arch/arm/mach-omap2/display.c

   1 /*
   2  * OMAP2plus display device setup / initialization.
   3  *
   4  * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
   5  *      Senthilvadivu Guruswamy
   6  *      Sumit Semwal
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  13  * kind, whether express or implied; without even the implied warranty
  14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/io.h>
  22 #include <linux/clk.h>
  23 #include <linux/err.h>
  24
  25 #include <video/omapdss.h>
  26 #include <plat/omap_hwmod.h>
  27 #include <plat/omap_device.h>
  28 #include <plat/omap-pm.h>
  29
  30 static struct platform_device omap_display_device = {
  31         .name          = "omapdss",
  32         .id            = -1,
  33         .dev            = {
  34                 .platform_data = NULL,
  35         },
  36 };
  37
  38 static struct omap_device_pm_latency omap_dss_latency[] = {
  39         [0] = {
  40                 .deactivate_func        = omap_device_idle_hwmods,
  41                 .activate_func          = omap_device_enable_hwmods,
  42                 .flags                  = OMAP_DEVICE_LATENCY_AUTO_ADJUST,
  43         },
  44 };
  45
  46 /* oh_core is used for getting opt-clocks */
  47 static struct omap_hwmod        *oh_core;
  48
  49 static bool opt_clock_available(const char *clk_role)
  50 {
  51         int i;
  52
  53         for (i = 0; i < oh_core->opt_clks_cnt; i++) {
  54                 if (!strcmp(oh_core->opt_clks[i].role, clk_role))
  55                         return true;
  56         }
  57         return false;
  58 }
  59
  60 struct omap_dss_hwmod_data {
  61         const char *oh_name;
  62         const char *dev_name;
  63         const int id;
  64 };
  65
  66 static const struct omap_dss_hwmod_data omap2_dss_hwmod_data[] __initdata = {
  67         { "dss_core", "omapdss_dss", -1 },
  68         { "dss_dispc", "omapdss_dispc", -1 },
  69         { "dss_rfbi", "omapdss_rfbi", -1 },
  70         { "dss_venc", "omapdss_venc", -1 },
  71 };
  72
  73 static const struct omap_dss_hwmod_data omap3_dss_hwmod_data[] __initdata = {
  74         { "dss_core", "omapdss_dss", -1 },
  75         { "dss_dispc", "omapdss_dispc", -1 },
  76         { "dss_rfbi", "omapdss_rfbi", -1 },
  77         { "dss_venc", "omapdss_venc", -1 },
  78         { "dss_dsi1", "omapdss_dsi1", -1 },
  79 };
  80
  81 static const struct omap_dss_hwmod_data omap4_dss_hwmod_data[] __initdata = {
  82         { "dss_core", "omapdss_dss", -1 },
  83         { "dss_dispc", "omapdss_dispc", -1 },
  84         { "dss_rfbi", "omapdss_rfbi", -1 },
  85         { "dss_venc", "omapdss_venc", -1 },
  86         { "dss_dsi1", "omapdss_dsi1", -1 },
  87         { "dss_dsi2", "omapdss_dsi2", -1 },
  88         { "dss_hdmi", "omapdss_hdmi", -1 },
  89 };
  90
  91 int __init omap_display_init(struct omap_dss_board_info *board_data)
  92 {
  93         int r = 0;
  94         struct omap_hwmod *oh;
  95         struct omap_device *od;
  96         int i, oh_count;
  97         struct omap_display_platform_data pdata;
  98         const struct omap_dss_hwmod_data *curr_dss_hwmod;
  99
 100         memset(&pdata, 0, sizeof(pdata));
 101
 102         if (cpu_is_omap24xx()) {
 103                 curr_dss_hwmod = omap2_dss_hwmod_data;
 104                 oh_count = ARRAY_SIZE(omap2_dss_hwmod_data);
 105         } else if (cpu_is_omap34xx()) {
 106                 curr_dss_hwmod = omap3_dss_hwmod_data;
 107                 oh_count = ARRAY_SIZE(omap3_dss_hwmod_data);
 108         } else {
 109                 curr_dss_hwmod = omap4_dss_hwmod_data;
 110                 oh_count = ARRAY_SIZE(omap4_dss_hwmod_data);
 111         }
 112
 113         /* opt_clks are always associated with dss hwmod */
 114         oh_core = omap_hwmod_lookup("dss_core");
 115         if (!oh_core) {
 116                 pr_err("Could not look up dss_core.\n");
 117                 return -ENODEV;
 118         }
 119
 120         pdata.board_data = board_data;
 121         pdata.board_data->get_context_loss_count =
 122                 omap_pm_get_dev_context_loss_count;
 123         pdata.opt_clock_available = opt_clock_available;
 124
 125         for (i = 0; i < oh_count; i++) {
 126                 oh = omap_hwmod_lookup(curr_dss_hwmod[i].oh_name);
 127                 if (!oh) {
 128                         pr_err("Could not look up %s\n",
 129                                 curr_dss_hwmod[i].oh_name);
 130                         return -ENODEV;
 131                 }
 132
 133                 od = omap_device_build(curr_dss_hwmod[i].dev_name,
 134                                 curr_dss_hwmod[i].id, oh, &pdata,
 135                                 sizeof(struct omap_display_platform_data),
 136                                 omap_dss_latency,
 137                                 ARRAY_SIZE(omap_dss_latency), 0);
 138
 139                 if (WARN((IS_ERR(od)), "Could not build omap_device for %s\n",
 140                                 curr_dss_hwmod[i].oh_name))
 141                         return -ENODEV;
 142         }
 143         omap_display_device.dev.platform_data = board_data;
 144
 145         r = platform_device_register(&omap_display_device);
 146         if (r < 0)
 147                 printk(KERN_ERR "Unable to register OMAP-Display device\n");
 148
 149         return r;
 150 }