ARM: Add arm1176 core with S3C6400 SoC

Based on the original S3C64XX port by Samsung for U-Boot 1.1.6.

Signed-off-by: Guennadi Liakhovetski <lg@denx.de>

5 files changed, 543 insertions, 0 deletions

diff --git a/cpu/arm1176/s3c64xx/Makefile b/cpu/arm1176/s3c64xx/Makefile
new file mode 100644
index 0000000..fa4ee3f
--- /dev/null
+++ b/cpu/arm1176/s3c64xx/Makefile
@@ -0,0 +1,48 @@
+#
+# (C) Copyright 2000-2003
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# (C) Copyright 2008
+# Guennadi Liakhovetki, DENX Software Engineering, <lg@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-y	= interrupts.o
+COBJS-$(CONFIG_S3C6400)	+= cpu_init.o speed.o
+
+OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS-y))
+
+all:	$(obj).depend $(START) $(LIB)
+
+$(LIB):	$(OBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS)
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/cpu/arm1176/s3c64xx/config.mk b/cpu/arm1176/s3c64xx/config.mk
new file mode 100644
index 0000000..204e880
--- /dev/null
+++ b/cpu/arm1176/s3c64xx/config.mk
@@ -0,0 +1,34 @@
+#
+# (C) Copyright 2002
+# Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of
+# the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+PLATFORM_RELFLAGS += -fno-strict-aliasing  -fno-common -ffixed-r8 \
+	-msoft-float
+
+# Make ARMv5 to allow more compilers to work, even though its v6.
+PLATFORM_CPPFLAGS += -march=armv5t
+# =========================================================================
+#
+# Supply options according to compiler version
+#
+# =========================================================================
+#PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu)
+PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,))
diff --git a/cpu/arm1176/s3c64xx/cpu_init.S b/cpu/arm1176/s3c64xx/cpu_init.S
new file mode 100644
index 0000000..08bda99
--- /dev/null
+++ b/cpu/arm1176/s3c64xx/cpu_init.S
@@ -0,0 +1,142 @@
+/*
+ * Originates from Samsung's u-boot 1.1.6 port to S3C6400 / SMDK6400
+ *
+ * Copyright (C) 2008
+ * Guennadi Liakhovetki, DENX Software Engineering, <lg@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 <config.h>
+#include <s3c6400.h>
+
+	.globl mem_ctrl_asm_init
+mem_ctrl_asm_init:
+	/* Memory subsystem address 0x7e00f120 */
+	ldr	r0, =ELFIN_MEM_SYS_CFG
+
+	/* Xm0CSn2 = NFCON CS0, Xm0CSn3 = NFCON CS1 */
+	mov	r1, #0xd
+	str	r1, [r0]
+
+	/* DMC1 base address 0x7e001000 */
+	ldr	r0, =ELFIN_DMC1_BASE
+
+	ldr	r1, =0x4
+	str	r1, [r0, #INDEX_DMC_MEMC_CMD]
+
+	ldr	r1, =DMC_DDR_REFRESH_PRD
+	str	r1, [r0, #INDEX_DMC_REFRESH_PRD]
+
+	ldr	r1, =DMC_DDR_CAS_LATENCY
+	str	r1, [r0, #INDEX_DMC_CAS_LATENCY]
+
+	ldr	r1, =DMC_DDR_t_DQSS
+	str	r1, [r0, #INDEX_DMC_T_DQSS]
+
+	ldr	r1, =DMC_DDR_t_MRD
+	str	r1, [r0, #INDEX_DMC_T_MRD]
+
+	ldr	r1, =DMC_DDR_t_RAS
+	str	r1, [r0, #INDEX_DMC_T_RAS]
+
+	ldr	r1, =DMC_DDR_t_RC
+	str	r1, [r0, #INDEX_DMC_T_RC]
+
+	ldr	r1, =DMC_DDR_t_RCD
+	ldr	r2, =DMC_DDR_schedule_RCD
+	orr	r1, r1, r2
+	str	r1, [r0, #INDEX_DMC_T_RCD]
+
