bcm2835_fbd.c revision 266022 
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 266022 2014-05-14 14:37:27Z 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/resource.h>
60#include <machine/intr.h>
61
62#include <dev/fdt/fdt_common.h>
63#include <dev/ofw/ofw_bus.h>
64#include <dev/ofw/ofw_bus_subr.h>
65
66#include <dev/fb/fbreg.h>
67#include <dev/vt/vt.h>
68
69#include <arm/broadcom/bcm2835/bcm2835_mbox.h>
70#include <arm/broadcom/bcm2835/bcm2835_vcbus.h>
71
72#include "fb_if.h"
73#include "mbox_if.h"
74
75#define FB_WIDTH		640
76#define FB_HEIGHT		480
77#define FB_DEPTH		24
78
79struct bcm_fb_config {
80	uint32_t	xres;
81	uint32_t	yres;
82	uint32_t	vxres;
83	uint32_t	vyres;
84	uint32_t	pitch;
85	uint32_t	bpp;
86	uint32_t	xoffset;
87	uint32_t	yoffset;
88	/* Filled by videocore */
89	uint32_t	base;
90	uint32_t	screen_size;
91};
92
93struct bcmsc_softc {
94	device_t		dev;
95	struct fb_info 		*info;
96	bus_dma_tag_t		dma_tag;
97	bus_dmamap_t		dma_map;
98	struct bcm_fb_config*	fb_config;
99	bus_addr_t		fb_config_phys;
100	struct intr_config_hook	init_hook;
101
102};
103
104static int bcm_fb_probe(device_t);
105static int bcm_fb_attach(device_t);
106static void bcm_fb_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nseg,
107    int err);
108
109static void
110bcm_fb_init(void *arg)
111{
112	volatile struct bcm_fb_config *fb_config;
113	struct bcmsc_softc *sc;
114	struct fb_info *info;
115	phandle_t node;
116	pcell_t cell;
117	device_t mbox;
118	device_t fbd;
119	int err = 0;
120
121	sc = arg;
122	fb_config = sc->fb_config;
123	node = ofw_bus_get_node(sc->dev);
124
125	fb_config->xres = 0;
126	fb_config->yres = 0;
127	fb_config->bpp = 0;
128	fb_config->vxres = 0;
129	fb_config->vyres = 0;
130	fb_config->xoffset = 0;
131	fb_config->yoffset = 0;
132	fb_config->base = 0;
133	fb_config->pitch = 0;
134	fb_config->screen_size = 0;
135
136	if ((OF_getprop(node, "broadcom,width", &cell, sizeof(cell))) > 0)
137		fb_config->xres = (int)fdt32_to_cpu(cell);
138	if (fb_config->xres == 0)
139		fb_config->xres = FB_WIDTH;
140
141	if ((OF_getprop(node, "broadcom,height", &cell, sizeof(cell))) > 0)
142		fb_config->yres = (uint32_t)fdt32_to_cpu(cell);
143	if (fb_config->yres == 0)
144		fb_config->yres = FB_HEIGHT;
145
146	if ((OF_getprop(node, "broadcom,depth", &cell, sizeof(cell))) > 0)
147		fb_config->bpp = (uint32_t)fdt32_to_cpu(cell);
148	if (fb_config->bpp == 0)
149		fb_config->bpp = FB_DEPTH;
150
151	bus_dmamap_sync(sc->dma_tag, sc->dma_map,
152		BUS_DMASYNC_PREWRITE | BUS_DMASYNC_PREREAD);
153
154	mbox = devclass_get_device(devclass_find("mbox"), 0);
155	if (mbox) {
156		MBOX_WRITE(mbox, BCM2835_MBOX_CHAN_FB, sc->fb_config_phys);
157		MBOX_READ(mbox, BCM2835_MBOX_CHAN_FB, &err);
158	}
159	bus_dmamap_sync(sc->dma_tag, sc->dma_map,
160		BUS_DMASYNC_POSTREAD);
161
162	if (fb_config->base != 0) {
163		device_printf(sc->dev, "%dx%d(%dx%d@%d,%d) %dbpp\n",
164			fb_config->xres, fb_config->yres,
165			fb_config->vxres, fb_config->vyres,
166			fb_config->xoffset, fb_config->yoffset,
167			fb_config->bpp);
168
169
170		device_printf(sc->dev, "pitch %d, base 0x%08x, screen_size %d\n",
171			fb_config->pitch, fb_config->base,
172			fb_config->screen_size);
173
174
175
176
177		info = malloc(sizeof(struct fb_info), M_DEVBUF,
178		    M_WAITOK | M_ZERO);
179		info->fb_name = device_get_nameunit(sc->dev);
180		info->fb_vbase = (intptr_t)pmap_mapdev(fb_config->base,
