// SPDX-License-Identifier: GPL-2.0+ /* * Copyright 2021 Pengutronix, Lucas Stach */ #include #include #include #include #include #include #include #include #include #include #include #include #define BLK_SFT_RSTN 0x0 #define BLK_CLK_EN 0x4 #define BLK_MIPI_RESET_DIV 0x8 /* Mini/Nano/Plus DISPLAY_BLK_CTRL only */ struct imx8m_blk_ctrl_domain; struct imx8m_blk_ctrl { struct device *dev; struct notifier_block power_nb; struct device *bus_power_dev; struct regmap *regmap; struct imx8m_blk_ctrl_domain *domains; struct genpd_onecell_data onecell_data; }; struct imx8m_blk_ctrl_domain_data { const char *name; const char * const *clk_names; int num_clks; const char *gpc_name; u32 rst_mask; u32 clk_mask; /* * i.MX8M Mini, Nano and Plus have a third DISPLAY_BLK_CTRL register * which is used to control the reset for the MIPI Phy. * Since it's only present in certain circumstances, * an if-statement should be used before setting and clearing this * register. */ u32 mipi_phy_rst_mask; }; #define DOMAIN_MAX_CLKS 4 struct imx8m_blk_ctrl_domain { struct generic_pm_domain genpd; const struct imx8m_blk_ctrl_domain_data *data; struct clk_bulk_data clks[DOMAIN_MAX_CLKS]; struct device *power_dev; struct imx8m_blk_ctrl *bc; }; struct imx8m_blk_ctrl_data { int max_reg; notifier_fn_t power_notifier_fn; const struct imx8m_blk_ctrl_domain_data *domains; int num_domains; }; static inline struct imx8m_blk_ctrl_domain * to_imx8m_blk_ctrl_domain(struct generic_pm_domain *genpd) { return container_of(genpd, struct imx8m_blk_ctrl_domain, genpd); } static int imx8m_blk_ctrl_power_on(struct generic_pm_domain *genpd) { struct imx8m_blk_ctrl_domain *domain = to_imx8m_blk_ctrl_domain(genpd); const struct imx8m_blk_ctrl_domain_data *data = domain->data; struct imx8m_blk_ctrl *bc = domain->bc; int ret; /* make sure bus domain is awake */ ret = pm_runtime_get_sync(bc->bus_power_dev); if (ret < 0) { pm_runtime_put_noidle(bc->bus_power_dev); dev_err(bc->dev, "failed to power up bus domain\n"); return ret; } /* put devices into reset */ regmap_clear_bits(bc->regmap, BLK_SFT_RSTN, data->rst_mask); if (data->mipi_phy_rst_mask) regmap_clear_bits(bc->regmap, BLK_MIPI_RESET_DIV, data->mipi_phy_rst_mask); /* enable upstream and blk-ctrl clocks to allow reset to propagate */ ret = clk_bulk_prepare_enable(data->num_clks, domain->clks); if (ret) { dev_err(bc->dev, "failed to enable clocks\n"); goto bus_put; } regmap_set_bits(bc->regmap, BLK_CLK_EN, data->clk_mask); /* power up upstream GPC domain */ ret = pm_runtime_get_sync(domain->power_dev); if (ret < 0) { dev_err(bc->dev, "failed to power up peripheral domain\n"); goto clk_disable; } /* wait for reset to propagate */ udelay(5); /* release reset */ regmap_set_bits(bc->regmap, BLK_SFT_RSTN, data->rst_mask); if (data->mipi_phy_rst_mask) regmap_set_bits(bc->regmap, BLK_MIPI_RESET_DIV, data->mipi_phy_rst_mask); /* disable upstream clocks */ clk_bulk_disable_unprepare(data->num_clks, domain->clks); return 0; clk_disable: clk_bulk_disable_unprepare(data->num_clks, domain->clks); bus_put: