11802d0beSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
27955f03dSHans Verkuil /*
37955f03dSHans Verkuil * Copyright (C) 2005-2006 Micronas USA Inc.
47955f03dSHans Verkuil */
57955f03dSHans Verkuil
67955f03dSHans Verkuil #include <linux/module.h>
77955f03dSHans Verkuil #include <linux/delay.h>
87955f03dSHans Verkuil #include <linux/sched.h>
97955f03dSHans Verkuil #include <linux/list.h>
107955f03dSHans Verkuil #include <linux/unistd.h>
117955f03dSHans Verkuil #include <linux/time.h>
127955f03dSHans Verkuil #include <linux/device.h>
137955f03dSHans Verkuil #include <linux/i2c.h>
147955f03dSHans Verkuil #include <linux/mutex.h>
157955f03dSHans Verkuil #include <linux/uaccess.h>
167955f03dSHans Verkuil
177955f03dSHans Verkuil #include "go7007-priv.h"
187955f03dSHans Verkuil
197955f03dSHans Verkuil /********************* Driver for on-board I2C adapter *********************/
207955f03dSHans Verkuil
217955f03dSHans Verkuil /* #define GO7007_I2C_DEBUG */
227955f03dSHans Verkuil
237955f03dSHans Verkuil #define SPI_I2C_ADDR_BASE 0x1400
247955f03dSHans Verkuil #define STATUS_REG_ADDR (SPI_I2C_ADDR_BASE + 0x2)
257955f03dSHans Verkuil #define I2C_CTRL_REG_ADDR (SPI_I2C_ADDR_BASE + 0x6)
267955f03dSHans Verkuil #define I2C_DEV_UP_ADDR_REG_ADDR (SPI_I2C_ADDR_BASE + 0x7)
277955f03dSHans Verkuil #define I2C_LO_ADDR_REG_ADDR (SPI_I2C_ADDR_BASE + 0x8)
287955f03dSHans Verkuil #define I2C_DATA_REG_ADDR (SPI_I2C_ADDR_BASE + 0x9)
297955f03dSHans Verkuil #define I2C_CLKFREQ_REG_ADDR (SPI_I2C_ADDR_BASE + 0xa)
307955f03dSHans Verkuil
317955f03dSHans Verkuil #define I2C_STATE_MASK 0x0007
327955f03dSHans Verkuil #define I2C_READ_READY_MASK 0x0008
337955f03dSHans Verkuil
347955f03dSHans Verkuil /* There is only one I2C port on the TW2804 that feeds all four GO7007 VIPs
357955f03dSHans Verkuil * on the Adlink PCI-MPG24, so access is shared between all of them. */
36*68879806SRicardo Ribalda static DEFINE_MUTEX(adlink_mpg24_i2c_mutex);
37*68879806SRicardo Ribalda
adlink_mpg24_i2c_lock(struct go7007 * go)38*68879806SRicardo Ribalda static inline void adlink_mpg24_i2c_lock(struct go7007 *go)
39*68879806SRicardo Ribalda {
40*68879806SRicardo Ribalda /* Bridge the I2C port on this GO7007 to the shared bus */
41*68879806SRicardo Ribalda mutex_lock(&adlink_mpg24_i2c_mutex);
42*68879806SRicardo Ribalda go7007_write_addr(go, 0x3c82, 0x0020);
43*68879806SRicardo Ribalda }
44*68879806SRicardo Ribalda
adlink_mpg24_i2c_unlock(struct go7007 * go)45*68879806SRicardo Ribalda static inline void adlink_mpg24_i2c_unlock(struct go7007 *go)
46*68879806SRicardo Ribalda {
47*68879806SRicardo Ribalda /* Isolate the I2C port on this GO7007 from the shared bus */
48*68879806SRicardo Ribalda go7007_write_addr(go, 0x3c82, 0x0000);
49*68879806SRicardo Ribalda mutex_unlock(&adlink_mpg24_i2c_mutex);
50*68879806SRicardo Ribalda }
517955f03dSHans Verkuil
