drm/bridge: dw-hdmi: add cec driver
Add a CEC driver for the dw-hdmi hardware. Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> [hans.verkuil: unsigned -> unsigned int] [hans.verkuil: cec_transmit_done -> cec_transmit_attempt_done] [hans.verkuil: add missing CEC_CAP_PASSTHROUGH] Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Tested-by: Hans Verkuil <hans.verkuil@cisco.com> Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Archit Taneja <architt@codeaurora.org> Link: https://patchwork.freedesktop.org/patch/msgid/20170802184108.7913-4-hverkuil@xs4all.nl
This commit is contained in:
Russell King
Archit Taneja
parent
e383bf85d3
commit
a616e63c56
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@ -24,6 +24,15 @@ config DRM_DW_HDMI_I2S_AUDIO
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Support the I2S Audio interface which is part of the Synopsys
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Designware HDMI block.
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config DRM_DW_HDMI_CEC
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tristate "Synopsis Designware CEC interface"
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depends on DRM_DW_HDMI
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select CEC_CORE
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select CEC_NOTIFIER
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help
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Support the CE interface which is part of the Synopsys
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Designware HDMI block.
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config DRM_DW_MIPI_DSI
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tristate
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select DRM_KMS_HELPER
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@ -3,5 +3,6 @@
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obj-$(CONFIG_DRM_DW_HDMI) += dw-hdmi.o
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obj-$(CONFIG_DRM_DW_HDMI_AHB_AUDIO) += dw-hdmi-ahb-audio.o
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obj-$(CONFIG_DRM_DW_HDMI_I2S_AUDIO) += dw-hdmi-i2s-audio.o
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obj-$(CONFIG_DRM_DW_HDMI_CEC) += dw-hdmi-cec.o
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obj-$(CONFIG_DRM_DW_MIPI_DSI) += dw-mipi-dsi.o
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@ -0,0 +1,327 @@
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/*
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* Designware HDMI CEC driver
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*
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* Copyright (C) 2015-2017 Russell King.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <drm/drm_edid.h>
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#include <media/cec.h>
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#include <media/cec-notifier.h>
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#include "dw-hdmi-cec.h"
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enum {
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HDMI_IH_CEC_STAT0 = 0x0106,
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HDMI_IH_MUTE_CEC_STAT0 = 0x0186,
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HDMI_CEC_CTRL = 0x7d00,
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CEC_CTRL_START = BIT(0),
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CEC_CTRL_FRAME_TYP = 3 << 1,
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CEC_CTRL_RETRY = 0 << 1,
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CEC_CTRL_NORMAL = 1 << 1,
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CEC_CTRL_IMMED = 2 << 1,
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HDMI_CEC_STAT = 0x7d01,
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CEC_STAT_DONE = BIT(0),
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CEC_STAT_EOM = BIT(1),
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CEC_STAT_NACK = BIT(2),
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CEC_STAT_ARBLOST = BIT(3),
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CEC_STAT_ERROR_INIT = BIT(4),
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CEC_STAT_ERROR_FOLL = BIT(5),
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CEC_STAT_WAKEUP = BIT(6),
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HDMI_CEC_MASK = 0x7d02,
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HDMI_CEC_POLARITY = 0x7d03,
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HDMI_CEC_INT = 0x7d04,
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HDMI_CEC_ADDR_L = 0x7d05,
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HDMI_CEC_ADDR_H = 0x7d06,
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HDMI_CEC_TX_CNT = 0x7d07,
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HDMI_CEC_RX_CNT = 0x7d08,
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HDMI_CEC_TX_DATA0 = 0x7d10,
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HDMI_CEC_RX_DATA0 = 0x7d20,
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HDMI_CEC_LOCK = 0x7d30,
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HDMI_CEC_WKUPCTRL = 0x7d31,
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};
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struct dw_hdmi_cec {
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struct dw_hdmi *hdmi;
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const struct dw_hdmi_cec_ops *ops;
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u32 addresses;
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struct cec_adapter *adap;
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struct cec_msg rx_msg;
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unsigned int tx_status;
