1 files changed, 523 insertions, 0 deletions

diff --git a/drivers/crypto/caam/jr.c b/drivers/crypto/caam/jr.c
new file mode 100644
index 000000000000..68cb9af4d1a3
--- /dev/null
+++ b/drivers/crypto/caam/jr.c
@@ -0,0 +1,523 @@
+/*
+ * CAAM/SEC 4.x transport/backend driver
+ * JobR backend functionality
+ *
+ * Copyright 2008-2011 Freescale Semiconductor, Inc.
+ */
+
+#include "compat.h"
+#include "regs.h"
+#include "jr.h"
+#include "desc.h"
+#include "intern.h"
+
+/* Main per-ring interrupt handler */
+static irqreturn_t caam_jr_interrupt(int irq, void *st_dev)
+{
+        struct device *dev = st_dev;
+        struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
+        u32 irqstate;
+
+        /*
+         * Check the output ring for ready responses, kick
+         * tasklet if jobs done.
+         */
+        irqstate = rd_reg32(&jrp->rregs->jrintstatus);
+        if (!irqstate)
+                return IRQ_NONE;
+
+        /*
+         * If JobR error, we got more development work to do
+         * Flag a bug now, but we really need to shut down and
+         * restart the queue (and fix code).
+         */
+        if (irqstate & JRINT_JR_ERROR) {
+                dev_err(dev, "job ring error: irqstate: %08x\n", irqstate);
+                BUG();
+        }
+
+        /* mask valid interrupts */
+        setbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK);
+
+        /* Have valid interrupt at this point, just ACK and trigger */
+        wr_reg32(&jrp->rregs->jrintstatus, irqstate);
+
+        preempt_disable();
+        tasklet_schedule(&jrp->irqtask[smp_processor_id()]);
+        preempt_enable();
+
+        return IRQ_HANDLED;
+}
+
+/* Deferred service handler, run as interrupt-fired tasklet */
+static void caam_jr_dequeue(unsigned long devarg)
+{
+        int hw_idx, sw_idx, i, head, tail;
+        struct device *dev = (struct device *)devarg;
+        struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
+        void (*usercall)(struct device *dev, u32 *desc, u32 status, void *arg);
+        u32 *userdesc, userstatus;
+        void *userarg;
+        unsigned long flags;
+
+        spin_lock_irqsave(&jrp->outlock, flags);
+
+        head = ACCESS_ONCE(jrp->head);
+        sw_idx = tail = jrp->tail;
+
+        while (CIRC_CNT(head, tail, JOBR_DEPTH) >= 1 &&
+               rd_reg32(&jrp->rregs->outring_used)) {
+
+                hw_idx = jrp->out_ring_read_index;
+                for (i = 0; CIRC_CNT(head, tail + i, JOBR_DEPTH) >= 1; i++) {
+                        sw_idx = (tail + i) & (JOBR_DEPTH - 1);
+
+                        smp_read_barrier_depends();
+
+                        if (jrp->outring[hw_idx].desc ==
+                            jrp->entinfo[sw_idx].desc_addr_dma)
+                                break; /* found */
+                }
+                /* we should never fail to find a matching descriptor */
+                BUG_ON(CIRC_CNT(head, tail + i, JOBR_DEPTH) <= 0);
+
+                /* Unmap just-run descriptor so we can post-process */
+                dma_unmap_single(dev, jrp->outring[hw_idx].desc,
+                                 jrp->entinfo[sw_idx].desc_size,
+                                 DMA_TO_DEVICE);
+
+                /* mark completed, avoid matching on a recycled desc addr */
+                jrp->entinfo[sw_idx].desc_addr_dma = 0;
+
+                /* Stash callback params for use outside of lock */
+                usercall = jrp->entinfo[sw_idx].callbk;
+                userarg = jrp->entinfo[sw_idx].cbkarg;
+                userdesc = jrp->entinfo[sw_idx].desc_addr_virt;
+                userstatus = jrp->outring[hw_idx].jrstatus;
+
+                smp_mb();
+
+                jrp->out_ring_read_index = (jrp->out_ring_read_index + 1) &
+                                           (JOBR_DEPTH - 1);
+
+                /*
+                 * if this job completed out-of-order, do not increment
