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Commit d96542ac authored by Timur Tabi's avatar Timur Tabi Committed by Herbert Xu
Browse files

crypto: qcom-rng - Add ACPI support 



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: default avatarTimur Tabi <timur@codeaurora.org>
Tested-by: default avatarJeffrey Hugo <jhugo@codeaurora.org>
[port to crypto API]
Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent ba3ab637

drivers/crypto/qcom-rng.c

+17 −3
Original line number Diff line number Diff line
@@ -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>
@@ -168,9 +169,13 @@ static int qcom_rng_probe(struct platform_device *pdev) 
	if (IS_ERR(rng->base))

		return PTR_ERR(rng->base);



	/* ACPI systems have clk already on, so skip clk_get */

	if (!has_acpi_companion(&pdev->dev)) {

		rng->clk = devm_clk_get(&pdev->dev, "core");

		if (IS_ERR(rng->clk))

			return PTR_ERR(rng->clk);

	}





	rng->skip_init = (unsigned long)device_get_match_data(&pdev->dev);
@@ -193,6 +198,14 @@ 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", .driver_data = 1 },

	{}

};

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 +219,7 @@ 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);