From e5fd91f1ef340da553f7a79da9540c3db711c937 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Tue, 8 Sep 2015 01:01:14 -0300
Subject: Linux-libre 4.2-gnu

---
 drivers/gpu/drm/exynos/exynos5433_drm_decon.c | 660 ++++++++++++++++++++++++++
 1 file changed, 660 insertions(+)
 create mode 100644 drivers/gpu/drm/exynos/exynos5433_drm_decon.c

(limited to 'drivers/gpu/drm/exynos/exynos5433_drm_decon.c')

diff --git a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
new file mode 100644
index 000000000..8b1225f24
--- /dev/null
+++ b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
@@ -0,0 +1,660 @@
+/* drivers/gpu/drm/exynos5433_drm_decon.c
+ *
+ * Copyright (C) 2015 Samsung Electronics Co.Ltd
+ * Authors:
+ *	Joonyoung Shim <jy0922.shim@samsung.com>
+ *	Hyungwon Hwang <human.hwang@samsung.com>
+ *
+ * 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 Foundationr
+ */
+
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/of_gpio.h>
+#include <linux/pm_runtime.h>
+
+#include <video/exynos5433_decon.h>
+
+#include "exynos_drm_drv.h"
+#include "exynos_drm_crtc.h"
+#include "exynos_drm_plane.h"
+#include "exynos_drm_iommu.h"
+
+#define WINDOWS_NR	3
+#define MIN_FB_WIDTH_FOR_16WORD_BURST	128
+
+struct decon_context {
+	struct device			*dev;
+	struct drm_device		*drm_dev;
+	struct exynos_drm_crtc		*crtc;
+	struct exynos_drm_plane		planes[WINDOWS_NR];
+	void __iomem			*addr;
+	struct clk			*clks[6];
+	unsigned int			default_win;
+	unsigned long			irq_flags;
+	int				pipe;
+	bool				suspended;
+
+#define BIT_CLKS_ENABLED		0
+#define BIT_IRQS_ENABLED		1
+	unsigned long			enabled;
+	bool				i80_if;
+	atomic_t			win_updated;
+};
+
+static const char * const decon_clks_name[] = {
+	"aclk_decon",
+	"aclk_smmu_decon0x",
+	"aclk_xiu_decon0x",
+	"pclk_smmu_decon0x",
+	"sclk_decon_vclk",
+	"sclk_decon_eclk",
+};
+
+static int decon_enable_vblank(struct exynos_drm_crtc *crtc)
+{
+	struct decon_context *ctx = crtc->ctx;
+	u32 val;
+
+	if (ctx->suspended)
+		return -EPERM;
+
+	if (test_and_set_bit(0, &ctx->irq_flags)) {
+		val = VIDINTCON0_INTEN;
+		if (ctx->i80_if)
+			val |= VIDINTCON0_FRAMEDONE;
+		else
+			val |= VIDINTCON0_INTFRMEN;
+
+		writel(val, ctx->addr + DECON_VIDINTCON0);
+	}
+
+	return 0;
+}
+
+static void decon_disable_vblank(struct exynos_drm_crtc *crtc)
+{
+	struct decon_context *ctx = crtc->ctx;
+
+	if (ctx->suspended)
+		return;
+
+	if (test_and_clear_bit(0, &ctx->irq_flags))
+		writel(0, ctx->addr + DECON_VIDINTCON0);
+}
+
+static void decon_setup_trigger(struct decon_context *ctx)
+{
+	u32 val = TRIGCON_TRIGEN_PER_F | TRIGCON_TRIGEN_F |
+			TRIGCON_TE_AUTO_MASK | TRIGCON_SWTRIGEN;
+	writel(val, ctx->addr + DECON_TRIGCON);
+}
+
+static void decon_commit(struct exynos_drm_crtc *crtc)
+{
+	struct decon_context *ctx = crtc->ctx;
+	struct drm_display_mode *mode = &crtc->base.mode;
