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[PATCH] briq_panel: read() and write() get __user pointers, damnit
[linux-2.6/verdex.git] / arch / ppc / syslib / mv64360_pic.c
blob3f6d162f87cfa635b54263757f401127ee99b454
1 /*
2 * Interrupt controller support for Marvell's MV64360.
3 *
4 * Author: Rabeeh Khoury <rabeeh@galileo.co.il>
5 * Based on MV64360 PIC written by
6 * Chris Zankel <chris@mvista.com>
7 * Mark A. Greer <mgreer@mvista.com>
8 *
9 * Copyright 2004 MontaVista Software, Inc.
10 *
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.
15 */
16
17 /*
18 * This file contains the specific functions to support the MV64360
19 * interrupt controller.
20 *
21 * The MV64360 has two main interrupt registers (high and low) that
22 * summarizes the interrupts generated by the units of the MV64360.
23 * Each bit is assigned to an interrupt number, where the low register
24 * are assigned from IRQ0 to IRQ31 and the high cause register
25 * from IRQ32 to IRQ63
26 * The GPP (General Purpose Pins) interrupts are assigned from IRQ64 (GPP0)
27 * to IRQ95 (GPP31).
28 * get_irq() returns the lowest interrupt number that is currently asserted.
29 *
30 * Note:
31 * - This driver does not initialize the GPP when used as an interrupt
32 * input.
33 */
34
35 #include <linux/stddef.h>
36 #include <linux/init.h>
37 #include <linux/sched.h>
38 #include <linux/signal.h>
39 #include <linux/stddef.h>
40 #include <linux/delay.h>
41 #include <linux/irq.h>
42 #include <linux/interrupt.h>
43
44 #include <asm/io.h>
45 #include <asm/processor.h>
46 #include <asm/system.h>
47 #include <asm/irq.h>
48 #include <asm/mv64x60.h>
49 #include <asm/machdep.h>
50
51 #ifdef CONFIG_IRQ_ALL_CPUS
52 #error "The mv64360 does not support distribution of IRQs on all CPUs"
53 #endif
54 /* ========================== forward declaration ========================== */
55
56 static void mv64360_unmask_irq(unsigned int);
57 static void mv64360_mask_irq(unsigned int);
58 static irqreturn_t mv64360_cpu_error_int_handler(int, void *, struct pt_regs *);
59 static irqreturn_t mv64360_sram_error_int_handler(int, void *,
60 struct pt_regs *);
61 static irqreturn_t mv64360_pci_error_int_handler(int, void *, struct pt_regs *);
62
63 /* ========================== local declarations =========================== */
64
65 struct hw_interrupt_type mv64360_pic = {
66 .typename = " mv64360 ",
67 .enable = mv64360_unmask_irq,
68 .disable = mv64360_mask_irq,
69 .ack = mv64360_mask_irq,
70 .end = mv64360_unmask_irq,
71 };
72
73 #define CPU_INTR_STR "mv64360 cpu interface error"
74 #define SRAM_INTR_STR "mv64360 internal sram error"
75 #define PCI0_INTR_STR "mv64360 pci 0 error"
76 #define PCI1_INTR_STR "mv64360 pci 1 error"
77
78 static struct mv64x60_handle bh;
79
80 u32 mv64360_irq_base = 0; /* MV64360 handles the next 96 IRQs from here */
81
82 /* mv64360_init_irq()
83 *
84 * This function initializes the interrupt controller. It assigns
85 * all interrupts from IRQ0 to IRQ95 to the mv64360 interrupt controller.
86 *
87 * Input Variable(s):
88 * None.
89 *
90 * Outpu. Variable(s):
91 * None.
92 *
93 * Returns:
94 * void
95 *
96 * Note:
97 * We register all GPP inputs as interrupt source, but disable them.
