2 * File: arch/blackfin/mach-common/ints-priority-dc.c
7 * Description: Set up the interrupt priorities
11 * 1999 D. Jeff Dionne <jeff@uclinux.org>
12 * 2000-2001 Lineo, Inc. D. Jefff Dionne <jeff@lineo.ca>
13 * 2002 Arcturus Networks Inc. MaTed <mated@sympatico.ca>
14 * 2003 Metrowerks/Motorola
15 * 2003 Bas Vermeulen <bas@buyways.nl>
16 * Copyright 2004-2006 Analog Devices Inc.
18 * Bugs: Enter bugs at http://blackfin.uclinux.org/
20 * This program is free software; you can redistribute it and/or modify
21 * it under the terms of the GNU General Public License as published by
22 * the Free Software Foundation; either version 2 of the License, or
23 * (at your option) any later version.
25 * This program is distributed in the hope that it will be useful,
26 * but WITHOUT ANY WARRANTY; without even the implied warranty of
27 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
28 * GNU General Public License for more details.
30 * You should have received a copy of the GNU General Public License
31 * along with this program; if not, see the file COPYING, or write
32 * to the Free Software Foundation, Inc.,
33 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
36 #include <linux/module.h>
37 #include <linux/kernel_stat.h>
38 #include <linux/seq_file.h>
39 #include <linux/irq.h>
41 #include <linux/kgdb.h>
43 #include <asm/traps.h>
44 #include <asm/blackfin.h>
46 #include <asm/irq_handler.h>
50 * - we have separated the physical Hardware interrupt from the
51 * levels that the LINUX kernel sees (see the description in irq.h)
55 unsigned long irq_flags = 0;
57 /* The number of spurious interrupts */
58 atomic_t num_spurious;
61 /* irq number for request_irq, available in mach-bf561/irq.h */
63 /* corresponding bit in the SICA_ISR0 register */
65 /* corresponding bit in the SICA_ISR1 register */
67 } ivg_table[NR_PERI_INTS];
70 /* position of first irq in ivg_table for given ivg */
73 } ivg7_13[IVG13 - IVG7 + 1];
75 static void search_IAR(void);
78 * Search SIC_IAR and fill tables with the irqvalues
79 * and their positions in the SIC_ISR register.
81 static void __init search_IAR(void)
83 unsigned ivg, irq_pos = 0;
84 for (ivg = 0; ivg <= IVG13 - IVG7; ivg++) {
87 ivg7_13[ivg].istop = ivg7_13[ivg].ifirst = &ivg_table[irq_pos];
89 for (irqn = 0; irqn < NR_PERI_INTS; irqn++) {
90 int iar_shift = (irqn & 7) * 4;
93 bfin_read32((unsigned long *)SICA_IAR0 +
94 (irqn >> 3)) >> iar_shift)) {
95 ivg_table[irq_pos].irqno = IVG7 + irqn;
96 ivg_table[irq_pos].isrflag0 =
97 (irqn < 32 ? (1 << irqn) : 0);
98 ivg_table[irq_pos].isrflag1 =
99 (irqn < 32 ? 0 : (1 << (irqn - 32)));
100 ivg7_13[ivg].istop++;
108 * This is for BF561 internal IRQs
111 static void ack_noop(unsigned int irq)
113 /* Dummy function. */
116 static void bf561_core_mask_irq(unsigned int irq)
118 irq_flags &= ~(1 << irq);
119 if (!irqs_disabled())
123 static void bf561_core_unmask_irq(unsigned int irq)
125 irq_flags |= 1 << irq;
127 * If interrupts are enabled, IMASK must contain the same value
128 * as irq_flags. Make sure that invariant holds. If interrupts
129 * are currently disabled we need not do anything; one of the
130 * callers will take care of setting IMASK to the proper value
131 * when reenabling interrupts.
