1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Copyright (C) STMicroelectronics SA 2017
4  *
5  * Authors: Philippe Cornu <philippe.cornu@st.com>
6  *          Yannick Fertre <yannick.fertre@st.com>
7  *          Fabien Dessenne <fabien.dessenne@st.com>
8  *          Mickael Reulier <mickael.reulier@st.com>
9  */
10 
11 #ifndef _LTDC_H_
12 #define _LTDC_H_
13 
14 struct ltdc_caps {
15 	u32 hw_version;		/* hardware version */
16 	u32 nb_layers;		/* number of supported layers */
17 	u32 layer_ofs;		/* layer offset for applicable regs */
18 	const u32 *layer_regs;	/* layer register offset */
19 	u32 bus_width;		/* bus width (32 or 64 bits) */
20 	const u32 *pix_fmt_hw;	/* supported hw pixel formats */
21 	const u32 *pix_fmt_drm;	/* supported drm pixel formats */
22 	int pix_fmt_nb;		/* number of pixel format */
23 	bool pix_fmt_flex;	/* pixel format flexibility supported */
24 	bool non_alpha_only_l1; /* non-native no-alpha formats on layer 1 */
25 	int pad_max_freq_hz;	/* max frequency supported by pad */
26 	int nb_irq;		/* number of hardware interrupts */
27 	bool ycbcr_input;	/* ycbcr input converter supported */
28 	bool ycbcr_output;	/* ycbcr output converter supported */
29 	bool plane_reg_shadow;	/* plane shadow registers ability */
30 	bool crc;		/* cyclic redundancy check supported */
31 	bool dynamic_zorder;	/* dynamic z-order */
32 	bool plane_rotation;	/* plane rotation */
33 	bool fifo_threshold;	/* fifo underrun threshold supported */
34 };
35 
36 #define LTDC_MAX_LAYER	4
37 
38 struct fps_info {
39 	unsigned int counter;
40 	ktime_t last_timestamp;
41 };
42 
43 struct ltdc_device {
44 	void __iomem *regs;
45 	struct regmap *regmap;
46 	struct clk *pixel_clk;	/* lcd pixel clock */
47 	struct mutex err_lock;	/* protecting error_status */
48 	struct ltdc_caps caps;
49 	u32 irq_status;
50 	u32 fifo_err;		/* fifo underrun error counter */
51 	u32 fifo_warn;		/* fifo underrun warning counter */
52 	u32 fifo_threshold;	/* fifo underrun threshold */
53 	u32 transfer_err;	/* transfer error counter */
54 	struct fps_info plane_fpsi[LTDC_MAX_LAYER];
55 	struct drm_atomic_state *suspend_state;
56 	int crc_skip_count;
57 	bool crc_active;
58 };
59 
60 int ltdc_load(struct drm_device *ddev);
61 void ltdc_unload(struct drm_device *ddev);
62 void ltdc_suspend(struct drm_device *ddev);
63 int ltdc_resume(struct drm_device *ddev);
64 
65 #endif
66