crypto: caam - add support for SEC v5.x RNG4

The SEC v4.x' RNGB h/w block self-initialized.  RNG4, available
on SEC versions 5 and beyond, is based on a different standard
that requires manual initialization.

Also update any new errors From the SEC v5.2 reference manual:
The SEC v5.2's RNG4 unit reuses some error IDs, thus the addition
of rng_err_id_list over the CHA-independent err_id_list.

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

4 files changed, 196 insertions, 14 deletions

diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c
index 9a2db9c30630..ac6abb375c8d 100644
--- a/drivers/crypto/caam/ctrl.c
+++ b/drivers/crypto/caam/ctrl.c
@@ -2,13 +2,15 @@
  * CAAM control-plane driver backend
  * Controller-level driver, kernel property detection, initialization
  *
- * Copyright 2008-2011 Freescale Semiconductor, Inc.
+ * Copyright 2008-2012 Freescale Semiconductor, Inc.
  */
 
 #include "compat.h"
 #include "regs.h"
 #include "intern.h"
 #include "jr.h"
+#include "desc_constr.h"
+#include "error.h"
 
 static int caam_remove(struct platform_device *pdev)
 {
@@ -43,10 +45,120 @@ static int caam_remove(struct platform_device *pdev)
         return ret;
 }
 
+/*
+ * Descriptor to instantiate RNG State Handle 0 in normal mode and
+ * load the JDKEK, TDKEK and TDSK registers
+ */
+static void build_instantiation_desc(u32 *desc)
+{
+        u32 *jump_cmd;
+
+        init_job_desc(desc, 0);
+
+        /* INIT RNG in non-test mode */
+        append_operation(desc, OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG |
+                         OP_ALG_AS_INIT);
+
+        /* wait for done */
+        jump_cmd = append_jump(desc, JUMP_CLASS_CLASS1);
+        set_jump_tgt_here(desc, jump_cmd);
+
+        /*
+         * load 1 to clear written reg:
+         * resets the done interrrupt and returns the RNG to idle.
+         */
+        append_load_imm_u32(desc, 1, LDST_SRCDST_WORD_CLRW);
+
+        /* generate secure keys (non-test) */
+        append_operation(desc, OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG |
+                         OP_ALG_RNG4_SK);
+}
+
+struct instantiate_result {
+        struct completion completion;
+        int err;
+};
+
+static void rng4_init_done(struct device *dev, u32 *desc, u32 err,
+                           void *context)
+{
+        struct instantiate_result *instantiation = context;
+
+        if (err) {
+                char tmp[CAAM_ERROR_STR_MAX];
+
+                dev_err(dev, "%08x: %s\n", err, caam_jr_strstatus(tmp, err));
+        }
+
+        instantiation->err = err;
+        complete(&instantiation->completion);
+}
+
+static int instantiate_rng(struct device *jrdev)
+{
+        struct instantiate_result instantiation;
+
+        dma_addr_t desc_dma;
+        u32 *desc;
+        int ret;
+
+        desc = kmalloc(CAAM_CMD_SZ * 6, GFP_KERNEL | GFP_DMA);
+        if (!desc) {
+                dev_err(jrdev, "cannot allocate RNG init descriptor memory\n");
+                return -ENOMEM;
+        }
+
+        build_instantiation_desc(desc);
+        desc_dma = dma_map_single(jrdev, desc, desc_bytes(desc), DMA_TO_DEVICE);
+        init_completion(&instantiation.completion);
+        ret = caam_jr_enqueue(jrdev, desc, rng4_init_done, &instantiation);
+        if (!ret) {
+                wait_for_completion_interruptible(&instantiation.completion);
+                ret = instantiation.err;
+                if (ret)
+                        dev_err(jrdev, "unable to instantiate RNG\n");
+        }
+
+        dma_unmap_single(jrdev, desc_dma, desc_bytes(desc), DMA_TO_DEVICE);
+
+        kfree(desc);
+
+        return ret;
+}
+
+/*
+ * By default, the TRNG runs for 200 clocks per sample;
+ * 800 clocks per sample generates better entropy.
+ */
+static void kick_trng(struct platform_device *pdev)
+{
+        struct device *ctrldev = &pdev->dev;
+        struct caam_drv_private *ctrlpriv = dev_get_drvdata(ctrldev);
+        struct caam_full __iomem *topregs;
+        struct rng4tst __iomem *r4tst;
+        u32 val;
+
+        topregs = (struct caam_full __iomem *)ctrlpriv->ctrl;
+        r4tst = &topregs->ctrl.r4tst[0];
+
+        /* put RNG4 into program mode */
+        setbits32(&r4tst->rtmctl, RTMCTL_PRGM);
+        /* 800 clocks per sample */
+        val = rd_reg32(&r4tst->rtsdctl);
+        val = (val & ~RTSDCTL_ENT_DLY_MASK) | (800 << RTSDCTL_ENT_DLY_SHIFT);
+        wr_reg32(&r4tst->rtsdctl, val);
+        /* min. freq. count */
+        wr_reg32(&r4tst->rtfrqmin, 400);
+        /* max. freq. count */
+        wr_reg32(&r4tst->rtfrqmax, 6400);
+        /* put RNG4 into run mode */
+        clrbits32(&r4tst->rtmctl, RTMCTL_PRGM);
+}
+
 /* Probe routine for CAAM top (controller) level */
 static int caam_probe(struct platform_device *pdev)
 {
-        int ring, rspec;
+        int ret, ring, rspec;
         struct device *dev;
         struct device_node *nprop, *np;
         struct caam_ctrl __iomem *ctrl;
@@ -146,6 +258,19 @@ static int caam_probe(struct platform_device *pdev)
                 return -ENOMEM;
         }
 
