media: move CEC platform drivers to a separate directory

As CEC support doesn't depend on MEDIA_SUPPORT, let's
place the platform drivers outside the media menu.

As a side effect, instead of depends on PCI, seco driver
can select it (and DMI).

Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

1 files changed, 0 insertions, 481 deletions

diff --git a/drivers/media/platform/tegra-cec/tegra_cec.c b/drivers/media/platform/tegra-cec/tegra_cec.c
deleted file mode 100644
index 1ac0c70a5981..000000000000
--- a/drivers/media/platform/tegra-cec/tegra_cec.c
+++ /dev/null
@@ -1,481 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Tegra CEC implementation
- *
- * The original 3.10 CEC driver using a custom API:
- *
- * Copyright (c) 2012-2015, NVIDIA CORPORATION.  All rights reserved.
- *
- * Conversion to the CEC framework and to the mainline kernel:
- *
- * Copyright 2016-2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/err.h>
-#include <linux/errno.h>
-#include <linux/interrupt.h>
-#include <linux/slab.h>
-#include <linux/io.h>
-#include <linux/clk.h>
-#include <linux/delay.h>
-#include <linux/pm.h>
-#include <linux/of.h>
-#include <linux/of_platform.h>
-#include <linux/platform_device.h>
-#include <linux/clk/tegra.h>
-
-#include <media/cec-notifier.h>
-
-#include "tegra_cec.h"
-
-#define TEGRA_CEC_NAME "tegra-cec"
-
-struct tegra_cec {
-	struct cec_adapter	*adap;
-	struct device		*dev;
-	struct clk		*clk;
-	void __iomem		*cec_base;
-	struct cec_notifier	*notifier;
-	int			tegra_cec_irq;
-	bool			rx_done;
-	bool			tx_done;
-	int			tx_status;
-	u8			rx_buf[CEC_MAX_MSG_SIZE];
-	u8			rx_buf_cnt;
-	u32			tx_buf[CEC_MAX_MSG_SIZE];
-	u8			tx_buf_cur;
-	u8			tx_buf_cnt;
-};
-
-static inline u32 cec_read(struct tegra_cec *cec, u32 reg)
-{
-	return readl(cec->cec_base + reg);
-}
-
-static inline void cec_write(struct tegra_cec *cec, u32 reg, u32 val)
-{
-	writel(val, cec->cec_base + reg);
-}
-
-static void tegra_cec_error_recovery(struct tegra_cec *cec)
-{
-	u32 hw_ctrl;
-
-	hw_ctrl = cec_read(cec, TEGRA_CEC_HW_CONTROL);
-	cec_write(cec, TEGRA_CEC_HW_CONTROL, 0);
-	cec_write(cec, TEGRA_CEC_INT_STAT, 0xffffffff);
-	cec_write(cec, TEGRA_CEC_HW_CONTROL, hw_ctrl);
-}
-
-static irqreturn_t tegra_cec_irq_thread_handler(int irq, void *data)
-{
-	struct device *dev = data;
-	struct tegra_cec *cec = dev_get_drvdata(dev);
-
-	if (cec->tx_done) {
-		cec_transmit_attempt_done(cec->adap, cec->tx_status);
-		cec->tx_done = false;
-	}
-	if (cec->rx_done) {
-		struct cec_msg msg = {};
-
-		msg.len = cec->rx_buf_cnt;
-		memcpy(msg.msg, cec->rx_buf, msg.len);
-		cec_received_msg(cec->adap, &msg);
-		cec->rx_done = false;
-		cec->rx_buf_cnt = 0;
-	}
-	return IRQ_HANDLED;
