arm: ls102xa: Add Freescale LS102xA SoC support

The QorIQ LS1 family is built on Layerscape architecture,
the industry's first software-aware, core-agnostic networking
architecture to offer unprecedented efficiency and scale.

Freescale LS102xA is a set of SoCs combines two ARM
Cortex-A7 cores that have been optimized for high
reliability and pack the highest level of integration
available for sub-3 W embedded communications processors
with Layerscape architecture and with a comprehensive
enablement model focused on ease of programmability.

Signed-off-by: Alison Wang <alison.wang@freescale.com>
Signed-off-by: Jason Jin <jason.jin@freescale.com>
Signed-off-by: Jingchang Lu <jingchang.lu@freescale.com>
Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>

8 files changed, 681 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv7/ls102xa/Makefile b/arch/arm/cpu/armv7/ls102xa/Makefile
new file mode 100644
index 0000000..d82ce8d
--- /dev/null
+++ b/arch/arm/cpu/armv7/ls102xa/Makefile
@@ -0,0 +1,12 @@
+#
+# Copyright 2014 Freescale Semiconductor, Inc.
+#
+# SPDX-License-Identifier:      GPL-2.0+
+#
+
+obj-y	+= cpu.o
+obj-y	+= clock.o
+obj-y	+= timer.o
+
+obj-$(CONFIG_OF_LIBFDT) += fdt.o
+obj-$(CONFIG_SYS_HAS_SERDES) += fsl_ls1_serdes.o ls102xa_serdes.o
diff --git a/arch/arm/cpu/armv7/ls102xa/clock.c b/arch/arm/cpu/armv7/ls102xa/clock.c
new file mode 100644
index 0000000..8f80c61
--- /dev/null
+++ b/arch/arm/cpu/armv7/ls102xa/clock.c
@@ -0,0 +1,130 @@
+/*
+ * Copyright 2014 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/immap_ls102xa.h>
+#include <asm/arch/clock.h>
+#include <fsl_ifc.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifndef CONFIG_SYS_FSL_NUM_CC_PLLS
+#define CONFIG_SYS_FSL_NUM_CC_PLLS      2
+#endif
+
+void get_sys_info(struct sys_info *sys_info)
+{
+	struct ccsr_gur __iomem *gur = (void *)(CONFIG_SYS_FSL_GUTS_ADDR);
+#ifdef CONFIG_FSL_IFC
+	struct fsl_ifc *ifc_regs = (void *)CONFIG_SYS_IFC_ADDR;
+	u32 ccr;
+#endif
+	struct ccsr_clk *clk = (void *)(CONFIG_SYS_FSL_LS1_CLK_ADDR);
+	unsigned int cpu;
+	const u8 core_cplx_pll[6] = {
+		[0] = 0,	/* CC1 PPL / 1 */
+		[1] = 0,	/* CC1 PPL / 2 */
+		[4] = 1,	/* CC2 PPL / 1 */
+		[5] = 1,	/* CC2 PPL / 2 */
+	};
+
+	const u8 core_cplx_pll_div[6] = {
+		[0] = 1,	/* CC1 PPL / 1 */
+		[1] = 2,	/* CC1 PPL / 2 */
+		[4] = 1,	/* CC2 PPL / 1 */
+		[5] = 2,	/* CC2 PPL / 2 */
+	};
+
+	uint i;
+	uint freq_c_pll[CONFIG_SYS_FSL_NUM_CC_PLLS];
+	uint ratio[CONFIG_SYS_FSL_NUM_CC_PLLS];
+	unsigned long sysclk = CONFIG_SYS_CLK_FREQ;
+
+	sys_info->freq_systembus = sysclk;
+#ifdef CONFIG_DDR_CLK_FREQ
+	sys_info->freq_ddrbus = CONFIG_DDR_CLK_FREQ;
+#else
+	sys_info->freq_ddrbus = sysclk;
+#endif
+
+	sys_info->freq_systembus *= (in_be32(&gur->rcwsr[0]) >>
+		RCWSR0_SYS_PLL_RAT_SHIFT) & RCWSR0_SYS_PLL_RAT_MASK;
+	sys_info->freq_ddrbus *= (in_be32(&gur->rcwsr[0]) >>
+		RCWSR0_MEM_PLL_RAT_SHIFT) & RCWSR0_MEM_PLL_RAT_MASK;
+
+	for (i = 0; i < CONFIG_SYS_FSL_NUM_CC_PLLS; i++) {
+		ratio[i] = (in_be32(&clk->pllcgsr[i].pllcngsr) >> 1) & 0x3f;
+		if (ratio[i] > 4)
