/*
 *
 * (C) COPYRIGHT 2014 ARM Limited. All rights reserved.
 *
 * This program is free software and is provided to you under the terms of the
 * GNU General Public License version 2 as published by the Free Software
 * Foundation, and any use by you of this program is subject to the terms
 * of such GNU licence.
 *
 * A copy of the licence is included with the program, and can also be obtained
 * from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA  02110-1301, USA.
 *
 */


#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/scpi_protocol.h>
#include <linux/version.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 13, 0)
#include <linux/pm_opp.h>
#else /* Linux >= 3.13 */
/* In 3.13 the OPP include header file, types, and functions were all
 * renamed. Use the old filename for the include, and define the new names to
 * the old, when an old kernel is detected.
 */
#include <linux/opp.h>
#define dev_pm_opp_add opp_add
#endif /* Linux >= 3.13 */


static int init_juno_opps_from_scpi(struct device *dev)
{
	struct scpi_opp *sopp;
	int i;

	/* Hard coded for Juno. 2 is GPU domain */
	sopp = scpi_dvfs_get_opps(2);
	if (IS_ERR_OR_NULL(sopp))
		return PTR_ERR(sopp);

	for (i = 0; i < sopp->count; i++) {
		struct scpi_opp_entry *e = &sopp->opp[i];

		dev_info(dev, "Mali OPP from SCPI: %u Hz @ %u mV\n",
				e->freq_hz, e->volt_mv);

		dev_pm_opp_add(dev, e->freq_hz, e->volt_mv * 1000);
	}

	return 0;
}

static int juno_setup_opps(void)
{
	struct device_node *np;
	struct platform_device *pdev;
	int err;

	np = of_find_node_by_name(NULL, "gpu");
	if (!np) {
		pr_err("Failed to find DT entry for Mali\n");
		return -EFAULT;
	}

	pdev = of_find_device_by_node(np);
	if (!pdev) {
		pr_err("Failed to find device for Mali\n");
		of_node_put(np);
		return -EFAULT;
	}

	err = init_juno_opps_from_scpi(&pdev->dev);

	of_node_put(np);

	return err;
}

module_init(juno_setup_opps);
MODULE_LICENSE("GPL");