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ARM: at91: Fix at91sam9g45 and at91cap9 reset 

As on the other sam9 we need to cleanly shutdown the DDRAM before rebooting.

On those SoC the SDRAM/DDRAM controller is different. So, the assembly code
ends up being not cleanly combined with previous at91sam9_alt_restart function.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
This commit is contained in:
Jean-Christophe PLAGNIOL-VILLARD 2011-11-18 01:41:28 +08:00 committed by Nicolas Ferre
parent e9f68b5cc6
commit 14f991a730
6 changed files with 48 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
arch/arm/mach-at91/Kconfig
View File

@ -21,6 +21,9 @@ config HAVE_AT91_USART5
config AT91_SAM9_ALT_RESET
bool
config AT91_SAM9G45_RESET
bool
menu "Atmel AT91 System-on-Chip"
choice
@ -97,6 +100,7 @@ config ARCH_AT91SAM9G45
select HAVE_FB_ATMEL
select HAVE_NET_MACB
select HAVE_AT91_DBGU1
select AT91_SAM9G45_RESET
config ARCH_AT91CAP9
bool "AT91CAP9"
@ -105,6 +109,7 @@ config ARCH_AT91CAP9
select HAVE_FB_ATMEL
select HAVE_NET_MACB
select HAVE_AT91_DBGU1
select AT91_SAM9G45_RESET
config ARCH_AT91X40
bool "AT91x40"

1
arch/arm/mach-at91/Makefile
View File

@ -9,6 +9,7 @@ obj- :=
obj-$(CONFIG_AT91_PMC_UNIT) += clock.o
obj-$(CONFIG_AT91_SAM9_ALT_RESET) += at91sam9_alt_reset.o
obj-$(CONFIG_AT91_SAM9G45_RESET) += at91sam9g45_reset.o
# CPU-specific support
obj-$(CONFIG_ARCH_AT91RM9200) += at91rm9200.o at91rm9200_time.o at91rm9200_devices.o

8
arch/arm/mach-at91/at91cap9.c
View File

@ -21,7 +21,6 @@
#include <mach/cpu.h>
#include <mach/at91cap9.h>
#include <mach/at91_pmc.h>
#include <mach/at91_rstc.h>
#include "soc.h"
#include "generic.h"
@ -314,11 +313,6 @@ static struct at91_gpio_bank at91cap9_gpio[] __initdata = {
}
};
static void at91cap9_restart(char mode, const char *cmd)
{
at91_sys_write(AT91_RSTC_CR, AT91_RSTC_KEY | AT91_RSTC_PROCRST | AT91_RSTC_PERRST);
}
/* --------------------------------------------------------------------
* AT91CAP9 processor initialization
* -------------------------------------------------------------------- */
@ -338,7 +332,7 @@ static void __init at91cap9_ioremap_registers(void)
static void __init at91cap9_initialize(void)
{
arm_pm_restart = at91cap9_restart;
arm_pm_restart = at91sam9g45_restart;
at91_extern_irq = (1 << AT91CAP9_ID_IRQ0) | (1 << AT91CAP9_ID_IRQ1);
/* Register GPIO subsystem */

6
arch/arm/mach-at91/at91sam9g45.c
View File

@ -18,7 +18,6 @@
#include <asm/mach/map.h>
#include <mach/at91sam9g45.h>
#include <mach/at91_pmc.h>
#include <mach/at91_rstc.h>
#include <mach/cpu.h>
#include "soc.h"
@ -318,11 +317,6 @@ static struct at91_gpio_bank at91sam9g45_gpio[] __initdata = {
}
};
static void at91sam9g45_restart(char mode, const char *cmd)
{
at91_sys_write(AT91_RSTC_CR, AT91_RSTC_KEY | AT91_RSTC_PROCRST | AT91_RSTC_PERRST);
}
/* --------------------------------------------------------------------
* AT91SAM9G45 processor initialization
* -------------------------------------------------------------------- */

40
arch/arm/mach-at91/at91sam9g45_reset.S Normal file
View File

@ -0,0 +1,40 @@
/*
* reset AT91SAM9G45 as per errata
*
* Copyright (C) 2011 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcosoft.com>
*
* unless the SDRAM is cleanly shutdown before we hit the
* reset register it can be left driving the data bus and
* killing the chance of a subsequent boot from NAND
*
* GPLv2 Only
*/
#include <linux/linkage.h>
#include <mach/hardware.h>
#include <mach/at91sam9_ddrsdr.h>
#include <mach/at91_rstc.h>
.arm
.globl at91sam9g45_restart
at91sam9g45_restart:
ldr r0, .at91_va_base_sdramc0 @ preload constants
ldr r1, =at91_rstc_base
ldr r1, [r1]
mov r2, #1
mov r3, #AT91_DDRSDRC_LPCB_POWER_DOWN
ldr r4, =AT91_RSTC_KEY | AT91_RSTC_PERRST | AT91_RSTC_PROCRST
.balign 32 @ align to cache line
str r2, [r0, #AT91_DDRSDRC_RTR] @ disable DDR0 access
str r3, [r0, #AT91_DDRSDRC_LPR] @ power down DDR0
str r4, [r1, #AT91_RSTC_CR] @ reset processor
b .
.at91_va_base_sdramc0:
.word AT91_VA_BASE_SYS + AT91_DDRSDRC0

1
arch/arm/mach-at91/generic.h
View File

@ -60,6 +60,7 @@ extern void at91_irq_resume(void);
/* reset */
extern void at91_ioremap_rstc(u32 base_addr);
extern void at91sam9_alt_restart(char, const char *);
extern void at91sam9g45_restart(char, const char *);
/* shutdown */
extern void at91_ioremap_shdwc(u32 base_addr);