2 * Copyright 2001 MontaVista Software Inc.
3 * Author: MontaVista Software, Inc.
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
10 * Copyright (C) 2000-2001 Toshiba Corporation
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation; either version 2 of the License, or (at your
15 * option) any later version.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
20 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
24 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 * You should have received a copy of the GNU General Public License along
29 * with this program; if not, write to the Free Software Foundation, Inc.,
30 * 675 Mass Ave, Cambridge, MA 02139, USA.
32 #include <linux/init.h>
34 #include <linux/errno.h>
35 #include <linux/irq.h>
36 #include <linux/kernel_stat.h>
37 #include <linux/signal.h>
38 #include <linux/sched.h>
39 #include <linux/types.h>
40 #include <linux/interrupt.h>
41 #include <linux/ioport.h>
42 #include <linux/timex.h>
43 #include <linux/slab.h>
44 #include <linux/random.h>
45 #include <linux/smp.h>
46 #include <linux/smp_lock.h>
47 #include <linux/bitops.h>
49 #include <asm/irq_regs.h>
51 #include <asm/mipsregs.h>
52 #include <asm/system.h>
54 #include <asm/ptrace.h>
55 #include <asm/processor.h>
56 #include <asm/jmr3927/irq.h>
57 #include <asm/debug.h>
58 #include <asm/jmr3927/jmr3927.h>
60 #if JMR3927_IRQ_END > NR_IRQS
61 #error JMR3927_IRQ_END > NR_IRQS
64 struct tb_irq_space* tb_irq_spaces;
66 static int jmr3927_irq_base = -1;
69 static int jmr3927_gen_iack(void)
71 /* generate ACK cycle */
73 return (tx3927_pcicptr->iiadp >> 24) & 0xff;
75 return tx3927_pcicptr->iiadp & 0xff;
83 static unsigned char irc_level[TX3927_NUM_IR] = {
84 5, 5, 5, 5, 5, 5, /* INT[5:0] */
86 5, 5, 5, 0, 0, /* DMA, PIO, PCI */
90 static void jmr3927_irq_disable(unsigned int irq_nr);
91 static void jmr3927_irq_enable(unsigned int irq_nr);
93 static DEFINE_SPINLOCK(jmr3927_irq_lock);
95 static unsigned int jmr3927_irq_startup(unsigned int irq)
97 jmr3927_irq_enable(irq);
102 #define jmr3927_irq_shutdown jmr3927_irq_disable
104 static void jmr3927_irq_ack(unsigned int irq)
106 if (irq == JMR3927_IRQ_IRC_TMR0)
107 jmr3927_tmrptr->tisr = 0; /* ack interrupt */
109 jmr3927_irq_disable(irq);
112 static void jmr3927_irq_end(unsigned int irq)
114 if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
115 jmr3927_irq_enable(irq);
118 static void jmr3927_irq_disable(unsigned int irq_nr)
120 struct tb_irq_space* sp;
123 spin_lock_irqsave(&jmr3927_irq_lock, flags);
124 for (sp = tb_irq_spaces; sp; sp = sp->next) {
125 if (sp->start_irqno <= irq_nr &&
126 irq_nr < sp->start_irqno + sp->nr_irqs) {
128 sp->mask_func(irq_nr - sp->start_irqno,
133 spin_unlock_irqrestore(&jmr3927_irq_lock, flags);
136 static void jmr3927_irq_enable(unsigned int irq_nr)
138 struct tb_irq_space* sp;
141 spin_lock_irqsave(&jmr3927_irq_lock, flags);
142 for (sp = tb_irq_spaces; sp; sp = sp->next) {
143 if (sp->start_irqno <= irq_nr &&
144 irq_nr < sp->start_irqno + sp->nr_irqs) {
146 sp->unmask_func(irq_nr - sp->start_irqno,
151 spin_unlock_irqrestore(&jmr3927_irq_lock, flags);
155 * CP0_STATUS is a thread's resource (saved/restored on context switch).
156 * So disable_irq/enable_irq MUST handle IOC/ISAC/IRC registers.
