1 /*
2  * ngene-i2c.c: nGene PCIe bridge driver i2c functions
3  *
4  * Copyright (C) 2005-2007 Micronas
5  *
6  * Copyright (C) 2008-2009 Ralph Metzler <rjkm@metzlerbros.de>
7  *                         Modifications for new nGene firmware,
8  *                         support for EEPROM-copying,
9  *                         support for new dual DVB-S2 card prototype
10  *
11  *
12  * This program is free software; you can redistribute it and/or
13  * modify it under the terms of the GNU General Public License
14  * version 2 only, as published by the Free Software Foundation.
15  *
16  *
17  * This program is distributed in the hope that it will be useful,
18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20  * GNU General Public License for more details.
21  *
22  *
23  * You should have received a copy of the GNU General Public License
24  * along with this program; if not, write to the Free Software
25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
26  * 02110-1301, USA
27  * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
28  */
29 
30 /* FIXME - some of these can probably be removed */
31 #include <linux/module.h>
32 #include <linux/init.h>
33 #include <linux/delay.h>
34 #include <linux/slab.h>
35 #include <linux/poll.h>
36 #include <linux/io.h>
37 #include <asm/div64.h>
38 #include <linux/pci.h>
39 #include <linux/pci_ids.h>
40 #include <linux/timer.h>
41 #include <linux/byteorder/generic.h>
42 #include <linux/firmware.h>
43 #include <linux/vmalloc.h>
44 
45 #include "ngene.h"
46 
47 /* Firmware command for i2c operations */
48 static int ngene_command_i2c_read(struct ngene *dev, u8 adr,
49 			   u8 *out, u8 outlen, u8 *in, u8 inlen, int flag)
50 {
51 	struct ngene_command com;
52 
53 	com.cmd.hdr.Opcode = CMD_I2C_READ;
54 	com.cmd.hdr.Length = outlen + 3;
55 	com.cmd.I2CRead.Device = adr << 1;
56 	memcpy(com.cmd.I2CRead.Data, out, outlen);
57 	com.cmd.I2CRead.Data[outlen] = inlen;
58 	com.cmd.I2CRead.Data[outlen + 1] = 0;
59 	com.in_len = outlen + 3;
60 	com.out_len = inlen + 1;
61 
62 	if (ngene_command(dev, &com) < 0)
63 		return -EIO;
64 
65 	if ((com.cmd.raw8[0] >> 1) != adr)
66 		return -EIO;
67 
68 	if (flag)
69 		memcpy(in, com.cmd.raw8, inlen + 1);
70 	else
71 		memcpy(in, com.cmd.raw8 + 1, inlen);
72 	return 0;
73 }
74 
75 static int ngene_command_i2c_write(struct ngene *dev, u8 adr,
76 				   u8 *out, u8 outlen)
77 {
78 	struct ngene_command com;
79 
80 
81 	com.cmd.hdr.Opcode = CMD_I2C_WRITE;
82 	com.cmd.hdr.Length = outlen + 1;
83 	com.cmd.I2CRead.Device = adr << 1;
84 	memcpy(com.cmd.I2CRead.Data, out, outlen);
85 	com.in_len = outlen + 1;
86 	com.out_len = 1;
87 
88 	if (ngene_command(dev, &com) < 0)
89 		return -EIO;
90 
91 	if (com.cmd.raw8[0] == 1)
92 		return -EIO;
93 
94 	return 0;
95 }
96 
97 static void ngene_i2c_set_bus(struct ngene *dev, int bus)
98 {
99 	if (!(dev->card_info->i2c_access & 2))
100 		return;
101 	if (dev->i2c_current_bus == bus)
102 		return;
103 
104 	switch (bus) {
105 	case 0:
106 		ngene_command_gpio_set(dev, 3, 0);
107 		ngene_command_gpio_set(dev, 2, 1);
108 		break;
109 
110 	case 1:
111 		ngene_command_gpio_set(dev, 2, 0);
112 		ngene_command_gpio_set(dev, 3, 1);
113 		break;
114 	}
115 	dev->i2c_current_bus = bus;
116 }
117 
118 static int ngene_i2c_master_xfer(struct i2c_adapter *adapter,
119 				 struct i2c_msg msg[], int num)
120 {
121 	struct ngene_channel *chan =
122 		(struct ngene_channel *)i2c_get_adapdata(adapter);
123 	struct ngene *dev = chan->dev;
124 
125 	down(&dev->i2c_switch_mutex);
126 	ngene_i2c_set_bus(dev, chan->number);
127 
128 	if (num == 2 && msg[1].flags & I2C_M_RD && !(msg[0].flags & I2C_M_RD))
129 		if (!ngene_command_i2c_read(dev, msg[0].addr,
130 					    msg[0].buf, msg[0].len,
131 					    msg[1].buf, msg[1].len, 0))
132 			goto done;
133 
134 	if (num == 1 && !(msg[0].flags & I2C_M_RD))
135 		if (!ngene_command_i2c_write(dev, msg[0].addr,
136 					     msg[0].buf, msg[0].len))
137 			goto done;
138 	if (num == 1 && (msg[0].flags & I2C_M_RD))
139 		if (!ngene_command_i2c_read(dev, msg[0].addr, NULL, 0,
140 					    msg[0].buf, msg[0].len, 0))
141 			goto done;
142 
143 	up(&dev->i2c_switch_mutex);
144 	return -EIO;
145 
146 done:
147 	up(&dev->i2c_switch_mutex);
148 	return num;
149 }
150 
151 
152 static u32 ngene_i2c_functionality(struct i2c_adapter *adap)
153 {
154 	return I2C_FUNC_SMBUS_EMUL;
155 }
156 
157 static struct i2c_algorithm ngene_i2c_algo = {
158 	.master_xfer = ngene_i2c_master_xfer,
159 	.functionality = ngene_i2c_functionality,
160 };
161 
162 int ngene_i2c_init(struct ngene *dev, int dev_nr)
163 {
164 	struct i2c_adapter *adap = &(dev->channel[dev_nr].i2c_adapter);
165 
166 	i2c_set_adapdata(adap, &(dev->channel[dev_nr]));
167 
168 	strcpy(adap->name, "nGene");
169 
170 	adap->algo = &ngene_i2c_algo;
171 	adap->algo_data = (void *)&(dev->channel[dev_nr]);
172 	adap->dev.parent = &dev->pci_dev->dev;
173 
174 	return i2c_add_adapter(adap);
175 }
176 
177