+	ldr	r1, =DMC_DDR_t_RFC
+	ldr	r2, =DMC_DDR_schedule_RFC
+	orr	r1, r1, r2
+	str	r1, [r0, #INDEX_DMC_T_RFC]
+
+	ldr	r1, =DMC_DDR_t_RP
+	ldr	r2, =DMC_DDR_schedule_RP
+	orr	r1, r1, r2
+	str	r1, [r0, #INDEX_DMC_T_RP]
+
+	ldr	r1, =DMC_DDR_t_RRD
+	str	r1, [r0, #INDEX_DMC_T_RRD]
+
+	ldr	r1, =DMC_DDR_t_WR
+	str	r1, [r0, #INDEX_DMC_T_WR]
+
+	ldr	r1, =DMC_DDR_t_WTR
+	str	r1, [r0, #INDEX_DMC_T_WTR]
+
+	ldr	r1, =DMC_DDR_t_XP
+	str	r1, [r0, #INDEX_DMC_T_XP]
+
+	ldr	r1, =DMC_DDR_t_XSR
+	str	r1, [r0, #INDEX_DMC_T_XSR]
+
+	ldr	r1, =DMC_DDR_t_ESR
+	str	r1, [r0, #INDEX_DMC_T_ESR]
+
+	ldr	r1, =DMC1_MEM_CFG
+	str	r1, [r0, #INDEX_DMC_MEMORY_CFG]
+
+	ldr	r1, =DMC1_MEM_CFG2
+	str	r1, [r0, #INDEX_DMC_MEMORY_CFG2]
+
+	ldr	r1, =DMC1_CHIP0_CFG
+	str	r1, [r0, #INDEX_DMC_CHIP_0_CFG]
+
+	ldr	r1, =DMC_DDR_32_CFG
+	str	r1, [r0, #INDEX_DMC_USER_CONFIG]
+
+	/* DMC0 DDR Chip 0 configuration direct command reg */
+	ldr	r1, =DMC_NOP0
+	str	r1, [r0, #INDEX_DMC_DIRECT_CMD]
+
+	/* Precharge All */
+	ldr	r1, =DMC_PA0
+	str	r1, [r0, #INDEX_DMC_DIRECT_CMD]
+
+	/* Auto Refresh 2 time */
+	ldr	r1, =DMC_AR0
+	str	r1, [r0, #INDEX_DMC_DIRECT_CMD]
+	str	r1, [r0, #INDEX_DMC_DIRECT_CMD]
+
+	/* MRS */
+	ldr	r1, =DMC_mDDR_EMR0
+	str	r1, [r0, #INDEX_DMC_DIRECT_CMD]
+
+	/* Mode Reg */
+	ldr	r1, =DMC_mDDR_MR0
+	str	r1, [r0, #INDEX_DMC_DIRECT_CMD]
+
+	/* Enable DMC1 */
+	mov	r1, #0x0
+	str	r1, [r0, #INDEX_DMC_MEMC_CMD]
+
+check_dmc1_ready:
+	ldr	r1, [r0, #INDEX_DMC_MEMC_STATUS]
+	mov	r2, #0x3
+	and	r1, r1, r2
+	cmp	r1, #0x1
+	bne	check_dmc1_ready
+	nop
+
+	mov	pc, lr
+
+	.ltorg
diff --git a/cpu/arm1176/s3c64xx/interrupts.c b/cpu/arm1176/s3c64xx/interrupts.c
new file mode 100644
index 0000000..8356ae4
--- /dev/null
+++ b/cpu/arm1176/s3c64xx/interrupts.c
@@ -0,0 +1,174 @@
+/*
+ * (C) Copyright 2003
+ * Texas Instruments <www.ti.com>
+ *
+ * (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 2002-2004
+ * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
+ *
+ * (C) Copyright 2004
+ * Philippe Robin, ARM Ltd. <philippe.robin@arm.com>
+ *
+ * (C) Copyright 2008
+ * Guennadi Liakhovetki, DENX Software Engineering, <lg@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 <common.h>
+#include <asm/proc-armv/ptrace.h>
+#include <s3c6400.h>
+
+static ulong timer_load_val;
+
+#define PRESCALER	167
+
+static s3c64xx_timers *s3c64xx_get_base_timers(void)
+{
+	return (s3c64xx_timers *)ELFIN_TIMER_BASE;
+}
+
+/* macro to read the 16 bit timer */
+static inline ulong read_timer(void)
+{
+	s3c64xx_timers *const timers = s3c64xx_get_base_timers();
+
+	return timers->TCNTO4;
+}
+
+/* Internal tick units */
+/* Last decremneter snapshot */
+static unsigned long lastdec;
+/* Monotonic incrementing timer */
+static unsigned long long timestamp;
+
+int interrupt_init(void)
+{
+	s3c64xx_timers *const timers = s3c64xx_get_base_timers();
+
+	/* use PWM Timer 4 because it has no output */
+	/*
+	 * We use the following scheme for the timer:
+	 * Prescaler is hard fixed at 167, divider at 1/4.
