M28: Add MMC SPL

This patch adds SPL code for the M28 board.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Andy Fleming <afleming@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Detlev Zundel <dzu@denx.de>

board/denx/m28evk/Makefile

@@ -25,7 +25,13 @@ include $(TOPDIR)/config.mk
 
 LIB	= $(obj)lib$(BOARD).o
 
+ifndef	CONFIG_SPL_BUILD
 COBJS	:= m28evk.o
+endif
+
+ifdef	CONFIG_SPL_BUILD
+COBJS	:= mem_init.o mmc_boot.o power_init.o
+endif
 
 SRCS	:= $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))
@@ -33,6 +39,8 @@ OBJS	:= $(addprefix $(obj),$(COBJS))
 $(LIB):	$(obj).depend $(OBJS)
 	$(call cmd_link_o_target, $(OBJS))
 
+all:	$(ALL)
+
 #########################################################################
 
 # defines $(obj).depend target

board/denx/m28evk/m28_init.h

@@ -0,0 +1,41 @@
+/*
+ * Freescale i.MX28 SPL functions
+ *
+ * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
+ * on behalf of DENX Software Engineering GmbH
+ *
+ * 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
+ */
+
+#ifndef	__M28_INIT_H__
+#define	__M28_INIT_H__
+
+void early_delay(int delay);
+
+void mx28_power_init(void);
+
+#ifdef	CONFIG_SPL_MX28_PSWITCH_WAIT
+void mx28_power_wait_pswitch(void);
+#else
+static inline void mx28_power_wait_pswitch(void) { }
+#endif
+
+void mx28_mem_init(void);
+
+#endif	/* __M28_INIT_H__ */

board/denx/m28evk/mem_init.c

@@ -0,0 +1,213 @@
+/*
+ * Freescale i.MX28 RAM init
+ *
+ * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
+ * on behalf of DENX Software Engineering GmbH
+ *
+ * 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 <common.h>
+#include <config.h>
+#include <asm/io.h>
+#include <asm/arch/iomux-mx28.h>
+#include <asm/arch/imx-regs.h>
+
+#include "m28_init.h"
+
+uint32_t dram_vals[] = {
+	0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0x00000100, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00010101, 0x01010101, 0x000f0f01, 0x0f02020a,
+	0x00000000, 0x00010101, 0x00000100, 0x00000100, 0x00000000,
+	0x00000002, 0x01010000, 0x05060302, 0x06005003, 0x0a0000c8,
+	0x02009c40, 0x0000030c, 0x0036a609, 0x031a0612, 0x02030202,
+	0x00c8001c, 0x00000000, 0x00000000, 0x00012100, 0xffff0303,
+	0x00012100, 0xffff0303, 0x00012100, 0xffff0303, 0x00012100,
+	0xffff0303, 0x00000003, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000612, 0x01000F02, 0x06120612, 0x00000200,
+	0x00020007, 0xf5014b27, 0xf5014b27, 0xf5014b27, 0xf5014b27,
+	0x07000300, 0x07000300, 0x07000300, 0x07000300, 0x00000006,
+	0x00000000, 0x00000000, 0x01000000, 0x01020408, 0x08040201,
+	0x000f1133, 0x00000000, 0x00001f04, 0x00001f04, 0x00001f04,
+	0x00001f04, 0x00001f04, 0x00001f04, 0x00001f04, 0x00001f04,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0x00010000, 0x00020304, 0x00000004,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x01010000, 0x01000000, 0x03030000, 0x00010303,
+	0x01020202, 0x00000000, 0x02040303, 0x21002103, 0x00061200,
+	0x06120612, 0x04320432, 0x04320432, 0x00040004, 0x00040004,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00010001
+};
+
+void init_m28_200mhz_ddr2(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(dram_vals); i++)
+		writel(dram_vals[i], MXS_DRAM_BASE + (4 * i));
+}
+
+void mx28_mem_init_clock(void)
+{
+	struct mx28_clkctrl_regs *clkctrl_regs =
+		(struct mx28_clkctrl_regs *)MXS_CLKCTRL_BASE;
+
+	/* Gate EMI clock */
+	writel(CLKCTRL_FRAC0_CLKGATEEMI,
+		&clkctrl_regs->hw_clkctrl_frac0_set);
+
+	/* EMI = 205MHz */
+	writel(CLKCTRL_FRAC0_EMIFRAC_MASK,
+		&clkctrl_regs->hw_clkctrl_frac0_set);
+	writel((0x2a << CLKCTRL_FRAC0_EMIFRAC_OFFSET) &
+		CLKCTRL_FRAC0_EMIFRAC_MASK,
+		&clkctrl_regs->hw_clkctrl_frac0_clr);
+
+	/* Ungate EMI clock */
+	writel(CLKCTRL_FRAC0_CLKGATEEMI,
+		&clkctrl_regs->hw_clkctrl_frac0_clr);
+
+	early_delay(11000);
+
+	writel((2 << CLKCTRL_EMI_DIV_EMI_OFFSET) |
+		(1 << CLKCTRL_EMI_DIV_XTAL_OFFSET),
+		&clkctrl_regs->hw_clkctrl_emi);
+
+	/* Unbypass EMI */
+	writel(CLKCTRL_CLKSEQ_BYPASS_EMI,
+		&clkctrl_regs->hw_clkctrl_clkseq_clr);
+
+	early_delay(10000);
+}
+
+void mx28_mem_setup_cpu_and_hbus(void)
+{
+	struct mx28_clkctrl_regs *clkctrl_regs =
+		(struct mx28_clkctrl_regs *)MXS_CLKCTRL_BASE;
+
+	/* CPU = 454MHz and ungate CPU clock */
+	clrsetbits_le32(&clkctrl_regs->hw_clkctrl_frac0,
+		CLKCTRL_FRAC0_CPUFRAC_MASK | CLKCTRL_FRAC0_CLKGATECPU,
+		19 << CLKCTRL_FRAC0_CPUFRAC_OFFSET);
+
+	/* Set CPU bypass */
+	writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
+		&clkctrl_regs->hw_clkctrl_clkseq_set);
+
+	/* HBUS = 151MHz */
+	writel(CLKCTRL_HBUS_DIV_MASK, &clkctrl_regs->hw_clkctrl_hbus_set);
+	writel(((~3) << CLKCTRL_HBUS_DIV_OFFSET) & CLKCTRL_HBUS_DIV_MASK,
+		&clkctrl_regs->hw_clkctrl_hbus_clr);
+
+	early_delay(10000);
+
+	/* CPU clock divider = 1 */
+	clrsetbits_le32(&clkctrl_regs->hw_clkctrl_cpu,
+			CLKCTRL_CPU_DIV_CPU_MASK, 1);
+
+	/* Disable CPU bypass */
+	writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
+		&clkctrl_regs->hw_clkctrl_clkseq_clr);
+}
+
+void mx28_mem_setup_vdda(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+
+	writel((0xc << POWER_VDDACTRL_TRG_OFFSET) |
+		(0x7 << POWER_VDDACTRL_BO_OFFSET_OFFSET) |
+		POWER_VDDACTRL_LINREG_OFFSET_1STEPS_BELOW,
+		&power_regs->hw_power_vddactrl);
+}
+
+void mx28_mem_setup_vddd(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+
+	writel((0x1c << POWER_VDDDCTRL_TRG_OFFSET) |
+		(0x7 << POWER_VDDDCTRL_BO_OFFSET_OFFSET) |
+		POWER_VDDDCTRL_LINREG_OFFSET_1STEPS_BELOW,
+		&power_regs->hw_power_vdddctrl);
+}
+
+void mx28_mem_init(void)
+{
+	struct mx28_clkctrl_regs *clkctrl_regs =
+		(struct mx28_clkctrl_regs *)MXS_CLKCTRL_BASE;
+	struct mx28_pinctrl_regs *pinctrl_regs =
+		(struct mx28_pinctrl_regs *)MXS_PINCTRL_BASE;
+
+	/* Set DDR2 mode */
+	writel(PINCTRL_EMI_DS_CTRL_DDR_MODE_DDR2,
+		&pinctrl_regs->hw_pinctrl_emi_ds_ctrl_set);
+
+	/* Power up PLL0 */
+	writel(CLKCTRL_PLL0CTRL0_POWER,
+		&clkctrl_regs->hw_clkctrl_pll0ctrl0_set);
+
+	early_delay(11000);
+
+	mx28_mem_init_clock();
+
+	mx28_mem_setup_vdda();
+
+	/*
+	 * Configure the DRAM registers
+	 */
+
+	/* Clear START bit from DRAM_CTL16 */
+	clrbits_le32(MXS_DRAM_BASE + 0x40, 1);
+
+	init_m28_200mhz_ddr2();
+
+	/* Clear SREFRESH bit from DRAM_CTL17 */
+	clrbits_le32(MXS_DRAM_BASE + 0x44, 1);
+
+	/* Set START bit in DRAM_CTL16 */
+	setbits_le32(MXS_DRAM_BASE + 0x40, 1);
+
+	/* Wait for bit 20 (DRAM init complete) in DRAM_CTL58 */
+	while (!(readl(MXS_DRAM_BASE + 0xe8) & (1 << 20)))
+		;
+
+	mx28_mem_setup_vddd();
+
+	early_delay(10000);
+
+	mx28_mem_setup_cpu_and_hbus();
+}

