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@@ -0,0 +1,406 @@
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+/*
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+ * Copyright (C) STMicroelectronics SA 2017
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+ *
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+ * Authors: Philippe Cornu <philippe.cornu@st.com>
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+ * Yannick Fertre <yannick.fertre@st.com>
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+ *
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+ * SPDX-License-Identifier: GPL-2.0+
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+ */
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+
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+#include <common.h>
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+#include <clk.h>
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+#include <dm.h>
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+#include <panel.h>
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+#include <video.h>
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+#include <asm/io.h>
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+#include <asm/arch/gpio.h>
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+#include <dm/device-internal.h>
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+
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+DECLARE_GLOBAL_DATA_PTR;
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+
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+struct stm32_ltdc_priv {
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+ void __iomem *regs;
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+ struct display_timing timing;
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+ enum video_log2_bpp l2bpp;
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+ u32 bg_col_argb;
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+ u32 crop_x, crop_y, crop_w, crop_h;
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+ u32 alpha;
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+};
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+
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+/* LTDC main registers */
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+#define LTDC_IDR 0x00 /* IDentification */
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+#define LTDC_LCR 0x04 /* Layer Count */
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+#define LTDC_SSCR 0x08 /* Synchronization Size Configuration */
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+#define LTDC_BPCR 0x0C /* Back Porch Configuration */
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+#define LTDC_AWCR 0x10 /* Active Width Configuration */
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+#define LTDC_TWCR 0x14 /* Total Width Configuration */
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+#define LTDC_GCR 0x18 /* Global Control */
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+#define LTDC_GC1R 0x1C /* Global Configuration 1 */
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+#define LTDC_GC2R 0x20 /* Global Configuration 2 */
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+#define LTDC_SRCR 0x24 /* Shadow Reload Configuration */
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+#define LTDC_GACR 0x28 /* GAmma Correction */
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+#define LTDC_BCCR 0x2C /* Background Color Configuration */
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+#define LTDC_IER 0x34 /* Interrupt Enable */
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+#define LTDC_ISR 0x38 /* Interrupt Status */
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+#define LTDC_ICR 0x3C /* Interrupt Clear */
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+#define LTDC_LIPCR 0x40 /* Line Interrupt Position Conf. */
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+#define LTDC_CPSR 0x44 /* Current Position Status */
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+#define LTDC_CDSR 0x48 /* Current Display Status */
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+
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+/* LTDC layer 1 registers */
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+#define LTDC_L1LC1R 0x80 /* L1 Layer Configuration 1 */
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+#define LTDC_L1LC2R 0x84 /* L1 Layer Configuration 2 */
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+#define LTDC_L1CR 0x84 /* L1 Control */
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+#define LTDC_L1WHPCR 0x88 /* L1 Window Hor Position Config */
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+#define LTDC_L1WVPCR 0x8C /* L1 Window Vert Position Config */
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+#define LTDC_L1CKCR 0x90 /* L1 Color Keying Configuration */
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+#define LTDC_L1PFCR 0x94 /* L1 Pixel Format Configuration */
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+#define LTDC_L1CACR 0x98 /* L1 Constant Alpha Config */
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+#define LTDC_L1DCCR 0x9C /* L1 Default Color Configuration */
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+#define LTDC_L1BFCR 0xA0 /* L1 Blend Factors Configuration */
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+#define LTDC_L1FBBCR 0xA4 /* L1 FrameBuffer Bus Control */
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+#define LTDC_L1AFBCR 0xA8 /* L1 AuxFB Control */
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+#define LTDC_L1CFBAR 0xAC /* L1 Color FrameBuffer Address */
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+#define LTDC_L1CFBLR 0xB0 /* L1 Color FrameBuffer Length */
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+#define LTDC_L1CFBLNR 0xB4 /* L1 Color FrameBuffer Line Nb */
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+#define LTDC_L1AFBAR 0xB8 /* L1 AuxFB Address */
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+#define LTDC_L1AFBLR 0xBC /* L1 AuxFB Length */
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+#define LTDC_L1AFBLNR 0xC0 /* L1 AuxFB Line Number */
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+#define LTDC_L1CLUTWR 0xC4 /* L1 CLUT Write */
