2 * arch/powerpc/sysdev/qe_lib/qe_ic.c
4 * Copyright (C) 2006 Freescale Semiconductor, Inc. All rights reserved.
6 * Author: Li Yang <leoli@freescale.com>
7 * Based on code from Shlomi Gridish <gridish@freescale.com>
9 * QUICC ENGINE Interrupt Controller
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2 of the License, or (at your
14 * option) any later version.
17 #include <linux/kernel.h>
18 #include <linux/init.h>
19 #include <linux/errno.h>
20 #include <linux/reboot.h>
21 #include <linux/slab.h>
22 #include <linux/stddef.h>
23 #include <linux/sched.h>
24 #include <linux/signal.h>
25 #include <linux/device.h>
26 #include <linux/spinlock.h>
30 #include <asm/qe_ic.h>
34 static DEFINE_RAW_SPINLOCK(qe_ic_lock);
36 static struct qe_ic_info qe_ic_info[] = {
39 .mask_reg = QEIC_CIMR,
41 .pri_reg = QEIC_CIPWCC,
45 .mask_reg = QEIC_CIMR,
47 .pri_reg = QEIC_CIPWCC,
51 .mask_reg = QEIC_CIMR,
53 .pri_reg = QEIC_CIPWCC,
57 .mask_reg = QEIC_CIMR,
59 .pri_reg = QEIC_CIPZCC,
63 .mask_reg = QEIC_CIMR,
65 .pri_reg = QEIC_CIPZCC,
69 .mask_reg = QEIC_CIMR,
71 .pri_reg = QEIC_CIPZCC,
75 .mask_reg = QEIC_CIMR,
77 .pri_reg = QEIC_CIPZCC,
81 .mask_reg = QEIC_CIMR,
83 .pri_reg = QEIC_CIPZCC,
87 .mask_reg = QEIC_CIMR,
89 .pri_reg = QEIC_CIPZCC,
93 .mask_reg = QEIC_CRIMR,
95 .pri_reg = QEIC_CIPRTA,
99 .mask_reg = QEIC_CRIMR,
101 .pri_reg = QEIC_CIPRTB,
105 .mask_reg = QEIC_CRIMR,
107 .pri_reg = QEIC_CIPRTB,
111 .mask_reg = QEIC_CRIMR,
113 .pri_reg = QEIC_CIPRTB,
117 .mask_reg = QEIC_CRIMR,
119 .pri_reg = QEIC_CIPRTB,
123 .mask_reg = QEIC_CIMR,
125 .pri_reg = QEIC_CIPXCC,
129 .mask_reg = QEIC_CIMR,
131 .pri_reg = QEIC_CIPXCC,
135 .mask_reg = QEIC_CIMR,
137 .pri_reg = QEIC_CIPXCC,
141 .mask_reg = QEIC_CIMR,
143 .pri_reg = QEIC_CIPXCC,
147 .mask_reg = QEIC_CIMR,
149 .pri_reg = QEIC_CIPXCC,
153 .mask_reg = QEIC_CIMR,
155 .pri_reg = QEIC_CIPYCC,
159 .mask_reg = QEIC_CIMR,
161 .pri_reg = QEIC_CIPYCC,
165 .mask_reg = QEIC_CIMR,
167 .pri_reg = QEIC_CIPYCC,
171 .mask_reg = QEIC_CIMR,
173 .pri_reg = QEIC_CIPYCC,
177 static inline u32 qe_ic_read(volatile __be32 __iomem * base, unsigned int reg)
179 return in_be32(base + (reg >> 2));
182 static inline void qe_ic_write(volatile __be32 __iomem * base, unsigned int reg,
185 out_be32(base + (reg >> 2), value);
188 static inline struct qe_ic *qe_ic_from_irq(unsigned int virq)
190 return irq_get_chip_data(virq);
193 static inline struct qe_ic *qe_ic_from_irq_data(struct irq_data *d)
195 return irq_data_get_irq_chip_data(d);
198 static void qe_ic_unmask_irq(struct irq_data *d)
200 struct qe_ic *qe_ic = qe_ic_from_irq_data(d);
201 unsigned int src = irqd_to_hwirq(d);
205 raw_spin_lock_irqsave(&qe_ic_lock, flags);
207 temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].mask_reg);
208 qe_ic_write(qe_ic->regs, qe_ic_info[src].mask_reg,
209 temp | qe_ic_info[src].mask);
211 raw_spin_unlock_irqrestore(&qe_ic_lock, flags);
214 static void qe_ic_mask_irq(struct irq_data *d)
216 struct qe_ic *qe_ic = qe_ic_from_irq_data(d);
217 unsigned int src = irqd_to_hwirq(d);
221 raw_spin_lock_irqsave(&qe_ic_lock, flags);
223 temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].mask_reg);
224 qe_ic_write(qe_ic->regs, qe_ic_info[src].mask_reg,
225 temp & ~qe_ic_info[src].mask);
227 /* Flush the above write before enabling interrupts; otherwise,
228 * spurious interrupts will sometimes happen. To be 100% sure
229 * that the write has reached the device before interrupts are
230 * enabled, the mask register would have to be read back; however,
231 * this is not required for correctness, only to avoid wasting
232 * time on a large number of spurious interrupts. In testing,
233 * a sync reduced the observed spurious interrupts to zero.
