// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2014 MediaTek Inc. * Author: Jie Qiu */ #include #include #include #include #include #include #include #include "mtk_cec.h" #define TR_CONFIG 0x00 #define CLEAR_CEC_IRQ BIT(15) #define CEC_CKGEN 0x04 #define CEC_32K_PDN BIT(19) #define PDN BIT(16) #define RX_EVENT 0x54 #define HDMI_PORD BIT(25) #define HDMI_HTPLG BIT(24) #define HDMI_PORD_INT_EN BIT(9) #define HDMI_HTPLG_INT_EN BIT(8) #define RX_GEN_WD 0x58 #define HDMI_PORD_INT_32K_STATUS BIT(26) #define RX_RISC_INT_32K_STATUS BIT(25) #define HDMI_HTPLG_INT_32K_STATUS BIT(24) #define HDMI_PORD_INT_32K_CLR BIT(18) #define RX_INT_32K_CLR BIT(17) #define HDMI_HTPLG_INT_32K_CLR BIT(16) #define HDMI_PORD_INT_32K_STA_MASK BIT(10) #define RX_RISC_INT_32K_STA_MASK BIT(9) #define HDMI_HTPLG_INT_32K_STA_MASK BIT(8) #define HDMI_PORD_INT_32K_EN BIT(2) #define RX_INT_32K_EN BIT(1) #define HDMI_HTPLG_INT_32K_EN BIT(0) #define NORMAL_INT_CTRL 0x5C #define HDMI_HTPLG_INT_STA BIT(0) #define HDMI_PORD_INT_STA BIT(1) #define HDMI_HTPLG_INT_CLR BIT(16) #define HDMI_PORD_INT_CLR BIT(17) #define HDMI_FULL_INT_CLR BIT(20) struct mtk_cec { void __iomem *regs; struct clk *clk; int irq; bool hpd; void (*hpd_event)(bool hpd, struct device *dev); struct device *hdmi_dev; spinlock_t lock; }; static void mtk_cec_clear_bits(struct mtk_cec *cec, unsigned int offset, unsigned int bits) { void __iomem *reg = cec->regs + offset; u32 tmp; tmp = readl(reg); tmp &= ~bits; writel(tmp, reg); } static void mtk_cec_set_bits(struct mtk_cec *cec, unsigned int offset, unsigned int bits) { void __iomem *reg = cec->regs + offset; u32 tmp; tmp = readl(reg); tmp |= bits; writel(tmp, reg); } static void mtk_cec_mask(struct mtk_cec *cec, unsigned int offset, unsigned int val, unsigned int mask) { u32 tmp = readl(cec->regs + offset) & ~mask; tmp |= val & mask; writel(val, cec->regs + offset); } void mtk_cec_set_hpd_event(struct device *dev, void (*hpd_event)(bool hpd, struct device *dev), struct device *hdmi_dev) { struct mtk_cec *cec = dev_get_drvdata(dev); unsigned long flags; spin_lock_irqsave(&cec->lock, flags); cec->hdmi_dev = hdmi_dev; cec->hpd_event = hpd_event; spin_unlock_irqrestore(&cec->lock, flags); } bool mtk_cec_hpd_high(struct device *dev) { struct mtk_cec *cec = dev_get_drvdata(dev); unsigned int status; status = readl(cec->regs + RX_EVENT); return (status & (HDMI_PORD | HDMI_HTPLG)) == (HDMI_PORD | HDMI_HTPLG); } static void mtk_cec_htplg_irq_init(struct mtk_cec *cec) { mtk_cec_mask(cec, CEC_CKGEN, 0 | CEC_32K_PDN, PDN | CEC_32K_PDN); mtk_cec_set_bits(cec, RX_GEN_WD, HDMI_PORD_INT_32K_CLR | RX_INT_32K_CLR | HDMI_HTPLG_INT_32K_CLR); mtk_cec_mask(cec, RX_GEN_WD, 0, HDMI_PORD_INT_32K_CLR | RX_INT_32K_CLR | HDMI_HTPLG_INT_32K_CLR | HDMI_PORD_INT_32K_EN | RX_INT_32K_EN | HDMI_HTPLG_INT_32K_EN); } static void mtk_cec_htplg_irq_enable(struct mtk_cec *cec) { mtk_cec_set_bits(cec, RX_EVENT, HDMI_PORD_INT_EN | HDMI_HTPLG_INT_EN); } static void mtk_cec_htplg_irq_disable(struct