2 Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
3 <http://rt2x00.serialmonkey.com>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, see <http://www.gnu.org/licenses/>.
21 Abstract: rt2x00 generic mmio device routines.
24 #include <linux/dma-mapping.h>
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/slab.h>
30 #include "rt2x00mmio.h"
35 int rt2x00mmio_regbusy_read(struct rt2x00_dev
*rt2x00dev
,
36 const unsigned int offset
,
37 const struct rt2x00_field32 field
,
42 if (!test_bit(DEVICE_STATE_PRESENT
, &rt2x00dev
->flags
))
45 for (i
= 0; i
< REGISTER_BUSY_COUNT
; i
++) {
46 *reg
= rt2x00mmio_register_read(rt2x00dev
, offset
);
47 if (!rt2x00_get_field32(*reg
, field
))
49 udelay(REGISTER_BUSY_DELAY
);
52 printk_once(KERN_ERR
"%s() Indirect register access failed: "
53 "offset=0x%.08x, value=0x%.08x\n", __func__
, offset
, *reg
);
58 EXPORT_SYMBOL_GPL(rt2x00mmio_regbusy_read
);
60 bool rt2x00mmio_rxdone(struct rt2x00_dev
*rt2x00dev
)
62 struct data_queue
*queue
= rt2x00dev
->rx
;
63 struct queue_entry
*entry
;
64 struct queue_entry_priv_mmio
*entry_priv
;
65 struct skb_frame_desc
*skbdesc
;
69 entry
= rt2x00queue_get_entry(queue
, Q_INDEX
);
70 entry_priv
= entry
->priv_data
;
72 if (rt2x00dev
->ops
->lib
->get_entry_state(entry
))
76 * Fill in desc fields of the skb descriptor
78 skbdesc
= get_skb_frame_desc(entry
->skb
);
79 skbdesc
->desc
= entry_priv
->desc
;
80 skbdesc
->desc_len
= entry
->queue
->desc_size
;
83 * DMA is already done, notify rt2x00lib that
84 * it finished successfully.
86 rt2x00lib_dmastart(entry
);
87 rt2x00lib_dmadone(entry
);
90 * Send the frame to rt2x00lib for further processing.
92 rt2x00lib_rxdone(entry
, GFP_ATOMIC
);
97 EXPORT_SYMBOL_GPL(rt2x00mmio_rxdone
);
99 void rt2x00mmio_flush_queue(struct data_queue
*queue
, bool drop
)
103 for (i
= 0; !rt2x00queue_empty(queue
) && i
< 10; i
++)
106 EXPORT_SYMBOL_GPL(rt2x00mmio_flush_queue
);
109 * Device initialization handlers.
111 static int rt2x00mmio_alloc_queue_dma(struct rt2x00_dev
*rt2x00dev
,
112 struct data_queue
*queue
)
114 struct queue_entry_priv_mmio
*entry_priv
;
120 * Allocate DMA memory for descriptor and buffer.
122 addr
= dma_zalloc_coherent(rt2x00dev
->dev
,
123 queue
->limit
* queue
->desc_size
, &dma
,
129 * Initialize all queue entries to contain valid addresses.
131 for (i
= 0; i
< queue
->limit
; i
++) {
132 entry_priv
= queue
->entries
[i
].priv_data
;
133 entry_priv
->desc
= addr
+ i
* queue
->desc_size
;
134 entry_priv
->desc_dma
= dma
+ i
* queue
->desc_size
;
140 static void rt2x00mmio_free_queue_dma(struct rt2x00_dev
*rt2x00dev
,
141 struct data_queue
*queue
)
143 struct queue_entry_priv_mmio
*entry_priv
=
144 queue
->entries
[0].priv_data
;
146 if (entry_priv
->desc
)
147 dma_free_coherent(rt2x00dev
->dev
,
148 queue
->limit
* queue
->desc_size
,
149 entry_priv
->desc
, entry_priv
->desc_dma
);
150 entry_priv
->desc
= NULL
;
153 int rt2x00mmio_initialize(struct rt2x00_dev
*rt2x00dev
)
155 struct data_queue
*queue
;
161 queue_for_each(rt2x00dev
, queue
) {
162 status
= rt2x00mmio_alloc_queue_dma(rt2x00dev
, queue
);
168 * Register interrupt handler.
170 status
= request_irq(rt2x00dev
->irq
,
171 rt2x00dev
->ops
->lib
->irq_handler
,
172 IRQF_SHARED
, rt2x00dev
->name
, rt2x00dev
);
174 rt2x00_err(rt2x00dev
, "IRQ %d allocation failed (error %d)\n",
175 rt2x00dev
->irq
, status
);
182 queue_for_each(rt2x00dev
, queue
)
183 rt2x00mmio_free_queue_dma(rt2x00dev
, queue
);
187 EXPORT_SYMBOL_GPL(rt2x00mmio_initialize
);
189 void rt2x00mmio_uninitialize(struct rt2x00_dev
*rt2x00dev
)
191 struct data_queue
*queue
;
196 free_irq(rt2x00dev
->irq
, rt2x00dev
);
201 queue_for_each(rt2x00dev
, queue
)
202 rt2x00mmio_free_queue_dma(rt2x00dev
, queue
);
204 EXPORT_SYMBOL_GPL(rt2x00mmio_uninitialize
);
207 * rt2x00mmio module information.
209 MODULE_AUTHOR(DRV_PROJECT
);
210 MODULE_VERSION(DRV_VERSION
);
211 MODULE_DESCRIPTION("rt2x00 mmio library");
212 MODULE_LICENSE("GPL");