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-rw-r--r--arch/blackfin/kernel/ipipe.c397
1 files changed, 0 insertions, 397 deletions
diff --git a/arch/blackfin/kernel/ipipe.c b/arch/blackfin/kernel/ipipe.c
deleted file mode 100644
index f657b38163e3..000000000000
--- a/arch/blackfin/kernel/ipipe.c
+++ /dev/null
@@ -1,397 +0,0 @@
-/* -*- linux-c -*-
- * linux/arch/blackfin/kernel/ipipe.c
- *
- * Copyright (C) 2005-2007 Philippe Gerum.
- *
- * 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, Inc., 675 Mass Ave, Cambridge MA 02139,
- * USA; 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, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
- * Architecture-dependent I-pipe support for the Blackfin.
- */
-
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/module.h>
-#include <linux/interrupt.h>
-#include <linux/percpu.h>
-#include <linux/bitops.h>
-#include <linux/errno.h>
-#include <linux/kthread.h>
-#include <linux/unistd.h>
-#include <linux/io.h>
-#include <linux/atomic.h>
-#include <asm/irq_handler.h>
-
-DEFINE_PER_CPU(struct pt_regs, __ipipe_tick_regs);
-
-asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs);
-
-static void __ipipe_no_irqtail(void);
-
-unsigned long __ipipe_irq_tail_hook = (unsigned long)&__ipipe_no_irqtail;
-EXPORT_SYMBOL(__ipipe_irq_tail_hook);
-
-unsigned long __ipipe_core_clock;
-EXPORT_SYMBOL(__ipipe_core_clock);
-
-unsigned long __ipipe_freq_scale;
-EXPORT_SYMBOL(__ipipe_freq_scale);
-
-atomic_t __ipipe_irq_lvdepth[IVG15 + 1];
-
-unsigned long __ipipe_irq_lvmask = bfin_no_irqs;
-EXPORT_SYMBOL(__ipipe_irq_lvmask);
-
-static void __ipipe_ack_irq(unsigned irq, struct irq_desc *desc)
-{
- desc->ipipe_ack(irq, desc);
-}
-
-/*
- * __ipipe_enable_pipeline() -- We are running on the boot CPU, hw
- * interrupts are off, and secondary CPUs are still lost in space.
- */
-void __ipipe_enable_pipeline(void)
-{
- unsigned irq;
-
- __ipipe_core_clock = get_cclk(); /* Fetch this once. */
- __ipipe_freq_scale = 1000000000UL / __ipipe_core_clock;
-
- for (irq = 0; irq < NR_IRQS; ++irq)
- ipipe_virtualize_irq(ipipe_root_domain,
- irq,
- (ipipe_irq_handler_t)&asm_do_IRQ,
- NULL,
- &__ipipe_ack_irq,
- IPIPE_HANDLE_MASK | IPIPE_PASS_MASK);
-}
-
-/*
- * __ipipe_handle_irq() -- IPIPE's generic IRQ handler. An optimistic
- * interrupt protection log is maintained here for each domain. Hw
- * interrupts are masked on entry.
- */
-void __ipipe_handle_irq(unsigned irq, struct pt_regs *regs)
-{
- struct ipipe_percpu_domain_data *p = ipipe_root_cpudom_ptr();
- struct ipipe_domain *this_domain, *next_domain;
- struct list_head *head, *pos;
- struct ipipe_irqdesc *idesc;
- int m_ack, s = -1;
-
- /*
- * Software-triggered IRQs do not need any ack. The contents
- * of the register frame should only be used when processing
- * the timer interrupt, but not for handling any other
- * interrupt.
- */
- m_ack = (regs == NULL || irq == IRQ_SYSTMR || irq == IRQ_CORETMR);
- this_domain = __ipipe_current_domain;
- idesc = &this_domain->irqs[irq];
-
- if (unlikely(test_bit(IPIPE_STICKY_FLAG, &idesc->control)))
- head = &this_domain->p_link;
- else {
- head = __ipipe_pipeline.next;
- next_domain = list_entry(head, struct ipipe_domain, p_link);
- idesc = &next_domain->irqs[irq];
- if (likely(test_bit(IPIPE_WIRED_FLAG, &idesc->control))) {
- if (!m_ack && idesc->acknowledge != NULL)
- idesc->acknowledge(irq, irq_to_desc(irq));
- if (test_bit(IPIPE_SYNCDEFER_FLAG, &p->status))
- s = __test_and_set_bit(IPIPE_STALL_FLAG,
- &p->status);
- __ipipe_dispatch_wired(next_domain, irq);
- goto out;
- }
- }
-
- /* Ack the interrupt. */
-
- pos = head;
- while (pos != &__ipipe_pipeline) {
- next_domain = list_entry(pos, struct ipipe_domain, p_link);
- idesc = &next_domain->irqs[irq];
- if (test_bit(IPIPE_HANDLE_FLAG, &idesc->control)) {
- __ipipe_set_irq_pending(next_domain, irq);
- if (!m_ack && idesc->acknowledge != NULL) {
- idesc->acknowledge(irq, irq_to_desc(irq));
- m_ack = 1;
- }
- }
- if (!test_bit(IPIPE_PASS_FLAG, &idesc->control))
- break;
- pos = next_domain->p_link.next;
- }
-
- /*
- * Now walk the pipeline, yielding control to the highest
- * priority domain that has pending interrupt(s) or
- * immediately to the current domain if the interrupt has been
- * marked as 'sticky'. This search does not go beyond the
- * current domain in the pipeline. We also enforce the
- * additional root stage lock (blackfin-specific).
