From ddbf2c4af05b5cbd889d6a55e67734c8a041bc66 Mon Sep 17 00:00:00 2001
From: Tim Wawrzynczak <twawrzynczak@chromium.org>
Date: Wed, 15 May 2019 08:42:20 -0600
Subject: [PATCH] soc/intel/cannonlake: Configure SPI CS parameters in FSP UPD.

When FSP UPD parameters are configured, also configure the GSPI CS lines
appropriately.  GSPI driver assumes CS0 is the CS signal to use.

BUG=b:130329260
BRANCH=None
TEST=Boot Kohaku, TPM communcation still functional.

Change-Id: Ic816395b7d198a52c704e6cabcb56889150b741c
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32791
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
---
 src/soc/intel/cannonlake/fsp_params.c | 43 +++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/src/soc/intel/cannonlake/fsp_params.c b/src/soc/intel/cannonlake/fsp_params.c
index cc01d10fe8..dd9388296d 100644
--- a/src/soc/intel/cannonlake/fsp_params.c
+++ b/src/soc/intel/cannonlake/fsp_params.c
@@ -119,6 +119,28 @@ static void ignore_gbe_ltr(void)
 	write8(pmcbase + LTR_IGN, reg8);
 }
 
+static void configure_gspi_cs(int idx, const config_t *config,
+			      uint8_t *polarity, uint8_t *enable,
+			      uint8_t *defaultcs)
+{
+	struct spi_cfg cfg;
+
+	/* If speed_mhz is set, infer that the port should be configured */
+	if (config->common_soc_config.gspi[idx].speed_mhz != 0) {
+		if (gspi_get_soc_spi_cfg(idx, &cfg) == 0) {
+			if (cfg.cs_polarity == SPI_POLARITY_LOW)
+				*polarity = 0;
+			else
+				*polarity = 1;
+
+			if (defaultcs != NULL)
+				*defaultcs = 0;
+			if (enable != NULL)
+				*enable = 1;
+		}
+	}
+}
+
 /* UPD parameters to be initialized before SiliconInit */
 void platform_fsp_silicon_init_params_cb(FSPS_UPD *supd)
 {
@@ -357,6 +379,27 @@ void platform_fsp_silicon_init_params_cb(FSPS_UPD *supd)
 
 	/* Unlock all GPIO pads */
 	tconfig->PchUnlockGpioPads = config->PchUnlockGpioPads;
+
+	/*
+	 * GSPI Chip Select parameters
+	 * The GSPI driver assumes that CS0 is the used chip-select line,
+	 * therefore only CS0 is configured below.
+	 */
+#if CONFIG(SOC_INTEL_COMETLAKE)
+	configure_gspi_cs(0, config, &params->SerialIoSpi0CsPolarity[0],
+			&params->SerialIoSpi0CsEnable[0],
+			&params->SerialIoSpiDefaultCsOutput[0]);
+	configure_gspi_cs(1, config, &params->SerialIoSpi1CsPolarity[0],
+			&params->SerialIoSpi1CsEnable[0],
+			&params->SerialIoSpiDefaultCsOutput[1]);
+	configure_gspi_cs(2, config, &params->SerialIoSpi2CsPolarity[0],
+			&params->SerialIoSpi2CsEnable[0],
+			&params->SerialIoSpiDefaultCsOutput[2]);
+#else
+	for (i = 0; i < CONFIG_SOC_INTEL_COMMON_BLOCK_GSPI_MAX; i++)
+		configure_gspi_cs(i, config,
+				&params->SerialIoSpiCsPolarity[0], NULL, NULL);
+#endif
 }
 
 /* Mainboard GPIO Configuration */