98 */
99 void __init
100 mv64360_init_irq(void)
101 {
102 int i;
103
104 if (ppc_md.progress)
105 ppc_md.progress("mv64360_init_irq: enter", 0x0);
106
107 bh.v_base = mv64x60_get_bridge_vbase();
108
109 ppc_cached_irq_mask[0] = 0;
110 ppc_cached_irq_mask[1] = 0x0f000000; /* Enable GPP intrs */
111 ppc_cached_irq_mask[2] = 0;
112
113 /* disable all interrupts and clear current interrupts */
114 mv64x60_write(&bh, MV64x60_GPP_INTR_CAUSE, 0);
115 mv64x60_write(&bh, MV64x60_GPP_INTR_MASK, ppc_cached_irq_mask[2]);
116 mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_LO,ppc_cached_irq_mask[0]);
117 mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_HI,ppc_cached_irq_mask[1]);
118
119 /* All interrupts are level interrupts */
120 for (i = mv64360_irq_base; i < (mv64360_irq_base + 96); i++) {
121 irq_desc[i].status |= IRQ_LEVEL;
122 irq_desc[i].chip = &mv64360_pic;
123 }
124
125 if (ppc_md.progress)
126 ppc_md.progress("mv64360_init_irq: exit", 0x0);
127 }
128
129 /* mv64360_get_irq()
130 *
131 * This function returns the lowest interrupt number of all interrupts that
132 * are currently asserted.
133 *
134 * Input Variable(s):
135 * struct pt_regs* not used
136 *
137 * Output Variable(s):
138 * None.
139 *
140 * Returns:
141 * int <interrupt number> or -2 (bogus interrupt)
142 *
143 */
144 int
145 mv64360_get_irq(struct pt_regs *regs)
146 {
147 int irq;
148 int irq_gpp;
149
150 #ifdef CONFIG_SMP
151 /*
152 * Second CPU gets only doorbell (message) interrupts.
153 * The doorbell interrupt is BIT28 in the main interrupt low cause reg.
154 */
155 int cpu_nr = smp_processor_id();
156 if (cpu_nr == 1) {
157 if (!(mv64x60_read(&bh, MV64360_IC_MAIN_CAUSE_LO) &
158 (1 << MV64x60_IRQ_DOORBELL)))
159 return -1;
160 return mv64360_irq_base + MV64x60_IRQ_DOORBELL;
161 }
162 #endif
163
164 irq = mv64x60_read(&bh, MV64360_IC_MAIN_CAUSE_LO);
165 irq = __ilog2((irq & 0x3dfffffe) & ppc_cached_irq_mask[0]);
166
167 if (irq == -1) {
168 irq = mv64x60_read(&bh, MV64360_IC_MAIN_CAUSE_HI);
169 irq = __ilog2((irq & 0x1f0003f7) & ppc_cached_irq_mask[1]);
170
171 if (irq == -1)
172 irq = -2; /* bogus interrupt, should never happen */
173 else {
174 if ((irq >= 24) && (irq < MV64x60_IRQ_DOORBELL)) {
175 irq_gpp = mv64x60_read(&bh,
176 MV64x60_GPP_INTR_CAUSE);
177 irq_gpp = __ilog2(irq_gpp &
178 ppc_cached_irq_mask[2]);
179
180 if (irq_gpp == -1)
181 irq = -2;
182 else {
183 irq = irq_gpp + 64;
184 mv64x60_write(&bh,
185 MV64x60_GPP_INTR_CAUSE,
186 ~(1 << (irq - 64)));
187 }
188 }
189 else
190 irq += 32;
191 }
192 }
193
194 (void)mv64x60_read(&bh, MV64x60_GPP_INTR_CAUSE);
195
196 if (irq < 0)
197 return (irq);
198 else
199 return (mv64360_irq_base + irq);
200 }
201
202 /* mv64360_unmask_irq()
203 *
204 * This function enables an interrupt.
205 *
206 * Input Variable(s):
207 * unsigned int interrupt number (IRQ0...IRQ95).
208 *
209 * Output Variable(s):
210 * None.
