Add support for Freescale MX25 SOC

ARM926EJS core with MX31 peripherals.

Signed-off-by: John Rigby <jcrigby@gmail.com>
Earlier Version Signed-off-by: Wolfgang Denk <wd@denx.de>
CC: Fred Fan <fanyefeng@gmail.com>
CC: Tom <Tom.Rix@windriver.com>

4 files changed, 552 insertions, 0 deletions

diff --git a/cpu/arm926ejs/mx25/Makefile b/cpu/arm926ejs/mx25/Makefile
new file mode 100644
index 0000000000..55c1e899be
--- /dev/null
+++ b/cpu/arm926ejs/mx25/Makefile
@@ -0,0 +1,46 @@
+#
+# (C) Copyright 2000-2006
+# Wolfgang Denk, DENX Software Engineering, wd@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
+
+include $(TOPDIR)/config.mk
+
+LIB	= $(obj)lib$(SOC).a
+
+COBJS	= generic.o timer.o
+MX27OBJS = reset.o
+
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+SRCS	+= $(addprefix $(SRCTREE)/cpu/arm926ejs/mx27/,$(MX27OBJS:.o=.c))
+OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS) $(MX27OBJS))
+
+all:	$(obj).depend $(LIB)
+
+$(LIB):	$(OBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS)
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/cpu/arm926ejs/mx25/generic.c b/cpu/arm926ejs/mx25/generic.c
new file mode 100644
index 0000000000..694841dd10
--- /dev/null
+++ b/cpu/arm926ejs/mx25/generic.c
@@ -0,0 +1,263 @@
+/*
+ * (C) Copyright 2009 DENX Software Engineering
+ * Author: John Rigby <jrigby@gmail.com>
+ *
+ * Based on mx27/generic.c:
+ *  Copyright (c) 2008 Eric Jarrige <eric.jarrige@armadeus.org>
+ *  Copyright (c) 2009 Ilya Yanok <yanok@emcraft.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.
+ *
+ * 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 <div64.h>
+#include <netdev.h>
+#include <asm/io.h>
+#include <asm/arch/imx-regs.h>
+#include <asm/arch/imx25-pinmux.h>
+#ifdef CONFIG_MXC_MMC
+#include <asm/arch/mxcmmc.h>
+#endif
+
+/*
+ *  get the system pll clock in Hz
+ *
+ *                  mfi + mfn / (mfd +1)
+ *  f = 2 * f_ref * --------------------
+ *                        pd + 1
+ */
+static unsigned int imx_decode_pll (unsigned int pll, unsigned int f_ref)
+{
+	unsigned int mfi = (pll >> CCM_PLL_MFI_SHIFT)
+	    & CCM_PLL_MFI_MASK;
+	unsigned int mfn = (pll >> CCM_PLL_MFN_SHIFT)
+	    & CCM_PLL_MFN_MASK;
+	unsigned int mfd = (pll >> CCM_PLL_MFD_SHIFT)
+	    & CCM_PLL_MFD_MASK;
+	unsigned int pd = (pll >> CCM_PLL_PD_SHIFT)
+	    & CCM_PLL_PD_MASK;
+
+	mfi = mfi <= 5 ? 5 : mfi;
+
+	return lldiv (2 * (u64) f_ref * (mfi * (mfd + 1) + mfn),
+		      (mfd + 1) * (pd + 1));
+}
+
+static ulong imx_get_mpllclk (void)
+{
+	struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
+	ulong fref = 24000000;
+
+	return imx_decode_pll (readl (&ccm->mpctl), fref);
+}
+
+ulong imx_get_armclk (void)
+{
+	struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
+	ulong cctl = readl (&ccm->cctl);
+	ulong fref = imx_get_mpllclk ();
+	ulong div;
+
+	if (cctl & CCM_CCTL_ARM_SRC)
+		fref = lldiv ((fref * 3), 4);
+
+	div = ((cctl >> CCM_CCTL_ARM_DIV_SHIFT)
+	       & CCM_CCTL_ARM_DIV_MASK) + 1;
+
+	return lldiv (fref, div);
+}
+
+ulong imx_get_ahbclk (void)
+{
+	struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
+	ulong cctl = readl (&ccm->cctl);
+	ulong fref = imx_get_armclk ();
+	ulong div;
+
+	div = ((cctl >> CCM_CCTL_AHB_DIV_SHIFT)
+	       & CCM_CCTL_AHB_DIV_MASK) + 1;
+
+	return lldiv (fref, div);
+}
+
+ulong imx_get_perclk (int clk)
+{
+	struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
+	ulong fref = imx_get_ahbclk ();
+	ulong div;
+
+	div = readl (&ccm->pcdr[CCM_PERCLK_REG (clk)]);
+	div = ((div >> CCM_PERCLK_SHIFT (clk)) & CCM_PERCLK_MASK) + 1;
+
+	return lldiv (fref, div);
+}
+
+#if defined(CONFIG_DISPLAY_CPUINFO)
+int print_cpuinfo (void)
+{
+	char buf[32];
+
+	printf ("CPU:   Freescale i.MX25 at %s MHz\n\n",
+		strmhz (buf, imx_get_mpllclk ()));
+	return 0;
+}
+#endif
+
+int cpu_eth_init (bd_t * bis)
+{
+#if defined(CONFIG_FEC_MXC)
+	struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
+	ulong val;
+
+	val = readl (&ccm->cgr0);
+	val |= (1 << 23);
+	writel (val, &ccm->cgr0);
+	return fecmxc_initialize (bis);
+#else
+	return 0;
+#endif
+}
+
+/*
+ * Initializes on-chip MMC controllers.
