From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
To: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: tglx@linutronix.de, arnd@arndb.de,
Vineet Gupta <Vineet.Gupta1@synopsys.com>
Subject: [RFC PATCH v1 02/31] ARC: irqflags
Date: Wed, 7 Nov 2012 10:47:25 +0100 [thread overview]
Message-ID: <1352281674-2186-3-git-send-email-vgupta@synopsys.com> (raw)
In-Reply-To: <1352281674-2186-1-git-send-email-vgupta@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---
arch/arc/include/asm/arcregs.h | 114 +++++++++++++++++++++++++++++++
arch/arc/include/asm/irqflags.h | 143 +++++++++++++++++++++++++++++++++++++++
arch/arc/kernel/irq.c | 32 +++++++++
3 files changed, 289 insertions(+), 0 deletions(-)
create mode 100644 arch/arc/include/asm/arcregs.h
create mode 100644 arch/arc/include/asm/irqflags.h
create mode 100644 arch/arc/kernel/irq.c
diff --git a/arch/arc/include/asm/arcregs.h b/arch/arc/include/asm/arcregs.h
new file mode 100644
index 0000000..8ca8faf
--- /dev/null
+++ b/arch/arc/include/asm/arcregs.h
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _ASM_ARC_ARCREGS_H
+#define _ASM_ARC_ARCREGS_H
+
+#ifdef __KERNEL__
+
+/* status32 Bits Positions */
+#define STATUS_H_BIT 0 /* CPU Halted */
+#define STATUS_E1_BIT 1 /* Int 1 enable */
+#define STATUS_E2_BIT 2 /* Int 2 enable */
+#define STATUS_A1_BIT 3 /* Int 1 active */
+#define STATUS_A2_BIT 4 /* Int 2 active */
+#define STATUS_AE_BIT 5 /* Exception active */
+#define STATUS_DE_BIT 6 /* PC is in delay slot */
+#define STATUS_U_BIT 7 /* User/Kernel mode */
+#define STATUS_L_BIT 12 /* Loop inhibit */
+
+/* These masks correspond to the status word(STATUS_32) bits */
+#define STATUS_H_MASK (1<<STATUS_H_BIT)
+#define STATUS_E1_MASK (1<<STATUS_E1_BIT)
+#define STATUS_E2_MASK (1<<STATUS_E2_BIT)
+#define STATUS_A1_MASK (1<<STATUS_A1_BIT)
+#define STATUS_A2_MASK (1<<STATUS_A2_BIT)
+#define STATUS_AE_MASK (1<<STATUS_AE_BIT)
+#define STATUS_DE_MASK (1<<STATUS_DE_BIT)
+#define STATUS_U_MASK (1<<STATUS_U_BIT)
+#define STATUS_L_MASK (1<<STATUS_L_BIT)
+
+/* Auxiliary registers */
+#define AUX_IDENTITY 4
+#define AUX_INTR_VEC_BASE 0x25
+#define AUX_IRQ_LEV 0x200 /* IRQ Priority: L1 or L2 */
+#define AUX_IRQ_HINT 0x201 /* For generating Soft Interrupts */
+#define AUX_IRQ_LV12 0x43 /* interrupt level register */
+
+#define AUX_IENABLE 0x40c
+#define AUX_ITRIGGER 0x40d
+#define AUX_IPULSE 0x415
+
+#ifndef __ASSEMBLY__
+
+/*
+ ******************************************************************
+ * Inline ASM macros to read/write AUX Regs
+ * Essentially invocation of lr/sr insns from "C"
+ */
+
+#if 1
+
+#define read_aux_reg(reg) __builtin_arc_lr(reg)
+
+/* gcc builtin sr needs reg param to be long immediate */
+#define write_aux_reg(reg_immed, val) \
+ __builtin_arc_sr((unsigned int)val, reg_immed)
+
+#else
+
+#define read_aux_reg(reg) \
+({ \
+ unsigned int __ret; \
+ __asm__ __volatile__( \
+ " lr %0, [%1]" \
+ : "=r"(__ret) \
+ : "i"(reg)); \
+ __ret; \
+})
+
+/*
+ * Aux Reg address is specified as long immediate by caller
+ * e.g.
+ * write_aux_reg(0x69, some_val);
+ * This generates tightest code.
