mx27: basic cpu support
This patch adds generic code to support Freescale's i.MX27 SoCs.
Signed-off-by: Ilya Yanok <yanok@emcraft.com>
diff --git a/cpu/arm926ejs/mx27/Makefile b/cpu/arm926ejs/mx27/Makefile
new file mode 100644
index 0000000..67d1b0e
--- /dev/null
+++ b/cpu/arm926ejs/mx27/Makefile
@@ -0,0 +1,44 @@
+#
+# (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 reset.o timer.o
+
+SRCS := $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS := $(addprefix $(obj),$(SOBJS) $(COBJS))
+
+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/mx27/generic.c b/cpu/arm926ejs/mx27/generic.c
new file mode 100644
index 0000000..eab54d8
--- /dev/null
+++ b/cpu/arm926ejs/mx27/generic.c
@@ -0,0 +1,241 @@
+/*
+ * 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 <asm/io.h>
+#include <asm/arch/imx-regs.h>
+
+/*
+ * get the system pll clock in Hz
+ *
+ * mfi + mfn / (mfd +1)
+ * f = 2 * f_ref * --------------------
+ * pd + 1
+ */
+unsigned int imx_decode_pll(unsigned int pll, unsigned int f_ref)
+{
+ unsigned int mfi = (pll >> 10) & 0xf;
+ unsigned int mfn = pll & 0x3ff;
+ unsigned int mfd = (pll >> 16) & 0x3ff;
+ unsigned int pd = (pll >> 26) & 0xf;
+
+ mfi = mfi <= 5 ? 5 : mfi;
+
+ return lldiv(2 * (u64)f_ref * (mfi * (mfd + 1) + mfn),
+ (mfd + 1) * (pd + 1));
+}
+
+static ulong clk_in_32k(void)
+{
+ return 1024 * CONFIG_MX27_CLK32;
+}
+
+static ulong clk_in_26m(void)
+{
+ struct pll_regs *pll = (struct pll_regs *)IMX_PLL_BASE;
+
+ if (readl(&pll->cscr) & CSCR_OSC26M_DIV1P5) {
+ /* divide by 1.5 */
+ return 26000000 * 2 / 3;
+ } else {
+ return 26000000;
+ }
+}
+
+ulong imx_get_mpllclk(void)
+{
+ struct pll_regs *pll = (struct pll_regs *)IMX_PLL_BASE;
+ ulong cscr = readl(&pll->cscr);
+ ulong fref;
+
+ if (cscr & CSCR_MCU_SEL)
+ fref = clk_in_26m();
+ else
+ fref = clk_in_32k();
+
+ return imx_decode_pll(readl(&pll->mpctl0), fref);
+}
+
+ulong imx_get_armclk(void)
+{
+ struct pll_regs *pll = (struct pll_regs *)IMX_PLL_BASE;
+ ulong cscr = readl(&pll->cscr);
+ ulong fref = imx_get_mpllclk();
+ ulong div;
+
+ if (!(cscr & CSCR_ARM_SRC_MPLL))
+ fref = lldiv((fref * 2), 3);
+
+ div = ((cscr >> 12) & 0x3) + 1;
+
+ return lldiv(fref, div);
+}
+
+ulong imx_get_ahbclk(void)
+{
+ struct pll_regs *pll = (struct pll_regs *)IMX_PLL_BASE;
+ ulong cscr = readl(&pll->cscr);
+ ulong fref = imx_get_mpllclk();
+ ulong div;
+
+ div = ((cscr >> 8) & 0x3) + 1;
+
+ return lldiv(fref * 2, 3 * div);
+}
+
+ulong imx_get_spllclk(void)
+{
+ struct pll_regs *pll = (struct pll_regs *)IMX_PLL_BASE;
+ ulong cscr = readl(&pll->cscr);
+ ulong fref;
+
+ if (cscr & CSCR_SP_SEL)
+ fref = clk_in_26m();
+ else
+ fref = clk_in_32k();
+
+ return imx_decode_pll(readl(&pll->spctl0), fref);
+}
+
+static ulong imx_decode_perclk(ulong div)
+{
+ return lldiv((imx_get_mpllclk() * 2), (div * 3));
+}
+
+ulong imx_get_perclk1(void)
+{
+ struct pll_regs *pll = (struct pll_regs *)IMX_PLL_BASE;
+
+ return imx_decode_perclk((readl(&pll->pcdr1) & 0x3f) + 1);
+}
+
+ulong imx_get_perclk2(void)
+{
+ struct pll_regs *pll = (struct pll_regs *)IMX_PLL_BASE;
