--- /dev/null
+/*
+ * Copyright (C) STMicroelectronics SA 2014
+ * Authors: Vincent Abriou <vincent.abriou@st.com>
+ * Fabien Dessenne <fabien.dessenne@st.com>
+ * for STMicroelectronics.
+ * License terms: GNU General Public License (GPL), version 2
+ */
+#include <drm/drmP.h>
+
+#include "sti_cursor.h"
+#include "sti_layer.h"
+#include "sti_vtg.h"
+
+/* Registers */
+#define CUR_CTL 0x00
+#define CUR_VPO 0x0C
+#define CUR_PML 0x14
+#define CUR_PMP 0x18
+#define CUR_SIZE 0x1C
+#define CUR_CML 0x20
+#define CUR_AWS 0x28
+#define CUR_AWE 0x2C
+
+#define CUR_CTL_CLUT_UPDATE BIT(1)
+
+#define STI_CURS_MIN_SIZE 1
+#define STI_CURS_MAX_SIZE 128
+
+/*
+ * pixmap dma buffer stucture
+ *
+ * @paddr: physical address
+ * @size: buffer size
+ * @base: virtual address
+ */
+struct dma_pixmap {
+ dma_addr_t paddr;
+ size_t size;
+ void *base;
+};
+
+/**
+ * STI Cursor structure
+ *
+ * @layer: layer structure
+ * @width: cursor width
+ * @height: cursor height
+ * @clut: color look up table
+ * @clut_paddr: color look up table physical address
+ * @pixmap: pixmap dma buffer (clut8-format cursor)
+ */
+struct sti_cursor {
+ struct sti_layer layer;
+ unsigned int width;
+ unsigned int height;
+ unsigned short *clut;
+ dma_addr_t clut_paddr;
+ struct dma_pixmap pixmap;
+};
+
+static const uint32_t cursor_supported_formats[] = {
+ DRM_FORMAT_ARGB8888,
+};
+
+#define to_sti_cursor(x) container_of(x, struct sti_cursor, layer)
+
+static const uint32_t *sti_cursor_get_formats(struct sti_layer *layer)
+{
+ return cursor_supported_formats;
+}
+
+static unsigned int sti_cursor_get_nb_formats(struct sti_layer *layer)
+{
+ return ARRAY_SIZE(cursor_supported_formats);
+}
+
+static void sti_cursor_argb8888_to_clut8(struct sti_layer *layer)
+{
+ struct sti_cursor *cursor = to_sti_cursor(layer);
+ u32 *src = layer->vaddr;
+ u8 *dst = cursor->pixmap.base;
+ unsigned int i, j;
+ u32 a, r, g, b;
+
+ for (i = 0; i < cursor->height; i++) {
+ for (j = 0; j < cursor->width; j++) {
+ /* Pick the 2 higher bits of each component */
+ a = (*src >> 30) & 3;
+ r = (*src >> 22) & 3;
+ g = (*src >> 14) & 3;
+ b = (*src >> 6) & 3;
+ *dst = a << 6 | r << 4 | g << 2 | b;
+ src++;
+ dst++;
+ }
+ }
+}
+
+static int sti_cursor_prepare_layer(struct sti_layer *layer, bool first_prepare)
+{
+ struct sti_cursor *cursor = to_sti_cursor(layer);
+ struct drm_display_mode *mode = layer->mode;
+ u32 y, x;
+ u32 val;
+
+ DRM_DEBUG_DRIVER("\n");
+
+ dev_dbg(layer->dev, "%s %s\n", __func__, sti_layer_to_str(layer));
+
+ if (layer->src_w < STI_CURS_MIN_SIZE ||
+ layer->src_h < STI_CURS_MIN_SIZE ||
+ layer->src_w > STI_CURS_MAX_SIZE ||
+ layer->src_h > STI_CURS_MAX_SIZE) {
+ DRM_ERROR("Invalid cursor size (%dx%d)\n",
+ layer->src_w, layer->src_h);
+ return -EINVAL;
+ }
+
+ /* If the cursor size has changed, re-allocated the pixmap */
+ if (!cursor->pixmap.base ||
+ (cursor->width != layer->src_w) ||
+ (cursor->height != layer->src_h)) {
+ cursor->width = layer->src_w;
+ cursor->height = layer->src_h;
+
+ if (cursor->pixmap.base)
+ dma_free_writecombine(layer->dev,
+ cursor->pixmap.size,
