arm: socfpga: sr1500: Misc updates (SPI speed, env location)

This patch makes the following changes to the SR1500 board port:

- Update defconfig to support SPI NOR (use make savedefconfig).
- Increase SPI speed to a maximum of 100MHz for faster system
  bootup.
- Change environment location, so that its not between SPL and
  main U-Boot. This way the combined SPL / U-Boot image can
  be used for updates.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Marek Vasut <marex@denx.de>

arch/arm/dts/socfpga_cyclone5_sr1500.dts

@@ -88,7 +88,7 @@
 		#size-cells = <1>;
 		compatible = "n25q00", "spi-flash";
 		reg = <0>;      /* chip select */
-		spi-max-frequency = <50000000>;
+		spi-max-frequency = <100000000>;
 		m25p,fast-read;
 		page-size = <256>;
 		block-size = <16>; /* 2^16, 64KB */

configs/socfpga_sr1500_defconfig

@@ -15,7 +15,9 @@ CONFIG_SPL_DM_SEQ_ALIAS=y
 CONFIG_DWAPB_GPIO=y
 CONFIG_DM_MMC=y
 CONFIG_SPI_FLASH=y
+CONFIG_SPI_FLASH_STMICRO=y
 # CONFIG_SPI_FLASH_USE_4K_SECTORS is not set
 CONFIG_DM_ETH=y
 CONFIG_ETH_DESIGNWARE=y
 CONFIG_SYS_NS16550=y
+CONFIG_CADENCE_QSPI=y

include/configs/socfpga_sr1500.h

@@ -93,22 +93,27 @@
 #define CONFIG_SYS_BOOTCOUNT_BE
 
 /* Environment setting for SPI flash */
-#undef CONFIG_ENV_SIZE
 #define CONFIG_SYS_REDUNDAND_ENVIRONMENT
 #define CONFIG_ENV_SECT_SIZE	(64 * 1024)
 #define CONFIG_ENV_SIZE		(16 * 1024)
-#define CONFIG_ENV_OFFSET	0x00040000
+#define CONFIG_ENV_OFFSET	0x000e0000
 #define CONFIG_ENV_OFFSET_REDUND (CONFIG_ENV_OFFSET + CONFIG_ENV_SECT_SIZE)
 #define CONFIG_ENV_SPI_BUS	0
 #define CONFIG_ENV_SPI_CS	0
 #define CONFIG_ENV_SPI_MODE	SPI_MODE_3
-#define CONFIG_ENV_SPI_MAX_HZ	CONFIG_SF_DEFAULT_SPEED
+#define CONFIG_ENV_SPI_MAX_HZ	100000000	/* Use max of 100MHz */
+#define CONFIG_SF_DEFAULT_SPEED	100000000
+
+/*
+ * The QSPI NOR flash layout on SR1500:
+ *
+ * 0000.0000 - 0003.ffff: SPL (4 times)
+ * 0004.0000 - 000d.ffff: U-Boot
+ * 000e.0000 - 000e.ffff: env1
+ * 000f.0000 - 000f.ffff: env2
+ */
 
 /* The rest of the configuration is shared */
 #include <configs/socfpga_common.h>
 
-/* U-Boot payload is stored at offset 0x60000 */
-#undef CONFIG_SYS_SPI_U_BOOT_OFFS
-#define CONFIG_SYS_SPI_U_BOOT_OFFS	0x60000
-
 #endif	/* __CONFIG_SOCFPGA_SR1500_H__ */