132 * local_irq_enable just does "STI irq_flags", so it's exactly
135 if (!irqs_disabled())
140 static void bf561_internal_mask_irq(unsigned int irq)
142 unsigned long irq_mask;
143 if ((irq - (IRQ_CORETMR + 1)) < 32) {
144 irq_mask = (1 << (irq - (IRQ_CORETMR + 1)));
145 bfin_write_SICA_IMASK0(bfin_read_SICA_IMASK0() & ~irq_mask);
147 irq_mask = (1 << (irq - (IRQ_CORETMR + 1) - 32));
148 bfin_write_SICA_IMASK1(bfin_read_SICA_IMASK1() & ~irq_mask);
152 static void bf561_internal_unmask_irq(unsigned int irq)
154 unsigned long irq_mask;
156 if ((irq - (IRQ_CORETMR + 1)) < 32) {
157 irq_mask = (1 << (irq - (IRQ_CORETMR + 1)));
158 bfin_write_SICA_IMASK0(bfin_read_SICA_IMASK0() | irq_mask);
160 irq_mask = (1 << (irq - (IRQ_CORETMR + 1) - 32));
161 bfin_write_SICA_IMASK1(bfin_read_SICA_IMASK1() | irq_mask);
166 static struct irq_chip bf561_core_irqchip = {
168 .mask = bf561_core_mask_irq,
169 .unmask = bf561_core_unmask_irq,
172 static struct irq_chip bf561_internal_irqchip = {
174 .mask = bf561_internal_mask_irq,
175 .unmask = bf561_internal_unmask_irq,
178 #ifdef CONFIG_IRQCHIP_DEMUX_GPIO
179 static unsigned short gpio_enabled[gpio_bank(MAX_BLACKFIN_GPIOS)];
180 static unsigned short gpio_edge_triggered[gpio_bank(MAX_BLACKFIN_GPIOS)];
182 static void bf561_gpio_ack_irq(unsigned int irq)
184 u16 gpionr = irq - IRQ_PF0;
186 if (gpio_edge_triggered[gpio_bank(gpionr)] & gpio_bit(gpionr)) {
187 set_gpio_data(gpionr, 0);
192 static void bf561_gpio_mask_ack_irq(unsigned int irq)
194 u16 gpionr = irq - IRQ_PF0;
196 if (gpio_edge_triggered[gpio_bank(gpionr)] & gpio_bit(gpionr)) {
197 set_gpio_data(gpionr, 0);
201 set_gpio_maska(gpionr, 0);
205 static void bf561_gpio_mask_irq(unsigned int irq)
207 set_gpio_maska(irq - IRQ_PF0, 0);
211 static void bf561_gpio_unmask_irq(unsigned int irq)
213 set_gpio_maska(irq - IRQ_PF0, 1);
217 static unsigned int bf561_gpio_irq_startup(unsigned int irq)
220 u16 gpionr = irq - IRQ_PF0;
222 if (!(gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))) {
224 ret = gpio_request(gpionr, "IRQ");
230 gpio_enabled[gpio_bank(gpionr)] |= gpio_bit(gpionr);
231 bf561_gpio_unmask_irq(irq);
237 static void bf561_gpio_irq_shutdown(unsigned int irq)
239 bf561_gpio_mask_irq(irq);
240 gpio_free(irq - IRQ_PF0);
241 gpio_enabled[gpio_bank(irq - IRQ_PF0)] &= ~gpio_bit(irq - IRQ_PF0);
244 static int bf561_gpio_irq_type(unsigned int irq, unsigned int type)
248 u16 gpionr = irq - IRQ_PF0;
251 if (type == IRQ_TYPE_PROBE) {
252 /* only probe unenabled GPIO interrupt lines */
253 if (gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))
255 type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
259 if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
260 IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
262 if (!(gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))) {
264 ret = gpio_request(gpionr, "IRQ");
270 gpio_enabled[gpio_bank(gpionr)] |= gpio_bit(gpionr);
272 gpio_enabled[gpio_bank(gpionr)] &= ~gpio_bit(gpionr);
277 set_gpio_dir(gpionr, 0);
278 set_gpio_inen(gpionr, 1);
281 if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
282 gpio_edge_triggered[gpio_bank(gpionr)] |= gpio_bit(gpionr);
283 set_gpio_edge(gpionr, 1);
285 set_gpio_edge(gpionr, 0);
286 gpio_edge_triggered[gpio_bank(gpionr)] &= ~gpio_bit(gpionr);
289 if ((type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
290 == (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
291 set_gpio_both(gpionr, 1);
293 set_gpio_both(gpionr, 0);
295 if ((type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW)))
296 set_gpio_polar(gpionr, 1); /* low or falling edge denoted by one */
298 set_gpio_polar(gpionr, 0); /* high or rising edge denoted by zero */
302 if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
303 set_irq_handler(irq, handle_edge_irq);
305 set_irq_handler(irq, handle_level_irq);
310 static struct irq_chip bf561_gpio_irqchip = {
311 .ack = bf561_gpio_ack_irq,
312 .mask = bf561_gpio_mask_irq,
313 .mask_ack = bf561_gpio_mask_ack_irq,
314 .unmask = bf561_gpio_unmask_irq,
315 .set_type = bf561_gpio_irq_type,
316 .startup = bf561_gpio_irq_startup,
317 .shutdown = bf561_gpio_irq_shutdown
320 static void bf561_demux_gpio_irq(unsigned int inta_irq,
321 struct irq_desc *intb_desc)
323 int irq, flag_d, mask;
341 gpio = irq - IRQ_PF0;
343 flag_d = get_gpiop_data(gpio);
344 mask = flag_d & (gpio_enabled[gpio_bank(gpio)] &
345 get_gpiop_maska(gpio));
349 struct irq_desc *desc = irq_desc + irq;
350 desc->handle_irq(irq, desc);
359 #endif /* CONFIG_IRQCHIP_DEMUX_GPIO */
361 void __init init_exception_vectors(void)
365 /* cannot program in software:
366 * evt0 - emulation (jtag)
369 bfin_write_EVT2(evt_nmi);
370 bfin_write_EVT3(trap);
371 bfin_write_EVT5(evt_ivhw);
372 bfin_write_EVT6(evt_timer);
373 bfin_write_EVT7(evt_evt7);
374 bfin_write_EVT8(evt_evt8);
375 bfin_write_EVT9(evt_evt9);
376 bfin_write_EVT10(evt_evt10);
377 bfin_write_EVT11(evt_evt11);
378 bfin_write_EVT12(evt_evt12);
379 bfin_write_EVT13(evt_evt13);
380 bfin_write_EVT14(evt14_softirq);
381 bfin_write_EVT15(evt_system_call);
386 * This function should be called during kernel startup to initialize
387 * the BFin IRQ handling routines.
