drm: Renesas SH Mobile DRM driver

The SH Mobile LCD controller (LCDC) DRM driver supports the main
graphics plane in RGB and YUV formats, as well as the overlay planes (in
alpha-blending mode only).

Only flat panel outputs using the parallel interface are supported.
Support for SYS panels, HDMI and DSI is currently not implemented.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 268 insertions, 0 deletions

diff --git a/drivers/gpu/drm/shmobile/shmob_drm_plane.c b/drivers/gpu/drm/shmobile/shmob_drm_plane.c
new file mode 100644
index 000000000000..e1eb899b0288
--- /dev/null
+++ b/drivers/gpu/drm/shmobile/shmob_drm_plane.c
@@ -0,0 +1,268 @@
+/*
+ * shmob_drm_plane.c  --  SH Mobile DRM Planes
+ *
+ * Copyright (C) 2012 Renesas Corporation
+ *
+ * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+
+#include <video/sh_mobile_meram.h>
+
+#include "shmob_drm_drv.h"
+#include "shmob_drm_kms.h"
+#include "shmob_drm_plane.h"
+#include "shmob_drm_regs.h"
+
+struct shmob_drm_plane {
+	struct drm_plane plane;
+	unsigned int index;
+	unsigned int alpha;
+
+	const struct shmob_drm_format_info *format;
+	unsigned long dma[2];
+
+	unsigned int src_x;
+	unsigned int src_y;
+	unsigned int crtc_x;
+	unsigned int crtc_y;
+	unsigned int crtc_w;
+	unsigned int crtc_h;
+};
+
+#define to_shmob_plane(p)	container_of(p, struct shmob_drm_plane, plane)
+
+static void shmob_drm_plane_compute_base(struct shmob_drm_plane *splane,
+					 struct drm_framebuffer *fb,
+					 int x, int y)
+{
+	struct drm_gem_cma_object *gem;
+	unsigned int bpp;
+
+	bpp = splane->format->yuv ? 8 : splane->format->bpp;
+	gem = drm_fb_cma_get_gem_obj(fb, 0);
+	splane->dma[0] = gem->paddr + fb->offsets[0]
+		       + y * fb->pitches[0] + x * bpp / 8;
+
+	if (splane->format->yuv) {
+		bpp = splane->format->bpp - 8;
+		gem = drm_fb_cma_get_gem_obj(fb, 1);
+		splane->dma[1] = gem->paddr + fb->offsets[1]
+			       + y / (bpp == 4 ? 2 : 1) * fb->pitches[1]
+			       + x * (bpp == 16 ? 2 : 1);
+	}
+}
+
+static void __shmob_drm_plane_setup(struct shmob_drm_plane *splane,
+				    struct drm_framebuffer *fb)
+{
+	struct shmob_drm_device *sdev = splane->plane.dev->dev_private;
+	u32 format;
+
+	/* TODO: Support ROP3 mode */
+	format = LDBBSIFR_EN | (splane->alpha << LDBBSIFR_LAY_SHIFT);
+
+	switch (splane->format->fourcc) {
+	case DRM_FORMAT_RGB565:
+	case DRM_FORMAT_NV21:
+	case DRM_FORMAT_NV61:
+	case DRM_FORMAT_NV42:
+		format |= LDBBSIFR_SWPL | LDBBSIFR_SWPW;
+		break;
+	case DRM_FORMAT_RGB888:
+	case DRM_FORMAT_NV12:
+	case DRM_FORMAT_NV16:
+	case DRM_FORMAT_NV24:
+		format |= LDBBSIFR_SWPL | LDBBSIFR_SWPW | LDBBSIFR_SWPB;
