linux-nvgpu/drivers/gpu/nvgpu/gp106/pmu_gp106.c

/*
 * Copyright (c) 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.
 */

#include <linux/delay.h>	/* for udelay */
#include "gk20a/gk20a.h"
#include "gk20a/pmu_gk20a.h"

#include "gm206/pmu_gm206.h"
#include "gm20b/pmu_gm20b.h"
#include "gp10b/pmu_gp10b.h"
#include "gp106/pmu_gp106.h"
#include "gp106/acr_gp106.h"
#include "gp106/hw_psec_gp106.h"
#include "hw_mc_gp106.h"
#include "hw_pwr_gp106.h"

#define PMU_MEM_SCRUBBING_TIMEOUT_MAX 1000
#define PMU_MEM_SCRUBBING_TIMEOUT_DEFAULT 10

int gp106_pmu_enable_hw(struct pmu_gk20a *pmu, bool enable)
{
	struct gk20a *g = gk20a_from_pmu(pmu);

	gk20a_dbg_fn("");

	/*
	* From GP10X onwards, we are using PPWR_FALCON_ENGINE for reset. And as
	* it may come into same behaviour, reading NV_PPWR_FALCON_ENGINE again
	* after Reset.
	*/

	if (enable) {
		int retries = PMU_MEM_SCRUBBING_TIMEOUT_MAX /
				PMU_MEM_SCRUBBING_TIMEOUT_DEFAULT;
		gk20a_writel(g, pwr_falcon_engine_r(),
			pwr_falcon_engine_reset_false_f());
		gk20a_readl(g, pwr_falcon_engine_r());

		/* make sure ELPG is in a good state */
		if (g->ops.clock_gating.slcg_pmu_load_gating_prod)
			g->ops.clock_gating.slcg_pmu_load_gating_prod(g,
					g->slcg_enabled);
		if (g->ops.clock_gating.blcg_pmu_load_gating_prod)
			g->ops.clock_gating.blcg_pmu_load_gating_prod(g,
					g->blcg_enabled);

		/* wait for Scrubbing to complete */
		do {
			u32 w = gk20a_readl(g, pwr_falcon_dmactl_r()) &
				(pwr_falcon_dmactl_dmem_scrubbing_m() |
				 pwr_falcon_dmactl_imem_scrubbing_m());

			if (!w) {
				gk20a_dbg_fn("done");
				return 0;
			}
			udelay(PMU_MEM_SCRUBBING_TIMEOUT_DEFAULT);
		} while (--retries || !tegra_platform_is_silicon());

		/* If scrubbing timeout, keep PMU in reset state */
		gk20a_writel(g, pwr_falcon_engine_r(),
			pwr_falcon_engine_reset_true_f());
		gk20a_readl(g, pwr_falcon_engine_r());
		gk20a_err(dev_from_gk20a(g), "Falcon mem scrubbing timeout");
		return -ETIMEDOUT;
	} else {
		/* DISBALE */
		gk20a_writel(g, pwr_falcon_engine_r(),
			pwr_falcon_engine_reset_true_f());
		gk20a_readl(g, pwr_falcon_engine_r());
		return 0;
	}
}

static int pmu_enable(struct pmu_gk20a *pmu, bool enable)
{
	struct gk20a *g = gk20a_from_pmu(pmu);
	u32 reg_reset;
	int err;

	gk20a_dbg_fn("");

	if (!enable) {
		reg_reset = gk20a_readl(g, pwr_falcon_engine_r());
		if (reg_reset !=
			pwr_falcon_engine_reset_true_f()) {

			pmu_enable_irq(pmu, false);
			gp106_pmu_enable_hw(pmu, false);
			udelay(10);
		}
	} else {
		gp106_pmu_enable_hw(pmu, true);
		/* TBD: post reset */

		/*idle the PMU and enable interrupts on the Falcon*/
		err = pmu_idle(pmu);
		if (err)
			return err;
		udelay(5);
		pmu_enable_irq(pmu, true);
	}

	gk20a_dbg_fn("done");
	return 0;
}

int gp106_pmu_reset(struct gk20a *g)
{
	struct pmu_gk20a *pmu = &g->pmu;
	int err = 0;

	gk20a_dbg_fn("");

	err = pmu_idle(pmu);
	if (err)
		return err;

	/* TBD: release pmu hw mutex */

	err = pmu_enable(pmu, false);
	if (err)
		return err;

	/* TBD: cancel all sequences */
	/* TBD: init all sequences and state tables */
	/* TBD: restore pre-init message handler */

	err = pmu_enable(pmu, true);
	if (err)
		return err;

	return err;
}

int gp106_sec2_reset(struct gk20a *g)
{
	gk20a_dbg_fn("");
	//sec2 reset
	gk20a_writel(g, psec_falcon_engine_r(),
			pwr_falcon_engine_reset_true_f());
	udelay(10);
	gk20a_writel(g, psec_falcon_engine_r(),
			pwr_falcon_engine_reset_false_f());

	gk20a_dbg_fn("done");
	return 0;
}

static int gp106_falcon_reset(struct gk20a *g)
{
	gk20a_dbg_fn("");

	gp106_pmu_reset(g);
	gp106_sec2_reset(g);

	gk20a_dbg_fn("done");
	return 0;
}

void gp106_init_pmu_ops(struct gpu_ops *gops)
{
	gk20a_dbg_fn("");

	if (gops->privsecurity) {
		gp106_init_secure_pmu(gops);
		gops->pmu.init_wpr_region = gm20b_pmu_init_acr;
		gops->pmu.load_lsfalcon_ucode = gm206_load_falcon_ucode;
		gops->pmu.is_lazy_bootstrap = gm206_is_lazy_bootstrap;
		gops->pmu.is_priv_load = gm206_is_priv_load;
	} else {
		gk20a_init_pmu_ops(gops);
		gops->pmu.pmu_setup_hw_and_bootstrap =
			gm20b_init_nspmu_setup_hw1;
		gops->pmu.load_lsfalcon_ucode = NULL;
		gops->pmu.init_wpr_region = NULL;
	}
	gops->pmu.pmu_setup_elpg = NULL;
	gops->pmu.lspmuwprinitdone = 0;
	gops->pmu.fecsbootstrapdone = false;
	gops->pmu.write_dmatrfbase = gp10b_write_dmatrfbase;
	gops->pmu.pmu_elpg_statistics = NULL;
	gops->pmu.pmu_pg_grinit_param = NULL;
	gops->pmu.send_lrf_tex_ltc_dram_overide_en_dis_cmd = NULL;
	gops->pmu.dump_secure_fuses = NULL;
	gops->pmu.reset = gp106_falcon_reset;

	gk20a_dbg_fn("done");
}