- */
- if (test_bit(IPIPE_SYNCDEFER_FLAG, &p->status))
- s = __test_and_set_bit(IPIPE_STALL_FLAG, &p->status);
-
- /*
- * If the interrupt preempted the head domain, then do not
- * even try to walk the pipeline, unless an interrupt is
- * pending for it.
- */
- if (test_bit(IPIPE_AHEAD_FLAG, &this_domain->flags) &&
- !__ipipe_ipending_p(ipipe_head_cpudom_ptr()))
- goto out;
-
- __ipipe_walk_pipeline(head);
-out:
- if (!s)
- __clear_bit(IPIPE_STALL_FLAG, &p->status);
-}
-
-void __ipipe_enable_irqdesc(struct ipipe_domain *ipd, unsigned irq)
-{
- struct irq_desc *desc = irq_to_desc(irq);
- int prio = __ipipe_get_irq_priority(irq);
-
- desc->depth = 0;
- if (ipd != &ipipe_root &&
- atomic_inc_return(&__ipipe_irq_lvdepth[prio]) == 1)
- __set_bit(prio, &__ipipe_irq_lvmask);
-}
-EXPORT_SYMBOL(__ipipe_enable_irqdesc);
-
-void __ipipe_disable_irqdesc(struct ipipe_domain *ipd, unsigned irq)
-{
- int prio = __ipipe_get_irq_priority(irq);
-
- if (ipd != &ipipe_root &&
- atomic_dec_and_test(&__ipipe_irq_lvdepth[prio]))
- __clear_bit(prio, &__ipipe_irq_lvmask);
-}
-EXPORT_SYMBOL(__ipipe_disable_irqdesc);
-
-asmlinkage int __ipipe_syscall_root(struct pt_regs *regs)
-{
- struct ipipe_percpu_domain_data *p;
- void (*hook)(void);
- int ret;
-
- WARN_ON_ONCE(irqs_disabled_hw());
-
- /*
- * We need to run the IRQ tail hook each time we intercept a
- * syscall, because we know that important operations might be
- * pending there (e.g. Xenomai deferred rescheduling).
- */
- hook = (__typeof__(hook))__ipipe_irq_tail_hook;
- hook();
-
- /*
- * This routine either returns:
- * 0 -- if the syscall is to be passed to Linux;
- * >0 -- if the syscall should not be passed to Linux, and no
- * tail work should be performed;
- * <0 -- if the syscall should not be passed to Linux but the
- * tail work has to be performed (for handling signals etc).
- */
-
- if (!__ipipe_syscall_watched_p(current, regs->orig_p0) ||
- !__ipipe_event_monitored_p(IPIPE_EVENT_SYSCALL))
- return 0;
-
- ret = __ipipe_dispatch_event(IPIPE_EVENT_SYSCALL, regs);
-
- hard_local_irq_disable();
-
- /*
- * This is the end of the syscall path, so we may
- * safely assume a valid Linux task stack here.
- */
- if (current->ipipe_flags & PF_EVTRET) {
- current->ipipe_flags &= ~PF_EVTRET;
- __ipipe_dispatch_event(IPIPE_EVENT_RETURN, regs);
- }
-
- if (!__ipipe_root_domain_p)
- ret = -1;
- else {
- p = ipipe_root_cpudom_ptr();
- if (__ipipe_ipending_p(p))
- __ipipe_sync_pipeline();
- }
-
- hard_local_irq_enable();
-
- return -ret;
-}
-
-static void __ipipe_no_irqtail(void)
-{
-}
-
-int ipipe_get_sysinfo(struct ipipe_sysinfo *info)
-{
- info->sys_nr_cpus = num_online_cpus();
- info->sys_cpu_freq = ipipe_cpu_freq();
- info->sys_hrtimer_irq = IPIPE_TIMER_IRQ;
- info->sys_hrtimer_freq = __ipipe_core_clock;
- info->sys_hrclock_freq = __ipipe_core_clock;
-
- return 0;
-}
-
-/*
- * ipipe_trigger_irq() -- Push the interrupt at front of the pipeline
- * just like if it has been actually received from a hw source. Also
- * works for virtual interrupts.
