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468 lines
12 KiB
C
468 lines
12 KiB
C
/*
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i2c Support for Apple SMU Controller
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Copyright (c) 2005 Benjamin Herrenschmidt, IBM Corp.
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<benh@kernel.crashing.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/i2c.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/of_irq.h>
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#include <asm/prom.h>
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#include <asm/pmac_low_i2c.h>
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MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
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MODULE_DESCRIPTION("I2C driver for Apple PowerMac");
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MODULE_LICENSE("GPL");
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/*
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* SMBUS-type transfer entrypoint
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*/
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static s32 i2c_powermac_smbus_xfer( struct i2c_adapter* adap,
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u16 addr,
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unsigned short flags,
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char read_write,
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u8 command,
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int size,
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union i2c_smbus_data* data)
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{
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struct pmac_i2c_bus *bus = i2c_get_adapdata(adap);
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int rc = 0;
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int read = (read_write == I2C_SMBUS_READ);
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int addrdir = (addr << 1) | read;
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int mode, subsize, len;
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u32 subaddr;
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u8 *buf;
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u8 local[2];
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if (size == I2C_SMBUS_QUICK || size == I2C_SMBUS_BYTE) {
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mode = pmac_i2c_mode_std;
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subsize = 0;
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subaddr = 0;
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} else {
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mode = read ? pmac_i2c_mode_combined : pmac_i2c_mode_stdsub;
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subsize = 1;
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subaddr = command;
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}
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switch (size) {
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case I2C_SMBUS_QUICK:
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buf = NULL;
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len = 0;
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break;
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case I2C_SMBUS_BYTE:
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case I2C_SMBUS_BYTE_DATA:
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buf = &data->byte;
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len = 1;
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break;
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case I2C_SMBUS_WORD_DATA:
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if (!read) {
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local[0] = data->word & 0xff;
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local[1] = (data->word >> 8) & 0xff;
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}
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buf = local;
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len = 2;
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break;
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/* Note that these are broken vs. the expected smbus API where
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* on reads, the length is actually returned from the function,
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* but I think the current API makes no sense and I don't want
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* any driver that I haven't verified for correctness to go
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* anywhere near a pmac i2c bus anyway ...
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*
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* I'm also not completely sure what kind of phases to do between
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* the actual command and the data (what I am _supposed_ to do that
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* is). For now, I assume writes are a single stream and reads have
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* a repeat start/addr phase (but not stop in between)
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*/
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case I2C_SMBUS_BLOCK_DATA:
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buf = data->block;
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len = data->block[0] + 1;
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break;
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case I2C_SMBUS_I2C_BLOCK_DATA:
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buf = &data->block[1];
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len = data->block[0];
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break;
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default:
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return -EINVAL;
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}
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rc = pmac_i2c_open(bus, 0);
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if (rc) {
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dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);
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return rc;
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}
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rc = pmac_i2c_setmode(bus, mode);
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if (rc) {
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dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",
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mode, rc);
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goto bail;
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}
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rc = pmac_i2c_xfer(bus, addrdir, subsize, subaddr, buf, len);
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if (rc) {
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if (rc == -ENXIO)
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dev_dbg(&adap->dev,
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"I2C transfer at 0x%02x failed, size %d, "
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"err %d\n", addrdir >> 1, size, rc);
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else
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dev_err(&adap->dev,
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"I2C transfer at 0x%02x failed, size %d, "
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"err %d\n", addrdir >> 1, size, rc);
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goto bail;
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}
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if (size == I2C_SMBUS_WORD_DATA && read) {
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data->word = ((u16)local[1]) << 8;
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data->word |= local[0];
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}
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bail:
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pmac_i2c_close(bus);
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return rc;
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}
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/*
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* Generic i2c master transfer entrypoint. This driver only support single
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* messages (for "lame i2c" transfers). Anything else should use the smbus
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* entry point
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*/
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static int i2c_powermac_master_xfer( struct i2c_adapter *adap,
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struct i2c_msg *msgs,
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int num)
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{
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struct pmac_i2c_bus *bus = i2c_get_adapdata(adap);
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int rc = 0;
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int read;
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int addrdir;
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if (msgs->flags & I2C_M_TEN)
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return -EINVAL;
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read = (msgs->flags & I2C_M_RD) != 0;
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addrdir = (msgs->addr << 1) | read;
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rc = pmac_i2c_open(bus, 0);
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if (rc) {
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dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);
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return rc;
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}
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rc = pmac_i2c_setmode(bus, pmac_i2c_mode_std);
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if (rc) {
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dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",
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pmac_i2c_mode_std, rc);
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goto bail;
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}
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rc = pmac_i2c_xfer(bus, addrdir, 0, 0, msgs->buf, msgs->len);
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if (rc < 0) {
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if (rc == -ENXIO)
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dev_dbg(&adap->dev, "I2C %s 0x%02x failed, err %d\n",
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addrdir & 1 ? "read from" : "write to",