+        /*
+         * RNG4 based SECs (v5+) need special initialization prior
+         * to executing any descriptors
+         */
+        if (of_device_is_compatible(nprop, "fsl,sec-v5.0")) {
+                kick_trng(pdev);
+                ret = instantiate_rng(ctrlpriv->jrdev[0]);
+                if (ret) {
+                        caam_remove(pdev);
+                        return ret;
+                }
+        }
+
         /* NOTE: RTIC detection ought to go here, around Si time */
 
         /* Initialize queue allocator lock */
diff --git a/drivers/crypto/caam/desc.h b/drivers/crypto/caam/desc.h
index 3e685062d44b..f7f833be8c67 100644
--- a/drivers/crypto/caam/desc.h
+++ b/drivers/crypto/caam/desc.h
@@ -1172,6 +1172,11 @@ struct sec4_sg_entry {
 #define OP_ALG_AAI_GSM          (0x10 << OP_ALG_AAI_SHIFT)
 #define OP_ALG_AAI_EDGE         (0x20 << OP_ALG_AAI_SHIFT)
 
+/* RNG4 set */
+#define OP_ALG_RNG4_SHIFT       4
+#define OP_ALG_RNG4_MASK        (0x1f3 << OP_ALG_RNG4_SHIFT)
+
+#define OP_ALG_RNG4_SK          (0x100 << OP_ALG_RNG4_SHIFT)
 
 #define OP_ALG_AS_SHIFT         2
 #define OP_ALG_AS_MASK          (0x3 << OP_ALG_AS_SHIFT)
diff --git a/drivers/crypto/caam/error.c b/drivers/crypto/caam/error.c
index 7e2d54bffad6..9955ed9643e6 100644
--- a/drivers/crypto/caam/error.c
+++ b/drivers/crypto/caam/error.c
@@ -39,18 +39,20 @@ static void report_ccb_status(u32 status, char *outstr)
         char *cha_id_list[] = {
                 "",
                 "AES",
-                "DES, 3DES",
+                "DES",
                 "ARC4",
-                "MD5, SHA-1, SH-224, SHA-256, SHA-384, SHA-512",
+                "MDHA",
                 "RNG",
                 "SNOW f8",
-                "Kasumi f8, f9",
-                "All Public Key Algorithms",
-                "CRC",
+                "Kasumi f8/9",
+                "PKHA",
+                "CRCA",
                 "SNOW f9",
+                "ZUCE",
+                "ZUCA",
         };
         char *err_id_list[] = {
-                "None. No error.",
+                "No error.",
                 "Mode error.",
                 "Data size error.",
                 "Key size error.",
@@ -67,6 +69,20 @@ static void report_ccb_status(u32 status, char *outstr)
                 "Invalid CHA combination was selected",
                 "Invalid CHA selected.",
         };
+        char *rng_err_id_list[] = {
+                "",
+                "",
+                "",
+                "Instantiate",
+                "Not instantiated",
+                "Test instantiate",
+                "Prediction resistance",
+                "",
+                "Prediction resistance and test request",
+                "Uninstantiate",
+                "",
+                "Secure key generation",
+        };
         u8 cha_id = (status & JRSTA_CCBERR_CHAID_MASK) >>
                     JRSTA_CCBERR_CHAID_SHIFT;
         u8 err_id = status & JRSTA_CCBERR_ERRID_MASK;
@@ -81,7 +97,13 @@ static void report_ccb_status(u32 status, char *outstr)
                            cha_id, sizeof("ff"));
         }
 
