "" : "None",
term_enabled & AP_TX_TERM ? " AP" : "",
term_enabled & SPS_TERM ? " SPS" : "");
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(s3term, command_s3term, "",
"Get the state of the S3 termination signals");
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