2 * Driver for AT91/AT32 LCD Controller
4 * Copyright (C) 2007 Atmel Corporation
6 * SPDX-License-Identifier: GPL-2.0+
11 #include <asm/arch/gpio.h>
12 #include <asm/arch/clk.h>
14 #include <atmel_lcdc.h>
16 /* 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
23 #if defined(CONFIG_AT91SAM9263) || defined(CONFIG_AT91CAP9)
24 #define ATMEL_LCDC_FIFO_SIZE 2048
26 #define ATMEL_LCDC_FIFO_SIZE 512
29 #define lcdc_readl(mmio, reg) __raw_readl((mmio)+(reg))
30 #define lcdc_writel(mmio, reg, val) __raw_writel((val), (mmio)+(reg))
32 void lcd_setcolreg(ushort regno
, ushort red
, ushort green
, ushort blue
)
34 #if defined(CONFIG_ATMEL_LCD_BGR555)
35 lcdc_writel(panel_info
.mmio
, ATMEL_LCDC_LUT(regno
),
36 (red
>> 3) | ((green
& 0xf8) << 2) | ((blue
& 0xf8) << 7));
38 lcdc_writel(panel_info
.mmio
, ATMEL_LCDC_LUT(regno
),
39 (blue
>> 3) | ((green
& 0xfc) << 3) | ((red
& 0xf8) << 8));
43 void lcd_ctrl_init(void *lcdbase
)
47 /* Turn off the LCD controller and the DMA controller */
48 lcdc_writel(panel_info
.mmio
, ATMEL_LCDC_PWRCON
,
49 ATMEL_LCDC_GUARD_TIME
<< ATMEL_LCDC_GUARDT_OFFSET
);
51 /* Wait for the LCDC core to become idle */
52 while (lcdc_readl(panel_info
.mmio
, ATMEL_LCDC_PWRCON
) & ATMEL_LCDC_BUSY
)
55 lcdc_writel(panel_info
.mmio
, ATMEL_LCDC_DMACON
, 0);
58 lcdc_writel(panel_info
.mmio
, ATMEL_LCDC_DMACON
, ATMEL_LCDC_DMARST
);
60 /* ...set frame size and burst length = 8 words (?) */
61 value
= (panel_info
.vl_col
* panel_info
.vl_row
*
62 NBITS(panel_info
.vl_bpix
)) / 32;
63 value
|= ((ATMEL_LCDC_DMA_BURST_LEN
- 1) << ATMEL_LCDC_BLENGTH_OFFSET
);
64 lcdc_writel(panel_info
.mmio
, ATMEL_LCDC_DMAFRMCFG
, value
);
67 value
= get_lcdc_clk_rate(0) / panel_info
.vl_clk
;
68 if (get_lcdc_clk_rate(0) % panel_info
.vl_clk
)
70 value
= (value
/ 2) - 1;
73 lcdc_writel(panel_info
.mmio
, ATMEL_LCDC_LCDCON1
, ATMEL_LCDC_BYPASS
);
75 lcdc_writel(panel_info
.mmio
, ATMEL_LCDC_LCDCON1
,
76 value
<< ATMEL_LCDC_CLKVAL_OFFSET
);
78 /* Initialize control register 2 */
80 value
= ATMEL_LCDC_MEMOR_BIG
| ATMEL_LCDC_CLKMOD_ALWAYSACTIVE
;
82 value
= ATMEL_LCDC_MEMOR_LITTLE
| ATMEL_LCDC_CLKMOD_ALWAYSACTIVE
;
84 if (panel_info
.vl_tft
)
85 value
|= ATMEL_LCDC_DISTYPE_TFT
;
87 value
|= panel_info
.vl_sync
;
88 value
|= (panel_info
.vl_bpix
<< 5);
89 lcdc_writel(panel_info
.mmio
, ATMEL_LCDC_LCDCON2
, value
);
92 value
= (panel_info
.vl_vsync_len
- 1) << ATMEL_LCDC_VPW_OFFSET
;
93 value
|= panel_info
.vl_upper_margin
<< ATMEL_LCDC_VBP_OFFSET
;
94 value
|= panel_info
.vl_lower_margin
;
95 lcdc_writel(panel_info
.mmio
, ATMEL_LCDC_TIM1
, value
);
97 /* Horizontal timing */
98 value
= (panel_info
.vl_right_margin
- 1) << ATMEL_LCDC_HFP_OFFSET
;
99 value
|= (panel_info
.vl_hsync_len
- 1) << ATMEL_LCDC_HPW_OFFSET
;
100 value
|= (panel_info
.vl_left_margin
- 1);
101 lcdc_writel(panel_info
.mmio
, ATMEL_LCDC_TIM2
, value
);
104 value
= (panel_info
.vl_col
- 1) << ATMEL_LCDC_HOZVAL_OFFSET
;
105 value
|= panel_info
.vl_row
- 1;
106 lcdc_writel(panel_info
.mmio
, ATMEL_LCDC_LCDFRMCFG
, value
);
108 /* FIFO Threshold: Use formula from data sheet */
109 value
= ATMEL_LCDC_FIFO_SIZE
- (2 * ATMEL_LCDC_DMA_BURST_LEN
+ 3);
110 lcdc_writel(panel_info
.mmio
, ATMEL_LCDC_FIFO
, value
);
112 /* Toggle LCD_MODE every frame */
113 lcdc_writel(panel_info
.mmio
, ATMEL_LCDC_MVAL
, 0);
115 /* Disable all interrupts */
116 lcdc_writel(panel_info
.mmio
, ATMEL_LCDC_IDR
, ~0UL);
119 value
= ATMEL_LCDC_PS_DIV8
|
120 ATMEL_LCDC_ENA_PWMENABLE
;
121 if (!panel_info
.vl_cont_pol_low
)
122 value
|= ATMEL_LCDC_POL_POSITIVE
;
123 lcdc_writel(panel_info
.mmio
, ATMEL_LCDC_CONTRAST_CTR
, value
);
124 lcdc_writel(panel_info
.mmio
, ATMEL_LCDC_CONTRAST_VAL
, ATMEL_LCDC_CVAL_DEFAULT
);
126 /* Set framebuffer DMA base address and pixel offset */
127 lcdc_writel(panel_info
.mmio
, ATMEL_LCDC_DMABADDR1
, (u_long
)lcdbase
);
129 lcdc_writel(panel_info
.mmio
, ATMEL_LCDC_DMACON
, ATMEL_LCDC_DMAEN
);
130 lcdc_writel(panel_info
.mmio
, ATMEL_LCDC_PWRCON
,
131 (ATMEL_LCDC_GUARD_TIME
<< ATMEL_LCDC_GUARDT_OFFSET
) | ATMEL_LCDC_PWR
);
134 ulong
calc_fbsize(void)
136 return ((panel_info
.vl_col
* panel_info
.vl_row
*
137 NBITS(panel_info
.vl_bpix
)) / 8) + PAGE_SIZE
;