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ARM: OMAP: Allow platforms to hook reset cleanly

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This adds a clean method to allow platforms to hook into the reset
code if they require to.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Russell King - ARM Linux 2011-01-27 16:39:45 -08:00 committed by Tony Lindgren
parent 277a28567f
commit ee54dba9c3
6 changed files with 91 additions and 86 deletions
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2
arch/arm/mach-omap1/Makefile
View File

@ -4,7 +4,7 @@
# Common support
obj-y := io.o id.o sram.o time.o irq.o mux.o flash.o serial.o devices.o dma.o
obj-y += clock.o clock_data.o opp_data.o
obj-y += clock.o clock_data.o opp_data.o reset.o
obj-$(CONFIG_OMAP_MCBSP) += mcbsp.o

106
arch/arm/mach-omap1/board-voiceblue.c
View File

@ -26,6 +26,7 @@
#include <linux/smc91x.h>
#include <mach/hardware.h>
#include <mach/system.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
@ -163,52 +164,6 @@ static void __init voiceblue_init_irq(void)
omap_init_irq();
}
static void __init voiceblue_init(void)
{
/* mux pins for uarts */
omap_cfg_reg(UART1_TX);
omap_cfg_reg(UART1_RTS);
omap_cfg_reg(UART2_TX);
omap_cfg_reg(UART2_RTS);
omap_cfg_reg(UART3_TX);
omap_cfg_reg(UART3_RX);
/* Watchdog */
gpio_request(0, "Watchdog");
/* smc91x reset */
gpio_request(7, "SMC91x reset");
gpio_direction_output(7, 1);
udelay(2); /* wait at least 100ns */
gpio_set_value(7, 0);
mdelay(50); /* 50ms until PHY ready */
/* smc91x interrupt pin */
gpio_request(8, "SMC91x irq");
/* 16C554 reset*/
gpio_request(6, "16C554 reset");
gpio_direction_output(6, 0);
/* 16C554 interrupt pins */
gpio_request(12, "16C554 irq");
gpio_request(13, "16C554 irq");
gpio_request(14, "16C554 irq");
gpio_request(15, "16C554 irq");
set_irq_type(gpio_to_irq(12), IRQ_TYPE_EDGE_RISING);
set_irq_type(gpio_to_irq(13), IRQ_TYPE_EDGE_RISING);
set_irq_type(gpio_to_irq(14), IRQ_TYPE_EDGE_RISING);
set_irq_type(gpio_to_irq(15), IRQ_TYPE_EDGE_RISING);
platform_add_devices(voiceblue_devices, ARRAY_SIZE(voiceblue_devices));
omap_board_config = voiceblue_config;
omap_board_config_size = ARRAY_SIZE(voiceblue_config);
omap_serial_init();
omap1_usb_init(&voiceblue_usb_config);
omap_register_i2c_bus(1, 100, NULL, 0);
/* There is a good chance board is going up, so enable power LED
* (it is connected through invertor) */
omap_writeb(0x00, OMAP_LPG1_LCR);
omap_writeb(0x00, OMAP_LPG1_PMR); /* Disable clock */
}
static void __init voiceblue_map_io(void)
{
omap1_map_common_io();
@ -275,8 +230,17 @@ void voiceblue_wdt_ping(void)
gpio_set_value(0, wdt_gpio_state);
}
void voiceblue_reset(void)
static void voiceblue_reset(char mode, const char *cmd)
{
/*
* Workaround for 5912/1611b bug mentioned in sprz209d.pdf p. 28
* "Global Software Reset Affects Traffic Controller Frequency".
*/
if (cpu_is_omap5912()) {
omap_writew(omap_readw(DPLL_CTL) & ~(1 << 4), DPLL_CTL);
omap_writew(0x8, ARM_RSTCT1);
}
set_bit(MACHINE_REBOOT, &machine_state);
voiceblue_wdt_enable();
while (1) ;
@ -286,6 +250,54 @@ EXPORT_SYMBOL(voiceblue_wdt_enable);
EXPORT_SYMBOL(voiceblue_wdt_disable);
EXPORT_SYMBOL(voiceblue_wdt_ping);
static void __init voiceblue_init(void)
{
/* mux pins for uarts */
omap_cfg_reg(UART1_TX);
omap_cfg_reg(UART1_RTS);
omap_cfg_reg(UART2_TX);
omap_cfg_reg(UART2_RTS);
omap_cfg_reg(UART3_TX);
omap_cfg_reg(UART3_RX);
/* Watchdog */
gpio_request(0, "Watchdog");
/* smc91x reset */
gpio_request(7, "SMC91x reset");
gpio_direction_output(7, 1);
udelay(2); /* wait at least 100ns */
gpio_set_value(7, 0);
mdelay(50); /* 50ms until PHY ready */
/* smc91x interrupt pin */
gpio_request(8, "SMC91x irq");
/* 16C554 reset*/
gpio_request(6, "16C554 reset");
gpio_direction_output(6, 0);
/* 16C554 interrupt pins */
gpio_request(12, "16C554 irq");
gpio_request(13, "16C554 irq");
gpio_request(14, "16C554 irq");
gpio_request(15, "16C554 irq");
set_irq_type(gpio_to_irq(12), IRQ_TYPE_EDGE_RISING);
set_irq_type(gpio_to_irq(13), IRQ_TYPE_EDGE_RISING);
set_irq_type(gpio_to_irq(14), IRQ_TYPE_EDGE_RISING);
set_irq_type(gpio_to_irq(15), IRQ_TYPE_EDGE_RISING);
platform_add_devices(voiceblue_devices, ARRAY_SIZE(voiceblue_devices));
omap_board_config = voiceblue_config;
omap_board_config_size = ARRAY_SIZE(voiceblue_config);
omap_serial_init();
omap1_usb_init(&voiceblue_usb_config);
omap_register_i2c_bus(1, 100, NULL, 0);
/* There is a good chance board is going up, so enable power LED
* (it is connected through invertor) */
omap_writeb(0x00, OMAP_LPG1_LCR);
omap_writeb(0x00, OMAP_LPG1_PMR); /* Disable clock */
arch_reset = voiceblue_reset;
}
MACHINE_START(VOICEBLUE, "VoiceBlue OMAP5910")
/* Maintainer: Ladislav Michl <michl@2n.cz> */
.boot_params = 0x10000100,

