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path: root/drivers/crypto/caam/ctrl.c
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Diffstat (limited to 'drivers/crypto/caam/ctrl.c')
-rw-r--r--drivers/crypto/caam/ctrl.c179
1 files changed, 173 insertions, 6 deletions
diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c
index 77557ebcd337..414ba20c05a1 100644
--- a/drivers/crypto/caam/ctrl.c
+++ b/drivers/crypto/caam/ctrl.c
@@ -2,13 +2,16 @@
* 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"
+#include "ctrl.h"
static int caam_remove(struct platform_device *pdev)
{
@@ -43,10 +46,154 @@ 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);
+}
+
+/**
+ * caam_get_era() - Return the ERA of the SEC on SoC, based
+ * on the SEC_VID register.
+ * Returns the ERA number (1..4) or -ENOTSUPP if the ERA is unknown.
+ * @caam_id - the value of the SEC_VID register
+ **/
+int caam_get_era(u64 caam_id)
+{
+ struct sec_vid *sec_vid = (struct sec_vid *)&caam_id;
+ static const struct {
+ u16 ip_id;
+ u8 maj_rev;
+ u8 era;
+ } caam_eras[] = {
+ {0x0A10, 1, 1},
+ {0x0A10, 2, 2},
+ {0x0A12, 1, 3},
+ {0x0A14, 1, 3},
+ {0x0A14, 2, 4},
+ {0x0A16, 1, 4},
+ {0x0A11, 1, 4}
+ };
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(caam_eras); i++)
+ if (caam_eras[i].ip_id == sec_vid->ip_id &&
+ caam_eras[i].maj_rev == sec_vid->maj_rev)
+ return caam_eras[i].era;
+
+ return -ENOTSUPP;
+}
+EXPORT_SYMBOL(caam_get_era);
+
/* Probe routine for CAAM top (controller) level */
static int caam_probe(struct platform_device *pdev)
{
- int ring, rspec;
+ int ret, ring, rspec;
+ u64 caam_id;
struct device *dev;
struct device_node *nprop, *np;
struct caam_ctrl __iomem *ctrl;
@@ -82,13 +229,18 @@ static int caam_probe(struct platform_device *pdev)
/*
* Enable DECO watchdogs and, if this is a PHYS_ADDR_T_64BIT kernel,
- * 36-bit pointers in master configuration register
+ * long pointers in master configuration register
*/
setbits32(&topregs->ctrl.mcr, MCFGR_WDENABLE |
(sizeof(dma_addr_t) == sizeof(u64) ? MCFGR_LONG_PTR : 0));
if (sizeof(dma_addr_t) == sizeof(u64))
- dma_set_mask(dev, DMA_BIT_MASK(36));
+ if (of_device_is_compatible(nprop, "fsl,sec-v5.0"))
+ dma_set_mask(dev, DMA_BIT_MASK(40));
+ else
+ dma_set_mask(dev, DMA_BIT_MASK(36));
+ else
+ dma_set_mask(dev, DMA_BIT_MASK(32));
/*
* Detect and enable JobRs
@@ -141,14 +293,29 @@ 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 */
spin_lock_init(&ctrlpriv->jr_alloc_lock);
+ caam_id = rd_reg64(&topregs->ctrl.perfmon.caam_id);
+
/* Report "alive" for developer to see */
- dev_info(dev, "device ID = 0x%016llx\n",
- rd_reg64(&topregs->ctrl.perfmon.caam_id));
+ dev_info(dev, "device ID = 0x%016llx (Era %d)\n", caam_id,
+ caam_get_era(caam_id));
dev_info(dev, "job rings = %d, qi = %d\n",
ctrlpriv->total_jobrs, ctrlpriv->qi_present);