* add at91 soc to arm920t, needs to join at91rm9200 into at91 arch
Signed-off-by: Jens Scharsig js_at_ng@scharsoft.de --- cpu/arm920t/at91/Makefile | 47 ++++++++++ cpu/arm920t/at91/lowlevel_init.S | 177 ++++++++++++++++++++++++++++++++++++++ cpu/arm920t/at91/reset.c | 58 ++++++++++++ cpu/arm920t/at91/timer.c | 166 +++++++++++++++++++++++++++++++++++ 4 files changed, 448 insertions(+), 0 deletions(-) create mode 100644 cpu/arm920t/at91/Makefile create mode 100644 cpu/arm920t/at91/lowlevel_init.S create mode 100644 cpu/arm920t/at91/reset.c create mode 100644 cpu/arm920t/at91/timer.c
diff --git a/cpu/arm920t/at91/Makefile b/cpu/arm920t/at91/Makefile new file mode 100644 index 0000000..6e683f6 --- /dev/null +++ b/cpu/arm920t/at91/Makefile @@ -0,0 +1,47 @@ +# +# (C) Copyright 2000-2006 +# 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 = $(obj)lib$(SOC).a + +SOBJS += lowlevel_init.o +COBJS += reset.o +COBJS += timer.o + +SRCS := $(SOBJS:.o=.S) $(COBJS:.o=.c) +OBJS := $(addprefix $(obj),$(SOBJS) $(COBJS)) + +all: $(obj).depend $(LIB) + +$(LIB): $(OBJS) + $(AR) $(ARFLAGS) $@ $(OBJS) + +######################################################################### + +# defines $(obj).depend target +include $(SRCTREE)/rules.mk + +sinclude $(obj).depend + +######################################################################### diff --git a/cpu/arm920t/at91/lowlevel_init.S b/cpu/arm920t/at91/lowlevel_init.S new file mode 100644 index 0000000..8e081dc --- /dev/null +++ b/cpu/arm920t/at91/lowlevel_init.S @@ -0,0 +1,177 @@ +/* + * Memory Setup stuff - taken from blob memsetup.S + * + * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl) and + * Jan-Derk Bakker (J.D.Bakker@its.tudelft.nl) + * + * Modified for the at91rm9200dk board by + * (C) Copyright 2004 + * Gary Jennejohn, DENX Software Engineering, garyj@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> + +#ifndef CONFIG_SKIP_LOWLEVEL_INIT + +#define AT91_PMC_MOR 0xFFFFFC20 /* Main oscillator register */ +#define AT91_PMC_PLLAR 0xFFFFFC28 +#define AT91_PMC_PLLBR 0xFFFFFC2C +#define AT91_PMC_MCKR 0xFFFFFC30 + +#define AT91_PIOC_ASR 0xFFFFF870 +#define AT91_PIOC_BSR 0xFFFFF874 +#define AT91_PIOC_PDR 0xFFFFF804 + +#define AT91_MC_EBI_CSA 0xFFFFFF60 +#define AT91_MC_EBI_CFG 0xFFFFFF64 +#define AT91_MC_SMC_CSR0 0xFFFFFF70 + +#define AT91_MC_SDRAMC_MR 0xFFFFFF90 +#define AT91_MC_SDRAMC_TR 0xFFFFFF94 +#define AT91_MC_SDRAMC_CR 0xFFFFFF98 + +_MTEXT_BASE: +#undef START_FROM_MEM +#ifdef START_FROM_MEM + .word TEXT_BASE-PHYS_FLASH_1 +#else + .word TEXT_BASE +#endif + +.globl lowlevel_init +lowlevel_init: + ldr r1, =AT91_PMC_MOR + /* Main oscillator Enable register */ +#ifdef CONFIG_SYS_USE_MAIN_OSCILLATOR + ldr r0, =0x0000FF01 /* Enable main oscillator, OSCOUNT = 0xFF */ +#else + ldr r0, =0x0000FF00 /* Disable main oscillator, OSCOUNT = 0xFF */ +#endif + str r0, [r1] /*AT91C_CKGR_MOR] */ + /* Add loop to compensate Main Oscillator startup time */ + ldr r0, =0x00000010 +LoopOsc: + subs r0, r0, #1 + bhi LoopOsc + + /* memory control configuration */ + /* this isn't very elegant, but what the