mtk_cec *cec) { mtk_cec_clear_bits(cec, RX_EVENT, HDMI_PORD_INT_EN | HDMI_HTPLG_INT_EN); } static void mtk_cec_clear_htplg_irq(struct mtk_cec *cec) { mtk_cec_set_bits(cec, TR_CONFIG, CLEAR_CEC_IRQ); mtk_cec_set_bits(cec, NORMAL_INT_CTRL, HDMI_HTPLG_INT_CLR | HDMI_PORD_INT_CLR | HDMI_FULL_INT_CLR); mtk_cec_set_bits(cec, RX_GEN_WD, HDMI_PORD_INT_32K_CLR | RX_INT_32K_CLR | HDMI_HTPLG_INT_32K_CLR); usleep_range(5, 10); mtk_cec_clear_bits(cec, NORMAL_INT_CTRL, HDMI_HTPLG_INT_CLR | HDMI_PORD_INT_CLR | HDMI_FULL_INT_CLR); mtk_cec_clear_bits(cec, TR_CONFIG, CLEAR_CEC_IRQ); mtk_cec_clear_bits(cec, RX_GEN_WD, HDMI_PORD_INT_32K_CLR | RX_INT_32K_CLR | HDMI_HTPLG_INT_32K_CLR); } static void mtk_cec_hpd_event(struct mtk_cec *cec, bool hpd) { void (*hpd_event)(bool hpd, struct device *dev); struct device *hdmi_dev; unsigned long flags; spin_lock_irqsave(&cec->lock, flags); hpd_event = cec->hpd_event; hdmi_dev = cec->hdmi_dev; spin_unlock_irqrestore(&cec->lock, flags); if (hpd_event) hpd_event(hpd, hdmi_dev); } static irqreturn_t mtk_cec_htplg_isr_thread(int irq, void *arg) { struct device *dev = arg; struct mtk_cec *cec = dev_get_drvdata(dev); bool hpd; mtk_cec_clear_htplg_irq(cec); hpd = mtk_cec_hpd_high(dev); if (cec->hpd != hpd) { dev_dbg(dev, "hotplug event! cur hpd = %d, hpd = %d\n", cec->hpd, hpd); cec->hpd = hpd; mtk_cec_hpd_event(cec, hpd); } return IRQ_HANDLED; } static int mtk_cec_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct mtk_cec *cec; struct resource *res; int ret; cec = devm_kzalloc(dev, sizeof(*cec), GFP_KERNEL); if (!cec) return -ENOMEM; platform_set_drvdata(pdev, cec); spin_lock_init(&cec->lock); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); cec->regs = devm_ioremap_resource(dev, res); if (IS_ERR(cec->regs)) { ret = PTR_ERR(cec->regs); dev_err(dev, "Failed to ioremap cec: %d\n", ret); return ret; } cec->clk = devm_clk_get(dev, NULL); if (IS_ERR(cec->clk)) { ret = PTR_ERR(cec->clk); dev_err(dev, "Failed to get cec clock: %d\n", ret); return ret; } cec->irq = platform_get_irq(pdev, 0); if (cec->irq < 0) return cec->irq; ret = devm_request_threaded_irq(dev, cec->irq, NULL, mtk_cec_htplg_isr_thread, IRQF_SHARED | IRQF_TRIGGER_LOW | IRQF_ONESHOT, "hdmi hpd", dev); if (ret) { dev_err(dev, "Failed to register cec irq: %d\n", ret); return ret; } ret = clk_prepare_enable(cec->clk); if (ret) { dev_err(dev, "Failed to enable cec clock: %d\n", ret); return ret; } mtk_cec_htplg_irq_init(cec); mtk_cec_htplg_irq_enable(cec); return 0; } static int mtk_cec_remove(struct platform_device *pdev) { struct mtk_cec *cec = platform_get_drvdata(pdev); mtk_cec_htplg_irq_disable(cec); clk_disable_unprepare(cec->clk); return 0; } static const struct of_device_id mtk_cec_of_ids[] = { { .compatible = "mediatek,mt8173-cec", }, {} }; MODULE_DEVICE_TABLE(of, mtk_cec_of_ids); struct platform_driver mtk_cec_driver = { .probe = mtk_cec_probe, .remove = mtk_cec_remove, .driver = { .name = "mediatek-cec", .of_match_table = mtk_cec_of_ids, }, };