-}
-
-static irqreturn_t tegra_cec_irq_handler(int irq, void *data)
-{
-	struct device *dev = data;
-	struct tegra_cec *cec = dev_get_drvdata(dev);
-	u32 status, mask;
-
-	status = cec_read(cec, TEGRA_CEC_INT_STAT);
-	mask = cec_read(cec, TEGRA_CEC_INT_MASK);
-
-	status &= mask;
-
-	if (!status)
-		return IRQ_HANDLED;
-
-	if (status & TEGRA_CEC_INT_STAT_TX_REGISTER_UNDERRUN) {
-		dev_err(dev, "TX underrun, interrupt timing issue!\n");
-
-		tegra_cec_error_recovery(cec);
-		cec_write(cec, TEGRA_CEC_INT_MASK,
-			  mask & ~TEGRA_CEC_INT_MASK_TX_REGISTER_EMPTY);
-
-		cec->tx_done = true;
-		cec->tx_status = CEC_TX_STATUS_ERROR;
-		return IRQ_WAKE_THREAD;
-	}
-
-	if ((status & TEGRA_CEC_INT_STAT_TX_ARBITRATION_FAILED) ||
-		   (status & TEGRA_CEC_INT_STAT_TX_BUS_ANOMALY_DETECTED)) {
-		tegra_cec_error_recovery(cec);
-		cec_write(cec, TEGRA_CEC_INT_MASK,
-			  mask & ~TEGRA_CEC_INT_MASK_TX_REGISTER_EMPTY);
-
-		cec->tx_done = true;
-		if (status & TEGRA_CEC_INT_STAT_TX_BUS_ANOMALY_DETECTED)
-			cec->tx_status = CEC_TX_STATUS_LOW_DRIVE;
-		else
-			cec->tx_status = CEC_TX_STATUS_ARB_LOST;
-		return IRQ_WAKE_THREAD;
-	}
-
-	if (status & TEGRA_CEC_INT_STAT_TX_FRAME_TRANSMITTED) {
-		cec_write(cec, TEGRA_CEC_INT_STAT,
-			  TEGRA_CEC_INT_STAT_TX_FRAME_TRANSMITTED);
-
-		if (status & TEGRA_CEC_INT_STAT_TX_FRAME_OR_BLOCK_NAKD) {
-			tegra_cec_error_recovery(cec);
-
-			cec->tx_done = true;
-			cec->tx_status = CEC_TX_STATUS_NACK;
-		} else {
-			cec->tx_done = true;
-			cec->tx_status = CEC_TX_STATUS_OK;
-		}
-		return IRQ_WAKE_THREAD;
-	}
-
-	if (status & TEGRA_CEC_INT_STAT_TX_FRAME_OR_BLOCK_NAKD)
-		dev_warn(dev, "TX NAKed on the fly!\n");
-
-	if (status & TEGRA_CEC_INT_STAT_TX_REGISTER_EMPTY) {
-		if (cec->tx_buf_cur == cec->tx_buf_cnt) {
-			cec_write(cec, TEGRA_CEC_INT_MASK,
-				  mask & ~TEGRA_CEC_INT_MASK_TX_REGISTER_EMPTY);
-		} else {
-			cec_write(cec, TEGRA_CEC_TX_REGISTER,
-				  cec->tx_buf[cec->tx_buf_cur++]);
-			cec_write(cec, TEGRA_CEC_INT_STAT,
-				  TEGRA_CEC_INT_STAT_TX_REGISTER_EMPTY);
-		}
-	}
-
-	if (status & TEGRA_CEC_INT_STAT_RX_START_BIT_DETECTED) {
-		cec_write(cec, TEGRA_CEC_INT_STAT,
-			  TEGRA_CEC_INT_STAT_RX_START_BIT_DETECTED);
-		cec->rx_done = false;
-		cec->rx_buf_cnt = 0;
-	}
-	if (status & TEGRA_CEC_INT_STAT_RX_REGISTER_FULL) {
-		u32 v;
-
-		cec_write(cec, TEGRA_CEC_INT_STAT,
-			  TEGRA_CEC_INT_STAT_RX_REGISTER_FULL);
-		v = cec_read(cec, TEGRA_CEC_RX_REGISTER);
-		if (cec->rx_buf_cnt < CEC_MAX_MSG_SIZE)
-			cec->rx_buf[cec->rx_buf_cnt++] = v & 0xff;
-		if (v & TEGRA_CEC_RX_REGISTER_EOM) {
-			cec->rx_done = true;
-			return IRQ_WAKE_THREAD;
-		}
-	}
-
-	return IRQ_HANDLED;
-}
-
