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>

5 files changed, 545 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv7/am33xx/Makefile b/arch/arm/cpu/armv7/am33xx/Makefile
new file mode 100644
index 000000000..498df785a
--- /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 000000000..17c962ff7
--- /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 000000000..507b6180e
--- /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 */
diff --git a/arch/arm/include/asm/arch-am33xx/cpu.h b/arch/arm/include/asm/arch-am33xx/cpu.h
new file mode 100644
index 000000000..ad9156eb4
--- /dev/null
+++ b/arch/arm/include/asm/arch-am33xx/cpu.h
@@ -0,0 +1,218 @@
+/*
+ * cpu.h
+ *
+ * AM33xx specific header file
+ *
+ * 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 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.
+ */
+
+#ifndef _AM33XX_CPU_H
+#define _AM33XX_CPU_H
+
+#if !(defined(__KERNEL_STRICT_NAMES) || defined(__ASSEMBLY__))
+#include <asm/types.h>
+#endif /* !(__KERNEL_STRICT_NAMES || __ASSEMBLY__) */
+
+#include <asm/arch/hardware.h>
+
+#define BIT(x)				(1 << x)
+#define CL_BIT(x)			(0 << x)
+
+/* Timer register bits */
+#define TCLR_ST				BIT(0)	/* Start=1 Stop=0 */
+#define TCLR_AR				BIT(1)	/* Auto reload */
+#define TCLR_PRE			BIT(5)	/* Pre-scaler enable */
+#define TCLR_PTV_SHIFT			(2)	/* Pre-scaler shift value */
+#define TCLR_PRE_DISABLE		CL_BIT(5) /* Pre-scalar disable */
+
+/* device type */
+#define DEVICE_MASK			(BIT(8) | BIT(9) | BIT(10))
+#define TST_DEVICE			0x0
+#define EMU_DEVICE			0x1
+#define HS_DEVICE			0x2
+#define GP_DEVICE			0x3
+
+/* cpu-id for AM33XX family */
+#define AM335X				0xB944
+#define DEVICE_ID			0x44E10600
+
+/* This gives the status of the boot mode pins on the evm */
+#define SYSBOOT_MASK			(BIT(0) | BIT(1) | BIT(2)\
+					| BIT(3) | BIT(4))
+
+/* Reset control */
+#ifdef CONFIG_AM335X
+#define PRM_RSTCTRL			0x44E00F00
+#endif
+#define PRM_RSTCTRL_RESET		0x01
+
+#ifndef __KERNEL_STRICT_NAMES
+#ifndef __ASSEMBLY__
+/* Encapsulating core pll registers */
+struct cm_wkuppll {
+	unsigned int wkclkstctrl;	/* offset 0x00 */
+	unsigned int wkctrlclkctrl;	/* offset 0x04 */
+	unsigned int resv1[1];
+	unsigned int wkl4wkclkctrl;	/* offset 0x0c */
+	unsigned int resv2[4];
+	unsigned int idlestdpllmpu;	/* offset 0x20 */
+	unsigned int resv3[2];
+	unsigned int clkseldpllmpu;	/* offset 0x2c */
+	unsigned int resv4[1];
+	unsigned int idlestdpllddr;	/* offset 0x34 */
+	unsigned int resv5[2];
+	unsigned int clkseldpllddr;	/* offset 0x40 */
+	unsigned int resv6[4];
+	unsigned int clkseldplldisp;	/* offset 0x54 */
+	unsigned int resv7[1];
+	unsigned int idlestdpllcore;	/* offset 0x5c */
+	unsigned int resv8[2];
+	unsigned int clkseldpllcore;	/* offset 0x68 */
+	unsigned int resv9[1];
+	unsigned int idlestdpllper;	/* offset 0x70 */
+	unsigned int resv10[3];
+	unsigned int divm4dpllcore;	/* offset 0x80 */
+	unsigned int divm5dpllcore;	/* offset 0x84 */
+	unsigned int clkmoddpllmpu;	/* offset 0x88 */
+	unsigned int clkmoddpllper;	/* offset 0x8c */
+	unsigned int clkmoddpllcore;	/* offset 0x90 */