pm_runtime_put(bc->bus_power_dev); return ret; } static int imx8m_blk_ctrl_power_off(struct generic_pm_domain *genpd) { struct imx8m_blk_ctrl_domain *domain = to_imx8m_blk_ctrl_domain(genpd); const struct imx8m_blk_ctrl_domain_data *data = domain->data; struct imx8m_blk_ctrl *bc = domain->bc; /* put devices into reset and disable clocks */ if (data->mipi_phy_rst_mask) regmap_clear_bits(bc->regmap, BLK_MIPI_RESET_DIV, data->mipi_phy_rst_mask); regmap_clear_bits(bc->regmap, BLK_SFT_RSTN, data->rst_mask); regmap_clear_bits(bc->regmap, BLK_CLK_EN, data->clk_mask); /* power down upstream GPC domain */ pm_runtime_put(domain->power_dev); /* allow bus domain to suspend */ pm_runtime_put(bc->bus_power_dev); return 0; } static struct generic_pm_domain * imx8m_blk_ctrl_xlate(struct of_phandle_args *args, void *data) { struct genpd_onecell_data *onecell_data = data; unsigned int index = args->args[0]; if (args->args_count != 1 || index >= onecell_data->num_domains) return ERR_PTR(-EINVAL); return onecell_data->domains[index]; } static struct lock_class_key blk_ctrl_genpd_lock_class; static int imx8m_blk_ctrl_probe(struct platform_device *pdev) { const struct imx8m_blk_ctrl_data *bc_data; struct device *dev = &pdev->dev; struct imx8m_blk_ctrl *bc; void __iomem *base; int i, ret; struct regmap_config regmap_config = { .reg_bits = 32, .val_bits = 32, .reg_stride = 4, }; bc = devm_kzalloc(dev, sizeof(*bc), GFP_KERNEL); if (!bc) return -ENOMEM; bc->dev = dev; bc_data = of_device_get_match_data(dev); base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(base)) return PTR_ERR(base); regmap_config.max_register = bc_data->max_reg; bc->regmap = devm_regmap_init_mmio(dev, base, ®map_config); if (IS_ERR(bc->regmap)) return dev_err_probe(dev, PTR_ERR(bc->regmap), "failed to init regmap\n"); bc->domains = devm_kcalloc(dev, bc_data->num_domains, sizeof(struct imx8m_blk_ctrl_domain), GFP_KERNEL); if (!bc->domains) return -ENOMEM; bc->onecell_data.num_domains = bc_data->num_domains; bc->onecell_data.xlate = imx8m_blk_ctrl_xlate; bc->onecell_data.domains = devm_kcalloc(dev, bc_data->num_domains, sizeof(struct generic_pm_domain *), GFP_KERNEL); if (!bc->onecell_data.domains) return -ENOMEM; bc->bus_power_dev = genpd_dev_pm_attach_by_name(dev, "bus"); if (IS_ERR(bc->bus_power_dev)) return dev_err_probe(dev, PTR_ERR(bc->bus_power_dev), "failed to attach power domain\n"); for (i = 0; i < bc_data->num_domains; i++) { const struct imx8m_blk_ctrl_domain_data *data = &bc_data->domains[i]; struct imx8m_blk_ctrl_domain *domain = &bc->domains[i]; int j; domain->data = data; for (j = 0; j < data->num_clks; j++) domain->clks[j].id = data->clk_names[j]; ret = devm_clk_bulk_get(dev, data->num_clks, domain->clks); if (ret) { dev_err_probe(dev, ret, "failed to get clock\n"); goto cleanup_pds; } domain->power_dev = dev_pm_domain_attach_by_name(dev, data->gpc_name); if (IS_ERR(domain->power_dev)) { dev_err_probe(dev, PTR_ERR(domain->power_dev), "failed to attach power domain\n"); ret = PTR_ERR(domain->power_dev); goto