* Patch by Greg Ungerer, 19 May 2005:

  add support for the KS8695P (ARM 922 based) CPU

* Patch by Steven Scholz, 19 May 2005:
  Add support for CONFIG_SERIAL_TAG on ARM boards

4 files changed, 476 insertions, 0 deletions

diff --git a/cpu/arm920t/ks8695/Makefile b/cpu/arm920t/ks8695/Makefile
new file mode 100644
index 0000000..ada7174
--- /dev/null
+++ b/cpu/arm920t/ks8695/Makefile
@@ -0,0 +1,43 @@
+#
+# (C) Copyright 2000-2005
+# 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 $(TOPDIR)/config.mk
+
+LIB	= lib$(SOC).a
+
+OBJS	= interrupts.o serial.o
+SOBJS	= lowlevel_init.o
+
+all:	.depend $(LIB)
+
+$(LIB):	$(OBJS) $(SOBJS)
+	$(AR) crv $@ $(OBJS) $(SOBJS)
+
+#########################################################################
+
+.depend:	Makefile $(OBJS:.o=.c)
+		$(CC) -M $(CFLAGS) $(OBJS:.o=.c) > $@
+
+sinclude .depend
+
+#########################################################################
diff --git a/cpu/arm920t/ks8695/interrupts.c b/cpu/arm920t/ks8695/interrupts.c
new file mode 100644
index 0000000..883d689
--- /dev/null
+++ b/cpu/arm920t/ks8695/interrupts.c
@@ -0,0 +1,112 @@
+/*
+ * (C) Copyright 2004-2005, Greg Ungerer <greg.ungerer@opengear.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/arch/platform.h>
+
+/*
+ * Handy KS8695 register access functions.
+ */
+#define	ks8695_read(a)    *((volatile ulong *) (KS8695_IO_BASE + (a)))
+#define	ks8695_write(a,v) *((volatile ulong *) (KS8695_IO_BASE + (a))) = (v)
+
+int timer_inited;
+ulong timer_ticks;
+
+int interrupt_init (void)
+{
+	/* nothing happens here - we don't setup any IRQs */
+	return (0);
+}
+
+/*
+ * Initial timer set constants. Nothing complicated, just set for a 1ms
+ * tick.
+ */
+#define	TIMER_INTERVAL	(TICKS_PER_uSEC * mSEC_1)
+#define	TIMER_COUNT	(TIMER_INTERVAL / 2)
+#define	TIMER_PULSE	TIMER_COUNT
+
+void reset_timer_masked(void)
+{
+	/* Set the hadware timer for 1ms */
+	ks8695_write(KS8695_TIMER1, TIMER_COUNT);
+	ks8695_write(KS8695_TIMER1_PCOUNT, TIMER_PULSE);
+	ks8695_write(KS8695_TIMER_CTRL, 0x2);
+	timer_ticks = 0;
+	timer_inited++;
+}
+
+void reset_timer(void)
+{
+	reset_timer_masked();
+}
+
+ulong get_timer_masked(void)
+{
+	/* Check for timer wrap */
+	if (ks8695_read(KS8695_INT_STATUS) & KS8695_INTMASK_TIMERINT1) {
+		/* Clear interrupt condition */
+		ks8695_write(KS8695_INT_STATUS, KS8695_INTMASK_TIMERINT1);
+		timer_ticks++;
+	}
+	return timer_ticks;
+}
+
+ulong get_timer(ulong base)
+{
+       return (get_timer_masked() - base);
+}
+
+void set_timer(ulong t)
+{
+	timer_ticks = t;
+}
+
+void udelay(ulong usec)
+{
+	ulong start = get_timer_masked();
+	ulong end;
+
+	if (!timer_inited)
+		reset_timer();
+
+	/* Only 1ms resolution :-( */
+	end = usec / 1000;
+	while (get_timer(start) < end)
+		;
+}
+
+void reset_cpu (ulong ignored)
+{
+	ulong tc;
+
+	/* Set timer0 to watchdog, and let it timeout */
+	tc = ks8695_read(KS8695_TIMER_CTRL) & 0x2;
+	ks8695_write(KS8695_TIMER_CTRL, tc);
+	ks8695_write(KS8695_TIMER0, ((10 << 8) | 0xff));
+	ks8695_write(KS8695_TIMER_CTRL, (tc | 0x1));
