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Signed-off-by: Alexander Stein Acked-by: Conor Dooley Reviewed-by: Frank Li --- include/dt-bindings/nvmem/fsl,imx8mn-ocotp.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) create mode 100644 include/dt-bindings/nvmem/fsl,imx8mn-ocotp.h diff --git a/include/dt-bindings/nvmem/fsl,imx8mn-ocotp.h b/include/dt-bind= ings/nvmem/fsl,imx8mn-ocotp.h new file mode 100644 index 0000000000000..6e554edefd488 --- /dev/null +++ b/include/dt-bindings/nvmem/fsl,imx8mn-ocotp.h @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0 OR MIT */ + +#ifndef _DT_BINDINGS_NVMEM_IMX8MN_OCOTP_H +#define _DT_BINDINGS_NVMEM_IMX8MN_OCOTP_H + +#define IMX8MN_OCOTP_M7_DISABLE 0 +#define IMX8MN_OCOTP_M7_MPU_DISABLE 1 +#define IMX8MN_OCOTP_M7_FPU_DISABLE 2 +#define IMX8MN_OCOTP_USB_OTG1_DISABLE 3 +#define IMX8MN_OCOTP_GPU3D_DISABLE 4 +#define IMX8MN_OCOTP_MIPI_DSI_DISABLE 5 +#define IMX8MN_OCOTP_ENET_DISABLE 6 +#define IMX8MN_OCOTP_MIPI_CSI_DISABLE 7 +#define IMX8MN_OCOTP_ASRC_DISABLE 8 + +#endif --=20 2.34.1 From nobody Mon Feb 9 00:55:51 2026 Received: from mx1.tq-group.com (mx1.tq-group.com [93.104.207.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E07CC1E570A; 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charset="utf-8" Move linux/delay.h to the right position. Signed-off-by: Alexander Stein Reviewed-by: Frank Li --- drivers/nvmem/imx-ocotp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/nvmem/imx-ocotp.c b/drivers/nvmem/imx-ocotp.c index 79dd4fda03295..c5086a16450ac 100644 --- a/drivers/nvmem/imx-ocotp.c +++ b/drivers/nvmem/imx-ocotp.c @@ -15,6 +15,7 @@ */ =20 #include +#include #include #include #include @@ -22,7 +23,6 @@ #include #include #include -#include =20 #define IMX_OCOTP_OFFSET_B0W0 0x400 /* Offset from base address of the * OTP Bank0 Word0 --=20 2.34.1 From nobody Mon Feb 9 00:55:51 2026 Received: from mx1.tq-group.com (mx1.tq-group.com [93.104.207.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D65C31E5729; Thu, 30 Jan 2025 13:01:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=93.104.207.81 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; 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charset="utf-8" i.MX8M OCOTP supports a specific peripheral or function being fused which means disabled, so - Introduce disable_fuse for a list of possible fused peripherals. - Iterate all nodes to check accessing permission. If not allowed to be accessed, detach the node Signed-off-by: Alexander Stein Reviewed-by: Frank Li --- drivers/nvmem/Kconfig | 3 ++ drivers/nvmem/imx-ocotp.c | 105 +++++++++++++++++++++++++++++++++++++- 2 files changed, 107 insertions(+), 1 deletion(-) diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig index 8671b7c974b93..ba5c928cab520 100644 --- a/drivers/nvmem/Kconfig +++ b/drivers/nvmem/Kconfig @@ -84,6 +84,9 @@ config NVMEM_IMX_OCOTP This driver can also be built as a module. If so, the module will be called nvmem-imx-ocotp. =20 + If built as modules, any other driver relying on this working + as access controller also needs to be a module as well. + config NVMEM_IMX_OCOTP_ELE tristate "i.MX On-Chip OTP Controller support" depends on ARCH_MXC || COMPILE_TEST diff --git a/drivers/nvmem/imx-ocotp.c b/drivers/nvmem/imx-ocotp.c index c5086a16450ac..e3ea026a37d0d 100644 --- a/drivers/nvmem/imx-ocotp.c +++ b/drivers/nvmem/imx-ocotp.c @@ -23,6 +23,7 @@ #include #include #include +#include =20 #define IMX_OCOTP_OFFSET_B0W0 0x400 /* Offset from base address of the * OTP Bank0 Word0 @@ -91,11 +92,20 @@ struct ocotp_ctrl_reg { u32 bm_rel_shadows; }; =20 +#define OCOTP_MAX_NUM_GATE_WORDS 4 + +struct disable_fuse { + u32 fuse_addr; + u32 mask; +}; + struct ocotp_params { unsigned int nregs; unsigned int bank_address_words; void (*set_timing)(struct ocotp_priv *priv); struct ocotp_ctrl_reg ctrl; + u32 num_disables; + struct disable_fuse *disables; }; =20 static int imx_ocotp_wait_for_busy(struct ocotp_priv *priv, u32 flags) @@ -552,11 +562,25 @@ static const struct ocotp_params imx8mm_params =3D { .ctrl =3D IMX_OCOTP_BM_CTRL_DEFAULT, }; =20 +struct disable_fuse imx8mn_disable_fuse[] =3D { + [IMX8MN_OCOTP_M7_DISABLE] =3D { .fuse_addr =3D 20, .mask =3D BIT(8) }, + [IMX8MN_OCOTP_M7_MPU_DISABLE] =3D { .fuse_addr =3D 20, .mask =3D BIT(9) = }, + [IMX8MN_OCOTP_M7_FPU_DISABLE] =3D { .fuse_addr =3D 20, .mask =3D BIT(10)= }, + [IMX8MN_OCOTP_USB_OTG1_DISABLE] =3D { .fuse_addr =3D 20, .mask =3D BIT(1= 1) }, + [IMX8MN_OCOTP_GPU3D_DISABLE] =3D { .fuse_addr =3D 20, .mask =3D BIT(24) = }, + [IMX8MN_OCOTP_MIPI_DSI_DISABLE] =3D { .fuse_addr =3D 20, .mask =3D BIT(2= 8) }, + [IMX8MN_OCOTP_ENET_DISABLE] =3D { .fuse_addr =3D 20, .mask =3D BIT(29) }, + [IMX8MN_OCOTP_MIPI_CSI_DISABLE] =3D { .fuse_addr =3D 20, .mask =3D BIT(3= 0) }, + [IMX8MN_OCOTP_ASRC_DISABLE] =3D { .fuse_addr =3D 20, .mask =3D BIT(31) }, +}; + static const struct ocotp_params imx8mn_params =3D { .nregs =3D 256, .bank_address_words =3D 0, .set_timing =3D imx_ocotp_set_imx6_timing, .ctrl =3D IMX_OCOTP_BM_CTRL_DEFAULT, + .num_disables =3D ARRAY_SIZE(imx8mn_disable_fuse), + .disables =3D imx8mn_disable_fuse, }; =20 static const struct ocotp_params imx8mp_params =3D { @@ -589,6 +613,81 @@ static void imx_ocotp_fixup_dt_cell_info(struct nvmem_= device *nvmem, cell->read_post_process =3D imx_ocotp_cell_pp; } =20 +static int imx_ocotp_check_access(struct ocotp_priv *priv, u32 id) +{ + u32 addr, mask, ret, val; + + if (id >=3D priv->params->num_disables) { + dev_err(priv->dev, "Index %d too large\n", id); + return -EACCES; + } + + addr =3D priv->params->disables[id].fuse_addr; + mask =3D priv->params->disables[id].mask; + + ret =3D imx_ocotp_read(priv, addr, &val, sizeof(val)); + if (ret) + return ret; + + dev_dbg(priv->dev, "id:%d addr:%#x mask:0x%08x\n", id, addr, mask); + /* true means disabled */ + if (val & mask) + return -EACCES; + + return 0; +} + +static int imx_ocotp_grant_access(struct ocotp_priv *priv, struct device_n= ode *parent) +{ + struct device *dev =3D priv->dev; + + for_each_available_child_of_node_scoped(parent, child) { + struct of_phandle_args args; + u32 id, idx =3D 0; + + while (!of_parse_phandle_with_args(child, "access-controllers", + "#access-controller-cells", + idx++, &args)) { + of_node_put(args.np); + if (args.np !=3D dev->of_node) + continue; + + /* Only support one cell */ + if (args.args_count !