/lib/firmware/carl9170fw/carlfw/src/hostif.c is in linux-firmware 1.127.24.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 | /*
* carl9170 firmware - used by the ar9170 wireless device
*
* Host interface routines
*
* Copyright (c) 2000-2005 ZyDAS Technology Corporation
* Copyright (c) 2007-2009 Atheros Communications, Inc.
* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
* Copyright 2009-2011 Christian Lamparter <chunkeey@googlemail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "carl9170.h"
#include "hostif.h"
#include "printf.h"
#include "wl.h"
static bool length_check(struct dma_desc *desc)
{
volatile struct carl9170_tx_superframe *super = __get_super(desc);
if (unlikely(desc->totalLen < sizeof(struct carl9170_tx_superdesc)))
return false;
/*
* check if the DMA is complete, or clipped.
*
* NB: The hardware aligns the descriptor length to
* a 4 byte boundary. This makes the direct comparison
* difficult, or unnecessary complex for a hot-path.
*/
if (unlikely(super->s.len > desc->totalLen))
return false;
return true;
}
static void handle_download(void)
{
struct dma_desc *desc;
/*
* Under normal conditions, all completed descs should have
* the AR9170_OWN_BITS_SE status flag set.
* However there seems to be a undocumented case where the flag
* is _SW ( handle_download_exception )
*/
for_each_desc_not_bits(desc, &fw.pta.down_queue, AR9170_OWN_BITS_HW) {
if (unlikely((length_check(desc) == false))) {
/*
* There is no easy way of telling what was lost.
*
* Therefore we just reclaim the data.
* The driver has to have some sort frame
* timeout mechanism.
*/
wlan_tx_complete(__get_super(desc), false);
dma_reclaim(&fw.pta.down_queue, desc);
down_trigger();
} else {
wlan_tx(desc);
}
}
#ifdef CONFIG_CARL9170FW_DEBUG_LED_HEARTBEAT
xorl(AR9170_GPIO_REG_PORT_DATA, 2);
#endif /* CONFIG_CARL9170FW_DEBUG_LED_HEARTBEAT */
}
static void handle_upload(void)
{
struct dma_desc *desc;
for_each_desc_not_bits(desc, &fw.pta.up_queue, AR9170_OWN_BITS_HW) {
/*
* BIG FAT NOTE:
*
* DO NOT compare the descriptor addresses.
*/
if (DESC_PAYLOAD(desc) == (void *) &dma_mem.reserved.rsp) {
fw.usb.int_desc = desc;
fw.usb.int_desc_available = 1;
} else {
dma_reclaim(&fw.wlan.rx_queue, desc);
wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
}
}
#ifdef CONFIG_CARL9170FW_DEBUG_LED_HEARTBEAT
xorl(AR9170_GPIO_REG_PORT_DATA, 2);
#endif /* CONFIG_CARL9170FW_DEBUG_LED_HEARTBEAT */
}
static void handle_download_exception(void)
{
struct dma_desc *desc, *target;
/* actually, the queue should be stopped by now? */
usb_stop_down_queue();
target = (void *)((get(AR9170_PTA_REG_DN_CURR_ADDRH) << 16) |
get(AR9170_PTA_REG_DN_CURR_ADDRL));
/*
* Put "forgotten" packets from the head of the queue, back
* to the current position
*/
__while_desc_bits(desc, &fw.pta.down_queue, AR9170_OWN_BITS_HW) {
if (desc == target)
break;
dma_reclaim(&fw.pta.down_queue,
dma_unlink_head(&fw.pta.down_queue));
}
__for_each_desc_continue(desc, &fw.pta.down_queue) {
if ((desc->status & AR9170_OWN_BITS) == AR9170_OWN_BITS_SW)
dma_fix_downqueue(desc);
}
usb_start_down_queue();
down_trigger();
}
/* handle interrupts from DMA chip */
void handle_host_interface(void)
{
uint32_t pta_int;
pta_int = get(AR9170_PTA_REG_INT_FLAG);
#define HANDLER(intr, flag, func) \
do { \
if ((intr & flag) != 0) { \
func(); \
} \
} while (0)
HANDLER(pta_int, AR9170_PTA_INT_FLAG_DN, handle_download);
HANDLER(pta_int, AR9170_PTA_INT_FLAG_UP, handle_upload);
/* This is just guesswork and MAGIC */
pta_int = get(AR9170_PTA_REG_DMA_STATUS);
HANDLER(pta_int, 0x1, handle_download_exception);
#undef HANDLER
}
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