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1 /*-
2  * Copyright (c) 2006 Benno Rice.
3  * Copyright (C) 2007-2011 MARVELL INTERNATIONAL LTD.
4  * Copyright (c) 2012 Semihalf.
5  * All rights reserved.
6  *
7  * Developed by Semihalf.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28  *
29  * from: FreeBSD: //depot/projects/arm/src/sys/arm/xscale/pxa2x0/pxa2x0_icu.c, rev 1
30  * from: FreeBSD: src/sys/arm/mv/ic.c,v 1.5 2011/02/08 01:49:30
31  */
32
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/bus.h>
39 #include <sys/kernel.h>
40 #include <sys/cpuset.h>
41 #include <sys/ktr.h>
42 #include <sys/module.h>
43 #include <sys/rman.h>
44
45 #include <machine/bus.h>
46 #include <machine/intr.h>
47 #include <machine/cpufunc.h>
48 #include <machine/smp.h>
49
50 #include <arm/mv/mvvar.h>
51
52 #include <dev/ofw/ofw_bus.h>
53 #include <dev/ofw/ofw_bus_subr.h>
54 #include <dev/fdt/fdt_common.h>
55
56 #ifdef DEBUG
57 #define debugf(fmt, args...) do { printf("%s(): ", __func__);   \
58     printf(fmt,##args); } while (0)
59 #else
60 #define debugf(fmt, args...)
61 #endif
62
63 #define MPIC_INT_ERR                    4
64 #define MPIC_INT_MSI                    96
65
66 #define IRQ_MASK                0x3ff
67
68 #define MPIC_CTRL               0x0
69 #define MPIC_SOFT_INT           0x4
70 #define MPIC_SOFT_INT_DRBL1     (1 << 5)
71 #define MPIC_ERR_CAUSE          0x20
72 #define MPIC_ISE                0x30
73 #define MPIC_ICE                0x34
74
75
76 #define MPIC_IN_DRBL            0x78
77 #define MPIC_IN_DRBL_MASK       0x7c
78 #define MPIC_CTP                0xb0
79 #define MPIC_CTP                0xb0
80 #define MPIC_IIACK              0xb4
81 #define MPIC_ISM                0xb8
82 #define MPIC_ICM                0xbc
83 #define MPIC_ERR_MASK           0xec0
84
85 struct mv_mpic_softc {
86         device_t                sc_dev;
87         struct resource *       mpic_res[3];
88         bus_space_tag_t         mpic_bst;
89         bus_space_handle_t      mpic_bsh;
90         bus_space_tag_t         cpu_bst;
91         bus_space_handle_t      cpu_bsh;
92         bus_space_tag_t         drbl_bst;
93         bus_space_handle_t      drbl_bsh;
94 };
95
96 static struct resource_spec mv_mpic_spec[] = {
97         { SYS_RES_MEMORY,       0,      RF_ACTIVE },
98         { SYS_RES_MEMORY,       1,      RF_ACTIVE },
99         { SYS_RES_MEMORY,       2,      RF_ACTIVE },
100         { -1, 0 }
101 };
102
103 static struct mv_mpic_softc *mv_mpic_sc = NULL;
104
105 void mpic_send_ipi(int cpus, u_int ipi);
106
107 static int      mv_mpic_probe(device_t);
108 static int      mv_mpic_attach(device_t);
109 uint32_t        mv_mpic_get_cause(void);
110 uint32_t        mv_mpic_get_cause_err(void);
111 uint32_t        mv_mpic_get_msi(void);
112 static void     arm_mask_irq_err(uintptr_t);
113 static void     arm_unmask_irq_err(uintptr_t);
114 static void     arm_unmask_msi(void);
115
116 #define MPIC_CPU_WRITE(softc, reg, val) \
117     bus_space_write_4((softc)->cpu_bst, (softc)->cpu_bsh, (reg), (val))
118 #define MPIC_CPU_READ(softc, reg) \
119     bus_space_read_4((softc)->cpu_bst, (softc)->cpu_bsh, (reg))
120
121 #define MPIC_DRBL_WRITE(softc, reg, val) \
122     bus_space_write_4((softc)->drbl_bst, (softc)->drbl_bsh, (reg), (val))
123 #define MPIC_DRBL_READ(softc, reg) \
124     bus_space_read_4((softc)->drbl_bst, (softc)->drbl_bsh, (reg))
125
126 static int
127 mv_mpic_probe(device_t dev)
128 {
129
130         if (!ofw_bus_status_okay(dev))
131                 return (ENXIO);
132
133         if (!ofw_bus_is_compatible(dev, "mrvl,mpic"))
134                 return (ENXIO);
135
