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Tue, 21 Feb 2023 21:26:31 +0000 (GMT) From: Eddie James To: linux-fsi@lists.ozlabs.org Cc: rostedt@goodmis.org, linux-trace-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, mhiramat@kernel.org, alistair@popple.id.au, joel@jms.id.au, jk@ozlabs.org, andrew@aj.id.au, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, eajames@linux.ibm.com Subject: [PATCH v5 4/6] fsi: Add I2C Responder SCOM driver Date: Tue, 21 Feb 2023 15:26:20 -0600 Message-Id: <20230221212622.3897097-5-eajames@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230221212622.3897097-1-eajames@linux.ibm.com> References: <20230221212622.3897097-1-eajames@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: rCHA6uGqnlQ9G7oA-E6CktJEwHqQ-v51 X-Proofpoint-GUID: rCHA6uGqnlQ9G7oA-E6CktJEwHqQ-v51 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.170.22 definitions=2023-02-21_12,2023-02-20_02,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 mlxscore=0 mlxlogscore=999 bulkscore=0 phishscore=0 suspectscore=0 priorityscore=1501 lowpriorityscore=0 adultscore=0 spamscore=0 clxscore=1015 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2302210182 X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1758477603130033831?= X-GMAIL-MSGID: =?utf-8?q?1758477603130033831?= The I2CR has the capability to directly perform SCOM operations, circumventing the need to drive the FSI2PIB engine. Add a new driver to perform SCOM operations through the I2CR. Signed-off-by: Eddie James --- drivers/fsi/Kconfig | 12 +++ drivers/fsi/Makefile | 1 + drivers/fsi/i2cr-scom.c | 158 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 171 insertions(+) create mode 100644 drivers/fsi/i2cr-scom.c diff --git a/drivers/fsi/Kconfig b/drivers/fsi/Kconfig index 999be82720c5..09a8285d4bdc 100644 --- a/drivers/fsi/Kconfig +++ b/drivers/fsi/Kconfig @@ -71,6 +71,18 @@ config FSI_MASTER_I2CR that translates I2C commands to CFAM or SCOM operations, effectively implementing an FSI master and bus. +if FSI_MASTER_I2CR + +config I2CR_SCOM + tristate "IBM I2C Responder SCOM driver" + default y + help + This option enables an I2C Responder based SCOM device driver. The + I2CR has the capability to directly perform SCOM operations instead + of using the FSI2PIB engine. + +endif + config FSI_SCOM tristate "SCOM FSI client device driver" help diff --git a/drivers/fsi/Makefile b/drivers/fsi/Makefile index 34dbaa1c452e..5550aa15e0b1 100644 --- a/drivers/fsi/Makefile +++ b/drivers/fsi/Makefile @@ -9,3 +9,4 @@ obj-$(CONFIG_FSI_MASTER_AST_CF) += fsi-master-ast-cf.o obj-$(CONFIG_FSI_SCOM) += fsi-scom.o obj-$(CONFIG_FSI_SBEFIFO) += fsi-sbefifo.o obj-$(CONFIG_FSI_OCC) += fsi-occ.o +obj-$(CONFIG_I2CR_SCOM) += i2cr-scom.o diff --git a/drivers/fsi/i2cr-scom.c b/drivers/fsi/i2cr-scom.c new file mode 100644 index 000000000000..7e1c7b93c32f --- /dev/null +++ b/drivers/fsi/i2cr-scom.c @@ -0,0 +1,158 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) IBM Corporation 2023 */ + +#include +#include +#include +#include +#include +#include + +#include "fsi-master-i2cr.h" +#include "fsi-slave.h" + +struct i2cr_scom { + struct device dev; + struct cdev cdev; + struct fsi_master_i2cr *i2cr; +}; + +static loff_t i2cr_scom_llseek(struct file *file, loff_t offset, int whence) +{ + switch (whence) { + case SEEK_CUR: + break; + case SEEK_SET: + file->f_pos = offset; + break; + default: + return -EINVAL; + } + + return offset; +} + +static ssize_t i2cr_scom_read(struct file *filep, char __user *buf, size_t len, loff_t *offset) +{ + struct i2cr_scom *scom = filep->private_data; + __be64 data_be; + u64 data; + int ret; + + if (len != sizeof(data)) + return -EINVAL; + + ret = fsi_master_i2cr_read(scom->i2cr, (u32)*offset, &data_be, sizeof(data_be)); + if (ret) + return ret; + + data = be64_to_cpu(data_be); + ret = copy_to_user(buf, &data, len); + if (ret) + return ret; + + return len; +} + +static ssize_t i2cr_scom_write(struct file *filep, const char __user *buf, size_t len, + loff_t *offset) +{ + struct i2cr_scom *scom = filep->private_data; + __be64 data_be; + u64 data; + int ret; + + if (len != sizeof(data)) + return -EINVAL; + + ret = copy_from_user(&data, buf, len); + if (ret) + return ret; + + data_be = cpu_to_be64(data); + ret = fsi_master_i2cr_write(scom->i2cr, (u32)*offset, &data_be, sizeof(data_be)); + if (ret) + return ret; + + return len; +} + +static const struct file_operations i2cr_scom_fops = { + .owner = THIS_MODULE, + .open = simple_open, + .llseek = i2cr_scom_llseek, + .read = i2cr_scom_read, + .write = i2cr_scom_write, +}; + +static int i2cr_scom_probe(struct device *dev) +{ + struct fsi_device *fsi_dev = to_fsi_dev(dev); + struct i2cr_scom *scom; + int didx; + int ret; + + if (!(fsi_dev->slave->master->flags & FSI_MASTER_FLAG_I2CR)) + return -ENODEV; + + scom = devm_kzalloc(dev, sizeof(*scom), GFP_KERNEL); + if (!scom) + return -ENOMEM; + + scom->i2cr = to_fsi_master_i2cr(fsi_dev->slave->master); + dev_set_drvdata(dev, scom); + + scom->dev.type = &fsi_cdev_type; + scom->dev.parent = dev; + device_initialize(&scom->dev); + + ret = fsi_get_new_minor(fsi_dev, fsi_dev_scom, &scom->dev.devt, &didx); + if (ret) + return ret; + + dev_set_name(&scom->dev, "scom%d", didx); + cdev_init(&scom->cdev, &i2cr_scom_fops); + ret = cdev_device_add(&scom->cdev, &scom->dev); + if (ret) + fsi_free_minor(scom->dev.devt); + + return ret; +} + +static int i2cr_scom_remove(struct device *dev) +{ + struct i2cr_scom *scom = dev_get_drvdata(dev); + + cdev_device_del(&scom->cdev, &scom->dev); + fsi_free_minor(scom->dev.devt); + + return 0; +} + +static const struct of_device_id i2cr_scom_of_ids[] = { + { .compatible = "ibm,i2cr-scom" }, + { } +}; +MODULE_DEVICE_TABLE(of, i2cr_scom_of_ids); + +static const struct fsi_device_id i2cr_scom_ids[] = { + { 0x5, FSI_VERSION_ANY }, + { } +}; + +static struct fsi_driver i2cr_scom_driver = { + .id_table = i2cr_scom_ids, + .drv = { + .name = "i2cr_scom", + .bus = &fsi_bus_type, + .of_match_table = i2cr_scom_of_ids, + .probe = i2cr_scom_probe, + .remove = i2cr_scom_remove, + } +}; + +module_fsi_driver(i2cr_scom_driver); + +MODULE_AUTHOR("Eddie James "); +MODULE_DESCRIPTION("IBM I2C Responder SCOM driver"); +MODULE_LICENSE("GPL");