ARM: Add Altera SOCFPGA Cyclone5

Add minimal support for Altera's SOCFPGA Cyclone 5 hardware.

Signed-off-by: Dinh Nguyen <dinguyen@altera.com>
Signed-off-by: Chin Liang See <clsee@altera.com>
Signed-off-by: Pavel Machek <pavel@denx.de>
Reviewed-by: Marek Vasut <marex@denx.de>
Acked-by: Tom Trini <trini@ti.com>
Cc: Wolfgang Denx <wd@denx.de>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Stefan Roese <sr@denx.de>
----
v8: Remove no_return attribute for reset_cpu

Based on v2012.10-rc2

7 files changed, 410 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv7/socfpga/Makefile b/arch/arm/cpu/armv7/socfpga/Makefile
new file mode 100644
index 0000000..376a4bd
--- /dev/null
+++ b/arch/arm/cpu/armv7/socfpga/Makefile
@@ -0,0 +1,51 @@
+#
+# (C) Copyright 2000-2003
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# Copyright (C) 2012 Altera Corporation <www.altera.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 $(TOPDIR)/config.mk
+
+LIB	=  $(obj)lib$(SOC).o
+
+SOBJS	:= lowlevel_init.o
+COBJS-y	:= misc.o timer.o
+COBJS-$(CONFIG_SPL_BUILD) += spl.o
+
+COBJS	:= $(COBJS-y)
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS) $(SOBJS))
+
+all:	 $(obj).depend $(LIB)
+
+$(LIB):	$(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/arch/arm/cpu/armv7/socfpga/config.mk b/arch/arm/cpu/armv7/socfpga/config.mk
new file mode 100644
index 0000000..b72ed1e
--- /dev/null
+++ b/arch/arm/cpu/armv7/socfpga/config.mk
@@ -0,0 +1,16 @@
+#
+# Copyright (C) 2011, Texas Instruments, Incorporated - http://www.ti.com/
+#
+# 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 "as is" WITHOUT ANY WARRANTY of any
+# kind, whether express or implied; without even the implied warranty
+# of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+ifndef CONFIG_SPL_BUILD
+ALL-y	+= $(obj)u-boot.img
+endif
diff --git a/arch/arm/cpu/armv7/socfpga/lowlevel_init.S b/arch/arm/cpu/armv7/socfpga/lowlevel_init.S
new file mode 100644
index 0000000..001b37d
--- /dev/null
+++ b/arch/arm/cpu/armv7/socfpga/lowlevel_init.S
@@ -0,0 +1,77 @@
+/*
+ *  Copyright (C) 2012 Altera Corporation <www.altera.com>
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <version.h>
+
+/* Save the parameter pass in by previous boot loader */
+.global save_boot_params
+save_boot_params:
+	/* save the parameter here */
+
+	/*
+	 * Setup stack for exception, which is located
+	 * at the end of on-chip RAM. We don't expect exception prior to
+	 * relocation and if that happens, we won't worry -- it will overide
+	 * global data region as the code will goto reset. After relocation,
+	 * this region won't be used by other part of program.
+	 * Hence it is safe.
+	 */
+	ldr	r0, =(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE)
+	ldr	r1, =IRQ_STACK_START_IN
+	str	r0, [r1]
+
+	bx	lr
+
+
+/* Set up the platform, once the cpu has been initialized */
+.globl lowlevel_init
+lowlevel_init:
+
+	/* Remap */
+#ifdef CONFIG_SPL_BUILD
+	/*
+	 * SPL : configure the remap (L3 NIC-301 GPV)
+	 * so the on-chip RAM at lower memory instead ROM.
+	 */
+	ldr	r0, =SOCFPGA_L3REGS_ADDRESS
+	mov	r1, #0x19
+	str	r1, [r0]
+#else
+	/*
+	 * U-Boot : configure the remap (L3 NIC-301 GPV)
+	 * so the SDRAM at lower memory instead on-chip RAM.
+	 */
+	ldr	r0, =SOCFPGA_L3REGS_ADDRESS
+	mov	r1, #0x2
+	str	r1, [r0]
+
+	/* Private components security */
+
+	/*
+	 * U-Boot : configure private timer, global timer and cpu
+	 * component access as non secure for kernel stage (as required
+	 * by kernel)
+	 */
+	mrc	p15,4,r0,c15,c0,0
+	add	r1, r0, #0x54
+	ldr	r2, [r1]
+	orr	r2, r2, #0xff
+	orr	r2, r2, #0xf00
+	str	r2, [r1]
+#endif	/* #ifdef CONFIG_SPL_BUILD */
+	mov	pc, lr
diff --git a/arch/arm/cpu/armv7/socfpga/misc.c b/arch/arm/cpu/armv7/socfpga/misc.c
new file mode 100644
index 0000000..fa16424
--- /dev/null
+++ b/arch/arm/cpu/armv7/socfpga/misc.c
@@ -0,0 +1,54 @@
+/*
+ *  Copyright (C) 2012 Altera Corporation <www.altera.com>
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/reset_manager.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static const struct socfpga_reset_manager *reset_manager_base =
+		(void *)SOCFPGA_RSTMGR_ADDRESS;
+
+/*
+ * Write the reset manager register to cause reset
+ */
+void reset_cpu(ulong addr)
+{
+	/* request a warm reset */
+	writel(RSTMGR_CTRL_SWWARMRSTREQ_LSB, &reset_manager_base->ctrl);
+	/*
+	 * infinite loop here as watchdog will trigger and reset
+	 * the processor
+	 */
+	while (1)
+		;
+}
+
+/*