heck */ + ldr r0, =SMRDATA + ldr r1, _MTEXT_BASE + sub r0, r0, r1 + add r2, r0, #80 +0: + /* the address */ + ldr r1, [r0], #4 + /* the value */ + ldr r3, [r0], #4 + str r3, [r1] + cmp r2, r0 + bne 0b + /* delay - this is all done by guess */ + ldr r0, =0x00010000 + /* (vs reading PMC_SR for LOCKA, LOCKB ... or MOSCS earlier) */ +1: + subs r0, r0, #1 + bhi 1b + ldr r0, =SMRDATA1 + ldr r1, _MTEXT_BASE + sub r0, r0, r1 + add r2, r0, #176 +2: + /* the address */ + ldr r1, [r0], #4 + /* the value */ + ldr r3, [r0], #4 + str r3, [r1] + cmp r2, r0 + bne 2b + + /* switch from FastBus to Asynchronous clock mode */ + mrc p15, 0, r0, c1, c0, 0 + orr r0, r0, #0xC0000000 @ set bit 31 (iA) and 30 (nF) + mcr p15, 0, r0, c1, c0, 0 + + /* everything is fine now */ + mov pc, lr + + .ltorg + +SMRDATA: + .word AT91_MC_EBI_CFG + .word CONFIG_SYS_EBI_CFGR_VAL + .word AT91_MC_SMC_CSR0 + .word CONFIG_SYS_SMC_CSR0_VAL + .word AT91_PMC_PLLAR + .word CONFIG_SYS_PLLAR_VAL + .word AT91_PMC_PLLBR + .word CONFIG_SYS_PLLBR_VAL + .word AT91_PMC_MCKR + .word CONFIG_SYS_MCKR_VAL + /* here there's a delay */ +SMRDATA1: + .word AT91_PIOC_ASR + .word CONFIG_SYS_PIOC_ASR_VAL + .word AT91_PIOC_BSR + .word CONFIG_SYS_PIOC_BSR_VAL + .word AT91_PIOC_PDR + .word CONFIG_SYS_PIOC_PDR_VAL + .word AT91_MC_EBI_CSA + .word CONFIG_SYS_EBI_CSA_VAL + .word AT91_MC_SDRAMC_CR + .word CONFIG_SYS_SDRC_CR_VAL + .word AT91_MC_SDRAMC_MR + .word CONFIG_SYS_SDRC_MR_VAL + .word CONFIG_SYS_SDRAM + .word CONFIG_SYS_SDRAM_VAL + .word AT91_MC_SDRAMC_MR + .word CONFIG_SYS_SDRC_MR_VAL1 + .word CONFIG_SYS_SDRAM + .word CONFIG_SYS_SDRAM_VAL + .word CONFIG_SYS_SDRAM + .word CONFIG_SYS_SDRAM_VAL + .word CONFIG_SYS_SDRAM + .word CONFIG_SYS_SDRAM_VAL + .word CONFIG_SYS_SDRAM + .word CONFIG_SYS_SDRAM_VAL + .word CONFIG_SYS_SDRAM + .word CONFIG_SYS_SDRAM_VAL + .word CONFIG_SYS_SDRAM + .word CONFIG_SYS_SDRAM_VAL + .word CONFIG_SYS_SDRAM + .word CONFIG_SYS_SDRAM_VAL + .word CONFIG_SYS_SDRAM + .word CONFIG_SYS_SDRAM_VAL + .word AT91_MC_SDRAMC_MR + .word CONFIG_SYS_SDRC_MR_VAL2 + .word CONFIG_SYS_SDRAM1 + .word CONFIG_SYS_SDRAM_VAL + .word AT91_MC_SDRAMC_TR + .word CONFIG_SYS_SDRC_TR_VAL + .word CONFIG_SYS_SDRAM + .word CONFIG_SYS_SDRAM_VAL + .word AT91_MC_SDRAMC_MR + .word CONFIG_SYS_SDRC_MR_VAL3 + .word CONFIG_SYS_SDRAM + .word CONFIG_SYS_SDRAM_VAL + /* SMRDATA1 is 176 bytes long */ +#endif /* CONFIG_SKIP_LOWLEVEL_INIT */ diff --git a/cpu/arm920t/at91/reset.c b/cpu/arm920t/at91/reset.c new file mode 100644 index 0000000..ab05167 --- /dev/null +++ b/cpu/arm920t/at91/reset.c @@ -0,0 +1,58 @@ +/* + * (C) Copyright 2002 + * Lineo, Inc. <www.lineo.com> + * Bernhard Kuhn bkuhn@lineo.