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authorMatt Porter <mporter@kernel.crashing.org>2005-11-07 01:00:15 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-07 07:53:46 -0800
commit394b701ce4fbfde919a9bcbf84cb4820a7c6d47c (patch)
treea397fff4043a9810e753fb81224349bd36db45b8 /drivers/rapidio/rio-access.c
parentd217d5450f11d8c907c0458d175b0dc999b4d06d (diff)
[PATCH] RapidIO support: core base
Adds a RapidIO subsystem to the kernel. RIO is a switched fabric interconnect used in higher-end embedded applications. The curious can look at the specs over at http://www.rapidio.org The core code implements enumeration/discovery, management of devices/resources, and interfaces for RIO drivers. There's a lot more to do to take advantages of all the hardware features. However, this should provide a good base for folks with RIO hardware to start contributing. Signed-off-by: Matt Porter <mporter@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/rapidio/rio-access.c')
-rw-r--r--drivers/rapidio/rio-access.c175
1 files changed, 175 insertions, 0 deletions
diff --git a/drivers/rapidio/rio-access.c b/drivers/rapidio/rio-access.c
new file mode 100644
index 000000000000..b9fab2ae3a36
--- /dev/null
+++ b/drivers/rapidio/rio-access.c
@@ -0,0 +1,175 @@
+/*
+ * RapidIO configuration space access support
+ *
+ * Copyright 2005 MontaVista Software, Inc.
+ * Matt Porter <mporter@kernel.crashing.org>
+ *
+ * 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 <linux/rio.h>
+#include <linux/module.h>
+
+/*
+ * These interrupt-safe spinlocks protect all accesses to RIO
+ * configuration space and doorbell access.
+ */
+static spinlock_t rio_config_lock = SPIN_LOCK_UNLOCKED;
+static spinlock_t rio_doorbell_lock = SPIN_LOCK_UNLOCKED;
+
+/*
+ * Wrappers for all RIO configuration access functions. They just check
+ * alignment, do locking and call the low-level functions pointed to
+ * by rio_mport->ops.
+ */
+
+#define RIO_8_BAD 0
+#define RIO_16_BAD (offset & 1)
+#define RIO_32_BAD (offset & 3)
+
+/**
+ * RIO_LOP_READ - Generate rio_local_read_config_* functions
+ * @size: Size of configuration space read (8, 16, 32 bits)
+ * @type: C type of value argument
+ * @len: Length of configuration space read (1, 2, 4 bytes)
+ *
+ * Generates rio_local_read_config_* functions used to access
+ * configuration space registers on the local device.
+ */
+#define RIO_LOP_READ(size,type,len) \
+int __rio_local_read_config_##size \
+ (struct rio_mport *mport, u32 offset, type *value) \
+{ \
+ int res; \
+ unsigned long flags; \
+ u32 data = 0; \
+ if (RIO_##size##_BAD) return RIO_BAD_SIZE; \
+ spin_lock_irqsave(&rio_config_lock, flags); \
+ res = mport->ops->lcread(mport->id, offset, len, &data); \
+ *value = (type)data; \
+ spin_unlock_irqrestore(&rio_config_lock, flags); \
+ return res; \
+}
+
+/**
+ * RIO_LOP_WRITE - Generate rio_local_write_config_* functions
+ * @size: Size of configuration space write (8, 16, 32 bits)
+ * @type: C type of value argument
+ * @len: Length of configuration space write (1, 2, 4 bytes)
+ *
+ * Generates rio_local_write_config_* functions used to access
+ * configuration space registers on the local device.