+		break;
+	case DRM_FORMAT_ARGB8888:
+	default:
+		format |= LDBBSIFR_SWPL;
+		break;
+	}
+
+	switch (splane->format->fourcc) {
+	case DRM_FORMAT_RGB565:
+		format |= LDBBSIFR_AL_1 | LDBBSIFR_RY | LDBBSIFR_RPKF_RGB16;
+		break;
+	case DRM_FORMAT_RGB888:
+		format |= LDBBSIFR_AL_1 | LDBBSIFR_RY | LDBBSIFR_RPKF_RGB24;
+		break;
+	case DRM_FORMAT_ARGB8888:
+		format |= LDBBSIFR_AL_PK | LDBBSIFR_RY | LDDFR_PKF_ARGB32;
+		break;
+	case DRM_FORMAT_NV12:
+	case DRM_FORMAT_NV21:
+		format |= LDBBSIFR_AL_1 | LDBBSIFR_CHRR_420;
+		break;
+	case DRM_FORMAT_NV16:
+	case DRM_FORMAT_NV61:
+		format |= LDBBSIFR_AL_1 | LDBBSIFR_CHRR_422;
+		break;
+	case DRM_FORMAT_NV24:
+	case DRM_FORMAT_NV42:
+		format |= LDBBSIFR_AL_1 | LDBBSIFR_CHRR_444;
+		break;
+	}
+
+#define plane_reg_dump(sdev, splane, reg) \
+	dev_dbg(sdev->ddev->dev, "%s(%u): %s 0x%08x 0x%08x\n", __func__, \
+		splane->index, #reg, \
+		lcdc_read(sdev, reg(splane->index)), \
+		lcdc_read(sdev, reg(splane->index) + LCDC_SIDE_B_OFFSET))
+
+	plane_reg_dump(sdev, splane, LDBnBSIFR);
+	plane_reg_dump(sdev, splane, LDBnBSSZR);
+	plane_reg_dump(sdev, splane, LDBnBLOCR);
+	plane_reg_dump(sdev, splane, LDBnBSMWR);
+	plane_reg_dump(sdev, splane, LDBnBSAYR);
+	plane_reg_dump(sdev, splane, LDBnBSACR);
+
+	lcdc_write(sdev, LDBCR, LDBCR_UPC(splane->index));
+	dev_dbg(sdev->ddev->dev, "%s(%u): %s 0x%08x\n", __func__, splane->index,
+		"LDBCR", lcdc_read(sdev, LDBCR));
+
+	lcdc_write(sdev, LDBnBSIFR(splane->index), format);
+
+	lcdc_write(sdev, LDBnBSSZR(splane->index),
+		   (splane->crtc_h << LDBBSSZR_BVSS_SHIFT) |
+		   (splane->crtc_w << LDBBSSZR_BHSS_SHIFT));
+	lcdc_write(sdev, LDBnBLOCR(splane->index),
+		   (splane->crtc_y << LDBBLOCR_CVLC_SHIFT) |
+		   (splane->crtc_x << LDBBLOCR_CHLC_SHIFT));
+	lcdc_write(sdev, LDBnBSMWR(splane->index),
+		   fb->pitches[0] << LDBBSMWR_BSMW_SHIFT);
+
+	shmob_drm_plane_compute_base(splane, fb, splane->src_x, splane->src_y);
+
+	lcdc_write(sdev, LDBnBSAYR(splane->index), splane->dma[0]);
+	if (splane->format->yuv)
+		lcdc_write(sdev, LDBnBSACR(splane->index), splane->dma[1]);
+
+	lcdc_write(sdev, LDBCR,
+		   LDBCR_UPF(splane->index) | LDBCR_UPD(splane->index));
+	dev_dbg(sdev->ddev->dev, "%s(%u): %s 0x%08x\n", __func__, splane->index,
+		"LDBCR", lcdc_read(sdev, LDBCR));
+
+	plane_reg_dump(sdev, splane, LDBnBSIFR);
+	plane_reg_dump(sdev, splane, LDBnBSSZR);
+	plane_reg_dump(sdev, splane, LDBnBLOCR);
+	plane_reg_dump(sdev, splane, LDBnBSMWR);
+	plane_reg_dump(sdev, splane, LDBnBSAYR);
+	plane_reg_dump(sdev, splane, LDBnBSACR);
+}
+