+	unsigned int clkmoddpllddr;	/* offset 0x94 */
+	unsigned int clkmoddplldisp;	/* offset 0x98 */
+	unsigned int clkseldpllper;	/* offset 0x9c */
+	unsigned int divm2dpllddr;	/* offset 0xA0 */
+	unsigned int divm2dplldisp;	/* offset 0xA4 */
+	unsigned int divm2dpllmpu;	/* offset 0xA8 */
+	unsigned int divm2dpllper;	/* offset 0xAC */
+	unsigned int resv11[1];
+	unsigned int wkup_uart0ctrl;	/* offset 0xB4 */
+	unsigned int resv12[8];
+	unsigned int divm6dpllcore;	/* offset 0xD8 */
+};
+
+/**
+ * Encapsulating peripheral functional clocks
+ * pll registers
+ */
+struct cm_perpll {
+	unsigned int l4lsclkstctrl;	/* offset 0x00 */
+	unsigned int l3sclkstctrl;	/* offset 0x04 */
+	unsigned int l4fwclkstctrl;	/* offset 0x08 */
+	unsigned int l3clkstctrl;	/* offset 0x0c */
+	unsigned int resv1[6];
+	unsigned int emifclkctrl;	/* offset 0x28 */
+	unsigned int ocmcramclkctrl;	/* offset 0x2c */
+	unsigned int resv2[12];
+	unsigned int l4lsclkctrl;	/* offset 0x60 */
+	unsigned int l4fwclkctrl;	/* offset 0x64 */
+	unsigned int resv3[6];
+	unsigned int timer2clkctrl;	/* offset 0x80 */
+	unsigned int resv4[19];
+	unsigned int emiffwclkctrl;	/* offset 0xD0 */
+	unsigned int resv5[2];
+	unsigned int l3instrclkctrl;	/* offset 0xDC */
+	unsigned int l3clkctrl;		/* Offset 0xE0 */
+	unsigned int resv6[14];
+	unsigned int l4hsclkstctrl;	/* offset 0x11C */
+	unsigned int l4hsclkctrl;	/* offset 0x120 */
+};
+
+/* Encapsulating Display pll registers */
+struct cm_dpll {
+	unsigned int resv1[2];
+	unsigned int clktimer2clk;	/* offset 0x08 */
+};
+
+/* Watchdog timer registers */
+struct wd_timer {
+	unsigned int resv1[4];
+	unsigned int wdtwdsc;	/* offset 0x010 */
+	unsigned int wdtwdst;	/* offset 0x014 */
+	unsigned int wdtwisr;	/* offset 0x018 */
+	unsigned int wdtwier;	/* offset 0x01C */
+	unsigned int wdtwwer;	/* offset 0x020 */
+	unsigned int wdtwclr;	/* offset 0x024 */
+	unsigned int wdtwcrr;	/* offset 0x028 */
+	unsigned int wdtwldr;	/* offset 0x02C */
+	unsigned int wdtwtgr;	/* offset 0x030 */
+	unsigned int wdtwwps;	/* offset 0x034 */
+	unsigned int resv2[3];
+	unsigned int wdtwdly;	/* offset 0x044 */
+	unsigned int wdtwspr;	/* offset 0x048 */
+	unsigned int resv3[1];
+	unsigned int wdtwqeoi;	/* offset 0x050 */
+	unsigned int wdtwqstar;	/* offset 0x054 */
+	unsigned int wdtwqsta;	/* offset 0x058 */
+	unsigned int wdtwqens;	/* offset 0x05C */
+	unsigned int wdtwqenc;	/* offset 0x060 */
+	unsigned int resv4[39];
+	unsigned int wdt_unfr;	/* offset 0x100 */
+};
+
+/* Timer Registers */
+struct timer_reg {
+	unsigned int resv1[4];
+	unsigned int tiocpcfgreg;	/* offset 0x10 */
+	unsigned int resv2[9];
+	unsigned int tclrreg;		/* offset 0x38 */
+	unsigned int tcrrreg;		/* offset 0x3C */
+	unsigned int tldrreg;		/* offset 0x40 */
+	unsigned int resv3[4];
+	unsigned int tsicrreg;		/* offset 0x54 */
+};
+
+/* Timer 32 bit registers */
+struct gptimer {
+	unsigned int tidr;		/* offset 0x00 */
+	unsigned int res1[0xc];
+	unsigned int tiocp_cfg;		/* offset 0x10 */
+	unsigned int res2[0xc];
+	unsigned int tier;		/* offset 0x20 */
+	unsigned int tistatr;		/* offset 0x24 */
