LXR linux/drivers/gpu/drm/tilcdc/tilcdc

   1/*
   2 * Copyright (C) 2012 Texas Instruments
   3 * Author: Rob Clark <robdclark@gmail.com>
   4 *
   5 * This program is free software; you can redistribute it and/or modify it
   6 * under the terms of the GNU General Public License version 2 as published by
   7 * the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it will be useful, but WITHOUT
  10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12 * more details.
  13 *
  14 * You should have received a copy of the GNU General Public License along with
  15 * this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18#ifndef __TILCDC_DRV_H__
  19#define __TILCDC_DRV_H__
  20
  21#include <linux/clk.h>
  22#include <linux/cpufreq.h>
  23#include <linux/module.h>
  24#include <linux/platform_device.h>
  25#include <linux/pm.h>
  26#include <linux/pm_runtime.h>
  27#include <linux/slab.h>
  28#include <linux/of.h>
  29#include <linux/of_device.h>
  30#include <linux/list.h>
  31
  32#include <drm/drmP.h>
  33#include <drm/drm_crtc_helper.h>
  34#include <drm/drm_gem_cma_helper.h>
  35#include <drm/drm_fb_cma_helper.h>
  36
  37/* Defaulting to pixel clock defined on AM335x */
  38#define TILCDC_DEFAULT_MAX_PIXELCLOCK  126000
  39/* Defaulting to max width as defined on AM335x */
  40#define TILCDC_DEFAULT_MAX_WIDTH  2048
  41/*
  42 * This may need some tweaking, but want to allow at least 1280x1024@60
  43 * with optimized DDR & EMIF settings tweaked 1920x1080@24 appears to
  44 * be supportable
  45 */
  46#define TILCDC_DEFAULT_MAX_BANDWIDTH  (1280*1024*60)
  47
  48
  49struct tilcdc_drm_private {
  50        void __iomem *mmio;
  51
  52        struct clk *disp_clk;    /* display dpll */
  53        struct clk *clk;         /* functional clock */
  54        int rev;                 /* IP revision */
  55
  56        /* don't attempt resolutions w/ higher W * H * Hz: */
  57        uint32_t max_bandwidth;
  58        /*
  59         * Pixel Clock will be restricted to some value as
  60         * defined in the device datasheet measured in KHz
  61         */
  62        uint32_t max_pixelclock;
  63        /*
  64         * Max allowable width is limited on a per device basis
  65         * measured in pixels
  66         */
  67        uint32_t max_width;
  68
  69        /* register contents saved across suspend/resume: */
  70        u32 saved_register[12];
  71
  72#ifdef CONFIG_CPU_FREQ
  73        struct notifier_block freq_transition;
  74        unsigned int lcd_fck_rate;
  75#endif
  76
  77        struct workqueue_struct *wq;
  78
  79        struct drm_fbdev_cma *fbdev;
  80
  81        struct drm_crtc *crtc;
  82
  83        unsigned int num_encoders;
  84        struct drm_encoder *encoders[8];
  85
  86        unsigned int num_connectors;
  87        struct drm_connector *connectors[8];
  88        const struct drm_connector_helper_funcs *connector_funcs[8];
  89
  90        bool is_componentized;
  91};
  92
  93/* Sub-module for display.  Since we don't know at compile time what panels
  94 * or display adapter(s) might be present (for ex, off chip dvi/tfp410,
  95 * hdmi encoder, various lcd panels), the connector/encoder(s) are split into
  96 * separate drivers.  If they are probed and found to be present, they
  97 * register themselves with tilcdc_register_module().
  98 */
  99struct tilcdc_module;
 100
 101struct tilcdc_module_ops {
 102        /* create appropriate encoders/connectors: */
 103        int (*modeset_init)(struct tilcdc_module *mod, struct drm_device *dev);
 104#ifdef CONFIG_DEBUG_FS
 105        /* create debugfs nodes (can be NULL): */
 106        int (*debugfs_init)(struct tilcdc_module *mod, struct drm_minor *minor);
 107        /* cleanup debugfs nodes (can be NULL): */
 108        void (*debugfs_cleanup)(struct tilcdc_module *mod, struct drm_minor *minor);
 109#endif
 110};
 111
 112struct tilcdc_module {
 113        const char *name;
 114        struct list_head list;
 115        const struct tilcdc_module_ops *funcs;
 116        unsigned int preferred_bpp;
 117};
 118
 119void tilcdc_module_init(struct tilcdc_module *mod, const char *name,
 120                const struct tilcdc_module_ops *funcs);
 121void tilcdc_module_cleanup(struct tilcdc_module *mod);
 122
 123/* Panel config that needs to be set in the crtc, but is not coming from
 124 * the mode timings.  The display module is expected to call
 125 * tilcdc_crtc_set_panel_info() to set this during modeset.
 126 */
 127struct tilcdc_panel_info {
 128
 129        /* AC Bias Pin Frequency */
 130        uint32_t ac_bias;
 131
 132        /* AC Bias Pin Transitions per Interrupt */
 133        uint32_t ac_bias_intrpt;
 134
 135        /* DMA burst size */
 136        uint32_t dma_burst_sz;
 137
 138        /* Bits per pixel */
 139        uint32_t bpp;
 140
 141        /* FIFO DMA Request Delay */
 142        uint32_t fdd;
 143
 144        /* TFT Alternative Signal Mapping (Only for active) */
 145        bool tft_alt_mode;
 146
 147        /* Invert pixel clock */
 148        bool invert_pxl_clk;
 149
 150        /* Horizontal and Vertical Sync Edge: 0=rising 1=falling */
 151        uint32_t sync_edge;
 152
 153        /* Horizontal and Vertical Sync: Control: 0=ignore */
 154        uint32_t sync_ctrl;
 155
 156        /* Raster Data Order Select: 1=Most-to-least 0=Least-to-most */
 157        uint32_t raster_order;
 158
 159        /* DMA FIFO threshold */
 160        uint32_t fifo_th;
 161};
 162
 163#define DBG(fmt, ...) DRM_DEBUG(fmt"\n", ##__VA_ARGS__)
 164
 165struct drm_crtc *tilcdc_crtc_create(struct drm_device *dev);
 166void tilcdc_crtc_cancel_page_flip(struct drm_crtc *crtc, struct drm_file *file);
 167irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc);
 168void tilcdc_crtc_update_clk(struct drm_crtc *crtc);
 169void tilcdc_crtc_set_panel_info(struct drm_crtc *crtc,
 170                const struct tilcdc_panel_info *info);
 171void tilcdc_crtc_set_simulate_vesa_sync(struct drm_crtc *crtc,
 172                                        bool simulate_vesa_sync);
 173int tilcdc_crtc_mode_valid(struct drm_crtc *crtc, struct drm_display_mode *mode);
 174int tilcdc_crtc_max_width(struct drm_crtc *crtc);
 175
 176#endif /* __TILCDC_DRV_H__ */
 177