2 * carl9170 firmware - used by the ar9170 wireless device
4 * DMA descriptor handling functions
6 * Copyright (c) 2000-2005 ZyDAS Technology Corporation
7 * Copyright (c) 2007-2009 Atheros Communications, Inc.
8 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
9 * Copyright 2009-2011 Christian Lamparter <chunkeey@googlemail.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License along
22 * with this program; if not, write to the Free Software Foundation, Inc.,
23 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
30 struct ar9170_dma_memory dma_mem __section(sram);
32 static void copy_dma_desc(struct dma_desc *dst,
35 memcpy(dst, src, sizeof(struct dma_desc));
38 static void clear_descriptor(struct dma_desc *d)
40 d->status = AR9170_OWN_BITS_SW;
49 static void fill_descriptor(struct dma_desc *d, uint16_t size, uint8_t *data)
51 d->status = AR9170_OWN_BITS_SW;
61 * - Init up_queue, down_queue, tx_queue[5], rx_queue.
62 * - Setup descriptors and data buffer address.
63 * - Ring descriptors rx_queue and down_queue by dma_reclaim().
65 * NOTE: LastAddr tempary point (same) to nextAddr after initialize.
66 * Because LastAddr is don't care in function dma_reclaim().
68 void dma_init_descriptors(void)
72 for (i = 0; i < ARRAY_SIZE(dma_mem.terminator); i++)
73 clear_descriptor(&dma_mem.terminator[i]);
75 /* Assign terminators to DMA queues */
77 fw.pta.up_queue.head = fw.pta.up_queue.terminator = &dma_mem.terminator[i++];
78 fw.pta.down_queue.head = fw.pta.down_queue.terminator = &dma_mem.terminator[i++];
79 for (j = 0; j < __AR9170_NUM_TX_QUEUES; j++)
80 fw.wlan.tx_queue[j].head = fw.wlan.tx_queue[j].terminator = &dma_mem.terminator[i++];
81 fw.wlan.tx_retry.head = fw.wlan.tx_retry.terminator = &dma_mem.terminator[i++];
82 fw.wlan.rx_queue.head = fw.wlan.rx_queue.terminator = &dma_mem.terminator[i++];
83 fw.usb.int_desc = &dma_mem.terminator[i++];
84 fw.wlan.fw_desc = &dma_mem.terminator[i++];
86 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
87 for (j = 0; j < CARL9170_INTF_NUM; j++)
88 fw.wlan.cab_queue[j].head = fw.wlan.cab_queue[j].terminator = &dma_mem.terminator[i++];
89 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
91 BUILD_BUG_ON(AR9170_TERMINATOR_NUMBER != j);
93 DBG("Blocks:%d [tx:%d, rx:%d] Terminators:%d/%d\n",
94 AR9170_BLOCK_NUMBER, AR9170_TX_BLOCK_NUMBER,
95 AR9170_RX_BLOCK_NUMBER, AR9170_TERMINATOR_NUMBER, i);
97 /* Init descriptors and memory blocks */
98 for (i = 0; i < AR9170_BLOCK_NUMBER; i++) {
99 fill_descriptor(&dma_mem.block[i], AR9170_BLOCK_SIZE, dma_mem.data[i].data);
101 if (i < AR9170_TX_BLOCK_NUMBER)
102 dma_reclaim(&fw.pta.down_queue, &dma_mem.block[i]);
104 dma_reclaim(&fw.wlan.rx_queue, &dma_mem.block[i]);
107 /* Set DMA address registers */
108 set(AR9170_PTA_REG_DN_DMA_ADDRH, (uint32_t) fw.pta.down_queue.head >> 16);
109 set(AR9170_PTA_REG_DN_DMA_ADDRL, (uint32_t) fw.pta.down_queue.head & 0xffff);
110 set(AR9170_PTA_REG_UP_DMA_ADDRH, (uint32_t) fw.pta.up_queue.head >> 16);
111 set(AR9170_PTA_REG_UP_DMA_ADDRL, (uint32_t) fw.pta.up_queue.head & 0xffff);
113 for (i = 0; i < __AR9170_NUM_TX_QUEUES; i++)
114 set_wlan_txq_dma_addr(i, (uint32_t) fw.wlan.tx_queue[i].head);
116 set(AR9170_MAC_REG_DMA_RXQ_ADDR, (uint32_t) fw.wlan.rx_queue.head);
117 fw.usb.int_desc->dataSize = AR9170_BLOCK_SIZE;
118 fw.usb.int_desc->dataAddr = (void *) &dma_mem.reserved.rsp;
120 memset(DESC_PAYLOAD(fw.usb.int_desc), 0xff,
121 AR9170_INT_MAGIC_HEADER_SIZE);
122 memset(DESC_PAYLOAD_OFF(fw.usb.int_desc, AR9170_INT_MAGIC_HEADER_SIZE),
123 0, AR9170_BLOCK_SIZE - AR9170_INT_MAGIC_HEADER_SIZE);
125 /* rsp is now available for use */
126 fw.usb.int_desc_available = 1;
128 memset(DESC_PAYLOAD(fw.wlan.fw_desc), 0, 128);
129 fw.wlan.fw_desc_available = 1;
135 * Exchange the terminator and the first descriptor of the packet
136 * for hardware ascy...
