/*
 * drivers/video/tegra/host/gk20a/ltc_common.c
 *
 * GK20A Graphics
 *
 * Copyright (c) 2011-2016, 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/dma-mapping.h>
#include <linux/delay.h>

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

/*
 * Sets the ZBC color for the passed index.
 */
static void gk20a_ltc_set_zbc_color_entry(struct gk20a *g,
					  struct zbc_entry *color_val,
					  u32 index)
{
	u32 i;
	u32 real_index = index + GK20A_STARTOF_ZBC_TABLE;

	gk20a_writel(g, ltc_ltcs_ltss_dstg_zbc_index_r(),
		     ltc_ltcs_ltss_dstg_zbc_index_address_f(real_index));

	for (i = 0;
	     i < ltc_ltcs_ltss_dstg_zbc_color_clear_value__size_1_v(); i++) {
		gk20a_writel(g, ltc_ltcs_ltss_dstg_zbc_color_clear_value_r(i),
			     color_val->color_l2[i]);
	}
	gk20a_readl(g, ltc_ltcs_ltss_dstg_zbc_index_r());
}

/*
 * Sets the ZBC depth for the passed index.
 */
static void gk20a_ltc_set_zbc_depth_entry(struct gk20a *g,
					  struct zbc_entry *depth_val,
					  u32 index)
{
	u32 real_index = index + GK20A_STARTOF_ZBC_TABLE;

	gk20a_writel(g, ltc_ltcs_ltss_dstg_zbc_index_r(),
		     ltc_ltcs_ltss_dstg_zbc_index_address_f(real_index));

	gk20a_writel(g, ltc_ltcs_ltss_dstg_zbc_depth_clear_value_r(),
		     depth_val->depth);

	gk20a_readl(g, ltc_ltcs_ltss_dstg_zbc_index_r());
}

static int gk20a_ltc_alloc_phys_cbc(struct gk20a *g,
				    size_t compbit_backing_size)
{
	struct gr_gk20a *gr = &g->gr;

	return gk20a_gmmu_alloc_attr_sys(g, DMA_ATTR_FORCE_CONTIGUOUS,
				    compbit_backing_size,
				    &gr->compbit_store.mem);
}

static int gk20a_ltc_alloc_virt_cbc(struct gk20a *g,
				    size_t compbit_backing_size)
{
	struct gr_gk20a *gr = &g->gr;

	return gk20a_gmmu_alloc_attr_sys(g, DMA_ATTR_NO_KERNEL_MAPPING,
				    compbit_backing_size,
				    &gr->compbit_store.mem);
}

static void gk20a_ltc_init_cbc(struct gk20a *g, struct gr_gk20a *gr)
{
	u32 max_size = gr->max_comptag_mem;
	u32 max_comptag_lines = max_size << 3;

	u32 compbit_base_post_divide;
	u64 compbit_base_post_multiply64;
	u64 compbit_store_iova;
	u64 compbit_base_post_divide64;
	struct gk20a_platform *platform = dev_get_drvdata(g->dev);

	if (platform->is_fmodel)
		compbit_store_iova = gk20a_mem_phys(&gr->compbit_store.mem);
	else
		compbit_store_iova = g->ops.mm.get_iova_addr(g,
				gr->compbit_store.mem.sgt->sgl, 0);

	compbit_base_post_divide64 = compbit_store_iova >>
		ltc_ltcs_ltss_cbc_base_alignment_shift_v();

	do_div(compbit_base_post_divide64, g->ltc_count);
	compbit_base_post_divide = u64_lo32(compbit_base_post_divide64);

	compbit_base_post_multiply64 = ((u64)compbit_base_post_divide *
		g->ltc_count) << ltc_ltcs_ltss_cbc_base_alignment_shift_v();

	if (compbit_base_post_multiply64 < compbit_store_iova)
		compbit_base_post_divide++;

	/* Bug 1477079 indicates sw adjustment on the posted divided base. */
	if (g->ops.ltc.cbc_fix_config)
		compbit_base_post_divide =
			g->ops.ltc.cbc_fix_config(g, compbit_base_post_divide);

	gk20a_writel(g, ltc_ltcs_ltss_cbc_base_r(),
		compbit_base_post_divide);

	gk20a_dbg(gpu_dbg_info | gpu_dbg_map_v | gpu_dbg_pte,
		   "compbit base.pa: 0x%x,%08x cbc_base:0x%08x\n",
		   (u32)(compbit_store_iova >> 32),
		   (u32)(compbit_store_iova & 0xffffffff),
		   compbit_base_post_divide);

	gr->compbit_store.base_hw = compbit_base_post_divide;

	g->ops.ltc.cbc_ctrl(g, gk20a_cbc_op_invalidate,
			    0, max_comptag_lines - 1);

}

#ifdef CONFIG_DEBUG_FS
static void gk20a_ltc_sync_debugfs(struct gk20a *g)
{
	u32 reg_f = ltc_ltcs_ltss_tstg_set_mgmt_2_l2_bypass_mode_enabled_f();

	spin_lock(&g->debugfs_lock);
	if (g->mm.ltc_enabled != g->mm.ltc_enabled_debug) {
		u32 reg = gk20a_readl(g, ltc_ltcs_ltss_tstg_set_mgmt_2_r());
		if (g->mm.ltc_enabled_debug)
			/* bypass disabled (normal caching ops)*/
			reg &= ~reg_f;
		else
			/* bypass enabled (no caching) */
			reg |= reg_f;

		gk20a_writel(g, ltc_ltcs_ltss_tstg_set_mgmt_2_r(), reg);
		g->mm.ltc_enabled = g->mm.ltc_enabled_debug;
	}
	spin_unlock(&g->debugfs_lock);
}
#endif