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If not allowed to be accessed, detach the node Signed-off-by: Peng Fan --- drivers/nvmem/Kconfig | 3 + drivers/nvmem/imx-ocotp-ele.c | 172 +++++++++++++++++++++++++++++++++++++++++- 2 files changed, 174 insertions(+), 1 deletion(-) diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig index 8671b7c974b933e147154bb40b5d41b5730518d2..77cc496fd5e0e1afd753534b56fe1f5ef3e3ec55 100644 --- a/drivers/nvmem/Kconfig +++ b/drivers/nvmem/Kconfig @@ -93,6 +93,9 @@ config NVMEM_IMX_OCOTP_ELE This is a driver for the On-Chip OTP Controller (OCOTP) available on i.MX SoCs which has ELE. + 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_SCU tristate "i.MX8 SCU On-Chip OTP Controller support" depends on IMX_SCU diff --git a/drivers/nvmem/imx-ocotp-ele.c b/drivers/nvmem/imx-ocotp-ele.c index ca6dd71d8a2e29888c6e556aaea116c1a967cb5f..5ea6d959ce38760eeed44a989992fb35c462c0b4 100644 --- a/drivers/nvmem/imx-ocotp-ele.c +++ b/drivers/nvmem/imx-ocotp-ele.c @@ -5,6 +5,8 @@ * Copyright 2023 NXP */ +#include +#include #include #include #include @@ -27,6 +29,7 @@ struct ocotp_map_entry { }; struct ocotp_devtype_data { + const struct ocotp_access_gates *access_gates; u32 reg_off; char *name; u32 size; @@ -36,6 +39,20 @@ struct ocotp_devtype_data { struct ocotp_map_entry entry[]; }; +#define OCOTP_MAX_NUM_GATE_WORDS 4 + +struct access_gate { + u32 word; + u32 mask; +}; + +struct ocotp_access_gates { + u32 num_words; + u32 words[OCOTP_MAX_NUM_GATE_WORDS]; + u32 num_gates; + struct access_gate *gates; +}; + struct imx_ocotp_priv { struct device *dev; void __iomem *base; @@ -131,6 +148,82 @@ static void imx_ocotp_fixup_dt_cell_info(struct nvmem_device *nvmem, cell->read_post_process = imx_ocotp_cell_pp; } +static int imx_ele_ocotp_check_access(struct imx_ocotp_priv *priv, u32 id) +{ + const struct ocotp_access_gates *access_gates = priv->data->access_gates; + void __iomem *reg = priv->base + priv->data->reg_off; + u32 word, mask, val; + + if (id >= access_gates->num_gates) { + dev_err(priv->config.dev, "Index %d too large\n", id); + return -EACCES; + } + + word = access_gates->gates[id].word; + mask = access_gates->gates[id].mask; + + reg = priv->base + priv->data->reg_off + (word << 2); + val = readl(reg); + + dev_dbg(priv->config.dev, "id:%d word:%d mask:0x%08x\n", id, word, mask); + /* true means not allow access */ + if (val & mask) + return -EACCES; + + return 0; +} + +static int imx_ele_ocotp_grant_access(struct imx_ocotp_priv *priv, struct device_node *parent) +{ + struct device *dev = priv->config.dev; + + for_each_available_child_of_node_scoped(parent, child) { + struct of_phandle_args args; + u32 id, idx = 0; + + while (!of_parse_phandle_with_args(child, "access-controllers", + "#access-controller-cells", + idx++, &args)) { + of_node_put(args.np); + if (args.np != dev->of_node) + continue; + + /* Only support one cell */ + if (args.args_count != 1) { + dev_err(dev, "wrong args count\n"); + continue; + } + + id = args.args[0]; + + dev_dbg(dev, "Checking node: %pOF gate: %d\n", child, id); + + if (imx_ele_ocotp_check_access(priv, id)) { + of_detach_node(child); + dev_info(dev, "%pOF: Not granted, device driver will not be probed\n", + child); + } + } + + imx_ele_ocotp_grant_access(priv, child); + } + + return 0; +} + +static int imx_ele_ocotp_access_control(struct imx_ocotp_priv *priv) +{ + struct device_node *root __free(device_node) = of_find_node_by_path("/"); + + if (!priv->data->access_gates) + return 0; + + /* This should never happen */ + WARN_ON(!root); + + return imx_ele_ocotp_grant_access(priv, root); +} + static int imx_ele_ocotp_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -161,14 +254,45 @@ static int imx_ele_ocotp_probe(struct platform_device *pdev) priv->config.fixup_dt_cell_info = imx_ocotp_fixup_dt_cell_info; mutex_init(&priv->lock); + platform_set_drvdata(pdev, priv); + nvmem = devm_nvmem_register(dev, &priv->config); if (IS_ERR(nvmem)) return PTR_ERR(nvmem); - return 0; + + return imx_ele_ocotp_access_control(priv); } +struct access_gate