1 /*
2  *  Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org>
3  *
4  *  This program is free software; you can redistribute  it and/or modify it
5  *  under  the terms of  the GNU General  Public License as published by the
6  *  Free Software Foundation;  either version 2 of the  License, or (at your
7  *  option) any later version.
8  *
9  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
10  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
11  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
12  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
13  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
14  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
15  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
16  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
17  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
18  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
19  *
20  *  You should have received a copy of the  GNU General Public License along
21  *  with this program; if not, write  to the Free Software Foundation, Inc.,
22  *  675 Mass Ave, Cambridge, MA 02139, USA.
23  */
24 
25 #include "bcm47xx_private.h"
26 
27 #include <linux/types.h>
28 #include <linux/interrupt.h>
29 #include <linux/irq.h>
30 #include <asm/setup.h>
31 #include <asm/irq_cpu.h>
32 #include <bcm47xx.h>
33 
plat_irq_dispatch(void)34 asmlinkage void plat_irq_dispatch(void)
35 {
36 	u32 cause;
37 
38 	cause = read_c0_cause() & read_c0_status() & CAUSEF_IP;
39 
40 	clear_c0_status(cause);
41 
42 	if (cause & CAUSEF_IP7)
43 		do_IRQ(7);
44 	if (cause & CAUSEF_IP2)
45 		do_IRQ(2);
46 	if (cause & CAUSEF_IP3)
47 		do_IRQ(3);
48 	if (cause & CAUSEF_IP4)
49 		do_IRQ(4);
50 	if (cause & CAUSEF_IP5)
51 		do_IRQ(5);
52 	if (cause & CAUSEF_IP6)
53 		do_IRQ(6);
54 }
55 
56 #define DEFINE_HWx_IRQDISPATCH(x)					\
57 	static void bcm47xx_hw ## x ## _irqdispatch(void)		\
58 	{								\
59 		do_IRQ(x);						\
60 	}
61 DEFINE_HWx_IRQDISPATCH(2)
62 DEFINE_HWx_IRQDISPATCH(3)
63 DEFINE_HWx_IRQDISPATCH(4)
64 DEFINE_HWx_IRQDISPATCH(5)
65 DEFINE_HWx_IRQDISPATCH(6)
66 DEFINE_HWx_IRQDISPATCH(7)
67 
arch_init_irq(void)68 void __init arch_init_irq(void)
69 {
70 	/*
71 	 * This is the first arch callback after mm_init (we can use kmalloc),
72 	 * so let's finish bus initialization now.
73 	 */
74 	bcm47xx_bus_setup();
75 
76 #ifdef CONFIG_BCM47XX_BCMA
77 	if (bcm47xx_bus_type == BCM47XX_BUS_TYPE_BCMA) {
78 		bcma_write32(bcm47xx_bus.bcma.bus.drv_mips.core,
79 			     BCMA_MIPS_MIPS74K_INTMASK(5), 1 << 31);
80 		/*
81 		 * the kernel reads the timer irq from some register and thinks
82 		 * it's #5, but we offset it by 2 and route to #7
83 		 */
84 		cp0_compare_irq = 7;
85 	}
86 #endif
87 	mips_cpu_irq_init();
88 
89 	if (cpu_has_vint) {
90 		pr_info("Setting up vectored interrupts\n");
91 		set_vi_handler(2, bcm47xx_hw2_irqdispatch);
92 		set_vi_handler(3, bcm47xx_hw3_irqdispatch);
93 		set_vi_handler(4, bcm47xx_hw4_irqdispatch);
94 		set_vi_handler(5, bcm47xx_hw5_irqdispatch);
95 		set_vi_handler(6, bcm47xx_hw6_irqdispatch);
96 		set_vi_handler(7, bcm47xx_hw7_irqdispatch);
97 	}
98 }
99