diff options
| -rw-r--r-- | Documentation/devicetree/bindings/rng/omap3_rom_rng.txt | 27 | ||||
| -rw-r--r-- | arch/arm/boot/dts/omap3-n900.dts | 6 | ||||
| -rw-r--r-- | arch/arm/mach-omap2/pdata-quirks.c | 12 | ||||
| -rw-r--r-- | drivers/char/hw_random/omap3-rom-rng.c | 17 |
4 files changed, 49 insertions, 13 deletions
diff --git a/Documentation/devicetree/bindings/rng/omap3_rom_rng.txt b/Documentation/devicetree/bindings/rng/omap3_rom_rng.txt new file mode 100644 index 000000000000..f315c9723bd2 --- /dev/null +++ b/Documentation/devicetree/bindings/rng/omap3_rom_rng.txt @@ -0,0 +1,27 @@ +OMAP ROM RNG driver binding + +Secure SoCs may provide RNG via secure ROM calls like Nokia N900 does. The +implementation can depend on the SoC secure ROM used. + +- compatible: + Usage: required + Value type: <string> + Definition: must be "nokia,n900-rom-rng" + +- clocks: + Usage: required + Value type: <prop-encoded-array> + Definition: reference to the the RNG interface clock + +- clock-names: + Usage: required + Value type: <stringlist> + Definition: must be "ick" + +Example: + + rom_rng: rng { + compatible = "nokia,n900-rom-rng"; + clocks = <&rng_ick>; + clock-names = "ick"; + }; diff --git a/arch/arm/boot/dts/omap3-n900.dts b/arch/arm/boot/dts/omap3-n900.dts index 84a5ade1e865..63659880eeb3 100644 --- a/arch/arm/boot/dts/omap3-n900.dts +++ b/arch/arm/boot/dts/omap3-n900.dts @@ -155,6 +155,12 @@ pwms = <&pwm9 0 26316 0>; /* 38000 Hz */ }; + rom_rng: rng { + compatible = "nokia,n900-rom-rng"; + clocks = <&rng_ick>; + clock-names = "ick"; + }; + /* controlled (enabled/disabled) directly by bcm2048 and wl1251 */ vctcxo: vctcxo { compatible = "fixed-clock"; diff --git a/arch/arm/mach-omap2/pdata-quirks.c b/arch/arm/mach-omap2/pdata-quirks.c index b49ec3fbee4c..62cc90722848 100644 --- a/arch/arm/mach-omap2/pdata-quirks.c +++ b/arch/arm/mach-omap2/pdata-quirks.c @@ -262,14 +262,6 @@ static void __init am3517_evm_legacy_init(void) am35xx_emac_reset(); } -static struct platform_device omap3_rom_rng_device = { - .name = "omap3-rom-rng", - .id = -1, - .dev = { - .platform_data = rx51_secure_rng_call, - }, -}; - static void __init nokia_n900_legacy_init(void) { hsmmc2_internal_input_clk(); @@ -285,9 +277,6 @@ static void __init nokia_n900_legacy_init(void) pr_warn("RX-51: Not enabling ARM errata 430973 workaround\n"); pr_warn("Thumb binaries may crash randomly without this workaround\n"); } - - pr_info("RX-51: Registering OMAP3 HWRNG device\n"); - platform_device_register(&omap3_rom_rng_device); } } @@ -627,6 +616,7 @@ static struct of_dev_auxdata omap_auxdata_lookup[] = { OF_DEV_AUXDATA("ti,davinci_mdio", 0x5c030000, "davinci_mdio.0", NULL), OF_DEV_AUXDATA("ti,am3517-emac", 0x5c000000, "davinci_emac.0", &am35xx_emac_pdata), + OF_DEV_AUXDATA("nokia,n900-rom-rng", 0, NULL, rx51_secure_rng_call), /* McBSP modules with sidetone core */ #if IS_ENABLED(CONFIG_SND_SOC_OMAP_MCBSP) OF_DEV_AUXDATA("ti,omap3-mcbsp", 0x49022000, "49022000.mcbsp", &mcbsp_pdata), diff --git a/drivers/char/hw_random/omap3-rom-rng.c b/drivers/char/hw_random/omap3-rom-rng.c index 38b719017186..34e10f05545a 100644 --- a/drivers/char/hw_random/omap3-rom-rng.c +++ b/drivers/char/hw_random/omap3-rom-rng.c @@ -20,6 +20,8 @@ #include <linux/workqueue.h> #include <linux/clk.h> #include <linux/err.h> +#include <linux/of.h> +#include <linux/of_device.h> #include <linux/platform_device.h> #define RNG_RESET 0x01 @@ -86,14 +88,18 @@ static int omap3_rom_rng_read(struct hwrng *rng, void *data, size_t max, bool w) static struct hwrng omap3_rom_rng_ops = { .name = "omap3-rom", - .read = omap3_rom_rng_read, }; static int omap3_rom_rng_probe(struct platform_device *pdev) { int ret = 0; - pr_info("initializing\n"); + omap3_rom_rng_ops.read = of_device_get_match_data(&pdev->dev); + if (!omap3_rom_rng_ops.read) { + dev_err(&pdev->dev, "missing rom code handler\n"); + + return -ENODEV; + } omap3_rom_rng_call = pdev->dev.platform_data; if (!omap3_rom_rng_call) { @@ -125,9 +131,16 @@ static int omap3_rom_rng_remove(struct platform_device *pdev) return 0; } +static const struct of_device_id omap_rom_rng_match[] = { + { .compatible = "nokia,n900-rom-rng", .data = omap3_rom_rng_read, }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, omap_rom_rng_match); + static struct platform_driver omap3_rom_rng_driver = { .driver = { .name = "omap3-rom-rng", + .of_match_table = omap_rom_rng_match, }, .probe = omap3_rom_rng_probe, .remove = omap3_rom_rng_remove, |