diff options
Diffstat (limited to 'cpu')
| -rw-r--r-- | cpu/mc9328/Makefile | 43 | ||||
| -rw-r--r-- | cpu/mc9328/config.mk | 27 | ||||
| -rw-r--r-- | cpu/mc9328/cpu.c | 183 | ||||
| -rw-r--r-- | cpu/mc9328/interrupts.c | 250 | ||||
| -rw-r--r-- | cpu/mc9328/serial.c | 146 | ||||
| -rw-r--r-- | cpu/mc9328/start.S | 388 |
6 files changed, 1037 insertions, 0 deletions
diff --git a/cpu/mc9328/Makefile b/cpu/mc9328/Makefile new file mode 100644 index 0000000000..0261ba6e7b --- /dev/null +++ b/cpu/mc9328/Makefile @@ -0,0 +1,43 @@ +# +# (C) Copyright 2000, 2001, 2002 +# 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 $(TOPDIR)/config.mk + +LIB = lib$(CPU).a + +START = start.o +OBJS = serial.o interrupts.o cpu.o + +all: .depend $(START) $(LIB) + +$(LIB): $(OBJS) + $(AR) crv $@ $(OBJS) + +######################################################################### + +.depend: Makefile $(START:.o=.S) $(OBJS:.o=.c) + $(CC) -M $(CFLAGS) $(START:.o=.S) $(OBJS:.o=.c) > $@ + +sinclude .depend + +######################################################################### diff --git a/cpu/mc9328/config.mk b/cpu/mc9328/config.mk new file mode 100644 index 0000000000..cef7d26f1c --- /dev/null +++ b/cpu/mc9328/config.mk @@ -0,0 +1,27 @@ +# +# (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 \ + -mshort-load-bytes -msoft-float + +PLATFORM_CPPFLAGS += -mapcs-32 -march=armv4 diff --git a/cpu/mc9328/cpu.c b/cpu/mc9328/cpu.c new file mode 100644 index 0000000000..2a2b578017 --- /dev/null +++ b/cpu/mc9328/cpu.c @@ -0,0 +1,183 @@ +/* + * (C) Copyright 2002 + * Sysgo Real-Time Solutions, GmbH <www.elinos.com> + * Marius Groeger <mgroeger@sysgo.de> + * + * (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 + */ + +/* + * CPU specific code + */ + +#include <common.h> +#include <command.h> +#include <arm920t.h> + +/* read co-processor 15, register #1 (control register) */ +static unsigned long read_p15_c1 (void) +{ + unsigned long value; + + __asm__ __volatile__( + "mrc p15, 0, %0, c1, c0, 0 @ read control reg\n" + : "=r" (value) + : + : "memory"); + +#ifdef MMU_DEBUG + printf ("p15/c1 is = %08lx\n", value); +#endif + return value; +} + +/* write to co-processor 15, register #1 (control register) */ +static void write_p15_c1 (unsigned long value) +{ +#ifdef MMU_DEBUG + printf ("write %08lx to p15/c1\n", value); +#endif + __asm__ __volatile__( + "mcr p15, 0, %0, c1, c0, 0 @ write it back\n" + : + : "r" (value) + : "memory"); + + read_p15_c1 (); +} + +static void cp_delay (void) +{ + volatile int i; + + /* copro seems to need some delay between reading and writing */ + for (i = 0; i < 100; i++); +} + +/* See also ARM Ref. Man. */ +#define C1_MMU (1<<0) /* mmu off/on */ +#define C1_ALIGN (1<<1) /* alignment faults off/on */ +#define C1_DC (1<<2) /* dcache off/on */ +#define C1_BIG_ENDIAN (1<<7) /* big endian off/on */ +#define C1_SYS_PROT (1<<8) /* system protection */ +#define C1_ROM_PROT (1<<9) /* ROM protection */ +#define C1_IC (1<<12) /* icache off/on */ +#define C1_HIGH_VECTORS (1<<13) /* location of vectors: low/high addresses */ +#define RESERVED_1 (0xf << 3) /* must be 111b for R/W */ + +int cpu_init (void) +{ + /* + * setup up stacks if necessary + */ +#ifdef CONFIG_USE_IRQ + DECLARE_GLOBAL_DATA_PTR; + + IRQ_STACK_START = _armboot_start - CFG_MALLOC_LEN - CFG_GBL_DATA_SIZE - 4; + FIQ_STACK_START = IRQ_STACK_START - CONFIG_STACKSIZE_IRQ; +#endif + return 0; +} + +int cleanup_before_linux (void) +{ + /* + * this function is called just before we call linux + * it prepares the processor for linux + * + * we turn off caches etc ... + */ + + unsigned long i; + + disable_interrupts (); + + /* turn off I/D-cache */ + asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i)); + i &= ~(C1_DC | C1_IC); + asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i)); + + /* flush I/D-cache */ + i = 0; + asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i)); + return (0); +} + +int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +{ + extern void reset_cpu (ulong addr); + + disable_interrupts (); + reset_cpu (0); + /*NOTREACHED*/ + return (0); +} + +void icache_enable (void) +{ + ulong reg; + + reg = read_p15_c1 (); + cp_delay (); + write_p15_c1 (reg | C1_IC); +} + +void icache_disable (void) +{ + ulong reg; + + reg = read_p15_c1 (); + cp_delay (); + write_p15_c1 (reg & ~C1_IC); +} + +int icache_status (void) +{ + return (read_p15_c1 () & C1_IC) != 0; +} + +#ifdef USE_920T_MMU +/* It makes no sense to use the dcache if the MMU is not enabled */ +void dcache_enable (void) +{ + ulong reg; + + reg = read_p15_c1 (); + cp_delay (); + write_p15_c1 (reg | C1_DC); +} + +void dcache_disable (void) +{ + ulong reg; + + reg = read_p15_c1 (); + cp_delay (); + reg &= ~C1_DC; + write_p15_c1 (reg); +} + +int dcache_status (void) +{ + return (read_p15_c1 () & C1_DC) != 0; +} +#endif diff --git a/cpu/mc9328/interrupts.c b/cpu/mc9328/interrupts.c new file mode 100644 index 0000000000..3a922cfc4f --- /dev/null +++ b/cpu/mc9328/interrupts.c @@ -0,0 +1,250 @@ +/* + * (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> + * + * 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 <arm920t.h> +#include <mc9328.h> + +#include <asm/proc-armv/ptrace.h> + +extern void reset_cpu(ulong addr); +int timer_load_val = 0; + +#ifdef CONFIG_USE_IRQ +/* enable IRQ interrupts */ +void enable_interrupts (void) +{ + unsigned long temp; + __asm__ __volatile__("mrs %0, cpsr\n" + "bic %0, %0, #0x80\n" + "msr cpsr_c, %0" + : "=r" (temp) + : + : "memory"); +} + + +/* + * disable IRQ/FIQ interrupts + * returns true if interrupts had been enabled before we disabled them + */ +int disable_interrupts (void) +{ + unsigned long old,temp; + __asm__ __volatile__("mrs %0, cpsr\n" + "orr %1, %0, #0xc0\n" + "msr cpsr_c, %1" + : "=r" (old), "=r" (temp) + : + : "memory"); + return (old & 0x80) == 0; +} +#else +void enable_interrupts (void) +{ + return; +} +int disable_interrupts (void) +{ + return 0; +} +#endif + + +void bad_mode (void) +{ + panic ("Resetting CPU ...