nds32/ag102: add ag102 soc support

Add lowlevel ag102 soc support.

Signed-off-by: Macpaul Lin <macpaul@andestech.com>

arch/nds32/cpu/n1213/ag102/Makefile

@@ -0,0 +1,58 @@
+#
+# (C) Copyright 2009
+# Marvell Semiconductor <www.marvell.com>
+# Written-by: Prafulla Wadaskar <prafulla@marvell.com>
+#
+# Copyright (C) 2011 Andes Technology Corporation
+# Shawn Lin, Andes Technology Corporation <nobuhiro@andestech.com>
+# Macpaul Lin, Andes Technology Corporation <macpaul@andestech.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).o
+
+COBJS-y	:= cpu.o timer.o
+
+ifndef CONFIG_SKIP_LOWLEVEL_INIT
+SOBJS	:= lowlevel_init.o
+endif
+
+ifndef CONFIG_SKIP_TRUNOFF_WATCHDOG
+SOBJS	+= watchdog.o
+endif
+
+SRCS	:= $(SOBJS:.o=.S) $(COBJS-y:.o=.c)
+OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS-y))
+
+all:	$(obj).depend $(LIB)
+
+$(LIB):	$(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################

arch/nds32/cpu/n1213/ag102/cpu.c

@@ -0,0 +1,195 @@
+/*
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
+ *
+ * Copyright (C) 2011 Andes Technology Corporation
+ * Shawn Lin, Andes Technology Corporation <nobuhiro@andestech.com>
+ * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/* CPU specific code */
+#include <common.h>
+#include <command.h>
+#include <watchdog.h>
+#include <asm/cache.h>
+
+#include <faraday/ftwdt010_wdt.h>
+
+/*
+ * cleanup_before_linux() is called just before we call linux
+ * it prepares the processor for linux
+ *
+ * we disable interrupt and caches.
+ */
+int cleanup_before_linux(void)
+{
+	disable_interrupts();
+
+#ifdef CONFIG_MMU
+	/* turn off I/D-cache */
+	icache_disable();
+	dcache_disable();
+
+	/* flush I/D-cache */
+	invalidate_icac();
+	invalidate_dcac();
+#endif
+
+	return 0;
+}
+
+int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	disable_interrupts();
+
+	/*
+	 * reset to the base addr of andesboot.
+	 * currently no ROM loader at addr 0.
+	 * do not use reset_cpu(0);
+	 */
+#ifdef CONFIG_FTWDT010_WATCHDOG
+	/*
+	 * workaround: if we use CONFIG_HW_WATCHDOG with ftwdt010, will lead
+	 * automatic hardware reset when booting Linux.
+	 * Please do not use CONFIG_HW_WATCHDOG and WATCHDOG_RESET() here.
+	 */
+	ftwdt010_wdt_reset();
+#endif /* CONFIG_FTWDT010_WATCHDOG */
+	hang();
+
+	/*NOTREACHED*/
+}
+
+static inline unsigned long CACHE_LINE_SIZE(enum cache_t cache)
+{
+	if (cache == ICACHE)
+		return 8 << (((GET_ICM_CFG() & ICM_CFG_MSK_ISZ) \
+					>> ICM_CFG_OFF_ISZ) - 1);
+	else
+		return 8 << (((GET_DCM_CFG() & DCM_CFG_MSK_DSZ) \
+					>> DCM_CFG_OFF_DSZ) - 1);
+}
+
+void dcache_flush_range(unsigned long start, unsigned long end)
+{
+	unsigned long line_size;
+
+	line_size = CACHE_LINE_SIZE(DCACHE);
+
+	while (end > start) {
+		__asm__ volatile ("\n\tcctl %0, L1D_VA_WB" : : "r"(start));
+		__asm__ volatile ("\n\tcctl %0, L1D_VA_INVAL" : : "r"(start));
+		start += line_size;
+	}
+}
+
+void icache_inval_range(unsigned long start, unsigned long end)
+{
+	unsigned long line_size;
+
+	line_size = CACHE_LINE_SIZE(ICACHE);
+	while (end > start) {
+		__asm__ volatile ("\n\tcctl %0, L1I_VA_INVAL" : : "r"(start));
+		start += line_size;
+	}
+}
+
+void flush_cache(unsigned long addr, unsigned long size)
+{
+	dcache_flush_range(addr, addr + size);
+	icache_inval_range(addr, addr + size);
+}
+
+void icache_enable(void)
+{
+	__asm__ __volatile__ (
+		"mfsr	$p0, $mr8\n\t"
+		"ori	$p0, $p0, 0x01\n\t"
+		"mtsr	$p0, $mr8\n\t"
+		"isb\n\t"
+	);
+}
+
+void icache_disable(void)
+{
+	__asm__ __volatile__ (
+		"mfsr	$p0, $mr8\n\t"
+		"li	$p1, ~0x01\n\t"
+		"and	$p0, $p0, $p1\n\t"
+		"mtsr	$p0, $mr8\n\t"
+		"isb\n\t"
+	);
+}
+
+int icache_status(void)
+{
+	int ret;
+
+	 __asm__ __volatile__ (
+		"mfsr	$p0, $mr8\n\t"
+		"andi	%0,  $p0, 0x01\n\t"
+		: "=r" (ret)
+		:
+		: "memory"
+	);
+
+	 return ret;
+}
+
+void dcache_enable(void)
+{
+	 __asm__ __volatile__ (
+		"mfsr	$p0, $mr8\n\t"
+		"ori	$p0, $p0, 0x02\n\t"
+		"mtsr	$p0, $mr8\n\t"
+		"isb\n\t"
+	);
+}
+
+void dcache_disable(void)
+{
+	 __asm__ __volatile__ (
+		"mfsr	$p0, $mr8\n\t"
+		"li	$p1, ~0x02\n\t"
+		"and	$p0, $p0, $p1\n\t"
+		"mtsr	$p0, $mr8\n\t"
+		"isb\n\t"
+	);
+}
+
+int dcache_status(void)
+{
+	int ret;
+
+	__asm__ __volatile__ (
+		"mfsr	$p0, $mr8\n\t"
+		"andi	%0, $p0, 0x02\n\t"
+		: "=r" (ret)
+		:
+		: "memory"
+	 );
+
+	 return ret;
+}

