/*
 * drivers/video/tegra/host/gk20a/gk20a_sysfs.c
 *
 * GK20A Graphics
 *
 * Copyright (c) 2011-2014, NVIDIA CORPORATION.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/kernel.h>
#include <linux/fb.h>
#include <linux/gk20a.h>

#include <mach/clk.h>

#include "gk20a.h"
#include "gr_gk20a.h"
#include "fifo_gk20a.h"


#define PTIMER_FP_FACTOR			1000000
/* PTIMER_REF_FREQ_HZ corresponds to a period of 32 nanoseconds. 32 ns is
   the resolution of ptimer. */
#define PTIMER_REF_FREQ_HZ			31250000

#define ROOTRW (S_IRWXU|S_IRGRP|S_IROTH)

static ssize_t elcg_enable_store(struct device *device,
	struct device_attribute *attr, const char *buf, size_t count)
{
	struct platform_device *ndev = to_platform_device(device);
	struct gk20a *g = get_gk20a(ndev);
	unsigned long val = 0;

	if (kstrtoul(buf, 10, &val) < 0)
		return -EINVAL;

	gk20a_busy(g->dev);
	if (val) {
		g->elcg_enabled = true;
		gr_gk20a_init_elcg_mode(g, ELCG_AUTO, ENGINE_GR_GK20A);
		gr_gk20a_init_elcg_mode(g, ELCG_AUTO, ENGINE_CE2_GK20A);
	} else {
		g->elcg_enabled = false;
		gr_gk20a_init_elcg_mode(g, ELCG_RUN, ENGINE_GR_GK20A);
		gr_gk20a_init_elcg_mode(g, ELCG_RUN, ENGINE_CE2_GK20A);
	}
	gk20a_idle(g->dev);

	dev_info(device, "ELCG is %s.\n", g->elcg_enabled ? "enabled" :
			"disabled");

	return count;
}

static ssize_t elcg_enable_read(struct device *device,
	struct device_attribute *attr, char *buf)
{
	struct platform_device *ndev = to_platform_device(device);
	struct gk20a *g = get_gk20a(ndev);

	return sprintf(buf, "%d\n", g->elcg_enabled ? 1 : 0);
}

static DEVICE_ATTR(elcg_enable, ROOTRW, elcg_enable_read, elcg_enable_store);

static ssize_t blcg_enable_store(struct device *device,
	struct device_attribute *attr, const char *buf, size_t count)
{
	struct platform_device *ndev = to_platform_device(device);
	struct gk20a *g = get_gk20a(ndev);
	unsigned long val = 0;

	if (kstrtoul(buf, 10, &val) < 0)
		return -EINVAL;

	if (val)
		g->blcg_enabled = true;
	else
		g->blcg_enabled = false;

	gk20a_busy(g->dev);
	g->ops.clock_gating.blcg_gr_load_gating_prod(g, g->blcg_enabled);
	gk20a_idle(g->dev);

	dev_info(device, "BLCG is %s.\n", g->blcg_enabled ? "enabled" :
			"disabled");

	return count;
}

static ssize_t blcg_enable_read(struct device *device,
	struct device_attribute *attr, char *buf)
{
	struct platform_device *ndev = to_platform_device(device);
	struct gk20a *g = get_gk20a(ndev);

	return sprintf(buf, "%d\n", g->blcg_enabled ? 1 : 0);
}


static DEVICE_ATTR(blcg_enable, ROOTRW, blcg_enable_read, blcg_enable_store);

static ssize_t slcg_enable_store(struct device *device,
	struct device_attribute *attr, const char *buf, size_t count)
{
	struct platform_device *ndev = to_platform_device(device);
	struct gk20a *g = get_gk20a(ndev);
	unsigned long val = 0;

	if (kstrtoul(buf, 10, &val) < 0)
		return -EINVAL;

	if (val)
		g->slcg_enabled = true;
	else
		g->slcg_enabled = false;

