1 // SPDX-License-Identifier: GPL-2.0-only
6 #include <linux/clk.h>
54 	struct clk *clk;  member
62 static void mtk_cec_clear_bits(struct mtk_cec *cec, unsigned int offset,  in mtk_cec_clear_bits()  argument
65 	void __iomem *reg = cec->regs + offset;  in mtk_cec_clear_bits()
73 static void mtk_cec_set_bits(struct mtk_cec *cec, unsigned int offset,  in mtk_cec_set_bits()  argument
76 	void __iomem *reg = cec->regs + offset;  in mtk_cec_set_bits()
84 static void mtk_cec_mask(struct mtk_cec *cec, unsigned int offset,  in mtk_cec_mask()  argument
87 	u32 tmp = readl(cec->regs + offset) & ~mask;  in mtk_cec_mask()
90 	writel(tmp, cec->regs + offset);  in mtk_cec_mask()
97 	struct mtk_cec *cec = dev_get_drvdata(dev);  in mtk_cec_set_hpd_event()  local
100 	spin_lock_irqsave(&cec->lock, flags);  in mtk_cec_set_hpd_event()
101 	cec->hdmi_dev = hdmi_dev;  in mtk_cec_set_hpd_event()
102 	cec->hpd_event = hpd_event;  in mtk_cec_set_hpd_event()
103 	spin_unlock_irqrestore(&cec->lock, flags);  in mtk_cec_set_hpd_event()
108 	struct mtk_cec *cec = dev_get_drvdata(dev);  in mtk_cec_hpd_high()  local
111 	status = readl(cec->regs + RX_EVENT);  in mtk_cec_hpd_high()
116 static void mtk_cec_htplg_irq_init(struct mtk_cec *cec)  in mtk_cec_htplg_irq_init()  argument
118 	mtk_cec_mask(cec, CEC_CKGEN, 0 | CEC_32K_PDN, PDN | CEC_32K_PDN);  in mtk_cec_htplg_irq_init()
119 	mtk_cec_set_bits(cec, RX_GEN_WD, HDMI_PORD_INT_32K_CLR |  in mtk_cec_htplg_irq_init()
121 	mtk_cec_mask(cec, RX_GEN_WD, 0, HDMI_PORD_INT_32K_CLR | RX_INT_32K_CLR |  in mtk_cec_htplg_irq_init()
126 static void mtk_cec_htplg_irq_enable(struct mtk_cec *cec)  in mtk_cec_htplg_irq_enable()  argument
128 	mtk_cec_set_bits(cec, RX_EVENT, HDMI_PORD_INT_EN | HDMI_HTPLG_INT_EN);  in mtk_cec_htplg_irq_enable()
131 static void mtk_cec_htplg_irq_disable(struct mtk_cec *cec)  in mtk_cec_htplg_irq_disable()  argument
133 	mtk_cec_clear_bits(cec, RX_EVENT, HDMI_PORD_INT_EN | HDMI_HTPLG_INT_EN);  in mtk_cec_htplg_irq_disable()
136 static void mtk_cec_clear_htplg_irq(struct mtk_cec *cec)  in mtk_cec_clear_htplg_irq()  argument
138 	mtk_cec_set_bits(cec, TR_CONFIG, CLEAR_CEC_IRQ);  in mtk_cec_clear_htplg_irq()
139 	mtk_cec_set_bits(cec, NORMAL_INT_CTRL, HDMI_HTPLG_INT_CLR |  in mtk_cec_clear_htplg_irq()
141 	mtk_cec_set_bits(cec, RX_GEN_WD, HDMI_PORD_INT_32K_CLR |  in mtk_cec_clear_htplg_irq()
144 	mtk_cec_clear_bits(cec, NORMAL_INT_CTRL, HDMI_HTPLG_INT_CLR |  in mtk_cec_clear_htplg_irq()
146 	mtk_cec_clear_bits(cec, TR_CONFIG, CLEAR_CEC_IRQ);  in mtk_cec_clear_htplg_irq()
