xref: /openbmc/linux/drivers/gpu/drm/sti/sti_cursor.c (revision c819e2cf)
1 /*
2  * Copyright (C) STMicroelectronics SA 2014
3  * Authors: Vincent Abriou <vincent.abriou@st.com>
4  *          Fabien Dessenne <fabien.dessenne@st.com>
5  *          for STMicroelectronics.
6  * License terms:  GNU General Public License (GPL), version 2
7  */
8 #include <drm/drmP.h>
9 
10 #include "sti_cursor.h"
11 #include "sti_layer.h"
12 #include "sti_vtg.h"
13 
14 /* Registers */
15 #define CUR_CTL             0x00
16 #define CUR_VPO             0x0C
17 #define CUR_PML             0x14
18 #define CUR_PMP             0x18
19 #define CUR_SIZE            0x1C
20 #define CUR_CML             0x20
21 #define CUR_AWS             0x28
22 #define CUR_AWE             0x2C
23 
24 #define CUR_CTL_CLUT_UPDATE BIT(1)
25 
26 #define STI_CURS_MIN_SIZE   1
27 #define STI_CURS_MAX_SIZE   128
28 
29 /*
30  * pixmap dma buffer stucture
31  *
32  * @paddr:  physical address
33  * @size:   buffer size
34  * @base:   virtual address
35  */
36 struct dma_pixmap {
37 	dma_addr_t paddr;
38 	size_t size;
39 	void *base;
40 };
41 
42 /**
43  * STI Cursor structure
44  *
45  * @layer:      layer structure
46  * @width:      cursor width
47  * @height:     cursor height
48  * @clut:       color look up table
49  * @clut_paddr: color look up table physical address
50  * @pixmap:     pixmap dma buffer (clut8-format cursor)
51  */
52 struct sti_cursor {
53 	struct sti_layer layer;
54 	unsigned int width;
55 	unsigned int height;
56 	unsigned short *clut;
57 	dma_addr_t clut_paddr;
58 	struct dma_pixmap pixmap;
59 };
60 
61 static const uint32_t cursor_supported_formats[] = {
62 	DRM_FORMAT_ARGB8888,
63 };
64 
65 #define to_sti_cursor(x) container_of(x, struct sti_cursor, layer)
66 
67 static const uint32_t *sti_cursor_get_formats(struct sti_layer *layer)
68 {
69 	return cursor_supported_formats;
70 }
71 
72 static unsigned int sti_cursor_get_nb_formats(struct sti_layer *layer)
73 {
74 	return ARRAY_SIZE(cursor_supported_formats);
75 }
76 
77 static void sti_cursor_argb8888_to_clut8(struct sti_layer *layer)
78 {
79 	struct sti_cursor *cursor = to_sti_cursor(layer);
80 	u32 *src = layer->vaddr;
81 	u8  *dst = cursor->pixmap.base;
82 	unsigned int i, j;
83 	u32 a, r, g, b;
84 
85 	for (i = 0; i < cursor->height; i++) {
86 		for (j = 0; j < cursor->width; j++) {
87 			/* Pick the 2 higher bits of each component */
88 			a = (*src >> 30) & 3;
89 			r = (*src >> 22) & 3;
90 			g = (*src >> 14) & 3;
91 			b = (*src >> 6) & 3;
92 			*dst = a << 6 | r << 4 | g << 2 | b;
93 			src++;
94 			dst++;
95 		}
96 	}
97 }
98 
99 static int sti_cursor_prepare_layer(struct sti_layer *layer, bool first_prepare)
100 {
101 	struct sti_cursor *cursor = to_sti_cursor(layer);
102 	struct drm_display_mode *mode = layer->mode;
103 	u32 y, x;
104 	u32 val;
105 
106 	DRM_DEBUG_DRIVER("\n");
107 
108 	dev_dbg(layer->dev, "%s %s\n", __func__, sti_layer_to_str(layer));
109 
110 	if (layer->src_w < STI_CURS_MIN_SIZE ||
111 	    layer->src_h < STI_CURS_MIN_SIZE ||
112 	    layer->src_w > STI_CURS_MAX_SIZE ||
113 	    layer->src_h > STI_CURS_MAX_SIZE) {
114 		DRM_ERROR("Invalid cursor size (%dx%d)\n",
115 				layer->src_w, layer->src_h);
116 		return -EINVAL;
117 	}
118 
119 	/* If the cursor size has changed, re-allocated the pixmap */
120 	if (!cursor->pixmap.base ||
121 	    (cursor->width != layer->src_w) ||
122 	    (cursor->height != layer->src_h)) {
123 		cursor->width = layer->src_w;
124 		cursor->height = layer->src_h;
125 
126 		if (cursor->pixmap.base)