arch/nds32/cpu/n1213/ag102/lowlevel_init.S

@@ -0,0 +1,297 @@
+/*
+ * Copyright (C) 2011 Andes Technology Corporation
+ * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+.text
+
+#include <common.h>
+#include <config.h>
+
+#include <asm/macro.h>
+#include <generated/asm-offsets.h>
+
+/*
+ * parameters for Synopsys DWC DDR2/DDR1 Memory Controller
+ */
+#define DDR2C_BASE_A		(CONFIG_DWCDDR21MCTL_BASE)
+#define DDR2C_CCR_A		(DDR2C_BASE_A + DWCDDR21MCTL_CCR)
+#define DDR2C_DCR_A		(DDR2C_BASE_A + DWCDDR21MCTL_DCR)
+#define DDR2C_IOCR_A		(DDR2C_BASE_A + DWCDDR21MCTL_IOCR)
+#define DDR2C_CSR_A		(DDR2C_BASE_A + DWCDDR21MCTL_CSR)
+#define DDR2C_DRR_A		(DDR2C_BASE_A + DWCDDR21MCTL_DRR)
+#define DDR2C_DLLCR0_A		(DDR2C_BASE_A + DWCDDR21MCTL_DLLCR0)
+#define DDR2C_DLLCR1_A		(DDR2C_BASE_A + DWCDDR21MCTL_DLLCR1)
+#define DDR2C_DLLCR2_A		(DDR2C_BASE_A + DWCDDR21MCTL_DLLCR2)
+#define DDR2C_DLLCR3_A		(DDR2C_BASE_A + DWCDDR21MCTL_DLLCR3)
+#define DDR2C_DLLCR4_A		(DDR2C_BASE_A + DWCDDR21MCTL_DLLCR4)
+#define DDR2C_DLLCR5_A		(DDR2C_BASE_A + DWCDDR21MCTL_DLLCR5)
+#define DDR2C_DLLCR6_A		(DDR2C_BASE_A + DWCDDR21MCTL_DLLCR6)
+#define DDR2C_DLLCR7_A		(DDR2C_BASE_A + DWCDDR21MCTL_DLLCR7)
+#define DDR2C_DLLCR8_A		(DDR2C_BASE_A + DWCDDR21MCTL_DLLCR8)
+#define DDR2C_DLLCR9_A		(DDR2C_BASE_A + DWCDDR21MCTL_DLLCR9)
+#define DDR2C_RSLR0_A		(DDR2C_BASE_A + DWCDDR21MCTL_RSLR0)
+#define DDR2C_RDGR0_A		(DDR2C_BASE_A + DWCDDR21MCTL_RDGR0)
+#define DDR2C_DTAR_A		(DDR2C_BASE_A + DWCDDR21MCTL_DTAR)
+#define DDR2C_MR_A		(DDR2C_BASE_A + DWCDDR21MCTL_MR)
+
+#define DDR2C_CCR_D		CONFIG_SYS_DWCDDR21MCTL_CCR
+#define DDR2C_CCR_D2		CONFIG_SYS_DWCDDR21MCTL_CCR2
+#define DDR2C_DCR_D		CONFIG_SYS_DWCDDR21MCTL_DCR
+#define DDR2C_IOCR_D		CONFIG_SYS_DWCDDR21MCTL_IOCR
+#define DDR2C_CSR_D		CONFIG_SYS_DWCDDR21MCTL_CSR
+#define DDR2C_DRR_D		CONFIG_SYS_DWCDDR21MCTL_DRR
+#define DDR2C_RSLR0_D		CONFIG_SYS_DWCDDR21MCTL_RSLR0
+#define DDR2C_RDGR0_D		CONFIG_SYS_DWCDDR21MCTL_RDGR0
+#define DDR2C_DTAR_D		CONFIG_SYS_DWCDDR21MCTL_DTAR
+#define DDR2C_MR_D		CONFIG_SYS_DWCDDR21MCTL_MR
+
+#define DDR2C_DLLCR0_D	CONFIG_SYS_DWCDDR21MCTL_DLLCR0	/* 0-9 are same */
+
+/*
+ * parameters for the ahbc controller
+ */
+#define AHBC_CR_A		(CONFIG_FTAHBC020S_BASE + FTAHBC020S_CR)
+#define AHBC_BSR6_A	(CONFIG_FTAHBC020S_BASE + FTAHBC020S_SLAVE_BSR_6)
+
+#define AHBC_BSR6_D		CONFIG_SYS_FTAHBC020S_SLAVE_BSR_6
+
+/*