cleanup_pds; } dev_set_name(domain->power_dev, "%s", data->name); domain->genpd.name = data->name; domain->genpd.power_on = imx8m_blk_ctrl_power_on; domain->genpd.power_off = imx8m_blk_ctrl_power_off; domain->bc = bc; ret = pm_genpd_init(&domain->genpd, NULL, true); if (ret) { dev_err_probe(dev, ret, "failed to init power domain\n"); dev_pm_domain_detach(domain->power_dev, true); goto cleanup_pds; } /* * We use runtime PM to trigger power on/off of the upstream GPC * domain, as a strict hierarchical parent/child power domain * setup doesn't allow us to meet the sequencing requirements. * This means we have nested locking of genpd locks, without the * nesting being visible at the genpd level, so we need a * separate lock class to make lockdep aware of the fact that * this are separate domain locks that can be nested without a * self-deadlock. */ lockdep_set_class(&domain->genpd.mlock, &blk_ctrl_genpd_lock_class); bc->onecell_data.domains[i] = &domain->genpd; } ret = of_genpd_add_provider_onecell(dev->of_node, &bc->onecell_data); if (ret) { dev_err_probe(dev, ret, "failed to add power domain provider\n"); goto cleanup_pds; } bc->power_nb.notifier_call = bc_data->power_notifier_fn; ret = dev_pm_genpd_add_notifier(bc->bus_power_dev, &bc->power_nb); if (ret) { dev_err_probe(dev, ret, "failed to add power notifier\n"); goto cleanup_provider; } dev_set_drvdata(dev, bc); return 0; cleanup_provider: of_genpd_del_provider(dev->of_node); cleanup_pds: for (i--; i >= 0; i--) { pm_genpd_remove(&bc->domains[i].genpd); dev_pm_domain_detach(bc->domains[i].power_dev, true); } dev_pm_domain_detach(bc->bus_power_dev, true); return ret; } static int imx8m_blk_ctrl_remove(struct platform_device *pdev) { struct imx8m_blk_ctrl *bc = dev_get_drvdata(&pdev->dev); int i; of_genpd_del_provider(pdev->dev.of_node); for (i = 0; bc->onecell_data.num_domains; i++) { struct imx8m_blk_ctrl_domain *domain = &bc->domains[i]; pm_genpd_remove(&domain->genpd); dev_pm_domain_detach(domain->power_dev, true); } dev_pm_genpd_remove_notifier(bc->bus_power_dev); dev_pm_domain_detach(bc->bus_power_dev, true); return 0; } #ifdef CONFIG_PM_SLEEP static int imx8m_blk_ctrl_suspend(struct device *dev) { struct imx8m_blk_ctrl *bc = dev_get_drvdata(dev); int ret, i; /* * This may look strange, but is done so the generic PM_SLEEP code * can power down our domains and more importantly power them up again * after resume, without tripping over our usage of runtime PM to * control the upstream GPC domains. Things happen in the right order * in the system suspend/resume paths due to the device parent/child * hierarchy. */ ret = pm_runtime_get_sync(bc->bus_power_dev); if (ret < 0) { pm_runtime_put_noidle(bc->bus_power_dev); return ret; } for (i = 0; i < bc->onecell_data.num_domains; i++) { struct imx8m_blk_ctrl_domain *domain = &bc->domains[i]; ret = pm_runtime_get_sync(domain->power_dev); if (ret < 0) { pm_runtime_put_noidle(domain->power_dev); goto out_fail; } } return 0; out_fail: for (i--; i >= 0; i--) pm_runtime_put(bc->domains[i].power_dev); pm_runtime_put(bc->bus_power_dev); return