-static int tegra_cec_adap_enable(struct cec_adapter *adap, bool enable)
-{
-	struct tegra_cec *cec = adap->priv;
-
-	cec->rx_buf_cnt = 0;
-	cec->tx_buf_cnt = 0;
-	cec->tx_buf_cur = 0;
-
-	cec_write(cec, TEGRA_CEC_HW_CONTROL, 0);
-	cec_write(cec, TEGRA_CEC_INT_MASK, 0);
-	cec_write(cec, TEGRA_CEC_INT_STAT, 0xffffffff);
-	cec_write(cec, TEGRA_CEC_SW_CONTROL, 0);
-
-	if (!enable)
-		return 0;
-
-	cec_write(cec, TEGRA_CEC_INPUT_FILTER, (1U << 31) | 0x20);
-
-	cec_write(cec, TEGRA_CEC_RX_TIMING_0,
-		  (0x7a << TEGRA_CEC_RX_TIM0_START_BIT_MAX_LO_TIME_SHIFT) |
-		  (0x6d << TEGRA_CEC_RX_TIM0_START_BIT_MIN_LO_TIME_SHIFT) |
-		  (0x93 << TEGRA_CEC_RX_TIM0_START_BIT_MAX_DURATION_SHIFT) |
-		  (0x86 << TEGRA_CEC_RX_TIM0_START_BIT_MIN_DURATION_SHIFT));
-
-	cec_write(cec, TEGRA_CEC_RX_TIMING_1,
-		  (0x35 << TEGRA_CEC_RX_TIM1_DATA_BIT_MAX_LO_TIME_SHIFT) |
-		  (0x21 << TEGRA_CEC_RX_TIM1_DATA_BIT_SAMPLE_TIME_SHIFT) |
-		  (0x56 << TEGRA_CEC_RX_TIM1_DATA_BIT_MAX_DURATION_SHIFT) |
-		  (0x40 << TEGRA_CEC_RX_TIM1_DATA_BIT_MIN_DURATION_SHIFT));
-
-	cec_write(cec, TEGRA_CEC_RX_TIMING_2,
-		  (0x50 << TEGRA_CEC_RX_TIM2_END_OF_BLOCK_TIME_SHIFT));
-
-	cec_write(cec, TEGRA_CEC_TX_TIMING_0,
-		  (0x74 << TEGRA_CEC_TX_TIM0_START_BIT_LO_TIME_SHIFT) |
-		  (0x8d << TEGRA_CEC_TX_TIM0_START_BIT_DURATION_SHIFT) |
-		  (0x08 << TEGRA_CEC_TX_TIM0_BUS_XITION_TIME_SHIFT) |
-		  (0x71 << TEGRA_CEC_TX_TIM0_BUS_ERROR_LO_TIME_SHIFT));
-
-	cec_write(cec, TEGRA_CEC_TX_TIMING_1,
-		  (0x2f << TEGRA_CEC_TX_TIM1_LO_DATA_BIT_LO_TIME_SHIFT) |
-		  (0x13 << TEGRA_CEC_TX_TIM1_HI_DATA_BIT_LO_TIME_SHIFT) |
-		  (0x4b << TEGRA_CEC_TX_TIM1_DATA_BIT_DURATION_SHIFT) |
-		  (0x21 << TEGRA_CEC_TX_TIM1_ACK_NAK_BIT_SAMPLE_TIME_SHIFT));
-
-	cec_write(cec, TEGRA_CEC_TX_TIMING_2,
-		  (0x07 << TEGRA_CEC_TX_TIM2_BUS_IDLE_TIME_ADDITIONAL_FRAME_SHIFT) |
-		  (0x05 << TEGRA_CEC_TX_TIM2_BUS_IDLE_TIME_NEW_FRAME_SHIFT) |
-		  (0x03 << TEGRA_CEC_TX_TIM2_BUS_IDLE_TIME_RETRY_FRAME_SHIFT));
-
-	cec_write(cec, TEGRA_CEC_INT_MASK,
-		  TEGRA_CEC_INT_MASK_TX_REGISTER_UNDERRUN |
-		  TEGRA_CEC_INT_MASK_TX_FRAME_OR_BLOCK_NAKD |
-		  TEGRA_CEC_INT_MASK_TX_ARBITRATION_FAILED |
-		  TEGRA_CEC_INT_MASK_TX_BUS_ANOMALY_DETECTED |
-		  TEGRA_CEC_INT_MASK_TX_FRAME_TRANSMITTED |
-		  TEGRA_CEC_INT_MASK_RX_REGISTER_FULL |
-		  TEGRA_CEC_INT_MASK_RX_START_BIT_DETECTED);
-
-	cec_write(cec, TEGRA_CEC_HW_CONTROL, TEGRA_CEC_HWCTRL_TX_RX_MODE);
-	return 0;
-}
-
-static int tegra_cec_adap_log_addr(struct cec_adapter *adap, u8 logical_addr)
-{
-	struct tegra_cec *cec = adap->priv;
-	u32 state = cec_read(cec, TEGRA_CEC_HW_CONTROL);
-
-	if (logical_addr == CEC_LOG_ADDR_INVALID)
-		state &= ~TEGRA_CEC_HWCTRL_RX_LADDR_MASK;
-	else
-		state |= TEGRA_CEC_HWCTRL_RX_LADDR((1 << logical_addr));