+			freq_c_pll[i] = sysclk * ratio[i];
+		else
+			freq_c_pll[i] = sys_info->freq_systembus * ratio[i];
+	}
+
+	for (cpu = 0; cpu < CONFIG_MAX_CPUS; cpu++) {
+		u32 c_pll_sel = (in_be32(&clk->clkcsr[cpu].clkcncsr) >> 27)
+				& 0xf;
+		u32 cplx_pll = core_cplx_pll[c_pll_sel];
+
+		sys_info->freq_processor[cpu] =
+			freq_c_pll[cplx_pll] / core_cplx_pll_div[c_pll_sel];
+	}
+
+#if defined(CONFIG_FSL_IFC)
+	ccr = in_be32(&ifc_regs->ifc_ccr);
+	ccr = ((ccr & IFC_CCR_CLK_DIV_MASK) >> IFC_CCR_CLK_DIV_SHIFT) + 1;
+
+	sys_info->freq_localbus = sys_info->freq_systembus / ccr;
+#endif
+}
+
+int get_clocks(void)
+{
+	struct sys_info sys_info;
+
+	get_sys_info(&sys_info);
+	gd->cpu_clk = sys_info.freq_processor[0];
+	gd->bus_clk = sys_info.freq_systembus;
+	gd->mem_clk = sys_info.freq_ddrbus * 2;
+
+#if defined(CONFIG_FSL_ESDHC)
+	gd->arch.sdhc_clk = gd->bus_clk;
+#endif
+
+	return 0;
+}
+
+ulong get_bus_freq(ulong dummy)
+{
+	return gd->bus_clk;
+}
+
+ulong get_ddr_freq(ulong dummy)
+{
+	return gd->mem_clk;
+}
+
+int get_serial_clock(void)
+{
+	return gd->bus_clk / 2;
+}
+
+unsigned int mxc_get_clock(enum mxc_clock clk)
+{
+	switch (clk) {
+	case MXC_I2C_CLK:
+		return get_bus_freq(0) / 2;
+	case MXC_ESDHC_CLK:
+		return get_bus_freq(0);
+	case MXC_DSPI_CLK:
+		return get_bus_freq(0) / 2;
+	case MXC_UART_CLK:
+		return get_bus_freq(0) / 2;
+	default:
+		printf("Unsupported clock\n");
+	}
+	return 0;
+}
diff --git a/arch/arm/cpu/armv7/ls102xa/cpu.c b/arch/arm/cpu/armv7/ls102xa/cpu.c
new file mode 100644
index 0000000..b7dde45
--- /dev/null
+++ b/arch/arm/cpu/armv7/ls102xa/cpu.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright 2014 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/arch/clock.h>
+#include <asm/io.h>
+#include <asm/arch/immap_ls102xa.h>
+#include <tsec.h>
+#include <netdev.h>
+#include <fsl_esdhc.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#if defined(CONFIG_DISPLAY_CPUINFO)
+int print_cpuinfo(void)
+{
+	char buf1[32], buf2[32];
+	struct ccsr_gur __iomem *gur = (void *)(CONFIG_SYS_FSL_GUTS_ADDR);
+	unsigned int svr, major, minor, ver, i;
+
+	svr = in_be32(&gur->svr);
+	major = SVR_MAJ(svr);
+	minor = SVR_MIN(svr);
+
+	puts("CPU:   Freescale LayerScape ");
+
+	ver = SVR_SOC_VER(svr);
+	switch (ver) {
+	case SOC_VER_SLS1020:
+		puts("SLS1020");
+		break;
+	case SOC_VER_LS1020:
+		puts("LS1020");
+		break;
+	case SOC_VER_LS1021:
+		puts("LS1021");
+		break;
+	case SOC_VER_LS1022:
+		puts("LS1022");
+		break;
+	default:
+		puts("Unknown");
+		break;
+	}
+
+	if (IS_E_PROCESSOR(svr) && (ver != SOC_VER_SLS1020))
+		puts("E");
+
+	printf(", Version: %d.%d, (0x%08x)\n", major, minor, svr);
+
+	puts("Clock Configuration:");
+
+	printf("\n       CPU0(ARMV7):%-4s MHz, ", strmhz(buf1, gd->cpu_clk));
+	printf("\n       Bus:%-4s MHz, ", strmhz(buf1, gd->bus_clk));
+	printf("DDR:%-4s MHz (%s MT/s data rate), ",
+	       strmhz(buf1, gd->mem_clk/2), strmhz(buf2, gd->mem_clk));
+	puts("\n");
+
+	/* Display the RCW, so that no one gets confused as to what RCW
+	 * we're actually using for this boot.
