drm: sti: add VTG driver (f2cb3148) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/gpu/drm/Kconfig

+2 −0

Original line number	Diff line number	Diff line
		@@ -201,3 +201,5 @@ source "drivers/gpu/drm/msm/Kconfig"
		source "drivers/gpu/drm/tegra/Kconfig"

		source "drivers/gpu/drm/panel/Kconfig"

		source "drivers/gpu/drm/sti/Kconfig"

drivers/gpu/drm/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -64,6 +64,7 @@ obj-$(CONFIG_DRM_QXL) += qxl/
		obj-$(CONFIG_DRM_BOCHS) += bochs/
		obj-$(CONFIG_DRM_MSM) += msm/
		obj-$(CONFIG_DRM_TEGRA) += tegra/
		obj-$(CONFIG_DRM_STI) += sti/
		obj-y += i2c/
		obj-y += panel/
		obj-y += bridge/

drivers/gpu/drm/sti/Kconfig

0 → 100644

+5 −0

Original line number	Diff line number	Diff line
		config DRM_STI
		tristate "DRM Support for STMicroelectronics SoC stiH41x Series"
		depends on DRM && (SOC_STIH415 \|\| SOC_STIH416 \|\| ARCH_MULTIPLATFORM)
		help
		Choose this option to enable DRM on STM stiH41x chipset

drivers/gpu/drm/sti/Makefile

0 → 100644

+2 −0

Original line number	Diff line number	Diff line
		obj-$(CONFIG_DRM_STI) = \
		sti_vtg.o

drivers/gpu/drm/sti/sti_vtg.c

0 → 100644

+366 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) STMicroelectronics SA 2014
		* Authors: Benjamin Gaignard <benjamin.gaignard@st.com>
		* Fabien Dessenne <fabien.dessenne@st.com>
		* Vincent Abriou <vincent.abriou@st.com>
		* for STMicroelectronics.
		* License terms: GNU General Public License (GPL), version 2
		*/

		#include <linux/module.h>
		#include <linux/notifier.h>
		#include <linux/platform_device.h>

		#include <drm/drmP.h>

		#include "sti_vtg.h"

		#define VTG_TYPE_MASTER 0
		#define VTG_TYPE_SLAVE_BY_EXT0 1

		/* registers offset */
		#define VTG_MODE 0x0000
		#define VTG_CLKLN 0x0008
		#define VTG_HLFLN 0x000C
		#define VTG_DRST_AUTOC 0x0010
		#define VTG_VID_TFO 0x0040
		#define VTG_VID_TFS 0x0044
		#define VTG_VID_BFO 0x0048
		#define VTG_VID_BFS 0x004C

		#define VTG_HOST_ITS 0x0078
		#define VTG_HOST_ITS_BCLR 0x007C
		#define VTG_HOST_ITM_BCLR 0x0088
		#define VTG_HOST_ITM_BSET 0x008C

		#define VTG_H_HD_1 0x00C0
		#define VTG_TOP_V_VD_1 0x00C4
		#define VTG_BOT_V_VD_1 0x00C8
		#define VTG_TOP_V_HD_1 0x00CC
		#define VTG_BOT_V_HD_1 0x00D0

		#define VTG_H_HD_2 0x00E0
		#define VTG_TOP_V_VD_2 0x00E4
		#define VTG_BOT_V_VD_2 0x00E8
		#define VTG_TOP_V_HD_2 0x00EC
		#define VTG_BOT_V_HD_2 0x00F0

		#define VTG_H_HD_3 0x0100
		#define VTG_TOP_V_VD_3 0x0104
		#define VTG_BOT_V_VD_3 0x0108
		#define VTG_TOP_V_HD_3 0x010C
		#define VTG_BOT_V_HD_3 0x0110

		#define VTG_IRQ_BOTTOM BIT(0)
		#define VTG_IRQ_TOP BIT(1)
		#define VTG_IRQ_MASK (VTG_IRQ_TOP \| VTG_IRQ_BOTTOM)

		/* delay introduced by the Arbitrary Waveform Generator in nb of pixels */
		#define AWG_DELAY_HD (-9)
		#define AWG_DELAY_ED (-8)
		#define AWG_DELAY_SD (-7)

		LIST_HEAD(vtg_lookup);

