2 * arch/ppc/kernel/mv64360_pic.c
4 * Interrupt controller support for Marvell's MV64360.
6 * Author: Rabeeh Khoury <rabeeh@galileo.co.il>
7 * Based on MV64360 PIC written by
8 * Chris Zankel <chris@mvista.com>
9 * Mark A. Greer <mgreer@mvista.com>
11 * Copyright 2004 MontaVista Software, Inc.
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the
15 * Free Software Foundation; either version 2 of the License, or (at your
16 * option) any later version.
20 * This file contains the specific functions to support the MV64360
21 * interrupt controller.
23 * The MV64360 has two main interrupt registers (high and low) that
24 * summarizes the interrupts generated by the units of the MV64360.
25 * Each bit is assigned to an interrupt number, where the low register
26 * are assigned from IRQ0 to IRQ31 and the high cause register
28 * The GPP (General Purpose Pins) interrupts are assigned from IRQ64 (GPP0)
30 * get_irq() returns the lowest interrupt number that is currently asserted.
33 * - This driver does not initialize the GPP when used as an interrupt
37 #include <linux/stddef.h>
38 #include <linux/init.h>
39 #include <linux/sched.h>
40 #include <linux/signal.h>
41 #include <linux/stddef.h>
42 #include <linux/delay.h>
43 #include <linux/irq.h>
44 #include <linux/interrupt.h>
47 #include <asm/processor.h>
48 #include <asm/system.h>
50 #include <asm/mv64x60.h>
51 #include <asm/machdep.h>
53 #ifdef CONFIG_IRQ_ALL_CPUS
54 #error "The mv64360 does not support distribution of IRQs on all CPUs"
56 /* ========================== forward declaration ========================== */
58 static void mv64360_unmask_irq(unsigned int);
59 static void mv64360_mask_irq(unsigned int);
60 static irqreturn_t mv64360_cpu_error_int_handler(int, void *, struct pt_regs *);
61 static irqreturn_t mv64360_sram_error_int_handler(int, void *,
63 static irqreturn_t mv64360_pci_error_int_handler(int, void *, struct pt_regs *);
65 /* ========================== local declarations =========================== */
67 struct hw_interrupt_type mv64360_pic = {
68 .typename = " mv64360 ",
69 .enable = mv64360_unmask_irq,
70 .disable = mv64360_mask_irq,
71 .ack = mv64360_mask_irq,
72 .end = mv64360_unmask_irq,
75 #define CPU_INTR_STR "mv64360 cpu interface error"
76 #define SRAM_INTR_STR "mv64360 internal sram error"
77 #define PCI0_INTR_STR "mv64360 pci 0 error"
78 #define PCI1_INTR_STR "mv64360 pci 1 error"
80 static struct mv64x60_handle bh;
82 u32 mv64360_irq_base = 0; /* MV64360 handles the next 96 IRQs from here */
86 * This function initializes the interrupt controller. It assigns
87 * all interrupts from IRQ0 to IRQ95 to the mv64360 interrupt controller.
99 * We register all GPP inputs as interrupt source, but disable them.
102 mv64360_init_irq(void)
107 ppc_md.progress("mv64360_init_irq: enter", 0x0);
109 bh.v_base = mv64x60_get_bridge_vbase();
111 ppc_cached_irq_mask[0] = 0;
112 ppc_cached_irq_mask[1] = 0x0f000000; /* Enable GPP intrs */
113 ppc_cached_irq_mask[2] = 0;
115 /* disable all interrupts and clear current interrupts */
116 mv64x60_write(&bh, MV64x60_GPP_INTR_CAUSE, 0);
117 mv64x60_write(&bh, MV64x60_GPP_INTR_MASK, ppc_cached_irq_mask[2]);
118 mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_LO,ppc_cached_irq_mask[0]);
119 mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_HI,ppc_cached_irq_mask[1]);
121 /* All interrupts are level interrupts */
122 for (i = mv64360_irq_base; i < (mv64360_irq_base + 96); i++) {
123 irq_desc[i].status |= IRQ_LEVEL;
124 irq_desc[i].handler = &mv64360_pic;
128 ppc_md.progress("mv64360_init_irq: exit", 0x0);
133 * This function returns the lowest interrupt number of all interrupts that
134 * are currently asserted.
