diff options
author | Eddie James <eajames@linux.vnet.ibm.com> | 2018-07-17 10:31:01 -0500 |
---|---|---|
committer | Wolfram Sang <wsa@the-dreams.de> | 2018-07-21 00:07:07 +0200 |
commit | 19b4887af7155a224b7d07301463ea32349b9965 (patch) | |
tree | e9aa016e1edc904821b308a2cb66746dd048c69d /drivers | |
parent | d6ffb63001167053cc7af889543ca8284beee0dd (diff) | |
download | linux-19b4887af7155a224b7d07301463ea32349b9965.tar.bz2 |
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>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/i2c/busses/i2c-fsi.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-fsi.c b/drivers/i2c/busses/i2c-fsi.c index 3725db1cc1f1..1d9e9bf60a9e 100644 --- a/drivers/i2c/busses/i2c-fsi.c +++ b/drivers/i2c/busses/i2c-fsi.c @@ -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, }, }; |