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 + * + * 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/io.h> +#include <asm/arch/hardware.h> +#include <asm/arch/at91_st.h> + +void board_reset(void) __attribute__((__weak__)); + +void reset_cpu (ulong ignored) +{ + at91_st_t *st = (at91_st_t *) AT91_ST_BASE; +#if defined(CONFIG_AT91RM9200_USART) || defined(CONFIG_AT91_USART) + /*shutdown the console to avoid strange chars during reset */ + serial_exit(); +#endif + + if (board_reset) + board_reset(); + + /* Reset the cpu by setting up the watchdog timer */ + writel(AT91_ST_WDMR_RSTEN | AT91_ST_WDMR_EXTEN | AT91_ST_WDMR_WDV(2), + &st->wdmr); + writel(AT91_ST_CR_WDRST, &st->cr); + /* and let him time out */ + while (1); + /* Never reached */ +} diff --git a/cpu/arm920t/at91/timer.c b/cpu/arm920t/at91/timer.c new file mode 100644 index 0000000..ea7698a --- /dev/null +++ b/cpu/arm920t/at91/timer.c @@ -0,0 +1,166 @@ +/* + * (C) Copyright 2002 + * Lineo, Inc. <www.lineo.com> + * Bernhard Kuhn bkuhn@lineo.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 + * + * 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/io.h> +#include <asm/hardware.h> +#include <asm/arch/at91_tc.h> +#include <asm/arch/at91_pmc.h> + +/* the number of clocks per CONFIG_SYS_HZ */ +#define TIMER_LOAD_VAL (CONFIG_SYS_HZ_CLOCK/CONFIG_SYS_HZ) + +/* macro to read the 16 bit timer */ +//#define READ_TIMER (tmr->TC_CV & 0x0000ffff) +/*#AT91PS_TC tmr; */ + +static u32 timestamp; +static u32 lastinc; + +int timer_init (void) +{ + at91_tc_t *tc = (at91_tc_t *) AT91_TC_BASE; + at91_pmc_t *pmc = (at91_pmc_t *) AT91_PMC_BASE; + + /* enables TC1.0 clock */ + writel(1 << AT91_ID_TC0, &pmc->pcer); /* enable clock */ + + writel(0, &tc->bcr); + writel(AT91_TC_BMR_TC0XC0S_NONE | AT91_TC_BMR_TC1XC1S_NONE | + AT91_TC_BMR_TC2XC2S_NONE , &tc->bmr); + + writel(AT91_TC_CCR_CLKDIS, &tc->tc[0].ccr); + /* set to MCLK/2 and restart the timer when the vlaue in TC_RC is reached */ + writel(AT91_TC_CMR_TCCLKS_CLOCK1 | AT91_TC_CMR_CPCTRG, &tc->tc[0].cmr); + + writel(0xFFFFFFFF, &tc->tc[0].idr); /* disable interupts */ + writel(TIMER_LOAD_VAL, &tc->tc[0].rc); + + writel(AT91_TC_CCR_SWTRG | AT91_TC_CCR_CLKEN, &tc->tc[0].ccr); + lastinc = 0; + timestamp = 0; + + return (0); +} + +/* + * timer without interrupts + */ + +void reset_timer (void) +{ + reset_timer_masked (); +} + +ulong get_timer (ulong base) +{ + return get_timer_masked () - base; +} + +void set_timer (ulong t) +{ + timestamp = t; +} + +void __udelay (unsigned long usec) +{ + udelay_masked(usec); +} + +void reset_timer_masked (void) +{ + /* reset time */ + at91_tc_t *tc = (at91_tc_t *) AT91_TC_BASE; + lastinc = readl(&tc->tc[0].cv) & 0x0000ffff; + timestamp = 0; +} + +ulong get_timer_raw (void) +{ + at91_tc_t *tc = (at91_tc_t *) AT91_TC_BASE; + u32 now; + + now = readl(&tc->tc[0].cv) & 0x0000ffff; + + if (now >= lastinc) { + /* normal mode */ + timestamp += now - lastinc; + } else { + /* we have an overflow ... */ + timestamp += now + TIMER_LOAD_VAL - lastinc; + } + lastinc = now; + + return timestamp; +} + +ulong get_timer_masked (void) +{ + return get_timer_raw()/TIMER_LOAD_VAL; +} + +void udelay_masked (unsigned long usec) +{ + u32 tmo; + u32 endtime; + signed long diff; + + tmo = CONFIG_SYS_HZ_CLOCK / 1000; + tmo *= usec; + tmo /= 1000; + + endtime = get_timer_raw () + tmo; + + do { + u32 now = get_timer_raw (); + diff = endtime - now; + } while (diff >= 0); +} + +/* + * 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 CONFIG_SYS_HZ; +}