From: Russell King rmk+kernel@arm.linux.org.uk
Add a CEC driver for the dw-hdmi hardware using Hans Verkuil's CEC implementation.
Signed-off-by: Russell King rmk+kernel@armlinux.org.uk --- drivers/gpu/drm/bridge/Kconfig | 7 + drivers/gpu/drm/bridge/Makefile | 1 + drivers/gpu/drm/bridge/dw-hdmi-cec.c | 346 ++++++++++++++++++++++++++++++ drivers/gpu/drm/bridge/dw-hdmi.c | 64 +++++- include/linux/platform_data/dw_hdmi-cec.h | 16 ++ 5 files changed, 423 insertions(+), 11 deletions(-) create mode 100644 drivers/gpu/drm/bridge/dw-hdmi-cec.c create mode 100644 include/linux/platform_data/dw_hdmi-cec.h
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index 5f4ebe9..4ab137e 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -40,6 +40,13 @@ config DRM_DW_HDMI_AHB_AUDIO Designware HDMI block. This is used in conjunction with the i.MX6 HDMI driver.
+config DRM_DW_HDMI_CEC + tristate "Synopsis Designware CEC interface" + depends on DRM_DW_HDMI && MEDIA_CEC_SUPPORT + help + Support the CE interface which is part of the Synopsis + Designware HDMI block. + config DRM_NXP_PTN3460 tristate "NXP PTN3460 DP/LVDS bridge" depends on OF diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile index cdf3a3c..6bdd8b9 100644 --- a/drivers/gpu/drm/bridge/Makefile +++ b/drivers/gpu/drm/bridge/Makefile @@ -4,6 +4,7 @@ obj-$(CONFIG_DRM_ANALOGIX_ANX78XX) += analogix-anx78xx.o obj-$(CONFIG_DRM_DUMB_VGA_DAC) += dumb-vga-dac.o obj-$(CONFIG_DRM_DW_HDMI) += dw-hdmi.o obj-$(CONFIG_DRM_DW_HDMI_AHB_AUDIO) += dw-hdmi-ahb-audio.o +obj-$(CONFIG_DRM_DW_HDMI_CEC) += dw-hdmi-cec.o obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o obj-$(CONFIG_DRM_SII902X) += sii902x.o diff --git a/drivers/gpu/drm/bridge/dw-hdmi-cec.c b/drivers/gpu/drm/bridge/dw-hdmi-cec.c new file mode 100644 index 0000000..e7e12b5 --- /dev/null +++ b/drivers/gpu/drm/bridge/dw-hdmi-cec.c @@ -0,0 +1,346 @@ +/* http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/ + * tree/drivers/mxc/hdmi-cec/mxc_hdmi-cec.c?h=imx_3.0.35_4.1.0 */ +#include <linux/hdmi-notifier.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/notifier.h> +#include <linux/platform_data/dw_hdmi-cec.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-edid.h> + +#define DEV_NAME "mxc_hdmi_cec" + +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 { + void __iomem *base; + u32 addresses; + struct cec_adapter *adap; + struct cec_msg rx_msg; + unsigned int tx_status; + bool tx_done; + bool rx_done; + const struct dw_hdmi_cec_ops *ops; + void *ops_data; + int retries; + int irq; + struct hdmi_notifier *n; + struct notifier_block nb; +}; + +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 = BIT(15); + else + addresses = cec->addresses |= BIT(logical_addr); + + writeb_relaxed(addresses & 255, cec->base + HDMI_CEC_ADDR_L); + writeb_relaxed(addresses >> 8, cec->base + 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++) + writeb_relaxed(msg->msg[i], cec->base + HDMI_CEC_TX_DATA0 + i); + + writeb_relaxed(msg->len, cec->base + HDMI_CEC_TX_CNT); + writeb_relaxed(CEC_CTRL_NORMAL | CEC_CTRL_START, cec->base + 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 = readb_relaxed(cec->base + HDMI_IH_CEC_STAT0); + irqreturn_t ret = IRQ_HANDLED; + + if (stat == 0) + return IRQ_NONE; + + writeb_relaxed(stat, cec->base + HDMI_IH_CEC_STAT0); + + if (stat & CEC_STAT_ERROR_INIT) { + if (cec->retries) { + unsigned v = readb_relaxed(cec->base + HDMI_CEC_CTRL); + writeb_relaxed(v | CEC_CTRL_START, cec->base + 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; + void *base = cec->base; + + len = readb_relaxed(base + 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] = + readb_relaxed(base + HDMI_CEC_RX_DATA0 + i); + + writeb_relaxed(0, base + 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) { + writeb_relaxed(~0, cec->base + HDMI_CEC_MASK); + writeb_relaxed(~0, cec->base + HDMI_IH_MUTE_CEC_STAT0); + writeb_relaxed(0, cec->base + HDMI_CEC_POLARITY); + + cec->ops->disable(cec->ops_data); + } else { + unsigned irqs; + + writeb_relaxed(0, cec->base + HDMI_CEC_CTRL); + writeb_relaxed(~0, cec->base + HDMI_IH_CEC_STAT0); + writeb_relaxed(0, cec->base + HDMI_CEC_LOCK); + + dw_hdmi_cec_log_addr(cec->adap, CEC_LOG_ADDR_INVALID); + + cec->ops->enable(cec->ops_data); + + irqs = CEC_STAT_ERROR_INIT | CEC_STAT_NACK | CEC_STAT_EOM | + CEC_STAT_DONE; + writeb_relaxed(irqs, cec->base + HDMI_CEC_POLARITY); + writeb_relaxed(~irqs, cec->base + HDMI_CEC_MASK); + writeb_relaxed(~irqs, cec->base + 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 unsigned int parse_hdmi_addr(const struct edid *edid) +{ + if (!edid || edid->extensions == 0) + return (u16)~0; + + return cec_get_edid_phys_addr((u8 *)edid, + EDID_LENGTH * (edid->extensions + 1), NULL); +} + +static int dw_hdmi_cec_notify(struct notifier_block *nb, unsigned long event, + void *data) +{ + struct dw_hdmi_cec *cec = container_of(nb, struct dw_hdmi_cec, nb); + struct hdmi_notifier *n = data; + unsigned int phys; + + dev_info(cec->adap->devnode.parent, "event %lu\n", event); + + switch (event) { + case HDMI_CONNECTED: + break; + + case HDMI_DISCONNECTED: + cec_s_phys_addr(cec->adap, CEC_PHYS_ADDR_INVALID, false); + break; + + case HDMI_NEW_EDID: + phys = parse_hdmi_addr(n->edid); + cec_s_phys_addr(cec->adap, phys, false); + break; + } + + return NOTIFY_OK; +} + +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->base = data->base; + cec->irq = data->irq; + cec->ops = data->ops; + cec->ops_data = data->ops_data; + cec->nb.notifier_call = dw_hdmi_cec_notify; + + platform_set_drvdata(pdev, cec); + + writeb_relaxed(0, cec->base + HDMI_CEC_TX_CNT); + writeb_relaxed(~0, cec->base + HDMI_CEC_MASK); + writeb_relaxed(~0, cec->base + HDMI_IH_MUTE_CEC_STAT0); + writeb_relaxed(0, cec->base + 