+
+	/* Should only wait here till watchdog resets */
+	for (;;)
+		;
+}
diff --git a/cpu/arm920t/ks8695/lowlevel_init.S b/cpu/arm920t/ks8695/lowlevel_init.S
new file mode 100644
index 0000000..e9f1227
--- /dev/null
+++ b/cpu/arm920t/ks8695/lowlevel_init.S
@@ -0,0 +1,205 @@
+/*
+ *  lowlevel_init.S - basic hardware initialization for the KS8695 CPU
+ *
+ *  Copyright (c) 2004-2005, Greg Ungerer <greg.ungerer@opengear.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 <config.h>
+#include <version.h>
+#include <asm/arch/platform.h>
+
+#ifndef CONFIG_SKIP_LOWLEVEL_INIT
+
+/*
+ *************************************************************************
+ *
+ * Handy dandy macros
+ *
+ *************************************************************************
+ */
+
+/* Delay a bit */
+.macro DELAY_FOR cycles, reg0
+	ldr     \reg0, =\cycles
+	subs    \reg0, \reg0, #1
+	subne   pc,  pc, #0xc
+.endm
+
+/*
+ *************************************************************************
+ *
+ * Some local storage.
+ *
+ *************************************************************************
+ */
+
+/* Should we boot with an interactive console or not */
+.globl serial_console
+
+/*
+ *************************************************************************
+ *
+ * Raw hardware initialization code. The important thing is to get
+ * SDRAM setup and running. We do some other basic things here too,
+ * like getting the PLL set for high speed, and init the LEDs.
+ *
+ *************************************************************************
+ */
+
+.globl lowlevel_init
+lowlevel_init:
+
+#if DEBUG
+	/*
+	 * enable UART for early debug trace
+	 */
+	ldr	r1, =(KS8695_IO_BASE+KS8695_UART_DIVISOR)
+	mov	r2, #0xd9
+	str	r2, [r1]		/* 115200 baud */
+	ldr	r1, =(KS8695_IO_BASE+KS8695_UART_LINE_CTRL)
+	mov	r2, #0x03
+	str	r2, [r1]		/* 8 data bits, no parity, 1 stop */
+	ldr	r1, =(KS8695_IO_BASE+KS8695_UART_TX_HOLDING)
+	mov	r2, #0x41
+	str	r2, [r1]		/* write 'A' */
+#endif
+#if DEBUG
+	ldr	r1, =(KS8695_IO_BASE+KS8695_UART_TX_HOLDING)
+	mov	r2, #0x42
+	str	r2, [r1]
+#endif
+
+	/*
+	 * remap the memory and flash regions. we want to end up with
+	 * ram from address 0, and flash at 32MB.
+	 */
+	ldr	r1, =(KS8695_IO_BASE+KS8695_MEM_CTRL0)
+	ldr	r2, =0xbfc00040
+	str	r2, [r1]		/* large flash map */
+	ldr	pc, =(highflash+0x02000000-0x00f00000)	/* jump to high flash address */
+highflash:
+	ldr	r2, =0x8fe00040
+	str	r2, [r1]		/* remap flash range */
+
+	/*
+	 * remap the second select region to the 4MB immediately after
+	 * the first region. This way if you have a larger flash (say 8Mb)
+	 * then you can have it all mapped nicely. Has no effect if you
+	 * only have a 4Mb or smaller flash.
+	 */
+	ldr	r1, =(KS8695_IO_BASE+KS8695_MEM_CTRL1)
+	ldr	r2, =0x9fe40040
+	str	r2, [r1]		/* remap flash2 region, contiguous */
+	ldr	r1, =(KS8695_IO_BASE+KS8695_MEM_GENERAL)
+	ldr	r2, =0x30000005
+	str	r2, [r1]		/* enable both flash selects */
+
+#ifdef CONFIG_CM41xx
+	/*
+	 * map the second flash chip, using the external IO lines.