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addrdir >> 1, rc);
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else
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dev_err(&adap->dev, "I2C %s 0x%02x failed, err %d\n",
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addrdir & 1 ? "read from" : "write to",
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addrdir >> 1, rc);
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}
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bail:
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pmac_i2c_close(bus);
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return rc < 0 ? rc : 1;
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}
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static u32 i2c_powermac_func(struct i2c_adapter * adapter)
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{
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return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
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I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
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I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_I2C;
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}
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/* For now, we only handle smbus */
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static const struct i2c_algorithm i2c_powermac_algorithm = {
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.smbus_xfer = i2c_powermac_smbus_xfer,
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.master_xfer = i2c_powermac_master_xfer,
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.functionality = i2c_powermac_func,
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};
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static struct i2c_adapter_quirks i2c_powermac_quirks = {
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.max_num_msgs = 1,
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};
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static int i2c_powermac_remove(struct platform_device *dev)
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{
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struct i2c_adapter *adapter = platform_get_drvdata(dev);
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i2c_del_adapter(adapter);
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memset(adapter, 0, sizeof(*adapter));
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return 0;
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}
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static u32 i2c_powermac_get_addr(struct i2c_adapter *adap,
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struct pmac_i2c_bus *bus,
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struct device_node *node)
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{
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const __be32 *prop;
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int len;
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/* First check for valid "reg" */
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prop = of_get_property(node, "reg", &len);
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if (prop && (len >= sizeof(int)))
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return (be32_to_cpup(prop) & 0xff) >> 1;
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/* Then check old-style "i2c-address" */
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prop = of_get_property(node, "i2c-address", &len);
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if (prop && (len >= sizeof(int)))
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return (be32_to_cpup(prop) & 0xff) >> 1;
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/* Now handle some devices with missing "reg" properties */
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if (!strcmp(node->name, "cereal"))
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return 0x60;
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else if (!strcmp(node->name, "deq"))
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return 0x34;
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dev_warn(&adap->dev, "No i2c address for %s\n", node->full_name);
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return 0xffffffff;
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}
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static void i2c_powermac_create_one(struct i2c_adapter *adap,
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const char *type,
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u32 addr)
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{
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struct i2c_board_info info = {};
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struct i2c_client *newdev;
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strncpy(info.type, type, sizeof(info.type));
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info.addr = addr;
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newdev = i2c_new_device(adap, &info);
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if (!newdev)
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dev_err(&adap->dev,
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"i2c-powermac: Failure to register missing %s\n",
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type);
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}
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static void i2c_powermac_add_missing(struct i2c_adapter *adap,
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struct pmac_i2c_bus *bus,
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bool found_onyx)
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{
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struct device_node *busnode = pmac_i2c_get_bus_node(bus);
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int rc;
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/* Check for the onyx audio codec */
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#define ONYX_REG_CONTROL 67
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if (of_device_is_compatible(busnode, "k2-i2c") && !found_onyx) {
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union i2c_smbus_data data;
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rc = i2c_smbus_xfer(adap, 0x46, 0, I2C_SMBUS_READ,
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ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
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&data);
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if (rc >= 0)
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i2c_powermac_create_one(adap, "MAC,pcm3052", 0x46);
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rc = i2c_smbus_xfer(adap, 0x47, 0, I2C_SMBUS_READ,
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ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
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&data);
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if (rc >= 0)
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i2c_powermac_create_one(adap, "MAC,pcm3052", 0x47);
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}
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}
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static bool i2c_powermac_get_type(struct i2c_adapter *adap,
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struct device_node *node,
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u32 addr, char *type, int type_size)
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{
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char tmp[16];
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/* Note: we to _NOT_ want the standard
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* i2c drivers to match with any of our powermac stuff
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* unless they have been specifically modified to handle
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* it on a case by case basis. For example, for thermal
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* control, things like lm75 etc... shall match with their
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* corresponding windfarm drivers, _NOT_ the generic ones,
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* so we force a prefix of AAPL, onto the modalias to
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* make that happen
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*/
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/* First try proper modalias */
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if (of_modalias_node(node, tmp, sizeof(tmp)) >= 0) {
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snprintf(type, type_size, "MAC,%s", tmp);
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return true;
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}
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/* Now look for known workarounds */
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if (!strcmp(node->name, "deq")) {
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/* Apple uses address 0x34 for TAS3001 and 0x35 for TAS3004 */
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if (addr == 0x34) {
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snprintf(type, type_size, "MAC,tas3001");
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return true;
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} else if (addr == 0x35) {
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snprintf(type, type_size, "MAC,tas3004");
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return true;
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}
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}
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dev_err(&adap->dev, "i2c-powermac: modalias failure"
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" on %s\n", node->full_name);
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return false;
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}
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static void i2c_powermac_register_devices(struct i2c_adapter *adap,
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struct pmac_i2c_bus *bus)
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{
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struct i2c_client *newdev;
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struct device_node *node;
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bool found_onyx = 0;
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/*
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* In some cases we end up with the via-pmu node itself, in this
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* case we skip this function completely as the device-tree will
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* not contain anything useful.