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, + pdev->dev.parent); + 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, + DEV_NAME, cec->adap); + if (ret < 0) + return ret; + + ret = cec_register_adapter(cec->adap); + if (ret < 0) + 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->n = hdmi_notifier_get(cec->adap->devnode.parent); + if (!cec->n) + return -ENOMEM; + hdmi_notifier_register(cec->n, &cec->nb); + + return 0; +} + +static int dw_hdmi_cec_remove(struct platform_device *pdev) +{ + struct dw_hdmi_cec *cec = platform_get_drvdata(pdev); + + hdmi_notifier_unregister(cec->n, &cec->nb); + hdmi_notifier_put(cec->n); + cec_unregister_adapter(cec->adap); + + 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", + .owner = THIS_MODULE, + }, +}; +module_platform_driver(dw_hdmi_cec_driver); + +MODULE_AUTHOR("Russell King rmk+kernel@arm.linux.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/dw-hdmi.c b/drivers/gpu/drm/bridge/dw-hdmi.c index bd02da5..06191b4 100644 --- a/drivers/gpu/drm/bridge/dw-hdmi.c +++ b/drivers/gpu/drm/bridge/dw-hdmi.c @@ -19,6 +19,7 @@ #include <linux/hdmi-notifier.h> #include <linux/mutex.h> #include <linux/of_device.h> +#include <linux/platform_data/dw_hdmi-cec.h> #include <linux/spinlock.h>
#include <drm/drm_of.h> @@ -108,6 +109,7 @@ struct dw_hdmi { struct drm_bridge *bridge;
struct platform_device *audio; + struct platform_device *cec; enum dw_hdmi_devtype dev_type; struct device *dev; struct clk *isfr_clk; @@ -120,6 +122,7 @@ struct dw_hdmi { int vic;
u8 edid[HDMI_EDID_LEN]; + u8 mc_clkdis; bool cable_plugin;
bool phy_enabled; @@ -1110,8 +1113,6 @@ static void dw_hdmi_phy_disable(struct dw_hdmi *hdmi) /* HDMI Initialization Step B.4 */ static void dw_hdmi_enable_video_path(struct dw_hdmi *hdmi) { - u8 clkdis; - /* control period minimum duration */ hdmi_writeb(hdmi, 12, HDMI_FC_CTRLDUR); hdmi_writeb(hdmi, 32, HDMI_FC_EXCTRLDUR); @@ -1123,23 +1124,28 @@ static void dw_hdmi_enable_video_path(struct dw_hdmi *hdmi) hdmi_writeb(hdmi, 0x21, HDMI_FC_CH2PREAM);
/* Enable pixel clock and tmds data path */ - clkdis = 0x7F; - clkdis &= ~HDMI_MC_CLKDIS_PIXELCLK_DISABLE; - hdmi_writeb(hdmi, clkdis, HDMI_MC_CLKDIS); + hdmi->mc_clkdis |= HDMI_MC_CLKDIS_HDCPCLK_DISABLE | + HDMI_MC_CLKDIS_CSCCLK_DISABLE | + HDMI_MC_CLKDIS_AUDCLK_DISABLE | + HDMI_MC_CLKDIS_PREPCLK_DISABLE | + HDMI_MC_CLKDIS_TMDSCLK_DISABLE; + hdmi->mc_clkdis &= ~HDMI_MC_CLKDIS_PIXELCLK_DISABLE; + hdmi_writeb(hdmi, hdmi->mc_clkdis, HDMI_MC_CLKDIS);
- clkdis &= ~HDMI_MC_CLKDIS_TMDSCLK_DISABLE; - hdmi_writeb(hdmi, clkdis, HDMI_MC_CLKDIS); + hdmi->mc_clkdis &= ~HDMI_MC_CLKDIS_TMDSCLK_DISABLE; + hdmi_writeb(hdmi, hdmi->mc_clkdis, HDMI_MC_CLKDIS);
/* Enable csc path */ if (is_color_space_conversion(hdmi)) { - clkdis &= ~HDMI_MC_CLKDIS_CSCCLK_DISABLE; - hdmi_writeb(hdmi, clkdis, HDMI_MC_CLKDIS); + hdmi->mc_clkdis &= ~HDMI_MC_CLKDIS_CSCCLK_DISABLE; + hdmi_writeb(hdmi, hdmi->mc_clkdis, HDMI_MC_CLKDIS); } }
