xref: /rk3399_rockchip-uboot/drivers/video/atmel_hlcdfb.c (revision 46d1d5dd43e4d7c78f1fd6a5ee958d7b8a8626eb)
1 /*
2  * Driver for AT91/AT32 MULTI LAYER LCD Controller
3  *
4  * Copyright (C) 2012 Atmel Corporation
5  *
6  * See file CREDITS for list of people who contributed to this
7  * project.
8  *
9  * This program is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU General Public License as
11  * published by the Free Software Foundation; either version 2 of
12  * the License, or (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
22  * MA 02111-1307 USA
23  */
24 
25 #include <common.h>
26 #include <asm/io.h>
27 #include <asm/arch/gpio.h>
28 #include <asm/arch/clk.h>
29 #include <lcd.h>
30 #include <atmel_hlcdc.h>
31 
32 int lcd_line_length;
33 
34 void *lcd_base;				/* Start of framebuffer memory	*/
35 void *lcd_console_address;		/* Start of console buffer	*/
36 
37 short console_col;
38 short console_row;
39 
40 /* configurable parameters */
41 #define ATMEL_LCDC_CVAL_DEFAULT		0xc8
42 #define ATMEL_LCDC_DMA_BURST_LEN	8
43 #ifndef ATMEL_LCDC_GUARD_TIME
44 #define ATMEL_LCDC_GUARD_TIME		1
45 #endif
46 
47 #define ATMEL_LCDC_FIFO_SIZE		512
48 
49 #define lcdc_readl(reg)		__raw_readl((reg))
50 #define lcdc_writel(reg, val)	__raw_writel((val), (reg))
51 
52 /*
53  * the CLUT register map as following
54  * RCLUT(24 ~ 16), GCLUT(15 ~ 8), BCLUT(7 ~ 0)
55  */
56 void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue)
57 {
58 	lcdc_writel(((red << LCDC_BASECLUT_RCLUT_Pos) & LCDC_BASECLUT_RCLUT_Msk)
59 		| ((green << LCDC_BASECLUT_GCLUT_Pos) & LCDC_BASECLUT_GCLUT_Msk)
60 		| ((blue << LCDC_BASECLUT_BCLUT_Pos) & LCDC_BASECLUT_BCLUT_Msk),
61 		panel_info.mmio + ATMEL_LCDC_LUT(regno));
62 }
63 
64 void lcd_ctrl_init(void *lcdbase)
65 {
66 	unsigned long value;
67 	struct lcd_dma_desc *desc;
68 	struct atmel_hlcd_regs *regs;
69 
70 	if (!has_lcdc())
71 		return;     /* No lcdc */
72 
73 	regs = (struct atmel_hlcd_regs *)panel_info.mmio;
74 
75 	/* Disable DISP signal */
76 	lcdc_writel(&regs->lcdc_lcddis, LCDC_LCDDIS_DISPDIS);
77 	while ((lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_DISPSTS))
78 		udelay(1);
79 	/* Disable synchronization */
80 	lcdc_writel(&regs->lcdc_lcddis, LCDC_LCDDIS_SYNCDIS);
81 	while ((lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_LCDSTS))
82 		udelay(1);
83 	/* Disable pixel clock */
84 	lcdc_writel(&regs->lcdc_lcddis, LCDC_LCDDIS_CLKDIS);
85 	while ((lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_CLKSTS))
86 		udelay(1);
87 	/* Disable PWM */
88 	lcdc_writel(&regs->lcdc_lcddis, LCDC_LCDDIS_PWMDIS);
89 	while ((lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_PWMSTS))
90 		udelay(1);
91 
92 	/* Set pixel clock */
93 	value = get_lcdc_clk_rate(0) / panel_info.vl_clk;
94 	if (get_lcdc_clk_rate(0) % panel_info.vl_clk)
95 		value++;
96 
97 	if (value < 1) {
98 		/* Using system clock as pixel clock */
99 		lcdc_writel(&regs->lcdc_lcdcfg0,
100 					LCDC_LCDCFG0_CLKDIV(0)
101 					| LCDC_LCDCFG0_CGDISHCR
102 					| LCDC_LCDCFG0_CGDISHEO
103 					| LCDC_LCDCFG0_CGDISOVR1
104 					| LCDC_LCDCFG0_CGDISBASE
105 					| panel_info.vl_clk_pol
106 					| LCDC_LCDCFG0_CLKSEL);
107 
108 	} else {
109 		lcdc_writel(&regs->lcdc_lcdcfg0,
110 				LCDC_LCDCFG0_CLKDIV(value - 2)
111 				| LCDC_LCDCFG0_CGDISHCR
112 				| LCDC_LCDCFG0_CGDISHEO
113 				| LCDC_LCDCFG0_CGDISOVR1
114 				| LCDC_LCDCFG0_CGDISBASE
115 				| panel_info.vl_clk_pol);
116 	}
117 
118 	/* Initialize control register 5 */
119 	value = 0;
120 
121 	value |= panel_info.vl_sync;