ret; } static int imx8m_blk_ctrl_resume(struct device *dev) { struct imx8m_blk_ctrl *bc = dev_get_drvdata(dev); int i; for (i = 0; i < bc->onecell_data.num_domains; i++) pm_runtime_put(bc->domains[i].power_dev); pm_runtime_put(bc->bus_power_dev); return 0; } #endif static const struct dev_pm_ops imx8m_blk_ctrl_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(imx8m_blk_ctrl_suspend, imx8m_blk_ctrl_resume) }; static int imx8mm_vpu_power_notifier(struct notifier_block *nb, unsigned long action, void *data) { struct imx8m_blk_ctrl *bc = container_of(nb, struct imx8m_blk_ctrl, power_nb); if (action != GENPD_NOTIFY_ON && action != GENPD_NOTIFY_PRE_OFF) return NOTIFY_OK; /* * The ADB in the VPUMIX domain has no separate reset and clock * enable bits, but is ungated together with the VPU clocks. To * allow the handshake with the GPC to progress we put the VPUs * in reset and ungate the clocks. */ regmap_clear_bits(bc->regmap, BLK_SFT_RSTN, BIT(0) | BIT(1) | BIT(2)); regmap_set_bits(bc->regmap, BLK_CLK_EN, BIT(0) | BIT(1) | BIT(2)); if (action == GENPD_NOTIFY_ON) { /* * On power up we have no software backchannel to the GPC to * wait for the ADB handshake to happen, so we just delay for a * bit. On power down the GPC driver waits for the handshake. */ udelay(5); /* set "fuse" bits to enable the VPUs */ regmap_set_bits(bc->regmap, 0x8, 0xffffffff); regmap_set_bits(bc->regmap, 0xc, 0xffffffff); regmap_set_bits(bc->regmap, 0x10, 0xffffffff); regmap_set_bits(bc->regmap, 0x14, 0xffffffff); } return NOTIFY_OK; } static const struct imx8m_blk_ctrl_domain_data imx8mm_vpu_blk_ctl_domain_data[] = { [IMX8MM_VPUBLK_PD_G1] = { .name = "vpublk-g1", .clk_names = (const char *[]){ "g1", }, .num_clks = 1, .gpc_name = "g1", .rst_mask = BIT(1), .clk_mask = BIT(1), }, [IMX8MM_VPUBLK_PD_G2] = { .name = "vpublk-g2", .clk_names = (const char *[]){ "g2", }, .num_clks = 1, .gpc_name = "g2", .rst_mask = BIT(0), .clk_mask = BIT(0), }, [IMX8MM_VPUBLK_PD_H1] = { .name = "vpublk-h1", .clk_names = (const char *[]){ "h1", }, .num_clks = 1, .gpc_name = "h1", .rst_mask = BIT(2), .clk_mask = BIT(2), }, }; static const struct imx8m_blk_ctrl_data imx8mm_vpu_blk_ctl_dev_data = { .max_reg = 0x18, .power_notifier_fn = imx8mm_vpu_power_notifier, .domains = imx8mm_vpu_blk_ctl_domain_data, .num_domains = ARRAY_SIZE(imx8mm_vpu_blk_ctl_domain_data), }; static int imx8mm_disp_power_notifier(struct notifier_block *nb, unsigned long action, void *data) { struct imx8m_blk_ctrl *bc = container_of(nb, struct imx8m_blk_ctrl, power_nb); if (action != GENPD_NOTIFY_ON && action != GENPD_NOTIFY_PRE_OFF) return NOTIFY_OK; /* Enable bus clock and deassert bus reset */ regmap_set_bits(bc->regmap, BLK_CLK_EN, BIT(12)); regmap_set_bits(bc->regmap, BLK_SFT_RSTN, BIT(6)); /* * On power up we have no software backchannel to the GPC to * wait for the ADB handshake to happen, so we just delay for a * bit. On power down the GPC driver waits for the handshake. */ if (action == GENPD_NOTIFY_ON) udelay(5); return NOTIFY_OK; } static