-        if (err_id < ARRAY_SIZE(err_id_list)) {
+        if ((cha_id << JRSTA_CCBERR_CHAID_SHIFT) == JRSTA_CCBERR_CHAID_RNG &&
+            err_id < ARRAY_SIZE(rng_err_id_list) &&
+            strlen(rng_err_id_list[err_id])) {
+                /* RNG-only error */
+                SPRINTFCAT(outstr, "%s", rng_err_id_list[err_id],
+                           strlen(rng_err_id_list[err_id]));
+        } else if (err_id < ARRAY_SIZE(err_id_list)) {
                 SPRINTFCAT(outstr, "%s", err_id_list[err_id],
                            strlen(err_id_list[err_id]));
         } else {
@@ -101,10 +123,10 @@ static void report_deco_status(u32 status, char *outstr)
                 u8 value;
                 char *error_text;
         } desc_error_list[] = {
-                { 0x00, "None. No error." },
+                { 0x00, "No error." },
                 { 0x01, "SGT Length Error. The descriptor is trying to read "
                         "more data than is contained in the SGT table." },
-                { 0x02, "Reserved." },
+                { 0x02, "SGT Null Entry Error." },
                 { 0x03, "Job Ring Control Error. There is a bad value in the "
                         "Job Ring Control register." },
                 { 0x04, "Invalid Descriptor Command. The Descriptor Command "
@@ -116,7 +138,7 @@ static void report_deco_status(u32 status, char *outstr)
                 { 0x09, "Invalid OPERATION Command" },
                 { 0x0A, "Invalid FIFO LOAD Command" },
                 { 0x0B, "Invalid FIFO STORE Command" },
-                { 0x0C, "Invalid MOVE Command" },
+                { 0x0C, "Invalid MOVE/MOVE_LEN Command" },
                 { 0x0D, "Invalid JUMP Command. A nonlocal JUMP Command is "
                         "invalid because the target is not a Job Header "
                         "Command, or the jump is from a Trusted Descriptor to "
@@ -166,6 +188,8 @@ static void report_deco_status(u32 status, char *outstr)
                         "(input frame; block ciphers) and IPsec decap (output "
                         "frame, when doing the next header byte update) and "
                         "DCRC (output frame)." },
+                { 0x23, "Read Input Frame error" },
+                { 0x24, "JDKEK, TDKEK or TDSK not loaded error" },
                 { 0x80, "DNR (do not run) error" },
                 { 0x81, "undefined protocol command" },
                 { 0x82, "invalid setting in PDB" },
diff --git a/drivers/crypto/caam/regs.h b/drivers/crypto/caam/regs.h
index e9f7a70cdd5e..6d9f1d982970 100644
--- a/drivers/crypto/caam/regs.h
+++ b/drivers/crypto/caam/regs.h
@@ -167,7 +167,7 @@ struct partid {
         u32 pidr;       /* partition ID, DECO */
 };
 
-/* RNG test mode (replicated twice in some configurations) */
+/* RNGB test mode (replicated twice in some configurations) */
 /* Padded out to 0x100 */
 struct rngtst {
         u32 mode;               /* RTSTMODEx - Test mode */
@@ -200,6 +200,31 @@ struct rngtst {
         u32 rsvd14[15];
 };
 
+/* RNG4 TRNG test registers */
+struct rng4tst {
+#define RTMCTL_PRGM 0x00010000  /* 1 -> program mode, 0 -> run mode */
+        u32 rtmctl;             /* misc. control register */
+        u32 rtscmisc;           /* statistical check misc. register */
+        u32 rtpkrrng;           /* poker range register */
+        union {
+                u32 rtpkrmax;   /* PRGM=1: poker max. limit register */
+                u32 rtpkrsq;    /* PRGM=0: poker square calc. result register */
+        };
+#define RTSDCTL_ENT_DLY_SHIFT 16
+#define RTSDCTL_ENT_DLY_MASK (0xffff << RTSDCTL_ENT_DLY_SHIFT)
+        u32 rtsdctl;            /* seed control register */
+        union {
+                u32 rtsblim;    /* PRGM=1: sparse bit limit register */
+                u32 rttotsam;   /* PRGM=0: total samples register */
+        };
+        u32 rtfrqmin;           /* frequency count min. limit register */
+        union {
+                u32 rtfrqmax;   /* PRGM=1: freq. count max. limit register */
+                u32 rtfrqcnt;   /* PRGM=0: freq. count register */
+        };
+        u32 rsvd1[56];
+};
+
 /*
  * caam_ctrl - basic core configuration
  * starts base + 0x0000 padded out to 0x1000
@@ -249,7 +274,10 @@ struct caam_ctrl {
 
         /* RNG Test/Verification/Debug Access                   600-7ff */
         /* (Useful in Test/Debug modes only...)                         */
-        struct rngtst rtst[2];
+        union {
+                struct rngtst rtst[2];
+                struct rng4tst r4tst[2];
+        };
 
         u32 rsvd9[448];