Merge master.kernel.org:/home/rmk/linux-2.6-arm
[linux-2.6] / drivers / media / video / cx25840 / cx25840-firmware.c
1 /* cx25840 firmware functions
2  *
3  * This program is free software; you can redistribute it and/or
4  * modify it under the terms of the GNU General Public License
5  * as published by the Free Software Foundation; either version 2
6  * of the License, or (at your option) any later version.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11  * GNU General Public License for more details.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program; if not, write to the Free Software
15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
16  */
17
18 #include <linux/module.h>
19 #include <linux/i2c.h>
20 #include <linux/i2c-algo-bit.h>
21 #include <linux/firmware.h>
22 #include <media/v4l2-common.h>
23
24 #include "cx25840.h"
25
26 #define FWFILE "v4l-cx25840.fw"
27 #define FWSEND 1024
28
29 #define FWDEV(x) &((x)->adapter->dev)
30
31 static int fastfw = 1;
32 static char *firmware = FWFILE;
33
34 module_param(fastfw, bool, 0444);
35 module_param(firmware, charp, 0444);
36
37 MODULE_PARM_DESC(fastfw, "Load firmware fast [0=100MHz 1=333MHz (default)]");
38 MODULE_PARM_DESC(firmware, "Firmware image [default: " FWFILE "]");
39
40 static void set_i2c_delay(struct i2c_client *client, int delay)
41 {
42         struct i2c_algo_bit_data *algod = client->adapter->algo_data;
43
44         /* We aren't guaranteed to be using algo_bit,
45          * so avoid the null pointer dereference
46          * and disable the 'fast firmware load' */
47         if (algod) {
48                 algod->udelay = delay;
49         } else {
50                 fastfw = 0;
51         }
52 }
53
54 static void start_fw_load(struct i2c_client *client)
55 {
56         /* DL_ADDR_LB=0 DL_ADDR_HB=0 */
57         cx25840_write(client, 0x800, 0x00);
58         cx25840_write(client, 0x801, 0x00);
59         // DL_MAP=3 DL_AUTO_INC=0 DL_ENABLE=1
60         cx25840_write(client, 0x803, 0x0b);
61         /* AUTO_INC_DIS=1 */
62         cx25840_write(client, 0x000, 0x20);
63
64         if (fastfw)
65                 set_i2c_delay(client, 3);
66 }
67
68 static void end_fw_load(struct i2c_client *client)
69 {
70         if (fastfw)
71                 set_i2c_delay(client, 10);
72
73         /* AUTO_INC_DIS=0 */
74         cx25840_write(client, 0x000, 0x00);
75         /* DL_ENABLE=0 */
76         cx25840_write(client, 0x803, 0x03);
77 }
78
79 static int check_fw_load(struct i2c_client *client, int size)
80 {
81         /* DL_ADDR_HB DL_ADDR_LB */
82         int s = cx25840_read(client, 0x801) << 8;
83         s |= cx25840_read(client, 0x800);
84
85         if (size != s) {
86                 v4l_err(client, "firmware %s load failed\n", firmware);
87                 return -EINVAL;
88         }
89
90         v4l_info(client, "loaded %s firmware (%d bytes)\n", firmware, size);
91         return 0;
92 }
93
94 static int fw_write(struct i2c_client *client, u8 * data, int size)
95 {
96         int sent;
97
98         if ((sent = i2c_master_send(client, data, size)) < size) {
99
100                 if (fastfw) {
101                         v4l_err(client, "333MHz i2c firmware load failed\n");
102                         fastfw = 0;
103                         set_i2c_delay(client, 10);
104
105                         if (sent > 2) {
106                                 u16 dl_addr = cx25840_read(client, 0x801) << 8;
107                                 dl_addr |= cx25840_read(client, 0x800);
108                                 dl_addr -= sent - 2;
109                                 cx25840_write(client, 0x801, dl_addr >> 8);
110                                 cx25840_write(client, 0x800, dl_addr & 0xff);
111                         }
112
113                         if (i2c_master_send(client, data, size) < size) {
114                                 v4l_err(client, "100MHz i2c firmware load failed\n");
115                                 return -ENOSYS;
116                         }
117
118                 } else {
119                         v4l_err(client, "firmware load i2c failure\n");
120                         return -ENOSYS;
121                 }
122
123         }
124
125         return 0;
126 }
127
128 int cx25840_loadfw(struct i2c_client *client)
129 {
130         const struct firmware *fw = NULL;
131         u8 buffer[4], *ptr;
132         int size, send, retval;
133
134         if (request_firmware(&fw, firmware, FWDEV(client)) != 0) {
135                 v4l_err(client, "unable to open firmware %s\n", firmware);
136                 return -EINVAL;
137         }
138
139         start_fw_load(client);
140
141         buffer[0] = 0x08;
142         buffer[1] = 0x02;
143         buffer[2] = fw->data[0];
144         buffer[3] = fw->data[1];
145         retval = fw_write(client, buffer, 4);
146
147         if (retval < 0) {
148                 release_firmware(fw);
149                 return retval;
150         }
151
152         size = fw->size - 2;
153         ptr = fw->data;
154         while (size > 0) {
155                 ptr[0] = 0x08;
156                 ptr[1] = 0x02;
157                 send = size > (FWSEND - 2) ? FWSEND : size + 2;
158                 retval = fw_write(client, ptr, send);
159
160                 if (retval < 0) {
161                         release_firmware(fw);
162                         return retval;
163                 }
164
165                 size -= FWSEND - 2;
166                 ptr += FWSEND - 2;
167         }
168
169         end_fw_load(client);
170
171         size = fw->size;
172         release_firmware(fw);
173
174         return check_fw_load(client, size);
175 }