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openwrt-owl/target/linux/leon/patches/009-remove_second_timer.patch

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From 300f3ee36c3019ee36f81befd91cd1b32544cefe Mon Sep 17 00:00:00 2001
From: Daniel Hellstrom <daniel@gaisler.com>
Date: Wed, 22 Sep 2010 15:39:05 +0200
Subject: [PATCH] SPARC/LEON: Removed the need for two timers, per-cpu ticker is shared with system clock timer.
Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
---
arch/sparc/include/asm/leon.h | 2 +-
arch/sparc/include/asm/leon_amba.h | 3 +-
arch/sparc/kernel/entry.S | 3 +-
arch/sparc/kernel/leon_kernel.c | 37 ++++++++---------------------------
arch/sparc/kernel/leon_smp.c | 8 ++++++-
5 files changed, 21 insertions(+), 32 deletions(-)
--- a/arch/sparc/include/asm/leon.h
+++ b/arch/sparc/include/asm/leon.h
@@ -240,7 +240,7 @@ static inline int sparc_leon3_cpuid(void
#ifdef CONFIG_SMP
# define LEON3_IRQ_RESCHEDULE 13
-# define LEON3_IRQ_TICKER (leon_percpu_timer_dev[0].irq)
+# define LEON3_IRQ_TICKER (leon3_gptimer_irq + leon3_gptimer_idx)
# define LEON3_IRQ_CROSS_CALL 15
#endif
--- a/arch/sparc/include/asm/leon_amba.h
+++ b/arch/sparc/include/asm/leon_amba.h
@@ -182,11 +182,12 @@ void _amba_init(struct device_node *dp,
extern struct leon3_irqctrl_regs_map *leon3_irqctrl_regs;
extern struct leon3_gptimer_regs_map *leon3_gptimer_regs;
-extern struct amba_apb_device leon_percpu_timer_dev[16];
extern int leondebug_irq_disable;
extern int leon_debug_irqout;
extern unsigned long leon3_gptimer_irq;
+extern unsigned long leon3_gptimer_idx; /* Timer Index (starting at 0) with Timer Core */
extern unsigned int sparc_leon_eirq;
+extern unsigned long leon3_cpu_idx;
#endif /* __ASSEMBLY__ */
--- a/arch/sparc/kernel/entry.S
+++ b/arch/sparc/kernel/entry.S
@@ -411,8 +411,9 @@ smpleon_ticker:
WRITE_PAUSE
wr %g2, PSR_ET, %psr
WRITE_PAUSE
+ mov %l7, %o0 ! irq level
call leon_percpu_timer_interrupt
- add %sp, STACKFRAME_SZ, %o0
+ add %sp, STACKFRAME_SZ, %o1 ! pt_regs
wr %l0, PSR_ET, %psr
WRITE_PAUSE
RESTORE_ALL
--- a/arch/sparc/kernel/leon_kernel.c
+++ b/arch/sparc/kernel/leon_kernel.c
@@ -25,7 +25,6 @@
struct leon3_irqctrl_regs_map *leon3_irqctrl_regs = NULL; /* interrupt controller base address, initialized by amba_init() */
struct leon3_gptimer_regs_map *leon3_gptimer_regs = NULL; /* timer controller base address, initialized by amba_init() */
-struct amba_apb_device leon_percpu_timer_dev[16];
int leondebug_irq_disable;
int leon_debug_irqout;
@@ -34,6 +33,7 @@ static int dummy_master_l10_counter;
unsigned long leon3_gptimer_irq = 0; /* interrupt controller irq number, initialized by amba_init() */
unsigned long leon3_gptimer_idx = 0; /* Timer Index (starting at 0) with Timer Core */
unsigned int sparc_leon_eirq;
+unsigned long leon3_cpu_idx = 0; /* Boot CPU Index */
#define LEON_IMASK ((&leon3_irqctrl_regs->mask[0]))
/* Return the IRQ of the pending IRQ on the extended IRQ controller */
@@ -109,13 +109,14 @@ void __init leon_init_timers(irq_handler
struct device_node *rootnp, *np;
struct property *pp;
int len;
- int cpu, icsel;
+ int icsel;
int ampopts;
leondebug_irq_disable = 0;
leon_debug_irqout = 0;
master_l10_counter = (unsigned int *)&dummy_master_l10_counter;
dummy_master_l10_counter = 0;
+ leon3_cpu_idx = sparc_leon3_cpuid();
/* Find IRQMP IRQ Controller Registers base address otherwise bail out. */
rootnp = of_find_node_by_path("/ambapp0");
@@ -152,21 +153,11 @@ void __init leon_init_timers(irq_handler
(((1000000 / HZ) - 1)));
LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 0);
-#ifdef CONFIG_SMP
- leon_percpu_timer_dev[0].start = (int)leon3_gptimer_regs;
- leon_percpu_timer_dev[0].irq = leon3_gptimer_irq+1+leon3_gptimer_idx;
-
if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) &
(1<<LEON3_GPTIMER_SEPIRQ))) {
- prom_printf("irq timer not configured with separate irqs\n");
- BUG();
+ prom_printf("LEON-SMP: GPTIMER use shared irqs, using other timers will fail.\n");
}
- LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].val, 0);
- LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].rld, (((1000000 / HZ) - 1)));
- LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl, 0);
-# endif
-
/* The IRQ controller may (if implemented) consist of multiple
* IRQ controllers, each mapped on a 4Kb boundary.
