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-rw-r--r--arch/metag/kernel/irq.c293
1 files changed, 0 insertions, 293 deletions
diff --git a/arch/metag/kernel/irq.c b/arch/metag/kernel/irq.c
deleted file mode 100644
index 704cf17f8370..000000000000
--- a/arch/metag/kernel/irq.c
+++ /dev/null
@@ -1,293 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Linux/Meta general interrupt handling code
- *
- */
-
-#include <linux/kernel.h>
-#include <linux/interrupt.h>
-#include <linux/init.h>
-#include <linux/irqchip/metag-ext.h>
-#include <linux/irqchip/metag.h>
-#include <linux/irqdomain.h>
-#include <linux/ratelimit.h>
-
-#include <asm/core_reg.h>
-#include <asm/mach/arch.h>
-#include <linux/uaccess.h>
-
-#ifdef CONFIG_4KSTACKS
-union irq_ctx {
- struct thread_info tinfo;
- u32 stack[THREAD_SIZE/sizeof(u32)];
-};
-
-static union irq_ctx *hardirq_ctx[NR_CPUS] __read_mostly;
-static union irq_ctx *softirq_ctx[NR_CPUS] __read_mostly;
-#endif
-
-static struct irq_domain *root_domain;
-
-static unsigned int startup_meta_irq(struct irq_data *data)
-{
- tbi_startup_interrupt(data->hwirq);
- return 0;
-}
-
-static void shutdown_meta_irq(struct irq_data *data)
-{
- tbi_shutdown_interrupt(data->hwirq);
-}
-
-void do_IRQ(int irq, struct pt_regs *regs)
-{
- struct pt_regs *old_regs = set_irq_regs(regs);
-#ifdef CONFIG_4KSTACKS
- struct irq_desc *desc;
- union irq_ctx *curctx, *irqctx;
- u32 *isp;
-#endif
-
- irq_enter();
-
- irq = irq_linear_revmap(root_domain, irq);
-
-#ifdef CONFIG_DEBUG_STACKOVERFLOW
- /* Debugging check for stack overflow: is there less than 1KB free? */
- {
- unsigned long sp;
-
- sp = __core_reg_get(A0StP);
- sp &= THREAD_SIZE - 1;
-
- if (unlikely(sp > (THREAD_SIZE - 1024)))
- pr_err("Stack overflow in do_IRQ: %ld\n", sp);
- }
-#endif
-
-
-#ifdef CONFIG_4KSTACKS
- curctx = (union irq_ctx *) current_thread_info();
- irqctx = hardirq_ctx[smp_processor_id()];
-
- /*
- * this is where we switch to the IRQ stack. However, if we are
- * already using the IRQ stack (because we interrupted a hardirq
- * handler) we can't do that and just have to keep using the
- * current stack (which is the irq stack already after all)
- */
- if (curctx != irqctx) {
- /* build the stack frame on the IRQ stack */
- isp = (u32 *) ((char *)irqctx + sizeof(struct thread_info));
- irqctx->tinfo.task = curctx->tinfo.task;
-
- /*
- * Copy the softirq bits in preempt_count so that the
- * softirq checks work in the hardirq context.
- */
- irqctx->tinfo.preempt_count =
- (irqctx->tinfo.preempt_count & ~SOFTIRQ_MASK) |
- (curctx->tinfo.preempt_count & SOFTIRQ_MASK);
-
- desc = irq_to_desc(irq);
-
- asm volatile (
- "MOV D0.5,%0\n"
- "MOV D1Ar1,%1\n"
- "MOV D1RtP,%2\n"
- "SWAP A0StP,D0.5\n"
- "SWAP PC,D1RtP\n"
- "MOV A0StP,D0.5\n"
- :
- : "r" (isp), "r" (desc), "r" (desc->handle_irq)
- : "memory", "cc", "D1Ar1", "D0Ar2", "D1Ar3", "D0Ar4",
- "D1Ar5", "D0Ar6", "D0Re0", "D1Re0", "D0.4", "D1RtP",
- "D0.5"
- );
- } else
-#endif
- generic_handle_irq(irq);
-
- irq_exit();
-
- set_irq_regs(old_regs);
-}
-
-#ifdef CONFIG_4KSTACKS
-
-static char softirq_stack[NR_CPUS * THREAD_SIZE] __page_aligned_bss;
-
-static char hardirq_stack[NR_CPUS * THREAD_SIZE] __page_aligned_bss;
-
-/*
- * allocate per-cpu stacks for hardirq and for softirq processing
- */
-void irq_ctx_init(int cpu)
-{
- union irq_ctx *irqctx;
-
- if (hardirq_ctx[cpu])
- return;
-
- irqctx = (union irq_ctx *) &hardirq_stack[cpu * THREAD_SIZE];
- irqctx->tinfo.task = NULL;
- irqctx->tinfo.cpu = cpu;
- irqctx->tinfo.preempt_count = HARDIRQ_OFFSET;
- irqctx->tinfo.addr_limit = MAKE_MM_SEG(0);
-
- hardirq_ctx[cpu] = irqctx;
-