-
-	cec_write(cec, TEGRA_CEC_HW_CONTROL, state);
-	return 0;
-}
-
-static int tegra_cec_adap_monitor_all_enable(struct cec_adapter *adap,
-					     bool enable)
-{
-	struct tegra_cec *cec = adap->priv;
-	u32 reg = cec_read(cec, TEGRA_CEC_HW_CONTROL);
-
-	if (enable)
-		reg |= TEGRA_CEC_HWCTRL_RX_SNOOP;
-	else
-		reg &= ~TEGRA_CEC_HWCTRL_RX_SNOOP;
-	cec_write(cec, TEGRA_CEC_HW_CONTROL, reg);
-	return 0;
-}
-
-static int tegra_cec_adap_transmit(struct cec_adapter *adap, u8 attempts,
-				   u32 signal_free_time_ms, struct cec_msg *msg)
-{
-	bool retry_xfer = signal_free_time_ms == CEC_SIGNAL_FREE_TIME_RETRY;
-	struct tegra_cec *cec = adap->priv;
-	unsigned int i;
-	u32 mode = 0;
-	u32 mask;
-
-	if (cec_msg_is_broadcast(msg))
-		mode = TEGRA_CEC_TX_REG_BCAST;
-
-	cec->tx_buf_cur = 0;
-	cec->tx_buf_cnt = msg->len;
-
-	for (i = 0; i < msg->len; i++) {
-		cec->tx_buf[i] = mode | msg->msg[i];
-		if (i == 0)
-			cec->tx_buf[i] |= TEGRA_CEC_TX_REG_START_BIT;
-		if (i == msg->len - 1)
-			cec->tx_buf[i] |= TEGRA_CEC_TX_REG_EOM;
-		if (i == 0 && retry_xfer)
-			cec->tx_buf[i] |= TEGRA_CEC_TX_REG_RETRY;
-	}
-
-	mask = cec_read(cec, TEGRA_CEC_INT_MASK);
-	cec_write(cec, TEGRA_CEC_INT_MASK,
-		  mask | TEGRA_CEC_INT_MASK_TX_REGISTER_EMPTY);
-
-	return 0;
-}
-
-static const struct cec_adap_ops tegra_cec_ops = {
-	.adap_enable = tegra_cec_adap_enable,
-	.adap_log_addr = tegra_cec_adap_log_addr,
-	.adap_transmit = tegra_cec_adap_transmit,
-	.adap_monitor_all_enable = tegra_cec_adap_monitor_all_enable,
-};
-
-static int tegra_cec_probe(struct platform_device *pdev)
-{
-	struct device *hdmi_dev;
-	struct tegra_cec *cec;
-	struct resource *res;
-	int ret = 0;
-
-	hdmi_dev = cec_notifier_parse_hdmi_phandle(&pdev->dev);
-
-	if (IS_ERR(hdmi_dev))
-		return PTR_ERR(hdmi_dev);
-
-	cec = devm_kzalloc(&pdev->dev, sizeof(struct tegra_cec), GFP_KERNEL);
-
-	if (!cec)
-		return -ENOMEM;
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-
-	if (!res) {
-		dev_err(&pdev->dev,
-			"Unable to allocate resources for device\n");
-		return -EBUSY;
-	}
-
-	if (!devm_request_mem_region(&pdev->dev, res->start, resource_size(res),
-		pdev->name)) {
-		dev_err(&pdev->dev,
-			"Unable to request mem region for device\n");
-		return -EBUSY;
-	}
-
-	cec->tegra_cec_irq = platform_get_irq(pdev, 0);
-
-	if (cec->tegra_cec_irq <= 0)
-		return -EBUSY;
-
-	cec->cec_base = devm_ioremap(&pdev->dev, res->start,
-					     resource_size(res));
-
-	if (!cec->cec_base) {
-		dev_err(&pdev->dev, "Unable to grab IOs for device\n");
-		return -EBUSY;
-	}
-
-	cec->clk = devm_clk_get(&pdev->dev, "cec");
-
-	if (IS_ERR_OR_NULL(cec->clk)) {
-		dev_err(&pdev->dev, "Can't get clock for CEC\n");
