arm: Kirkwood: Basic SOCs support

Kirkwood family controllers are highly integrated SOCs
based on Feroceon-88FR131/Sheeva-88SV131/arm926ejs cpu core.

SOC versions supported:-
1) 88F6281-A0       define CONFIG_KW88F6281_A0
2) 88F6192-A0       define CONFIG_KW88F6192_A0

Other supported features:-
1) get_random_hex() fucntion
2) PCI Express port initialization
3) NS16550 driver support

Contributors:
Yotam Admon <yotam@marvell.com>
Michael Blostein <michaelbl@marvell.com

Reviewed-by: Ronen Shitrit <rshitrit@marvell.com>
Acked-by: Stefan Rose <sr@denx.de>
Signed-off-by: Prafulla Wadaskar <prafulla@marvell.com>

5 files changed, 670 insertions, 0 deletions

diff --git a/cpu/arm926ejs/kirkwood/Makefile b/cpu/arm926ejs/kirkwood/Makefile
new file mode 100644
index 0000000..d73e2104
--- /dev/null
+++ b/cpu/arm926ejs/kirkwood/Makefile
@@ -0,0 +1,49 @@
+#
+# (C) Copyright 2009
+# Marvell Semiconductor <www.marvell.com>
+# Written-by: Prafulla Wadaskar <prafulla@marvell.com>
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# 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; either version 2 of
+# the License, or (at your option) any later version.
+#
+# 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.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+# MA 02110-1301 USA
+#
+
+include $(TOPDIR)/config.mk
+
+LIB	= $(obj)lib$(SOC).a
+
+COBJS-y	= dram.o
+COBJS-y	+= cpu.o
+COBJS-y	+= mpp.o
+COBJS-y	+= timer.o
+
+SRCS	:= $(SOBJS:.o=.S) $(COBJS-y:.o=.c)
+OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS-y))
+
+all:	$(obj).depend $(LIB)
+
+$(LIB):	$(OBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS)
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/cpu/arm926ejs/kirkwood/cpu.c b/cpu/arm926ejs/kirkwood/cpu.c
new file mode 100644
index 0000000..194ba1c
--- /dev/null
+++ b/cpu/arm926ejs/kirkwood/cpu.c
@@ -0,0 +1,315 @@
+/*
+ * (C) Copyright 2009
+ * Marvell Semiconductor <www.marvell.com>
+ * Written-by: Prafulla Wadaskar <prafulla@marvell.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+#include <common.h>
+#include <netdev.h>
+#include <asm/cache.h>
+#include <u-boot/md5.h>
+#include <asm/arch/kirkwood.h>
+
+#define BUFLEN	16
+
+void reset_cpu(unsigned long ignored)
+{
+	struct kwcpu_registers *cpureg =
+	    (struct kwcpu_registers *)KW_CPU_REG_BASE;
+
+	writel(readl(&cpureg->rstoutn_mask) | (1 << 2),
+		&cpureg->rstoutn_mask);
+	writel(readl(&cpureg->sys_soft_rst) | 1,
+		&cpureg->sys_soft_rst);
+	while (1) ;
+}
+
+/*
+ * Generates Ramdom hex number reading some time varient system registers
+ * and using md5 algorithm
+ */
+unsigned char get_random_hex(void)
+{
+	int i;
+	u32 inbuf[BUFLEN];
+	u8 outbuf[BUFLEN];
+
+	/*
+	 * in case of 88F6281/88F6192 A0,
+	 * Bit7 need to reset to generate random values in KW_REG_UNDOC_0x1470
+	 * Soc reg offsets KW_REG_UNDOC_0x1470 and KW_REG_UNDOC_0x1478 are reserved regs and
+	 * Does not have names at this moment (no errata available)
+	 */
+	writel(readl(KW_REG_UNDOC_0x1478) & ~(1 << 7), KW_REG_UNDOC_0x1478);
+	for (i = 0; i < BUFLEN; i++) {
+		inbuf[i] = readl(KW_REG_UNDOC_0x1470);
+	}
+	md5((u8 *) inbuf, (BUFLEN * sizeof(u32)), outbuf);
+	return outbuf[outbuf[7] % 0x0f];
+}
+
+/*
+ * Window Size
+ * Used with the Base register to set the address window size and location.