const struct imx8m_blk_ctrl_domain_data imx8mm_disp_blk_ctl_domain_data[] = { [IMX8MM_DISPBLK_PD_CSI_BRIDGE] = { .name = "dispblk-csi-bridge", .clk_names = (const char *[]){ "csi-bridge-axi", "csi-bridge-apb", "csi-bridge-core", }, .num_clks = 3, .gpc_name = "csi-bridge", .rst_mask = BIT(0) | BIT(1) | BIT(2), .clk_mask = BIT(0) | BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(5), }, [IMX8MM_DISPBLK_PD_LCDIF] = { .name = "dispblk-lcdif", .clk_names = (const char *[]){ "lcdif-axi", "lcdif-apb", "lcdif-pix", }, .num_clks = 3, .gpc_name = "lcdif", .clk_mask = BIT(6) | BIT(7), }, [IMX8MM_DISPBLK_PD_MIPI_DSI] = { .name = "dispblk-mipi-dsi", .clk_names = (const char *[]){ "dsi-pclk", "dsi-ref", }, .num_clks = 2, .gpc_name = "mipi-dsi", .rst_mask = BIT(5), .clk_mask = BIT(8) | BIT(9), .mipi_phy_rst_mask = BIT(17), }, [IMX8MM_DISPBLK_PD_MIPI_CSI] = { .name = "dispblk-mipi-csi", .clk_names = (const char *[]){ "csi-aclk", "csi-pclk" }, .num_clks = 2, .gpc_name = "mipi-csi", .rst_mask = BIT(3) | BIT(4), .clk_mask = BIT(10) | BIT(11), .mipi_phy_rst_mask = BIT(16), }, }; static const struct imx8m_blk_ctrl_data imx8mm_disp_blk_ctl_dev_data = { .max_reg = 0x2c, .power_notifier_fn = imx8mm_disp_power_notifier, .domains = imx8mm_disp_blk_ctl_domain_data, .num_domains = ARRAY_SIZE(imx8mm_disp_blk_ctl_domain_data), }; static int imx8mn_disp_power_notifier(struct notifier_block *nb, unsigned long action, void *data) { struct imx8m_blk_ctrl *bc = container_of(nb, struct imx8m_blk_ctrl, power_nb); if (action != GENPD_NOTIFY_ON && action != GENPD_NOTIFY_PRE_OFF) return NOTIFY_OK; /* Enable bus clock and deassert bus reset */ regmap_set_bits(bc->regmap, BLK_CLK_EN, BIT(8)); regmap_set_bits(bc->regmap, BLK_SFT_RSTN, BIT(8)); /* * On power up we have no software backchannel to the GPC to * wait for the ADB handshake to happen, so we just delay for a * bit. On power down the GPC driver waits for the handshake. */ if (action == GENPD_NOTIFY_ON) udelay(5); return NOTIFY_OK; } static const struct imx8m_blk_ctrl_domain_data imx8mn_disp_blk_ctl_domain_data[] = { [IMX8MN_DISPBLK_PD_MIPI_DSI] = { .name = "dispblk-mipi-dsi", .clk_names = (const char *[]){ "dsi-pclk", "dsi-ref", }, .num_clks = 2, .gpc_name = "mipi-dsi", .rst_mask = BIT(0) | BIT(1), .clk_mask = BIT(0) | BIT(1), .mipi_phy_rst_mask = BIT(17), }, [IMX8MN_DISPBLK_PD_MIPI_CSI] = { .name = "dispblk-mipi-csi", .clk_names = (const char *[]){ "csi-aclk", "csi-pclk" }, .num_clks = 2, .gpc_name = "mipi-csi", .rst_mask = BIT(2) | BIT(3), .clk_mask = BIT(2) | BIT(3), .mipi_phy_rst_mask = BIT(16), }, [IMX8MN_DISPBLK_PD_LCDIF] = { .name = "dispblk-lcdif", .clk_names = (const char *[]){ "lcdif-axi", "lcdif-apb", "lcdif-pix", }, .num_clks = 3, .gpc_name = "lcdif", .rst_mask = BIT(4) | BIT(5), .clk_mask = BIT(4) | BIT(5), }, [IMX8MN_DISPBLK_PD_ISI] = { .name = "dispblk-isi", .clk_names = (const char *[]){ "disp_axi", "disp_apb", "disp_axi_root", "disp_apb_root"}, .num_clks = 4, .gpc_name = "isi", .rst_mask = BIT(6) | BIT(7), .clk_mask = BIT(6) | BIT(7), }, }; static