	/*
	 * TODO: slcg_therm_load_gating is not enabled anywhere during
	 * init. Therefore, it would be incongruous to add it here. Once
	 * it is added to init, we should add it here too.
	 */
	gk20a_busy(g->dev);
	g->ops.clock_gating.slcg_gr_load_gating_prod(g, g->slcg_enabled);
	g->ops.clock_gating.slcg_perf_load_gating_prod(g, g->slcg_enabled);
	gk20a_idle(g->dev);

	dev_info(device, "SLCG is %s.\n", g->slcg_enabled ? "enabled" :
			"disabled");

	return count;
}

static ssize_t slcg_enable_read(struct device *device,
	struct device_attribute *attr, char *buf)
{
	struct platform_device *ndev = to_platform_device(device);
	struct gk20a *g = get_gk20a(ndev);

	return sprintf(buf, "%d\n", g->slcg_enabled ? 1 : 0);
}

static DEVICE_ATTR(slcg_enable, ROOTRW, slcg_enable_read, slcg_enable_store);

static ssize_t ptimer_scale_factor_show(struct device *dev,
						struct device_attribute *attr,
						char *buf)
{
	u32 tsc_freq_hz = clk_get_rate(clk_get_sys(NULL, "clk_m"));
	u32 scaling_factor_fp = (u32)(PTIMER_REF_FREQ_HZ) /
				((u32)(tsc_freq_hz) /
				(u32)(PTIMER_FP_FACTOR));
	ssize_t res = snprintf(buf,
				PAGE_SIZE,
				"%u.%u\n",
				scaling_factor_fp / PTIMER_FP_FACTOR,
				scaling_factor_fp % PTIMER_FP_FACTOR);

	return res;
}

static DEVICE_ATTR(ptimer_scale_factor,
			S_IRUGO,
			ptimer_scale_factor_show,
			NULL);

static ssize_t railgate_delay_store(struct device *dev,
				    struct device_attribute *attr,
				    const char *buf, size_t count)
{
	struct gk20a_platform *platform = dev_get_drvdata(dev);
	int railgate_delay = 0, ret = 0;

	if (!platform->can_railgate) {
		dev_info(dev, "does not support power-gating\n");
		return count;
	}

	ret = sscanf(buf, "%d", &railgate_delay);
	if (ret == 1 && railgate_delay >= 0) {
		struct generic_pm_domain *genpd = pd_to_genpd(dev->pm_domain);
		platform->railgate_delay = railgate_delay;
		pm_genpd_set_poweroff_delay(genpd, platform->railgate_delay);
	} else
		dev_err(dev, "Invalid powergate delay\n");

	return count;
}
static ssize_t railgate_delay_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct gk20a_platform *platform = dev_get_drvdata(dev);
	return snprintf(buf, PAGE_SIZE, "%d\n", platform->railgate_delay);
}
static DEVICE_ATTR(railgate_delay, ROOTRW, railgate_delay_show,
		   railgate_delay_store);

static ssize_t clockgate_delay_store(struct device *dev,
				     struct device_attribute *attr,
				     const char *buf, size_t count)
{
	struct gk20a_platform *platform = dev_get_drvdata(dev);
	int clockgate_delay = 0, ret = 0;

	ret = sscanf(buf, "%d", &clockgate_delay);
	if (ret == 1 && clockgate_delay >= 0) {
		platform->clockgate_delay = clockgate_delay;
		pm_runtime_set_autosuspend_delay(dev,
						 platform->clockgate_delay);
	} else
		dev_err(dev, "Invalid clockgate delay\n");

	return count;
}
static ssize_t clockgate_delay_show(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	struct gk20a_platform *platform = dev_get_drvdata(dev);
	return snprintf(buf, PAGE_SIZE, "%d\n", platform->clockgate_delay);
}
static DEVICE_ATTR(clockgate_delay, ROOTRW, clockgate_delay_show,
		   clockgate_delay_store);

static ssize_t counters_show(struct device *dev,
			     struct device_attribute *attr, char *buf)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct gk20a *g = get_gk20a(pdev);
	u32 busy_cycles, total_cycles;
	ssize_t res;

	gk20a_pmu_get_load_counters(g, &busy_cycles, &total_cycles);

	res = snprintf(buf, PAGE_SIZE, "%u %u\n", busy_cycles, total_cycles);

	return res;
}

static DEVICE_ATTR(counters, S_IRUGO, counters_show, NULL);
static ssize_t counters_show_reset(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	ssize_t res = counters_show(dev, attr, buf);
	struct platform_device *pdev = to_platform_device(dev);
	struct gk20a *g = get_gk20a(pdev);

	gk20a_pmu_reset_load_counters(g);

	return res;
}

static DEVICE_ATTR(counters_reset, S_IRUGO, counters_show_reset, NULL);

static ssize_t elpg_enable_store(struct device *device,
	struct device_attribute *attr, const char *buf, size_t count)
{
	struct platform_device *ndev = to_platform_device(device);
	struct gk20a *g = get_gk20a(ndev);
	unsigned long val = 0;
	int err;

	if (kstrtoul(buf, 10, &val) < 0)
		return -EINVAL;