+
+ return imx_decode_perclk(((readl(&pll->pcdr1) >> 8) & 0x3f) + 1);
+}
+
+ulong imx_get_perclk3(void)
+{
+ struct pll_regs *pll = (struct pll_regs *)IMX_PLL_BASE;
+
+ return imx_decode_perclk(((readl(&pll->pcdr1) >> 16) & 0x3f) + 1);
+}
+
+ulong imx_get_perclk4(void)
+{
+ struct pll_regs *pll = (struct pll_regs *)IMX_PLL_BASE;
+
+ return imx_decode_perclk(((readl(&pll->pcdr1) >> 24) & 0x3f) + 1);
+}
+
+#if defined(CONFIG_DISPLAY_CPUINFO)
+int print_cpuinfo (void)
+{
+ char buf[32];
+
+ printf("CPU: Freescale i.MX27 at %s MHz\n\n",
+ strmhz(buf, imx_get_mpllclk()));
+ return 0;
+}
+#endif
+
+void imx_gpio_mode(int gpio_mode)
+{
+ struct gpio_regs *regs = (struct gpio_regs *)IMX_GPIO_BASE;
+ unsigned int pin = gpio_mode & GPIO_PIN_MASK;
+ unsigned int port = (gpio_mode & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
+ unsigned int ocr = (gpio_mode & GPIO_OCR_MASK) >> GPIO_OCR_SHIFT;
+ unsigned int aout = (gpio_mode & GPIO_AOUT_MASK) >> GPIO_AOUT_SHIFT;
+ unsigned int bout = (gpio_mode & GPIO_BOUT_MASK) >> GPIO_BOUT_SHIFT;
+ unsigned int tmp;
+
+ /* Pullup enable */
+ if (gpio_mode & GPIO_PUEN) {
+ writel(readl(®s->port[port].puen) | (1 << pin),
+ ®s->port[port].puen);
+ } else {
+ writel(readl(®s->port[port].puen) & ~(1 << pin),
+ ®s->port[port].puen);
+ }
+
+ /* Data direction */
+ if (gpio_mode & GPIO_OUT) {
+ writel(readl(®s->port[port].ddir) | 1 << pin,
+ ®s->port[port].ddir);
+ } else {
+ writel(readl(®s->port[port].ddir) & ~(1 << pin),
+ ®s->port[port].ddir);
+ }
+
+ /* Primary / alternate function */
+ if (gpio_mode & GPIO_AF) {
+ writel(readl(®s->port[port].gpr) | (1 << pin),
+ ®s->port[port].gpr);
+ } else {
+ writel(readl(®s->port[port].gpr) & ~(1 << pin),
+ ®s->port[port].gpr);
+ }
+
+ /* use as gpio? */
+ if (!(gpio_mode & (GPIO_PF | GPIO_AF))) {
+ writel(readl(®s->port[port].gius) | (1 << pin),
+ ®s->port[port].gius);
+ } else {
+ writel(readl(®s->port[port].gius) & ~(1 << pin),
+ ®s->port[port].gius);
+ }
+
+ /* Output / input configuration */
+ if (pin < 16) {
+ tmp = readl(®s->port[port].ocr1);
+ tmp &= ~(3 << (pin * 2));
+ tmp |= (ocr << (pin * 2));
+ writel(tmp, ®s->port[port].ocr1);
+
+ writel(readl(®s->port[port].iconfa1) & ~(3 << (pin * 2)),
+ ®s->port[port].iconfa1);
+ writel(readl(®s->port[port].iconfa1) | aout << (pin * 2),
+ ®s->port[port].iconfa1);
+ writel(readl(®s->port[port].iconfb1) & ~(3 << (pin * 2)),
+ ®s->port[port].iconfb1);
+ writel(readl(®s->port[port].iconfb1) | bout << (pin * 2),
+ ®s->port[port].iconfb1);
+ } else {
+ pin -= 16;
+
+ tmp = readl(®s->port[port].ocr2);
+ tmp &= ~(3 << (pin * 2));
+ tmp |= (ocr << (pin * 2));
+ writel(tmp, ®s->port[port].ocr2);
+
+ writel(readl(®s->port[port].iconfa2) & ~(3 << (pin * 2)),
+ ®s->port[port].iconfa2);
+ writel(readl(®s->port[port].iconfa2) | aout << (pin * 2),
+ ®s->port[port].iconfa2);
+ writel(readl(®s->port[port].iconfb2) & ~(3 << (pin * 2)),
+ ®s->port[port].iconfb2);
+ writel(readl(®s->port[port].iconfb2) | bout << (pin * 2),
+ ®s->port[port].iconfb2);
+ }
+}
+
diff --git a/cpu/arm926ejs/mx27/reset.c b/cpu/arm926ejs/mx27/reset.c