+ * Must be programmed from LSB to MSB as sequence of ones followed by
+ * sequence of zeros. The number of ones specifies the size of the window in
+ * 64 KByte granularity (e.g., a value of 0x00FF specifies 256 = 16 MByte).
+ * NOTE: A value of 0x0 specifies 64-KByte size.
+ */
+static unsigned int kw_winctrl_calcsize(unsigned int sizeval)
+{
+	int i;
+	unsigned int j = 0;
+	u32 val = sizeval >> 1;
+
+	for (i = 0; val > 0x10000; i++) {
+		j |= (1 << i);
+		val = val >> 1;
+	}
+	return (0x0000ffff & j);
+}
+
+/* prepares data to be loaded in win_Ctrl register */
+#define KWCPU_WIN_CTRL_DATA(size, target, attr, en) (en | (target << 4) \
+			| (attr << 8) | (kw_winctrl_calcsize(size) << 16))
+
+/*
+ * kw_config_adr_windows - Configure address Windows
+ *
+ * There are 8 address windows supported by Kirkwood Soc to addess different
+ * devices. Each window can be configured for size, BAR and remap addr
+ * Below configuration is standard for most of the cases
+ *
+ * If remap function not used, remap_lo must be set as base
+ *
+ * Reference Documentation:
+ * Mbus-L to Mbus Bridge Registers Configuration.
+ * (Sec 25.1 and 25.3 of Datasheet)
+ */
+int kw_config_adr_windows(void)
+{
+	struct kwwin_registers *winregs =
+		(struct kwwin_registers *)KW_CPU_WIN_BASE;
+
+	/* Window 0: PCIE MEM address space */
+	writel(KWCPU_WIN_CTRL_DATA(1024 * 1024 * 256, KWCPU_TARGET_PCIE,
+		KWCPU_ATTR_PCIE_MEM, KWCPU_WIN_ENABLE), &winregs[0].ctrl);
+
+	writel(KW_DEFADR_PCI_MEM, &winregs[0].base);
+	writel(KW_DEFADR_PCI_MEM, &winregs[0].remap_lo);
+	writel(0x0, &winregs[0].remap_hi);
+
+	/* Window 1: PCIE IO address space */
+	writel(KWCPU_WIN_CTRL_DATA(1024 * 64, KWCPU_TARGET_PCIE,
+		KWCPU_ATTR_PCIE_IO, KWCPU_WIN_ENABLE), &winregs[1].ctrl);
+	writel(KW_DEFADR_PCI_IO, &winregs[1].base);
+	writel(KW_DEFADR_PCI_IO_REMAP, &winregs[1].remap_lo);
+	writel(0x0, &winregs[1].remap_hi);
+
+	/* Window 2: NAND Flash address space */
+	writel(KWCPU_WIN_CTRL_DATA(1024 * 1024 * 128, KWCPU_TARGET_MEMORY,
+		KWCPU_ATTR_NANDFLASH, KWCPU_WIN_ENABLE), &winregs[2].ctrl);
+	writel(KW_DEFADR_NANDF, &winregs[2].base);
+	writel(KW_DEFADR_NANDF, &winregs[2].remap_lo);
+	writel(0x0, &winregs[2].remap_hi);
+
+	/* Window 3: SPI Flash address space */
+	writel(KWCPU_WIN_CTRL_DATA(1024 * 1024 * 128, KWCPU_TARGET_MEMORY,
+		KWCPU_ATTR_SPIFLASH, KWCPU_WIN_ENABLE), &winregs[3].ctrl);
+	writel(KW_DEFADR_SPIF, &winregs[3].base);
+	writel(KW_DEFADR_SPIF, &winregs[3].remap_lo);
+	writel(0x0, &winregs[3].remap_hi);
+
+	/* Window 4: BOOT Memory address space */
+	writel(KWCPU_WIN_CTRL_DATA(1024 * 1024 * 128, KWCPU_TARGET_MEMORY,
+		KWCPU_ATTR_BOOTROM, KWCPU_WIN_ENABLE), &winregs[4].ctrl);
+	writel(KW_DEFADR_BOOTROM, &winregs[4].base);
+
+	/* Window 5: Security SRAM address space */
+	writel(KWCPU_WIN_CTRL_DATA(1024 * 64, KWCPU_TARGET_SASRAM,