137 * struct pt_regs* not used
139 * Output Variable(s):
143 * int <interrupt number> or -2 (bogus interrupt)
147 mv64360_get_irq(struct pt_regs *regs)
154 * Second CPU gets only doorbell (message) interrupts.
155 * The doorbell interrupt is BIT28 in the main interrupt low cause reg.
157 int cpu_nr = smp_processor_id();
159 if (!(mv64x60_read(&bh, MV64360_IC_MAIN_CAUSE_LO) &
160 (1 << MV64x60_IRQ_DOORBELL)))
162 return mv64360_irq_base + MV64x60_IRQ_DOORBELL;
166 irq = mv64x60_read(&bh, MV64360_IC_MAIN_CAUSE_LO);
167 irq = __ilog2((irq & 0x3dfffffe) & ppc_cached_irq_mask[0]);
170 irq = mv64x60_read(&bh, MV64360_IC_MAIN_CAUSE_HI);
171 irq = __ilog2((irq & 0x1f0003f7) & ppc_cached_irq_mask[1]);
174 irq = -2; /* bogus interrupt, should never happen */
176 if ((irq >= 24) && (irq < MV64x60_IRQ_DOORBELL)) {
177 irq_gpp = mv64x60_read(&bh,
178 MV64x60_GPP_INTR_CAUSE);
179 irq_gpp = __ilog2(irq_gpp &
180 ppc_cached_irq_mask[2]);
187 MV64x60_GPP_INTR_CAUSE,
196 (void)mv64x60_read(&bh, MV64x60_GPP_INTR_CAUSE);
201 return (mv64360_irq_base + irq);
204 /* mv64360_unmask_irq()
206 * This function enables an interrupt.
209 * unsigned int interrupt number (IRQ0...IRQ95).
211 * Output Variable(s):
218 mv64360_unmask_irq(unsigned int irq)
221 /* second CPU gets only doorbell interrupts */
222 if ((irq - mv64360_irq_base) == MV64x60_IRQ_DOORBELL) {
223 mv64x60_set_bits(&bh, MV64360_IC_CPU1_INTR_MASK_LO,
224 (1 << MV64x60_IRQ_DOORBELL));
228 irq -= mv64360_irq_base;
231 if (irq > 63) /* unmask GPP irq */
232 mv64x60_write(&bh, MV64x60_GPP_INTR_MASK,
233 ppc_cached_irq_mask[2] |= (1 << (irq - 64)));
234 else /* mask high interrupt register */
235 mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_HI,
236 ppc_cached_irq_mask[1] |= (1 << (irq - 32)));
238 else /* mask low interrupt register */
239 mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_LO,
240 ppc_cached_irq_mask[0] |= (1 << irq));
242 (void)mv64x60_read(&bh, MV64x60_GPP_INTR_MASK);
246 /* mv64360_mask_irq()
248 * This function disables the requested interrupt.
251 * unsigned int interrupt number (IRQ0...IRQ95).
253 * Output Variable(s):
260 mv64360_mask_irq(unsigned int irq)
263 if ((irq - mv64360_irq_base) == MV64x60_IRQ_DOORBELL) {
264 mv64x60_clr_bits(&bh, MV64360_IC_CPU1_INTR_MASK_LO,
265 (1 << MV64x60_IRQ_DOORBELL));
269 irq -= mv64360_irq_base;
272 if (irq > 63) /* mask GPP irq */
273 mv64x60_write(&bh, MV64x60_GPP_INTR_MASK,
274 ppc_cached_irq_mask[2] &= ~(1 << (irq - 64)));
275 else /* mask high interrupt register */
276 mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_HI,
277 ppc_cached_irq_mask[1] &= ~(1 << (irq - 32)));
279 else /* mask low interrupt register */
280 mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_LO,
281 ppc_cached_irq_mask[0] &= ~(1 << irq));
283 (void)mv64x60_read(&bh, MV64x60_GPP_INTR_MASK);
288 mv64360_cpu_error_int_handler(int irq, void *dev_id, struct pt_regs *regs)
290 printk(KERN_ERR "mv64360_cpu_error_int_handler: %s 0x%08x\n",
291 "Error on CPU interface - Cause regiser",
292 mv64x60_read(&bh, MV64x60_CPU_ERR_CAUSE));
293 printk(KERN_ERR "\tCPU error register dump:\n");
