summaryrefslogtreecommitdiff
path: root/drivers/video/am335x-fb.c
blob: e23d1720018f8820a3d963c943c8a5ebc025f62c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
/*
 * Copyright (C) 2013 Hannes Schmelzer <oe5hpm@oevsv.at>
 * Bernecker & Rainer Industrieelektronik GmbH - http://www.br-automation.com
 *
 * minimal framebuffer driver for TI's AM335x SoC to be compatible with
 * Wolfgang Denk's LCD-Framework (CONFIG_LCD, common/lcd.c)
 *
 * - supporting only 24bit RGB/TFT raster Mode (not using palette)
 * - sets up LCD controller as in 'am335x_lcdpanel' struct given
 * - starts output DMA from gd->fb_base buffer
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */
#include <common.h>
#include <asm/arch/hardware.h>
#include <lcd.h>
#include "am335x-fb.h"

#if !defined(LCD_CNTL_BASE)
#error "hw-base address of LCD-Controller (LCD_CNTL_BASE) not defined!"
#endif


/* LCD Control Register */
#define LCD_CLK_DIVISOR(x)			((x) << 8)
#define LCD_RASTER_MODE				0x01
/* LCD Clock Enable Register */
#define LCD_CORECLKEN				(0x01 << 0)
#define LCD_LIDDCLKEN				(0x01 << 1)
#define LCD_DMACLKEN				(0x01 << 2)
/* LCD DMA Control Register */
#define LCD_DMA_BURST_SIZE(x)			((x) << 4)
#define LCD_DMA_BURST_1				0x0
#define LCD_DMA_BURST_2				0x1
#define LCD_DMA_BURST_4				0x2
#define LCD_DMA_BURST_8				0x3
#define LCD_DMA_BURST_16			0x4
/* LCD Timing_0 Register */
#define LCD_HBPLSB(x)				((((x)-1) & 0xFF) << 24)
#define LCD_HFPLSB(x)				((((x)-1) & 0xFF) << 16)
#define LCD_HSWLSB(x)				((((x)-1) & 0x3F) << 10)
#define LCD_HORLSB(x)				(((((x) >> 4)-1) & 0x3F) << 4)
#define LCD_HORMSB(x)				(((((x) >> 4)-1) & 0x40) >> 4)
/* LCD Timing_1 Register */
#define LCD_VBP(x)				((x) << 24)
#define LCD_VFP(x)				((x) << 16)
#define LCD_VSW(x)				(((x)-1) << 10)
#define LCD_VERLSB(x)				(((x)-1) & 0x3FF)
/* LCD Timing_2 Register */
#define LCD_HSWMSB(x)				((((x)-1) & 0x3C0) << 21)
#define LCD_VERMSB(x)				((((x)-1) & 0x400) << 16)
#define LCD_HBPMSB(x)				((((x)-1) & 0x300) >> 4)
#define LCD_HFPMSB(x)				((((x)-1) & 0x300) >> 8)
#define LCD_INVMASK(x)				((x) & 0x3F00000)
/* LCD Raster Ctrl Register */
#define LCD_TFT_24BPP_MODE			(1 << 25)
#define LCD_TFT_24BPP_UNPACK			(1 << 26)
#define LCD_PALMODE_RAWDATA			(0x10 << 20)
#define LCD_TFT_MODE				(0x01 << 7)
#define LCD_RASTER_ENABLE			(0x01 << 0)


/* Macro definitions */
#define FBSIZE(x)	((x->hactive * x->vactive * x->bpp) >> 3)

struct am335x_lcdhw {
	unsigned int		pid;			/* 0x00 */
	unsigned int		ctrl;			/* 0x04 */
	unsigned int		gap0;			/* 0x08 */
	unsigned int		lidd_ctrl;		/* 0x0C */
	unsigned int		lidd_cs0_conf;		/* 0x10 */
	unsigned int		lidd_cs0_addr;		/* 0x14 */
	unsigned int		lidd_cs0_data;		/* 0x18 */
	unsigned int		lidd_cs1_conf;		/* 0x1C */
	unsigned int		lidd_cs1_addr;		/* 0x20 */
	unsigned int		lidd_cs1_data;		/* 0x24 */
	unsigned int		raster_ctrl;		/* 0x28 */
	unsigned int		raster_timing0;		/* 0x2C */
	unsigned int		raster_timing1;		/* 0x30 */
	unsigned int		raster_timing2;		/* 0x34 */
	unsigned int		raster_subpanel;	/* 0x38 */
	unsigned int		raster_subpanel2;	/* 0x3C */
	unsigned int		lcddma_ctrl;		/* 0x40 */
	unsigned int		lcddma_fb0_base;	/* 0x44 */
	unsigned int		lcddma_fb0_ceiling;	/* 0x48 */
	unsigned int		lcddma_fb1_base;	/* 0x4C */
	unsigned int		lcddma_fb1_ceiling;	/* 0x50 */
	unsigned int		sysconfig;		/* 0x54 */
	unsigned int		irqstatus_raw;		/* 0x58 */
	unsigned int		irqstatus;		/* 0x5C */
	unsigned int		irqenable_set;		/* 0x60 */
	unsigned int		irqenable_clear;	/* 0x64 */
	unsigned int		gap1;			/* 0x68 */
	unsigned int		clkc_enable;		/* 0x6C */
	unsigned int		clkc_reset;		/* 0x70 */
};

