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Message-Id: <20251124-b4-m5441x-add-rng-support-v3-3-f447251dad27@yoseli.org>
Date: Mon, 24 Nov 2025 14:04:08 +0100
From: Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org>
To: Greg Ungerer <gerg@...ux-m68k.org>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Olivia Mackall <olivia@...enic.com>,
Herbert Xu <herbert@...dor.apana.org.au>, Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>
Cc: linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org,
linux-crypto@...r.kernel.org, imx@...ts.linux.dev,
linux-arm-kernel@...ts.infradead.org,
Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org>
Subject: [PATCH v3 3/3] m68k: coldfire: Add RNG support for MCF54418
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.
Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@...eli.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 20adba27a687029ef53249bad71b342d563d612b..4183929b0b501459da25d1b4cde7d77f19c3dc16 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 const 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 7a25cfc7ac07570ff15da3c55d080a717cf93a06..ab5b006372379294db3b522820de88137bfb7e78 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 f48cf63bd7822fd53c33788128f984585c0c421a..dd64cdfcad3e810254c6854b9de5b6bbeb67b950 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 492a2a61a65be8bd9e46b0a70f3e43703973512e..2f301e43db846c687a38377a164429818137ece2 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 d6a847e48339b2758c73c95d57a7aa48eb4875e0..44f20a05de0a425cb6ff7b2a347b111750ac3702 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
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