\n"); + reset_cpu (0); +} + +void show_regs (struct pt_regs *regs) +{ + unsigned long flags; + const char *processor_modes[] = { + "USER_26", "FIQ_26", "IRQ_26", "SVC_26", + "UK4_26", "UK5_26", "UK6_26", "UK7_26", + "UK8_26", "UK9_26", "UK10_26", "UK11_26", + "UK12_26", "UK13_26", "UK14_26", "UK15_26", + "USER_32", "FIQ_32", "IRQ_32", "SVC_32", + "UK4_32", "UK5_32", "UK6_32", "ABT_32", + "UK8_32", "UK9_32", "UK10_32", "UND_32", + "UK12_32", "UK13_32", "UK14_32", "SYS_32", + }; + + flags = condition_codes (regs); + + printf ("pc : [<%08lx>] lr : [<%08lx>]\n" + "sp : %08lx ip : %08lx fp : %08lx\n", + instruction_pointer (regs), + regs->ARM_lr, regs->ARM_sp, regs->ARM_ip, regs->ARM_fp); + printf ("r10: %08lx r9 : %08lx r8 : %08lx\n", + regs->ARM_r10, regs->ARM_r9, regs->ARM_r8); + printf ("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n", + regs->ARM_r7, regs->ARM_r6, regs->ARM_r5, regs->ARM_r4); + printf ("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n", + regs->ARM_r3, regs->ARM_r2, regs->ARM_r1, regs->ARM_r0); + printf ("Flags: %c%c%c%c", + flags & CC_N_BIT ? 'N' : 'n', + flags & CC_Z_BIT ? 'Z' : 'z', + flags & CC_C_BIT ? 'C' : 'c', flags & CC_V_BIT ? 'V' : 'v'); + printf (" IRQs %s FIQs %s Mode %s%s\n", + interrupts_enabled (regs) ? "on" : "off", + fast_interrupts_enabled (regs) ? "on" : "off", + processor_modes[processor_mode (regs)], + thumb_mode (regs) ? " (T)" : ""); +} + +void do_undefined_instruction (struct pt_regs *pt_regs) +{ + printf ("undefined instruction\n"); + show_regs (pt_regs); + bad_mode (); +} + +void do_software_interrupt (struct pt_regs *pt_regs) +{ + printf ("software interrupt\n"); + show_regs (pt_regs); + bad_mode (); +} + +void do_prefetch_abort (struct pt_regs *pt_regs) +{ + printf ("prefetch abort\n"); + show_regs (pt_regs); + bad_mode (); +} + +void do_data_abort (struct pt_regs *pt_regs) +{ + printf ("data abort\n"); + show_regs (pt_regs); + bad_mode (); +} + +void do_not_used (struct pt_regs *pt_regs) +{ + printf ("not used\n"); + show_regs (pt_regs); + bad_mode (); +} + +void do_fiq (struct pt_regs *pt_regs) +{ + printf ("fast interrupt request\n"); + show_regs (pt_regs); + bad_mode (); +} + +void do_irq (struct pt_regs *pt_regs) +{ + printf ("interrupt request\n"); + show_regs (pt_regs); + bad_mode (); +} + + +int interrupt_init (void) +{ + +/* we don't use interrupt */ + return(0); +} + +/* + * timer without interrupts + */ + +void reset_timer (void) +{ + reset_timer_masked (); +} + +ulong get_timer (ulong base) +{ + return get_timer_masked (); +} + +void set_timer (ulong t) +{ +/* Nop */ +} + +void udelay (unsigned long usec) +{ + udelay_masked (usec); +} + +void reset_timer_masked (void) +{ + u32 tmp; + MX1_TCTL1 = 0x09; + tmp = 0x1f; /* a little delay for timer to reset */ + MX1_TPRER1 = 0x1f; + MX1_TCTL1 = 0x19; +} + +ulong get_timer_masked (void) +{ + return MX1_TCN1; +} + +void udelay_masked (unsigned long usec) +{ + ulong tmo; + + tmo = usec / 1000; + tmo *= CFG_HZ; + tmo /= 1000; + + reset_timer_masked (); + + while (get_timer_masked () < tmo); +} + +/* + * 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) +{ + return get_timer(0); +} + +/* + * 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) { + return CFG_HZ; +} + diff --git a/cpu/mc9328/serial.c b/cpu/mc9328/serial.c new file mode 100644 index 0000000000..45b6f8afd4 --- /dev/null +++ b/cpu/mc9328/serial.c @@ -0,0 +1,146 @@ +/* + * cpu/mc9328/serial.c + * + * (c) Copyright 2004 + * Techware Information Technology, Inc. + * http://www.techware.com.tw/ + * + * Ming-Len Wu <minglen_wu@techware.com.tw> + * + * 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 <mc9328.h> + +#if defined(CONFIG_UART1) +/* GPIO PORT B */ + +#define reg_GIUS MX1_GIUS_C +#define reg_GPR MX1_GPR_B +#define GPIO_MASK 0xFFFFE1FF +#define UART_BASE 0x00206000 + + +#elif defined (CONFIG_UART2) +/* GPIO PORT C */ + +#define reg_GIUS MX1_GIUS_C +#define reg_GPR MX1_GPR_C +#define GPIO_MASK 0x0FFFFFFF +#define UART_BASE 0x207000 + +#endif + +#define reg_URXD (*((volatile u32 *)(UART_BASE+0x00))) +#define reg_UTXD (*((volatile u32 *)(UART_BASE+0x40))) +#define reg_UCR1 (*((volatile u32 *)(UART_BASE+0x80))) +#define reg_UCR2 (*((volatile u32 *)(UART_BASE+0x84))) +#define reg_UCR3 (*((volatile u32 *)(UART_BASE+0x88))) +#define reg_UCR4 (*((volatile u32 *)(UART_BASE+0x8C))) +#define reg_UFCR (*((volatile u32 *)(UART_BASE+0x90))) +#define reg_USR1 (*((volatile u32 *)(UART_BASE+0x94))) +#define reg_USR2 (*((volatile u32 *)(UART_BASE+0x98))) +#define reg_UESC (*((volatile u32 *)(UART_BASE+0x9C))) +#define reg_UTIM (*((volatile u32 *)(UART_BASE+0xA0))) +#define reg_UBIR (*((volatile u32 *)(UART_BASE+0xA4))) +#define reg_UBMR (*((volatile u32 *)(UART_BASE+0xA8))) +#define reg_UBRC (*((volatile u32 *)(UART_BASE+0xAC))) + +#define TXFE_MASK 0x4000 /* Tx buffer empty */ +#define RDR_MASK 0x0001 /* receive data ready */ + + +void serial_setbrg (void) { + +/* config I/O pins for UART */ + + reg_GIUS &= GPIO_MASK; + reg_GPR &= GPIO_MASK; + +/* config UART */ + + reg_UCR1 = 5; + reg_UCR2 = 0x4027; + reg_UCR4 = 1; + reg_UFCR = 0xA81; + + reg_UBIR = 0xF; + reg_UBMR = 0x8A; + reg_UBRC = 8; +} + + + +/* + * 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); +} + + + +/* + * 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) { + + while (!(reg_USR2 & RDR_MASK)) ; /* wait until RDR bit set */ + + return (u8)reg_URXD; +} + + +/* + * Output a single byte to the serial port. + */ +void serial_putc (const char c) { + + while (!(reg_USR2 & TXFE_MASK)); /* wait until TXFE bit set */ + + reg_UTXD = (u16) c; + + if (c == '\n') { /* carriage return ? append line-feed */ + while (!(reg_USR2 & TXFE_MASK)); /* wait until TXFE bit set */ + reg_UTXD = '\r'; + } + +} + + +/* + * Test whether a character is in the RX buffer + */ +int serial_tstc (void) { + return reg_USR2 & RDR_MASK; +} + + +void serial_puts (const char *s) { + while (*s) { + serial_putc (*s++); + } +} + diff --git a/cpu/mc9328/start.S b/cpu/mc9328/start.S new file mode 100644 index 0000000000..edfce121b7 --- /dev/null +++ b/cpu/mc9328/start.S @@ -0,0 +1,388 @@ +/* + * armboot - Startup Code for ARM920 CPU-core + * + * Copyright (c) 2001 Marius Gröger <mag@sysgo.de> + * Copyright (c) 2002 Alex Züpke <azu@sysgo.de> + * Copyright (c) 2002 Gary Jennejohn <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 + */ + + +#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 + * + ************************************************************************* + */ + +_TEXT_BASE: + .word TEXT_BASE + +.globl _armboot_start +_armboot_start: + .word _start + +/* + * These are defined