158 static void mask_irq_isac(int irq_nr, int space_id)
161 unsigned char imask =
162 jmr3927_isac_reg_in(JMR3927_ISAC_INTM_ADDR);
163 unsigned int bit = 1 << irq_nr;
164 jmr3927_isac_reg_out(imask & ~bit, JMR3927_ISAC_INTM_ADDR);
165 /* flush write buffer */
166 (void)jmr3927_ioc_reg_in(JMR3927_IOC_REV_ADDR);
168 static void unmask_irq_isac(int irq_nr, int space_id)
171 unsigned char imask = jmr3927_isac_reg_in(JMR3927_ISAC_INTM_ADDR);
172 unsigned int bit = 1 << irq_nr;
173 jmr3927_isac_reg_out(imask | bit, JMR3927_ISAC_INTM_ADDR);
174 /* flush write buffer */
175 (void)jmr3927_ioc_reg_in(JMR3927_IOC_REV_ADDR);
178 static void mask_irq_ioc(int irq_nr, int space_id)
181 unsigned char imask = jmr3927_ioc_reg_in(JMR3927_IOC_INTM_ADDR);
182 unsigned int bit = 1 << irq_nr;
183 jmr3927_ioc_reg_out(imask & ~bit, JMR3927_IOC_INTM_ADDR);
184 /* flush write buffer */
185 (void)jmr3927_ioc_reg_in(JMR3927_IOC_REV_ADDR);
187 static void unmask_irq_ioc(int irq_nr, int space_id)
190 unsigned char imask = jmr3927_ioc_reg_in(JMR3927_IOC_INTM_ADDR);
191 unsigned int bit = 1 << irq_nr;
192 jmr3927_ioc_reg_out(imask | bit, JMR3927_IOC_INTM_ADDR);
193 /* flush write buffer */
194 (void)jmr3927_ioc_reg_in(JMR3927_IOC_REV_ADDR);
197 static void mask_irq_irc(int irq_nr, int space_id)
199 volatile unsigned long *ilrp = &tx3927_ircptr->ilr[irq_nr / 2];
201 *ilrp = (*ilrp & 0x00ff) | (irc_dlevel << 8);
203 *ilrp = (*ilrp & 0xff00) | irc_dlevel;
205 tx3927_ircptr->imr = 0;
206 tx3927_ircptr->imr = irc_elevel;
207 /* flush write buffer */
208 (void)tx3927_ircptr->ssr;
211 static void unmask_irq_irc(int irq_nr, int space_id)
213 volatile unsigned long *ilrp = &tx3927_ircptr->ilr[irq_nr / 2];
215 *ilrp = (*ilrp & 0x00ff) | (irc_level[irq_nr] << 8);
217 *ilrp = (*ilrp & 0xff00) | irc_level[irq_nr];
219 tx3927_ircptr->imr = 0;
220 tx3927_ircptr->imr = irc_elevel;
223 struct tb_irq_space jmr3927_isac_irqspace = {
225 .start_irqno = JMR3927_IRQ_ISAC,
226 nr_irqs : JMR3927_NR_IRQ_ISAC,
227 .mask_func = mask_irq_isac,
228 .unmask_func = unmask_irq_isac,
233 struct tb_irq_space jmr3927_ioc_irqspace = {
235 .start_irqno = JMR3927_IRQ_IOC,
236 nr_irqs : JMR3927_NR_IRQ_IOC,
237 .mask_func = mask_irq_ioc,
238 .unmask_func = unmask_irq_ioc,
244 struct tb_irq_space jmr3927_irc_irqspace = {
246 .start_irqno = JMR3927_IRQ_IRC,
247 .nr_irqs = JMR3927_NR_IRQ_IRC,
248 .mask_func = mask_irq_irc,
249 .unmask_func = unmask_irq_irc,
256 #ifdef CONFIG_TX_BRANCH_LIKELY_BUG_WORKAROUND
257 static int tx_branch_likely_bug_count = 0;
258 static int have_tx_branch_likely_bug = 0;
260 static void tx_branch_likely_bug_fixup(void)
262 struct pt_regs *regs = get_irq_regs();
264 /* TX39/49-BUG: Under this condition, the insn in delay slot
