soc/intel/quark: Add legacy SPI flash controller driver

Add SPI driver code for the legacy SPI flash controller.  Enable erase
and write support allowing coreboot to save non-volatile data into
the SPI flash.

TEST=Build and run on Galileo Gen2.

Change-Id: I8f38c955d7c42a1e58728c728d0cecc36556de5c
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
Reviewed-on: https://review.coreboot.org/20231
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

src/soc/intel/quark/include/soc/pci_devs.h

@@ -28,6 +28,7 @@
 #define I2CGPIO_DEVID		0x0934
 #define HSUART_DEVID		0x0936
 #define EHCI_DEVID		0x0939
+#define LPC_DEVID		0X095E
 #define PCIE_PORT0_DEVID	0x11c3
 #define PCIE_PORT1_DEVID	0x11c4
 

src/soc/intel/quark/include/soc/spi.h

@@ -0,0 +1,96 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 Intel Corporation.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2 of
+ * the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __SOC_SPI_H__
+#define __SOC_SPI_H__
+
+#include <spi_flash.h>
+#include <spi-generic.h>
+
+#define SPISTS		0x3020 /* Status register */
+#define SPICTL		0x3022 /* Control register */
+#define SPIADDR		0x3024 /* Flash chip select and 24-bit address */
+#define SPIDATA		0x3028 /* 64-byte send/receive data buffer */
+#define SPIBBAR		0x3070 /* BIOS base address */
+#define SPIPREOP	0x3074 /* Prefix opcode table */
+#define SPITYPE		0x3076 /* Opcode type table */
+#define SPIOPMENU	0x3078 /* Opcode table */
+#define SPIPBR0		0x3080 /* Protected BIOS range */
+#define SPIPBR1		0x3084
+#define SPIPBR2		0x3088
+
+struct flash_ctrlr {
+	uint8_t rsvd_0x00[0x3020];/* 0x00 */
+	uint16_t status;	  /* 0x3020: Status register */
+	uint16_t control;	  /* 0x3022: Control register */
+	uint32_t address;	  /* 0x3024: Chip select and 24-bit address */
+	uint8_t data[64];	  /* 0x3028: 64-byte send/receive data buffer */
+	uint8_t rsvd_0x68[8];	  /* 0x3068 */
+	uint32_t bbar;		  /* 0x3070: BIOS base address */
+	uint8_t prefix[2];	  /* 0x3074: Prefix opcode table */
+	uint16_t type;		  /* 0x3076: Opcode type table */
+	uint8_t opmenu[8];	  /* 0x3078: Opcode table */
+	uint32_t pbr[3];	  /* 0x3080: Protected BIOS range */
+};
+
+/* 0x3020: SPISTS */
+#define SPISTS_CLD		0x8000 /* Lock SPI controller configuration */
+#define SPISTS_BA		0x0008 /* Access is blocked */
+#define SPISTS_CD		0x0004 /* Cycle done */
+#define SPISTS_CIP		0x0001 /* Cycle in progress */
+
+/* 0x3022: SPICTL */
+#define SPICTL_SMIEN		0x8000 /* Assert SMI_B at cycle done */
+#define SPICTL_DC		0x4000 /* Cycle contains data */
+#define SPICTL_DBCNT		0x3f00 /* Data byte count - 1, 1 - 64 bytes */
+#define SPICTL_DBCNT_SHIFT	8
+#define SPICTL_COPTR		0x0070 /* Opcode menu index, 0 - 7 */
+#define SPICTL_COPTR_SHIFT	4
+#define SPICTL_SOPTR		0x0008 /* Prefix index, 0 - 1 */
+#define SPICTL_SOPTR_SHIFT	3
+#define SPICTL_ACS		0x0004 /* Atomic cycle sequence */
+#define SPICTL_CG		0x0002 /* Cycle go */
+#define SPICTL_AR		0x0001 /* Access request */
+
+/* 0x3076: SPITYPE */
+#define SPITYPE_ADDRESS		0x0002 /* 3-byte address required */
+#define SPITYPE_PREFIX		0x0001 /* Prefix required, write/erase cycle */
+
+/*
+ * 0x3080: PBR0
+ * 0x3084: PBR1
+ * 0x3088: PBR2
+ */
+#define SPIPBR_WPE		0x80000000 /* Write protect enable */
+#define SPIPBR_PRL		0x00fff000 /* Protected range limit */
+#define SPIPBR_PRB_SHIFT	12
+#define SPIPBR_PRB		0x00000fff /* Protected range base */
+
+struct spi_context {
+	volatile struct flash_ctrlr *ctrlr;
+	uint16_t control;
+	uint16_t prefix;
+};
+
+extern const struct spi_ctrlr spi_driver;
+
+void spi_bios_base(uint32_t bios_base_address);
+void spi_controller_lock(void);
+void spi_display(volatile struct flash_ctrlr *ctrlr);
+const char *spi_opcode_name(int opcode);
+int spi_protection(uint32_t address, uint32_t length);
+
+#endif /* __SOC_SPI_H__ */