+		KWCPU_ATTR_SASRAM, KWCPU_WIN_ENABLE), &winregs[5].ctrl);
+	writel(KW_DEFADR_SASRAM, &winregs[5].base);
+
+	/* Window 6-7: Disabled */
+	writel(KWCPU_WIN_DISABLE, &winregs[6].ctrl);
+	writel(KWCPU_WIN_DISABLE, &winregs[7].ctrl);
+
+	return 0;
+}
+
+/*
+ * kw_config_gpio - GPIO configuration
+ */
+void kw_config_gpio(u32 gpp0_oe_val, u32 gpp1_oe_val, u32 gpp0_oe, u32 gpp1_oe)
+{
+	struct kwgpio_registers *gpio0reg =
+		(struct kwgpio_registers *)KW_GPIO0_BASE;
+	struct kwgpio_registers *gpio1reg =
+		(struct kwgpio_registers *)KW_GPIO1_BASE;
+
+	/* Init GPIOS to default values as per board requirement */
+	writel(gpp0_oe_val, &gpio0reg->dout);
+	writel(gpp1_oe_val, &gpio1reg->dout);
+	writel(gpp0_oe, &gpio0reg->oe);
+	writel(gpp1_oe, &gpio1reg->oe);
+}
+
+/*
+ * kw_config_mpp - Multi-Purpose Pins Functionality configuration
+ *
+ * Each MPP can be configured to different functionality through
+ * MPP control register, ref (sec 6.1 of kirkwood h/w specification)
+ *
+ * There are maximum 64 Multi-Pourpose Pins on Kirkwood
+ * Each MPP functionality can be configuration by a 4bit value
+ * of MPP control reg, the value and associated functionality depends
+ * upon used SoC varient
+ */
+int kw_config_mpp(u32 mpp0_7, u32 mpp8_15, u32 mpp16_23, u32 mpp24_31,
+		u32 mpp32_39, u32 mpp40_47, u32 mpp48_55)
+{
+	u32 *mppreg = (u32 *) KW_MPP_BASE;
+
+	/* program mpp registers */
+	writel(mpp0_7, &mppreg[0]);
+	writel(mpp8_15, &mppreg[1]);
+	writel(mpp16_23, &mppreg[2]);
+	writel(mpp24_31, &mppreg[3]);
+	writel(mpp32_39, &mppreg[4]);
+	writel(mpp40_47, &mppreg[5]);
+	writel(mpp48_55, &mppreg[6]);
+	return 0;
+}
+
+#if defined(CONFIG_DISPLAY_CPUINFO)
+int print_cpuinfo(void)
+{
+	char *name = "Unknown";
+
+	switch (readl(KW_REG_DEVICE_ID) & 0x03) {
+	case 1:
+		name = "88F6192_A0";
+		break;
+	case 2:
+		name = "88F6281_A0";
+		break;
+	default:
+		printf("SoC:   Unsupported Kirkwood\n");
+		return -1;
+	}
+	printf("SoC:   Kirkwood %s\n", name);
+	return 0;
+}
+#endif /* CONFIG_DISPLAY_CPUINFO */
+
+#ifdef CONFIG_ARCH_CPU_INIT
+int arch_cpu_init(void)
+{
+	u32 reg;
+	struct kwcpu_registers *cpureg =
+		(struct kwcpu_registers *)KW_CPU_REG_BASE;
+
+	/* Linux expects` the internal registers to be at 0xf1000000 */
+	writel(KW_REGS_PHY_BASE, KW_OFFSET_REG);
+
+	/* Enable and invalidate L2 cache in write through mode */
+	writel(readl(&cpureg->l2_cfg) | 0x18, &cpureg->l2_cfg);
+	invalidate_l2_cache();
+
+	kw_config_adr_windows();
+
+#ifdef CONFIG_KIRKWOOD_RGMII_PAD_1V8
+	/*
+	 * Configures the I/O voltage of the pads connected to Egigabit
+	 * Ethernet interface to 1.8V
+	 * By defult it is set to 3.3V
+	 */
+	reg = readl(KW_REG_MPP_OUT_DRV_REG);
+	reg |= (1 << 7);
+	writel(reg, KW_REG_MPP_OUT_DRV_REG);
+#endif
+#ifdef CONFIG_KIRKWOOD_EGIGA_INIT
+	/*
