[PATCH linux dev-4.10 2/2] drivers: hwmon: occ: Add P8 OCC access
Eddie James
eajames at linux.vnet.ibm.com
Fri Jun 9 06:25:51 AEST 2017
From: "Edward A. James" <eajames at us.ibm.com>
Access the P8 OCC over I2C bus.
Signed-off-by: Edward A. James <eajames at us.ibm.com>
---
drivers/hwmon/Makefile | 2 +-
drivers/hwmon/occ/Kconfig | 19 ++-
drivers/hwmon/occ/Makefile | 12 +-
drivers/hwmon/occ/p8_i2c.c | 282 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 312 insertions(+), 3 deletions(-)
create mode 100644 drivers/hwmon/occ/p8_i2c.c
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 73d79bc..4b7c15f 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -47,7 +47,6 @@ obj-$(CONFIG_SENSORS_APPLESMC) += applesmc.o
obj-$(CONFIG_SENSORS_ARM_SCPI) += scpi-hwmon.o
obj-$(CONFIG_SENSORS_ASC7621) += asc7621.o
obj-$(CONFIG_SENSORS_ASPEED) += aspeed-pwm-tacho.o
-obj-$(CONFIG_SENSORS_OCC_P9_SBE) += occ/
obj-$(CONFIG_SENSORS_ATXP1) += atxp1.o
obj-$(CONFIG_SENSORS_CORETEMP) += coretemp.o
obj-$(CONFIG_SENSORS_DA9052_ADC)+= da9052-hwmon.o
@@ -172,6 +171,7 @@ obj-$(CONFIG_SENSORS_WM831X) += wm831x-hwmon.o
obj-$(CONFIG_SENSORS_WM8350) += wm8350-hwmon.o
obj-$(CONFIG_SENSORS_XGENE) += xgene-hwmon.o
+obj-$(CONFIG_SENSORS_OCC) += occ/
obj-$(CONFIG_PMBUS) += pmbus/
ccflags-$(CONFIG_HWMON_DEBUG_CHIP) := -DDEBUG
diff --git a/drivers/hwmon/occ/Kconfig b/drivers/hwmon/occ/Kconfig
index 8196b50..4024dc0 100644
--- a/drivers/hwmon/occ/Kconfig
+++ b/drivers/hwmon/occ/Kconfig
@@ -2,9 +2,26 @@
# On-Chip Controller configuration
#
+config SENSORS_OCC
+ tristate "POWER On-Chip Controller"
+ help
+ If you say yes here you get support for monitoring the IBM POWER
+ processor sensors via the On-Chip Controller (OCC).
+
+ This driver can also be built as a module. If so, the module will be
+ called occ-hwmon.
+
+config SENSORS_OCC_P8_I2C
+ bool "POWER8 OCC via I2C"
+ depends on I2C && SENSORS_OCC
+ help
+ If you say yes here you get support for monitoring the POWER8
+ processor sensors via the OCC, from a service processor, over I2C
+ bus.
+
config SENSORS_OCC_P9_SBE
bool "POWER9 OCC via SBE"
- depends on OCCFIFO
+ depends on OCCFIFO && SENSORS_OCC
help
If you say yes here you get support for monitoring the POWER9
processor sensors via the OCC, from a service processor, over SBE
diff --git a/drivers/hwmon/occ/Makefile b/drivers/hwmon/occ/Makefile
index 6245c25..ab5c3e9 100644
--- a/drivers/hwmon/occ/Makefile
+++ b/drivers/hwmon/occ/Makefile
@@ -1 +1,11 @@
-obj-y += p9_sbe.o common.o
+occ-hwmon-objs := common.o
+
+ifeq ($(CONFIG_SENSORS_OCC_P9_SBE), y)
+occ-hwmon-objs += p9_sbe.o
+endif
+
+ifeq ($(CONFIG_SENSORS_OCC_P8_I2C), y)
+occ-hwmon-objs += p8_i2c.o
+endif
+
+obj-$(CONFIG_SENSORS_OCC) += occ-hwmon.o
diff --git a/drivers/hwmon/occ/p8_i2c.c b/drivers/hwmon/occ/p8_i2c.c
new file mode 100644
index 0000000..a15467a
--- /dev/null
+++ b/drivers/hwmon/occ/p8_i2c.c
@@ -0,0 +1,282 @@
+/*
+ * Copyright 2017 IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <asm/unaligned.h>
+#include "common.h"
