1 // SPDX-License-Identifier: GPL-2.0+
2 /* Copyright (c) 2018 Jernej Skrabec <jernej.skrabec@siol.net> */
6 #include <dt-bindings/clock/sun8i-tcon-top.h>
8 #include <linux/bitfield.h>
9 #include <linux/component.h>
10 #include <linux/device.h>
11 #include <linux/module.h>
12 #include <linux/of_graph.h>
13 #include <linux/platform_device.h>
15 #include "sun8i_tcon_top.h"
17 static bool sun8i_tcon_top_node_is_tcon_top(struct device_node *node)
19 return !!of_match_node(sun8i_tcon_top_of_table, node);
22 int sun8i_tcon_top_set_hdmi_src(struct device *dev, int tcon)
24 struct sun8i_tcon_top *tcon_top = dev_get_drvdata(dev);
28 if (!sun8i_tcon_top_node_is_tcon_top(dev->of_node)) {
29 dev_err(dev, "Device is not TCON TOP!\n");
33 if (tcon < 2 || tcon > 3) {
34 dev_err(dev, "TCON index must be 2 or 3!\n");
38 spin_lock_irqsave(&tcon_top->reg_lock, flags);
40 val = readl(tcon_top->regs + TCON_TOP_GATE_SRC_REG);
41 val &= ~TCON_TOP_HDMI_SRC_MSK;
42 val |= FIELD_PREP(TCON_TOP_HDMI_SRC_MSK, tcon - 1);
43 writel(val, tcon_top->regs + TCON_TOP_GATE_SRC_REG);
45 spin_unlock_irqrestore(&tcon_top->reg_lock, flags);
49 EXPORT_SYMBOL(sun8i_tcon_top_set_hdmi_src);
51 int sun8i_tcon_top_de_config(struct device *dev, int mixer, int tcon)
53 struct sun8i_tcon_top *tcon_top = dev_get_drvdata(dev);
57 if (!sun8i_tcon_top_node_is_tcon_top(dev->of_node)) {
58 dev_err(dev, "Device is not TCON TOP!\n");
63 dev_err(dev, "Mixer index is too high!\n");
68 dev_err(dev, "TCON index is too high!\n");
72 spin_lock_irqsave(&tcon_top->reg_lock, flags);
74 reg = readl(tcon_top->regs + TCON_TOP_PORT_SEL_REG);
76 reg &= ~TCON_TOP_PORT_DE0_MSK;
77 reg |= FIELD_PREP(TCON_TOP_PORT_DE0_MSK, tcon);
79 reg &= ~TCON_TOP_PORT_DE1_MSK;
80 reg |= FIELD_PREP(TCON_TOP_PORT_DE1_MSK, tcon);
82 writel(reg, tcon_top->regs + TCON_TOP_PORT_SEL_REG);
84 spin_unlock_irqrestore(&tcon_top->reg_lock, flags);
88 EXPORT_SYMBOL(sun8i_tcon_top_de_config);
91 static struct clk_hw *sun8i_tcon_top_register_gate(struct device *dev,
95 u8 bit, int name_index)
97 const char *clk_name, *parent_name;
100 index = of_property_match_string(dev->of_node, "clock-names", parent);
102 return ERR_PTR(index);
104 parent_name = of_clk_get_parent_name(dev->of_node, index);
106 ret = of_property_read_string_index(dev->of_node,
107 "clock-output-names", name_index,
112 return clk_hw_register_gate(dev, clk_name, parent_name,
114 regs + TCON_TOP_GATE_SRC_REG,
118 static int sun8i_tcon_top_bind(struct device *dev, struct device *master,
121 struct platform_device *pdev = to_platform_device(dev);
122 struct clk_hw_onecell_data *clk_data;
123 struct sun8i_tcon_top *tcon_top;
124 struct resource *res;
128 tcon_top = devm_kzalloc(dev, sizeof(*tcon_top), GFP_KERNEL);
132 clk_data = devm_kzalloc(dev, sizeof(*clk_data) +
133 sizeof(*clk_data->hws) * CLK_NUM,
137 tcon_top->clk_data = clk_data;
139 spin_lock_init(&tcon_top->reg_lock);
141 tcon_top->rst = devm_reset_control_get(dev, NULL);
142 if (IS_ERR(tcon_top->rst)) {
143 dev_err(dev, "Couldn't get our reset line\n");
144 return PTR_ERR(tcon_top->rst);
147 tcon_top->bus = devm_clk_get(dev, "bus");
148 if (IS_ERR(tcon_top->bus)) {
149 dev_err(dev, "Couldn't get the bus clock\n");
150 return PTR_ERR(tcon_top->bus);
153 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
154 regs = devm_ioremap_resource(dev, res);
155 tcon_top->regs = regs;
157 return PTR_ERR(regs);
159 ret = reset_control_deassert(tcon_top->rst);
161 dev_err(dev, "Could not deassert ctrl reset control\n");
165 ret = clk_prepare_enable(tcon_top->bus);
167 dev_err(dev, "Could not enable bus clock\n");
168 goto err_assert_reset;
172 * TCON TOP has two muxes, which select parent clock for each TCON TV
173 * channel clock. Parent could be either TCON TV or TVE clock. For now
174 * we leave this fixed to TCON TV, since TVE driver for R40 is not yet
175 * implemented. Once it is, graph needs to be traversed to determine
176 * if TVE is active on each TCON TV. If it is, mux should be switched
177 * to TVE clock parent.
