x86: crownbay: Add SPI flash support

The Crown Bay board has an SST25VF016B flash connected to the Tunnel
Creek processor SPI controller used as the BIOS media where U-Boot
is stored. Enable this flash support.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>

arch/x86/cpu/queensbay/tnc.c

@@ -6,18 +6,42 @@
 
 #include <common.h>
 #include <asm/io.h>
+#include <asm/pci.h>
 #include <asm/post.h>
+#include <asm/arch/tnc.h>
 #include <asm/arch/fsp/fsp_support.h>
 #include <asm/processor.h>
 
+static void unprotect_spi_flash(void)
+{
+	u32 bc;
+
+	bc = pci_read_config32(PCH_LPC_DEV, 0xd8);
+	bc |= 0x1;	/* unprotect the flash */
+	pci_write_config32(PCH_LPC_DEV, 0xd8, bc);
+}
+
 int arch_cpu_init(void)
 {
+	struct pci_controller *hose;
+	int ret;
+
 	post_code(POST_CPU_INIT);
 #ifdef CONFIG_SYS_X86_TSC_TIMER
 	timer_set_base(rdtsc());
 #endif
 
-	return x86_cpu_init_f();
+	ret = x86_cpu_init_f();
+	if (ret)
+		return ret;
+
+	ret = pci_early_init_hose(&hose);
+	if (ret)
+		return ret;
+
+	unprotect_spi_flash();
+
+	return 0;
 }
 
 int print_cpuinfo(void)

arch/x86/include/asm/arch-queensbay/tnc.h

+/*
+ * Copyright (C) 2014, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _X86_ARCH_TNC_H_
+#define _X86_ARCH_TNC_H_
+
+#include <pci.h>
+
+/* PCI Configuration Space (D31:F0): LPC */
+#define PCH_LPC_DEV	PCI_BDF(0, 0x1f, 0)
+
+#endif /* _X86_ARCH_TNC_H_ */

include/configs/crownbay.h

@@ -45,6 +45,8 @@
 #define CONFIG_SCSI_DEV_LIST            \
 	{PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_TCF_SATA}
 
+#define CONFIG_SPI_FLASH_SST
+
 /* Video is not supported */
 #undef CONFIG_VIDEO
 #undef CONFIG_CFB_CONSOLE