+ * parameters for the ANDES PCU controller
+ */
+#define PCU_PCS4_A		(CONFIG_ANDES_PCU_BASE + ANDES_PCU_PCS4)
+#define PCU_PCS4_D		CONFIG_SYS_ANDES_CPU_PCS4
+
+/*
+ * numeric 7 segment display
+ */
+.macro	led, num
+	write32	CONFIG_DEBUG_LED, \num
+.endm
+
+/*
+ * Waiting for SDRAM to set up
+ */
+/*
+.macro	wait_sdram
+	li	$r0, DDR2C_CSR_A
+1:
+	lwi	$r1, [$r0+FTSDMC021_CR2]
+	bnez	$r1, 1b
+.endm
+*/
+
+#ifndef CONFIG_SKIP_LOWLEVEL_INIT
+.globl	lowlevel_init
+lowlevel_init:
+	move	$r10, $lp
+
+	/* U200 */
+!	led	0x00
+!	jal	scale_to_500mhz
+
+	led	0x10
+	jal	mem_init
+
+	led	0x20
+	jal	remap
+
+	led	0x30
+	ret	$r10
+
+scale_to_500mhz:
+	move	$r11, $lp
+
+	/*
+	 * scale to 500Mhz
+	 */
+	led	0x01
+	write32	PCU_PCS4_A, 0x1102000f			! save data to PCS4
+
+	move	$lp, $r11
+	ret
+
+mem_init:
+	move	$r11, $lp
+
+	/*
+	 * config AHB Controller
+	 */
+	led	0x12
+	write32	AHBC_BSR6_A, AHBC_BSR6_D
+
+	/*
+	 * config Synopsys DWC DDR2/DDR1 Memory Controller
+	 */
+ddr2c_init:
+set_dcr:
+	led	0x14
+	write32	DDR2C_DCR_A, DDR2C_DCR_D			! 0x000020d4
+
+auto_sizing:
+	/*
+	 * ebios: $r10->$r7, $r11->$r8, $r12->$r9, $r13->$r12, $r14->$r13
+	 */
+set_iocr:
+	led	0x19
+	write32 DDR2C_IOCR_A, DDR2C_IOCR_D
+set_drr:
+	led	0x16
+	write32	DDR2C_DRR_A, DDR2C_DRR_D			! 0x00034812
+set_dllcr:
+	led	0x18
+	write32 DDR2C_DLLCR0_A, DDR2C_DLLCR0_D
+	write32 DDR2C_DLLCR1_A, DDR2C_DLLCR0_D
+	write32 DDR2C_DLLCR2_A, DDR2C_DLLCR0_D
+	write32 DDR2C_DLLCR3_A, DDR2C_DLLCR0_D
+	write32 DDR2C_DLLCR4_A, DDR2C_DLLCR0_D
+	write32 DDR2C_DLLCR5_A, DDR2C_DLLCR0_D
+	write32 DDR2C_DLLCR6_A, DDR2C_DLLCR0_D
+	write32 DDR2C_DLLCR7_A, DDR2C_DLLCR0_D
+	write32 DDR2C_DLLCR8_A, DDR2C_DLLCR0_D
+	write32 DDR2C_DLLCR9_A, DDR2C_DLLCR0_D
+set_rslr0:
+	write32 DDR2C_RSLR0_A, DDR2C_RSLR0_D			! 0x00000040
+set_rdgr0:
+	write32 DDR2C_RDGR0_A, DDR2C_RDGR0_D			! 0x000055cf
+set_dtar:
+	led	0x15
+	write32	DDR2C_DTAR_A, DDR2C_DTAR_D			! 0x00100000
+set_mode:
+	led	0x17
+	write32	DDR2C_MR_A, DDR2C_MR_D				! 0x00000852
+set_ccr:
+	write32 DDR2C_CCR_A, DDR2C_CCR_D
+
+#ifdef TRIGGER_INIT:
+trigger_init:
+	write32 DDR2C_CCR_A, DDR2C_CCR_D			! 0x80020000
+
+	/* Wait for ddr init state to be set */
+	msync	ALL
+	isb
+
+	/* Wait until the config initialization is finish */
+1:
+	la	$r4, DDR2C_CSR_A
+	lwi	$r5, [$r4]
+	srli	$r5, $r5, 23
+	bnez	$r5, 1b
+#endif
+
+data_training:
+!	write32	DDR2C_CCR_A, DDR2C_CCR_D2			! 0x40020004
+
+	/* Wait for ddr init state to be set */
