diff options
Diffstat (limited to 'drivers/crypto/caam/jr.c')
-rw-r--r-- | drivers/crypto/caam/jr.c | 339 |
1 files changed, 231 insertions, 108 deletions
diff --git a/drivers/crypto/caam/jr.c b/drivers/crypto/caam/jr.c index bdb786d..d23356d2 100644 --- a/drivers/crypto/caam/jr.c +++ b/drivers/crypto/caam/jr.c @@ -13,6 +13,113 @@ #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) { @@ -128,6 +235,59 @@ static void caam_jr_dequeue(unsigned long devarg) } /** + * 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. @@ -207,46 +367,6 @@ int caam_jr_enqueue(struct device *dev, u32 *desc, } 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 */ @@ -262,7 +382,7 @@ static int caam_jr_init(struct device *dev) /* Connect job ring interrupt handler. */ error = request_irq(jrp->irq, caam_jr_interrupt, IRQF_SHARED, - "caam-jobr", dev); + dev_name(dev), dev); if (error) { dev_err(dev, "can't connect JobR %d interrupt (%d)\n", jrp->ridx, jrp->irq); @@ -318,86 +438,43 @@ static int caam_jr_init(struct device *dev) 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); - of_device_unregister(jrp->jr_pdev); - - return ret; -} /* - * Probe routine for each detected JobR subsystem. It assumes that - * property detection was picked up externally. + * Probe routine for each detected JobR subsystem. */ -int caam_jr_probe(struct platform_device *pdev, struct device_node *np, - int ring) +static int caam_jr_probe(struct platform_device *pdev) { - struct device *ctrldev, *jrdev; - struct platform_device *jr_pdev; - struct caam_drv_private *ctrlpriv; + struct device *jrdev; + struct device_node *nprop; + struct caam_job_ring __iomem *ctrl; struct caam_drv_private_jr *jrpriv; - u32 *jroffset; + static int total_jobrs; int error; - ctrldev = &pdev->dev; - ctrlpriv = dev_get_drvdata(ctrldev); - + jrdev = &pdev->dev; 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); + if (!jrpriv) 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); + dev_set_drvdata(jrdev, jrpriv); - /* 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; + /* 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->jr_pdev = jr_pdev; - jrdev = &jr_pdev->dev; - dev_set_drvdata(jrdev, jrpriv); - ctrlpriv->jrdev[ring] = jrdev; + jrpriv->rregs = (struct caam_job_ring __force *)ctrl; if (sizeof(dma_addr_t) == sizeof(u64)) - if (of_device_is_compatible(np, "fsl,sec-v5.0-job-ring")) + if (of_device_is_compatible(nprop, "fsl,sec-v5.0-job-ring")) dma_set_mask(jrdev, DMA_BIT_MASK(40)); else dma_set_mask(jrdev, DMA_BIT_MASK(36)); @@ -405,15 +482,61 @@ int caam_jr_probe(struct platform_device *pdev, struct device_node *np, dma_set_mask(jrdev, DMA_BIT_MASK(32)); /* Identify the interrupt */ - jrpriv->irq = irq_of_parse_and_map(np, 0); + jrpriv->irq = irq_of_parse_and_map(nprop, 0); /* Now do the platform independent part */ error = caam_jr_init(jrdev); /* now turn on hardware */ if (error) { - of_device_unregister(jr_pdev); kfree(jrpriv); return error; } - 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); + + return 0; +} + +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", + .owner = THIS_MODULE, + .of_match_table = caam_jr_match, + }, + .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"); |