211 *
212 * Returns:
213 * void
214 */
215 static void
216 mv64360_unmask_irq(unsigned int irq)
217 {
218 #ifdef CONFIG_SMP
219 /* second CPU gets only doorbell interrupts */
220 if ((irq - mv64360_irq_base) == MV64x60_IRQ_DOORBELL) {
221 mv64x60_set_bits(&bh, MV64360_IC_CPU1_INTR_MASK_LO,
222 (1 << MV64x60_IRQ_DOORBELL));
223 return;
224 }
225 #endif
226 irq -= mv64360_irq_base;
227
228 if (irq > 31) {
229 if (irq > 63) /* unmask GPP irq */
230 mv64x60_write(&bh, MV64x60_GPP_INTR_MASK,
231 ppc_cached_irq_mask[2] |= (1 << (irq - 64)));
232 else /* mask high interrupt register */
233 mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_HI,
234 ppc_cached_irq_mask[1] |= (1 << (irq - 32)));
235 }
236 else /* mask low interrupt register */
237 mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_LO,
238 ppc_cached_irq_mask[0] |= (1 << irq));
239
240 (void)mv64x60_read(&bh, MV64x60_GPP_INTR_MASK);
241 return;
242 }
243
244 /* mv64360_mask_irq()
245 *
246 * This function disables the requested interrupt.
247 *
248 * Input Variable(s):
249 * unsigned int interrupt number (IRQ0...IRQ95).
250 *
251 * Output Variable(s):
252 * None.
253 *
254 * Returns:
255 * void
256 */
257 static void
258 mv64360_mask_irq(unsigned int irq)
259 {
260 #ifdef CONFIG_SMP
261 if ((irq - mv64360_irq_base) == MV64x60_IRQ_DOORBELL) {
262 mv64x60_clr_bits(&bh, MV64360_IC_CPU1_INTR_MASK_LO,
263 (1 << MV64x60_IRQ_DOORBELL));
264 return;
265 }
266 #endif
267 irq -= mv64360_irq_base;
268
269 if (irq > 31) {
270 if (irq > 63) /* mask GPP irq */
271 mv64x60_write(&bh, MV64x60_GPP_INTR_MASK,
272 ppc_cached_irq_mask[2] &= ~(1 << (irq - 64)));
273 else /* mask high interrupt register */
274 mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_HI,
275 ppc_cached_irq_mask[1] &= ~(1 << (irq - 32)));
276 }
277 else /* mask low interrupt register */
278 mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_LO,
279 ppc_cached_irq_mask[0] &= ~(1 << irq));
280
281 (void)mv64x60_read(&bh, MV64x60_GPP_INTR_MASK);
282 return;
283 }
284
285 static irqreturn_t
286 mv64360_cpu_error_int_handler(int irq, void *dev_id, struct pt_regs *regs)
287 {
288 printk(KERN_ERR "mv64360_cpu_error_int_handler: %s 0x%08x\n",
289 "Error on CPU interface - Cause regiser",
290 mv64x60_read(&bh, MV64x60_CPU_ERR_CAUSE));
291 printk(KERN_ERR "\tCPU error register dump:\n");
292 printk(KERN_ERR "\tAddress low 0x%08x\n",
293 mv64x60_read(&bh, MV64x60_CPU_ERR_ADDR_LO));
294 printk(KERN_ERR "\tAddress high 0x%08x\n",
295 mv64x60_read(&bh, MV64x60_CPU_ERR_ADDR_HI));
296 printk(KERN_ERR "\tData low 0x%08x\n",
297 mv64x60_read(&bh, MV64x60_CPU_ERR_DATA_LO));
298 printk(KERN_ERR "\tData high 0x%08x\n",
299 mv64x60_read(&bh, MV64x60_CPU_ERR_DATA_HI));
300 printk(KERN_ERR "\tParity 0x%08x\n",
301 mv64x60_read(&bh, MV64x60_CPU_ERR_PARITY));
302 mv64x60_write(&bh, MV64x60_CPU_ERR_CAUSE, 0);