go7007_i2c_xfer(struct go7007 * go,u16 addr,int read,u16 command,int flags,u8 * data)527955f03dSHans Verkuil static int go7007_i2c_xfer(struct go7007 *go, u16 addr, int read,
537955f03dSHans Verkuil u16 command, int flags, u8 *data)
547955f03dSHans Verkuil {
557955f03dSHans Verkuil int i, ret = -EIO;
567955f03dSHans Verkuil u16 val;
577955f03dSHans Verkuil
587955f03dSHans Verkuil if (go->status == STATUS_SHUTDOWN)
597955f03dSHans Verkuil return -ENODEV;
607955f03dSHans Verkuil
617955f03dSHans Verkuil #ifdef GO7007_I2C_DEBUG
627955f03dSHans Verkuil if (read)
637955f03dSHans Verkuil dev_dbg(go->dev, "go7007-i2c: reading 0x%02x on 0x%02x\n",
647955f03dSHans Verkuil command, addr);
657955f03dSHans Verkuil else
667955f03dSHans Verkuil dev_dbg(go->dev,
677955f03dSHans Verkuil "go7007-i2c: writing 0x%02x to 0x%02x on 0x%02x\n",
687955f03dSHans Verkuil *data, command, addr);
697955f03dSHans Verkuil #endif
707955f03dSHans Verkuil
717955f03dSHans Verkuil mutex_lock(&go->hw_lock);
727955f03dSHans Verkuil
73*68879806SRicardo Ribalda if (go->board_id == GO7007_BOARDID_ADLINK_MPG24)
74*68879806SRicardo Ribalda adlink_mpg24_i2c_lock(go);
757955f03dSHans Verkuil
767955f03dSHans Verkuil /* Wait for I2C adapter to be ready */
777955f03dSHans Verkuil for (i = 0; i < 10; ++i) {
787955f03dSHans Verkuil if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0)
797955f03dSHans Verkuil goto i2c_done;
807955f03dSHans Verkuil if (!(val & I2C_STATE_MASK))
817955f03dSHans Verkuil break;
827955f03dSHans Verkuil msleep(100);
837955f03dSHans Verkuil }
847955f03dSHans Verkuil if (i == 10) {
857955f03dSHans Verkuil dev_err(go->dev, "go7007-i2c: I2C adapter is hung\n");
867955f03dSHans Verkuil goto i2c_done;
877955f03dSHans Verkuil }
887955f03dSHans Verkuil
897955f03dSHans Verkuil /* Set target register (command) */
907955f03dSHans Verkuil go7007_write_addr(go, I2C_CTRL_REG_ADDR, flags);
917955f03dSHans Verkuil go7007_write_addr(go, I2C_LO_ADDR_REG_ADDR, command);
927955f03dSHans Verkuil
937955f03dSHans Verkuil /* If we're writing, send the data and target address and we're done */
947955f03dSHans Verkuil if (!read) {
957955f03dSHans Verkuil go7007_write_addr(go, I2C_DATA_REG_ADDR, *data);
967955f03dSHans Verkuil go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR,
977955f03dSHans Verkuil (addr << 9) | (command >> 8));
987955f03dSHans Verkuil ret = 0;
997955f03dSHans Verkuil goto i2c_done;
1007955f03dSHans Verkuil }
1017955f03dSHans Verkuil
1027955f03dSHans Verkuil /* Otherwise, we're reading. First clear i2c_rx_data_rdy. */
1037955f03dSHans Verkuil if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0)
1047955f03dSHans Verkuil goto i2c_done;
1057955f03dSHans Verkuil
1067955f03dSHans Verkuil /* Send the target address plus read flag */
1077955f03dSHans Verkuil go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR,