+ */
+#define write_aux_reg(reg_imm, val) \
+({ \
+ __asm__ __volatile__( \
+ " sr %0, [%1] \n" \
+ : \
+ : "ir"(val), "i"(reg_imm)); \
+})
+
+/*
+ * Aux Reg address is specified in a variable
+ * * e.g.
+ * reg_num = 0x69
+ * write_aux_reg2(reg_num, some_val);
+ * This has to generate glue code to load the reg num from
+ * memory to a reg hence not recommended.
+ */
+#define write_aux_reg2(reg_in_var, val) \
+({ \
+ unsigned int tmp; \
+ \
+ __asm__ __volatile__( \
+ " ld %0, [%2] \n\t" \
+ " sr %1, [%0] \n\t" \
+ : "=&r"(tmp) \
+ : "r"(val), "memory"(®_in_var)); \
+})
+
+#endif
+
+#endif /* __ASEMBLY__ */
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_ARC_ARCREGS_H */
diff --git a/arch/arc/include/asm/irqflags.h b/arch/arc/include/asm/irqflags.h
new file mode 100644
index 0000000..752e55d
--- /dev/null
+++ b/arch/arc/include/asm/irqflags.h
@@ -0,0 +1,143 @@
+/*
+ * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __ASM_ARC_IRQFLAGS_H
+#define __ASM_ARC_IRQFLAGS_H
+
+/* vineetg: March 2010 : local_irq_save( ) optimisation
+ * -Remove explicit mov of current status32 into reg, that is not needed
+ * -Use BIC insn instead of INVERTED + AND
+ * -Conditionally disable interrupts (if they are not enabled, don't disable)
+*/
+
+#ifdef __KERNEL__
+
+#include <asm/arcregs.h>
+
+#ifndef __ASSEMBLY__
+
+/******************************************************************
+ * IRQ Control Macros
+ ******************************************************************/
+
+/*
+ * Save IRQ state and disable IRQs
+ */
+static inline long arch_local_irq_save(void)
+{
+ unsigned long temp, flags;
+
+ __asm__ __volatile__(
+ " lr %1, [status32] \n"
+ " bic %0, %1, %2 \n"
+ " and.f 0, %1, %2 \n"
+ " flag.nz %0 \n"
+ : "=r"(temp), "=r"(flags)
+ : "n"((STATUS_E1_MASK | STATUS_E2_MASK))
+ : "cc");
+
+ return flags;
+}
+
+/*
+ * restore saved IRQ state
+ */
+static inline void arch_local_irq_restore(unsigned long flags)
+{
+
+ __asm__ __volatile__(
+ " flag %0 \n"
+ :
+ : "r"(flags));
+}
+
+/*
+ * Conditionally Enable IRQs
+ */
+extern void arch_local_irq_enable(void);
+
+/*
+ * Unconditionally Disable IRQs
+ */
+static inline void arch_local_irq_disable(void)
+{
+ unsigned long temp;
+
+ __asm__ __volatile__(
+ " lr %0, [status32] \n"
+ " and %0, %0, %1 \n"
+ " flag %0 \n"
+ : "=&r"(temp)
+ : "n"(~(STATUS_E1_MASK | STATUS_E2_MASK)));
+}
+
+/*
+ * save IRQ state
+ */
+static inline long arch_local_save_flags(void)
+{
+ unsigned long temp;
+
+ __asm__ __volatile__(
+ " lr %0, [status32] \n"
+ : "=&r"(temp));
+
+ return temp;
+}
+
+/*
+ * Query IRQ state
+ */
+static inline int arch_irqs_disabled_flags(unsigned long flags)
+{
+ return !(flags & (STATUS_E1_MASK));
+}
+
+static inline int arch_irqs_disabled(void)
+{
+ return arch_irqs_disabled_flags(arch_local_save_flags());
+}
+
+static inline void arch_mask_irq(unsigned int irq)
+{
+ unsigned int ienb;
+
+ ienb = read_aux_reg(AUX_IENABLE);
+ ienb &= ~(1 << irq);
+ write_aux_reg(AUX_IENABLE, ienb);
+}
+
+static inline void arch_unmask_irq(unsigned int irq)
+{
+ unsigned int ienb;
+
+ ienb = read_aux_reg(AUX_IENABLE);
+ ienb |= (1 << irq);
+ write_aux_reg(AUX_IENABLE, ienb);
+}
+
+#else
+
+.macro IRQ_DISABLE scratch
+ lr \scratch, [status32]
+ bic \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK)
+ flag \scratch
+.endm
+
+.macro IRQ_DISABLE_SAVE scratch, save
+ lr \scratch, [status32]
+ mov \save, \scratch /* Make a copy */
+ bic \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK)
+ flag \scratch
+.endm
