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path: root/drivers/crypto/caam/jr.c
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Diffstat (limited to 'drivers/crypto/caam/jr.c')
-rw-r--r--drivers/crypto/caam/jr.c517
1 files changed, 517 insertions, 0 deletions
diff --git a/drivers/crypto/caam/jr.c b/drivers/crypto/caam/jr.c
new file mode 100644
index 000000000000..340fa322c0f0
--- /dev/null
+++ b/drivers/crypto/caam/jr.c
@@ -0,0 +1,517 @@
+/*
+ * 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;
+
+ /*
+ * mask interrupts since we are going to poll
+ * for reset completion status
+ */
+ setbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK);
+
+ /* 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;
+ }
+
+ /* unmask interrupts */
+ clrbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK);
+
+ 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);
+
+ /* 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, IRQF_SHARED,
+ "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;
+ return -EINVAL;
+ }
+
+ 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));
+
+ 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;
+}
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