+                 * the tail.  Otherwise, increment tail by 1 plus the
+                 * number of subsequent jobs already completed out-of-order
+                 */
+                if (sw_idx == tail) {
+                        do {
+                                tail = (tail + 1) & (JOBR_DEPTH - 1);
+                                smp_read_barrier_depends();
+                        } while (CIRC_CNT(head, tail, JOBR_DEPTH) >= 1 &&
+                                 jrp->entinfo[tail].desc_addr_dma == 0);
+
+                        jrp->tail = tail;
+                }
+
+                /* set done */
+                wr_reg32(&jrp->rregs->outring_rmvd, 1);
+
+                spin_unlock_irqrestore(&jrp->outlock, flags);
+
+                /* Finally, execute user's callback */
+                usercall(dev, userdesc, userstatus, userarg);
+
+                spin_lock_irqsave(&jrp->outlock, flags);
+
+                head = ACCESS_ONCE(jrp->head);
+                sw_idx = tail = jrp->tail;
+        }
+
+        spin_unlock_irqrestore(&jrp->outlock, flags);
+
+        /* reenable / unmask IRQs */
+        clrbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK);
+}
+
+/**
+ * caam_jr_register() - Alloc a ring for someone to use as needed. Returns
+ * an ordinal of the rings allocated, else returns -ENODEV if no rings
+ * are available.
+ * @ctrldev: points to the controller level dev (parent) that
+ *           owns rings available for use.
+ * @dev:     points to where a pointer to the newly allocated queue's
+ *           dev can be written to if successful.
+ **/
+int caam_jr_register(struct device *ctrldev, struct device **rdev)
+{
+        struct caam_drv_private *ctrlpriv = dev_get_drvdata(ctrldev);
+        struct caam_drv_private_jr *jrpriv = NULL;
+        unsigned long flags;
+        int ring;
+
+        /* Lock, if free ring - assign, unlock */
+        spin_lock_irqsave(&ctrlpriv->jr_alloc_lock, flags);
+        for (ring = 0; ring < ctrlpriv->total_jobrs; ring++) {
+                jrpriv = dev_get_drvdata(ctrlpriv->jrdev[ring]);
+                if (jrpriv->assign == JOBR_UNASSIGNED) {
+                        jrpriv->assign = JOBR_ASSIGNED;
+                        *rdev = ctrlpriv->jrdev[ring];
+                        spin_unlock_irqrestore(&ctrlpriv->jr_alloc_lock, flags);
+                        return ring;
+                }
+        }
+
+        /* If assigned, write dev where caller needs it */
+        spin_unlock_irqrestore(&ctrlpriv->jr_alloc_lock, flags);
+        *rdev = NULL;
+
+        return -ENODEV;
+}
+EXPORT_SYMBOL(caam_jr_register);
+
+/**
+ * caam_jr_deregister() - Deregister an API and release the queue.
+ * Returns 0 if OK, -EBUSY if queue still contains pending entries
+ * or unprocessed results at the time of the call
+ * @dev     - points to the dev that identifies the queue to
+ *            be released.
+ **/
+int caam_jr_deregister(struct device *rdev)
+{
+        struct caam_drv_private_jr *jrpriv = dev_get_drvdata(rdev);
+        struct caam_drv_private *ctrlpriv;
+        unsigned long flags;
+
+        /* Get the owning controller's private space */
+        ctrlpriv = dev_get_drvdata(jrpriv->parentdev);
+
+        /*
+         * Make sure ring empty before release
+         */
+        if (rd_reg32(&jrpriv->rregs->outring_used) ||
+            (rd_reg32(&jrpriv->rregs->inpring_avail) != JOBR_DEPTH))
+                return -EBUSY;
+
+        /* Release ring */
+        spin_lock_irqsave(&ctrlpriv->jr_alloc_lock, flags);
+        jrpriv->assign = JOBR_UNASSIGNED;
+        spin_unlock_irqrestore(&ctrlpriv->jr_alloc_lock, flags);
+
+        return 0;
+}
+EXPORT_SYMBOL(caam_jr_deregister);
+
+/**
+ * caam_jr_enqueue() - Enqueue a job descriptor head. Returns 0 if OK,
+ * -EBUSY if the queue is full, -EIO if it cannot map the caller's
+ * descriptor.