board/denx/m28evk/mmc_boot.c

@@ -0,0 +1,273 @@
+/*
+ * Freescale i.MX28 Boot setup
+ *
+ * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
+ * on behalf of DENX Software Engineering GmbH
+ *
+ * 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 <common.h>
+#include <config.h>
+#include <asm/io.h>
+#include <asm/arch/iomux-mx28.h>
+
+#include "m28_init.h"
+
+/*
+ * This delay function is intended to be used only in early stage of boot, where
+ * clock are not set up yet. The timer used here is reset on every boot and
+ * takes a few seconds to roll. The boot doesn't take that long, so to keep the
+ * code simple, it doesn't take rolling into consideration.
+ */
+#define	HW_DIGCTRL_MICROSECONDS	0x8001c0c0
+void early_delay(int delay)
+{
+	uint32_t st = readl(HW_DIGCTRL_MICROSECONDS);
+	st += delay;
+	while (st > readl(HW_DIGCTRL_MICROSECONDS))
+		;
+}
+
+#define	MUX_CONFIG_LED	(MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_NOPULL)
+#define	MUX_CONFIG_LCD	(MXS_PAD_3V3 | MXS_PAD_4MA)
+#define	MUX_CONFIG_TSC	(MXS_PAD_3V3 | MXS_PAD_8MA | MXS_PAD_PULLUP)
+#define	MUX_CONFIG_SSP0	(MXS_PAD_3V3 | MXS_PAD_12MA | MXS_PAD_PULLUP)
+#define	MUX_CONFIG_SSP2	(MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_PULLUP)
+#define	MUX_CONFIG_GPMI	(MXS_PAD_1V8 | MXS_PAD_4MA | MXS_PAD_NOPULL)
+#define	MUX_CONFIG_ENET	(MXS_PAD_3V3 | MXS_PAD_4MA | MXS_PAD_PULLUP)
+#define	MUX_CONFIG_EMI	(MXS_PAD_3V3 | MXS_PAD_12MA | MXS_PAD_NOPULL)
+
+const iomux_cfg_t iomux_setup[] = {
+	/* LED */
+	MX28_PAD_ENET0_RXD3__GPIO_4_10 | MUX_CONFIG_LED,
+
+	/* framebuffer */
+	MX28_PAD_LCD_D00__LCD_D0 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D01__LCD_D1 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D02__LCD_D2 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D03__LCD_D3 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D04__LCD_D4 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D05__LCD_D5 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D06__LCD_D6 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D07__LCD_D7 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D08__LCD_D8 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D09__LCD_D9 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D10__LCD_D10 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D11__LCD_D11 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D12__LCD_D12 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D13__LCD_D13 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D14__LCD_D14 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D15__LCD_D15 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D16__LCD_D16 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D17__LCD_D17 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D18__LCD_D18 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D19__LCD_D19 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D20__LCD_D20 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D21__LCD_D21 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D22__LCD_D22 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_D23__LCD_D23 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_RD_E__LCD_VSYNC | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_WR_RWN__LCD_HSYNC | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_RS__LCD_DOTCLK | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_CS__LCD_CS | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_VSYNC__LCD_VSYNC | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_HSYNC__LCD_HSYNC | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_DOTCLK__LCD_DOTCLK | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_ENABLE__GPIO_1_31 | MUX_CONFIG_LCD,
+	MX28_PAD_LCD_RESET__GPIO_3_30 | MUX_CONFIG_LCD,
+
+	/* UART1 */
+	MX28_PAD_PWM0__DUART_RX,
+	MX28_PAD_PWM1__DUART_TX,
+	MX28_PAD_AUART0_TX__DUART_RTS,
+	MX28_PAD_AUART0_RX__DUART_CTS,
+
+	/* UART2 */
+	MX28_PAD_AUART1_RX__AUART1_RX,
+	MX28_PAD_AUART1_TX__AUART1_TX,
+	MX28_PAD_AUART1_RTS__AUART1_RTS,
+	MX28_PAD_AUART1_CTS__AUART1_CTS,
+
+	/* CAN */
+	MX28_PAD_GPMI_RDY2__CAN0_TX,
+	MX28_PAD_GPMI_RDY3__CAN0_RX,
+
+	/* I2C */
+	MX28_PAD_I2C0_SCL__I2C0_SCL,
+	MX28_PAD_I2C0_SDA__I2C0_SDA,
+
+	/* TSC2007 */
+	MX28_PAD_SAIF0_MCLK__GPIO_3_20 | MUX_CONFIG_TSC,
+
+	/* MMC0 */
+	MX28_PAD_SSP0_DATA0__SSP0_D0 | MUX_CONFIG_SSP0,
+	MX28_PAD_SSP0_DATA1__SSP0_D1 | MUX_CONFIG_SSP0,
+	MX28_PAD_SSP0_DATA2__SSP0_D2 | MUX_CONFIG_SSP0,
+	MX28_PAD_SSP0_DATA3__SSP0_D3 | MUX_CONFIG_SSP0,
+	MX28_PAD_SSP0_DATA4__SSP0_D4 | MUX_CONFIG_SSP0,
+	MX28_PAD_SSP0_DATA5__SSP0_D5 | MUX_CONFIG_SSP0,
+	MX28_PAD_SSP0_DATA6__SSP0_D6 | MUX_CONFIG_SSP0,
+	MX28_PAD_SSP0_DATA7__SSP0_D7 | MUX_CONFIG_SSP0,
+	MX28_PAD_SSP0_CMD__SSP0_CMD | MUX_CONFIG_SSP0,
+	MX28_PAD_SSP0_DETECT__SSP0_CARD_DETECT |
+		(MXS_PAD_3V3 | MXS_PAD_12MA | MXS_PAD_NOPULL),
+	MX28_PAD_SSP0_SCK__SSP0_SCK |
+		(MXS_PAD_3V3 | MXS_PAD_12MA | MXS_PAD_NOPULL),
+	MX28_PAD_PWM3__GPIO_3_28 | MUX_CONFIG_SSP0,	/* Power .. FIXME */
+	MX28_PAD_AUART2_CTS__GPIO_3_10,	/* WP ... FIXME */
+
+	/* GPMI NAND */
+	MX28_PAD_GPMI_D00__GPMI_D0 | MUX_CONFIG_GPMI,
+	MX28_PAD_GPMI_D01__GPMI_D1 | MUX_CONFIG_GPMI,
+	MX28_PAD_GPMI_D02__GPMI_D2 | MUX_CONFIG_GPMI,
+	MX28_PAD_GPMI_D03__GPMI_D3 | MUX_CONFIG_GPMI,
+	MX28_PAD_GPMI_D04__GPMI_D4 | MUX_CONFIG_GPMI,
+	MX28_PAD_GPMI_D05__GPMI_D5 | MUX_CONFIG_GPMI,
+	MX28_PAD_GPMI_D06__GPMI_D6 | MUX_CONFIG_GPMI,
+	MX28_PAD_GPMI_D07__GPMI_D7 | MUX_CONFIG_GPMI,
+	MX28_PAD_GPMI_CE0N__GPMI_CE0N | MUX_CONFIG_GPMI,
+	MX28_PAD_GPMI_RDY0__GPMI_READY0 | MUX_CONFIG_GPMI,
+	MX28_PAD_GPMI_RDN__GPMI_RDN |
+		(MXS_PAD_1V8 | MXS_PAD_8MA | MXS_PAD_PULLUP),
+	MX28_PAD_GPMI_WRN__GPMI_WRN | MUX_CONFIG_GPMI,
+	MX28_PAD_GPMI_ALE__GPMI_ALE | MUX_CONFIG_GPMI,
+	MX28_PAD_GPMI_CLE__GPMI_CLE | MUX_CONFIG_GPMI,
+	MX28_PAD_GPMI_RESETN__GPMI_RESETN | MUX_CONFIG_GPMI,
+
+	/* FEC Ethernet */
+	MX28_PAD_ENET0_MDC__ENET0_MDC | MUX_CONFIG_ENET,
+	MX28_PAD_ENET0_MDIO__ENET0_MDIO | MUX_CONFIG_ENET,
+	MX28_PAD_ENET0_RX_EN__ENET0_RX_EN | MUX_CONFIG_ENET,
+	MX28_PAD_ENET0_TX_EN__ENET0_TX_EN | MUX_CONFIG_ENET,
+	MX28_PAD_ENET0_RXD0__ENET0_RXD0 | MUX_CONFIG_ENET,
+	MX28_PAD_ENET0_RXD1__ENET0_RXD1 | MUX_CONFIG_ENET,
+	MX28_PAD_ENET0_TXD0__ENET0_TXD0 | MUX_CONFIG_ENET,
+	MX28_PAD_ENET0_TXD1__ENET0_TXD1 | MUX_CONFIG_ENET,
+	MX28_PAD_ENET_CLK__CLKCTRL_ENET | MUX_CONFIG_ENET,
+
+	MX28_PAD_ENET0_COL__ENET1_TX_EN | MUX_CONFIG_ENET,
+	MX28_PAD_ENET0_CRS__ENET1_RX_EN | MUX_CONFIG_ENET,
+	MX28_PAD_ENET0_RXD2__ENET1_RXD0 | MUX_CONFIG_ENET,
+	MX28_PAD_ENET0_RXD3__ENET1_RXD1 | MUX_CONFIG_ENET,
+	MX28_PAD_ENET0_TXD2__ENET1_TXD0 | MUX_CONFIG_ENET,
+	MX28_PAD_ENET0_TXD3__ENET1_TXD1 | MUX_CONFIG_ENET,
+
+	/* I2C */
+	MX28_PAD_I2C0_SCL__I2C0_SCL,
+	MX28_PAD_I2C0_SDA__I2C0_SDA,
+
+	/* EMI */
+	MX28_PAD_EMI_D00__EMI_DATA0 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_D01__EMI_DATA1 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_D02__EMI_DATA2 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_D03__EMI_DATA3 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_D04__EMI_DATA4 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_D05__EMI_DATA5 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_D06__EMI_DATA6 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_D07__EMI_DATA7 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_D08__EMI_DATA8 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_D09__EMI_DATA9 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_D10__EMI_DATA10 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_D11__EMI_DATA11 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_D12__EMI_DATA12 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_D13__EMI_DATA13 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_D14__EMI_DATA14 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_D15__EMI_DATA15 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_ODT0__EMI_ODT0 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_DQM0__EMI_DQM0 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_ODT1__EMI_ODT1 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_DQM1__EMI_DQM1 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_DDR_OPEN_FB__EMI_DDR_OPEN_FEEDBACK | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_CLK__EMI_CLK | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_DQS0__EMI_DQS0 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_DQS1__EMI_DQS1 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_DDR_OPEN__EMI_DDR_OPEN | MUX_CONFIG_EMI,
+
+	MX28_PAD_EMI_A00__EMI_ADDR0 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_A01__EMI_ADDR1 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_A02__EMI_ADDR2 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_A03__EMI_ADDR3 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_A04__EMI_ADDR4 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_A05__EMI_ADDR5 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_A06__EMI_ADDR6 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_A07__EMI_ADDR7 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_A08__EMI_ADDR8 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_A09__EMI_ADDR9 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_A10__EMI_ADDR10 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_A11__EMI_ADDR11 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_A12__EMI_ADDR12 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_A13__EMI_ADDR13 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_A14__EMI_ADDR14 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_BA0__EMI_BA0 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_BA1__EMI_BA1 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_BA2__EMI_BA2 | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_CASN__EMI_CASN | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_RASN__EMI_RASN | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_WEN__EMI_WEN | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_CE0N__EMI_CE0N | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_CE1N__EMI_CE1N | MUX_CONFIG_EMI,
+	MX28_PAD_EMI_CKE__EMI_CKE | MUX_CONFIG_EMI,
+
+	/* SPI2 (for flash) */
+	MX28_PAD_SSP2_SCK__SSP2_SCK | MUX_CONFIG_SSP2,
+	MX28_PAD_SSP2_MOSI__SSP2_CMD | MUX_CONFIG_SSP2,
+	MX28_PAD_SSP2_MISO__SSP2_D0 | MUX_CONFIG_SSP2,
+	MX28_PAD_SSP2_SS0__SSP2_D3 |
+		(MXS_PAD_3V3 | MXS_PAD_8MA | MXS_PAD_PULLUP),
+};
+
+void board_init_ll(void)
+{
+	mxs_iomux_setup_multiple_pads(iomux_setup, ARRAY_SIZE(iomux_setup));
+	mx28_power_init();
+	mx28_mem_init();
+	mx28_power_wait_pswitch();
+}
+
+/* Support aparatus */
+inline void board_init_f(unsigned long bootflag)
+{
+	for (;;)
+		;
+}
+
+inline void board_init_r(gd_t *id, ulong dest_addr)
+{
+	for (;;)
+		;
+}
+
+inline int printf(const char *fmt, ...)
+{
+	return 0;
+}
+
+inline void __coloured_LED_init(void) {}
+inline void __red_LED_on(void) {}
+void coloured_LED_init(void)
+	__attribute__((weak, alias("__coloured_LED_init")));
+void red_LED_on(void)
+	__attribute__((weak, alias("__red_LED_on")));
+void hang(void) __attribute__ ((noreturn));
+void hang(void)
+{
+	for (;;)
+		;
+}