136         device_set_desc(dev, "Marvell Integrated Interrupt Controller");
137         return (0);
138 }
139
140 static int
141 mv_mpic_attach(device_t dev)
142 {
143         struct mv_mpic_softc *sc;
144         int error;
145
146         sc = (struct mv_mpic_softc *)device_get_softc(dev);
147
148         if (mv_mpic_sc != NULL)
149                 return (ENXIO);
150         mv_mpic_sc = sc;
151
152         sc->sc_dev = dev;
153
154         error = bus_alloc_resources(dev, mv_mpic_spec, sc->mpic_res);
155         if (error) {
156                 device_printf(dev, "could not allocate resources\n");
157                 return (ENXIO);
158         }
159
160         sc->mpic_bst = rman_get_bustag(sc->mpic_res[0]);
161         sc->mpic_bsh = rman_get_bushandle(sc->mpic_res[0]);
162
163         sc->cpu_bst = rman_get_bustag(sc->mpic_res[1]);
164         sc->cpu_bsh = rman_get_bushandle(sc->mpic_res[1]);
165
166         sc->drbl_bst = rman_get_bustag(sc->mpic_res[2]);
167         sc->drbl_bsh = rman_get_bushandle(sc->mpic_res[2]);
168
169         bus_space_write_4(mv_mpic_sc->mpic_bst, mv_mpic_sc->mpic_bsh,
170             MPIC_CTRL, 1);
171         MPIC_CPU_WRITE(mv_mpic_sc, MPIC_CTP, 0);
172
173         arm_unmask_msi();
174
175         return (0);
176 }
177
178 static device_method_t mv_mpic_methods[] = {
179         DEVMETHOD(device_probe,         mv_mpic_probe),
180         DEVMETHOD(device_attach,        mv_mpic_attach),
181         { 0, 0 }
182 };
183
184 static driver_t mv_mpic_driver = {
185         "mpic",
186         mv_mpic_methods,
187         sizeof(struct mv_mpic_softc),
188 };
189
190 static devclass_t mv_mpic_devclass;
191
192 DRIVER_MODULE(mpic, simplebus, mv_mpic_driver, mv_mpic_devclass, 0, 0);
193
194 int
195 arm_get_next_irq(int last)
196 {
197         u_int irq, next = -1;
198
199         irq = mv_mpic_get_cause() & IRQ_MASK;
200         CTR2(KTR_INTR, "%s: irq:%#x", __func__, irq);
201
202         if (irq != IRQ_MASK) {
203                 if (irq == MPIC_INT_ERR)
204                         irq = mv_mpic_get_cause_err();
205                 if (irq == MPIC_INT_MSI)
206                         irq = mv_mpic_get_msi();
207                 next = irq;
208         }
209
210         CTR3(KTR_INTR, "%s: last=%d, next=%d", __func__, last, next);
211         return (next);
212 }
213
214 /*
215  * XXX We can make arm_enable_irq to operate on ICE and then mask/unmask only
216  * by ISM/ICM and remove access to ICE in masking operation
217  */
218 void
219 arm_mask_irq(uintptr_t nb)
220 {
221
222         MPIC_CPU_WRITE(mv_mpic_sc, MPIC_CTP, 1);
223
224         if (nb < ERR_IRQ) {
225                 bus_space_write_4(mv_mpic_sc->mpic_bst, mv_mpic_sc->mpic_bsh,
226                     MPIC_ICE, nb);
227                 MPIC_CPU_WRITE(mv_mpic_sc, MPIC_ISM, nb);
228         } else if (nb < MSI_IRQ)
229                 arm_mask_irq_err(nb);
230 }
231
232
233 static void
234 arm_mask_irq_err(uintptr_t nb)
235 {
236         uint32_t mask;
237         uint8_t bit_off;
238
239         bit_off = nb - ERR_IRQ;
240         mask = MPIC_CPU_READ(mv_mpic_sc, MPIC_ERR_MASK);
241         mask &= ~(1 << bit_off);
242         MPIC_CPU_WRITE(mv_mpic_sc, MPIC_ERR_MASK, mask);
243 }
244
245 void
246 arm_unmask_irq(uintptr_t nb)
247 {
248
249         MPIC_CPU_WRITE(mv_mpic_sc, MPIC_CTP, 0);
250
251         if (nb < ERR_IRQ) {
252                 bus_space_write_4(mv_mpic_sc->mpic_bst, mv_mpic_sc->mpic_bsh,
253                     MPIC_ISE, nb);
254                 MPIC_CPU_WRITE(mv_mpic_sc, MPIC_ICM, nb);
255         } else if (nb < MSI_IRQ)
256                 arm_unmask_irq_err(nb);
257
