[PATCH v5 05/36] memory: tegra30-emc: Make driver modular

[Dmitry Osipenko]

This patch adds modularization support to the Tegra30 EMC driver. Driver
now can be compiled as a loadable kernel module.

Signed-off-by: Dmitry Osipenko <dig...@gmail.com>
---
 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 7e0e1ef87763..bd453de9d446 100644
--- a/drivers/memory/tegra/Kconfig
+++ b/drivers/memory/tegra/Kconfig
@@ -18,7 +18,7 @@ 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 ec8403557ed4..772aa021b5f6 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>
@@ -298,6 +299,7 @@ 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)
 {
@@ -309,6 +311,7 @@ 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 e448a55cb812..f3082964cfb6 100644
--- a/drivers/memory/tegra/tegra30-emc.c
+++ b/drivers/memory/tegra/tegra30-emc.c
@@ -1343,6 +1343,13 @@ 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:
@@ -1393,6 +1400,7 @@ 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,
@@ -1403,9 +1411,8 @@ 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 <dig...@gmail.com>");
+MODULE_DESCRIPTION("NVIDIA Tegra30 EMC driver");
+MODULE_LICENSE("GPL v2");
-- 
2.27.0

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