+	 * Set egiga port0/1 in normal functional mode
+	 * This is required becasue on kirkwood by default ports are in reset mode
+	 * OS egiga driver may not have provision to set them in normal mode
+	 * and if u-boot is build without network support, network may fail at OS level
+	 */
+	reg = readl(KWGBE_PORT_SERIAL_CONTROL1_REG(0));
+	reg &= ~(1 << 4);	/* Clear PortReset Bit */
+	writel(reg, (KWGBE_PORT_SERIAL_CONTROL1_REG(0)));
+	reg = readl(KWGBE_PORT_SERIAL_CONTROL1_REG(1));
+	reg &= ~(1 << 4);	/* Clear PortReset Bit */
+	writel(reg, (KWGBE_PORT_SERIAL_CONTROL1_REG(1)));
+#endif
+#ifdef CONFIG_KIRKWOOD_PCIE_INIT
+	/*
+	 * Enable PCI Express Port0
+	 */
+	reg = readl(&cpureg->ctrl_stat);
+	reg |= (1 << 0);	/* Set PEX0En Bit */
+	writel(reg, &cpureg->ctrl_stat);
+#endif
+	return 0;
+}
+#endif /* CONFIG_ARCH_CPU_INIT */
+
+/*
+ * SOC specific misc init
+ */
+#if defined(CONFIG_ARCH_MISC_INIT)
+int arch_misc_init(void)
+{
+	volatile u32 temp;
+
+	/*CPU streaming & write allocate */
+	temp = readfr_extra_feature_reg();
+	temp &= ~(1 << 28);	/* disable wr alloc */
+	writefr_extra_feature_reg(temp);
+
+	temp = readfr_extra_feature_reg();
+	temp &= ~(1 << 29);	/* streaming disabled */
+	writefr_extra_feature_reg(temp);
+
+	/* L2Cache settings */
+	temp = readfr_extra_feature_reg();
+	/* Disable L2C pre fetch - Set bit 24 */
+	temp |= (1 << 24);
+	/* enable L2C - Set bit 22 */
+	temp |= (1 << 22);
+	writefr_extra_feature_reg(temp);
+
+	icache_enable();
+	/* Change reset vector to address 0x0 */
+	temp = get_cr();
+	set_cr(temp & ~CR_V);
+
+	return 0;
+}
+#endif /* CONFIG_ARCH_MISC_INIT */
+
+#ifdef CONFIG_KIRKWOOD_EGIGA
+int cpu_eth_init(bd_t *bis)
+{
+	kirkwood_egiga_initialize(bis);
+	return 0;
+}
+#endif
diff --git a/cpu/arm926ejs/kirkwood/dram.c b/cpu/arm926ejs/kirkwood/dram.c
new file mode 100644
index 0000000..8f2a18a
--- /dev/null
+++ b/cpu/arm926ejs/kirkwood/dram.c
@@ -0,0 +1,58 @@
+/*
+ * (C) Copyright 2009
+ * Marvell Semiconductor <www.marvell.com>
+ * Written-by: Prafulla Wadaskar <prafulla@marvell.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+#include <config.h>
+#include <asm/arch/kirkwood.h>
+
+#define KW_REG_CPUCS_WIN_BAR(x)		(KW_REGISTER(0x1500) + (x * 0x08))
+#define KW_REG_CPUCS_WIN_SZ(x)		(KW_REGISTER(0x1504) + (x * 0x08))
+/*
+ * kw_sdram_bar - reads SDRAM Base Address Register
+ */
+u32 kw_sdram_bar(enum memory_bank bank)
+{
+	u32 result = 0;
+	u32 enable = 0x01 & readl(KW_REG_CPUCS_WIN_SZ(bank));
+
+	if ((!enable) || (bank > BANK3))
+		return 0;
+
+	result = readl(KW_REG_CPUCS_WIN_BAR(bank));
+	return result;
+}
+
+/*
+ * kw_sdram_bs - reads SDRAM Bank size
+ */
+u32 kw_sdram_bs(enum memory_bank bank)
+{
+	u32 result = 0;
+	u32 enable = 0x01 & readl(KW_REG_CPUCS_WIN_SZ(bank));
+
+	if ((!enable) || (bank > BANK3))
+		return 0;
