[PATCH v7 28/47] memory: tegra: Add and use devm_tegra_memory_controller_get()

Dmitry Osipenko
2020-11-04T16:51:33Z

Multiple Tegra drivers need to retrieve Memory Controller and there is
duplication of the retrieval code among the drivers.

Add new devm_tegra_memory_controller_get() helper to remove the code's
duplication and to fix put_device() which was missed in the duplicated
code. Make EMC drivers to use the new helper.

Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/memory/tegra/mc.c | 48 ++++++++++++++++++++++++
drivers/memory/tegra/tegra124-emc.c | 18 ++-------
drivers/memory/tegra/tegra210-emc-core.c | 39 +++++--------------
drivers/memory/tegra/tegra30-emc.c | 18 ++-------
include/soc/tegra/mc.h | 10 +++++
5 files changed, 74 insertions(+), 59 deletions(-)

diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c
index ec8403557ed4..a72cdcafc933 100644
--- a/drivers/memory/tegra/mc.c
+++ b/drivers/memory/tegra/mc.c
@@ -42,6 +42,54 @@ static const struct of_device_id tegra_mc_of_match[] = {
};
MODULE_DEVICE_TABLE(of, tegra_mc_of_match);

+static void tegra_mc_devm_action_put_device(void *data)
+{
+ struct tegra_mc *mc = data;
+
+ put_device(mc->dev);
+}
+
+/**
+ * devm_tegra_memory_controller_get() - get Tegra Memory Controller handle
+ * @dev: device pointer for the consumer device
+ *
+ * This function will search for the Memory Controller node in a device-tree
+ * and retrieve the Memory Controller handle.
+ *
+ * Return: ERR_PTR() on error or a valid pointer to a struct tegra_mc.
+ */
+struct tegra_mc *devm_tegra_memory_controller_get(struct device *dev)
+{
+ struct platform_device *pdev;
+ struct device_node *np;
+ struct tegra_mc *mc;
+ int err;
+
+ np = of_parse_phandle(dev->of_node, "nvidia,memory-controller", 0);
+ if (!np)
+ return ERR_PTR(-ENOENT);
+
+ pdev = of_find_device_by_node(np);
+ of_node_put(np);
+ if (!pdev)
+ return ERR_PTR(-ENODEV);
+
+ mc = platform_get_drvdata(pdev);
+ if (!mc) {
+ put_device(&pdev->dev);
+ return ERR_PTR(-EPROBE_DEFER);
+ }
+
+ err = devm_add_action(dev, tegra_mc_devm_action_put_device, mc);
+ if (err) {
+ put_device(mc->dev);
+ return ERR_PTR(err);
+ }
+
+ return mc;
+}
+EXPORT_SYMBOL_GPL(devm_tegra_memory_controller_get);
+
static int tegra_mc_block_dma_common(struct tegra_mc *mc,
const struct tegra_mc_reset *rst)
{
diff --git a/drivers/memory/tegra/tegra124-emc.c b/drivers/memory/tegra/tegra124-emc.c
index 76ace42a688a..35dbceb7f841 100644
--- a/drivers/memory/tegra/tegra124-emc.c
+++ b/drivers/memory/tegra/tegra124-emc.c
@@ -1177,7 +1177,6 @@ static void emc_debugfs_init(struct device *dev, struct tegra_emc *emc)

static int tegra_emc_probe(struct platform_device *pdev)
{
- struct platform_device *mc;
struct device_node *np;
struct tegra_emc *emc;
struct resource *res;
@@ -1195,20 +1194,9 @@ static int tegra_emc_probe(struct platform_device *pdev)
if (IS_ERR(emc->regs))
return PTR_ERR(emc->regs);

- np = of_parse_phandle(pdev->dev.of_node, "nvidia,memory-controller", 0);
- if (!np) {
- dev_err(&pdev->dev, "could not get memory controller\n");
- return -ENOENT;
- }
-
- mc = of_find_device_by_node(np);
- of_node_put(np);
- if (!mc)
- return -ENOENT;
-
- emc->mc = platform_get_drvdata(mc);
- if (!emc->mc)
- return -EPROBE_DEFER;
+ emc->mc = devm_tegra_memory_controller_get(&pdev->dev);
+ if (IS_ERR(emc->mc))
+ return PTR_ERR(emc->mc);

ram_code = tegra_read_ram_code();

diff --git a/drivers/memory/tegra/tegra210-emc-core.c b/drivers/memory/tegra/tegra210-emc-core.c
index cdd663ba4733..5f224796e32e 100644
--- a/drivers/memory/tegra/tegra210-emc-core.c
+++ b/drivers/memory/tegra/tegra210-emc-core.c
@@ -1828,7 +1828,6 @@ static int tegra210_emc_probe(struct platform_device *pdev)
{
struct thermal_cooling_device *cd;
unsigned long current_rate;
- struct platform_device *mc;
struct tegra210_emc *emc;
struct device_node *np;
unsigned int i;
@@ -1846,35 +1845,19 @@ static int tegra210_emc_probe(struct platform_device *pdev)
spin_lock_init(&emc->lock);
emc->dev = &pdev->dev;