294 printk(KERN_ERR "\tAddress low 0x%08x\n",
295 mv64x60_read(&bh, MV64x60_CPU_ERR_ADDR_LO));
296 printk(KERN_ERR "\tAddress high 0x%08x\n",
297 mv64x60_read(&bh, MV64x60_CPU_ERR_ADDR_HI));
298 printk(KERN_ERR "\tData low 0x%08x\n",
299 mv64x60_read(&bh, MV64x60_CPU_ERR_DATA_LO));
300 printk(KERN_ERR "\tData high 0x%08x\n",
301 mv64x60_read(&bh, MV64x60_CPU_ERR_DATA_HI));
302 printk(KERN_ERR "\tParity 0x%08x\n",
303 mv64x60_read(&bh, MV64x60_CPU_ERR_PARITY));
304 mv64x60_write(&bh, MV64x60_CPU_ERR_CAUSE, 0);
309 mv64360_sram_error_int_handler(int irq, void *dev_id, struct pt_regs *regs)
311 printk(KERN_ERR "mv64360_sram_error_int_handler: %s 0x%08x\n",
312 "Error in internal SRAM - Cause register",
313 mv64x60_read(&bh, MV64360_SRAM_ERR_CAUSE));
314 printk(KERN_ERR "\tSRAM error register dump:\n");
315 printk(KERN_ERR "\tAddress Low 0x%08x\n",
316 mv64x60_read(&bh, MV64360_SRAM_ERR_ADDR_LO));
317 printk(KERN_ERR "\tAddress High 0x%08x\n",
318 mv64x60_read(&bh, MV64360_SRAM_ERR_ADDR_HI));
319 printk(KERN_ERR "\tData Low 0x%08x\n",
320 mv64x60_read(&bh, MV64360_SRAM_ERR_DATA_LO));
321 printk(KERN_ERR "\tData High 0x%08x\n",
322 mv64x60_read(&bh, MV64360_SRAM_ERR_DATA_HI));
323 printk(KERN_ERR "\tParity 0x%08x\n",
324 mv64x60_read(&bh, MV64360_SRAM_ERR_PARITY));
325 mv64x60_write(&bh, MV64360_SRAM_ERR_CAUSE, 0);
330 mv64360_pci_error_int_handler(int irq, void *dev_id, struct pt_regs *regs)
333 unsigned int pci_bus = (unsigned int)dev_id;
335 if (pci_bus == 0) { /* Error on PCI 0 */
336 val = mv64x60_read(&bh, MV64x60_PCI0_ERR_CAUSE);
337 printk(KERN_ERR "%s: Error in PCI %d Interface\n",
338 "mv64360_pci_error_int_handler", pci_bus);
339 printk(KERN_ERR "\tPCI %d error register dump:\n", pci_bus);
340 printk(KERN_ERR "\tCause register 0x%08x\n", val);
341 printk(KERN_ERR "\tAddress Low 0x%08x\n",
342 mv64x60_read(&bh, MV64x60_PCI0_ERR_ADDR_LO));
343 printk(KERN_ERR "\tAddress High 0x%08x\n",
344 mv64x60_read(&bh, MV64x60_PCI0_ERR_ADDR_HI));
345 printk(KERN_ERR "\tAttribute 0x%08x\n",
346 mv64x60_read(&bh, MV64x60_PCI0_ERR_DATA_LO));
347 printk(KERN_ERR "\tCommand 0x%08x\n",
348 mv64x60_read(&bh, MV64x60_PCI0_ERR_CMD));
349 mv64x60_write(&bh, MV64x60_PCI0_ERR_CAUSE, ~val);
351 if (pci_bus == 1) { /* Error on PCI 1 */
352 val = mv64x60_read(&bh, MV64x60_PCI1_ERR_CAUSE);
353 printk(KERN_ERR "%s: Error in PCI %d Interface\n",
354 "mv64360_pci_error_int_handler", pci_bus);
355 printk(KERN_ERR "\tPCI %d error register dump:\n", pci_bus);
356 printk(KERN_ERR "\tCause register 0x%08x\n", val);
357 printk(KERN_ERR "\tAddress Low 0x%08x\n",
358 mv64x60_read(&bh, MV64x60_PCI1_ERR_ADDR_LO));
359 printk(KERN_ERR "\tAddress High 0x%08x\n",
360 mv64x60_read(&bh, MV64x60_PCI1_ERR_ADDR_HI));
361 printk(KERN_ERR "\tAttribute 0x%08x\n",
362 mv64x60_read(&bh, MV64x60_PCI1_ERR_DATA_LO));
363 printk(KERN_ERR "\tCommand 0x%08x\n",
364 mv64x60_read(&bh, MV64x60_PCI1_ERR_CMD));
365 mv64x60_write(&bh, MV64x60_PCI1_ERR_CAUSE, ~val);
371 * Bit 0 of MV64x60_PCIx_ERR_MASK does not exist on the 64360 and because of
372 * errata FEr-#11 and FEr-##16 for the 64460, it should be 0 on that chip as
373 * well. IOW, don't set bit 0.