+	result = 0xff000000 & readl(KW_REG_CPUCS_WIN_SZ(bank));
+	result += 0x01000000;
+	return result;
+}
diff --git a/cpu/arm926ejs/kirkwood/mpp.c b/cpu/arm926ejs/kirkwood/mpp.c
new file mode 100644
index 0000000..b2f0ad5
--- /dev/null
+++ b/cpu/arm926ejs/kirkwood/mpp.c
@@ -0,0 +1,80 @@
+/*
+ * arch/arm/mach-kirkwood/mpp.c
+ *
+ * MPP functions for Marvell Kirkwood SoCs
+ * Referenced from Linux kernel source
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <common.h>
+#include <asm/arch/kirkwood.h>
+#include <asm/arch/mpp.h>
+
+static u32 kirkwood_variant(void)
+{
+	switch (readl(KW_REG_DEVICE_ID) & 0x03) {
+	case 1:
+		return MPP_F6192_MASK;
+	case 2:
+		return MPP_F6281_MASK;
+	default:
+		debug("MPP setup: unknown kirkwood variant\n");
+		return 0;
+	}
+}
+
+#define MPP_CTRL(i)	(KW_MPP_BASE + (i* 4))
+#define MPP_NR_REGS	(1 + MPP_MAX/8)
+
+void kirkwood_mpp_conf(u32 *mpp_list)
+{
+	u32 mpp_ctrl[MPP_NR_REGS];
+	unsigned int variant_mask;
+	int i;
+
+	variant_mask = kirkwood_variant();
+	if (!variant_mask)
+		return;
+
+	debug( "initial MPP regs:");
+	for (i = 0; i < MPP_NR_REGS; i++) {
+		mpp_ctrl[i] = readl(MPP_CTRL(i));
+		debug(" %08x", mpp_ctrl[i]);
+	}
+	debug("\n");
+
+
+	while (*mpp_list) {
+		unsigned int num = MPP_NUM(*mpp_list);
+		unsigned int sel = MPP_SEL(*mpp_list);
+		int shift;
+
+		if (num > MPP_MAX) {
+			debug("kirkwood_mpp_conf: invalid MPP "
+					"number (%u)\n", num);
+			continue;
+		}
+		if (!(*mpp_list & variant_mask)) {
+			debug("kirkwood_mpp_conf: requested MPP%u config "
+				"unavailable on this hardware\n", num);
+			continue;
+		}
+
+		shift = (num & 7) << 2;
+		mpp_ctrl[num / 8] &= ~(0xf << shift);
+		mpp_ctrl[num / 8] |= sel << shift;
+
+		mpp_list++;
+	}
+
+	debug("  final MPP regs:");
+	for (i = 0; i < MPP_NR_REGS; i++) {
+		writel(mpp_ctrl[i], MPP_CTRL(i));
+		debug(" %08x", mpp_ctrl[i]);
+	}
+	debug("\n");
+
+}
diff --git a/cpu/arm926ejs/kirkwood/timer.c b/cpu/arm926ejs/kirkwood/timer.c
new file mode 100644
index 0000000..817ff42
--- /dev/null
+++ b/cpu/arm926ejs/kirkwood/timer.c
@@ -0,0 +1,168 @@
+/*
+ * Copyright (C) Marvell International Ltd. and its affiliates
+ * Written-by: Prafulla Wadaskar <prafulla@marvell.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+#include <common.h>
+#include <asm/arch/kirkwood.h>
+
+#define UBOOT_CNTR	0	/* counter to use for uboot timer */
+
+/* Timer reload and current value registers */
+struct kwtmr_val {
+	u32 reload;	/* Timer reload reg */
+	u32 val;	/* Timer value reg */
+};
+
+/* Timer registers */
+struct kwtmr_registers {
+	u32 ctrl;	/* Timer control reg */
+	u32 pad[3];
+	struct kwtmr_val tmr[2];
+	u32 wdt_reload;
+	u32 wdt_val;
+};
+
+struct kwtmr_registers *kwtmr_regs = (struct kwtmr_registers *)KW_TIMER_BASE;
+
+/*
+ * ARM Timers Registers Map
+ */
+#define CNTMR_CTRL_REG			&kwtmr_regs->ctrl
