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Bo Shenf6b690e2012-05-25 00:59:58 +00001/*
2 * Driver for AT91/AT32 MULTI LAYER LCD Controller
3 *
4 * Copyright (C) 2012 Atmel Corporation
5 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02006 * SPDX-License-Identifier: GPL-2.0+
Bo Shenf6b690e2012-05-25 00:59:58 +00007 */
8
9#include <common.h>
10#include <asm/io.h>
11#include <asm/arch/gpio.h>
12#include <asm/arch/clk.h>
13#include <lcd.h>
14#include <atmel_hlcdc.h>
15
Bo Shenf6b690e2012-05-25 00:59:58 +000016/* configurable parameters */
17#define ATMEL_LCDC_CVAL_DEFAULT 0xc8
18#define ATMEL_LCDC_DMA_BURST_LEN 8
19#ifndef ATMEL_LCDC_GUARD_TIME
20#define ATMEL_LCDC_GUARD_TIME 1
21#endif
22
23#define ATMEL_LCDC_FIFO_SIZE 512
24
25#define lcdc_readl(reg) __raw_readl((reg))
26#define lcdc_writel(reg, val) __raw_writel((val), (reg))
27
Bo Shencfcd1c02012-11-08 17:49:14 +000028/*
29 * the CLUT register map as following
30 * RCLUT(24 ~ 16), GCLUT(15 ~ 8), BCLUT(7 ~ 0)
31 */
32void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue)
33{
34 lcdc_writel(((red << LCDC_BASECLUT_RCLUT_Pos) & LCDC_BASECLUT_RCLUT_Msk)
35 | ((green << LCDC_BASECLUT_GCLUT_Pos) & LCDC_BASECLUT_GCLUT_Msk)
36 | ((blue << LCDC_BASECLUT_BCLUT_Pos) & LCDC_BASECLUT_BCLUT_Msk),
37 panel_info.mmio + ATMEL_LCDC_LUT(regno));
38}
39
Bo Shenf6b690e2012-05-25 00:59:58 +000040void lcd_ctrl_init(void *lcdbase)
41{
42 unsigned long value;
43 struct lcd_dma_desc *desc;
44 struct atmel_hlcd_regs *regs;
45
46 if (!has_lcdc())
47 return; /* No lcdc */
48
49 regs = (struct atmel_hlcd_regs *)panel_info.mmio;
50
51 /* Disable DISP signal */
52 lcdc_writel(&regs->lcdc_lcddis, LCDC_LCDDIS_DISPDIS);
53 while ((lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_DISPSTS))
54 udelay(1);
55 /* Disable synchronization */
56 lcdc_writel(&regs->lcdc_lcddis, LCDC_LCDDIS_SYNCDIS);
57 while ((lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_LCDSTS))
58 udelay(1);
59 /* Disable pixel clock */
60 lcdc_writel(&regs->lcdc_lcddis, LCDC_LCDDIS_CLKDIS);
61 while ((lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_CLKSTS))
62 udelay(1);
63 /* Disable PWM */
64 lcdc_writel(&regs->lcdc_lcddis, LCDC_LCDDIS_PWMDIS);
65 while ((lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_PWMSTS))
66 udelay(1);
67
68 /* Set pixel clock */
69 value = get_lcdc_clk_rate(0) / panel_info.vl_clk;
70 if (get_lcdc_clk_rate(0) % panel_info.vl_clk)
71 value++;
72
73 if (value < 1) {
74 /* Using system clock as pixel clock */
75 lcdc_writel(&regs->lcdc_lcdcfg0,
76 LCDC_LCDCFG0_CLKDIV(0)
77 | LCDC_LCDCFG0_CGDISHCR
78 | LCDC_LCDCFG0_CGDISHEO
79 | LCDC_LCDCFG0_CGDISOVR1
80 | LCDC_LCDCFG0_CGDISBASE
81 | panel_info.vl_clk_pol
82 | LCDC_LCDCFG0_CLKSEL);
83
84 } else {
85 lcdc_writel(&regs->lcdc_lcdcfg0,
86 LCDC_LCDCFG0_CLKDIV(value - 2)
87 | LCDC_LCDCFG0_CGDISHCR
88 | LCDC_LCDCFG0_CGDISHEO
89 | LCDC_LCDCFG0_CGDISOVR1
90 | LCDC_LCDCFG0_CGDISBASE
91 | panel_info.vl_clk_pol);
92 }
93
94 /* Initialize control register 5 */
95 value = 0;
96
97 value |= panel_info.vl_sync;
98
99#ifndef LCD_OUTPUT_BPP
100 /* Output is 24bpp */
101 value |= LCDC_LCDCFG5_MODE_OUTPUT_24BPP;
102#else
103 switch (LCD_OUTPUT_BPP) {
104 case 12:
105 value |= LCDC_LCDCFG5_MODE_OUTPUT_12BPP;
