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cx25840-firmware.c
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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/firmware.h>
21 #include <media/v4l2-common.h>
22 #include <media/cx25840.h>
23 
24 #include "cx25840-core.h"
25 
26 /*
27  * Mike Isely <[email protected]> - The FWSEND parameter controls the
28  * size of the firmware chunks sent down the I2C bus to the chip.
29  * Previously this had been set to 1024 but unfortunately some I2C
30  * implementations can't transfer data in such big gulps.
31  * Specifically, the pvrusb2 driver has a hard limit of around 60
32  * bytes, due to the encapsulation there of I2C traffic into USB
33  * messages. So we have to significantly reduce this parameter.
34  */
35 #define FWSEND 48
36 
37 #define FWDEV(x) &((x)->dev)
38 
39 static char *firmware = "";
40 
41 module_param(firmware, charp, 0444);
42 
43 MODULE_PARM_DESC(firmware, "Firmware image to load");
44 
45 static void start_fw_load(struct i2c_client *client)
46 {
47  /* DL_ADDR_LB=0 DL_ADDR_HB=0 */
48  cx25840_write(client, 0x800, 0x00);
49  cx25840_write(client, 0x801, 0x00);
50  // DL_MAP=3 DL_AUTO_INC=0 DL_ENABLE=1
51  cx25840_write(client, 0x803, 0x0b);
52  /* AUTO_INC_DIS=1 */
53  cx25840_write(client, 0x000, 0x20);
54 }
55 
56 static void end_fw_load(struct i2c_client *client)
57 {
58  /* AUTO_INC_DIS=0 */
59  cx25840_write(client, 0x000, 0x00);
60  /* DL_ENABLE=0 */
61  cx25840_write(client, 0x803, 0x03);
62 }
63 
64 #define CX2388x_FIRMWARE "v4l-cx23885-avcore-01.fw"
65 #define CX231xx_FIRMWARE "v4l-cx231xx-avcore-01.fw"
66 #define CX25840_FIRMWARE "v4l-cx25840.fw"
67 
68 static const char *get_fw_name(struct i2c_client *client)
69 {
70  struct cx25840_state *state = to_state(i2c_get_clientdata(client));
71 
72  if (firmware[0])
73  return firmware;
74  if (is_cx2388x(state))
75  return CX2388x_FIRMWARE;
76  if (is_cx231xx(state))
77  return CX231xx_FIRMWARE;
78  return CX25840_FIRMWARE;
79 }
80 
81 static int check_fw_load(struct i2c_client *client, int size)
82 {
83  /* DL_ADDR_HB DL_ADDR_LB */
84  int s = cx25840_read(client, 0x801) << 8;
85  s |= cx25840_read(client, 0x800);
86 
87  if (size != s) {
88  v4l_err(client, "firmware %s load failed\n",
89  get_fw_name(client));
90  return -EINVAL;
91  }
92 
93  v4l_info(client, "loaded %s firmware (%d bytes)\n",
94  get_fw_name(client), size);
95  return 0;
96 }
97 
98 static int fw_write(struct i2c_client *client, const u8 *data, int size)
99 {
100  if (i2c_master_send(client, data, size) < size) {
101  v4l_err(client, "firmware load i2c failure\n");
102  return -ENOSYS;
103  }
104 
105  return 0;
106 }
107 
108 int cx25840_loadfw(struct i2c_client *client)
109 {
110  struct cx25840_state *state = to_state(i2c_get_clientdata(client));
111  const struct firmware *fw = NULL;
112  u8 buffer[FWSEND];
113  const u8 *ptr;
114  const char *fwname = get_fw_name(client);
115  int size, retval;
116  int MAX_BUF_SIZE = FWSEND;
117  u32 gpio_oe = 0, gpio_da = 0;
118 
119  if (is_cx2388x(state)) {
120  /* Preserve the GPIO OE and output bits */
121  gpio_oe = cx25840_read(client, 0x160);
122  gpio_da = cx25840_read(client, 0x164);
123  }
124 
125  if (is_cx231xx(state) && MAX_BUF_SIZE > 16) {
126  v4l_err(client, " Firmware download size changed to 16 bytes max length\n");
127  MAX_BUF_SIZE = 16; /* cx231xx cannot accept more than 16 bytes at a time */
128  }
129 
130  if (request_firmware(&fw, fwname, FWDEV(client)) != 0) {
131  v4l_err(client, "unable to open firmware %s\n", fwname);
132  return -EINVAL;
133  }
134 
135  start_fw_load(client);
136 
137  buffer[0] = 0x08;
138  buffer[1] = 0x02;
139 
140  size = fw->size;
141  ptr = fw->data;
142  while (size > 0) {
143  int len = min(MAX_BUF_SIZE - 2, size);
144 
145  memcpy(buffer + 2, ptr, len);
146 
147  retval = fw_write(client, buffer, len + 2);
148 
149  if (retval < 0) {
150  release_firmware(fw);
151  return retval;
152  }
153 
154  size -= len;
155  ptr += len;
156  }
157 
158  end_fw_load(client);
159 
160  size = fw->size;
161  release_firmware(fw);
162 
163  if (is_cx2388x(state)) {
164  /* Restore GPIO configuration after f/w load */
165  cx25840_write(client, 0x160, gpio_oe);
166  cx25840_write(client, 0x164, gpio_da);
167  }
168 
169  return check_fw_load(client, size);
170 }
171 
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