+	 */
+	ldr	r1, =(KS8695_IO_BASE+KS8695_IO_CTRL0)
+	ldr	r2, =0xafe80b6d
+	str	r2, [r1]		/* remap io0 region, contiguous */
+	ldr	r1, =(KS8695_IO_BASE+KS8695_IO_CTRL1)
+	ldr	r2, =0xbfec0b6d
+	str	r2, [r1]		/* remap io1 region, contiguous */
+	ldr	r1, =(KS8695_IO_BASE+KS8695_MEM_GENERAL)
+	ldr	r2, =0x30050005
+	str	r2, [r1]		/* enable second flash */
+#endif
+
+	/*
+	 * before relocating, we have to setup RAM timing
+	 */
+	ldr	r1, =(KS8695_IO_BASE+KS8695_SDRAM_CTRL0)
+#if (PHYS_SDRAM_1_SIZE == 0x02000000)
+	ldr	r2, =0x7fc0000e		/* 32MB */
+#else
+	ldr	r2, =0x3fc0000e		/* 16MB */
+#endif
+	str	r2, [r1]		/* configure sdram bank0 setup */
+	ldr	r1, =(KS8695_IO_BASE+KS8695_SDRAM_CTRL1)
+	mov	r2, #0
+	str	r2, [r1]		/* configure sdram bank1 setup */
+
+	ldr	r1, =(KS8695_IO_BASE+KS8695_SDRAM_GENERAL)
+	ldr	r2, =0x0000000a
+	str	r2, [r1]		/* set RAS/CAS timing */
+
+	ldr	r1, =(KS8695_IO_BASE+KS8695_SDRAM_BUFFER)
+	ldr	r2, =0x00030000
+	str	r2, [r1]		/* send NOP command */
+	DELAY_FOR 0x100, r0
+	ldr	r2, =0x00010000
+	str	r2, [r1]		/* send PRECHARGE-ALL */
+	DELAY_FOR 0x100, r0
+
+	ldr	r1, =(KS8695_IO_BASE+KS8695_SDRAM_REFRESH)
+	ldr	r2, =0x00000020
+	str	r2, [r1]		/* set for fast refresh */
+	DELAY_FOR 0x100, r0
+	ldr	r2, =0x00000190
+	str	r2, [r1]		/* set normal refresh timing */
+
+	ldr	r1, =(KS8695_IO_BASE+KS8695_SDRAM_BUFFER)
+	ldr	r2, =0x00020033
+	str	r2, [r1]		/* send mode command */
+	DELAY_FOR 0x100, r0
+	ldr	r2, =0x01f00000
+	str	r2, [r1]		/* enable sdram fifos */
+
+	/*
+	 * set pll to top speed
+	 */
+	ldr	r1, =(KS8695_IO_BASE+KS8695_SYSTEN_BUS_CLOCK)
+	mov	r2, #0
+	str	r2, [r1]		/* set pll clock to 166MHz */
+
+	ldr	r1, =(KS8695_IO_BASE+KS8695_SWITCH_CTRL0)
+	ldr	r2, [r1]		/* Get switch ctrl0 register       */
+	and	r2, r2, #0x0fc00000	/* Mask out LED control bits       */
+	orr	r2, r2, #0x01800000	/* Set Link/activity/speed actions */
+	str	r2, [r1]
+
+#ifdef CONFIG_CM4008
+	ldr	r1, =(KS8695_IO_BASE+KS8695_GPIO_MODE)
+	ldr	r2, =0x0000fe30
+	str	r2, [r1]		/* enable LED's as outputs	    */
+	ldr	r1, =(KS8695_IO_BASE+KS8695_GPIO_DATA)
+	ldr	r2, =0x0000fe20
+	str	r2, [r1]		/* turn on power LED		    */
+#endif
+#if defined(CONFIG_CM4008) || defined(CONFIG_CM41xx)
+	ldr	r2, [r1]		/* get current GPIO input data	    */
+	tst	r2, #0x8		/* check if "erase" depressed	    */
+	beq	nobutton
+	mov	r2, #0			/* be quiet on boot, no console	    */
+	ldr	r1, =serial_console
+	str	r2, [r1]
+nobutton:
+#endif
+
+	add	lr, lr, #0x02000000	/* flash is now mapped high */
+	add	ip, ip, #0x02000000	/* this is a hack */
+	mov	pc, lr			/* all done, return */