+	unsigned int tistat;		/* offset 0x28 */
+	unsigned int tisr;		/* offset 0x2c */
+	unsigned int tcicr;		/* offset 0x30 */
+	unsigned int twer;		/* offset 0x34 */
+	unsigned int tclr;		/* offset 0x38 */
+	unsigned int tcrr;		/* offset 0x3c */
+	unsigned int tldr;		/* offset 0x40 */
+	unsigned int ttgr;		/* offset 0x44 */
+	unsigned int twpc;		/* offset 0x48 */
+	unsigned int tmar;		/* offset 0x4c */
+	unsigned int tcar1;		/* offset 0x50 */
+	unsigned int tscir;		/* offset 0x54 */
+	unsigned int tcar2;		/* offset 0x58 */
+};
+
+/* UART Registers */
+struct uart_sys {
+	unsigned int resv1[21];
+	unsigned int uartsyscfg;	/* offset 0x54 */
+	unsigned int uartsyssts;	/* offset 0x58 */
+};
+
+/* VTP Registers */
+struct vtp_reg {
+	unsigned int vtp0ctrlreg;
+};
+
+/* Control Status Register */
+struct ctrl_stat {
+	unsigned int resv1[16];
+	unsigned int statusreg;		/* ofset 0x40 */
+};
+
+void init_timer(void);
+#endif /* __ASSEMBLY__ */
+#endif /* __KERNEL_STRICT_NAMES */
+
+#endif /* _AM33XX_CPU_H */
diff --git a/arch/arm/include/asm/arch-am33xx/hardware.h b/arch/arm/include/asm/arch-am33xx/hardware.h
new file mode 100644
index 000000000..0ec22eb91
--- /dev/null
+++ b/arch/arm/include/asm/arch-am33xx/hardware.h
@@ -0,0 +1,81 @@
+/*
+ * hardware.h
+ *
+ * hardware specific header
+ *
+ * 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 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.
+ */
+
+#ifndef __AM33XX_HARDWARE_H
+#define __AM33XX_HARDWARE_H
+
+/* Module base addresses */
+#define LOW_LEVEL_SRAM_STACK		0x4030B7FC
+#define UART0_BASE			0x44E09000
+
+/* DM Timer base addresses */
+#define DM_TIMER0_BASE			0x4802C000
+#define DM_TIMER1_BASE			0x4802E000
+#define DM_TIMER2_BASE			0x48040000
+#define DM_TIMER3_BASE			0x48042000
+#define DM_TIMER4_BASE			0x48044000
+#define DM_TIMER5_BASE			0x48046000
+#define DM_TIMER6_BASE			0x48048000
+#define DM_TIMER7_BASE			0x4804A000
+
+/* GPIO Base address */
+#define GPIO0_BASE			0x48032000
+#define GPIO1_BASE			0x4804C000
+#define GPIO2_BASE			0x481AC000
+
+/* BCH Error Location Module */
+#define ELM_BASE			0x48080000
+
+/* Watchdog Timer */
+#define WDT_BASE			0x44E35000
+
+/* Control Module Base Address */
+#define CTRL_BASE			0x44E10000
+
+/* PRCM Base Address */
+#define PRCM_BASE			0x44E00000
+
+/* EMIF Base address */
+#define EMIF4_0_CFG_BASE		0x4C000000
+#define EMIF4_1_CFG_BASE		0x4D000000
+#define DMM_BASE			0x4E000000
+
+/* PLL related registers */
+#define CM_PER				0x44E00000
+#define CM_WKUP				0x44E00400
+#define CM_DPLL				0x44E00500
+#define CM_DEVICE			0x44E00700
+#define CM_CEFUSE			0x44E00A00
+#define PRM_DEVICE			0x44E00F00
+
+/* VTP Base address */
+#define VTP0_CTRL_ADDR			0x44E10E0C
+
+/* DDR Base address */
+#define DDR_CTRL_ADDR			0x44E10E04
+#define DDR_CONTROL_BASE_ADDR		0x44E11404
+#define DDR_PHY_BASE_ADDR		0x44E12000
+#define DDR_PHY_BASE_ADDR2		0x44E120A4
+
+/* UART */
+#define DEFAULT_UART_BASE		UART0_BASE
+
+#define DDRPHY_0_CONFIG_BASE		(CTRL_BASE + 0x1400)
+#define DDRPHY_CONFIG_BASE		DDRPHY_0_CONFIG_BASE
+
+#endif /* __AM33XX_HARDWARE_H */