+#define CNTMR_RELOAD_REG(tmrnum)	&kwtmr_regs->tmr[tmrnum].reload
+#define CNTMR_VAL_REG(tmrnum)		&kwtmr_regs->tmr[tmrnum].val
+
+/*
+ * ARM Timers Control Register
+ * CPU_TIMERS_CTRL_REG (CTCR)
+ */
+#define CTCR_ARM_TIMER_EN_OFFS(cntr)	(cntr * 2)
+#define CTCR_ARM_TIMER_EN_MASK(cntr)	(1 << CTCR_ARM_TIMER_EN_OFFS)
+#define CTCR_ARM_TIMER_EN(cntr)		(1 << CTCR_ARM_TIMER_EN_OFFS(cntr))
+#define CTCR_ARM_TIMER_DIS(cntr)	(0 << CTCR_ARM_TIMER_EN_OFFS(cntr))
+
+#define CTCR_ARM_TIMER_AUTO_OFFS(cntr)	((cntr * 2) + 1)
+#define CTCR_ARM_TIMER_AUTO_MASK(cntr)	(1 << 1)
+#define CTCR_ARM_TIMER_AUTO_EN(cntr)	(1 << CTCR_ARM_TIMER_AUTO_OFFS(cntr))
+#define CTCR_ARM_TIMER_AUTO_DIS(cntr)	(0 << CTCR_ARM_TIMER_AUTO_OFFS(cntr))
+
+/*
+ * ARM Timer\Watchdog Reload Register
+ * CNTMR_RELOAD_REG (TRR)
+ */
+#define TRG_ARM_TIMER_REL_OFFS		0
+#define TRG_ARM_TIMER_REL_MASK		0xffffffff
+
+/*
+ * ARM Timer\Watchdog Register
+ * CNTMR_VAL_REG (TVRG)
+ */
+#define TVR_ARM_TIMER_OFFS		0
+#define TVR_ARM_TIMER_MASK		0xffffffff
+#define TVR_ARM_TIMER_MAX		0xffffffff
+#define TIMER_LOAD_VAL 			0xffffffff
+
+#define READ_TIMER			(readl(CNTMR_VAL_REG(UBOOT_CNTR)) /	\
+					 (CONFIG_SYS_TCLK / 1000))
+
+static ulong timestamp;
+static ulong lastdec;
+
+void reset_timer_masked(void)
+{
+	/* reset time */
+	lastdec = READ_TIMER;
+	timestamp = 0;
+}
+
+ulong get_timer_masked(void)
+{
+	ulong now = READ_TIMER;
+
+	if (lastdec >= now) {
+		/* normal mode */
+		timestamp += lastdec - now;
+	} else {
+		/* we have an overflow ... */
+		timestamp += lastdec +
+			(TIMER_LOAD_VAL / (CONFIG_SYS_TCLK / 1000)) - now;
+	}
+	lastdec = now;
+
+	return timestamp;
+}
+
+void reset_timer(void)
+{
+	reset_timer_masked();
+}
+
+ulong get_timer(ulong base)
+{
+	return get_timer_masked() - base;
+}
+
+void set_timer(ulong t)
+{
+	timestamp = t;
+}
+
+void udelay(unsigned long usec)
+{
+	uint current;
+	ulong delayticks;
+
+	current = readl(CNTMR_VAL_REG(UBOOT_CNTR));
+	delayticks = (usec * (CONFIG_SYS_TCLK / 1000000));
+
+	if (current < delayticks) {
+		delayticks -= current;
+		while (readl(CNTMR_VAL_REG(UBOOT_CNTR)) < current) ;
+		while ((TIMER_LOAD_VAL - delayticks) <
+			readl(CNTMR_VAL_REG(UBOOT_CNTR))) ;
+	} else {
+		while (readl(CNTMR_VAL_REG(UBOOT_CNTR)) >
+			(current - delayticks)) ;
+	}
+}
+
+/*
+ * init the counter
+ */
+int timer_init(void)
+{
+	unsigned int cntmrctrl;
+
+	/* load value into timer */
+	writel(TIMER_LOAD_VAL, CNTMR_RELOAD_REG(UBOOT_CNTR));
+	writel(TIMER_LOAD_VAL, CNTMR_VAL_REG(UBOOT_CNTR));
+
+	/* enable timer in auto reload mode */
+	cntmrctrl = readl(CNTMR_CTRL_REG);
+	cntmrctrl |= CTCR_ARM_TIMER_EN(UBOOT_CNTR);
+	cntmrctrl |= CTCR_ARM_TIMER_AUTO_EN(UBOOT_CNTR);
+	writel(cntmrctrl, CNTMR_CTRL_REG);
+
+	/* init the timestamp and lastdec value */
+	reset_timer_masked();
+
+	return 0;
+}