* Xianghua Xiao (X.Xiao@motorola.com)
*
* (C) Copyright 2004 Freescale Semiconductor. (MPC86xx Port)
- * Jeff Brown (Jeffrey@freescale.com)
+ * Jeff Brown
* Srikanth Srinivasan (srikanth.srinivasan@freescale.com)
*
* See file CREDITS for list of people who contributed to this
#include <asm/processor.h>
#include <ppc_asm.tmpl>
-unsigned long decrementer_count; /* count value for 1e6/HZ microseconds */
-
-
+unsigned long decrementer_count; /* count value for 1e6/HZ microseconds */
unsigned long timestamp;
-static __inline__ unsigned long get_msr (void)
+
+static __inline__ unsigned long get_msr(void)
{
unsigned long msr;
return msr;
}
-static __inline__ void set_msr (unsigned long msr)
+static __inline__ void set_msr(unsigned long msr)
{
asm volatile ("mtmsr %0"::"r" (msr));
}
-static __inline__ unsigned long get_dec (void)
+static __inline__ unsigned long get_dec(void)
{
unsigned long val;
return val;
}
-
-static __inline__ void set_dec (unsigned long val)
+static __inline__ void set_dec(unsigned long val)
{
if (val)
asm volatile ("mtdec %0"::"r" (val));
}
/* interrupt is not supported yet */
-int interrupt_init_cpu (unsigned *decrementer_count)
+int interrupt_init_cpu(unsigned *decrementer_count)
{
- return 0;
+ return 0;
}
-
-int interrupt_init (void)
+int interrupt_init(void)
{
int ret;
+ /*
+ * The IRQ0 on Rev 2 is pulled high (low in Rev 1.x) to
+ * implement PEX10 errata. As INT is active high, it
+ * will cause core to take 0x500 interrupt.
+ *
+ * Due to the PIC's default pass through mode, as soon
+ * as interrupts are enabled (MSR[EE] = 1), an interrupt
+ * will be taken and u-boot will hang. This is due to a
+ * hardware change (per an errata fix) on new revisions
+ * of the board with Rev 2.x parts.
+ *
+ * Setting the PIC to mixed mode prevents the hang.
+ */
+ if ((get_svr() & 0xf0) == 0x20) {
+ volatile immap_t *immr = (immap_t *)CFG_IMMR;
+ immr->im_pic.gcr = MPC86xx_PICGCR_RST;
+ while (immr->im_pic.gcr & MPC86xx_PICGCR_RST);
+ immr->im_pic.gcr = MPC86xx_PICGCR_MODE;
+ }
+
/* call cpu specific function from $(CPU)/interrupts.c */
- ret = interrupt_init_cpu (&decrementer_count);
+ ret = interrupt_init_cpu(&decrementer_count);
if (ret)
return ret;
- decrementer_count = get_tbclk()/CFG_HZ;
- debug("interrupt init: tbclk() = %d MHz, decrementer_count = %d\n", (get_tbclk()/1000000), decrementer_count);
+ decrementer_count = get_tbclk() / CFG_HZ;
+ debug("interrupt init: tbclk() = %d MHz, decrementer_count = %d\n",
+ (get_tbclk() / 1000000),
+ decrementer_count);
- set_dec (decrementer_count);
+ set_dec(decrementer_count);
- set_msr (get_msr () | MSR_EE);
+ set_msr(get_msr() | MSR_EE);
- debug("MSR = 0x%08lx, Decrementer reg = 0x%08lx\n", get_msr(), get_dec());
+ debug("MSR = 0x%08lx, Decrementer reg = 0x%08lx\n",
+ get_msr(),
+ get_dec());
return 0;
}
-
-void enable_interrupts (void)
+void enable_interrupts(void)
{
- set_msr (get_msr () | MSR_EE);
+ set_msr(get_msr() | MSR_EE);
}
/* returns flag if MSR_EE was set before */
-int disable_interrupts (void)
+int disable_interrupts(void)
{
- ulong msr = get_msr ();
+ ulong msr = get_msr();
- set_msr (msr & ~MSR_EE);
+ set_msr(msr & ~MSR_EE);
return (msr & MSR_EE) != 0;
}
-
void increment_timestamp(void)
{
- timestamp++;
+ timestamp++;
}
/*
* with interrupts disabled.
* Trivial implementation - no need to be really accurate.
*/
-void
-timer_interrupt_cpu (struct pt_regs *regs)
+void timer_interrupt_cpu(struct pt_regs *regs)
{
/* nothing to do here */
}
-
-void timer_interrupt (struct pt_regs *regs)
+void timer_interrupt(struct pt_regs *regs)
{
- /* call cpu specific function from $(CPU)/interrupts.c */
- timer_interrupt_cpu (regs);
+ /* call cpu specific function from $(CPU)/interrupts.c */
+ timer_interrupt_cpu(regs);
- timestamp++;
+ timestamp++;
- ppcDcbf(×tamp);
+ ppcDcbf(×tamp);
- /* Restore Decrementer Count */
- set_dec (decrementer_count);
+ /* Restore Decrementer Count */
+ set_dec(decrementer_count);
#if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG)
if ((timestamp % (CFG_WATCHDOG_FREQ)) == 0)
- WATCHDOG_RESET ();
-#endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */
+ WATCHDOG_RESET();
+#endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */
#ifdef CONFIG_STATUS_LED
- status_led_tick (timestamp);
+ status_led_tick(timestamp);
#endif /* CONFIG_STATUS_LED */
#ifdef CONFIG_SHOW_ACTIVITY
- board_show_activity (timestamp);
+ board_show_activity(timestamp);
#endif /* CONFIG_SHOW_ACTIVITY */
-
}
-void reset_timer (void)
+void reset_timer(void)
{
- timestamp = 0;
+ timestamp = 0;
}
-ulong get_timer (ulong base)
+ulong get_timer(ulong base)
{
- return timestamp - base;
+ return timestamp - base;
}
-void set_timer (ulong t)
+void set_timer(ulong t)
{
- timestamp = t;
+ timestamp = t;
}
/*
* Install and free a interrupt handler. Not implemented yet.
*/
-void
-irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
+void irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
{
}
-void
-irq_free_handler(int vec)
+void irq_free_handler(int vec)
{
}
-
-
-/*******************************************************************************
- *
+/*
* irqinfo - print information about PCI devices,not implemented.
- *
*/
-int
-do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
- printf ("\nInterrupt-unsupported:\n");
+ printf("\nInterrupt-unsupported:\n");
return 0;
}
/*
* Handle external interrupts
*/
-void
-external_interrupt(struct pt_regs *regs)
+void external_interrupt(struct pt_regs *regs)
{
puts("external_interrupt (oops!)\n");
}
-
-
-
-
-
-
projects / oweals / u-boot.git / blobdiff