+	u32 val;
+
+	if (ctx->suspended)
+		return;
+
+	/* enable clock gate */
+	val = CMU_CLKGAGE_MODE_SFR_F | CMU_CLKGAGE_MODE_MEM_F;
+	writel(val, ctx->addr + DECON_CMU);
+
+	/* lcd on and use command if */
+	val = VIDOUT_LCD_ON;
+	if (ctx->i80_if)
+		val |= VIDOUT_COMMAND_IF;
+	else
+		val |= VIDOUT_RGB_IF;
+	writel(val, ctx->addr + DECON_VIDOUTCON0);
+
+	val = VIDTCON2_LINEVAL(mode->vdisplay - 1) |
+		VIDTCON2_HOZVAL(mode->hdisplay - 1);
+	writel(val, ctx->addr + DECON_VIDTCON2);
+
+	if (!ctx->i80_if) {
+		val = VIDTCON00_VBPD_F(
+				mode->crtc_vtotal - mode->crtc_vsync_end) |
+			VIDTCON00_VFPD_F(
+				mode->crtc_vsync_start - mode->crtc_vdisplay);
+		writel(val, ctx->addr + DECON_VIDTCON00);
+
+		val = VIDTCON01_VSPW_F(
+				mode->crtc_vsync_end - mode->crtc_vsync_start);
+		writel(val, ctx->addr + DECON_VIDTCON01);
+
+		val = VIDTCON10_HBPD_F(
+				mode->crtc_htotal - mode->crtc_hsync_end) |
+			VIDTCON10_HFPD_F(
+				mode->crtc_hsync_start - mode->crtc_hdisplay);
+		writel(val, ctx->addr + DECON_VIDTCON10);
+
+		val = VIDTCON11_HSPW_F(
+				mode->crtc_hsync_end - mode->crtc_hsync_start);
+		writel(val, ctx->addr + DECON_VIDTCON11);
+	}
+
+	decon_setup_trigger(ctx);
+
+	/* enable output and display signal */
+	val = VIDCON0_ENVID | VIDCON0_ENVID_F;
+	writel(val, ctx->addr + DECON_VIDCON0);
+}
+
+#define COORDINATE_X(x)		(((x) & 0xfff) << 12)
+#define COORDINATE_Y(x)		((x) & 0xfff)
+#define OFFSIZE(x)		(((x) & 0x3fff) << 14)
+#define PAGEWIDTH(x)		((x) & 0x3fff)
+
+static void decon_win_set_pixfmt(struct decon_context *ctx, unsigned int win)
+{
+	struct exynos_drm_plane *plane = &ctx->planes[win];
+	unsigned long val;
+
+	val = readl(ctx->addr + DECON_WINCONx(win));
+	val &= ~WINCONx_BPPMODE_MASK;
+
+	switch (plane->pixel_format) {
+	case DRM_FORMAT_XRGB1555:
+		val |= WINCONx_BPPMODE_16BPP_I1555;
+		val |= WINCONx_HAWSWP_F;
+		val |= WINCONx_BURSTLEN_16WORD;
+		break;
+	case DRM_FORMAT_RGB565:
+		val |= WINCONx_BPPMODE_16BPP_565;
+		val |= WINCONx_HAWSWP_F;
+		val |= WINCONx_BURSTLEN_16WORD;
+		break;
+	case DRM_FORMAT_XRGB8888:
+		val |= WINCONx_BPPMODE_24BPP_888;
+		val |= WINCONx_WSWP_F;
+		val |= WINCONx_BURSTLEN_16WORD;
+		break;
+	case DRM_FORMAT_ARGB8888:
+		val |= WINCONx_BPPMODE_32BPP_A8888;
+		val |= WINCONx_WSWP_F | WINCONx_BLD_PIX_F | WINCONx_ALPHA_SEL_F;
+		val |= WINCONx_BURSTLEN_16WORD;
+		break;
+	default:
+		DRM_ERROR("Proper pixel format is not set\n");
+		return;
+	}
+
+	DRM_DEBUG_KMS("bpp = %u\n", plane->bpp);
+
+	/*
+	 * In case of exynos, setting dma-burst to 16Word causes permanent
+	 * tearing for very small buffers, e.g. cursor buffer. Burst Mode
+	 * switching which is based on plane size is not recommended as
+	 * plane size varies a lot towards the end of the screen and rapid
+	 * movement causes unstable DMA which results into iommu crash/tear.