25
arch/arm/mach-omap1/reset.c Normal file
View File

@ -0,0 +1,25 @@
/*
* OMAP1 reset support
*/
#include <linux/kernel.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <mach/system.h>
#include <plat/prcm.h>
void omap1_arch_reset(char mode, const char *cmd)
{
/*
* Workaround for 5912/1611b bug mentioned in sprz209d.pdf p. 28
* "Global Software Reset Affects Traffic Controller Frequency".
*/
if (cpu_is_omap5912()) {
omap_writew(omap_readw(DPLL_CTL) & ~(1 << 4), DPLL_CTL);
omap_writew(0x8, ARM_RSTCT1);
}
omap_writew(1, ARM_RSTCT1);
}
void (*arch_reset)(char, const char *) = omap1_arch_reset;

5
arch/arm/mach-omap2/prcm.c
View File

@ -24,6 +24,7 @@
#include <linux/io.h>
#include <linux/delay.h>
#include <mach/system.h>
#include <plat/common.h>
#include <plat/prcm.h>
#include <plat/irqs.h>
@ -57,7 +58,7 @@ u32 omap_prcm_get_reset_sources(void)
EXPORT_SYMBOL(omap_prcm_get_reset_sources);
/* Resets clock rates and reboots the system. Only called from system.h */
void omap_prcm_arch_reset(char mode, const char *cmd)
static void omap_prcm_arch_reset(char mode, const char *cmd)
{
s16 prcm_offs = 0;
@ -108,6 +109,8 @@ void omap_prcm_arch_reset(char mode, const char *cmd)
omap2_prm_read_mod_reg(prcm_offs, OMAP2_RM_RSTCTRL); /* OCP barrier */
}
void (*arch_reset)(char, const char *) = omap_prcm_arch_reset;
/**
* omap2_cm_wait_idlest - wait for IDLEST bit to indicate module readiness
* @reg: physical address of module IDLEST register

1
arch/arm/plat-omap/include/plat/prcm.h
View File

@ -28,7 +28,6 @@
#define __ASM_ARM_ARCH_OMAP_PRCM_H
u32 omap_prcm_get_reset_sources(void);
void omap_prcm_arch_reset(char mode, const char *cmd);
int omap2_cm_wait_idlest(void __iomem *reg, u32 mask, u8 idlest,
const char *name);

38
arch/arm/plat-omap/include/plat/system.h
View File

@ -4,48 +4,14 @@
*/
#ifndef __ASM_ARCH_SYSTEM_H
#define __ASM_ARCH_SYSTEM_H
#include <linux/clk.h>
#include <asm/mach-types.h>
#include <mach/hardware.h>
#include <plat/prcm.h>
#ifndef CONFIG_MACH_VOICEBLUE
#define voiceblue_reset() do {} while (0)
#else
extern void voiceblue_reset(void);
#endif
#include <asm/proc-fns.h>
static inline void arch_idle(void)
{
cpu_do_idle();
}
static inline void omap1_arch_reset(char mode, const char *cmd)
{
/*
* Workaround for 5912/1611b bug mentioned in sprz209d.pdf p. 28
* "Global Software Reset Affects Traffic Controller Frequency".
*/
if (cpu_is_omap5912()) {
omap_writew(omap_readw(DPLL_CTL) & ~(1 << 4),
DPLL_CTL);
omap_writew(0x8, ARM_RSTCT1);
}
if (machine_is_voiceblue())
voiceblue_reset();
else
omap_writew(1, ARM_RSTCT1);
}
static inline void arch_reset(char mode, const char *cmd)
{
if (!cpu_class_is_omap2())
omap1_arch_reset(mode, cmd);
else
omap_prcm_arch_reset(mode, cmd);
}
extern void (*arch_reset)(char, const char *);
#endif