+ */
+#define RIO_LOP_WRITE(size,type,len) \
+int __rio_local_write_config_##size \
+ (struct rio_mport *mport, u32 offset, type value) \
+{ \
+ int res; \
+ unsigned long flags; \
+ if (RIO_##size##_BAD) return RIO_BAD_SIZE; \
+ spin_lock_irqsave(&rio_config_lock, flags); \
+ res = mport->ops->lcwrite(mport->id, offset, len, value); \
+ spin_unlock_irqrestore(&rio_config_lock, flags); \
+ return res; \
+}
+
+RIO_LOP_READ(8, u8, 1)
+RIO_LOP_READ(16, u16, 2)
+RIO_LOP_READ(32, u32, 4)
+RIO_LOP_WRITE(8, u8, 1)
+RIO_LOP_WRITE(16, u16, 2)
+RIO_LOP_WRITE(32, u32, 4)
+
+EXPORT_SYMBOL_GPL(__rio_local_read_config_8);
+EXPORT_SYMBOL_GPL(__rio_local_read_config_16);
+EXPORT_SYMBOL_GPL(__rio_local_read_config_32);
+EXPORT_SYMBOL_GPL(__rio_local_write_config_8);
+EXPORT_SYMBOL_GPL(__rio_local_write_config_16);
+EXPORT_SYMBOL_GPL(__rio_local_write_config_32);
+
+/**
+ * RIO_OP_READ - Generate rio_mport_read_config_* functions
+ * @size: Size of configuration space read (8, 16, 32 bits)
+ * @type: C type of value argument
+ * @len: Length of configuration space read (1, 2, 4 bytes)
+ *
+ * Generates rio_mport_read_config_* functions used to access
+ * configuration space registers on the local device.
+ */
+#define RIO_OP_READ(size,type,len) \
+int rio_mport_read_config_##size \
+ (struct rio_mport *mport, u16 destid, u8 hopcount, u32 offset, type *value) \
+{ \
+ int res; \
+ unsigned long flags; \
+ u32 data = 0; \
+ if (RIO_##size##_BAD) return RIO_BAD_SIZE; \
+ spin_lock_irqsave(&rio_config_lock, flags); \
+ res = mport->ops->cread(mport->id, destid, hopcount, offset, len, &data); \
+ *value = (type)data; \
+ spin_unlock_irqrestore(&rio_config_lock, flags); \
+ return res; \
+}
+
+/**
+ * RIO_OP_WRITE - Generate rio_mport_write_config_* functions
+ * @size: Size of configuration space write (8, 16, 32 bits)
+ * @type: C type of value argument
+ * @len: Length of configuration space write (1, 2, 4 bytes)
+ *
+ * Generates rio_mport_write_config_* functions used to access
+ * configuration space registers on the local device.
+ */
+#define RIO_OP_WRITE(size,type,len) \
+int rio_mport_write_config_##size \
+ (struct rio_mport *mport, u16 destid, u8 hopcount, u32 offset, type value) \
+{ \
+ int res; \
+ unsigned long flags; \
+ if (RIO_##size##_BAD) return RIO_BAD_SIZE; \
+ spin_lock_irqsave(&rio_config_lock, flags); \
+ res = mport->ops->cwrite(mport->id, destid, hopcount, offset, len, value); \
+ spin_unlock_irqrestore(&rio_config_lock, flags); \
+ return res; \
+}
+
+RIO_OP_READ(8, u8, 1)
+RIO_OP_READ(16, u16, 2)
+RIO_OP_READ(32, u32, 4)
+RIO_OP_WRITE(8, u8, 1)
+RIO_OP_WRITE(16, u16, 2)
+RIO_OP_WRITE(32, u32, 4)
+
+EXPORT_SYMBOL_GPL(rio_mport_read_config_8);
+EXPORT_SYMBOL_GPL(rio_mport_read_config_16);
+EXPORT_SYMBOL_GPL(rio_mport_read_config_32);
+EXPORT_SYMBOL_GPL(rio_mport_write_config_8);
+EXPORT_SYMBOL_GPL(rio_mport_write_config_16);
+EXPORT_SYMBOL_GPL(rio_mport_write_config_32);
+
+/**
+ * rio_mport_send_doorbell - Send a doorbell message
+ *
+ * @mport: RIO master port
+ * @destid: RIO device destination ID
+ * @data: Doorbell message data
+ *
+ * Send a doorbell message to a RIO device. The doorbell message
+ * has a 16-bit info field provided by the data argument.
+ */
+int rio_mport_send_doorbell(struct rio_mport *mport, u16 destid, u16 data)
+{
+ int res;
+ unsigned long flags;
+
+ spin_lock_irqsave(&rio_doorbell_lock, flags);
+ res = mport->ops->dsend(mport->id, destid, data);
+ spin_unlock_irqrestore(&rio_doorbell_lock, flags);
+
+ return res;
+}
+
+EXPORT_SYMBOL_GPL(rio_mport_send_doorbell);