+	 */
+
+	if (plane->fb_width < MIN_FB_WIDTH_FOR_16WORD_BURST) {
+		val &= ~WINCONx_BURSTLEN_MASK;
+		val |= WINCONx_BURSTLEN_8WORD;
+	}
+
+	writel(val, ctx->addr + DECON_WINCONx(win));
+}
+
+static void decon_shadow_protect_win(struct decon_context *ctx, int win,
+					bool protect)
+{
+	u32 val;
+
+	val = readl(ctx->addr + DECON_SHADOWCON);
+
+	if (protect)
+		val |= SHADOWCON_Wx_PROTECT(win);
+	else
+		val &= ~SHADOWCON_Wx_PROTECT(win);
+
+	writel(val, ctx->addr + DECON_SHADOWCON);
+}
+
+static void decon_win_commit(struct exynos_drm_crtc *crtc, unsigned int win)
+{
+	struct decon_context *ctx = crtc->ctx;
+	struct exynos_drm_plane *plane;
+	u32 val;
+
+	if (win < 0 || win >= WINDOWS_NR)
+		return;
+
+	plane = &ctx->planes[win];
+
+	if (ctx->suspended)
+		return;
+
+	decon_shadow_protect_win(ctx, win, true);
+
+	val = COORDINATE_X(plane->crtc_x) | COORDINATE_Y(plane->crtc_y);
+	writel(val, ctx->addr + DECON_VIDOSDxA(win));
+
+	val = COORDINATE_X(plane->crtc_x + plane->crtc_width - 1) |
+		COORDINATE_Y(plane->crtc_y + plane->crtc_height - 1);
+	writel(val, ctx->addr + DECON_VIDOSDxB(win));
+
+	val = VIDOSD_Wx_ALPHA_R_F(0x0) | VIDOSD_Wx_ALPHA_G_F(0x0) |
+		VIDOSD_Wx_ALPHA_B_F(0x0);
+	writel(val, ctx->addr + DECON_VIDOSDxC(win));
+
+	val = VIDOSD_Wx_ALPHA_R_F(0x0) | VIDOSD_Wx_ALPHA_G_F(0x0) |
+		VIDOSD_Wx_ALPHA_B_F(0x0);
+	writel(val, ctx->addr + DECON_VIDOSDxD(win));
+
+	writel(plane->dma_addr[0], ctx->addr + DECON_VIDW0xADD0B0(win));
+
+	val = plane->dma_addr[0] + plane->pitch * plane->crtc_height;
+	writel(val, ctx->addr + DECON_VIDW0xADD1B0(win));
+
+	val = OFFSIZE(plane->pitch - plane->crtc_width * (plane->bpp >> 3))
+		| PAGEWIDTH(plane->crtc_width * (plane->bpp >> 3));
+	writel(val, ctx->addr + DECON_VIDW0xADD2(win));
+
+	decon_win_set_pixfmt(ctx, win);
+
+	/* window enable */
+	val = readl(ctx->addr + DECON_WINCONx(win));
+	val |= WINCONx_ENWIN_F;
+	writel(val, ctx->addr + DECON_WINCONx(win));
+
+	decon_shadow_protect_win(ctx, win, false);
+
+	/* standalone update */
+	val = readl(ctx->addr + DECON_UPDATE);
+	val |= STANDALONE_UPDATE_F;
+	writel(val, ctx->addr + DECON_UPDATE);
+
+	if (ctx->i80_if)
+		atomic_set(&ctx->win_updated, 1);
+}
+
+static void decon_win_disable(struct exynos_drm_crtc *crtc, unsigned int win)
+{
+	struct decon_context *ctx = crtc->ctx;
+	struct exynos_drm_plane *plane;
+	u32 val;
+
+	if (win < 0 || win >= WINDOWS_NR)
+		return;
+
+	plane = &ctx->planes[win];
+
+	if (ctx->suspended)
+		return;
+
+	decon_shadow_protect_win(ctx, win, true);
+
+	/* window disable */
+	val = readl(ctx->addr + DECON_WINCONx(win));
+	val &= ~WINCONx_ENWIN_F;
+	writel(val, ctx->addr + DECON_WINCONx(win));
+
+	decon_shadow_protect_win(ctx, win, false);
+
+	/* standalone update */
+	val = readl(ctx->addr + DECON_UPDATE);
+	val |= STANDALONE_UPDATE_F;
