| 1 | /*
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| 2 | * Copyright (c) 2013 Beniamino Galvani
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 | /** @addtogroup genarch
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| 29 | * @{
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| 30 | */
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| 31 | /**
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| 32 | * @file
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| 33 | * @brief BCM2835 mailbox communication routines
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| 34 | */
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| 35 |
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| 36 | #include <mm/km.h>
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| 37 | #include <typedefs.h>
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| 38 | #include <genarch/drivers/bcm2835/mbox.h>
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| 39 |
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| 40 | static void mbox_write(bcm2835_mbox_t *mbox, uint8_t chan, uint32_t value)
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| 41 | {
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| 42 | while (mbox->status & MBOX_STATUS_FULL) ;
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| 43 | mbox->write = MBOX_COMPOSE(chan, value);
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| 44 | }
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| 45 |
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| 46 | static uint32_t mbox_read(bcm2835_mbox_t *mbox, uint8_t chan)
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| 47 | {
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| 48 | uint32_t msg;
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| 49 |
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| 50 | do {
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| 51 | while (mbox->status & MBOX_STATUS_EMPTY) ;
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| 52 | msg = mbox->read;
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| 53 | } while (MBOX_MSG_CHAN(msg) != chan);
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| 54 |
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| 55 | return MBOX_MSG_VALUE(msg);
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| 56 | }
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| 57 |
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| 58 | bool bcm2835_prop_get_memory(uint32_t *base, uint32_t *size)
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| 59 | {
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| 60 | bool ret;
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| 61 | MBOX_BUFF_ALLOC(req, mbox_getmem_buf_t);
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| 62 |
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| 63 | req->buf_hdr.size = sizeof(mbox_getmem_buf_t);
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| 64 | req->buf_hdr.code = MBOX_PROP_CODE_REQ;
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| 65 | req->tag_hdr.tag_id = TAG_GET_ARM_MEMORY;
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| 66 | req->tag_hdr.buf_size = sizeof(mbox_tag_getmem_resp_t);
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| 67 | req->tag_hdr.val_len = 0;
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| 68 | req->zero = 0;
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| 69 |
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| 70 | mbox_write((bcm2835_mbox_t *)BCM2835_MBOX0_ADDR,
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| 71 | MBOX_CHAN_PROP_A2V, KA2VCA((uint32_t)req));
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| 72 | mbox_read((bcm2835_mbox_t *)BCM2835_MBOX0_ADDR,
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| 73 | MBOX_CHAN_PROP_A2V);
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| 74 |
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| 75 | if (req->buf_hdr.code == MBOX_PROP_CODE_RESP_OK) {
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| 76 | *base = req->data.base;
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| 77 | *size = req->data.size;
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| 78 | ret = true;
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| 79 | } else {
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| 80 | ret = false;
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| 81 | }
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| 82 |
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| 83 | return ret;
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| 84 | }
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| 85 |
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| 86 | bool bcm2835_fb_init(fb_properties_t *prop)
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| 87 | {
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| 88 | bcm2835_mbox_t *fb_mbox;
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| 89 | bool ret = false;
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| 90 | MBOX_BUFF_ALLOC(fb_desc, bcm2835_fb_desc_t);
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| 91 |
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| 92 | fb_mbox = (void *) km_map(BCM2835_MBOX0_ADDR, sizeof(bcm2835_mbox_t),
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| 93 | PAGE_NOT_CACHEABLE);
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| 94 |
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| 95 | fb_desc->width = 640;
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| 96 | fb_desc->height = 480;
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| 97 | fb_desc->virt_width = fb_desc->width;
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| 98 | fb_desc->virt_height = fb_desc->height;
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| 99 | fb_desc->pitch = 0; /* Set by VC */
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| 100 | fb_desc->bpp = 16;
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| 101 | fb_desc->x_offset = 0;
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| 102 | fb_desc->y_offset = 0;
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| 103 | fb_desc->addr = 0; /* Set by VC */
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| 104 | fb_desc->size = 0; /* Set by VC */
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| 105 |
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| 106 | mbox_write(fb_mbox, MBOX_CHAN_FB, KA2VCA(fb_desc));
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| 107 |
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| 108 | if (mbox_read(fb_mbox, MBOX_CHAN_FB)) {
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| 109 | printf("BCM2835 framebuffer initialization failed\n");
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| 110 | goto out;
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| 111 | }
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| 112 |
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| 113 | prop->addr = fb_desc->addr;
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| 114 | prop->offset = 0;
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| 115 | prop->x = fb_desc->width;
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| 116 | prop->y = fb_desc->height;
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| 117 | prop->scan = fb_desc->pitch;
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| 118 | prop->visual = VISUAL_RGB_5_6_5_LE;
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| 119 |
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| 120 | printf("BCM2835 framebuffer at 0x%08x (%dx%d)\n", prop->addr,
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| 121 | prop->x, prop->y);
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| 122 | ret = true;
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| 123 | out:
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| 124 | km_unmap((uintptr_t)fb_mbox, sizeof(bcm2835_mbox_t));
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| 125 | return ret;
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| 126 | }
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| 127 |
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| 128 | /**
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| 129 | * @}
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| 130 | */
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