static struct am335x_lcdhw *lcdhw = (void *)LCD_CNTL_BASE;
DECLARE_GLOBAL_DATA_PTR;

int lcd_get_size(int *line_length)
{
	*line_length = (panel_info.vl_col * NBITS(panel_info.vl_bpix)) / 8;
	return *line_length * panel_info.vl_row + 0x20;
}

int am335xfb_init(struct am335x_lcdpanel *panel)
{
	if (0 == gd->fb_base) {
		printf("ERROR: no valid fb_base stored in GLOBAL_DATA_PTR!\n");
		return -1;
	}
	if (0 == panel) {
		printf("ERROR: missing ptr to am335x_lcdpanel!\n");
		return -1;
	}

	debug("setting up LCD-Controller for %dx%dx%d (hfp=%d,hbp=%d,hsw=%d / ",
	      panel->hactive, panel->vactive, panel->bpp,
	      panel->hfp, panel->hbp, panel->hsw);
	debug("vfp=%d,vbp=%d,vsw=%d / clk-div=%d)\n",
	      panel->vfp, panel->vfp, panel->vsw, panel->pxl_clk_div);
	debug("using frambuffer at 0x%08x with size %d.\n",
	      (unsigned int)gd->fb_base, FBSIZE(panel));

	/* palette default entry */
	memset((void *)gd->fb_base, 0, 0x20);
	*(unsigned int *)gd->fb_base = 0x4000;

	/* turn ON display through powercontrol function if accessible */
	if (0 != panel->panel_power_ctrl)
		panel->panel_power_ctrl(1);

	debug("am335x-fb: wait for stable power ...\n");
	mdelay(panel->pup_delay);
	lcdhw->clkc_enable = LCD_CORECLKEN | LCD_LIDDCLKEN | LCD_DMACLKEN;
	lcdhw->raster_ctrl = 0;
	lcdhw->ctrl = LCD_CLK_DIVISOR(panel->pxl_clk_div) | LCD_RASTER_MODE;
	lcdhw->lcddma_fb0_base = gd->fb_base;
	lcdhw->lcddma_fb0_ceiling = gd->fb_base + FBSIZE(panel) + 0x20;
	lcdhw->lcddma_fb1_base = gd->fb_base;
	lcdhw->lcddma_fb1_ceiling = gd->fb_base + FBSIZE(panel) + 0x20;
	lcdhw->lcddma_ctrl = LCD_DMA_BURST_SIZE(LCD_DMA_BURST_16);

	lcdhw->raster_timing0 = LCD_HORLSB(panel->hactive) |
				LCD_HORMSB(panel->hactive) |
				LCD_HFPLSB(panel->hfp) |
				LCD_HBPLSB(panel->hbp) |
				LCD_HSWLSB(panel->hsw);
	lcdhw->raster_timing1 = LCD_VBP(panel->vbp) |
				LCD_VFP(panel->vfp) |
				LCD_VSW(panel->vsw) |
				LCD_VERLSB(panel->vactive);
	lcdhw->raster_timing2 = LCD_HSWMSB(panel->hsw) |
				LCD_VERMSB(panel->vactive) |
				LCD_INVMASK(panel->pol) |
				LCD_HBPMSB(panel->hbp) |
				LCD_HFPMSB(panel->hfp) |
				0x0000FF00;	/* clk cycles for ac-bias */
	lcdhw->raster_ctrl =	LCD_TFT_24BPP_MODE |
				LCD_TFT_24BPP_UNPACK |
				LCD_PALMODE_RAWDATA |
				LCD_TFT_MODE |
				LCD_RASTER_ENABLE;

	gd->fb_base += 0x20;	/* point fb behind palette */

	debug("am335x-fb: waiting picture to be stable.\n.");
	mdelay(panel->pon_delay);

	return 0;
}