+ * to override, implement board_mmc_init()
+ */
+int cpu_mmc_init (bd_t * bis)
+{
+#ifdef CONFIG_MXC_MMC
+	return mxc_mmc_init (bis);
+#else
+	return 0;
+#endif
+}
+
+#ifdef CONFIG_MXC_UART
+void mx25_uart_init_pins (void)
+{
+	struct iomuxc_mux_ctl *muxctl;
+	struct iomuxc_pad_ctl *padctl;
+	u32 inpadctl;
+	u32 outpadctl;
+	u32 muxmode0;
+
+	muxctl = (struct iomuxc_mux_ctl *)IMX_IOPADMUX_BASE;
+	padctl = (struct iomuxc_pad_ctl *)IMX_IOPADCTL_BASE;
+	muxmode0 = MX25_PIN_MUX_MODE (0);
+	/*
+	 * set up input pins with hysteresis and 100K pull-ups
+	 */
+	inpadctl = MX25_PIN_PAD_CTL_HYS
+	    | MX25_PIN_PAD_CTL_PKE
+	    | MX25_PIN_PAD_CTL_PUE | MX25_PIN_PAD_CTL_100K_PU;
+
+	/*
+	 * set up output pins with 100K pull-downs
+	 * FIXME: need to revisit this
+	 *      PUE is ignored if PKE is not set
+	 *      so the right value here is likely
+	 *        0x0 for no pull up/down
+	 *      or
+	 *        0xc0 for 100k pull down
+	 */
+	outpadctl = MX25_PIN_PAD_CTL_PUE | MX25_PIN_PAD_CTL_100K_PD;
+
+	/* UART1 */
+	/* rxd */
+	writel (muxmode0, &muxctl->pad_uart1_rxd);
+	writel (inpadctl, &padctl->pad_uart1_rxd);
+
+	/* txd */
+	writel (muxmode0, &muxctl->pad_uart1_txd);
+	writel (outpadctl, &padctl->pad_uart1_txd);
+
+	/* rts */
+	writel (muxmode0, &muxctl->pad_uart1_rts);
+	writel (outpadctl, &padctl->pad_uart1_rts);
+
+	/* cts */
+	writel (muxmode0, &muxctl->pad_uart1_cts);
+	writel (inpadctl, &padctl->pad_uart1_cts);
+}
+#endif /* CONFIG_MXC_UART */
+
+#ifdef CONFIG_FEC_MXC
+void mx25_fec_init_pins (void)
+{
+	struct iomuxc_mux_ctl *muxctl;
+	struct iomuxc_pad_ctl *padctl;
+	u32 inpadctl_100kpd;
+	u32 inpadctl_22kpu;
+	u32 outpadctl;
+	u32 muxmode0;
+
+	muxctl = (struct iomuxc_mux_ctl *)IMX_IOPADMUX_BASE;
+	padctl = (struct iomuxc_pad_ctl *)IMX_IOPADCTL_BASE;
+	muxmode0 = MX25_PIN_MUX_MODE (0);
+	inpadctl_100kpd = MX25_PIN_PAD_CTL_HYS
+	    | MX25_PIN_PAD_CTL_PKE
+	    | MX25_PIN_PAD_CTL_PUE | MX25_PIN_PAD_CTL_100K_PD;
+	inpadctl_22kpu = MX25_PIN_PAD_CTL_HYS
+	    | MX25_PIN_PAD_CTL_PKE
+	    | MX25_PIN_PAD_CTL_PUE | MX25_PIN_PAD_CTL_22K_PU;
+	/*
+	 * set up output pins with 100K pull-downs
+	 * FIXME: need to revisit this
+	 *      PUE is ignored if PKE is not set
+	 *      so the right value here is likely
+	 *        0x0 for no pull
+	 *      or
+	 *        0xc0 for 100k pull down
+	 */
+	outpadctl = MX25_PIN_PAD_CTL_PUE | MX25_PIN_PAD_CTL_100K_PD;
+
+	/* FEC_TX_CLK */
+	writel (muxmode0, &muxctl->pad_fec_tx_clk);
+	writel (inpadctl_100kpd, &padctl->pad_fec_tx_clk);
+
+	/* FEC_RX_DV */
+	writel (muxmode0, &muxctl->pad_fec_rx_dv);
+	writel (inpadctl_100kpd, &padctl->pad_fec_rx_dv);
+
+	/* FEC_RDATA0 */
+	writel (muxmode0, &muxctl->pad_fec_rdata0);
+	writel (inpadctl_100kpd, &padctl->pad_fec_rdata0);
+
+	/* FEC_TDATA0 */
+	writel (muxmode0, &muxctl->pad_fec_tdata0);
+	writel (outpadctl, &padctl->pad_fec_tdata0);
+