+ * @dev:  device of the job ring to be used. This device should have
+ *        been assigned prior by caam_jr_register().
+ * @desc: points to a job descriptor that execute our request. All
+ *        descriptors (and all referenced data) must be in a DMAable
+ *        region, and all data references must be physical addresses
+ *        accessible to CAAM (i.e. within a PAMU window granted
+ *        to it).
+ * @cbk:  pointer to a callback function to be invoked upon completion
+ *        of this request. This has the form:
+ *        callback(struct device *dev, u32 *desc, u32 stat, void *arg)
+ *        where:
+ *        @dev:    contains the job ring device that processed this
+ *                 response.
+ *        @desc:   descriptor that initiated the request, same as
+ *                 "desc" being argued to caam_jr_enqueue().
+ *        @status: untranslated status received from CAAM. See the
+ *                 reference manual for a detailed description of
+ *                 error meaning, or see the JRSTA definitions in the
+ *                 register header file
+ *        @areq:   optional pointer to an argument passed with the
+ *                 original request
+ * @areq: optional pointer to a user argument for use at callback
+ *        time.
+ **/
+int caam_jr_enqueue(struct device *dev, u32 *desc,
+                    void (*cbk)(struct device *dev, u32 *desc,
+                                u32 status, void *areq),
+                    void *areq)
+{
+        struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
+        struct caam_jrentry_info *head_entry;
+        unsigned long flags;
+        int head, tail, desc_size;
+        dma_addr_t desc_dma;
+
+        desc_size = (*desc & HDR_JD_LENGTH_MASK) * sizeof(u32);
+        desc_dma = dma_map_single(dev, desc, desc_size, DMA_TO_DEVICE);
+        if (dma_mapping_error(dev, desc_dma)) {
+                dev_err(dev, "caam_jr_enqueue(): can't map jobdesc\n");
+                return -EIO;
+        }
+
+        spin_lock_irqsave(&jrp->inplock, flags);
+
+        head = jrp->head;
+        tail = ACCESS_ONCE(jrp->tail);
+
+        if (!rd_reg32(&jrp->rregs->inpring_avail) ||
+            CIRC_SPACE(head, tail, JOBR_DEPTH) <= 0) {
+                spin_unlock_irqrestore(&jrp->inplock, flags);
+                dma_unmap_single(dev, desc_dma, desc_size, DMA_TO_DEVICE);
+                return -EBUSY;
+        }
+
+        head_entry = &jrp->entinfo[head];
+        head_entry->desc_addr_virt = desc;
+        head_entry->desc_size = desc_size;
+        head_entry->callbk = (void *)cbk;
+        head_entry->cbkarg = areq;
+        head_entry->desc_addr_dma = desc_dma;
+
+        jrp->inpring[jrp->inp_ring_write_index] = desc_dma;
+
+        smp_wmb();
+
+        jrp->inp_ring_write_index = (jrp->inp_ring_write_index + 1) &
+                                    (JOBR_DEPTH - 1);
+        jrp->head = (head + 1) & (JOBR_DEPTH - 1);
+
+        wmb();
+
+        wr_reg32(&jrp->rregs->inpring_jobadd, 1);
+
+        spin_unlock_irqrestore(&jrp->inplock, flags);
+
+        return 0;
+}
+EXPORT_SYMBOL(caam_jr_enqueue);
+
+static int caam_reset_hw_jr(struct device *dev)
+{
+        struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
+        unsigned int timeout = 100000;
+
+        /*
+         * FIXME: disabling IRQs here inhibits proper job completion
+         * and error propagation
+         */
+        disable_irq(jrp->irq);
+
+        /* initiate flush (required prior to reset) */
+        wr_reg32(&jrp->rregs->jrcommand, JRCR_RESET);
+        while (((rd_reg32(&jrp->rregs->jrintstatus) & JRINT_ERR_HALT_MASK) ==
+                JRINT_ERR_HALT_INPROGRESS) && --timeout)
+                cpu_relax();
+
+        if ((rd_reg32(&jrp->rregs->jrintstatus) & JRINT_ERR_HALT_MASK) !=