+	msync	ALL
+	isb
+
+	/* wait until the ddr data trainning is complete */
+1:
+	la	$r4, DDR2C_CSR_A
+	lwi	$r5, [$r4]
+	srli	$r6, $r5, 23
+	bnez	$r6, 1b
+
+	lwi	$r1, [$r4]
+	srli	$r6, $r5, 20
+	li	$r5, 0x00ffffff
+	swi	$r1, [$r4]
+	bnez	$r6, ddr2c_init
+
+	led	0x1a
+	move	$lp, $r11
+	ret
+
+remap:
+	move	$r11, $lp
+#ifdef __NDS32_N1213_43U1H__	/* NDS32 V0 ISA - AG101 Only */
+	bal	2f
+relo_base:
+	move	$r0, $lp
+#else
+relo_base:
+	mfusr	$r0, $pc
+#endif /* __NDS32_N1213_43U1H__ */
+
+	/*
+	 * Remapping
+	 */
+#ifdef CONFIG_MEM_REMAP
+	/*
+	 * Copy ROM code to SDRAM base for memory remap layout.
+	 * This is not the real relocation, the real relocation is the function
+	 * relocate_code() is start.S which supports the systems is memory
+	 * remapped or not.
+	 */
+	/*
+	 * Doing memory remap is essential for preparing some non-OS or RTOS
+	 * applications.
+	 *
+	 * This is also a must on ADP-AG101 board.
+	 * The reason is because the ROM/FLASH circuit on PCB board.
+	 * AG101-A0 board has 2 jumpers MA17 and SW5 to configure which
+	 * ROM/FLASH is used to boot.
+	 *
+	 * When SW5 = "0101", MA17 = LO, the ROM is connected to BANK0,
+	 * and the FLASH is connected to BANK1.
+	 * When SW5 = "1010", MA17 = HI, the ROM is disabled (still at BANK0),
+	 * and the FLASH is connected to BANK0.
+	 * It will occur problem when doing flash probing if the flash is at
+	 * BANK0 (0x00000000) while memory remapping was skipped.
+	 *
+	 * Other board like ADP-AG101P may not enable this since there is only
+	 * a FLASH connected to bank0.
+	 */
+	led	0x21
+	li	$r4, PHYS_SDRAM_0_AT_INIT		/* 0x10000000 */
+	li	$r5, 0x0
+	la	$r1, relo_base				/* get $pc or $lp */
+	sub	$r2, $r0, $r1
+	sethi	$r6, hi20(_end)
+	ori	$r6, $r6, lo12(_end)
+	add	$r6, $r6, $r2
+1:
+	lwi.p	$r7, [$r5], #4
+	swi.p	$r7, [$r4], #4
+	blt	$r5, $r6, 1b
+
+	/* set remap bit */
+	/*
+	 * MEM remap bit is operational
+	 * - use it to map writeable memory at 0x00000000, in place of flash
+	 * - before remap: flash/rom 0x00000000, sdram: 0x10000000-0x4fffffff
+	 * - after  remap: flash/rom 0x80000000, sdram: 0x00000000
+	 */
+	led	0x2c
+	setbf15	AHBC_CR_A, FTAHBC020S_CR_REMAP		! 0x1
+
+#endif /* #ifdef CONFIG_MEM_REMAP */
+	move	$lp, $r11
+2:
+	ret
+
+.globl show_led
+show_led:
+    li      $r8, (CONFIG_DEBUG_LED)
+    swi     $r7, [$r8]
+    ret
+#endif /* #ifndef CONFIG_SKIP_LOWLEVEL_INIT */

