| /* |
| * CAAM/SEC 4.x transport/backend driver |
| * JobR backend functionality |
| * |
| * Copyright 2008-2015 Freescale Semiconductor, Inc. |
| */ |
| |
| #include <linux/of_irq.h> |
| #include <linux/of_address.h> |
| |
| #include "compat.h" |
| #include "regs.h" |
| #include "jr.h" |
| #include "desc.h" |
| #include "intern.h" |
| |
| struct jr_driver_data { |
| /* List of Physical JobR's with the Driver */ |
| struct list_head jr_list; |
| spinlock_t jr_alloc_lock; /* jr_list lock */ |
| } ____cacheline_aligned; |
| |
| static struct jr_driver_data driver_data; |
| |
| 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; |
| } |
| |
| /* |
| * 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; |
| |
| ret = caam_reset_hw_jr(dev); |
| |
| tasklet_kill(&jrp->irqtask); |
| |
| /* Release interrupt */ |
| free_irq(jrp->irq, dev); |
| |
| /* Free rings */ |
| inpbusaddr = rd_reg64(&jrp->rregs->inpring_base); |
| outbusaddr = rd_reg64(&jrp->rregs->outring_base); |
| dma_free_coherent(dev, sizeof(dma_addr_t) * JOBR_DEPTH, |
| jrp->inpring, inpbusaddr); |
| dma_free_coherent(dev, sizeof(struct jr_outentry) * JOBR_DEPTH, |
| jrp->outring, outbusaddr); |
| kfree(jrp->entinfo); |
| |
| return ret; |
| } |
| |
| static int caam_jr_remove(struct platform_device *pdev) |
| { |
| int ret; |
| struct device *jrdev; |
| struct caam_drv_private_jr *jrpriv; |
| |
| jrdev = &pdev->dev; |
| jrpriv = dev_get_drvdata(jrdev); |
| |
| /* |
| * Return EBUSY if job ring already allocated. |
| */ |
| if (atomic_read(&jrpriv->tfm_count)) { |
| dev_err(jrdev, "Device is busy\n"); |
| return -EBUSY; |
| } |
| |
| /* Remove the node from Physical JobR list maintained by driver */ |
| spin_lock(&driver_data.jr_alloc_lock); |
| list_del(&jrpriv->list_node); |
| spin_unlock(&driver_data.jr_alloc_lock); |
| |
| /* Release ring */ |
| ret = caam_jr_shutdown(jrdev); |
| if (ret) |
| dev_err(jrdev, "Failed to shut down job ring\n"); |
| irq_dispose_mapping(jrpriv->irq); |
| |
| return ret; |
| } |
| |
| /* 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); |
| 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; |
| dma_addr_t outbusaddr; |
| |
| outbusaddr = rd_reg64(&jrp->rregs->outring_base); |
| |
| while (rd_reg32(&jrp->rregs->outring_used)) { |
| |
| head = ACCESS_ONCE(jrp->head); |
| |
| spin_lock(&jrp->outlock); |
| |
| sw_idx = tail = jrp->tail; |
| hw_idx = jrp->out_ring_read_index; |
| dma_sync_single_for_cpu(dev, outbusaddr, |
| sizeof(struct jr_outentry) * JOBR_DEPTH, |
| DMA_FROM_DEVICE); |
| |
| for (i = 0; CIRC_CNT(head, tail + i, JOBR_DEPTH) >= 1; i++) { |
| sw_idx = (tail + i) & (JOBR_DEPTH - 1); |
| |
| 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(); |
| |
| /* set done */ |
| wr_reg32(&jrp->rregs->outring_rmvd, 1); |
| |
| 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); |
| } while (CIRC_CNT(head, tail, JOBR_DEPTH) >= 1 && |
| jrp->entinfo[tail].desc_addr_dma == 0); |
| |
| jrp->tail = tail; |
| } |
| |
| spin_unlock(&jrp->outlock); |
| |
| /* Finally, execute user's callback */ |
| usercall(dev, userdesc, userstatus, userarg); |
| } |
| |
| /* reenable / unmask IRQs */ |
| clrbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK); |
| } |
| |
| /** |
| * caam_jr_alloc() - Alloc a job ring for someone to use as needed. |
| * |
| * returns : pointer to the newly allocated physical |
| * JobR dev can be written to if successful. |
| **/ |
| struct device *caam_jr_alloc(void) |
| { |
| struct caam_drv_private_jr *jrpriv, *min_jrpriv = NULL; |
| struct device *dev = NULL; |
| int min_tfm_cnt = INT_MAX; |
| int tfm_cnt; |
| |