+	 */
+	puts("Reset Configuration Word (RCW):");
+	for (i = 0; i < ARRAY_SIZE(gur->rcwsr); i++) {
+		u32 rcw = in_be32(&gur->rcwsr[i]);
+
+		if ((i % 4) == 0)
+			printf("\n       %08x:", i * 4);
+		printf(" %08x", rcw);
+	}
+	puts("\n");
+
+	return 0;
+}
+#endif
+
+void enable_caches(void)
+{
+#ifndef CONFIG_SYS_ICACHE_OFF
+	icache_enable();
+#endif
+#ifndef CONFIG_SYS_DCACHE_OFF
+	dcache_enable();
+#endif
+}
+
+#ifdef CONFIG_FSL_ESDHC
+int cpu_mmc_init(bd_t *bis)
+{
+	return fsl_esdhc_mmc_init(bis);
+}
+#endif
+
+int cpu_eth_init(bd_t *bis)
+{
+#ifdef CONFIG_TSEC_ENET
+	tsec_standard_init(bis);
+#endif
+
+	return 0;
+}
diff --git a/arch/arm/cpu/armv7/ls102xa/fdt.c b/arch/arm/cpu/armv7/ls102xa/fdt.c
new file mode 100644
index 0000000..4ce3808
--- /dev/null
+++ b/arch/arm/cpu/armv7/ls102xa/fdt.c
@@ -0,0 +1,136 @@
+/*
+ * Copyright 2014 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <libfdt.h>
+#include <fdt_support.h>
+#include <asm/io.h>
+#include <asm/processor.h>
+#include <asm/arch/clock.h>
+#include <linux/ctype.h>
+#ifdef CONFIG_FSL_ESDHC
+#include <fsl_esdhc.h>
+#endif
+#include <tsec.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+void ft_fixup_enet_phy_connect_type(void *fdt)
+{
+	struct eth_device *dev;
+	struct tsec_private *priv;
+	const char *enet_path, *phy_path;
+	char enet[16];
+	char phy[16];
+	int phy_node;
+	int i = 0;
+	int enet_id = 0;
+	uint32_t ph;
+
+	while ((dev = eth_get_dev_by_index(i++)) != NULL) {
+		if (strstr(dev->name, "eTSEC1"))
+			enet_id = 0;
+		else if (strstr(dev->name, "eTSEC2"))
+			enet_id = 1;
+		else if (strstr(dev->name, "eTSEC3"))
+			enet_id = 2;
+		else
+			continue;
+
+		priv = dev->priv;
+		if (priv->flags & TSEC_SGMII)
+			continue;
+
+		sprintf(enet, "ethernet%d", enet_id);
+		enet_path = fdt_get_alias(fdt, enet);
+		if (!enet_path)
+			continue;
+
+		sprintf(phy, "enet%d_rgmii_phy", enet_id);
+		phy_path = fdt_get_alias(fdt, phy);
+		if (!phy_path)
+			continue;
+
+		phy_node = fdt_path_offset(fdt, phy_path);
+		if (phy_node < 0)
+			continue;
+
+		ph = fdt_create_phandle(fdt, phy_node);
+		if (ph)
+			do_fixup_by_path_u32(fdt, enet_path,
+					     "phy-handle", ph, 1);
+
+		do_fixup_by_path(fdt, enet_path, "phy-connection-type",
+				 phy_string_for_interface(
+				 PHY_INTERFACE_MODE_RGMII_ID),
+				 sizeof(phy_string_for_interface(
+				 PHY_INTERFACE_MODE_RGMII_ID)),
+				 1);
+	}
+}
+
+void ft_cpu_setup(void *blob, bd_t *bd)
+{
+	int off;
+	int val;
+	const char *sysclk_path;
+
+	unsigned long busclk = get_bus_freq(0);
+
+	fdt_fixup_ethernet(blob);
+
+	off = fdt_node_offset_by_prop_value(blob, -1, "device_type", "cpu", 4);
+	while (off != -FDT_ERR_NOTFOUND) {
+		val = gd->cpu_clk;
+		fdt_setprop(blob, off, "clock-frequency", &val, 4);
+		off = fdt_node_offset_by_prop_value(blob, off,
+						    "device_type", "cpu", 4);
+	}
+
+	do_fixup_by_prop_u32(blob, "device_type", "soc",
+			     4, "bus-frequency", busclk / 2, 1);
+
+	ft_fixup_enet_phy_connect_type(blob);
+
+#ifdef CONFIG_SYS_NS16550
+	do_fixup_by_compat_u32(blob, "fsl,16550-FIFO64",
