ARM:AM33XX: Added support for AM33xx

This patch adds basic support for AM33xx which is based on ARMV7
Cortex A8 CPU.

Signed-off-by: Chandan Nath <chandan.nath@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

3 files changed, 246 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv7/am33xx/Makefile b/arch/arm/cpu/armv7/am33xx/Makefile
new file mode 100644
index 0000000..498df78
--- /dev/null
+++ b/arch/arm/cpu/armv7/am33xx/Makefile
@@ -0,0 +1,44 @@
+#
+# 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.
+#
+
+include $(TOPDIR)/config.mk
+
+LIB	= $(obj)lib$(SOC).o
+
+SOBJS	:= lowlevel_init.o
+
+COBJS	+= sys_info.o
+
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS) $(COBJS-y) $(SOBJS))
+
+all:	$(obj).depend $(LIB)
+
+$(LIB):	$(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
+
+clean:
+	rm -f $(SOBJS) $(OBJS)
+
+distclean:	clean
+	rm -f $(LIB) core *.bak .depend
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/arch/arm/cpu/armv7/am33xx/lowlevel_init.S b/arch/arm/cpu/armv7/am33xx/lowlevel_init.S
new file mode 100644
index 0000000..17c962f
--- /dev/null
+++ b/arch/arm/cpu/armv7/am33xx/lowlevel_init.S
@@ -0,0 +1,72 @@
+/*
+ * lowlevel_init.S
+ *
+ * AM33XX low level initialization.
+ *
+ * Copyright (C) 2011, Texas Instruments, Incorporated - http://www.ti.com/
+ *
+ * Initial Code by:
+ * Mansoor Ahamed  <mansoor.ahamed@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.
+ */
+
+#include <config.h>
+#include <asm/arch/hardware.h>
+
+_mark1:
+	.word mark1
+_lowlevel_init1:
+	.word lowlevel_init
+_s_init_start:
+	.word s_init_start
+
+_TEXT_BASE:
+	.word	CONFIG_SYS_TEXT_BASE	/* sdram load addr from config.mk */
+
+/*****************************************************************************
+ * lowlevel_init: - Platform low level init.
+ ****************************************************************************/
+.globl lowlevel_init
+lowlevel_init:
+
+	/* The link register is saved in ip by start.S */
+	mov r6, ip
+	/* check if we are already running from RAM */
+	ldr r2, _lowlevel_init1
+	ldr r3, _TEXT_BASE
+	sub r4, r2, r3
+	sub r0, pc, r4
+	ldr sp, SRAM_STACK
+mark1:
+	ldr r5, _mark1
+	sub r5, r5, r2 /* bytes between mark1 and lowlevel_init */
+	sub r0, r0, r5 /* r0 <- _start w.r.t current place of execution */
+	mov r10, #0x0 /* r10 has in_ddr used by s_init() */
+
+	ands r0, r0, #0xC0000000
+	/* MSB 2 bits <> 0 then we are in ocmc or DDR */
+	cmp r0, #0x80000000
+	bne s_init_start
+	mov r10, #0x01
+	b s_init_start
+
+s_init_start:
+	mov r0, r10 /* passing in_ddr in r0 */
+	bl s_init
+	/* back to arch calling code */
+	mov pc, r6
+	/* the literal pools origin */
+	.ltorg
+
+SRAM_STACK:
+	/* Place stack at the top */
+	.word LOW_LEVEL_SRAM_STACK
diff --git a/arch/arm/cpu/armv7/am33xx/sys_info.c b/arch/arm/cpu/armv7/am33xx/sys_info.c
new file mode 100644
index 0000000..507b618
--- /dev/null
+++ b/arch/arm/cpu/armv7/am33xx/sys_info.c
@@ -0,0 +1,130 @@
+/*
+ * sys_info.c
+ *
+ * System information functions
+ *
+ * Copyright (C) 2011, Texas Instruments, Incorporated - http://www.ti.com/
+ *
+ * Derived from Beagle Board and 3430 SDP code by
+ *      Richard Woodruff <r-woodruff2@ti.com>
+ *      Syed Mohammed Khasim <khasim@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 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.
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/clock.h>
+
+struct ctrl_stat *cstat = (struct ctrl_stat *)CTRL_BASE;
+
+/**
+ * get_cpu_rev(void) - extract rev info
+ */
+u32 get_cpu_rev(void)
+{
+	u32 id;
+	u32 rev;
+
+	id = readl(DEVICE_ID);
+	rev = (id >> 28) & 0xff;
+
+	return rev;
+}
+
+/**
+ * get_cpu_type(void) - extract cpu info
+ */
+u32 get_cpu_type(void)
+{
+	u32 id = 0;
+	u32 partnum;
+
+	id = readl(DEVICE_ID);
+	partnum = (id >> 12) & 0xffff;
+
+	return partnum;
+}
+
+/**
+ * get_board_rev() - setup to pass kernel board revision information
+ * returns:(bit[0-3] sub version, higher bit[7-4] is higher version)
+ */
+u32 get_board_rev(void)
+{
+	return BOARD_REV_ID;
+}
+
+/**
+ * get_device_type(): tell if GP/HS/EMU/TST
+ */
+u32 get_device_type(void)
+{
+	int mode;
+	mode = readl(&cstat->statusreg) & (DEVICE_MASK);
+	return mode >>= 8;
+}
+
+/**
+ * get_sysboot_value(void) - return SYS_BOOT[4:0]
+ */
+u32 get_sysboot_value(void)
+{
+	int mode;
+	mode = readl(&cstat->statusreg) & (SYSBOOT_MASK);
+	return mode;
+}
+
+#ifdef CONFIG_DISPLAY_CPUINFO
+/**
+ * Print CPU information
+ */
+int print_cpuinfo(void)
+{
+	char *cpu_s, *sec_s;
+	int arm_freq, ddr_freq;
+
+	switch (get_cpu_type()) {
+	case AM335X:
+		cpu_s = "AM335X";
+		break;
+	default:
+		cpu_s = "Unknown cpu type";
+		break;
+	}
+
+	switch (get_device_type()) {
+	case TST_DEVICE:
+		sec_s = "TST";
+		break;
+	case EMU_DEVICE:
+		sec_s = "EMU";
+		break;
+	case HS_DEVICE:
+		sec_s = "HS";
+		break;
+	case GP_DEVICE:
+		sec_s = "GP";
+		break;
+	default:
+		sec_s = "?";
+	}
+
+	printf("AM%s-%s rev %d\n",
+			cpu_s, sec_s, get_cpu_rev());
+
+	/* TODO: Print ARM and DDR frequencies  */
+
+	return 0;
+}
+#endif	/* CONFIG_DISPLAY_CPUINFO */