- */
-int ipipe_trigger_irq(unsigned irq)
-{
- unsigned long flags;
-
-#ifdef CONFIG_IPIPE_DEBUG
- if (irq >= IPIPE_NR_IRQS ||
- (ipipe_virtual_irq_p(irq)
- && !test_bit(irq - IPIPE_VIRQ_BASE, &__ipipe_virtual_irq_map)))
- return -EINVAL;
-#endif
-
- flags = hard_local_irq_save();
- __ipipe_handle_irq(irq, NULL);
- hard_local_irq_restore(flags);
-
- return 1;
-}
-
-asmlinkage void __ipipe_sync_root(void)
-{
- void (*irq_tail_hook)(void) = (void (*)(void))__ipipe_irq_tail_hook;
- struct ipipe_percpu_domain_data *p;
- unsigned long flags;
-
- BUG_ON(irqs_disabled());
-
- flags = hard_local_irq_save();
-
- if (irq_tail_hook)
- irq_tail_hook();
-
- clear_thread_flag(TIF_IRQ_SYNC);
-
- p = ipipe_root_cpudom_ptr();
- if (__ipipe_ipending_p(p))
- __ipipe_sync_pipeline();
-
- hard_local_irq_restore(flags);
-}
-
-void ___ipipe_sync_pipeline(void)
-{
- if (__ipipe_root_domain_p &&
- test_bit(IPIPE_SYNCDEFER_FLAG, &ipipe_root_cpudom_var(status)))
- return;
-
- __ipipe_sync_stage();
-}
-
-void __ipipe_disable_root_irqs_hw(void)
-{
- /*
- * This code is called by the ins{bwl} routines (see
- * arch/blackfin/lib/ins.S), which are heavily used by the
- * network stack. It masks all interrupts but those handled by
- * non-root domains, so that we keep decent network transfer
- * rates for Linux without inducing pathological jitter for
- * the real-time domain.
- */
- bfin_sti(__ipipe_irq_lvmask);
- __set_bit(IPIPE_STALL_FLAG, &ipipe_root_cpudom_var(status));
-}
-
-void __ipipe_enable_root_irqs_hw(void)
-{
- __clear_bit(IPIPE_STALL_FLAG, &ipipe_root_cpudom_var(status));
- bfin_sti(bfin_irq_flags);
-}
-
-/*
- * We could use standard atomic bitops in the following root status
- * manipulation routines, but let's prepare for SMP support in the
- * same move, preventing CPU migration as required.
- */
-void __ipipe_stall_root(void)
-{
- unsigned long *p, flags;
-
- flags = hard_local_irq_save();
- p = &__ipipe_root_status;
- __set_bit(IPIPE_STALL_FLAG, p);
- hard_local_irq_restore(flags);
-}
-EXPORT_SYMBOL(__ipipe_stall_root);
-
-unsigned long __ipipe_test_and_stall_root(void)
-{
- unsigned long *p, flags;
- int x;
-
- flags = hard_local_irq_save();
- p = &__ipipe_root_status;
- x = __test_and_set_bit(IPIPE_STALL_FLAG, p);
- hard_local_irq_restore(flags);
-
- return x;
-}
-EXPORT_SYMBOL(__ipipe_test_and_stall_root);
-
-unsigned long __ipipe_test_root(void)
-{
- const unsigned long *p;
- unsigned long flags;
- int x;
-
- flags = hard_local_irq_save_smp();
- p = &__ipipe_root_status;
- x = test_bit(IPIPE_STALL_FLAG, p);
- hard_local_irq_restore_smp(flags);
-
- return x;
-}
-EXPORT_SYMBOL(__ipipe_test_root);
-
-void __ipipe_lock_root(void)
-{
- unsigned long *p, flags;
-
- flags = hard_local_irq_save();
- p = &__ipipe_root_status;
- __set_bit(IPIPE_SYNCDEFER_FLAG, p);
- hard_local_irq_restore(flags);
-}
-EXPORT_SYMBOL(__ipipe_lock_root);
-
-void __ipipe_unlock_root(void)
-{
- unsigned long *p, flags;
-
- flags = hard_local_irq_save();
- p = &__ipipe_root_status;
- __clear_bit(IPIPE_SYNCDEFER_FLAG, p);
- hard_local_irq_restore(flags);
-}
-EXPORT_SYMBOL(__ipipe_unlock_root);