mpc5200: Add a3m071 board support

This patch adds support for the a3m071 board based on the
MPC5200.

Signed-off-by: Stefan Roese <sr@denx.de>

4 files changed, 483 insertions, 0 deletions

diff --git a/board/a3m071/Makefile b/board/a3m071/Makefile
new file mode 100644
index 0000000..6f961fb
--- /dev/null
+++ b/board/a3m071/Makefile
@@ -0,0 +1,36 @@
+#
+# 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.
+#
+
+include $(TOPDIR)/config.mk
+
+LIB	= $(obj)lib$(BOARD).o
+
+COBJS	:= $(BOARD).o
+
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SOBJS	:= $(addprefix $(obj),$(SOBJS))
+
+$(LIB):	$(obj).depend $(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/board/a3m071/README b/board/a3m071/README
new file mode 100644
index 0000000..7698614
--- /dev/null
+++ b/board/a3m071/README
@@ -0,0 +1,80 @@
+------------------------------------------------------------------------
+A3M071 board support
+------------------------------------------------------------------------
+
+
+SPL NOR flash support:
+----------------------
+To boot fast into the OS (Linux), this board port integrates the SPL
+framework. This means, that a special, stripped-down version of
+U-Boot runs in the beginning. In the case of the A3M071 board, this
+SPL U-Boot version is less than 16 KiB big. This SPL U-Boot can either
+boot the OS (Linux) or a "real", full-blown U-Boot. This detection
+on whether to boot Linux or U-Boot is done by using the "boot_os"
+environment variable. If "boot_os" is set to "yes", Linux will be
+loaded and booted from the SPL U-Boot version. Otherwise, the
+full-blown U-Boot version will be loaded and run.
+
+Enabling Linux booting:
+-----------------------
+From U-Boot:
+=> setenv boot_os yes
+=> saveenv
+
+From Linux:
+$ fw_setenv boot_os yes
+
+Enabling U-Boot booting:
+------------------------
+From U-Boot:
+=> setenv boot_os no
+=> saveenv
+
+From Linux:
+$ fw_setenv boot_os no
+
+
+Preparing Linux image(s) for booting from SPL U-Boot:
+-----------------------------------------------------
+To boot the Linux kernel from the SPL, the DT blob (fdt) needs to get
+prepard/patched first. U-Boot usually inserts some dynamic values into
+the DT binary (blob), e.g. autodetected memory size, MAC addresses,
+clocks speeds etc. To generate this patched DT blob, you can use
+the following command:
+
+1. Load fdt blob to SDRAM:
+=> tftp 1800000 a3m071/a3m071.dtb
+
+2. Set bootargs as desired for Linux booting (e.g. flash_mtd):
+=> run mtdargs addip2 addtty
+
+3. Use "fdt" commands to patch the DT blob:
+=> fdt addr 1800000
+=> fdt boardsetup
+=> fdt chosen
+
+4. Display patched DT blob (optional):
+=> fdt print
+
+5. Save fdt to NOR flash:
+=> erase fc060000 fc07ffff
+=> cp.b 1800000 fc060000 10000
+
+All this can be integrated into an environment command:
+=> setenv upd_fdt 'tftp 1800000 a3m071/a3m071.dtb;run mtdargs addip2 addtty; \
+	fdt addr 1800000;fdt boardsetup;erase fc060000 fc07ffff; \
+	cp.b 1800000 fc060000 10000'
+=> saveenv
+
+After this, only "run upd_fdt" needs to get called to load, patch
+and save the DT blob into NOR flash.
+
+Additionally, the Linux kernel image has to be saved uncompressed in
+its uImage file (and not gzip compressed). This can be done with this
+command:
+
+$ mkimage -A ppc -O linux -T kernel -C none -a 0 -e 0 \
+	-n "Linux Kernel Image" -d vmlinux.bin uImage.uncompressed
+
+------------------------------------------------------------------------
+Stefan Roese, 2012-08-23
diff --git a/board/a3m071/a3m071.c b/board/a3m071/a3m071.c
new file mode 100644
index 0000000..89ced82
--- /dev/null
+++ b/board/a3m071/a3m071.c
@@ -0,0 +1,335 @@
+/*
+ * (C) Copyright 2003-2004
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2004
+ * Mark Jonas, Freescale Semiconductor, mark.jonas@motorola.com.
+ *
+ * (C) Copyright 2006
+ * MicroSys GmbH
+ *
+ * Copyright 2012 Stefan Roese <sr@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.
