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 ushort *configuration_get_cmap(void)
34 return (ushort *)(panel_info.mmio + ATMEL_LCDC_LUT(0));
37 void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue)
39 #if defined(CONFIG_ATMEL_LCD_BGR555)
40 lcdc_writel(panel_info.mmio, ATMEL_LCDC_LUT(regno),
41 (red >> 3) | ((green & 0xf8) << 2) | ((blue & 0xf8) << 7));
43 lcdc_writel(panel_info.mmio, ATMEL_LCDC_LUT(regno),
44 (blue >> 3) | ((green & 0xfc) << 3) | ((red & 0xf8) << 8));
48 void lcd_ctrl_init(void *lcdbase)
52 /* Turn off the LCD controller and the DMA controller */
53 lcdc_writel(panel_info.mmio, ATMEL_LCDC_PWRCON,
54 ATMEL_LCDC_GUARD_TIME << ATMEL_LCDC_GUARDT_OFFSET);
56 /* Wait for the LCDC core to become idle */
57 while (lcdc_readl(panel_info.mmio, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
60 lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMACON, 0);
63 lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMACON, ATMEL_LCDC_DMARST);
65 /* ...set frame size and burst length = 8 words (?) */
66 value = (panel_info.vl_col * panel_info.vl_row *
67 NBITS(panel_info.vl_bpix)) / 32;
68 value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
69 lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMAFRMCFG, value);
72 value = get_lcdc_clk_rate(0) / panel_info.vl_clk;
73 if (get_lcdc_clk_rate(0) % panel_info.vl_clk)
75 value = (value / 2) - 1;
78 lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
80 lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDCON1,
81 value << ATMEL_LCDC_CLKVAL_OFFSET);
83 /* Initialize control register 2 */
85 value = ATMEL_LCDC_MEMOR_BIG | ATMEL_LCDC_CLKMOD_ALWAYSACTIVE;
87 value = ATMEL_LCDC_MEMOR_LITTLE | ATMEL_LCDC_CLKMOD_ALWAYSACTIVE;
89 if (panel_info.vl_tft)
90 value |= ATMEL_LCDC_DISTYPE_TFT;
92 value |= panel_info.vl_sync;
93 value |= (panel_info.vl_bpix << 5);
94 lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDCON2, value);
97 value = (panel_info.vl_vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
98 value |= panel_info.vl_upper_margin << ATMEL_LCDC_VBP_OFFSET;
99 value |= panel_info.vl_lower_margin;
100 lcdc_writel(panel_info.mmio, ATMEL_LCDC_TIM1, value);
102 /* Horizontal timing */
103 value = (panel_info.vl_right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
104 value |= (panel_info.vl_hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
105 value |= (panel_info.vl_left_margin - 1);
106 lcdc_writel(panel_info.mmio, ATMEL_LCDC_TIM2, value);
109 value = (panel_info.vl_col - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
110 value |= panel_info.vl_row - 1;
111 lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDFRMCFG, value);
113 /* FIFO Threshold: Use formula from data sheet */
114 value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
115 lcdc_writel(panel_info.mmio, ATMEL_LCDC_FIFO, value);
117 /* Toggle LCD_MODE every frame */
118 lcdc_writel(panel_info.mmio, ATMEL_LCDC_MVAL, 0);
120 /* Disable all interrupts */
121 lcdc_writel(panel_info.mmio, ATMEL_LCDC_IDR, ~0UL);
124 value = ATMEL_LCDC_PS_DIV8 |
125 ATMEL_LCDC_ENA_PWMENABLE;
126 if (!panel_info.vl_cont_pol_low)
127 value |= ATMEL_LCDC_POL_POSITIVE;
128 lcdc_writel(panel_info.mmio, ATMEL_LCDC_CONTRAST_CTR, value);
129 lcdc_writel(panel_info.mmio, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
131 /* Set framebuffer DMA base address and pixel offset */
132 lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMABADDR1, (u_long)lcdbase);
134 lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMACON, ATMEL_LCDC_DMAEN);
135 lcdc_writel(panel_info.mmio, ATMEL_LCDC_PWRCON,
136 (ATMEL_LCDC_GUARD_TIME << ATMEL_LCDC_GUARDT_OFFSET) | ATMEL_LCDC_PWR);
139 ulong calc_fbsize(void)
141 return ((panel_info.vl_col * panel_info.vl_row *
142 NBITS(panel_info.vl_bpix)) / 8) + PAGE_SIZE;