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fsi/sbefifo: Add driver for the SBE FIFO

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This driver provides an in-kernel and a user API for accessing
the command FIFO of the SBE (Self Boot Engine) of the POWER9
processor, via the FSI bus.

It provides an in-kernel interface to submit command and receive
responses, along with a helper to locate and analyse the response
status block. It's a simple synchronous submit() type API.

The user interface uses the write/read interface that an earlier
version of this driver already provided, however it has some
specific limitations in order to keep the driver simple and
avoid using up a lot of kernel memory:

 - The user should perform a single write() with the command and
   a single read() to get the response (with a buffer big enough
   to hold the entire response).

 - On a write() the command is simply "stored" into a kernel buffer,
   it is submitted as one operation on the subsequent read(). This
   allows to have the code write directly from the FIFO into the user
   buffer and avoid hogging the SBE between the write() and read()
   syscall as it's critical that the SBE be freed asap to respond
   to the host. An extra write() will simply replace the previously
   written command.

 - A write of a single 4 bytes containing the value 0x52534554
   in big endian will trigger a reset request. No read is necessary,
   the write() call will return when the reset has been acknowledged
   or times out.

 - The command is limited to 4K bytes.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Tested-by: Joel Stanley <joel@jms.id.au>
---
This commit is contained in:
Benjamin Herrenschmidt 2018-05-17 15:58:00 +10:00
parent 52b7116e88
commit 9f4a8a2d7f
4 changed files with 1046 additions and 0 deletions
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7
drivers/fsi/Kconfig
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@ -32,4 +32,11 @@ config FSI_SCOM
---help---
This option enables an FSI based SCOM device driver.
config FSI_SBEFIFO
tristate "SBEFIFO FSI client device driver"
---help---
This option enables an FSI based SBEFIFO device driver. The SBEFIFO is
a pipe-like FSI device for communicating with the self boot engine
(SBE) on POWER processors.
endif

1
drivers/fsi/Makefile
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@ -3,3 +3,4 @@ obj-$(CONFIG_FSI) += fsi-core.o
obj-$(CONFIG_FSI_MASTER_HUB) += fsi-master-hub.o
obj-$(CONFIG_FSI_MASTER_GPIO) += fsi-master-gpio.o
obj-$(CONFIG_FSI_SCOM) += fsi-scom.o
obj-$(CONFIG_FSI_SBEFIFO) += fsi-sbefifo.o

1005
drivers/fsi/fsi-sbefifo.c Normal file
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File diff suppressed because it is too large Load Diff

33
include/linux/fsi-sbefifo.h Normal file
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@ -0,0 +1,33 @@
/*
* SBEFIFO FSI Client device driver
*
* Copyright (C) IBM Corporation 2017
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERGCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef LINUX_FSI_SBEFIFO_H
#define LINUX_FSI_SBEFIFO_H
#define SBEFIFO_CMD_PUT_OCC_SRAM 0xa404
#define SBEFIFO_CMD_GET_OCC_SRAM 0xa403
#define SBEFIFO_CMD_GET_SBE_FFDC 0xa801
#define SBEFIFO_MAX_FFDC_SIZE 0x2000
struct device;
int sbefifo_submit(struct device *dev, const __be32 *command, size_t cmd_len,
__be32 *response, size_t *resp_len);
int sbefifo_parse_status(struct device *dev, u16 cmd, __be32 *response,
size_t resp_len, size_t *data_len);
#endif /* LINUX_FSI_SBEFIFO_H */