=3D 1) { + dev_err(dev, "wrong args count\n"); + continue; + } + + id =3D args.args[0]; + + dev_dbg(dev, "Checking node: %pOF disable ID: %d\n", child, id); + + if (imx_ocotp_check_access(priv, id)) { + of_detach_node(child); + dev_info(dev, "%pOF: disabled by fuse, device driver will not be probe= d\n", + child); + } + } + + imx_ocotp_grant_access(priv, child); + } + + return 0; +} + +static int imx_ocotp_access_control(struct ocotp_priv *priv) +{ + struct device_node *root __free(device_node) =3D of_find_node_by_path("/"= ); + + if (!priv->params->disables) + return 0; + + if (WARN_ON(!root)) + return -EINVAL; + + return imx_ocotp_grant_access(priv, root); +} + static int imx_ocotp_probe(struct platform_device *pdev) { struct device *dev =3D &pdev->dev; @@ -622,9 +721,13 @@ static int imx_ocotp_probe(struct platform_device *pde= v) imx_ocotp_clr_err_if_set(priv); clk_disable_unprepare(priv->clk); 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charset="utf-8" Mark ocotp as a access-controller and add references on peripherals which can be disabled (fused). Signed-off-by: Alexander Stein --- arch/arm64/boot/dts/freescale/imx8mn.dtsi | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/arm64/boot/dts/freescale/imx8mn.dtsi b/arch/arm64/boot/dt= s/freescale/imx8mn.dtsi index a5f9cfb46e5dd..b023724679b80 100644 --- a/arch/arm64/boot/dts/freescale/imx8mn.dtsi +++ b/arch/arm64/boot/dts/freescale/imx8mn.dtsi @@ -9,6 +9,7 @@ #include #include #include +#include #include =20 #include "imx8mn-pinfunc.h" @@ -431,6 +432,7 @@ easrc: easrc@300c0000 { firmware-name =3D "imx/easrc/easrc-imx8mn.bin"; fsl,asrc-rate =3D <8000>; fsl,asrc-format =3D <2>; + access-controllers =3D <&ocotp IMX8MN_OCOTP_ASRC_DISABLE>; status =3D "disabled"; }; }; @@ -571,6 +573,7 @@ ocotp: efuse@30350000 { clocks =3D <&clk IMX8MN_CLK_OCOTP_ROOT>; #address-cells =3D <1>; #size-cells =3D <1>; + #access-controller-cells =3D <1>; =20 /* * The register address below maps to the MX8M @@ -1053,6 +1056,7 @@ fec1: ethernet@30be0000 { nvmem-cells =3D <&fec_mac_address>; nvmem-cell-names =3D "mac-address"; fsl,stop-mode =3D <&gpr 0x10 3>; + access-controllers =3D <&ocotp IMX8MN_OCOTP_ENET_DISABLE>; status =3D "disabled"; }; =20 @@ -1091,6 +1095,7 @@ mipi_dsi: dsi@32e10000 { clock-names =3D "bus_clk", "sclk_mipi"; interrupts =3D ; power-domains =3D <&disp_blk_ctrl IMX8MN_DISPBLK_PD_MIPI_DSI>; + access-controllers =3D <&ocotp IMX8MN_OCOTP_MIPI_DSI_DISABLE>; status =3D "disabled"; =20 ports { @@ -1195,6 +1200,7 @@ mipi_csi: mipi-csi@32e30000 { <&clk IMX8MN_CLK_DISP_AXI_ROOT>; clock-names =3D "pclk", "wrap", "phy", "axi"; power-domains =3D <&disp_blk_ctrl IMX8MN_DISPBLK_PD_MIPI_CSI>; + access-controllers =3D <&ocotp IMX8MN_OCOTP_MIPI_CSI_DISABLE>; status =3D "disabled"; =20 ports { @@ -1225,6 +1231,7 @@ usbotg1: usb@32e40000 { phys =3D <&usbphynop1>; fsl,usbmisc =3D <&usbmisc1 0>; power-domains =3D <&pgc_hsiomix>; + access-controllers =3D <&ocotp IMX8MN_OCOTP_USB_OTG1_DISABLE>; status =3D "disabled"; }; =20 @@ -1288,6 +1295,7 @@ gpu: gpu@38000000 { <400000000>, <1200000000>; power-domains =3D <&pgc_gpumix>; + access-controllers =3D <&ocotp IMX8MN_OCOTP_GPU3D_DISABLE>; }; =20 gic: interrupt-controller@38800000 { --=20 2.34.1