bcm2835_fbd.c revision 266160 
1/*-
2 * Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@freebsd.org>
3 * Copyright (c) 2012, 2013 The FreeBSD Foundation
4 * All rights reserved.
5 *
6 * Portions of this software were developed by Oleksandr Rybalko
7 * under sponsorship from the FreeBSD Foundation.
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 AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 */
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD: stable/10/sys/arm/broadcom/bcm2835/bcm2835_fbd.c 266160 2014-05-15 17:30:16Z ian $");
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/bio.h>
37#include <sys/bus.h>
38#include <sys/conf.h>
39#include <sys/endian.h>
40#include <sys/kernel.h>
41#include <sys/kthread.h>
42#include <sys/lock.h>
43#include <sys/malloc.h>
44#include <sys/module.h>
45#include <sys/mutex.h>
46#include <sys/queue.h>
47#include <sys/resource.h>
48#include <sys/rman.h>
49#include <sys/time.h>
50#include <sys/timetc.h>
51#include <sys/fbio.h>
52#include <sys/consio.h>
53
54#include <sys/kdb.h>
55
56#include <machine/bus.h>
57#include <machine/cpu.h>
58#include <machine/cpufunc.h>
59#include <machine/fdt.h>
60#include <machine/resource.h>
61#include <machine/intr.h>
62
63#include <dev/fdt/fdt_common.h>
64#include <dev/ofw/ofw_bus.h>
65#include <dev/ofw/ofw_bus_subr.h>
66
67#include <dev/fb/fbreg.h>
68#include <dev/vt/vt.h>
69
70#include <arm/broadcom/bcm2835/bcm2835_mbox.h>
71#include <arm/broadcom/bcm2835/bcm2835_vcbus.h>
72
73#include "fb_if.h"
74#include "mbox_if.h"
75
76#define FB_WIDTH		640
77#define FB_HEIGHT		480
78#define FB_DEPTH		24
79
80struct bcm_fb_config {
81	uint32_t	xres;
82	uint32_t	yres;
83	uint32_t	vxres;
84	uint32_t	vyres;
85	uint32_t	pitch;
86	uint32_t	bpp;
87	uint32_t	xoffset;
88	uint32_t	yoffset;
89	/* Filled by videocore */
90	uint32_t	base;
91	uint32_t	screen_size;
92};
93
94struct bcmsc_softc {
95	device_t		dev;
96	struct fb_info 		*info;
97	bus_dma_tag_t		dma_tag;
98	bus_dmamap_t		dma_map;
99	struct bcm_fb_config*	fb_config;
100	bus_addr_t		fb_config_phys;
101	struct intr_config_hook	init_hook;
102
103};
104
105static int bcm_fb_probe(device_t);
106static int bcm_fb_attach(device_t);
107static void bcm_fb_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nseg,
108    int err);
109
110static void
111bcm_fb_init(void *arg)
112{
113	volatile struct bcm_fb_config *fb_config;
114	struct bcmsc_softc *sc;
115	struct fb_info *info;
116	phandle_t node;
117	pcell_t cell;
118	device_t mbox;
119	device_t fbd;
120	int err = 0;
121
122	sc = arg;
123	fb_config = sc->fb_config;
124	node = ofw_bus_get_node(sc->dev);
125
126	fb_config->xres = 0;
127	fb_config->yres = 0;
128	fb_config->bpp = 0;
129	fb_config->vxres = 0;
130	fb_config->vyres = 0;
131	fb_config->xoffset = 0;
132	fb_config->yoffset = 0;
133	fb_config->base = 0;
134	fb_config->pitch = 0;
135	fb_config->screen_size = 0;
136
137	if ((OF_getprop(node, "broadcom,width", &cell, sizeof(cell))) > 0)
138		fb_config->xres = (int)fdt32_to_cpu(cell);
139	if (fb_config->xres == 0)
140		fb_config->xres = FB_WIDTH;
141
142	if ((OF_getprop(node, "broadcom,height", &cell, sizeof(cell))) > 0)
143		fb_config->yres = (uint32_t)fdt32_to_cpu(cell);
144	if (fb_config->yres == 0)
145		fb_config->yres = FB_HEIGHT;
146
147	if ((OF_getprop(node, "broadcom,depth", &cell, sizeof(cell))) > 0)
148		fb_config->bpp = (uint32_t)fdt32_to_cpu(cell);
149	if (fb_config->bpp == 0)
150		fb_config->bpp = FB_DEPTH;
151
152	bus_dmamap_sync(sc->dma_tag, sc->dma_map,
153		BUS_DMASYNC_PREWRITE | BUS_DMASYNC_PREREAD);
154
155	mbox = devclass_get_device(devclass_find("mbox"), 0);
156	if (mbox) {
157		MBOX_WRITE(mbox, BCM2835_MBOX_CHAN_FB, sc->fb_config_phys);
158		MBOX_READ(mbox, BCM2835_MBOX_CHAN_FB, &err);
159	}
160	bus_dmamap_sync(sc->dma_tag, sc->dma_map,
161		BUS_DMASYNC_POSTREAD);
162
163	if (fb_config->base != 0) {
164		device_printf(sc->dev, "%dx%d(%dx%d@%d,%d) %dbpp\n",
