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 <plat/display.h>
  26 #include <plat/omap_hwmod.h>
  27 #include <plat/omap_device.h>
  28
  29 static struct platform_device omap_display_device = {
  30         .name          = "omapdss",
  31         .id            = -1,
  32         .dev            = {
  33                 .platform_data = NULL,
  34         },
  35 };
  36
  37 static struct omap_device_pm_latency omap_dss_latency[] = {
  38         [0] = {
  39                 .deactivate_func        = omap_device_idle_hwmods,
  40                 .activate_func          = omap_device_enable_hwmods,
  41                 .flags                  = OMAP_DEVICE_LATENCY_AUTO_ADJUST,
  42         },
  43 };
  44
  45 /* oh_core is used for getting opt-clocks */
  46 static struct omap_hwmod        *oh_core;
  47
  48 static bool opt_clock_available(const char *clk_role)
  49 {
  50         int i;
  51
  52         for (i = 0; i < oh_core->opt_clks_cnt; i++) {
  53                 if (!strcmp(oh_core->opt_clks[i].role, clk_role))
  54                         return true;
  55         }
  56         return false;
  57 }
  58
  59 int __init omap_display_init(struct omap_dss_board_info *board_data)
  60 {
  61         int r = 0;
  62         struct omap_hwmod *oh;
  63         struct omap_device *od;
  64         int i;
  65         struct omap_display_platform_data pdata;
  66
  67         /*
  68          * omap: valid DSS hwmod names
  69          * omap2,3,4: dss_core, dss_dispc, dss_rfbi, dss_venc
  70          * omap3,4: dss_dsi1
  71          * omap4: dss_dsi2, dss_hdmi
  72          */
  73         char *oh_name[] = { "dss_core", "dss_dispc", "dss_rfbi", "dss_venc",
  74                 "dss_dsi1", "dss_dsi2", "dss_hdmi" };
  75         char *dev_name[] = { "omapdss_dss", "omapdss_dispc", "omapdss_rfbi",
  76                 "omapdss_venc", "omapdss_dsi1", "omapdss_dsi2",
  77                 "omapdss_hdmi" };
  78         int oh_count;
  79
  80         memset(&pdata, 0, sizeof(pdata));
  81
  82         if (cpu_is_omap24xx())
  83                 oh_count = ARRAY_SIZE(oh_name) - 3;
  84                 /* last 3 hwmod dev in oh_name are not available for omap2 */
  85         else if (cpu_is_omap44xx())
  86                 oh_count = ARRAY_SIZE(oh_name);
  87         else
  88                 oh_count = ARRAY_SIZE(oh_name) - 2;
  89                 /* last 2 hwmod dev in oh_name are not available for omap3 */
  90
  91         /* opt_clks are always associated with dss hwmod */
  92         oh_core = omap_hwmod_lookup("dss_core");
  93         if (!oh_core) {
  94                 pr_err("Could not look up dss_core.\n");
  95                 return -ENODEV;
  96         }
  97
  98         pdata.board_data = board_data;
  99         pdata.board_data->get_last_off_on_transaction_id = NULL;
 100         pdata.opt_clock_available = opt_clock_available;
 101
 102         for (i = 0; i < oh_count; i++) {
 103                 oh = omap_hwmod_lookup(oh_name[i]);
 104                 if (!oh) {
 105                         pr_err("Could not look up %s\n", oh_name[i]);
 106                         return -ENODEV;
 107                 }
 108
 109                 od = omap_device_build(dev_name[i], -1, oh, &pdata,
 110                                 sizeof(struct omap_display_platform_data),
 111                                 omap_dss_latency,
 112                                 ARRAY_SIZE(omap_dss_latency), 0);
 113
 114                 if (WARN((IS_ERR(od)), "Could not build omap_device for %s\n",
 115                                 oh_name[i]))
 116                         return -ENODEV;
 117         }
 118         omap_display_device.dev.platform_data = board_data;
 119
 120         r = platform_device_register(&omap_display_device);
 121         if (r < 0)
 122                 printk(KERN_ERR "Unable to register OMAP-Display device\n");
 123
 124         return r;
 125 }