From: Jeffrey Hugo <jhugo@codeaurora.org>
To: Vinod Koul <vkoul@kernel.org>,
linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>,
Matt Mackall <mpm@selenic.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-arm-msm@vger.kernel.org, Stephen Boyd <swboyd@chromium.org>,
Timur Tabi <timur@codeaurora.org>
Subject: Re: [PATCH v4 6/6] crypto: qcom: Add ACPI support
Date: Thu, 5 Jul 2018 13:51:38 -0600 [thread overview]
Message-ID: <9e57d7d7-cc7b-c602-0e53-620fc3370ceb@codeaurora.org> (raw)
In-Reply-To: <20180704114427.29953-7-vkoul@kernel.org>
On 7/4/2018 5:44 AM, Vinod Koul wrote:
> From: Timur Tabi <timur@codeaurora.org>
>
> Add support for probing on ACPI systems, with ACPI HID QCOM8160.
>
> On ACPI systems, clocks are always enabled, the PRNG should
> already be enabled, and the register region is read-only.
> The driver only verifies that the hardware is already
> enabled never tries to disable or configure it.
>
> Signed-off-by: Timur Tabi <timur@codeaurora.org>
> [port to crypto API]
> Signed-off-by: Vinod Koul <vkoul@kernel.org>
Tested-by: Jeffrey Hugo <jhugo@codeaurora.org>
> ---
> drivers/crypto/qcom-rng.c | 30 ++++++++++++++++++++++++++----
> 1 file changed, 26 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/crypto/qcom-rng.c b/drivers/crypto/qcom-rng.c
> index f1bd86acaf9d..385352e200db 100644
> --- a/drivers/crypto/qcom-rng.c
> +++ b/drivers/crypto/qcom-rng.c
> @@ -4,6 +4,7 @@
> // Based on msm-rng.c and downstream driver
>
> #include <crypto/internal/rng.h>
> +#include <linux/acpi.h>
> #include <linux/clk.h>
> #include <linux/crypto.h>
> #include <linux/module.h>
> @@ -168,11 +169,21 @@ static int qcom_rng_probe(struct platform_device *pdev)
> if (IS_ERR(rng->base))
> return PTR_ERR(rng->base);
>
> - rng->clk = devm_clk_get(&pdev->dev, "core");
> - if (IS_ERR(rng->clk))
> - return PTR_ERR(rng->clk);
>
> - rng->skip_init = (unsigned long)of_device_get_match_data(&pdev->dev);
> + /*
> + * ACPI systems have v2 hardware. The clocks are always enabled,
> + * and we should skip init
> + */
> + if (has_acpi_companion(&pdev->dev)) {
> + rng->skip_init = 1;
> + } else {
> + rng->clk = devm_clk_get(&pdev->dev, "core");
> + if (IS_ERR(rng->clk))
> + return PTR_ERR(rng->clk);
> +
> + rng->skip_init =
> + (unsigned long)of_device_get_match_data(&pdev->dev);
> + }
>
> qcom_rng_dev = rng;
> ret = crypto_register_rng(&qcom_rng_alg);
> @@ -193,6 +204,16 @@ static int qcom_rng_remove(struct platform_device *pdev)
> return 0;
> }
>
> +#if IS_ENABLED(CONFIG_ACPI)
> +static const struct acpi_device_id qcom_rng_acpi_match[] = {
> + {
> + .id = "QCOM8160",
> + },
> + {}
> +};
> +MODULE_DEVICE_TABLE(acpi, qcom_rng_acpi_match);
> +#endif
> +
> static const struct of_device_id qcom_rng_of_match[] = {
> { .compatible = "qcom,prng", .data = (void *)0},
> { .compatible = "qcom,prng-ee", .data = (void *)1},
> @@ -206,6 +227,7 @@ static struct platform_driver qcom_rng_driver = {
> .driver = {
> .name = KBUILD_MODNAME,
> .of_match_table = of_match_ptr(qcom_rng_of_match),
> + .acpi_match_table = ACPI_PTR(qcom_rng_acpi_match),
> }
> };
> module_platform_driver(qcom_rng_driver);
>
--
Jeffrey Hugo
Qualcomm Datacenter Technologies as an affiliate of Qualcomm
Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.
prev parent reply other threads:[~2018-07-05 19:51 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-04 11:44 [PATCH v4 0/6] crypto: Add Qcom PRNG support Vinod Koul
2018-07-04 11:44 ` [PATCH v4 1/6] hwrng: remove msm hw_random driver Vinod Koul
2018-07-04 11:44 ` [PATCH v4 2/6] dt-bindings: crypto: Move prng binding to crypto Vinod Koul
2018-07-04 11:44 ` [PATCH v4 3/6] crypto: Add Qcom prng driver Vinod Koul
2018-07-04 11:44 ` [PATCH v4 4/6] dt-bindings: crypto: Add new compatible qcom,prng-ee Vinod Koul
2018-07-04 11:44 ` [PATCH v4 5/6] crypto: qcom: Add support for prng-ee Vinod Koul
2018-07-04 11:44 ` [PATCH v4 6/6] crypto: qcom: Add ACPI support Vinod Koul
2018-07-04 14:46 ` Timur Tabi
2018-07-05 6:07 ` Vinod
2018-07-05 12:23 ` Timur Tabi
2018-07-05 13:24 ` Vinod
2018-07-07 18:05 ` Timur Tabi
2018-07-09 6:01 ` Vinod
2018-07-09 14:52 ` Jeffrey Hugo
2018-07-05 19:51 ` Jeffrey Hugo [this message]
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