1 // SPDX-License-Identifier: GPL-2.0+
2 /* Copyright (C) 2019 Stephan Gerhold */
3
4 #include <common.h>
5 #include <dm.h>
6 #include <log.h>
7 #include <video.h>
8 #include <asm/io.h>
9 #include <linux/bitfield.h>
10 #include <linux/iopoll.h>
11
12 #define MCDE_EXTSRC0A0 0x200
13 #define MCDE_EXTSRC0CONF 0x20C
14 #define MCDE_EXTSRC0CONF_BPP GENMASK(11, 8)
15 #define MCDE_OVL0CONF 0x404
16 #define MCDE_OVL0CONF_PPL GENMASK(10, 0)
17 #define MCDE_OVL0CONF_LPF GENMASK(26, 16)
18 #define MCDE_CHNL0SYNCHMOD 0x608
19 #define MCDE_CHNL0SYNCHMOD_SRC_SYNCH GENMASK(1, 0)
20 #define MCDE_CHNL0SYNCHSW 0x60C
21 #define MCDE_CHNL0SYNCHSW_SW_TRIG BIT(0)
22 #define MCDE_CRA0 0x800
23 #define MCDE_CRA0_FLOEN BIT(0)
24
25 #define MCDE_FLOW_COMPLETION_TIMEOUT 200000 /* us */
26
27 enum mcde_bpp {
28 MCDE_EXTSRC0CONF_BPP_1BPP_PAL,
29 MCDE_EXTSRC0CONF_BPP_2BPP_PAL,
30 MCDE_EXTSRC0CONF_BPP_4BPP_PAL,
31 MCDE_EXTSRC0CONF_BPP_8BPP_PAL,
32 MCDE_EXTSRC0CONF_BPP_RGB444,
33 MCDE_EXTSRC0CONF_BPP_ARGB4444,
34 MCDE_EXTSRC0CONF_BPP_IRGB1555,
35 MCDE_EXTSRC0CONF_BPP_RGB565,
36 MCDE_EXTSRC0CONF_BPP_RGB888,
37 MCDE_EXTSRC0CONF_BPP_XRGB8888,
38 MCDE_EXTSRC0CONF_BPP_ARGB8888,
39 MCDE_EXTSRC0CONF_BPP_YCBCR422,
40 };
41
42 enum mcde_src_synch {
43 MCDE_CHNL0SYNCHMOD_SRC_SYNCH_HARDWARE,
44 MCDE_CHNL0SYNCHMOD_SRC_SYNCH_NO_SYNCH,
45 MCDE_CHNL0SYNCHMOD_SRC_SYNCH_SOFTWARE,
46 };
47
48 struct mcde_simple_priv {
49 fdt_addr_t base;
50 enum mcde_src_synch src_synch;
51 };
52
mcde_simple_probe(struct udevice * dev)53 static int mcde_simple_probe(struct udevice *dev)
54 {
55 struct mcde_simple_priv *priv = dev_get_priv(dev);
56 struct video_uc_plat *plat = dev_get_uclass_plat(dev);
57 struct video_priv *uc_priv = dev_get_uclass_priv(dev);
58 u32 val;
59
60 priv->base = dev_read_addr(dev);
61 if (priv->base == FDT_ADDR_T_NONE)
62 return -EINVAL;
63
64 plat->base = readl(priv->base + MCDE_EXTSRC0A0);
65 if (!plat->base)
66 return -ENODEV;
67
68 val = readl(priv->base + MCDE_OVL0CONF);
69 uc_priv->xsize = FIELD_GET(MCDE_OVL0CONF_PPL, val);
70 uc_priv->ysize = FIELD_GET(MCDE_OVL0CONF_LPF, val);
71 uc_priv->rot = 0;
72
73 val = readl(priv->base + MCDE_EXTSRC0CONF);
74 switch (FIELD_GET(MCDE_EXTSRC0CONF_BPP, val)) {
75 case MCDE_EXTSRC0CONF_BPP_RGB565:
76 uc_priv->bpix = VIDEO_BPP16;
77 break;
78 case MCDE_EXTSRC0CONF_BPP_XRGB8888:
79 case MCDE_EXTSRC0CONF_BPP_ARGB8888:
80 uc_priv->bpix = VIDEO_BPP32;
81 break;
82 default:
83 printf("unsupported format: %#x\n", val);
84 return -EINVAL;
85 }
86
87 val = readl(priv->base + MCDE_CHNL0SYNCHMOD);
88 priv->src_synch = FIELD_GET(MCDE_CHNL0SYNCHMOD_SRC_SYNCH, val);
89
90 plat->size = uc_priv->xsize * uc_priv->ysize * VNBYTES(uc_priv->bpix);
91 debug("MCDE base: %#lx, xsize: %d, ysize: %d, bpp: %d\n",
92 plat->base, uc_priv->xsize, uc_priv->ysize, VNBITS(uc_priv->bpix));
93
94 video_set_flush_dcache(dev, true);
95 return 0;
96 }
97
mcde_simple_video_sync(struct udevice * dev)98 static int mcde_simple_video_sync(struct udevice *dev)
99 {
100 struct mcde_simple_priv *priv = dev_get_priv(dev);
101 unsigned int val;
102
103 if (priv->src_synch != MCDE_CHNL0SYNCHMOD_SRC_SYNCH_SOFTWARE)
104 return 0;
105
106 /* Enable flow */
107 val = readl(priv->base + MCDE_CRA0);
108 val |= MCDE_CRA0_FLOEN;
109 writel(val, priv->base + MCDE_CRA0);
110
111 /* Trigger a software sync */
112 writel(MCDE_CHNL0SYNCHSW_SW_TRIG, priv->base + MCDE_CHNL0SYNCHSW);
113
114 /* Disable flow */
115 val = readl(priv->base + MCDE_CRA0);
116 val &= ~MCDE_CRA0_FLOEN;
117 writel(val, priv->base + MCDE_CRA0);
118
119 /* Wait for completion */
120 return readl_poll_timeout(priv->base + MCDE_CRA0, val,
121 !(val & MCDE_CRA0_FLOEN),
122 MCDE_FLOW_COMPLETION_TIMEOUT);
123 }
124
125 static struct video_ops mcde_simple_ops = {
126 .video_sync = mcde_simple_video_sync,
127 };
128
129 static const struct udevice_id mcde_simple_ids[] = {
130 { .compatible = "ste,mcde" },
131 { }
132 };
133
134 U_BOOT_DRIVER(mcde_simple) = {
135 .name = "mcde_simple",
136 .id = UCLASS_VIDEO,
137 .ops = &mcde_simple_ops,
138 .of_match = mcde_simple_ids,
139 .probe = mcde_simple_probe,
140 .priv_auto = sizeof(struct mcde_simple_priv),
141 };
142