This commits adds SSIF BMC driver specifically for Aspeed AST2500 which
commonly used as Board Management Controllers.
Signed-off-by: Quan Nguyen <quan@xxxxxxxxxxxxxxxxxxxxxx>
---
v3:
+ Splited into separate commit [Corey, Joel]
+ Invoked aspeed-specific aspeed_set_slave_busy() when busy
to address deadlock from Graeme and comment from Philipp
+ Combined two interrupts to mask/unmask together [Corey]
drivers/char/ipmi/Kconfig | 11 +++++
drivers/char/ipmi/Makefile | 1 +
drivers/char/ipmi/ssif_bmc_aspeed.c | 75 +++++++++++++++++++++++++++++
3 files changed, 87 insertions(+)
create mode 100644 drivers/char/ipmi/ssif_bmc_aspeed.c
diff --git a/drivers/char/ipmi/Kconfig b/drivers/char/ipmi/Kconfig
index ad5c5161bcd6..45be57023577 100644
--- a/drivers/char/ipmi/Kconfig
+++ b/drivers/char/ipmi/Kconfig
@@ -144,6 +144,17 @@ config SSIF_IPMI_BMC
The driver implements the BMC side of the SMBus system
interface (SSIF).
+config ASPEED_SSIF_IPMI_BMC
+ depends on ARCH_ASPEED || COMPILE_TEST
+ select SSIF_IPMI_BMC
+ tristate "Aspeed SSIF IPMI BMC driver"
+ help
+ Provides a driver for the SSIF IPMI interface found on
+ Aspeed AST2500 SoC.
+
+ The driver implements the BMC side of the SMBus system
+ interface (SSIF), specific for Aspeed AST2500 SoC.
+
config IPMB_DEVICE_INTERFACE
tristate 'IPMB Interface handler'
depends on I2C
diff --git a/drivers/char/ipmi/Makefile b/drivers/char/ipmi/Makefile
index d04a214d74c4..05b993f7335b 100644
--- a/drivers/char/ipmi/Makefile
+++ b/drivers/char/ipmi/Makefile
@@ -28,3 +28,4 @@ obj-$(CONFIG_ASPEED_KCS_IPMI_BMC) += kcs_bmc_aspeed.o
obj-$(CONFIG_NPCM7XX_KCS_IPMI_BMC) += kcs_bmc_npcm7xx.o
obj-$(CONFIG_IPMB_DEVICE_INTERFACE) += ipmb_dev_int.o
obj-$(CONFIG_SSIF_IPMI_BMC) += ssif_bmc.o
+obj-$(CONFIG_ASPEED_SSIF_IPMI_BMC) += ssif_bmc_aspeed.o
diff --git a/drivers/char/ipmi/ssif_bmc_aspeed.c b/drivers/char/ipmi/ssif_bmc_aspeed.c
new file mode 100644
index 000000000000..019e51e16a7e
--- /dev/null
+++ b/drivers/char/ipmi/ssif_bmc_aspeed.c
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * The driver for BMC side of Aspeed SSIF interface
+ * Copyright (c) 2021, Ampere Computing LLC
+ */
+
+#include <linux/i2c.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/poll.h>
+#include <linux/iopoll.h>
+
+#include "ssif_bmc.h"
+
+extern void aspeed_set_slave_busy(struct i2c_adapter *adap, bool busy);
+static void aspeed_set_ssif_bmc_status(struct ssif_bmc_ctx *ssif_bmc, unsigned int status)
+{
+ if (status & SSIF_BMC_BUSY)
+ aspeed_set_slave_busy((struct i2c_adapter *)ssif_bmc->priv, true);
+ else if (status & SSIF_BMC_READY)
+ aspeed_set_slave_busy((struct i2c_adapter *)ssif_bmc->priv, false);
+}
+
+static int ssif_bmc_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+ struct ssif_bmc_ctx *ssif_bmc;
+
+ ssif_bmc = ssif_bmc_alloc(client, 0);
+ if (IS_ERR(ssif_bmc))
+ return PTR_ERR(ssif_bmc);
+
+ ssif_bmc->priv = i2c_get_adapdata(client->adapter);
+ ssif_bmc->set_ssif_bmc_status = aspeed_set_ssif_bmc_status;
+
+ return 0;
+}
+
+static int ssif_bmc_remove(struct i2c_client *client)
+{
+ struct ssif_bmc_ctx *ssif_bmc = i2c_get_clientdata(client);
+
+ i2c_slave_unregister(client);
+ misc_deregister(&ssif_bmc->miscdev);
+
+ return 0;
+}
+
+static const struct of_device_id ssif_bmc_match[] = {
+ { .compatible = "aspeed,ast2500-ssif-bmc" },
+ { },
+};
+
+static const struct i2c_device_id ssif_bmc_id[] = {
+ { DEVICE_NAME, 0 },
+ { },
+};
+
+MODULE_DEVICE_TABLE(i2c, ssif_bmc_id);
+
+static struct i2c_driver ssif_bmc_driver = {
+ .driver = {
+ .name = DEVICE_NAME,
+ .of_match_table = ssif_bmc_match,
+ },
+ .probe = ssif_bmc_probe,
+ .remove = ssif_bmc_remove,
+ .id_table = ssif_bmc_id,
+};
+
+module_i2c_driver(ssif_bmc_driver);
+
+MODULE_AUTHOR("Chuong Tran <chuong@xxxxxxxxxxxxxxxxxxxxxx>");
+MODULE_AUTHOR("Quan Nguyen <quan@xxxxxxxxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Linux device driver of Aspeed BMC IPMI SSIF interface.");
+MODULE_LICENSE("GPL v2");
--
2.28.0