-		return -ENOENT;
-	}
-
-	clk_prepare_enable(cec->clk);
-
-	/* set context info. */
-	cec->dev = &pdev->dev;
-
-	platform_set_drvdata(pdev, cec);
-
-	ret = devm_request_threaded_irq(&pdev->dev, cec->tegra_cec_irq,
-		tegra_cec_irq_handler, tegra_cec_irq_thread_handler,
-		0, "cec_irq", &pdev->dev);
-
-	if (ret) {
-		dev_err(&pdev->dev,
-			"Unable to request interrupt for device\n");
-		goto err_clk;
-	}
-
-	cec->adap = cec_allocate_adapter(&tegra_cec_ops, cec, TEGRA_CEC_NAME,
-			CEC_CAP_DEFAULTS | CEC_CAP_MONITOR_ALL |
-			CEC_CAP_CONNECTOR_INFO,
-			CEC_MAX_LOG_ADDRS);
-	if (IS_ERR(cec->adap)) {
-		ret = -ENOMEM;
-		dev_err(&pdev->dev, "Couldn't create cec adapter\n");
-		goto err_clk;
-	}
-
-	cec->notifier = cec_notifier_cec_adap_register(hdmi_dev, NULL,
-						       cec->adap);
-	if (!cec->notifier) {
-		ret = -ENOMEM;
-		goto err_adapter;
-	}
-
-	ret = cec_register_adapter(cec->adap, &pdev->dev);
-	if (ret) {
-		dev_err(&pdev->dev, "Couldn't register device\n");
-		goto err_notifier;
-	}
-
-	return 0;
-
-err_notifier:
-	cec_notifier_cec_adap_unregister(cec->notifier, cec->adap);
-err_adapter:
-	cec_delete_adapter(cec->adap);
-err_clk:
-	clk_disable_unprepare(cec->clk);
-	return ret;
-}
-
-static int tegra_cec_remove(struct platform_device *pdev)
-{
-	struct tegra_cec *cec = platform_get_drvdata(pdev);
-
-	clk_disable_unprepare(cec->clk);
-
-	cec_notifier_cec_adap_unregister(cec->notifier, cec->adap);
-	cec_unregister_adapter(cec->adap);
-
-	return 0;
-}
-
-#ifdef CONFIG_PM
-static int tegra_cec_suspend(struct platform_device *pdev, pm_message_t state)
-{
-	struct tegra_cec *cec = platform_get_drvdata(pdev);
-
-	clk_disable_unprepare(cec->clk);
-
-	dev_notice(&pdev->dev, "suspended\n");
-	return 0;
-}
-
-static int tegra_cec_resume(struct platform_device *pdev)
-{
-	struct tegra_cec *cec = platform_get_drvdata(pdev);
-
-	dev_notice(&pdev->dev, "Resuming\n");
-
-	clk_prepare_enable(cec->clk);
-
-	return 0;
-}
-#endif
-
-static const struct of_device_id tegra_cec_of_match[] = {
-	{ .compatible = "nvidia,tegra114-cec", },
-	{ .compatible = "nvidia,tegra124-cec", },
-	{ .compatible = "nvidia,tegra210-cec", },
-	{},
-};
-
-static struct platform_driver tegra_cec_driver = {
-	.driver = {
-		.name = TEGRA_CEC_NAME,
-		.of_match_table = of_match_ptr(tegra_cec_of_match),
-	},
-	.probe = tegra_cec_probe,
-	.remove = tegra_cec_remove,
-
-#ifdef CONFIG_PM
-	.suspend = tegra_cec_suspend,
-	.resume = tegra_cec_resume,
-#endif
-};
-
-module_platform_driver(tegra_cec_driver);
-
-MODULE_DESCRIPTION("Tegra HDMI CEC driver");
-MODULE_AUTHOR("NVIDIA CORPORATION");
-MODULE_AUTHOR("Cisco Systems, Inc. and/or its affiliates");
-MODULE_LICENSE("GPL v2");