ebc4af048d33e536740862311e89e58e3fa86e88
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
16 * Copyright (C) 2010 Ralph Hempel <ralph.hempel@lantiq.com>
17 * Copyright (C) 2009 Mohammad Firdaus
21 \defgroup IFX_DEU IFX_DEU_DRIVERS
23 \brief ifx deu driver module
27 \file ifxmips_deu_dma.c
29 \brief DMA deu driver file
33 \defgroup IFX_DMA_FUNCTIONS IFX_DMA_FUNCTIONS
35 \brief deu-dma driver functions
38 /* Project header files */
39 #include <linux/module.h>
40 #include <linux/init.h>
41 #include <linux/types.h>
42 #include <linux/errno.h>
43 #include <linux/delay.h>
45 #include "ifxmips_deu.h"
47 extern _ifx_deu_device ifx_deu
[1];
48 extern spinlock_t ifx_deu_lock
;
50 //extern deu_drv_priv_t deu_dma_priv;
52 /*! \fn int deu_dma_intr_handler (struct dma_device_info *dma_dev, int status)
53 * \ingroup IFX_DMA_FUNCTIONS
54 * \brief callback function for deu dma interrupt
55 * \param dma_dev dma device
56 * \param status not used
58 int deu_dma_intr_handler (struct dma_device_info
*dma_dev
, int status
)
62 while (len
<= 20000) { len
++; }
67 deu_drv_priv_t
*deu_priv
= (deu_drv_priv_t
*)dma_dev
->priv
;
68 //printk("status:%d \n",status);
71 len
= dma_device_read(dma_dev
, (u8
**)&buf
, NULL
);
72 if ( len
!= deu_priv
->deu_rx_len
) {
73 printk(KERN_ERR
"%s packet length %d is not equal to expect %d\n",
74 __func__
, len
, deu_priv
->deu_rx_len
);
77 memcpy(deu_priv
->deu_rx_buf
, buf
, deu_priv
->deu_rx_len
);
78 /* Reset for next usage */
79 deu_priv
->deu_rx_buf
= NULL
;
80 deu_priv
->deu_rx_len
= 0;
81 DEU_WAKEUP_EVENT(deu_priv
->deu_thread_wait
, DEU_EVENT
, deu_priv
->deu_event_flags
);
84 // delay for buffer to be cleared
85 while (len
<= 20000) { len
++; }
88 case TRANSMIT_CPT_INT
:
97 extern u8
*g_dma_block
;
98 extern u8
*g_dma_block2
;
100 /*! \fn u8 *deu_dma_buffer_alloc (int len, int *byte_offset, void **opt)
101 * \ingroup IFX_DMA_FUNCTIONS
102 * \brief callback function for allocating buffers for dma receive descriptors
103 * \param len not used
104 * \param byte_offset dma byte offset
105 * \param *opt not used
108 u8
*deu_dma_buffer_alloc (int len
, int *byte_offset
, void **opt
)
112 // dma-core needs at least 2 blocks of memory
114 g_dma_block
= g_dma_block2
;
117 //dma_cache_wback_inv((unsigned long) g_dma_block, (PAGE_SIZE >> 1));
123 /*! \fn int deu_dma_buffer_free (u8 * dataptr, void *opt)
124 * \ingroup IFX_DMA_FUNCTIONS
125 * \brief callback function for freeing dma transmit descriptors
126 * \param dataptr data pointer to be freed
127 * \param opt not used
129 int deu_dma_buffer_free (u8
*dataptr
, void *opt
)
132 printk("Trying to free memory buffer\n");
133 if (dataptr
== NULL
&& opt
== NULL
)
135 else if (opt
== NULL
) {
139 else if (dataptr
== NULL
) {