		/**
		* STI VTG structure
		*
		* @dev: pointer to device driver
		* @data: data associated to the device
		* @irq: VTG irq
		* @type: VTG type (main or aux)
		* @notifier_list: notifier callback
		* @crtc_id: the crtc id for vblank event
		* @slave: slave vtg
		* @link: List node to link the structure in lookup list
		*/
		struct sti_vtg {
		struct device *dev;
		struct device_node *np;
		void __iomem *regs;
		int irq;
		u32 irq_status;
		struct raw_notifier_head notifier_list;
		int crtc_id;
		struct sti_vtg *slave;
		struct list_head link;
		};

		static void vtg_register(struct sti_vtg *vtg)
		{
		list_add_tail(&vtg->link, &vtg_lookup);
		}

		struct sti_vtg of_vtg_find(struct device_node np)
		{
		struct sti_vtg *vtg;

		list_for_each_entry(vtg, &vtg_lookup, link) {
		if (vtg->np == np)
		return vtg;
		}
		return NULL;
		}
		EXPORT_SYMBOL(of_vtg_find);

		static void vtg_reset(struct sti_vtg *vtg)
		{
		/* reset slave and then master */
		if (vtg->slave)
		vtg_reset(vtg->slave);

		writel(1, vtg->regs + VTG_DRST_AUTOC);
		}

		static void vtg_set_mode(struct sti_vtg *vtg,
		int type, const struct drm_display_mode *mode)
		{
		u32 tmp;

		if (vtg->slave)
		vtg_set_mode(vtg->slave, VTG_TYPE_SLAVE_BY_EXT0, mode);

		writel(mode->htotal, vtg->regs + VTG_CLKLN);
		writel(mode->vtotal * 2, vtg->regs + VTG_HLFLN);

		tmp = (mode->vtotal - mode->vsync_start + 1) << 16;
		tmp \|= mode->htotal - mode->hsync_start;
		writel(tmp, vtg->regs + VTG_VID_TFO);
		writel(tmp, vtg->regs + VTG_VID_BFO);

		tmp = (mode->vdisplay + mode->vtotal - mode->vsync_start + 1) << 16;
		tmp \|= mode->hdisplay + mode->htotal - mode->hsync_start;
		writel(tmp, vtg->regs + VTG_VID_TFS);
		writel(tmp, vtg->regs + VTG_VID_BFS);

		/* prepare VTG set 1 and 2 for HDMI and VTG set 3 for HD DAC */
		tmp = (mode->hsync_end - mode->hsync_start) << 16;
		writel(tmp, vtg->regs + VTG_H_HD_1);
		writel(tmp, vtg->regs + VTG_H_HD_2);

		tmp = (mode->vsync_end - mode->vsync_start + 1) << 16;
		tmp \|= 1;
		writel(tmp, vtg->regs + VTG_TOP_V_VD_1);
		writel(tmp, vtg->regs + VTG_BOT_V_VD_1);
		writel(0, vtg->regs + VTG_TOP_V_HD_1);
		writel(0, vtg->regs + VTG_BOT_V_HD_1);

		/* prepare VTG set 2 for for HD DCS */
		writel(tmp, vtg->regs + VTG_TOP_V_VD_2);
		writel(tmp, vtg->regs + VTG_BOT_V_VD_2);
		writel(0, vtg->regs + VTG_TOP_V_HD_2);
		writel(0, vtg->regs + VTG_BOT_V_HD_2);

		/* prepare VTG set 3 for HD Analog in HD mode */
		tmp = (mode->hsync_end - mode->hsync_start + AWG_DELAY_HD) << 16;
		tmp \|= mode->htotal + AWG_DELAY_HD;
		writel(tmp, vtg->regs + VTG_H_HD_3);

		tmp = (mode->vsync_end - mode->vsync_start) << 16;
		tmp \|= mode->vtotal;
		writel(tmp, vtg->regs + VTG_TOP_V_VD_3);
		writel(tmp, vtg->regs + VTG_BOT_V_VD_3);

		tmp = (mode->htotal + AWG_DELAY_HD) << 16;
		tmp \|= mode->htotal + AWG_DELAY_HD;
		writel(tmp, vtg->regs + VTG_TOP_V_HD_3);
		writel(tmp, vtg->regs + VTG_BOT_V_HD_3);

		/* mode */
		writel(type, vtg->regs + VTG_MODE);
		}

		static void vtg_enable_irq(struct sti_vtg *vtg)
		{
		/* clear interrupt status and mask */
		writel(0xFFFF, vtg->regs + VTG_HOST_ITS_BCLR);
		writel(0xFFFF, vtg->regs + VTG_HOST_ITM_BCLR);
		writel(VTG_IRQ_MASK, vtg->regs + VTG_HOST_ITM_BSET);
		}

		void sti_vtg_set_config(struct sti_vtg *vtg,
		const struct drm_display_mode *mode)
		{
		/* write configuration */
		vtg_set_mode(vtg, VTG_TYPE_MASTER, mode);

		vtg_reset(vtg);

		/* enable irq for the vtg vblank synchro */
		if (vtg->slave)
		vtg_enable_irq(vtg->slave);
		else
		vtg_enable_irq(vtg);
		}
		EXPORT_SYMBOL(sti_vtg_set_config);

		/**
		* sti_vtg_get_line_number
		*
		* @mode: display mode to be used
		* @y: line
		*
		* Return the line number according to the display mode taking
		* into account the Sync and Back Porch information.
		* Video frame line numbers start at 1, y starts at 0.
		* In interlaced modes the start line is the field line number of the odd
		* field, but y is still defined as a progressive frame.
		*/
		u32 sti_vtg_get_line_number(struct drm_display_mode mode, int y)
		{
		u32 start_line = mode.vtotal - mode.vsync_start + 1;

		if (mode.flags & DRM_MODE_FLAG_INTERLACE)
		start_line *= 2;

		return start_line + y;
		}
		EXPORT_SYMBOL(sti_vtg_get_line_number);