138 void dma_reclaim(struct dma_queue *q, struct dma_desc *desc)
140 struct dma_desc *tmpDesc, *last;
141 struct dma_desc tdesc;
143 /* 1. Set OWN bit to HW for all TDs to be added, clear ctrl and size */
145 last = desc->lastAddr;
148 tmpDesc->status = AR9170_OWN_BITS_HW;
150 tmpDesc->totalLen = 0;
151 tmpDesc->dataSize = AR9170_BLOCK_SIZE;
153 /* TODO : Exception handle */
155 tmpDesc->lastAddr = tmpDesc;
160 tmpDesc = tmpDesc->nextAddr;
163 /* 2. Next address of Last TD to be added = first TD */
164 tmpDesc->nextAddr = desc;
166 /* Link first TD to self */
167 desc->lastAddr = q->terminator;
169 /* 3. Copy first TD to be added to TTD */
170 copy_dma_desc(&tdesc, desc);
172 /* 4. Initialize new terminator */
173 clear_descriptor(desc);
175 /* 5. Copy TTD to last TD */
177 copy_dma_desc((void *)q->terminator, (void *)&tdesc);
178 q->terminator->status |= AR9170_OWN_BITS_HW;
180 /* Update terminator pointer */
181 q->terminator = desc;
185 * Put a complete packet into the tail of the Queue q.
186 * Exchange the terminator and the first descriptor of the packet
187 * for hardware ascy...
189 void dma_put(struct dma_queue *q, struct dma_desc *desc)
191 struct dma_desc *tmpDesc;
192 struct dma_desc tdesc;
197 /* update totalLen */
198 tmpDesc->totalLen = desc->totalLen;
200 /* 1. Set OWN bit to HW for all TDs to be added */
201 tmpDesc->status = AR9170_OWN_BITS_HW;
202 /* TODO : Exception handle */
204 tmpDesc->lastAddr = desc->lastAddr;
206 if (desc->lastAddr == tmpDesc)
209 tmpDesc = tmpDesc->nextAddr;
212 /* 2. Next address of Last TD to be added = first TD */
213 desc->lastAddr->nextAddr = desc;
215 /* If there is only one descriptor, update pointer of last descriptor */
216 if (desc->lastAddr == desc)
217 desc->lastAddr = q->terminator;
219 /* 3. Copy first TD to be added to TTD */
220 copy_dma_desc(&tdesc, desc);
222 /* 4. Initialize new terminator */
223 clear_descriptor(desc);
225 /* 5. Copy TTD to last TD */
226 tdesc.status &= (~AR9170_OWN_BITS);
227 copy_dma_desc((void *)q->terminator, (void *)&tdesc);
228 q->terminator->status |= AR9170_OWN_BITS_HW;
230 /* Update terminator pointer */
231 q->terminator = desc;
234 struct dma_desc *dma_unlink_head(struct dma_queue *queue)
236 struct dma_desc *desc;
238 if (queue_empty(queue))
243 queue->head = desc->lastAddr->nextAddr;
245 /* poison nextAddr address */
246 desc->lastAddr->nextAddr = desc->lastAddr;
247 desc->lastAddr->lastAddr = desc->lastAddr;