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 digetx@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 055af0e08a2e..85d4effb8e6f 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 digetx@gmail.com"); +MODULE_DESCRIPTION("NVIDIA Tegra30 EMC driver"); +MODULE_LICENSE("GPL v2");