board/denx/m28evk/power_init.c

@@ -0,0 +1,913 @@
+/*
+ * Freescale i.MX28 Boot PMIC init
+ *
+ * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
+ * on behalf of DENX Software Engineering GmbH
+ *
+ * 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 <common.h>
+#include <config.h>
+#include <asm/io.h>
+#include <asm/arch/imx-regs.h>
+
+#include "m28_init.h"
+
+void mx28_power_clock2xtal(void)
+{
+	struct mx28_clkctrl_regs *clkctrl_regs =
+		(struct mx28_clkctrl_regs *)MXS_CLKCTRL_BASE;
+
+	/* Set XTAL as CPU reference clock */
+	writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
+		&clkctrl_regs->hw_clkctrl_clkseq_set);
+}
+
+void mx28_power_clock2pll(void)
+{
+	struct mx28_clkctrl_regs *clkctrl_regs =
+		(struct mx28_clkctrl_regs *)MXS_CLKCTRL_BASE;
+
+	writel(CLKCTRL_PLL0CTRL0_POWER,
+		&clkctrl_regs->hw_clkctrl_pll0ctrl0_set);
+	early_delay(100);
+	writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
+		&clkctrl_regs->hw_clkctrl_clkseq_clr);
+}
+
+void mx28_power_clear_auto_restart(void)
+{
+	struct mx28_rtc_regs *rtc_regs =
+		(struct mx28_rtc_regs *)MXS_RTC_BASE;
+
+	writel(RTC_CTRL_SFTRST, &rtc_regs->hw_rtc_ctrl_clr);
+	while (readl(&rtc_regs->hw_rtc_ctrl) & RTC_CTRL_SFTRST)
+		;
+
+	writel(RTC_CTRL_CLKGATE, &rtc_regs->hw_rtc_ctrl_clr);
+	while (readl(&rtc_regs->hw_rtc_ctrl) & RTC_CTRL_CLKGATE)
+		;
+
+	/*
+	 * Due to the hardware design bug of mx28 EVK-A
+	 * we need to set the AUTO_RESTART bit.
+	 */
+	if (readl(&rtc_regs->hw_rtc_persistent0) & RTC_PERSISTENT0_AUTO_RESTART)
+		return;
+
+	while (readl(&rtc_regs->hw_rtc_stat) & RTC_STAT_NEW_REGS_MASK)
+		;
+
+	setbits_le32(&rtc_regs->hw_rtc_persistent0,
+			RTC_PERSISTENT0_AUTO_RESTART);
+	writel(RTC_CTRL_FORCE_UPDATE, &rtc_regs->hw_rtc_ctrl_set);
+	writel(RTC_CTRL_FORCE_UPDATE, &rtc_regs->hw_rtc_ctrl_clr);
+	while (readl(&rtc_regs->hw_rtc_stat) & RTC_STAT_NEW_REGS_MASK)
+		;
+	while (readl(&rtc_regs->hw_rtc_stat) & RTC_STAT_STALE_REGS_MASK)
+		;
+}
+
+void mx28_power_set_linreg(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+
+	/* Set linear regulator 25mV below switching converter */
+	clrsetbits_le32(&power_regs->hw_power_vdddctrl,
+			POWER_VDDDCTRL_LINREG_OFFSET_MASK,
+			POWER_VDDDCTRL_LINREG_OFFSET_1STEPS_BELOW);
+
+	clrsetbits_le32(&power_regs->hw_power_vddactrl,
+			POWER_VDDACTRL_LINREG_OFFSET_MASK,
+			POWER_VDDACTRL_LINREG_OFFSET_1STEPS_BELOW);
+
+	clrsetbits_le32(&power_regs->hw_power_vddioctrl,
+			POWER_VDDIOCTRL_LINREG_OFFSET_MASK,
+			POWER_VDDIOCTRL_LINREG_OFFSET_1STEPS_BELOW);
+}
+
+void mx28_power_setup_5v_detect(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+
+	/* Start 5V detection */
+	clrsetbits_le32(&power_regs->hw_power_5vctrl,
+			POWER_5VCTRL_VBUSVALID_TRSH_MASK,
+			POWER_5VCTRL_VBUSVALID_TRSH_4V4 |
+			POWER_5VCTRL_PWRUP_VBUS_CMPS);
+}
+
+void mx28_src_power_init(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+
+	/* Improve efficieny and reduce transient ripple */
+	writel(POWER_LOOPCTRL_TOGGLE_DIF | POWER_LOOPCTRL_EN_CM_HYST |
+		POWER_LOOPCTRL_EN_DF_HYST, &power_regs->hw_power_loopctrl_set);
+
+	clrsetbits_le32(&power_regs->hw_power_dclimits,
+			POWER_DCLIMITS_POSLIMIT_BUCK_MASK,
+			0x30 << POWER_DCLIMITS_POSLIMIT_BUCK_OFFSET);
+
+	setbits_le32(&power_regs->hw_power_battmonitor,
+			POWER_BATTMONITOR_EN_BATADJ);
+
+	/* Increase the RCSCALE level for quick DCDC response to dynamic load */
+	clrsetbits_le32(&power_regs->hw_power_loopctrl,
+			POWER_LOOPCTRL_EN_RCSCALE_MASK,
+			POWER_LOOPCTRL_RCSCALE_THRESH |
+			POWER_LOOPCTRL_EN_RCSCALE_8X);
+
+	clrsetbits_le32(&power_regs->hw_power_minpwr,
+			POWER_MINPWR_HALFFETS, POWER_MINPWR_DOUBLE_FETS);
+
+	/* 5V to battery handoff ... FIXME */
+	setbits_le32(&power_regs->hw_power_5vctrl, POWER_5VCTRL_DCDC_XFER);
+	early_delay(30);
+	clrbits_le32(&power_regs->hw_power_5vctrl, POWER_5VCTRL_DCDC_XFER);
+}
+
+void mx28_power_init_4p2_params(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+
+	/* Setup 4P2 parameters */
+	clrsetbits_le32(&power_regs->hw_power_dcdc4p2,
+		POWER_DCDC4P2_CMPTRIP_MASK | POWER_DCDC4P2_TRG_MASK,
+		POWER_DCDC4P2_TRG_4V2 | (31 << POWER_DCDC4P2_CMPTRIP_OFFSET));
+
+	clrsetbits_le32(&power_regs->hw_power_5vctrl,
+		POWER_5VCTRL_HEADROOM_ADJ_MASK,
+		0x4 << POWER_5VCTRL_HEADROOM_ADJ_OFFSET);
+
+	clrsetbits_le32(&power_regs->hw_power_dcdc4p2,
+		POWER_DCDC4P2_DROPOUT_CTRL_MASK,
+		POWER_DCDC4P2_DROPOUT_CTRL_100MV |
+		POWER_DCDC4P2_DROPOUT_CTRL_SRC_SEL);
+
+	clrsetbits_le32(&power_regs->hw_power_5vctrl,
+		POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK,
+		0x3f << POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET);
+}
+
+void mx28_enable_4p2_dcdc_input(int xfer)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+	uint32_t tmp, vbus_thresh, vbus_5vdetect, pwd_bo;
+	uint32_t prev_5v_brnout, prev_5v_droop;
+
+	prev_5v_brnout = readl(&power_regs->hw_power_5vctrl) &
+				POWER_5VCTRL_PWDN_5VBRNOUT;
+	prev_5v_droop = readl(&power_regs->hw_power_ctrl) &
+				POWER_CTRL_ENIRQ_VDD5V_DROOP;
+
+	clrbits_le32(&power_regs->hw_power_5vctrl, POWER_5VCTRL_PWDN_5VBRNOUT);
+	writel(POWER_RESET_UNLOCK_KEY | POWER_RESET_PWD_OFF,
+		&power_regs->hw_power_reset);
+
+	clrbits_le32(&power_regs->hw_power_ctrl, POWER_CTRL_ENIRQ_VDD5V_DROOP);
+
+	if (xfer && (readl(&power_regs->hw_power_5vctrl) &
+			POWER_5VCTRL_ENABLE_DCDC)) {
+		return;
+	}
+
+	/*
+	 * Recording orignal values that will be modified temporarlily
+	 * to handle a chip bug. See chip errata for CQ ENGR00115837
+	 */
+	tmp = readl(&power_regs->hw_power_5vctrl);
+	vbus_thresh = tmp & POWER_5VCTRL_VBUSVALID_TRSH_MASK;
+	vbus_5vdetect = tmp & POWER_5VCTRL_VBUSVALID_5VDETECT;
+
+	pwd_bo = readl(&power_regs->hw_power_minpwr) & POWER_MINPWR_PWD_BO;
+
+	/*
+	 * Disable mechanisms that get erroneously tripped by when setting
+	 * the DCDC4P2 EN_DCDC
+	 */
+	clrbits_le32(&power_regs->hw_power_5vctrl,
+		POWER_5VCTRL_VBUSVALID_5VDETECT |
+		POWER_5VCTRL_VBUSVALID_TRSH_MASK);
+
+	writel(POWER_MINPWR_PWD_BO, &power_regs->hw_power_minpwr_set);
+
+	if (xfer) {
+		setbits_le32(&power_regs->hw_power_5vctrl,
+				POWER_5VCTRL_DCDC_XFER);
+		early_delay(20);
+		clrbits_le32(&power_regs->hw_power_5vctrl,
+				POWER_5VCTRL_DCDC_XFER);
+