* Each CPU may be routed to different IRQCTRLs, however
@@ -175,9 +166,8 @@ void __init leon_init_timers(irq_handler
* accessed anyway.
* In AMP systems, Linux may not be run on CPU0.
*/
- cpu = sparc_leon3_cpuid();
- icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[cpu/8]);
- icsel = (icsel >> ((7 - (cpu&0x7)) * 4)) & 0xf;
+ icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[leon3_cpu_idx/8]);
+ icsel = (icsel >> ((7 - (leon3_cpu_idx & 0x7)) * 4)) & 0xf;
leon3_irqctrl_regs += icsel;
LEON3_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mask[0]), 0);
@@ -204,7 +194,8 @@ void __init leon_init_timers(irq_handler
# ifdef CONFIG_SMP
{
unsigned long flags;
- struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (leon_percpu_timer_dev[0].irq - 1)];
+ struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 +
+ (leon3_gptimer_irq + leon3_gptimer_idx - 1)];
/* For SMP we use the level 14 ticker, however the bootup code
* has copied the firmwares level 14 vector into boot cpu's
@@ -222,21 +213,11 @@ void __init leon_init_timers(irq_handler
}
# endif
- if (leon3_gptimer_regs) {
- LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
+ LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
LEON3_GPTIMER_EN |
LEON3_GPTIMER_RL |
LEON3_GPTIMER_LD | LEON3_GPTIMER_IRQEN);
-#ifdef CONFIG_SMP
- LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
- LEON3_GPTIMER_EN |
- LEON3_GPTIMER_RL |
- LEON3_GPTIMER_LD |
- LEON3_GPTIMER_IRQEN);
-#endif
-
- }
}
void leon_clear_clock_irq(void)
--- a/arch/sparc/kernel/leon_smp.c
+++ b/arch/sparc/kernel/leon_smp.c
@@ -52,6 +52,7 @@ extern volatile unsigned long cpu_callin
extern unsigned char boot_cpu_id;
extern cpumask_t smp_commenced_mask;
void __init leon_configure_cache_smp(void);
+extern void handler_irq(int irq, struct pt_regs * regs);
static inline unsigned long do_swap(volatile unsigned long *ptr,
unsigned long val)
@@ -385,7 +386,7 @@ void leon_cross_call_irq(void)
ccall_info.processors_out[i] = 1;
}
-void leon_percpu_timer_interrupt(struct pt_regs *regs)
+void leon_percpu_timer_interrupt(int irq, struct pt_regs *regs)
{
struct pt_regs *old_regs;
int cpu = smp_processor_id();
@@ -406,6 +407,11 @@ void leon_percpu_timer_interrupt(struct
prof_counter(cpu) = prof_multiplier(cpu);
}
set_irq_regs(old_regs);
+
+ if ( cpu == leon3_cpu_idx ) {
+ /* Ticker Clock is shared with the System Clock */
+ handler_irq(irq, regs);
+ }
}
static void __init smp_setup_percpu_timer(void)
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