237 raw_spin_unlock_irqrestore(&qe_ic_lock, flags);
240 static struct irq_chip qe_ic_irq_chip = {
242 .irq_unmask = qe_ic_unmask_irq,
243 .irq_mask = qe_ic_mask_irq,
244 .irq_mask_ack = qe_ic_mask_irq,
247 static int qe_ic_host_match(struct irq_domain *h, struct device_node *node,
248 enum irq_domain_bus_token bus_token)
250 /* Exact match, unless qe_ic node is NULL */
251 return h->of_node == NULL || h->of_node == node;
254 static int qe_ic_host_map(struct irq_domain *h, unsigned int virq,
257 struct qe_ic *qe_ic = h->host_data;
258 struct irq_chip *chip;
260 if (qe_ic_info[hw].mask == 0) {
261 printk(KERN_ERR "Can't map reserved IRQ\n");
265 chip = &qe_ic->hc_irq;
267 irq_set_chip_data(virq, qe_ic);
268 irq_set_status_flags(virq, IRQ_LEVEL);
270 irq_set_chip_and_handler(virq, chip, handle_level_irq);
275 static const struct irq_domain_ops qe_ic_host_ops = {
276 .match = qe_ic_host_match,
277 .map = qe_ic_host_map,
278 .xlate = irq_domain_xlate_onetwocell,
281 /* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
282 unsigned int qe_ic_get_low_irq(struct qe_ic *qe_ic)
286 BUG_ON(qe_ic == NULL);
288 /* get the interrupt source vector. */
289 irq = qe_ic_read(qe_ic->regs, QEIC_CIVEC) >> 26;
294 return irq_linear_revmap(qe_ic->irqhost, irq);
297 /* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
298 unsigned int qe_ic_get_high_irq(struct qe_ic *qe_ic)
302 BUG_ON(qe_ic == NULL);
304 /* get the interrupt source vector. */
305 irq = qe_ic_read(qe_ic->regs, QEIC_CHIVEC) >> 26;
310 return irq_linear_revmap(qe_ic->irqhost, irq);
313 void __init qe_ic_init(struct device_node *node, unsigned int flags,
314 void (*low_handler)(struct irq_desc *desc),
315 void (*high_handler)(struct irq_desc *desc))
319 u32 temp = 0, ret, high_active = 0;
321 ret = of_address_to_resource(node, 0, &res);
325 qe_ic = kzalloc(sizeof(*qe_ic), GFP_KERNEL);
329 qe_ic->irqhost = irq_domain_add_linear(node, NR_QE_IC_INTS,
330 &qe_ic_host_ops, qe_ic);
331 if (qe_ic->irqhost == NULL) {
336 qe_ic->regs = ioremap(res.start, resource_size(&res));
338 qe_ic->hc_irq = qe_ic_irq_chip;
340 qe_ic->virq_high = irq_of_parse_and_map(node, 0);
341 qe_ic->virq_low = irq_of_parse_and_map(node, 1);
343 if (qe_ic->virq_low == NO_IRQ) {
344 printk(KERN_ERR "Failed to map QE_IC low IRQ\n");
349 /* default priority scheme is grouped. If spread mode is */
350 /* required, configure cicr accordingly. */
351 if (flags & QE_IC_SPREADMODE_GRP_W)
353 if (flags & QE_IC_SPREADMODE_GRP_X)
355 if (flags & QE_IC_SPREADMODE_GRP_Y)
357 if (flags & QE_IC_SPREADMODE_GRP_Z)
359 if (flags & QE_IC_SPREADMODE_GRP_RISCA)
361 if (flags & QE_IC_SPREADMODE_GRP_RISCB)
364 /* choose destination signal for highest priority interrupt */
365 if (flags & QE_IC_HIGH_SIGNAL) {