+	 * This gives at PCLK frequency 66MHz approx. 10us ticks
+	 * The timer is set to wrap after 100s, at 66MHz this obviously
+	 * happens after 10,000,000 ticks. A long variable can thus
+	 * keep values up to 40,000s, i.e., 11 hours. This should be
+	 * enough for most uses:-) Possible optimizations: select a
+	 * binary-friendly frequency, e.g., 1ms / 128. Also calculate
+	 * the prescaler automatically for other PCLK frequencies.
+	 */
+	timers->TCFG0 = PRESCALER << 8;
+	if (timer_load_val == 0) {
+		timer_load_val = get_PCLK() / PRESCALER * (100 / 4); /* 100s */
+		timers->TCFG1 = (timers->TCFG1 & ~0xf0000) | 0x20000;
+	}
+
+	/* load value for 10 ms timeout */
+	lastdec = timers->TCNTB4 = timer_load_val;
+	/* auto load, manual update of Timer 4 */
+	timers->TCON = (timers->TCON & ~0x00700000) | TCON_4_AUTO |
+		TCON_4_UPDATE;
+
+	/* auto load, start Timer 4 */
+	timers->TCON = (timers->TCON & ~0x00700000) | TCON_4_AUTO | COUNT_4_ON;
+	timestamp = 0;
+
+	return 0;
+}
+
+/*
+ * timer without interrupts
+ */
+
+/*
+ * This function is derived from PowerPC code (read timebase as long long).
+ * On ARM it just returns the timer value.
+ */
+unsigned long long get_ticks(void)
+{
+	ulong now = read_timer();
+
+	if (lastdec >= now) {
+		/* normal mode */
+		timestamp += lastdec - now;
+	} else {
+		/* we have an overflow ... */
+		timestamp += lastdec + timer_load_val - now;
+	}
+	lastdec = now;
+
+	return timestamp;
+}
+
+/*
+ * This function is derived from PowerPC code (timebase clock frequency).
+ * On ARM it returns the number of timer ticks per second.
+ */
+ulong get_tbclk(void)
+{
+	/* We overrun in 100s */
+	return (ulong)(timer_load_val / 100);
+}
+
+void reset_timer_masked(void)
+{
+	/* reset time */
+	lastdec = read_timer();
+	timestamp = 0;
+}
+
+void reset_timer(void)
+{
+	reset_timer_masked();
+}
+
+ulong get_timer_masked(void)
+{
+	return get_ticks() / (timer_load_val / (100 * CFG_HZ));
+}
+
+ulong get_timer(ulong base)
+{
+	return get_timer_masked() - base;
+}
+
+void set_timer(ulong t)
+{
+	timestamp = t * (timer_load_val / (100 * CFG_HZ));
+}
+
+void udelay(unsigned long usec)
+{
+	unsigned long long tmp;
+	ulong tmo;
+
+	tmo = (usec + 9) / 10;
+	tmp = get_ticks() + tmo;	/* get current timestamp */
+
+	while (get_ticks() < tmp)/* loop till event */
+		 /*NOP*/;
+}
diff --git a/cpu/arm1176/s3c64xx/speed.c b/cpu/arm1176/s3c64xx/speed.c
new file mode 100644
index 0000000..5c335a5
--- /dev/null
+++ b/cpu/arm1176/s3c64xx/speed.c
@@ -0,0 +1,145 @@
+/*
+ * (C) Copyright 2001-2004
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2002
+ * David Mueller, ELSOFT AG, d.mueller@elsoft.ch
+ *
+ * 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
+ */
+
+/*
+ * This code should work for both the S3C2400 and the S3C2410
+ * as they seem to have the same PLL and clock machinery inside.
