drm/mediatek: Add DRM Driver for Mediatek SoC MT8173.

This patch adds an initial DRM driver for the Mediatek MT8173 DISP
subsystem. It currently supports two fixed output streams from the
OVL0/OVL1 sources to the DSI0/DPI0 sinks, respectively.

Signed-off-by: CK Hu <ck.hu@mediatek.com>
Signed-off-by: YT Shen <yt.shen@mediatek.com>
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com>
Signed-off-by: Mao Huang <littlecvr@chromium.org>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

1 files changed, 353 insertions, 0 deletions

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
new file mode 100644
index 000000000000..17ba9355a49c
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
@@ -0,0 +1,353 @@
+/*
+ * Copyright (c) 2015 MediaTek Inc.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include "mtk_drm_ddp.h"
+#include "mtk_drm_ddp_comp.h"
+
+#define DISP_REG_CONFIG_DISP_OVL0_MOUT_EN	0x040
+#define DISP_REG_CONFIG_DISP_OVL1_MOUT_EN	0x044
+#define DISP_REG_CONFIG_DISP_OD_MOUT_EN		0x048
+#define DISP_REG_CONFIG_DISP_GAMMA_MOUT_EN	0x04c
+#define DISP_REG_CONFIG_DISP_UFOE_MOUT_EN	0x050
+#define DISP_REG_CONFIG_DISP_COLOR0_SEL_IN	0x084
+#define DISP_REG_CONFIG_DISP_COLOR1_SEL_IN	0x088
+#define DISP_REG_CONFIG_DPI_SEL_IN		0x0ac
+#define DISP_REG_CONFIG_DISP_RDMA1_MOUT_EN	0x0c8
+#define DISP_REG_CONFIG_MMSYS_CG_CON0		0x100
+
+#define DISP_REG_MUTEX_EN(n)	(0x20 + 0x20 * (n))
+#define DISP_REG_MUTEX_RST(n)	(0x28 + 0x20 * (n))
+#define DISP_REG_MUTEX_MOD(n)	(0x2c + 0x20 * (n))
+#define DISP_REG_MUTEX_SOF(n)	(0x30 + 0x20 * (n))
+
+#define MUTEX_MOD_DISP_OVL0		BIT(11)
+#define MUTEX_MOD_DISP_OVL1		BIT(12)
+#define MUTEX_MOD_DISP_RDMA0		BIT(13)
+#define MUTEX_MOD_DISP_RDMA1		BIT(14)
+#define MUTEX_MOD_DISP_RDMA2		BIT(15)
+#define MUTEX_MOD_DISP_WDMA0		BIT(16)
+#define MUTEX_MOD_DISP_WDMA1		BIT(17)
+#define MUTEX_MOD_DISP_COLOR0		BIT(18)
+#define MUTEX_MOD_DISP_COLOR1		BIT(19)
+#define MUTEX_MOD_DISP_AAL		BIT(20)
+#define MUTEX_MOD_DISP_GAMMA		BIT(21)
+#define MUTEX_MOD_DISP_UFOE		BIT(22)
+#define MUTEX_MOD_DISP_PWM0		BIT(23)
+#define MUTEX_MOD_DISP_PWM1		BIT(24)
+#define MUTEX_MOD_DISP_OD		BIT(25)
+
+#define MUTEX_SOF_SINGLE_MODE		0
+#define MUTEX_SOF_DSI0			1
+#define MUTEX_SOF_DSI1			2
+#define MUTEX_SOF_DPI0			3
+
+#define OVL0_MOUT_EN_COLOR0		0x1
+#define OD_MOUT_EN_RDMA0		0x1
+#define UFOE_MOUT_EN_DSI0		0x1
+#define COLOR0_SEL_IN_OVL0		0x1
+#define OVL1_MOUT_EN_COLOR1		0x1
+#define GAMMA_MOUT_EN_RDMA1		0x1
+#define RDMA1_MOUT_DPI0			0x2
+#define DPI0_SEL_IN_RDMA1		0x1
+#define COLOR1_SEL_IN_OVL1		0x1
