diff options
Diffstat (limited to 'carl9170fw/carlfw/src/hostif.c')
| -rw-r--r-- | carl9170fw/carlfw/src/hostif.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/carl9170fw/carlfw/src/hostif.c b/carl9170fw/carlfw/src/hostif.c new file mode 100644 index 0000000..e445d5f --- /dev/null +++ b/carl9170fw/carlfw/src/hostif.c @@ -0,0 +1,165 @@ +/* + * 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 +} |