1087955f03dSHans Verkuil (addr << 9) | 0x0100 | (command >> 8));
1097955f03dSHans Verkuil
1107955f03dSHans Verkuil /* Wait for i2c_rx_data_rdy */
1117955f03dSHans Verkuil for (i = 0; i < 10; ++i) {
1127955f03dSHans Verkuil if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0)
1137955f03dSHans Verkuil goto i2c_done;
1147955f03dSHans Verkuil if (val & I2C_READ_READY_MASK)
1157955f03dSHans Verkuil break;
1167955f03dSHans Verkuil msleep(100);
1177955f03dSHans Verkuil }
1187955f03dSHans Verkuil if (i == 10) {
1197955f03dSHans Verkuil dev_err(go->dev, "go7007-i2c: I2C adapter is hung\n");
1207955f03dSHans Verkuil goto i2c_done;
1217955f03dSHans Verkuil }
1227955f03dSHans Verkuil
1237955f03dSHans Verkuil /* Retrieve the read byte */
1247955f03dSHans Verkuil if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0)
1257955f03dSHans Verkuil goto i2c_done;
1267955f03dSHans Verkuil *data = val;
1277955f03dSHans Verkuil ret = 0;
1287955f03dSHans Verkuil
1297955f03dSHans Verkuil i2c_done:
130*68879806SRicardo Ribalda if (go->board_id == GO7007_BOARDID_ADLINK_MPG24)
131*68879806SRicardo Ribalda adlink_mpg24_i2c_unlock(go);
1327955f03dSHans Verkuil mutex_unlock(&go->hw_lock);
1337955f03dSHans Verkuil return ret;
1347955f03dSHans Verkuil }
1357955f03dSHans Verkuil
go7007_smbus_xfer(struct i2c_adapter * adapter,u16 addr,unsigned short flags,char read_write,u8 command,int size,union i2c_smbus_data * data)1367955f03dSHans Verkuil static int go7007_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
1377955f03dSHans Verkuil unsigned short flags, char read_write,
1387955f03dSHans Verkuil u8 command, int size, union i2c_smbus_data *data)
1397955f03dSHans Verkuil {
1407955f03dSHans Verkuil struct go7007 *go = i2c_get_adapdata(adapter);
1417955f03dSHans Verkuil
1427955f03dSHans Verkuil if (size != I2C_SMBUS_BYTE_DATA)
1437955f03dSHans Verkuil return -EIO;
1447955f03dSHans Verkuil return go7007_i2c_xfer(go, addr, read_write == I2C_SMBUS_READ, command,
1457955f03dSHans Verkuil flags & I2C_CLIENT_SCCB ? 0x10 : 0x00, &data->byte);
1467955f03dSHans Verkuil }
1477955f03dSHans Verkuil
1487955f03dSHans Verkuil /* VERY LIMITED I2C master xfer function -- only needed because the
1497955f03dSHans Verkuil * SMBus functions only support 8-bit commands and the SAA7135 uses
1507955f03dSHans Verkuil * 16-bit commands. The I2C interface on the GO7007, as limited as
1517955f03dSHans Verkuil * it is, does support this mode. */
1527955f03dSHans Verkuil
go7007_i2c_master_xfer(struct i2c_adapter * adapter,struct i2c_msg msgs[],int num)1537955f03dSHans Verkuil static int go7007_i2c_master_xfer(struct i2c_adapter *adapter,
1547955f03dSHans Verkuil struct i2c_msg msgs[], int num)
1557955f03dSHans Verkuil {
1567955f03dSHans Verkuil struct go7007 *go = i2c_get_adapdata(adapter);
1577955f03dSHans Verkuil int i;
1587955f03dSHans Verkuil
1597955f03dSHans Verkuil for (i = 0; i < num; ++i) {
