crypto: omap-sham - Add Device Tree Support

Add Device Tree suport to the omap-sham crypto
driver.  Currently, only support for OMAP2 and
OMAP3 is being added but support for OMAP4 will
be added in a subsequent patch.

CC: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/omap-sham.c

@@ -30,6 +30,10 @@
 #include <linux/dmaengine.h>
 #include <linux/omap-dma.h>
 #include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
 #include <linux/delay.h>
 #include <linux/crypto.h>
 #include <linux/cryptohash.h>
@@ -145,6 +149,7 @@ struct omap_sham_dev {
 	int			irq;
 	spinlock_t		lock;
 	int			err;
+	unsigned int		dma;
 	struct dma_chan		*dma_lch;
 	struct tasklet_struct	done_task;
 
@@ -1155,13 +1160,99 @@ static irqreturn_t omap_sham_irq(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id omap_sham_of_match[] = {
+	{
+		.compatible	= "ti,omap2-sham",
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, omap_sham_of_match);
+
+static int omap_sham_get_res_of(struct omap_sham_dev *dd,
+		struct device *dev, struct resource *res)
+{
+	struct device_node *node = dev->of_node;
+	const struct of_device_id *match;
+	int err = 0;
+
+	match = of_match_device(of_match_ptr(omap_sham_of_match), dev);
+	if (!match) {
+		dev_err(dev, "no compatible OF match\n");
+		err = -EINVAL;
+		goto err;
+	}
+
+	err = of_address_to_resource(node, 0, res);
+	if (err < 0) {
+		dev_err(dev, "can't translate OF node address\n");
+		err = -EINVAL;
+		goto err;
+	}
+
+	dd->irq = of_irq_to_resource(node, 0, NULL);
+	if (!dd->irq) {
+		dev_err(dev, "can't translate OF irq value\n");
+		err = -EINVAL;
+		goto err;
+	}
+
+	dd->dma = -1; /* Dummy value that's unused */
+
+err:
+	return err;
+}
+#else
+static int omap_sham_get_res_dev(struct omap_sham_dev *dd,
+		struct device *dev, struct resource *res)
+{
+	return -EINVAL;
+}
+#endif
+
+static int omap_sham_get_res_pdev(struct omap_sham_dev *dd,
+		struct platform_device *pdev, struct resource *res)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *r;
+	int err = 0;
+
+	/* Get the base address */
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!r) {
+		dev_err(dev, "no MEM resource info\n");
+		err = -ENODEV;
+		goto err;
+	}
+	memcpy(res, r, sizeof(*res));
+
+	/* Get the IRQ */
+	dd->irq = platform_get_irq(pdev, 0);
+	if (dd->irq < 0) {
+		dev_err(dev, "no IRQ resource info\n");
+		err = dd->irq;
+		goto err;
+	}
+
+	/* Get the DMA */
+	r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+	if (!r) {
+		dev_err(dev, "no DMA resource info\n");
+		err = -ENODEV;
+		goto err;
+	}
+	dd->dma = r->start;
+
+err:
+	return err;
+}
+
 static int __devinit omap_sham_probe(struct platform_device *pdev)
 {
 	struct omap_sham_dev *dd;
 	struct device *dev = &pdev->dev;
-	struct resource *res;
+	struct resource res;
 	dma_cap_mask_t mask;
-	unsigned dma_chan;
 	int err, i, j;
 
 	dd = kzalloc(sizeof(struct omap_sham_dev), GFP_KERNEL);
@@ -1178,33 +1269,18 @@ static int __devinit omap_sham_probe(struct platform_device *pdev)
 	tasklet_init(&dd->done_task, omap_sham_done_task, (unsigned long)dd);
 	crypto_init_queue(&dd->queue, OMAP_SHAM_QUEUE_LENGTH);
 
-	dd->irq = -1;
-
-	/* Get the base address */
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(dev, "no MEM resource info\n");
-		err = -ENODEV;
-		goto res_err;
-	}
-	dd->phys_base = res->start;
-
-	/* Get the DMA */
-	res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
-	if (!res) {
-		dev_err(dev, "no DMA resource info\n");
-		err = -ENODEV;
+	err = (dev->of_node) ? omap_sham_get_res_of(dd, dev, &res) :
+			       omap_sham_get_res_pdev(dd, pdev, &res);
+	if (err)
 		goto res_err;
-	}
-	dma_chan = res->start;
 
-	/* Get the IRQ */
-	dd->irq = platform_get_irq(pdev,  0);
-	if (dd->irq < 0) {
-		dev_err(dev, "no IRQ resource info\n");
-		err = dd->irq;
+	dd->io_base = devm_request_and_ioremap(dev, &res);
+	if (!dd->io_base) {
+		dev_err(dev, "can't ioremap\n");
+		err = -ENOMEM;
 		goto res_err;
 	}
+	dd->phys_base = res.start;
 
 	err = request_irq(dd->irq, omap_sham_irq,
 			IRQF_TRIGGER_LOW, dev_name(dev), dd);
@@ -1216,10 +1292,10 @@ static int __devinit omap_sham_probe(struct platform_device *pdev)
 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
 
-	dd->dma_lch = dma_request_channel(mask, omap_dma_filter_fn, &dma_chan);
+	dd->dma_lch = dma_request_channel(mask, omap_dma_filter_fn, &dd->dma);
 	if (!dd->dma_lch) {
 		dev_err(dev, "unable to obtain RX DMA engine channel %u\n",
-			dma_chan);
+			dd->dma);
 		err = -ENXIO;
 		goto dma_err;
 	}
@@ -1255,13 +1331,11 @@ static int __devinit omap_sham_probe(struct platform_device *pdev)
 err_algs:
 	for (j = 0; j < i; j++)
 		crypto_unregister_ahash(&algs[j]);
-	iounmap(dd->io_base);
 	pm_runtime_disable(dev);
 io_err:
 	dma_release_channel(dd->dma_lch);
 dma_err:
-	if (dd->irq >= 0)
-		free_irq(dd->irq, dd);
+	free_irq(dd->irq, dd);
 res_err:
 	kfree(dd);
 	dd = NULL;
@@ -1285,11 +1359,9 @@ static int __devexit omap_sham_remove(struct platform_device *pdev)
 	for (i = 0; i < ARRAY_SIZE(algs); i++)
 		crypto_unregister_ahash(&algs[i]);
 	tasklet_kill(&dd->done_task);
-	iounmap(dd->io_base);
 	pm_runtime_disable(&pdev->dev);
 	dma_release_channel(dd->dma_lch);
-	if (dd->irq >= 0)
-		free_irq(dd->irq, dd);
+	free_irq(dd->irq, dd);
 	kfree(dd);
 	dd = NULL;
 
@@ -1321,6 +1393,7 @@ static struct platform_driver omap_sham_driver = {
 		.name	= "omap-sham",
 		.owner	= THIS_MODULE,
 		.pm	= &omap_sham_pm_ops,
+		.of_match_table	= omap_sham_of_match,
 	},
 };