imx93_access_gate[] = { + [IMX93_OCOTP_NPU_GATE] = { .word = 19, .mask = BIT(13) }, + [IMX93_OCOTP_A550_GATE] = { .word = 19, .mask = BIT(14) }, + [IMX93_OCOTP_A551_GATE] = { .word = 19, .mask = BIT(15) }, + [IMX93_OCOTP_M33_GATE] = { .word = 19, .mask = BIT(24) }, + [IMX93_OCOTP_CAN1_FD_GATE] = { .word = 19, .mask = BIT(28) }, + [IMX93_OCOTP_CAN2_FD_GATE] = { .word = 19, .mask = BIT(29) }, + [IMX93_OCOTP_CAN1_GATE] = { .word = 19, .mask = BIT(30) }, + [IMX93_OCOTP_CAN2_GATE] = { .word = 19, .mask = BIT(31) }, + [IMX93_OCOTP_USB1_GATE] = { .word = 20, .mask = BIT(3) }, + [IMX93_OCOTP_USB2_GATE] = { .word = 20, .mask = BIT(4) }, + [IMX93_OCOTP_ENET1_GATE] = { .word = 20, .mask = BIT(5) }, + [IMX93_OCOTP_ENET2_GATE] = { .word = 20, .mask = BIT(6) }, + [IMX93_OCOTP_PXP_GATE] = { .word = 20, .mask = BIT(10) }, + [IMX93_OCOTP_MIPI_CSI1_GATE] = { .word = 20, .mask = BIT(17) }, + [IMX93_OCOTP_MIPI_DSI1_GATE] = { .word = 20, .mask = BIT(19) }, + [IMX93_OCOTP_LVDS1_GATE] = { .word = 20, .mask = BIT(24) }, + [IMX93_OCOTP_ADC1_GATE] = { .word = 21, .mask = BIT(7) }, +}; + +static const struct ocotp_access_gates imx93_access_gates_info = { + .num_words = 3, + .words = {19, 20, 21}, + .num_gates = ARRAY_SIZE(imx93_access_gate), + .gates = imx93_access_gate, +}; + static const struct ocotp_devtype_data imx93_ocotp_data = { + .access_gates = &imx93_access_gates_info, .reg_off = 0x8000, .reg_read = imx_ocotp_reg_read, .size = 2048, @@ -183,7 +307,53 @@ static const struct ocotp_devtype_data imx93_ocotp_data = { }, }; +struct access_gate imx95_access_gate[] = { + [IMX95_OCOTP_CANFD1_GATE] = { .word = 17, .mask = BIT(20) }, + [IMX95_OCOTP_CANFD2_GATE] = { .word = 17, .mask = BIT(21) }, + [IMX95_OCOTP_CANFD3_GATE] = { .word = 17, .mask = BIT(22) }, + [IMX95_OCOTP_CANFD4_GATE] = { .word = 17, .mask = BIT(23) }, + [IMX95_OCOTP_CANFD5_GATE] = { .word = 17, .mask = BIT(24) }, + [IMX95_OCOTP_CAN1_GATE] = { .word = 17, .mask = BIT(25) }, + [IMX95_OCOTP_CAN2_GATE] = { .word = 17, .mask = BIT(26) }, + [IMX95_OCOTP_CAN3_GATE] = { .word = 17, .mask = BIT(27) }, + [IMX95_OCOTP_CAN4_GATE] = { .word = 17, .mask = BIT(28) }, + [IMX95_OCOTP_CAN5_GATE] = { .word = 17, .mask = BIT(29) }, + [IMX95_OCOTP_NPU_GATE] = { .word = 18, .mask = BIT(0) }, + [IMX95_OCOTP_A550_GATE] = { .word = 18, .mask = BIT(1) }, + [IMX95_OCOTP_A551_GATE] = { .word = 18, .mask = BIT(2) }, + [IMX95_OCOTP_A552_GATE] = { .word = 18, .mask = BIT(3) }, + [IMX95_OCOTP_A553_GATE] = { .word = 18, .mask = BIT(4) }, + [IMX95_OCOTP_A554_GATE] = { .word = 18, .mask = BIT(5) }, + [IMX95_OCOTP_A555_GATE] = { .word = 18, .mask = BIT(6) }, + [IMX95_OCOTP_M7_GATE] = { .word = 18, .mask = BIT(9) }, + [IMX95_OCOTP_DCSS_GATE] = { .word = 18, .mask = BIT(22) }, + [IMX95_OCOTP_LVDS1_GATE] = { .word = 18, .mask = BIT(27) }, + [IMX95_OCOTP_ISP_GATE] = { .word = 18, .mask = BIT(29) }, + [IMX95_OCOTP_USB1_GATE] = { .word = 19, .mask = BIT(2) }, + [IMX95_OCOTP_USB2_GATE] = { .word = 19, .mask = BIT(3) }, + [IMX95_OCOTP_NETC_GATE] = { .word = 19, .mask = BIT(4) }, + [IMX95_OCOTP_PCIE1_GATE] = { .word = 19, .mask = BIT(6) }, + [IMX95_OCOTP_PCIE2_GATE] = { .word = 19, .mask = BIT(7) }, + [IMX95_OCOTP_ADC1_GATE] = { .word = 19, .mask = BIT(8) }, + [IMX95_OCOTP_EARC_RX_GATE] = { .word = 19, .mask = BIT(11) }, + [IMX95_OCOTP_GPU3D_GATE] = { .word = 19, .mask = BIT(16) }, + [IMX95_OCOTP_VPU_GATE] = { .word = 19, .mask = BIT(17) }, + [IMX95_OCOTP_JPEG_ENC_GATE] = { .word = 19, .mask = BIT(18) }, + [IMX95_OCOTP_JPEG_DEC_GATE] = { .word = 19, .mask = BIT(19) }, + [IMX95_OCOTP_MIPI_CSI1_GATE] = { .word = 19, .mask = BIT(21) }, + [IMX95_OCOTP_MIPI_CSI2_GATE] = { .word = 19, .mask = BIT(22) }, + [IMX95_OCOTP_MIPI_DSI1_GATE] = { .word = 19, .mask = BIT(23) }, +}; + +static const struct ocotp_access_gates imx95_access_gates_info = { + .num_words = 3, + .words = {17, 18, 19}, + .num_gates = ARRAY_SIZE(imx95_access_gate), + .gates = imx95_access_gate, +}; + static const struct ocotp_devtype_data imx95_ocotp_data = { + .access_gates = &imx95_access_gates_info, .reg_off = 0x8000, .reg_read = imx_ocotp_reg_read, .size = 2048, -- 2.37.1