linux/arch/arm/mach-omap2/display.c

/*
 * OMAP2plus display device setup / initialization.
 *
 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
 *	Senthilvadivu Guruswamy
 *	Sumit Semwal
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/err.h>

#include <video/omapdss.h>
#include <plat/omap_hwmod.h>
#include <plat/omap_device.h>
#include <plat/omap-pm.h>

static struct platform_device omap_display_device = {
	.name          = "omapdss",
	.id            = -1,
	.dev            = {
		.platform_data = NULL,
	},
};

static struct omap_device_pm_latency omap_dss_latency[] = {
	[0] = {
		.deactivate_func        = omap_device_idle_hwmods,
		.activate_func          = omap_device_enable_hwmods,
		.flags			= OMAP_DEVICE_LATENCY_AUTO_ADJUST,
	},
};

/* oh_core is used for getting opt-clocks */
static struct omap_hwmod	*oh_core;

static bool opt_clock_available(const char *clk_role)
{
	int i;

	for (i = 0; i < oh_core->opt_clks_cnt; i++) {
		if (!strcmp(oh_core->opt_clks[i].role, clk_role))
			return true;
	}
	return false;
}

struct omap_dss_hwmod_data {
	const char *oh_name;
	const char *dev_name;
	const int id;
};

static const struct omap_dss_hwmod_data omap2_dss_hwmod_data[] __initdata = {
	{ "dss_core", "omapdss_dss", -1 },
	{ "dss_dispc", "omapdss_dispc", -1 },
	{ "dss_rfbi", "omapdss_rfbi", -1 },
	{ "dss_venc", "omapdss_venc", -1 },
};

static const struct omap_dss_hwmod_data omap3_dss_hwmod_data[] __initdata = {
	{ "dss_core", "omapdss_dss", -1 },
	{ "dss_dispc", "omapdss_dispc", -1 },
	{ "dss_rfbi", "omapdss_rfbi", -1 },
	{ "dss_venc", "omapdss_venc", -1 },
	{ "dss_dsi1", "omapdss_dsi1", -1 },
};

static const struct omap_dss_hwmod_data omap4_dss_hwmod_data[] __initdata = {
	{ "dss_core", "omapdss_dss", -1 },
	{ "dss_dispc", "omapdss_dispc", -1 },
	{ "dss_rfbi", "omapdss_rfbi", -1 },
	{ "dss_venc", "omapdss_venc", -1 },
	{ "dss_dsi1", "omapdss_dsi1", -1 },
	{ "dss_dsi2", "omapdss_dsi2", -1 },
	{ "dss_hdmi", "omapdss_hdmi", -1 },
};

int __init omap_display_init(struct omap_dss_board_info *board_data)
{
	int r = 0;
	struct omap_hwmod *oh;
	struct omap_device *od;
	int i, oh_count;
	struct omap_display_platform_data pdata;
	const struct omap_dss_hwmod_data *curr_dss_hwmod;

	memset(&pdata, 0, sizeof(pdata));

	if (cpu_is_omap24xx()) {
		curr_dss_hwmod = omap2_dss_hwmod_data;
		oh_count = ARRAY_SIZE(omap2_dss_hwmod_data);
	} else if (cpu_is_omap34xx()) {
		curr_dss_hwmod = omap3_dss_hwmod_data;
		oh_count = ARRAY_SIZE(omap3_dss_hwmod_data);
	} else {
		curr_dss_hwmod = omap4_dss_hwmod_data;
		oh_count = ARRAY_SIZE(omap4_dss_hwmod_data);
	}

	/* opt_clks are always associated with dss hwmod */
	oh_core = omap_hwmod_lookup("dss_core");
	if (!oh_core) {
		pr_err("Could not look up dss_core.\n");
		return -ENODEV;
	}

	pdata.board_data = board_data;
	pdata.board_data->get_context_loss_count =
		omap_pm_get_dev_context_loss_count;
	pdata.opt_clock_available = opt_clock_available;

	for (i = 0; i < oh_count; i++) {
		oh = omap_hwmod_lookup(curr_dss_hwmod[i].oh_name);
		if (!oh) {
			pr_err("Could not look up %s\n",
				curr_dss_hwmod[i].oh_name);
			return -ENODEV;
		}

		od = omap_device_build(curr_dss_hwmod[i].dev_name,
				curr_dss_hwmod[i].id, oh, &pdata,
				sizeof(struct omap_display_platform_data),
				omap_dss_latency,
				ARRAY_SIZE(omap_dss_latency), 0);

		if (WARN((IS_ERR(od)), "Could not build omap_device for %s\n",
				curr_dss_hwmod[i].oh_name))
			return -ENODEV;
	}
	omap_display_device.dev.platform_data = board_data;

	r = platform_device_register(&omap_display_device);
	if (r < 0)
		printk(KERN_ERR "Unable to register OMAP-Display device\n");

	return r;
}