389 int __init init_arch_irq(void)
392 unsigned long ilat = 0;
393 /* Disable all the peripheral intrs - page 4-29 HW Ref manual */
394 bfin_write_SICA_IMASK0(SIC_UNMASK_ALL);
395 bfin_write_SICA_IMASK1(SIC_UNMASK_ALL);
398 bfin_write_SICA_IWR0(IWR_ENABLE_ALL);
399 bfin_write_SICA_IWR1(IWR_ENABLE_ALL);
403 init_exception_buff();
405 for (irq = 0; irq <= SYS_IRQS; irq++) {
406 if (irq <= IRQ_CORETMR)
407 set_irq_chip(irq, &bf561_core_irqchip);
409 set_irq_chip(irq, &bf561_internal_irqchip);
410 #ifdef CONFIG_IRQCHIP_DEMUX_GPIO
411 if ((irq != IRQ_PROG0_INTA) &&
412 (irq != IRQ_PROG1_INTA) && (irq != IRQ_PROG2_INTA)) {
414 set_irq_handler(irq, handle_simple_irq);
415 #ifdef CONFIG_IRQCHIP_DEMUX_GPIO
417 set_irq_chained_handler(irq, bf561_demux_gpio_irq);
423 #ifdef CONFIG_IRQCHIP_DEMUX_GPIO
424 for (irq = IRQ_PF0; irq <= IRQ_PF47; irq++) {
425 set_irq_chip(irq, &bf561_gpio_irqchip);
426 /* if configured as edge, then will be changed to do_edge_IRQ */
427 set_irq_handler(irq, handle_level_irq);
432 ilat = bfin_read_ILAT();
434 bfin_write_ILAT(ilat);
437 printk(KERN_INFO "Configuring Blackfin Priority Driven Interrupts\n");
438 /* IMASK=xxx is equivalent to STI xx or irq_flags=xx,
442 /* Therefore it's better to setup IARs before interrupts enabled */
445 /* Enable interrupts IVG7-15 */
446 irq_flags = irq_flags | IMASK_IVG15 |
447 IMASK_IVG14 | IMASK_IVG13 | IMASK_IVG12 | IMASK_IVG11 |
448 IMASK_IVG10 | IMASK_IVG9 | IMASK_IVG8 | IMASK_IVG7 | IMASK_IVGHW;
453 #ifdef CONFIG_DO_IRQ_L1
454 void do_irq(int vec, struct pt_regs *fp)__attribute__((l1_text));
457 void do_irq(int vec, struct pt_regs *fp)
459 if (vec == EVT_IVTMR_P) {
462 struct ivgx *ivg = ivg7_13[vec - IVG7].ifirst;
463 struct ivgx *ivg_stop = ivg7_13[vec - IVG7].istop;
464 unsigned long sic_status0, sic_status1;
467 sic_status0 = bfin_read_SICA_IMASK0() & bfin_read_SICA_ISR0();
468 sic_status1 = bfin_read_SICA_IMASK1() & bfin_read_SICA_ISR1();
471 if (ivg >= ivg_stop) {
472 atomic_inc(&num_spurious);
474 } else if ((sic_status0 & ivg->isrflag0) ||
475 (sic_status1 & ivg->isrflag1))
483 kgdb_process_breakpoint();