+            JRINT_ERR_HALT_COMPLETE || timeout == 0) {
+                dev_err(dev, "failed to flush job ring %d\n", jrp->ridx);
+                return -EIO;
+        }
+
+        /* initiate reset */
+        timeout = 100000;
+        wr_reg32(&jrp->rregs->jrcommand, JRCR_RESET);
+        while ((rd_reg32(&jrp->rregs->jrcommand) & JRCR_RESET) && --timeout)
+                cpu_relax();
+
+        if (timeout == 0) {
+                dev_err(dev, "failed to reset job ring %d\n", jrp->ridx);
+                return -EIO;
+        }
+
+        enable_irq(jrp->irq);
+
+        return 0;
+}
+
+/*
+ * Init JobR independent of platform property detection
+ */
+static int caam_jr_init(struct device *dev)
+{
+        struct caam_drv_private_jr *jrp;
+        dma_addr_t inpbusaddr, outbusaddr;
+        int i, error;
+
+        jrp = dev_get_drvdata(dev);
+
+        error = caam_reset_hw_jr(dev);
+        if (error)
+                return error;
+
+        jrp->inpring = kzalloc(sizeof(dma_addr_t) * JOBR_DEPTH,
+                               GFP_KERNEL | GFP_DMA);
+        jrp->outring = kzalloc(sizeof(struct jr_outentry) *
+                               JOBR_DEPTH, GFP_KERNEL | GFP_DMA);
+
+        jrp->entinfo = kzalloc(sizeof(struct caam_jrentry_info) * JOBR_DEPTH,
+                               GFP_KERNEL);
+
+        if ((jrp->inpring == NULL) || (jrp->outring == NULL) ||
+            (jrp->entinfo == NULL)) {
+                dev_err(dev, "can't allocate job rings for %d\n",
+                        jrp->ridx);
+                return -ENOMEM;
+        }
+
+        for (i = 0; i < JOBR_DEPTH; i++)
+                jrp->entinfo[i].desc_addr_dma = !0;
+
+        /* Setup rings */
+        inpbusaddr = dma_map_single(dev, jrp->inpring,
+                                    sizeof(u32 *) * JOBR_DEPTH,
+                                    DMA_BIDIRECTIONAL);
+        if (dma_mapping_error(dev, inpbusaddr)) {
+                dev_err(dev, "caam_jr_init(): can't map input ring\n");
+                kfree(jrp->inpring);
+                kfree(jrp->outring);
+                kfree(jrp->entinfo);
+                return -EIO;
+        }
+
+        outbusaddr = dma_map_single(dev, jrp->outring,
+                                    sizeof(struct jr_outentry) * JOBR_DEPTH,
+                                    DMA_BIDIRECTIONAL);
+        if (dma_mapping_error(dev, outbusaddr)) {
+                dev_err(dev, "caam_jr_init(): can't map output ring\n");
+                        dma_unmap_single(dev, inpbusaddr,
+                                         sizeof(u32 *) * JOBR_DEPTH,
+                                         DMA_BIDIRECTIONAL);
+                kfree(jrp->inpring);
+                kfree(jrp->outring);
+                kfree(jrp->entinfo);
+                return -EIO;
+        }
+
+        jrp->inp_ring_write_index = 0;
+        jrp->out_ring_read_index = 0;
+        jrp->head = 0;
+        jrp->tail = 0;
+
+        wr_reg64(&jrp->rregs->inpring_base, inpbusaddr);
+        wr_reg64(&jrp->rregs->outring_base, outbusaddr);
+        wr_reg32(&jrp->rregs->inpring_size, JOBR_DEPTH);
+        wr_reg32(&jrp->rregs->outring_size, JOBR_DEPTH);
+
+        jrp->ringsize = JOBR_DEPTH;
+
+        spin_lock_init(&jrp->inplock);
+        spin_lock_init(&jrp->outlock);
+
+        /* Select interrupt coalescing parameters */
+        setbits32(&jrp->rregs->rconfig_lo, JOBR_INTC |
+                  (JOBR_INTC_COUNT_THLD << JRCFG_ICDCT_SHIFT) |
+                  (JOBR_INTC_TIME_THLD << JRCFG_ICTT_SHIFT));
+
+        /* Connect job ring interrupt handler. */
+        for_each_possible_cpu(i)
+                tasklet_init(&jrp->irqtask[i], caam_jr_dequeue,
+                             (unsigned long)dev);
+
+        error = request_irq(jrp->irq, caam_jr_interrupt, 0,