265 of the branch likely insn is executed (not nullified) even
266 the branch condition is false. */
267 if (!have_tx_branch_likely_bug)
269 if ((regs->cp0_epc & 0xfff) == 0xffc &&
270 KSEGX(regs->cp0_epc) != KSEG0 &&
271 KSEGX(regs->cp0_epc) != KSEG1) {
272 unsigned int insn = *(unsigned int*)(regs->cp0_epc - 4);
273 /* beql,bnel,blezl,bgtzl */
274 /* bltzl,bgezl,blezall,bgezall */
276 if ((insn & 0xf0000000) == 0x50000000 ||
277 (insn & 0xfc0e0000) == 0x04020000 ||
278 (insn & 0xf3fe0000) == 0x41020000) {
280 tx_branch_likely_bug_count++;
282 "fix branch-likery bug in %s (insn %08x)\n",
283 current->comm, insn);
289 static void jmr3927_spurious(void)
291 struct pt_regs * regs = get_irq_regs();
293 #ifdef CONFIG_TX_BRANCH_LIKELY_BUG_WORKAROUND
294 tx_branch_likely_bug_fixup();
296 printk(KERN_WARNING "spurious interrupt (cause 0x%lx, pc 0x%lx, ra 0x%lx).\n",
297 regs->cp0_cause, regs->cp0_epc, regs->regs[31]);
300 asmlinkage void plat_irq_dispatch(void)
302 struct pt_regs * regs = get_irq_regs();
305 #ifdef CONFIG_TX_BRANCH_LIKELY_BUG_WORKAROUND
306 tx_branch_likely_bug_fixup();
308 if ((regs->cp0_cause & CAUSEF_IP7) == 0) {
314 irq = (regs->cp0_cause >> CAUSEB_IP2) & 0x0f;
316 do_IRQ(irq + JMR3927_IRQ_IRC);
319 static irqreturn_t jmr3927_ioc_interrupt(int irq, void *dev_id)
321 unsigned char istat = jmr3927_ioc_reg_in(JMR3927_IOC_INTS2_ADDR);
324 for (i = 0; i < JMR3927_NR_IRQ_IOC; i++) {
325 if (istat & (1 << i)) {
326 irq = JMR3927_IRQ_IOC + i;
333 static struct irqaction ioc_action = {
334 jmr3927_ioc_interrupt, 0, CPU_MASK_NONE, "IOC", NULL, NULL,
337 static irqreturn_t jmr3927_isac_interrupt(int irq, void *dev_id)
339 unsigned char istat = jmr3927_isac_reg_in(JMR3927_ISAC_INTS2_ADDR);
342 for (i = 0; i < JMR3927_NR_IRQ_ISAC; i++) {
343 if (istat & (1 << i)) {
344 irq = JMR3927_IRQ_ISAC + i;
351 static struct irqaction isac_action = {
352 jmr3927_isac_interrupt, 0, CPU_MASK_NONE, "ISAC", NULL, NULL,
356 static irqreturn_t jmr3927_isaerr_interrupt(int irq, void *dev_id)
358 printk(KERN_WARNING "ISA error interrupt (irq 0x%x).\n", irq);
362 static struct irqaction isaerr_action = {
363 jmr3927_isaerr_interrupt, 0, CPU_MASK_NONE, "ISA error", NULL, NULL,
366 static irqreturn_t jmr3927_pcierr_interrupt(int irq, void *dev_id)
368 printk(KERN_WARNING "PCI error interrupt (irq 0x%x).\n", irq);
369 printk(KERN_WARNING "pcistat:%02x, lbstat:%04lx\n",
370 tx3927_pcicptr->pcistat, tx3927_pcicptr->lbstat);
374 static struct irqaction pcierr_action = {
375 jmr3927_pcierr_interrupt, 0, CPU_MASK_NONE, "PCI error", NULL, NULL,
378 int jmr3927_ether1_irq = 0;
380 void jmr3927_irq_init(u32 irq_base);
382 void __init arch_init_irq(void)
384 /* look for io board's presence */
385 int have_isac = jmr3927_have_isac();