1607955f03dSHans Verkuil /* We can only do two things here -- write three bytes, or
1617955f03dSHans Verkuil * write two bytes and read one byte. */
1627955f03dSHans Verkuil if (msgs[i].len == 2) {
1637955f03dSHans Verkuil if (i + 1 == num || msgs[i].addr != msgs[i + 1].addr ||
1647955f03dSHans Verkuil (msgs[i].flags & I2C_M_RD) ||
1657955f03dSHans Verkuil !(msgs[i + 1].flags & I2C_M_RD) ||
1667955f03dSHans Verkuil msgs[i + 1].len != 1)
1677955f03dSHans Verkuil return -EIO;
1687955f03dSHans Verkuil if (go7007_i2c_xfer(go, msgs[i].addr, 1,
1697955f03dSHans Verkuil (msgs[i].buf[0] << 8) | msgs[i].buf[1],
1707955f03dSHans Verkuil 0x01, &msgs[i + 1].buf[0]) < 0)
1717955f03dSHans Verkuil return -EIO;
1727955f03dSHans Verkuil ++i;
1737955f03dSHans Verkuil } else if (msgs[i].len == 3) {
1747955f03dSHans Verkuil if (msgs[i].flags & I2C_M_RD)
1757955f03dSHans Verkuil return -EIO;
1767955f03dSHans Verkuil if (go7007_i2c_xfer(go, msgs[i].addr, 0,
1777955f03dSHans Verkuil (msgs[i].buf[0] << 8) | msgs[i].buf[1],
1787955f03dSHans Verkuil 0x01, &msgs[i].buf[2]) < 0)
1797955f03dSHans Verkuil return -EIO;
1807955f03dSHans Verkuil } else
1817955f03dSHans Verkuil return -EIO;
1827955f03dSHans Verkuil }
1837955f03dSHans Verkuil
1847955f03dSHans Verkuil return num;
1857955f03dSHans Verkuil }
1867955f03dSHans Verkuil
go7007_functionality(struct i2c_adapter * adapter)1877955f03dSHans Verkuil static u32 go7007_functionality(struct i2c_adapter *adapter)
1887955f03dSHans Verkuil {
1897955f03dSHans Verkuil return I2C_FUNC_SMBUS_BYTE_DATA;
1907955f03dSHans Verkuil }
1917955f03dSHans Verkuil
19278f2c50bSJulia Lawall static const struct i2c_algorithm go7007_algo = {
1937955f03dSHans Verkuil .smbus_xfer = go7007_smbus_xfer,
1947955f03dSHans Verkuil .master_xfer = go7007_i2c_master_xfer,
1957955f03dSHans Verkuil .functionality = go7007_functionality,
1967955f03dSHans Verkuil };
1977955f03dSHans Verkuil
1987955f03dSHans Verkuil static struct i2c_adapter go7007_adap_templ = {
1997955f03dSHans Verkuil .owner = THIS_MODULE,
2007955f03dSHans Verkuil .name = "WIS GO7007SB",
2017955f03dSHans Verkuil .algo = &go7007_algo,
2027955f03dSHans Verkuil };
2037955f03dSHans Verkuil
go7007_i2c_init(struct go7007 * go)2047955f03dSHans Verkuil int go7007_i2c_init(struct go7007 *go)
2057955f03dSHans Verkuil {
2067955f03dSHans Verkuil memcpy(&go->i2c_adapter, &go7007_adap_templ,
2077955f03dSHans Verkuil sizeof(go7007_adap_templ));
2087955f03dSHans Verkuil go->i2c_adapter.dev.parent = go->dev;
2097955f03dSHans Verkuil i2c_set_adapdata(&go->i2c_adapter, go);
2107955f03dSHans Verkuil if (i2c_add_adapter(&go->i2c_adapter) < 0) {
2117955f03dSHans Verkuil dev_err(go->dev,
2127955f03dSHans Verkuil "go7007-i2c: error: i2c_add_adapter failed\n");
2137955f03dSHans Verkuil return -1;
2147955f03dSHans Verkuil }
2157955f03dSHans Verkuil return 0;
2167955f03dSHans Verkuil }
217