		/**
		* sti_vtg_get_pixel_number
		*
		* @mode: display mode to be used
		* @x: row
		*
		* Return the pixel number according to the display mode taking
		* into account the Sync and Back Porch information.
		* Pixels are counted from 0.
		*/
		u32 sti_vtg_get_pixel_number(struct drm_display_mode mode, int x)
		{
		return mode.htotal - mode.hsync_start + x;
		}
		EXPORT_SYMBOL(sti_vtg_get_pixel_number);

		int sti_vtg_register_client(struct sti_vtg *vtg,
		struct notifier_block *nb, int crtc_id)
		{
		if (vtg->slave)
		return sti_vtg_register_client(vtg->slave, nb, crtc_id);

		vtg->crtc_id = crtc_id;
		return raw_notifier_chain_register(&vtg->notifier_list, nb);
		}
		EXPORT_SYMBOL(sti_vtg_register_client);

		int sti_vtg_unregister_client(struct sti_vtg vtg, struct notifier_block nb)
		{
		if (vtg->slave)
		return sti_vtg_unregister_client(vtg->slave, nb);

		return raw_notifier_chain_unregister(&vtg->notifier_list, nb);
		}
		EXPORT_SYMBOL(sti_vtg_unregister_client);

		static irqreturn_t vtg_irq_thread(int irq, void *arg)
		{
		struct sti_vtg *vtg = arg;
		u32 event;

		event = (vtg->irq_status & VTG_IRQ_TOP) ?
		VTG_TOP_FIELD_EVENT : VTG_BOTTOM_FIELD_EVENT;

		raw_notifier_call_chain(&vtg->notifier_list, event, &vtg->crtc_id);

		return IRQ_HANDLED;
		}

		static irqreturn_t vtg_irq(int irq, void *arg)
		{
		struct sti_vtg *vtg = arg;

		vtg->irq_status = readl(vtg->regs + VTG_HOST_ITS);

		writel(vtg->irq_status, vtg->regs + VTG_HOST_ITS_BCLR);

		/* force sync bus write */
		readl(vtg->regs + VTG_HOST_ITS);

		return IRQ_WAKE_THREAD;
		}

		static int vtg_probe(struct platform_device *pdev)
		{
		struct device *dev = &pdev->dev;
		struct device_node *np;
		struct sti_vtg *vtg;
		struct resource *res;
		char irq_name[32];
		int ret;

		vtg = devm_kzalloc(dev, sizeof(*vtg), GFP_KERNEL);
		if (!vtg)
		return -ENOMEM;

		vtg->dev = dev;
		vtg->np = pdev->dev.of_node;

		/* Get Memory ressources */
		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		if (!res) {
		DRM_ERROR("Get memory resource failed\n");
		return -ENOMEM;
		}
		vtg->regs = devm_ioremap_nocache(dev, res->start, resource_size(res));

		np = of_parse_phandle(pdev->dev.of_node, "st,slave", 0);
		if (np) {
		vtg->slave = of_vtg_find(np);

		if (!vtg->slave)
		return -EPROBE_DEFER;
		} else {
		vtg->irq = platform_get_irq(pdev, 0);
		if (IS_ERR_VALUE(vtg->irq)) {
		DRM_ERROR("Failed to get VTG interrupt\n");
		return vtg->irq;
		}

		snprintf(irq_name, sizeof(irq_name), "vsync-%s",
		dev_name(vtg->dev));

		RAW_INIT_NOTIFIER_HEAD(&vtg->notifier_list);

		ret = devm_request_threaded_irq(dev, vtg->irq, vtg_irq,
		vtg_irq_thread, IRQF_ONESHOT, irq_name, vtg);
		if (IS_ERR_VALUE(ret)) {
		DRM_ERROR("Failed to register VTG interrupt\n");
		return ret;
		}
		}

		vtg_register(vtg);
		platform_set_drvdata(pdev, vtg);

		DRM_INFO("%s %s\n", __func__, dev_name(vtg->dev));

		return 0;
		}

		static int vtg_remove(struct platform_device *pdev)
		{
		return 0;
		}

		static const struct of_device_id vtg_of_match[] = {
		{ .compatible = "st,vtg", },
		{ /* sentinel */ }
		};
		MODULE_DEVICE_TABLE(of, vtg_of_match);

		struct platform_driver sti_vtg_driver = {
		.driver = {
		.name = "sti-vtg",
		.owner = THIS_MODULE,
		.of_match_table = vtg_of_match,
		},
		.probe = vtg_probe,
		.remove = vtg_remove,
		};

		module_platform_driver(sti_vtg_driver);

		MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
		MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
		MODULE_LICENSE("GPL");