- irqctx = (union irq_ctx *) &softirq_stack[cpu * THREAD_SIZE];
- irqctx->tinfo.task = NULL;
- irqctx->tinfo.cpu = cpu;
- irqctx->tinfo.preempt_count = 0;
- irqctx->tinfo.addr_limit = MAKE_MM_SEG(0);
-
- softirq_ctx[cpu] = irqctx;
-
- pr_info("CPU %u irqstacks, hard=%p soft=%p\n",
- cpu, hardirq_ctx[cpu], softirq_ctx[cpu]);
-}
-
-void irq_ctx_exit(int cpu)
-{
- hardirq_ctx[smp_processor_id()] = NULL;
-}
-
-extern asmlinkage void __do_softirq(void);
-
-void do_softirq_own_stack(void)
-{
- struct thread_info *curctx;
- union irq_ctx *irqctx;
- u32 *isp;
-
- curctx = current_thread_info();
- irqctx = softirq_ctx[smp_processor_id()];
- irqctx->tinfo.task = curctx->task;
-
- /* build the stack frame on the softirq stack */
- isp = (u32 *) ((char *)irqctx + sizeof(struct thread_info));
-
- asm volatile (
- "MOV D0.5,%0\n"
- "SWAP A0StP,D0.5\n"
- "CALLR D1RtP,___do_softirq\n"
- "MOV A0StP,D0.5\n"
- :
- : "r" (isp)
- : "memory", "cc", "D1Ar1", "D0Ar2", "D1Ar3", "D0Ar4",
- "D1Ar5", "D0Ar6", "D0Re0", "D1Re0", "D0.4", "D1RtP",
- "D0.5"
- );
-}
-#endif
-
-static struct irq_chip meta_irq_type = {
- .name = "META-IRQ",
- .irq_startup = startup_meta_irq,
- .irq_shutdown = shutdown_meta_irq,
-};
-
-/**
- * tbisig_map() - Map a TBI signal number to a virtual IRQ number.
- * @hw: Number of the TBI signal. Must be in range.
- *
- * Returns: The virtual IRQ number of the TBI signal number IRQ specified by
- * @hw.
- */
-int tbisig_map(unsigned int hw)
-{
- return irq_create_mapping(root_domain, hw);
-}
-
-/**
- * metag_tbisig_map() - map a tbi signal to a Linux virtual IRQ number
- * @d: root irq domain
- * @irq: virtual irq number
- * @hw: hardware irq number (TBI signal number)
- *
- * This sets up a virtual irq for a specified TBI signal number.
- */
-static int metag_tbisig_map(struct irq_domain *d, unsigned int irq,
- irq_hw_number_t hw)
-{
-#ifdef CONFIG_SMP
- irq_set_chip_and_handler(irq, &meta_irq_type, handle_percpu_irq);
-#else
- irq_set_chip_and_handler(irq, &meta_irq_type, handle_simple_irq);
-#endif
- return 0;
-}
-
-static const struct irq_domain_ops metag_tbisig_domain_ops = {
- .map = metag_tbisig_map,
-};
-
-/*
- * void init_IRQ(void)
- *
- * Parameters: None
- *
- * Returns: Nothing
- *
- * This function should be called during kernel startup to initialize
- * the IRQ handling routines.
- */
-void __init init_IRQ(void)
-{
- root_domain = irq_domain_add_linear(NULL, 32,
- &metag_tbisig_domain_ops, NULL);
- if (unlikely(!root_domain))
- panic("init_IRQ: cannot add root IRQ domain");
-
- irq_ctx_init(smp_processor_id());
-
- init_internal_IRQ();
- init_external_IRQ();
-
- if (machine_desc->init_irq)
- machine_desc->init_irq();
-}
-
-int __init arch_probe_nr_irqs(void)
-{
- if (machine_desc->nr_irqs)
- nr_irqs = machine_desc->nr_irqs;
- return 0;
-}
-
-#ifdef CONFIG_HOTPLUG_CPU
-/*
- * The CPU has been marked offline. Migrate IRQs off this CPU. If
- * the affinity settings do not allow other CPUs, force them onto any
- * available CPU.
- */
-void migrate_irqs(void)
-{
- unsigned int i, cpu = smp_processor_id();
-
- for_each_active_irq(i) {
- struct irq_data *data = irq_get_irq_data(i);
- struct cpumask *mask;
- unsigned int newcpu;
-
- if (irqd_is_per_cpu(data))
- continue;
-
- mask = irq_data_get_affinity_mask(data);
- if (!cpumask_test_cpu(cpu, mask))
- continue;
-
- newcpu = cpumask_any_and(mask, cpu_online_mask);
-
- if (newcpu >= nr_cpu_ids) {
- pr_info_ratelimited("IRQ%u no longer affine to CPU%u\n",
- i, cpu);
-
- cpumask_setall(mask);
- }
- irq_set_affinity(i, mask);
- }
-}
-#endif /* CONFIG_HOTPLUG_CPU */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.