const struct imx8m_blk_ctrl_data imx8mn_disp_blk_ctl_dev_data = { .max_reg = 0x84, .power_notifier_fn = imx8mn_disp_power_notifier, .domains = imx8mn_disp_blk_ctl_domain_data, .num_domains = ARRAY_SIZE(imx8mn_disp_blk_ctl_domain_data), }; static int imx8mp_media_power_notifier(struct notifier_block *nb, unsigned long action, void *data) { struct imx8m_blk_ctrl *bc = container_of(nb, struct imx8m_blk_ctrl, power_nb); if (action != GENPD_NOTIFY_ON && action != GENPD_NOTIFY_PRE_OFF) return NOTIFY_OK; /* Enable bus clock and deassert bus reset */ regmap_set_bits(bc->regmap, BLK_CLK_EN, BIT(8)); regmap_set_bits(bc->regmap, BLK_SFT_RSTN, BIT(8)); /* * On power up we have no software backchannel to the GPC to * wait for the ADB handshake to happen, so we just delay for a * bit. On power down the GPC driver waits for the handshake. */ if (action == GENPD_NOTIFY_ON) udelay(5); return NOTIFY_OK; } /* * From i.MX 8M Plus Applications Processor Reference Manual, Rev. 1, * section 13.2.2, 13.2.3 * isp-ahb and dwe are not in Figure 13-5. Media BLK_CTRL Clocks */ static const struct imx8m_blk_ctrl_domain_data imx8mp_media_blk_ctl_domain_data[] = { [IMX8MP_MEDIABLK_PD_MIPI_DSI_1] = { .name = "mediablk-mipi-dsi-1", .clk_names = (const char *[]){ "apb", "phy", }, .num_clks = 2, .gpc_name = "mipi-dsi1", .rst_mask = BIT(0) | BIT(1), .clk_mask = BIT(0) | BIT(1), .mipi_phy_rst_mask = BIT(17), }, [IMX8MP_MEDIABLK_PD_MIPI_CSI2_1] = { .name = "mediablk-mipi-csi2-1", .clk_names = (const char *[]){ "apb", "cam1" }, .num_clks = 2, .gpc_name = "mipi-csi1", .rst_mask = BIT(2) | BIT(3), .clk_mask = BIT(2) | BIT(3), .mipi_phy_rst_mask = BIT(16), }, [IMX8MP_MEDIABLK_PD_LCDIF_1] = { .name = "mediablk-lcdif-1", .clk_names = (const char *[]){ "disp1", "apb", "axi", }, .num_clks = 3, .gpc_name = "lcdif1", .rst_mask = BIT(4) | BIT(5) | BIT(23), .clk_mask = BIT(4) | BIT(5) | BIT(23), }, [IMX8MP_MEDIABLK_PD_ISI] = { .name = "mediablk-isi", .clk_names = (const char *[]){ "axi", "apb" }, .num_clks = 2, .gpc_name = "isi", .rst_mask = BIT(6) | BIT(7), .clk_mask = BIT(6) | BIT(7), }, [IMX8MP_MEDIABLK_PD_MIPI_CSI2_2] = { .name = "mediablk-mipi-csi2-2", .clk_names = (const char *[]){ "apb", "cam2" }, .num_clks = 2, .gpc_name = "mipi-csi2", .rst_mask = BIT(9) | BIT(10), .clk_mask = BIT(9) | BIT(10), .mipi_phy_rst_mask = BIT(30), }, [IMX8MP_MEDIABLK_PD_LCDIF_2] = { .name = "mediablk-lcdif-2", .clk_names = (const char *[]){ "disp2", "apb", "axi", }, .num_clks = 3, .gpc_name = "lcdif2", .rst_mask = BIT(11) | BIT(12) | BIT(24), .clk_mask = BIT(11) | BIT(12) | BIT(24), }, [IMX8MP_MEDIABLK_PD_ISP] = { .name = "mediablk-isp", .clk_names = (const char *[]){ "isp", "axi", "apb" }, .num_clks = 3, .gpc_name = "isp", .rst_mask = BIT(16) | BIT(17) | BIT(18), .clk_mask = BIT(16) | BIT(17) | BIT(18), }, [IMX8MP_MEDIABLK_PD_DWE] = { .name = "mediablk-dwe", .clk_names = (const char *[]){ "axi", "apb" }, .num_clks = 2, .gpc_name = "dwe", .rst_mask = BIT(19) | BIT(20) | BIT(21), .clk_mask = BIT(19) | BIT(20) | BIT(21), }, [IMX8MP_MEDIABLK_PD_MIPI_DSI_2] = { .name = "mediablk-mipi-dsi-2", .clk_names = (const char *[]){ "phy", }, .num_clks = 1, .gpc_name = "mipi-dsi2", .rst_mask = BIT(22), .clk_mask = BIT(22), .mipi_phy_rst_mask = BIT(29), }, }; static const struct imx8m_blk_ctrl_data imx8mp_media_blk_ctl_dev_data = { .max_reg = 0x138, .power_notifier_fn = imx8mp_media_power_notifier, .domains = imx8mp_media_blk_ctl_domain_data, .num_domains = ARRAY_SIZE(imx8mp_media_blk_ctl_domain_data), }; static int imx8mq_vpu_power_notifier(struct notifier_block *nb, unsigned long action, void *data) { struct imx8m_blk_ctrl *bc = container_of(nb, struct imx8m_blk_ctrl, power_nb); if (action != GENPD_NOTIFY_ON && action != GENPD_NOTIFY_PRE_OFF) return NOTIFY_OK; /* * The ADB in the VPUMIX domain has no separate reset and clock * enable bits, but is ungated and reset together with the VPUs. The * reset and clock enable inputs to the ADB is a logical OR of the * VPU bits. In order to set the G2 fuse bits, the G2 clock must * also be enabled. */ regmap_set_bits(bc->regmap, BLK_SFT_RSTN, BIT(0) | BIT(1)); regmap_set_bits(bc->regmap, BLK_CLK_EN, BIT(0) | BIT(1)); if (action == GENPD_NOTIFY_ON) { /* * On power up we have no software backchannel to the GPC to * wait for the ADB handshake to happen, so we just delay for a * bit. On power down the GPC driver waits for the handshake. */ udelay(5); /* set "fuse" bits to enable the VPUs */ regmap_set_bits(bc->regmap, 0x8, 0xffffffff); regmap_set_bits(bc->regmap, 0xc, 0xffffffff); regmap_set_bits(bc->regmap, 0x10, 0xffffffff); } return NOTIFY_OK; } static const struct imx8m_blk_ctrl_domain_data imx8mq_vpu_blk_ctl_domain_data[] = { [IMX8MQ_VPUBLK_PD_G1] = { .name = "vpublk-g1", .clk_names = (const char *[]){ "g1", }, .num_clks = 1, .gpc_name = "g1", .rst_mask = BIT(1), .clk_mask = BIT(1), }, [IMX8MQ_VPUBLK_PD_G2] = { .name = "vpublk-g2", .clk_names = (const char *[]){ "g2", }, .num_clks = 1, .gpc_name = "g2", .rst_mask = BIT(0), .clk_mask = BIT(0), }, }; static const struct imx8m_blk_ctrl_data imx8mq_vpu_blk_ctl_dev_data = { .max_reg = 0x14, .power_notifier_fn = imx8mq_vpu_power_notifier, .domains = imx8mq_vpu_blk_ctl_domain_data, .num_domains = ARRAY_SIZE(imx8mq_vpu_blk_ctl_domain_data), }; static const struct of_device_id imx8m_blk_ctrl_of_match[] = { { .compatible = "fsl,imx8mm-vpu-blk-ctrl", .data = &imx8mm_vpu_blk_ctl_dev_data }, { .compatible = "fsl,imx8mm-disp-blk-ctrl", .data = &imx8mm_disp_blk_ctl_dev_data }, { .compatible = "fsl,imx8mn-disp-blk-ctrl", .data = &imx8mn_disp_blk_ctl_dev_data }, { .compatible = "fsl,imx8mp-media-blk-ctrl", .data = &imx8mp_media_blk_ctl_dev_data }, { .compatible = "fsl,imx8mq-vpu-blk-ctrl", .data = &imx8mq_vpu_blk_ctl_dev_data }, { /* Sentinel */ } }; MODULE_DEVICE_TABLE(of, imx8m_blk_ctrl_of_match); static struct platform_driver imx8m_blk_ctrl_driver = { .probe = imx8m_blk_ctrl_probe, .remove = imx8m_blk_ctrl_remove, .driver = { .name = "imx8m-blk-ctrl", .pm = &imx8m_blk_ctrl_pm_ops, .of_match_table = imx8m_blk_ctrl_of_match, }, }; module_platform_driver(imx8m_blk_ctrl_driver);