diff options
Diffstat (limited to 'arch/cris/arch-v10/kernel/irq.c')
| -rw-r--r-- | arch/cris/arch-v10/kernel/irq.c | 236 |
1 files changed, 0 insertions, 236 deletions
diff --git a/arch/cris/arch-v10/kernel/irq.c b/arch/cris/arch-v10/kernel/irq.c deleted file mode 100644 index df11e383acdd..000000000000 --- a/arch/cris/arch-v10/kernel/irq.c +++ /dev/null @@ -1,236 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * linux/arch/cris/kernel/irq.c - * - * Copyright (c) 2000-2002 Axis Communications AB - * - * Authors: Bjorn Wesen (bjornw@axis.com) - * - * This file contains the interrupt vectors and some - * helper functions - * - */ - -#include <asm/irq.h> -#include <asm/current.h> -#include <linux/irq.h> -#include <linux/interrupt.h> -#include <linux/kernel.h> -#include <linux/init.h> - -#define crisv10_mask_irq(irq_nr) (*R_VECT_MASK_CLR = 1 << (irq_nr)); -#define crisv10_unmask_irq(irq_nr) (*R_VECT_MASK_SET = 1 << (irq_nr)); - -extern void kgdb_init(void); -extern void breakpoint(void); - -/* don't use set_int_vector, it bypasses the linux interrupt handlers. it is - * global just so that the kernel gdb can use it. - */ - -void -set_int_vector(int n, irqvectptr addr) -{ - etrax_irv->v[n + 0x20] = (irqvectptr)addr; -} - -/* the breakpoint vector is obviously not made just like the normal irq handlers - * but needs to contain _code_ to jump to addr. - * - * the BREAK n instruction jumps to IBR + n * 8 - */ - -void -set_break_vector(int n, irqvectptr addr) -{ - unsigned short *jinstr = (unsigned short *)&etrax_irv->v[n*2]; - unsigned long *jaddr = (unsigned long *)(jinstr + 1); - - /* if you don't know what this does, do not touch it! */ - - *jinstr = 0x0d3f; - *jaddr = (unsigned long)addr; - - /* 00000026 <clrlop+1a> 3f0d82000000 jump 0x82 */ -} - -/* - * This builds up the IRQ handler stubs using some ugly macros in irq.h - * - * These macros create the low-level assembly IRQ routines that do all - * the operations that are needed. They are also written to be fast - and to - * disable interrupts as little as humanly possible. - * - */ - -/* IRQ0 and 1 are special traps */ -void hwbreakpoint(void); -void IRQ1_interrupt(void); -BUILD_TIMER_IRQ(2, 0x04) /* the timer interrupt is somewhat special */ -BUILD_IRQ(3, 0x08) -BUILD_IRQ(4, 0x10) -BUILD_IRQ(5, 0x20) -BUILD_IRQ(6, 0x40) -BUILD_IRQ(7, 0x80) -BUILD_IRQ(8, 0x100) -BUILD_IRQ(9, 0x200) -BUILD_IRQ(10, 0x400) -BUILD_IRQ(11, 0x800) -BUILD_IRQ(12, 0x1000) -BUILD_IRQ(13, 0x2000) -void mmu_bus_fault(void); /* IRQ 14 is the bus fault interrupt */ -void multiple_interrupt(void); /* IRQ 15 is the multiple IRQ interrupt */ -BUILD_IRQ(16, 0x10000 | 0x20000) /* ethernet tx interrupt needs to block rx */ -BUILD_IRQ(17, 0x20000 | 0x10000) /* ...and vice versa */ -BUILD_IRQ(18, 0x40000) -BUILD_IRQ(19, 0x80000) -BUILD_IRQ(20, 0x100000) -BUILD_IRQ(21, 0x200000) -BUILD_IRQ(22, 0x400000) -BUILD_IRQ(23, 0x800000) -BUILD_IRQ(24, 0x1000000) -BUILD_IRQ(25, 0x2000000) -/* IRQ 26-30 are reserved */ -BUILD_IRQ(31, 0x80000000) - -/* - * Pointers to the low-level handlers - */ - -static void (*interrupt[NR_IRQS])(void) = { - NULL, NULL, IRQ2_interrupt, IRQ3_interrupt, - IRQ4_interrupt, IRQ5_interrupt, IRQ6_interrupt, IRQ7_interrupt, - IRQ8_interrupt, IRQ9_interrupt, IRQ10_interrupt, IRQ11_interrupt, - IRQ12_interrupt, IRQ13_interrupt, NULL, NULL, - IRQ16_interrupt, IRQ17_interrupt, IRQ18_interrupt, IRQ19_interrupt, - IRQ20_interrupt, IRQ21_interrupt, IRQ22_interrupt, IRQ23_interrupt, - IRQ24_interrupt, IRQ25_interrupt, NULL, NULL, NULL, NULL, NULL, - IRQ31_interrupt -}; - -static void enable_crisv10_irq(struct irq_data *data) -{ - crisv10_unmask_irq(data->irq); -} - -static void disable_crisv10_irq(struct irq_data *data) -{ - crisv10_mask_irq(data->irq); -} - -static struct irq_chip crisv10_irq_type = { - .name = "CRISv10", - .irq_shutdown = disable_crisv10_irq, - .irq_enable = enable_crisv10_irq, - .irq_disable = disable_crisv10_irq, -}; - -void weird_irq(void); -void system_call(void); /* from entry.S */ -void do_sigtrap(void); /* from entry.S */ -void gdb_handle_breakpoint(void); /* from entry.S */ - -extern void do_IRQ(int irq, struct pt_regs * regs); - -/* Handle multiple IRQs */ -void do_multiple_IRQ(struct pt_regs* regs) -{ - int bit; - unsigned masked; - unsigned mask; - unsigned ethmask = 0; - - /* Get interrupts to mask and handle */ - mask = masked = *R_VECT_MASK_RD; - - /* Never mask timer IRQ */ - mask &= ~(IO_MASK(R_VECT_MASK_RD, timer0)); - - /* - * If either ethernet interrupt (rx or tx) is active then block - * the other one too. Unblock afterwards also. - */ - if (mask & - (IO_STATE(R_VECT_MASK_RD, dma0, active) | - IO_STATE(R_VECT_MASK_RD, dma1, active))) { - ethmask = (IO_MASK(R_VECT_MASK_RD, dma0) | - IO_MASK(R_VECT_MASK_RD, dma1)); - } - - /* Block them */ - *R_VECT_MASK_CLR = (mask | ethmask); - - /* An extra irq_enter here to prevent softIRQs to run after - * each do_IRQ. This will decrease the interrupt latency. - */ - irq_enter(); - - /* Handle all IRQs */ - for (bit = 2; bit < 32; bit++) { - if (masked & (1 << bit)) { - do_IRQ(bit, regs); - } - } - - /* This irq_exit() will trigger the soft IRQs. */ - irq_exit(); - - /* Unblock the IRQs again */ - *R_VECT_MASK_SET = (masked | ethmask); -} - -/* init_IRQ() is called by start_kernel and is responsible for fixing IRQ masks and - setting the irq vector table. -*/ - -void __init init_IRQ(void) -{ - int i; - - /* clear all interrupt masks */ - *R_IRQ_MASK0_CLR = 0xffffffff; - *R_IRQ_MASK1_CLR = 0xffffffff; - *R_IRQ_MASK2_CLR = 0xffffffff; - *R_VECT_MASK_CLR = 0xffffffff; - - for (i = 0; i < 256; i++) - etrax_irv->v[i] = weird_irq; - - /* Initialize IRQ handler descriptors. */ - for(i = 2; i < NR_IRQS; i++) { - irq_set_chip_and_handler(i, &crisv10_irq_type, - handle_simple_irq); - set_int_vector(i, interrupt[i]); - } - - /* the entries in the break vector contain actual code to be - executed by the associated break handler, rather than just a jump - address. therefore we need to setup a default breakpoint handler - for all breakpoints */ - for (i = 0; i < 16; i++) - set_break_vector(i, do_sigtrap); - - /* except IRQ 15 which is the multiple-IRQ handler on Etrax100 */ - set_int_vector(15, multiple_interrupt); - - /* 0 and 1 which are special breakpoint/NMI traps */ - set_int_vector(0, hwbreakpoint); - set_int_vector(1, IRQ1_interrupt); - - /* and irq 14 which is the mmu bus fault handler */ - set_int_vector(14, mmu_bus_fault); - - /* setup the system-call trap, which is reached by BREAK 13 */ - set_break_vector(13, system_call); - - /* setup a breakpoint handler for debugging used for both user and - kernel mode debugging (which is why it is not inside an ifdef - CONFIG_ETRAX_KGDB) */ - set_break_vector(8, gdb_handle_breakpoint); - -#ifdef CONFIG_ETRAX_KGDB - /* setup kgdb if its enabled, and break into the debugger */ - kgdb_init(); - breakpoint(); -#endif -} |