arm: armada-xp: Add basic support for Marvell Armada XP SoC

This basic support for the Marvell Armada XP is base on the existing kirkwood
support. Which has been generatized by moving some common files into
common marvell locations.

This is in preparation for the upcoming Armada XP MV78460 support.

Signed-off-by: Stefan Roese <sr@denx.de>
Tested-by: Luka Perkov <luka@openwrt.org>

2 files changed, 200 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv7/armada-xp/Makefile b/arch/arm/cpu/armv7/armada-xp/Makefile
new file mode 100644
index 0000000000..885dcee2e1
--- /dev/null
+++ b/arch/arm/cpu/armv7/armada-xp/Makefile
@@ -0,0 +1,7 @@
+#
+# Copyright (C) 2014 Stefan Roese <sr@denx.de>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-y	= cpu.o
diff --git a/arch/arm/cpu/armv7/armada-xp/cpu.c b/arch/arm/cpu/armv7/armada-xp/cpu.c
new file mode 100644
index 0000000000..1cf70a9f5d
--- /dev/null
+++ b/arch/arm/cpu/armv7/armada-xp/cpu.c
@@ -0,0 +1,193 @@
+/*
+ * Copyright (C) 2014 Stefan Roese <sr@denx.de>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <netdev.h>
+#include <asm/io.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/soc.h>
+
+#define DDR_BASE_CS_OFF(n)	(0x0000 + ((n) << 3))
+#define DDR_SIZE_CS_OFF(n)	(0x0004 + ((n) << 3))
+
+static struct mbus_win windows[] = {
+	/* PCIE MEM address space */
+	{ DEFADR_PCI_MEM, 256 << 20, CPU_TARGET_PCIE13, CPU_ATTR_PCIE_MEM },
+
+	/* PCIE IO address space */
+	{ DEFADR_PCI_IO, 64 << 10, CPU_TARGET_PCIE13, CPU_ATTR_PCIE_IO },
+
+	/* SPI */
+	{ DEFADR_SPIF, 8 << 20, CPU_TARGET_DEVICEBUS_BOOTROM_SPI,
+	  CPU_ATTR_SPIFLASH },
+
+	/* NOR */
+	{ DEFADR_BOOTROM, 8 << 20, CPU_TARGET_DEVICEBUS_BOOTROM_SPI,
+	  CPU_ATTR_BOOTROM },
+};
+
+void reset_cpu(unsigned long ignored)
+{
+	struct mvebu_system_registers *reg =
+		(struct mvebu_system_registers *)MVEBU_SYSTEM_REG_BASE;
+
+	writel(readl(&reg->rstoutn_mask) | 1, &reg->rstoutn_mask);
+	writel(readl(&reg->sys_soft_rst) | 1, &reg->sys_soft_rst);
+	while (1)
+		;
+}
+
+#if defined(CONFIG_DISPLAY_CPUINFO)
+int print_cpuinfo(void)
+{
+	u16 devid = (readl(MVEBU_REG_PCIE_DEVID) >> 16) & 0xffff;
+	u8 revid = readl(MVEBU_REG_PCIE_REVID) & 0xff;
+
+	puts("SoC:   ");
+
+	switch (devid) {
+	case SOC_MV78460_ID:
+		puts("MV78460-");
+		break;
+	default:
+		puts("Unknown-");
+		break;
+	}
+
+	switch (revid) {
+	case 1:
+		puts("A0\n");
+		break;
+	case 2:
+		puts("B0\n");
+		break;
+	default:
+		puts("??\n");
+		break;
+	}
+
+	return 0;
+}
+#endif /* CONFIG_DISPLAY_CPUINFO */
+
+/*
+ * This function initialize Controller DRAM Fastpath windows.
+ * It takes the CS size information from the 0x1500 scratch registers
+ * and sets the correct windows sizes and base addresses accordingly.
+ *
+ * These values are set in the scratch registers by the Marvell
+ * DDR3 training code, which is executed by the BootROM before the
+ * main payload (U-Boot) is executed. This training code is currently
+ * only available in the Marvell U-Boot version. It needs to be