+	/* FEC_TX_EN */
+	writel (muxmode0, &muxctl->pad_fec_tx_en);
+	writel (outpadctl, &padctl->pad_fec_tx_en);
+
+	/* FEC_MDC */
+	writel (muxmode0, &muxctl->pad_fec_mdc);
+	writel (outpadctl, &padctl->pad_fec_mdc);
+
+	/* FEC_MDIO */
+	writel (muxmode0, &muxctl->pad_fec_mdio);
+	writel (inpadctl_22kpu, &padctl->pad_fec_mdio);
+
+	/* FEC_RDATA1 */
+	writel (muxmode0, &muxctl->pad_fec_rdata1);
+	writel (inpadctl_100kpd, &padctl->pad_fec_rdata1);
+
+	/* FEC_TDATA1 */
+	writel (muxmode0, &muxctl->pad_fec_tdata1);
+	writel (outpadctl, &padctl->pad_fec_tdata1);
+
+}
+#endif /* CONFIG_FEC_MXC */
diff --git a/cpu/arm926ejs/mx25/reset.c b/cpu/arm926ejs/mx25/reset.c
new file mode 100644
index 0000000000..1e33150eb9
--- /dev/null
+++ b/cpu/arm926ejs/mx25/reset.c
@@ -0,0 +1,56 @@
+/*
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Alex Zuepke <azu@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
+ *
+ * (C) Copyright 2009
+ * Ilya Yanok, Emcraft Systems Ltd, <yanok@emcraft.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.
+ *
+ * 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 <asm/io.h>
+#include <asm/arch/imx-regs.h>
+
+/*
+ * Reset the cpu by setting up the watchdog timer and let it time out
+ */
+void reset_cpu (ulong ignored)
+{
+	struct wdog_regs *regs = (struct wdog_regs *)IMX_WDT_BASE;
+	/* Disable watchdog and set Time-Out field to 0 */
+	writel (0x00000000, &regs->wcr);
+
+	/* Write Service Sequence */
+	writel (0x00005555, &regs->wsr);
+	writel (0x0000AAAA, &regs->wsr);
+
+	/* Enable watchdog */
+	writel (WCR_WDE, &regs->wcr);
+
+	while (1) ;
+}
diff --git a/cpu/arm926ejs/mx25/timer.c b/cpu/arm926ejs/mx25/timer.c
new file mode 100644
index 0000000000..11d41a8bf9
--- /dev/null
+++ b/cpu/arm926ejs/mx25/timer.c
@@ -0,0 +1,187 @@
+/*
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Alex Zuepke <azu@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
+ *
+ * (C) Copyright 2009
+ * Ilya Yanok, Emcraft Systems Ltd, <yanok@emcraft.com>
+ *
+ * (C) Copyright 2009 DENX Software Engineering
+ * Author: John Rigby <jrigby@gmail.com>
+ * 	Add support for MX25
+ *
+ * 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 <div64.h>
+#include <asm/io.h>
+#include <asm/arch/imx-regs.h>
+
+static ulong timestamp;
+static ulong lastinc;
+
+/*
+ * "time" is measured in 1 / CONFIG_SYS_HZ seconds,
+ * "tick" is internal timer period
+ */
+#ifdef CONFIG_MX25_TIMER_HIGH_PRECISION
+/* ~0.4% error - measured with stop-watch on 100s boot-delay */
+static inline unsigned long long tick_to_time(unsigned long long tick)
+{
+	tick *= CONFIG_SYS_HZ;
+	do_div(tick, CONFIG_MX25_CLK32);
+	return tick;
+}
+
+static inline unsigned long long time_to_tick(unsigned long long time)
+{
+	time *= CONFIG_MX25_CLK32;
+	do_div(time, CONFIG_SYS_HZ);
+	return time;
+}
+
+static inline unsigned long long us_to_tick(unsigned long long us)