179 clk_data->hws[CLK_TCON_TOP_TV0] =
180 sun8i_tcon_top_register_gate(dev, "tcon-tv0", regs,
182 TCON_TOP_TCON_TV0_GATE, 0);
184 clk_data->hws[CLK_TCON_TOP_TV1] =
185 sun8i_tcon_top_register_gate(dev, "tcon-tv1", regs,
187 TCON_TOP_TCON_TV1_GATE, 1);
189 clk_data->hws[CLK_TCON_TOP_DSI] =
190 sun8i_tcon_top_register_gate(dev, "dsi", regs,
192 TCON_TOP_TCON_DSI_GATE, 2);
194 for (i = 0; i < CLK_NUM; i++)
195 if (IS_ERR(clk_data->hws[i])) {
196 ret = PTR_ERR(clk_data->hws[i]);
197 goto err_unregister_gates;
200 clk_data->num = CLK_NUM;
202 ret = of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
205 goto err_unregister_gates;
207 dev_set_drvdata(dev, tcon_top);
211 err_unregister_gates:
212 for (i = 0; i < CLK_NUM; i++)
213 if (clk_data->hws[i])
214 clk_hw_unregister_gate(clk_data->hws[i]);
215 clk_disable_unprepare(tcon_top->bus);
217 reset_control_assert(tcon_top->rst);
222 static void sun8i_tcon_top_unbind(struct device *dev, struct device *master,
225 struct sun8i_tcon_top *tcon_top = dev_get_drvdata(dev);
226 struct clk_hw_onecell_data *clk_data = tcon_top->clk_data;
229 of_clk_del_provider(dev->of_node);
230 for (i = 0; i < CLK_NUM; i++)
231 clk_hw_unregister_gate(clk_data->hws[i]);
233 clk_disable_unprepare(tcon_top->bus);
234 reset_control_assert(tcon_top->rst);
237 static const struct component_ops sun8i_tcon_top_ops = {
238 .bind = sun8i_tcon_top_bind,
239 .unbind = sun8i_tcon_top_unbind,
242 static int sun8i_tcon_top_probe(struct platform_device *pdev)
244 return component_add(&pdev->dev, &sun8i_tcon_top_ops);
247 static int sun8i_tcon_top_remove(struct platform_device *pdev)
249 component_del(&pdev->dev, &sun8i_tcon_top_ops);
254 /* sun4i_drv uses this list to check if a device node is a TCON TOP */
255 const struct of_device_id sun8i_tcon_top_of_table[] = {
256 { .compatible = "allwinner,sun8i-r40-tcon-top" },
259 MODULE_DEVICE_TABLE(of, sun8i_tcon_top_of_table);
260 EXPORT_SYMBOL(sun8i_tcon_top_of_table);
262 static struct platform_driver sun8i_tcon_top_platform_driver = {
263 .probe = sun8i_tcon_top_probe,
264 .remove = sun8i_tcon_top_remove,
266 .name = "sun8i-tcon-top",
267 .of_match_table = sun8i_tcon_top_of_table,
270 module_platform_driver(sun8i_tcon_top_platform_driver);
272 MODULE_AUTHOR("Jernej Skrabec <jernej.skrabec@siol.net>");
273 MODULE_DESCRIPTION("Allwinner R40 TCON TOP driver");
274 MODULE_LICENSE("GPL");