+#include <linux/hwmon.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/module.h>
+
+#define OCC_TIMEOUT_MS 5000
+#define OCC_CMD_IN_PRG_MS 100
+
+#define RESP_RETURN_CMD_IN_PRG 0xFF
+#define RESP_RETURN_SUCCESS 0
+#define RESP_RETURN_CMD_INVAL 0x11
+#define RESP_RETURN_CMD_LEN 0x12
+#define RESP_RETURN_DATA_INVAL 0x13
+#define RESP_RETURN_CHKSUM 0x14
+#define RESP_RETURN_OCC_ERR 0x15
+#define RESP_RETURN_STATE 0x16
+
+struct p8_i2c_occ {
+ struct occ occ;
+ struct i2c_client *client;
+};
+
+#define to_p8_i2c_occ(x) container_of((x), struct p8_i2c_occ, occ)
+
+static int p8_i2c_occ_getscom(struct i2c_client *client, u32 address, u8 *data)
+{
+ ssize_t rc;
+ __be64 buf_be;
+ u64 buf;
+ struct i2c_msg msgs[2];
+
+ address <<= 1;
+
+ msgs[0].addr = client->addr;
+ msgs[0].flags = client->flags & I2C_M_TEN;
+ msgs[0].len = sizeof(u32);
+ msgs[0].buf = (char *)&address;
+
+
+ msgs[1].addr = client->addr;
+ msgs[1].flags = (client->flags & I2C_M_TEN) | I2C_M_RD;
+ msgs[1].len = sizeof(u64);
+ msgs[1].buf = (char *)&buf_be;
+
+ rc = i2c_transfer(client->adapter, msgs, 2);
+ if (rc < 0)
+ return rc;
+
+ buf = be64_to_cpu(buf_be);
+ memcpy(data, &buf, sizeof(u64));
+
+ return 0;
+}
+
+static int p8_i2c_occ_putscom(struct i2c_client *client, u32 address, u8 *data)
+{
+ u32 buf[3];
+ ssize_t rc;
+
+ address <<= 1;
+
+ buf[0] = address;
+ memcpy(&buf[1], &data[4], sizeof(u32));
+ memcpy(&buf[2], data, sizeof(u32));
+
+ rc = i2c_master_send(client, (const char *)buf, sizeof(buf));
+ if (rc < 0)
+ return rc;
+ else if (rc != sizeof(buf))
+ return -EIO;
+
+ return 0;
+}
+
+static int p8_i2c_occ_putscom_u32(struct i2c_client *client, u32 address,
+ u32 data0, u32 data1)
+{
+ u8 buf[8];
+
+ memcpy(buf, &data0, 4);
+ memcpy(buf + 4, &data1, 4);
+
+ return p8_i2c_occ_putscom(client, address, buf);
+}
+
+static int p8_i2c_occ_putscom_be(struct i2c_client *client, u32 address,
+ u8 *data)
+{
+ unsigned int i;
+ u8 buf[8];
+
+ for (i = 0; i < 4; ++i) {
+ buf[i] = data[3 - i];
+ buf[i + 4] = data[7 - i];
+ }
+
+ return p8_i2c_occ_putscom(client, address, buf);
+}
+
+static int p8_i2c_occ_send_cmd(struct occ *occ, u8 *cmd)
+{
+ int i, rc;
+ unsigned long start;
+ u16 data_length;
+ struct p8_i2c_occ *p8_i2c_occ = to_p8_i2c_occ(occ);
+ struct i2c_client *client = p8_i2c_occ->client;
+ struct occ_response *resp = &occ->resp;
+
+ start = jiffies;
+
+ /* set sram address for command */
+ rc = p8_i2c_occ_putscom_u32(client, 0x6B070, 0xFFFF6000, 0);
+ if (rc)
+ goto err;
+
+ /* write command (already be), i2c expects le */
+ rc = p8_i2c_occ_putscom_be(client, 0x6B075, cmd);
+ if (rc)
+ goto err;
+
+ /* trigger OCC attention */
+ rc = p8_i2c_occ_putscom_u32(client, 0x6B035, 0x20010000, 0);
+ if (rc)
+ goto err;
+
+ /* set sram address for response */
+ rc = p8_i2c_occ_putscom_u32(client, 0x6B070, 0xFFFF7000, 0);
+ if (rc)
+ goto err;
+
+retry:
+ rc = p8_i2c_occ_getscom(client, 0x6B075, (u8 *)resp);
+ if (rc)
+ goto err;
+
+ /* check the occ response */
+ switch (resp->return_status) {