- np = of_parse_phandle(pdev->dev.of_node, "nvidia,memory-controller", 0);
- if (!np) {
- dev_err(&pdev->dev, "could not get memory controller\n");
- return -ENOENT;
- }
-
- mc = of_find_device_by_node(np);
- of_node_put(np);
- if (!mc)
- return -ENOENT;
-
- emc->mc = platform_get_drvdata(mc);
- if (!emc->mc) {
- put_device(&mc->dev);
- return -EPROBE_DEFER;
- }
+ emc->mc = devm_tegra_memory_controller_get(&pdev->dev);
+ if (IS_ERR(emc->mc))
+ return PTR_ERR(emc->mc);

emc->regs = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(emc->regs)) {
- err = PTR_ERR(emc->regs);
- goto put_mc;
- }
+ if (IS_ERR(emc->regs))
+ return PTR_ERR(emc->regs);

for (i = 0; i < 2; i++) {
emc->channel[i] = devm_platform_ioremap_resource(pdev, 1 + i);
- if (IS_ERR(emc->channel[i])) {
- err = PTR_ERR(emc->channel[i]);
- goto put_mc;
- }
+ if (IS_ERR(emc->channel[i]))
+ return PTR_ERR(emc->channel[i]);
+
}

tegra210_emc_detect(emc);
@@ -1884,7 +1867,7 @@ static int tegra210_emc_probe(struct platform_device *pdev)
err = of_reserved_mem_device_init_by_name(emc->dev, np, "nominal");
if (err < 0) {
dev_err(emc->dev, "failed to get nominal EMC table: %d\n", err);
- goto put_mc;
+ return err;
}

err = of_reserved_mem_device_init_by_name(emc->dev, np, "derated");
@@ -2015,8 +1998,7 @@ static int tegra210_emc_probe(struct platform_device *pdev)
tegra210_clk_emc_detach(emc->clk);
release:
of_reserved_mem_device_release(emc->dev);
-put_mc:
- put_device(emc->mc->dev);
+
return err;
}

@@ -2027,7 +2009,6 @@ static int tegra210_emc_remove(struct platform_device *pdev)
debugfs_remove_recursive(emc->debugfs.root);
tegra210_clk_emc_detach(emc->clk);
of_reserved_mem_device_release(emc->dev);
- put_device(emc->mc->dev);

return 0;
}
diff --git a/drivers/memory/tegra/tegra30-emc.c b/drivers/memory/tegra/tegra30-emc.c
index 055af0e08a2e..c58cf31cb27b 100644
--- a/drivers/memory/tegra/tegra30-emc.c
+++ b/drivers/memory/tegra/tegra30-emc.c
@@ -1258,7 +1258,6 @@ static void tegra_emc_debugfs_init(struct tegra_emc *emc)

static int tegra_emc_probe(struct platform_device *pdev)
{
- struct platform_device *mc;
struct device_node *np;
struct tegra_emc *emc;
int err;
@@ -1269,17 +1268,6 @@ static int tegra_emc_probe(struct platform_device *pdev)
return -ENODEV;
}

- np = of_parse_phandle(pdev->dev.of_node, "nvidia,memory-controller", 0);
- if (!np) {
- dev_err(&pdev->dev, "could not get memory controller node\n");
- return -ENOENT;
- }
-
- mc = of_find_device_by_node(np);
- of_node_put(np);
- if (!mc)
- return -ENOENT;
-
np = emc_find_node_by_ram_code(&pdev->dev);
if (!np)
return -EINVAL;
@@ -1290,9 +1278,9 @@ static int tegra_emc_probe(struct platform_device *pdev)
return -ENOMEM;
}

- emc->mc = platform_get_drvdata(mc);
- if (!emc->mc)
- return -EPROBE_DEFER;
+ emc->mc = devm_tegra_memory_controller_get(&pdev->dev);
+ if (IS_ERR(emc->mc))
+ return PTR_ERR(emc->mc);

emc->clk_nb.notifier_call = emc_clk_change_notify;
emc->dev = &pdev->dev;
diff --git a/include/soc/tegra/mc.h b/include/soc/tegra/mc.h
index 1238e35653d1..d9395af98143 100644
--- a/include/soc/tegra/mc.h
+++ b/include/soc/tegra/mc.h
@@ -184,4 +184,14 @@ struct tegra_mc {
int tegra_mc_write_emem_configuration(struct tegra_mc *mc, unsigned long rate);
unsigned int tegra_mc_get_emem_device_count(struct tegra_mc *mc);

+#ifdef CONFIG_TEGRA_MC
+struct tegra_mc *devm_tegra_memory_controller_get(struct device *dev);
+#else
+static inline struct tegra_mc *
+devm_tegra_memory_controller_get(struct device *dev)
+{
+ ERR_PTR(-ENODEV);
+}
+#endif
+
#endif /* __SOC_TEGRA_MC_H__ */
--
2.27.0