// SPDX-License-Identifier: GPL-2.0+ /* Copyright (c) 2018 Jernej Skrabec */ #include #include #include #include #include #include #include #include #include "sun8i_tcon_top.h" static int sun8i_tcon_top_get_connected_ep_id(struct device_node *node, int port_id) { struct device_node *ep, *remote, *port; struct of_endpoint endpoint; port = of_graph_get_port_by_id(node, port_id); if (!port) return -ENOENT; for_each_available_child_of_node(port, ep) { remote = of_graph_get_remote_port_parent(ep); if (!remote) continue; if (of_device_is_available(remote)) { of_graph_parse_endpoint(ep, &endpoint); of_node_put(remote); return endpoint.id; } of_node_put(remote); } return -ENOENT; } static struct clk_hw *sun8i_tcon_top_register_gate(struct device *dev, const char *parent, void __iomem *regs, spinlock_t *lock, u8 bit, int name_index) { const char *clk_name, *parent_name; int ret, index; index = of_property_match_string(dev->of_node, "clock-names", parent); if (index < 0) return index; parent_name = of_clk_get_parent_name(dev->of_node, index); ret = of_property_read_string_index(dev->of_node, "clock-output-names", name_index, &clk_name); if (ret) return ERR_PTR(ret); return clk_hw_register_gate(dev, clk_name, parent_name, CLK_SET_RATE_PARENT, regs + TCON_TOP_GATE_SRC_REG, bit, 0, lock); }; static int sun8i_tcon_top_bind(struct device *dev, struct device *master, void *data) { struct platform_device *pdev = to_platform_device(dev); struct clk_hw_onecell_data *clk_data; struct sun8i_tcon_top *tcon_top; bool mixer0_unused = false; struct resource *res; void __iomem *regs; int ret, i, id; u32 val; tcon_top = devm_kzalloc(dev, sizeof(*tcon_top), GFP_KERNEL); if (!tcon_top) return -ENOMEM; clk_data = devm_kzalloc(dev, sizeof(*clk_data) + sizeof(*clk_data->hws) * CLK_NUM, GFP_KERNEL); if (!clk_data) return -ENOMEM; tcon_top->clk_data = clk_data; spin_lock_init(&tcon_top->reg_lock); tcon_top->rst = devm_reset_control_get(dev, NULL); if (IS_ERR(tcon_top->rst)) { dev_err(dev, "Couldn't get our reset line\n"); return PTR_ERR(tcon_top->rst); } tcon_top->bus = devm_clk_get(dev, "bus"); if (IS_ERR(tcon_top->bus)) { dev_err(dev, "Couldn't get the bus clock\n"); return PTR_ERR(tcon_top->bus); } res = platform_get_resource(pdev, IORESOURCE_MEM, 0); regs = devm_ioremap_resource(dev, res); if (IS_ERR(regs)) return PTR_ERR(regs); ret = reset_control_deassert(tcon_top->rst); if (ret) { dev_err(dev, "Could not deassert ctrl reset control\n"); return ret; } ret = clk_prepare_enable(tcon_top->bus); if (ret) { dev_err(dev, "Could not enable bus clock\n"); goto err_assert_reset; } val = 0; /* check if HDMI mux output is connected */ if (sun8i_tcon_top_get_connected_ep_id(dev->of_node, 5) >= 0) { /* find HDMI input endpoint id, if it is connected at all*/ id = sun8i_tcon_top_get_connected_ep_id(dev->of_node, 4); if (id >= 0) val = FIELD_PREP(TCON_TOP_HDMI_SRC_MSK, id + 1); else DRM_DEBUG_DRIVER("TCON TOP HDMI input is not connected\n"); } else { DRM_DEBUG_DRIVER("TCON TOP HDMI output is not connected\n"); } writel(val, regs + TCON_TOP_GATE_SRC_REG); val = 0; /* process mixer0 mux output */ id = sun8i_tcon_top_get_connected_ep_id(dev->of_node, 1); if (id >= 0) { val = FIELD_PREP(TCON_TOP_PORT_DE0_MSK, id); } else { DRM_DEBUG_DRIVER("TCON TOP