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crypto: qcom-rng - Add ACPI support

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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>
Tested-by: Jeffrey Hugo <jhugo@codeaurora.org>
[port to crypto API]
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Timur Tabi 2018-07-16 11:20:27 +05:30 committed by Herbert Xu
parent ba3ab6371c
commit d96542ac10
1 changed files with 17 additions and 3 deletions
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20
drivers/crypto/qcom-rng.c
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@ -4,6 +4,7 @@
// Based on msm-rng.c and downstream driver // Based on msm-rng.c and downstream driver
#include <crypto/internal/rng.h> #include <crypto/internal/rng.h>
#include <linux/acpi.h>
#include <linux/clk.h> #include <linux/clk.h>
#include <linux/crypto.h> #include <linux/crypto.h>
#include <linux/module.h> #include <linux/module.h>
@ -168,9 +169,13 @@ static int qcom_rng_probe(struct platform_device *pdev)
if (IS_ERR(rng->base)) if (IS_ERR(rng->base))
return PTR_ERR(rng->base); return PTR_ERR(rng->base);
rng->clk = devm_clk_get(&pdev->dev, "core"); /* ACPI systems have clk already on, so skip clk_get */
if (IS_ERR(rng->clk)) if (!has_acpi_companion(&pdev->dev)) {
return PTR_ERR(rng->clk); 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); 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; 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[] = { static const struct of_device_id qcom_rng_of_match[] = {
{ .compatible = "qcom,prng", .data = (void *)0}, { .compatible = "qcom,prng", .data = (void *)0},
{ .compatible = "qcom,prng-ee", .data = (void *)1}, { .compatible = "qcom,prng-ee", .data = (void *)1},
@ -206,6 +219,7 @@ static struct platform_driver qcom_rng_driver = {
.driver = { .driver = {
.name = KBUILD_MODNAME, .name = KBUILD_MODNAME,
.of_match_table = of_match_ptr(qcom_rng_of_match), .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); module_platform_driver(qcom_rng_driver);