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};
  89
  90/* Sub-module for display.  Since we don't know at compile time what panels
  91 * or display adapter(s) might be present (for ex, off chip dvi/tfp410,
  92 * hdmi encoder, various lcd panels), the connector/encoder(s) are split into
  93 * separate drivers.  If they are probed and found to be present, they
  94 * register themselves with tilcdc_register_module().
  95 */
  96struct tilcdc_module;
  97
  98struct tilcdc_module_ops {
  99        /* create appropriate encoders/connectors: */
 100        int (*modeset_init)(struct tilcdc_module *mod, struct drm_device *dev);
 101        void (*destroy)(struct tilcdc_module *mod);
 102#ifdef CONFIG_DEBUG_FS
 103        /* create debugfs nodes (can be NULL): */
 104        int (*debugfs_init)(struct tilcdc_module *mod, struct drm_minor *minor);
 105        /* cleanup debugfs nodes (can be NULL): */
 106        void (*debugfs_cleanup)(struct tilcdc_module *mod, struct drm_minor *minor);
 107#endif
 108};
 109
 110struct tilcdc_module {
 111        const char *name;
 112        struct list_head list;
 113        const struct tilcdc_module_ops *funcs;
 114        unsigned int preferred_bpp;
 115};
 116
 117void tilcdc_module_init(struct tilcdc_module *mod, const char *name,
 118                const struct tilcdc_module_ops *funcs);
 119void tilcdc_module_cleanup(struct tilcdc_module *mod);
 120void tilcdc_slave_probedefer(bool defered);
 121
 122/* Panel config that needs to be set in the crtc, but is not coming from
 123 * the mode timings.  The display module is expected to call
 124 * tilcdc_crtc_set_panel_info() to set this during modeset.
 125 */
 126struct tilcdc_panel_info {
 127
 128        /* AC Bias Pin Frequency */
 129        uint32_t ac_bias;
 130
 131        /* AC Bias Pin Transitions per Interrupt */
 132        uint32_t ac_bias_intrpt;
 133
 134        /* DMA burst size */
 135        uint32_t dma_burst_sz;
 136
 137        /* Bits per pixel */
 138        uint32_t bpp;
 139
 140        /* FIFO DMA Request Delay */
 141        uint32_t fdd;
 142
 143        /* TFT Alternative Signal Mapping (Only for active) */
 144        bool tft_alt_mode;
 145
 146        /* Invert pixel clock */
 147        bool invert_pxl_clk;
 148
 149        /* Horizontal and Vertical Sync Edge: 0=rising 1=falling */
 150        uint32_t sync_edge;
 151
 152        /* Horizontal and Vertical Sync: Control: 0=ignore */
 153        uint32_t sync_ctrl;
 154
 155        /* Raster Data Order Select: 1=Most-to-least 0=Least-to-most */
 156        uint32_t raster_order;
 157
 158        /* DMA FIFO threshold */
 159        uint32_t fifo_th;
 160};
 161
 162#define DBG(fmt, ...) DRM_DEBUG(fmt"\n", ##__VA_ARGS__)
 163
 164struct drm_crtc *tilcdc_crtc_create(struct drm_device *dev);
 165void tilcdc_crtc_cancel_page_flip(struct drm_crtc *crtc, struct drm_file *file);
 166irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc);
 167void tilcdc_crtc_update_clk(struct drm_crtc *crtc);
 168void tilcdc_crtc_set_panel_info(struct drm_crtc *crtc,
 169                const struct tilcdc_panel_info *info);
 170int tilcdc_crtc_mode_valid(struct drm_crtc *crtc, struct drm_display_mode *mode);
 171int tilcdc_crtc_max_width(struct drm_crtc *crtc);
 172
 173#endif /* __TILCDC_DRV_H__ */
 174