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authorwdenk <wdenk>2002-11-03 00:38:21 +0000
committerwdenk <wdenk>2002-11-03 00:38:21 +0000
commitfe8c2806cdba70479e351299881a395dc2be7785 (patch)
treea1e8b98a1838cba6e6f5c765d9d85339257c45f5 /cpu/sa1100
parentf9087a3213cc245cf9b90436475b5af822bd7579 (diff)
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Initial revision
Diffstat (limited to 'cpu/sa1100')
-rw-r--r--cpu/sa1100/serial.c158
-rw-r--r--cpu/sa1100/start.S422
2 files changed, 580 insertions, 0 deletions
diff --git a/cpu/sa1100/serial.c b/cpu/sa1100/serial.c
new file mode 100644
index 0000000..68bcd1f
--- /dev/null
+++ b/cpu/sa1100/serial.c
@@ -0,0 +1,158 @@
+/*
+ * (C) Copyright 2002
+ * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
+ *
+ * (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>
+ *
+ * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
+ *
+ * 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 <SA-1100.h>
+
+void serial_setbrg (void)
+{
+ DECLARE_GLOBAL_DATA_PTR;
+
+ unsigned int reg = 0;
+
+ if (gd->baudrate == 1200)
+ reg = 191;
+ else if (gd->baudrate == 9600)
+ reg = 23;
+ else if (gd->baudrate == 19200)
+ reg = 11;
+ else if (gd->baudrate == 38400)
+ reg = 5;
+ else if (gd->baudrate == 57600)
+ reg = 3;
+ else if (gd->baudrate == 115200)
+ reg = 1;
+ else
+ hang ();
+
+#ifdef CONFIG_SERIAL1
+ /* Wait until port is ready ... */
+ while (Ser1UTSR1 & UTSR1_TBY) {
+ }
+
+ /* init serial serial 1 */
+ Ser1UTCR3 = 0x00;
+ Ser1UTSR0 = 0xff;
+ Ser1UTCR0 = (UTCR0_1StpBit | UTCR0_8BitData);
+ Ser1UTCR1 = 0;
+ Ser1UTCR2 = (u32) reg;
+ Ser1UTCR3 = (UTCR3_RXE | UTCR3_TXE);
+#elif CONFIG_SERIAL3
+ /* Wait until port is ready ... */
+ while (Ser3UTSR1 & UTSR1_TBY) {
+ }
+
+ /* init serial serial 3 */
+ Ser3UTCR3 = 0x00;
+ Ser3UTSR0 = 0xff;
+ Ser3UTCR0 = (UTCR0_1StpBit | UTCR0_8BitData);
+ Ser3UTCR1 = 0;
+ Ser3UTCR2 = (u32) reg;
+ Ser3UTCR3 = (UTCR3_RXE | UTCR3_TXE);
+#else
+#error "Bad: you didn't configured serial ..."
+#endif
+}
+
+
+/*
+ * Initialise the serial port with the given baudrate. The settings
+ * are always 8 data bits, no parity, 1 stop bit, no start bits.
+ *
+ */
+int serial_init (void)
+{
+ serial_setbrg ();
+
+ return (0);
+}
+
+
+/*
+ * Output a single byte to the serial port.
+ */
+void serial_putc (const char c)
+{
+#ifdef CONFIG_SERIAL1
+ /* wait for room in the tx FIFO on SERIAL1 */
+ while ((Ser1UTSR0 & UTSR0_TFS) == 0);
+
+ Ser1UTDR = c;
+#elif CONFIG_SERIAL3
+ /* wait for room in the tx FIFO on SERIAL3 */
+ while ((Ser3UTSR0 & UTSR0_TFS) == 0);
+
+ Ser3UTDR = c;
+#endif
+
+ /* If \n, also do \r */
+ if (c == '\n')
+ serial_putc ('\r');
+}
+
+/*
+ * Read a single byte from the serial port. Returns 1 on success, 0
+ * otherwise. When the function is succesfull, the character read is
+ * written into its argument c.