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bool tx_done;
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bool rx_done;
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struct cec_notifier *notify;
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int irq;
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};
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static void dw_hdmi_write(struct dw_hdmi_cec *cec, u8 val, int offset)
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{
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cec->ops->write(cec->hdmi, val, offset);
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}
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static u8 dw_hdmi_read(struct dw_hdmi_cec *cec, int offset)
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{
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return cec->ops->read(cec->hdmi, offset);
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}
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static int dw_hdmi_cec_log_addr(struct cec_adapter *adap, u8 logical_addr)
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{
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struct dw_hdmi_cec *cec = cec_get_drvdata(adap);
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if (logical_addr == CEC_LOG_ADDR_INVALID)
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cec->addresses = 0;
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else
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cec->addresses |= BIT(logical_addr) | BIT(15);
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dw_hdmi_write(cec, cec->addresses & 255, HDMI_CEC_ADDR_L);
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dw_hdmi_write(cec, cec->addresses >> 8, HDMI_CEC_ADDR_H);
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return 0;
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}
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static int dw_hdmi_cec_transmit(struct cec_adapter *adap, u8 attempts,
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u32 signal_free_time, struct cec_msg *msg)
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{
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struct dw_hdmi_cec *cec = cec_get_drvdata(adap);
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unsigned int i, ctrl;
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switch (signal_free_time) {
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case CEC_SIGNAL_FREE_TIME_RETRY:
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ctrl = CEC_CTRL_RETRY;
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break;
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case CEC_SIGNAL_FREE_TIME_NEW_INITIATOR:
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default:
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ctrl = CEC_CTRL_NORMAL;
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break;
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case CEC_SIGNAL_FREE_TIME_NEXT_XFER:
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ctrl = CEC_CTRL_IMMED;
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break;
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}
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for (i = 0; i < msg->len; i++)
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dw_hdmi_write(cec, msg->msg[i], HDMI_CEC_TX_DATA0 + i);
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dw_hdmi_write(cec, msg->len, HDMI_CEC_TX_CNT);
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dw_hdmi_write(cec, ctrl | CEC_CTRL_START, HDMI_CEC_CTRL);
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return 0;
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}
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static irqreturn_t dw_hdmi_cec_hardirq(int irq, void *data)
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{
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struct cec_adapter *adap = data;
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struct dw_hdmi_cec *cec = cec_get_drvdata(adap);
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unsigned int stat = dw_hdmi_read(cec, HDMI_IH_CEC_STAT0);
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irqreturn_t ret = IRQ_HANDLED;
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if (stat == 0)
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return IRQ_NONE;
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dw_hdmi_write(cec, stat, HDMI_IH_CEC_STAT0);
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if (stat & CEC_STAT_ERROR_INIT) {
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cec->tx_status = CEC_TX_STATUS_ERROR;
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cec->tx_done = true;
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ret = IRQ_WAKE_THREAD;
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} else if (stat & CEC_STAT_DONE) {
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cec->tx_status = CEC_TX_STATUS_OK;
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cec->tx_done = true;
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ret = IRQ_WAKE_THREAD;
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} else if (stat & CEC_STAT_NACK) {
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cec->tx_status = CEC_TX_STATUS_NACK;
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cec->tx_done = true;
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ret = IRQ_WAKE_THREAD;
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}
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if (stat & CEC_STAT_EOM) {
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unsigned int len, i;
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len = dw_hdmi_read(cec, HDMI_CEC_RX_CNT);