165			fb_config->xres, fb_config->yres,
166			fb_config->vxres, fb_config->vyres,
167			fb_config->xoffset, fb_config->yoffset,
168			fb_config->bpp);
169
170
171		device_printf(sc->dev, "pitch %d, base 0x%08x, screen_size %d\n",
172			fb_config->pitch, fb_config->base,
173			fb_config->screen_size);
174
175
176
177
178		info = malloc(sizeof(struct fb_info), M_DEVBUF,
179		    M_WAITOK | M_ZERO);
180		info->fb_name = device_get_nameunit(sc->dev);
181		info->fb_vbase = (intptr_t)pmap_mapdev(fb_config->base,
182		    fb_config->screen_size);
183		info->fb_pbase = fb_config->base;
184		info->fb_size = fb_config->screen_size;
185		info->fb_bpp = info->fb_depth = fb_config->bpp;
186		info->fb_stride = fb_config->pitch;
187		info->fb_width = fb_config->xres;
188		info->fb_height = fb_config->yres;
189
190		sc->info = info;
191
192		fbd = device_add_child(sc->dev, "fbd",
193		    device_get_unit(sc->dev));
194		if (fbd == NULL) {
195			device_printf(sc->dev, "Failed to add fbd child\n");
196			return;
197		}
198		if (device_probe_and_attach(fbd) != 0) {
199			device_printf(sc->dev, "Failed to attach fbd device\n");
200			return;
201		}
202
203
204	} else {
205		device_printf(sc->dev, "Failed to set framebuffer info\n");
206		return;
207	}
208
209	config_intrhook_disestablish(&sc->init_hook);
210}
211
212static int
213bcm_fb_probe(device_t dev)
214{
215	if (!ofw_bus_is_compatible(dev, "broadcom,bcm2835-fb"))
216		return (ENXIO);
217
218	device_set_desc(dev, "BCM2835 VT framebuffer driver");
219
220	return (BUS_PROBE_DEFAULT);
221}
222
223static int
224bcm_fb_attach(device_t dev)
225{
226	struct bcmsc_softc *sc = device_get_softc(dev);
227	int dma_size = sizeof(struct bcm_fb_config);
228	int err;
229
230	sc->dev = dev;
231
232	err = bus_dma_tag_create(
233	    bus_get_dma_tag(sc->dev),
234	    PAGE_SIZE, 0,		/* alignment, boundary */
235	    BUS_SPACE_MAXADDR_32BIT,	/* lowaddr */
236	    BUS_SPACE_MAXADDR,		/* highaddr */
237	    NULL, NULL,			/* filter, filterarg */
238	    dma_size, 1,		/* maxsize, nsegments */
239	    dma_size, 0,		/* maxsegsize, flags */
240	    NULL, NULL,			/* lockfunc, lockarg */
241	    &sc->dma_tag);
242
243	err = bus_dmamem_alloc(sc->dma_tag, (void **)&sc->fb_config, 0,
244	    &sc->dma_map);
245	if (err) {
246		device_printf(dev, "cannot allocate framebuffer\n");
247		goto fail;
248	}
249
250	err = bus_dmamap_load(sc->dma_tag, sc->dma_map, sc->fb_config,
251	    dma_size, bcm_fb_dmamap_cb, &sc->fb_config_phys, BUS_DMA_NOWAIT);
252
253	if (err) {
254		device_printf(dev, "cannot load DMA map\n");
255		goto fail;
256	}
257
258	/*
259	 * We have to wait until interrupts are enabled.
260	 * Mailbox relies on it to get data from VideoCore
261	 */
262        sc->init_hook.ich_func = bcm_fb_init;
263        sc->init_hook.ich_arg = sc;
264
265        if (config_intrhook_establish(&sc->init_hook) != 0) {
266		device_printf(dev, "failed to establish intrhook\n");
267                return (ENOMEM);
268	}
269
270	return (0);
271
272fail:
273	return (ENXIO);
274}
275
276
277static void
278bcm_fb_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nseg, int err)
279{
280	bus_addr_t *addr;
281
282	if (err)
283		return;
284
285	addr = (bus_addr_t*)arg;
286	*addr = PHYS_TO_VCBUS(segs[0].ds_addr);
287}
288
289static struct fb_info *
290bcm_fb_helper_getinfo(device_t dev)
291{
292	struct bcmsc_softc *sc;
293
294	sc = device_get_softc(dev);
295
296	return (sc->info);
297}
298
299static device_method_t bcm_fb_methods[] = {
300	/* Device interface */
301	DEVMETHOD(device_probe,		bcm_fb_probe),
302	DEVMETHOD(device_attach,	bcm_fb_attach),
303
304	/* Framebuffer service methods */
305	DEVMETHOD(fb_getinfo,		bcm_fb_helper_getinfo),
306
307	DEVMETHOD_END
308};
309
310static devclass_t bcm_fb_devclass;
311
312static driver_t bcm_fb_driver = {
313	"fb",
314	bcm_fb_methods,
315	sizeof(struct bcmsc_softc),
316};
317
318DRIVER_MODULE(bcm2835fb, ofwbus, bcm_fb_driver, bcm_fb_devclass, 0, 0);
319