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-rw-r--r--arch/arm/kernel/debug.S4
-rw-r--r--arch/arm/kernel/head.S65
-rw-r--r--arch/arm/kernel/irq.c3
-rw-r--r--arch/arm/kernel/smp.c38
-rw-r--r--arch/arm/kernel/smp_twd.c47
5 files changed, 63 insertions, 94 deletions
diff --git a/arch/arm/kernel/debug.S b/arch/arm/kernel/debug.S
index bcd66e00bdb..b7685f1bb04 100644
--- a/arch/arm/kernel/debug.S
+++ b/arch/arm/kernel/debug.S
@@ -22,7 +22,7 @@
#if defined(CONFIG_DEBUG_ICEDCC)
@@ debug using ARM EmbeddedICE DCC channel
- .macro addruart, rp, rv
+ .macro addruart, rp, rv, tmp
.endm
#if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K) || defined(CONFIG_CPU_V7)
@@ -106,7 +106,7 @@
#ifdef CONFIG_MMU
.macro addruart_current, rx, tmp1, tmp2
- addruart \tmp1, \tmp2
+ addruart \tmp1, \tmp2, \rx
mrc p15, 0, \rx, c1, c0
tst \rx, #1
moveq \rx, \tmp1
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 742b6108a00..673c806cc10 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -95,7 +95,7 @@ ENTRY(stext)
sub r4, r3, r4 @ (PHYS_OFFSET - PAGE_OFFSET)
add r8, r8, r4 @ PHYS_OFFSET
#else
- ldr r8, =PLAT_PHYS_OFFSET
+ ldr r8, =PHYS_OFFSET @ always constant in this case
#endif
/*
@@ -234,7 +234,7 @@ __create_page_tables:
* This allows debug messages to be output
* via a serial console before paging_init.
*/
- addruart r7, r3
+ addruart r7, r3, r0
mov r3, r3, lsr #20
mov r3, r3, lsl #2
@@ -488,13 +488,8 @@ __fixup_pv_table:
add r5, r5, r3 @ adjust table end address
add r7, r7, r3 @ adjust __pv_phys_offset address
str r8, [r7] @ save computed PHYS_OFFSET to __pv_phys_offset
-#ifndef CONFIG_ARM_PATCH_PHYS_VIRT_16BIT
mov r6, r3, lsr #24 @ constant for add/sub instructions
teq r3, r6, lsl #24 @ must be 16MiB aligned
-#else
- mov r6, r3, lsr #16 @ constant for add/sub instructions
- teq r3, r6, lsl #16 @ must be 64kiB aligned
-#endif
THUMB( it ne @ cross section branch )
bne __error
str r6, [r7, #4] @ save to __pv_offset
@@ -510,20 +505,8 @@ ENDPROC(__fixup_pv_table)
.text
__fixup_a_pv_table:
#ifdef CONFIG_THUMB2_KERNEL
-#ifdef CONFIG_ARM_PATCH_PHYS_VIRT_16BIT
- lsls r0, r6, #24
- lsr r6, #8
- beq 1f
- clz r7, r0
- lsr r0, #24
- lsl r0, r7
- bic r0, 0x0080
- lsrs r7, #1
- orrcs r0, #0x0080
- orr r0, r0, r7, lsl #12
-#endif
-1: lsls r6, #24
- beq 4f
+ lsls r6, #24
+ beq 2f
clz r7, r6
lsr r6, #24
lsl r6, r7
@@ -532,43 +515,25 @@ __fixup_a_pv_table:
orrcs r6, #0x0080
orr r6, r6, r7, lsl #12
orr r6, #0x4000
- b 4f
-2: @ at this point the C flag is always clear
- add r7, r3
-#ifdef CONFIG_ARM_PATCH_PHYS_VIRT_16BIT
- ldrh ip, [r7]
- tst ip, 0x0400 @ the i bit tells us LS or MS byte
- beq 3f
- cmp r0, #0 @ set C flag, and ...
- biceq ip, 0x0400 @ immediate zero value has a special encoding
- streqh ip, [r7] @ that requires the i bit cleared
-#endif
-3: ldrh ip, [r7, #2]
+ b 2f
+1: add r7, r3
+ ldrh ip, [r7, #2]
and ip, 0x8f00
- orrcc ip, r6 @ mask in offset bits 31-24
- orrcs ip, r0 @ mask in offset bits 23-16
+ orr ip, r6 @ mask in offset bits 31-24
strh ip, [r7, #2]
-4: cmp r4, r5
+2: cmp r4, r5
ldrcc r7, [r4], #4 @ use branch for delay slot
- bcc 2b
+ bcc 1b
bx lr
#else
-#ifdef CONFIG_ARM_PATCH_PHYS_VIRT_16BIT
- and r0, r6, #255 @ offset bits 23-16
- mov r6, r6, lsr #8 @ offset bits 31-24
-#else
- mov r0, #0 @ just in case...