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* KERNEL */
+
+#endif
diff --git a/arch/arc/kernel/irq.c b/arch/arc/kernel/irq.c
new file mode 100644
index 0000000..16fcbe8
--- /dev/null
+++ b/arch/arc/kernel/irq.c
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2011-12 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <asm/irqflags.h>
+#include <asm/arcregs.h>
+
+void arch_local_irq_enable(void)
+{
+
+ unsigned long flags;
+ flags = arch_local_save_flags();
+ flags |= (STATUS_E1_MASK | STATUS_E2_MASK);
+
+ /*
+ * If called from hard ISR (between irq_enter and irq_exit)
+ * don't allow Level 1. In Soft ISR we allow further Level 1s
+ */
+
+ if (in_irq())
+ flags &= ~(STATUS_E1_MASK | STATUS_E2_MASK);
+
+ arch_local_irq_restore(flags);
+}
+EXPORT_SYMBOL(arch_local_irq_enable);
--
1.7.4.1
next prev parent reply other threads:[~2012-11-07 9:48 UTC|newest]
Thread overview: 107+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-07 9:47 [RFC Patch v1 00/31] Synopsys ARC Linux kernel Port Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 01/31] ARC: Generic Headers Vineet Gupta
2012-11-07 9:47 ` Vineet Gupta [this message]
2012-11-12 19:50 ` [RFC PATCH v1 02/31] ARC: irqflags Thomas Gleixner
2013-01-01 7:44 ` Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 03/31] ARC: atomic/bitops/cmpxchg/barriers Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 04/31] asm-generic headers: uaccess.h to conditionally define segment_eq() Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 05/31] ARC: uaccess friends Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 06/31] asm-generic headers: Allow yet more arch overrides in checksum.h Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 07/31] ARC: checksum/byteorder/swab routines Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 08/31] ARC: Fundamental ARCH data-types/defines Vineet Gupta
2012-11-08 7:10 ` Jonas Bonn
2012-11-08 18:52 ` Vineet Gupta
2012-11-08 20:36 ` Jonas Bonn
2012-11-12 13:58 ` Vineet Gupta
2012-11-12 14:12 ` Arnd Bergmann
2012-11-07 9:47 ` [RFC PATCH v1 09/31] ARC: spinlock/rwlock/mutex primitives Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 10/31] ARC: string library Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 11/31] ARC: Low level IRQ/Trap/Exception(non-MMU) Handling Vineet Gupta
2012-11-16 4:58 ` Al Viro
2012-12-27 9:00 ` Vineet Gupta
2012-12-27 13:29 ` Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 12/31] ARC: Interrupt Handling Vineet Gupta
2012-11-12 20:08 ` Thomas Gleixner
2013-01-01 10:46 ` Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 13/31] ARC: Non-MMU Exception Handling Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 14/31] ARC: syscall support Vineet Gupta
2012-11-07 14:21 ` Arnd Bergmann
2012-11-09 9:50 ` James Hogan
2012-11-13 11:41 ` James Hogan
2012-11-13 12:01 ` Jonas Bonn
2012-11-13 12:11 ` James Hogan
2012-11-14 12:23 ` Arnd Bergmann
2012-11-14 12:31 ` James Hogan
2012-11-13 10:13 ` Gilad Ben-Yossef
2012-11-13 10:37 ` Arnd Bergmann
2012-11-15 6:15 ` Vineet Gupta
2012-11-15 12:35 ` Arnd Bergmann
2013-01-17 5:13 ` Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 15/31] ARC: Process/scheduling/clock/Timers/Delay Management Vineet Gupta
2012-11-12 20:29 ` Thomas Gleixner
2013-01-02 7:13 ` Vineet Gupta
2013-01-02 8:45 ` Vineet Gupta
2013-01-04 13:01 ` Frederic Weisbecker
2012-11-07 9:47 ` [RFC PATCH v1 16/31] ARC: Signal handling Vineet Gupta
2012-11-16 5:26 ` Al Viro
2012-12-28 12:34 ` Vineet Gupta
