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Hannes Petermaier3c5fabd2014-03-06 14:39:06 +01001/*
2 * Copyright (C) 2013 Hannes Petermaier <oe5hpm@oevsv.at>
3 * Bernecker & Rainer Industrieelektronik GmbH - http://www.br-automation.com
4 *
5 * minimal framebuffer driver for TI's AM335x SoC to be compatible with
6 * Wolfgang Denk's LCD-Framework (CONFIG_LCD, common/lcd.c)
7 *
8 * - supporting only 24bit RGB/TFT raster Mode (not using palette)
9 * - sets up LCD controller as in 'am335x_lcdpanel' struct given
10 * - starts output DMA from gd->fb_base buffer
11 *
12 * SPDX-License-Identifier: GPL-2.0+
13 */
14#include <common.h>
15#include <asm/arch/hardware.h>
16#include <lcd.h>
17#include "am335x-fb.h"
18
19#if !defined(LCD_CNTL_BASE)
20#error "hw-base address of LCD-Controller (LCD_CNTL_BASE) not defined!"
21#endif
22
23
24/* LCD Control Register */
25#define LCD_CLK_DIVISOR(x) ((x) << 8)
26#define LCD_RASTER_MODE 0x01
27/* LCD Clock Enable Register */
28#define LCD_CORECLKEN (0x01 << 0)
29#define LCD_LIDDCLKEN (0x01 << 1)
30#define LCD_DMACLKEN (0x01 << 2)
31/* LCD DMA Control Register */
32#define LCD_DMA_BURST_SIZE(x) ((x) << 4)
33#define LCD_DMA_BURST_1 0x0
34#define LCD_DMA_BURST_2 0x1
35#define LCD_DMA_BURST_4 0x2
36#define LCD_DMA_BURST_8 0x3
37#define LCD_DMA_BURST_16 0x4
38/* LCD Timing_0 Register */
39#define LCD_HBPLSB(x) ((((x)-1) & 0xFF) << 24)
40#define LCD_HFPLSB(x) ((((x)-1) & 0xFF) << 16)
41#define LCD_HSWLSB(x) ((((x)-1) & 0x3F) << 10)
42#define LCD_HORLSB(x) (((((x) >> 4)-1) & 0x3F) << 4)
43#define LCD_HORMSB(x) (((((x) >> 4)-1) & 0x40) >> 4)
44/* LCD Timing_1 Register */
45#define LCD_VBP(x) ((x) << 24)
46#define LCD_VFP(x) ((x) << 16)
47#define LCD_VSW(x) (((x)-1) << 10)
48#define LCD_VERLSB(x) (((x)-1) & 0x3FF)
49/* LCD Timing_2 Register */
50#define LCD_HSWMSB(x) ((((x)-1) & 0x3C0) << 21)
51#define LCD_VERMSB(x) ((((x)-1) & 0x400) << 16)
52#define LCD_HBPMSB(x) ((((x)-1) & 0x300) >> 4)
53#define LCD_HFPMSB(x) ((((x)-1) & 0x300) >> 8)
54#define LCD_INVMASK(x) ((x) & 0x3F00000)
55/* LCD Raster Ctrl Register */
56#define LCD_TFT_24BPP_MODE (1 << 25)
57#define LCD_TFT_24BPP_UNPACK (1 << 26)
58#define LCD_PALMODE_RAWDATA (0x10 << 20)
59#define LCD_TFT_MODE (0x01 << 7)
60#define LCD_RASTER_ENABLE (0x01 << 0)
61
62
63/* Macro definitions */
64#define FBSIZE(x) ((x->hactive * x->vactive * x->bpp) >> 3)
65
66struct am335x_lcdhw {
67 unsigned int pid; /* 0x00 */
68 unsigned int ctrl; /* 0x04 */
69 unsigned int gap0; /* 0x08 */
70 unsigned int lidd_ctrl; /* 0x0C */
71 unsigned int lidd_cs0_conf; /* 0x10 */
72 unsigned int lidd_cs0_addr; /* 0x14 */
73 unsigned int lidd_cs0_data; /* 0x18 */
74 unsigned int lidd_cs1_conf; /* 0x1C */
75 unsigned int lidd_cs1_addr; /* 0x20 */
76 unsigned int lidd_cs1_data; /* 0x24 */
77 unsigned int raster_ctrl; /* 0x28 */
78 unsigned int raster_timing0; /* 0x2C */
79 unsigned int raster_timing1; /* 0x30 */
80 unsigned int raster_timing2; /* 0x34 */
81 unsigned int raster_subpanel; /* 0x38 */
82 unsigned int raster_subpanel2; /* 0x3C */
83 unsigned int lcddma_ctrl; /* 0x40 */
84 unsigned int lcddma_fb0_base; /* 0x44 */
85 unsigned int lcddma_fb0_ceiling; /* 0x48 */