+
+struct mtk_disp_mutex {
+	int id;
+	bool claimed;
+};
+
+struct mtk_ddp {
+	struct device			*dev;
+	struct clk			*clk;
+	void __iomem			*regs;
+	struct mtk_disp_mutex		mutex[10];
+};
+
+static const unsigned int mutex_mod[DDP_COMPONENT_ID_MAX] = {
+	[DDP_COMPONENT_AAL] = MUTEX_MOD_DISP_AAL,
+	[DDP_COMPONENT_COLOR0] = MUTEX_MOD_DISP_COLOR0,
+	[DDP_COMPONENT_COLOR1] = MUTEX_MOD_DISP_COLOR1,
+	[DDP_COMPONENT_GAMMA] = MUTEX_MOD_DISP_GAMMA,
+	[DDP_COMPONENT_OD] = MUTEX_MOD_DISP_OD,
+	[DDP_COMPONENT_OVL0] = MUTEX_MOD_DISP_OVL0,
+	[DDP_COMPONENT_OVL1] = MUTEX_MOD_DISP_OVL1,
+	[DDP_COMPONENT_PWM0] = MUTEX_MOD_DISP_PWM0,
+	[DDP_COMPONENT_PWM1] = MUTEX_MOD_DISP_PWM1,
+	[DDP_COMPONENT_RDMA0] = MUTEX_MOD_DISP_RDMA0,
+	[DDP_COMPONENT_RDMA1] = MUTEX_MOD_DISP_RDMA1,
+	[DDP_COMPONENT_RDMA2] = MUTEX_MOD_DISP_RDMA2,
+	[DDP_COMPONENT_UFOE] = MUTEX_MOD_DISP_UFOE,
+	[DDP_COMPONENT_WDMA0] = MUTEX_MOD_DISP_WDMA0,
+	[DDP_COMPONENT_WDMA1] = MUTEX_MOD_DISP_WDMA1,
+};
+
+static unsigned int mtk_ddp_mout_en(enum mtk_ddp_comp_id cur,
+				    enum mtk_ddp_comp_id next,
+				    unsigned int *addr)
+{
+	unsigned int value;
+
+	if (cur == DDP_COMPONENT_OVL0 && next == DDP_COMPONENT_COLOR0) {
+		*addr = DISP_REG_CONFIG_DISP_OVL0_MOUT_EN;
+		value = OVL0_MOUT_EN_COLOR0;
+	} else if (cur == DDP_COMPONENT_OD && next == DDP_COMPONENT_RDMA0) {
+		*addr = DISP_REG_CONFIG_DISP_OD_MOUT_EN;
+		value = OD_MOUT_EN_RDMA0;
+	} else if (cur == DDP_COMPONENT_UFOE && next == DDP_COMPONENT_DSI0) {
+		*addr = DISP_REG_CONFIG_DISP_UFOE_MOUT_EN;
+		value = UFOE_MOUT_EN_DSI0;
+	} else if (cur == DDP_COMPONENT_OVL1 && next == DDP_COMPONENT_COLOR1) {
+		*addr = DISP_REG_CONFIG_DISP_OVL1_MOUT_EN;
+		value = OVL1_MOUT_EN_COLOR1;
+	} else if (cur == DDP_COMPONENT_GAMMA && next == DDP_COMPONENT_RDMA1) {
+		*addr = DISP_REG_CONFIG_DISP_GAMMA_MOUT_EN;
+		value = GAMMA_MOUT_EN_RDMA1;
+	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DPI0) {
+		*addr = DISP_REG_CONFIG_DISP_RDMA1_MOUT_EN;
+		value = RDMA1_MOUT_DPI0;
+	} else {
+		value = 0;
+	}
+
+	return value;
+}
+
+static unsigned int mtk_ddp_sel_in(enum mtk_ddp_comp_id cur,
+				   enum mtk_ddp_comp_id next,
+				   unsigned int *addr)
+{
+	unsigned int value;
+
+	if (cur == DDP_COMPONENT_OVL0 && next == DDP_COMPONENT_COLOR0) {
+		*addr = DISP_REG_CONFIG_DISP_COLOR0_SEL_IN;
+		value = COLOR0_SEL_IN_OVL0;
+	} else if (cur == DDP_COMPONENT_RDMA1 && next == DDP_COMPONENT_DPI0) {
+		*addr = DISP_REG_CONFIG_DPI_SEL_IN;
+		value = DPI0_SEL_IN_RDMA1;
+	} else if (cur == DDP_COMPONENT_OVL1 && next == DDP_COMPONENT_COLOR1) {