+ * ported to mainline U-Boot SPL at some point.
+ */
+static void update_sdram_window_sizes(void)
+{
+	u64 base = 0;
+	u32 size, temp;
+	int i;
+
+	for (i = 0; i < SDRAM_MAX_CS; i++) {
+		size = readl((MVEBU_SDRAM_SCRATCH + (i * 8))) & SDRAM_ADDR_MASK;
+		if (size != 0) {
+			size |= ~(SDRAM_ADDR_MASK);
+
+			/* Set Base Address */
+			temp = (base & 0xFF000000ll) | ((base >> 32) & 0xF);
+			writel(temp, MVEBU_SDRAM_BASE + DDR_BASE_CS_OFF(i));
+
+			/*
+			 * Check if out of max window size and resize
+			 * the window
+			 */
+			temp = (readl(MVEBU_SDRAM_BASE + DDR_SIZE_CS_OFF(i)) &
+				~(SDRAM_ADDR_MASK)) | 1;
+			temp |= (size & SDRAM_ADDR_MASK);
+			writel(temp, MVEBU_SDRAM_BASE + DDR_SIZE_CS_OFF(i));
+
+			base += ((u64)size + 1);
+		} else {
+			/*
+			 * Disable window if not used, otherwise this
+			 * leads to overlapping enabled windows with
+			 * pretty strange results
+			 */
+			clrbits_le32(MVEBU_SDRAM_BASE + DDR_SIZE_CS_OFF(i), 1);
+		}
+	}
+}
+
+#ifdef CONFIG_ARCH_CPU_INIT
+int arch_cpu_init(void)
+{
+	/* Linux expects the internal registers to be at 0xf1000000 */
+	writel(SOC_REGS_PHY_BASE, INTREG_BASE_ADDR_REG);
+
+	/*
+	 * We need to call mvebu_mbus_probe() before calling
+	 * update_sdram_window_sizes() as it disables all previously
+	 * configured mbus windows and then configures them as
+	 * required for U-Boot. Calling update_sdram_window_sizes()
+	 * without this configuration will not work, as the internal
+	 * registers can't be accessed reliably because of potenial
+	 * double mapping.
+	 * After updating the SDRAM access windows we need to call
+	 * mvebu_mbus_probe() again, as this now correctly configures
+	 * the SDRAM areas that are later used by the MVEBU drivers
+	 * (e.g. USB, NETA).
+	 */
+
+	/*
+	 * First disable all windows
+	 */
+	mvebu_mbus_probe(NULL, 0);
+
+	/*
+	 * Now the SDRAM access windows can be reconfigured using
+	 * the information in the SDRAM scratch pad registers
+	 */
+	update_sdram_window_sizes();
+
+	/*
+	 * Finally the mbus windows can be configured with the
+	 * updated SDRAM sizes
+	 */
+	mvebu_mbus_probe(windows, ARRAY_SIZE(windows));
+
+	return 0;
+}
+#endif /* CONFIG_ARCH_CPU_INIT */
+
+/*
+ * SOC specific misc init
+ */
+#if defined(CONFIG_ARCH_MISC_INIT)
+int arch_misc_init(void)
+{
+	/* Nothing yet, perhaps we need something here later */
+	return 0;
+}
+#endif /* CONFIG_ARCH_MISC_INIT */
+
+#ifdef CONFIG_MVNETA
+int cpu_eth_init(bd_t *bis)
+{
+	mvneta_initialize(bis, MVEBU_EGIGA0_BASE, 0, CONFIG_PHY_BASE_ADDR + 0);
+	mvneta_initialize(bis, MVEBU_EGIGA1_BASE, 1, CONFIG_PHY_BASE_ADDR + 1);
+	mvneta_initialize(bis, MVEBU_EGIGA2_BASE, 2, CONFIG_PHY_BASE_ADDR + 2);
+	mvneta_initialize(bis, MVEBU_EGIGA3_BASE, 3, CONFIG_PHY_BASE_ADDR + 3);
+
+	return 0;
+}
+#endif
+
+#ifndef CONFIG_SYS_DCACHE_OFF
+void enable_caches(void)
+{
+	/* Enable D-cache. I-cache is already enabled in start.S */
+	dcache_enable();
+}
+#endif