Add a CEC driver for the dw-hdmi hardware.
Signed-off-by: Russell King rmk+kernel@armlinux.org.uk --- drivers/gpu/drm/bridge/synopsys/Kconfig | 8 + drivers/gpu/drm/bridge/synopsys/Makefile | 1 + drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c | 320 ++++++++++++++++++++++++++ drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.h | 19 ++ drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 40 +++- 5 files changed, 387 insertions(+), 1 deletion(-) create mode 100644 drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c create mode 100644 drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.h
diff --git a/drivers/gpu/drm/bridge/synopsys/Kconfig b/drivers/gpu/drm/bridge/synopsys/Kconfig index 40d2827a6d19..bd30a0a07272 100644 --- a/drivers/gpu/drm/bridge/synopsys/Kconfig +++ b/drivers/gpu/drm/bridge/synopsys/Kconfig @@ -21,3 +21,11 @@ config DRM_DW_HDMI_I2S_AUDIO help Support the I2S Audio interface which is part of the Synopsys Designware HDMI block. + +config DRM_DW_HDMI_CEC + tristate "Synopsis Designware CEC interface" + depends on DRM_DW_HDMI && MEDIA_CEC_SUPPORT + select MEDIA_CEC_NOTIFIER + help + Support the CE interface which is part of the Synopsis + Designware HDMI block. diff --git a/drivers/gpu/drm/bridge/synopsys/Makefile b/drivers/gpu/drm/bridge/synopsys/Makefile index 17aa7a65b57e..6fe415903668 100644 --- a/drivers/gpu/drm/bridge/synopsys/Makefile +++ b/drivers/gpu/drm/bridge/synopsys/Makefile @@ -3,3 +3,4 @@ obj-$(CONFIG_DRM_DW_HDMI) += dw-hdmi.o obj-$(CONFIG_DRM_DW_HDMI_AHB_AUDIO) += dw-hdmi-ahb-audio.o obj-$(CONFIG_DRM_DW_HDMI_I2S_AUDIO) += dw-hdmi-i2s-audio.o +obj-$(CONFIG_DRM_DW_HDMI_CEC) += dw-hdmi-cec.o diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c new file mode 100644 index 000000000000..761ef5ae687d --- /dev/null +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c @@ -0,0 +1,320 @@ +/* + * Designware HDMI CEC driver + * + * Copyright (C) 2015-2017 Russell King. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/sched.h> +#include <linux/slab.h> + +#include <drm/drm_edid.h> + +#include <media/cec.h> +#include <media/cec-notifier.h> + +#include "dw-hdmi-cec.h" + +enum { + HDMI_IH_CEC_STAT0 = 0x0106, + HDMI_IH_MUTE_CEC_STAT0 = 0x0186, + + HDMI_CEC_CTRL = 0x7d00, + CEC_CTRL_START = BIT(0), + CEC_CTRL_NORMAL = 1 << 1, + + HDMI_CEC_STAT = 0x7d01, + CEC_STAT_DONE = BIT(0), + CEC_STAT_EOM = BIT(1), + CEC_STAT_NACK = BIT(2), + CEC_STAT_ARBLOST = BIT(3), + CEC_STAT_ERROR_INIT = BIT(4), + CEC_STAT_ERROR_FOLL = BIT(5), + CEC_STAT_WAKEUP = BIT(6), + + 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; + 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; + + 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 rmk+kernel@armlinux.org.uk"); +MODULE_DESCRIPTION("Synopsis Designware HDMI CEC driver for i.MX"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS(PLATFORM_MODULE_PREFIX "dw-hdmi-cec"); diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.h b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.h new file mode 100644 index 000000000000..cf4dc121a2c4 --- /dev/null +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.h @@ -0,0 +1,19 @@ +#ifndef DW_HDMI_CEC_H +#define DW_HDMI_CEC_H + +struct dw_hdmi; + +struct dw_hdmi_cec_ops { + void (*write)(struct dw_hdmi *hdmi, u8 val, int offset); + u8 (*read)(struct dw_hdmi *hdmi, int offset); + void (*enable)(struct dw_hdmi *hdmi); + void (*disable)(struct dw_hdmi *hdmi); +}; + +struct dw_hdmi_cec_data { + struct dw_hdmi *hdmi; + const struct dw_hdmi_cec_ops *ops; + int irq; +}; + +#endif diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c index 58781d4c1034..5a389f1f58d9 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c @@ -35,6 +35,7 @@
#include "dw-hdmi.h" #include "dw-hdmi-audio.h" +#include "dw-hdmi-cec.h"
#include <media/cec-notifier.h>
@@ -133,6 +134,7 @@ struct dw_hdmi { unsigned int version;
struct platform_device *audio; + struct platform_device *cec; struct device *dev; struct clk *isfr_clk; struct clk *iahb_clk; @@ -1766,7 +1768,6 @@ static void initialize_hdmi_ih_mutes(struct dw_hdmi *hdmi) hdmi_writeb(hdmi, 0xff, HDMI_AUD_HBR_MASK); hdmi_writeb(hdmi, 0xff, HDMI_GP_MASK); hdmi_writeb(hdmi, 0xff, HDMI_A_APIINTMSK); - hdmi_writeb(hdmi, 0xff, HDMI_CEC_MASK); hdmi_writeb(hdmi, 0xff, HDMI_I2CM_INT); hdmi_writeb(hdmi, 0xff, HDMI_I2CM_CTLINT);
@@ -2223,6 +2224,29 @@ static int dw_hdmi_detect_phy(struct dw_hdmi *hdmi) return -ENODEV; }
+static void dw_hdmi_cec_enable(struct dw_hdmi *hdmi) +{ + mutex_lock(&hdmi->mutex); + hdmi->mc_clkdis &= ~HDMI_MC_CLKDIS_CECCLK_DISABLE; + hdmi_writeb(hdmi, hdmi->mc_clkdis, HDMI_MC_CLKDIS); + mutex_unlock(&hdmi->mutex); +} + +static void dw_hdmi_cec_disable(struct dw_hdmi *hdmi) +{ + mutex_lock(&hdmi->mutex); + hdmi->mc_clkdis |= HDMI_MC_CLKDIS_CECCLK_DISABLE; + hdmi_writeb(hdmi, hdmi->mc_clkdis, HDMI_MC_CLKDIS); + mutex_unlock(&hdmi->mutex); +} + +static const struct dw_hdmi_cec_ops dw_hdmi_cec_ops = { + .write = hdmi_writeb, + .read = hdmi_readb, + .enable = dw_hdmi_cec_enable, + .disable = dw_hdmi_cec_disable, +}; + static const struct regmap_config hdmi_regmap_8bit_config = { .reg_bits = 32, .val_bits = 8, @@ -2245,6 +2269,7 @@ __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; @@ -2445,6 +2470,17 @@ __dw_hdmi_probe(struct platform_device *pdev, hdmi->audio = platform_device_register_full(&pdevinfo); }
+ 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); @@ -2475,6 +2511,8 @@ 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);