+		setbits_le32(&power_regs->hw_power_5vctrl,
+				POWER_5VCTRL_ENABLE_DCDC);
+	} else {
+		setbits_le32(&power_regs->hw_power_dcdc4p2,
+				POWER_DCDC4P2_ENABLE_DCDC);
+	}
+
+	early_delay(25);
+
+	clrsetbits_le32(&power_regs->hw_power_5vctrl,
+			POWER_5VCTRL_VBUSVALID_TRSH_MASK, vbus_thresh);
+
+	if (vbus_5vdetect)
+		writel(vbus_5vdetect, &power_regs->hw_power_5vctrl_set);
+
+	if (!pwd_bo)
+		clrbits_le32(&power_regs->hw_power_minpwr, POWER_MINPWR_PWD_BO);
+
+	while (readl(&power_regs->hw_power_ctrl) & POWER_CTRL_VBUS_VALID_IRQ)
+		clrbits_le32(&power_regs->hw_power_ctrl,
+				POWER_CTRL_VBUS_VALID_IRQ);
+
+	if (prev_5v_brnout) {
+		writel(POWER_5VCTRL_PWDN_5VBRNOUT,
+			&power_regs->hw_power_5vctrl_set);
+		writel(POWER_RESET_UNLOCK_KEY,
+			&power_regs->hw_power_reset);
+	} else {
+		writel(POWER_5VCTRL_PWDN_5VBRNOUT,
+			&power_regs->hw_power_5vctrl_clr);
+		writel(POWER_RESET_UNLOCK_KEY | POWER_RESET_PWD_OFF,
+			&power_regs->hw_power_reset);
+	}
+
+	while (readl(&power_regs->hw_power_ctrl) & POWER_CTRL_VDD5V_DROOP_IRQ)
+		clrbits_le32(&power_regs->hw_power_ctrl,
+				POWER_CTRL_VDD5V_DROOP_IRQ);
+
+	if (prev_5v_droop)
+		clrbits_le32(&power_regs->hw_power_ctrl,
+				POWER_CTRL_ENIRQ_VDD5V_DROOP);
+	else
+		setbits_le32(&power_regs->hw_power_ctrl,
+				POWER_CTRL_ENIRQ_VDD5V_DROOP);
+}
+
+void mx28_power_init_4p2_regulator(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+	uint32_t tmp, tmp2;
+
+	setbits_le32(&power_regs->hw_power_dcdc4p2, POWER_DCDC4P2_ENABLE_4P2);
+
+	writel(POWER_CHARGE_ENABLE_LOAD, &power_regs->hw_power_charge_set);
+
+	writel(POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK,
+		&power_regs->hw_power_5vctrl_clr);
+	clrbits_le32(&power_regs->hw_power_dcdc4p2, POWER_DCDC4P2_TRG_MASK);
+
+	/* Power up the 4p2 rail and logic/control */
+	writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
+		&power_regs->hw_power_5vctrl_clr);
+
+	/*
+	 * Start charging up the 4p2 capacitor. We ramp of this charge
+	 * gradually to avoid large inrush current from the 5V cable which can
+	 * cause transients/problems
+	 */
+	mx28_enable_4p2_dcdc_input(0);
+
+	if (readl(&power_regs->hw_power_ctrl) & POWER_CTRL_VBUS_VALID_IRQ) {
+		/*
+		 * If we arrived here, we were unable to recover from mx23 chip
+		 * errata 5837. 4P2 is disabled and sufficient battery power is
+		 * not present. Exiting to not enable DCDC power during 5V
+		 * connected state.
+		 */
+		clrbits_le32(&power_regs->hw_power_dcdc4p2,
+			POWER_DCDC4P2_ENABLE_DCDC);
+		writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
+			&power_regs->hw_power_5vctrl_set);
+		hang();
+	}
+
+	/*
+	 * Here we set the 4p2 brownout level to something very close to 4.2V.
+	 * We then check the brownout status. If the brownout status is false,
+	 * the voltage is already close to the target voltage of 4.2V so we
+	 * can go ahead and set the 4P2 current limit to our max target limit.
+	 * If the brownout status is true, we need to ramp us the current limit
+	 * so that we don't cause large inrush current issues. We step up the
+	 * current limit until the brownout status is false or until we've
+	 * reached our maximum defined 4p2 current limit.
+	 */
+	clrsetbits_le32(&power_regs->hw_power_dcdc4p2,
+			POWER_DCDC4P2_BO_MASK,
+			22 << POWER_DCDC4P2_BO_OFFSET);	/* 4.15V */
+
+	if (!(readl(&power_regs->hw_power_sts) & POWER_STS_DCDC_4P2_BO)) {
+		setbits_le32(&power_regs->hw_power_5vctrl,
+			0x3f << POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET);
+	} else {
+		tmp = (readl(&power_regs->hw_power_5vctrl) &
+			POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK) >>
+			POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET;
+		while (tmp < 0x3f) {
+			if (!(readl(&power_regs->hw_power_sts) &
+					POWER_STS_DCDC_4P2_BO)) {
+				tmp = readl(&power_regs->hw_power_5vctrl);
+				tmp |= POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK;
+				early_delay(100);
+				writel(tmp, &power_regs->hw_power_5vctrl);
+				break;
+			} else {
+				tmp++;
+				tmp2 = readl(&power_regs->hw_power_5vctrl);
+				tmp2 &= ~POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK;
+				tmp2 |= tmp <<
+					POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET;
+				writel(tmp2, &power_regs->hw_power_5vctrl);
+				early_delay(100);
+			}
+		}
+	}
+
+	clrbits_le32(&power_regs->hw_power_dcdc4p2, POWER_DCDC4P2_BO_MASK);
+	writel(POWER_CTRL_DCDC4P2_BO_IRQ, &power_regs->hw_power_ctrl_clr);
+}
+
+void mx28_power_init_dcdc_4p2_source(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+
+	if (!(readl(&power_regs->hw_power_dcdc4p2) &
+		POWER_DCDC4P2_ENABLE_DCDC)) {
+		hang();
+	}
+
+	mx28_enable_4p2_dcdc_input(1);
+
+	if (readl(&power_regs->hw_power_ctrl) & POWER_CTRL_VBUS_VALID_IRQ) {
+		clrbits_le32(&power_regs->hw_power_dcdc4p2,
+			POWER_DCDC4P2_ENABLE_DCDC);
+		writel(POWER_5VCTRL_ENABLE_DCDC,
+			&power_regs->hw_power_5vctrl_clr);
+		writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
+			&power_regs->hw_power_5vctrl_set);
+	}
+}
+
+void mx28_power_enable_4p2(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+	uint32_t vdddctrl, vddactrl, vddioctrl;
+	uint32_t tmp;
+
+	vdddctrl = readl(&power_regs->hw_power_vdddctrl);
+	vddactrl = readl(&power_regs->hw_power_vddactrl);
+	vddioctrl = readl(&power_regs->hw_power_vddioctrl);
+
+	setbits_le32(&power_regs->hw_power_vdddctrl,
+		POWER_VDDDCTRL_DISABLE_FET | POWER_VDDDCTRL_ENABLE_LINREG |
+		POWER_VDDDCTRL_PWDN_BRNOUT);
+
+	setbits_le32(&power_regs->hw_power_vddactrl,
+		POWER_VDDACTRL_DISABLE_FET | POWER_VDDACTRL_ENABLE_LINREG |
+		POWER_VDDACTRL_PWDN_BRNOUT);
+
+	setbits_le32(&power_regs->hw_power_vddioctrl,
+		POWER_VDDIOCTRL_DISABLE_FET | POWER_VDDIOCTRL_PWDN_BRNOUT);
+
+	mx28_power_init_4p2_params();
+	mx28_power_init_4p2_regulator();
+
+	/* Shutdown battery (none present) */
+	clrbits_le32(&power_regs->hw_power_dcdc4p2, POWER_DCDC4P2_BO_MASK);
+	writel(POWER_CTRL_DCDC4P2_BO_IRQ, &power_regs->hw_power_ctrl_clr);
+	writel(POWER_CTRL_ENIRQ_DCDC4P2_BO, &power_regs->hw_power_ctrl_clr);
+
+	mx28_power_init_dcdc_4p2_source();
+
+	writel(vdddctrl, &power_regs->hw_power_vdddctrl);
+	early_delay(20);
+	writel(vddactrl, &power_regs->hw_power_vddactrl);