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if (len > sizeof(cec->rx_msg.msg))
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len = sizeof(cec->rx_msg.msg);
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for (i = 0; i < len; i++)
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cec->rx_msg.msg[i] =
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dw_hdmi_read(cec, HDMI_CEC_RX_DATA0 + i);
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dw_hdmi_write(cec, 0, HDMI_CEC_LOCK);
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cec->rx_msg.len = len;
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smp_wmb();
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cec->rx_done = true;
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ret = IRQ_WAKE_THREAD;
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}
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return ret;
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}
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static irqreturn_t dw_hdmi_cec_thread(int irq, void *data)
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{
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struct cec_adapter *adap = data;
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struct dw_hdmi_cec *cec = cec_get_drvdata(adap);
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if (cec->tx_done) {
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cec->tx_done = false;
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cec_transmit_attempt_done(adap, cec->tx_status);
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}
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if (cec->rx_done) {
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cec->rx_done = false;
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smp_rmb();
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cec_received_msg(adap, &cec->rx_msg);
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}
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return IRQ_HANDLED;
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}
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static int dw_hdmi_cec_enable(struct cec_adapter *adap, bool enable)
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{
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struct dw_hdmi_cec *cec = cec_get_drvdata(adap);
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if (!enable) {
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dw_hdmi_write(cec, ~0, HDMI_CEC_MASK);
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dw_hdmi_write(cec, ~0, HDMI_IH_MUTE_CEC_STAT0);
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dw_hdmi_write(cec, 0, HDMI_CEC_POLARITY);
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cec->ops->disable(cec->hdmi);
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} else {
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unsigned int irqs;
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dw_hdmi_write(cec, 0, HDMI_CEC_CTRL);
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dw_hdmi_write(cec, ~0, HDMI_IH_CEC_STAT0);
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dw_hdmi_write(cec, 0, HDMI_CEC_LOCK);
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dw_hdmi_cec_log_addr(cec->adap, CEC_LOG_ADDR_INVALID);
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cec->ops->enable(cec->hdmi);
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irqs = CEC_STAT_ERROR_INIT | CEC_STAT_NACK | CEC_STAT_EOM |
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CEC_STAT_DONE;
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dw_hdmi_write(cec, irqs, HDMI_CEC_POLARITY);
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dw_hdmi_write(cec, ~irqs, HDMI_CEC_MASK);
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dw_hdmi_write(cec, ~irqs, HDMI_IH_MUTE_CEC_STAT0);
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}
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return 0;
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}
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static const struct cec_adap_ops dw_hdmi_cec_ops = {
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.adap_enable = dw_hdmi_cec_enable,
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.adap_log_addr = dw_hdmi_cec_log_addr,
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.adap_transmit = dw_hdmi_cec_transmit,
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};
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static void dw_hdmi_cec_del(void *data)
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{
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struct dw_hdmi_cec *cec = data;
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cec_delete_adapter(cec->adap);
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}
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static int dw_hdmi_cec_probe(struct platform_device *pdev)
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{
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struct dw_hdmi_cec_data *data = dev_get_platdata(&pdev->dev);
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struct dw_hdmi_cec *cec;
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int ret;
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if (!data)
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return -ENXIO;
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/*
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* Our device is just a convenience - we want to link to the real
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* hardware device here, so that userspace can see the association
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* between the HDMI hardware and its associated CEC chardev.
