aboutsummaryrefslogtreecommitdiff
path: root/arch/blackfin/kernel
diff options
context:
space:
mode:
Diffstat (limited to 'arch/blackfin/kernel')
-rw-r--r--arch/blackfin/kernel/Makefile8
-rw-r--r--arch/blackfin/kernel/cplb-nompu/cplbinit.c4
-rw-r--r--arch/blackfin/kernel/ipipe.c176
-rw-r--r--arch/blackfin/kernel/irqchip.c14
-rw-r--r--arch/blackfin/kernel/kgdb_test.c9
-rw-r--r--arch/blackfin/kernel/ptrace.c5
-rw-r--r--arch/blackfin/kernel/setup.c10
-rw-r--r--arch/blackfin/kernel/time.c5
8 files changed, 85 insertions, 146 deletions
diff --git a/arch/blackfin/kernel/Makefile b/arch/blackfin/kernel/Makefile
index 4a92a86824b..fd4d4328a0f 100644
--- a/arch/blackfin/kernel/Makefile
+++ b/arch/blackfin/kernel/Makefile
@@ -15,13 +15,15 @@ else
obj-y += time.o
endif
-CFLAGS_kgdb_test.o := -mlong-calls -O0
-
obj-$(CONFIG_IPIPE) += ipipe.o
obj-$(CONFIG_IPIPE_TRACE_MCOUNT) += mcount.o
obj-$(CONFIG_BFIN_GPTIMERS) += gptimers.o
obj-$(CONFIG_CPLB_INFO) += cplbinfo.o
obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_KGDB) += kgdb.o
-obj-$(CONFIG_KGDB_TESTCASE) += kgdb_test.o
+obj-$(CONFIG_KGDB_TESTS) += kgdb_test.o
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
+
+# the kgdb test puts code into L2 and without linker
+# relaxation, we need to force long calls to/from it
+CFLAGS_kgdb_test.o := -mlong-calls -O0
diff --git a/arch/blackfin/kernel/cplb-nompu/cplbinit.c b/arch/blackfin/kernel/cplb-nompu/cplbinit.c
index 0e28f759573..d6c067782e6 100644
--- a/arch/blackfin/kernel/cplb-nompu/cplbinit.c
+++ b/arch/blackfin/kernel/cplb-nompu/cplbinit.c
@@ -53,9 +53,13 @@ void __init generate_cplb_tables_cpu(unsigned int cpu)
i_d = i_i = 0;
+#ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
/* Set up the zero page. */
d_tbl[i_d].addr = 0;
d_tbl[i_d++].data = SDRAM_OOPS | PAGE_SIZE_1KB;
+ i_tbl[i_i].addr = 0;
+ i_tbl[i_i++].data = SDRAM_OOPS | PAGE_SIZE_1KB;
+#endif
/* Cover kernel memory with 4M pages. */
addr = 0;
diff --git a/arch/blackfin/kernel/ipipe.c b/arch/blackfin/kernel/ipipe.c
index 339be5a3ae6..a5de8d45424 100644
--- a/arch/blackfin/kernel/ipipe.c
+++ b/arch/blackfin/kernel/ipipe.c
@@ -35,14 +35,8 @@
#include <asm/atomic.h>
#include <asm/io.h>
-static int create_irq_threads;
-
DEFINE_PER_CPU(struct pt_regs, __ipipe_tick_regs);
-static DEFINE_PER_CPU(unsigned long, pending_irqthread_mask);
-
-static DEFINE_PER_CPU(int [IVG13 + 1], pending_irq_count);
-
asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs);
static void __ipipe_no_irqtail(void);
@@ -93,6 +87,7 @@ void __ipipe_enable_pipeline(void)
*/
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;
int m_ack, s = -1;
@@ -104,7 +99,6 @@ void __ipipe_handle_irq(unsigned irq, struct pt_regs *regs)
* interrupt.
*/
m_ack = (regs == NULL || irq == IRQ_SYSTMR || irq == IRQ_CORETMR);
-
this_domain = ipipe_current_domain;
if (unlikely(test_bit(IPIPE_STICKY_FLAG, &this_domain->irqs[irq].control)))
@@ -114,49 +108,28 @@ void __ipipe_handle_irq(unsigned irq, struct pt_regs *regs)
next_domain = list_entry(head, struct ipipe_domain, p_link);
if (likely(test_bit(IPIPE_WIRED_FLAG, &next_domain->irqs[irq].control))) {
if (!m_ack && next_domain->irqs[irq].acknowledge != NULL)
- next_domain->irqs[irq].acknowledge(irq, irq_desc + irq);
- if (test_bit(IPIPE_ROOTLOCK_FLAG, &ipipe_root_domain->flags))
- s = __test_and_set_bit(IPIPE_STALL_FLAG,
- &ipipe_root_cpudom_var(status));
+ next_domain->irqs[irq].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 finalize;
- return;
+ goto out;
}
}
/* Ack the interrupt. */
pos = head;
-
while (pos != &__ipipe_pipeline) {
next_domain = list_entry(pos, struct ipipe_domain, p_link);
- /*
- * For each domain handling the incoming IRQ, mark it
- * as pending in its log.