+ * Release peripherals from reset based on handoff
+ */
+void reset_deassert_peripherals_handoff(void)
+{
+	writel(0, &reset_manager_base->per_mod_reset);
+}
+
+int dram_init(void)
+{
+	gd->ram_size = get_ram_size((long *)PHYS_SDRAM_1, PHYS_SDRAM_1_SIZE);
+	return 0;
+}
diff --git a/arch/arm/cpu/armv7/socfpga/spl.c b/arch/arm/cpu/armv7/socfpga/spl.c
new file mode 100644
index 0000000..944238b
--- /dev/null
+++ b/arch/arm/cpu/armv7/socfpga/spl.c
@@ -0,0 +1,48 @@
+/*
+ *  Copyright (C) 2012 Altera Corporation <www.altera.com>
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/u-boot.h>
+#include <asm/utils.h>
+#include <version.h>
+#include <image.h>
+#include <malloc.h>
+#include <asm/arch/reset_manager.h>
+#include <spl.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+u32 spl_boot_device(void)
+{
+	return BOOT_DEVICE_RAM;
+}
+
+/*
+ * Board initialization after bss clearance
+ */
+void spl_board_init(void)
+{
+	/* init timer for enabling delay function */
+	timer_init();
+
+	/* de-assert reset for peripherals and bridges based on handoff */
+	reset_deassert_peripherals_handoff();
+
+	/* enable console uart printing */
+	preloader_console_init();
+}
diff --git a/arch/arm/cpu/armv7/socfpga/timer.c b/arch/arm/cpu/armv7/socfpga/timer.c
new file mode 100644
index 0000000..321e9b4
--- /dev/null
+++ b/arch/arm/cpu/armv7/socfpga/timer.c
@@ -0,0 +1,104 @@
+/*
+ *  Copyright (C) 2012 Altera Corporation <www.altera.com>
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/timer.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static const struct socfpga_timer *timer_base = (void *)CONFIG_SYS_TIMERBASE;
+
+/*
+ * Timer initialization
+ */
+int timer_init(void)
+{
+	writel(TIMER_LOAD_VAL, &timer_base->load_val);
+	writel(TIMER_LOAD_VAL, &timer_base->curr_val);
+	writel(readl(&timer_base->ctrl) | 0x3, &timer_base->ctrl);
+	return 0;
+}
+
+static u32 read_timer(void)
+{
+	return readl(&timer_base->curr_val);
+}
+
+/*
+ * Delay x useconds
+ */
+void __udelay(unsigned long usec)
+{
+	unsigned long now, last;
+	/*
+	 * get the tmo value based on timer clock speed
+	 * tmo = delay required / period of timer clock
+	 */
+	long tmo = usec * CONFIG_TIMER_CLOCK_KHZ / 1000;
+
+	last = read_timer();
+	while (tmo > 0) {
+		now = read_timer();
+		if (last >= now)
+			/* normal mode (non roll) */
+			tmo -= last - now;
+		else
+			/* we have overflow of the count down timer */
+			tmo -= TIMER_LOAD_VAL - last + now;
+		last = now;
+	}
+}
+
+/*
+ * Get the timer value
+ */
+ulong get_timer(ulong base)
+{
+	return get_timer_masked() - base;
+}
+
+/*
+ * Timer : get the time difference
+ * Unit of tick is based on the CONFIG_SYS_HZ
+ */
+ulong get_timer_masked(void)
+{
+	/* current tick value */
+	ulong now = read_timer() / (CONFIG_TIMER_CLOCK_KHZ/CONFIG_SYS_HZ);
+	if (gd->lastinc >= now) {
+		/* normal mode (non roll) */
+		/* move stamp forward with absolute diff ticks */
+		gd->tbl += gd->lastinc - now;
+	} else {
+		/* we have overflow of the count down timer */
+		gd->tbl += TIMER_LOAD_VAL - gd->lastinc + now;
+	}
+	gd->lastinc = now;
+	return gd->tbl;
+}
+
+/*
+ * Reset the timer
+ */
+void reset_timer(void)
+{
+	/* capture current decrementer value time */
+	gd->lastinc = read_timer() / (CONFIG_TIMER_CLOCK_KHZ/CONFIG_SYS_HZ);
+	/* start "advancing" time stamp from 0 */
+	gd->tbl = 0;
+}
diff --git a/arch/arm/cpu/armv7/socfpga/u-boot-spl.lds b/arch/arm/cpu/armv7/socfpga/u-boot-spl.lds
new file mode 100644
index 0000000..7cd409c
--- /dev/null
+++ b/arch/arm/cpu/armv7/socfpga/u-boot-spl.lds
@@ -0,0 +1,60 @@
+/*
+ *  Copyright (C) 2012 Altera Corporation <www.altera.com>
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+MEMORY { .sdram : ORIGIN = (0), LENGTH = (0xffffffff) }
+
+OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm")
+OUTPUT_ARCH(arm)
+ENTRY(_start)
+SECTIONS
+{
+	. = 0x00000000;
+
+	. = ALIGN(4);
+	.text	:
+	{
+		arch/arm/cpu/armv7/start.o	(.text)
+		*(.text*)
+	} >.sdram
+
+	. = ALIGN(4);
+	.rodata : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) } >.sdram
+
+	. = ALIGN(4);
+	.data : { *(SORT_BY_ALIGNMENT(.data*)) } >.sdram
+
+	. = ALIGN(4);
+	__image_copy_end = .;
+	_end = .;
+
+	.bss : {
+		. = ALIGN(4);
+		__bss_start = .;
+		*(.bss*)
+		. = ALIGN(4);
+		__bss_end__ = .;
+	} >.sdram
+
+	. = ALIGN(8);
+	__malloc_start = .;
+	. = . + CONFIG_SPL_MALLOC_SIZE;
+	__malloc_end = .;
+
+	. = . + CONFIG_SPL_STACK_SIZE;
+	. = ALIGN(8);
+	__stack_start = .;
+}