new file mode 100644
index 0000000..6c54eaf
--- /dev/null
+++ b/cpu/arm926ejs/mx27/reset.c
@@ -0,0 +1,57 @@
+/*
+ * (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, ®s->wcr);
+
+ /* Write Service Sequence */
+ writel(0x00005555, ®s->wsr);
+ writel(0x0000AAAA, ®s->wsr);
+
+ /* Enable watchdog */
+ writel(WCR_WDE, ®s->wcr);
+
+ while (1);
+ /*NOTREACHED*/
+}
diff --git a/cpu/arm926ejs/mx27/timer.c b/cpu/arm926ejs/mx27/timer.c
new file mode 100644
index 0000000..d22252e
--- /dev/null
+++ b/cpu/arm926ejs/mx27/timer.c
@@ -0,0 +1,191 @@
+/*
+ * (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 <div64.h>
+#include <asm/io.h>
+#include <asm/arch/imx-regs.h>
+
+/* General purpose timers bitfields */
+#define GPTCR_SWR (1 << 15) /* Software reset */
+#define GPTCR_FRR (1 << 8) /* Freerun / restart */
+#define GPTCR_CLKSOURCE_32 (4 << 1) /* Clock source */
+#define GPTCR_TEN 1 /* Timer enable */
+
+static ulong timestamp;
+static ulong lastinc;
+
+/*
+ * "time" is measured in 1 / CONFIG_SYS_HZ seconds,
+ * "tick" is internal timer period
+ */
+#ifdef CONFIG_MX27_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_MX27_CLK32);
+ return tick;
+}
+
+static inline unsigned long long time_to_tick(unsigned long long time)
+{
+ time *= CONFIG_MX27_CLK32;
+ do_div(time, CONFIG_SYS_HZ);
+ return time;
+}
+
+static inline unsigned long long us_to_tick(unsigned long long us)
+{
+ us = us * CONFIG_MX27_CLK32 + 999999;
+ do_div(us, 1000000);
+ return us;
+}
+#else
+/* ~2% error */
+#define TICK_PER_TIME ((CONFIG_MX27_CLK32 + CONFIG_SYS_HZ / 2) / \
+ CONFIG_SYS_HZ)
+#define US_PER_TICK (1000000 / CONFIG_MX27_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 32768Hz 32-bit timer overruns in 131072 seconds */
+int timer_init(void)
+{
+ int i;
+ struct gpt_regs *regs = (struct gpt_regs *)IMX_TIM1_BASE;
+ struct pll_regs *pll = (struct pll_regs *)IMX_PLL_BASE;
+
+ /* setup GP Timer 1 */
+ writel(GPTCR_SWR, ®s->gpt_tctl);
+
+ writel(readl(&pll->pccr0) | PCCR0_GPT1_EN, &pll->pccr0);
+ writel(readl(&pll->pccr1) | PCCR1_PERCLK1_EN, &pll->pccr1);
+
+ for (i = 0; i < 100; i++)
+ writel(0, ®s->gpt_tctl); /* We have no udelay by now */
+ writel(0, ®s->gpt_tprer); /* 32Khz */
+ /* Freerun Mode, PERCLK1 input */
+ writel(readl(®s->gpt_tctl) | GPTCR_CLKSOURCE_32 | GPTCR_FRR,
+ ®s->gpt_tctl);
+ writel(readl(®s->gpt_tctl) | GPTCR_TEN, ®s->gpt_tctl);
+
+ return 0;
+}
+
+void reset_timer_masked(void)
+{
+ struct gpt_regs *regs = (struct gpt_regs *)IMX_TIM1_BASE;
+ /* reset time */
+ /* capture current incrementer value time */
+ lastinc = readl(®s->gpt_tcn);
+ timestamp = 0; /* start "advancing" time stamp from 0 */
+}
+
+void reset_timer(void)
+{
+ reset_timer_masked();
+}
+
+unsigned long long get_ticks (void)
+{
+ struct gpt_regs *regs = (struct gpt_regs *)IMX_TIM1_BASE;
+ ulong now = readl(®s->gpt_tcn); /* 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_MX27_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 perserve 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*/;
+}
+