minix/kernel/arch/earm/bsp/ti/omap_reset.c

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#include <assert.h>
#include <sys/types.h>
#include <machine/cpu.h>
#include <minix/type.h>
#include <minix/board.h>
#include <io.h>
#include "kernel/kernel.h"
#include "kernel/proc.h"
#include "kernel/vm.h"
#include "kernel/proto.h"
#include "arch_proto.h"
#include "bsp_reset.h"
#include "omap_rtc.h"
#define AM335X_CM_BASE 0x44E00000
#define AM335X_CM_SIZE 0x1000
#define AM335X_PRM_DEVICE_OFFSET 0xf00
#define AM335X_PRM_RSTCTRL_REG 0x00
#define AM335X_RST_GLOBAL_WARM_SW_BIT 0
#define DM37XX_CM_BASE 0x48307000
#define DM37XX_CM_SIZE 0x1000
#define DM37XX_PRM_RSTCTRL_REG 0x250
#define DM37XX_RST_DPLL3_BIT 2
struct omap_reset
{
vir_bytes base;
vir_bytes size;
};
static struct omap_reset omap_reset;
static kern_phys_map reset_phys_map;
void
bsp_reset_init(void)
{
if(BOARD_IS_BBXM(machine.board_id)) {
omap_reset.base = DM37XX_CM_BASE;
omap_reset.size = DM37XX_CM_SIZE;
} else if(BOARD_IS_BB(machine.board_id)) {
omap_reset.base = AM335X_CM_BASE;
omap_reset.size = AM335X_CM_SIZE;
}
kern_phys_map_ptr(omap_reset.base, omap_reset.size, &reset_phys_map,
(vir_bytes) &omap_reset.base);
}
void
bsp_reset(void)
{
if(BOARD_IS_BBXM(machine.board_id)) {
mmio_set((omap_reset.base + DM37XX_PRM_RSTCTRL_REG), (1 << DM37XX_RST_DPLL3_BIT));
} else if(BOARD_IS_BB(machine.board_id)) {
mmio_set((omap_reset.base + AM335X_PRM_DEVICE_OFFSET + AM335X_PRM_RSTCTRL_REG), (1 << AM335X_RST_GLOBAL_WARM_SW_BIT));
}
}
void bsp_poweroff(void)
{
/*
* The am335x can signal an external power management chip to cut the power
* by toggling the PMIC_POWER_EN pin. It might fail if there isn't an
* external PMIC or if the PMIC hasn't been configured to respond to toggles.
* The only way to pull the pin low is via ALARM2 (see TRM 20.3.3.8).
* At this point PM should have already signaled readclock to set the alarm.
*/
if (BOARD_IS_BB(machine.board_id)) {
/* rtc was frozen to prevent premature power-off, unfreeze it now */
omap3_rtc_run();
/* wait for the alarm to go off and PMIC to disable power to SoC */
while (1);
}
}