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*/
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cec = devm_kzalloc(&pdev->dev, sizeof(*cec), GFP_KERNEL);
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if (!cec)
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return -ENOMEM;
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cec->irq = data->irq;
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cec->ops = data->ops;
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cec->hdmi = data->hdmi;
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platform_set_drvdata(pdev, cec);
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dw_hdmi_write(cec, 0, HDMI_CEC_TX_CNT);
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dw_hdmi_write(cec, ~0, HDMI_CEC_MASK);
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dw_hdmi_write(cec, ~0, HDMI_IH_MUTE_CEC_STAT0);
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dw_hdmi_write(cec, 0, HDMI_CEC_POLARITY);
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cec->adap = cec_allocate_adapter(&dw_hdmi_cec_ops, cec, "dw_hdmi",
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CEC_CAP_LOG_ADDRS | CEC_CAP_TRANSMIT |
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CEC_CAP_RC | CEC_CAP_PASSTHROUGH,
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CEC_MAX_LOG_ADDRS);
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if (IS_ERR(cec->adap))
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return PTR_ERR(cec->adap);
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/* override the module pointer */
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cec->adap->owner = THIS_MODULE;
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ret = devm_add_action(&pdev->dev, dw_hdmi_cec_del, cec);
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if (ret) {
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cec_delete_adapter(cec->adap);
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return ret;
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}
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ret = devm_request_threaded_irq(&pdev->dev, cec->irq,
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dw_hdmi_cec_hardirq,
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dw_hdmi_cec_thread, IRQF_SHARED,
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"dw-hdmi-cec", cec->adap);
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if (ret < 0)
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return ret;
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cec->notify = cec_notifier_get(pdev->dev.parent);
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if (!cec->notify)
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return -ENOMEM;
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ret = cec_register_adapter(cec->adap, pdev->dev.parent);
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if (ret < 0) {
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cec_notifier_put(cec->notify);
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return ret;
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}
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/*
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* CEC documentation says we must not call cec_delete_adapter
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* after a successful call to cec_register_adapter().
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*/
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devm_remove_action(&pdev->dev, dw_hdmi_cec_del, cec);
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cec_register_cec_notifier(cec->adap, cec->notify);
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return 0;
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}
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static int dw_hdmi_cec_remove(struct platform_device *pdev)
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{
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struct dw_hdmi_cec *cec = platform_get_drvdata(pdev);
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cec_unregister_adapter(cec->adap);
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cec_notifier_put(cec->notify);
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return 0;
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}
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static struct platform_driver dw_hdmi_cec_driver = {
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.probe = dw_hdmi_cec_probe,
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.remove = dw_hdmi_cec_remove,
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.driver = {
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.name = "dw-hdmi-cec",
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},
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};
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module_platform_driver(dw_hdmi_cec_driver);
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MODULE_AUTHOR("Russell King <rmk+kernel@armlinux.org.uk>");
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MODULE_DESCRIPTION("Synopsys Designware HDMI CEC driver for i.MX");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS(PLATFORM_MODULE_PREFIX "dw-hdmi-cec");
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@ -0,0 +1,19 @@
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#ifndef DW_HDMI_CEC_H
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#define DW_HDMI_CEC_H
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struct dw_hdmi;
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struct dw_hdmi_cec_ops {
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void (*write)(struct dw_hdmi *hdmi, u8 val, int offset);
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u8 (*read)(struct dw_hdmi *hdmi, int offset);