+ */
+int serial_tstc (void)
+{
+#ifdef CONFIG_SERIAL1
+ return Ser1UTSR1 & UTSR1_RNE;
+#elif CONFIG_SERIAL3
+ return Ser3UTSR1 & UTSR1_RNE;
+#endif
+}
+
+/*
+ * Read a single byte from the serial port. Returns 1 on success, 0
+ * otherwise. When the function is succesfull, the character read is
+ * written into its argument c.
+ */
+int serial_getc (void)
+{
+#ifdef CONFIG_SERIAL1
+ while (!(Ser1UTSR1 & UTSR1_RNE));
+
+ return (char) Ser1UTDR & 0xff;
+#elif CONFIG_SERIAL3
+ while (!(Ser3UTSR1 & UTSR1_RNE));
+
+ return (char) Ser3UTDR & 0xff;
+#endif
+}
+
+void
+serial_puts (const char *s)
+{
+ while (*s) {
+ serial_putc (*s++);
+ }
+}
diff --git a/cpu/sa1100/start.S b/cpu/sa1100/start.S
new file mode 100644
index 0000000..c0f30f5
--- /dev/null
+++ b/cpu/sa1100/start.S
@@ -0,0 +1,422 @@
+/*
+ * armboot - Startup Code for SA1100 CPU
+ *
+ * Copyright (C) 1998 Dan Malek <dmalek@jlc.net>
+ * Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
+ * Copyright (C) 2000 Wolfgang Denk <wd@denx.de>
+ * Copyright (c) 2001 Alex Züpke <azu@sysgo.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 <version.h>
+
+
+/*
+ *************************************************************************
+ *
+ * Jump vector table as in table 3.1 in [1]
+ *
+ *************************************************************************
+ */
+
+
+.globl _start
+_start: b reset
+ ldr pc, _undefined_instruction
+ ldr pc, _software_interrupt
+ ldr pc, _prefetch_abort
+ ldr pc, _data_abort
+ ldr pc, _not_used
+ ldr pc, _irq
+ ldr pc, _fiq
+
+_undefined_instruction: .word undefined_instruction
+_software_interrupt: .word software_interrupt
+_prefetch_abort: .word prefetch_abort
+_data_abort: .word data_abort
+_not_used: .word not_used
+_irq: .word irq
+_fiq: .word fiq
+
+ .balignl 16,0xdeadbeef
+
+
+/*
+ *************************************************************************
+ *
+ * Startup Code (reset vector)
+ *
+ * do important init only if we don't start from memory!
+ * relocate armboot to ram
+ * setup stack
+ * jump to second stage
+ *
+ *************************************************************************
+ */
+
+/*
+ * CFG_MEM_END is in the board dependent config-file (configs/config_BOARD.h)
+ */
+_TEXT_BASE:
+ .word TEXT_BASE
+
+.globl _armboot_start
+_armboot_start:
+ .word _start
+
+/*
+ * Note: _armboot_end_data and _armboot_end are defined
+ * by the (board-dependent) linker script.
+ * _armboot_end_data is the first usable FLASH address after armboot
+ */
+.globl _armboot_end_data
+_armboot_end_data:
+ .word armboot_end_data
+.globl _armboot_end
+_armboot_end:
+ .word armboot_end
+
+/*
+ * _armboot_real_end is the first usable RAM address behind armboot
+ * and the various stacks
+ */
+.globl _armboot_real_end
+_armboot_real_end:
+ .word 0x0badc0de
+
+#ifdef CONFIG_USE_IRQ
+/* IRQ stack memory (calculated at run-time) */
+.globl IRQ_STACK_START
+IRQ_STACK_START:
+ .word 0x0badc0de
+
+/* IRQ stack memory (calculated at run-time) */
+.globl FIQ_STACK_START
+FIQ_STACK_START:
+ .word 0x0badc0de
+#endif
+
+
+/*
+ * the actual reset code
+ */
+
+reset:
+ /*
+ * set the cpu to SVC32 mode
+ */
+ mrs r0,cpsr
+ bic r0,r0,#0x1f
+ orr r0,r0,#0x13
+ msr cpsr,r0
+
+ /*
+ * we do sys-critical inits only at reboot,
+ * not when booting from ram!