+	writel(val, ctx->addr + DECON_UPDATE);
+}
+
+static void decon_swreset(struct decon_context *ctx)
+{
+	unsigned int tries;
+
+	writel(0, ctx->addr + DECON_VIDCON0);
+	for (tries = 2000; tries; --tries) {
+		if (~readl(ctx->addr + DECON_VIDCON0) & VIDCON0_STOP_STATUS)
+			break;
+		udelay(10);
+	}
+
+	WARN(tries == 0, "failed to disable DECON\n");
+
+	writel(VIDCON0_SWRESET, ctx->addr + DECON_VIDCON0);
+	for (tries = 2000; tries; --tries) {
+		if (~readl(ctx->addr + DECON_VIDCON0) & VIDCON0_SWRESET)
+			break;
+		udelay(10);
+	}
+
+	WARN(tries == 0, "failed to software reset DECON\n");
+}
+
+static void decon_enable(struct exynos_drm_crtc *crtc)
+{
+	struct decon_context *ctx = crtc->ctx;
+	int ret;
+	int i;
+
+	if (!ctx->suspended)
+		return;
+
+	ctx->suspended = false;
+
+	pm_runtime_get_sync(ctx->dev);
+
+	for (i = 0; i < ARRAY_SIZE(decon_clks_name); i++) {
+		ret = clk_prepare_enable(ctx->clks[i]);
+		if (ret < 0)
+			goto err;
+	}
+
+	set_bit(BIT_CLKS_ENABLED, &ctx->enabled);
+
+	/* if vblank was enabled status, enable it again. */
+	if (test_and_clear_bit(0, &ctx->irq_flags))
+		decon_enable_vblank(ctx->crtc);
+
+	decon_commit(ctx->crtc);
+
+	return;
+err:
+	while (--i >= 0)
+		clk_disable_unprepare(ctx->clks[i]);
+
+	ctx->suspended = true;
+}
+
+static void decon_disable(struct exynos_drm_crtc *crtc)
+{
+	struct decon_context *ctx = crtc->ctx;
+	int i;
+
+	if (ctx->suspended)
+		return;
+
+	/*
+	 * We need to make sure that all windows are disabled before we
+	 * suspend that connector. Otherwise we might try to scan from
+	 * a destroyed buffer later.
+	 */
+	for (i = 0; i < WINDOWS_NR; i++)
+		decon_win_disable(crtc, i);
+
+	decon_swreset(ctx);
+
+	for (i = 0; i < ARRAY_SIZE(decon_clks_name); i++)
+		clk_disable_unprepare(ctx->clks[i]);
+
+	clear_bit(BIT_CLKS_ENABLED, &ctx->enabled);
+
+	pm_runtime_put_sync(ctx->dev);
+
+	ctx->suspended = true;
+}
+
+void decon_te_irq_handler(struct exynos_drm_crtc *crtc)
+{
+	struct decon_context *ctx = crtc->ctx;
+	u32 val;
+
+	if (!test_bit(BIT_CLKS_ENABLED, &ctx->enabled))
+		return;
+
+	if (atomic_add_unless(&ctx->win_updated, -1, 0)) {
+		/* trigger */
+		val = readl(ctx->addr + DECON_TRIGCON);
+		val |= TRIGCON_SWTRIGCMD;
+		writel(val, ctx->addr + DECON_TRIGCON);
+	}
+
+	drm_handle_vblank(ctx->drm_dev, ctx->pipe);
+}
+
+static void decon_clear_channels(struct exynos_drm_crtc *crtc)
+{
+	struct decon_context *ctx = crtc->ctx;
+	int win, i, ret;
+	u32 val;
+
+	DRM_DEBUG_KMS("%s\n", __FILE__);
+
+	for (i = 0; i < ARRAY_SIZE(decon_clks_name); i++) {
+		ret = clk_prepare_enable(ctx->clks[i]);
+		if (ret < 0)
+			goto err;
+	}
+
+	for (win = 0; win < WINDOWS_NR; win++) {
+		/* shadow update disable */
+		val = readl(ctx->addr + DECON_SHADOWCON);
+		val |= SHADOWCON_Wx_PROTECT(win);
