2 * Common tx4927 irq handler
4 * Author: MontaVista Software, Inc.
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
11 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
12 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
14 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
15 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
16 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
17 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
18 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
19 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
20 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
22 * You should have received a copy of the GNU General Public License along
23 * with this program; if not, write to the Free Software Foundation, Inc.,
24 * 675 Mass Ave, Cambridge, MA 02139, USA.
26 #include <linux/errno.h>
27 #include <linux/init.h>
28 #include <linux/kernel_stat.h>
29 #include <linux/module.h>
30 #include <linux/signal.h>
31 #include <linux/sched.h>
32 #include <linux/types.h>
33 #include <linux/interrupt.h>
34 #include <linux/ioport.h>
35 #include <linux/timex.h>
36 #include <linux/slab.h>
37 #include <linux/random.h>
38 #include <linux/irq.h>
39 #include <linux/bitops.h>
40 #include <asm/bootinfo.h>
43 #include <asm/mipsregs.h>
44 #include <asm/system.h>
45 #include <asm/tx4927/tx4927.h>
51 #undef TX4927_IRQ_DEBUG
53 #ifdef TX4927_IRQ_DEBUG
54 #define TX4927_IRQ_NONE 0x00000000
56 #define TX4927_IRQ_INFO ( 1 << 0 )
57 #define TX4927_IRQ_WARN ( 1 << 1 )
58 #define TX4927_IRQ_EROR ( 1 << 2 )
60 #define TX4927_IRQ_INIT ( 1 << 5 )
61 #define TX4927_IRQ_NEST1 ( 1 << 6 )
62 #define TX4927_IRQ_NEST2 ( 1 << 7 )
63 #define TX4927_IRQ_NEST3 ( 1 << 8 )
64 #define TX4927_IRQ_NEST4 ( 1 << 9 )
66 #define TX4927_IRQ_CP0_INIT ( 1 << 10 )
67 #define TX4927_IRQ_CP0_ENABLE ( 1 << 13 )
68 #define TX4927_IRQ_CP0_DISABLE ( 1 << 14 )
70 #define TX4927_IRQ_PIC_INIT ( 1 << 20 )
71 #define TX4927_IRQ_PIC_ENABLE ( 1 << 23 )
72 #define TX4927_IRQ_PIC_DISABLE ( 1 << 24 )
74 #define TX4927_IRQ_ALL 0xffffffff
77 #ifdef TX4927_IRQ_DEBUG
78 static const u32 tx4927_irq_debug_flag = (TX4927_IRQ_NONE
80 | TX4927_IRQ_WARN | TX4927_IRQ_EROR
81 // | TX4927_IRQ_CP0_INIT
82 // | TX4927_IRQ_CP0_ENABLE
83 // | TX4927_IRQ_CP0_ENDIRQ
84 // | TX4927_IRQ_PIC_INIT
85 // | TX4927_IRQ_PIC_ENABLE
86 // | TX4927_IRQ_PIC_DISABLE
95 #ifdef TX4927_IRQ_DEBUG
96 #define TX4927_IRQ_DPRINTK(flag,str...) \
97 if ( (tx4927_irq_debug_flag) & (flag) ) \
100 sprintf( tmp, str ); \
101 printk( "%s(%s:%u)::%s", __FUNCTION__, __FILE__, __LINE__, tmp ); \
104 #define TX4927_IRQ_DPRINTK(flag,str...)
108 * Forwad definitions for all pic's
111 static void tx4927_irq_cp0_enable(unsigned int irq);
112 static void tx4927_irq_cp0_disable(unsigned int irq);
114 static void tx4927_irq_pic_enable(unsigned int irq);
115 static void tx4927_irq_pic_disable(unsigned int irq);
118 * Kernel structs for all pic's
121 #define TX4927_CP0_NAME "TX4927-CP0"
122 static struct irq_chip tx4927_irq_cp0_type = {
123 .typename = TX4927_CP0_NAME,
124 .ack = tx4927_irq_cp0_disable,
125 .mask = tx4927_irq_cp0_disable,
126 .mask_ack = tx4927_irq_cp0_disable,
127 .unmask = tx4927_irq_cp0_enable,
130 #define TX4927_PIC_NAME "TX4927-PIC"
131 static struct irq_chip tx4927_irq_pic_type = {
132 .typename = TX4927_PIC_NAME,
133 .ack = tx4927_irq_pic_disable,
134 .mask = tx4927_irq_pic_disable,
135 .mask_ack = tx4927_irq_pic_disable,
136 .unmask = tx4927_irq_pic_enable,
139 #define TX4927_PIC_ACTION(s) { no_action, 0, CPU_MASK_NONE, s, NULL, NULL }
140 static struct irqaction tx4927_irq_pic_action =
141 TX4927_PIC_ACTION(TX4927_PIC_NAME);
143 #define CCP0_STATUS 12
144 #define CCP0_CAUSE 13
150 #define tx4927_irq_cp0_mask(irq) ( 1 << ( irq-TX4927_IRQ_CP0_BEG+8 ) )
153 tx4927_irq_cp0_modify(unsigned cp0_reg, unsigned clr_bits, unsigned set_bits)
155 unsigned long val = 0;