+                            "caam-jobr", dev);
+        if (error) {
+                dev_err(dev, "can't connect JobR %d interrupt (%d)\n",
+                        jrp->ridx, jrp->irq);
+                irq_dispose_mapping(jrp->irq);
+                jrp->irq = 0;
+                dma_unmap_single(dev, inpbusaddr, sizeof(u32 *) * JOBR_DEPTH,
+                                 DMA_BIDIRECTIONAL);
+                dma_unmap_single(dev, outbusaddr, sizeof(u32 *) * JOBR_DEPTH,
+                                 DMA_BIDIRECTIONAL);
+                kfree(jrp->inpring);
+                kfree(jrp->outring);
+                kfree(jrp->entinfo);
+                return -EINVAL;
+        }
+
+        jrp->assign = JOBR_UNASSIGNED;
+        return 0;
+}
+
+/*
+ * Shutdown JobR independent of platform property code
+ */
+int caam_jr_shutdown(struct device *dev)
+{
+        struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
+        dma_addr_t inpbusaddr, outbusaddr;
+        int ret, i;
+
+        ret = caam_reset_hw_jr(dev);
+
+        for_each_possible_cpu(i)
+                tasklet_kill(&jrp->irqtask[i]);
+
+        /* Release interrupt */
+        free_irq(jrp->irq, dev);
+
+        /* Free rings */
+        inpbusaddr = rd_reg64(&jrp->rregs->inpring_base);
+        outbusaddr = rd_reg64(&jrp->rregs->outring_base);
+        dma_unmap_single(dev, outbusaddr,
+                         sizeof(struct jr_outentry) * JOBR_DEPTH,
+                         DMA_BIDIRECTIONAL);
+        dma_unmap_single(dev, inpbusaddr, sizeof(u32 *) * JOBR_DEPTH,
+                         DMA_BIDIRECTIONAL);
+        kfree(jrp->outring);
+        kfree(jrp->inpring);
+        kfree(jrp->entinfo);
+
+        return ret;
+}
+
+/*
+ * Probe routine for each detected JobR subsystem. It assumes that
+ * property detection was picked up externally.
+ */
+int caam_jr_probe(struct platform_device *pdev, struct device_node *np,
+                  int ring)
+{
+        struct device *ctrldev, *jrdev;
+        struct platform_device *jr_pdev;
+        struct caam_drv_private *ctrlpriv;
+        struct caam_drv_private_jr *jrpriv;
+        u32 *jroffset;
+        int error;
+
+        ctrldev = &pdev->dev;
+        ctrlpriv = dev_get_drvdata(ctrldev);
+
+        jrpriv = kmalloc(sizeof(struct caam_drv_private_jr),
+                         GFP_KERNEL);
+        if (jrpriv == NULL) {
+                dev_err(ctrldev, "can't alloc private mem for job ring %d\n",
+                        ring);
+                return -ENOMEM;
+        }
+        jrpriv->parentdev = ctrldev; /* point back to parent */
+        jrpriv->ridx = ring; /* save ring identity relative to detection */
+
+        /*
+         * Derive a pointer to the detected JobRs regs
+         * Driver has already iomapped the entire space, we just
+         * need to add in the offset to this JobR. Don't know if I
+         * like this long-term, but it'll run
+         */
+        jroffset = (u32 *)of_get_property(np, "reg", NULL);
+        jrpriv->rregs = (struct caam_job_ring __iomem *)((void *)ctrlpriv->ctrl
+                                                         + *jroffset);
+
+        /* Build a local dev for each detected queue */
+        jr_pdev = of_platform_device_create(np, NULL, ctrldev);
+        if (jr_pdev == NULL) {
+                kfree(jrpriv);
+                return -EINVAL;
+        }
+        jrdev = &jr_pdev->dev;
+        dev_set_drvdata(jrdev, jrpriv);
+        ctrlpriv->jrdev[ring] = jrdev;
+
+        /* Identify the interrupt */
+        jrpriv->irq = of_irq_to_resource(np, 0, NULL);
+
+        /* Now do the platform independent part */
+        error = caam_jr_init(jrdev); /* now turn on hardware */
+        if (error) {
+                kfree(jrpriv);
+                return error;
+        }
+
+        return error;
+}