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Subject[PATCH v6 10/23] drivers/fsi: Add device read/write/peek API
Date
From: Jeremy Kerr <jk@ozlabs.org>

This change introduces the fsi device API: simple read, write and peek
accessors for the devices' address spaces.

Includes contributions from Chris Bostic <cbostic@linux.vnet.ibm.com>
and Edward A. James <eajames@us.ibm.com>.

Signed-off-by: Edward A. James <eajames@us.ibm.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Chris Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
---
drivers/fsi/fsi-core.c | 33 +++++++++++++++++++++++++++++++++
include/linux/fsi.h | 7 ++++++-
2 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index a8faa89..4da0b030 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -32,6 +32,8 @@
#define FSI_SLAVE_CONF_CRC_MASK 0x0000000f
#define FSI_SLAVE_CONF_DATA_BITS 28

+#define FSI_PEEK_BASE 0x410
+
static const int engine_page_size = 0x400;

#define FSI_SLAVE_BASE 0x800
@@ -73,9 +75,40 @@ static int fsi_master_read(struct fsi_master *master, int link,
uint8_t slave_id, uint32_t addr, void *val, size_t size);
static int fsi_master_write(struct fsi_master *master, int link,
uint8_t slave_id, uint32_t addr, const void *val, size_t size);
+static int fsi_slave_read(struct fsi_slave *slave, uint32_t addr,
+ void *val, size_t size);
+static int fsi_slave_write(struct fsi_slave *slave, uint32_t addr,
+ const void *val, size_t size);

/* FSI endpoint-device support */

+int fsi_device_read(struct fsi_device *dev, uint32_t addr, void *val,
+ size_t size)
+{
+ if (addr > dev->size || size > dev->size || addr > dev->size - size)
+ return -EINVAL;
+
+ return fsi_slave_read(dev->slave, dev->addr + addr, val, size);
+}
+EXPORT_SYMBOL_GPL(fsi_device_read);
+
+int fsi_device_write(struct fsi_device *dev, uint32_t addr, const void *val,
+ size_t size)
+{
+ if (addr > dev->size || size > dev->size || addr > dev->size - size)
+ return -EINVAL;
+
+ return fsi_slave_write(dev->slave, dev->addr + addr, val, size);
+}
+EXPORT_SYMBOL_GPL(fsi_device_write);
+
+int fsi_device_peek(struct fsi_device *dev, void *val)
+{
+ uint32_t addr = FSI_PEEK_BASE + ((dev->unit - 2) * sizeof(uint32_t));
+
+ return fsi_slave_read(dev->slave, addr, val, sizeof(uint32_t));
+}
+
static void fsi_device_release(struct device *_device)
{
struct fsi_device *device = to_fsi_dev(_device);
diff --git a/include/linux/fsi.h b/include/linux/fsi.h
index efa55ba..66bce48 100644
--- a/include/linux/fsi.h
+++ b/include/linux/fsi.h
@@ -27,6 +27,12 @@ struct fsi_device {
uint32_t size;
};

+extern int fsi_device_read(struct fsi_device *dev, uint32_t addr,
+ void *val, size_t size);
+extern int fsi_device_write(struct fsi_device *dev, uint32_t addr,
+ const void *val, size_t size);
+extern int fsi_device_peek(struct fsi_device *dev, void *val);
+
struct fsi_device_id {
u8 engine_type;
u8 version;
@@ -40,7 +46,6 @@ struct fsi_device_id {
#define FSI_DEVICE_VERSIONED(t, v) \
.engine_type = (t), .version = (v),

-
struct fsi_driver {
struct device_driver drv;
const struct fsi_device_id *id_table;
--
1.8.2.2
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