106 break;
107 case 16:
108 value |= LCDC_LCDCFG5_MODE_OUTPUT_16BPP;
109 break;
110 case 18:
111 value |= LCDC_LCDCFG5_MODE_OUTPUT_18BPP;
112 break;
113 case 24:
114 value |= LCDC_LCDCFG5_MODE_OUTPUT_24BPP;
115 break;
116 default:
117 BUG();
118 break;
119 }
120#endif
121
122 value |= LCDC_LCDCFG5_GUARDTIME(ATMEL_LCDC_GUARD_TIME);
123 value |= (LCDC_LCDCFG5_DISPDLY | LCDC_LCDCFG5_VSPDLYS);
124 lcdc_writel(&regs->lcdc_lcdcfg5, value);
125
126 /* Vertical & Horizontal Timing */
127 value = LCDC_LCDCFG1_VSPW(panel_info.vl_vsync_len - 1);
128 value |= LCDC_LCDCFG1_HSPW(panel_info.vl_hsync_len - 1);
129 lcdc_writel(&regs->lcdc_lcdcfg1, value);
130
131 value = LCDC_LCDCFG2_VBPW(panel_info.vl_lower_margin);
132 value |= LCDC_LCDCFG2_VFPW(panel_info.vl_upper_margin - 1);
133 lcdc_writel(&regs->lcdc_lcdcfg2, value);
134
135 value = LCDC_LCDCFG3_HBPW(panel_info.vl_right_margin - 1);
136 value |= LCDC_LCDCFG3_HFPW(panel_info.vl_left_margin - 1);
137 lcdc_writel(&regs->lcdc_lcdcfg3, value);
138
139 /* Display size */
140 value = LCDC_LCDCFG4_RPF(panel_info.vl_row - 1);
141 value |= LCDC_LCDCFG4_PPL(panel_info.vl_col - 1);
142 lcdc_writel(&regs->lcdc_lcdcfg4, value);
143
144 lcdc_writel(&regs->lcdc_basecfg0,
145 LCDC_BASECFG0_BLEN_AHB_INCR4 | LCDC_BASECFG0_DLBO);
146
147 switch (NBITS(panel_info.vl_bpix)) {
148 case 16:
149 lcdc_writel(&regs->lcdc_basecfg1,
150 LCDC_BASECFG1_RGBMODE_16BPP_RGB_565);
151 break;
152 default:
153 BUG();
154 break;
155 }
156
157 lcdc_writel(&regs->lcdc_basecfg2, LCDC_BASECFG2_XSTRIDE(0));
158 lcdc_writel(&regs->lcdc_basecfg3, 0);
159 lcdc_writel(&regs->lcdc_basecfg4, LCDC_BASECFG4_DMA);
160
161 /* Disable all interrupts */
162 lcdc_writel(&regs->lcdc_lcdidr, ~0UL);
163 lcdc_writel(&regs->lcdc_baseidr, ~0UL);
164
165 /* Setup the DMA descriptor, this descriptor will loop to itself */
166 desc = (struct lcd_dma_desc *)(lcdbase - 16);
167
168 desc->address = (u32)lcdbase;
169 /* Disable DMA transfer interrupt & descriptor loaded interrupt. */
170 desc->control = LCDC_BASECTRL_ADDIEN | LCDC_BASECTRL_DSCRIEN
171 | LCDC_BASECTRL_DMAIEN | LCDC_BASECTRL_DFETCH;
172 desc->next = (u32)desc;
173
174 lcdc_writel(&regs->lcdc_baseaddr, desc->address);
175 lcdc_writel(&regs->lcdc_basectrl, desc->control);
176 lcdc_writel(&regs->lcdc_basenext, desc->next);
177 lcdc_writel(&regs->lcdc_basecher, LCDC_BASECHER_CHEN |
178 LCDC_BASECHER_UPDATEEN);
179
180 /* Enable LCD */
181 value = lcdc_readl(&regs->lcdc_lcden);
182 lcdc_writel(&regs->lcdc_lcden, value | LCDC_LCDEN_CLKEN);
183 while (!(lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_CLKSTS))
184 udelay(1);
185 value = lcdc_readl(&regs->lcdc_lcden);
186 lcdc_writel(&regs->lcdc_lcden, value | LCDC_LCDEN_SYNCEN);
187 while (!(lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_LCDSTS))
188 udelay(1);
189 value = lcdc_readl(&regs->lcdc_lcden);
190 lcdc_writel(&regs->lcdc_lcden, value | LCDC_LCDEN_DISPEN);
191 while (!(lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_DISPSTS))
192 udelay(1);
193 value = lcdc_readl(&regs->lcdc_lcden);
194 lcdc_writel(&regs->lcdc_lcden, value | LCDC_LCDEN_PWMEN);
195 while (!(lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_PWMSTS))
196 udelay(1);
197}