+		writel(val, ctx->addr + DECON_SHADOWCON);
+
+		/* window disable */
+		val = readl(ctx->addr + DECON_WINCONx(win));
+		val &= ~WINCONx_ENWIN_F;
+		writel(val, ctx->addr + DECON_WINCONx(win));
+
+		/* shadow update enable */
+		val = readl(ctx->addr + DECON_SHADOWCON);
+		val &= ~SHADOWCON_Wx_PROTECT(win);
+		writel(val, ctx->addr + DECON_SHADOWCON);
+
+		/* standalone update */
+		val = readl(ctx->addr + DECON_UPDATE);
+		val |= STANDALONE_UPDATE_F;
+		writel(val, ctx->addr + DECON_UPDATE);
+	}
+	/* TODO: wait for possible vsync */
+	msleep(50);
+
+err:
+	while (--i >= 0)
+		clk_disable_unprepare(ctx->clks[i]);
+}
+
+static struct exynos_drm_crtc_ops decon_crtc_ops = {
+	.enable			= decon_enable,
+	.disable		= decon_disable,
+	.commit			= decon_commit,
+	.enable_vblank		= decon_enable_vblank,
+	.disable_vblank		= decon_disable_vblank,
+	.commit			= decon_commit,
+	.win_commit		= decon_win_commit,
+	.win_disable		= decon_win_disable,
+	.te_handler		= decon_te_irq_handler,
+	.clear_channels		= decon_clear_channels,
+};
+
+static int decon_bind(struct device *dev, struct device *master, void *data)
+{
+	struct decon_context *ctx = dev_get_drvdata(dev);
+	struct drm_device *drm_dev = data;
+	struct exynos_drm_private *priv = drm_dev->dev_private;
+	struct exynos_drm_plane *exynos_plane;
+	enum drm_plane_type type;
+	unsigned int zpos;
+	int ret;
+
+	ctx->drm_dev = drm_dev;
+	ctx->pipe = priv->pipe++;
+
+	for (zpos = 0; zpos < WINDOWS_NR; zpos++) {
+		type = (zpos == ctx->default_win) ? DRM_PLANE_TYPE_PRIMARY :
+							DRM_PLANE_TYPE_OVERLAY;
+		ret = exynos_plane_init(drm_dev, &ctx->planes[zpos],
+				1 << ctx->pipe, type, zpos);
+		if (ret)
+			return ret;
+	}
+
+	exynos_plane = &ctx->planes[ctx->default_win];
+	ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base,
+					ctx->pipe, EXYNOS_DISPLAY_TYPE_LCD,
+					&decon_crtc_ops, ctx);
+	if (IS_ERR(ctx->crtc)) {
+		ret = PTR_ERR(ctx->crtc);
+		goto err;
+	}
+
+	ret = drm_iommu_attach_device_if_possible(ctx->crtc, drm_dev, dev);
+	if (ret)
+		goto err;
+
+	return ret;
+err:
+	priv->pipe--;
+	return ret;
+}
+
+static void decon_unbind(struct device *dev, struct device *master, void *data)
+{
+	struct decon_context *ctx = dev_get_drvdata(dev);
+
+	decon_disable(ctx->crtc);
+
+	/* detach this sub driver from iommu mapping if supported. */
+	if (is_drm_iommu_supported(ctx->drm_dev))
+		drm_iommu_detach_device(ctx->drm_dev, ctx->dev);
+}
+
+static const struct component_ops decon_component_ops = {
+	.bind	= decon_bind,
+	.unbind = decon_unbind,
+};
+
+static irqreturn_t decon_vsync_irq_handler(int irq, void *dev_id)
+{
+	struct decon_context *ctx = dev_id;
+	u32 val;
+
+	if (!test_bit(BIT_CLKS_ENABLED, &ctx->enabled))
+		goto out;
+
+	val = readl(ctx->addr + DECON_VIDINTCON1);
+	if (val & VIDINTCON1_INTFRMPEND) {
