Hi Russell,


On 30-05-2017 15:23, Russell King wrote:

Synopsis -> Synopsys

I rather like the format HDMI_{REGISTER_NAME}_{FIELD_NAME} so
that it clearly identifies this is a internal driver register and
not a CEC core register, but I guess its up to you :)

+
+	HDMI_CEC_MASK		= 0x7d02,
+	HDMI_CEC_POLARITY	= 0x7d03,
+	HDMI_CEC_INT		= 0x7d04,
+	HDMI_CEC_ADDR_L		= 0x7d05,
+	HDMI_CEC_ADDR_H		= 0x7d06,
+	HDMI_CEC_TX_CNT		= 0x7d07,
+	HDMI_CEC_RX_CNT		= 0x7d08,
+	HDMI_CEC_TX_DATA0	= 0x7d10,
+	HDMI_CEC_RX_DATA0	= 0x7d20,
+	HDMI_CEC_LOCK		= 0x7d30,
+	HDMI_CEC_WKUPCTRL	= 0x7d31,
+};
+
+struct dw_hdmi_cec {
+	struct dw_hdmi *hdmi;
+	const struct dw_hdmi_cec_ops *ops;
+	u32 addresses;
+	struct cec_adapter *adap;
+	struct cec_msg rx_msg;
+	unsigned int tx_status;
+	bool tx_done;
+	bool rx_done;
+	struct cec_notifier *notify;
+	int retries;
+	int irq;
+};
+
+static void dw_hdmi_write(struct dw_hdmi_cec *cec, u8 val, int offset)
+{
+	cec->ops->write(cec->hdmi, val, offset);
+}
+
+static u8 dw_hdmi_read(struct dw_hdmi_cec *cec, int offset)
+{
+	return cec->ops->read(cec->hdmi, offset);
+}
+
+static int dw_hdmi_cec_log_addr(struct cec_adapter *adap, u8 logical_addr)
+{
+	struct dw_hdmi_cec *cec = adap->priv;

You can use "cec = cec_get_drvdata(adap)" here, as in the rest of
the code.

+	u32 addresses;
+
+	if (logical_addr == CEC_LOG_ADDR_INVALID)
+		addresses = cec->addresses = 0;
+	else
+		addresses = cec->addresses |= BIT(logical_addr) | BIT(15);
+
+	dw_hdmi_write(cec, addresses & 255, HDMI_CEC_ADDR_L);
+	dw_hdmi_write(cec, addresses >> 8, HDMI_CEC_ADDR_H);
+
+	return 0;
+}
+
+static int dw_hdmi_cec_transmit(struct cec_adapter *adap, u8 attempts,
+				u32 signal_free_time, struct cec_msg *msg)
+{
+	struct dw_hdmi_cec *cec = adap->priv;
+	unsigned i;
+
+	cec->retries = attempts;

I think you should check first if CEC engine is in normal
operation mode, as a safety measure.