+ */
+
+#include <common.h>
+#include <command.h>
+#include <mpc5xxx.h>
+#include <pci.h>
+#include <miiphy.h>
+#include <asm/processor.h>
+#include <asm/io.h>
+
+#include "mt46v16m16-75.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#if !defined(CONFIG_SYS_RAMBOOT) && \
+	(defined(CONFIG_SPL) && defined(CONFIG_SPL_BUILD))
+static void sdram_start(int hi_addr)
+{
+	long hi_addr_bit = hi_addr ? 0x01000000 : 0;
+	long control = SDRAM_CONTROL | hi_addr_bit;
+
+	/* unlock mode register */
+	out_be32((void *)MPC5XXX_SDRAM_CTRL, control | 0x80000000);
+
+	/* precharge all banks */
+	out_be32((void *)MPC5XXX_SDRAM_CTRL, control | 0x80000002);
+
+#ifdef SDRAM_DDR
+	/* set mode register: extended mode */
+	out_be32((void *)MPC5XXX_SDRAM_MODE, SDRAM_EMODE);
+
+	/* set mode register: reset DLL */
+	out_be32((void *)MPC5XXX_SDRAM_MODE, SDRAM_MODE | 0x04000000);
+#endif
+
+	/* precharge all banks */
+	out_be32((void *)MPC5XXX_SDRAM_CTRL, control | 0x80000002);
+
+	/* auto refresh */
+	out_be32((void *)MPC5XXX_SDRAM_CTRL, control | 0x80000004);
+
+	/* set mode register */
+	out_be32((void *)MPC5XXX_SDRAM_MODE, SDRAM_MODE);
+
+	/* normal operation */
+	out_be32((void *)MPC5XXX_SDRAM_CTRL, control);
+}
+#endif
+
+/*
+ * ATTENTION: Although partially referenced initdram does NOT make real use
+ * use of CONFIG_SYS_SDRAM_BASE. The code does not work if
+ * CONFIG_SYS_SDRAM_BASE is something else than 0x00000000.
+ */
+phys_size_t initdram(int board_type)
+{
+	ulong dramsize = 0;
+	ulong dramsize2 = 0;
+	uint svr, pvr;
+#if !defined(CONFIG_SYS_RAMBOOT) && \
+	(defined(CONFIG_SPL) && defined(CONFIG_SPL_BUILD))
+	ulong test1, test2;
+
+	/* setup SDRAM chip selects */
+	out_be32((void *)MPC5XXX_SDRAM_CS0CFG, 0x0000001e);	/* 2GB at 0x0 */
+	out_be32((void *)MPC5XXX_SDRAM_CS1CFG, 0x80000000);	/* disabled */
+
+	/* setup config registers */
+	out_be32((void *)MPC5XXX_SDRAM_CONFIG1, SDRAM_CONFIG1);
+	out_be32((void *)MPC5XXX_SDRAM_CONFIG2, SDRAM_CONFIG2);
+
+#ifdef SDRAM_DDR
+	/* set tap delay */
+	out_be32((void *)MPC5XXX_CDM_PORCFG, SDRAM_TAPDELAY);
+#endif
+
+	/* find RAM size using SDRAM CS0 only */
+	sdram_start(0);
+	test1 = get_ram_size((long *)CONFIG_SYS_SDRAM_BASE, 0x80000000);
+	sdram_start(1);
+	test2 = get_ram_size((long *)CONFIG_SYS_SDRAM_BASE, 0x80000000);
+	if (test1 > test2) {
+		sdram_start(0);
+		dramsize = test1;
+	} else {
+		dramsize = test2;
+	}
+
+	/* memory smaller than 1MB is impossible */
+	if (dramsize < (1 << 20))
+		dramsize = 0;
+
+	/* set SDRAM CS0 size according to the amount of RAM found */
+	if (dramsize > 0) {
+		out_be32((void *)MPC5XXX_SDRAM_CS0CFG,
+			 0x13 + __builtin_ffs(dramsize >> 20) - 1);
+	} else {
+		out_be32((void *)MPC5XXX_SDRAM_CS0CFG, 0);	/* disabled */
+	}
+#else /* CONFIG_SYS_RAMBOOT */
+
+	/* retrieve size of memory connected to SDRAM CS0 */
+	dramsize = in_be32((void *)MPC5XXX_SDRAM_CS0CFG) & 0xFF;
+	if (dramsize >= 0x13)
+		dramsize = (1 << (dramsize - 0x13)) << 20;
+	else
+		dramsize = 0;
+
+	/* retrieve size of memory connected to SDRAM CS1 */
+	dramsize2 = in_be32((void *)MPC5XXX_SDRAM_CS1CFG) & 0xFF;
+	if (dramsize2 >= 0x13)
+		dramsize2 = (1 << (dramsize2 - 0x13)) << 20;
+	else
+		dramsize2 = 0;
+
+#endif /* CONFIG_SYS_RAMBOOT */
+
+	/*
+	 * On MPC5200B we need to set the special configuration delay in the
+	 * DDR controller. Please refer to Freescale's AN3221 "MPC5200B SDRAM
+	 * Initialization and Configuration", 3.3.1 SDelay--MBAR + 0x0190:
+	 *
+	 * "The SDelay should be written to a value of 0x00000004. It is
+	 * required to account for changes caused by normal wafer processing
+	 * parameters."