+ case RESP_RETURN_CMD_IN_PRG:
+ if (time_after(jiffies,
+ start + msecs_to_jiffies(OCC_TIMEOUT_MS)))
+ rc = -EALREADY;
+ else {
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule_timeout(msecs_to_jiffies(OCC_CMD_IN_PRG_MS));
+
+ goto retry;
+ }
+ break;
+ case RESP_RETURN_SUCCESS:
+ rc = 0;
+ break;
+ case RESP_RETURN_CMD_INVAL:
+ case RESP_RETURN_CMD_LEN:
+ case RESP_RETURN_DATA_INVAL:
+ case RESP_RETURN_CHKSUM:
+ rc = -EINVAL;
+ break;
+ case RESP_RETURN_OCC_ERR:
+ rc = -EREMOTE;
+ break;
+ default:
+ rc = -EFAULT;
+ }
+
+ if (rc < 0) {
+ dev_warn(&client->dev, "occ bad response:%d\n",
+ resp->return_status);
+ return rc;
+ }
+
+ data_length = get_unaligned_be16(&resp->data_length_be);
+ if (data_length > OCC_RESP_DATA_BYTES) {
+ dev_warn(&client->dev, "occ bad data length:%d\n",
+ data_length);
+ return -EDOM;
+ }
+
+ for (i = 8; i < data_length + 7; i += 8) {
+ rc = p8_i2c_occ_getscom(client, 0x6B075, ((u8 *)resp) + i);
+ if (rc)
+ goto err;
+ }
+
+ return data_length + 7;
+
+err:
+ dev_err(&client->dev, "i2c scom op failed rc:%d\n", rc);
+ return rc;
+}
+
+static int p8_i2c_occ_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int rc;
+ struct occ *occ;
+ struct p8_i2c_occ *p8_i2c_occ = devm_kzalloc(&client->dev,
+ sizeof(*p8_i2c_occ),
+ GFP_KERNEL);
+ if (!p8_i2c_occ)
+ return -ENOMEM;
+
+ p8_i2c_occ->client = client;
+
+ occ = &p8_i2c_occ->occ;
+ occ->bus_dev = &client->dev;
+ occ->groups[0] = &occ->group;
+ occ->poll_cmd_data = 0x10;
+ occ->send_cmd = p8_i2c_occ_send_cmd;
+ mutex_init(&occ->lock);
+
+ dev_set_drvdata(&client->dev, occ);
+
+ /* no need to lock yet */
+ rc = occ_poll(occ);
+ if (rc < 0) {
+ dev_err(occ->bus_dev, "failed to get OCC poll response: %d\n",
+ rc);
+ return rc;
+ }
+
+ occ_parse_poll_response(occ);
+
+ rc = occ_setup_sensor_attrs(occ);
+ if (rc) {
+ dev_err(occ->bus_dev, "failed to setup p8 attrs: %d\n", rc);
+ return rc;
+ }
+
+ occ->hwmon = devm_hwmon_device_register_with_groups(occ->bus_dev,
+ "p8_occ", occ,
+ occ->groups);
+ if (IS_ERR(occ->hwmon)) {
+ rc = PTR_ERR(occ->hwmon);
+ dev_err(occ->bus_dev, "failed to register hwmon device: %d\n",
+ rc);
+ return rc;
+ }
+
+ rc = occ_create_status_attrs(occ);
+ if (rc) {
+ dev_err(occ->bus_dev, "failed to setup p8 status attrs: %d\n",
+ rc);
+ return rc;
+ }
+
+ return 0;
+}
+
+static const struct of_device_id p8_i2c_occ_of_match[] = {
+ { .compatible = "ibm,p8-occ-hwmon" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, p8_i2c_occ_of_match);
+
+static const unsigned short p8_i2c_occ_addr[] = { 0x50, 0x51, I2C_CLIENT_END };
+
+static struct i2c_driver p8_i2c_occ_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = "occ-hwmon",
+ .of_match_table = p8_i2c_occ_of_match,
+ },
+ .probe = p8_i2c_occ_probe,
+ .address_list = p8_i2c_occ_addr,
+};
+
+module_i2c_driver(p8_i2c_occ_driver);
+
+MODULE_AUTHOR("Eddie James <eajames at us.ibm.com>");
+MODULE_DESCRIPTION("BMC P8 OCC hwmon driver");
+MODULE_LICENSE("GPL");
--
1.8.3.1
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