icu.c
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上传日期:2013-04-10
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- /*
- * FILE NAME
- * arch/mips/vr41xx/vr4122/common/icu.c
- *
- * BRIEF MODULE DESCRIPTION
- * Interrupt Control Unit routines for the NEC VR4122 and VR4131.
- *
- * Author: Yoichi Yuasa
- * yyuasa@mvista.com or source@mvista.com
- *
- * Copyright 2001,2002 MontaVista Software Inc.
- *
- * 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; either version 2 of the License, or (at your
- * option) any later version.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
- * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
- * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * 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.,
- * 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- /*
- * Changes:
- * MontaVista Software Inc. <yyuasa@mvista.com> or <source@mvista.com>
- * - Added support for NEC VR4111 and VR4121.
- *
- * Paul Mundt <lethal@chaoticdreams.org>
- * - kgdb support.
- *
- * MontaVista Software Inc. <yyuasa@mvista.com> or <source@mvista.com>
- * - New creation, NEC VR4122 and VR4131 are supported.
- */
- #include <linux/errno.h>
- #include <linux/init.h>
- #include <linux/interrupt.h>
- #include <linux/irq.h>
- #include <linux/types.h>
- #include <asm/addrspace.h>
- #include <asm/cpu.h>
- #include <asm/gdb-stub.h>
- #include <asm/io.h>
- #include <asm/mipsregs.h>
- #include <asm/vr41xx/vr41xx.h>
- #define MIPS_CPU_IRQ_BASE 0
- #define SYSINT1_IRQ_BASE 8
- #define SYSINT1_IRQ_LAST 23
- #define SYSINT2_IRQ_BASE 24
- #define SYSINT2_IRQ_LAST 39
- #define GIUINT_IRQ_BASE GIU_IRQ(0)
- #define GIUINT_IRQ_LAST GIU_IRQ(31)
- #define ICU_CASCADE_IRQ (MIPS_CPU_IRQ_BASE + 2)
- extern asmlinkage void vr41xx_handle_interrupt(void);
- extern void __init init_generic_irq(void);
- extern void mips_cpu_irq_init(u32 irq_base);
- extern unsigned int do_IRQ(int irq, struct pt_regs *regs);
- extern void vr41xx_giuint_init(void);
- extern unsigned int giuint_do_IRQ(int pin, struct pt_regs *regs);
- static u32 vr41xx_icu1_base = 0;
- static u32 vr41xx_icu2_base = 0;
- #define VR4111_SYSINT1REG KSEG1ADDR(0x0b000080)
- #define VR4111_SYSINT2REG KSEG1ADDR(0x0b000200)
- #define VR4122_SYSINT1REG KSEG1ADDR(0x0f000080)
- #define VR4122_SYSINT2REG KSEG1ADDR(0x0f0000a0)
- #define SYSINT1REG 0x00
- #define GIUINTLREG 0x08
- #define MSYSINT1REG 0x0c
- #define MGIUINTLREG 0x14
- #define NMIREG 0x18
- #define SOFTREG 0x1a
- #define SYSINT2REG 0x00
- #define GIUINTHREG 0x02
- #define MSYSINT2REG 0x06
- #define MGIUINTHREG 0x08
- #define read_icu1(offset) readw(vr41xx_icu1_base + (offset))
- #define write_icu1(val, offset) writew((val), vr41xx_icu1_base + (offset))
- #define read_icu2(offset) readw(vr41xx_icu2_base + (offset))
- #define write_icu2(val, offset) writew((val), vr41xx_icu2_base + (offset))
- static inline u16 set_icu1(u16 offset, u16 set)
- {
- u16 res;
- res = read_icu1(offset);
- res |= set;
- write_icu1(res, offset);
- return res;
- }
- static inline u16 clear_icu1(u16 offset, u16 clear)
- {
- u16 res;
- res = read_icu1(offset);
- res &= ~clear;
- write_icu1(res, offset);
- return res;
- }