+void shmob_drm_plane_setup(struct drm_plane *plane)
+{
+	struct shmob_drm_plane *splane = to_shmob_plane(plane);
+
+	if (plane->fb == NULL || !plane->enabled)
+		return;
+
+	__shmob_drm_plane_setup(splane, plane->fb);
+}
+
+static int
+shmob_drm_plane_update(struct drm_plane *plane, struct drm_crtc *crtc,
+		       struct drm_framebuffer *fb, int crtc_x, int crtc_y,
+		       unsigned int crtc_w, unsigned int crtc_h,
+		       uint32_t src_x, uint32_t src_y,
+		       uint32_t src_w, uint32_t src_h)
+{
+	struct shmob_drm_plane *splane = to_shmob_plane(plane);
+	struct shmob_drm_device *sdev = plane->dev->dev_private;
+	const struct shmob_drm_format_info *format;
+
+	format = shmob_drm_format_info(fb->pixel_format);
+	if (format == NULL) {
+		dev_dbg(sdev->dev, "update_plane: unsupported format %08x\n",
+			fb->pixel_format);
+		return -EINVAL;
+	}
+
+	if (src_w >> 16 != crtc_w || src_h >> 16 != crtc_h) {
+		dev_dbg(sdev->dev, "%s: scaling not supported\n", __func__);
+		return -EINVAL;
+	}
+
+	splane->format = format;
+
+	splane->src_x = src_x >> 16;
+	splane->src_y = src_y >> 16;
+	splane->crtc_x = crtc_x;
+	splane->crtc_y = crtc_y;
+	splane->crtc_w = crtc_w;
+	splane->crtc_h = crtc_h;
+
+	__shmob_drm_plane_setup(splane, fb);
+	return 0;
+}
+
+static int shmob_drm_plane_disable(struct drm_plane *plane)
+{
+	struct shmob_drm_plane *splane = to_shmob_plane(plane);
+	struct shmob_drm_device *sdev = plane->dev->dev_private;
+
+	splane->format = NULL;
+
+	lcdc_write(sdev, LDBnBSIFR(splane->index), 0);
+	return 0;
+}
+
+static void shmob_drm_plane_destroy(struct drm_plane *plane)
+{
+	struct shmob_drm_plane *splane = to_shmob_plane(plane);
+
+	shmob_drm_plane_disable(plane);
+	drm_plane_cleanup(plane);
+	kfree(splane);
+}
+
+static const struct drm_plane_funcs shmob_drm_plane_funcs = {
+	.update_plane = shmob_drm_plane_update,
+	.disable_plane = shmob_drm_plane_disable,
+	.destroy = shmob_drm_plane_destroy,
+};
+
+static const uint32_t formats[] = {
+	DRM_FORMAT_RGB565,
+	DRM_FORMAT_RGB888,
+	DRM_FORMAT_ARGB8888,
+	DRM_FORMAT_NV12,
+	DRM_FORMAT_NV21,
+	DRM_FORMAT_NV16,
+	DRM_FORMAT_NV61,
+	DRM_FORMAT_NV24,
+	DRM_FORMAT_NV42,
+};
+
+int shmob_drm_plane_create(struct shmob_drm_device *sdev, unsigned int index)
+{
+	struct shmob_drm_plane *splane;
+	int ret;
+
+	splane = kzalloc(sizeof(*splane), GFP_KERNEL);
+	if (splane == NULL)
+		return -ENOMEM;
+
+	splane->index = index;
+	splane->alpha = 255;
+
+	ret = drm_plane_init(sdev->ddev, &splane->plane, 1,
+			     &shmob_drm_plane_funcs, formats,
+			     ARRAY_SIZE(formats), false);
+	if (ret < 0)
+		kfree(splane);
+
+	return ret;
+}