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