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memory: tegra124-emc: Make driver modular

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Add modularization support to the Tegra124 EMC driver, which now can be
compiled as a loadable kernel module.

Note that EMC clock must be registered at clk-init time, otherwise PLLM
will be disabled as unused clock at boot time if EMC driver is compiled
as a module. Hence add a prepare/complete callbacks. similarly to what is
done for the Tegra20/30 EMC drivers.

Tested-by: Nicolas Chauvet <kwizart@gmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20201228154920.18846-2-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
This commit is contained in:
Dmitry Osipenko
2020-12-28 18:49:16 +03:00
committed by Krzysztof Kozlowski
parent 5c8fe583cc
commit 281462e593
9 changed files with 106 additions and 42 deletions
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3
drivers/memory/tegra/Kconfig
View File

@@ -32,9 +32,10 @@ config TEGRA30_EMC
external memory.
config TEGRA124_EMC
bool "NVIDIA Tegra124 External Memory Controller driver"
tristate "NVIDIA Tegra124 External Memory Controller driver"
default y
depends on TEGRA_MC && ARCH_TEGRA_124_SOC
select TEGRA124_CLK_EMC
help
This driver is for the External Memory Controller (EMC) found on
Tegra124 chips. The EMC controls the external DRAM on the board.

31
drivers/memory/tegra/tegra124-emc.c
View File

@@ -9,16 +9,17 @@
#include <linux/clk-provider.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/clk/tegra.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/sort.h>
#include <linux/string.h>
#include <soc/tegra/emc.h>
#include <soc/tegra/fuse.h>
#include <soc/tegra/mc.h>
@@ -562,8 +563,8 @@ static struct emc_timing *tegra_emc_find_timing(struct tegra_emc *emc,
return timing;
}
int tegra_emc_prepare_timing_change(struct tegra_emc *emc,
unsigned long rate)
static int tegra_emc_prepare_timing_change(struct tegra_emc *emc,
unsigned long rate)
{
struct emc_timing *timing = tegra_emc_find_timing(emc, rate);
struct emc_timing *last = &emc->last_timing;
@@ -790,8 +791,8 @@ int tegra_emc_prepare_timing_change(struct tegra_emc *emc,
return 0;
}
void tegra_emc_complete_timing_change(struct tegra_emc *emc,
unsigned long rate)
static void tegra_emc_complete_timing_change(struct tegra_emc *emc,
unsigned long rate)
{
struct emc_timing *timing = tegra_emc_find_timing(emc, rate);
struct emc_timing *last = &emc->last_timing;
@@ -987,6 +988,7 @@ static const struct of_device_id tegra_emc_of_match[] = {
{ .compatible = "nvidia,tegra132-emc" },
{}
};
MODULE_DEVICE_TABLE(of, tegra_emc_of_match);
static struct device_node *
tegra_emc_find_node_by_ram_code(struct device_node *node, u32 ram_code)
@@ -1226,9 +1228,19 @@ static int tegra_emc_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, emc);
tegra124_clk_set_emc_callbacks(tegra_emc_prepare_timing_change,
tegra_emc_complete_timing_change);
if (IS_ENABLED(CONFIG_DEBUG_FS))
emc_debugfs_init(&pdev->dev, emc);
/*
* Don't allow the kernel module to be unloaded. Unloading adds some
* extra complexity which doesn't really worth the effort in a case of
* this driver.
*/
try_module_get(THIS_MODULE);
return 0;
};
@@ -1240,9 +1252,8 @@ static struct platform_driver tegra_emc_driver = {
.suppress_bind_attrs = true,
},
};
module_platform_driver(tegra_emc_driver);
static int tegra_emc_init(void)
{
return platform_driver_register(&tegra_emc_driver);
}
subsys_initcall(tegra_emc_init);
MODULE_AUTHOR("Mikko Perttunen <mperttunen@nvidia.com>");
MODULE_DESCRIPTION("NVIDIA Tegra124 EMC driver");
MODULE_LICENSE("GPL v2");