static void hdmi_enable_audio_clk(struct dw_hdmi *hdmi) { - hdmi_modb(hdmi, 0, HDMI_MC_CLKDIS_AUDCLK_DISABLE, HDMI_MC_CLKDIS); + hdmi->mc_clkdis &= ~HDMI_MC_CLKDIS_AUDCLK_DISABLE; + hdmi_writeb(hdmi, hdmi->mc_clkdis, HDMI_MC_CLKDIS); }
/* Workaround to clear the overflow condition */ @@ -1299,7 +1305,6 @@ 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);
@@ -1640,6 +1645,27 @@ static int dw_hdmi_register(struct drm_device *drm, struct dw_hdmi *hdmi) return 0; }
+static void dw_hdmi_cec_enable(void *data) +{ + struct dw_hdmi *hdmi = data; + + hdmi->mc_clkdis &= ~HDMI_MC_CLKDIS_CECCLK_DISABLE; + hdmi_writeb(hdmi, hdmi->mc_clkdis, HDMI_MC_CLKDIS); +} + +static void dw_hdmi_cec_disable(void *data) +{ + struct dw_hdmi *hdmi = data; + + hdmi->mc_clkdis |= HDMI_MC_CLKDIS_CECCLK_DISABLE; + hdmi_writeb(hdmi, hdmi->mc_clkdis, HDMI_MC_CLKDIS); +} + +static const struct dw_hdmi_cec_ops dw_hdmi_cec_ops = { + .enable = dw_hdmi_cec_enable, + .disable = dw_hdmi_cec_disable, +}; + int dw_hdmi_bind(struct device *dev, struct device *master, void *data, struct drm_encoder *encoder, struct resource *iores, int irq, @@ -1650,6 +1676,7 @@ int dw_hdmi_bind(struct device *dev, struct device *master, struct platform_device_info pdevinfo; struct device_node *ddc_node; struct dw_hdmi_audio_data audio; + struct dw_hdmi_cec_data cec; struct dw_hdmi *hdmi; int ret; u32 val = 1; @@ -1668,6 +1695,7 @@ int dw_hdmi_bind(struct device *dev, struct device *master, hdmi->disabled = true; hdmi->rxsense = true; hdmi->phy_mask = (u8)~(HDMI_PHY_HPD | HDMI_PHY_RX_SENSE); + hdmi->mc_clkdis = 0x7f;
mutex_init(&hdmi->mutex); mutex_init(&hdmi->audio_mutex); @@ -1800,6 +1828,18 @@ int dw_hdmi_bind(struct device *dev, struct device *master, hdmi->audio = platform_device_register_full(&pdevinfo); }
+ cec.base = hdmi->regs; + cec.irq = irq; + cec.ops = &dw_hdmi_cec_ops; + cec.ops_data = hdmi; + + pdevinfo.name = "dw-hdmi-cec"; + pdevinfo.data = &cec; + pdevinfo.size_data = sizeof(cec); + pdevinfo.dma_mask = 0; + + hdmi->cec = platform_device_register_full(&pdevinfo); + dev_set_drvdata(dev, hdmi);
return 0; @@ -1821,6 +1861,8 @@ void dw_hdmi_unbind(struct device *dev, struct device *master, void *data)
if (hdmi->audio && !IS_ERR(hdmi->audio)) platform_device_unregister(hdmi->audio); + if (!IS_ERR(hdmi->cec)) + platform_device_unregister(hdmi->cec);
hdmi_notifier_put(hdmi->n);
diff --git a/include/linux/platform_data/dw_hdmi-cec.h b/include/linux/platform_data/dw_hdmi-cec.h new file mode 100644 index 0000000..5ff40cc --- /dev/null +++ b/include/linux/platform_data/dw_hdmi-cec.h @@ -0,0 +1,16 @@ +#ifndef DW_HDMI_CEC_H +#define DW_HDMI_CEC_H + +struct dw_hdmi_cec_ops { + void (*enable)(void *); + void (*disable)(void *); +}; + +struct dw_hdmi_cec_data { + void __iomem *base; + int irq; + const struct dw_hdmi_cec_ops *ops; + void *ops_data; +}; + +#endif