+	 */
+	svr = get_svr();
+	pvr = get_pvr();
+	if ((SVR_MJREV(svr) >= 2) && (PVR_MAJ(pvr) == 1) && (PVR_MIN(pvr) == 4))
+		out_be32((void *)MPC5XXX_SDRAM_SDELAY, 0x04);
+
+	return dramsize + dramsize2;
+}
+
+static void get_revisions(int *failsavelevel, int *digiboardversion,
+	int *fpgaversion)
+{
+	struct mpc5xxx_gpt_0_7 *gpt = (struct mpc5xxx_gpt_0_7 *)MPC5XXX_GPT;
+	u8 val;
+
+	/*
+	 * Figure out failsavelevel
+	 * see ticket dsvk#59
+	 */
+	*failsavelevel = 0;	/* 0=failsave, 1=board ok, 2=fpga ok */
+
+	/* read digitalboard-version from TMR[2..4] */
+	val = 0;
+	val |= (gpt->gpt2.sr & (1 << (31 - 23))) ? (1) : 0;
+	val |= (gpt->gpt3.sr & (1 << (31 - 23))) ? (1 << 1) : 0;
+	val |= (gpt->gpt4.sr & (1 << (31 - 23))) ? (1 << 2) : 0;
+	*digiboardversion = val;
+
+	if (*digiboardversion == 0) {
+		*failsavelevel = 1;	/* digiboard-version ok */
+
+		/* read fpga-version from TMR[5..7] */
+		val = 0;
+		val |= (gpt->gpt5.sr & (1 << (31 - 23))) ? (1) : 0;
+		val |= (gpt->gpt6.sr & (1 << (31 - 23))) ? (1 << 1) : 0;
+		val |= (gpt->gpt7.sr & (1 << (31 - 23))) ? (1 << 2) : 0;
+		*fpgaversion = val;
+
+		if (*fpgaversion == 1)
+			*failsavelevel = 2;	/* fpga-version ok */
+	}
+}
+
+/*
+ * This function is called from the SPL U-Boot version for
+ * early init stuff, that needs to be done for OS (e.g. Linux)
+ * booting. Doing it later in the real U-Boot would not work
+ * in case that the SPL U-Boot boots Linux directly.
+ */
+void spl_board_init(void)
+{
+	struct mpc5xxx_gpio *gpio = (struct mpc5xxx_gpio *)MPC5XXX_GPIO;
+	struct mpc5xxx_mmap_ctl *mm =
+		(struct mpc5xxx_mmap_ctl *)CONFIG_SYS_MBAR;
+	int digiboardversion;
+	int failsavelevel;
+	int fpgaversion;
+	u32 val;
+
+	get_revisions(&failsavelevel, &digiboardversion, &fpgaversion);
+
+	val = in_be32(&mm->ipbi_ws_ctrl);
+
+	/* first clear bits 19..21 (CS3...5) */
+	val &= ~((1 << 19) | (1 << 20) | (1 << 21));
+	if (failsavelevel == 2) {
+		/* FPGA ok */
+		val |= (1 << 19) | (1 << 21);
+	}
+
+	if (failsavelevel >= 1) {
+		/* at least digiboard-version ok */
+		val |= (1 << 20);
+	}
+
+	/* And write new value back to register */
+	out_be32(&mm->ipbi_ws_ctrl, val);
+
+	/*
+	 * No need to change the pin multiplexing (MPC5XXX_GPS_PORT_CONFIG)
+	 * as all 3 config versions (failsave level) have the same setup.