+ cursor->pixmap.base,
+ cursor->pixmap.paddr);
+
+ cursor->pixmap.size = cursor->width * cursor->height;
+
+ cursor->pixmap.base = dma_alloc_writecombine(layer->dev,
+ cursor->pixmap.size,
+ &cursor->pixmap.paddr,
+ GFP_KERNEL | GFP_DMA);
+ if (!cursor->pixmap.base) {
+ DRM_ERROR("Failed to allocate memory for pixmap\n");
+ return -ENOMEM;
+ }
+ }
+
+ /* Convert ARGB8888 to CLUT8 */
+ sti_cursor_argb8888_to_clut8(layer);
+
+ /* AWS and AWE depend on the mode */
+ y = sti_vtg_get_line_number(*mode, 0);
+ x = sti_vtg_get_pixel_number(*mode, 0);
+ val = y << 16 | x;
+ writel(val, layer->regs + CUR_AWS);
+ y = sti_vtg_get_line_number(*mode, mode->vdisplay - 1);
+ x = sti_vtg_get_pixel_number(*mode, mode->hdisplay - 1);
+ val = y << 16 | x;
+ writel(val, layer->regs + CUR_AWE);
+
+ if (first_prepare) {
+ /* Set and fetch CLUT */
+ writel(cursor->clut_paddr, layer->regs + CUR_CML);
+ writel(CUR_CTL_CLUT_UPDATE, layer->regs + CUR_CTL);
+ }
+
+ return 0;
+}
+
+static int sti_cursor_commit_layer(struct sti_layer *layer)
+{
+ struct sti_cursor *cursor = to_sti_cursor(layer);
+ struct drm_display_mode *mode = layer->mode;
+ u32 ydo, xdo;
+
+ dev_dbg(layer->dev, "%s %s\n", __func__, sti_layer_to_str(layer));
+
+ /* Set memory location, size, and position */
+ writel(cursor->pixmap.paddr, layer->regs + CUR_PML);
+ writel(cursor->width, layer->regs + CUR_PMP);
+ writel(cursor->height << 16 | cursor->width, layer->regs + CUR_SIZE);
+
+ ydo = sti_vtg_get_line_number(*mode, layer->dst_y);
+ xdo = sti_vtg_get_pixel_number(*mode, layer->dst_y);
+ writel((ydo << 16) | xdo, layer->regs + CUR_VPO);
+
+ return 0;
+}
+
+static int sti_cursor_disable_layer(struct sti_layer *layer)
+{
+ return 0;
+}
+
+static void sti_cursor_init(struct sti_layer *layer)
+{
+ struct sti_cursor *cursor = to_sti_cursor(layer);
+ unsigned short *base = cursor->clut;
+ unsigned int a, r, g, b;
+
+ /* Assign CLUT values, ARGB444 format */
+ for (a = 0; a < 4; a++)
+ for (r = 0; r < 4; r++)
+ for (g = 0; g < 4; g++)
+ for (b = 0; b < 4; b++)
+ *base++ = (a * 5) << 12 |
+ (r * 5) << 8 |
+ (g * 5) << 4 |
+ (b * 5);
+}
+
+static const struct sti_layer_funcs cursor_ops = {
+ .get_formats = sti_cursor_get_formats,
+ .get_nb_formats = sti_cursor_get_nb_formats,
+ .init = sti_cursor_init,
+ .prepare = sti_cursor_prepare_layer,
+ .commit = sti_cursor_commit_layer,
+ .disable = sti_cursor_disable_layer,
+};
+
+struct sti_layer *sti_cursor_create(struct device *dev)
+{
+ struct sti_cursor *cursor;
+
+ cursor = devm_kzalloc(dev, sizeof(*cursor), GFP_KERNEL);
+ if (!cursor) {
+ DRM_ERROR("Failed to allocate memory for cursor\n");
+ return NULL;
+ }
+
+ /* Allocate clut buffer */
+ cursor->clut = dma_alloc_writecombine(dev,
+ 0x100 * sizeof(unsigned short),
+ &cursor->clut_paddr,
+ GFP_KERNEL | GFP_DMA);
+
+ if (!cursor->clut) {
+ DRM_ERROR("Failed to allocate memory for cursor clut\n");
+ devm_kfree(dev, cursor);
+ return NULL;
+ }
+
+ cursor->layer.ops = &cursor_ops;
+
+ return (struct sti_layer *)cursor;
+}
projects / GitHub / MotorolaMobilityLLC / kernel-slsi.git / commitdiff