	/*
	 * Since elpg is refcounted, we should not unnecessarily call
	 * enable/disable if it is already so.
	 */
	err = gk20a_busy(g->dev);
	if (err)
		return -EAGAIN;

	if (val && !g->elpg_enabled) {
		g->elpg_enabled = true;
		gk20a_pmu_enable_elpg(g);
	} else if (!val && g->elpg_enabled) {
		g->elpg_enabled = false;
		gk20a_pmu_disable_elpg(g);
	}
	gk20a_idle(g->dev);

	dev_info(device, "ELPG is %s.\n", g->elpg_enabled ? "enabled" :
			"disabled");

	return count;
}

static ssize_t elpg_enable_read(struct device *device,
	struct device_attribute *attr, char *buf)
{
	struct platform_device *ndev = to_platform_device(device);
	struct gk20a *g = get_gk20a(ndev);

	return sprintf(buf, "%d\n", g->elpg_enabled ? 1 : 0);
}

static DEVICE_ATTR(elpg_enable, ROOTRW, elpg_enable_read, elpg_enable_store);

static ssize_t force_idle_store(struct device *device,
	struct device_attribute *attr, const char *buf, size_t count)
{
	struct platform_device *ndev = to_platform_device(device);
	struct gk20a *g = get_gk20a(ndev);
	unsigned long val = 0;
	int err = 0;

	if (kstrtoul(buf, 10, &val) < 0)
		return -EINVAL;

	if (val) {
		if (g->forced_idle)
			return count; /* do nothing */
		else {
			err = gk20a_do_idle();
			if (!err) {
				g->forced_idle = 1;
				dev_info(device, "gpu is idle : %d\n",
					g->forced_idle);
			}
		}
	} else {
		if (!g->forced_idle)
			return count; /* do nothing */
		else {
			err = gk20a_do_unidle();
			if (!err) {
				g->forced_idle = 0;
				dev_info(device, "gpu is idle : %d\n",
					g->forced_idle);
			}
		}
	}

	return count;
}

static ssize_t force_idle_read(struct device *device,
	struct device_attribute *attr, char *buf)
{
	struct platform_device *ndev = to_platform_device(device);
	struct gk20a *g = get_gk20a(ndev);

	return sprintf(buf, "%d\n", g->forced_idle ? 1 : 0);
}

static DEVICE_ATTR(force_idle, ROOTRW, force_idle_read, force_idle_store);

void gk20a_remove_sysfs(struct device *dev)
{
	device_remove_file(dev, &dev_attr_elcg_enable);
	device_remove_file(dev, &dev_attr_blcg_enable);
	device_remove_file(dev, &dev_attr_slcg_enable);
	device_remove_file(dev, &dev_attr_ptimer_scale_factor);
	device_remove_file(dev, &dev_attr_elpg_enable);
	device_remove_file(dev, &dev_attr_counters);
	device_remove_file(dev, &dev_attr_counters_reset);
	device_remove_file(dev, &dev_attr_railgate_delay);
	device_remove_file(dev, &dev_attr_clockgate_delay);
	device_remove_file(dev, &dev_attr_force_idle);
}

void gk20a_create_sysfs(struct platform_device *dev)
{
	int error = 0;

	error |= device_create_file(&dev->dev, &dev_attr_elcg_enable);
	error |= device_create_file(&dev->dev, &dev_attr_blcg_enable);
	error |= device_create_file(&dev->dev, &dev_attr_slcg_enable);
	error |= device_create_file(&dev->dev, &dev_attr_ptimer_scale_factor);
	error |= device_create_file(&dev->dev, &dev_attr_elpg_enable);
	error |= device_create_file(&dev->dev, &dev_attr_counters);
	error |= device_create_file(&dev->dev, &dev_attr_counters_reset);
	error |= device_create_file(&dev->dev, &dev_attr_railgate_delay);
	error |= device_create_file(&dev->dev, &dev_attr_clockgate_delay);
	error |= device_create_file(&dev->dev, &dev_attr_force_idle);

	if (error)
		dev_err(&dev->dev, "Failed to create sysfs attributes!\n");
}