- */
if (test_bit(IPIPE_HANDLE_FLAG, &next_domain->irqs[irq].control)) {
- /*
- * Domains that handle this IRQ are polled for
- * acknowledging it by decreasing priority
- * order. The interrupt must be made pending
- * _first_ in the domain's status flags before
- * the PIC is unlocked.
- */
__ipipe_set_irq_pending(next_domain, irq);
-
if (!m_ack && next_domain->irqs[irq].acknowledge != NULL) {
- next_domain->irqs[irq].acknowledge(irq, irq_desc + irq);
+ next_domain->irqs[irq].acknowledge(irq, irq_to_desc(irq));
m_ack = 1;
}
}
-
- /*
- * If the domain does not want the IRQ to be passed
- * down the interrupt pipe, exit the loop now.
- */
if (!test_bit(IPIPE_PASS_FLAG, &next_domain->irqs[irq].control))
break;
-
pos = next_domain->p_link.next;
}
@@ -166,18 +139,24 @@ void __ipipe_handle_irq(unsigned irq, struct pt_regs *regs)
* 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). */
+ * 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 (test_bit(IPIPE_ROOTLOCK_FLAG, &ipipe_root_domain->flags))
- s = __test_and_set_bit(IPIPE_STALL_FLAG,
- &ipipe_root_cpudom_var(status));
-finalize:
+ /*
+ * 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_head_cpudom_var(irqpend_himask) == 0)
+ goto out;
__ipipe_walk_pipeline(head);
-
+out:
if (!s)
- __clear_bit(IPIPE_STALL_FLAG,
- &ipipe_root_cpudom_var(status));
+ __clear_bit(IPIPE_STALL_FLAG, &p->status);
}
int __ipipe_check_root(void)
@@ -187,7 +166,7 @@ int __ipipe_check_root(void)
void __ipipe_enable_irqdesc(struct ipipe_domain *ipd, unsigned irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
int prio = desc->ic_prio;
desc->depth = 0;
@@ -199,7 +178,7 @@ EXPORT_SYMBOL(__ipipe_enable_irqdesc);
void __ipipe_disable_irqdesc(struct ipipe_domain *ipd, unsigned irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
int prio = desc->ic_prio;
if (ipd != &ipipe_root &&
@@ -236,15 +215,18 @@ int __ipipe_syscall_root(struct pt_regs *regs)
{
unsigned long flags;
- /* We need to run the IRQ tail hook whenever we don't
+ /*
+ * We need to run the IRQ tail hook whenever we don't
* propagate a syscall to higher domains, because we know that
* important operations might be pending there (e.g. Xenomai
- * deferred rescheduling). */
+ * deferred rescheduling).
+ */
- if (!__ipipe_syscall_watched_p(current, regs->orig_p0)) {
+ if (regs->orig_p0 < NR_syscalls) {
void (*hook)(void) = (void (*)(void))__ipipe_irq_tail_hook;
hook();
- return 0;
+ if ((current->flags & PF_EVNOTIFY) == 0)
+ return 0;
}
/*
@@ -312,112 +294,46 @@ 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
local_irq_save_hw(flags);
-
__ipipe_handle_irq(irq, NULL);
-
local_irq_restore_hw(flags);
return 1;
}
-/* Move Linux IRQ to threads. */
-
-static int do_irqd(void *__desc)
+asmlinkage void __ipipe_sync_root(void)
{
- struct irq_desc *desc = __desc;
- unsigned irq = desc - irq_desc;
- int thrprio = desc->thr_prio;
- int thrmask = 1 << thrprio;
- int cpu = smp_processor_id();
- cpumask_t cpumask;
-
- sigfillset(&current->blocked);
- current->flags |= PF_NOFREEZE;
- cpumask = cpumask_of_cpu(cpu);
- set_cpus_allowed(current, cpumask);
- ipipe_setscheduler_root(current, SCHED_FIFO, 50 + thrprio);
-
- while (!kthread_should_stop()) {
- local_irq_disable();
- if (!(desc->status & IRQ_SCHEDULED)) {
- set_current_state(TASK_INTERRUPTIBLE);
-resched:
- local_irq_enable();
- schedule();
- local_irq_disable();
- }
- __set_current_state(TASK_RUNNING);
- /*
- * If higher priority interrupt servers are ready to
- * run, reschedule immediately. We need this for the
- * GPIO demux IRQ handler to unmask the interrupt line
- * _last_, after all GPIO IRQs have run.