181		    fb_config->screen_size);
182		info->fb_pbase = fb_config->base;
183		info->fb_size = fb_config->screen_size;
184		info->fb_bpp = info->fb_depth = fb_config->bpp;
185		info->fb_stride = fb_config->pitch;
186		info->fb_width = fb_config->xres;
187		info->fb_height = fb_config->yres;
188
189		sc->info = info;
190
191		fbd = device_add_child(sc->dev, "fbd",
192		    device_get_unit(sc->dev));
193		if (fbd == NULL) {
194			device_printf(sc->dev, "Failed to add fbd child\n");
195			return;
196		}
197		if (device_probe_and_attach(fbd) != 0) {
198			device_printf(sc->dev, "Failed to attach fbd device\n");
199			return;
200		}
201
202
203	} else {
204		device_printf(sc->dev, "Failed to set framebuffer info\n");
205		return;
206	}
207
208	config_intrhook_disestablish(&sc->init_hook);
209}
210
211static int
212bcm_fb_probe(device_t dev)
213{
214	if (!ofw_bus_is_compatible(dev, "broadcom,bcm2835-fb"))
215		return (ENXIO);
216
217	device_set_desc(dev, "BCM2835 VT framebuffer driver");
218
219	return (BUS_PROBE_DEFAULT);
220}
221
222static int
223bcm_fb_attach(device_t dev)
224{
225	struct bcmsc_softc *sc = device_get_softc(dev);
226	int dma_size = sizeof(struct bcm_fb_config);
227	int err;
228
229	sc->dev = dev;
230
231	err = bus_dma_tag_create(
232	    bus_get_dma_tag(sc->dev),
233	    PAGE_SIZE, 0,		/* alignment, boundary */
234	    BUS_SPACE_MAXADDR_32BIT,	/* lowaddr */
235	    BUS_SPACE_MAXADDR,		/* highaddr */
236	    NULL, NULL,			/* filter, filterarg */
237	    dma_size, 1,		/* maxsize, nsegments */
238	    dma_size, 0,		/* maxsegsize, flags */
239	    NULL, NULL,			/* lockfunc, lockarg */
240	    &sc->dma_tag);
241
242	err = bus_dmamem_alloc(sc->dma_tag, (void **)&sc->fb_config, 0,
243	    &sc->dma_map);
244	if (err) {
245		device_printf(dev, "cannot allocate framebuffer\n");
246		goto fail;
247	}
248
249	err = bus_dmamap_load(sc->dma_tag, sc->dma_map, sc->fb_config,
250	    dma_size, bcm_fb_dmamap_cb, &sc->fb_config_phys, BUS_DMA_NOWAIT);
251
252	if (err) {
253		device_printf(dev, "cannot load DMA map\n");
254		goto fail;
255	}
256
257	/*
258	 * We have to wait until interrupts are enabled.
259	 * Mailbox relies on it to get data from VideoCore
260	 */
261        sc->init_hook.ich_func = bcm_fb_init;
262        sc->init_hook.ich_arg = sc;
263
264        if (config_intrhook_establish(&sc->init_hook) != 0) {
265		device_printf(dev, "failed to establish intrhook\n");
266                return (ENOMEM);
267	}
268
269	return (0);
270
271fail:
272	return (ENXIO);
273}
274
275
276static void
277bcm_fb_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nseg, int err)
278{
279	bus_addr_t *addr;
280
281	if (err)
282		return;
283
284	addr = (bus_addr_t*)arg;
285	*addr = PHYS_TO_VCBUS(segs[0].ds_addr);
286}
287
288static struct fb_info *
289bcm_fb_helper_getinfo(device_t dev)
290{
291	struct bcmsc_softc *sc;
292
293	sc = device_get_softc(dev);
294
295	return (sc->info);
296}
297
298static device_method_t bcm_fb_methods[] = {
299	/* Device interface */
300	DEVMETHOD(device_probe,		bcm_fb_probe),
301	DEVMETHOD(device_attach,	bcm_fb_attach),
302
303	/* Framebuffer service methods */
304	DEVMETHOD(fb_getinfo,		bcm_fb_helper_getinfo),
305
306	DEVMETHOD_END
307};
308
309static devclass_t bcm_fb_devclass;
310
311static driver_t bcm_fb_driver = {
312	"fb",
313	bcm_fb_methods,
314	sizeof(struct bcmsc_softc),
315};
316
317DRIVER_MODULE(bcm2835fb, nexus, bcm_fb_driver, bcm_fb_devclass, 0, 0);
318