in the board-specific linker script. + */ +.globl _bss_start +_bss_start: + .word __bss_start + +.globl _bss_end +_bss_end: + .word _end + +#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,#0xd3 + 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 U-Boot to RAM */ + adr r0, _start /* r0 <- current position of code */ + ldr r1, _TEXT_BASE /* test if we run from flash or RAM */ + cmp r0, r1 /* don't reloc during debug */ + beq stack_setup + + ldr r2, _armboot_start + ldr r3, _bss_start + sub r2, r3, r2 /* r2 <- size of armboot */ + add r2, r0, r2 /* r2 <- source end address */ + +copy_loop: + ldmia r0!, {r3-r10} /* copy from source address [r0] */ + stmia r1!, {r3-r10} /* copy to target address [r1] */ + cmp r0, r2 /* until source end addreee [r2] */ + ble copy_loop + + /* Set up the stack */ +stack_setup: + ldr r0, _TEXT_BASE /* upper 128 KiB: relocated uboot */ + sub r0, r0, #CFG_MALLOC_LEN /* malloc area */ + sub r0, r0, #CFG_GBL_DATA_SIZE /* bdinfo */ +#ifdef CONFIG_USE_IRQ + sub r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ) +#endif + sub sp, r0, #12 /* leave 3 words for abort-stack */ + +clear_bss: + ldr r0, _bss_start /* find start of bss segment */ + ldr r1, _bss_end /* stop here */ + mov r2, #0x00000000 /* clear */ + +clbss_l:str r2, [r0] /* clear loop... */ + add r0, r0, #4 + cmp r0, r1 + bne clbss_l + + ldr pc, _start_armboot + +_start_armboot: .word start_armboot + + +/* + ************************************************************************* + * + * CPU_init_critical registers + * + * setup important registers + * setup memory timing + * + ************************************************************************* + */ + + +cpu_init_crit: + /* + * 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 */ + + /* + * disable MMU stuff and caches + */ + mrc p15, 0, r0, c1, c0, 0 + bic r0, r0, #0x00002300 @ clear bits 13, 9:8 (--V- --RS) + bic r0, r0, #0x00000087 @ clear bits 7, 2:0 (B--- -CAM) + orr r0, r0, #0x00000002 @ set bit 2 (A) Align + orr r0, r0, #0x00001000 @ set bit 12 (I) I-Cache + mcr p15, 0, r0, c1, c0, 0 + + + /* + * 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 + + 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 + ldr r2, _armboot_start + sub r2, r2, #(CONFIG_STACKSIZE+CFG_MALLOC_LEN) + sub r2, r2, #(CFG_GBL_DATA_SIZE+8) @ set base 2 words into abort stack + ldmia r2, {r2 - r3} @ get pc, cpsr + add r0, sp, #S_FRAME_SIZE @ restore sp_SVC + + add r5, sp, #S_SP + mov r1, lr + stmia r5, {r0 - r3} @ save sp_SVC, lr_SVC, pc, cpsr + 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_start @ setup our mode stack + sub r13, r13, #(CONFIG_STACKSIZE+CFG_MALLOC_LEN) + sub r13, r13, #(CFG_GBL_DATA_SIZE+8) @ reserved a couple spots in abort stack + + 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 + msr spsr, 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: + mov ip, #0 + mcr p15, 0, ip, c7, c7, 0 @ invalidate cache + mcr p15, 0, ip, c8, c7, 0 @ flush TLB (v4) + mrc p15, 0, ip, c1, c0, 0 @ get ctrl register + bic ip, ip, #0x000f @ ............wcam + bic ip, ip, #0x2100 @ ..v....s........ + mcr p15, 0, ip, c1, c0, 0 @ ctrl register + mov pc, r0 |