From: Chris Bostic <christopher.lee.bostic@gmail.com>
To: robh+dt@kernel.org, mark.rutland@arm.com, linux@armlinux.org.uk,
gregkh@linuxfoundation.org, sre@kernel.org,
mturquette@baylibre.com, geert+renesas@glider.be,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Cc: Jeremy Kerr <jk@ozlabs.org>,
joel@jms.id.au, linux-kernel@vger.kernel.org, andrew@aj.id.au,
alistair@popple.id.au, benh@kernel.crashing.org,
Chris Bostic <cbostic@us.ibm.com>
Subject: [PATCH 05/16] drivers/fsi: Add fake master driver
Date: Tue, 6 Dec 2016 18:14:26 -0600 [thread overview]
Message-ID: <1481069677-53660-6-git-send-email-christopher.lee.bostic@gmail.com> (raw)
In-Reply-To: <1481069677-53660-1-git-send-email-christopher.lee.bostic@gmail.com>
From: Jeremy Kerr <jk@ozlabs.org>
For debugging, add a fake master driver, that only supports reads,
returning a fixed set of data.
Includes changes from Chris Bostic <cbostic@us.ibm.com>.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Chris Bostic <cbostic@us.ibm.com>
---
drivers/fsi/Kconfig | 10 +++++
drivers/fsi/Makefile | 1 +
drivers/fsi/fsi-master-fake.c | 95 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 106 insertions(+)
create mode 100644 drivers/fsi/fsi-master-fake.c
diff --git a/drivers/fsi/Kconfig b/drivers/fsi/Kconfig
index 04c1a0e..f065dbe 100644
--- a/drivers/fsi/Kconfig
+++ b/drivers/fsi/Kconfig
@@ -9,4 +9,14 @@ config FSI
---help---
FSI - the FRU Support Interface - is a simple bus for low-level
access to POWER-based hardware.
+
+if FSI
+
+config FSI_MASTER_FAKE
+ tristate "Fake FSI master"
+ depends on FSI
+ ---help---
+ This option enables a fake FSI master driver for debugging.
+endif
+
endmenu
diff --git a/drivers/fsi/Makefile b/drivers/fsi/Makefile
index db0e5e7..847c00c 100644
--- a/drivers/fsi/Makefile
+++ b/drivers/fsi/Makefile
@@ -1,2 +1,3 @@
obj-$(CONFIG_FSI) += fsi-core.o
+obj-$(CONFIG_FSI_MASTER_FAKE) += fsi-master-fake.o
diff --git a/drivers/fsi/fsi-master-fake.c b/drivers/fsi/fsi-master-fake.c
new file mode 100644
index 0000000..b42fe5b
--- /dev/null
+++ b/drivers/fsi/fsi-master-fake.c
@@ -0,0 +1,95 @@
+/*
+ * Fake FSI master driver for FSI development
+ *
+ * Copyright (C) IBM Corporation 2016
+ *
+ * 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
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+
+#include "fsi-master.h"
+
+static const uint8_t data[] = {
+ 0xc0, 0x02, 0x08, 0x03, /* chip id */
+ 0x80, 0x01, 0x11, 0x00, /* peek */
+ 0x80, 0x01, 0x20, 0x3e, /* slave */
+ 0x00, 0x01, 0x10, 0xa5, /* i2c */
+};
+
+
+static int fsi_master_fake_read(struct fsi_master *_master, int link,
+ uint8_t slave, uint32_t addr, void *val, size_t size)
+{
+ if (link != 0)
+ return -ENODEV;
+
+ if (addr + size > sizeof(data))
+ memset(val, 0, size);
+ else
+ memcpy(val, data + addr, size);
+
+ return 0;
+}
+
+static int fsi_master_fake_write(struct fsi_master *_master, int link,
+ uint8_t slave, uint32_t addr, const void *val, size_t size)
+{
+ if (link != 0)
+ return -ENODEV;
+
+ return -EACCES;
+}
+
+static int fsi_master_fake_probe(struct platform_device *pdev)
+{
+ struct fsi_master *master;
+
+ master = devm_kzalloc(&pdev->dev, sizeof(*master), GFP_KERNEL);
+ if (!master)
+ return -ENOMEM;
+
+ master->dev = &pdev->dev;
+ master->n_links = 1;
+ master->read = fsi_master_fake_read;
+ master->write = fsi_master_fake_write;
+
+ return fsi_master_register(master);
+}
+
+static const struct of_device_id fsi_master_fake_match[] = {
+ { .compatible = "ibm,fsi-master-fake" },
+ { },
+};
+
+static struct platform_driver fsi_master_fake_driver = {
+ .driver = {
+ .name = "fsi-master-fake",
+ .of_match_table = fsi_master_fake_match,
+ },
+ .probe = fsi_master_fake_probe,
+};
+
+static int __init fsi_master_fake_init(void)
+{
+ struct device_node *np;
+
+ platform_driver_register(&fsi_master_fake_driver);
+
+ for_each_compatible_node(np, NULL, "ibm,fsi-master-fake")
+ of_platform_device_create(np, NULL, NULL);
+
+ return 0;
+}
+
+module_init(fsi_master_fake_init);
--
1.8.2.2
next prev parent reply other threads:[~2016-12-07 0:15 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-07 0:14 [PATCH 00/16] FSI device driver introduction Chris Bostic
2016-12-07 0:14 ` [PATCH 01/16] drivers/fsi: Add empty fsi bus definitions Chris Bostic
2016-12-07 0:14 ` [PATCH 02/16] drivers/fsi: Add device & driver definitions Chris Bostic
2016-12-07 0:14 ` [PATCH 03/16] drivers/fsi: add driver to device matches Chris Bostic
2016-12-07 0:14 ` Chris Bostic [this message]
2016-12-07 12:09 ` [PATCH 05/16] drivers/fsi: Add fake master driver Mark Rutland
2016-12-07 23:27 ` Jeremy Kerr
2016-12-07 0:14 ` [PATCH 06/16] drivers/fsi: Add slave definition Chris Bostic
2016-12-07 0:14 ` [PATCH 07/16] drivers/fsi: Add empty master scan Chris Bostic
2016-12-07 0:14 ` [PATCH 10/16] drivers/fsi: scan slaves & register devices Chris Bostic
2016-12-07 0:14 ` [PATCH 13/16] drivers/fsi: Set slave SMODE to init communication Chris Bostic
2016-12-07 0:14 ` [PATCH 14/16] drivers/fsi: Add master unscan Chris Bostic
2016-12-07 9:31 ` Greg KH
2016-12-07 0:14 ` [PATCH 15/16] drivers/fsi: Add documentation for GPIO bindings Chris Bostic
2016-12-07 12:02 ` Mark Rutland
2016-12-07 0:14 ` [PATCH 16/16] drivers/fsi: Add GPIO based FSI master Chris Bostic
2016-12-09 4:12 ` Jeremy Kerr
2016-12-12 19:49 ` Christopher Bostic
2016-12-07 1:52 ` [PATCH 00/16] FSI device driver introduction Sebastian Reichel
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