+			       "clock-frequency", CONFIG_SYS_NS16550_CLK, 1);
+#endif
+
+	sysclk_path = fdt_get_alias(blob, "sysclk");
+	if (sysclk_path)
+		do_fixup_by_path_u32(blob, sysclk_path, "clock-frequency",
+				     CONFIG_SYS_CLK_FREQ, 1);
+	do_fixup_by_compat_u32(blob, "fsl,qoriq-sysclk-2.0",
+			       "clock-frequency", CONFIG_SYS_CLK_FREQ, 1);
+
+#if defined(CONFIG_FSL_ESDHC)
+	fdt_fixup_esdhc(blob, bd);
+#endif
+
+	/*
+	 * platform bus clock = system bus clock/2
+	 * Here busclk = system bus clock
+	 * We are using the platform bus clock as 1588 Timer reference
+	 * clock source select
+	 */
+	do_fixup_by_compat_u32(blob, "fsl, gianfar-ptp-timer",
+			       "timer-frequency", busclk / 2, 1);
+
+	/*
+	 * clock-freq should change to clock-frequency and
+	 * flexcan-v1.0 should change to p1010-flexcan respectively
+	 * in the future.
+	 */
+	do_fixup_by_compat_u32(blob, "fsl, flexcan-v1.0",
+			       "clock_freq", busclk / 2, 1);
+
+	do_fixup_by_compat_u32(blob, "fsl, flexcan-v1.0",
+			       "clock-frequency", busclk / 2, 1);
+
+	do_fixup_by_compat_u32(blob, "fsl, ls1021a-flexcan",
+			       "clock-frequency", busclk / 2, 1);
+}
diff --git a/arch/arm/cpu/armv7/ls102xa/fsl_ls1_serdes.c b/arch/arm/cpu/armv7/ls102xa/fsl_ls1_serdes.c
new file mode 100644
index 0000000..9b78acb
--- /dev/null
+++ b/arch/arm/cpu/armv7/ls102xa/fsl_ls1_serdes.c
@@ -0,0 +1,120 @@
+/*
+ * Copyright 2014 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/arch/fsl_serdes.h>
+#include <asm/arch/immap_ls102xa.h>
+#include <asm/errno.h>
+#include <asm/io.h>
+#include "fsl_ls1_serdes.h"
+
+#ifdef CONFIG_SYS_FSL_SRDS_1
+static u64 serdes1_prtcl_map;
+#endif
+#ifdef CONFIG_SYS_FSL_SRDS_2
+static u64 serdes2_prtcl_map;
+#endif
+
+int is_serdes_configured(enum srds_prtcl device)
+{
+	u64 ret = 0;
+
+#ifdef CONFIG_SYS_FSL_SRDS_1
+	ret |= (1ULL << device) & serdes1_prtcl_map;
+#endif
+#ifdef CONFIG_SYS_FSL_SRDS_2
+	ret |= (1ULL << device) & serdes2_prtcl_map;
+#endif
+
+	return !!ret;
+}
+
+int serdes_get_first_lane(u32 sd, enum srds_prtcl device)
+{
+	struct ccsr_gur __iomem *gur = (void *)(CONFIG_SYS_FSL_GUTS_ADDR);
+	u32 cfg = in_be32(&gur->rcwsr[4]);
+	int i;
+
+	switch (sd) {
+#ifdef CONFIG_SYS_FSL_SRDS_1
+	case FSL_SRDS_1:
+		cfg &= RCWSR4_SRDS1_PRTCL_MASK;
+		cfg >>= RCWSR4_SRDS1_PRTCL_SHIFT;
+		break;
+#endif
+#ifdef CONFIG_SYS_FSL_SRDS_2
+	case FSL_SRDS_2:
+		cfg &= RCWSR4_SRDS2_PRTCL_MASK;
+		cfg >>= RCWSR4_SRDS2_PRTCL_SHIFT;
+		break;
+#endif
+	default:
+		printf("invalid SerDes%d\n", sd);
+		break;
+	}
+	/* Is serdes enabled at all? */
+	if (unlikely(cfg == 0))
+		return -ENODEV;
+
+	for (i = 0; i < SRDS_MAX_LANES; i++) {
+		if (serdes_get_prtcl(sd, cfg, i) == device)
+			return i;
+	}
+
+	return -ENODEV;
+}
+
+u64 serdes_init(u32 sd, u32 sd_addr, u32 sd_prctl_mask, u32 sd_prctl_shift)
+{
+	struct ccsr_gur __iomem *gur = (void *)(CONFIG_SYS_FSL_GUTS_ADDR);
+	u64 serdes_prtcl_map = 0;
+	u32 cfg;
+	int lane;
+
+	cfg = in_be32(&gur->rcwsr[4]) & sd_prctl_mask;
+	cfg >>= sd_prctl_shift;
+	printf("Using SERDES%d Protocol: %d (0x%x)\n", sd + 1, cfg, cfg);
+
