crypto: nx - add NX-842 platform frontend driver

Add NX-842 frontend that allows using either the pSeries platform or
PowerNV platform driver (to be added by later patch) for the NX-842
hardware.  Update the MAINTAINERS file to include the new filenames.
Update Kconfig files to clarify titles and descriptions, and correct
dependencies.

Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 27 insertions, 30 deletions

diff --git a/drivers/crypto/nx/nx-842-pseries.c b/drivers/crypto/nx/nx-842-pseries.c
index 887196e9b50c..9b83c9e7fd73 100644
--- a/drivers/crypto/nx/nx-842-pseries.c
+++ b/drivers/crypto/nx/nx-842-pseries.c
@@ -21,18 +21,13 @@
  *          Seth Jennings <sjenning@linux.vnet.ibm.com>
  */
 
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/nx842.h>
-#include <linux/of.h>
-#include <linux/slab.h>
-
 #include <asm/page.h>
 #include <asm/vio.h>
 
+#include "nx-842.h"
 #include "nx_csbcpb.h" /* struct nx_csbcpb */
 
-#define MODULE_NAME "nx-compress"
+#define MODULE_NAME NX842_PSERIES_MODULE_NAME
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Robert Jennings <rcj@linux.vnet.ibm.com>");
 MODULE_DESCRIPTION("842 H/W Compression driver for IBM Power processors");
@@ -236,18 +231,6 @@ struct nx842_workmem {
 	};
 };
 
-int nx842_get_workmem_size(void)
-{
-	return sizeof(struct nx842_workmem) + NX842_HW_PAGE_SIZE;
-}
-EXPORT_SYMBOL_GPL(nx842_get_workmem_size);
-
-int nx842_get_workmem_size_aligned(void)
-{
-	return sizeof(struct nx842_workmem);
-}
-EXPORT_SYMBOL_GPL(nx842_get_workmem_size_aligned);
-
 static int nx842_validate_result(struct device *dev,
 	struct cop_status_block *csb)
 {
@@ -300,7 +283,7 @@ static int nx842_validate_result(struct device *dev,
 }
 
 /**
- * nx842_compress - Compress data using the 842 algorithm
+ * nx842_pseries_compress - Compress data using the 842 algorithm
  *
  * Compression provide by the NX842 coprocessor on IBM Power systems.
  * The input buffer is compressed and the result is stored in the
@@ -315,7 +298,7 @@ static int nx842_validate_result(struct device *dev,
  * @out: Pointer to output buffer
  * @outlen: Length of output buffer
  * @wrkmem: ptr to buffer for working memory, size determined by
- *          nx842_get_workmem_size()
+ *          NX842_MEM_COMPRESS
  *
  * Returns:
  *   0		Success, output of length @outlen stored in the buffer at @out
@@ -325,8 +308,9 @@ static int nx842_validate_result(struct device *dev,
  *   -EIO	Internal error
  *   -ENODEV	Hardware unavailable
  */
-int nx842_compress(const unsigned char *in, unsigned int inlen,
-		       unsigned char *out, unsigned int *outlen, void *wmem)
+static int nx842_pseries_compress(const unsigned char *in, unsigned int inlen,
+				  unsigned char *out, unsigned int *outlen,
+				  void *wmem)
 {
 	struct nx842_header *hdr;
 	struct nx842_devdata *local_devdata;
@@ -493,13 +477,12 @@ unlock:
 	rcu_read_unlock();
 	return ret;
 }
-EXPORT_SYMBOL_GPL(nx842_compress);
 
 static int sw842_decompress(const unsigned char *, int, unsigned char *, int *,
 			const void *);
 
 /**
- * nx842_decompress - Decompress data using the 842 algorithm
+ * nx842_pseries_decompress - Decompress data using the 842 algorithm
  *
  * Decompression provide by the NX842 coprocessor on IBM Power systems.
  * The input buffer is decompressed and the result is stored in the
@@ -515,7 +498,7 @@ static int sw842_decompress(const unsigned char *, int, unsigned char *, int *,
  * @out: Pointer to output buffer, must be page aligned
  * @outlen: Length of output buffer, must be PAGE_SIZE
  * @wrkmem: ptr to buffer for working memory, size determined by
- *          nx842_get_workmem_size()
+ *          NX842_MEM_COMPRESS
  *
  * Returns:
  *   0		Success, output of length @outlen stored in the buffer at @out
@@ -525,8 +508,9 @@ static int sw842_decompress(const unsigned char *, int, unsigned char *, int *,
  *   -EINVAL	Bad input data encountered when attempting decompress
  *   -EIO	Internal error
  */
-int nx842_decompress(const unsigned char *in, unsigned int inlen,
-			 unsigned char *out, unsigned int *outlen, void *wmem)
+static int nx842_pseries_decompress(const unsigned char *in, unsigned int inlen,
+				    unsigned char *out, unsigned int *outlen,
+				    void *wmem)
 {
 	struct nx842_header *hdr;
 	struct nx842_devdata *local_devdata;
@@ -694,7 +678,6 @@ unlock:
 	rcu_read_unlock();
 	return ret;
 }
-EXPORT_SYMBOL_GPL(nx842_decompress);
 
 /**
  * nx842_OF_set_defaults -- Set default (disabled) values for devdata
@@ -1130,6 +1113,12 @@ static struct attribute_group nx842_attribute_group = {
 	.attrs = nx842_sysfs_entries,
 };
 
+static struct nx842_driver nx842_pseries_driver = {
+	.owner =	THIS_MODULE,
+	.compress =	nx842_pseries_compress,
+	.decompress =	nx842_pseries_decompress,
+};
+
 static int __init nx842_probe(struct vio_dev *viodev,
 				  const struct vio_device_id *id)
 {
@@ -1192,6 +1181,8 @@ static int __init nx842_probe(struct vio_dev *viodev,
 		goto error;
 	}
 
+	nx842_register_driver(&nx842_pseries_driver);
+
 	return 0;
 
 error_unlock:
@@ -1222,11 +1213,14 @@ static int __exit nx842_remove(struct vio_dev *viodev)
 	if (old_devdata)
 		kfree(old_devdata->counters);
 	kfree(old_devdata);
+
+	nx842_unregister_driver(&nx842_pseries_driver);
+
 	return 0;
 }
 
 static struct vio_device_id nx842_driver_ids[] = {
-	{"ibm,compression-v1", "ibm,compression"},
+	{NX842_PSERIES_COMPAT_NAME "-v1", NX842_PSERIES_COMPAT_NAME},
 	{"", ""},
 };
 
@@ -1243,6 +1237,8 @@ static int __init nx842_init(void)
 	struct nx842_devdata *new_devdata;
 	pr_info("Registering IBM Power 842 compression driver\n");
 
+	BUILD_BUG_ON(sizeof(struct nx842_workmem) > NX842_MEM_COMPRESS);
+
 	RCU_INIT_POINTER(devdata, NULL);
 	new_devdata = kzalloc(sizeof(*new_devdata), GFP_KERNEL);
 	if (!new_devdata) {
@@ -1272,6 +1268,7 @@ static void __exit nx842_exit(void)
 	if (old_devdata)
 		dev_set_drvdata(old_devdata->dev, NULL);
 	kfree(old_devdata);
+	nx842_unregister_driver(&nx842_pseries_driver);
 	vio_unregister_driver(&nx842_driver);
 }