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+
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+/* Bit definitions */
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+#define SSCR_VSH GENMASK(10, 0) /* Vertical Synchronization Height */
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+#define SSCR_HSW GENMASK(27, 16) /* Horizontal Synchronization Width */
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+
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+#define BPCR_AVBP GENMASK(10, 0) /* Accumulated Vertical Back Porch */
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+#define BPCR_AHBP GENMASK(27, 16) /* Accumulated Horizontal Back Porch */
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+
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+#define AWCR_AAH GENMASK(10, 0) /* Accumulated Active Height */
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+#define AWCR_AAW GENMASK(27, 16) /* Accumulated Active Width */
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+
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+#define TWCR_TOTALH GENMASK(10, 0) /* TOTAL Height */
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+#define TWCR_TOTALW GENMASK(27, 16) /* TOTAL Width */
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+
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+#define GCR_LTDCEN BIT(0) /* LTDC ENable */
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+#define GCR_DEN BIT(16) /* Dither ENable */
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+#define GCR_PCPOL BIT(28) /* Pixel Clock POLarity-Inverted */
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+#define GCR_DEPOL BIT(29) /* Data Enable POLarity-High */
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+#define GCR_VSPOL BIT(30) /* Vertical Synchro POLarity-High */
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+#define GCR_HSPOL BIT(31) /* Horizontal Synchro POLarity-High */
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+
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+#define GC1R_WBCH GENMASK(3, 0) /* Width of Blue CHannel output */
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+#define GC1R_WGCH GENMASK(7, 4) /* Width of Green Channel output */
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+#define GC1R_WRCH GENMASK(11, 8) /* Width of Red Channel output */
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+#define GC1R_PBEN BIT(12) /* Precise Blending ENable */
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+#define GC1R_DT GENMASK(15, 14) /* Dithering Technique */
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+#define GC1R_GCT GENMASK(19, 17) /* Gamma Correction Technique */
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+#define GC1R_SHREN BIT(21) /* SHadow Registers ENabled */
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+#define GC1R_BCP BIT(22) /* Background Colour Programmable */
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+#define GC1R_BBEN BIT(23) /* Background Blending ENabled */
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+#define GC1R_LNIP BIT(24) /* Line Number IRQ Position */
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+#define GC1R_TP BIT(25) /* Timing Programmable */
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+#define GC1R_IPP BIT(26) /* IRQ Polarity Programmable */
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+#define GC1R_SPP BIT(27) /* Sync Polarity Programmable */
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+#define GC1R_DWP BIT(28) /* Dither Width Programmable */
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+#define GC1R_STREN BIT(29) /* STatus Registers ENabled */
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+#define GC1R_BMEN BIT(31) /* Blind Mode ENabled */
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+
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+#define GC2R_EDCA BIT(0) /* External Display Control Ability */
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+#define GC2R_STSAEN BIT(1) /* Slave Timing Sync Ability ENabled */
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+#define GC2R_DVAEN BIT(2) /* Dual-View Ability ENabled */
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+#define GC2R_DPAEN BIT(3) /* Dual-Port Ability ENabled */
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+#define GC2R_BW GENMASK(6, 4) /* Bus Width (log2 of nb of bytes) */
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+#define GC2R_EDCEN BIT(7) /* External Display Control ENabled */
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+
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+#define SRCR_IMR BIT(0) /* IMmediate Reload */
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+#define SRCR_VBR BIT(1) /* Vertical Blanking Reload */
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+
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+#define LXCR_LEN BIT(0) /* Layer ENable */
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+#define LXCR_COLKEN BIT(1) /* Color Keying Enable */
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+#define LXCR_CLUTEN BIT(4) /* Color Look-Up Table ENable */
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+
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+#define LXWHPCR_WHSTPOS GENMASK(11, 0) /* Window Horizontal StarT POSition */
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+#define LXWHPCR_WHSPPOS GENMASK(27, 16) /* Window Horizontal StoP POSition */
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+
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+#define LXWVPCR_WVSTPOS GENMASK(10, 0) /* Window Vertical StarT POSition */
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+#define LXWVPCR_WVSPPOS GENMASK(26, 16) /* Window Vertical StoP POSition */
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+
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+#define LXPFCR_PF GENMASK(2, 0) /* Pixel Format */
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+
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+#define LXCACR_CONSTA GENMASK(7, 0) /* CONSTant Alpha */
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+
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+#define LXBFCR_BF2 GENMASK(2, 0) /* Blending Factor 2 */
