1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * ngene-i2c.c: nGene PCIe bridge driver i2c functions
4 *
5 * Copyright (C) 2005-2007 Micronas
6 *
7 * Copyright (C) 2008-2009 Ralph Metzler <rjkm@metzlerbros.de>
8 * Modifications for new nGene firmware,
9 * support for EEPROM-copying,
10 * support for new dual DVB-S2 card prototype
11 */
12
13 /* FIXME - some of these can probably be removed */
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/delay.h>
17 #include <linux/slab.h>
18 #include <linux/poll.h>
19 #include <linux/io.h>
20 #include <asm/div64.h>
21 #include <linux/pci.h>
22 #include <linux/pci_ids.h>
23 #include <linux/timer.h>
24 #include <linux/byteorder/generic.h>
25 #include <linux/firmware.h>
26 #include <linux/vmalloc.h>
27
28 #include "ngene.h"
29
30 /* Firmware command for i2c operations */
ngene_command_i2c_read(struct ngene * dev,u8 adr,u8 * out,u8 outlen,u8 * in,u8 inlen,int flag)31 static int ngene_command_i2c_read(struct ngene *dev, u8 adr,
32 u8 *out, u8 outlen, u8 *in, u8 inlen, int flag)
33 {
34 struct ngene_command com;
35
36 com.cmd.hdr.Opcode = CMD_I2C_READ;
37 com.cmd.hdr.Length = outlen + 3;
38 com.cmd.I2CRead.Device = adr << 1;
39 memcpy(com.cmd.I2CRead.Data, out, outlen);
40 com.cmd.I2CRead.Data[outlen] = inlen;
41 com.cmd.I2CRead.Data[outlen + 1] = 0;
42 com.in_len = outlen + 3;
43 com.out_len = inlen + 1;
44
45 if (ngene_command(dev, &com) < 0)
46 return -EIO;
47
48 if ((com.cmd.raw8[0] >> 1) != adr)
49 return -EIO;
50
51 if (flag)
52 memcpy(in, com.cmd.raw8, inlen + 1);
53 else
54 memcpy(in, com.cmd.raw8 + 1, inlen);
55 return 0;
56 }
57
ngene_command_i2c_write(struct ngene * dev,u8 adr,u8 * out,u8 outlen)58 static int ngene_command_i2c_write(struct ngene *dev, u8 adr,
59 u8 *out, u8 outlen)
60 {
61 struct ngene_command com;
62
63
64 com.cmd.hdr.Opcode = CMD_I2C_WRITE;
65 com.cmd.hdr.Length = outlen + 1;
66 com.cmd.I2CRead.Device = adr << 1;
67 memcpy(com.cmd.I2CRead.Data, out, outlen);
68 com.in_len = outlen + 1;
69 com.out_len = 1;
70
71 if (ngene_command(dev, &com) < 0)
72 return -EIO;
73
74 if (com.cmd.raw8[0] == 1)
75 return -EIO;
76
77 return 0;
78 }
79
ngene_i2c_set_bus(struct ngene * dev,int bus)80 static void ngene_i2c_set_bus(struct ngene *dev, int bus)
81 {
82 if (!(dev->card_info->i2c_access & 2))
83 return;
84 if (dev->i2c_current_bus == bus)
85 return;
86
87 switch (bus) {
88 case 0:
89 ngene_command_gpio_set(dev, 3, 0);
90 ngene_command_gpio_set(dev, 2, 1);
91 break;
92
93 case 1:
94 ngene_command_gpio_set(dev, 2, 0);
95 ngene_command_gpio_set(dev, 3, 1);
96 break;
97 }
98 dev->i2c_current_bus = bus;
99 }
100
ngene_i2c_master_xfer(struct i2c_adapter * adapter,struct i2c_msg msg[],int num)101 static int ngene_i2c_master_xfer(struct i2c_adapter *adapter,
102 struct i2c_msg msg[], int num)
103 {
104 struct ngene_channel *chan =
105 (struct ngene_channel *)i2c_get_adapdata(adapter);
106 struct ngene *dev = chan->dev;
107
108 mutex_lock(&dev->i2c_switch_mutex);
109 ngene_i2c_set_bus(dev, chan->number);
110
111 if (num == 2 && msg[1].flags & I2C_M_RD && !(msg[0].flags & I2C_M_RD))
112 if (!ngene_command_i2c_read(dev, msg[0].addr,
113 msg[0].buf, msg[0].len,
114 msg[1].buf, msg[1].len, 0))
115 goto done;
116
117 if (num == 1 && !(msg[0].flags & I2C_M_RD))
118 if (!ngene_command_i2c_write(dev, msg[0].addr,
119 msg[0].buf, msg[0].len))
120 goto done;
121 if (num == 1 && (msg[0].flags & I2C_M_RD))
122 if (!ngene_command_i2c_read(dev, msg[0].addr, NULL, 0,
123 msg[0].buf, msg[0].len, 0))
124 goto done;
125
126 mutex_unlock(&dev->i2c_switch_mutex);
127 return -EIO;
128
129 done:
130 mutex_unlock(&dev->i2c_switch_mutex);
131 return num;
132 }
133
134
ngene_i2c_functionality(struct i2c_adapter * adap)135 static u32 ngene_i2c_functionality(struct i2c_adapter *adap)
136 {
137 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
138 }
139
140 static const struct i2c_algorithm ngene_i2c_algo = {
141 .master_xfer = ngene_i2c_master_xfer,
142 .functionality = ngene_i2c_functionality,
143 };
144
ngene_i2c_init(struct ngene * dev,int dev_nr)145 int ngene_i2c_init(struct ngene *dev, int dev_nr)
146 {
147 struct i2c_adapter *adap = &(dev->channel[dev_nr].i2c_adapter);
148
149 i2c_set_adapdata(adap, &(dev->channel[dev_nr]));
150
151 strscpy(adap->name, "nGene", sizeof(adap->name));
152
153 adap->algo = &ngene_i2c_algo;
154 adap->algo_data = (void *)&(dev->channel[dev_nr]);
155 adap->dev.parent = &dev->pci_dev->dev;
156
157 return i2c_add_adapter(adap);
158 }
159
160