+
+	for (i = 0; i < msg->len; i++)
+		dw_hdmi_write(cec, msg->msg[i], HDMI_CEC_TX_DATA0 + i);
+
+	dw_hdmi_write(cec, msg->len, HDMI_CEC_TX_CNT);
+	dw_hdmi_write(cec, CEC_CTRL_NORMAL | CEC_CTRL_START, HDMI_CEC_CTRL);
+
+	return 0;
+}
+
+static irqreturn_t dw_hdmi_cec_hardirq(int irq, void *data)
+{
+	struct cec_adapter *adap = data;
+	struct dw_hdmi_cec *cec = adap->priv;
+	unsigned stat = dw_hdmi_read(cec, HDMI_IH_CEC_STAT0);
+	irqreturn_t ret = IRQ_HANDLED;
+
+	if (stat == 0)
+		return IRQ_NONE;
+
+	dw_hdmi_write(cec, stat, HDMI_IH_CEC_STAT0);
+
+	if (stat & CEC_STAT_ERROR_INIT) {
+		if (cec->retries) {
+			unsigned v = dw_hdmi_read(cec, HDMI_CEC_CTRL);
+			dw_hdmi_write(cec, v | CEC_CTRL_START, HDMI_CEC_CTRL);
+			cec->retries -= 1;
+		} else {
+			cec->tx_status = CEC_TX_STATUS_MAX_RETRIES;
+			cec->tx_done = true;
+			ret = IRQ_WAKE_THREAD;
+		}
+	} else if (stat & CEC_STAT_DONE) {
+		cec->tx_status = CEC_TX_STATUS_OK;
+		cec->tx_done = true;
+		ret = IRQ_WAKE_THREAD;
+	} else if (stat & CEC_STAT_NACK) {
+		cec->tx_status = CEC_TX_STATUS_NACK;
+		cec->tx_done = true;
+		ret = IRQ_WAKE_THREAD;
+	}
+
+	if (stat & CEC_STAT_EOM) {
+		unsigned len, i;
+
+		len = dw_hdmi_read(cec, HDMI_CEC_RX_CNT);
+		if (len > sizeof(cec->rx_msg.msg))
+			len = sizeof(cec->rx_msg.msg);
+
+		for (i = 0; i < len; i++)
+			cec->rx_msg.msg[i] =
+				dw_hdmi_read(cec, HDMI_CEC_RX_DATA0 + i);
+
+		dw_hdmi_write(cec, 0, HDMI_CEC_LOCK);
+
+		cec->rx_msg.len = len;
+		smp_wmb();
+		cec->rx_done = true;
+
+		ret = IRQ_WAKE_THREAD;
+	}
+
+	return ret;
+}
+
+static irqreturn_t dw_hdmi_cec_thread(int irq, void *data)
+{
+	struct cec_adapter *adap = data;
+	struct dw_hdmi_cec *cec = adap->priv;
+
+	if (cec->tx_done) {
+		cec->tx_done = false;
+		cec_transmit_done(adap, cec->tx_status, 0, 0, 0, 0);
+	}
+	if (cec->rx_done) {
+		cec->rx_done = false;
+		smp_rmb();
+		cec_received_msg(adap, &cec->rx_msg);
+	}
+	return IRQ_HANDLED;
+}
+
+static int dw_hdmi_cec_enable(struct cec_adapter *adap, bool enable)
+{
+	struct dw_hdmi_cec *cec = adap->priv;
+
+	if (!enable) {
+		dw_hdmi_write(cec, ~0, HDMI_CEC_MASK);
+		dw_hdmi_write(cec, ~0, HDMI_IH_MUTE_CEC_STAT0);
+		dw_hdmi_write(cec, 0, HDMI_CEC_POLARITY);
+
+		cec->ops->disable(cec->hdmi);
+	} else {
+		unsigned irqs;
+
+		dw_hdmi_write(cec, 0, HDMI_CEC_CTRL);
+		dw_hdmi_write(cec, ~0, HDMI_IH_CEC_STAT0);
+		dw_hdmi_write(cec, 0, HDMI_CEC_LOCK);
+
+		dw_hdmi_cec_log_addr(cec->adap, CEC_LOG_ADDR_INVALID);
+
+		cec->ops->enable(cec->hdmi);
+
+		irqs = CEC_STAT_ERROR_INIT | CEC_STAT_NACK | CEC_STAT_EOM |
+		       CEC_STAT_DONE;
+		dw_hdmi_write(cec, irqs, HDMI_CEC_POLARITY);
+		dw_hdmi_write(cec, ~irqs, HDMI_CEC_MASK);
+		dw_hdmi_write(cec, ~irqs, HDMI_IH_MUTE_CEC_STAT0);
+	}
+	return 0;
+}
+
