soc/intel/common/block/fast_spi: Add SPI Vendor Component Lock

Add fast_spi_set_vcl() to be called by the SOC lockdown function if SPI
Vendor Specific Component Capabilities are desired.

Change-Id: I6d9b58e90fa16c539b90c6b961862e97e1bf29a2
Signed-off-by: Marc Jones <marcjones@sysproconsulting.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/72478
Reviewed-by: David Hendricks <david.hendricks@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/common/block/fast_spi/fast_spi.c

@@ -464,6 +464,17 @@ void fast_spi_set_bde(void)
 	pci_or_config32(dev, SPI_BIOS_DECODE_EN, SPI_BIOS_DECODE_LOCK);
 }
 
+/* Set FAST_SPIBAR + SPIBAR_SFDP0_VSCC0 (0xc4) Vendor Control Lock */
+void fast_spi_set_vcl(void)
+{
+	void *spibar = fast_spi_get_bar();
+	uint32_t vcss;
+
+	vcss = read32(spibar + SPIBAR_SFDP0_VSCC0);
+	vcss |= SPIBAR_SFDP0_VSCC0_VCL;
+	write32(spibar + SPIBAR_SFDP0_VSCC0, vcss);
+}
+
 void fast_spi_clear_outstanding_status(void)
 {
 	void *spibar = fast_spi_get_bar();

src/soc/intel/common/block/fast_spi/fast_spi_def.h

@@ -39,6 +39,7 @@
 #define SPIBAR_OPMENU_UPPER		0xac
 #define SPIBAR_FDOC			0xb4
 #define SPIBAR_FDOD			0xb8
+#define SPIBAR_SFDP0_VSCC0		0xc4
 #define SPIBAR_PTINX			0xcc
 #define SPIBAR_PTDATA			0xd0
 
@@ -133,6 +134,12 @@
 		    (SPI_OPTYPE_1 << 2) | (SPI_OPTYPE_0))
 #define SPI_OPPREFIX ((0x50 << 8) | 0x06) /* EWSR and WREN */
 
+/*
+ * Spi Flash Vendor Specific Component Capabilities
+ * for Component 0 (0xc4) register
+ */
+#define SPIBAR_SFDP0_VSCC0_VCL		(1 << 30)
+
 /*
  * Register Offset of BIOS Vendor Specific Component Capabilities (VSCC)
  * for Component 0 Register

src/soc/intel/common/block/include/intelblocks/fast_spi.h

@@ -107,5 +107,9 @@ void fast_spi_cache_ext_bios_postcar(struct postcar_frame *pcf);
  * Set FAST_SPIBAR BIOS Decode Lock bit
  */
 void fast_spi_set_bde(void);
+/*
+ * Set FAST_SPIBAR Vendor Component Lock bit.
+ */
+void fast_spi_set_vcl(void);
 
 #endif	/* SOC_INTEL_COMMON_BLOCK_FAST_SPI_H */