+	early_delay(20);
+	writel(vddioctrl, &power_regs->hw_power_vddioctrl);
+
+	/*
+	 * Check if FET is enabled on either powerout and if so,
+	 * disable load.
+	 */
+	tmp = 0;
+	tmp |= !(readl(&power_regs->hw_power_vdddctrl) &
+			POWER_VDDDCTRL_DISABLE_FET);
+	tmp |= !(readl(&power_regs->hw_power_vddactrl) &
+			POWER_VDDACTRL_DISABLE_FET);
+	tmp |= !(readl(&power_regs->hw_power_vddioctrl) &
+			POWER_VDDIOCTRL_DISABLE_FET);
+	if (tmp)
+		writel(POWER_CHARGE_ENABLE_LOAD,
+			&power_regs->hw_power_charge_clr);
+}
+
+void mx28_boot_valid_5v(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+
+	/*
+	 * Use VBUSVALID level instead of VDD5V_GT_VDDIO level to trigger a 5V
+	 * disconnect event. FIXME
+	 */
+	writel(POWER_5VCTRL_VBUSVALID_5VDETECT,
+		&power_regs->hw_power_5vctrl_set);
+
+	/* Configure polarity to check for 5V disconnection. */
+	writel(POWER_CTRL_POLARITY_VBUSVALID |
+		POWER_CTRL_POLARITY_VDD5V_GT_VDDIO,
+		&power_regs->hw_power_ctrl_clr);
+
+	writel(POWER_CTRL_VBUS_VALID_IRQ | POWER_CTRL_VDD5V_GT_VDDIO_IRQ,
+		&power_regs->hw_power_ctrl_clr);
+
+	mx28_power_enable_4p2();
+}
+
+void mx28_powerdown(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+	writel(POWER_RESET_UNLOCK_KEY, &power_regs->hw_power_reset);
+	writel(POWER_RESET_UNLOCK_KEY | POWER_RESET_PWD_OFF,
+		&power_regs->hw_power_reset);
+}
+
+void mx28_handle_5v_conflict(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+	uint32_t tmp;
+
+	setbits_le32(&power_regs->hw_power_vddioctrl,
+			POWER_VDDIOCTRL_BO_OFFSET_MASK);
+
+	for (;;) {
+		tmp = readl(&power_regs->hw_power_sts);
+
+		if (tmp & POWER_STS_VDDIO_BO) {
+			mx28_powerdown();
+			break;
+		}
+
+		if (tmp & POWER_STS_VDD5V_GT_VDDIO) {
+			mx28_boot_valid_5v();
+			break;
+		} else {
+			mx28_powerdown();
+			break;
+		}
+	}
+}
+
+int mx28_get_batt_volt(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+	uint32_t volt = readl(&power_regs->hw_power_battmonitor);
+	volt &= POWER_BATTMONITOR_BATT_VAL_MASK;
+	volt >>= POWER_BATTMONITOR_BATT_VAL_OFFSET;
+	volt *= 8;
+	return volt;
+}
+
+int mx28_is_batt_ready(void)
+{
+	return (mx28_get_batt_volt() >= 3600);
+}
+
+void mx28_5v_boot(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+
+	/*
+	 * NOTE: In original IMX-Bootlets, this also checks for VBUSVALID,
+	 * but their implementation always returns 1 so we omit it here.
+	 */
+	if (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) {
+		mx28_boot_valid_5v();
+		return;
+	}
+
+	early_delay(1000);
+	if (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) {
+		mx28_boot_valid_5v();
+		return;
+	}
+
+	mx28_handle_5v_conflict();
+}
+
+void mx28_init_batt_bo(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+
+	/* Brownout at 3V */
+	clrsetbits_le32(&power_regs->hw_power_battmonitor,
+		POWER_BATTMONITOR_BRWNOUT_LVL_MASK,
+		15 << POWER_BATTMONITOR_BRWNOUT_LVL_OFFSET);
+
+	writel(POWER_CTRL_BATT_BO_IRQ, &power_regs->hw_power_ctrl_clr);
+	writel(POWER_CTRL_ENIRQ_BATT_BO, &power_regs->hw_power_ctrl_clr);
+}
+
+void mx28_switch_vddd_to_dcdc_source(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+
+	clrsetbits_le32(&power_regs->hw_power_vdddctrl,
+		POWER_VDDDCTRL_LINREG_OFFSET_MASK,
+		POWER_VDDDCTRL_LINREG_OFFSET_1STEPS_BELOW);
+
+	clrbits_le32(&power_regs->hw_power_vdddctrl,
+		POWER_VDDDCTRL_DISABLE_FET | POWER_VDDDCTRL_ENABLE_LINREG |
+		POWER_VDDDCTRL_DISABLE_STEPPING);
+}
+
+int mx28_is_batt_good(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+	uint32_t volt;
+
+	volt = readl(&power_regs->hw_power_battmonitor);
+	volt &= POWER_BATTMONITOR_BATT_VAL_MASK;
+	volt >>= POWER_BATTMONITOR_BATT_VAL_OFFSET;
+	volt *= 8;
+
+	if ((volt >= 2400) && (volt <= 4300))
+		return 1;
+
+	clrsetbits_le32(&power_regs->hw_power_5vctrl,
+		POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK,
+		0x3 << POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET);
+	writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
+		&power_regs->hw_power_5vctrl_clr);
+
+	clrsetbits_le32(&power_regs->hw_power_charge,
+		POWER_CHARGE_STOP_ILIMIT_MASK | POWER_CHARGE_BATTCHRG_I_MASK,
+		POWER_CHARGE_STOP_ILIMIT_10MA | 0x3);
+
+	writel(POWER_CHARGE_PWD_BATTCHRG, &power_regs->hw_power_charge_clr);
+	writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
+		&power_regs->hw_power_5vctrl_clr);
+
+	early_delay(500000);
+
+	volt = readl(&power_regs->hw_power_battmonitor);
+	volt &= POWER_BATTMONITOR_BATT_VAL_MASK;
+	volt >>= POWER_BATTMONITOR_BATT_VAL_OFFSET;
+	volt *= 8;
+
+	if (volt >= 3500)
+		return 0;
+
+	if (volt >= 2400)
+		return 1;
+
+	writel(POWER_CHARGE_STOP_ILIMIT_MASK | POWER_CHARGE_BATTCHRG_I_MASK,
+		&power_regs->hw_power_charge_clr);
+	writel(POWER_CHARGE_PWD_BATTCHRG, &power_regs->hw_power_charge_set);
+
+	return 0;
+}
+
+void mx28_power_configure_power_source(void)
+{
+	mx28_src_power_init();
+
+	mx28_5v_boot();
+	mx28_power_clock2pll();
+
+	mx28_init_batt_bo();
+	mx28_switch_vddd_to_dcdc_source();
+}
+
+void mx28_enable_output_rail_protection(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+
+	writel(POWER_CTRL_VDDD_BO_IRQ | POWER_CTRL_VDDA_BO_IRQ |
+		POWER_CTRL_VDDIO_BO_IRQ, &power_regs->hw_power_ctrl_clr);
+
+	setbits_le32(&power_regs->hw_power_vdddctrl,
+			POWER_VDDDCTRL_PWDN_BRNOUT);
+
+	setbits_le32(&power_regs->hw_power_vddactrl,
+			POWER_VDDACTRL_PWDN_BRNOUT);
+
+	setbits_le32(&power_regs->hw_power_vddioctrl,
+			POWER_VDDIOCTRL_PWDN_BRNOUT);
+}
+
+int mx28_get_vddio_power_source_off(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+	uint32_t tmp;
+
+	if (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) {
+		tmp = readl(&power_regs->hw_power_vddioctrl);
+		if (tmp & POWER_VDDIOCTRL_DISABLE_FET) {
+			if ((tmp & POWER_VDDIOCTRL_LINREG_OFFSET_MASK) ==
+				POWER_VDDDCTRL_LINREG_OFFSET_0STEPS) {
+				return 1;
+			}
+		}
+
+		if (!(readl(&power_regs->hw_power_5vctrl) &
+			POWER_5VCTRL_ENABLE_DCDC)) {
+			if ((tmp & POWER_VDDIOCTRL_LINREG_OFFSET_MASK) ==
+				POWER_VDDDCTRL_LINREG_OFFSET_0STEPS) {
+				return 1;
+			}
+		}
+	}
+
+	return 0;
+
+}
+
+int mx28_get_vddd_power_source_off(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+	uint32_t tmp;
+
+	tmp = readl(&power_regs->hw_power_vdddctrl);
+	if (tmp & POWER_VDDDCTRL_DISABLE_FET) {