-#endif
- b 3f
-2: ldr ip, [r7, r3]
+ b 2f
+1: ldr ip, [r7, r3]
bic ip, ip, #0x000000ff
- tst ip, #0x400 @ rotate shift tells us LS or MS byte
- orrne ip, ip, r6 @ mask in offset bits 31-24
- orreq ip, ip, r0 @ mask in offset bits 23-16
+ orr ip, ip, r6 @ mask in offset bits 31-24
str ip, [r7, r3]
-3: cmp r4, r5
+2: cmp r4, r5
ldrcc r7, [r4], #4 @ use branch for delay slot
- bcc 2b
+ bcc 1b
mov pc, lr
#endif
ENDPROC(__fixup_a_pv_table)
diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index 53919b230e8..7cb29261249 100644
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c
@@ -59,9 +59,6 @@ int arch_show_interrupts(struct seq_file *p, int prec)
#ifdef CONFIG_SMP
show_ipi_list(p, prec);
#endif
-#ifdef CONFIG_LOCAL_TIMERS
- show_local_irqs(p, prec);
-#endif
seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count);
return 0;
}
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 35417d0fb8a..a96c08cd612 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -457,10 +457,6 @@ u64 smp_irq_stat_cpu(unsigned int cpu)
for (i = 0; i < NR_IPI; i++)
sum += __get_irq_stat(cpu, ipi_irqs[i]);
-#ifdef CONFIG_LOCAL_TIMERS
- sum += __get_irq_stat(cpu, local_timer_irqs);
-#endif
-
return sum;
}
@@ -477,38 +473,6 @@ static void ipi_timer(void)
irq_exit();
}
-#ifdef CONFIG_LOCAL_TIMERS
-asmlinkage void __exception_irq_entry do_local_timer(struct pt_regs *regs)
-{
- handle_local_timer(regs);
-}
-
-void handle_local_timer(struct pt_regs *regs)
-{
- struct pt_regs *old_regs = set_irq_regs(regs);
- int cpu = smp_processor_id();
-
- if (local_timer_ack()) {
- __inc_irq_stat(cpu, local_timer_irqs);
- ipi_timer();
- }
-
- set_irq_regs(old_regs);
-}
-
-void show_local_irqs(struct seq_file *p, int prec)
-{
- unsigned int cpu;
-
- seq_printf(p, "%*s: ", prec, "LOC");
-
- for_each_present_cpu(cpu)
- seq_printf(p, "%10u ", __get_irq_stat(cpu, local_timer_irqs));
-
- seq_printf(p, " Local timer interrupts\n");
-}
-#endif
-
#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
static void smp_timer_broadcast(const struct cpumask *mask)
{
@@ -559,7 +523,7 @@ static void percpu_timer_stop(void)
unsigned int cpu = smp_processor_id();
struct clock_event_device *evt = &per_cpu(percpu_clockevent, cpu);
- evt->set_mode(CLOCK_EVT_MODE_UNUSED, evt);
+ local_timer_stop(evt);
}
#endif
diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c
index 01c186222f3..a8a6682d6b5 100644
--- a/arch/arm/kernel/smp_twd.c
+++ b/arch/arm/kernel/smp_twd.c
@@ -19,6 +19,7 @@
#include <linux/io.h>
#include <asm/smp_twd.h>
+#include <asm/localtimer.h>
#include <asm/hardware/gic.h>
/* set up by the platform code */
@@ -26,6 +27,8 @@ void __iomem *twd_base;
static unsigned long twd_timer_rate;
+static struct clock_event_device __percpu **twd_evt;
+
static void twd_set_mode(enum clock_event_mode mode,
struct clock_event_device *clk)
{
@@ -80,6 +83,12 @@ int twd_timer_ack(void)
return 0;
}
+void twd_timer_stop(struct clock_event_device *clk)
+{
+ twd_set_mode(CLOCK_EVT_MODE_UNUSED, clk);
+ disable_percpu_irq(clk->irq);
+}
+
static void __cpuinit twd_calibrate_rate(void)
{
unsigned long count;
@@ -119,11 +128,43 @@ static void __cpuinit twd_calibrate_rate(void)
}
}
+static irqreturn_t twd_handler(int irq, void *dev_id)
+{
+ struct clock_event_device *evt = *(struct clock_event_device **)dev_id;
+
+ if (twd_timer_ack()) {
+ evt->event_handler(evt);
+ return IRQ_HANDLED;
+ }
+
+ return IRQ_NONE;
+}
+
/*
* Setup the local clock events for a CPU.
*/
void __cpuinit twd_timer_setup(struct clock_event_device *clk)
{
+ struct clock_event_device **this_cpu_clk;
+
+ if (!twd_evt) {
+ int err;
+
+ twd_evt = alloc_percpu(struct clock_event_device *);
+ if (!twd_evt) {
+ pr_err("twd: can't allocate memory\n");
+ return;
+ }
+
+ err = request_percpu_irq(clk->irq, twd_handler,
+ "twd", twd_evt);
+ if (err) {
+ pr_err("twd: can't register interrupt %d (%d)\n",
+ clk->irq, err);
+ return;
+ }
+ }
+
twd_calibrate_rate();
clk->name = "local_timer";
@@ -137,8 +178,10 @@ void __cpuinit twd_timer_setup(struct clock_event_device *clk)
clk->max_delta_ns = clockevent_delta2ns(0xffffffff, clk);
clk->min_delta_ns = clockevent_delta2ns(0xf, clk);
+ this_cpu_clk = __this_cpu_ptr(twd_evt);
+ *this_cpu_clk = clk;
+
clockevents_register_device(clk);
- /* Make sure our local interrupt controller has this enabled */
- gic_enable_ppi(clk->irq);
+ enable_percpu_irq(clk->irq, 0);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-10-05 00:40:47 +0000