+		*addr = DISP_REG_CONFIG_DISP_COLOR1_SEL_IN;
+		value = COLOR1_SEL_IN_OVL1;
+	} else {
+		value = 0;
+	}
+
+	return value;
+}
+
+void mtk_ddp_add_comp_to_path(void __iomem *config_regs,
+			      enum mtk_ddp_comp_id cur,
+			      enum mtk_ddp_comp_id next)
+{
+	unsigned int addr, value, reg;
+
+	value = mtk_ddp_mout_en(cur, next, &addr);
+	if (value) {
+		reg = readl_relaxed(config_regs + addr) | value;
+		writel_relaxed(reg, config_regs + addr);
+	}
+
+	value = mtk_ddp_sel_in(cur, next, &addr);
+	if (value) {
+		reg = readl_relaxed(config_regs + addr) | value;
+		writel_relaxed(reg, config_regs + addr);
+	}
+}
+
+void mtk_ddp_remove_comp_from_path(void __iomem *config_regs,
+				   enum mtk_ddp_comp_id cur,
+				   enum mtk_ddp_comp_id next)
+{
+	unsigned int addr, value, reg;
+
+	value = mtk_ddp_mout_en(cur, next, &addr);
+	if (value) {
+		reg = readl_relaxed(config_regs + addr) & ~value;
+		writel_relaxed(reg, config_regs + addr);
+	}
+
+	value = mtk_ddp_sel_in(cur, next, &addr);
+	if (value) {
+		reg = readl_relaxed(config_regs + addr) & ~value;
+		writel_relaxed(reg, config_regs + addr);
+	}
+}
+
+struct mtk_disp_mutex *mtk_disp_mutex_get(struct device *dev, unsigned int id)
+{
+	struct mtk_ddp *ddp = dev_get_drvdata(dev);
+
+	if (id >= 10)
+		return ERR_PTR(-EINVAL);
+	if (ddp->mutex[id].claimed)
+		return ERR_PTR(-EBUSY);
+
+	ddp->mutex[id].claimed = true;
+
+	return &ddp->mutex[id];
+}
+
+void mtk_disp_mutex_put(struct mtk_disp_mutex *mutex)
+{
+	struct mtk_ddp *ddp = container_of(mutex, struct mtk_ddp,
+					   mutex[mutex->id]);
+
+	WARN_ON(&ddp->mutex[mutex->id] != mutex);
+
+	mutex->claimed = false;
+}
+
+int mtk_disp_mutex_prepare(struct mtk_disp_mutex *mutex)
+{
+	struct mtk_ddp *ddp = container_of(mutex, struct mtk_ddp,
+					   mutex[mutex->id]);
+	return clk_prepare_enable(ddp->clk);
+}
+
+void mtk_disp_mutex_unprepare(struct mtk_disp_mutex *mutex)
+{
+	struct mtk_ddp *ddp = container_of(mutex, struct mtk_ddp,
+					   mutex[mutex->id]);
+	clk_disable_unprepare(ddp->clk);
+}
+
+void mtk_disp_mutex_add_comp(struct mtk_disp_mutex *mutex,
+			     enum mtk_ddp_comp_id id)
+{
+	struct mtk_ddp *ddp = container_of(mutex, struct mtk_ddp,
+					   mutex[mutex->id]);
+	unsigned int reg;
+
+	WARN_ON(&ddp->mutex[mutex->id] != mutex);
+
+	switch (id) {
+	case DDP_COMPONENT_DSI0:
+		reg = MUTEX_SOF_DSI0;
+		break;
+	case DDP_COMPONENT_DSI1:
+		reg = MUTEX_SOF_DSI0;
+		break;
+	case DDP_COMPONENT_DPI0:
+		reg = MUTEX_SOF_DPI0;
+		break;
+	default:
