crypto: caam - Add Platform driver for Job Ring

The SEC Job Rings are now available as individual devices.
This would enable sharing of job rings between kernel and
user space. Job Rings can now be dynamically bound/unbound
from kernel.

Changes are made in the following layers of CAAM Driver
1. Controller driver
        - Does basic initialization of CAAM Block.
        - Creates platform devices for Job Rings.
(Earlier the initialization of Job ring  was done
 by the controller driver)

2. JobRing Platform driver
        - Manages the platform Job Ring devices created
          by the controller driver

Signed-off-by: Ruchika Gupta <ruchika.gupta@freescale.com>
Reviewed-by: Garg Vakul-B16394 <vakul@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 177 insertions, 108 deletions

diff --git a/drivers/crypto/caam/jr.c b/drivers/crypto/caam/jr.c
index 105ba4d..cdeaf25 100644
--- a/drivers/crypto/caam/jr.c
+++ b/drivers/crypto/caam/jr.c
@@ -11,6 +11,114 @@
 #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);
+
+	/*
+	 * Make sure ring is empty before release
+	 */
+	if (rd_reg32(&jrpriv->rregs->outring_used) ||
+	    (rd_reg32(&jrpriv->rregs->inpring_avail) != JOBR_DEPTH)) {
+		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)
 {
@@ -205,46 +313,6 @@ 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
  */
@@ -260,7 +328,7 @@ 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);
@@ -316,86 +384,43 @@ 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));
@@ -403,15 +428,59 @@ 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 = of_irq_to_resource(np, 0, NULL);
+	jrpriv->irq = of_irq_to_resource(nprop, 0, NULL);
 
 	/* 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);
+
+	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");