+{
+	us = us * CONFIG_MX25_CLK32 + 999999;
+	do_div(us, 1000000);
+	return us;
+}
+#else
+/* ~2% error */
+#define TICK_PER_TIME	((CONFIG_MX25_CLK32 + CONFIG_SYS_HZ / 2) / \
+		CONFIG_SYS_HZ)
+#define US_PER_TICK	(1000000 / CONFIG_MX25_CLK32)
+
+static inline unsigned long long tick_to_time(unsigned long long tick)
+{
+	do_div(tick, TICK_PER_TIME);
+	return tick;
+}
+
+static inline unsigned long long time_to_tick(unsigned long long time)
+{
+	return time * TICK_PER_TIME;
+}
+
+static inline unsigned long long us_to_tick(unsigned long long us)
+{
+	us += US_PER_TICK - 1;
+	do_div(us, US_PER_TICK);
+	return us;
+}
+#endif
+
+/* nothing really to do with interrupts, just starts up a counter. */
+/* The 32KHz 32-bit timer overruns in 134217 seconds */
+int timer_init(void)
+{
+	int i;
+	struct gpt_regs *gpt = (struct gpt_regs *)IMX_GPT1_BASE;
+	struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
+
+	/* setup GP Timer 1 */
+	writel(GPT_CTRL_SWR, &gpt->ctrl);
+
+	writel(readl(&ccm->cgr1) | CCM_CGR1_GPT1, &ccm->cgr1);
+
+	for (i = 0; i < 100; i++)
+		writel(0, &gpt->ctrl); /* We have no udelay by now */
+	writel(0, &gpt->pre); /* prescaler = 1 */
+	/* Freerun Mode, 32KHz input */
+	writel(readl(&gpt->ctrl) | GPT_CTRL_CLKSOURCE_32 | GPT_CTRL_FRR,
+			&gpt->ctrl);
+	writel(readl(&gpt->ctrl) | GPT_CTRL_TEN, &gpt->ctrl);
+
+	return 0;
+}
+
+void reset_timer_masked(void)
+{
+	struct gpt_regs *gpt = (struct gpt_regs *)IMX_GPT1_BASE;
+	/* reset time */
+	/* capture current incrementer value time */
+	lastinc = readl(&gpt->counter);
+	timestamp = 0; /* start "advancing" time stamp from 0 */
+}
+
+void reset_timer(void)
+{
+	reset_timer_masked();
+}
+
+unsigned long long get_ticks (void)
+{
+	struct gpt_regs *gpt = (struct gpt_regs *)IMX_GPT1_BASE;
+	ulong now = readl(&gpt->counter); /* current tick value */
+
+	if (now >= lastinc) {
+		/*
+		 * normal mode (non roll)
+		 * move stamp forward with absolut diff ticks
+		 */
+		timestamp += (now - lastinc);
+	} else {
+		/* we have rollover of incrementer */
+		timestamp += (0xFFFFFFFF - lastinc) + now;
+	}
+	lastinc = now;
+	return timestamp;
+}
+
+ulong get_timer_masked (void)
+{
+	/*
+	 * get_ticks() returns a long long (64 bit), it wraps in
+	 * 2^64 / CONFIG_MX25_CLK32 = 2^64 / 2^15 = 2^49 ~ 5 * 10^14 (s) ~
+	 * 5 * 10^9 days... and get_ticks() * CONFIG_SYS_HZ wraps in
+	 * 5 * 10^6 days - long enough.
+	 */
+	return tick_to_time(get_ticks());
+}
+
+ulong get_timer (ulong base)
+{
+	return get_timer_masked () - base;
+}
+
+void set_timer (ulong t)
+{
+	timestamp = time_to_tick(t);
+}
+
+/* delay x useconds AND preserve advance timstamp value */
+void __udelay (unsigned long usec)
+{
+	unsigned long long tmp;
+	ulong tmo;
+
+	tmo = us_to_tick(usec);
+	tmp = get_ticks() + tmo;	/* get current timestamp */
+
+	while (get_ticks() < tmp)	/* loop till event */
+		 /*NOP*/;
+}