Messages in this thread Patch in this message |  | | From | Jean-Michel Hautbois via B4 Relay <> | | Date | Wed, 26 Nov 2025 08:08:10 +0100 | | Subject | [PATCH v4 2/2] m68k: coldfire: Add RNG support for MCF54418 |
| |
From: Jean-Michel Hautbois <jeanmichel.hautbois@yoseli.org>
Add support for the hardware Random Number Generator (RNGB) found on MCF54418 ColdFire processors with clock enabled at platform initialization.
The RNGB block is compatible with the imx-rngc driver.
Reviewed-by: Frank Li <Frank.Li@nxp.com> Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@yoseli.org> --- arch/m68k/coldfire/device.c | 28 ++++++++++++++++++++++++++++ arch/m68k/coldfire/m5441x.c | 2 +- arch/m68k/include/asm/m5441xsim.h | 9 +++++++++ drivers/char/hw_random/Kconfig | 3 ++- drivers/char/hw_random/imx-rngc.c | 7 +++++++ 5 files changed, 47 insertions(+), 2 deletions(-)
diff --git a/arch/m68k/coldfire/device.c b/arch/m68k/coldfire/device.c index b6958ec2a220..9d8f844e319a 100644 --- a/arch/m68k/coldfire/device.c +++ b/arch/m68k/coldfire/device.c @@ -622,6 +622,31 @@ static struct platform_device mcf_flexcan0 = { }; #endif /* MCFFLEXCAN_SIZE */ +#ifdef MCF_RNG_BASE +/* + * Random Number Generator (RNG) - only on MCF54418 + */ +static struct resource mcf_rng_resource[] = { + { + .start = MCF_RNG_BASE, + .end = MCF_RNG_BASE + MCF_RNG_SIZE - 1, + .flags = IORESOURCE_MEM, + }, + { + .start = MCF_IRQ_RNG, + .end = MCF_IRQ_RNG, + .flags = IORESOURCE_IRQ, + }, +}; + +static struct platform_device mcf_rng = { + .name = "imx-rngc", + .id = -1, + .num_resources = ARRAY_SIZE(mcf_rng_resource), + .resource = mcf_rng_resource, +}; +#endif /* MCF_RNG_BASE */ + static struct platform_device *mcf_devices[] __initdata = { &mcf_uart, #ifdef MCFFEC_BASE0 @@ -660,6 +685,9 @@ static struct platform_device *mcf_devices[] __initdata = { #ifdef MCFFLEXCAN_SIZE &mcf_flexcan0, #endif +#ifdef MCF_RNG_BASE + &mcf_rng, +#endif }; /* diff --git a/arch/m68k/coldfire/m5441x.c b/arch/m68k/coldfire/m5441x.c index 7a25cfc7ac07..ab5b00637237 100644 --- a/arch/m68k/coldfire/m5441x.c +++ b/arch/m68k/coldfire/m5441x.c @@ -158,6 +158,7 @@ static struct clk * const enable_clks[] __initconst = { &__clk_0_33, /* pit.1 */ &__clk_0_37, /* eport */ &__clk_0_48, /* pll */ + &__clk_0_49, /* rng */ &__clk_0_51, /* esdhc */ &__clk_1_36, /* CCM/reset module/Power management */ @@ -179,7 +180,6 @@ static struct clk * const disable_clks[] __initconst = { &__clk_0_44, /* usb otg */ &__clk_0_45, /* usb host */ &__clk_0_47, /* ssi.0 */ - &__clk_0_49, /* rng */ &__clk_0_50, /* ssi.1 */ &__clk_0_53, /* enet-fec */ &__clk_0_54, /* enet-fec */ diff --git a/arch/m68k/include/asm/m5441xsim.h b/arch/m68k/include/asm/m5441xsim.h index f48cf63bd782..dd64cdfcad3e 100644 --- a/arch/m68k/include/asm/m5441xsim.h +++ b/arch/m68k/include/asm/m5441xsim.h @@ -198,6 +198,15 @@ #define MCFRTC_SIZE (0xfc0a8840 - 0xfc0a8000) #define MCF_IRQ_RTC (MCFINT2_VECBASE + MCFINT2_RTC) +/* + * Random Number Generator (RNG) Module. + * Note: Only present in MCF54418, not in MCF54410/54415/54417 + */ +#define MCF_RNG_BASE 0xfc0c4000 +#define MCF_RNG_SIZE 0x1c +#define MCFINT2_RNG 28 +#define MCF_IRQ_RNG (MCFINT2_VECBASE + MCFINT2_RNG) + /* * GPIO Module. */ diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index 492a2a61a65b..2f301e43db84 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -270,12 +270,13 @@ config HW_RANDOM_MXC_RNGA config HW_RANDOM_IMX_RNGC tristate "Freescale i.MX RNGC Random Number Generator" depends on HAS_IOMEM - depends on SOC_IMX25 || SOC_IMX6SL || SOC_IMX6SLL || SOC_IMX6UL || COMPILE_TEST + depends on SOC_IMX25 || SOC_IMX6SL || SOC_IMX6SLL || SOC_IMX6UL || COLDFIRE || COMPILE_TEST default HW_RANDOM help This driver provides kernel-side support for the Random Number Generator Version C hardware found on some Freescale i.MX processors. Version B is also supported by this driver. + Also supports RNGB on Freescale MCF54418 (Coldfire V4e). To compile this driver as a module, choose M here: the module will be called imx-rngc. diff --git a/drivers/char/hw_random/imx-rngc.c b/drivers/char/hw_random/imx-rngc.c index d6a847e48339..44f20a05de0a 100644 --- a/drivers/char/hw_random/imx-rngc.c +++ b/drivers/char/hw_random/imx-rngc.c @@ -353,12 +353,19 @@ static const struct of_device_id imx_rngc_dt_ids[] = { }; MODULE_DEVICE_TABLE(of, imx_rngc_dt_ids); +static const struct platform_device_id imx_rngc_devtype[] = { + { .name = "imx-rngc" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(platform, imx_rngc_devtype); + static struct platform_driver imx_rngc_driver = { .driver = { .name = KBUILD_MODNAME, .pm = pm_ptr(&imx_rngc_pm_ops), .of_match_table = imx_rngc_dt_ids, }, + .id_table = imx_rngc_devtype, }; module_platform_driver_probe(imx_rngc_driver, imx_rngc_probe); -- 2.39.5
|  |