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+#define LXBFCR_BF1 GENMASK(10, 8) /* Blending Factor 1 */
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+
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+#define LXCFBLR_CFBLL GENMASK(12, 0) /* Color Frame Buffer Line Length */
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+#define LXCFBLR_CFBP GENMASK(28, 16) /* Color Frame Buffer Pitch in bytes */
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+
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+#define LXCFBLNR_CFBLN GENMASK(10, 0) /* Color Frame Buffer Line Number */
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+
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+#define BF1_PAXCA 0x600 /* Pixel Alpha x Constant Alpha */
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+#define BF2_1PAXCA 0x007 /* 1 - (Pixel Alpha x Constant Alpha) */
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+
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+enum stm32_ltdc_pix_fmt {
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+ PF_ARGB8888 = 0,
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+ PF_RGB888,
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+ PF_RGB565,
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+ PF_ARGB1555,
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+ PF_ARGB4444,
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+ PF_L8,
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+ PF_AL44,
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+ PF_AL88
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+};
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+
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+/* TODO add more color format support */
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+static u32 stm32_ltdc_get_pixel_format(enum video_log2_bpp l2bpp)
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+{
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+ enum stm32_ltdc_pix_fmt pf;
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+
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+ switch (l2bpp) {
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+ case VIDEO_BPP16:
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+ pf = PF_RGB565;
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+ break;
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+
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+ case VIDEO_BPP1:
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+ case VIDEO_BPP2:
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+ case VIDEO_BPP4:
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+ case VIDEO_BPP8:
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+ case VIDEO_BPP32:
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+ default:
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+ debug("%s: warning %dbpp not supported yet, %dbpp instead\n",
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+ __func__, VNBITS(l2bpp), VNBITS(VIDEO_BPP16));
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+ pf = PF_RGB565;
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+ break;
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+ }
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+
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+ debug("%s: %d bpp -> ltdc pf %d\n", __func__, VNBITS(l2bpp), pf);
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+
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+ return (u32)pf;
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+}
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+
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+static void stm32_ltdc_enable(struct stm32_ltdc_priv *priv)
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+{
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+ /* Reload configuration immediately & enable LTDC */
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+ setbits_le32(priv->regs + LTDC_SRCR, SRCR_IMR);
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+ setbits_le32(priv->regs + LTDC_GCR, GCR_LTDCEN);
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+}
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+
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+static void stm32_ltdc_set_mode(struct stm32_ltdc_priv *priv)
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+{
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+ void __iomem *regs = priv->regs;
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+ struct display_timing *timing = &priv->timing;
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+ u32 hsync, vsync, acc_hbp, acc_vbp, acc_act_w, acc_act_h;
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+ u32 total_w, total_h;
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+ u32 val;
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+
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+ /* Convert video timings to ltdc timings */
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+ hsync = timing->hsync_len.typ - 1;
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+ vsync = timing->vsync_len.typ - 1;
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+ acc_hbp = hsync + timing->hback_porch.typ;
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+ acc_vbp = vsync + timing->vback_porch.typ;
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+ acc_act_w = acc_hbp + timing->hactive.typ;
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+ acc_act_h = acc_vbp + timing->vactive.typ;
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+ total_w = acc_act_w + timing->hfront_porch.typ;
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+ total_h = acc_act_h + timing->vfront_porch.typ;
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+
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+ /* Synchronization sizes */
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+ val = (hsync << 16) | vsync;
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+ clrsetbits_le32(regs + LTDC_SSCR, SSCR_VSH | SSCR_HSW, val);
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+
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+ /* Accumulated back porch */
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+ val = (acc_hbp << 16) | acc_vbp;
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+ clrsetbits_le32(regs + LTDC_BPCR, BPCR_AVBP | BPCR_AHBP, val);