+ * The different address mapping is handled by the s3c24xx.h files below.
+ */
+
+#include <common.h>
+#include <s3c6400.h>
+
+#define APLL 0
+#define MPLL 1
+#define EPLL 2
+
+/* ------------------------------------------------------------------------- */
+/*
+ * NOTE: This describes the proper use of this file.
+ *
+ * CONFIG_SYS_CLK_FREQ should be defined as the input frequency of the PLL.
+ *
+ * get_FCLK(), get_HCLK(), get_PCLK() and get_UCLK() return the clock of
+ * the specified bus in HZ.
+ */
+/* ------------------------------------------------------------------------- */
+
+static ulong get_PLLCLK(int pllreg)
+{
+	ulong r, m, p, s;
+
+	switch (pllreg) {
+	case APLL:
+		r = APLL_CON_REG;
+		break;
+	case MPLL:
+		r = MPLL_CON_REG;
+		break;
+	case EPLL:
+		r = EPLL_CON0_REG;
+		break;
+	default:
+		hang();
+	}
+
+	m = (r >> 16) & 0x3ff;
+	p = (r >> 8) & 0x3f;
+	s = r & 0x7;
+
+	return m * (CONFIG_SYS_CLK_FREQ / (p * (1 << s)));
+}
+
+/* return ARMCORE frequency */
+ulong get_ARMCLK(void)
+{
+	ulong div;
+
+	div = CLK_DIV0_REG;
+
+	return get_PLLCLK(APLL) / ((div & 0x7) + 1);
+}
+
+/* return FCLK frequency */
+ulong get_FCLK(void)
+{
+	return get_PLLCLK(APLL);
+}
+
+/* return HCLK frequency */
+ulong get_HCLK(void)
+{
+	ulong fclk;
+
+	uint hclkx2_div = ((CLK_DIV0_REG >> 9) & 0x7) + 1;
+	uint hclk_div = ((CLK_DIV0_REG >> 8) & 0x1) + 1;
+
+	/*
+	 * Bit 7 exists on s3c6410, and not on s3c6400, it is reserved on
+	 * s3c6400 and is always 0, and it is indeed running in ASYNC mode
+	 */
+	if (OTHERS_REG & 0x80)
+		fclk = get_FCLK();		/* SYNC Mode	*/
+	else
+		fclk = get_PLLCLK(MPLL);	/* ASYNC Mode	*/
+
+	return fclk / (hclk_div * hclkx2_div);
+}
+
+/* return PCLK frequency */
+ulong get_PCLK(void)
+{
+	ulong fclk;
+	uint hclkx2_div = ((CLK_DIV0_REG >> 9) & 0x7) + 1;
+	uint pre_div = ((CLK_DIV0_REG >> 12) & 0xf) + 1;
+
+	if (OTHERS_REG & 0x80)
+		fclk = get_FCLK();		/* SYNC Mode	*/
+	else
+		fclk = get_PLLCLK(MPLL);	/* ASYNC Mode	*/
+
+	return fclk / (hclkx2_div * pre_div);
+}
+
+/* return UCLK frequency */
+ulong get_UCLK(void)
+{
+	return get_PLLCLK(EPLL);
+}
+
+int print_cpuinfo(void)
+{
+	printf("\nCPU:     S3C6400@%luMHz\n", get_ARMCLK() / 1000000);
+	printf("         Fclk = %luMHz, Hclk = %luMHz, Pclk = %luMHz ",
+	       get_FCLK() / 1000000, get_HCLK() / 1000000,
+	       get_PCLK() / 1000000);
+
+	if (OTHERS_REG & 0x80)
+		printf("(SYNC Mode) \n");
+	else
+		printf("(ASYNC Mode) \n");
+	return 0;
+}