+		if ((tmp & POWER_VDDDCTRL_LINREG_OFFSET_MASK) ==
+			POWER_VDDDCTRL_LINREG_OFFSET_0STEPS) {
+			return 1;
+		}
+	}
+
+	if (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) {
+		if (!(readl(&power_regs->hw_power_5vctrl) &
+			POWER_5VCTRL_ENABLE_DCDC)) {
+			return 1;
+		}
+	}
+
+	if (!(tmp & POWER_VDDDCTRL_ENABLE_LINREG)) {
+		if ((tmp & POWER_VDDDCTRL_LINREG_OFFSET_MASK) ==
+			POWER_VDDDCTRL_LINREG_OFFSET_1STEPS_BELOW) {
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+void mx28_power_set_vddio(uint32_t new_target, uint32_t new_brownout)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+	uint32_t cur_target, diff, bo_int = 0;
+	uint32_t powered_by_linreg = 0;
+
+	new_brownout = new_target - new_brownout;
+
+	cur_target = readl(&power_regs->hw_power_vddioctrl);
+	cur_target &= POWER_VDDIOCTRL_TRG_MASK;
+	cur_target *= 50;	/* 50 mV step*/
+	cur_target += 2800;	/* 2800 mV lowest */
+
+	powered_by_linreg = mx28_get_vddio_power_source_off();
+	if (new_target > cur_target) {
+
+		if (powered_by_linreg) {
+			bo_int = readl(&power_regs->hw_power_vddioctrl);
+			clrbits_le32(&power_regs->hw_power_vddioctrl,
+					POWER_CTRL_ENIRQ_VDDIO_BO);
+		}
+
+		setbits_le32(&power_regs->hw_power_vddioctrl,
+				POWER_VDDIOCTRL_BO_OFFSET_MASK);
+		do {
+			if (new_target - cur_target > 100)
+				diff = cur_target + 100;
+			else
+				diff = new_target;
+
+			diff -= 2800;
+			diff /= 50;
+
+			clrsetbits_le32(&power_regs->hw_power_vddioctrl,
+				POWER_VDDIOCTRL_TRG_MASK, diff);
+
+			if (powered_by_linreg)
+				early_delay(1500);
+			else {
+				while (!(readl(&power_regs->hw_power_sts) &
+					POWER_STS_DC_OK))
+					;
+
+			}
+
+			cur_target = readl(&power_regs->hw_power_vddioctrl);
+			cur_target &= POWER_VDDIOCTRL_TRG_MASK;
+			cur_target *= 50;	/* 50 mV step*/
+			cur_target += 2800;	/* 2800 mV lowest */
+		} while (new_target > cur_target);
+
+		if (powered_by_linreg) {
+			writel(POWER_CTRL_VDDIO_BO_IRQ,
+				&power_regs->hw_power_ctrl_clr);
+			if (bo_int & POWER_CTRL_ENIRQ_VDDIO_BO)
+				setbits_le32(&power_regs->hw_power_vddioctrl,
+						POWER_CTRL_ENIRQ_VDDIO_BO);
+		}
+	} else {
+		do {
+			if (cur_target - new_target > 100)
+				diff = cur_target - 100;
+			else
+				diff = new_target;
+
+			diff -= 2800;
+			diff /= 50;
+
+			clrsetbits_le32(&power_regs->hw_power_vddioctrl,
+				POWER_VDDIOCTRL_TRG_MASK, diff);
+
+			if (powered_by_linreg)
+				early_delay(1500);
+			else {
+				while (!(readl(&power_regs->hw_power_sts) &
+					POWER_STS_DC_OK))
+					;
+
+			}
+
+			cur_target = readl(&power_regs->hw_power_vddioctrl);
+			cur_target &= POWER_VDDIOCTRL_TRG_MASK;
+			cur_target *= 50;	/* 50 mV step*/
+			cur_target += 2800;	/* 2800 mV lowest */
+		} while (new_target < cur_target);
+	}
+
+	clrsetbits_le32(&power_regs->hw_power_vddioctrl,
+			POWER_VDDDCTRL_BO_OFFSET_MASK,
+			new_brownout << POWER_VDDDCTRL_BO_OFFSET_OFFSET);
+}
+
+void mx28_power_set_vddd(uint32_t new_target, uint32_t new_brownout)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+	uint32_t cur_target, diff, bo_int = 0;
+	uint32_t powered_by_linreg = 0;
+
+	new_brownout = new_target - new_brownout;
+
+	cur_target = readl(&power_regs->hw_power_vdddctrl);
+	cur_target &= POWER_VDDDCTRL_TRG_MASK;
+	cur_target *= 25;	/* 25 mV step*/
+	cur_target += 800;	/* 800 mV lowest */
+
+	powered_by_linreg = mx28_get_vddd_power_source_off();
+	if (new_target > cur_target) {
+		if (powered_by_linreg) {
+			bo_int = readl(&power_regs->hw_power_vdddctrl);
+			clrbits_le32(&power_regs->hw_power_vdddctrl,
+					POWER_CTRL_ENIRQ_VDDD_BO);
+		}
+
+		setbits_le32(&power_regs->hw_power_vdddctrl,
+				POWER_VDDDCTRL_BO_OFFSET_MASK);
+
+		do {
+			if (new_target - cur_target > 100)
+				diff = cur_target + 100;
+			else
+				diff = new_target;
+
+			diff -= 800;
+			diff /= 25;
+
+			clrsetbits_le32(&power_regs->hw_power_vdddctrl,
+				POWER_VDDDCTRL_TRG_MASK, diff);
+
+			if (powered_by_linreg)
+				early_delay(1500);
+			else {
+				while (!(readl(&power_regs->hw_power_sts) &
+					POWER_STS_DC_OK))
+					;
+
+			}
+
+			cur_target = readl(&power_regs->hw_power_vdddctrl);
+			cur_target &= POWER_VDDDCTRL_TRG_MASK;
+			cur_target *= 25;	/* 25 mV step*/
+			cur_target += 800;	/* 800 mV lowest */
+		} while (new_target > cur_target);
+
+		if (powered_by_linreg) {
+			writel(POWER_CTRL_VDDD_BO_IRQ,
+				&power_regs->hw_power_ctrl_clr);
+			if (bo_int & POWER_CTRL_ENIRQ_VDDD_BO)
+				setbits_le32(&power_regs->hw_power_vdddctrl,
+						POWER_CTRL_ENIRQ_VDDD_BO);
+		}
+	} else {
+		do {
+			if (cur_target - new_target > 100)
+				diff = cur_target - 100;
+			else
+				diff = new_target;
+
+			diff -= 800;
+			diff /= 25;
+
+			clrsetbits_le32(&power_regs->hw_power_vdddctrl,
+					POWER_VDDDCTRL_TRG_MASK, diff);
+
+			if (powered_by_linreg)
+				early_delay(1500);
+			else {
+				while (!(readl(&power_regs->hw_power_sts) &
+					POWER_STS_DC_OK))
+					;
+
+			}
+
+			cur_target = readl(&power_regs->hw_power_vdddctrl);
+			cur_target &= POWER_VDDDCTRL_TRG_MASK;
+			cur_target *= 25;	/* 25 mV step*/
+			cur_target += 800;	/* 800 mV lowest */
+		} while (new_target < cur_target);
+	}
+
+	clrsetbits_le32(&power_regs->hw_power_vdddctrl,
+			POWER_VDDDCTRL_BO_OFFSET_MASK,
+			new_brownout << POWER_VDDDCTRL_BO_OFFSET_OFFSET);
+}
+
+void mx28_power_init(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+
+	mx28_power_clock2xtal();
+	mx28_power_clear_auto_restart();
+	mx28_power_set_linreg();
+	mx28_power_setup_5v_detect();
+	mx28_power_configure_power_source();
+	mx28_enable_output_rail_protection();
+
+	mx28_power_set_vddio(3300, 3150);
+
+	mx28_power_set_vddd(1350, 1200);
+
+	writel(POWER_CTRL_VDDD_BO_IRQ | POWER_CTRL_VDDA_BO_IRQ |
+		POWER_CTRL_VDDIO_BO_IRQ | POWER_CTRL_VDD5V_DROOP_IRQ |
+		POWER_CTRL_VBUS_VALID_IRQ | POWER_CTRL_BATT_BO_IRQ |
+		POWER_CTRL_DCDC4P2_BO_IRQ, &power_regs->hw_power_ctrl_clr);
+
+	writel(POWER_5VCTRL_PWDN_5VBRNOUT, &power_regs->hw_power_5vctrl_set);
+
+	early_delay(1000);
+}
+
+#ifdef	CONFIG_SPL_MX28_PSWITCH_WAIT
+void mx28_power_wait_pswitch(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+
+	while (!(readl(&power_regs->hw_power_sts) & POWER_STS_PSWITCH_MASK))
+		;
+}
+#endif