arch/nds32/cpu/n1213/ag102/timer.c

@@ -0,0 +1,205 @@
+/*
+ * (C) Copyright 2009 Faraday Technology
+ * Po-Yu Chuang <ratbert@faraday-tech.com>
+ *
+ * Copyright (C) 2011 Andes Technology Corporation
+ * Shawn Lin, Andes Technology Corporation <nobuhiro@andestech.com>
+ * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <faraday/fttmr010.h>
+
+static ulong timestamp;
+static ulong lastdec;
+
+int timer_init(void)
+{
+	struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
+	unsigned int cr;
+
+	debug("%s()\n", __func__);
+
+	/* disable timers */
+	writel(0, &tmr->cr);
+
+#ifdef CONFIG_FTTMR010_EXT_CLK
+	/* use 32768Hz oscillator for RTC, WDT, TIMER */
+	ftpmu010_32768osc_enable();
+#endif
+
+	/* setup timer */
+	writel(TIMER_LOAD_VAL, &tmr->timer3_load);
+	writel(TIMER_LOAD_VAL, &tmr->timer3_counter);
+	writel(0, &tmr->timer3_match1);
+	writel(0, &tmr->timer3_match2);
+
+	/* we don't want timer to issue interrupts */
+	writel(FTTMR010_TM3_MATCH1 |
+	       FTTMR010_TM3_MATCH2 |
+	       FTTMR010_TM3_OVERFLOW,
+	       &tmr->interrupt_mask);
+
+	cr = readl(&tmr->cr);
+#ifdef CONFIG_FTTMR010_EXT_CLK
+	cr |= FTTMR010_TM3_CLOCK;	/* use external clock */
+#endif
+	cr |= FTTMR010_TM3_ENABLE;
+	writel(cr, &tmr->cr);
+
+	/* init the timestamp and lastdec value */
+	reset_timer_masked();
+
+	return 0;
+}
+
+/*
+ * timer without interrupts
+ */
+
+/*
+ * reset time
+ */
+void reset_timer_masked(void)
+{
+	struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
+
+	/* capure current decrementer value time */
+#ifdef CONFIG_FTTMR010_EXT_CLK
+	lastdec = readl(&tmr->timer3_counter) / (TIMER_CLOCK / CONFIG_SYS_HZ);
+#else
+	lastdec = readl(&tmr->timer3_counter) / (CONFIG_SYS_CLK_FREQ / 2);
+#endif
+	timestamp = 0;		/* start "advancing" time stamp from 0 */
+
+	debug("%s(): lastdec = %lx\n", __func__, lastdec);
+}
+
+void reset_timer(void)
+{
+	debug("%s()\n", __func__);
+	reset_timer_masked();
+}
+
+/*
+ * return timer ticks
+ */
+ulong get_timer_masked(void)
+{
+	struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
+
+	/* current tick value */
+#ifdef CONFIG_FTTMR010_EXT_CLK
+	ulong now = readl(&tmr->timer3_counter) / (TIMER_CLOCK / CONFIG_SYS_HZ);
+#else
+	ulong now = readl(&tmr->timer3_counter) / \
+			(CONFIG_SYS_CLK_FREQ / 2 / 1024);
+#endif
+
+	debug("%s(): now = %lx, lastdec = %lx\n", __func__, now, lastdec);
+
+	if (lastdec >= now) {
+		/*
+		 * normal mode (non roll)
+		 * move stamp fordward with absoulte diff ticks
+		 */
+		timestamp += lastdec - now;
+	} else {
+		/*
+		 * we have overflow of the count down timer
+		 *