+		drm_handle_vblank(ctx->drm_dev, ctx->pipe);
+
+		/* clear */
+		writel(VIDINTCON1_INTFRMPEND, ctx->addr + DECON_VIDINTCON1);
+	}
+
+out:
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t decon_lcd_sys_irq_handler(int irq, void *dev_id)
+{
+	struct decon_context *ctx = dev_id;
+	u32 val;
+
+	if (!test_bit(BIT_CLKS_ENABLED, &ctx->enabled))
+		goto out;
+
+	val = readl(ctx->addr + DECON_VIDINTCON1);
+	if (val & VIDINTCON1_INTFRMDONEPEND) {
+		exynos_drm_crtc_finish_pageflip(ctx->drm_dev, ctx->pipe);
+
+		/* clear */
+		writel(VIDINTCON1_INTFRMDONEPEND,
+				ctx->addr + DECON_VIDINTCON1);
+	}
+
+out:
+	return IRQ_HANDLED;
+}
+
+static int exynos5433_decon_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct decon_context *ctx;
+	struct resource *res;
+	int ret;
+	int i;
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->default_win = 0;
+	ctx->suspended = true;
+	ctx->dev = dev;
+	if (of_get_child_by_name(dev->of_node, "i80-if-timings"))
+		ctx->i80_if = true;
+
+	for (i = 0; i < ARRAY_SIZE(decon_clks_name); i++) {
+		struct clk *clk;
+
+		clk = devm_clk_get(ctx->dev, decon_clks_name[i]);
+		if (IS_ERR(clk))
+			return PTR_ERR(clk);
+
+		ctx->clks[i] = clk;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(dev, "cannot find IO resource\n");
+		return -ENXIO;
+	}
+
+	ctx->addr = devm_ioremap_resource(dev, res);
+	if (IS_ERR(ctx->addr)) {
+		dev_err(dev, "ioremap failed\n");
+		return PTR_ERR(ctx->addr);
+	}
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
+			ctx->i80_if ? "lcd_sys" : "vsync");
+	if (!res) {
+		dev_err(dev, "cannot find IRQ resource\n");
+		return -ENXIO;
+	}
+
+	ret = devm_request_irq(dev, res->start, ctx->i80_if ?
+			decon_lcd_sys_irq_handler : decon_vsync_irq_handler, 0,
+			"drm_decon", ctx);
+	if (ret < 0) {
+		dev_err(dev, "lcd_sys irq request failed\n");
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, ctx);
+
+	pm_runtime_enable(dev);
+
+	ret = component_add(dev, &decon_component_ops);
+	if (ret)
+		goto err_disable_pm_runtime;
+
+	return 0;
+
+err_disable_pm_runtime:
+	pm_runtime_disable(dev);
+
+	return ret;
+}
+
+static int exynos5433_decon_remove(struct platform_device *pdev)
+{
+	pm_runtime_disable(&pdev->dev);
+
+	component_del(&pdev->dev, &decon_component_ops);
+
+	return 0;
+}
+
+static const struct of_device_id exynos5433_decon_driver_dt_match[] = {
+	{ .compatible = "samsung,exynos5433-decon" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, exynos5433_decon_driver_dt_match);
+
+struct platform_driver exynos5433_decon_driver = {
+	.probe		= exynos5433_decon_probe,
+	.remove		= exynos5433_decon_remove,
+	.driver		= {
+		.name	= "exynos5433-decon",
+		.of_match_table = exynos5433_decon_driver_dt_match,
+	},
+};
-- 
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