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+
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+ /* Accumulated active width */
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+ val = (acc_act_w << 16) | acc_act_h;
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+ clrsetbits_le32(regs + LTDC_AWCR, AWCR_AAW | AWCR_AAH, val);
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+
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+ /* Total width & height */
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+ val = (total_w << 16) | total_h;
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+ clrsetbits_le32(regs + LTDC_TWCR, TWCR_TOTALH | TWCR_TOTALW, val);
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+
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+ /* Signal polarities */
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+ val = 0;
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+ debug("%s: timing->flags 0x%08x\n", __func__, timing->flags);
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+ if (timing->flags & DISPLAY_FLAGS_HSYNC_HIGH)
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+ val |= GCR_HSPOL;
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+ if (timing->flags & DISPLAY_FLAGS_VSYNC_HIGH)
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+ val |= GCR_VSPOL;
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+ if (timing->flags & DISPLAY_FLAGS_DE_HIGH)
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+ val |= GCR_DEPOL;
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+ if (timing->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
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+ val |= GCR_PCPOL;
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+ clrsetbits_le32(regs + LTDC_GCR,
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+ GCR_HSPOL | GCR_VSPOL | GCR_DEPOL | GCR_PCPOL, val);
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+
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+ /* Overall background color */
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+ writel(priv->bg_col_argb, priv->regs + LTDC_BCCR);
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+}
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+
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+static void stm32_ltdc_set_layer1(struct stm32_ltdc_priv *priv, ulong fb_addr)
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+{
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+ void __iomem *regs = priv->regs;
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+ u32 x0, x1, y0, y1;
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+ u32 pitch_in_bytes;
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+ u32 line_length;
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+ u32 bus_width;
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+ u32 val, tmp, bpp;
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+
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+ x0 = priv->crop_x;
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+ x1 = priv->crop_x + priv->crop_w - 1;
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+ y0 = priv->crop_y;
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+ y1 = priv->crop_y + priv->crop_h - 1;
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+
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+ /* Horizontal start and stop position */
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+ tmp = (readl(regs + LTDC_BPCR) & BPCR_AHBP) >> 16;
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+ val = ((x1 + 1 + tmp) << 16) + (x0 + 1 + tmp);
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+ clrsetbits_le32(regs + LTDC_L1WHPCR, LXWHPCR_WHSTPOS | LXWHPCR_WHSPPOS,
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+ val);
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+
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+ /* Vertical start & stop position */
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+ tmp = readl(regs + LTDC_BPCR) & BPCR_AVBP;
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+ val = ((y1 + 1 + tmp) << 16) + (y0 + 1 + tmp);
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+ clrsetbits_le32(regs + LTDC_L1WVPCR, LXWVPCR_WVSTPOS | LXWVPCR_WVSPPOS,
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+ val);
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+
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+ /* Layer background color */
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+ writel(priv->bg_col_argb, regs + LTDC_L1DCCR);
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+
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+ /* Color frame buffer pitch in bytes & line length */
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+ bpp = VNBITS(priv->l2bpp);
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+ pitch_in_bytes = priv->crop_w * (bpp >> 3);
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+ bus_width = 8 << ((readl(regs + LTDC_GC2R) & GC2R_BW) >> 4);
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+ line_length = ((bpp >> 3) * priv->crop_w) + (bus_width >> 3) - 1;
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+ val = (pitch_in_bytes << 16) | line_length;
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+ clrsetbits_le32(regs + LTDC_L1CFBLR, LXCFBLR_CFBLL | LXCFBLR_CFBP, val);
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+
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+ /* Pixel format */
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+ val = stm32_ltdc_get_pixel_format(priv->l2bpp);
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+ clrsetbits_le32(regs + LTDC_L1PFCR, LXPFCR_PF, val);
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+
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+ /* Constant alpha value */
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+ clrsetbits_le32(regs + LTDC_L1CACR, LXCACR_CONSTA, priv->alpha);
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+
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+ /* Blending factors */
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+ clrsetbits_le32(regs + LTDC_L1BFCR, LXBFCR_BF2 | LXBFCR_BF1,
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+ BF1_PAXCA | BF2_1PAXCA);
