1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Driver for the NXP SAA7164 PCIe bridge
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (c) 2010-2015 Steven Toth <stoth@kernellabs.com>
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/module.h>
9*4882a593Smuzhiyun #include <linux/moduleparam.h>
10*4882a593Smuzhiyun #include <linux/init.h>
11*4882a593Smuzhiyun #include <linux/delay.h>
12*4882a593Smuzhiyun #include <linux/io.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include "saa7164.h"
15*4882a593Smuzhiyun
i2c_xfer(struct i2c_adapter * i2c_adap,struct i2c_msg * msgs,int num)16*4882a593Smuzhiyun static int i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
17*4882a593Smuzhiyun {
18*4882a593Smuzhiyun struct saa7164_i2c *bus = i2c_adap->algo_data;
19*4882a593Smuzhiyun struct saa7164_dev *dev = bus->dev;
20*4882a593Smuzhiyun int i, retval = 0;
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun dprintk(DBGLVL_I2C, "%s(num = %d)\n", __func__, num);
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun for (i = 0 ; i < num; i++) {
25*4882a593Smuzhiyun dprintk(DBGLVL_I2C, "%s(num = %d) addr = 0x%02x len = 0x%x\n",
26*4882a593Smuzhiyun __func__, num, msgs[i].addr, msgs[i].len);
27*4882a593Smuzhiyun if (msgs[i].flags & I2C_M_RD) {
28*4882a593Smuzhiyun retval = saa7164_api_i2c_read(bus,
29*4882a593Smuzhiyun msgs[i].addr,
30*4882a593Smuzhiyun 0 /* reglen */,
31*4882a593Smuzhiyun NULL /* reg */, msgs[i].len, msgs[i].buf);
32*4882a593Smuzhiyun } else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
33*4882a593Smuzhiyun msgs[i].addr == msgs[i + 1].addr) {
34*4882a593Smuzhiyun /* write then read from same address */
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun retval = saa7164_api_i2c_read(bus, msgs[i].addr,
37*4882a593Smuzhiyun msgs[i].len, msgs[i].buf,
38*4882a593Smuzhiyun msgs[i+1].len, msgs[i+1].buf
39*4882a593Smuzhiyun );
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun i++;
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun if (retval < 0)
44*4882a593Smuzhiyun goto err;
45*4882a593Smuzhiyun } else {
46*4882a593Smuzhiyun /* write */
47*4882a593Smuzhiyun retval = saa7164_api_i2c_write(bus, msgs[i].addr,
48*4882a593Smuzhiyun msgs[i].len, msgs[i].buf);
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun if (retval < 0)
51*4882a593Smuzhiyun goto err;
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun return num;
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun err:
56*4882a593Smuzhiyun return retval;
57*4882a593Smuzhiyun }
58*4882a593Smuzhiyun
saa7164_functionality(struct i2c_adapter * adap)59*4882a593Smuzhiyun static u32 saa7164_functionality(struct i2c_adapter *adap)
60*4882a593Smuzhiyun {
61*4882a593Smuzhiyun return I2C_FUNC_I2C;
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun static const struct i2c_algorithm saa7164_i2c_algo_template = {
65*4882a593Smuzhiyun .master_xfer = i2c_xfer,
66*4882a593Smuzhiyun .functionality = saa7164_functionality,
67*4882a593Smuzhiyun };
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun /* ----------------------------------------------------------------------- */
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun static const struct i2c_adapter saa7164_i2c_adap_template = {
72*4882a593Smuzhiyun .name = "saa7164",
73*4882a593Smuzhiyun .owner = THIS_MODULE,
74*4882a593Smuzhiyun .algo = &saa7164_i2c_algo_template,
75*4882a593Smuzhiyun };
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun static const struct i2c_client saa7164_i2c_client_template = {
78*4882a593Smuzhiyun .name = "saa7164 internal",
79*4882a593Smuzhiyun };
80*4882a593Smuzhiyun
saa7164_i2c_register(struct saa7164_i2c * bus)81*4882a593Smuzhiyun int saa7164_i2c_register(struct saa7164_i2c *bus)
82*4882a593Smuzhiyun {
83*4882a593Smuzhiyun struct saa7164_dev *dev = bus->dev;
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun dprintk(DBGLVL_I2C, "%s(bus = %d)\n", __func__, bus->nr);
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun bus->i2c_adap = saa7164_i2c_adap_template;
88*4882a593Smuzhiyun bus->i2c_client = saa7164_i2c_client_template;
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun bus->i2c_adap.dev.parent = &dev->pci->dev;
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun strscpy(bus->i2c_adap.name, bus->dev->name,
93*4882a593Smuzhiyun sizeof(bus->i2c_adap.name));
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun bus->i2c_adap.algo_data = bus;
96*4882a593Smuzhiyun i2c_set_adapdata(&bus->i2c_adap, bus);
97*4882a593Smuzhiyun i2c_add_adapter(&bus->i2c_adap);
98*4882a593Smuzhiyun
99*4882a593Smuzhiyun bus->i2c_client.adapter = &bus->i2c_adap;
100*4882a593Smuzhiyun
101*4882a593Smuzhiyun if (0 != bus->i2c_rc)
102*4882a593Smuzhiyun printk(KERN_ERR "%s: i2c bus %d register FAILED\n",
103*4882a593Smuzhiyun dev->name, bus->nr);
104*4882a593Smuzhiyun
105*4882a593Smuzhiyun return bus->i2c_rc;
106*4882a593Smuzhiyun }
107*4882a593Smuzhiyun
saa7164_i2c_unregister(struct saa7164_i2c * bus)108*4882a593Smuzhiyun int saa7164_i2c_unregister(struct saa7164_i2c *bus)
109*4882a593Smuzhiyun {
110*4882a593Smuzhiyun i2c_del_adapter(&bus->i2c_adap);
111*4882a593Smuzhiyun return 0;
112*4882a593Smuzhiyun }
113