+		 * nts = ts + ld + (TLV - now)
+		 * ts=old stamp, ld=time that passed before passing through -1
+		 * (TLV-now) amount of time after passing though -1
+		 * nts = new "advancing time stamp"...it could also roll and
+		 * cause problems.
+		 */
+		timestamp += lastdec + TIMER_LOAD_VAL - now;
+	}
+
+	lastdec = now;
+
+	debug("%s() returns %lx\n", __func__, timestamp);
+
+	return timestamp;
+}
+
+/*
+ * return difference between timer ticks and base
+ */
+ulong get_timer(ulong base)
+{
+	debug("%s(%lx)\n", __func__, base);
+	return get_timer_masked() - base;
+}
+
+void set_timer(ulong t)
+{
+	debug("%s(%lx)\n", __func__, t);
+	timestamp = t;
+}
+
+/* delay x useconds AND preserve advance timestamp value */
+void __udelay(unsigned long usec)
+{
+	struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
+
+#ifdef CONFIG_FTTMR010_EXT_CLK
+	long tmo = usec * (TIMER_CLOCK / 1000) / 1000;
+#else
+	long tmo = usec * ((CONFIG_SYS_CLK_FREQ / 2) / 1000) / 1000;
+#endif
+	unsigned long now, last = readl(&tmr->timer3_counter);
+
+	debug("%s(%lu)\n", __func__, usec);
+	while (tmo > 0) {
+		now = readl(&tmr->timer3_counter);
+		if (now > last) /* count down timer overflow */
+			tmo -= TIMER_LOAD_VAL + last - now;
+		else
+			tmo -= last - now;
+		last = now;
+	}
+}
+
+/*
+ * This function is derived from PowerPC code (read timebase as long long).
+ * On ARM it just returns the timer value.
+ */
+unsigned long long get_ticks(void)
+{
+	debug("%s()\n", __func__);
+	return get_timer(0);
+}
+
+/*
+ * This function is derived from PowerPC code (timebase clock frequency).
+ * On ARM it returns the number of timer ticks per second.
+ */
+ulong get_tbclk(void)
+{
+	debug("%s()\n", __func__);
+#ifdef CONFIG_FTTMR010_EXT_CLK
+	return CONFIG_SYS_HZ;
+#else
+	return CONFIG_SYS_CLK_FREQ;
+#endif
+}

arch/nds32/cpu/n1213/ag102/watchdog.S

@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2011 Andes Technology Corporation
+ * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <asm/arch-ag102/ag102.h>
+#include <linux/linkage.h>
+
+.text
+
+#ifndef CONFIG_SKIP_TRUNOFF_WATCHDOG
+ENTRY(turnoff_watchdog)
+
+#define WD_CR		0xC
+#define WD_ENABLE	0x1
+
+	! Turn off the watchdog, according to Faraday FTWDT010 spec
+	li 	$p0, (CONFIG_FTWDT010_BASE+WD_CR)	! Get the addr of WD CR
+	lwi	$p1, [$p0]				! Get the config of WD
+	andi	$p1, $p1, 0x1f				! Wipe out useless bits
+	li	$r0, ~WD_ENABLE
+	and	$p1, $p1, $r0				! Set WD disable
+	sw	$p1, [$p0]				! Write back to WD CR
+
+	! Disable Interrupts by clear GIE in $PSW reg
+	setgie.d
+
+	ret
+
+ENDPROC(turnoff_watchdog)
+#endif