- */
- if (per_cpu(pending_irqthread_mask, cpu) & ~(thrmask|(thrmask-1)))
- goto resched;
- if (--per_cpu(pending_irq_count[thrprio], cpu) == 0)
- per_cpu(pending_irqthread_mask, cpu) &= ~thrmask;
- desc->status &= ~IRQ_SCHEDULED;
- desc->thr_handler(irq, &__raw_get_cpu_var(__ipipe_tick_regs));
- local_irq_enable();
- }
- __set_current_state(TASK_RUNNING);
- return 0;
-}
+ unsigned long flags;
-static void kick_irqd(unsigned irq, void *cookie)
-{
- struct irq_desc *desc = irq_desc + irq;
- int thrprio = desc->thr_prio;
- int thrmask = 1 << thrprio;
- int cpu = smp_processor_id();
-
- if (!(desc->status & IRQ_SCHEDULED)) {
- desc->status |= IRQ_SCHEDULED;
- per_cpu(pending_irqthread_mask, cpu) |= thrmask;
- ++per_cpu(pending_irq_count[thrprio], cpu);
- wake_up_process(desc->thread);
- }
-}
+ BUG_ON(irqs_disabled());
-int ipipe_start_irq_thread(unsigned irq, struct irq_desc *desc)
-{
- if (desc->thread || !create_irq_threads)
- return 0;
-
- desc->thread = kthread_create(do_irqd, desc, "IRQ %d", irq);
- if (desc->thread == NULL) {
- printk(KERN_ERR "irqd: could not create IRQ thread %d!\n", irq);
- return -ENOMEM;
- }
+ local_irq_save_hw(flags);
- wake_up_process(desc->thread);
+ clear_thread_flag(TIF_IRQ_SYNC);
- desc->thr_handler = ipipe_root_domain->irqs[irq].handler;
- ipipe_root_domain->irqs[irq].handler = &kick_irqd;
+ if (ipipe_root_cpudom_var(irqpend_himask) != 0)
+ __ipipe_sync_pipeline(IPIPE_IRQMASK_ANY);
- return 0;
+ local_irq_restore_hw(flags);
}
-void __init ipipe_init_irq_threads(void)
+void ___ipipe_sync_pipeline(unsigned long syncmask)
{
- unsigned irq;
- struct irq_desc *desc;
-
- create_irq_threads = 1;
+ struct ipipe_domain *ipd = ipipe_current_domain;
- for (irq = 0; irq < NR_IRQS; irq++) {
- desc = irq_desc + irq;
- if (desc->action != NULL ||
- (desc->status & IRQ_NOREQUEST) != 0)
- ipipe_start_irq_thread(irq, desc);
+ if (ipd == ipipe_root_domain) {
+ if (test_bit(IPIPE_SYNCDEFER_FLAG, &ipipe_root_cpudom_var(status)))
+ return;
}
+
+ __ipipe_sync_stage(syncmask);
}
EXPORT_SYMBOL(show_stack);
diff --git a/arch/blackfin/kernel/irqchip.c b/arch/blackfin/kernel/irqchip.c
index 75724eee649..7fd12656484 100644
--- a/arch/blackfin/kernel/irqchip.c
+++ b/arch/blackfin/kernel/irqchip.c
@@ -144,11 +144,15 @@ asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
#endif
generic_handle_irq(irq);
-#ifndef CONFIG_IPIPE /* Useless and bugous over the I-pipe: IRQs are threaded. */
- /* If we're the only interrupt running (ignoring IRQ15 which is for
- syscalls), lower our priority to IRQ14 so that softirqs run at
- that level. If there's another, lower-level interrupt, irq_exit
- will defer softirqs to that. */
+#ifndef CONFIG_IPIPE
+ /*
+ * If we're the only interrupt running (ignoring IRQ15 which
+ * is for syscalls), lower our priority to IRQ14 so that
+ * softirqs run at that level. If there's another,
+ * lower-level interrupt, irq_exit will defer softirqs to
+ * that. If the interrupt pipeline is enabled, we are already
+ * running at IRQ14 priority, so we don't need this code.