| spin_lock(&driver_data.jr_alloc_lock); |
| |
| if (list_empty(&driver_data.jr_list)) { |
| spin_unlock(&driver_data.jr_alloc_lock); |
| return ERR_PTR(-ENODEV); |
| } |
| |
| list_for_each_entry(jrpriv, &driver_data.jr_list, list_node) { |
| tfm_cnt = atomic_read(&jrpriv->tfm_count); |
| if (tfm_cnt < min_tfm_cnt) { |
| min_tfm_cnt = tfm_cnt; |
| min_jrpriv = jrpriv; |
| } |
| if (!min_tfm_cnt) |
| break; |
| } |
| |
| if (min_jrpriv) { |
| atomic_inc(&min_jrpriv->tfm_count); |
| dev = min_jrpriv->dev; |
| } |
| spin_unlock(&driver_data.jr_alloc_lock); |
| |
| return dev; |
| } |
| EXPORT_SYMBOL(caam_jr_alloc); |
| |
| /** |
| * caam_jr_free() - Free the Job Ring |
| * @rdev - points to the dev that identifies the Job ring to |
| * be released. |
| **/ |
| void caam_jr_free(struct device *rdev) |
| { |
| struct caam_drv_private_jr *jrpriv = dev_get_drvdata(rdev); |
| |
| atomic_dec(&jrpriv->tfm_count); |
| } |
| EXPORT_SYMBOL(caam_jr_free); |
| |
| /** |
| * 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. |
| * @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; |
| int head, tail, desc_size; |
| dma_addr_t desc_dma, inpbusaddr; |
| |
| 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; |
| } |
| |
| dma_sync_single_for_device(dev, desc_dma, desc_size, DMA_TO_DEVICE); |
| |
| inpbusaddr = rd_reg64(&jrp->rregs->inpring_base); |
| dma_sync_single_for_device(dev, inpbusaddr, |
| sizeof(dma_addr_t) * JOBR_DEPTH, |
| DMA_TO_DEVICE); |
| |
| spin_lock_bh(&jrp->inplock); |
| |
| head = jrp->head; |
| tail = ACCESS_ONCE(jrp->tail); |
| |
| if (!rd_reg32(&jrp->rregs->inpring_avail) || |
| CIRC_SPACE(head, tail, JOBR_DEPTH) <= 0) { |
| spin_unlock_bh(&jrp->inplock); |
| 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; |
| |
| dma_sync_single_for_device(dev, inpbusaddr, |
| sizeof(dma_addr_t) * JOBR_DEPTH, |
| DMA_TO_DEVICE); |
| |
| 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_bh(&jrp->inplock); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(caam_jr_enqueue); |
| |
| /* |
| * 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); |
| |
| tasklet_init(&jrp->irqtask, caam_jr_dequeue, (unsigned long)dev); |
| |
| /* Connect job ring interrupt handler. */ |
| error = request_irq(jrp->irq, caam_jr_interrupt, IRQF_SHARED, |
| dev_name(dev), dev); |
| if (error) { |
| dev_err(dev, "can't connect JobR %d interrupt (%d)\n", |
| jrp->ridx, jrp->irq); |
| goto out_kill_deq; |
| } |
| |
| error = caam_reset_hw_jr(dev); |
| if (error) |
| goto out_free_irq; |
| |
| error = -ENOMEM; |
| jrp->inpring = dma_alloc_coherent(dev, sizeof(dma_addr_t) * JOBR_DEPTH, |
| &inpbusaddr, GFP_KERNEL); |
| if (!jrp->inpring) |
| goto out_free_irq; |
| |
| jrp->outring = dma_alloc_coherent(dev, sizeof(struct jr_outentry) * |
| JOBR_DEPTH, &outbusaddr, GFP_KERNEL); |
| if (!jrp->outring) |
| goto out_free_inpring; |
| |
| jrp->entinfo = kzalloc(sizeof(struct caam_jrentry_info) * JOBR_DEPTH, |
| GFP_KERNEL); |
| if (!jrp->entinfo) |
| goto out_free_outring; |
| |
| for (i = 0; i < JOBR_DEPTH; i++) |
| jrp->entinfo[i].desc_addr_dma = !0; |
| |
| /* Setup rings */ |
| 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)); |
| |
| return 0; |
| |
| out_free_outring: |
| dma_free_coherent(dev, sizeof(struct jr_outentry) * JOBR_DEPTH, |
| jrp->outring, outbusaddr); |
| out_free_inpring: |
| dma_free_coherent(dev, sizeof(dma_addr_t) * JOBR_DEPTH, |
| jrp->inpring, inpbusaddr); |
| dev_err(dev, "can't allocate job rings for %d\n", jrp->ridx); |
| out_free_irq: |
| free_irq(jrp->irq, dev); |
| out_kill_deq: |
| tasklet_kill(&jrp->irqtask); |
| return error; |
| } |
| |
| |