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void (*enable)(struct dw_hdmi *hdmi);
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void (*disable)(struct dw_hdmi *hdmi);
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};
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struct dw_hdmi_cec_data {
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struct dw_hdmi *hdmi;
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const struct dw_hdmi_cec_ops *ops;
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int irq;
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};
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#endif
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@ -35,6 +35,7 @@
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#include "dw-hdmi.h"
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#include "dw-hdmi-audio.h"
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#include "dw-hdmi-cec.h"
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#include <media/cec-notifier.h>
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@ -133,6 +134,7 @@ struct dw_hdmi {
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unsigned int version;
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struct platform_device *audio;
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struct platform_device *cec;
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struct device *dev;
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struct clk *isfr_clk;
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struct clk *iahb_clk;
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@ -1794,7 +1796,6 @@ static void initialize_hdmi_ih_mutes(struct dw_hdmi *hdmi)
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hdmi_writeb(hdmi, 0xff, HDMI_AUD_HBR_MASK);
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hdmi_writeb(hdmi, 0xff, HDMI_GP_MASK);
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hdmi_writeb(hdmi, 0xff, HDMI_A_APIINTMSK);
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hdmi_writeb(hdmi, 0xff, HDMI_CEC_MASK);
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hdmi_writeb(hdmi, 0xff, HDMI_I2CM_INT);
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hdmi_writeb(hdmi, 0xff, HDMI_I2CM_CTLINT);
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@ -2236,6 +2237,29 @@ static int dw_hdmi_detect_phy(struct dw_hdmi *hdmi)
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return -ENODEV;
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}
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static void dw_hdmi_cec_enable(struct dw_hdmi *hdmi)
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{
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mutex_lock(&hdmi->mutex);
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hdmi->mc_clkdis &= ~HDMI_MC_CLKDIS_CECCLK_DISABLE;
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hdmi_writeb(hdmi, hdmi->mc_clkdis, HDMI_MC_CLKDIS);
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mutex_unlock(&hdmi->mutex);
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}
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static void dw_hdmi_cec_disable(struct dw_hdmi *hdmi)
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{
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mutex_lock(&hdmi->mutex);
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hdmi->mc_clkdis |= HDMI_MC_CLKDIS_CECCLK_DISABLE;
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hdmi_writeb(hdmi, hdmi->mc_clkdis, HDMI_MC_CLKDIS);
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mutex_unlock(&hdmi->mutex);
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}
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static const struct dw_hdmi_cec_ops dw_hdmi_cec_ops = {
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.write = hdmi_writeb,
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.read = hdmi_readb,
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.enable = dw_hdmi_cec_enable,
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.disable = dw_hdmi_cec_disable,
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};
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static const struct regmap_config hdmi_regmap_8bit_config = {
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||||
.reg_bits = 32,
|
||||
.val_bits = 8,
|
||||
|
|
@ -2258,6 +2282,7 @@ __dw_hdmi_probe(struct platform_device *pdev,
|
|||
struct device_node *np = dev->of_node;
|
||||
struct platform_device_info pdevinfo;
|
||||
struct device_node *ddc_node;
|
||||
struct dw_hdmi_cec_data cec;
|
||||
struct dw_hdmi *hdmi;
|
||||
struct resource *iores = NULL;
|
||||
int irq;
|
||||
|
|
@ -2462,6 +2487,19 @@ __dw_hdmi_probe(struct platform_device *pdev,
|
|||
hdmi->audio = platform_device_register_full(&pdevinfo);
|
||||
}
|
||||
|
||||
if (config0 & HDMI_CONFIG0_CEC) {
|
||||
cec.hdmi = hdmi;
|
||||
cec.ops = &dw_hdmi_cec_ops;
|
||||
cec.irq = irq;
|
||||
|
||||
pdevinfo.name = "dw-hdmi-cec";
|
||||
pdevinfo.data = &cec;
|
||||
pdevinfo.size_data = sizeof(cec);
|
||||
pdevinfo.dma_mask = 0;
|
||||
|
||||
hdmi->cec = platform_device_register_full(&pdevinfo);
|
||||
}
|
||||
|
||||
/* Reset HDMI DDC I2C master controller and mute I2CM interrupts */
|
||||
if (hdmi->i2c)
|
||||
dw_hdmi_i2c_init(hdmi);
|
||||
|
|
@ -2492,6 +2530,8 @@ static void __dw_hdmi_remove(struct dw_hdmi *hdmi)
|
|||
{
|
||||
if (hdmi->audio && !IS_ERR(hdmi->audio))
|
||||
platform_device_unregister(hdmi->audio);
|
||||
if (!IS_ERR(hdmi->cec))
|
||||
platform_device_unregister(hdmi->cec);
|
||||
|
||||
/* Disable all interrupts */
|
||||
hdmi_writeb(hdmi, ~0, HDMI_IH_MUTE_PHY_STAT0);
|
||||
|
|
|
|||
|
|
@ -555,6 +555,7 @@ enum {
|
|||
|
||||
/* CONFIG0_ID field values */
|
||||
HDMI_CONFIG0_I2S = 0x10,
|
||||
HDMI_CONFIG0_CEC = 0x02,
|
||||
|
||||
/* CONFIG1_ID field values */
|
||||
HDMI_CONFIG1_AHB = 0x01,
|
||||
|
|
|
|||
Loading…
Reference in New Issue