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 <isely@pobox.com> - 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 	/* cx231xx cannot accept more than 16 bytes at a time */
126 	if (is_cx231xx(state) && max_buf_size > 16)
127 		max_buf_size = 16;
128 
129 	if (request_firmware(&fw, fwname, FWDEV(client)) != 0) {
130 		v4l_err(client, "unable to open firmware %s\n", fwname);
131 		return -EINVAL;
132 	}
133 
134 	start_fw_load(client);
135 
136 	buffer[0] = 0x08;
137 	buffer[1] = 0x02;
138 
139 	size = fw->size;
140 	ptr = fw->data;
141 	while (size > 0) {
142 		int len = min(max_buf_size - 2, size);
143 
144 		memcpy(buffer + 2, ptr, len);
145 
146 		retval = fw_write(client, buffer, len + 2);
147 
148 		if (retval < 0) {
149 			release_firmware(fw);
150 			return retval;
151 		}
152 
153 		size -= len;
154 		ptr += len;
155 	}
156 
157 	end_fw_load(client);
158 
159 	size = fw->size;
160 	release_firmware(fw);
161 
162 	if (is_cx2388x(state)) {
163 		/* Restore GPIO configuration after f/w load */
164 		cx25840_write(client, 0x160, gpio_oe);
165 		cx25840_write(client, 0x164, gpio_da);
166 	}
167 
168 	return check_fw_load(client, size);
169 }
170 
171 MODULE_FIRMWARE(CX2388x_FIRMWARE);
172 MODULE_FIRMWARE(CX231xx_FIRMWARE);
173 MODULE_FIRMWARE(CX25840_FIRMWARE);
174 
175