+	if (!is_serdes_prtcl_valid(sd, cfg))
+		printf("SERDES%d[PRTCL] = 0x%x is not valid\n", sd + 1, cfg);
+
+	for (lane = 0; lane < SRDS_MAX_LANES; lane++) {
+		enum srds_prtcl lane_prtcl = serdes_get_prtcl(sd, cfg, lane);
+
+		serdes_prtcl_map |= (1ULL << lane_prtcl);
+	}
+
+	return serdes_prtcl_map;
+}
+
+void fsl_serdes_init(void)
+{
+#ifdef CONFIG_SYS_FSL_SRDS_1
+	serdes1_prtcl_map = serdes_init(FSL_SRDS_1,
+					CONFIG_SYS_FSL_SERDES_ADDR,
+					RCWSR4_SRDS1_PRTCL_MASK,
+					RCWSR4_SRDS1_PRTCL_SHIFT);
+#endif
+#ifdef CONFIG_SYS_FSL_SRDS_2
+	serdes2_prtcl_map = serdes_init(FSL_SRDS_2,
+					CONFIG_SYS_FSL_SERDES_ADDR +
+					FSL_SRDS_2 * 0x1000,
+					RCWSR4_SRDS2_PRTCL_MASK,
+					RCWSR4_SRDS2_PRTCL_SHIFT);
+#endif
+}
+
+const char *serdes_clock_to_string(u32 clock)
+{
+	switch (clock) {
+	case SRDS_PLLCR0_RFCK_SEL_100:
+		return "100";
+	case SRDS_PLLCR0_RFCK_SEL_125:
+		return "125";
+	default:
+		return "100";
+	}
+}
diff --git a/arch/arm/cpu/armv7/ls102xa/fsl_ls1_serdes.h b/arch/arm/cpu/armv7/ls102xa/fsl_ls1_serdes.h
new file mode 100644
index 0000000..834aa53
--- /dev/null
+++ b/arch/arm/cpu/armv7/ls102xa/fsl_ls1_serdes.h
@@ -0,0 +1,12 @@
+/*
+ * Copyright 2014 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __FSL_LS1_SERDES_H
+#define __FSL_LS1_SERDES_H
+
+int is_serdes_prtcl_valid(int serdes, u32 prtcl);
+int serdes_lane_enabled(int lane);
+#endif /* __FSL_LS1_SERDES_H */
diff --git a/arch/arm/cpu/armv7/ls102xa/ls102xa_serdes.c b/arch/arm/cpu/armv7/ls102xa/ls102xa_serdes.c
new file mode 100644
index 0000000..cc53910
--- /dev/null
+++ b/arch/arm/cpu/armv7/ls102xa/ls102xa_serdes.c
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2014 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/arch/fsl_serdes.h>
+#include <asm/arch/immap_ls102xa.h>
+
+static u8 serdes_cfg_tbl[][SRDS_MAX_LANES] = {
+	[0x00] = {PCIE1, PCIE1, PCIE1, PCIE1},
+	[0x10] = {PCIE1, SATA1, PCIE2, PCIE2},
+	[0x20] = {PCIE1, SGMII_TSEC1, PCIE2, SGMII_TSEC2},
+	[0x30] = {PCIE1, SATA1, SGMII_TSEC1, SGMII_TSEC2},
+	[0x40] = {PCIE1, PCIE1, SATA1, SGMII_TSEC2},
+	[0x50] = {PCIE1, PCIE1, PCIE2, SGMII_TSEC2},
+	[0x60] = {PCIE1, PCIE1, SGMII_TSEC1, SGMII_TSEC2},
+	[0x70] = {PCIE1, SATA1, PCIE2, SGMII_TSEC2},
+	[0x80] = {PCIE2, PCIE2, PCIE2, PCIE2},
+};
+
+enum srds_prtcl serdes_get_prtcl(int serdes, int cfg, int lane)
+{
+	return serdes_cfg_tbl[cfg][lane];
+}
+
+int is_serdes_prtcl_valid(int serdes, u32 prtcl)
+{
+	int i;
+
+	if (prtcl >= ARRAY_SIZE(serdes_cfg_tbl))
+		return 0;
+
+	for (i = 0; i < SRDS_MAX_LANES; i++) {
+		if (serdes_cfg_tbl[prtcl][i] != NONE)
+			return 1;
+	}
+
+	return 0;
+}
diff --git a/arch/arm/cpu/armv7/ls102xa/timer.c b/arch/arm/cpu/armv7/ls102xa/timer.c
new file mode 100644
index 0000000..11b17b2
--- /dev/null
+++ b/arch/arm/cpu/armv7/ls102xa/timer.c
@@ -0,0 +1,127 @@
+/*
+ * Copyright 2014 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <div64.h>
+#include <asm/arch/immap_ls102xa.h>
+#include <asm/arch/clock.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * This function is intended for SHORT delays only.