board/denx/m28evk/start.S

@@ -0,0 +1,396 @@
+/*
+ *  armboot - Startup Code for ARM926EJS CPU-core
+ *
+ *  Copyright (c) 2003  Texas Instruments
+ *
+ *  ----- Adapted for OMAP1610 OMAP730 from ARM925t code ------
+ *
+ *  Copyright (c) 2001	Marius Groger <mag@sysgo.de>
+ *  Copyright (c) 2002	Alex Zupke <azu@sysgo.de>
+ *  Copyright (c) 2002	Gary Jennejohn <garyj@denx.de>
+ *  Copyright (c) 2003	Richard Woodruff <r-woodruff2@ti.com>
+ *  Copyright (c) 2003	Kshitij <kshitij@ti.com>
+ *  Copyright (c) 2010	Albert Aribaud <albert.u.boot@aribaud.net>
+ *
+ * Change to support call back into iMX28 bootrom
+ * Copyright (c) 2011 Marek Vasut <marek.vasut@gmail.com>
+ * on behalf of DENX Software Engineering GmbH
+ *
+ * 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-offsets.h>
+#include <config.h>
+#include <common.h>
+#include <version.h>
+
+#if defined(CONFIG_OMAP1610)
+#include <./configs/omap1510.h>
+#elif defined(CONFIG_OMAP730)
+#include <./configs/omap730.h>
+#endif
+
+/*
+ *************************************************************************
+ *
+ * Jump vector table as in table 3.1 in [1]
+ *
+ *************************************************************************
+ */
+
+
+.globl _start
+_start:
+	b	reset
+#ifdef CONFIG_SPL_BUILD
+/* No exception handlers in preloader */
+	ldr	pc, _hang
+	ldr	pc, _hang
+	ldr	pc, _hang
+	ldr	pc, _hang
+	b	reset
+	ldr	pc, _hang
+	ldr	pc, _hang
+
+_hang:
+	.word	do_hang
+/* pad to 64 byte boundary */
+	.word	0x12345678
+	.word	0x12345678
+	.word	0x12345678
+	.word	0x12345678
+	.word	0x12345678
+	.word	0x12345678
+	.word	0x12345678
+#else
+	ldr	pc, _undefined_instruction
+	ldr	pc, _software_interrupt
+	ldr	pc, _prefetch_abort
+	ldr	pc, _data_abort
+	ldr	pc, _not_used
+	ldr	pc, _irq
+	ldr	pc, _fiq
+
+_undefined_instruction:
+	.word undefined_instruction
+_software_interrupt:
+	.word software_interrupt
+_prefetch_abort:
+	.word prefetch_abort
+_data_abort:
+	.word data_abort
+_not_used:
+	.word not_used
+_irq:
+	.word irq
+_fiq:
+	.word fiq
+
+#endif	/* CONFIG_SPL_BUILD */
+	.balignl 16,0xdeadbeef
+
+
+/*
+ *************************************************************************
+ *
+ * Startup Code (reset vector)
+ *
+ * do important init only if we don't start from memory!
+ * setup Memory and board specific bits prior to relocation.
+ * relocate armboot to ram
+ * setup stack
+ *
+ *************************************************************************
+ */
+
+.globl _TEXT_BASE
+_TEXT_BASE:
+	.word	CONFIG_SYS_TEXT_BASE
+
+/*
+ * These are defined in the board-specific linker script.
+ * Subtracting _start from them lets the linker put their
+ * relative position in the executable instead of leaving
+ * them null.
+ */
+.globl _bss_start_ofs
+_bss_start_ofs:
+	.word __bss_start - _start
+
+.globl _bss_end_ofs
+_bss_end_ofs:
+	.word __bss_end__ - _start
+
+.globl _end_ofs
+_end_ofs:
+	.word _end - _start
+
+#ifdef CONFIG_USE_IRQ
+/* IRQ stack memory (calculated at run-time) */
+.globl IRQ_STACK_START
+IRQ_STACK_START:
+	.word	0x0badc0de
+
+/* IRQ stack memory (calculated at run-time) */
+.globl FIQ_STACK_START
+FIQ_STACK_START:
+	.word 0x0badc0de
+#endif
+
+/* IRQ stack memory (calculated at run-time) + 8 bytes */
+.globl IRQ_STACK_START_IN
+IRQ_STACK_START_IN:
+	.word	0x0badc0de
+
+/*
+ * the actual reset code
+ */
+
+reset:
+	/*
+	 * Store all registers on old stack pointer, this will allow us later to
+	 * return to the BootROM and let the BootROM load U-Boot into RAM.
+	 */
+	push	{r0-r12,r14}
+
+	/*
+	 * set the cpu to SVC32 mode
+	 */
+	mrs	r0,cpsr
+	bic	r0,r0,#0x1f
+	orr	r0,r0,#0xd3
+	msr	cpsr,r0
+
+	/*
+	 * we do sys-critical inits only at reboot,
+	 * not when booting from ram!
+	 */
+#ifndef CONFIG_SKIP_LOWLEVEL_INIT
+	bl	cpu_init_crit
+#endif
+
+	bl	board_init_ll
+
+	pop	{r0-r12,r14}
+	bx	lr
+
+/*
+ *************************************************************************
+ *
+ * CPU_init_critical registers
+ *
+ * setup important registers
+ * setup memory timing
+ *
+ *************************************************************************
+ */
+#ifndef CONFIG_SKIP_LOWLEVEL_INIT
+cpu_init_crit:
+	/*
+	 * flush v4 I/D caches
+	 */
+	mov	r0, #0
+	mcr	p15, 0, r0, c7, c7, 0	/* flush v3/v4 cache */
+	mcr	p15, 0, r0, c8, c7, 0	/* flush v4 TLB */
+
+	/*
+	 * disable MMU stuff and caches
+	 */
+	mrc	p15, 0, r0, c1, c0, 0
+	bic	r0, r0, #0x00002300	/* clear bits 13, 9:8 (--V- --RS) */
+	bic	r0, r0, #0x00000087	/* clear bits 7, 2:0 (B--- -CAM) */
+	orr	r0, r0, #0x00000002	/* set bit 2 (A) Align */
+	orr	r0, r0, #0x00001000	/* set bit 12 (I) I-Cache */
+	mcr	p15, 0, r0, c1, c0, 0
+
+	mov	pc, lr		/* back to my caller */
+#endif /* CONFIG_SKIP_LOWLEVEL_INIT */
+
+#ifndef CONFIG_SPL_BUILD
+/*
+ *************************************************************************
+ *
+ * Interrupt handling
+ *
+ *************************************************************************
+ */
+
+@
+@ IRQ stack frame.
+@
+#define S_FRAME_SIZE	72
+
+#define S_OLD_R0	68
+#define S_PSR		64
+#define S_PC		60
+#define S_LR		56
+#define S_SP		52
+
+#define S_IP		48
+#define S_FP		44
+#define S_R10		40
+#define S_R9		36
+#define S_R8		32