+ */
+#ifdef CONFIG_INIT_CRITICAL
+ bl cpu_init_crit
+#endif
+
+relocate:
+ /*
+ * relocate armboot to RAM
+ */
+ adr r0, _start /* r0 <- current position of code */
+ ldr r2, _armboot_start
+ ldr r3, _armboot_end
+ sub r2, r3, r2 /* r2 <- size of armboot */
+ ldr r1, _TEXT_BASE /* r1 <- destination address */
+ add r2, r0, r2 /* r2 <- source end address */
+
+ /*
+ * r0 = source address
+ * r1 = target address
+ * r2 = source end address
+ */
+copy_loop:
+ ldmia r0!, {r3-r10}
+ stmia r1!, {r3-r10}
+ cmp r0, r2
+ ble copy_loop
+
+ /* set up the stack */
+ ldr r0, _armboot_end
+ add r0, r0, #CONFIG_STACKSIZE
+ sub sp, r0, #12 /* leave 3 words for abort-stack */
+
+ ldr pc, _start_armboot
+
+_start_armboot: .word start_armboot
+
+
+/*
+ *************************************************************************
+ *
+ * CPU_init_critical registers
+ *
+ * setup important registers
+ * setup memory timing
+ *
+ *************************************************************************
+ */
+
+
+/* Interupt-Controller base address */
+IC_BASE: .word 0x90050000
+#define ICMR 0x04
+
+
+/* Reset-Controller */
+RST_BASE: .word 0x90030000
+#define RSRR 0x00
+#define RCSR 0x04
+
+
+/* PWR */
+PWR_BASE: .word 0x90020000
+#define PSPR 0x08
+#define PPCR 0x14
+cpuspeed: .word CFG_CPUSPEED
+
+
+cpu_init_crit:
+ /*
+ * mask all IRQs
+ */
+ ldr r0, IC_BASE
+ mov r1, #0x00
+ str r1, [r0, #ICMR]
+
+ /* set clock speed */
+ ldr r0, PWR_BASE
+ ldr r1, cpuspeed
+ str r1, [r0, #PPCR]
+
+ /*
+ * before relocating, we have to setup RAM timing
+ * because memory timing is board-dependend, you will
+ * find a memsetup.S in your board directory.
+ */
+ mov ip, lr
+ bl memsetup
+ mov lr, ip
+
+ /*
+ * disable MMU stuff and enable I-cache
+ */
+ mrc p15,0,r0,c1,c0
+ bic r0, r0, #0x00002000 @ clear bit 13 (X)
+ bic r0, r0, #0x0000000f @ clear bits 3-0 (WCAM)
+ orr r0, r0, #0x00001000 @ set bit 12 (I) Icache
+ orr r0, r0, #0x00000002 @ set bit 2 (A) Align
+ mcr p15,0,r0,c1,c0
+
+ /*
+ * flush v4 I/D caches
+ */
+ mov r0, #0
+ mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */
+ mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */
+
+ mov pc, lr
+
+
+
+
+/*
+ *************************************************************************
+ *
+ * Interrupt handling
+ *
+ *************************************************************************
+ */
+
+@
+@ IRQ stack frame.
+@
+#define S_FRAME_SIZE 72
+
+#define S_OLD_R0 68
+#define S_PSR 64
+#define S_PC 60
+#define S_LR 56
+#define S_SP 52
+
+#define S_IP 48
+#define S_FP 44
+#define S_R10 40
+#define S_R9 36
+#define S_R8 32
+#define S_R7 28
+#define S_R6 24
+#define S_R5 20
+#define S_R4 16
+#define S_R3 12
+#define S_R2 8
+#define S_R1 4
+#define S_R0 0
+
+#define MODE_SVC 0x13
+#define I_BIT 0x80
+
+/*
+ * use bad_save_user_regs for abort/prefetch/undef/swi ...
