diff options
Diffstat (limited to 'u-boot/arch/powerpc/cpu/mpc5xx/interrupts.c')
| -rw-r--r-- | u-boot/arch/powerpc/cpu/mpc5xx/interrupts.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/u-boot/arch/powerpc/cpu/mpc5xx/interrupts.c b/u-boot/arch/powerpc/cpu/mpc5xx/interrupts.c new file mode 100644 index 0000000..66bce30 --- /dev/null +++ b/u-boot/arch/powerpc/cpu/mpc5xx/interrupts.c @@ -0,0 +1,207 @@ +/* + * (C) Copyright 2000-2002 Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * (C) Copyright 2003 Martin Winistoerfer, martinwinistoerfer@gmx.ch. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, + */ + +/* + * File: interrupt.c + * + * Discription: Contains interrupt routines needed by U-Boot + * + */ + +#include <common.h> +#include <command.h> +#include <mpc5xx.h> +#include <asm/processor.h> + +#if defined(CONFIG_PATI) +/* PATI uses IRQs for PCI doorbell */ +#undef NR_IRQS +#define NR_IRQS 16 +#endif + +struct interrupt_action { + interrupt_handler_t *handler; + void *arg; + int count; +}; + +static struct interrupt_action irq_vecs[NR_IRQS]; + +/* + * Initialise interrupts + */ + +int interrupt_init_cpu (ulong *decrementer_count) +{ + volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR; + int vec; + + /* Decrementer used here for status led */ + *decrementer_count = get_tbclk () / CONFIG_SYS_HZ; + + /* Disable all interrupts */ + immr->im_siu_conf.sc_simask = 0; + for (vec=0; vec<NR_IRQS; vec++) { + irq_vecs[vec].handler = NULL; + irq_vecs[vec].arg = NULL; + irq_vecs[vec].count = 0; + } + + return (0); +} + +/* + * Handle external interrupts + */ +void external_interrupt (struct pt_regs *regs) +{ + volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR; + int irq; + ulong simask, newmask; + ulong vec, v_bit; + + /* + * read the SIVEC register and shift the bits down + * to get the irq number + */ + vec = immr->im_siu_conf.sc_sivec; + irq = vec >> 26; + v_bit = 0x80000000UL >> irq; + + /* + * Read Interrupt Mask Register and Mask Interrupts + */ + simask = immr->im_siu_conf.sc_simask; + newmask = simask & (~(0xFFFF0000 >> irq)); + immr->im_siu_conf.sc_simask = newmask; + + if (!(irq & 0x1)) { /* External Interrupt ? */ + ulong siel; + + /* + * Read Interrupt Edge/Level Register + */ + siel = immr->im_siu_conf.sc_siel; + + if (siel & v_bit) { /* edge triggered interrupt ? */ + /* + * Rewrite SIPEND Register to clear interrupt + */ + immr->im_siu_conf.sc_sipend = v_bit; + } + } + + if (irq_vecs[irq].handler != NULL) { + irq_vecs[irq].handler (irq_vecs[irq].arg); + } else { + printf ("\nBogus External Interrupt IRQ %d Vector %ld\n", + irq, vec); + /* turn off the bogus interrupt to avoid it from now */ + simask &= ~v_bit; + } + /* + * Re-Enable old Interrupt Mask + */ + immr->im_siu_conf.sc_simask = simask; +} + +/* + * Install and free an interrupt handler + */ +void irq_install_handler (int vec, interrupt_handler_t * handler, + void *arg) +{ + volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR; + /* SIU interrupt */ + if (irq_vecs[vec].handler != NULL) { + printf ("SIU interrupt %d 0x%x\n", + vec, + (uint) handler); + } + irq_vecs[vec].handler = handler; + irq_vecs[vec].arg = arg; + immr->im_siu_conf.sc_simask |= 1 << (31 - vec); +#if 0 + printf ("Install SIU interrupt for vector %d ==> %p\n", + vec, handler); +#endif +} + +void irq_free_handler (int vec) +{ + volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR; + /* SIU interrupt */ +#if 0 + printf ("Free CPM interrupt for vector %d\n", + vec); +#endif + immr->im_siu_conf.sc_simask &= ~(1 << (31 - vec)); + irq_vecs[vec].handler = NULL; + irq_vecs[vec].arg = NULL; +} + +/* + * Timer interrupt - gets called when bit 0 of DEC changes from + * 0. Decrementer is enabled with bit TBE in TBSCR. + */ +void timer_interrupt_cpu (struct pt_regs *regs) +{ + volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR; + +#if 0 + printf ("*** Timer Interrupt *** "); +#endif + /* Reset Timer Status Bit and Timers Interrupt Status */ + immr->im_clkrstk.cark_plprcrk = KAPWR_KEY; + __asm__ ("nop"); + immr->im_clkrst.car_plprcr |= PLPRCR_TEXPS | PLPRCR_TMIST; + + return; +} + +#if defined(CONFIG_CMD_IRQ) +/******************************************************************************* + * + * irqinfo - print information about IRQs + * + */ +int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + int vec; + + printf ("\nInterrupt-Information:\n"); + printf ("Nr Routine Arg Count\n"); + + for (vec=0; vec<NR_IRQS; vec++) { + if (irq_vecs[vec].handler != NULL) { + printf ("%02d %08lx %08lx %d\n", + vec, + (ulong)irq_vecs[vec].handler, + (ulong)irq_vecs[vec].arg, + irq_vecs[vec].count); + } + } + return 0; +} + + +#endif |