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+
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+ /* Frame buffer line number */
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+ clrsetbits_le32(regs + LTDC_L1CFBLNR, LXCFBLNR_CFBLN, priv->crop_h);
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+
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+ /* Frame buffer address */
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+ writel(fb_addr, regs + LTDC_L1CFBAR);
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+
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+ /* Enable layer 1 */
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+ setbits_le32(priv->regs + LTDC_L1CR, LXCR_LEN);
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+}
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+
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+static int stm32_ltdc_probe(struct udevice *dev)
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+{
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+ struct video_uc_platdata *uc_plat = dev_get_uclass_platdata(dev);
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+ struct video_priv *uc_priv = dev_get_uclass_priv(dev);
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+ struct stm32_ltdc_priv *priv = dev_get_priv(dev);
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+ struct udevice *panel;
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+ struct clk pclk, pxclk;
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+ int ret;
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+
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+ priv->regs = (void *)dev_read_addr(dev);
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+ if ((fdt_addr_t)priv->regs == FDT_ADDR_T_NONE) {
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+ debug("%s: ltdc dt register address error\n", __func__);
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+ return -EINVAL;
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+ }
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+
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+ ret = uclass_first_device(UCLASS_PANEL, &panel);
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+ if (ret) {
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+ debug("%s: panel device error %d\n", __func__, ret);
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+ return ret;
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+ }
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+
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+ ret = panel_enable_backlight(panel);
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+ if (ret) {
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+ debug("%s: panel %s enable backlight error %d\n",
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+ __func__, panel->name, ret);
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+ return ret;
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+ }
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+
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+ ret = fdtdec_decode_display_timing(gd->fdt_blob, dev_of_offset(dev),
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+ 0, &priv->timing);
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+ if (ret) {
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+ debug("%s: decode display timing error %d\n", __func__, ret);
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+ return -EINVAL;
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+ }
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+
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+ ret = clk_get_by_name(dev, "pclk", &pclk);
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+ if (ret) {
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+ debug("%s: peripheral clock get error %d\n", __func__, ret);
|
|
|
+ return ret;
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = clk_enable(&pclk);
|
|
|
+ if (ret) {
|
|
|
+ debug("%s: peripheral clock enable error %d\n", __func__, ret);
|
|
|
+ return ret;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Verify pixel clock value if any & inform user accordingly */
|
|
|
+ ret = clk_get_by_name(dev, "pxclk", &pxclk);
|
|
|
+ if (!ret) {
|
|
|
+ if (clk_get_rate(&pxclk) != priv->timing.pixelclock.typ)
|
|
|
+ printf("Warning: please adjust ltdc pixel clock\n");
|
|
|
+ }
|
|
|
+
|
|
|
+ /* TODO Below parameters are hard-coded for the moment... */
|
|
|
+ priv->l2bpp = VIDEO_BPP16;
|
|
|
+ priv->bg_col_argb = 0xFFFFFFFF; /* white no transparency */
|
|
|
+ priv->crop_x = 0;
|
|
|
+ priv->crop_y = 0;
|
|
|
+ priv->crop_w = priv->timing.hactive.typ;
|
|
|
+ priv->crop_h = priv->timing.vactive.typ;
|
|
|
+ priv->alpha = 0xFF;
|
|
|
+
|
|
|
+ debug("%s: %dx%d %dbpp frame buffer at 0x%lx\n", __func__,
|
|
|
+ priv->timing.hactive.typ, priv->timing.vactive.typ,
|
|
|
+ VNBITS(priv->l2bpp), uc_plat->base);
|
|
|
+ debug("%s: crop %d,%d %dx%d bg 0x%08x alpha %d\n", __func__,
|
|
|
+ priv->crop_x, priv->crop_y, priv->crop_w, priv->crop_h,
|
|
|
+ priv->bg_col_argb, priv->alpha);
|
|
|
+
|
|
|
+ /* Configure & start LTDC */
|
|
|
+ stm32_ltdc_set_mode(priv);
|
|
|
+ stm32_ltdc_set_layer1(priv, uc_plat->base);
|
|
|
+ stm32_ltdc_enable(priv);
|
|
|
+
|
|
|
+ uc_priv->xsize = priv->timing.hactive.typ;
|
|
|
+ uc_priv->ysize = priv->timing.vactive.typ;
|
|
|
+ uc_priv->bpix = priv->l2bpp;
|
|
|
+
|
|
|
+ video_set_flush_dcache(dev, true);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int stm32_ltdc_bind(struct udevice *dev)
|
|
|
+{
|
|
|
+ struct video_uc_platdata *uc_plat = dev_get_uclass_platdata(dev);
|
|
|
+
|
|
|
+ uc_plat->size = CONFIG_VIDEO_STM32_MAX_XRES *
|
|
|
+ CONFIG_VIDEO_STM32_MAX_YRES *
|
|
|
+ (CONFIG_VIDEO_STM32_MAX_BPP >> 3);
|
|
|
+ debug("%s: frame buffer max size %d bytes\n", __func__, uc_plat->size);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static const struct udevice_id stm32_ltdc_ids[] = {
|
|
|
+ { .compatible = "st,stm32-ltdc" },
|
|
|
+ { }
|
|
|
+};
|
|
|
+
|
|
|
+U_BOOT_DRIVER(stm32_ltdc) = {
|
|
|
+ .name = "stm32_ltdc",
|
|
|
+ .id = UCLASS_VIDEO,
|
|
|
+ .of_match = stm32_ltdc_ids,
|
|
|
+ .probe = stm32_ltdc_probe,
|
|
|
+ .bind = stm32_ltdc_bind,
|
|
|
+ .priv_auto_alloc_size = sizeof(struct stm32_ltdc_priv),
|
|
|
+};
|
Tom Rini