86 unsigned int lcddma_fb1_base; /* 0x4C */
87 unsigned int lcddma_fb1_ceiling; /* 0x50 */
88 unsigned int sysconfig; /* 0x54 */
89 unsigned int irqstatus_raw; /* 0x58 */
90 unsigned int irqstatus; /* 0x5C */
91 unsigned int irqenable_set; /* 0x60 */
92 unsigned int irqenable_clear; /* 0x64 */
93 unsigned int gap1; /* 0x68 */
94 unsigned int clkc_enable; /* 0x6C */
95 unsigned int clkc_reset; /* 0x70 */
96};
97
98static struct am335x_lcdhw *lcdhw = (void *)LCD_CNTL_BASE;
99DECLARE_GLOBAL_DATA_PTR;
100
101int lcd_get_size(int *line_length)
102{
103 *line_length = (panel_info.vl_col * NBITS(panel_info.vl_bpix)) / 8;
104 return *line_length * panel_info.vl_row + 0x20;
105}
106
107int am335xfb_init(struct am335x_lcdpanel *panel)
108{
109 if (0 == gd->fb_base) {
110 printf("ERROR: no valid fb_base stored in GLOBAL_DATA_PTR!\n");
111 return -1;
112 }
113 if (0 == panel) {
114 printf("ERROR: missing ptr to am335x_lcdpanel!\n");
115 return -1;
116 }
117
118 debug("setting up LCD-Controller for %dx%dx%d (hfp=%d,hbp=%d,hsw=%d / ",
119 panel->hactive, panel->vactive, panel->bpp,
120 panel->hfp, panel->hbp, panel->hsw);
121 debug("vfp=%d,vbp=%d,vsw=%d / clk-div=%d)\n",
122 panel->vfp, panel->vfp, panel->vsw, panel->pxl_clk_div);
123 debug("using frambuffer at 0x%08x with size %d.\n",
124 (unsigned int)gd->fb_base, FBSIZE(panel));
125
126 /* palette default entry */
127 memset((void *)gd->fb_base, 0, 0x20);
128 *(unsigned int *)gd->fb_base = 0x4000;
129
Hannes Petermaier3b4e16e2015-02-03 13:22:23 +0100130 /* turn ON display through powercontrol function if accessible */
131 if (0 != panel->panel_power_ctrl)
132 panel->panel_power_ctrl(1);
133
134 debug("am335x-fb: wait for stable power ...\n");
135 mdelay(panel->pup_delay);
Hannes Petermaier3c5fabd2014-03-06 14:39:06 +0100136 lcdhw->clkc_enable = LCD_CORECLKEN | LCD_LIDDCLKEN | LCD_DMACLKEN;
137 lcdhw->raster_ctrl = 0;
138 lcdhw->ctrl = LCD_CLK_DIVISOR(panel->pxl_clk_div) | LCD_RASTER_MODE;
139 lcdhw->lcddma_fb0_base = gd->fb_base;
140 lcdhw->lcddma_fb0_ceiling = gd->fb_base + FBSIZE(panel) + 0x20;
141 lcdhw->lcddma_fb1_base = gd->fb_base;
142 lcdhw->lcddma_fb1_ceiling = gd->fb_base + FBSIZE(panel) + 0x20;
143 lcdhw->lcddma_ctrl = LCD_DMA_BURST_SIZE(LCD_DMA_BURST_16);
144
145 lcdhw->raster_timing0 = LCD_HORLSB(panel->hactive) |
146 LCD_HORMSB(panel->hactive) |
147 LCD_HFPLSB(panel->hfp) |
148 LCD_HBPLSB(panel->hbp) |
149 LCD_HSWLSB(panel->hsw);
150 lcdhw->raster_timing1 = LCD_VBP(panel->vbp) |
151 LCD_VFP(panel->vfp) |
152 LCD_VSW(panel->vsw) |
153 LCD_VERLSB(panel->vactive);
154 lcdhw->raster_timing2 = LCD_HSWMSB(panel->hsw) |
155 LCD_VERMSB(panel->vactive) |
156 LCD_INVMASK(panel->pol) |
157 LCD_HBPMSB(panel->hbp) |
158 LCD_HFPMSB(panel->hfp) |
159 0x0000FF00; /* clk cycles for ac-bias */
160 lcdhw->raster_ctrl = LCD_TFT_24BPP_MODE |
161 LCD_TFT_24BPP_UNPACK |
162 LCD_PALMODE_RAWDATA |
163 LCD_TFT_MODE |
164 LCD_RASTER_ENABLE;
165
166 gd->fb_base += 0x20; /* point fb behind palette */
167
Hannes Petermaier3b4e16e2015-02-03 13:22:23 +0100168 debug("am335x-fb: waiting picture to be stable.\n.");
169 mdelay(panel->pon_delay);
Hannes Petermaier3c5fabd2014-03-06 14:39:06 +0100170
171 return 0;
172}