159 val = read_c0_status();
163 val = read_c0_cause();
173 write_c0_status(val);
183 static void __init tx4927_irq_cp0_init(void)
187 TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_INIT, "beg=%d end=%d\n",
188 TX4927_IRQ_CP0_BEG, TX4927_IRQ_CP0_END);
190 for (i = TX4927_IRQ_CP0_BEG; i <= TX4927_IRQ_CP0_END; i++)
191 set_irq_chip_and_handler(i, &tx4927_irq_cp0_type,
195 static void tx4927_irq_cp0_enable(unsigned int irq)
197 TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_ENABLE, "irq=%d \n", irq);
199 tx4927_irq_cp0_modify(CCP0_STATUS, 0, tx4927_irq_cp0_mask(irq));
202 static void tx4927_irq_cp0_disable(unsigned int irq)
204 TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_DISABLE, "irq=%d \n", irq);
206 tx4927_irq_cp0_modify(CCP0_STATUS, tx4927_irq_cp0_mask(irq), 0);
212 u32 tx4927_irq_pic_addr(int irq)
214 /* MVMCP -- need to formulize this */
215 irq -= TX4927_IRQ_PIC_BEG;
269 u32 tx4927_irq_pic_mask(int irq)
271 /* MVMCP -- need to formulize this */
272 irq -= TX4927_IRQ_PIC_BEG;
318 static void tx4927_irq_pic_modify(unsigned pic_reg, unsigned clr_bits,
321 unsigned long val = 0;
323 val = TX4927_RD(pic_reg);
326 TX4927_WR(pic_reg, val);
329 static void __init tx4927_irq_pic_init(void)
333 TX4927_IRQ_DPRINTK(TX4927_IRQ_PIC_INIT, "beg=%d end=%d\n",
334 TX4927_IRQ_PIC_BEG, TX4927_IRQ_PIC_END);
336 for (i = TX4927_IRQ_PIC_BEG; i <= TX4927_IRQ_PIC_END; i++)
337 set_irq_chip_and_handler(i, &tx4927_irq_pic_type,
340 setup_irq(TX4927_IRQ_NEST_PIC_ON_CP0, &tx4927_irq_pic_action);
342 TX4927_WR(0xff1ff640, 0x6); /* irq level mask -- only accept hightest */
343 TX4927_WR(0xff1ff600, TX4927_RD(0xff1ff600) | 0x1); /* irq enable */
346 static void tx4927_irq_pic_enable(unsigned int irq)
348 TX4927_IRQ_DPRINTK(TX4927_IRQ_PIC_ENABLE, "irq=%d\n", irq);
350 tx4927_irq_pic_modify(tx4927_irq_pic_addr(irq), 0,
351 tx4927_irq_pic_mask(irq));
354 static void tx4927_irq_pic_disable(unsigned int irq)
356 TX4927_IRQ_DPRINTK(TX4927_IRQ_PIC_DISABLE, "irq=%d\n", irq);
358 tx4927_irq_pic_modify(tx4927_irq_pic_addr(irq),
359 tx4927_irq_pic_mask(irq), 0);
363 * Main init functions
365 void __init tx4927_irq_init(void)
367 TX4927_IRQ_DPRINTK(TX4927_IRQ_INIT, "-\n");
369 TX4927_IRQ_DPRINTK(TX4927_IRQ_INIT, "=Calling tx4927_irq_cp0_init()\n");
370 tx4927_irq_cp0_init();
372 TX4927_IRQ_DPRINTK(TX4927_IRQ_INIT, "=Calling tx4927_irq_pic_init()\n");
373 tx4927_irq_pic_init();
375 TX4927_IRQ_DPRINTK(TX4927_IRQ_INIT, "+\n");
378 static int tx4927_irq_nested(void)
383 TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST1, "-\n");
385 level2 = TX4927_RD(0xff1ff6a0);
386 TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST2, "=level2a=0x%x\n", level2);
388 if ((level2 & 0x10000) == 0) {
390 TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST3, "=level2b=0x%x\n", level2);
392 sw_irq = TX4927_IRQ_PIC_BEG + level2;
393 TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST3, "=sw_irq=%d\n", sw_irq);
396 TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST4, "=irq-%d\n",
399 #ifdef CONFIG_TOSHIBA_RBTX4927
401 sw_irq = toshiba_rbtx4927_irq_nested(sw_irq);
405 TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST4, "=irq+%d\n",
410 TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST2, "=sw_irq=%d\n", sw_irq);
412 TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST1, "+\n");
417 asmlinkage void plat_irq_dispatch(void)
419 unsigned int pending = read_c0_status() & read_c0_cause();
421 if (pending & STATUSF_IP7) /* cpu timer */
422 do_IRQ(TX4927_IRQ_CPU_TIMER);
423 else if (pending & STATUSF_IP2) { /* tx4927 pic */
424 unsigned int irq = tx4927_irq_nested();
426 if (unlikely(irq == 0)) {
427 spurious_interrupt();
431 } else if (pending & STATUSF_IP0) /* user line 0 */
432 do_IRQ(TX4927_IRQ_USER0);
433 else if (pending & STATUSF_IP1) /* user line 1 */
434 do_IRQ(TX4927_IRQ_USER1);
436 spurious_interrupt();