+	 */
+
+	/*
+	 * Setup gpio_wkup_7 as watchdog AS INPUT to disable it - see
+	 * ticket #60
+	 *
+	 * MPC5XXX_WU_GPIO_DIR direction is already 0 (INPUT)
+	 * set bit 0(msb) to 1
+	 */
+	setbits_be32((void *)MPC5XXX_WU_GPIO_ENABLE, 1 << (31 - 0));
+
+	/* setup GPIOs for status-leds if needed - see ticket #57 */
+	if (failsavelevel > 0) {
+		/* digiboard-version is OK */
+		/* LED is LOW ACTIVE - so deactivate by set output to 1 */
+		gpio->simple_dvo |= 1 << (31 - 12);
+		gpio->simple_dvo |= 1 << (31 - 13);
+		/* set GPIO direction to output */
+		gpio->simple_ddr |= 1 << (31 - 12);
+		gpio->simple_ddr |= 1 << (31 - 13);
+		/* open drain config is set to "normal output" at reset */
+		/* gpio->simple_ode &=~ ( 1 << (31-12) ); */
+		/* gpio->simple_ode &=~ ( 1 << (31-13) ); */
+		/* enable as GPIO */
+		gpio->simple_gpioe |= 1 << (31 - 12);
+		gpio->simple_gpioe |= 1 << (31 - 13);
+	}
+
+	/* setup fpga irq - see ticket #65 */
+	if (failsavelevel > 1) {
+		/*
+		 * The main irq initialisation is done in interrupts.c
+		 * mpc5xxx_init_irq
+		 */
+		struct mpc5xxx_intr *intr =
+		    (struct mpc5xxx_intr *)(MPC5XXX_ICTL);
+
+		setbits_be32(&intr->ctrl, 0x08C01801);
+
+		/*
+		 * The MBAR+0x0524 Bit 21:23 CSe are ignored here due to the
+		 * already cleared (intr_ctrl) MBAR+0x0510 ECLR[0] bit above
+		 */
+	}
+
+}
+
+int checkboard(void)
+{
+	int digiboardversion;
+	int failsavelevel;
+	int fpgaversion;
+
+	get_revisions(&failsavelevel, &digiboardversion, &fpgaversion);
+
+	puts("Board: A3M071\n");
+	printf("Rev:   failsave level       %u\n", failsavelevel);
+	printf("       digiboard IO version %u\n", digiboardversion);
+	if (failsavelevel > 0)	/* only if fpga-version red */
+		printf("       fpga IO version      %u\n", fpgaversion);
+
+	return 0;
+}
+
+/* miscellaneous platform dependent initialisations */
+int misc_init_r(void)
+{
+	/* adjust flash start and offset to detected values */
+	gd->bd->bi_flashstart = flash_info[0].start[0];
+	gd->bd->bi_flashoffset = 0;
+
+	/* adjust mapping */
+	out_be32((void *)MPC5XXX_BOOTCS_START,
+		 START_REG(gd->bd->bi_flashstart));
+	out_be32((void *)MPC5XXX_CS0_START, START_REG(gd->bd->bi_flashstart));
+	out_be32((void *)MPC5XXX_BOOTCS_STOP,
+		 STOP_REG(gd->bd->bi_flashstart, gd->bd->bi_flashsize));
+	out_be32((void *)MPC5XXX_CS0_STOP,
+		 STOP_REG(gd->bd->bi_flashstart, gd->bd->bi_flashsize));
+
+	return 0;
+}
+
+#if defined(CONFIG_OF_LIBFDT) && defined(CONFIG_OF_BOARD_SETUP)
+void ft_board_setup(void *blob, bd_t * bd)
+{
+	ft_cpu_setup(blob, bd);
+}
+#endif /* defined(CONFIG_OF_FLAT_TREE) && defined(CONFIG_OF_BOARD_SETUP) */
+
+#ifdef CONFIG_SPL_OS_BOOT
+/*
+ * A3M071 specific implementation of spl_start_uboot()
+ *
+ * RETURN
+ * 0 if booting into OS is selected (default)
+ * 1 if booting into U-Boot is selected
+ */
+int spl_start_uboot(void)
+{
+	char s[8];
+
+	env_init();
+	getenv_f("boot_os", s, sizeof(s));
+	if ((s != NULL) && (strcmp(s, "yes") == 0))
+		return 0;
+
+	return 1;
+}
+#endif
diff --git a/board/a3m071/mt46v16m16-75.h b/board/a3m071/mt46v16m16-75.h
new file mode 100644
index 0000000..e49e996
--- /dev/null
+++ b/board/a3m071/mt46v16m16-75.h
@@ -0,0 +1,32 @@
+/*
+ * (C) Copyright 2004
+ * Mark Jonas, Freescale Semiconductor, mark.jonas@motorola.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.
+ */
+
+#define SDRAM_DDR		/* is DDR */
+
+#if defined(CONFIG_MPC5200)
+/* Settings for XLB = 132 MHz */
+#define SDRAM_MODE	0x018D0000
+#define SDRAM_EMODE	0x40090000
+#define SDRAM_CONTROL	0x704f0f00
+#define SDRAM_CONFIG1	0x73722930
+#define SDRAM_CONFIG2	0x47770000
+#define SDRAM_TAPDELAY	0x10000000
+
+#else
+#error CONFIG_MPC5200 not defined
+#endif