147 	mtk_cec_clear_bits(cec, RX_GEN_WD, HDMI_PORD_INT_32K_CLR |  in mtk_cec_clear_htplg_irq()
151 static void mtk_cec_hpd_event(struct mtk_cec *cec, bool hpd)  in mtk_cec_hpd_event()  argument
157 	spin_lock_irqsave(&cec->lock, flags);  in mtk_cec_hpd_event()
158 	hpd_event = cec->hpd_event;  in mtk_cec_hpd_event()
159 	hdmi_dev = cec->hdmi_dev;  in mtk_cec_hpd_event()
160 	spin_unlock_irqrestore(&cec->lock, flags);  in mtk_cec_hpd_event()
169 	struct mtk_cec *cec = dev_get_drvdata(dev);  in mtk_cec_htplg_isr_thread()  local
172 	mtk_cec_clear_htplg_irq(cec);  in mtk_cec_htplg_isr_thread()
175 	if (cec->hpd != hpd) {  in mtk_cec_htplg_isr_thread()
177 			cec->hpd, hpd);  in mtk_cec_htplg_isr_thread()
178 		cec->hpd = hpd;  in mtk_cec_htplg_isr_thread()
179 		mtk_cec_hpd_event(cec, hpd);  in mtk_cec_htplg_isr_thread()
186 	struct device *dev = &pdev->dev;  in mtk_cec_probe()
187 	struct mtk_cec *cec;  in mtk_cec_probe()  local
190 	cec = devm_kzalloc(dev, sizeof(*cec), GFP_KERNEL);  in mtk_cec_probe()
191 	if (!cec)  in mtk_cec_probe()
192 		return -ENOMEM;  in mtk_cec_probe()
194 	platform_set_drvdata(pdev, cec);  in mtk_cec_probe()
195 	spin_lock_init(&cec->lock);  in mtk_cec_probe()
197 	cec->regs = devm_platform_ioremap_resource(pdev, 0);  in mtk_cec_probe()
198 	if (IS_ERR(cec->regs))  in mtk_cec_probe()
199 		return dev_err_probe(dev, PTR_ERR(cec->regs),  in mtk_cec_probe()
200 				     "Failed to ioremap cec\n");  in mtk_cec_probe()
202 	cec->clk = devm_clk_get(dev, NULL);  in mtk_cec_probe()
203 	if (IS_ERR(cec->clk))  in mtk_cec_probe()
204 		return dev_err_probe(dev, PTR_ERR(cec->clk),  in mtk_cec_probe()
205 				     "Failed to get cec clock\n");  in mtk_cec_probe()
207 	cec->irq = platform_get_irq(pdev, 0);  in mtk_cec_probe()
208 	if (cec->irq < 0)  in mtk_cec_probe()
209 		return cec->irq;  in mtk_cec_probe()
211 	ret = devm_request_threaded_irq(dev, cec->irq, NULL,  in mtk_cec_probe()
216 		return dev_err_probe(dev, ret, "Failed to register cec irq\n");  in mtk_cec_probe()
218 	ret = clk_prepare_enable(cec->clk);  in mtk_cec_probe()
220 		return dev_err_probe(dev, ret, "Failed to enable cec clock\n");  in mtk_cec_probe()
222 	mtk_cec_htplg_irq_init(cec);  in mtk_cec_probe()
223 	mtk_cec_htplg_irq_enable(cec);  in mtk_cec_probe()
230 	struct mtk_cec *cec = platform_get_drvdata(pdev);  in mtk_cec_remove()  local
232 	mtk_cec_htplg_irq_disable(cec);  in mtk_cec_remove()
233 	clk_disable_unprepare(cec->clk);  in mtk_cec_remove()
237 	{ .compatible = "mediatek,mt8173-cec", },
246 		.name = "mediatek-cec",