Add modularization support to the Tegra30 EMC driver, which now can be
compiled as a loadable kernel module.
Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
drivers/memory/tegra/Kconfig | 2 +-
drivers/memory/tegra/mc.c | 3 +++
drivers/memory/tegra/tegra30-emc.c | 17 ++++++++++++-----
3 files changed, 16 insertions(+), 6 deletions(-)
diff --git a/drivers/memory/tegra/Kconfig b/drivers/memory/tegra/Kconfig
index 76e9a3b10839..6779a2201fe4 100644
--- a/drivers/memory/tegra/Kconfig
+++ b/drivers/memory/tegra/Kconfig
@@ -22,7 +22,7 @@ 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
diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c
index a7e6a8e4c95a..44064de962c2 100644
--- a/drivers/memory/tegra/mc.c
+++ b/drivers/memory/tegra/mc.c
@@ -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,
diff --git a/drivers/memory/tegra/tegra30-emc.c b/drivers/memory/tegra/tegra30-emc.c
index 1be28e28ec34..d0926088360a 100644
--- a/drivers/memory/tegra/tegra30-emc.c
+++ b/drivers/memory/tegra/tegra30-emc.c
@@ -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@xxxxxxxxx>");
+MODULE_DESCRIPTION("NVIDIA Tegra30 EMC driver");
+MODULE_LICENSE("GPL v2");
--
2.27.0