+#define S_R7		28
+#define S_R6		24
+#define S_R5		20
+#define S_R4		16
+#define S_R3		12
+#define S_R2		8
+#define S_R1		4
+#define S_R0		0
+
+#define MODE_SVC 0x13
+#define I_BIT	 0x80
+
+/*
+ * use bad_save_user_regs for abort/prefetch/undef/swi ...
+ * use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling
+ */
+
+	.macro	bad_save_user_regs
+	@ carve out a frame on current user stack
+	sub	sp, sp, #S_FRAME_SIZE
+	stmia	sp, {r0 - r12}	@ Save user registers (now in svc mode) r0-r12
+	ldr	r2, IRQ_STACK_START_IN
+	@ get values for "aborted" pc and cpsr (into parm regs)
+	ldmia	r2, {r2 - r3}
+	add	r0, sp, #S_FRAME_SIZE		@ grab pointer to old stack
+	add	r5, sp, #S_SP
+	mov	r1, lr
+	stmia	r5, {r0 - r3}	@ save sp_SVC, lr_SVC, pc, cpsr
+	mov	r0, sp		@ save current stack into r0 (param register)
+	.endm
+
+	.macro	irq_save_user_regs
+	sub	sp, sp, #S_FRAME_SIZE
+	stmia	sp, {r0 - r12}			@ Calling r0-r12
+	@ !!!! R8 NEEDS to be saved !!!! a reserved stack spot would be good.
+	add	r8, sp, #S_PC
+	stmdb	r8, {sp, lr}^		@ Calling SP, LR
+	str	lr, [r8, #0]		@ Save calling PC
+	mrs	r6, spsr
+	str	r6, [r8, #4]		@ Save CPSR
+	str	r0, [r8, #8]		@ Save OLD_R0
+	mov	r0, sp
+	.endm
+
+	.macro	irq_restore_user_regs
+	ldmia	sp, {r0 - lr}^			@ Calling r0 - lr
+	mov	r0, r0
+	ldr	lr, [sp, #S_PC]			@ Get PC
+	add	sp, sp, #S_FRAME_SIZE
+	subs	pc, lr, #4		@ return & move spsr_svc into cpsr
+	.endm
+
+	.macro get_bad_stack
+	ldr	r13, IRQ_STACK_START_IN		@ setup our mode stack
+
+	str	lr, [r13]	@ save caller lr in position 0 of saved stack
+	mrs	lr, spsr	@ get the spsr
+	str	lr, [r13, #4]	@ save spsr in position 1 of saved stack
+	mov	r13, #MODE_SVC	@ prepare SVC-Mode
+	@ msr	spsr_c, r13
+	msr	spsr, r13	@ switch modes, make sure moves will execute
+	mov	lr, pc		@ capture return pc
+	movs	pc, lr		@ jump to next instruction & switch modes.
+	.endm
+
+	.macro get_irq_stack			@ setup IRQ stack
+	ldr	sp, IRQ_STACK_START
+	.endm
+
+	.macro get_fiq_stack			@ setup FIQ stack
+	ldr	sp, FIQ_STACK_START
+	.endm
+#endif	/* CONFIG_SPL_BUILD */
+
+/*
+ * exception handlers
+ */
+#ifdef CONFIG_SPL_BUILD
+	.align	5
+do_hang:
+	ldr	sp, _TEXT_BASE			/* switch to abort stack */
+1:
+	bl	1b				/* hang and never return */
+#else	/* !CONFIG_SPL_BUILD */
+	.align  5
+undefined_instruction:
+	get_bad_stack
+	bad_save_user_regs
+	bl	do_undefined_instruction
+
+	.align	5
+software_interrupt:
+	get_bad_stack
+	bad_save_user_regs
+	bl	do_software_interrupt
+
+	.align	5
+prefetch_abort:
+	get_bad_stack
+	bad_save_user_regs
+	bl	do_prefetch_abort
+
+	.align	5
+data_abort:
+	get_bad_stack
+	bad_save_user_regs
+	bl	do_data_abort
+
+	.align	5
+not_used:
+	get_bad_stack
+	bad_save_user_regs
+	bl	do_not_used
+
+#ifdef CONFIG_USE_IRQ
+
+	.align	5
+irq:
+	get_irq_stack
+	irq_save_user_regs
+	bl	do_irq
+	irq_restore_user_regs
+
+	.align	5
+fiq:
+	get_fiq_stack
+	/* someone ought to write a more effiction fiq_save_user_regs */
+	irq_save_user_regs
+	bl	do_fiq
+	irq_restore_user_regs
+
+#else
+
+	.align	5
+irq:
+	get_bad_stack
+	bad_save_user_regs
+	bl	do_irq
+
+	.align	5
+fiq:
+	get_bad_stack
+	bad_save_user_regs
+	bl	do_fiq
+
+#endif
+#endif	/* CONFIG_SPL_BUILD */

board/denx/m28evk/u-boot-spl.lds

@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
+ * on behalf of DENX Software Engineering GmbH
+ *
+ * January 2004 - Changed to support H4 device
+ * Copyright (c) 2004-2008 Texas Instruments
+ *
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
+ *
+ * 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
+ */
+
+OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm")
+OUTPUT_ARCH(arm)
+ENTRY(_start)
+SECTIONS
+{
+	. = 0x00000000;
+
+	. = ALIGN(4);
+	.text	:
+	{
+		board/denx/m28evk/start.o	(.text)
+		*(.text)
+	}
+
+	. = ALIGN(4);
+	.rodata : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) }
+
+	. = ALIGN(4);
+	.data : {
+		*(.data)
+	}
+
+	. = ALIGN(4);
+	__u_boot_cmd_start = .;
+	.u_boot_cmd : { *(.u_boot_cmd) }
+	__u_boot_cmd_end = .;
+
+	. = ALIGN(4);
+
+	.rel.dyn : {
+		__rel_dyn_start = .;
+		*(.rel*)
+		__rel_dyn_end = .;
+	}
+
+	.dynsym : {
+		__dynsym_start = .;
+		*(.dynsym)
+	}
+
+	_end = .;
+
+	.bss __rel_dyn_start (OVERLAY) : {
+		__bss_start = .;
+		*(.bss)
+		 . = ALIGN(4);
+		__bss_end__ = .;
+	}
+
+	/DISCARD/ : { *(.bss*) }
+	/DISCARD/ : { *(.dynstr*) }
+	/DISCARD/ : { *(.dynsym*) }
+	/DISCARD/ : { *(.dynamic*) }
+	/DISCARD/ : { *(.hash*) }
+	/DISCARD/ : { *(.plt*) }
+	/DISCARD/ : { *(.interp*) }
+	/DISCARD/ : { *(.gnu*) }
+}

board/denx/m28evk/u-boot.bd

@@ -0,0 +1,14 @@
+sources {
+	u_boot_spl="spl/u-boot-spl.bin";
+	u_boot="u-boot.bin";
+}
+
+section (0) {
+        load u_boot_spl > 0x0000;
+        load ivt (entry = 0x0014) > 0x8000;
+	hab call 0x8000;
+
+        load u_boot > 0x40000100;
+        load ivt (entry = 0x40000100) > 0x8000;
+	hab call 0x8000;
+}

include/configs/m28evk.h

@@ -43,6 +43,14 @@
 #define	CONFIG_ARCH_CPU_INIT
 
 /*
+ * SPL
+ */
+#define	CONFIG_SPL
+#define	CONFIG_SPL_NO_CPU_SUPPORT_CODE
+#define	CONFIG_SPL_START_S_PATH		"board/denx/m28evk"
+#define	CONFIG_SPL_LDSCRIPT		"board/denx/m28evk/u-boot-spl.lds"
+
+/*
  * U-Boot Commands
  */
 #include <config_cmd_default.h>