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/*
* Find and initialize irqmp and gptimer.
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <bsp.h>
#include <bsp/fatal.h>
#include <amba.h>
rtems_interrupt_lock GRLIB_IrqCtrl_Lock =
RTEMS_INTERRUPT_LOCK_INITIALIZER("GRLIB IrqCtrl");
/* Pointers to Interrupt Controller configuration registers */
volatile struct irqmp_regs *GRLIB_IrqCtrl_Regs;
struct ambapp_dev *GRLIB_IrqCtrl_Adev;
/* GRLIB extended IRQ controller IRQ number */
int GRLIB_IrqCtrl_EIrq = -1;
/* Initialize Extended Interrupt controller */
static void grlib_ext_irq_init(void)
{
if ( (GRLIB_IrqCtrl_Regs->mpstat >> 16) & 0xf ) {
/* Extended IRQ controller available */
GRLIB_IrqCtrl_EIrq = (GRLIB_IrqCtrl_Regs->mpstat >> 16) & 0xf;
}
}
/*
* irqmp_initialize
*
* Probes for IRQMP and initialises necessary registers.
*
*/
void irqmp_initialize(void)
{
int icsel;
struct ambapp_dev *adev;
/* Find GRLIB Interrupt controller */
adev = (void *)ambapp_for_each(&ambapp_plb, (OPTIONS_ALL|OPTIONS_APB_SLVS),
VENDOR_GAISLER, GAISLER_IRQMP,
ambapp_find_by_idx, NULL);
if (adev != NULL) {
GRLIB_IrqCtrl_Regs = (volatile struct irqmp_regs *)DEV_TO_APB(adev)->start;
GRLIB_IrqCtrl_Adev = adev;
if ((GRLIB_IrqCtrl_Regs->ampctrl >> 28) > 0) {
/* IRQ Controller has support for multiple IRQ Controllers, each
* CPU can be routed to different Controllers, we find out which
* controller by looking at the IRQCTRL Select Register for this CPU.
* Each Controller is located at a 4KByte offset.
*/
icsel = GRLIB_IrqCtrl_Regs->icsel[GRLIB_Cpu_Index/8];
icsel = (icsel >> ((7 - (GRLIB_Cpu_Index & 0x7)) * 4)) & 0xf;
GRLIB_IrqCtrl_Regs += icsel;
}
GRLIB_IrqCtrl_Regs->mask[GRLIB_Cpu_Index] = 0;
GRLIB_IrqCtrl_Regs->force[GRLIB_Cpu_Index] = 0;
GRLIB_IrqCtrl_Regs->iclear = 0xffffffff;
/* Init Extended IRQ controller if available */
grlib_ext_irq_init();
}
}
/* GPTIMER */
unsigned int grlib_timer_prescaler __attribute__((weak)) = 0;
int grlib_timer_core_index __attribute__((weak)) = 0;
volatile struct gptimer_regs *GRLIB_Timer_Regs;
struct ambapp_dev *GRLIB_Timer_Adev;
/*
* gptimer_initialize
*
*/
void gptimer_initialize(void)
{
struct ambapp_dev *adev;
/* find GP Timer */
adev = (void *)ambapp_for_each(&ambapp_plb, (OPTIONS_ALL|OPTIONS_APB_SLVS),
VENDOR_GAISLER, GAISLER_GPTIMER,
ambapp_find_by_idx, &grlib_timer_core_index);
if (adev) {
GRLIB_Timer_Regs = (volatile struct gptimer_regs *)DEV_TO_APB(adev)->start;
GRLIB_Timer_Adev = adev;
/* Register AMBA Bus Frequency */
ambapp_freq_init(
&ambapp_plb,
GRLIB_Timer_Adev,
(GRLIB_Timer_Regs->scaler_reload + 1)
* GRLIB_GPTIMER_0_FREQUENCY_SET_BY_BOOT_LOADER
);
/* Set user prescaler configuration. Use this to increase accuracy of timer
* and accociated services like cpucounter.
* Note that minimum value is the number of timer instances present in
* GRTIMER/GPTIMER hardware. See HW manual.
*/
if (grlib_timer_prescaler)
GRLIB_Timer_Regs->scaler_reload = grlib_timer_prescaler;
}
}
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