366 temp |= (SIGNAL_HIGH << CICR_HPIT_SHIFT);
370 qe_ic_write(qe_ic->regs, QEIC_CICR, temp);
372 irq_set_handler_data(qe_ic->virq_low, qe_ic);
373 irq_set_chained_handler(qe_ic->virq_low, low_handler);
375 if (qe_ic->virq_high != NO_IRQ &&
376 qe_ic->virq_high != qe_ic->virq_low) {
377 irq_set_handler_data(qe_ic->virq_high, qe_ic);
378 irq_set_chained_handler(qe_ic->virq_high, high_handler);
382 void qe_ic_set_highest_priority(unsigned int virq, int high)
384 struct qe_ic *qe_ic = qe_ic_from_irq(virq);
385 unsigned int src = virq_to_hw(virq);
388 temp = qe_ic_read(qe_ic->regs, QEIC_CICR);
390 temp &= ~CICR_HP_MASK;
391 temp |= src << CICR_HP_SHIFT;
393 temp &= ~CICR_HPIT_MASK;
394 temp |= (high ? SIGNAL_HIGH : SIGNAL_LOW) << CICR_HPIT_SHIFT;
396 qe_ic_write(qe_ic->regs, QEIC_CICR, temp);
399 /* Set Priority level within its group, from 1 to 8 */
400 int qe_ic_set_priority(unsigned int virq, unsigned int priority)
402 struct qe_ic *qe_ic = qe_ic_from_irq(virq);
403 unsigned int src = virq_to_hw(virq);
406 if (priority > 8 || priority == 0)
410 if (qe_ic_info[src].pri_reg == 0)
413 temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].pri_reg);
416 temp &= ~(0x7 << (32 - priority * 3));
417 temp |= qe_ic_info[src].pri_code << (32 - priority * 3);
419 temp &= ~(0x7 << (24 - priority * 3));
420 temp |= qe_ic_info[src].pri_code << (24 - priority * 3);
423 qe_ic_write(qe_ic->regs, qe_ic_info[src].pri_reg, temp);
428 /* Set a QE priority to use high irq, only priority 1~2 can use high irq */
429 int qe_ic_set_high_priority(unsigned int virq, unsigned int priority, int high)
431 struct qe_ic *qe_ic = qe_ic_from_irq(virq);
432 unsigned int src = virq_to_hw(virq);
433 u32 temp, control_reg = QEIC_CICNR, shift = 0;
435 if (priority > 2 || priority == 0)
438 switch (qe_ic_info[src].pri_reg) {
440 shift = CICNR_ZCC1T_SHIFT;
443 shift = CICNR_WCC1T_SHIFT;
446 shift = CICNR_YCC1T_SHIFT;
449 shift = CICNR_XCC1T_SHIFT;
452 shift = CRICR_RTA1T_SHIFT;
453 control_reg = QEIC_CRICR;
456 shift = CRICR_RTB1T_SHIFT;
457 control_reg = QEIC_CRICR;
463 shift += (2 - priority) * 2;
464 temp = qe_ic_read(qe_ic->regs, control_reg);
465 temp &= ~(SIGNAL_MASK << shift);
466 temp |= (high ? SIGNAL_HIGH : SIGNAL_LOW) << shift;
467 qe_ic_write(qe_ic->regs, control_reg, temp);
472 static struct bus_type qe_ic_subsys = {
477 static struct device device_qe_ic = {
479 .bus = &qe_ic_subsys,
482 static int __init init_qe_ic_sysfs(void)
486 printk(KERN_DEBUG "Registering qe_ic with sysfs...\n");
488 rc = subsys_system_register(&qe_ic_subsys, NULL);
490 printk(KERN_ERR "Failed registering qe_ic sys class\n");
493 rc = device_register(&device_qe_ic);
495 printk(KERN_ERR "Failed registering qe_ic sys device\n");
501 subsys_initcall(init_qe_ic_sysfs);