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*/
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if (!strcmp(adap->dev.of_node->name, "via-pmu"))
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return;
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for_each_child_of_node(adap->dev.of_node, node) {
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struct i2c_board_info info = {};
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u32 addr;
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/* Get address & channel */
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addr = i2c_powermac_get_addr(adap, bus, node);
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if (addr == 0xffffffff)
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continue;
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/* Multibus setup, check channel */
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if (!pmac_i2c_match_adapter(node, adap))
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continue;
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dev_dbg(&adap->dev, "i2c-powermac: register %s\n",
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node->full_name);
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/*
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* Keep track of some device existence to handle
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* workarounds later.
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*/
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if (of_device_is_compatible(node, "pcm3052"))
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found_onyx = true;
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/* Make up a modalias */
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if (!i2c_powermac_get_type(adap, node, addr,
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info.type, sizeof(info.type))) {
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continue;
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}
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/* Fill out the rest of the info structure */
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info.addr = addr;
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info.irq = irq_of_parse_and_map(node, 0);
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info.of_node = of_node_get(node);
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newdev = i2c_new_device(adap, &info);
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if (!newdev) {
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dev_err(&adap->dev, "i2c-powermac: Failure to register"
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" %s\n", node->full_name);
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of_node_put(node);
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/* We do not dispose of the interrupt mapping on
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* purpose. It's not necessary (interrupt cannot be
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* re-used) and somebody else might have grabbed it
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* via direct DT lookup so let's not bother
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*/
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continue;
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}
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}
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/* Additional workarounds */
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i2c_powermac_add_missing(adap, bus, found_onyx);
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}
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static int i2c_powermac_probe(struct platform_device *dev)
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{
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struct pmac_i2c_bus *bus = dev_get_platdata(&dev->dev);
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struct device_node *parent = NULL;
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struct i2c_adapter *adapter;
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const char *basename;
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int rc;
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if (bus == NULL)
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return -EINVAL;
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adapter = pmac_i2c_get_adapter(bus);
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/* Ok, now we need to make up a name for the interface that will
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* match what we used to do in the past, that is basically the
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* controller's parent device node for keywest. PMU didn't have a
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* naming convention and SMU has a different one
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*/
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switch(pmac_i2c_get_type(bus)) {
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case pmac_i2c_bus_keywest:
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parent = of_get_parent(pmac_i2c_get_controller(bus));
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if (parent == NULL)
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return -EINVAL;
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basename = parent->name;
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break;
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case pmac_i2c_bus_pmu:
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basename = "pmu";
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break;
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case pmac_i2c_bus_smu:
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/* This is not what we used to do but I'm fixing drivers at
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* the same time as this change
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*/
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basename = "smu";
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break;
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default:
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return -EINVAL;
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}
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snprintf(adapter->name, sizeof(adapter->name), "%s %d", basename,
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pmac_i2c_get_channel(bus));
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of_node_put(parent);
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platform_set_drvdata(dev, adapter);
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adapter->algo = &i2c_powermac_algorithm;
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adapter->quirks = &i2c_powermac_quirks;
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i2c_set_adapdata(adapter, bus);
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adapter->dev.parent = &dev->dev;
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/* Clear of_node to skip automatic registration of i2c child nodes */
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adapter->dev.of_node = NULL;
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rc = i2c_add_adapter(adapter);
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if (rc) {
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printk(KERN_ERR "i2c-powermac: Adapter %s registration "
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"failed\n", adapter->name);
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memset(adapter, 0, sizeof(*adapter));
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return rc;
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}
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printk(KERN_INFO "PowerMac i2c bus %s registered\n", adapter->name);
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/* Use custom child registration due to Apple device-tree funkyness */
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adapter->dev.of_node = dev->dev.of_node;
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i2c_powermac_register_devices(adapter, bus);
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return 0;
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}
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static struct platform_driver i2c_powermac_driver = {
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.probe = i2c_powermac_probe,
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.remove = i2c_powermac_remove,
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.driver = {
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.name = "i2c-powermac",
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.bus = &platform_bus_type,
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},
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};
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module_platform_driver(i2c_powermac_driver);
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MODULE_ALIAS("platform:i2c-powermac");
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