+ * use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling
+ */
+
+ .macro bad_save_user_regs
+ sub sp, sp, #S_FRAME_SIZE
+ stmia sp, {r0 - r12} @ Calling r0-r12
+ add r8, sp, #S_PC
+
+ ldr r2, _armboot_end
+ add r2, r2, #CONFIG_STACKSIZE
+ sub r2, r2, #8
+ ldmia r2, {r2 - r4} @ get pc, cpsr, old_r0
+ add r0, sp, #S_FRAME_SIZE @ restore sp_SVC
+
+ add r5, sp, #S_SP
+ mov r1, lr
+ stmia r5, {r0 - r4} @ save sp_SVC, lr_SVC, pc, cpsr, old_r
+ mov r0, sp
+ .endm
+
+ .macro irq_save_user_regs
+ sub sp, sp, #S_FRAME_SIZE
+ stmia sp, {r0 - r12} @ Calling r0-r12
+ add r8, sp, #S_PC
+ stmdb r8, {sp, lr}^ @ Calling SP, LR
+ str lr, [r8, #0] @ Save calling PC
+ mrs r6, spsr
+ str r6, [r8, #4] @ Save CPSR
+ str r0, [r8, #8] @ Save OLD_R0
+ mov r0, sp
+ .endm
+
+ .macro irq_restore_user_regs
+ ldmia sp, {r0 - lr}^ @ Calling r0 - lr
+ mov r0, r0
+ ldr lr, [sp, #S_PC] @ Get PC
+ add sp, sp, #S_FRAME_SIZE
+ subs pc, lr, #4 @ return & move spsr_svc into cpsr
+ .endm
+
+ .macro get_bad_stack
+ ldr r13, _armboot_end @ setup our mode stack
+ add r13, r13, #CONFIG_STACKSIZE @ resides at top of normal stack
+ sub r13, r13, #8
+
+ str lr, [r13] @ save caller lr / spsr
+ mrs lr, spsr
+ str lr, [r13, #4]
+
+ mov r13, #MODE_SVC @ prepare SVC-Mode
+ msr spsr_c, r13
+ mov lr, pc
+ movs pc, lr
+ .endm
+
+ .macro get_irq_stack @ setup IRQ stack
+ ldr sp, IRQ_STACK_START
+ .endm
+
+ .macro get_fiq_stack @ setup FIQ stack
+ ldr sp, FIQ_STACK_START
+ .endm
+
+/*
+ * exception handlers
+ */
+ .align 5
+undefined_instruction:
+ get_bad_stack
+ bad_save_user_regs
+ bl do_undefined_instruction
+
+ .align 5
+software_interrupt:
+ get_bad_stack
+ bad_save_user_regs
+ bl do_software_interrupt
+
+ .align 5
+prefetch_abort:
+ get_bad_stack
+ bad_save_user_regs
+ bl do_prefetch_abort
+
+ .align 5
+data_abort:
+ get_bad_stack
+ bad_save_user_regs
+ bl do_data_abort
+
+ .align 5
+not_used:
+ get_bad_stack
+ bad_save_user_regs
+ bl do_not_used
+
+#ifdef CONFIG_USE_IRQ
+
+ .align 5
+irq:
+ get_irq_stack
+ irq_save_user_regs
+ bl do_irq
+ irq_restore_user_regs
+
+ .align 5
+fiq:
+ get_fiq_stack
+ /* someone ought to write a more effiction fiq_save_user_regs */
+ irq_save_user_regs
+ bl do_fiq
+ irq_restore_user_regs
+
+#else
+
+ .align 5
+irq:
+ get_bad_stack
+ bad_save_user_regs
+ bl do_irq
+
+ .align 5
+fiq:
+ get_bad_stack
+ bad_save_user_regs
+ bl do_fiq
+
+#endif
+
+ .align 5
+.globl reset_cpu
+reset_cpu:
+ ldr r0, RST_BASE
+ mov r1, #0x0 @ set bit 3-0 ...
+ str r1, [r0, #RCSR] @ ... to clear in RCSR
+ mov r1, #0x1
+ str r1, [r0, #RSRR] @ and perform reset
+ b reset_cpu @ silly, but repeat endlessly