+		reg = readl_relaxed(ddp->regs + DISP_REG_MUTEX_MOD(mutex->id));
+		reg |= mutex_mod[id];
+		writel_relaxed(reg, ddp->regs + DISP_REG_MUTEX_MOD(mutex->id));
+		return;
+	}
+
+	writel_relaxed(reg, ddp->regs + DISP_REG_MUTEX_SOF(mutex->id));
+}
+
+void mtk_disp_mutex_remove_comp(struct mtk_disp_mutex *mutex,
+				enum mtk_ddp_comp_id id)
+{
+	struct mtk_ddp *ddp = container_of(mutex, struct mtk_ddp,
+					   mutex[mutex->id]);
+	unsigned int reg;
+
+	WARN_ON(&ddp->mutex[mutex->id] != mutex);
+
+	switch (id) {
+	case DDP_COMPONENT_DSI0:
+	case DDP_COMPONENT_DSI1:
+	case DDP_COMPONENT_DPI0:
+		writel_relaxed(MUTEX_SOF_SINGLE_MODE,
+			       ddp->regs + DISP_REG_MUTEX_SOF(mutex->id));
+		break;
+	default:
+		reg = readl_relaxed(ddp->regs + DISP_REG_MUTEX_MOD(mutex->id));
+		reg &= ~mutex_mod[id];
+		writel_relaxed(reg, ddp->regs + DISP_REG_MUTEX_MOD(mutex->id));
+		break;
+	}
+}
+
+void mtk_disp_mutex_enable(struct mtk_disp_mutex *mutex)
+{
+	struct mtk_ddp *ddp = container_of(mutex, struct mtk_ddp,
+					   mutex[mutex->id]);
+
+	WARN_ON(&ddp->mutex[mutex->id] != mutex);
+
+	writel(1, ddp->regs + DISP_REG_MUTEX_EN(mutex->id));
+}
+
+void mtk_disp_mutex_disable(struct mtk_disp_mutex *mutex)
+{
+	struct mtk_ddp *ddp = container_of(mutex, struct mtk_ddp,
+					   mutex[mutex->id]);
+
+	WARN_ON(&ddp->mutex[mutex->id] != mutex);
+
+	writel(0, ddp->regs + DISP_REG_MUTEX_EN(mutex->id));
+}
+
+static int mtk_ddp_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct mtk_ddp *ddp;
+	struct resource *regs;
+	int i;
+
+	ddp = devm_kzalloc(dev, sizeof(*ddp), GFP_KERNEL);
+	if (!ddp)
+		return -ENOMEM;
+
+	for (i = 0; i < 10; i++)
+		ddp->mutex[i].id = i;
+
+	ddp->clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(ddp->clk)) {
+		dev_err(dev, "Failed to get clock\n");
+		return PTR_ERR(ddp->clk);
+	}
+
+	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	ddp->regs = devm_ioremap_resource(dev, regs);
+	if (IS_ERR(ddp->regs)) {
+		dev_err(dev, "Failed to map mutex registers\n");
+		return PTR_ERR(ddp->regs);
+	}
+
+	platform_set_drvdata(pdev, ddp);
+
+	return 0;
+}
+
+static int mtk_ddp_remove(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static const struct of_device_id ddp_driver_dt_match[] = {
+	{ .compatible = "mediatek,mt8173-disp-mutex" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, ddp_driver_dt_match);
+
+struct platform_driver mtk_ddp_driver = {
+	.probe		= mtk_ddp_probe,
+	.remove		= mtk_ddp_remove,
+	.driver		= {
+		.name	= "mediatek-ddp",
+		.owner	= THIS_MODULE,
+		.of_match_table = ddp_driver_dt_match,
+	},
+};