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Tue, 21 Feb 2023 21:26:29 +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 3/6] fsi: Add IBM I2C Responder virtual FSI master Date: Tue, 21 Feb 2023 15:26:19 -0600 Message-Id: <20230221212622.3897097-4-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: vP79WBBjLuxHXwliBQGRDaZAIIZh9eZ0 X-Proofpoint-GUID: vP79WBBjLuxHXwliBQGRDaZAIIZh9eZ0 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 mlxlogscore=999 malwarescore=0 mlxscore=0 priorityscore=1501 phishscore=0 impostorscore=0 lowpriorityscore=0 clxscore=1015 suspectscore=0 spamscore=0 bulkscore=0 adultscore=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?1758477528620088614?= X-GMAIL-MSGID: =?utf-8?q?1758477670668835340?= The I2C Responder (I2CR) is an I2C device that translates I2C commands to CFAM or SCOM operations, effectively implementing an FSI master and bus. Signed-off-by: Eddie James --- Changes since v4: - Split the read/write functions into the FSI master register access functions and generic functions that can do the SCOMs - Rework the trace events to handle variable data size and fix the trace structure alignment/padding - Add a check on the status register during probe to avoid registering the FSI master if the device isn't there drivers/fsi/Kconfig | 9 + drivers/fsi/Makefile | 1 + drivers/fsi/fsi-master-i2cr.c | 228 +++++++++++++++++++++++++ drivers/fsi/fsi-master-i2cr.h | 24 +++ drivers/fsi/fsi-master.h | 1 + include/trace/events/fsi_master_i2cr.h | 109 ++++++++++++ 6 files changed, 372 insertions(+) create mode 100644 drivers/fsi/fsi-master-i2cr.c create mode 100644 drivers/fsi/fsi-master-i2cr.h create mode 100644 include/trace/events/fsi_master_i2cr.h diff --git a/drivers/fsi/Kconfig b/drivers/fsi/Kconfig index e6668a869913..999be82720c5 100644 --- a/drivers/fsi/Kconfig +++ b/drivers/fsi/Kconfig @@ -62,6 +62,15 @@ config FSI_MASTER_ASPEED Enable it for your BMC kernel in an OpenPower or IBM Power system. +config FSI_MASTER_I2CR + tristate "IBM I2C Responder virtual FSI master" + depends on I2C + help + This option enables a virtual FSI master in order to access a CFAM + behind an IBM I2C Responder (I2CR) chip. The I2CR is an I2C device + that translates I2C commands to CFAM or SCOM operations, effectively + implementing an FSI master and bus. + config FSI_SCOM tristate "SCOM FSI client device driver" help diff --git a/drivers/fsi/Makefile b/drivers/fsi/Makefile index da218a1ad8e1..34dbaa1c452e 100644 --- a/drivers/fsi/Makefile +++ b/drivers/fsi/Makefile @@ -4,6 +4,7 @@ obj-$(CONFIG_FSI) += fsi-core.o obj-$(CONFIG_FSI_MASTER_HUB) += fsi-master-hub.o obj-$(CONFIG_FSI_MASTER_ASPEED) += fsi-master-aspeed.o obj-$(CONFIG_FSI_MASTER_GPIO) += fsi-master-gpio.o +obj-$(CONFIG_FSI_MASTER_I2CR) += fsi-master-i2cr.o obj-$(CONFIG_FSI_MASTER_AST_CF) += fsi-master-ast-cf.o obj-$(CONFIG_FSI_SCOM) += fsi-scom.o obj-$(CONFIG_FSI_SBEFIFO) += fsi-sbefifo.o diff --git a/drivers/fsi/fsi-master-i2cr.c b/drivers/fsi/fsi-master-i2cr.c new file mode 100644 index 000000000000..d4ea41cde1ae --- /dev/null +++ b/drivers/fsi/fsi-master-i2cr.c @@ -0,0 +1,228 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) IBM Corporation 2023 */ + +#include +#include +#include +#include +#include +#include + +#include "fsi-master-i2cr.h" + +#define CREATE_TRACE_POINTS +#include + +#define I2CR_ADDRESS_CFAM(a) ((a) >> 2) +#define I2CR_STATUS 0x30001 +#define I2CR_STATUS_ERR BIT_ULL(61) +#define I2CR_ERROR 0x30002 + +static bool i2cr_check_parity(u32 v, bool parity) +{ + u32 i; + + for (i = 0; i < 32; ++i) { + if (v & (1 << i)) + parity = !parity; + } + + return parity; +} + +static __be32 i2cr_get_command(u32 address, bool parity) +{ + address <<= 1; + + if (i2cr_check_parity(address, parity)) + address |= 1; + + return cpu_to_be32(address); +} + +static int i2cr_transfer(struct i2c_client *client, u32 address, __be64 *data) +{ + struct i2c_msg msgs[2]; + __be32 command; + int ret; + + command = i2cr_get_command(address, true); + msgs[0].addr = client->addr; + msgs[0].flags = 0; + msgs[0].len = sizeof(command); + msgs[0].buf = (__u8 *)&command; + msgs[1].addr = client->addr; + msgs[1].flags = I2C_M_RD; + msgs[1].len = sizeof(*data); + msgs[1].buf = (__u8 *)data; + + ret = i2c_transfer(client->adapter, msgs, 2); + if (ret == 2) + return 0; + + trace_i2cr_i2c_error(client, command, ret); + + if (ret < 0) + return ret; + + return -EIO; +} + +static int i2cr_check_status(struct i2c_client *client) +{ + __be64 status_be = 0; + u64 status; + int ret; + + ret = i2cr_transfer(client, I2CR_STATUS, &status_be); + if (ret) + return ret; + + status = be64_to_cpu(status_be); + if (status & I2CR_STATUS_ERR) { + __be64 error_be = 0; + u64 error; + + i2cr_transfer(client, I2CR_ERROR, &error_be); + error = be64_to_cpu(error_be); + trace_i2cr_status_error(client, status, error); + + dev_err(&client->dev, "status:%016llx error:%016llx\n", status, error); + return -EREMOTEIO; + } + + trace_i2cr_status(client, status); + return 0; +} + +int fsi_master_i2cr_read(struct fsi_master_i2cr *i2cr, u32 addr, void *data, size_t size) +{ + __be64 buf; + int ret; + + mutex_lock(&i2cr->lock); + + ret = i2cr_transfer(i2cr->client, addr, &buf); + if (ret) + goto unlock; + + ret = i2cr_check_status(i2cr->client); + if (ret) + goto unlock; + + memcpy(data, &buf, size); + trace_i2cr_read(i2cr->client, addr, data, size); + +unlock: + mutex_unlock(&i2cr->lock); + return ret; +} + +int fsi_master_i2cr_write(struct fsi_master_i2cr *i2cr, u32 addr, const void *data, size_t size) +{ + u32 buf[3] = { 0 }; + __be32 command; + int ret; + + memcpy(&buf[1], data, size); + command = i2cr_get_command(addr, i2cr_check_parity(buf[1], true)); + memcpy(&buf[0], &command, sizeof(u32)); + + mutex_lock(&i2cr->lock); + + ret = i2c_master_send(i2cr->client, (const char *)buf, sizeof(buf)); + if (ret == sizeof(buf)) { + ret = i2cr_check_status(i2cr->client); + if (!ret) + trace_i2cr_write(i2cr->client, addr, data, size); + } else { + trace_i2cr_i2c_error(i2cr->client, command, ret); + + if (ret >= 0) + ret = -EIO; + } + + mutex_unlock(&i2cr->lock); + return ret; +} + +static int i2cr_read(struct fsi_master *master, int link, uint8_t id, uint32_t addr, void *val, + size_t size) +{ + struct fsi_master_i2cr *i2cr = container_of(master, struct fsi_master_i2cr, master); + + if (link || id || (addr & 0xffff0000) || !