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memory: tegra30-emc: Make driver modular 

Add modularization support to the Tegra30 EMC driver, which now can be
compiled as a loadable kernel module.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20201111011456.7875-8-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
This commit is contained in:
Dmitry Osipenko 2020-11-11 04:14:37 +03:00 committed by Krzysztof Kozlowski
parent 1d1564aabc
commit 0c56eda86f
3 changed files with 16 additions and 6 deletions
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2
drivers/memory/tegra/Kconfig
View File

@ -21,7 +21,7 @@ config TEGRA20_EMC
external memory.
config TEGRA30_EMC
bool "NVIDIA Tegra30 External Memory Controller driver"
tristate "NVIDIA Tegra30 External Memory Controller driver"
default y
depends on TEGRA_MC && ARCH_TEGRA_3x_SOC
help

3
drivers/memory/tegra/mc.c
View File

@ -6,6 +6,7 @@
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/export.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
@ -346,6 +347,7 @@ int tegra_mc_write_emem_configuration(struct tegra_mc *mc, unsigned long rate)
return 0;
}
EXPORT_SYMBOL_GPL(tegra_mc_write_emem_configuration);
unsigned int tegra_mc_get_emem_device_count(struct tegra_mc *mc)
{
@ -357,6 +359,7 @@ unsigned int tegra_mc_get_emem_device_count(struct tegra_mc *mc)
return dram_count;
}
EXPORT_SYMBOL_GPL(tegra_mc_get_emem_device_count);
static int load_one_timing(struct tegra_mc *mc,
struct tegra_mc_timing *timing,

17
drivers/memory/tegra/tegra30-emc.c
View File

@ -1330,6 +1330,13 @@ static int tegra_emc_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, emc);
tegra_emc_debugfs_init(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;
unset_cb:
@ -1380,6 +1387,7 @@ static const struct of_device_id tegra_emc_of_match[] = {
{ .compatible = "nvidia,tegra30-emc", },
{},
};
MODULE_DEVICE_TABLE(of, tegra_emc_of_match);
static struct platform_driver tegra_emc_driver = {
.probe = tegra_emc_probe,
@ -1390,9 +1398,8 @@ static struct platform_driver tegra_emc_driver = {
.suppress_bind_attrs = true,
},
};
module_platform_driver(tegra_emc_driver);
static int __init tegra_emc_init(void)
{
return platform_driver_register(&tegra_emc_driver);
}
subsys_initcall(tegra_emc_init);
MODULE_AUTHOR("Dmitry Osipenko <digetx@gmail.com>");
MODULE_DESCRIPTION("NVIDIA Tegra30 EMC driver");
MODULE_LICENSE("GPL v2");