375 #define MV64360_PCI0_ERR_MASK_VAL 0x00a50c24
378 mv64360_register_hdlrs(void)
382 /* Clear old errors and register CPU interface error intr handler */
383 mv64x60_write(&bh, MV64x60_CPU_ERR_CAUSE, 0);
384 if ((rc = request_irq(MV64x60_IRQ_CPU_ERR + mv64360_irq_base,
385 mv64360_cpu_error_int_handler, SA_INTERRUPT, CPU_INTR_STR, 0)))
386 printk(KERN_WARNING "Can't register cpu error handler: %d", rc);
388 mv64x60_write(&bh, MV64x60_CPU_ERR_MASK, 0);
389 mv64x60_write(&bh, MV64x60_CPU_ERR_MASK, 0x000000ff);
391 /* Clear old errors and register internal SRAM error intr handler */
392 mv64x60_write(&bh, MV64360_SRAM_ERR_CAUSE, 0);
393 if ((rc = request_irq(MV64360_IRQ_SRAM_PAR_ERR + mv64360_irq_base,
394 mv64360_sram_error_int_handler,SA_INTERRUPT,SRAM_INTR_STR, 0)))
395 printk(KERN_WARNING "Can't register SRAM error handler: %d",rc);
397 /* Clear old errors and register PCI 0 error intr handler */
398 mv64x60_write(&bh, MV64x60_PCI0_ERR_CAUSE, 0);
399 if ((rc = request_irq(MV64360_IRQ_PCI0 + mv64360_irq_base,
400 mv64360_pci_error_int_handler,
401 SA_INTERRUPT, PCI0_INTR_STR, (void *)0)))
402 printk(KERN_WARNING "Can't register pci 0 error handler: %d",
405 mv64x60_write(&bh, MV64x60_PCI0_ERR_MASK, 0);
406 mv64x60_write(&bh, MV64x60_PCI0_ERR_MASK, MV64360_PCI0_ERR_MASK_VAL);
408 /* Erratum FEr PCI-#16 says to clear bit 0 of PCI SERRn Mask reg. */
409 mv64x60_write(&bh, MV64x60_PCI0_ERR_SERR_MASK,
410 mv64x60_read(&bh, MV64x60_PCI0_ERR_SERR_MASK) & ~0x1UL);
412 /* Clear old errors and register PCI 1 error intr handler */
413 mv64x60_write(&bh, MV64x60_PCI1_ERR_CAUSE, 0);
414 if ((rc = request_irq(MV64360_IRQ_PCI1 + mv64360_irq_base,
415 mv64360_pci_error_int_handler,
416 SA_INTERRUPT, PCI1_INTR_STR, (void *)1)))
417 printk(KERN_WARNING "Can't register pci 1 error handler: %d",
420 mv64x60_write(&bh, MV64x60_PCI1_ERR_MASK, 0);
421 mv64x60_write(&bh, MV64x60_PCI1_ERR_MASK, MV64360_PCI0_ERR_MASK_VAL);
423 /* Erratum FEr PCI-#16 says to clear bit 0 of PCI Intr Mask reg. */
424 mv64x60_write(&bh, MV64x60_PCI1_ERR_SERR_MASK,
425 mv64x60_read(&bh, MV64x60_PCI1_ERR_SERR_MASK) & ~0x1UL);
430 arch_initcall(mv64360_register_hdlrs);