258         if (nb == 0)
259                 MPIC_CPU_WRITE(mv_mpic_sc, MPIC_IN_DRBL_MASK, 0xffffffff);
260 }
261
262 void
263 arm_unmask_irq_err(uintptr_t nb)
264 {
265         uint32_t mask;
266         uint8_t bit_off;
267
268         bus_space_write_4(mv_mpic_sc->mpic_bst, mv_mpic_sc->mpic_bsh,
269             MPIC_ISE, MPIC_INT_ERR);
270         MPIC_CPU_WRITE(mv_mpic_sc, MPIC_ICM, MPIC_INT_ERR);
271
272         bit_off = nb - ERR_IRQ;
273         mask = MPIC_CPU_READ(mv_mpic_sc, MPIC_ERR_MASK);
274         mask |= (1 << bit_off);
275         MPIC_CPU_WRITE(mv_mpic_sc, MPIC_ERR_MASK, mask);
276 }
277
278 static void
279 arm_unmask_msi(void)
280 {
281
282         arm_unmask_irq(MPIC_INT_MSI);
283 }
284
285 uint32_t
286 mv_mpic_get_cause(void)
287 {
288
289         return (MPIC_CPU_READ(mv_mpic_sc, MPIC_IIACK));
290 }
291
292 uint32_t
293 mv_mpic_get_cause_err(void)
294 {
295         uint32_t err_cause;
296         uint8_t bit_off;
297
298         err_cause = bus_space_read_4(mv_mpic_sc->mpic_bst,
299             mv_mpic_sc->mpic_bsh, MPIC_ERR_CAUSE);
300
301         if (err_cause)
302                 bit_off = ffs(err_cause) - 1;
303         else
304                 return (-1);
305
306         debugf("%s: irq:%x cause:%x\n", __func__, bit_off, err_cause);
307         return (ERR_IRQ + bit_off);
308 }
309
310 uint32_t
311 mv_mpic_get_msi(void)
312 {
313         uint32_t cause;
314         uint8_t bit_off;
315
316         cause = MPIC_DRBL_READ(mv_mpic_sc, 0);
317
318         if (cause)
319                 bit_off = ffs(cause) - 1;
320         else
321                 return (-1);
322
323         debugf("%s: irq:%x cause:%x\n", __func__, bit_off, cause);
324
325         cause &= ~(1 << bit_off);
326         MPIC_DRBL_WRITE(mv_mpic_sc, 0, cause);
327
328         return (MSI_IRQ + bit_off);
329 }
330
331 int
332 mv_msi_data(int irq, uint64_t *addr, uint32_t *data)
333 {
334         u_long phys, base, size;
335         phandle_t node;
336         int error;
337
338         node = ofw_bus_get_node(mv_mpic_sc->sc_dev);
339
340         /* Get physical addres of register space */
341         error = fdt_get_range(OF_parent(node), 0, &phys, &size);
342         if (error) {
343                 printf("%s: Cannot get register physical address, err:%d",
344                     __func__, error);
345                 return (error);
346         }
347
348         /* Get offset of MPIC register space */
349         error = fdt_regsize(node, &base, &size);
350         if (error) {
351                 printf("%s: Cannot get MPIC register offset, err:%d",
352                     __func__, error);
353                 return (error);
354         }
355
356         *addr = phys + base + MPIC_SOFT_INT;
357         *data = MPIC_SOFT_INT_DRBL1 | irq;
358
359         return (0);
360 }
361
362 #if defined(SMP)
363 void
364 pic_ipi_send(cpuset_t cpus, u_int ipi)
365 {
366         uint32_t val, i;
367
368         val = 0x00000000;
369         for (i = 0; i < MAXCPU; i++)
370                 if (CPU_ISSET(i, &cpus))
371                         val |= (1 << (8 + i));
372         val |= ipi;
373         bus_space_write_4(mv_mpic_sc->mpic_bst, mv_mpic_sc->mpic_bsh,
374             MPIC_SOFT_INT, val);
375 }
376
377 int
378 pic_ipi_get(int i __unused)
379 {
380         uint32_t val;
381
382         val = MPIC_CPU_READ(mv_mpic_sc, MPIC_IN_DRBL);
383         if (val)
384                 return (ffs(val) - 1);
385
386         return (0x3ff);
387 }
388
389 void
390 pic_ipi_clear(int ipi)
391 {
392         uint32_t val;
393
394         val = ~(1 << ipi);
395         MPIC_CPU_WRITE(mv_mpic_sc, MPIC_IN_DRBL, val);
396 }
397
398 #endif