+static const struct cec_adap_ops dw_hdmi_cec_ops = {
+	.adap_enable = dw_hdmi_cec_enable,
+	.adap_log_addr = dw_hdmi_cec_log_addr,
+	.adap_transmit = dw_hdmi_cec_transmit,
+};
+
+static void dw_hdmi_cec_del(void *data)
+{
+	struct dw_hdmi_cec *cec = data;
+
+	cec_delete_adapter(cec->adap);
+}
+
+static int dw_hdmi_cec_probe(struct platform_device *pdev)
+{
+	struct dw_hdmi_cec_data *data = dev_get_platdata(&pdev->dev);
+	struct dw_hdmi_cec *cec;
+	int ret;
+
+	if (!data)
+		return -ENXIO;
+
+	/*
+	 * Our device is just a convenience - we want to link to the real
+	 * hardware device here, so that userspace can see the association
+	 * between the HDMI hardware and its associated CEC chardev.
+	 */
+	cec = devm_kzalloc(&pdev->dev, sizeof(*cec), GFP_KERNEL);
+	if (!cec)
+		return -ENOMEM;
+
+	cec->irq = data->irq;
+	cec->ops = data->ops;
+	cec->hdmi = data->hdmi;
+
+	platform_set_drvdata(pdev, cec);
+
+	dw_hdmi_write(cec, 0, HDMI_CEC_TX_CNT);
+	dw_hdmi_write(cec, ~0, HDMI_CEC_MASK);
+	dw_hdmi_write(cec, ~0, HDMI_IH_MUTE_CEC_STAT0);
+	dw_hdmi_write(cec, 0, HDMI_CEC_POLARITY);
+
+	cec->adap = cec_allocate_adapter(&dw_hdmi_cec_ops, cec, "dw_hdmi",
+					 CEC_CAP_LOG_ADDRS | CEC_CAP_TRANSMIT |
+					 CEC_CAP_RC, CEC_MAX_LOG_ADDRS);
+	if (IS_ERR(cec->adap))
+		return PTR_ERR(cec->adap);
+
+	/* override the module pointer */
+	cec->adap->owner = THIS_MODULE;
+
+	ret = devm_add_action(&pdev->dev, dw_hdmi_cec_del, cec);
+	if (ret) {
+		cec_delete_adapter(cec->adap);
+		return ret;
+	}
+
+	ret = devm_request_threaded_irq(&pdev->dev, cec->irq,
+					dw_hdmi_cec_hardirq,
+					dw_hdmi_cec_thread, IRQF_SHARED,
+					"dw-hdmi-cec", cec->adap);
+	if (ret < 0)
+		return ret;
+
+	cec->notify = cec_notifier_get(pdev->dev.parent);
+	if (!cec->notify)
+		return -ENOMEM;
+
+	ret = cec_register_adapter(cec->adap, pdev->dev.parent);
+	if (ret < 0) {
+		cec_notifier_put(cec->notify);
+		return ret;
+	}
+
+	/*
+	 * CEC documentation says we must not call cec_delete_adapter
+	 * after a successful call to cec_register_adapter().
+	 */
+	devm_remove_action(&pdev->dev, dw_hdmi_cec_del, cec);
+
+	cec_register_cec_notifier(cec->adap, cec->notify);
+
+	return 0;
+}
+
+static int dw_hdmi_cec_remove(struct platform_device *pdev)
+{
+	struct dw_hdmi_cec *cec = platform_get_drvdata(pdev);
+
+	cec_unregister_adapter(cec->adap);
+	cec_notifier_put(cec->notify);
+
+	return 0;
+}
+
+static struct platform_driver dw_hdmi_cec_driver = {
+	.probe	= dw_hdmi_cec_probe,
+	.remove	= dw_hdmi_cec_remove,
+	.driver = {
+		.name = "dw-hdmi-cec",
+	},
+};
+module_platform_driver(dw_hdmi_cec_driver);
+
+MODULE_AUTHOR("Russell King [off-list ref]");
+MODULE_DESCRIPTION("Synopsis Designware HDMI CEC driver for i.MX");

Synopsis -> Synopsys

Best regards,
Jose Miguel Abreu