crypto: xilinx: prevent probing on non-xilinx hardware

The zynqmp-sha driver is always loaded and register its algorithm even on
platform which do not have the proper hardware.
This lead to a stacktrace due to zynqmp-sha3-384 failing its crypto
self tests.
So check if hardware is present via the firmware API call get_version.

While at it, simplify the platform_driver by using module_platform_driver()

Furthermore the driver should depend on ZYNQMP_FIRMWARE since it cannot
work without it.

Fixes: 7ecc3e34474b ("crypto: xilinx - Add Xilinx SHA3 driver")
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index bf4e55e..597559e 100644 (file)
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -810,7 +810,7 @@ config CRYPTO_DEV_ZYNQMP_AES
 
 config CRYPTO_DEV_ZYNQMP_SHA3
        bool "Support for Xilinx ZynqMP SHA3 hardware accelerator"
-       depends on ARCH_ZYNQMP
+       depends on ZYNQMP_FIRMWARE
        select CRYPTO_SHA3
        help
          Xilinx ZynqMP has SHA3 engine used for secure hash calculation.

diff --git a/drivers/crypto/xilinx/zynqmp-sha.c b/drivers/crypto/xilinx/zynqmp-sha.c
index 89549f4..43ff170 100644 (file)
--- a/drivers/crypto/xilinx/zynqmp-sha.c
+++ b/drivers/crypto/xilinx/zynqmp-sha.c
@@ -193,6 +193,13 @@ static int zynqmp_sha_probe(struct platform_device *pdev)
 {
        struct device *dev = &pdev->dev;
        int err;
+       u32 v;
+
+       /* Verify the hardware is present */
+       err = zynqmp_pm_get_api_version(&v);
+       if (err)
+               return err;
+
 
        err = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(ZYNQMP_DMA_BIT_MASK));
        if (err < 0) {
@@ -251,33 +258,7 @@ static struct platform_driver zynqmp_sha_driver = {
        },
 };
 
-static int __init sha_driver_init(void)
-{
-       struct platform_device *pdev;
-       int ret;
-
-       ret = platform_driver_register(&zynqmp_sha_driver);
-       if (ret)
-               return ret;
-
-       pdev = platform_device_register_simple(zynqmp_sha_driver.driver.name,
-                                              0, NULL, 0);
-       if (IS_ERR(pdev)) {
-               ret = PTR_ERR(pdev);
-               platform_driver_unregister(&zynqmp_sha_driver);
-               pr_info("Failed to register ZynqMP SHA3 dvixe %d\n", ret);
-       }
-
-       return ret;
-}
-
-device_initcall(sha_driver_init);
-
-static void __exit sha_driver_exit(void)
-{
-       platform_driver_unregister(&zynqmp_sha_driver);
-}
-
+module_platform_driver(zynqmp_sha_driver);
 MODULE_DESCRIPTION("ZynqMP SHA3 hardware acceleration support.");
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Harsha <harsha.harsha@xilinx.com>");