Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751704AbdGZRNf (ORCPT ); Wed, 26 Jul 2017 13:13:35 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:50574 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751413AbdGZRNc (ORCPT ); Wed, 26 Jul 2017 13:13:32 -0400 From: Eddie James To: linux-kernel@vger.kernel.org Cc: linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, wsa@the-dreams.de, robh+dt@kernel.org, jk@ozlabs.org, joel@jms.id.au, andrew@aj.id.au, cbostic@linux.vnet.ibm.com, eajames@linux.vnet.ibm.com, "Edward A. James" Subject: [PATCH v5 2/6] drivers/i2c: Add port structure to FSI algorithm Date: Wed, 26 Jul 2017 12:13:14 -0500 X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1501089198-10356-1-git-send-email-eajames@linux.vnet.ibm.com> References: <1501089198-10356-1-git-send-email-eajames@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 17072617-0004-0000-0000-000012A7AE6F X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00007430; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000214; SDB=6.00893242; UDB=6.00446543; IPR=6.00673406; BA=6.00005492; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00016390; XFM=3.00000015; UTC=2017-07-26 17:13:29 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17072617-0005-0000-0000-0000806A570D Message-Id: <1501089198-10356-3-git-send-email-eajames@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-07-26_07:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=1 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1706020000 definitions=main-1707260249 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3869 Lines: 168 From: "Edward A. James" 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: Edward A. James --- drivers/i2c/busses/i2c-fsi.c | 96 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 96 insertions(+) diff --git a/drivers/i2c/busses/i2c-fsi.c b/drivers/i2c/busses/i2c-fsi.c index 79475f8..4ad5d68 100644 --- a/drivers/i2c/busses/i2c-fsi.c +++ b/drivers/i2c/busses/i2c-fsi.c @@ -14,7 +14,9 @@ #include #include #include +#include #include +#include #define FSI_ENGID_I2C 0x7 @@ -130,6 +132,14 @@ 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, @@ -186,9 +196,44 @@ static int fsi_i2c_dev_init(struct fsi_i2c_master *i2c) return rc; } +static int fsi_i2c_set_port(struct fsi_i2c_port *port) +{ + int rc; + struct fsi_device *fsi = port->master->fsi; + u32 mode, dummy = 0; + u16 old_port; + + rc = fsi_i2c_read_reg(fsi, I2C_FSI_MODE, &mode); + if (rc) + return rc; + + old_port = GETFIELD(I2C_MODE_PORT, mode); + + if (old_port != port->port) { + mode = SETFIELD(I2C_MODE_PORT, mode, port->port); + rc = fsi_i2c_write_reg(fsi, I2C_FSI_MODE, &mode); + if (rc) + return rc; + + /* reset engine when port is changed */ + rc = fsi_i2c_write_reg(fsi, I2C_FSI_RESET_ERR, &dummy); + if (rc) + return rc; + } + + return rc; +} + 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; } @@ -206,23 +251,73 @@ static u32 fsi_i2c_functionality(struct i2c_adapter *adap) 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 = devm_kzalloc(dev, 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); + devm_kfree(dev, 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; + + if (!list_empty(&i2c->ports)) { + list_for_each_entry(port, &i2c->ports, list) { + i2c_del_adapter(&port->adapter); + } + } + + return 0; +} + static const struct fsi_device_id fsi_i2c_ids[] = { { FSI_ENGID_I2C, FSI_VERSION_ANY }, { 0 } @@ -234,6 +329,7 @@ static int fsi_i2c_probe(struct device *dev) .name = "i2c-fsi", .bus = &fsi_bus_type, .probe = fsi_i2c_probe, + .remove = fsi_i2c_remove, }, }; -- 1.8.3.1