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authorwdenk <wdenk>2005-05-19 22:39:42 +0000
committerwdenk <wdenk>2005-05-19 22:39:42 +0000
commit3a574cbe72e7d8be2b367c6d7ad9c06f53e4c957 (patch)
tree19d7c5acc132afb14e66c3c6385949e0bc4119f6 /cpu/arm920t
parent7680c140af9cac62c834f30d2d3c1479723ced69 (diff)
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* 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
Diffstat (limited to 'cpu/arm920t')
-rw-r--r--cpu/arm920t/ks8695/Makefile43
-rw-r--r--cpu/arm920t/ks8695/interrupts.c112
-rw-r--r--cpu/arm920t/ks8695/lowlevel_init.S205
-rw-r--r--cpu/arm920t/ks8695/serial.c116
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);
+}