mixer0 output is not connected\n"); mixer0_unused = true; } /* process mixer1 mux output */ id = sun8i_tcon_top_get_connected_ep_id(dev->of_node, 3); if (id >= 0) { val |= FIELD_PREP(TCON_TOP_PORT_DE1_MSK, id); /* * mixer0 mux has priority over mixer1 mux. We have to * make sure mixer0 doesn't overtake TCON from mixer1. */ if (mixer0_unused && id == 0) val |= FIELD_PREP(TCON_TOP_PORT_DE0_MSK, 1); } else { DRM_DEBUG_DRIVER("TCON TOP mixer1 output is not connected\n"); } writel(val, regs + TCON_TOP_PORT_SEL_REG); /* * TCON TOP has two muxes, which select parent clock for each TCON TV * channel clock. Parent could be either TCON TV or TVE clock. For now * we leave this fixed to TCON TV, since TVE driver for R40 is not yet * implemented. Once it is, graph needs to be traversed to determine * if TVE is active on each TCON TV. If it is, mux should be switched * to TVE clock parent. */ clk_data->hws[CLK_TCON_TOP_TV0] = sun8i_tcon_top_register_gate(dev, "tcon-tv0", regs, &tcon_top->reg_lock, TCON_TOP_TCON_TV0_GATE, 0); clk_data->hws[CLK_TCON_TOP_TV1] = sun8i_tcon_top_register_gate(dev, "tcon-tv1", regs, &tcon_top->reg_lock, TCON_TOP_TCON_TV1_GATE, 1); clk_data->hws[CLK_TCON_TOP_DSI] = sun8i_tcon_top_register_gate(dev, "dsi", regs, &tcon_top->reg_lock, TCON_TOP_TCON_DSI_GATE, 2); for (i = 0; i < CLK_NUM; i++) if (IS_ERR(clk_data->hws[i])) { ret = PTR_ERR(clk_data->hws[i]); goto err_unregister_gates; } clk_data->num = CLK_NUM; ret = of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get, clk_data); if (ret) goto err_unregister_gates; dev_set_drvdata(dev, tcon_top); return 0; err_unregister_gates: for (i = 0; i < CLK_NUM; i++) if (clk_data->hws[i]) clk_hw_unregister_gate(clk_data->hws[i]); clk_disable_unprepare(tcon_top->bus); err_assert_reset: reset_control_assert(tcon_top->rst); return ret; } static void sun8i_tcon_top_unbind(struct device *dev, struct device *master, void *data) { struct sun8i_tcon_top *tcon_top = dev_get_drvdata(dev); struct clk_hw_onecell_data *clk_data = tcon_top->clk_data; int i; of_clk_del_provider(dev->of_node); for (i = 0; i < CLK_NUM; i++) clk_hw_unregister_gate(clk_data->hws[i]); clk_disable_unprepare(tcon_top->bus); reset_control_assert(tcon_top->rst); } static const struct component_ops sun8i_tcon_top_ops = { .bind = sun8i_tcon_top_bind, .unbind = sun8i_tcon_top_unbind, }; static int sun8i_tcon_top_probe(struct platform_device *pdev) { return component_add(&pdev->dev, &sun8i_tcon_top_ops); } static int sun8i_tcon_top_remove(struct platform_device *pdev) { component_del(&pdev->dev, &sun8i_tcon_top_ops); return 0; } /* sun4i_drv uses this list to check if a device node is a TCON TOP */ const struct of_device_id sun8i_tcon_top_of_table[] = { { .compatible = "allwinner,sun8i-r40-tcon-top" }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, sun8i_tcon_top_of_table); EXPORT_SYMBOL(sun8i_tcon_top_of_table); static struct platform_driver sun8i_tcon_top_platform_driver = { .probe = sun8i_tcon_top_probe, .remove = sun8i_tcon_top_remove, .driver = { .name = "sun8i-tcon-top", .of_match_table = sun8i_tcon_top_of_table, }, }; module_platform_driver(sun8i_tcon_top_platform_driver); MODULE_AUTHOR("Jernej Skrabec "); MODULE_DESCRIPTION("Allwinner R40 TCON TOP driver"); MODULE_LICENSE("GPL");