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Diffstat (limited to 'arch/blackfin/include/asm/ipipe.h')
| -rw-r--r-- | arch/blackfin/include/asm/ipipe.h | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/arch/blackfin/include/asm/ipipe.h b/arch/blackfin/include/asm/ipipe.h new file mode 100644 index 00000000000..76f53d8b9a0 --- /dev/null +++ b/arch/blackfin/include/asm/ipipe.h @@ -0,0 +1,278 @@ +/* -*- linux-c -*- + * include/asm-blackfin/ipipe.h + * + * Copyright (C) 2002-2007 Philippe Gerum. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, Inc., 675 Mass Ave, Cambridge MA 02139, + * USA; either version 2 of the License, or (at your option) any later + * version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#ifndef __ASM_BLACKFIN_IPIPE_H +#define __ASM_BLACKFIN_IPIPE_H + +#ifdef CONFIG_IPIPE + +#include <linux/cpumask.h> +#include <linux/list.h> +#include <linux/threads.h> +#include <linux/irq.h> +#include <linux/ipipe_percpu.h> +#include <asm/ptrace.h> +#include <asm/irq.h> +#include <asm/bitops.h> +#include <asm/atomic.h> +#include <asm/traps.h> + +#define IPIPE_ARCH_STRING "1.8-00" +#define IPIPE_MAJOR_NUMBER 1 +#define IPIPE_MINOR_NUMBER 8 +#define IPIPE_PATCH_NUMBER 0 + +#ifdef CONFIG_SMP +#error "I-pipe/blackfin: SMP not implemented" +#else /* !CONFIG_SMP */ +#define ipipe_processor_id() 0 +#endif /* CONFIG_SMP */ + +#define prepare_arch_switch(next) \ +do { \ + ipipe_schedule_notify(current, next); \ + local_irq_disable_hw(); \ +} while (0) + +#define task_hijacked(p) \ + ({ \ + int __x__ = ipipe_current_domain != ipipe_root_domain; \ + /* We would need to clear the SYNC flag for the root domain */ \ + /* over the current processor in SMP mode. */ \ + local_irq_enable_hw(); __x__; \ + }) + +struct ipipe_domain; + +struct ipipe_sysinfo { + + int ncpus; /* Number of CPUs on board */ + u64 cpufreq; /* CPU frequency (in Hz) */ + + /* Arch-dependent block */ + + struct { + unsigned tmirq; /* Timer tick IRQ */ + u64 tmfreq; /* Timer frequency */ + } archdep; +}; + +#define ipipe_read_tsc(t) \ + ({ \ + unsigned long __cy2; \ + __asm__ __volatile__ ("1: %0 = CYCLES2\n" \ + "%1 = CYCLES\n" \ + "%2 = CYCLES2\n" \ + "CC = %2 == %0\n" \ + "if ! CC jump 1b\n" \ + : "=r" (((unsigned long *)&t)[1]), \ + "=r" (((unsigned long *)&t)[0]), \ + "=r" (__cy2) \ + : /*no input*/ : "CC"); \ + t; \ + }) + +#define ipipe_cpu_freq() __ipipe_core_clock +#define ipipe_tsc2ns(_t) (((unsigned long)(_t)) * __ipipe_freq_scale) +#define ipipe_tsc2us(_t) (ipipe_tsc2ns(_t) / 1000 + 1) + +/* Private interface -- Internal use only */ + +#define __ipipe_check_platform() do { } while (0) + +#define __ipipe_init_platform() do { } while (0) + +extern atomic_t __ipipe_irq_lvdepth[IVG15 + 1]; + +extern unsigned long __ipipe_irq_lvmask; + +extern struct ipipe_domain ipipe_root; + +/* enable/disable_irqdesc _must_ be used in pairs. */ + +void __ipipe_enable_irqdesc(struct ipipe_domain *ipd, + unsigned irq); + +void __ipipe_disable_irqdesc(struct ipipe_domain *ipd, + unsigned irq); + +#define __ipipe_enable_irq(irq) (irq_desc[irq].chip->unmask(irq)) + +#define __ipipe_disable_irq(irq) (irq_desc[irq].chip->mask(irq)) + +#define __ipipe_lock_root() \ + set_bit(IPIPE_ROOTLOCK_FLAG, &ipipe_root_domain->flags) + +#define __ipipe_unlock_root() \ + clear_bit(IPIPE_ROOTLOCK_FLAG, &ipipe_root_domain->flags) + +void __ipipe_enable_pipeline(void); + +#define __ipipe_hook_critical_ipi(ipd) do { } while (0) + +#define __ipipe_sync_pipeline(syncmask) \ + do { \ + struct ipipe_domain *ipd = ipipe_current_domain; \ + if (likely(ipd != ipipe_root_domain || !test_bit(IPIPE_ROOTLOCK_FLAG, &ipd->flags))) \ + __ipipe_sync_stage(syncmask); \ + } while (0) + +void __ipipe_handle_irq(unsigned irq, struct pt_regs *regs); + +int __ipipe_get_irq_priority(unsigned irq); + +int __ipipe_get_irqthread_priority(unsigned irq); + +void __ipipe_stall_root_raw(void); + +void __ipipe_unstall_root_raw(void); + +void __ipipe_serial_debug(const char *fmt, ...); + +DECLARE_PER_CPU(struct pt_regs, __ipipe_tick_regs); + +extern unsigned long __ipipe_core_clock; + +extern unsigned long __ipipe_freq_scale; + +extern unsigned long __ipipe_irq_tail_hook; + +static inline unsigned long __ipipe_ffnz(unsigned long ul) +{ + return ffs(ul) - 1; +} + +#define __ipipe_run_irqtail() /* Must be a macro */ \ + do { \ + asmlinkage void __ipipe_call_irqtail(void); \ + unsigned long __pending; \ + CSYNC(); \ + __pending = bfin_read_IPEND(); \ + if (__pending & 0x8000) { \ + __pending &= ~0x8010; \ + if (__pending && (__pending & (__pending - 1)) == 0) \ + __ipipe_call_irqtail(); \ + } \ + } while (0) + +#define __ipipe_run_isr(ipd, irq) \ + do { \ + if (ipd == ipipe_root_domain) { \ + /* \ + * Note: the I-pipe implements a threaded interrupt model on \ + * this arch for Linux external IRQs. The interrupt handler we \ + * call here only wakes up the associated IRQ thread. \ + */ \ + if (ipipe_virtual_irq_p(irq)) { \ + /* No irqtail here; virtual interrupts have no effect \ + on IPEND so there is no need for processing \ + deferral. */ \ + local_irq_enable_nohead(ipd); \ + ipd->irqs[irq].handler(irq, ipd->irqs[irq].cookie); \ + local_irq_disable_nohead(ipd); \ + } else \ + /* \ + * No need to run the irqtail here either; \ + * we can't be preempted by hw IRQs, so \ + * non-Linux IRQs cannot stack over the short \ + * thread wakeup code. Which in turn means \ + * that no irqtail condition could be pending \ + * for domains above Linux in the pipeline. \ + */ \ + ipd->irqs[irq].handler(irq, &__raw_get_cpu_var(__ipipe_tick_regs)); \ + } else { \ + __clear_bit(IPIPE_SYNC_FLAG, &ipipe_cpudom_var(ipd, status)); \ + local_irq_enable_nohead(ipd); \ + ipd->irqs[irq].handler(irq, ipd->irqs[irq].cookie); \ + /* Attempt to exit the outer interrupt level before \ + * starting the deferred IRQ processing. */ \ + local_irq_disable_nohead(ipd); \ + __ipipe_run_irqtail(); \ + __set_bit(IPIPE_SYNC_FLAG, &ipipe_cpudom_var(ipd, status)); \ + } \ + } while (0) + +#define __ipipe_syscall_watched_p(p, sc) \ + (((p)->flags & PF_EVNOTIFY) || (unsigned long)sc >= NR_syscalls) + +void ipipe_init_irq_threads(void); + +int ipipe_start_irq_thread(unsigned irq, struct irq_desc *desc); + +#define IS_SYSIRQ(irq) ((irq) > IRQ_CORETMR && (irq) <= SYS_IRQS) +#define IS_GPIOIRQ(irq) ((irq) >= GPIO_IRQ_BASE && (irq) < NR_IRQS) + +#define IRQ_SYSTMR IRQ_TIMER0 +#define IRQ_PRIOTMR CONFIG_IRQ_TIMER0 + +#if defined(CONFIG_BF531) || defined(CONFIG_BF532) || defined(CONFIG_BF533) +#define PRIO_GPIODEMUX(irq) CONFIG_PFA +#elif defined(CONFIG_BF534) || defined(CONFIG_BF536) || defined(CONFIG_BF537) +#define PRIO_GPIODEMUX(irq) CONFIG_IRQ_PROG_INTA +#elif defined(CONFIG_BF52x) +#define PRIO_GPIODEMUX(irq) ((irq) == IRQ_PORTF_INTA ? CONFIG_IRQ_PORTF_INTA : \ + (irq) == IRQ_PORTG_INTA ? CONFIG_IRQ_PORTG_INTA : \ + (irq) == IRQ_PORTH_INTA ? CONFIG_IRQ_PORTH_INTA : \ + -1) +#elif defined(CONFIG_BF561) +#define PRIO_GPIODEMUX(irq) ((irq) == IRQ_PROG0_INTA ? CONFIG_IRQ_PROG0_INTA : \ + (irq) == IRQ_PROG1_INTA ? CONFIG_IRQ_PROG1_INTA : \ + (irq) == IRQ_PROG2_INTA ? CONFIG_IRQ_PROG2_INTA : \ + -1) +#define bfin_write_TIMER_DISABLE(val) bfin_write_TMRS8_DISABLE(val) +#define bfin_write_TIMER_ENABLE(val) bfin_write_TMRS8_ENABLE(val) +#define bfin_write_TIMER_STATUS(val) bfin_write_TMRS8_STATUS(val) +#define bfin_read_TIMER_STATUS() bfin_read_TMRS8_STATUS() +#elif defined(CONFIG_BF54x) +#define PRIO_GPIODEMUX(irq) ((irq) == IRQ_PINT0 ? CONFIG_IRQ_PINT0 : \ + (irq) == IRQ_PINT1 ? CONFIG_IRQ_PINT1 : \ + (irq) == IRQ_PINT2 ? CONFIG_IRQ_PINT2 : \ + (irq) == IRQ_PINT3 ? CONFIG_IRQ_PINT3 : \ + -1) +#define bfin_write_TIMER_DISABLE(val) bfin_write_TIMER_DISABLE0(val) +#define bfin_write_TIMER_ENABLE(val) bfin_write_TIMER_ENABLE0(val) +#define bfin_write_TIMER_STATUS(val) bfin_write_TIMER_STATUS0(val) +#define bfin_read_TIMER_STATUS(val) bfin_read_TIMER_STATUS0(val) +#else +# error "no PRIO_GPIODEMUX() for this part" +#endif + +#define __ipipe_root_tick_p(regs) ((regs->ipend & 0x10) != 0) + +#else /* !CONFIG_IPIPE */ + +#define task_hijacked(p) 0 +#define ipipe_trap_notify(t, r) 0 + +#define __ipipe_stall_root_raw() do { } while (0) +#define __ipipe_unstall_root_raw() do { } while (0) + +#define ipipe_init_irq_threads() do { } while (0) +#define ipipe_start_irq_thread(irq, desc) 0 + +#define IRQ_SYSTMR IRQ_CORETMR +#define IRQ_PRIOTMR IRQ_CORETMR + +#define __ipipe_root_tick_p(regs) 1 + +#endif /* !CONFIG_IPIPE */ + +#endif /* !__ASM_BLACKFIN_IPIPE_H */ |