/*
 * Remote processor resources
 *
 * Copyright (C) 2011 Texas Instruments, Inc.
 * Copyright (C) 2011 Google, Inc.
 *
 * Fernando Guzman Lugo <fernando.lugo@ti.com>
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <plat/omap_device.h>
#include <plat/omap_hwmod.h>
#include <plat/clock.h>
#include <plat/rpres.h>
#include <linux/pm_qos_params.h>
#include <plat/common.h>
#include <plat/omap-pm.h>
#include "../../arch/arm/mach-omap2/dvfs.h"

static void _enable_optional_clocks(struct omap_hwmod *oh)
{
	struct omap_hwmod_opt_clk *oc;
	int i;

	pr_debug("%s: %s: enabling optional clocks\n", __func__, oh->name);

	for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
		if (oc->_clk)
			clk_enable(oc->_clk);
}

static void _disable_optional_clocks(struct omap_hwmod *oh)
{
	struct omap_hwmod_opt_clk *oc;
	int i;

	pr_debug("%s: %s: disabling optional clocks\n", __func__, oh->name);

	for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
		if (oc->_clk)
			clk_disable(oc->_clk);
}

static int rpres_iss_enable(struct platform_device *pdev)
{
	int ret;
	struct rpres_platform_data *pdata = pdev->dev.platform_data;

	ret = omap_device_enable(pdev);
	if (!ret)
		_enable_optional_clocks(pdata->oh);

	return ret;
}

static int rpres_iss_shutdown(struct platform_device *pdev)
{
	int ret;
	struct rpres_platform_data *pdata = pdev->dev.platform_data;

	omap_hwmod_reset(pdata->oh);

	ret = omap_device_idle(pdev);
	if (!ret)
		_disable_optional_clocks(pdata->oh);

	return ret;
}

static int rpres_fdif_shutdown(struct platform_device *pdev)
{
	struct rpres_platform_data *pdata = pdev->dev.platform_data;

	omap_hwmod_reset(pdata->oh);

	return omap_device_idle(pdev);
}

static int rpres_scale_dev(struct platform_device *pdev, long val)
{
	return omap_device_scale(&pdev->dev, &pdev->dev, val);
}

static int rpres_set_dev_lat(struct platform_device *pdev, long val)
{
	return omap_pm_set_max_dev_wakeup_lat(&pdev->dev, &pdev->dev, val);
}

static int rpres_set_l3_bw(struct platform_device *pdev, long val)
{
	return omap_pm_set_min_bus_tput(&pdev->dev, OCP_INITIATOR_AGENT, val);
}

static struct rpres_ops iss_ops = {
	.start = rpres_iss_enable,
	.stop = rpres_iss_shutdown,
	.set_lat = rpres_set_dev_lat,
	.set_bw = rpres_set_l3_bw,
};

static struct rpres_ops ivahd_ops = {
	.start = omap_device_enable,
	.stop = omap_device_shutdown,
	.set_lat = rpres_set_dev_lat,
	.set_bw = rpres_set_l3_bw,
	.scale_dev = rpres_scale_dev,
};

static struct rpres_ops fdif_ops = {
	.start = omap_device_enable,
	.stop = rpres_fdif_shutdown,
	.set_lat = rpres_set_dev_lat,
	.set_bw = rpres_set_l3_bw,
	.scale_dev = rpres_scale_dev,
};

static struct rpres_ops gen_ops = {
	.start = omap_device_enable,
	.stop = omap_device_shutdown,
};

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

static struct rpres_platform_data rpres_data[] = {
	{
		.name = "rpres_iva",
		.oh_name = "iva",
		.ops = &ivahd_ops,
		.get_dev = omap2_get_iva_device,
	},
	{
		.name = "rpres_iva_seq0",
		.oh_name = "iva_seq0",
		.ops = &gen_ops,
	},
	{
		.name = "rpres_iva_seq1",
		.oh_name = "iva_seq1",
		.ops = &gen_ops,
	},
	{
		.name = "rpres_iss",
		.oh_name = "iss",
		.ops = &iss_ops,
		.opt_clk_name = "ctrlclk",
	},
	{
		.name = "rpres_fdif",
		.oh_name = "fdif",
		.ops = &fdif_ops,
		.get_dev = omap4_get_fdif_device,
	},
	{
		.name = "rpres_sl2if",
		.oh_name = "sl2if",
		.ops = &gen_ops,
	},
};

static int __init init(void)
{
	int i, ret;
	struct omap_hwmod *oh;
	struct omap_device_pm_latency *ohl = rpres_latency;
	int ohl_cnt = ARRAY_SIZE(rpres_latency);
	struct omap_device *od;
	struct device *dev;
	struct platform_device *pdev;

	for (i = 0; i < ARRAY_SIZE(rpres_data); i++) {
		oh = omap_hwmod_lookup(rpres_data[i].oh_name);
		if (!oh) {
			pr_err("No hdmod for %s\n", rpres_data[i].name);
			continue;
		}
		rpres_data[i].oh = oh;

		if (rpres_data[i].get_dev) {
			dev = rpres_data[i].get_dev();
			if (!dev) {
				pr_err("No dev for %s\n", rpres_data[i].name);
				continue;
			}
			pdev = to_platform_device(dev);
			ret = platform_device_add_data(pdev, &rpres_data[i],
					sizeof(struct rpres_platform_data));
			if (ret) {
				pr_err("Error pdev add for %s\n",
							rpres_data[i].name);
				continue;
			}
			od = to_omap_device(pdev);
			od->pm_lats = ohl;
			od->pm_lats_cnt = ohl_cnt;
		} else {
			od = omap_device_build("rpres", i, oh,
					&rpres_data[i],
					sizeof(struct rpres_platform_data),
					ohl, ohl_cnt, false);
			if (IS_ERR(od))
				pr_err("Error building device for %s\n",
					 rpres_data[i].name);
		}
	}
	return 0;
}
device_initcall(init);