127 			dma_free_writecombine(layer->dev,
128 					      cursor->pixmap.size,
129 					      cursor->pixmap.base,
130 					      cursor->pixmap.paddr);
131 
132 		cursor->pixmap.size = cursor->width * cursor->height;
133 
134 		cursor->pixmap.base = dma_alloc_writecombine(layer->dev,
135 							cursor->pixmap.size,
136 							&cursor->pixmap.paddr,
137 							GFP_KERNEL | GFP_DMA);
138 		if (!cursor->pixmap.base) {
139 			DRM_ERROR("Failed to allocate memory for pixmap\n");
140 			return -ENOMEM;
141 		}
142 	}
143 
144 	/* Convert ARGB8888 to CLUT8 */
145 	sti_cursor_argb8888_to_clut8(layer);
146 
147 	/* AWS and AWE depend on the mode */
148 	y = sti_vtg_get_line_number(*mode, 0);
149 	x = sti_vtg_get_pixel_number(*mode, 0);
150 	val = y << 16 | x;
151 	writel(val, layer->regs + CUR_AWS);
152 	y = sti_vtg_get_line_number(*mode, mode->vdisplay - 1);
153 	x = sti_vtg_get_pixel_number(*mode, mode->hdisplay - 1);
154 	val = y << 16 | x;
155 	writel(val, layer->regs + CUR_AWE);
156 
157 	if (first_prepare) {
158 		/* Set and fetch CLUT */
159 		writel(cursor->clut_paddr, layer->regs + CUR_CML);
160 		writel(CUR_CTL_CLUT_UPDATE, layer->regs + CUR_CTL);
161 	}
162 
163 	return 0;
164 }
165 
166 static int sti_cursor_commit_layer(struct sti_layer *layer)
167 {
168 	struct sti_cursor *cursor = to_sti_cursor(layer);
169 	struct drm_display_mode *mode = layer->mode;
170 	u32 ydo, xdo;
171 
172 	dev_dbg(layer->dev, "%s %s\n", __func__, sti_layer_to_str(layer));
173 
174 	/* Set memory location, size, and position */
175 	writel(cursor->pixmap.paddr, layer->regs + CUR_PML);
176 	writel(cursor->width, layer->regs + CUR_PMP);
177 	writel(cursor->height << 16 | cursor->width, layer->regs + CUR_SIZE);
178 
179 	ydo = sti_vtg_get_line_number(*mode, layer->dst_y);
180 	xdo = sti_vtg_get_pixel_number(*mode, layer->dst_y);
181 	writel((ydo << 16) | xdo, layer->regs + CUR_VPO);
182 
183 	return 0;
184 }
185 
186 static int sti_cursor_disable_layer(struct sti_layer *layer)
187 {
188 	return 0;
189 }
190 
191 static void sti_cursor_init(struct sti_layer *layer)
192 {
193 	struct sti_cursor *cursor = to_sti_cursor(layer);
194 	unsigned short *base = cursor->clut;
195 	unsigned int a, r, g, b;
196 
197 	/* Assign CLUT values, ARGB444 format */
198 	for (a = 0; a < 4; a++)
199 		for (r = 0; r < 4; r++)
200 			for (g = 0; g < 4; g++)
201 				for (b = 0; b < 4; b++)
202 					*base++ = (a * 5) << 12 |
203 						  (r * 5) << 8 |
204 						  (g * 5) << 4 |
205 						  (b * 5);
206 }
207 
208 static const struct sti_layer_funcs cursor_ops = {
209 	.get_formats = sti_cursor_get_formats,
210 	.get_nb_formats = sti_cursor_get_nb_formats,
211 	.init = sti_cursor_init,
212 	.prepare = sti_cursor_prepare_layer,
213 	.commit = sti_cursor_commit_layer,
214 	.disable = sti_cursor_disable_layer,
215 };
216 
217 struct sti_layer *sti_cursor_create(struct device *dev)
218 {
219 	struct sti_cursor *cursor;
220 
221 	cursor = devm_kzalloc(dev, sizeof(*cursor), GFP_KERNEL);
222 	if (!cursor) {
223 		DRM_ERROR("Failed to allocate memory for cursor\n");
224 		return NULL;
225 	}
226 
227 	/* Allocate clut buffer */
228 	cursor->clut = dma_alloc_writecombine(dev,
229 			0x100 * sizeof(unsigned short),
230 			&cursor->clut_paddr,
231 			GFP_KERNEL | GFP_DMA);
232 
233 	if (!cursor->clut) {
234 		DRM_ERROR("Failed to allocate memory for cursor clut\n");
235 		devm_kfree(dev, cursor);
236 		return NULL;
237 	}
238 
239 	cursor->layer.ops = &cursor_ops;
240 
241 	return (struct sti_layer *)cursor;
242 }
243