From: Christopher Bostic <cbostic@linux.vnet.ibm.com>
To: robh+dt@kernel.org, mark.rutland@arm.com, linux@armlinux.org.uk,
rostedt@goodmis.org, mingo@redhat.com,
gregkh@linuxfoundation.org, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Cc: Chris Bostic <cbostic@linux.vnet.ibm.com>,
joel@jms.id.au, linux-kernel@vger.kernel.org, andrew@aj.id.au,
alistair@popple.id.au, benh@kernel.crashing.org
Subject: [PATCH v4 06/23] drivers/fsi: Set up links for slave communication
Date: Wed, 29 Mar 2017 12:43:23 -0500 [thread overview]
Message-ID: <20170329174340.89109-7-cbostic@linux.vnet.ibm.com> (raw)
In-Reply-To: <20170329174340.89109-1-cbostic@linux.vnet.ibm.com>
From: Chris Bostic <cbostic@linux.vnet.ibm.com>
Enable each link and send a break command, and try to detect a slave by
reading from the SMODE register.
Signed-off-by: Chris Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
---
drivers/fsi/fsi-core.c | 37 +++++++++++++++++++++++++++++++++++--
1 file changed, 35 insertions(+), 2 deletions(-)
diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index 32698ed..6e1cfdf 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -157,12 +157,45 @@ static int fsi_master_write(struct fsi_master *master, int link,
return master->write(master, link, slave_id, addr, val, size);
}
+static int fsi_master_link_enable(struct fsi_master *master, int link)
+{
+ if (master->link_enable)
+ return master->link_enable(master, link);
+
+ return 0;
+}
+
+/*
+ * Issue a break command on this link
+ */
+static int fsi_master_break(struct fsi_master *master, int link)
+{
+ if (master->send_break)
+ return master->send_break(master, link);
+
+ return 0;
+}
+
static int fsi_master_scan(struct fsi_master *master)
{
- int link;
+ int link, rc;
+
+ for (link = 0; link < master->n_links; link++) {
+ rc = fsi_master_link_enable(master, link);
+ if (rc) {
+ dev_dbg(&master->dev,
+ "enable link %d failed: %d\n", link, rc);
+ continue;
+ }
+ rc = fsi_master_break(master, link);
+ if (rc) {
+ dev_dbg(&master->dev,
+ "break to link %d failed: %d\n", link, rc);
+ continue;
+ }
- for (link = 0; link < master->n_links; link++)
fsi_slave_init(master, link, 0);
+ }
return 0;
}
--
1.8.2.2
next prev parent reply other threads:[~2017-03-29 17:44 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-29 17:43 [PATCH v4 00/23] FSI device driver implementation Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 01/23] drivers/fsi: Add fsi master definition Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 02/23] drivers/fsi: Add slave definition Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 03/23] drivers/fsi: Add empty master scan Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 04/23] drivers/fsi: Add crc4 helpers Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 05/23] drivers/fsi: Add slave & master read/write APIs Christopher Bostic
2017-03-29 17:43 ` Christopher Bostic [this message]
2017-03-29 17:43 ` [PATCH v4 07/23] drivers/fsi: Implement slave initialisation Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 08/23] drivers/fsi: Set slave SMODE to init communication Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 09/23] drivers/fsi: scan slaves & register devices Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 10/23] drivers/fsi: Add device read/write/peek API Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 11/23] drivers/fsi: Add master unscan Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 12/23] drivers/fsi: Add documentation for GPIO bindings Christopher Bostic
2017-04-03 15:24 ` Rob Herring
2017-03-29 17:43 ` [PATCH v4 13/23] drivers/fsi: Add client driver register utilities Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 14/23] drivers/fsi: Add sysfs files for FSI master & slave accesses Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 15/23] drivers/fsi: expose direct-access slave API Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 16/23] drivers/fsi: Add tracepoints for low-level operations Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 17/23] drivers/fsi: Add error handling for slave communication errors Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 18/23] drivers/fsi: Document FSI master sysfs files in ABI Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 19/23] drivers/fsi: Add GPIO based FSI master Christopher Bostic
2017-03-30 5:48 ` Joel Stanley
2017-03-30 18:15 ` Christopher Bostic
2017-03-30 20:50 ` Benjamin Herrenschmidt
2017-04-04 17:32 ` Christopher Bostic
2017-04-04 22:19 ` Benjamin Herrenschmidt
2017-04-05 1:24 ` Christopher Bostic
2017-04-09 21:22 ` Christopher Bostic
2017-04-09 21:41 ` Benjamin Herrenschmidt
2017-04-09 21:53 ` Benjamin Herrenschmidt
2017-04-09 21:55 ` Benjamin Herrenschmidt
2017-03-30 22:57 ` Joel Stanley
2017-03-29 17:43 ` [PATCH v4 20/23] drivers/fsi/gpio: Add tracepoints for GPIO master Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 21/23] drivers/fsi: Add SCOM FSI client device driver Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 22/23] drivers/fsi: Add hub master support Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 23/23] drivers/fsi: Use asynchronous slave mode Christopher Bostic
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