2012-12-28 12:42 ` [PATCH 1/2] ARC: [Review] Preparing to fix incorrect syscall restarts due to signals Vineet Gupta
2012-12-28 12:42 ` [PATCH 2/2] ARC: [Review] Prevent incorrect syscall restarts Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 17/31] ARC: Cache Flush Management Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 18/31] ARC: Page Table Management Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 19/31] ARC: MMU Context Management Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 20/31] ARC: MMU Exception Handling Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 21/31] ARC: TLB flush Handling Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 22/31] ARC: Page Fault handling (incl uaccess fixup) Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 23/31] ARC: I/O and DMA Mappings Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 24/31] ARC: startup #1: low-level, setup_arch(), /proc/cpuinfo, mem init Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 25/31] ARC: [plat-arcfpga] Hooking up platform to ARC UART Vineet Gupta
2012-11-07 14:16 ` Arnd Bergmann
2013-01-07 13:10 ` Vineet Gupta
2013-01-07 13:46 ` Arnd Bergmann
2013-01-07 14:04 ` Vineet Gupta
2013-01-07 14:36 ` Arnd Bergmann
2013-01-14 7:35 ` early init dt for earlyprintk (was Re: [RFC PATCH v1 25/31] ARC: [plat-arcfpga] Hooking up platform to ARC UART) Vineet Gupta
2013-01-14 9:48 ` James Hogan
2013-01-14 10:09 ` Vineet Gupta
2013-01-14 10:54 ` Arnd Bergmann
2013-01-17 7:29 ` [RFC PATCH v1 25/31] ARC: [plat-arcfpga] Hooking up platform to ARC UART Vineet Gupta
2013-01-17 10:52 ` Arnd Bergmann
2012-11-07 9:47 ` [RFC PATCH v1 26/31] ARC: Build system: Makefiles, Kconfig, Linker script Vineet Gupta
2012-11-07 14:13 ` Arnd Bergmann
2013-01-02 14:30 ` Vineet Gupta
2013-01-02 14:48 ` Arnd Bergmann
2013-01-03 7:58 ` Vineet Gupta
2013-01-03 8:25 ` Arnd Bergmann
2013-03-11 12:29 ` SYSV IPC broken for no-legacy syscall kernels (was Re: [RFC PATCH v1 26/31] ARC: Build system: Makefiles, Kconfig, Linker script) Vineet Gupta
2013-03-11 12:44 ` James Hogan
2013-03-11 12:56 ` Vineet Gupta
2013-03-11 13:07 ` James Hogan
2013-03-11 13:30 ` Arnd Bergmann
2013-03-11 13:48 ` Vineet Gupta
2013-03-11 14:50 ` Arnd Bergmann
2012-11-15 17:49 ` [RFC PATCH v1 26/31] ARC: Build system: Makefiles, Kconfig, Linker script James Hogan
2012-11-15 19:30 ` Ralf Baechle
2012-11-16 6:36 ` Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 27/31] ARC: Last bits (stubs) to get to a running kernel with UART Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 28/31] ARC: split ret_from_fork, simplify kernel_thread() Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 29/31] ARC: switch to generic kernel_thread() Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 30/31] ARC: switch to generic kernel_execve() and sys_execve() Vineet Gupta
2012-11-16 4:08 ` Al Viro
2012-11-17 14:01 ` Vineet Gupta
2012-11-07 9:47 ` [RFC PATCH v1 31/31] ARC: [plat-arcfpga] defconfig Vineet Gupta
2012-11-07 14:06 ` Arnd Bergmann
2012-11-12 14:18 ` James Hogan
2012-11-12 14:21 ` Arnd Bergmann
2012-11-07 14:36 ` [RFC Patch v1 00/31] Synopsys ARC Linux kernel Port Arnd Bergmann
2012-11-08 19:09 ` Vineet Gupta
2012-11-07 20:46 ` Gilad Ben-Yossef
2012-11-20 13:47 ` Pavel Machek
2012-11-20 13:49 ` Vineet Gupta
2012-11-20 13:59 ` Pavel Machek
2012-11-20 14:17 ` Vineet Gupta
2013-01-18 19:46 ` Pavel Machek
2013-01-18 22:17 ` Arnd Bergmann
2013-01-19 10:15 ` Pavel Machek
2013-01-19 12:32 ` Vineet Gupta
2013-01-19 17:02 ` Pavel Machek
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