| /* |
| * Probe routine for each detected JobR subsystem. |
| */ |
| static int caam_jr_probe(struct platform_device *pdev) |
| { |
| struct device *jrdev; |
| struct device_node *nprop; |
| struct caam_job_ring __iomem *ctrl; |
| struct caam_drv_private_jr *jrpriv; |
| static int total_jobrs; |
| int error; |
| |
| jrdev = &pdev->dev; |
| jrpriv = devm_kmalloc(jrdev, sizeof(struct caam_drv_private_jr), |
| GFP_KERNEL); |
| if (!jrpriv) |
| return -ENOMEM; |
| |
| dev_set_drvdata(jrdev, jrpriv); |
| |
| /* save ring identity relative to detection */ |
| jrpriv->ridx = total_jobrs++; |
| |
| nprop = pdev->dev.of_node; |
| /* Get configuration properties from device tree */ |
| /* First, get register page */ |
| ctrl = of_iomap(nprop, 0); |
| if (!ctrl) { |
| dev_err(jrdev, "of_iomap() failed\n"); |
| return -ENOMEM; |
| } |
| |
| jrpriv->rregs = (struct caam_job_ring __force *)ctrl; |
| |
| if (sizeof(dma_addr_t) == sizeof(u64)) |
| if (of_device_is_compatible(nprop, "fsl,sec-v5.0-job-ring")) |
| dma_set_mask_and_coherent(jrdev, DMA_BIT_MASK(40)); |
| else |
| dma_set_mask_and_coherent(jrdev, DMA_BIT_MASK(36)); |
| else |
| dma_set_mask_and_coherent(jrdev, DMA_BIT_MASK(32)); |
| |
| /* Identify the interrupt */ |
| jrpriv->irq = irq_of_parse_and_map(nprop, 0); |
| if (jrpriv->irq <= 0) { |
| kfree(jrpriv); |
| return -EINVAL; |
| } |
| |
| /* Now do the platform independent part */ |
| error = caam_jr_init(jrdev); /* now turn on hardware */ |
| if (error) { |
| irq_dispose_mapping(jrpriv->irq); |
| return error; |
| } |
| |
| jrpriv->dev = jrdev; |
| spin_lock(&driver_data.jr_alloc_lock); |
| list_add_tail(&jrpriv->list_node, &driver_data.jr_list); |
| spin_unlock(&driver_data.jr_alloc_lock); |
| |
| atomic_set(&jrpriv->tfm_count, 0); |
| |
| device_init_wakeup(&pdev->dev, 1); |
| device_set_wakeup_enable(&pdev->dev, false); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM |
| static int caam_jr_suspend(struct device *dev) |
| { |
| struct platform_device *pdev = to_platform_device(dev); |
| struct caam_drv_private_jr *jrpriv = platform_get_drvdata(pdev); |
| |
| if (device_may_wakeup(&pdev->dev)) |
| enable_irq_wake(jrpriv->irq); |
| |
| return 0; |
| } |
| |
| static int caam_jr_resume(struct device *dev) |
| { |
| struct platform_device *pdev = to_platform_device(dev); |
| struct caam_drv_private_jr *jrpriv = platform_get_drvdata(pdev); |
| |
| if (device_may_wakeup(&pdev->dev)) |
| disable_irq_wake(jrpriv->irq); |
| |
| return 0; |
| } |
| |
| static SIMPLE_DEV_PM_OPS(caam_jr_pm_ops, caam_jr_suspend, |
| caam_jr_resume); |
| #endif |
| |
| static struct of_device_id caam_jr_match[] = { |
| { |
| .compatible = "fsl,sec-v4.0-job-ring", |
| }, |
| { |
| .compatible = "fsl,sec4.0-job-ring", |
| }, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, caam_jr_match); |
| |
| static struct platform_driver caam_jr_driver = { |
| .driver = { |
| .name = "caam_jr", |
| .of_match_table = caam_jr_match, |
| #ifdef CONFIG_PM |
| .pm = &caam_jr_pm_ops, |
| #endif |
| }, |
| .probe = caam_jr_probe, |
| .remove = caam_jr_remove, |
| }; |
| |
| static int __init jr_driver_init(void) |
| { |
| spin_lock_init(&driver_data.jr_alloc_lock); |
| INIT_LIST_HEAD(&driver_data.jr_list); |
| return platform_driver_register(&caam_jr_driver); |
| } |
| |
| static void __exit jr_driver_exit(void) |
| { |
| platform_driver_unregister(&caam_jr_driver); |
| } |
| |
| module_init(jr_driver_init); |
| module_exit(jr_driver_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_DESCRIPTION("FSL CAAM JR request backend"); |
| MODULE_AUTHOR("Freescale Semiconductor - NMG/STC"); |