+ * It will overflow at around 10 seconds @ 400MHz,
+ * or 20 seconds @ 200MHz.
+ */
+unsigned long usec2ticks(unsigned long usec)
+{
+	ulong ticks;
+
+	if (usec < 1000)
+		ticks = ((usec * (get_tbclk()/1000)) + 500) / 1000;
+	else
+		ticks = ((usec / 10) * (get_tbclk() / 100000));
+
+	return ticks;
+}
+
+static inline unsigned long long tick_to_time(unsigned long long tick)
+{
+	unsigned long freq;
+
+	asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (freq));
+
+	tick *= CONFIG_SYS_HZ;
+	do_div(tick, freq);
+
+	return tick;
+}
+
+static inline unsigned long long us_to_tick(unsigned long long usec)
+{
+	unsigned long freq;
+
+	asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (freq));
+
+	usec = usec * freq  + 999999;
+	do_div(usec, 1000000);
+
+	return usec;
+}
+
+int timer_init(void)
+{
+	struct sctr_regs *sctr = (struct sctr_regs *)SCTR_BASE_ADDR;
+	unsigned long ctrl, val, freq;
+
+	/* Enable System Counter */
+	writel(SYS_COUNTER_CTRL_ENABLE, &sctr->cntcr);
+
+	freq = GENERIC_TIMER_CLK;
+	asm("mcr p15, 0, %0, c14, c0, 0" : : "r" (freq));
+
+	/* Set PL1 Physical Timer Ctrl */
+	ctrl = ARCH_TIMER_CTRL_ENABLE;
+	asm("mcr p15, 0, %0, c14, c2, 1" : : "r" (ctrl));
+
+	/* Set PL1 Physical Comp Value */
+	val = TIMER_COMP_VAL;
+	asm("mcrr p15, 2, %Q0, %R0, c14" : : "r" (val));
+
+	gd->arch.tbl = 0;
+	gd->arch.tbu = 0;
+
+	return 0;
+}
+
+unsigned long long get_ticks(void)
+{
+	unsigned long long now;
+
+	asm("mrrc p15, 0, %Q0, %R0, c14" : "=r" (now));
+
+	gd->arch.tbl = (unsigned long)(now & 0xffffffff);
+	gd->arch.tbu = (unsigned long)(now >> 32);
+
+	return now;
+}
+
+unsigned long get_timer_masked(void)
+{
+	return tick_to_time(get_ticks());
+}
+
+unsigned long get_timer(ulong base)
+{
+	return get_timer_masked() - base;
+}
+
+/* delay x useconds and preserve advance timstamp value */
+void __udelay(unsigned long usec)
+{
+	unsigned long long start;
+	unsigned long tmo;
+
+	start = get_ticks();			/* get current timestamp */
+	tmo = us_to_tick(usec);			/* convert usecs to ticks */
+
+	while ((get_ticks() - start) < tmo)
+		;				/* loop till time has passed */
+}
+
+/*
+ * This function is derived from PowerPC code (timebase clock frequency).
+ * On ARM it returns the number of timer ticks per second.
+ */
+unsigned long get_tbclk(void)
+{
+	unsigned long freq;
+
+	asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (freq));
+
+	return freq;
+}