(size == 1 || size == 2 || size == 4)) + return -EINVAL; + + return fsi_master_i2cr_read(i2cr, I2CR_ADDRESS_CFAM(addr), val, size); +} + +static int i2cr_write(struct fsi_master *master, int link, uint8_t id, uint32_t addr, + const void *val, size_t size) +{ + struct fsi_master_i2cr *i2cr = container_of(master, struct fsi_master_i2cr, master); + + if (link || id || (addr & 0xffff0000) || !(size == 1 || size == 2 || size == 4)) + return -EINVAL; + + return fsi_master_i2cr_write(i2cr, I2CR_ADDRESS_CFAM(addr), val, size); +} + +static int i2cr_probe(struct i2c_client *client) +{ + struct fsi_master_i2cr *i2cr; + int ret; + + if (i2cr_check_status(client)) + return -ENODEV; + + i2cr = devm_kzalloc(&client->dev, sizeof(*i2cr), GFP_KERNEL); + if (!i2cr) + return -ENOMEM; + + i2cr->master.dev.parent = &client->dev; + i2cr->master.dev.of_node = of_node_get(dev_of_node(&client->dev)); + + i2cr->master.n_links = 1; + i2cr->master.flags = FSI_MASTER_FLAG_I2CR; + i2cr->master.read = i2cr_read; + i2cr->master.write = i2cr_write; + + mutex_init(&i2cr->lock); + i2cr->client = client; + + ret = fsi_master_register(&i2cr->master); + if (ret) + return ret; + + i2c_set_clientdata(client, i2cr); + return 0; +} + +static void i2cr_remove(struct i2c_client *client) +{ + struct fsi_master_i2cr *i2cr = i2c_get_clientdata(client); + + fsi_master_unregister(&i2cr->master); +} + +static const struct of_device_id i2cr_ids[] = { + { .compatible = "ibm,i2cr-fsi-master" }, + { } +}; +MODULE_DEVICE_TABLE(of, i2cr_ids); + +static struct i2c_driver i2cr_driver = { + .probe_new = i2cr_probe, + .remove = i2cr_remove, + .driver = { + .name = "fsi-master-i2cr", + .of_match_table = i2cr_ids, + }, +}; + +module_i2c_driver(i2cr_driver) + +MODULE_AUTHOR("Eddie James "); +MODULE_DESCRIPTION("IBM I2C Responder virtual FSI master driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/fsi/fsi-master-i2cr.h b/drivers/fsi/fsi-master-i2cr.h new file mode 100644 index 000000000000..0e164b3c6d3c --- /dev/null +++ b/drivers/fsi/fsi-master-i2cr.h @@ -0,0 +1,24 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* Copyright (C) IBM Corporation 2023 */ + +#ifndef DRIVERS_FSI_MASTER_I2CR_H +#define DRIVERS_FSI_MASTER_I2CR_H + +#include + +#include "fsi-master.h" + +struct i2c_client; + +struct fsi_master_i2cr { + struct fsi_master master; + struct mutex lock; /* protect HW access */ + struct i2c_client *client; +}; + +#define to_fsi_master_i2cr(m) container_of(m, struct fsi_master_i2cr, master) + +int fsi_master_i2cr_read(struct fsi_master_i2cr *i2cr, u32 addr, void *data, size_t size); +int fsi_master_i2cr_write(struct fsi_master_i2cr *i2cr, u32 addr, const void *data, size_t size); + +#endif /* DRIVERS_FSI_MASTER_I2CR_H */ diff --git a/drivers/fsi/fsi-master.h b/drivers/fsi/fsi-master.h index 967622c1cabf..a1fa315849d2 100644 --- a/drivers/fsi/fsi-master.h +++ b/drivers/fsi/fsi-master.h @@ -111,6 +111,7 @@ /* fsi-master definition and flags */ #define FSI_MASTER_FLAG_SWCLOCK 0x1 +#define FSI_MASTER_FLAG_I2CR 0x2 /* * Structures and function prototypes diff --git a/include/trace/events/fsi_master_i2cr.h b/include/trace/events/fsi_master_i2cr.h new file mode 100644 index 000000000000..bbd7875ee5a6 --- /dev/null +++ b/include/trace/events/fsi_master_i2cr.h @@ -0,0 +1,109 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM fsi_master_i2cr + +#if !defined(_TRACE_FSI_MASTER_I2CR_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_FSI_MASTER_I2CR_H + +#include + +TRACE_EVENT(i2cr_i2c_error, + TP_PROTO(const struct i2c_client *client, __be32 command, int rc), + TP_ARGS(client, command, rc), + TP_STRUCT__entry( + __field(int, bus) + __field(int, rc) + __array(unsigned char, command, sizeof(__be32)) + __field(unsigned short, addr) + ), + TP_fast_assign( + __entry->bus = client->adapter->nr; + __entry->addr = client->addr; + memcpy(__entry->command, &command, sizeof(__be32)); + __entry->rc = rc; + ), + TP_printk("%d-%02x command:{ %*ph } rc:%d", __entry->bus, __entry->addr, + (int)sizeof(__be32), __entry->command, __entry->rc) +); + +TRACE_EVENT(i2cr_read, + TP_PROTO(const struct i2c_client *client, uint32_t address, const void *data, size_t size), + TP_ARGS(client, address, data, size), + TP_STRUCT__entry( + __field(size_t, size) + __field(int, bus) + __field(uint32_t, address) + __array(unsigned char, data, 8) + __field(unsigned short, addr) + ), + TP_fast_assign( + __entry->bus = client->adapter->nr; + __entry->addr = client->addr; + __entry->address = address; + __entry->size = size > 8 ? 8 : size; + memcpy(__entry->data, data, __entry->size); + ), + TP_printk("%d-%02x address:%08x size:%zu { %*ph }", __entry->bus, __entry->addr, + __entry->address, __entry->size, (int)__entry->size, __entry->data) +); + +TRACE_EVENT(i2cr_status, + TP_PROTO(const struct i2c_client *client, uint64_t status), + TP_ARGS(client, status), + TP_STRUCT__entry( + __field(uint64_t, status) + __field(int, bus) + __field(unsigned short, addr) + ), + TP_fast_assign( + __entry->bus = client->adapter->nr; + __entry->addr = client->addr; + __entry->status = status; + ), + TP_printk("%d-%02x %016llx", __entry->bus, __entry->addr, __entry->status) +); + +TRACE_EVENT(i2cr_status_error, + TP_PROTO(const struct i2c_client *client, uint64_t status, uint64_t error), + TP_ARGS(client, status, error), + TP_STRUCT__entry( + __field(uint64_t, error) + __field(uint64_t, status) + __field(int, bus) + __field(unsigned short, addr) + ), + TP_fast_assign( + __entry->bus = client->adapter->nr; + __entry->addr = client->addr; + __entry->error = error; + __entry->status = status; + ), + TP_printk("%d-%02x status:%016llx error:%016llx", __entry->bus, __entry->addr, + __entry->status, __entry->error) +); + +TRACE_EVENT(i2cr_write, + TP_PROTO(const struct i2c_client *client, uint32_t address, const void *data, size_t size), + TP_ARGS(client, address, data, size), + TP_STRUCT__entry( + __field(size_t, size) + __field(int, bus) + __field(uint32_t, address) + __array(unsigned char, data, 8) + __field(unsigned short, addr) + ), + TP_fast_assign( + __entry->bus = client->adapter->nr; + __entry->addr = client->addr; + __entry->address = address; + __entry->size = size > 8 ? 8 : size; + memcpy(__entry->data, data, __entry->size); + ), + TP_printk("%d-%02x address:%08x size:%zu { %*ph }", __entry->bus, __entry->addr, + __entry->address, __entry->size, (int)__entry->size, __entry->data) +); + +#endif + +#include