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memory: tegra: Introduce memory client hot reset

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In order to reset busy HW properly, memory controller needs to be
involved, otherwise it is possible to get corrupted memory or hang machine
if HW was reset during DMA. Introduce memory client 'hot reset' that will
be used for resetting of busy HW.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Dmitry Osipenko
2018-04-13 14:33:49 +03:00
committed by Thierry Reding
parent a8d502fd33
commit 20e92462cd
3 changed files with 245 additions and 0 deletions
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33
include/soc/tegra/mc.h
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@@ -9,6 +9,7 @@
#ifndef __SOC_TEGRA_MC_H__
#define __SOC_TEGRA_MC_H__
#include <linux/reset-controller.h>
#include <linux/types.h>
struct clk;
@@ -95,6 +96,30 @@ static inline void tegra_smmu_remove(struct tegra_smmu *smmu)
}
#endif
struct tegra_mc_reset {
const char *name;
unsigned long id;
unsigned int control;
unsigned int status;
unsigned int reset;
unsigned int bit;
};
struct tegra_mc_reset_ops {
int (*hotreset_assert)(struct tegra_mc *mc,
const struct tegra_mc_reset *rst);
int (*hotreset_deassert)(struct tegra_mc *mc,
const struct tegra_mc_reset *rst);
int (*block_dma)(struct tegra_mc *mc,
const struct tegra_mc_reset *rst);
bool (*dma_idling)(struct tegra_mc *mc,
const struct tegra_mc_reset *rst);
int (*unblock_dma)(struct tegra_mc *mc,
const struct tegra_mc_reset *rst);
int (*reset_status)(struct tegra_mc *mc,
const struct tegra_mc_reset *rst);
};
struct tegra_mc_soc {
const struct tegra_mc_client *clients;
unsigned int num_clients;
@@ -110,6 +135,10 @@ struct tegra_mc_soc {
const struct tegra_smmu_soc *smmu;
u32 intmask;
const struct tegra_mc_reset_ops *reset_ops;
const struct tegra_mc_reset *resets;
unsigned int num_resets;
};
struct tegra_mc {
@@ -124,6 +153,10 @@ struct tegra_mc {
struct tegra_mc_timing *timings;
unsigned int num_timings;
struct reset_controller_dev reset;
spinlock_t lock;
};
void tegra_mc_write_emem_configuration(struct tegra_mc *mc, unsigned long rate);