- static inline u16 set_icu2(u16 offset, u16 set)
- {
- u16 res;
- res = read_icu2(offset);
- res |= set;
- write_icu2(res, offset);
- return res;
- }
- static inline u16 clear_icu2(u16 offset, u16 clear)
- {
- u16 res;
- res = read_icu2(offset);
- res &= ~clear;
- write_icu2(res, offset);
- return res;
- }
- /*=======================================================================*/
- static void enable_sysint1_irq(unsigned int irq)
- {
- set_icu1(MSYSINT1REG, (u16)1 << (irq - SYSINT1_IRQ_BASE));
- }
- static void disable_sysint1_irq(unsigned int irq)
- {
- clear_icu1(MSYSINT1REG, (u16)1 << (irq - SYSINT1_IRQ_BASE));
- }
- static unsigned int startup_sysint1_irq(unsigned int irq)
- {
- set_icu1(MSYSINT1REG, (u16)1 << (irq - SYSINT1_IRQ_BASE));
- return 0; /* never anything pending */
- }
- #define shutdown_sysint1_irq disable_sysint1_irq
- #define ack_sysint1_irq disable_sysint1_irq
- static void end_sysint1_irq(unsigned int irq)
- {
- if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
- set_icu1(MSYSINT1REG, (u16)1 << (irq - SYSINT1_IRQ_BASE));
- }
- static struct hw_interrupt_type sysint1_irq_type = {
- "SYSINT1",
- startup_sysint1_irq,
- shutdown_sysint1_irq,
- enable_sysint1_irq,
- disable_sysint1_irq,
- ack_sysint1_irq,
- end_sysint1_irq,
- NULL
- };
- /*=======================================================================*/
- static void enable_sysint2_irq(unsigned int irq)
- {
- set_icu2(MSYSINT2REG, (u16)1 << (irq - SYSINT2_IRQ_BASE));
- }
- static void disable_sysint2_irq(unsigned int irq)
- {
- clear_icu2(MSYSINT2REG, (u16)1 << (irq - SYSINT2_IRQ_BASE));
- }
- static unsigned int startup_sysint2_irq(unsigned int irq)
- {
- set_icu2(MSYSINT2REG, (u16)1 << (irq - SYSINT2_IRQ_BASE));
- return 0; /* never anything pending */
- }
- #define shutdown_sysint2_irq disable_sysint2_irq
- #define ack_sysint2_irq disable_sysint2_irq
- static void end_sysint2_irq(unsigned int irq)
- {
- if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
- set_icu2(MSYSINT2REG, (u16)1 << (irq - SYSINT2_IRQ_BASE));
- }
- static struct hw_interrupt_type sysint2_irq_type = {
- "SYSINT2",
- startup_sysint2_irq,
- shutdown_sysint2_irq,
- enable_sysint2_irq,
- disable_sysint2_irq,
- ack_sysint2_irq,
- end_sysint2_irq,
- NULL
- };
- /*=======================================================================*/
- extern void vr41xx_enable_giuint(u8 pin);
- extern void vr41xx_disable_giuint(u8 pin);
- extern void vr41xx_clear_giuint(u8 pin);
- static void enable_giuint_irq(unsigned int irq)
- {
- u8 pin;
- pin = irq - GIUINT_IRQ_BASE;
- if (pin < 16)
- set_icu1(MGIUINTLREG, (u16)1 << pin);
- else
- set_icu2(MGIUINTHREG, (u16)1 << (pin - 16));
- vr41xx_enable_giuint(pin);
- }
- static void disable_giuint_irq(unsigned int irq)
- {
- u8 pin;
- pin = irq - GIUINT_IRQ_BASE;
- vr41xx_disable_giuint(pin);
- if (pin < 16)
- clear_icu1(MGIUINTLREG, (u16)1 << pin);
- else
- clear_icu2(MGIUINTHREG, (u16)1 << (pin - 16));
- }
- static unsigned int startup_giuint_irq(unsigned int irq)
- {
- vr41xx_clear_giuint(irq - GIUINT_IRQ_BASE);
- enable_giuint_irq(irq);
- return 0; /* never anything pending */
- }
- #define shutdown_giuint_irq disable_giuint_irq
- static void ack_giuint_irq(unsigned int irq)