122 
123 #ifndef LCD_OUTPUT_BPP
124 	/* Output is 24bpp */
125 	value |= LCDC_LCDCFG5_MODE_OUTPUT_24BPP;
126 #else
127 	switch (LCD_OUTPUT_BPP) {
128 	case 12:
129 		value |= LCDC_LCDCFG5_MODE_OUTPUT_12BPP;
130 		break;
131 	case 16:
132 		value |= LCDC_LCDCFG5_MODE_OUTPUT_16BPP;
133 		break;
134 	case 18:
135 		value |= LCDC_LCDCFG5_MODE_OUTPUT_18BPP;
136 		break;
137 	case 24:
138 		value |= LCDC_LCDCFG5_MODE_OUTPUT_24BPP;
139 		break;
140 	default:
141 		BUG();
142 		break;
143 	}
144 #endif
145 
146 	value |= LCDC_LCDCFG5_GUARDTIME(ATMEL_LCDC_GUARD_TIME);
147 	value |= (LCDC_LCDCFG5_DISPDLY | LCDC_LCDCFG5_VSPDLYS);
148 	lcdc_writel(&regs->lcdc_lcdcfg5, value);
149 
150 	/* Vertical & Horizontal Timing */
151 	value = LCDC_LCDCFG1_VSPW(panel_info.vl_vsync_len - 1);
152 	value |= LCDC_LCDCFG1_HSPW(panel_info.vl_hsync_len - 1);
153 	lcdc_writel(&regs->lcdc_lcdcfg1, value);
154 
155 	value = LCDC_LCDCFG2_VBPW(panel_info.vl_lower_margin);
156 	value |= LCDC_LCDCFG2_VFPW(panel_info.vl_upper_margin - 1);
157 	lcdc_writel(&regs->lcdc_lcdcfg2, value);
158 
159 	value = LCDC_LCDCFG3_HBPW(panel_info.vl_right_margin - 1);
160 	value |= LCDC_LCDCFG3_HFPW(panel_info.vl_left_margin - 1);
161 	lcdc_writel(&regs->lcdc_lcdcfg3, value);
162 
163 	/* Display size */
164 	value = LCDC_LCDCFG4_RPF(panel_info.vl_row - 1);
165 	value |= LCDC_LCDCFG4_PPL(panel_info.vl_col - 1);
166 	lcdc_writel(&regs->lcdc_lcdcfg4, value);
167 
168 	lcdc_writel(&regs->lcdc_basecfg0,
169 			LCDC_BASECFG0_BLEN_AHB_INCR4 | LCDC_BASECFG0_DLBO);
170 
171 	switch (NBITS(panel_info.vl_bpix)) {
172 	case 16:
173 		lcdc_writel(&regs->lcdc_basecfg1,
174 			LCDC_BASECFG1_RGBMODE_16BPP_RGB_565);
175 		break;
176 	default:
177 		BUG();
178 		break;
179 	}
180 
181 	lcdc_writel(&regs->lcdc_basecfg2, LCDC_BASECFG2_XSTRIDE(0));
182 	lcdc_writel(&regs->lcdc_basecfg3, 0);
183 	lcdc_writel(&regs->lcdc_basecfg4, LCDC_BASECFG4_DMA);
184 
185 	/* Disable all interrupts */
186 	lcdc_writel(&regs->lcdc_lcdidr, ~0UL);
187 	lcdc_writel(&regs->lcdc_baseidr, ~0UL);
188 
189 	/* Setup the DMA descriptor, this descriptor will loop to itself */
190 	desc = (struct lcd_dma_desc *)(lcdbase - 16);
191 
192 	desc->address = (u32)lcdbase;
193 	/* Disable DMA transfer interrupt & descriptor loaded interrupt. */
194 	desc->control = LCDC_BASECTRL_ADDIEN | LCDC_BASECTRL_DSCRIEN
195 			| LCDC_BASECTRL_DMAIEN | LCDC_BASECTRL_DFETCH;
196 	desc->next = (u32)desc;
197 
198 	lcdc_writel(&regs->lcdc_baseaddr, desc->address);
199 	lcdc_writel(&regs->lcdc_basectrl, desc->control);
200 	lcdc_writel(&regs->lcdc_basenext, desc->next);
201 	lcdc_writel(&regs->lcdc_basecher, LCDC_BASECHER_CHEN |
202 					  LCDC_BASECHER_UPDATEEN);
203 
204 	/* Enable LCD */
205 	value = lcdc_readl(&regs->lcdc_lcden);
206 	lcdc_writel(&regs->lcdc_lcden, value | LCDC_LCDEN_CLKEN);
207 	while (!(lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_CLKSTS))
208 		udelay(1);
209 	value = lcdc_readl(&regs->lcdc_lcden);
210 	lcdc_writel(&regs->lcdc_lcden, value | LCDC_LCDEN_SYNCEN);
211 	while (!(lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_LCDSTS))
212 		udelay(1);
213 	value = lcdc_readl(&regs->lcdc_lcden);
214 	lcdc_writel(&regs->lcdc_lcden, value | LCDC_LCDEN_DISPEN);
215 	while (!(lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_DISPSTS))
216 		udelay(1);
217 	value = lcdc_readl(&regs->lcdc_lcden);
218 	lcdc_writel(&regs->lcdc_lcden, value | LCDC_LCDEN_PWMEN);
219 	while (!(lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_PWMSTS))
220 		udelay(1);
221 }
222