+ */
CSYNC();
pending = bfin_read_IPEND() & ~0x8000;
other_ints = pending & (pending - 1);
diff --git a/arch/blackfin/kernel/kgdb_test.c b/arch/blackfin/kernel/kgdb_test.c
index 3dba9c17304..dbcf3e45cb0 100644
--- a/arch/blackfin/kernel/kgdb_test.c
+++ b/arch/blackfin/kernel/kgdb_test.c
@@ -20,6 +20,7 @@
static char cmdline[256];
static unsigned long len;
+#ifndef CONFIG_SMP
static int num1 __attribute__((l1_data));
void kgdb_l1_test(void) __attribute__((l1_text));
@@ -32,6 +33,8 @@ void kgdb_l1_test(void)
printk(KERN_ALERT "L1(after change) : data variable addr = 0x%p, data value is %d\n", &num1, num1);
return ;
}
+#endif
+
#if L2_LENGTH
static int num2 __attribute__((l2));
@@ -59,10 +62,12 @@ int kgdb_test(char *name, int len, int count, int z)
static int test_proc_output(char *buf)
{
kgdb_test("hello world!", 12, 0x55, 0x10);
+#ifndef CONFIG_SMP
kgdb_l1_test();
- #if L2_LENGTH
+#endif
+#if L2_LENGTH
kgdb_l2_test();
- #endif
+#endif
return 0;
}
diff --git a/arch/blackfin/kernel/ptrace.c b/arch/blackfin/kernel/ptrace.c
index 594e325b40e..d76618db50d 100644
--- a/arch/blackfin/kernel/ptrace.c
+++ b/arch/blackfin/kernel/ptrace.c
@@ -45,6 +45,7 @@
#include <asm/asm-offsets.h>
#include <asm/dma.h>
#include <asm/fixed_code.h>
+#include <asm/cacheflush.h>
#include <asm/mem_map.h>
#define TEXT_OFFSET 0
@@ -240,7 +241,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
} else if (addr >= FIXED_CODE_START
&& addr + sizeof(tmp) <= FIXED_CODE_END) {
- memcpy(&tmp, (const void *)(addr), sizeof(tmp));
+ copy_from_user_page(0, 0, 0, &tmp, (const void *)(addr), sizeof(tmp));
copied = sizeof(tmp);
} else
@@ -320,7 +321,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
} else if (addr >= FIXED_CODE_START
&& addr + sizeof(data) <= FIXED_CODE_END) {
- memcpy((void *)(addr), &data, sizeof(data));
+ copy_to_user_page(0, 0, 0, (void *)(addr), &data, sizeof(data));
copied = sizeof(data);
} else
diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index e5c11623080..a58687bdee6 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -889,6 +889,10 @@ void __init setup_arch(char **cmdline_p)
CPU, bfin_revid());
}
+ /* We can't run on BF548-0.1 due to ANOMALY 05000448 */
+ if (bfin_cpuid() == 0x27de && bfin_revid() == 1)
+ panic("You can't run on this processor due to 05000448\n");
+
printk(KERN_INFO "Blackfin Linux support by http://blackfin.uclinux.org/\n");
printk(KERN_INFO "Processor Speed: %lu MHz core clock and %lu MHz System Clock\n",
@@ -1141,12 +1145,12 @@ static int show_cpuinfo(struct seq_file *m, void *v)
icache_size = 0;
seq_printf(m, "cache size\t: %d KB(L1 icache) "
- "%d KB(L1 dcache-%s) %d KB(L2 cache)\n",
+ "%d KB(L1 dcache%s) %d KB(L2 cache)\n",
icache_size, dcache_size,
#if defined CONFIG_BFIN_WB
- "wb"
+ "-wb"
#elif defined CONFIG_BFIN_WT
- "wt"
+ "-wt"
#endif
"", 0);
diff --git a/arch/blackfin/kernel/time.c b/arch/blackfin/kernel/time.c
index 172b4c58846..1bbacfbd4c5 100644
--- a/arch/blackfin/kernel/time.c
+++ b/arch/blackfin/kernel/time.c
@@ -134,7 +134,10 @@ irqreturn_t timer_interrupt(int irq, void *dummy)
write_seqlock(&xtime_lock);
#if defined(CONFIG_TICK_SOURCE_SYSTMR0) && !defined(CONFIG_IPIPE)
-/* FIXME: Here TIMIL0 is not set when IPIPE enabled, why? */
+ /*
+ * TIMIL0 is latched in __ipipe_grab_irq() when the I-Pipe is
+ * enabled.
+ */
if (get_gptimer_status(0) & TIMER_STATUS_TIMIL0) {
#endif
do_timer(1);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-09 09:01:51 +0000