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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>
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1 parent 4b504b6 commit 232e5ef16c709cff519cfd131b33e01115d8a34c @mgreeraz mgreeraz committed with Joel A Fernandes Dec 18, 2012
Showing with 106 additions and 33 deletions.
  1. +106 −33 drivers/crypto/omap-sham.c
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@@ -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,
},
};

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