/* * 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_FROM_DEVICE); dma_unmap_single(dev, inpbusaddr, sizeof(u32 *) * JOBR_DEPTH, DMA_TO_DEVICE); kfree(jrp->entinfo); return ret; }
/* * 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); of_device_unregister(jrp->jr_pdev); return ret; }
/* 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; dma_addr_t outbusaddr; void *userarg; unsigned long flags; outbusaddr = rd_reg64(&jrp->rregs->outring_base); dma_sync_single_for_cpu(dev, outbusaddr, sizeof(struct jr_outentry) * JOBR_DEPTH, DMA_FROM_DEVICE); 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_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, 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_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; 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_irqrestore(&jrp->inplock, flags); return 0; }