- {
- disable_giuint_irq(irq);
- vr41xx_clear_giuint(irq - GIUINT_IRQ_BASE);
- }
- static void end_giuint_irq(unsigned int irq)
- {
- if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
- enable_giuint_irq(irq);
- }
- static struct hw_interrupt_type giuint_irq_type = {
- "GIUINT",
- startup_giuint_irq,
- shutdown_giuint_irq,
- enable_giuint_irq,
- disable_giuint_irq,
- ack_giuint_irq,
- end_giuint_irq,
- NULL
- };
- /*=======================================================================*/
- static struct irqaction icu_cascade = {no_action, 0, 0, "cascade", NULL, NULL};
- static void __init vr41xx_icu_init(void)
- {
- int i;
- switch (mips_cpu.cputype) {
- case CPU_VR4111:
- case CPU_VR4121:
- vr41xx_icu1_base = VR4111_SYSINT1REG;
- vr41xx_icu2_base = VR4111_SYSINT2REG;
- break;
- case CPU_VR4122:
- case CPU_VR4131:
- vr41xx_icu1_base = VR4122_SYSINT1REG;
- vr41xx_icu2_base = VR4122_SYSINT2REG;
- break;
- default:
- panic("Unexpected CPU of NEC VR4100 series");
- break;
- }
- write_icu1(0, MSYSINT1REG);
- write_icu1(0, MGIUINTLREG);
- write_icu2(0, MSYSINT2REG);
- write_icu2(0, MGIUINTHREG);
- for (i = SYSINT1_IRQ_BASE; i <= GIUINT_IRQ_LAST; i++) {
- if (i >= SYSINT1_IRQ_BASE && i <= SYSINT1_IRQ_LAST)
- irq_desc[i].handler = &sysint1_irq_type;
- else if (i >= SYSINT2_IRQ_BASE && i <= SYSINT2_IRQ_LAST)
- irq_desc[i].handler = &sysint2_irq_type;
- else if (i >= GIUINT_IRQ_BASE && i <= GIUINT_IRQ_LAST)
- irq_desc[i].handler = &giuint_irq_type;
- }
- setup_irq(ICU_CASCADE_IRQ, &icu_cascade);
- }
- void __init init_IRQ(void)
- {
- memset(irq_desc, 0, sizeof(irq_desc));
- init_generic_irq();
- mips_cpu_irq_init(MIPS_CPU_IRQ_BASE);
- vr41xx_icu_init();
- vr41xx_giuint_init();
- set_except_vector(0, vr41xx_handle_interrupt);
- #ifdef CONFIG_REMOTE_DEBUG
- printk("Setting debug traps - please connect the remote debugger.n");
- set_debug_traps();
- breakpoint();
- #endif
- }
- /*=======================================================================*/
- static inline void giuint_irqdispatch(u16 pendl, u16 pendh, struct pt_regs *regs)
- {
- int i;
- if (pendl) {
- for (i = 0; i < 16; i++) {
- if (pendl & (0x0001 << i)) {
- giuint_do_IRQ(i, regs);
- return;
- }
- }
- }
- else if (pendh) {
- for (i = 0; i < 16; i++) {
- if (pendh & (0x0001 << i)) {
- giuint_do_IRQ(i + 16, regs);
- return;
- }
- }
- }
- }
- asmlinkage void icu_irqdispatch(struct pt_regs *regs)
- {
- u16 pend1, pend2, pendl, pendh;
- u16 mask1, mask2, maskl, maskh;
- int i;
- pend1 = read_icu1(SYSINT1REG);
- mask1 = read_icu1(MSYSINT1REG);
- pend2 = read_icu2(SYSINT2REG);
- mask2 = read_icu2(MSYSINT2REG);
- pendl = read_icu1(GIUINTLREG);
- maskl = read_icu1(MGIUINTLREG);
- pendh = read_icu2(GIUINTHREG);
- maskh = read_icu2(MGIUINTHREG);
- pend1 &= mask1;
- pend2 &= mask2;
- pendl &= maskl;
- pendh &= maskh;
- if (pend1) {
- if ((pend1 & 0x01ff) == 0x0100) {
- giuint_irqdispatch(pendl, pendh, regs);
- }
- else {
- for (i = 0; i < 16; i++) {
- if (pend1 & (0x0001 << i)) {
- do_IRQ(SYSINT1_IRQ_BASE + i, regs);
- break;
- }
- }
- }
- return;
- }
- else if (pend2) {
- for (i = 0; i < 16; i++) {
- if (pend2 & (0x0001 << i)) {
- do_IRQ(SYSINT2_IRQ_BASE + i, regs);
- break;
- }
- }
- }
- }