303 return IRQ_HANDLED;
304 }
305
306 static irqreturn_t
307 mv64360_sram_error_int_handler(int irq, void *dev_id, struct pt_regs *regs)
308 {
309 printk(KERN_ERR "mv64360_sram_error_int_handler: %s 0x%08x\n",
310 "Error in internal SRAM - Cause register",
311 mv64x60_read(&bh, MV64360_SRAM_ERR_CAUSE));
312 printk(KERN_ERR "\tSRAM error register dump:\n");
313 printk(KERN_ERR "\tAddress Low 0x%08x\n",
314 mv64x60_read(&bh, MV64360_SRAM_ERR_ADDR_LO));
315 printk(KERN_ERR "\tAddress High 0x%08x\n",
316 mv64x60_read(&bh, MV64360_SRAM_ERR_ADDR_HI));
317 printk(KERN_ERR "\tData Low 0x%08x\n",
318 mv64x60_read(&bh, MV64360_SRAM_ERR_DATA_LO));
319 printk(KERN_ERR "\tData High 0x%08x\n",
320 mv64x60_read(&bh, MV64360_SRAM_ERR_DATA_HI));
321 printk(KERN_ERR "\tParity 0x%08x\n",
322 mv64x60_read(&bh, MV64360_SRAM_ERR_PARITY));
323 mv64x60_write(&bh, MV64360_SRAM_ERR_CAUSE, 0);
324 return IRQ_HANDLED;
325 }
326
327 static irqreturn_t
328 mv64360_pci_error_int_handler(int irq, void *dev_id, struct pt_regs *regs)
329 {
330 u32 val;
331 unsigned int pci_bus = (unsigned int)dev_id;
332
333 if (pci_bus == 0) { /* Error on PCI 0 */
334 val = mv64x60_read(&bh, MV64x60_PCI0_ERR_CAUSE);
335 printk(KERN_ERR "%s: Error in PCI %d Interface\n",
336 "mv64360_pci_error_int_handler", pci_bus);
337 printk(KERN_ERR "\tPCI %d error register dump:\n", pci_bus);
338 printk(KERN_ERR "\tCause register 0x%08x\n", val);
339 printk(KERN_ERR "\tAddress Low 0x%08x\n",
340 mv64x60_read(&bh, MV64x60_PCI0_ERR_ADDR_LO));
341 printk(KERN_ERR "\tAddress High 0x%08x\n",
342 mv64x60_read(&bh, MV64x60_PCI0_ERR_ADDR_HI));
343 printk(KERN_ERR "\tAttribute 0x%08x\n",
344 mv64x60_read(&bh, MV64x60_PCI0_ERR_DATA_LO));
345 printk(KERN_ERR "\tCommand 0x%08x\n",
346 mv64x60_read(&bh, MV64x60_PCI0_ERR_CMD));
347 mv64x60_write(&bh, MV64x60_PCI0_ERR_CAUSE, ~val);
348 }
349 if (pci_bus == 1) { /* Error on PCI 1 */
350 val = mv64x60_read(&bh, MV64x60_PCI1_ERR_CAUSE);
351 printk(KERN_ERR "%s: Error in PCI %d Interface\n",
352 "mv64360_pci_error_int_handler", pci_bus);
353 printk(KERN_ERR "\tPCI %d error register dump:\n", pci_bus);
354 printk(KERN_ERR "\tCause register 0x%08x\n", val);
355 printk(KERN_ERR "\tAddress Low 0x%08x\n",
356 mv64x60_read(&bh, MV64x60_PCI1_ERR_ADDR_LO));
357 printk(KERN_ERR "\tAddress High 0x%08x\n",
358 mv64x60_read(&bh, MV64x60_PCI1_ERR_ADDR_HI));
359 printk(KERN_ERR "\tAttribute 0x%08x\n",
360 mv64x60_read(&bh, MV64x60_PCI1_ERR_DATA_LO));
361 printk(KERN_ERR "\tCommand 0x%08x\n",
362 mv64x60_read(&bh, MV64x60_PCI1_ERR_CMD));
363 mv64x60_write(&bh, MV64x60_PCI1_ERR_CAUSE, ~val);
364 }
365 return IRQ_HANDLED;
366 }
367
368 /*
369 * Bit 0 of MV64x60_PCIx_ERR_MASK does not exist on the 64360 and because of
370 * errata FEr-#11 and FEr-##16 for the 64460, it should be 0 on that chip as
371 * well. IOW, don't set bit 0.
