s390/zcrypt: Add support for CEX4 crypto card

New zcrypt module supports IBM CryptoExpress 4 cards.

Signed-off-by: Holger Dengler <hd@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 149 insertions, 0 deletions

diff --git a/drivers/s390/crypto/zcrypt_cex4.c b/drivers/s390/crypto/zcrypt_cex4.c
new file mode 100644
index 000000000000..ce1226398ac9
--- /dev/null
+++ b/drivers/s390/crypto/zcrypt_cex4.c
@@ -0,0 +1,149 @@
+/*
+ *  Copyright IBM Corp. 2012
+ *  Author(s): Holger Dengler <hd@linux.vnet.ibm.com>
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/atomic.h>
+#include <linux/uaccess.h>
+
+#include "ap_bus.h"
+#include "zcrypt_api.h"
+#include "zcrypt_msgtype6.h"
+#include "zcrypt_msgtype50.h"
+#include "zcrypt_error.h"
+#include "zcrypt_cex4.h"
+
+#define CEX4A_MIN_MOD_SIZE        1     /*    8 bits    */
+#define CEX4A_MAX_MOD_SIZE_2K   256     /* 2048 bits    */
+#define CEX4A_MAX_MOD_SIZE_4K   512     /* 4096 bits    */
+
+#define CEX4C_MIN_MOD_SIZE       16     /*  256 bits    */
+#define CEX4C_MAX_MOD_SIZE      512     /* 4096 bits    */
+
+#define CEX4A_SPEED_RATING      900      /* TODO new card, new speed rating */
+#define CEX4C_SPEED_RATING      6500     /* TODO new card, new speed rating */
+
+#define CEX4A_MAX_MESSAGE_SIZE  MSGTYPE50_CRB3_MAX_MSG_SIZE
+#define CEX4C_MAX_MESSAGE_SIZE  MSGTYPE06_MAX_MSG_SIZE
+
+#define CEX4_CLEANUP_TIME       (15*HZ)
+
+static struct ap_device_id zcrypt_cex4_ids[] = {
+        { AP_DEVICE(AP_DEVICE_TYPE_CEX4)  },
+        { /* end of list */ },
+};
+
+MODULE_DEVICE_TABLE(ap, zcrypt_cex4_ids);
+MODULE_AUTHOR("IBM Corporation");
+MODULE_DESCRIPTION("CEX4 Cryptographic Card device driver, " \
+                   "Copyright IBM Corp. 2012");
+MODULE_LICENSE("GPL");
+
+static int zcrypt_cex4_probe(struct ap_device *ap_dev);
+static void zcrypt_cex4_remove(struct ap_device *ap_dev);
+
+static struct ap_driver zcrypt_cex4_driver = {
+        .probe = zcrypt_cex4_probe,
+        .remove = zcrypt_cex4_remove,
+        .ids = zcrypt_cex4_ids,
+        .request_timeout = CEX4_CLEANUP_TIME,
+};
+
+/**
+ * Probe function for CEX4 cards. It always accepts the AP device
+ * since the bus_match already checked the hardware type.
+ * @ap_dev: pointer to the AP device.
+ */
+static int zcrypt_cex4_probe(struct ap_device *ap_dev)
+{
+        struct zcrypt_device *zdev = NULL;
+        int rc = 0;
+
+        switch (ap_dev->device_type) {
+        case AP_DEVICE_TYPE_CEX4:
+                if (ap_test_bit(&ap_dev->functions, AP_FUNC_ACCEL)) {
+                        zdev = zcrypt_device_alloc(CEX4A_MAX_MESSAGE_SIZE);
+                        if (!zdev)
+                                return -ENOMEM;
+                        zdev->type_string = "CEX4A";
+                        zdev->user_space_type = ZCRYPT_CEX3A;
+                        zdev->min_mod_size = CEX4A_MIN_MOD_SIZE;
+                        if (ap_test_bit(&ap_dev->functions, AP_FUNC_MEX4K) &&
+                            ap_test_bit(&ap_dev->functions, AP_FUNC_CRT4K)) {
+                                zdev->max_mod_size =
+                                        CEX4A_MAX_MOD_SIZE_4K;
+                                zdev->max_exp_bit_length =
+                                        CEX4A_MAX_MOD_SIZE_4K;
+                        } else {
+                                zdev->max_mod_size =
+                                        CEX4A_MAX_MOD_SIZE_2K;
+                                zdev->max_exp_bit_length =
+                                        CEX4A_MAX_MOD_SIZE_2K;
+                        }
+                        zdev->short_crt = 1;
+                        zdev->speed_rating = CEX4A_SPEED_RATING;
+                        zdev->ops = zcrypt_msgtype_request(MSGTYPE50_NAME,
+                                                           MSGTYPE50_VARIANT_DEFAULT);
+                } else if (ap_test_bit(&ap_dev->functions, AP_FUNC_COPRO)) {
+                        zdev = zcrypt_device_alloc(CEX4C_MAX_MESSAGE_SIZE);
+                        if (!zdev)
+                                return -ENOMEM;
+                        zdev->type_string = "CEX4C";
+                        zdev->user_space_type = ZCRYPT_CEX3C;
+                        zdev->min_mod_size = CEX4C_MIN_MOD_SIZE;
+                        zdev->max_mod_size = CEX4C_MAX_MOD_SIZE;
+                        zdev->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
+                        zdev->short_crt = 0;
+                        zdev->speed_rating = CEX4C_SPEED_RATING;
+                        zdev->ops = zcrypt_msgtype_request(MSGTYPE06_NAME,
+                                                           MSGTYPE06_VARIANT_DEFAULT);
+                }
+                break;
+        }
+        if (!zdev)
+                return -ENODEV;
+        zdev->ap_dev = ap_dev;
+        zdev->online = 1;
+        ap_dev->reply = &zdev->reply;
+        ap_dev->private = zdev;
+        rc = zcrypt_device_register(zdev);
+        if (rc) {
+                zcrypt_msgtype_release(zdev->ops);
+                ap_dev->private = NULL;
+                zcrypt_device_free(zdev);
+        }
+        return rc;
+}
+
+/**
+ * This is called to remove the extended CEX4 driver information
+ * if an AP device is removed.
+ */
+static void zcrypt_cex4_remove(struct ap_device *ap_dev)
+{
+        struct zcrypt_device *zdev = ap_dev->private;
+        struct zcrypt_ops *zops;
+
+        if (zdev) {
+                zops = zdev->ops;
+                zcrypt_device_unregister(zdev);
+                zcrypt_msgtype_release(zops);
+        }
+}
+
+int __init zcrypt_cex4_init(void)
+{
+        return ap_driver_register(&zcrypt_cex4_driver, THIS_MODULE, "cex4");
+}
+
+void __exit zcrypt_cex4_exit(void)
+{
+        ap_driver_unregister(&zcrypt_cex4_driver);
+}
+
+module_init(zcrypt_cex4_init);
+module_exit(zcrypt_cex4_exit);