387 /* Now, interrupt control disabled, */
388 /* all IRC interrupts are masked, */
389 /* all IRC interrupt mode are Low Active. */
393 /* ETHER1 (NE2000 compatible 10M-Ether) parameter setup */
394 /* temporary enable interrupt control */
395 tx3927_ircptr->cer = 1;
396 /* ETHER1 Int. Is High-Active. */
397 if (tx3927_ircptr->ssr & (1 << 0))
398 jmr3927_ether1_irq = JMR3927_IRQ_IRC_INT0;
399 #if 0 /* INT3 may be asserted by ether0 (even after reboot...) */
400 else if (tx3927_ircptr->ssr & (1 << 3))
401 jmr3927_ether1_irq = JMR3927_IRQ_IRC_INT3;
403 /* disable interrupt control */
404 tx3927_ircptr->cer = 0;
406 /* Ether1: High Active */
407 if (jmr3927_ether1_irq) {
408 int ether1_irc = jmr3927_ether1_irq - JMR3927_IRQ_IRC;
409 tx3927_ircptr->cr[ether1_irc / 8] |=
410 TX3927_IRCR_HIGH << ((ether1_irc % 8) * 2);
414 /* mask all IOC interrupts */
415 jmr3927_ioc_reg_out(0, JMR3927_IOC_INTM_ADDR);
416 /* setup IOC interrupt mode (SOFT:High Active, Others:Low Active) */
417 jmr3927_ioc_reg_out(JMR3927_IOC_INTF_SOFT, JMR3927_IOC_INTP_ADDR);
420 /* mask all ISAC interrupts */
421 jmr3927_isac_reg_out(0, JMR3927_ISAC_INTM_ADDR);
422 /* setup ISAC interrupt mode (ISAIRQ3,ISAIRQ5:Low Active ???) */
423 jmr3927_isac_reg_out(JMR3927_ISAC_INTF_IRQ3|JMR3927_ISAC_INTF_IRQ5, JMR3927_ISAC_INTP_ADDR);
426 /* clear PCI Soft interrupts */
427 jmr3927_ioc_reg_out(0, JMR3927_IOC_INTS1_ADDR);
428 /* clear PCI Reset interrupts */
429 jmr3927_ioc_reg_out(0, JMR3927_IOC_RESET_ADDR);
431 /* enable interrupt control */
432 tx3927_ircptr->cer = TX3927_IRCER_ICE;
433 tx3927_ircptr->imr = irc_elevel;
435 jmr3927_irq_init(NR_ISA_IRQS);
437 /* setup irq space */
438 add_tb_irq_space(&jmr3927_isac_irqspace);
439 add_tb_irq_space(&jmr3927_ioc_irqspace);
440 add_tb_irq_space(&jmr3927_irc_irqspace);
442 /* setup IOC interrupt 1 (PCI, MODEM) */
443 setup_irq(JMR3927_IRQ_IOCINT, &ioc_action);
446 setup_irq(JMR3927_IRQ_ISACINT, &isac_action);
447 setup_irq(JMR3927_IRQ_ISAC_ISAER, &isaerr_action);
451 setup_irq(JMR3927_IRQ_IRC_PCI, &pcierr_action);
454 /* enable all CPU interrupt bits. */
455 set_c0_status(ST0_IM); /* IE bit is still 0. */
458 static struct irq_chip jmr3927_irq_controller = {
459 .typename = "jmr3927_irq",
460 .startup = jmr3927_irq_startup,
461 .shutdown = jmr3927_irq_shutdown,
462 .enable = jmr3927_irq_enable,
463 .disable = jmr3927_irq_disable,
464 .ack = jmr3927_irq_ack,
465 .end = jmr3927_irq_end,
468 void jmr3927_irq_init(u32 irq_base)
472 for (i= irq_base; i< irq_base + JMR3927_NR_IRQ_IRC + JMR3927_NR_IRQ_IOC; i++) {
473 irq_desc[i].status = IRQ_DISABLED;
474 irq_desc[i].action = NULL;
475 irq_desc[i].depth = 1;
476 irq_desc[i].chip = &jmr3927_irq_controller;
479 jmr3927_irq_base = irq_base;