+
+#endif /* CONFIG_SKIP_LOWLEVEL_INIT */
diff --git a/cpu/arm920t/ks8695/serial.c b/cpu/arm920t/ks8695/serial.c
new file mode 100644
index 0000000..0dd91e7
--- /dev/null
+++ b/cpu/arm920t/ks8695/serial.c
@@ -0,0 +1,116 @@
+/*
+ * serial.c -- KS8695 serial driver
+ *
+ * (C) Copyright 2004, Greg Ungerer <greg.ungerer@opengear.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 <asm/arch/platform.h>
+
+#ifndef CONFIG_SERIAL1
+#error "Bad: you didn't configure serial ..."
+#endif
+
+/*
+ *	Define the UART hardware register access structure.
+ */
+struct ks8695uart {
+	unsigned int	RX;		/* 0x00	- Receive data (r) */
+	unsigned int	TX;		/* 0x04	- Transmit data (w) */
+	unsigned int	FCR;		/* 0x08	- Fifo Control (r/w) */
+	unsigned int	LCR;		/* 0x0c	- Line Control (r/w) */
+	unsigned int	MCR;		/* 0x10	- Modem Control (r/w) */
+	unsigned int	LSR;		/* 0x14	- Line Status (r/w) */
+	unsigned int	MSR;		/* 0x18	- Modem Status (r/w) */
+	unsigned int	BD;		/* 0x1c	- Baud Rate (r/w) */
+	unsigned int	SR;		/* 0x20	- Status (r/w) */
+};
+
+#define	KS8695_UART_ADDR	((void *) (KS8695_IO_BASE + KS8695_UART_RX_BUFFER))
+#define	KS8695_UART_CLK		25000000
+
+
+/*
+ * Under some circumstances we want to be "quiet" and not issue any
+ * serial output - though we want u-boot to otherwise work and behave
+ * the same. By default be noisy.
+ */
+int serial_console = 1;
+
+
+void serial_setbrg(void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+	volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
+
+	/* Set to global baud rate and 8 data bits, no parity, 1 stop bit*/
+	uartp->BD = KS8695_UART_CLK / gd->baudrate;
+	uartp->LCR = KS8695_UART_LINEC_WLEN8;
+}
+
+int serial_init(void)
+{
+	serial_console = 1;
+	serial_setbrg();
+	return 0;
+}
+
+void serial_raw_putc(const char c)
+{
+	volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
+	int i;
+
+	for (i = 0; (i < 0x100000); i++) {
+		if (uartp->LSR & KS8695_UART_LINES_TXFE)
+			break;
+	}
+
+	uartp->TX = c;
+}
+
+void serial_putc(const char c)
+{
+	if (serial_console) {
+		serial_raw_putc(c);
+		if (c == '\n')
+			serial_raw_putc('\r');
+	}
+}
+
+int serial_tstc(void)
+{
+	volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
+	if (serial_console)
+		return ((uartp->LSR & KS8695_UART_LINES_RXFE) ? 1 : 0);
+	return 0;
+}
+
+void serial_puts(const char *s)
+{
+	char c;
+	while ((c = *s++) != 0)
+		serial_putc(c);
+}
+
+int serial_getc(void)
+{
+	volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
+
+	while ((uartp->LSR & KS8695_UART_LINES_RXFE) == 0)
+		;
+	return (uartp->RX);
+}