arm, am335x: add support for 3 siemens boards

add support for the am335x based boards from siemens:

dxr2:
  - DDR3 128MiB
  - NAND 256MiB
  - Ethernet with external Switch SMSC LAN9303
  - no PMIC
  - internal Watchdog
  - DFU support

pxm2:
  - DDR2 512 MiB
  - NAND 1024 MiB
  - PMIC
  - PHY atheros ar803x
  - USB Host
  - internal Watchdog
  - DFU support

rut:
  - DDR3 256 MiB
  - NAND 256 MiB
  - PMIC
  - PHY natsemi dp83630
  - external Watchdog
  - DFU support

Signed-off-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Roger Meier <r.meier@siemens.com>
Signed-off-by: Samuel Egli <samuel.egli@siemens.com>
Cc: Pascal Bach <pascal.bach@siemens.com>
Cc: Tom Rini <trini@ti.com>

MAINTAINERS

@@ -1087,6 +1087,11 @@ Sergey Yanovich <ynvich@gmail.com>
 
 	lp8x4x		xscale/pxa
 
+Roger Meier <r.meier@siemens.com>
+	dxr2			ARM ARMV7 (AM335x SoC)
+	pxm2			ARM ARMV7 (AM335x SoC)
+	rut			ARM ARMV7 (AM335x SoC)
+
 -------------------------------------------------------------------------
 
 Unknown / orphaned boards:

board/siemens/common/board.c

@@ -0,0 +1,171 @@
+/*
+ * Common board functions for siemens AM335X based boards
+ * (C) Copyright 2013 Siemens Schweiz AG
+ * (C) Heiko Schocher, DENX Software Engineering, hs@denx.de.
+ *
+ * Based on:
+ * U-Boot file:/board/ti/am335x/board.c
+ * Copyright (C) 2011, Texas Instruments, Incorporated - http://www.ti.com/
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <spl.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/omap.h>
+#include <asm/arch/ddr_defs.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/gpio.h>
+#include <asm/arch/mmc_host_def.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/io.h>
+#include <asm/emif.h>
+#include <asm/gpio.h>
+#include <i2c.h>
+#include <miiphy.h>
+#include <cpsw.h>
+#include <watchdog.h>
+#include "../common/factoryset.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifdef CONFIG_SPL_BUILD
+void set_uart_mux_conf(void)
+{
+	enable_uart0_pin_mux();
+}
+
+void set_mux_conf_regs(void)
+{
+	/* Initalize the board header */
+	enable_i2c0_pin_mux();
+	i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
+	if (read_eeprom() < 0)
+		puts("Could not get board ID.\n");
+
+	enable_board_pin_mux();
+}
+
+void sdram_init(void)
+{
+	spl_siemens_board_init();
+	board_init_ddr();
+
+	return;
+}
+#endif /* #ifdef CONFIG_SPL_BUILD */
+
+#ifndef CONFIG_SPL_BUILD
+/*
+ * Basic board specific setup.  Pinmux has been handled already.
+ */
+int board_init(void)
+{
+#if defined(CONFIG_HW_WATCHDOG)
+	hw_watchdog_init();
+#endif /* defined(CONFIG_HW_WATCHDOG) */
+	i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
+	if (read_eeprom() < 0)
+		puts("Could not get board ID.\n");
+
+	gd->bd->bi_arch_number = CONFIG_MACH_TYPE;
+	gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100;
+
+#ifdef CONFIG_FACTORYSET
+	factoryset_read_eeprom(CONFIG_SYS_I2C_EEPROM_ADDR);
+#endif
+	gpmc_init();
+
+#ifdef CONFIG_VIDEO
+	board_video_init();
+#endif
+
+	return 0;
+}
+#endif /* #ifndef CONFIG_SPL_BUILD */
+
+#define OSC	(V_OSCK/1000000)
+const struct dpll_params dpll_ddr = {
+		DDR_PLL_FREQ, OSC-1, 1, -1, -1, -1, -1};
+
+const struct dpll_params *get_dpll_ddr_params(void)
+{
+	return &dpll_ddr;
+}
+
+#ifdef CONFIG_BOARD_LATE_INIT
+int board_late_init(void)
+{
+	omap_nand_switch_ecc(1, 8);
+
+	return 0;
+}
+#endif
+
+#ifndef CONFIG_SPL_BUILD
+#if defined(BOARD_DFU_BUTTON_GPIO)
+/*
+ * This command returns the status of the user button on
+ * Input - none
+ * Returns -	1 if button is held down
+ *		0 if button is not held down
+ */
+static int
+do_userbutton(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	int button = 0;
+	int gpio;
+
+	gpio = BOARD_DFU_BUTTON_GPIO;
+	gpio_request(gpio, "DFU");
+	gpio_direction_input(gpio);
+	if (gpio_get_value(gpio))
+		button = 1;
+	else
+		button = 0;
+
+	gpio_free(gpio);
+	if (!button) {
+		/* LED0 - RED=1: GPIO2_0 2*32 = 64 */
+		gpio_request(BOARD_DFU_BUTTON_LED, "");
+		gpio_direction_output(BOARD_DFU_BUTTON_LED, 1);
+		gpio_set_value(BOARD_DFU_BUTTON_LED, 1);
+	}
+
+	return button;
+}
+
+U_BOOT_CMD(
+	dfubutton, CONFIG_SYS_MAXARGS, 1, do_userbutton,
+	"Return the status of the DFU button",
+	""
+);
+#endif
+
+static int
+do_usertestwdt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	printf("\n\n\n Go into infinite loop\n\n\n");
+	while (1)
+		;
+	return 0;
+};
+
+U_BOOT_CMD(
+	testwdt, CONFIG_SYS_MAXARGS, 1,	do_usertestwdt,
+	"Sends U-Boot into infinite loop",
+	""
+);
+
+#ifndef CONFIG_SYS_DCACHE_OFF
+void enable_caches(void)
+{
+	printf("Enable d-cache\n");
+	/* Enable D-cache. I-cache is already enabled in start.S */
+	dcache_enable();
+}
+#endif /* CONFIG_SYS_DCACHE_OFF */
+#endif /* !CONFIG_SPL_BUILD */