372 */
373 #define MV64360_PCI0_ERR_MASK_VAL 0x00a50c24
374
375 static int __init
376 mv64360_register_hdlrs(void)
377 {
378 int rc;
379
380 /* Clear old errors and register CPU interface error intr handler */
381 mv64x60_write(&bh, MV64x60_CPU_ERR_CAUSE, 0);
382 if ((rc = request_irq(MV64x60_IRQ_CPU_ERR + mv64360_irq_base,
383 mv64360_cpu_error_int_handler, IRQF_DISABLED, CPU_INTR_STR, 0)))
384 printk(KERN_WARNING "Can't register cpu error handler: %d", rc);
385
386 mv64x60_write(&bh, MV64x60_CPU_ERR_MASK, 0);
387 mv64x60_write(&bh, MV64x60_CPU_ERR_MASK, 0x000000ff);
388
389 /* Clear old errors and register internal SRAM error intr handler */
390 mv64x60_write(&bh, MV64360_SRAM_ERR_CAUSE, 0);
391 if ((rc = request_irq(MV64360_IRQ_SRAM_PAR_ERR + mv64360_irq_base,
392 mv64360_sram_error_int_handler,IRQF_DISABLED,SRAM_INTR_STR, 0)))
393 printk(KERN_WARNING "Can't register SRAM error handler: %d",rc);
394
395 /* Clear old errors and register PCI 0 error intr handler */
396 mv64x60_write(&bh, MV64x60_PCI0_ERR_CAUSE, 0);
397 if ((rc = request_irq(MV64360_IRQ_PCI0 + mv64360_irq_base,
398 mv64360_pci_error_int_handler,
399 IRQF_DISABLED, PCI0_INTR_STR, (void *)0)))
400 printk(KERN_WARNING "Can't register pci 0 error handler: %d",
401 rc);
402
403 mv64x60_write(&bh, MV64x60_PCI0_ERR_MASK, 0);
404 mv64x60_write(&bh, MV64x60_PCI0_ERR_MASK, MV64360_PCI0_ERR_MASK_VAL);
405
406 /* Erratum FEr PCI-#16 says to clear bit 0 of PCI SERRn Mask reg. */
407 mv64x60_write(&bh, MV64x60_PCI0_ERR_SERR_MASK,
408 mv64x60_read(&bh, MV64x60_PCI0_ERR_SERR_MASK) & ~0x1UL);
409
410 /* Clear old errors and register PCI 1 error intr handler */
411 mv64x60_write(&bh, MV64x60_PCI1_ERR_CAUSE, 0);
412 if ((rc = request_irq(MV64360_IRQ_PCI1 + mv64360_irq_base,
413 mv64360_pci_error_int_handler,
414 IRQF_DISABLED, PCI1_INTR_STR, (void *)1)))
415 printk(KERN_WARNING "Can't register pci 1 error handler: %d",
416 rc);
417
418 mv64x60_write(&bh, MV64x60_PCI1_ERR_MASK, 0);
419 mv64x60_write(&bh, MV64x60_PCI1_ERR_MASK, MV64360_PCI0_ERR_MASK_VAL);
420
421 /* Erratum FEr PCI-#16 says to clear bit 0 of PCI Intr Mask reg. */
422 mv64x60_write(&bh, MV64x60_PCI1_ERR_SERR_MASK,
423 mv64x60_read(&bh, MV64x60_PCI1_ERR_SERR_MASK) & ~0x1UL);
424
425 return 0;
426 }
427
428 arch_initcall(mv64360_register_hdlrs);
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