X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=arch%2Fmips%2Fmips-boards%2Fgeneric%2Ftime.c;h=a9f6124b3a227ee722288a5b239ddbfff3f821dc;hb=d90125bfe958ed0451c6b98f831c86aba08b43d5;hp=16315444dd5acf489f04bbad6231cf0cc8d25201;hpb=e766f1cc596078b1603ac2c96617660c4c7e2d81;p=linux-2.6 diff --git a/arch/mips/mips-boards/generic/time.c b/arch/mips/mips-boards/generic/time.c index 16315444dd..a9f6124b3a 100644 --- a/arch/mips/mips-boards/generic/time.c +++ b/arch/mips/mips-boards/generic/time.c @@ -30,49 +30,142 @@ #include #include +#include #include +#include +#include #include #include #include #include +#include #include #include +#include +#include unsigned long cpu_khz; -#if defined(CONFIG_MIPS_SEAD) -#define ALLINTS (IE_IRQ0 | IE_IRQ1 | IE_IRQ5) -#else -#define ALLINTS (IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5) -#endif - #if defined(CONFIG_MIPS_ATLAS) static char display_string[] = " LINUX ON ATLAS "; #endif #if defined(CONFIG_MIPS_MALTA) +#if defined(CONFIG_MIPS_MT_SMTC) +static char display_string[] = " SMTC LINUX ON MALTA "; +#else static char display_string[] = " LINUX ON MALTA "; +#endif /* CONFIG_MIPS_MT_SMTC */ #endif #if defined(CONFIG_MIPS_SEAD) static char display_string[] = " LINUX ON SEAD "; #endif -static unsigned int display_count = 0; +static unsigned int display_count; #define MAX_DISPLAY_COUNT (sizeof(display_string) - 8) -#define MIPS_CPU_TIMER_IRQ (NR_IRQS-1) +#define CPUCTR_IMASKBIT (0x100 << MIPSCPU_INT_CPUCTR) -static unsigned int timer_tick_count=0; +static unsigned int timer_tick_count; +static int mips_cpu_timer_irq; +extern void smtc_timer_broadcast(int); -void mips_timer_interrupt(struct pt_regs *regs) +static inline void scroll_display_message(void) { if ((timer_tick_count++ % HZ) == 0) { mips_display_message(&display_string[display_count++]); if (display_count == MAX_DISPLAY_COUNT) - display_count = 0; + display_count = 0; + } +} + +static void mips_timer_dispatch (struct pt_regs *regs) +{ + do_IRQ (mips_cpu_timer_irq, regs); +} + +/* + * Redeclare until I get around mopping the timer code insanity on MIPS. + */ +extern int null_perf_irq(struct pt_regs *regs); +extern int (*perf_irq)(struct pt_regs *regs); + +irqreturn_t mips_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs) +{ + int cpu = smp_processor_id(); + int r2 = cpu_has_mips_r2; + +#ifdef CONFIG_MIPS_MT_SMTC + /* + * In an SMTC system, one Count/Compare set exists per VPE. + * Which TC within a VPE gets the interrupt is essentially + * random - we only know that it shouldn't be one with + * IXMT set. Whichever TC gets the interrupt needs to + * send special interprocessor interrupts to the other + * TCs to make sure that they schedule, etc. + * + * That code is specific to the SMTC kernel, not to + * the a particular platform, so it's invoked from + * the general MIPS timer_interrupt routine. + */ + + /* + * DVPE is necessary so long as cross-VPE interrupts + * are done via read-modify-write of Cause register. + */ + int vpflags = dvpe(); + write_c0_compare (read_c0_count() - 1); + clear_c0_cause(CPUCTR_IMASKBIT); + evpe(vpflags); + + if (cpu_data[cpu].vpe_id == 0) { + timer_interrupt(irq, dev_id, regs); + scroll_display_message(); + } else + write_c0_compare (read_c0_count() + ( mips_hpt_frequency/HZ)); + smtc_timer_broadcast(cpu_data[cpu].vpe_id); + + if (cpu != 0) + /* + * Other CPUs should do profiling and process accounting + */ + local_timer_interrupt(irq, dev_id, regs); + +#else /* CONFIG_MIPS_MT_SMTC */ + if (cpu == 0) { + /* + * CPU 0 handles the global timer interrupt job and process + * accounting resets count/compare registers to trigger next + * timer int. + */ + if (!r2 || (read_c0_cause() & (1 << 26))) + if (perf_irq(regs)) + goto out; + + /* we keep interrupt disabled all the time */ + if (!r2 || (read_c0_cause() & (1 << 30))) + timer_interrupt(irq, NULL, regs); + + scroll_display_message(); + } else { + /* Everyone else needs to reset the timer int here as + ll_local_timer_interrupt doesn't */ + /* + * FIXME: need to cope with counter underflow. + * More support needs to be added to kernel/time for + * counter/timer interrupts on multiple CPU's + */ + write_c0_compare(read_c0_count() + (mips_hpt_frequency/HZ)); + + /* + * Other CPUs should do profiling and process accounting + */ + local_timer_interrupt(irq, dev_id, regs); } +#endif /* CONFIG_MIPS_MT_SMTC */ - ll_timer_interrupt(MIPS_CPU_TIMER_IRQ, regs); +out: + return IRQ_HANDLED; } /* @@ -83,7 +176,7 @@ static unsigned int __init estimate_cpu_frequency(void) unsigned int prid = read_c0_prid() & 0xffff00; unsigned int count; -#ifdef CONFIG_MIPS_SEAD +#if defined(CONFIG_MIPS_SEAD) || defined(CONFIG_MIPS_SIM) /* * The SEAD board doesn't have a real time clock, so we can't * really calculate the timer frequency @@ -140,10 +233,8 @@ void __init mips_time_init(void) local_irq_save(flags); -#if defined(CONFIG_MIPS_ATLAS) || defined(CONFIG_MIPS_MALTA) /* Set Data mode - binary. */ CMOS_WRITE(CMOS_READ(RTC_CONTROL) | RTC_DM_BINARY, RTC_CONTROL); -#endif est_freq = estimate_cpu_frequency (); @@ -157,11 +248,33 @@ void __init mips_time_init(void) void __init mips_timer_setup(struct irqaction *irq) { + if (cpu_has_veic) { + set_vi_handler (MSC01E_INT_CPUCTR, mips_timer_dispatch); + mips_cpu_timer_irq = MSC01E_INT_BASE + MSC01E_INT_CPUCTR; + } + else { + if (cpu_has_vint) + set_vi_handler (MIPSCPU_INT_CPUCTR, mips_timer_dispatch); + mips_cpu_timer_irq = MIPSCPU_INT_BASE + MIPSCPU_INT_CPUCTR; + } + + /* we are using the cpu counter for timer interrupts */ - irq->handler = no_action; /* we use our own handler */ - setup_irq(MIPS_CPU_TIMER_IRQ, irq); + irq->handler = mips_timer_interrupt; /* we use our own handler */ +#ifdef CONFIG_MIPS_MT_SMTC + setup_irq_smtc(mips_cpu_timer_irq, irq, CPUCTR_IMASKBIT); +#else + setup_irq(mips_cpu_timer_irq, irq); +#endif /* CONFIG_MIPS_MT_SMTC */ + +#ifdef CONFIG_SMP + /* irq_desc(riptor) is a global resource, when the interrupt overlaps + on seperate cpu's the first one tries to handle the second interrupt. + The effect is that the int remains disabled on the second cpu. + Mark the interrupt with IRQ_PER_CPU to avoid any confusion */ + irq_desc[mips_cpu_timer_irq].status |= IRQ_PER_CPU; +#endif /* to generate the first timer interrupt */ write_c0_compare (read_c0_count() + mips_hpt_frequency/HZ); - set_c0_status(ALLINTS); }