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i2c: fsi: Add port structures 

Add and initialize I2C adapters for each port on the FSI-attached I2C
master. Ports for each master are defined in the devicetree.

Signed-off-by: Eddie James <eajames@linux.vnet.ibm.com>
Tested-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
hifive-unleashed-5.1
Eddie James 2018-07-17 10:31:01 -05:00 committed by Wolfram Sang
parent d6ffb63001
commit 19b4887af7
1 changed files with 91 additions and 0 deletions
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91
drivers/i2c/busses/i2c-fsi.c
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@ -17,7 +17,10 @@
#include <linux/fsi.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/slab.h>
#define FSI_ENGID_I2C 0x7
@ -128,6 +131,14 @@
struct fsi_i2c_master {
struct fsi_device *fsi;
u8 fifo_size;
struct list_head ports;
};
struct fsi_i2c_port {
struct list_head list;
struct i2c_adapter adapter;
struct fsi_i2c_master *master;
u16 port;
};
static int fsi_i2c_read_reg(struct fsi_device *fsi, unsigned int reg,
@ -181,9 +192,38 @@ static int fsi_i2c_dev_init(struct fsi_i2c_master *i2c)
return fsi_i2c_write_reg(i2c->fsi, I2C_FSI_WATER_MARK, &watermark);
}
static int fsi_i2c_set_port(struct fsi_i2c_port *port)
{
int rc;
struct fsi_device *fsi = port->master->fsi;
u32 mode, dummy = 0;
rc = fsi_i2c_read_reg(fsi, I2C_FSI_MODE, &mode);
if (rc)
return rc;
if (FIELD_GET(I2C_MODE_PORT, mode) == port->port)
return 0;
mode = (mode & ~I2C_MODE_PORT) | FIELD_PREP(I2C_MODE_PORT, port->port);
rc = fsi_i2c_write_reg(fsi, I2C_FSI_MODE, &mode);
if (rc)
return rc;
/* reset engine when port is changed */
return fsi_i2c_write_reg(fsi, I2C_FSI_RESET_ERR, &dummy);
}
static int fsi_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
int num)
{
int rc;
struct fsi_i2c_port *port = adap->algo_data;
rc = fsi_i2c_set_port(port);
if (rc)
return rc;
return -EOPNOTSUPP;
}
@ -201,23 +241,73 @@ static const struct i2c_algorithm fsi_i2c_algorithm = {
static int fsi_i2c_probe(struct device *dev)
{
struct fsi_i2c_master *i2c;
struct fsi_i2c_port *port;
struct device_node *np;
int rc;
u32 port_no;
i2c = devm_kzalloc(dev, sizeof(*i2c), GFP_KERNEL);
if (!i2c)
return -ENOMEM;
i2c->fsi = to_fsi_dev(dev);
INIT_LIST_HEAD(&i2c->ports);
rc = fsi_i2c_dev_init(i2c);
if (rc)
return rc;
/* Add adapter for each i2c port of the master. */
for_each_available_child_of_node(dev->of_node, np) {
rc = of_property_read_u32(np, "reg", &port_no);
if (rc || port_no > USHRT_MAX)
continue;
port = kzalloc(sizeof(*port), GFP_KERNEL);
if (!port)
break;
port->master = i2c;
port->port = port_no;
port->adapter.owner = THIS_MODULE;
port->adapter.dev.of_node = np;
port->adapter.dev.parent = dev;
port->adapter.algo = &fsi_i2c_algorithm;
port->adapter.algo_data = port;
snprintf(port->adapter.name, sizeof(port->adapter.name),
"i2c_bus-%u", port_no);
rc = i2c_add_adapter(&port->adapter);
if (rc < 0) {
dev_err(dev, "Failed to register adapter: %d\n", rc);
kfree(port);
continue;
}
list_add(&port->list, &i2c->ports);
}
dev_set_drvdata(dev, i2c);
return 0;
}
static int fsi_i2c_remove(struct device *dev)
{
struct fsi_i2c_master *i2c = dev_get_drvdata(dev);
struct fsi_i2c_port *port, *tmp;
list_for_each_entry_safe(port, tmp, &i2c->ports, list) {
list_del(&port->list);
i2c_del_adapter(&port->adapter);
kfree(port);
}
return 0;
}
static const struct fsi_device_id fsi_i2c_ids[] = {
{ FSI_ENGID_I2C, FSI_VERSION_ANY },
{ }
@ -229,6 +319,7 @@ static struct fsi_driver fsi_i2c_driver = {
.name = "i2c-fsi",
.bus = &fsi_bus_type,
.probe = fsi_i2c_probe,
.remove = fsi_i2c_remove,
},
};